[Fix] (DirectVulkan, MG_State): make a shader-written storage buffer readable on Magma

Reading a buffer a compute shader wrote gave zeros: the frontend shadow that MapBuffer
resolves against is only maintained by uploads, and Magma had no path back. Every
KHR-GL40.texture_gather case ends by dispatching a compute shader into an SSBO and
comparing the mapped result, so 66 of 75 failed on it.

Magma needs no readback: EnsureGpuResidentStorage - the same host-visible coherent
adoption the transform feedback capture already uses - makes the shadow BE the memory
the shader writes, so binding a buffer as a shader storage buffer now adopts it. What
coherence does not give is ordering: the writes are visible once they have happened,
and the CPU was reading before the dispatch had retired. The readback op therefore
submits the recorded work and waits.

That exposed a mistake in the frontend flag this rides on: MarkGpuWritten skipped
GPU-resident buffers, reasoning there was no shadow to refresh. True, but the wait is
still needed - "reconcile with the GPU write" is not always "copy it back", and which
of the two it is belongs to the backend. The flag now only says a write is outstanding;
DirectGLES's readback still skips its persistent-mapped buffers when copying.

KHR-GL40.texture_gather on Magma: 66 failures -> 19 (the rest are rectangle textures,
mipmap completeness and tessellation, all still to do). Espryt stays at 75/75.

MobileGL/MG_Backend/BackendObject.h

@@ -234,8 +234,17 @@ namespace MobileGL {
             // drives capture from its draw recording instead (DirectVulkan). End is
             // called while the frontend capture state is still active, so the backend
             // can still see the capture program and buffer bindings.
+            // GL_PATCH_VERTICES; ES 3.2 spells it the same way.
+            void (*PatchParameteri)(GLenum pname, GLint value);
             void (*BeginTransformFeedback)(GLenum primitiveMode);
             void (*EndTransformFeedback)();
+            // ARB_transform_feedback2. A backend that leaves these null keeps the single
+            // implicit capture span the frontend has always modelled; the frontend state
+            // (paused flag, per-object bindings) is tracked either way.
+            void (*PauseTransformFeedback)();
+            void (*ResumeTransformFeedback)();
+            void (*BindTransformFeedback)(GLuint name);
+            void (*DeleteTransformFeedback)(GLuint name);
             Int64 (*GetGpuTimestampNs)(); // glGetInteger64v(GL_TIMESTAMP); 0 if unsupported
         };
         struct GlobalBackendFunctionsTable {
@@ -288,6 +297,13 @@ namespace MobileGL {
             Int MaxIntegerSamples = 1;
             Int MaxSamples = 1;
             Int MaxSampleMaskWords = 1;
+            // Tessellation limits; defaults are the GL 4.0 core minimums.
+            Int MaxPatchVertices = 32;
+            Int MaxTessGenLevel = 64;
+            // GL_MIN/MAX_PROGRAM_TEXTURE_GATHER_OFFSET. Defaults are the GL 4.0 core
+            // minimums, which every ES 3.1 driver also guarantees.
+            Int MinProgramTextureGatherOffset = -8;
+            Int MaxProgramTextureGatherOffset = 7;
             Int MaxTextureImageUnits = 32;
             Int MaxVertexTextureImageUnits = 32;
             Int MaxComputeTextureImageUnits = 32;

MobileGL/MG_Backend/DirectGLES/BackendObject_DirectGLES.cpp

@@ -910,7 +910,11 @@ namespace MobileGL::MG_Backend::DirectGLES {
                                           // picks a whole different shader for draw_buffers without
                                           // explicit_attrib_location. DirectVulkan advertises both.
                                           E_GL_ARB_explicit_attrib_location, E_GL_ARB_texture_multisample,
-                                          E_GL_ARB_shader_image_size};
+                                          E_GL_ARB_shader_image_size,
+                                          // Advertised with GL_NUM_PROGRAM_BINARY_FORMATS = 0, which the
+                                          // extension explicitly permits. It is also the only thing that
+                                          // exposes glProgramParameteri before GL 4.1.
+                                          E_GL_ARB_get_program_binary};
         // Only advertised when the device driver actually has usable timer queries
         // (GL_EXT_disjoint_timer_query plus its entry points) and the
         // MOBILEGL_DISABLE_TIMERQUERY escape hatch is off.
@@ -1030,8 +1034,13 @@ namespace MobileGL::MG_Backend::DirectGLES {
             // Transform feedback is captured by the real ES driver rather than
             // reconstructed from the draw recording, so the frontend has to hand the
             // span boundaries over.
+            funcsTable.GL.PatchParameteri = DirectGLES::PatchParameteri;
             funcsTable.GL.BeginTransformFeedback = XfbImpl::BeginTransformFeedback;
             funcsTable.GL.EndTransformFeedback = XfbImpl::EndTransformFeedback;
+            funcsTable.GL.PauseTransformFeedback = XfbImpl::PauseTransformFeedback;
+            funcsTable.GL.ResumeTransformFeedback = XfbImpl::ResumeTransformFeedback;
+            funcsTable.GL.BindTransformFeedback = XfbImpl::BindTransformFeedback;
+            funcsTable.GL.DeleteTransformFeedback = XfbImpl::DeleteTransformFeedback;
             funcsTableInitialized = true;
         }
         return funcsTable;
@@ -1072,6 +1081,10 @@ namespace MobileGL::MG_Backend::DirectGLES {
         m_dynamicParameters.MaxIntegerSamples = m_GLESCapabilities.MaxIntegerSamples;
         m_dynamicParameters.MaxSamples = m_GLESCapabilities.MaxSamples;
         m_dynamicParameters.MaxSampleMaskWords = m_GLESCapabilities.MaxSampleMaskWords;
+        m_dynamicParameters.MaxPatchVertices = m_GLESCapabilities.MaxPatchVertices;
+        m_dynamicParameters.MaxTessGenLevel = m_GLESCapabilities.MaxTessGenLevel;
+        m_dynamicParameters.MinProgramTextureGatherOffset = m_GLESCapabilities.MinProgramTextureGatherOffset;
+        m_dynamicParameters.MaxProgramTextureGatherOffset = m_GLESCapabilities.MaxProgramTextureGatherOffset;
         // Clamp the advertised sampler limits the same way the DirectVulkan backend does: per-stage
         // GL_MAX_TEXTURE_IMAGE_UNITS must never exceed host-side fixed arrays sized off it (e.g.
         // Minecraft's 128-entry Blaze3D GlStateManager.TEXTURES[], iterated by Iris), and the combined

MobileGL/MG_Backend/DirectGLES/DirectGLES.cpp

@@ -295,6 +295,20 @@ namespace MobileGL::MG_Backend::DirectGLES {
             }
         }
 
+        // Called once the storage-buffer points are bound and the draw/dispatch is about to
+        // go out: whatever the shader writes there lands in the ES driver's buffers, behind
+        // the frontend's CPU shadow. Flagging them makes the next MapBuffer/GetBufferSubData
+        // pull the real contents back (BufferObject::SyncGpuWrites).
+        void MarkShaderStorageBuffersGpuWritten() {
+            const SizeT bindingPointCnt =
+                MG_State::pGLContext->GetTouchedBufferBindingPointCount(BufferTarget::ShaderStorage);
+            for (SizeT i = 0; i < bindingPointCnt; ++i) {
+                const auto& obj =
+                    MG_State::pGLContext->GetBufferBindingPoint(BufferTarget::ShaderStorage, i).GetBoundObject();
+                if (obj) obj->MarkGpuWritten();
+            }
+        }
+
         void SyncBoundBuffer(BufferTarget target, GLenum glTarget) {
 #ifdef TRACY_ENABLE
             ZoneScopedC(TRACY_ZONECOLOR_BACKEND);
@@ -367,6 +381,7 @@ namespace MobileGL::MG_Backend::DirectGLES {
             // BindCurrentProgramWithResources binds no SSBO points, so this is their sole draw-path
             // binder (e.g. Flywheel's indirect vertex shaders pull instance data from storage buffers).
             SyncBufferBindingPoints(BufferTarget::ShaderStorage, GL_SHADER_STORAGE_BUFFER);
+            MarkShaderStorageBuffersGpuWritten();
         }
 
         void SyncComputeBuffers(Bool includeDispatchIndirectBuffer) {
@@ -376,6 +391,7 @@ namespace MobileGL::MG_Backend::DirectGLES {
             ProcessDeferredBufferReleases();
             SyncBufferBindingPoints(BufferTarget::Uniform, GL_UNIFORM_BUFFER);
             SyncBufferBindingPoints(BufferTarget::ShaderStorage, GL_SHADER_STORAGE_BUFFER);
+            MarkShaderStorageBuffersGpuWritten();
             if (includeDispatchIndirectBuffer) {
                 SyncBoundBuffer(BufferTarget::DispatchIndirect, GL_DISPATCH_INDIRECT_BUFFER);
             }
@@ -391,6 +407,11 @@ namespace MobileGL::MG_Backend::DirectGLES {
     // the capture buffers bound when Begin is issued, and both of those only become true
     // once PrepareForDraw has run. A span that never draws therefore never touches the
     // driver at all, which is also what the GL semantics amount to.
+    //
+    // Transform feedback objects (ARB_transform_feedback2) are ES 3.0 core, so each
+    // frontend object gets one of the driver's: a paused span lives inside the ES object,
+    // which is the only way several of them can be paused at once - and the only reason
+    // the default object alone would not do.
     namespace XfbImpl {
         namespace {
             struct XfbCaptureTarget {
@@ -400,10 +421,161 @@ namespace MobileGL::MG_Backend::DirectGLES {
                 SizeT end = 0;
             };
 
-            Bool g_xfbPending = false; // frontend Begin seen, driver capture not started yet
-            Bool g_xfbStarted = false; // driver capture running
-            GLenum g_xfbPrimitiveMode = GL_POINTS;
-            Vector<XfbCaptureTarget> g_xfbTargets;
+            // Per frontend transform feedback object. The default object (name 0) maps to
+            // the driver's default object (id 0) and is always present.
+            struct XfbObjectState {
+                GLuint esId = 0;
+                Bool pending = false; // frontend Begin seen, driver capture not started yet
+                Bool started = false; // driver capture running
+                Bool paused = false;  // frontend Pause seen and not yet resumed
+                GLenum primitiveMode = GL_POINTS;
+                Vector<XfbCaptureTarget> targets;
+                // Set for a layout ES cannot express (gl_SkipComponents / gl_NextBuffer):
+                // the driver captures gap-free records into the scratch buffer below and
+                // End scatters them into `targets`.
+                Bool scattered = false;
+                SharedPtr<MG_State::GLState::ProgramObject> scatterProgram;
+                SizeT scatterCapacityVertices = 0;
+            };
+
+            // One scratch ES buffer serves every scattered capture: only one span can be
+            // recording at a time (the driver would reject a second Begin), so its contents
+            // are consumed by the End that follows.
+            GLuint g_scatterBufferId = 0;
+            SizeT g_scatterBufferSize = 0;
+
+            UnorderedMap<GLuint, XfbObjectState> g_xfbObjects;
+            GLuint g_currentXfbName = 0;
+
+            XfbObjectState& CurrentXfb() {
+                return g_xfbObjects[g_currentXfbName];
+            }
+
+            Bool AreTransformFeedbackObjectsSupported() {
+                return g_GLESFuncs.glGenTransformFeedbacks != nullptr &&
+                       g_GLESFuncs.glBindTransformFeedback != nullptr &&
+                       g_GLESFuncs.glDeleteTransformFeedbacks != nullptr &&
+                       g_GLESFuncs.glPauseTransformFeedback != nullptr &&
+                       g_GLESFuncs.glResumeTransformFeedback != nullptr;
+            }
+
+            // Mirrors one capture span's results into the frontend CPU shadows. The GPU wrote
+            // the capture buffers behind the frontend's back, so the shadows that back
+            // MapBuffer/GetBufferSubData still hold the pre-draw bytes. Buffers whose storage
+            // the backend already owns (coherent persistent map) need nothing: reads resolve
+            // against that storage directly.
+            void ReadbackCapturedRanges(Vector<XfbCaptureTarget>& targets) {
+                if (g_GLESFuncs.glMapBufferRange != nullptr && g_GLESFuncs.glUnmapBuffer != nullptr) {
+                    for (const auto& target : targets) {
+                        if (!target.buffer || target.buffer->IsBackendPersistentMapped()) continue;
+                        const SizeT size = target.end - target.start;
+                        BufferImpl::BindBufferId(BufferImpl::TempBufferTarget, target.backendId);
+                        void* mapped = g_GLESFuncs.glMapBufferRange(BufferImpl::TempBufferTarget,
+                                                                    static_cast<GLintptr>(target.start),
+                                                                    static_cast<GLsizeiptr>(size), GL_MAP_READ_BIT);
+                        if (mapped == nullptr) {
+                            MGLOG_E("EndTransformFeedback: failed to map backend buffer %u for capture readback",
+                                    target.backendId);
+                            continue;
+                        }
+                        target.buffer->WritebackFromBackend({mapped, size}, target.start);
+                        g_GLESFuncs.glUnmapBuffer(BufferImpl::TempBufferTarget);
+                    }
+                }
+                targets.clear();
+            }
+
+            // Binds a scratch buffer, sized for `capacityVertices` gap-free records, to
+            // capture point 0 in place of the application's buffers. Returns false when the
+            // scratch storage cannot be provided, in which case the caller falls back to the
+            // direct binding (which produces a wrong layout, but is what happened before).
+            Bool BindScatterCaptureBuffer(SizeT packedStride, SizeT capacityVertices) {
+                if (packedStride == 0 || capacityVertices == 0) return false;
+                if (g_GLESFuncs.glGenBuffers == nullptr || g_GLESFuncs.glBufferData == nullptr) return false;
+                const SizeT required = packedStride * capacityVertices;
+                if (g_scatterBufferId == 0) {
+                    g_GLESFuncs.glGenBuffers(1, &g_scatterBufferId);
+                    if (g_scatterBufferId == 0) return false;
+                    g_scatterBufferSize = 0;
+                }
+                if (g_scatterBufferSize < required) {
+                    BufferImpl::BindBufferId(BufferImpl::TempBufferTarget, g_scatterBufferId);
+                    g_GLESFuncs.glBufferData(BufferImpl::TempBufferTarget, static_cast<GLsizeiptr>(required), nullptr,
+                                             GL_DYNAMIC_COPY);
+                    g_scatterBufferSize = required;
+                }
+                // Point 0 carries every captured varying (the ES capture is INTERLEAVED); the
+                // other points must be cleared or the driver would still write the app's buffers.
+                BufferImpl::BindBufferRangeCached(GL_TRANSFORM_FEEDBACK_BUFFER, 0, g_scatterBufferId, 0,
+                                                  static_cast<GLsizeiptr>(required));
+                const SizeT pointCount =
+                    MG_State::pGLContext->GetTouchedBufferBindingPointCount(BufferTarget::TransformFeedback);
+                for (SizeT i = 1; i < pointCount; ++i) {
+                    BufferImpl::BindBufferBaseCached(GL_TRANSFORM_FEEDBACK_BUFFER, static_cast<Uint>(i), 0);
+                }
+                return true;
+            }
+
+            // Distributes the gap-free records the driver captured into the application's
+            // buffers at the offsets the GL layout asks for. Only the bytes a varying actually
+            // occupies are written, so the holes gl_SkipComponents asks for keep whatever the
+            // application had put there - which is the whole point of the feature.
+            void ScatterCapturedRecords(XfbObjectState& xfb) {
+                const auto& program = xfb.scatterProgram;
+                if (!program || xfb.targets.empty()) return;
+                if (g_GLESFuncs.glMapBufferRange == nullptr || g_GLESFuncs.glUnmapBuffer == nullptr) return;
+
+                const SizeT packedStride = program->GetTransformFeedbackPackedStride();
+                const SizeT vertices = std::min<SizeT>(
+                    static_cast<SizeT>(MG_State::pGLContext->GetTransformFeedbackCapturedVertices()),
+                    xfb.scatterCapacityVertices);
+                if (packedStride == 0 || vertices == 0) return;
+
+                BufferImpl::BindBufferId(BufferImpl::TempBufferTarget, g_scatterBufferId);
+                const void* packed = g_GLESFuncs.glMapBufferRange(BufferImpl::TempBufferTarget, 0,
+                                                                  static_cast<GLsizeiptr>(packedStride * vertices),
+                                                                  GL_MAP_READ_BIT);
+                if (packed == nullptr) {
+                    MGLOG_E("EndTransformFeedback: failed to map the scatter capture buffer");
+                    return;
+                }
+
+                // One staged copy per destination buffer: start from what the application had
+                // (the shadow is authoritative - uploads go shadow -> ES, and previous captures
+                // were mirrored back into it), patch the captured varyings in, then push the
+                // whole range down once.
+                for (SizeT targetIndex = 0; targetIndex < xfb.targets.size(); ++targetIndex) {
+                    const auto& target = xfb.targets[targetIndex];
+                    if (!target.buffer) continue;
+                    const SizeT stride = program->GetTransformFeedbackStride(static_cast<Uint32>(targetIndex));
+                    if (stride == 0) continue;
+                    const SizeT rangeBytes = target.end - target.start;
+                    Vector<Uint8> staged(rangeBytes);
+                    Memcpy(staged.data(), target.buffer->MappedData() + target.start, rangeBytes);
+
+                    for (const auto& varying : program->GetTransformFeedbackVaryings()) {
+                        if (varying.bufferIndex != targetIndex) continue;
+                        for (SizeT v = 0; v < vertices; ++v) {
+                            const SizeT dstOffset = v * stride + varying.offsetBytes;
+                            if (dstOffset + varying.byteSize > rangeBytes) break;
+                            Memcpy(staged.data() + dstOffset,
+                                   static_cast<const Uint8*>(packed) + v * packedStride + varying.packedOffsetBytes,
+                                   varying.byteSize);
+                        }
+                    }
+
+                    target.buffer->WritebackFromBackend({staged.data(), rangeBytes}, target.start);
+                    if (g_GLESFuncs.glBufferSubData != nullptr) {
+                        BufferImpl::BindBufferId(BufferImpl::TempBufferTarget, target.backendId);
+                        g_GLESFuncs.glBufferSubData(BufferImpl::TempBufferTarget,
+                                                    static_cast<GLintptr>(target.start),
+                                                    static_cast<GLsizeiptr>(rangeBytes), staged.data());
+                    }
+                    BufferImpl::BindBufferId(BufferImpl::TempBufferTarget, g_scatterBufferId);
+                }
+                g_GLESFuncs.glUnmapBuffer(BufferImpl::TempBufferTarget);
+                xfb.targets.clear();
+            }
         } // namespace
 
         Bool AreTransformFeedbacksSupported() {
@@ -414,17 +586,23 @@ namespace MobileGL::MG_Backend::DirectGLES {
 
         void BeginTransformFeedback(GLenum primitiveMode) {
             if (!AreTransformFeedbacksSupported()) return;
-            g_xfbPrimitiveMode = primitiveMode;
-            g_xfbPending = true;
-            g_xfbStarted = false;
-            g_xfbTargets.clear();
+            auto& xfb = CurrentXfb();
+            xfb.primitiveMode = primitiveMode;
+            xfb.pending = true;
+            xfb.started = false;
+            xfb.paused = false;
+            xfb.targets.clear();
         }
 
         // Tail of PrepareForDraw: the program is bound and every buffer the draw needs
         // is up to date, so the capture buffers can be bound and the span opened.
         void StartPendingTransformFeedback() {
-            if (!g_xfbPending) return;
-            g_xfbPending = false;
+            auto& xfb = CurrentXfb();
+            // A span that was paused before its first draw must not open here: the draw is
+            // not captured, and opening the span would also subject it to the capture
+            // primitive-mode rule the paused draw is exempt from.
+            if (!xfb.pending || xfb.paused) return;
+            xfb.pending = false;
             const auto& program = MG_State::pGLContext->GetTransformFeedbackProgram();
             if (!program) return;
 
@@ -443,51 +621,103 @@ namespace MobileGL::MG_Backend::DirectGLES {
                 const SizeT start = std::min(range.start, bufferObject->GetSize());
                 const SizeT end = std::min(range.end, bufferObject->GetSize());
                 if (end <= start) continue;
-                g_xfbTargets.push_back({bufferObject, backendResource->id, start, end});
+                xfb.targets.push_back({bufferObject, backendResource->id, start, end});
             }
 
             BufferImpl::SyncBufferBindingPoints(BufferTarget::TransformFeedback, GL_TRANSFORM_FEEDBACK_BUFFER);
-            g_GLESFuncs.glBeginTransformFeedback(g_xfbPrimitiveMode);
-            g_xfbStarted = true;
+
+            // A layout with holes or several interleaved buffers is not expressible on ES:
+            // capture gap-free into scratch storage and place the records at End instead.
+            xfb.scattered = false;
+            xfb.scatterProgram.reset();
+            xfb.scatterCapacityVertices = 0;
+            if (program->NeedsScatteredTransformFeedbackCapture()) {
+                SizeT capacityVertices = ~SizeT(0);
+                for (SizeT i = 0; i < xfb.targets.size(); ++i) {
+                    const SizeT stride = program->GetTransformFeedbackStride(static_cast<Uint32>(i));
+                    if (stride == 0) continue;
+                    capacityVertices =
+                        std::min<SizeT>(capacityVertices, (xfb.targets[i].end - xfb.targets[i].start) / stride);
+                }
+                if (capacityVertices == ~SizeT(0)) capacityVertices = 0;
+                if (BindScatterCaptureBuffer(program->GetTransformFeedbackPackedStride(), capacityVertices)) {
+                    xfb.scattered = true;
+                    xfb.scatterProgram = program;
+                    xfb.scatterCapacityVertices = capacityVertices;
+                }
+            }
+
+            g_GLESFuncs.glBeginTransformFeedback(xfb.primitiveMode);
+            xfb.started = true;
         }
 
         void EndTransformFeedback() {
-            g_xfbPending = false;
-            if (!g_xfbStarted) return;
-            g_xfbStarted = false;
+            auto& xfb = CurrentXfb();
+            xfb.pending = false;
+            xfb.paused = false;
+            if (!xfb.started) return;
+            xfb.started = false;
             g_GLESFuncs.glEndTransformFeedback();
-
-            // The GPU wrote the capture buffers behind the frontend's back, so the CPU
-            // shadows that back MapBuffer/GetBufferSubData still hold the pre-draw bytes.
-            // Mirror the captured ranges into them. Buffers whose storage the backend
-            // already owns (coherent persistent map) need nothing: reads resolve against
-            // that storage directly.
-            if (g_GLESFuncs.glMapBufferRange != nullptr && g_GLESFuncs.glUnmapBuffer != nullptr) {
-                for (const auto& target : g_xfbTargets) {
-                    if (!target.buffer || target.buffer->IsBackendPersistentMapped()) continue;
-                    const SizeT size = target.end - target.start;
-                    BufferImpl::BindBufferId(BufferImpl::TempBufferTarget, target.backendId);
-                    void* mapped = g_GLESFuncs.glMapBufferRange(BufferImpl::TempBufferTarget,
-                                                                static_cast<GLintptr>(target.start),
-                                                                static_cast<GLsizeiptr>(size), GL_MAP_READ_BIT);
-                    if (mapped == nullptr) {
-                        MGLOG_E("EndTransformFeedback: failed to map backend buffer %u for capture readback",
-                                target.backendId);
-                        continue;
-                    }
-                    target.buffer->WritebackFromBackend({mapped, size}, target.start);
-                    g_GLESFuncs.glUnmapBuffer(BufferImpl::TempBufferTarget);
-                }
+            if (xfb.scattered) {
+                ScatterCapturedRecords(xfb);
+                xfb.scattered = false;
+                xfb.scatterProgram.reset();
+            } else {
+                ReadbackCapturedRanges(xfb.targets);
             }
-            g_xfbTargets.clear();
         }
 
-        // The ES context went away (or is being torn down): the span, its buffer ids and
-        // the frontend objects it pinned all belonged to it.
+        void PauseTransformFeedback() {
+            auto& xfb = CurrentXfb();
+            xfb.paused = true;
+            // A span the driver never opened (paused before the first draw) has nothing to
+            // pause; the flag above is what holds the deferred Begin back until the resume.
+            if (!xfb.started || g_GLESFuncs.glPauseTransformFeedback == nullptr) return;
+            g_GLESFuncs.glPauseTransformFeedback();
+        }
+
+        void ResumeTransformFeedback() {
+            auto& xfb = CurrentXfb();
+            xfb.paused = false;
+            if (!xfb.started || g_GLESFuncs.glResumeTransformFeedback == nullptr) return;
+            g_GLESFuncs.glResumeTransformFeedback();
+        }
+
+        void BindTransformFeedback(GLuint name) {
+            if (!AreTransformFeedbackObjectsSupported()) {
+                // Without driver objects there is only the default span; keep the frontend
+                // name so the bookkeeping below stays consistent.
+                g_currentXfbName = name;
+                return;
+            }
+            auto& xfb = g_xfbObjects[name];
+            if (name != 0 && xfb.esId == 0) {
+                g_GLESFuncs.glGenTransformFeedbacks(1, &xfb.esId);
+            }
+            g_GLESFuncs.glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, xfb.esId);
+            g_currentXfbName = name;
+        }
+
+        void DeleteTransformFeedback(GLuint name) {
+            const auto it = g_xfbObjects.find(name);
+            if (it == g_xfbObjects.end()) return;
+            if (it->second.esId != 0 && g_GLESFuncs.glDeleteTransformFeedbacks != nullptr) {
+                g_GLESFuncs.glDeleteTransformFeedbacks(1, &it->second.esId);
+            }
+            g_xfbObjects.erase(it);
+            // The frontend reverts to the default object when the bound one is deleted.
+            if (g_currentXfbName == name) {
+                BindTransformFeedback(0);
+            }
+        }
+
+        // The ES context went away (or is being torn down): the spans, their buffer ids, the
+        // driver objects and the frontend objects they pinned all belonged to it.
         void OnBackendContextDestroyed() {
-            g_xfbPending = false;
-            g_xfbStarted = false;
-            g_xfbTargets.clear();
+            g_xfbObjects.clear();
+            g_currentXfbName = 0;
+            g_scatterBufferId = 0;
+            g_scatterBufferSize = 0;
         }
     } // namespace XfbImpl
 
@@ -1383,6 +1613,20 @@ namespace MobileGL::MG_Backend::DirectGLES {
                     }
                     const GLenum targetGL = TextureImpl::ConvertTextureTargetToBackendGLEnum(target);
 
+                    // A texture whose mip chain does not satisfy the filter's completeness
+                    // rules samples as (0, 0, 0, 1). The ES driver cannot work that out for
+                    // itself here: the backend texture is immutable storage, so a level the
+                    // application redefined at the wrong size never reached it. Leaving the
+                    // native target unbound produces exactly the incomplete-texture result.
+                    const auto& effectiveSampler = textureUnit.GetSamplerObject()
+                        ? textureUnit.GetSamplerObject()
+                        : textureObject->GetSamplerObject();
+                    const Bool mipmappedFilter =
+                        effectiveSampler && effectiveSampler->GetMipmapMode() != SamplerMipmapMode::None;
+                    if (!MG_State::GLState::IsMipmapCompleteForFilter(textureObject.get(), mipmappedFilter)) {
+                        continue;
+                    }
+
                     // Bind texture object
                     const auto& backendTextureIt = TextureImpl::g_backendTextureObjects.find(textureObject.get());
                     if (backendTextureIt == TextureImpl::g_backendTextureObjects.end()) continue;
@@ -3709,6 +3953,83 @@ namespace MobileGL::MG_Backend::DirectGLES {
         }
     }
 
+    // ES has no colour-renderable three-channel float format, and its glGenerateMipmap
+    // requires one, so it rejects GL_RGB16F and GL_RGB32F outright where every desktop
+    // driver accepts them. Both store a plain array of floats, and a format the driver
+    // cannot render into is a format nothing can have rendered into - so the frontend's own
+    // copy of the texels is the authority, and the chain can be filtered there and carried
+    // down by the ordinary upload path. Returns false for anything else, leaving the
+    // driver's answer (including its error) in place.
+    static Bool GenerateThreeChannelFloatMipmapOnCpu(
+        const SharedPtr<MG_State::GLState::ITextureObject>& texture) {
+        if (!texture) return false;
+        const TextureInternalFormat format = texture->GetFormat();
+        const Bool isHalf = format == TextureInternalFormat::RGB16F;
+        if (!isHalf && format != TextureInternalFormat::RGB32F) return false;
+
+        auto* mipmapTexture = MG_State::GLState::AsMipmapTexture(texture.get());
+        if (mipmapTexture == nullptr) return false;
+        const Uint levelCount = mipmapTexture->GetMipmapLevelCount();
+        constexpr Int kChannels = 3;
+
+        for (const auto uploadTarget : texture->GetUploadTargets()) {
+            for (Uint level = 1; level < levelCount; ++level) {
+                const IntVec3 srcSize = mipmapTexture->GetMipmapTexelSize(uploadTarget, level - 1);
+                const IntVec3 dstSize = mipmapTexture->GetMipmapTexelSize(uploadTarget, level);
+                if (srcSize.x() <= 0 || srcSize.y() <= 0 || dstSize.x() <= 0 || dstSize.y() <= 0) return false;
+                auto* src = static_cast<Uint8*>(mipmapTexture->MapMipmapData(uploadTarget, level - 1));
+                auto* dst = static_cast<Uint8*>(mipmapTexture->MapMipmapData(uploadTarget, level));
+                if (src == nullptr || dst == nullptr) return false;
+
+                const SizeT componentBytes = isHalf ? sizeof(Uint16) : sizeof(Float);
+                const SizeT texelBytes = componentBytes * kChannels;
+                const auto load = [&](const Uint8* base, Int x, Int y, Int channel) {
+                    const Uint8* texel = base + (static_cast<SizeT>(y) * srcSize.x() + x) * texelBytes +
+                                         channel * componentBytes;
+                    if (isHalf) {
+                        Uint16 bits = 0;
+                        Memcpy(&bits, texel, sizeof(bits));
+                        return MG_Util::DecodeHalfBitsToFloat(bits);
+                    }
+                    Float value = 0.0f;
+                    Memcpy(&value, texel, sizeof(value));
+                    return value;
+                };
+
+                // Box filter over the 2x2 source footprint, clamped where a dimension is
+                // already 1 (GL 4.6 core 8.14.4 leaves the exact filter to the implementation
+                // and this is the one it describes for power-of-two levels).
+                for (Int y = 0; y < dstSize.y(); ++y) {
+                    for (Int x = 0; x < dstSize.x(); ++x) {
+                        const Int x0 = std::min(x * 2, srcSize.x() - 1);
+                        const Int x1 = std::min(x * 2 + 1, srcSize.x() - 1);
+                        const Int y0 = std::min(y * 2, srcSize.y() - 1);
+                        const Int y1 = std::min(y * 2 + 1, srcSize.y() - 1);
+                        for (Int channel = 0; channel < kChannels; ++channel) {
+                            const Float average = 0.25f * (load(src, x0, y0, channel) + load(src, x1, y0, channel) +
+                                                           load(src, x0, y1, channel) + load(src, x1, y1, channel));
+                            Uint8* texel = dst + (static_cast<SizeT>(y) * dstSize.x() + x) * texelBytes +
+                                           channel * componentBytes;
+                            if (isHalf) {
+                                const Uint16 bits = MG_Util::EncodeFloatToHalfBits(average);
+                                Memcpy(texel, &bits, sizeof(bits));
+                            } else {
+                                Memcpy(texel, &average, sizeof(average));
+                            }
+                        }
+                    }
+                }
+                mipmapTexture->MarkStorageDirty(uploadTarget, level, true);
+            }
+        }
+        return true;
+    }
+
+    void PatchParameteri(GLenum pname, GLint value) {
+        if (g_GLESFuncs.glPatchParameteri == nullptr) return;
+        g_GLESFuncs.glPatchParameteri(pname, value);
+    }
+
     void GenerateMipmap(GLenum target) {
 #if MOBILEGL_LOG_ACTIVE_LEVEL <= MOBILEGL_LOG_LEVEL_DEBUG && MOBILEGL_ENABLE_SCOPE_MARKER
         DebugImpl::OpenGLScopeMarker marker(__func__);
@@ -3718,9 +4039,16 @@ namespace MobileGL::MG_Backend::DirectGLES {
         auto& slot = unit.GetBindingSlot(MG_Util::ConvertGLEnumToTextureTarget(target));
         auto& texture = slot.GetBoundObject();
         MOBILEGL_ASSERT(texture != nullptr, "GenerateMipmap requires a bound texture.");
-        if (texture->GetFormat() == TextureInternalFormat::R11FG11FB10F || IsDepthOnlyFormat(texture->GetFormat())) {
+        if (texture->GetFormat() == TextureInternalFormat::R11FG11FB10F || IsDepthOnlyFormat(texture->GetFormat()) ||
+            texture->GetFormat() == TextureInternalFormat::RGB16F ||
+            texture->GetFormat() == TextureInternalFormat::RGB32F) {
             EnsureGenerateMipmapStorageAllocated(texture);
         }
+        // Filtered on the CPU before the backend sync, so the dirty levels ride down with it.
+        if (GenerateThreeChannelFloatMipmapOnCpu(texture)) {
+            TextureImpl::SyncTextureObjectToBackend(texture);
+            return;
+        }
         auto& backendTexture = TextureImpl::SyncTextureObjectToBackend(texture);
 
         if (IsDepthOnlyFormat(texture->GetFormat())) {

MobileGL/MG_Backend/DirectGLES/DirectGLES.h

@@ -169,10 +169,16 @@ namespace MobileGL::MG_Backend::DirectGLES {
     // begin is deferred to the first draw of the span (ES needs the capturing
     // program current and the capture buffers bound), and the end also mirrors the
     // captured bytes back into the frontend buffer shadows.
+    void PatchParameteri(GLenum pname, GLint value);
+
     namespace XfbImpl {
         Bool AreTransformFeedbacksSupported();
         void BeginTransformFeedback(GLenum primitiveMode);
         void EndTransformFeedback();
+        void PauseTransformFeedback();
+        void ResumeTransformFeedback();
+        void BindTransformFeedback(GLuint name);
+        void DeleteTransformFeedback(GLuint name);
         void OnBackendContextDestroyed();
     } // namespace XfbImpl
 

MobileGL/MG_Backend/DirectGLES/Managers.cpp

@@ -630,6 +630,32 @@ namespace MobileGL::MG_Backend::DirectGLES {
                 resource->syncedChangeSerial = bufferObject.GetChangeSerial();
             }
 
+            // A shader wrote this buffer through a storage/atomic-counter binding, so the ES
+            // driver's copy is ahead of the frontend shadow. Pull the whole thing back so
+            // MapBuffer/GetBufferSubData/CopyBufferSubData see the real results.
+            void Ops_ReadbackFromGpu(BufferObject& bufferObject) {
+                auto* resource = ResourceOf(bufferObject);
+                if (!resource || resource->id == 0 || !resource->storageInitialized) return;
+                if (resource->persistentMapped) return; // shadow already IS the GPU storage
+                if (!CanTouchGLNow() || resource->contextGeneration != g_bufferContextGeneration) return;
+                if (!g_GLESFuncs.glMapBufferRange || !g_GLESFuncs.glUnmapBuffer) return;
+                const SizeT size = std::min<SizeT>(bufferObject.GetSize(), resource->storageSize);
+                if (size == 0) return;
+
+                BindBufferId(TempBufferTarget, resource->id);
+                void* mapped = g_GLESFuncs.glMapBufferRange(TempBufferTarget, 0, static_cast<GLsizeiptr>(size),
+                                                            GL_MAP_READ_BIT);
+                if (mapped == nullptr) {
+                    MGLOG_E("Ops_ReadbackFromGpu: glMapBufferRange(read) failed for buffer %u", resource->id);
+                    return;
+                }
+                bufferObject.WritebackFromBackend({mapped, size}, 0);
+                g_GLESFuncs.glUnmapBuffer(TempBufferTarget);
+                // The shadow now matches the backend byte for byte; without this the next
+                // draw would see a newer change serial and re-upload the readback over it.
+                resource->syncedChangeSerial = bufferObject.GetChangeSerial();
+            }
+
             void Ops_OnDestroy(SharedPtr<BackendBufferResource>&& resource) {
                 if (!resource) return;
                 auto* glesResource = static_cast<GLESBufferResource*>(resource.get());
@@ -662,6 +688,7 @@ namespace MobileGL::MG_Backend::DirectGLES {
                 .FlushMappedRange = Ops_FlushMappedRange,
                 .OnDestroy = Ops_OnDestroy,
                 .AcquirePersistentMap = Ops_AcquirePersistentMap,
+                .ReadbackFromGpu = Ops_ReadbackFromGpu,
             };
         } // namespace
 
@@ -3357,14 +3384,18 @@ namespace MobileGL::MG_Backend::DirectGLES {
                 }
 
                 // ES has no rectangle sampler, and SPIRV-Cross refuses the whole module rather
-                // than approximating one. Where every use takes integer texel coordinates a
-                // rectangle image is indistinguishable from a 2D one, so rewrite the type and let
-                // it through; the pass declines anything it cannot convert exactly.
+                // than approximating one. Rewriting the type to 2D is exact for a lookup that
+                // takes integer texel coordinates and needs the coordinate divided by the
+                // texture size for one that does not - see NormalizeRectSamplerCoordinates
+                // below, which the ESSL the transpiler produces goes through. The pass declines
+                // anything neither step can convert.
                 Vector<unsigned int> rectLoweredSpirv;
+                Bool loweredRectImages = false;
                 if (MG_Util::ShaderTranspiler::ShaderCompiler::LowerRectImagesForEssl(*effectiveSpirv,
                                                                                        rectLoweredSpirv) &&
                     !rectLoweredSpirv.empty()) {
                     effectiveSpirv = &rectLoweredSpirv;
+                    loweredRectImages = true;
                 }
 
                 MG_Util::ShaderTranspiler::SpvcSession spvcSession(*effectiveSpirv,
@@ -3401,6 +3432,26 @@ namespace MobileGL::MG_Backend::DirectGLES {
                 source = ForceFlatIntegerVaryings(source, glShaderType);
                 source = BroadcastLegacyFragColor(std::move(source), glShaderType, m_fragColorBroadcastCount);
                 source = EmulateTextureLodBias(source);
+                if (loweredRectImages) {
+                    // The image type is 2D now, so the transpiled lookups address [0,1]; the
+                    // application wrote them in texels. Only the frontend still knows which
+                    // samplers were declared rectangle.
+                    Vector<String> rectSamplerNames;
+                    const Uint uniformCount = stateProgramObject->GetUniformCount();
+                    for (Uint i = 0; i < uniformCount; ++i) {
+                        switch (stateProgramObject->GetActiveUniformType(i)) {
+                        case GL_SAMPLER_2D_RECT:
+                        case GL_SAMPLER_2D_RECT_SHADOW:
+                        case GL_INT_SAMPLER_2D_RECT:
+                        case GL_UNSIGNED_INT_SAMPLER_2D_RECT:
+                            rectSamplerNames.push_back(stateProgramObject->GetActiveUniformName(i));
+                            break;
+                        default:
+                            break;
+                        }
+                    }
+                    source = NormalizeRectSamplerCoordinates(source, rectSamplerNames);
+                }
                 source = EmulateBaseInstanceInVertexShader(std::move(source), glShaderType);
                 source = PromoteDrawParameterGlobalsToUniforms(std::move(source), glShaderType);
                 source = ForceSupporterOutput(source);

MobileGL/MG_Backend/DirectGLES/Utils.cpp

@@ -596,6 +596,67 @@ namespace MobileGL::MG_Backend::DirectGLES {
             }
             return result;
         }
+
+        String NormalizeRectSamplerCoordinates(const String& glslCode,
+                                               const Vector<String>& rectSamplerNames) {
+#ifdef TRACY_ENABLE
+            ZoneScopedC(TRACY_ZONECOLOR_BACKEND);
+#endif
+            if (rectSamplerNames.empty() || glslCode.find("texture") == String::npos) {
+                return glslCode;
+            }
+
+            // Lookups whose argument 1 is a plain (non-projective) texel-space coordinate on a
+            // rectangle sampler. texelFetch* is absent on purpose: its coordinates are integer
+            // texels on the 2D target too, so it already lands in the right place.
+            static const char* const kRectCoordinateLookups[] = {
+                "textureGatherOffsets", "textureGatherOffset", "textureGather",
+                "textureOffset",        "texture",
+            };
+
+            String result = glslCode;
+            // Right to left, so the offsets of the not-yet-rewritten calls stay valid.
+            for (SizeT scan = result.size(); scan-- > 0;) {
+                if (result[scan] != 't') continue;
+                if (scan > 0 && IsIdentifierChar(result[scan - 1])) continue;
+
+                SizeT openParen = 0;
+                Bool matched = false;
+                for (const char* name : kRectCoordinateLookups) {
+                    const SizeT nameLength = std::strlen(name);
+                    if (result.compare(scan, nameLength, name) != 0) continue;
+                    const SizeT after = result.find_first_not_of(" \t", scan + nameLength);
+                    if (after == String::npos || result[after] != '(') continue;
+                    openParen = after;
+                    matched = true;
+                    break;
+                }
+                if (!matched) continue;
+
+                const Vector<SizeT> marks = SplitCallArguments(result, openParen);
+                if (marks.size() < 2) continue; // needs a sampler and a coordinate
+
+                const SizeT firstArgStart = result.find_first_not_of(" \t", openParen + 1);
+                SizeT firstArgEnd = marks.front();
+                while (firstArgEnd > firstArgStart &&
+                       (result[firstArgEnd - 1] == ' ' || result[firstArgEnd - 1] == '\t')) {
+                    --firstArgEnd;
+                }
+                if (firstArgStart == String::npos || firstArgEnd <= firstArgStart) continue;
+                const String samplerName = result.substr(firstArgStart, firstArgEnd - firstArgStart);
+                if (std::find(rectSamplerNames.begin(), rectSamplerNames.end(), samplerName) ==
+                    rectSamplerNames.end()) {
+                    continue;
+                }
+
+                // Wrap argument 1: (coord) / vec2(textureSize(sampler, 0)).
+                const SizeT coordStart = marks[0] + 1;
+                const SizeT coordEnd = marks[1];
+                result.insert(coordEnd, String(") / vec2(textureSize(") + samplerName + ", 0)))");
+                result.insert(coordStart, "((");
+            }
+            return result;
+        }
     } // namespace PrgramImpl
 
     namespace Utils {

MobileGL/MG_Backend/DirectGLES/Utils.h

@@ -129,6 +129,15 @@ namespace MobileGL::MG_Backend::DirectGLES {
         // all have a zero bias is therefore unaffected. Returns the source unchanged when
         // there is nothing to rewrite.
         String EmulateTextureLodBias(const String& glslCode);
+        // GL_TEXTURE_RECTANGLE is emulated on an ES 2D texture and LowerRectImagesForEssl
+        // rewrites the image type to match, but a rectangle lookup addresses texels
+        // directly while a 2D one addresses [0,1] - so every lookup that takes normalized
+        // coordinates has to divide by the texture's size. `rectSamplerNames` is the set of
+        // samplers the program declared as rectangle; texelFetch is left alone (its
+        // coordinates are unnormalized on both targets) and so is anything projective,
+        // which LowerRectImagesForEssl still declines outright.
+        String NormalizeRectSamplerCoordinates(const String& glslCode,
+                                               const Vector<String>& rectSamplerNames);
     } // namespace PrgramImpl
 
     namespace Utils {

MobileGL/MG_Backend/DirectVulkan/DirectVulkan.cpp

@@ -1578,6 +1578,12 @@ namespace MobileGL::MG_Backend::DirectVulkan {
             // (and, via the SharedPtrs, the records), never pool slots, so
             // stale queries are always safe to delete.
             Uint64 rendererGeneration = 0;
+            // Kind::XfbGenerated - the frontend's paused-draw primitive counter when the
+            // query began. VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT counts only what the
+            // capture saw, so a draw made while the span was paused is invisible to it -
+            // but GL_PRIMITIVES_GENERATED counts what the last vertex processing stage
+            // emitted regardless. The delta closes that gap at result time.
+            Uint64 pausedPrimitiveSnapshot = 0;
         };
     } // namespace
 
@@ -1676,6 +1682,10 @@ namespace MobileGL::MG_Backend::DirectVulkan {
                                                         primitives)) {
                 return false;
             }
+            if (query->kind == VulkanTimerQuery::Kind::XfbGenerated && MG_State::pGLContext != nullptr) {
+                primitives += MG_State::pGLContext->GetTransformFeedbackPausedPrimitiveCounter() -
+                              query->pausedPrimitiveSnapshot;
+            }
             *outNanoseconds = primitives;
             return true;
         }
@@ -1719,6 +1729,8 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         auto* query = new VulkanTimerQuery{};
         query->kind = generated ? VulkanTimerQuery::Kind::XfbGenerated : VulkanTimerQuery::Kind::XfbWritten;
         query->rendererGeneration = GetRendererGeneration();
+        query->pausedPrimitiveSnapshot =
+            MG_State::pGLContext ? MG_State::pGLContext->GetTransformFeedbackPausedPrimitiveCounter() : 0;
         return query;
     }
 

MobileGL/MG_Backend/DirectVulkan/Renderer/UniformManager.cpp

@@ -650,6 +650,14 @@ namespace MobileGL::MG_Backend::DirectVulkan {
             return false;
         }
 
+        // The shader may write this buffer, and those writes land in GPU memory behind the
+        // frontend's CPU shadow - which is what MapBuffer and GetBufferSubData read.
+        // Host-visible coherent GPU residency makes the shadow BE that memory, so the
+        // results are visible without a readback path, exactly as for a capture buffer.
+        bufferObject->EnsureGpuResidentStorage();
+        // ... and the read that follows has to wait for this draw or dispatch to retire.
+        bufferObject->MarkGpuWritten();
+
         BufferSlice slice{};
         if (!m_bufferManager->AcquireResidentSlice(BufferKind::ShaderStorage, bufferObject, slice) || !slice.IsValid()) {
             MGLOG_E("ResolveStorageBufferDescriptor: failed to sync GL buffer %u for block '%s'",

MobileGL/MG_Backend/DirectVulkan/Renderer/VkBufferManager.cpp

@@ -7,6 +7,8 @@
 // End of Source File Header
 
 #include "VkBufferManager.h"
+#include "../DirectVulkan.h"
+#include "VulkanRenderer.h"
 
 namespace MobileGL::MG_Backend::DirectVulkan {
     namespace {
@@ -57,6 +59,18 @@ namespace MobileGL::MG_Backend::DirectVulkan {
             }
         }
 
+        // The CPU is about to read a buffer a shader wrote. Its bytes live in coherent
+        // host-visible GPU storage (EnsureGpuResidentStorage adopts it when the buffer is
+        // bound as a shader storage buffer), so nothing needs copying - but coherence only
+        // says the writes are visible once they have happened, so the work has to retire
+        // first.
+        void Ops_ReadbackFromGpu(BufferObject& bufferObject) {
+            (void)bufferObject;
+            if (pVulkanRenderer) {
+                pVulkanRenderer->FinishPendingGpuWork();
+            }
+        }
+
         void* Ops_AcquirePersistentMap(BufferObject& bufferObject) {
             if (g_activeBufferManager) {
                 return g_activeBufferManager->AcquirePersistentMap(bufferObject);
@@ -80,6 +94,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
             .FlushMappedRange = Ops_FlushMappedRange,
             .OnDestroy = Ops_OnDestroy,
             .AcquirePersistentMap = Ops_AcquirePersistentMap,
+            .ReadbackFromGpu = Ops_ReadbackFromGpu,
         };
     } // namespace
 

MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.cpp

@@ -2798,6 +2798,10 @@ void main() {
         }
         m_vertexInputStateFactory.reset();
         m_xfbCounterBuffer.Destroy();
+        m_xfbCounterSlotByObject.clear();
+        m_xfbNextCounterSlot = 0;
+        m_xfbCountersValid.fill(false);
+        m_xfbLastSeenGeneration.fill(0);
         if (m_occlusionQueryPool != VK_NULL_HANDLE) {
             vkDestroyQueryPool(m_device, m_occlusionQueryPool, nullptr);
             m_occlusionQueryPool = VK_NULL_HANDLE;
@@ -6915,6 +6919,17 @@ void main() {
 
     }
 
+    Bool VulkanRenderer::FinishPendingGpuWork() {
+        auto& frame = m_frameContext.GetCurrent();
+        if (!frame.isCommandRecording) {
+            return true;
+        }
+        if (VkRenderPassManager::GetActiveRenderPass() != nullptr) {
+            VkRenderPassManager::EndRenderPass(frame.commandBuffer);
+        }
+        return SubmitReadbackCommandsAndWait(frame);
+    }
+
     Bool VulkanRenderer::SubmitReadbackCommandsAndWait(FrameContext::FrameData& frame) {
         if (frame.isCommandRecording) {
             m_frameContext.EndCommandRecording();
@@ -8000,11 +8015,30 @@ void main() {
         resource->layout = finalLayout;
     }
 
+    Uint32 VulkanRenderer::CurrentXfbCounterSlot() {
+        const Uint name = MG_State::pGLContext->GetBoundTransformFeedbackName();
+        const auto it = m_xfbCounterSlotByObject.find(name);
+        if (it != m_xfbCounterSlotByObject.end()) {
+            return it->second;
+        }
+        // Past the tracked set every object shares slot group 0. Only concurrently-paused
+        // spans need distinct groups, and applications do not keep sixteen of those open.
+        const Uint32 slot = m_xfbNextCounterSlot < kXfbCounterObjectSlots ? m_xfbNextCounterSlot++ : 0;
+        m_xfbCounterSlotByObject[name] = slot;
+        return slot;
+    }
+
     Bool VulkanRenderer::BeginXfbCaptureForDraw(FrameContext::FrameData& frame) {
         if (!m_transformFeedbackFeatureEnabled || MG_State::pGLContext == nullptr ||
             !MG_State::pGLContext->IsTransformFeedbackActive()) {
             return false;
         }
+        // A paused span captures nothing, and the counter buffers keep their values, so the
+        // next resumed draw appends exactly where the last captured one stopped - which is
+        // what pause/resume means (ARB_transform_feedback2).
+        if (MG_State::pGLContext->IsTransformFeedbackPaused()) {
+            return false;
+        }
         const auto& program = MG_State::pGLContext->GetTransformFeedbackProgram();
         if (!program || program->GetTransformFeedbackVaryingCount() == 0) {
             return false;
@@ -8017,7 +8051,7 @@ void main() {
         if (!m_xfbCounterBuffer.IsValid()) {
             if (!m_xfbCounterBuffer.Create({
                     .allocator = m_allocator,
-                    .size = 16,
+                    .size = 16 * kXfbCounterObjectSlots,
                     .usage = VK_BUFFER_USAGE_TRANSFORM_FEEDBACK_COUNTER_BUFFER_BIT_EXT |
                              VK_BUFFER_USAGE_TRANSFER_DST_BIT,
                     .memoryUsage = VMA_MEMORY_USAGE_AUTO,
@@ -8058,15 +8092,16 @@ void main() {
         s_vkCmdBindTransformFeedbackBuffersEXT(frame.commandBuffer, 0, static_cast<Uint32>(bufferCount), buffers,
                                                offsets, sizes);
 
+        const Uint32 counterSlot = CurrentXfbCounterSlot();
         const Uint64 generation = MG_State::pGLContext->GetTransformFeedbackGeneration();
-        const Bool resume = m_xfbCountersValid && m_xfbLastSeenGeneration == generation;
-        m_xfbLastSeenGeneration = generation;
+        const Bool resume = m_xfbCountersValid[counterSlot] && m_xfbLastSeenGeneration[counterSlot] == generation;
+        m_xfbLastSeenGeneration[counterSlot] = generation;
 
         VkBuffer counterBuffers[4] = {};
         VkDeviceSize counterOffsets[4] = {};
         for (SizeT i = 0; i < bufferCount; ++i) {
             counterBuffers[i] = m_xfbCounterBuffer.GetHandle();
-            counterOffsets[i] = static_cast<VkDeviceSize>(i) * 4;
+            counterOffsets[i] = static_cast<VkDeviceSize>(counterSlot) * 16 + static_cast<VkDeviceSize>(i) * 4;
         }
         if (resume) {
             s_vkCmdBeginTransformFeedbackEXT(frame.commandBuffer, 0, static_cast<Uint32>(bufferCount),
@@ -8083,15 +8118,16 @@ void main() {
         }
         const auto& program = MG_State::pGLContext->GetTransformFeedbackProgram();
         const SizeT bufferCount = program ? std::min<SizeT>(program->GetTransformFeedbackBufferCount(), 4) : 0;
+        const Uint32 counterSlot = CurrentXfbCounterSlot();
         VkBuffer counterBuffers[4] = {};
         VkDeviceSize counterOffsets[4] = {};
         for (SizeT i = 0; i < bufferCount; ++i) {
             counterBuffers[i] = m_xfbCounterBuffer.GetHandle();
-            counterOffsets[i] = static_cast<VkDeviceSize>(i) * 4;
+            counterOffsets[i] = static_cast<VkDeviceSize>(counterSlot) * 16 + static_cast<VkDeviceSize>(i) * 4;
         }
         s_vkCmdEndTransformFeedbackEXT(frame.commandBuffer, 0, static_cast<Uint32>(bufferCount), counterBuffers,
                                        counterOffsets);
-        m_xfbCountersValid = true;
+        m_xfbCountersValid[counterSlot] = true;
     }
 
     void VulkanRenderer::DrawArrays(const DrawCmd& payload) {
@@ -8380,6 +8416,16 @@ void main() {
         }
     }
 
+    // Byte size of the command structures GL defines for the indirect draws (GL 4.6 core
+    // 10.3.10): four uint32 for DrawArraysIndirectCommand, five for DrawElementsIndirect-
+    // Command. These bound the read out of GL_DRAW_INDIRECT_BUFFER and are the default
+    // stride, so they must be GL's sizes and not this renderer's own draw-parameter
+    // structs - DrawCmdParam carries two extra members and is 24 bytes, which made every
+    // glDrawArraysIndirect on a tightly-sized indirect buffer look out of range and draw
+    // nothing.
+    constexpr SizeT kGLDrawArraysIndirectCommandBytes = 4 * sizeof(Uint32);
+    constexpr SizeT kGLDrawElementsIndirectCommandBytes = 5 * sizeof(Uint32);
+
     void VulkanRenderer::MultiDrawElementsIndirectCount(GLenum mode, GLenum type, const void* indirect,
                                                         GLintptr drawcount, GLsizei maxdrawcount, GLsizei stride) {
         auto& frame = m_frameContext.GetCurrent();
@@ -8388,11 +8434,11 @@ void main() {
             return;
         }
         if (stride == 0) {
-            stride = sizeof(DrawIndexedCmdParam);
+            stride = kGLDrawElementsIndirectCommandBytes;
         }
-        if (stride < static_cast<GLsizei>(sizeof(DrawIndexedCmdParam))) {
+        if (stride < static_cast<GLsizei>(kGLDrawElementsIndirectCommandBytes)) {
             MGLOG_E("MultiDrawElementsIndirectCount skipped: stride %d is smaller than command size %zu",
-                    stride, sizeof(DrawIndexedCmdParam));
+                    stride, kGLDrawElementsIndirectCommandBytes);
             return;
         }
 
@@ -8411,7 +8457,7 @@ void main() {
 
         const SizeT commandOffset = reinterpret_cast<SizeT>(indirect);
         const SizeT commandBytes = commandOffset +
-            static_cast<SizeT>(stride) * static_cast<SizeT>(maxdrawcount - 1) + sizeof(DrawIndexedCmdParam);
+            static_cast<SizeT>(stride) * static_cast<SizeT>(maxdrawcount - 1) + kGLDrawElementsIndirectCommandBytes;
         auto drawBuffer = MG_State::pGLContext->GetBufferBindingSlot(BufferTarget::DrawIndirect).GetBoundObject();
         if (!drawBuffer || commandBytes > drawBuffer->GetSize()) {
             MGLOG_E("MultiDrawElementsIndirectCount skipped: invalid GL_DRAW_INDIRECT_BUFFER binding or range");
@@ -8489,11 +8535,11 @@ void main() {
             return;
         }
         if (stride == 0) {
-            stride = sizeof(DrawIndexedCmdParam);
+            stride = kGLDrawElementsIndirectCommandBytes;
         }
-        if (stride < static_cast<GLsizei>(sizeof(DrawIndexedCmdParam))) {
+        if (stride < static_cast<GLsizei>(kGLDrawElementsIndirectCommandBytes)) {
             MGLOG_E("MultiDrawElementsIndirect skipped: stride %d is smaller than command size %zu",
-                    stride, sizeof(DrawIndexedCmdParam));
+                    stride, kGLDrawElementsIndirectCommandBytes);
             return;
         }
 
@@ -8512,7 +8558,7 @@ void main() {
 
         const SizeT commandOffset = reinterpret_cast<SizeT>(indirect);
         const SizeT commandBytes = commandOffset +
-            static_cast<SizeT>(stride) * static_cast<SizeT>(drawcount - 1) + sizeof(DrawIndexedCmdParam);
+            static_cast<SizeT>(stride) * static_cast<SizeT>(drawcount - 1) + kGLDrawElementsIndirectCommandBytes;
         auto drawBuffer = MG_State::pGLContext->GetBufferBindingSlot(BufferTarget::DrawIndirect).GetBoundObject();
         if (!drawBuffer || commandBytes > drawBuffer->GetSize()) {
             MGLOG_E("MultiDrawElementsIndirect skipped: invalid GL_DRAW_INDIRECT_BUFFER binding or range");
@@ -8571,17 +8617,17 @@ void main() {
             return;
         }
         if (stride == 0) {
-            stride = sizeof(DrawCmdParam);
+            stride = kGLDrawArraysIndirectCommandBytes;
         }
-        if (stride < static_cast<GLsizei>(sizeof(DrawCmdParam))) {
+        if (stride < static_cast<GLsizei>(kGLDrawArraysIndirectCommandBytes)) {
             MGLOG_E("MultiDrawArraysIndirect skipped: stride %d is smaller than command size %zu",
-                    stride, sizeof(DrawCmdParam));
+                    stride, kGLDrawArraysIndirectCommandBytes);
             return;
         }
 
         const SizeT commandOffset = reinterpret_cast<SizeT>(indirect);
         const SizeT commandBytes = commandOffset +
-            static_cast<SizeT>(stride) * static_cast<SizeT>(drawcount - 1) + sizeof(DrawCmdParam);
+            static_cast<SizeT>(stride) * static_cast<SizeT>(drawcount - 1) + kGLDrawArraysIndirectCommandBytes;
         auto drawBuffer = MG_State::pGLContext->GetBufferBindingSlot(BufferTarget::DrawIndirect).GetBoundObject();
         if (!drawBuffer || commandBytes > drawBuffer->GetSize()) {
             MGLOG_E("MultiDrawArraysIndirect skipped: invalid GL_DRAW_INDIRECT_BUFFER binding or range");

MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.h

@@ -498,12 +498,19 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         static inline PFN_vkCmdBeginTransformFeedbackEXT s_vkCmdBeginTransformFeedbackEXT = nullptr;
         static inline PFN_vkCmdEndTransformFeedbackEXT s_vkCmdEndTransformFeedbackEXT = nullptr;
         // Counter buffers (one 4-byte slot per capture binding) let consecutive
-        // draws within one glBeginTransformFeedback append GL-style.
+        // draws within one glBeginTransformFeedback append GL-style. Transform feedback
+        // objects can each hold an open, paused span at the same time, so the counters are
+        // per object: one group of four slots each, handed out on first use.
+        static constexpr SizeT kXfbCounterObjectSlots = 16;
         VkBufferObject m_xfbCounterBuffer;
-        // Non-zero while inside a GL Begin/End with at least one captured draw
-        // recorded; selects counter-buffer resume on the next captured draw.
-        Bool m_xfbCountersValid = false;
-        Uint64 m_xfbLastSeenGeneration = 0;
+        UnorderedMap<Uint, Uint32> m_xfbCounterSlotByObject;
+        Uint32 m_xfbNextCounterSlot = 0;
+        // Set for a slot once a captured draw has been recorded into its span; selects
+        // counter-buffer resume on the next captured draw of the same span.
+        Array<Bool, kXfbCounterObjectSlots> m_xfbCountersValid{};
+        Array<Uint64, kXfbCounterObjectSlots> m_xfbLastSeenGeneration{};
+        // Counter slot group of the bound transform feedback object.
+        Uint32 CurrentXfbCounterSlot();
         // Wraps a recorded draw with BeginTransformFeedbackEXT/EndTransformFeedbackEXT
         // when GL transform feedback is active; binds capture buffers on demand.
         Bool BeginXfbCaptureForDraw(FrameContext::FrameData& frame);
@@ -788,6 +795,14 @@ namespace MobileGL::MG_Backend::DirectVulkan {
                                            VkImageLayout finalLayout);
         Bool SubmitReadbackCommandsAndWait(FrameContext::FrameData& frame);
 
+    public:
+        // Submits whatever is recorded and waits for it. The CPU is about to read memory
+        // a shader wrote (a mapped shader storage buffer), and coherent host-visible
+        // storage only guarantees visibility once the work that produced it has retired.
+        Bool FinishPendingGpuWork();
+
+    private:
+
         void ShutdownSwapchain();
 
         // Static functions

MobileGL/MG_Impl/GLImpl/Buffer/GL_Buffer.cpp

@@ -330,12 +330,21 @@ namespace MobileGL::MG_Impl::GLImpl {
                     } else if (access & BufferMappingAccessBit::Write) {
                         *params = GL_WRITE_ONLY;
                     } else {
-                        *params = 0;
+                        *params = GL_READ_WRITE;
                     }
                 } else {
-                    *params = 0;
+                    // Initial value, and what glUnmapBuffer restores (GL 4.6 core table 6.2).
+                    *params = GL_READ_WRITE;
                 }
                 break;
+            case GL_BUFFER_ACCESS_FLAGS:
+                // The MapBufferRange flags verbatim; glMapBuffer's access enum has already been
+                // normalised into the same bits. Zero while the buffer is not mapped.
+                *params = bufferObject->IsMapped()
+                    ? static_cast<GLint>(
+                          MG_Util::ConvertBufferMappingAccessToGLEnum(bufferObject->GetMappingAccess()))
+                    : 0;
+                break;
             case GL_BUFFER_MAPPED:
                 *params = bufferObject->IsMapped() ? GL_TRUE : GL_FALSE;
                 break;
@@ -878,6 +887,7 @@ namespace MobileGL::MG_Impl::GLImpl {
             return;
         }
 
+        bufferObject->SyncGpuWrites();
         bufferObject->DownloadSubData(data, static_cast<SizeT>(offset), static_cast<SizeT>(size));
     }
 
@@ -1366,6 +1376,7 @@ namespace MobileGL::MG_Impl::GLImpl {
         if (buffer == 0) {
             point.Bind(nullptr);
             point.SetRange(Range1D(0, 0));
+            GetBufferBindingSlot(bufferTarget).Bind(nullptr);
             return;
         }
 
@@ -1384,6 +1395,12 @@ namespace MobileGL::MG_Impl::GLImpl {
         } else {
             point.ClearRange();
         }
+        // The indexed bind also binds to the generic binding point of the same target
+        // (GL 4.6 core 6.1.1). Callers rely on it: the texture_gather tests set up their
+        // SSBO with BindBufferBase and then size it through glBufferData on the generic
+        // target alone, which would otherwise raise GL_INVALID_OPERATION and leave the
+        // buffer with no storage.
+        GetBufferBindingSlot(bufferTarget).Bind(bufferObject);
     }
 
     void BindBufferRange_State(GLenum target, GLuint index, GLuint buffer, GLintptr offset, GLsizeiptr size) {
@@ -1407,6 +1424,7 @@ namespace MobileGL::MG_Impl::GLImpl {
         if (buffer == 0) {
             point.Bind(nullptr);
             point.SetRange(Range1D(0, 0));
+            GetBufferBindingSlot(bufferTarget).Bind(nullptr);
             return;
         }
 
@@ -1424,6 +1442,8 @@ namespace MobileGL::MG_Impl::GLImpl {
         } else {
             point.ClearRange();
         }
+        // Also the generic binding point, exactly as BindBufferBase (GL 4.6 core 6.1.1).
+        GetBufferBindingSlot(bufferTarget).Bind(bufferObject);
     }
 
     /* @INSERTION_POINT:FUNCTION_IMPLEMENTATION@ */

MobileGL/MG_Impl/GLImpl/Drawing/GL_Drawing.cpp

@@ -11,6 +11,7 @@
 #include <MG_State/GLState/Core.h>
 #include <MG_State/EGLState/Core.h>
 #include <MG_Backend/BackendObjects.h>
+#include "../Getter/GL_Getter.h"
 
 namespace MobileGL::MG_Impl::GLImpl {
     static Bool ValidateCurrentProgramForExecution(const char* functionName) {
@@ -72,6 +73,12 @@ namespace MobileGL::MG_Impl::GLImpl {
     // Geometry amplification is not modelled here.
     static void AccountTransformFeedbackPrimitives(GLenum mode, GLsizei count) {
         if (!MG_State::pGLContext->IsTransformFeedbackActive()) return;
+        // A paused span captures nothing, so a draw made while paused contributes to
+        // PRIMITIVES_GENERATED but not to TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN.
+        if (MG_State::pGLContext->IsTransformFeedbackPaused()) {
+            MG_State::pGLContext->AddTransformFeedbackPausedPrimitives(CountPrimitivesForDraw(mode, count));
+            return;
+        }
         Uint64 primitives = CountPrimitivesForDraw(mode, count);
         if (primitives == 0) return;
         MG_State::pGLContext->AddTransformFeedbackInputPrimitives(primitives);
@@ -115,7 +122,36 @@ namespace MobileGL::MG_Impl::GLImpl {
         MG_State::pGLContext->AddTransformFeedbackCapturedVertices(primitives * verticesPerPrimitive);
     }
 
+    // Every primitive mode a draw command accepts (GL 4.6 core table 10.1, plus
+    // GL_PATCHES for the tessellation pipeline). Anything else is GL_INVALID_ENUM.
+    static Bool IsAcceptedPrimitiveMode(GLenum mode) {
+        switch (mode) {
+        case GL_POINTS:
+        case GL_LINES:
+        case GL_LINE_LOOP:
+        case GL_LINE_STRIP:
+        case GL_LINES_ADJACENCY:
+        case GL_LINE_STRIP_ADJACENCY:
+        case GL_TRIANGLES:
+        case GL_TRIANGLE_STRIP:
+        case GL_TRIANGLE_FAN:
+        case GL_TRIANGLES_ADJACENCY:
+        case GL_TRIANGLE_STRIP_ADJACENCY:
+        case GL_PATCHES:
+            return true;
+        default:
+            return false;
+        }
+    }
+
     static Bool ValidatePrimitiveModeForBackend(const char* functionName, GLenum mode) {
+        if (!IsAcceptedPrimitiveMode(mode)) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidEnum,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", functionName, "mode is not an accepted primitive type."));
+            return false;
+        }
+
         const auto& activeBackendObject = MG_Backend::pActiveBackendObject;
         if (!activeBackendObject) {
             MG_State::pGLContext->RecordError(
@@ -133,11 +169,51 @@ namespace MobileGL::MG_Impl::GLImpl {
             return false;
         }
 
+        // A geometry stage only accepts the primitive types that decompose into its declared
+        // input primitive (GL 4.6 core 11.3.1); anything else is INVALID_OPERATION. GL_PATCHES
+        // is the tessellation pipeline's input and reaches the geometry stage already
+        // converted, so it is not constrained here.
+        const auto& currentProgram = MG_State::pGLContext->GetCurrentProgram();
+        const GLenum gsInput = currentProgram ? currentProgram->GetGeometryInputType() : GL_NONE;
+        if (gsInput != GL_NONE && mode != GL_PATCHES) {
+            Bool compatible = false;
+            switch (gsInput) {
+            case GL_POINTS:
+                compatible = mode == GL_POINTS;
+                break;
+            case GL_LINES:
+                compatible = mode == GL_LINES || mode == GL_LINE_STRIP || mode == GL_LINE_LOOP;
+                break;
+            case GL_LINES_ADJACENCY:
+                compatible = mode == GL_LINES_ADJACENCY || mode == GL_LINE_STRIP_ADJACENCY;
+                break;
+            case GL_TRIANGLES:
+                compatible = mode == GL_TRIANGLES || mode == GL_TRIANGLE_STRIP || mode == GL_TRIANGLE_FAN;
+                break;
+            case GL_TRIANGLES_ADJACENCY:
+                compatible = mode == GL_TRIANGLES_ADJACENCY || mode == GL_TRIANGLE_STRIP_ADJACENCY;
+                break;
+            default:
+                break;
+            }
+            if (!compatible) {
+                MG_State::pGLContext->RecordError(
+                    ErrorCode::InvalidOperation,
+                    MakeUnique<GenericErrorInfo>(
+                        "MG_Impl/GLImpl", functionName,
+                        "Primitive mode is incompatible with the geometry shader's input primitive type."));
+                return false;
+            }
+        }
+
         // While transform feedback is active the draw's primitive type must match
         // the feedback primitive mode (GL 3.3 core 13.2.2). With a geometry shader
         // the constraint moves to the shader's output primitive type instead, so
-        // the draw mode itself is unconstrained here.
+        // the draw mode itself is unconstrained here. A paused span is exempt: it
+        // captures nothing, so there is nothing for the mode to be incompatible with
+        // (GL 4.6 core 13.2.3).
         if (MG_State::pGLContext->IsTransformFeedbackActive() &&
+            !MG_State::pGLContext->IsTransformFeedbackPaused() &&
             !(MG_State::pGLContext->GetTransformFeedbackProgram() &&
               MG_State::pGLContext->GetTransformFeedbackProgram()->GetShaderIndexByStage(ShaderStage::Geometry) >= 0)) {
             const GLenum feedbackMode = MG_State::pGLContext->GetTransformFeedbackPrimitiveMode();
@@ -168,6 +244,58 @@ namespace MobileGL::MG_Impl::GLImpl {
         return true;
     }
 
+    // Byte size of the command structures the indirect draws read (GL 4.6 core 10.3.10).
+    constexpr SizeT kDrawArraysIndirectCommandBytes = 4 * sizeof(Uint32);
+    constexpr SizeT kDrawElementsIndirectCommandBytes = 5 * sizeof(Uint32);
+
+    // Shared preconditions of every *Indirect draw: `indirect` is a byte offset into the
+    // buffer bound to GL_DRAW_INDIRECT_BUFFER, must be 4-byte aligned, and the whole
+    // command has to lie inside that buffer.
+    static Bool ValidateIndirectDrawSource(const char* functionName, const void* indirect, SizeT commandBytes) {
+        const auto offset = reinterpret_cast<uintptr_t>(indirect);
+        if (offset % 4 != 0) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidValue,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", functionName,
+                                             "indirect offset must be a multiple of 4."));
+            return false;
+        }
+
+        const auto& buffer = MG_State::pGLContext->GetBufferBindingSlot(BufferTarget::DrawIndirect).GetBoundObject();
+        if (!buffer) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", functionName,
+                                             "No buffer is bound to GL_DRAW_INDIRECT_BUFFER."));
+            return false;
+        }
+
+        if (offset + commandBytes > buffer->GetSize()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", functionName,
+                                             "The indirect command extends past the end of the bound "
+                                             "GL_DRAW_INDIRECT_BUFFER."));
+            return false;
+        }
+        return true;
+    }
+
+    // Index type accepted by the DrawElements family (GL 4.6 core 10.3.9).
+    static Bool ValidateDrawElementsIndexType(const char* functionName, GLenum type) {
+        switch (type) {
+        case GL_UNSIGNED_BYTE:
+        case GL_UNSIGNED_SHORT:
+        case GL_UNSIGNED_INT:
+            return true;
+        default:
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidEnum,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", functionName, "type is not an accepted index type."));
+            return false;
+        }
+    }
+
     void Clear_Backend(GLbitfield mask) {
 #ifdef TRACY_ENABLE
         ZoneScopedC(TRACY_ZONECOLOR_BACKEND);
@@ -362,6 +490,28 @@ namespace MobileGL::MG_Impl::GLImpl {
         dispatchComputeIndirect(indirect);
     }
 
+    void PatchParameteri(GLenum pname, GLint value) {
+        if (pname != GL_PATCH_VERTICES) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidEnum,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "pname must be GL_PATCH_VERTICES."));
+            return;
+        }
+        GLint maxPatchVertices = 32;
+        GetIntegerv(GL_MAX_PATCH_VERTICES, &maxPatchVertices);
+        if (value <= 0 || value > maxPatchVertices) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidValue,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             "value must be in [1, GL_MAX_PATCH_VERTICES]."));
+            return;
+        }
+        MG_State::pGLContext->SetPatchVertices(static_cast<Uint>(value));
+        if (const auto patchParameteri = MG_Backend::gBackendFunctionsTable.GL.PatchParameteri) {
+            patchParameteri(pname, value);
+        }
+    }
+
     void MemoryBarrier(GLbitfield barriers) {
         auto memoryBarrier = MG_Backend::gBackendFunctionsTable.GL.MemoryBarrier;
         if (!memoryBarrier) {
@@ -467,6 +617,8 @@ namespace MobileGL::MG_Impl::GLImpl {
     void DrawElementsIndirect(GLenum mode, GLenum type, const void* indirect) {
         if (!ValidateCurrentProgramForExecution(__func__)) return;
         if (!ValidatePrimitiveModeForBackend(__func__, mode)) return;
+        if (!ValidateDrawElementsIndexType(__func__, type)) return;
+        if (!ValidateIndirectDrawSource(__func__, indirect, kDrawElementsIndirectCommandBytes)) return;
         DrawElementsIndirect_Backend(mode, type, indirect);
     }
 
@@ -486,6 +638,7 @@ namespace MobileGL::MG_Impl::GLImpl {
     void DrawArraysIndirect(GLenum mode, const void* indirect) {
         if (!ValidateCurrentProgramForExecution(__func__)) return;
         if (!ValidatePrimitiveModeForBackend(__func__, mode)) return;
+        if (!ValidateIndirectDrawSource(__func__, indirect, kDrawArraysIndirectCommandBytes)) return;
         DrawArraysIndirect_Backend(mode, indirect);
     }
 
@@ -563,9 +716,12 @@ namespace MobileGL::MG_Impl::GLImpl {
                     "No program with transform feedback varyings is active."));
             return;
         }
-        // Every capture buffer slot the program's mode uses must have a buffer bound.
+        // Every capture buffer slot the program's mode uses must have a buffer bound. A slot
+        // of stride 0 - two consecutive gl_NextBuffer entries - captures nothing and so needs
+        // no binding.
         const SizeT usedBufferCount = program->GetTransformFeedbackBufferCount();
         for (SizeT i = 0; i < usedBufferCount; ++i) {
+            if (program->GetTransformFeedbackStride(static_cast<Uint32>(i)) == 0) continue;
             const auto& point = MG_State::pGLContext->GetBufferBindingPoint(BufferTarget::TransformFeedback,
                                                                             static_cast<Uint>(i));
             if (point.GetBoundObject() == nullptr) {
@@ -679,4 +835,175 @@ namespace MobileGL::MG_Impl::GLImpl {
         FixupGsStripCaptureOrder(capturedProgram, inputPrimitives);
     }
 
+    void PauseTransformFeedback(void) {
+        if (!MG_State::pGLContext->IsTransformFeedbackActive() ||
+            MG_State::pGLContext->IsTransformFeedbackPaused()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             "Transform feedback is not active, or is already paused."));
+            return;
+        }
+        MG_State::pGLContext->SetTransformFeedbackPaused(true);
+        if (const auto pauseXfb = MG_Backend::gBackendFunctionsTable.GL.PauseTransformFeedback) {
+            pauseXfb();
+        }
+    }
+
+    void ResumeTransformFeedback(void) {
+        if (!MG_State::pGLContext->IsTransformFeedbackActive() ||
+            !MG_State::pGLContext->IsTransformFeedbackPaused()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "Transform feedback is not paused."));
+            return;
+        }
+        MG_State::pGLContext->SetTransformFeedbackPaused(false);
+        if (const auto resumeXfb = MG_Backend::gBackendFunctionsTable.GL.ResumeTransformFeedback) {
+            resumeXfb();
+        }
+    }
+
+    void GenTransformFeedbacks(GLsizei n, GLuint* ids) {
+        if (n < 0) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidValue,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "n must be non-negative."));
+            return;
+        }
+        if (n == 0 || ids == nullptr) return;
+        Vector<Uint> names;
+        MG_State::pGLContext->GenTransformFeedbackNames(static_cast<Uint>(n), names);
+        Memcpy(ids, names.data(), static_cast<SizeT>(n) * sizeof(GLuint));
+    }
+
+    void DeleteTransformFeedbacks(GLsizei n, const GLuint* ids) {
+        if (n < 0) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidValue,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "n must be non-negative."));
+            return;
+        }
+        if (ids == nullptr) return;
+        for (GLsizei i = 0; i < n; ++i) {
+            const GLuint id = ids[i];
+            // Unknown names and 0 are silently ignored; an object whose capture span is
+            // still open is not (GL 4.6 core 13.2.1).
+            if (id == 0 || !MG_State::pGLContext->ValidateTransformFeedbackName(id)) continue;
+            if (id == MG_State::pGLContext->GetBoundTransformFeedbackName() &&
+                MG_State::pGLContext->IsTransformFeedbackActive()) {
+                MG_State::pGLContext->RecordError(
+                    ErrorCode::InvalidOperation,
+                    MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                                 "Cannot delete a transform feedback object whose capture is active."));
+                continue;
+            }
+            if (const auto deleteXfb = MG_Backend::gBackendFunctionsTable.GL.DeleteTransformFeedback) {
+                deleteXfb(id);
+            }
+            MG_State::pGLContext->MarkTransformFeedbackObjectForDeletion(id);
+        }
+    }
+
+    void BindTransformFeedback(GLenum target, GLuint id) {
+        if (target != GL_TRANSFORM_FEEDBACK) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidEnum,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "target must be GL_TRANSFORM_FEEDBACK."));
+            return;
+        }
+        // A running capture pins its object; only a paused one may be swapped out.
+        if (MG_State::pGLContext->IsTransformFeedbackActive() &&
+            !MG_State::pGLContext->IsTransformFeedbackPaused()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             "Transform feedback is active and not paused."));
+            return;
+        }
+        if (!MG_State::pGLContext->ValidateTransformFeedbackName(id)) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             std::to_string(id) + " is not a transform feedback object name."));
+            return;
+        }
+        MG_State::pGLContext->BindTransformFeedbackObject(id);
+        if (const auto bindXfb = MG_Backend::gBackendFunctionsTable.GL.BindTransformFeedback) {
+            bindXfb(id);
+        }
+    }
+
+    GLboolean IsTransformFeedback(GLuint id) {
+        // Name 0 is the default object, and a name glGenTransformFeedbacks handed out only
+        // becomes the name of an object once it has been bound.
+        return MG_State::pGLContext->IsTransformFeedbackObject(id) ? GL_TRUE : GL_FALSE;
+    }
+
+    // glDrawTransformFeedback[Stream][Instanced]: replays the vertices the named object
+    // captured in its last completed span, as if by glDrawArraysInstanced with that count
+    // (GL 4.6 core 10.3.7).
+    static void DrawTransformFeedbackImpl(const char* functionName, GLenum mode, GLuint id, GLuint stream,
+                                          GLsizei instancecount) {
+        if (!ValidateCurrentProgramForExecution(functionName)) return;
+        if (!ValidatePrimitiveModeForBackend(functionName, mode)) return;
+        if (instancecount < 0) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidValue,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", functionName, "instancecount must be non-negative."));
+            return;
+        }
+        if (!MG_State::pGLContext->ValidateTransformFeedbackName(id)) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidValue,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", functionName,
+                                             std::to_string(id) + " is not a transform feedback object name."));
+            return;
+        }
+        // GL_MAX_VERTEX_STREAMS is 1, so stream 0 is the only one that exists.
+        if (stream != 0) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidValue,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", functionName,
+                                             "stream must be less than GL_MAX_VERTEX_STREAMS."));
+            return;
+        }
+        // Drawing from an object whose capture is currently open is legal and deliberate:
+        // it is how a transform feedback result is fed straight back into the next span
+        // (ARB_transform_feedback2 lists no such restriction).
+        if (!MG_State::pGLContext->HasTransformFeedbackCompletedSpan(id)) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", functionName,
+                                             "glEndTransformFeedback has never been called for this object."));
+            return;
+        }
+
+        const Uint64 vertices = MG_State::pGLContext->GetTransformFeedbackRecordedVertices(id);
+        if (vertices == 0) return;
+        const auto count = static_cast<GLsizei>(vertices);
+        AccountTransformFeedbackPrimitives(mode, count);
+        if (instancecount == 1) {
+            DrawArrays_Backend(mode, 0, count);
+        } else {
+            DrawArraysInstanced_Backend(mode, 0, count, instancecount);
+        }
+    }
+
+    void DrawTransformFeedback(GLenum mode, GLuint id) {
+        DrawTransformFeedbackImpl(__func__, mode, id, 0, 1);
+    }
+
+    void DrawTransformFeedbackInstanced(GLenum mode, GLuint id, GLsizei instancecount) {
+        DrawTransformFeedbackImpl(__func__, mode, id, 0, instancecount);
+    }
+
+    void DrawTransformFeedbackStream(GLenum mode, GLuint id, GLuint stream) {
+        DrawTransformFeedbackImpl(__func__, mode, id, stream, 1);
+    }
+
+    void DrawTransformFeedbackStreamInstanced(GLenum mode, GLuint id, GLuint stream, GLsizei instancecount) {
+        DrawTransformFeedbackImpl(__func__, mode, id, stream, instancecount);
+    }
+
 } // namespace MobileGL::MG_Impl::GLImpl

MobileGL/MG_Impl/GLImpl/Drawing/GL_Drawing.h

@@ -13,8 +13,19 @@ namespace MobileGL::MG_Impl::GLImpl {
     /* @INSERTION_POINT:FUNCTION_DECLARATION@ */
     void BeginTransformFeedback(GLenum primitiveMode);
     void EndTransformFeedback(void);
+    void PauseTransformFeedback(void);
+    void ResumeTransformFeedback(void);
+    void GenTransformFeedbacks(GLsizei n, GLuint* ids);
+    void DeleteTransformFeedbacks(GLsizei n, const GLuint* ids);
+    void BindTransformFeedback(GLenum target, GLuint id);
+    GLboolean IsTransformFeedback(GLuint id);
+    void DrawTransformFeedback(GLenum mode, GLuint id);
+    void DrawTransformFeedbackInstanced(GLenum mode, GLuint id, GLsizei instancecount);
+    void DrawTransformFeedbackStream(GLenum mode, GLuint id, GLuint stream);
+    void DrawTransformFeedbackStreamInstanced(GLenum mode, GLuint id, GLuint stream, GLsizei instancecount);
     void DispatchCompute(GLuint numGroupsX, GLuint numGroupsY, GLuint numGroupsZ);
     void DispatchComputeIndirect(GLintptr indirect);
+    void PatchParameteri(GLenum pname, GLint value);
     void MemoryBarrier(GLbitfield barriers);
     void MemoryBarrierByRegion(GLbitfield barriers);
     void MultiDrawElementsIndirect(GLenum mode, GLenum type, const void* indirect, GLsizei drawcount, GLsizei stride);

MobileGL/MG_Impl/GLImpl/Exporting/Definitions.cpp

@@ -292,21 +292,15 @@ DECLARE_GL_FUNCTION_HEAD(void, SamplerParameterfv, GLuint sampler, GLenum pname,
 DECLARE_GL_FUNCTION_HEAD(void, GetSamplerParameteriv, GLuint sampler, GLenum pname, GLint* params) DECLARE_GL_FUNCTION_END_NO_RETURN(void, GetSamplerParameteriv, sampler, pname, params)
 DECLARE_GL_FUNCTION_HEAD(void, GetSamplerParameterfv, GLuint sampler, GLenum pname, GLfloat* params) DECLARE_GL_FUNCTION_END_NO_RETURN(void, GetSamplerParameterfv, sampler, pname, params)
 DECLARE_GL_FUNCTION_HEAD(void, VertexAttribDivisor, GLuint index, GLuint divisor) DECLARE_GL_FUNCTION_END_NO_RETURN(void, VertexAttribDivisor, index, divisor)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, BindTransformFeedback, GLenum target, GLuint id) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, BindTransformFeedback, target, id)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, DeleteTransformFeedbacks, GLsizei n, const GLuint* ids) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, DeleteTransformFeedbacks, n, ids)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, GenTransformFeedbacks, GLsizei n, GLuint* ids) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, GenTransformFeedbacks, n, ids)
-// Transform feedback objects are not implemented, so no name is ever a live object. The shared
-// stub returns (type)1, telling a probing caller that every id it invents already exists; GL_FALSE
-// is both truthful and what the spec requires for a name that was never generated.
-MOBILEGL_GL_API GLboolean glIsTransformFeedback(GLuint id) {
-    MGLOG_W("Stub function: %s(...)", __FUNCTION__);
-    return GL_FALSE;
-}
-DECLARE_GL_FUNCTION_STUB_HEAD(void, PauseTransformFeedback) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, PauseTransformFeedback)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ResumeTransformFeedback) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ResumeTransformFeedback)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, GetProgramBinary, GLuint program, GLsizei bufSize, GLsizei* length, GLenum* binaryFormat, void* binary) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, GetProgramBinary, program, bufSize, length, binaryFormat, binary)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramBinary, GLuint program, GLenum binaryFormat, const void* binary, GLsizei length) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramBinary, program, binaryFormat, binary, length)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramParameteri, GLuint program, GLenum pname, GLint value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramParameteri, program, pname, value)
+DECLARE_GL_FUNCTION_HEAD(void, BindTransformFeedback, GLenum target, GLuint id) DECLARE_GL_FUNCTION_END_NO_RETURN(void, BindTransformFeedback, target, id)
+DECLARE_GL_FUNCTION_HEAD(void, DeleteTransformFeedbacks, GLsizei n, const GLuint* ids) DECLARE_GL_FUNCTION_END_NO_RETURN(void, DeleteTransformFeedbacks, n, ids)
+DECLARE_GL_FUNCTION_HEAD(void, GenTransformFeedbacks, GLsizei n, GLuint* ids) DECLARE_GL_FUNCTION_END_NO_RETURN(void, GenTransformFeedbacks, n, ids)
+DECLARE_GL_FUNCTION_HEAD(GLboolean, IsTransformFeedback, GLuint id) DECLARE_GL_FUNCTION_END(GLboolean, IsTransformFeedback, id)
+DECLARE_GL_FUNCTION_HEAD(void, PauseTransformFeedback) DECLARE_GL_FUNCTION_END_NO_RETURN(void, PauseTransformFeedback)
+DECLARE_GL_FUNCTION_HEAD(void, ResumeTransformFeedback) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ResumeTransformFeedback)
+DECLARE_GL_FUNCTION_HEAD(void, GetProgramBinary, GLuint program, GLsizei bufSize, GLsizei* length, GLenum* binaryFormat, void* binary) DECLARE_GL_FUNCTION_END_NO_RETURN(void, GetProgramBinary, program, bufSize, length, binaryFormat, binary)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramBinary, GLuint program, GLenum binaryFormat, const void* binary, GLsizei length) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramBinary, program, binaryFormat, binary, length)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramParameteri, GLuint program, GLenum pname, GLint value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramParameteri, program, pname, value)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, InvalidateFramebuffer, GLenum target, GLsizei numAttachments, const GLenum* attachments) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, InvalidateFramebuffer, target, numAttachments, attachments)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, InvalidateSubFramebuffer, GLenum target, GLsizei numAttachments, const GLenum* attachments, GLint x, GLint y, GLsizei width, GLsizei height) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, InvalidateSubFramebuffer, target, numAttachments, attachments, x, y, width, height)
 DECLARE_GL_FUNCTION_HEAD(void, TexStorage2D, GLenum target, GLsizei levels, GLenum internalformat, GLsizei width, GLsizei height) DECLARE_GL_FUNCTION_END_NO_RETURN(void, TexStorage2D, target, levels, internalformat, width, height)
@@ -430,7 +424,7 @@ DECLARE_GL_FUNCTION_STUB_HEAD(void, GetnUniformfv, GLuint program, GLint locatio
 DECLARE_GL_FUNCTION_STUB_HEAD(void, GetnUniformiv, GLuint program, GLint location, GLsizei bufSize, GLint* params) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, GetnUniformiv, program, location, bufSize, params)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, GetnUniformuiv, GLuint program, GLint location, GLsizei bufSize, GLuint* params) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, GetnUniformuiv, program, location, bufSize, params)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, MinSampleShading, GLfloat value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, MinSampleShading, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, PatchParameteri, GLenum pname, GLint value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, PatchParameteri, pname, value)
+DECLARE_GL_FUNCTION_HEAD(void, PatchParameteri, GLenum pname, GLint value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, PatchParameteri, pname, value)
 DECLARE_GL_FUNCTION_HEAD(void, TexParameterIiv, GLenum target, GLenum pname, const GLint* params) DECLARE_GL_FUNCTION_END_NO_RETURN(void, TexParameterIiv, target, pname, params)
 DECLARE_GL_FUNCTION_HEAD(void, TexParameterIuiv, GLenum target, GLenum pname, const GLuint* params) DECLARE_GL_FUNCTION_END_NO_RETURN(void, TexParameterIuiv, target, pname, params)
 DECLARE_GL_FUNCTION_HEAD(void, GetTexParameterIiv, GLenum target, GLenum pname, GLint* params) DECLARE_GL_FUNCTION_END_NO_RETURN(void, GetTexParameterIiv, target, pname, params)
@@ -915,24 +909,24 @@ DECLARE_GL_FUNCTION_STUB_HEAD(void, ColorP4ui, GLenum type, GLuint color) DECLAR
 DECLARE_GL_FUNCTION_STUB_HEAD(void, ColorP4uiv, GLenum type, const GLuint* color) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ColorP4uiv, type, color)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, SecondaryColorP3ui, GLenum type, GLuint color) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, SecondaryColorP3ui, type, color)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, SecondaryColorP3uiv, GLenum type, const GLuint* color) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, SecondaryColorP3uiv, type, color)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, Uniform1d, GLint location, GLdouble x) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, Uniform1d, location, x)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, Uniform2d, GLint location, GLdouble x, GLdouble y) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, Uniform2d, location, x, y)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, Uniform3d, GLint location, GLdouble x, GLdouble y, GLdouble z) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, Uniform3d, location, x, y, z)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, Uniform4d, GLint location, GLdouble x, GLdouble y, GLdouble z, GLdouble w) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, Uniform4d, location, x, y, z, w)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, Uniform1dv, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, Uniform1dv, location, count, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, Uniform2dv, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, Uniform2dv, location, count, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, Uniform3dv, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, Uniform3dv, location, count, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, Uniform4dv, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, Uniform4dv, location, count, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, UniformMatrix2dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, UniformMatrix2dv, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, UniformMatrix3dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, UniformMatrix3dv, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, UniformMatrix4dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, UniformMatrix4dv, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, UniformMatrix2x3dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, UniformMatrix2x3dv, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, UniformMatrix2x4dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, UniformMatrix2x4dv, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, UniformMatrix3x2dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, UniformMatrix3x2dv, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, UniformMatrix3x4dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, UniformMatrix3x4dv, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, UniformMatrix4x2dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, UniformMatrix4x2dv, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, UniformMatrix4x3dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, UniformMatrix4x3dv, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, GetUniformdv, GLuint program, GLint location, GLdouble* params) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, GetUniformdv, program, location, params)
+DECLARE_GL_FUNCTION_HEAD(void, Uniform1d, GLint location, GLdouble x) DECLARE_GL_FUNCTION_END_NO_RETURN(void, Uniform1d, location, x)
+DECLARE_GL_FUNCTION_HEAD(void, Uniform2d, GLint location, GLdouble x, GLdouble y) DECLARE_GL_FUNCTION_END_NO_RETURN(void, Uniform2d, location, x, y)
+DECLARE_GL_FUNCTION_HEAD(void, Uniform3d, GLint location, GLdouble x, GLdouble y, GLdouble z) DECLARE_GL_FUNCTION_END_NO_RETURN(void, Uniform3d, location, x, y, z)
+DECLARE_GL_FUNCTION_HEAD(void, Uniform4d, GLint location, GLdouble x, GLdouble y, GLdouble z, GLdouble w) DECLARE_GL_FUNCTION_END_NO_RETURN(void, Uniform4d, location, x, y, z, w)
+DECLARE_GL_FUNCTION_HEAD(void, Uniform1dv, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, Uniform1dv, location, count, value)
+DECLARE_GL_FUNCTION_HEAD(void, Uniform2dv, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, Uniform2dv, location, count, value)
+DECLARE_GL_FUNCTION_HEAD(void, Uniform3dv, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, Uniform3dv, location, count, value)
+DECLARE_GL_FUNCTION_HEAD(void, Uniform4dv, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, Uniform4dv, location, count, value)
+DECLARE_GL_FUNCTION_HEAD(void, UniformMatrix2dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, UniformMatrix2dv, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, UniformMatrix3dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, UniformMatrix3dv, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, UniformMatrix4dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, UniformMatrix4dv, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, UniformMatrix2x3dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, UniformMatrix2x3dv, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, UniformMatrix2x4dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, UniformMatrix2x4dv, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, UniformMatrix3x2dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, UniformMatrix3x2dv, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, UniformMatrix3x4dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, UniformMatrix3x4dv, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, UniformMatrix4x2dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, UniformMatrix4x2dv, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, UniformMatrix4x3dv, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, UniformMatrix4x3dv, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, GetUniformdv, GLuint program, GLint location, GLdouble* params) DECLARE_GL_FUNCTION_END_NO_RETURN(void, GetUniformdv, program, location, params)
 DECLARE_GL_FUNCTION_STUB_HEAD(GLint, GetSubroutineUniformLocation, GLuint program, GLenum shadertype, const GLchar* name) DECLARE_GL_FUNCTION_STUB_END(GLint, GetSubroutineUniformLocation, program, shadertype, name)
 DECLARE_GL_FUNCTION_STUB_HEAD(GLuint, GetSubroutineIndex, GLuint program, GLenum shadertype, const GLchar* name) DECLARE_GL_FUNCTION_STUB_END(GLuint, GetSubroutineIndex, program, shadertype, name)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, GetActiveSubroutineUniformiv, GLuint program, GLenum shadertype, GLuint index, GLenum pname, GLint* values) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, GetActiveSubroutineUniformiv, program, shadertype, index, pname, values)
@@ -942,28 +936,28 @@ DECLARE_GL_FUNCTION_STUB_HEAD(void, UniformSubroutinesuiv, GLenum shadertype, GL
 DECLARE_GL_FUNCTION_STUB_HEAD(void, GetUniformSubroutineuiv, GLenum shadertype, GLint location, GLuint* params) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, GetUniformSubroutineuiv, shadertype, location, params)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, GetProgramStageiv, GLuint program, GLenum shadertype, GLenum pname, GLint* values) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, GetProgramStageiv, program, shadertype, pname, values)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, PatchParameterfv, GLenum pname, const GLfloat* values) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, PatchParameterfv, pname, values)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, DrawTransformFeedback, GLenum mode, GLuint id) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, DrawTransformFeedback, mode, id)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, DrawTransformFeedbackStream, GLenum mode, GLuint id, GLuint stream) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, DrawTransformFeedbackStream, mode, id, stream)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, BeginQueryIndexed, GLenum target, GLuint index, GLuint id) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, BeginQueryIndexed, target, index, id)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, EndQueryIndexed, GLenum target, GLuint index) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, EndQueryIndexed, target, index)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, GetQueryIndexediv, GLenum target, GLuint index, GLenum pname, GLint* params) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, GetQueryIndexediv, target, index, pname, params)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniform1d, GLuint program, GLint location, GLdouble v0) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniform1d, program, location, v0)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniform1dv, GLuint program, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniform1dv, program, location, count, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniform2d, GLuint program, GLint location, GLdouble v0, GLdouble v1) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniform2d, program, location, v0, v1)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniform2dv, GLuint program, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniform2dv, program, location, count, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniform3d, GLuint program, GLint location, GLdouble v0, GLdouble v1, GLdouble v2) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniform3d, program, location, v0, v1, v2)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniform3dv, GLuint program, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniform3dv, program, location, count, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniform4d, GLuint program, GLint location, GLdouble v0, GLdouble v1, GLdouble v2, GLdouble v3) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniform4d, program, location, v0, v1, v2, v3)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniform4dv, GLuint program, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniform4dv, program, location, count, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniformMatrix2dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniformMatrix2dv, program, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniformMatrix3dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniformMatrix3dv, program, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniformMatrix4dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniformMatrix4dv, program, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniformMatrix2x3dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniformMatrix2x3dv, program, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniformMatrix3x2dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniformMatrix3x2dv, program, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniformMatrix2x4dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniformMatrix2x4dv, program, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniformMatrix4x2dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniformMatrix4x2dv, program, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniformMatrix3x4dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniformMatrix3x4dv, program, location, count, transpose, value)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ProgramUniformMatrix4x3dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ProgramUniformMatrix4x3dv, program, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, DrawTransformFeedback, GLenum mode, GLuint id) DECLARE_GL_FUNCTION_END_NO_RETURN(void, DrawTransformFeedback, mode, id)
+DECLARE_GL_FUNCTION_HEAD(void, DrawTransformFeedbackStream, GLenum mode, GLuint id, GLuint stream) DECLARE_GL_FUNCTION_END_NO_RETURN(void, DrawTransformFeedbackStream, mode, id, stream)
+DECLARE_GL_FUNCTION_HEAD(void, BeginQueryIndexed, GLenum target, GLuint index, GLuint id) DECLARE_GL_FUNCTION_END_NO_RETURN(void, BeginQueryIndexed, target, index, id)
+DECLARE_GL_FUNCTION_HEAD(void, EndQueryIndexed, GLenum target, GLuint index) DECLARE_GL_FUNCTION_END_NO_RETURN(void, EndQueryIndexed, target, index)
+DECLARE_GL_FUNCTION_HEAD(void, GetQueryIndexediv, GLenum target, GLuint index, GLenum pname, GLint* params) DECLARE_GL_FUNCTION_END_NO_RETURN(void, GetQueryIndexediv, target, index, pname, params)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniform1d, GLuint program, GLint location, GLdouble v0) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniform1d, program, location, v0)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniform1dv, GLuint program, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniform1dv, program, location, count, value)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniform2d, GLuint program, GLint location, GLdouble v0, GLdouble v1) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniform2d, program, location, v0, v1)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniform2dv, GLuint program, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniform2dv, program, location, count, value)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniform3d, GLuint program, GLint location, GLdouble v0, GLdouble v1, GLdouble v2) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniform3d, program, location, v0, v1, v2)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniform3dv, GLuint program, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniform3dv, program, location, count, value)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniform4d, GLuint program, GLint location, GLdouble v0, GLdouble v1, GLdouble v2, GLdouble v3) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniform4d, program, location, v0, v1, v2, v3)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniform4dv, GLuint program, GLint location, GLsizei count, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniform4dv, program, location, count, value)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniformMatrix2dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniformMatrix2dv, program, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniformMatrix3dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniformMatrix3dv, program, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniformMatrix4dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniformMatrix4dv, program, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniformMatrix2x3dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniformMatrix2x3dv, program, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniformMatrix3x2dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniformMatrix3x2dv, program, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniformMatrix2x4dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniformMatrix2x4dv, program, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniformMatrix4x2dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniformMatrix4x2dv, program, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniformMatrix3x4dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniformMatrix3x4dv, program, location, count, transpose, value)
+DECLARE_GL_FUNCTION_HEAD(void, ProgramUniformMatrix4x3dv, GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProgramUniformMatrix4x3dv, program, location, count, transpose, value)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, VertexAttribL1d, GLuint index, GLdouble x) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, VertexAttribL1d, index, x)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, VertexAttribL2d, GLuint index, GLdouble x, GLdouble y) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, VertexAttribL2d, index, x, y)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, VertexAttribL3d, GLuint index, GLdouble x, GLdouble y, GLdouble z) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, VertexAttribL3d, index, x, y, z)
@@ -988,8 +982,8 @@ DECLARE_GL_FUNCTION_HEAD(void, DrawArraysInstancedBaseInstance, GLenum mode, GLi
 DECLARE_GL_FUNCTION_HEAD(void, DrawElementsInstancedBaseInstance, GLenum mode, GLsizei count, GLenum type, const void* indices, GLsizei instancecount, GLuint baseinstance) DECLARE_GL_FUNCTION_END_NO_RETURN(void, DrawElementsInstancedBaseInstance, mode, count, type, indices, instancecount, baseinstance)
 DECLARE_GL_FUNCTION_HEAD(void, DrawElementsInstancedBaseVertexBaseInstance, GLenum mode, GLsizei count, GLenum type, const void* indices, GLsizei instancecount, GLint basevertex, GLuint baseinstance) DECLARE_GL_FUNCTION_END_NO_RETURN(void, DrawElementsInstancedBaseVertexBaseInstance, mode, count, type, indices, instancecount, basevertex, baseinstance)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, GetActiveAtomicCounterBufferiv, GLuint program, GLuint bufferIndex, GLenum pname, GLint* params) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, GetActiveAtomicCounterBufferiv, program, bufferIndex, pname, params)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, DrawTransformFeedbackInstanced, GLenum mode, GLuint id, GLsizei instancecount) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, DrawTransformFeedbackInstanced, mode, id, instancecount)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, DrawTransformFeedbackStreamInstanced, GLenum mode, GLuint id, GLuint stream, GLsizei instancecount) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, DrawTransformFeedbackStreamInstanced, mode, id, stream, instancecount)
+DECLARE_GL_FUNCTION_HEAD(void, DrawTransformFeedbackInstanced, GLenum mode, GLuint id, GLsizei instancecount) DECLARE_GL_FUNCTION_END_NO_RETURN(void, DrawTransformFeedbackInstanced, mode, id, instancecount)
+DECLARE_GL_FUNCTION_HEAD(void, DrawTransformFeedbackStreamInstanced, GLenum mode, GLuint id, GLuint stream, GLsizei instancecount) DECLARE_GL_FUNCTION_END_NO_RETURN(void, DrawTransformFeedbackStreamInstanced, mode, id, stream, instancecount)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, ClearBufferData, GLenum target, GLenum internalformat, GLenum format, GLenum type, const void* data) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ClearBufferData, target, internalformat, format, type, data)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, ClearBufferSubData, GLenum target, GLenum internalformat, GLintptr offset, GLsizeiptr size, GLenum format, GLenum type, const void* data) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ClearBufferSubData, target, internalformat, offset, size, format, type, data)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, GetInternalformati64v, GLenum target, GLenum internalformat, GLenum pname, GLsizei count, GLint64* params) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, GetInternalformati64v, target, internalformat, pname, count, params)

MobileGL/MG_Impl/GLImpl/Getter/GL_Getter.cpp

@@ -1030,6 +1030,11 @@ namespace MobileGL::MG_Impl::GLImpl {
             *params = obj ? static_cast<GLint>(obj->GetExternalIndex()) : 0;
             return;
         }
+        case GL_DRAW_INDIRECT_BUFFER_BINDING: {
+            auto& obj = MG_State::pGLContext->GetBufferBindingSlot(BufferTarget::DrawIndirect).GetBoundObject();
+            *params = obj ? static_cast<GLint>(obj->GetExternalIndex()) : 0;
+            return;
+        }
         case GL_MAX_DEBUG_GROUP_STACK_DEPTH:
             *params = 0; // debug-group entrypoints are stubbed
             return;
@@ -1912,6 +1917,21 @@ namespace MobileGL::MG_Impl::GLImpl {
         case GL_MAX_SAMPLE_MASK_WORDS:
             *params = dynamicParameters.MaxSampleMaskWords;
             break;
+        case GL_PATCH_VERTICES:
+            *params = static_cast<GLint>(MG_State::pGLContext->GetPatchVertices());
+            break;
+        case GL_MAX_PATCH_VERTICES:
+            *params = dynamicParameters.MaxPatchVertices;
+            break;
+        case GL_MAX_TESS_GEN_LEVEL:
+            *params = dynamicParameters.MaxTessGenLevel;
+            break;
+        case GL_MIN_PROGRAM_TEXTURE_GATHER_OFFSET:
+            *params = dynamicParameters.MinProgramTextureGatherOffset;
+            break;
+        case GL_MAX_PROGRAM_TEXTURE_GATHER_OFFSET:
+            *params = dynamicParameters.MaxProgramTextureGatherOffset;
+            break;
         case GL_MAX_SHADER_STORAGE_BUFFER_BINDINGS:
             *params = static_cast<GLint>(GetIndexedBufferQueryPointCount(BufferTarget::ShaderStorage));
             break;
@@ -1941,7 +1961,10 @@ namespace MobileGL::MG_Impl::GLImpl {
             *params = MG_State::pGLContext->IsTransformFeedbackActive() ? 1 : 0;
             break;
         case GL_TRANSFORM_FEEDBACK_PAUSED:
-            *params = 0;
+            *params = MG_State::pGLContext->IsTransformFeedbackPaused() ? 1 : 0;
+            break;
+        case GL_TRANSFORM_FEEDBACK_BINDING:
+            *params = static_cast<GLint>(MG_State::pGLContext->GetBoundTransformFeedbackName());
             break;
         case GL_MAX_TEXTURE_IMAGE_UNITS:
             *params = dynamicParameters.MaxTextureImageUnits;

MobileGL/MG_Impl/GLImpl/Program/GL_Program.cpp

@@ -8,6 +8,8 @@
 
 #include "GL_Program.h"
 #include "Config.h"
+#include <cmath>
+#include <limits>
 #include <MG_Impl/GLImpl/VertexArray/Validators.h>
 #include <MG_State/GLState/Core.h>
 #include <MG_Util/Converters/GLToStr/GLEnumConverter.h>
@@ -325,11 +327,16 @@ namespace MobileGL::MG_Impl::GLImpl {
     }
 
     void DeleteProgram_State(GLuint program) {
+        // "If program is zero, it is silently ignored" (GL 4.6 core 7.3) - unlike every
+        // other program entry point, where 0 is a name GL never handed out.
+        if (program == 0) return;
         if (!CheckProgramNameValidity(program)) return;
         MG_State::pGLContext->MarkProgramForDeletion(program);
     }
 
     void DeleteShader_State(GLuint shader) {
+        // Same silent-zero rule as glDeleteProgram (GL 4.6 core 7.1).
+        if (shader == 0) return;
         if (!CheckShaderNameValidity(shader)) return;
         MG_State::pGLContext->MarkShaderForDeletion(shader);
     }
@@ -643,6 +650,13 @@ namespace MobileGL::MG_Impl::GLImpl {
         }
 
         case GL_PROGRAM_BINARY_LENGTH:
+            // No program binary format is exposed, so a program never has a retrievable
+            // binary and its length is zero (ARB_get_program_binary).
+            *params = 0;
+            break;
+        case GL_PROGRAM_BINARY_RETRIEVABLE_HINT:
+            *params = programObject->GetBinaryRetrievableHint() ? GL_TRUE : GL_FALSE;
+            break;
 
         case GL_GEOMETRY_VERTICES_OUT:
         case GL_GEOMETRY_INPUT_TYPE:
@@ -818,7 +832,8 @@ namespace MobileGL::MG_Impl::GLImpl {
         }
 
         if constexpr (std::is_same_v<T, GLfloat>) {
-            if (ttype->isMatrix() && ttype->getMatrixCols() == 3) {
+            if (ttype->getBasicType() != glslang::EbtDouble && ttype->isMatrix() &&
+                ttype->getMatrixCols() == 3) {
                 auto* pBase = pUBO + offset;
                 for (int i = 0; i < ttype->getMatrixRows(); i++) {
                     Memcpy(reinterpret_cast<char*>(params) + ttype->getMatrixCols() * sizeof(GLfloat) * i,
@@ -828,9 +843,46 @@ namespace MobileGL::MG_Impl::GLImpl {
             }
         }
 
+        // A double-precision uniform is the one case where the stored component type can
+        // differ from the queried one for a non-opaque uniform, and the difference is not
+        // just a reinterpretation: it is twice as wide, so a raw copy would overrun the
+        // caller's buffer as well as return nonsense. Read component by component and let
+        // GL's conversion rules (7.6: round to nearest for the integer queries) apply.
+        if (ttype->getBasicType() == glslang::EbtDouble) {
+            const Int columns = ttype->isMatrix() ? ttype->getMatrixCols() : 1;
+            const Int rows = ttype->isMatrix() ? ttype->getMatrixRows()
+                                               : (ttype->isVector() ? ttype->getVectorSize() : 1);
+            // The slot the linker handed out is exactly `columns` columns wide, so it also
+            // states the column stride - which for a double matrix is not a float's 16 bytes.
+            const SizeT columnStride = columns > 0 ? size / static_cast<SizeT>(columns) : size;
+            for (Int column = 0; column < columns; ++column) {
+                for (Int row = 0; row < rows; ++row) {
+                    GLdouble component = 0.0;
+                    Memcpy(&component, pUBO + offset + column * columnStride + row * sizeof(GLdouble),
+                           sizeof(component));
+                    if constexpr (std::is_integral_v<T>) {
+                        // Rounded to the nearest integer and clamped into the queried type's
+                        // range, so a negative double read through glGetUniformuiv is 0
+                        // rather than its two's complement.
+                        const GLdouble rounded = std::nearbyint(component);
+                        const GLdouble lowest = static_cast<GLdouble>(std::numeric_limits<T>::lowest());
+                        const GLdouble highest = static_cast<GLdouble>(std::numeric_limits<T>::max());
+                        params[column * rows + row] = static_cast<T>(std::clamp(rounded, lowest, highest));
+                    } else {
+                        params[column * rows + row] = static_cast<T>(component);
+                    }
+                }
+            }
+            return;
+        }
+
         Memcpy(params, pUBO + offset, size);
     }
 
+    void GetUniformdv_State(GLuint program, GLint location, GLdouble* params) {
+        GetUniformScalar_State(program, location, params);
+    }
+
     void GetUniformfv_State(GLuint program, GLint location, GLfloat* params) {
         GetUniformScalar_State(program, location, params);
     }
@@ -915,9 +967,11 @@ namespace MobileGL::MG_Impl::GLImpl {
     void UseProgram_State(GLuint program) {
         MGLOG_D("UseProgram_State: program=%u", program);
 
-        // GL 3.3 core 2.11.3: the program in use may not change while transform
-        // feedback is active (there is no pause in 3.3).
-        if (MG_State::pGLContext->IsTransformFeedbackActive()) {
+        // The program in use may not change while transform feedback is active - unless
+        // the capture is paused, which is exactly what ARB_transform_feedback2 added the
+        // pause for (GL 4.6 core 7.3).
+        if (MG_State::pGLContext->IsTransformFeedbackActive() &&
+            !MG_State::pGLContext->IsTransformFeedbackPaused()) {
             MG_State::pGLContext->RecordError(
                 ErrorCode::InvalidOperation,
                 MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
@@ -1047,6 +1101,38 @@ namespace MobileGL::MG_Impl::GLImpl {
         }
     }
 
+    // glUniform*d / glUniformMatrix*dv. The vector forms need nothing beyond the shared
+    // upload template - it is already typed on the component - but a matrix does: the
+    // column stride the linker used for a double matrix is not the 16 bytes a float one
+    // gets. It is not guessed here; the slot the uniform was given is exactly `columns`
+    // columns wide, so dividing states the stride the rest of the pipeline agreed on.
+    template <typename Program>
+    void UniformMatrixdv_Object(Program& programObject, GLint location, GLsizei count, GLboolean transpose,
+                                const GLdouble* value, Int columns, Int rows) {
+        const SizeT slotSize = programObject.GetUniformSizesInBytes(location);
+        const SizeT columnStride = columns > 0 ? slotSize / static_cast<SizeT>(columns) : slotSize;
+        const SizeT componentCount = static_cast<SizeT>(columns) * static_cast<SizeT>(rows);
+        Vector<GLdouble> column(static_cast<SizeT>(rows));
+        for (GLint matrix = 0; matrix < count; ++matrix) {
+            if (matrix > 0 && !programObject.UniformLocationsAliasSameUniform(location, location + matrix)) break;
+            if (!programObject.IsValidUniformLocation(location + matrix)) {
+                RecordInvalidUniformLocationError(__func__, location + matrix, "the current program object");
+                return;
+            }
+            const GLdouble* source = value + matrix * componentCount;
+            for (Int c = 0; c < columns; ++c) {
+                for (Int r = 0; r < rows; ++r) {
+                    column[r] = transpose == GL_TRUE ? source[r * columns + c] : source[c * rows + r];
+                }
+                Uniform_State<1>(programObject, location + matrix, column.data(), c * columnStride);
+                for (Int r = 1; r < rows; ++r) {
+                    Uniform_State<1>(programObject, location + matrix, column.data() + r,
+                                     c * columnStride + r * sizeof(GLdouble));
+                }
+            }
+        }
+    }
+
     // Helper function to transpose a 2x2 matrix
     void TransposeMatrix2x2(const GLfloat* input, GLfloat* output) {
         // Input matrix is in column-major order (OpenGL default)
@@ -1855,6 +1941,312 @@ namespace MobileGL::MG_Impl::GLImpl {
         GLuint v[] = {v0, v1, v2, v3};
         Uniform4uiv(location, 1, v);
     }
+    void Uniform1d(GLint location, GLdouble v0) {
+        const GLdouble v[] = {v0};
+        Uniformv_State<1>(location, 1, v);
+    }
+
+    void Uniform1dv(GLint location, GLsizei count, const GLdouble* value) {
+        Uniformv_State<1>(location, count, value);
+    }
+
+    void ProgramUniform1d(GLuint program, GLint location, GLdouble v0) {
+        const GLdouble v[] = {v0};
+        ProgramUniformv_State<1>(program, location, 1, v);
+    }
+
+    void ProgramUniform1dv(GLuint program, GLint location, GLsizei count, const GLdouble* value) {
+        ProgramUniformv_State<1>(program, location, count, value);
+    }
+    void Uniform2d(GLint location, GLdouble v0, GLdouble v1) {
+        const GLdouble v[] = {v0, v1};
+        Uniformv_State<2>(location, 1, v);
+    }
+
+    void Uniform2dv(GLint location, GLsizei count, const GLdouble* value) {
+        Uniformv_State<2>(location, count, value);
+    }
+
+    void ProgramUniform2d(GLuint program, GLint location, GLdouble v0, GLdouble v1) {
+        const GLdouble v[] = {v0, v1};
+        ProgramUniformv_State<2>(program, location, 1, v);
+    }
+
+    void ProgramUniform2dv(GLuint program, GLint location, GLsizei count, const GLdouble* value) {
+        ProgramUniformv_State<2>(program, location, count, value);
+    }
+    void Uniform3d(GLint location, GLdouble v0, GLdouble v1, GLdouble v2) {
+        const GLdouble v[] = {v0, v1, v2};
+        Uniformv_State<3>(location, 1, v);
+    }
+
+    void Uniform3dv(GLint location, GLsizei count, const GLdouble* value) {
+        Uniformv_State<3>(location, count, value);
+    }
+
+    void ProgramUniform3d(GLuint program, GLint location, GLdouble v0, GLdouble v1, GLdouble v2) {
+        const GLdouble v[] = {v0, v1, v2};
+        ProgramUniformv_State<3>(program, location, 1, v);
+    }
+
+    void ProgramUniform3dv(GLuint program, GLint location, GLsizei count, const GLdouble* value) {
+        ProgramUniformv_State<3>(program, location, count, value);
+    }
+    void Uniform4d(GLint location, GLdouble v0, GLdouble v1, GLdouble v2, GLdouble v3) {
+        const GLdouble v[] = {v0, v1, v2, v3};
+        Uniformv_State<4>(location, 1, v);
+    }
+
+    void Uniform4dv(GLint location, GLsizei count, const GLdouble* value) {
+        Uniformv_State<4>(location, count, value);
+    }
+
+    void ProgramUniform4d(GLuint program, GLint location, GLdouble v0, GLdouble v1, GLdouble v2, GLdouble v3) {
+        const GLdouble v[] = {v0, v1, v2, v3};
+        ProgramUniformv_State<4>(program, location, 1, v);
+    }
+
+    void ProgramUniform4dv(GLuint program, GLint location, GLsizei count, const GLdouble* value) {
+        ProgramUniformv_State<4>(program, location, count, value);
+    }
+    void UniformMatrix2dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = MG_State::pGLContext->GetCurrentProgram();
+        if (programObject == nullptr) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "There is no current program object."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 2, 2);
+    }
+
+    void ProgramUniformMatrix2dv(GLuint program, GLint location, GLsizei count, GLboolean transpose,
+                                      const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = TryToGetProgramObject(program);
+        if (!programObject) return;
+        if (!programObject->GetLinkStatus()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             "program " + std::to_string(program) + " is not linked."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 2, 2);
+    }
+    void UniformMatrix3dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = MG_State::pGLContext->GetCurrentProgram();
+        if (programObject == nullptr) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "There is no current program object."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 3, 3);
+    }
+
+    void ProgramUniformMatrix3dv(GLuint program, GLint location, GLsizei count, GLboolean transpose,
+                                      const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = TryToGetProgramObject(program);
+        if (!programObject) return;
+        if (!programObject->GetLinkStatus()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             "program " + std::to_string(program) + " is not linked."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 3, 3);
+    }
+    void UniformMatrix4dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = MG_State::pGLContext->GetCurrentProgram();
+        if (programObject == nullptr) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "There is no current program object."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 4, 4);
+    }
+
+    void ProgramUniformMatrix4dv(GLuint program, GLint location, GLsizei count, GLboolean transpose,
+                                      const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = TryToGetProgramObject(program);
+        if (!programObject) return;
+        if (!programObject->GetLinkStatus()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             "program " + std::to_string(program) + " is not linked."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 4, 4);
+    }
+    void UniformMatrix2x3dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = MG_State::pGLContext->GetCurrentProgram();
+        if (programObject == nullptr) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "There is no current program object."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 2, 3);
+    }
+
+    void ProgramUniformMatrix2x3dv(GLuint program, GLint location, GLsizei count, GLboolean transpose,
+                                      const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = TryToGetProgramObject(program);
+        if (!programObject) return;
+        if (!programObject->GetLinkStatus()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             "program " + std::to_string(program) + " is not linked."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 2, 3);
+    }
+    void UniformMatrix2x4dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = MG_State::pGLContext->GetCurrentProgram();
+        if (programObject == nullptr) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "There is no current program object."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 2, 4);
+    }
+
+    void ProgramUniformMatrix2x4dv(GLuint program, GLint location, GLsizei count, GLboolean transpose,
+                                      const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = TryToGetProgramObject(program);
+        if (!programObject) return;
+        if (!programObject->GetLinkStatus()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             "program " + std::to_string(program) + " is not linked."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 2, 4);
+    }
+    void UniformMatrix3x2dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = MG_State::pGLContext->GetCurrentProgram();
+        if (programObject == nullptr) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "There is no current program object."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 3, 2);
+    }
+
+    void ProgramUniformMatrix3x2dv(GLuint program, GLint location, GLsizei count, GLboolean transpose,
+                                      const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = TryToGetProgramObject(program);
+        if (!programObject) return;
+        if (!programObject->GetLinkStatus()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             "program " + std::to_string(program) + " is not linked."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 3, 2);
+    }
+    void UniformMatrix3x4dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = MG_State::pGLContext->GetCurrentProgram();
+        if (programObject == nullptr) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "There is no current program object."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 3, 4);
+    }
+
+    void ProgramUniformMatrix3x4dv(GLuint program, GLint location, GLsizei count, GLboolean transpose,
+                                      const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = TryToGetProgramObject(program);
+        if (!programObject) return;
+        if (!programObject->GetLinkStatus()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             "program " + std::to_string(program) + " is not linked."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 3, 4);
+    }
+    void UniformMatrix4x2dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = MG_State::pGLContext->GetCurrentProgram();
+        if (programObject == nullptr) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "There is no current program object."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 4, 2);
+    }
+
+    void ProgramUniformMatrix4x2dv(GLuint program, GLint location, GLsizei count, GLboolean transpose,
+                                      const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = TryToGetProgramObject(program);
+        if (!programObject) return;
+        if (!programObject->GetLinkStatus()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             "program " + std::to_string(program) + " is not linked."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 4, 2);
+    }
+    void UniformMatrix4x3dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = MG_State::pGLContext->GetCurrentProgram();
+        if (programObject == nullptr) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "There is no current program object."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 4, 3);
+    }
+
+    void ProgramUniformMatrix4x3dv(GLuint program, GLint location, GLsizei count, GLboolean transpose,
+                                      const GLdouble* value) {
+        if (location == -1) return;
+        auto& programObject = TryToGetProgramObject(program);
+        if (!programObject) return;
+        if (!programObject->GetLinkStatus()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             "program " + std::to_string(program) + " is not linked."));
+            return;
+        }
+        UniformMatrixdv_Object(*programObject, location, count, transpose, value, 4, 3);
+    }
+    void GetUniformdv(GLuint program, GLint location, GLdouble* params) {
+        GetUniformdv_State(program, location, params);
+    }
+
     void Uniform1fv(GLint location, GLsizei count, const GLfloat* value) {
         Uniform1fv_State(location, count, value);
     }
@@ -2251,6 +2643,65 @@ namespace MobileGL::MG_Impl::GLImpl {
         ValidateProgram_State(program);
     }
 
+    // ARB_get_program_binary with no supported binary format (GL_NUM_PROGRAM_BINARY_FORMATS
+    // is 0, which the extension explicitly allows). The three entry points below are what an
+    // application - and dEQP's function loader - reach through the extension; without it
+    // glProgramParameteri is not exposed in a 4.0 context at all.
+    void ProgramParameteri(GLuint program, GLenum pname, GLint value) {
+        auto& programObject = TryToGetProgramObject(program);
+        if (!programObject) return;
+        if (pname != GL_PROGRAM_BINARY_RETRIEVABLE_HINT) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidEnum,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "pname is not an accepted value."));
+            return;
+        }
+        if (value != GL_TRUE && value != GL_FALSE) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidValue,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "value must be GL_TRUE or GL_FALSE."));
+            return;
+        }
+        programObject->SetBinaryRetrievableHint(value == GL_TRUE);
+    }
+
+    void GetProgramBinary(GLuint program, GLsizei bufSize, GLsizei* length, GLenum* binaryFormat, void* binary) {
+        (void)binaryFormat;
+        (void)binary;
+        auto& programObject = TryToGetProgramObject(program);
+        if (!programObject) return;
+        if (bufSize < 0) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidValue,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "bufSize must be non-negative."));
+            return;
+        }
+        if (length) *length = 0;
+        // GL_PROGRAM_BINARY_LENGTH is always zero here, which the spec makes an error to ask for.
+        MG_State::pGLContext->RecordError(
+            ErrorCode::InvalidOperation,
+            MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "The program has no retrievable binary."));
+    }
+
+    void ProgramBinary(GLuint program, GLenum binaryFormat, const void* binary, GLsizei length) {
+        (void)binaryFormat;
+        (void)binary;
+        auto& programObject = TryToGetProgramObject(program);
+        if (!programObject) return;
+        if (length < 0) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidValue,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "length must be non-negative."));
+            return;
+        }
+        // No format is supported, so every binary is rejected - and the program's link status
+        // has to read FALSE afterwards.
+        programObject->MarkLinkFailedByProgramBinary();
+        MG_State::pGLContext->RecordError(
+            ErrorCode::InvalidEnum,
+            MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "binaryFormat is not a supported format."));
+    }
+
     void TransformFeedbackVaryings(GLuint program, GLsizei count, const GLchar* const* varyings, GLenum bufferMode) {
         auto& programObject = TryToGetProgramObject(program);
         if (!programObject) return;
@@ -2279,6 +2730,31 @@ namespace MobileGL::MG_Impl::GLImpl {
         for (GLsizei i = 0; i < count; ++i) {
             names.emplace_back(varyings != nullptr && varyings[i] != nullptr ? varyings[i] : "");
         }
+        // ARB_transform_feedback3's special names only mean anything in an interleaved
+        // capture, and gl_NextBuffer cannot advance past the last capture buffer.
+        constexpr Uint maxTransformFeedbackBuffers = 4;
+        Uint nextBufferCount = 0;
+        for (const String& name : names) {
+            const Bool isNextBuffer = name == "gl_NextBuffer";
+            const Bool isSkipComponents = name.size() == 18 && name.compare(0, 17, "gl_SkipComponents") == 0 &&
+                                          name[17] >= '1' && name[17] <= '4';
+            if (!isNextBuffer && !isSkipComponents) continue;
+            if (bufferMode != GL_INTERLEAVED_ATTRIBS) {
+                MG_State::pGLContext->RecordError(
+                    ErrorCode::InvalidOperation,
+                    MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                                 "'" + name + "' requires GL_INTERLEAVED_ATTRIBS."));
+                return;
+            }
+            if (isNextBuffer && ++nextBufferCount >= maxTransformFeedbackBuffers) {
+                MG_State::pGLContext->RecordError(
+                    ErrorCode::InvalidOperation,
+                    MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                                 "More gl_NextBuffer entries than "
+                                                 "GL_MAX_TRANSFORM_FEEDBACK_BUFFERS allows."));
+                return;
+            }
+        }
         programObject->SetTransformFeedbackVaryings(Move(names), bufferMode);
     }
 

MobileGL/MG_Impl/GLImpl/Program/GL_Program.h

@@ -137,7 +137,45 @@ namespace MobileGL::MG_Impl::GLImpl {
     GLint GetProgramResourceLocation(GLuint program, GLenum programInterface, const GLchar* name);
     GLint GetProgramResourceLocationIndex(GLuint program, GLenum programInterface, const GLchar* name);
     void ShaderStorageBlockBinding(GLuint program, GLuint storageBlockIndex, GLuint storageBlockBinding);
+    void Uniform1d(GLint location, GLdouble v0);
+    void Uniform1dv(GLint location, GLsizei count, const GLdouble* value);
+    void ProgramUniform1d(GLuint program, GLint location, GLdouble v0);
+    void ProgramUniform1dv(GLuint program, GLint location, GLsizei count, const GLdouble* value);
+    void Uniform2d(GLint location, GLdouble v0, GLdouble v1);
+    void Uniform2dv(GLint location, GLsizei count, const GLdouble* value);
+    void ProgramUniform2d(GLuint program, GLint location, GLdouble v0, GLdouble v1);
+    void ProgramUniform2dv(GLuint program, GLint location, GLsizei count, const GLdouble* value);
+    void Uniform3d(GLint location, GLdouble v0, GLdouble v1, GLdouble v2);
+    void Uniform3dv(GLint location, GLsizei count, const GLdouble* value);
+    void ProgramUniform3d(GLuint program, GLint location, GLdouble v0, GLdouble v1, GLdouble v2);
+    void ProgramUniform3dv(GLuint program, GLint location, GLsizei count, const GLdouble* value);
+    void Uniform4d(GLint location, GLdouble v0, GLdouble v1, GLdouble v2, GLdouble v3);
+    void Uniform4dv(GLint location, GLsizei count, const GLdouble* value);
+    void ProgramUniform4d(GLuint program, GLint location, GLdouble v0, GLdouble v1, GLdouble v2, GLdouble v3);
+    void ProgramUniform4dv(GLuint program, GLint location, GLsizei count, const GLdouble* value);
+    void UniformMatrix2dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void ProgramUniformMatrix2dv(GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void UniformMatrix3dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void ProgramUniformMatrix3dv(GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void UniformMatrix4dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void ProgramUniformMatrix4dv(GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void UniformMatrix2x3dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void ProgramUniformMatrix2x3dv(GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void UniformMatrix2x4dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void ProgramUniformMatrix2x4dv(GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void UniformMatrix3x2dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void ProgramUniformMatrix3x2dv(GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void UniformMatrix3x4dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void ProgramUniformMatrix3x4dv(GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void UniformMatrix4x2dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void ProgramUniformMatrix4x2dv(GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void UniformMatrix4x3dv(GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void ProgramUniformMatrix4x3dv(GLuint program, GLint location, GLsizei count, GLboolean transpose, const GLdouble* value);
+    void GetUniformdv(GLuint program, GLint location, GLdouble* params);
     void ValidateProgram(GLuint program);
+    void ProgramParameteri(GLuint program, GLenum pname, GLint value);
+    void GetProgramBinary(GLuint program, GLsizei bufSize, GLsizei* length, GLenum* binaryFormat, void* binary);
+    void ProgramBinary(GLuint program, GLenum binaryFormat, const void* binary, GLsizei length);
     void TransformFeedbackVaryings(GLuint program, GLsizei count, const GLchar* const* varyings, GLenum bufferMode);
     void GetTransformFeedbackVarying(GLuint program, GLuint index, GLsizei bufSize, GLsizei* length, GLsizei* size,
                                      GLenum* type, GLchar* name);

MobileGL/MG_Impl/GLImpl/Query/GL_Query.cpp

@@ -7,6 +7,7 @@
 // End of Source File Header
 
 #include "GL_Query.h"
+#include "../Getter/GL_Getter.h"
 #include <Config.h>
 #include <MG_Backend/BackendObjects.h>
 #include <MG_State/GLState/Core.h>
@@ -466,4 +467,42 @@ namespace MobileGL::MG_Impl::GLImpl {
         }
         *params = static_cast<GLuint64>(value);
     }
+
+    namespace {
+        // The indexed query entry points differ from the plain ones only in the vertex
+        // stream they address (GL 4.6 core 4.2.1): index must be below GL_MAX_VERTEX_STREAMS
+        // for the two transform feedback targets and zero for every other target. With a
+        // single vertex stream both bounds are 1, so a valid call is always index 0 and
+        // forwards to the unindexed implementation.
+        Bool ValidateQueryStreamIndex(const char* function, GLenum target, GLuint index) {
+            const Bool perStreamTarget =
+                target == GL_PRIMITIVES_GENERATED || target == GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN;
+            GLint maxVertexStreams = 1;
+            if (perStreamTarget) {
+                GetIntegerv(GL_MAX_VERTEX_STREAMS, &maxVertexStreams);
+            }
+            if (index < static_cast<GLuint>(std::max(maxVertexStreams, 1))) {
+                return true;
+            }
+            RecordQueryError(ErrorCode::InvalidValue, function,
+                             perStreamTarget ? "index is not less than GL_MAX_VERTEX_STREAMS."
+                                             : "index must be zero for this query target.");
+            return false;
+        }
+    } // namespace
+
+    void BeginQueryIndexed(GLenum target, GLuint index, GLuint id) {
+        if (!ValidateQueryStreamIndex(__FUNCTION__, target, index)) return;
+        BeginQuery(target, id);
+    }
+
+    void EndQueryIndexed(GLenum target, GLuint index) {
+        if (!ValidateQueryStreamIndex(__FUNCTION__, target, index)) return;
+        EndQuery(target);
+    }
+
+    void GetQueryIndexediv(GLenum target, GLuint index, GLenum pname, GLint* params) {
+        if (!ValidateQueryStreamIndex(__FUNCTION__, target, index)) return;
+        GetQueryiv(target, pname, params);
+    }
 } // namespace MobileGL::MG_Impl::GLImpl

MobileGL/MG_Impl/GLImpl/Query/GL_Query.h

@@ -16,6 +16,9 @@ namespace MobileGL::MG_Impl::GLImpl {
     void BeginQuery(GLenum target, GLuint id);
     void EndQuery(GLenum target);
     void GetQueryiv(GLenum target, GLenum pname, GLint* params);
+    void BeginQueryIndexed(GLenum target, GLuint index, GLuint id);
+    void EndQueryIndexed(GLenum target, GLuint index);
+    void GetQueryIndexediv(GLenum target, GLuint index, GLenum pname, GLint* params);
     void GetQueryObjectiv(GLuint id, GLenum pname, GLint* params);
     void GetQueryObjectuiv(GLuint id, GLenum pname, GLuint* params);
     void GetQueryObjecti64v(GLuint id, GLenum pname, GLint64* params);

MobileGL/MG_State/GLState/BufferState/BufferObject.cpp

@@ -174,6 +174,21 @@ namespace MobileGL::MG_State::GLState {
         ++m_changeSerial;
     }
 
+    void BufferObject::MarkGpuWritten() {
+        m_gpuWritePending = true;
+    }
+
+    void BufferObject::SyncGpuWrites() {
+        if (!m_gpuWritePending) return;
+        // Cleared unconditionally: without a readback op the shadow can never catch up,
+        // and retrying on every subsequent read would only repeat the same no-op.
+        m_gpuWritePending = false;
+        if (m_size == 0 || g_bufferBackendOps == nullptr || g_bufferBackendOps->ReadbackFromGpu == nullptr) {
+            return;
+        }
+        g_bufferBackendOps->ReadbackFromGpu(*this);
+    }
+
     void BufferObject::UploadSubData(DataPtr data, SizeT atOffset) {
         MOBILEGL_ASSERT(!m_isMapped || (m_mappingAccess & BufferMappingAccessBit::Persistent),
                         "Cannot upload sub data while buffer is non-persistently mapped.");
@@ -204,11 +219,13 @@ namespace MobileGL::MG_State::GLState {
                         "Destination buffer copy out of bounds: dstOffset (%zu) + size (%zu) > m_size (%zu)", dstOffset,
                         size, m_size);
 
+        src->SyncGpuWrites();
         Memcpy(m_resource.Bytes() + dstOffset, src->m_resource.Bytes() + srcOffset, size);
         NotifyContentWrite(dstOffset, size);
     }
 
     void* BufferObject::AcquireMemory(Bool markMapped, Bool read, Bool write) {
+        SyncGpuWrites();
         if (markMapped) {
             m_isMapped = true;
             m_mappingAccess = (read ? BufferMappingAccessBit::Read : BufferMappingAccessBit::Null) |
@@ -250,6 +267,10 @@ namespace MobileGL::MG_State::GLState {
         MOBILEGL_ASSERT(range.end <= m_size && range.start <= range.end,
                         "AcquireMemoryRange out of bounds: range (%zu, %zu) exceeds m_size (%zu)", range.start,
                         range.end, m_size);
+        // The app is about to look at the bytes; a shader may have rewritten them since
+        // the shadow was last authoritative. Also needed for a write map without an
+        // invalidate bit, whose staging copy is seeded from the shadow.
+        SyncGpuWrites();
         m_isMapped = true;
         m_mappingAccess = access;
         m_mappedRange = range;

MobileGL/MG_State/GLState/BufferState/BufferObject.h

@@ -99,6 +99,13 @@ namespace MobileGL {
             // Must be idempotent: a second call for an already-backed buffer returns the
             // same base pointer.
             void* (*AcquirePersistentMap)(BufferObject& bufferObject) = nullptr;
+            // Pulls the backend's current contents for the whole buffer into the shadow
+            // (through WritebackFromBackend). Only ever called for a buffer the GPU may
+            // have written behind the frontend's back - a shader storage or atomic counter
+            // binding of a draw or dispatch - because nothing else can desynchronise the
+            // shadow. Backends that cannot read their storage back leave this null; the
+            // shadow then keeps its pre-dispatch bytes, which is the old behaviour.
+            void (*ReadbackFromGpu)(BufferObject& bufferObject) = nullptr;
         };
 
         // Registered by the active backend at init, cleared at shutdown.
@@ -149,6 +156,16 @@ namespace MobileGL {
             // backend op: the backend storage already holds these bytes.
             void WritebackFromBackend(DataPtr data, SizeT atOffset);
 
+            // A draw or dispatch just ran with this buffer bound where a shader can write
+            // it (shader storage / atomic counter). The next read has to reconcile with
+            // that: pull the bytes back, or - when the shadow already IS coherent GPU
+            // memory - wait for the work that wrote them to retire. Which of the two is
+            // the backend's business; the flag only says a GPU write is outstanding.
+            void MarkGpuWritten();
+            // Refreshes the shadow from the backend when a GPU write is outstanding. Called
+            // from every path that reads the shadow on the app's behalf.
+            void SyncGpuWrites();
+
             Bool IsMapped() const;
             Bool IsImmutableStorage() const;
             SizeT GetSize() const;
@@ -196,6 +213,8 @@ namespace MobileGL {
             Bool m_isImmutableStorage = false;
             GLbitfield m_storageFlags = 0;
             Uint64 m_changeSerial = 0;
+            // Set by MarkGpuWritten, cleared by SyncGpuWrites once the shadow is refreshed.
+            Bool m_gpuWritePending = false;
             Range1D m_mappedRange;
             Vector<Uint8> m_stagingData;
             Bool m_ownsStagingData;

MobileGL/MG_State/GLState/Core.cpp

@@ -424,6 +424,14 @@ namespace MobileGL::MG_State {
             m_renderState.SetPointSize(size);
         }
 
+        void GLContext::SetPatchVertices(Uint vertices) {
+            m_renderState.SetPatchVertices(vertices);
+        }
+
+        Uint GLContext::GetPatchVertices() const {
+            return m_renderState.GetPatchVertices();
+        }
+
         Float GLContext::GetPointSize() const {
             return m_renderState.GetPointSize();
         }
@@ -745,6 +753,95 @@ namespace MobileGL::MG_State {
         Bool GLContext::ValidateRenderbufferObject(Uint index) const {
             return m_renderbufferState.ValidateRenderbufferObject(index);
         }
+
+        void GLContext::SaveBoundTransformFeedbackState() {
+            auto& object = m_transformFeedbackObjects[m_boundTransformFeedback];
+            for (Uint i = 0; i < MAX_TRANSFORM_FEEDBACK_BUFFERS; ++i) {
+                const auto& point = m_bufferState.GetBindingPoint(BufferTarget::TransformFeedback, i);
+                object.bindings[i] = {point.GetBoundObject(), point.GetRange(), point.HasExplicitRange()};
+            }
+            object.active = m_transformFeedbackActive;
+            object.paused = m_transformFeedbackPaused;
+            object.primitiveMode = m_transformFeedbackPrimitiveMode;
+            object.program = m_transformFeedbackProgram;
+            object.generation = m_transformFeedbackGeneration;
+            object.capturedVertices = m_transformFeedbackCapturedVertices;
+            object.inputPrimitives = m_transformFeedbackInputPrimitives;
+        }
+
+        void GLContext::RestoreBoundTransformFeedbackState() {
+            const auto& object = m_transformFeedbackObjects[m_boundTransformFeedback];
+            for (Uint i = 0; i < MAX_TRANSFORM_FEEDBACK_BUFFERS; ++i) {
+                auto& point = m_bufferState.GetBindingPoint(BufferTarget::TransformFeedback, i);
+                point.Bind(object.bindings[i].buffer);
+                if (object.bindings[i].buffer) {
+                    point.SetRange(object.bindings[i].range, object.bindings[i].hasExplicitRange);
+                } else {
+                    point.ClearRange();
+                }
+            }
+            m_transformFeedbackActive = object.active;
+            m_transformFeedbackPaused = object.paused;
+            m_transformFeedbackPrimitiveMode = object.primitiveMode;
+            m_transformFeedbackProgram = object.program;
+            // The generation identifies one capture span, and a span belongs to the object
+            // that opened it - a backend keys its append state on it, so switching objects
+            // has to bring the right one back.
+            m_transformFeedbackGeneration = object.generation;
+            m_transformFeedbackCapturedVertices = object.capturedVertices;
+            m_transformFeedbackInputPrimitives = object.inputPrimitives;
+        }
+
+        void GLContext::GenTransformFeedbackNames(Uint number, Vector<Uint>& ids) {
+            ids.resize(number);
+            if (number == 0) return;
+            m_transformFeedbackNames.Generate(number, ids.data());
+            // A generated name already denotes an object with the default state, so that a
+            // bind never has to distinguish "first use" from any later one.
+            for (const Uint id : ids) {
+                m_transformFeedbackObjects[id] = {};
+            }
+        }
+
+        Bool GLContext::ValidateTransformFeedbackName(Uint index) const {
+            return index == 0 || m_transformFeedbackNames.IsValid(index);
+        }
+
+        void GLContext::BindTransformFeedbackObject(Uint index) {
+            if (index == m_boundTransformFeedback) return;
+            SaveBoundTransformFeedbackState();
+            m_boundTransformFeedback = index;
+            m_transformFeedbackObjects[index].everBound = true;
+            RestoreBoundTransformFeedbackState();
+        }
+
+        Bool GLContext::IsTransformFeedbackObject(Uint index) const {
+            if (index == 0 || !m_transformFeedbackNames.IsValid(index)) return false;
+            const auto it = m_transformFeedbackObjects.find(index);
+            return it != m_transformFeedbackObjects.end() && it->second.everBound;
+        }
+
+        void GLContext::MarkTransformFeedbackObjectForDeletion(Uint index) {
+            if (index == 0 || !m_transformFeedbackNames.IsValid(index)) return;
+            // Deleting the bound object reverts to the default one (GL 4.6 core 13.2.1);
+            // its state is dropped rather than saved back into the dying object.
+            if (index == m_boundTransformFeedback) {
+                m_boundTransformFeedback = 0;
+                RestoreBoundTransformFeedbackState();
+            }
+            m_transformFeedbackObjects.erase(index);
+            m_transformFeedbackNames.Delete(index);
+        }
+
+        Uint64 GLContext::GetTransformFeedbackRecordedVertices(Uint index) const {
+            const auto it = m_transformFeedbackObjects.find(index);
+            return it == m_transformFeedbackObjects.end() ? 0 : it->second.recordedVertices;
+        }
+
+        Bool GLContext::HasTransformFeedbackCompletedSpan(Uint index) const {
+            const auto it = m_transformFeedbackObjects.find(index);
+            return it != m_transformFeedbackObjects.end() && it->second.hasCompletedSpan;
+        }
     } // namespace GLState
 
     // Leak-at-exit storage; see GlobalObjects.cpp.

MobileGL/MG_State/GLState/Core.h

@@ -138,6 +138,8 @@ namespace MobileGL {
                 Float GetLineWidth() const;
                 void SetPointSize(Float size);
                 Float GetPointSize() const;
+                void SetPatchVertices(Uint vertices);
+                Uint GetPatchVertices() const;
                 void SetPolygonOffset(Float factor, Float units);
                 Float GetPolygonOffsetFactor() const;
                 Float GetPolygonOffsetUnits() const;
@@ -211,20 +213,30 @@ namespace MobileGL {
                 void SetScissorBox(IntVec4 box);      // x, y, width, height
                 const IntVec4& GetScissorBox() const; // x, y, width, height
 
-                // Transform feedback (GL 3.0 core Begin/End; no feedback objects yet)
+                // Transform feedback. The fields below are the state of the transform
+                // feedback object currently bound to GL_TRANSFORM_FEEDBACK; see the object
+                // block further down for how a bind swaps them.
                 void BeginTransformFeedback(GLenum primitiveMode, const SharedPtr<ProgramObject>& program) {
                     m_transformFeedbackActive = true;
+                    m_transformFeedbackPaused = false;
                     m_transformFeedbackPrimitiveMode = primitiveMode;
                     m_transformFeedbackProgram = program;
-                    ++m_transformFeedbackGeneration;
+                    m_transformFeedbackGeneration = ++m_transformFeedbackNextGeneration;
                     m_transformFeedbackCapturedVertices = 0;
                     m_transformFeedbackInputPrimitives = 0;
                 }
                 void EndTransformFeedback() {
                     m_transformFeedbackActive = false;
+                    m_transformFeedbackPaused = false;
                     m_transformFeedbackProgram.reset();
+                    // What glDrawTransformFeedback on this object replays from now on.
+                    auto& object = m_transformFeedbackObjects[m_boundTransformFeedback];
+                    object.recordedVertices = m_transformFeedbackCapturedVertices;
+                    object.hasCompletedSpan = true;
                 }
                 Bool IsTransformFeedbackActive() const { return m_transformFeedbackActive; }
+                Bool IsTransformFeedbackPaused() const { return m_transformFeedbackPaused; }
+                void SetTransformFeedbackPaused(Bool paused) { m_transformFeedbackPaused = paused; }
                 GLenum GetTransformFeedbackPrimitiveMode() const { return m_transformFeedbackPrimitiveMode; }
                 const SharedPtr<ProgramObject>& GetTransformFeedbackProgram() const {
                     return m_transformFeedbackProgram;
@@ -239,6 +251,15 @@ namespace MobileGL {
                     m_transformFeedbackPrimitiveCounter += primitives;
                 }
                 Uint64 GetTransformFeedbackPrimitiveCounter() const { return m_transformFeedbackPrimitiveCounter; }
+                // Primitives a draw assembled while the capture was paused. GL counts those in
+                // PRIMITIVES_GENERATED, but a backend that answers the query with its own
+                // transform feedback counter cannot see them - nothing was being captured.
+                void AddTransformFeedbackPausedPrimitives(Uint64 primitives) {
+                    m_transformFeedbackPausedPrimitiveCounter += primitives;
+                }
+                Uint64 GetTransformFeedbackPausedPrimitiveCounter() const {
+                    return m_transformFeedbackPausedPrimitiveCounter;
+                }
                 // Vertices already captured since BeginTransformFeedback (drives the
                 // buffer-capacity clamp on the primitives-written accounting).
                 void AddTransformFeedbackCapturedVertices(Uint64 vertices) {
@@ -252,6 +273,32 @@ namespace MobileGL {
                 }
                 Uint64 GetTransformFeedbackInputPrimitives() const { return m_transformFeedbackInputPrimitives; }
 
+                // Transform feedback objects (ARB_transform_feedback2 / GL 4.0 core).
+                // The capture state above and the indexed GL_TRANSFORM_FEEDBACK_BUFFER
+                // binding points are object state, but the context keeps exactly one live
+                // copy of both so that every existing reader - the backends' per-draw sync,
+                // the drawing and getter paths - needs no notion of which object owns them.
+                // A bind therefore saves the live copy into the outgoing object and restores
+                // the incoming one's. Object 0 is the default object and always exists.
+                static constexpr Uint MAX_TRANSFORM_FEEDBACK_BUFFERS = 4;
+                void GenTransformFeedbackNames(Uint number, Vector<Uint>& ids);
+                // A name glGenTransformFeedbacks handed out and glDeleteTransformFeedbacks
+                // has not taken back. Name 0 is always valid.
+                Bool ValidateTransformFeedbackName(Uint index) const;
+                // What glIsTransformFeedback reports: a generated name only becomes the name
+                // of an object once it has been bound at least once (GL 4.6 core 13.2.1).
+                Bool IsTransformFeedbackObject(Uint index) const;
+                void BindTransformFeedbackObject(Uint index);
+                void MarkTransformFeedbackObjectForDeletion(Uint index);
+                Uint GetBoundTransformFeedbackName() const { return m_boundTransformFeedback; }
+                // Vertices the object captured in its last completed span; the vertex count
+                // glDrawTransformFeedback replays.
+                Uint64 GetTransformFeedbackRecordedVertices(Uint index) const;
+                // Whether the object has ever completed a capture span. glDrawTransformFeedback
+                // on an object that has not is INVALID_OPERATION, which a zero vertex count
+                // cannot express: an empty completed span is legal and draws nothing.
+                Bool HasTransformFeedbackCompletedSpan(Uint index) const;
+
                 // Framebuffer
                 void GenFramebufferNames(Uint number, Vector<Uint>& framebuffers);
                 const SharedPtr<FramebufferObject>& GetFramebufferObject(Uint index);
@@ -285,12 +332,45 @@ namespace MobileGL {
                 VertexArrayState m_vertexArrayState;
                 Array<CurrentVertexAttributeValue, VertexArrayObject::MAX_VERTEX_ATTRIBS> m_currentVertexAttributes{};
                 Bool m_transformFeedbackActive = false;
+                Bool m_transformFeedbackPaused = false;
                 GLenum m_transformFeedbackPrimitiveMode = GL_POINTS;
                 SharedPtr<ProgramObject> m_transformFeedbackProgram;
                 Uint64 m_transformFeedbackGeneration = 0;
+                // Source of the per-span ids above; never rolls back with an object switch.
+                Uint64 m_transformFeedbackNextGeneration = 0;
+                // Not object state: the transform feedback queries snapshot it at BeginQuery
+                // and take the delta at EndQuery, which spans whatever objects were used.
                 Uint64 m_transformFeedbackPrimitiveCounter = 0;
+                Uint64 m_transformFeedbackPausedPrimitiveCounter = 0;
                 Uint64 m_transformFeedbackCapturedVertices = 0;
                 Uint64 m_transformFeedbackInputPrimitives = 0;
+
+                // Everything a transform feedback object owns while it is NOT the bound one.
+                struct TransformFeedbackObjectState {
+                    struct SavedBufferBinding {
+                        SharedPtr<BufferObject> buffer;
+                        Range1D range;
+                        Bool hasExplicitRange = false;
+                    };
+                    Array<SavedBufferBinding, MAX_TRANSFORM_FEEDBACK_BUFFERS> bindings;
+                    Bool active = false;
+                    Bool paused = false;
+                    GLenum primitiveMode = GL_POINTS;
+                    SharedPtr<ProgramObject> program;
+                    Uint64 generation = 0;
+                    Uint64 capturedVertices = 0;
+                    Uint64 inputPrimitives = 0;
+                    Uint64 recordedVertices = 0;
+                    Bool hasCompletedSpan = false;
+                    Bool everBound = false;
+                };
+                void SaveBoundTransformFeedbackState();
+                void RestoreBoundTransformFeedbackState();
+                // operator[] materialises an entry with the default state on first touch, so
+                // the default object (name 0) needs no seeding here.
+                UnorderedMap<Uint, TransformFeedbackObjectState> m_transformFeedbackObjects;
+                IndexGenerator<Uint> m_transformFeedbackNames;
+                Uint m_boundTransformFeedback = 0;
                 TextureState m_textureState;
                 ProgramState m_programState;
                 RenderState m_renderState;

MobileGL/MG_State/GLState/ProgramState/ProgramObject.cpp

@@ -174,6 +174,9 @@ namespace MobileGL::MG_State::GLState {
         m_xfbStrides.clear();
         m_xfbBufferMode = GL_INTERLEAVED_ATTRIBS;
         m_xfbVaryingNameMaxLength = 0;
+        m_xfbNeedsScatteredCapture = false;
+        m_xfbPackedStride = 0;
+        m_gsInputPrimitive = GL_NONE;
         m_linkStatus = false;
     }
 
@@ -222,6 +225,8 @@ namespace MobileGL::MG_State::GLState {
         m_xfbStrides.clear();
         m_xfbBufferMode = m_requestedXfbBufferMode;
         m_xfbVaryingNameMaxLength = 0;
+        m_xfbNeedsScatteredCapture = false;
+        m_xfbPackedStride = 0;
         if (m_requestedXfbVaryings.empty()) {
             return true;
         }
@@ -243,8 +248,27 @@ namespace MobileGL::MG_State::GLState {
 
         const Bool interleaved = m_xfbBufferMode == GL_INTERLEAVED_ATTRIBS;
         Uint32 interleavedOffset = 0;
+        // ARB_transform_feedback3 lets an interleaved capture leave holes (gl_SkipComponents1..4)
+        // and move on to the next buffer (gl_NextBuffer). Both only affect where the following
+        // varyings land, so they are consumed here and never become XfbVaryings of their own -
+        // which also keeps them out of the name list a backend declares on its own driver.
+        Uint32 interleavedBufferIndex = 0;
+        Vector<Uint32> interleavedStrides;
         for (SizeT i = 0; i < m_requestedXfbVaryings.size(); ++i) {
             const String& name = m_requestedXfbVaryings[i];
+            if (interleaved && name == "gl_NextBuffer") {
+                interleavedStrides.push_back(interleavedOffset);
+                interleavedOffset = 0;
+                ++interleavedBufferIndex;
+                m_xfbNeedsScatteredCapture = true;
+                continue;
+            }
+            if (interleaved && name.size() == 18 && name.compare(0, 17, "gl_SkipComponents") == 0 &&
+                name[17] >= '1' && name[17] <= '4') {
+                interleavedOffset += static_cast<Uint32>(name[17] - '0') * 4;
+                m_xfbNeedsScatteredCapture = true;
+                continue;
+            }
             for (SizeT j = 0; j < i; ++j) {
                 if (m_requestedXfbVaryings[j] == name) {
                     m_infoLog = "Transform feedback varying '" + name + "' is specified more than once.";
@@ -285,12 +309,14 @@ namespace MobileGL::MG_State::GLState {
             }
 
             varying.byteSize = bytesPerElement * static_cast<Uint32>(varying.size);
+            varying.packedOffsetBytes = m_xfbPackedStride;
+            m_xfbPackedStride += varying.byteSize;
             if (interleaved) {
-                varying.bufferIndex = 0;
+                varying.bufferIndex = interleavedBufferIndex;
                 varying.offsetBytes = interleavedOffset;
                 interleavedOffset += varying.byteSize;
             } else {
-                varying.bufferIndex = static_cast<Uint32>(i);
+                varying.bufferIndex = static_cast<Uint32>(m_xfbVaryings.size());
                 varying.offsetBytes = 0;
             }
             m_xfbVaryingNameMaxLength =
@@ -301,13 +327,22 @@ namespace MobileGL::MG_State::GLState {
         constexpr Uint32 kMaxSeparateAttribs = 4;
         constexpr Uint32 kMaxSeparateComponents = 4;
         constexpr Uint32 kMaxInterleavedComponents = 64;
+        constexpr Uint32 kMaxTransformFeedbackBuffers = 4;
         if (interleaved) {
-            if (interleavedOffset > kMaxInterleavedComponents * 4) {
-                m_infoLog = "Transform feedback interleaved capture exceeds "
-                            "GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS.";
+            interleavedStrides.push_back(interleavedOffset);
+            if (interleavedStrides.size() > kMaxTransformFeedbackBuffers) {
+                m_infoLog = "Transform feedback capture uses more buffers than "
+                            "GL_MAX_TRANSFORM_FEEDBACK_BUFFERS.";
                 return false;
             }
-            m_xfbStrides.assign(1, interleavedOffset);
+            for (const Uint32 stride : interleavedStrides) {
+                if (stride > kMaxInterleavedComponents * 4) {
+                    m_infoLog = "Transform feedback interleaved capture exceeds "
+                                "GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS.";
+                    return false;
+                }
+            }
+            m_xfbStrides = Move(interleavedStrides);
         } else {
             if (m_xfbVaryings.size() > kMaxSeparateAttribs) {
                 m_infoLog = "Transform feedback separate capture exceeds "
@@ -542,6 +577,20 @@ namespace MobileGL::MG_State::GLState {
             return;
         }
 
+        // GL_GEOMETRY_INPUT_TYPE. A draw's primitive type has to be compatible with it
+        // (GL 4.6 core 11.3.1), so it is resolved for every link, not only a capturing one.
+        m_gsInputPrimitive = GL_NONE;
+        if (const glslang::TIntermediate* gs = m_program->getIntermediate(EShLangGeometry)) {
+            switch (gs->getInputPrimitive()) {
+            case glslang::ElgPoints: m_gsInputPrimitive = GL_POINTS; break;
+            case glslang::ElgLines: m_gsInputPrimitive = GL_LINES; break;
+            case glslang::ElgLinesAdjacency: m_gsInputPrimitive = GL_LINES_ADJACENCY; break;
+            case glslang::ElgTriangles: m_gsInputPrimitive = GL_TRIANGLES; break;
+            case glslang::ElgTrianglesAdjacency: m_gsInputPrimitive = GL_TRIANGLES_ADJACENCY; break;
+            default: break;
+            }
+        }
+
         MGLOG_D("ProgramObject %u: Starting reflection", m_externalIndex);
         DoReflection();
         MGLOG_D("ProgramObject %u: Reflection done (linkStatus=%d)", m_externalIndex, (int)m_linkStatus);

MobileGL/MG_State/GLState/ProgramState/ProgramObject.h

@@ -377,6 +377,17 @@ namespace MobileGL::MG_State::GLState {
 
         Bool GetDeleteStatus() const { return m_deleteStatus; }
         Bool GetLinkStatus() const { return m_linkStatus; }
+        // GL_PROGRAM_BINARY_RETRIEVABLE_HINT. MobileGL exposes no program binary format
+        // (GL_NUM_PROGRAM_BINARY_FORMATS is 0), so the hint is pure state - which is all
+        // ARB_get_program_binary requires of it.
+        Bool GetBinaryRetrievableHint() const { return m_binaryRetrievableHint; }
+        void SetBinaryRetrievableHint(Bool hint) { m_binaryRetrievableHint = hint; }
+        // glProgramBinary always fails here (there is no format it could accept) and the
+        // spec then requires the program's LINK_STATUS to read FALSE.
+        void MarkLinkFailedByProgramBinary() {
+            ResetLinkArtifacts();
+            m_infoLog = "No program binary format is supported.";
+        }
         Bool GetValidateStatus() const { return m_validateStatus; }
         Int GetActiveAtomicCounterCount() const { return m_program->getNumAtomicCounters(); }
         Int GetActiveAttributesCount() const { return m_program->getNumPipeInputs(); }
@@ -474,6 +485,9 @@ namespace MobileGL::MG_State::GLState {
             Uint32 bufferIndex = 0;   // capture buffer slot
             Uint32 offsetBytes = 0;   // offset within the capture buffer
             Uint32 byteSize = 0;      // bytes captured per vertex for this varying
+            // Offset within the gap-free record a backend that cannot express the GL
+            // layout captures into; see NeedsScatteredTransformFeedbackCapture.
+            Uint32 packedOffsetBytes = 0;
         };
         void SetTransformFeedbackVaryings(Vector<String>&& names, GLenum bufferMode) {
             m_requestedXfbVaryings = Move(names);
@@ -491,12 +505,25 @@ namespace MobileGL::MG_State::GLState {
         }
         SizeT GetTransformFeedbackBufferCount() const { return m_xfbStrides.size(); }
         Int GetTransformFeedbackVaryingMaxLength() const { return m_xfbVaryingNameMaxLength; }
+        // True when the capture layout uses gl_SkipComponents / gl_NextBuffer
+        // (ARB_transform_feedback3), which no ES driver can express: it can only pack every
+        // captured varying into one record with no gaps. A backend that captures through
+        // such a driver has to capture into scratch storage and scatter the records into the
+        // application's buffers itself, using packedOffsetBytes as the source offset and
+        // (bufferIndex, offsetBytes, stride) as the destination.
+        Bool NeedsScatteredTransformFeedbackCapture() const { return m_xfbNeedsScatteredCapture; }
+        // Bytes one gap-free captured record occupies.
+        Uint32 GetTransformFeedbackPackedStride() const { return m_xfbPackedStride; }
         // True when the capture stage is a triangle-strip geometry shader with a
         // statically-known emit sequence: the Vulkan capture order then needs the GL
         // odd-triangle vertex swap after EndTransformFeedback.
         Bool HasGsTriangleStripCaptureFixup() const { return m_gsStripCaptureFixup; }
         // Triangles per strip, in emission order, for ONE geometry invocation.
         const Vector<Uint32>& GetGsStripTriangles() const { return m_gsStripTriangles; }
+        // GL_GEOMETRY_INPUT_TYPE of the linked geometry stage (GL_POINTS, GL_LINES,
+        // GL_LINES_ADJACENCY, GL_TRIANGLES or GL_TRIANGLES_ADJACENCY), or GL_NONE when the
+        // program has no geometry stage. Draws must present a compatible primitive type.
+        GLenum GetGeometryInputType() const { return m_gsInputPrimitive; }
 
         Uint GetExternalIndex() const { return m_externalIndex; }
         // Globally-unique, never-reused id for this program object's lifetime. Unlike the GL
@@ -577,6 +604,7 @@ namespace MobileGL::MG_State::GLState {
         String m_infoLog;
         Bool m_deleteStatus = false;
         Bool m_linkStatus = false;
+        Bool m_binaryRetrievableHint = false;
         Bool m_validateStatus = true;
         Uint32 m_backendStateVersion = 0;
 
@@ -604,7 +632,10 @@ namespace MobileGL::MG_State::GLState {
         Vector<Uint32> m_xfbStrides;
         Vector<Uint32> m_gsStripTriangles;
         Bool m_gsStripCaptureFixup = false;
+        GLenum m_gsInputPrimitive = GL_NONE;
         GLenum m_xfbBufferMode = GL_INTERLEAVED_ATTRIBS;
         Int m_xfbVaryingNameMaxLength = 0;
+        Bool m_xfbNeedsScatteredCapture = false;
+        Uint32 m_xfbPackedStride = 0;
     };
 } // namespace MobileGL::MG_State::GLState

MobileGL/MG_State/GLState/RenderState/RenderState.cpp

@@ -154,6 +154,17 @@ namespace MobileGL {
                 return m_parameters.PointSize;
             }
 
+            void RenderState::SetPatchVertices(Uint vertices) {
+                if (m_parameters.PatchVertices == vertices) return;
+
+                m_parameters.PatchVertices = vertices;
+                ++m_version;
+            }
+
+            Uint RenderState::GetPatchVertices() const {
+                return m_parameters.PatchVertices;
+            }
+
             void RenderState::SetPolygonOffset(Float factor, Float units) {
                 if (m_parameters.PolygonOffsetFactor == factor && m_parameters.PolygonOffsetUnits == units) return;
 

MobileGL/MG_State/GLState/RenderState/RenderState.h

@@ -224,6 +224,8 @@ namespace MobileGL {
         IntVec4 Viewport = IntVec4(0, 0, 0, 0); // x, y, width, height
         Float LineWidth = 1.0f;
         Float PointSize = 1.0f;
+        // GL_PATCH_VERTICES: how many vertices one tessellation patch consumes.
+        Uint PatchVertices = 3;
         Float PolygonOffsetFactor = 0.0f;
         Float PolygonOffsetUnits = 0.0f;
 
@@ -319,6 +321,8 @@ namespace MobileGL {
                 Float GetLineWidth() const;
                 void SetPointSize(Float size);
                 Float GetPointSize() const;
+                void SetPatchVertices(Uint vertices);
+                Uint GetPatchVertices() const;
                 void SetPolygonOffset(Float factor, Float units);
                 Float GetPolygonOffsetFactor() const;
                 Float GetPolygonOffsetUnits() const;

MobileGL/MG_State/GLState/TextureState/TextureObject.cpp

@@ -24,6 +24,19 @@ namespace MobileGL {
             TextureObjectBase::TextureObjectBase(TextureTarget target, Uint externalIndex)
                 : m_externalIndex(externalIndex), m_lifetimeId(AllocateLifetimeId()), m_target(target) {
                 m_sampler = MakeShared<SamplerObject>(0);
+                if (target == TextureTarget::TextureRectangle) {
+                    // A rectangle texture has no mip chain, so its initial sampler state is not
+                    // the shared one: TEXTURE_MIN_FILTER is LINEAR and TEXTURE_WRAP_S/T are
+                    // CLAMP_TO_EDGE (GL 4.6 core table 23.15). Leaving the 2D default of
+                    // NEAREST_MIPMAP_LINEAR in place makes the texture mipmap-incomplete from
+                    // birth, and every lookup that the application never re-filtered reads
+                    // (0, 0, 0, 1) instead of its contents.
+                    m_sampler->SetMinFilter(SamplerFilterMode::Linear);
+                    m_sampler->SetMipmapMode(SamplerMipmapMode::None);
+                    m_sampler->SetWrapS(SamplerWrapMode::ClampToEdge);
+                    m_sampler->SetWrapT(SamplerWrapMode::ClampToEdge);
+                    m_sampler->SetWrapR(SamplerWrapMode::ClampToEdge);
+                }
             }
 
             TextureInternalFormat TextureObjectBase::GetFormat() const {
@@ -335,6 +348,58 @@ namespace MobileGL {
 
             // TODO: add other texture types as needed
 
+        Bool IsMipmapCompleteForFilter(const ITextureObject* texture, Bool mipmapped) {
+            if (texture == nullptr) return true;
+            if (!texture->IsComplete()) return false;
+            if (!mipmapped) return true;
+
+            const auto* mipmapTexture = AsMipmapTexture(texture);
+            if (mipmapTexture == nullptr) return true; // no mip chain to be incomplete about
+
+            const UintVec2& levelRange = texture->GetLevelRange();
+            const Uint baseLevel = levelRange.x();
+            const Uint storedLevels = mipmapTexture->GetMipmapLevelCount();
+            if (baseLevel >= storedLevels) return false;
+
+            // An array texture's layer count is not a dimension of the image: it stays put all
+            // the way down the chain (GL 4.6 core 8.14.3). GetMipmapTexelSize reports it in the
+            // slot after the image's own dimensions.
+            const TextureTarget target = texture->GetTarget();
+            Int shrinkingComponents = 3;
+            if (target == TextureTarget::Texture1DArray) {
+                shrinkingComponents = 1;
+            } else if (target == TextureTarget::Texture2DArray || target == TextureTarget::TextureCubeMapArray) {
+                shrinkingComponents = 2;
+            }
+
+            for (const auto uploadTarget : texture->GetUploadTargets()) {
+                const IntVec3 baseSize = mipmapTexture->GetMipmapTexelSize(uploadTarget, baseLevel);
+                Int largest = 0;
+                for (Int component = 0; component < shrinkingComponents; ++component) {
+                    largest = std::max(largest, baseSize[component]);
+                }
+                if (largest <= 0) return false;
+
+                // p = log2 of the largest base dimension: the last level the chain needs
+                // before every dimension has reached 1. TEXTURE_MAX_LEVEL can cut it short.
+                Uint p = 0;
+                for (Int extent = largest; extent > 1; extent >>= 1) ++p;
+                const Uint lastLevel = std::min(baseLevel + p, levelRange.y());
+
+                for (Uint level = baseLevel; level <= lastLevel; ++level) {
+                    if (level >= storedLevels) return false;
+                    const IntVec3 actual = mipmapTexture->GetMipmapTexelSize(uploadTarget, level);
+                    for (Int component = 0; component < 3; ++component) {
+                        const Int expected = component < shrinkingComponents
+                            ? std::max(1, baseSize[component] >> (level - baseLevel))
+                            : baseSize[component];
+                        if (actual[component] != expected) return false;
+                    }
+                }
+            }
+            return true;
+        }
+
         } // namespace GLState
     } // namespace MG_State
 } // namespace MobileGL

MobileGL/MG_State/GLState/TextureState/TextureObject.h

@@ -156,6 +156,14 @@ namespace MobileGL::MG_State::GLState {
                    ? static_cast<TextureObjectMipmap*>(texture)
                    : nullptr;
     }
+    // Whether the texture satisfies the mipmap-completeness rules a minification filter
+    // that samples the mip chain imposes (GL 4.6 core 8.17): every level from the base to
+    // the effective max must exist at exactly half the previous one's size. `mipmapped` is
+    // the effective sampler's answer to "does this filter read more than the base level" -
+    // when it is false only base-level completeness matters, which the ordinary
+    // IsComplete() already covers. Sampling an incomplete texture returns (0, 0, 0, 1).
+    Bool IsMipmapCompleteForFilter(const ITextureObject* texture, Bool mipmapped);
+
     inline const TextureObjectMipmap* AsMipmapTexture(const ITextureObject* texture) {
         return (texture && texture->GetStorageType() == TextureStorageType::Mipmap)
                    ? static_cast<const TextureObjectMipmap*>(texture)

MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.cpp

@@ -916,6 +916,12 @@ namespace MobileGL::MG_Util::BackendLoader {
         GLfloat minFragmentInterpolationOffset = -0.5f;
         GLfloat maxFragmentInterpolationOffset = 0.4375f;
         GLint fragmentInterpolationOffsetBits = 4;
+        // Core minimums of both APIs (GL 4.6 table 23.53, ES 3.1 table 20.40); the probe
+        // below only ever widens them.
+        GLint minProgramTextureGatherOffset = -8;
+        GLint maxProgramTextureGatherOffset = 7;
+        GLint maxPatchVertices = 32;
+        GLint maxTessGenLevel = 64;
         glesFuncs.glGetFloatv(GL_ALIASED_LINE_WIDTH_RANGE, aliasedLineWidthRange);
         glesFuncs.glGetFloatv(GL_SMOOTH_LINE_WIDTH_RANGE, smoothLineWidthRange);
         glesFuncs.glGetFloatv(GL_SMOOTH_LINE_WIDTH_GRANULARITY, &smoothLineWidthGranularity);
@@ -944,6 +950,14 @@ namespace MobileGL::MG_Util::BackendLoader {
         // single test case. 1 is a spec-legal value (the minimum required), so cap
         // to what is actually implemented instead of forwarding the raw driver limit.
         maxSampleMaskWords = std::min(maxSampleMaskWords, 1);
+        glesFuncs.glGetIntegerv(GL_MAX_PATCH_VERTICES, &maxPatchVertices);
+        glesFuncs.glGetIntegerv(GL_MAX_TESS_GEN_LEVEL, &maxTessGenLevel);
+        glesFuncs.glGetIntegerv(GL_MIN_PROGRAM_TEXTURE_GATHER_OFFSET, &minProgramTextureGatherOffset);
+        glesFuncs.glGetIntegerv(GL_MAX_PROGRAM_TEXTURE_GATHER_OFFSET, &maxProgramTextureGatherOffset);
+        // A driver that leaves the probe untouched (pre-ES 3.1, or an ignored enum) must not
+        // drag the advertised range below what GL 4.0 requires of us.
+        minProgramTextureGatherOffset = std::min(minProgramTextureGatherOffset, -8);
+        maxProgramTextureGatherOffset = std::max(maxProgramTextureGatherOffset, 7);
         glesFuncs.glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &maxTextureImageUnits);
         glesFuncs.glGetIntegerv(GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &maxVertexTextureImageUnits);
         glesFuncs.glGetIntegerv(GL_MAX_COMPUTE_TEXTURE_IMAGE_UNITS, &maxComputeTextureImageUnits);
@@ -1027,6 +1041,10 @@ namespace MobileGL::MG_Util::BackendLoader {
         caps.MaxIntegerSamples = maxIntegerSamples;
         caps.MaxSamples = maxSamples;
         caps.MaxSampleMaskWords = maxSampleMaskWords;
+        caps.MaxPatchVertices = maxPatchVertices;
+        caps.MaxTessGenLevel = maxTessGenLevel;
+        caps.MinProgramTextureGatherOffset = minProgramTextureGatherOffset;
+        caps.MaxProgramTextureGatherOffset = maxProgramTextureGatherOffset;
         caps.MaxTextureImageUnits = maxTextureImageUnits;
         caps.MaxVertexTextureImageUnits = maxVertexTextureImageUnits;
         caps.MaxComputeTextureImageUnits = maxComputeTextureImageUnits;

MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.h

@@ -1102,6 +1102,10 @@ namespace MobileGL {
             Int MaxIntegerSamples = 1;
             Int MaxSamples = 1;
             Int MaxSampleMaskWords = 1;
+            Int MaxPatchVertices = 32;
+            Int MaxTessGenLevel = 64;
+            Int MinProgramTextureGatherOffset = -8;
+            Int MaxProgramTextureGatherOffset = 7;
             Int MaxTextureImageUnits = 32;
             Int MaxVertexTextureImageUnits = 32;
             Int MaxComputeTextureImageUnits = 32;

MobileGL/MG_Util/Converters/MGToGL/BufferEnumConverter.cpp

@@ -73,7 +73,7 @@ namespace MobileGL {
             }
         }
 
-        GLbitfield ConvertBufferMappingAccessToGLEnum(BufferMappingAccessBit access) {
+        GLbitfield ConvertBufferMappingAccessToGLEnum(Flags<BufferMappingAccessBit> access) {
             GLbitfield result = 0;
             if (access & BufferMappingAccessBit::Read) result |= GL_MAP_READ_BIT;
             if (access & BufferMappingAccessBit::Write) result |= GL_MAP_WRITE_BIT;

MobileGL/MG_Util/Converters/MGToGL/BufferEnumConverter.h

@@ -14,6 +14,6 @@ namespace MobileGL {
     namespace MG_Util {
         GLenum ConvertBufferTargetToGLEnum(BufferTarget bufferTarget);
         GLenum ConvertBufferUsageToGLEnum(BufferUsage usage);
-        GLbitfield ConvertBufferMappingAccessToGLEnum(BufferMappingAccessBit access);
+        GLbitfield ConvertBufferMappingAccessToGLEnum(Flags<BufferMappingAccessBit> access);
     } // namespace MG_Util
 } // namespace MobileGL

MobileGL/MG_Util/ShaderTranspiler/ShaderCompiler.cpp

@@ -397,11 +397,19 @@ namespace MobileGL {
                         }
                     } else {
                         switch (opcode) {
-                        // Everything that takes normalized coordinates. Tracing each one back to
-                        // its image type would let a module mix a normalized 2D lookup with a
-                        // rectangle fetch, but the extra reach is not worth the risk of getting
-                        // the trace wrong: decline the whole module instead.
-                        case spv::Op::OpImageSampleImplicitLod:
+                        // Normalized-coordinate lookups whose ESSL form the backend's
+                        // NormalizeRectSamplerCoordinates post-pass cannot repair: the
+                        // coordinate is either fused with something else in a single argument
+                        // (the Dref sample forms carry the compare value in coord.z) or the
+                        // divide would have to happen after a projective divide. Tracing each
+                        // one back to its image type would let a module mix a normalized 2D
+                        // lookup with a rectangle fetch, but the extra reach is not worth the
+                        // risk of getting the trace wrong: decline the whole module instead.
+                        //
+                        // OpImageSampleImplicitLod, OpImageGather and OpImageDrefGather are
+                        // absent because all three become an ESSL call whose argument 1 is the
+                        // bare texel-space coordinate, which the post-pass divides by the
+                        // texture size.
                         case spv::Op::OpImageSampleExplicitLod:
                         case spv::Op::OpImageSampleDrefImplicitLod:
                         case spv::Op::OpImageSampleDrefExplicitLod:
@@ -409,8 +417,6 @@ namespace MobileGL {
                         case spv::Op::OpImageSampleProjExplicitLod:
                         case spv::Op::OpImageSampleProjDrefImplicitLod:
                         case spv::Op::OpImageSampleProjDrefExplicitLod:
-                        case spv::Op::OpImageGather:
-                        case spv::Op::OpImageDrefGather:
                         case spv::Op::OpImageSparseSampleImplicitLod:
                         case spv::Op::OpImageSparseSampleExplicitLod:
                         case spv::Op::OpImageSparseSampleDrefImplicitLod: