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[Fix] (Backend, Getter): retire the two frontend queries that were never asked and strip the unreachable frontend arms from the third

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- GLFunctionsTable had three entries that are frontend queries wearing a
  backend interface (plan B v2 §2.1(a)): GetIntegeri_v, GetInteger64i_v and
  GetProgramiv. Two of them have NO caller at all - `grep -o
  'gBackendFunctionsTable\.GL\.[A-Za-z_0-9]*'` outside MG_Backend/ lists 69
  distinct entries and neither GetInteger64i_v nor GetProgramiv is among them -
  so both table slots, both backends' implementations and both registrations are
  deleted here. This is plan B §11 P0's first "strictly no-op free win".
- Nothing was moved into MG_Impl, because MG_Impl already answers all of it.
  glGetInteger64i_v is served by GL_Getter.cpp:1240-1314, which handles the
  indexed buffer queries itself and derives every other pname from its own
  GetIntegeri_v ("Handing the leftovers straight to the backend instead made
  glGetInteger64i_v disagree with glGetIntegeri_v on the very same pname").
  glGetProgramiv is served by GL_Program.cpp, whose GL_COMPUTE_WORK_GROUP_SIZE
  arm (:928-946) reads ProgramObject::GetComputeLocalSize - a link artifact of
  the program the APPLICATION wrote, which is the only program in the
  application's namespace. §4.7.1 class B.
- GetIntegeri_v stays, but only for what a backend genuinely owns. Its pure
  frontend arms were unreachable: GL_Getter::GetIntegeri_v answers
  GL_SHADER_STORAGE_BUFFER_{BINDING,START,SIZE} through
  TryDecodeIndexedBufferQuery (:991-1029) and the six GL_IMAGE_BINDING_* pnames
  at :1115-1153, and returns before touching the table. That left 9 dead cases
  in DirectGLES.cpp and 9 in DirectVulkan.cpp - the plan's "15" undercounts the
  two files separately. What still arrives is GL_MAX_COMPUTE_WORK_GROUP_COUNT /
  _SIZE (GL_Getter.cpp:1161-1177, and MG_Util/ShaderTranspiler/CompileEnv.cpp
  :134-138 asks the table directly), so DirectVulkan keeps exactly those two and
  DirectGLES becomes a plain driver passthrough.
- The dead arms were also WRONG, which is why deleting rather than reconciling
  them is the strict no-op: they clamped a bound range's size to the buffer's
  current storage, while the frontend reports the size glBindBufferRange was
  asked for verbatim (GL 4.6 core tables 23.4/23.5 - the clamp answered 0 for
  KHR-GL43.shader_storage_buffer_object.basic-binding's shape). Had a later
  refactor made the table the answer, the regression would have been silent.
- ProgramResourceCache::computeWorkGroupSize and the spirv-reflect entry-point
  loop that filled it go with DirectVulkan's GetProgramiv; nothing else read it.
- Three cases added to AdvertisedLimitsScenario pin what the frontend answers,
  on both lanes: the indexed SSBO binding/start/size on the 32- and 64-bit
  widths INCLUDING a shrink of the store underneath the binding (the arm that
  actually separates verbatim from clamped), the six image-unit pnames on both
  widths, and the compute local size plus the INVALID_OPERATION a program with
  no compute stage must give.
- Both new gates were shown to go red for their reason: making
  GL_COMPUTE_WORK_GROUP_SIZE answer a defaulted (1,1,1) fails
  ComputeLocalSizeComesFromTheLinkedProgram on both lanes, and re-introducing
  the deleted store clamp in GL_Getter fails
  IndexedBufferBindingsAreReportedVerbatimOnBothWidths on both lanes.
- Tested: cmake --build build-linux -j 24 (clean); ctest -L unit -j 12 ->
  1382/1382 passed; ctest -R AdvertisedLimits -> 18/18 passed (6 pre-existing +
  3 new, x DirectGLES and DirectVulkan).
This commit is contained in:
swung0x48
2026-09-05 20:16:49 -04:00
parent d380a01f32
commit 50815a232e
8 changed files with 228 additions and 256 deletions
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MobileGL/MG_Backend/BackendObject.h
+16 -2
View File
@@ -192,9 +192,23 @@ namespace MobileGL {
void (*MemoryBarrierByRegion)(GLbitfield barriers);
void (*BindImageTexture)(GLuint unit, GLuint texture, GLint level, GLboolean layered, GLint layer,
GLenum access, GLenum format);
// The ONLY indexed query that is genuinely a backend one, and only for the pnames
// MG_Impl/GLImpl/Getter/GL_Getter.cpp does not already own. Every indexed pname that
// names FRONTEND state - the indexed buffer bindings, the per-unit texture/sampler
// bindings, the image-unit bindings, the viewport rectangles, the indexed capabilities
// - is answered in GL_Getter::GetIntegeri_v and never reaches this entry; the
// 64-bit and float/double widths are derived there from the same answer, which is why
// no GetInteger64i_v/GetFloati_v/GetDoublei_v table entry exists. In practice this
// leaves GL_MAX_COMPUTE_WORK_GROUP_COUNT / _SIZE (also asked directly by
// MG_Util/ShaderTranspiler/CompileEnv.cpp) plus whatever pname the frontend has no
// case for at all.
void (*GetIntegeri_v)(GLenum target, GLuint index, GLint* data);
void (*GetInteger64i_v)(GLenum target, GLuint index, GLint64* data);
void (*GetProgramiv)(GLuint program, GLenum pname, GLint* params);
// There is deliberately NO GetProgramiv entry: glGetProgramiv describes the program
// the APPLICATION wrote - link status, the transform-feedback mode, the compute local
// size - all of which are frontend link artifacts on ProgramObject, and
// MG_Impl/GLImpl/Program/GL_Program.cpp answers every one of them from there. Asking a
// backend would mean asking about a DIFFERENT program (a SPIRV-Cross-generated ESSL
// one, or a SPIR-V module), in a namespace the application never sees.
// The GL program interface (glGetProgramInterfaceiv / glGetProgramResource*) is NOT
// a backend query: it describes the program the application wrote, in the
// application's namespace, which neither backend program is in. It is answered
MobileGL/MG_Backend/DirectGLES/BackendObject_DirectGLES.cpp
-2
View File
@@ -1255,8 +1255,6 @@ namespace MobileGL::MG_Backend::DirectGLES {
funcsTable.GL.MemoryBarrierByRegion = MemoryBarrierByRegion;
funcsTable.GL.BindImageTexture = BindImageTexture;
funcsTable.GL.GetIntegeri_v = GetIntegeri_v;
funcsTable.GL.GetInteger64i_v = GetInteger64i_v;
funcsTable.GL.GetProgramiv = GetProgramiv;
funcsTable.GL.ShaderStorageBlockBinding = ShaderStorageBlockBinding;
funcsTable.GL.Clear = Clear;
funcsTable.GL.ClearBufferfi = ClearBufferfi;
MobileGL/MG_Backend/DirectGLES/DirectGLES.cpp
+13 -129
View File
@@ -7317,138 +7317,22 @@ namespace MobileGL::MG_Backend::DirectGLES {
TextureImpl::SyncImageTextureBinding(unit);
}
// Only the pnames MG_Impl/GLImpl/Getter/GL_Getter.cpp has no case for reach here. Every
// indexed pname naming FRONTEND state - the indexed buffer bindings, the per-unit
// texture/sampler bindings, the image-unit bindings, the viewport rectangles, the indexed
// capabilities - is answered there and returns before the table is consulted, so the arms
// this function used to carry for GL_SHADER_STORAGE_BUFFER_* and GL_IMAGE_BINDING_* were
// unreachable duplicates of the frontend's, and they did not even agree with it (the
// frontend reports the range glBindBufferRange was ASKED for, verbatim and unclamped; these
// clamped it to the buffer's current storage). In practice what arrives is
// GL_MAX_COMPUTE_WORK_GROUP_COUNT / _SIZE, which the driver owns.
void GetIntegeri_v(GLenum target, GLuint index, GLint* data) {
if (!data) return;
switch (target) {
case GL_SHADER_STORAGE_BUFFER_BINDING: {
auto& point = MG_State::pGLContext->GetBufferBindingPoint(BufferTarget::ShaderStorage, index);
auto& obj = point.GetBoundObject();
*data = obj ? static_cast<GLint>(obj->GetExternalIndex()) : 0;
return;
if (g_GLESFuncs.glGetIntegeri_v) {
g_GLESFuncs.glGetIntegeri_v(target, index, data);
} else {
*data = 0;
}
case GL_SHADER_STORAGE_BUFFER_START: {
auto& point = MG_State::pGLContext->GetBufferBindingPoint(BufferTarget::ShaderStorage, index);
*data = static_cast<GLint>(point.GetRange().start);
return;
}
case GL_SHADER_STORAGE_BUFFER_SIZE: {
auto& point = MG_State::pGLContext->GetBufferBindingPoint(BufferTarget::ShaderStorage, index);
auto& obj = point.GetBoundObject();
if (!obj) {
*data = 0;
return;
}
const auto& range = point.GetRange();
const auto start = std::min(range.start, obj->GetSize());
const auto end = std::min(range.end, obj->GetSize());
*data = static_cast<GLint>(end - start);
return;
}
case GL_IMAGE_BINDING_NAME: {
if (index >= MG_State::GLState::TextureState::MAX_TEXTURE_IMAGE_UNITS) {
*data = 0;
return;
}
auto& imageBinding = MG_State::pGLContext->GetImageTextureBinding(static_cast<Int>(index));
*data = imageBinding.Texture ? static_cast<GLint>(imageBinding.Texture->GetExternalIndex()) : 0;
return;
}
case GL_IMAGE_BINDING_LEVEL: {
if (index >= MG_State::GLState::TextureState::MAX_TEXTURE_IMAGE_UNITS) {
*data = 0;
return;
}
auto& imageBinding = MG_State::pGLContext->GetImageTextureBinding(static_cast<Int>(index));
*data = imageBinding.Level;
return;
}
case GL_IMAGE_BINDING_LAYERED: {
if (index >= MG_State::GLState::TextureState::MAX_TEXTURE_IMAGE_UNITS) {
*data = 0;
return;
}
auto& imageBinding = MG_State::pGLContext->GetImageTextureBinding(static_cast<Int>(index));
*data = imageBinding.Layered;
return;
}
case GL_IMAGE_BINDING_LAYER: {
if (index >= MG_State::GLState::TextureState::MAX_TEXTURE_IMAGE_UNITS) {
*data = 0;
return;
}
auto& imageBinding = MG_State::pGLContext->GetImageTextureBinding(static_cast<Int>(index));
*data = imageBinding.Layer;
return;
}
case GL_IMAGE_BINDING_ACCESS: {
if (index >= MG_State::GLState::TextureState::MAX_TEXTURE_IMAGE_UNITS) {
*data = 0;
return;
}
auto& imageBinding = MG_State::pGLContext->GetImageTextureBinding(static_cast<Int>(index));
*data = static_cast<GLint>(imageBinding.Access);
return;
}
case GL_IMAGE_BINDING_FORMAT: {
if (index >= MG_State::GLState::TextureState::MAX_TEXTURE_IMAGE_UNITS) {
*data = 0;
return;
}
auto& imageBinding = MG_State::pGLContext->GetImageTextureBinding(static_cast<Int>(index));
*data = static_cast<GLint>(imageBinding.Format);
return;
}
default:
if (g_GLESFuncs.glGetIntegeri_v) {
g_GLESFuncs.glGetIntegeri_v(target, index, data);
} else {
*data = 0;
}
return;
}
}
void GetInteger64i_v(GLenum target, GLuint index, GLint64* data) {
if (!data) return;
switch (target) {
case GL_SHADER_STORAGE_BUFFER_START: {
auto& point = MG_State::pGLContext->GetBufferBindingPoint(BufferTarget::ShaderStorage, index);
*data = static_cast<GLint64>(point.GetRange().start);
return;
}
case GL_SHADER_STORAGE_BUFFER_SIZE: {
auto& point = MG_State::pGLContext->GetBufferBindingPoint(BufferTarget::ShaderStorage, index);
auto& obj = point.GetBoundObject();
if (!obj) {
*data = 0;
return;
}
const auto& range = point.GetRange();
const auto start = std::min(range.start, obj->GetSize());
const auto end = std::min(range.end, obj->GetSize());
*data = static_cast<GLint64>(end - start);
return;
}
default:
if (g_GLESFuncs.glGetInteger64i_v) {
g_GLESFuncs.glGetInteger64i_v(target, index, data);
} else {
*data = 0;
}
return;
}
}
void GetProgramiv(GLuint program, GLenum pname, GLint* params) {
if (!params) return;
GLuint backendProgramId = GetBackendProgramId(program);
if (!backendProgramId) {
params[0] = 0;
return;
}
g_GLESFuncs.glGetProgramiv(backendProgramId, pname, params);
}
// NOTE the shape here, and do not "simplify" it back to GetBackendProgramId(): this entry
MobileGL/MG_Backend/DirectGLES/DirectGLES.h
-2
View File
@@ -92,8 +92,6 @@ namespace MobileGL::MG_Backend::DirectGLES {
void BindImageTexture(GLuint unit, GLuint texture, GLint level, GLboolean layered, GLint layer, GLenum access,
GLenum format);
void GetIntegeri_v(GLenum target, GLuint index, GLint* data);
void GetInteger64i_v(GLenum target, GLuint index, GLint64* data);
void GetProgramiv(GLuint program, GLenum pname, GLint* params);
void ShaderStorageBlockBinding(GLuint program, const GLchar* storageBlockName, GLuint storageBlockBinding);
Bool InitWindowSurface(NativeWindowType window);
Bool InitPbufferSurface(EGLint width, EGLint height);
MobileGL/MG_Backend/DirectVulkan/BackendObject_DirectVulkan.cpp
-2
View File
@@ -740,8 +740,6 @@ namespace MobileGL::MG_Backend::DirectVulkan {
funcsTable.GL.MemoryBarrierByRegion = MemoryBarrierByRegion;
funcsTable.GL.BindImageTexture = BindImageTexture;
funcsTable.GL.GetIntegeri_v = GetIntegeri_v;
funcsTable.GL.GetInteger64i_v = GetInteger64i_v;
funcsTable.GL.GetProgramiv = GetProgramiv;
funcsTable.GL.ShaderStorageBlockBinding = ShaderStorageBlockBinding;
funcsTable.GL.FenceSync = FenceSync;
funcsTable.GL.ClientWaitSync = ClientWaitSync;
MobileGL/MG_Backend/DirectVulkan/DirectVulkan.cpp
+13 -117
View File
@@ -78,7 +78,6 @@ namespace MobileGL::MG_Backend::DirectVulkan {
Uint32 blockBindingVersion = 0;
Vector<StorageBlockResource> storageBlocks;
Vector<BufferVariableResource> bufferVariables;
GLint computeWorkGroupSize[3] = {1, 1, 1};
};
struct DrawElementsIndirectCommand {
@@ -209,16 +208,6 @@ namespace MobileGL::MG_Backend::DirectVulkan {
}
for (auto& module : modules) {
for (Uint32 entryIndex = 0; entryIndex < module.entry_point_count; ++entryIndex) {
const auto& entryPoint = module.entry_points[entryIndex];
if ((entryPoint.shader_stage & SPV_REFLECT_SHADER_STAGE_COMPUTE_BIT) == 0) {
continue;
}
cache.computeWorkGroupSize[0] = static_cast<GLint>(std::max<Uint32>(entryPoint.local_size.x, 1));
cache.computeWorkGroupSize[1] = static_cast<GLint>(std::max<Uint32>(entryPoint.local_size.y, 1));
cache.computeWorkGroupSize[2] = static_cast<GLint>(std::max<Uint32>(entryPoint.local_size.z, 1));
}
uint32_t bindingCount = 0;
SpvReflectResult result = spvReflectEnumerateDescriptorBindings(&module, &bindingCount, nullptr);
if (result != SPV_REFLECT_RESULT_SUCCESS || bindingCount == 0) {
@@ -683,130 +672,37 @@ namespace MobileGL::MG_Backend::DirectVulkan {
(void)format;
}
// The two compute limits are the only indexed pnames a backend genuinely owns: they come
// from the physical device, and MG_Impl/GLImpl/Getter/GL_Getter.cpp asks for them here so it
// can raise the answer to the GL required minimum. Every other indexed pname names FRONTEND
// state (the indexed buffer bindings, the per-unit texture/sampler bindings, the image-unit
// bindings, the viewport rectangles, the indexed capabilities) and is answered there before
// the table is consulted, so the arms this function used to carry for
// GL_SHADER_STORAGE_BUFFER_* and GL_IMAGE_BINDING_* were unreachable duplicates - and not
// even faithful ones: the frontend reports the range glBindBufferRange was ASKED for,
// verbatim, while these clamped it to the buffer's current storage.
void GetIntegeri_v(GLenum target, GLuint index, GLint* data) {
if (!data) return;
MOBILEGL_ASSERT(pVulkanRenderer, "DirectVulkan::GetIntegeri_v called with null VulkanRenderer");
if (index >= 3) {
*data = 0;
return;
}
switch (target) {
case GL_MAX_COMPUTE_WORK_GROUP_COUNT:
if (index >= 3) {
*data = 0;
return;
}
*data = static_cast<GLint>(
pVulkanRenderer->GetPhysicalDevice().properties.limits.maxComputeWorkGroupCount[index]);
return;
case GL_MAX_COMPUTE_WORK_GROUP_SIZE:
if (index >= 3) {
*data = 0;
return;
}
*data = static_cast<GLint>(
pVulkanRenderer->GetPhysicalDevice().properties.limits.maxComputeWorkGroupSize[index]);
return;
case GL_SHADER_STORAGE_BUFFER_BINDING: {
auto& point = MG_State::pGLContext->GetBufferBindingPoint(BufferTarget::ShaderStorage, index);
auto& obj = point.GetBoundObject();
*data = obj ? static_cast<GLint>(obj->GetExternalIndex()) : 0;
return;
}
case GL_SHADER_STORAGE_BUFFER_START: {
auto& point = MG_State::pGLContext->GetBufferBindingPoint(BufferTarget::ShaderStorage, index);
*data = static_cast<GLint>(point.GetRange().start);
return;
}
case GL_SHADER_STORAGE_BUFFER_SIZE: {
auto& point = MG_State::pGLContext->GetBufferBindingPoint(BufferTarget::ShaderStorage, index);
auto& obj = point.GetBoundObject();
if (!obj) {
*data = 0;
return;
}
const auto& range = point.GetRange();
const auto start = std::min(range.start, obj->GetSize());
const auto end = std::min(range.end, obj->GetSize());
*data = static_cast<GLint>(end - start);
return;
}
case GL_IMAGE_BINDING_NAME:
case GL_IMAGE_BINDING_LEVEL:
case GL_IMAGE_BINDING_LAYERED:
case GL_IMAGE_BINDING_LAYER:
case GL_IMAGE_BINDING_ACCESS:
case GL_IMAGE_BINDING_FORMAT: {
if (index >= MG_State::GLState::TextureState::MAX_TEXTURE_IMAGE_UNITS) {
*data = 0;
return;
}
auto& imageBinding = MG_State::pGLContext->GetImageTextureBinding(static_cast<Int>(index));
if (target == GL_IMAGE_BINDING_NAME) {
*data = imageBinding.Texture ? static_cast<GLint>(imageBinding.Texture->GetExternalIndex()) : 0;
} else if (target == GL_IMAGE_BINDING_LEVEL) {
*data = imageBinding.Level;
} else if (target == GL_IMAGE_BINDING_LAYERED) {
*data = imageBinding.Layered;
} else if (target == GL_IMAGE_BINDING_LAYER) {
*data = imageBinding.Layer;
} else if (target == GL_IMAGE_BINDING_ACCESS) {
*data = static_cast<GLint>(imageBinding.Access);
} else {
*data = static_cast<GLint>(imageBinding.Format);
}
return;
}
default:
*data = 0;
return;
}
}
void GetInteger64i_v(GLenum target, GLuint index, GLint64* data) {
if (!data) return;
switch (target) {
case GL_SHADER_STORAGE_BUFFER_START: {
auto& point = MG_State::pGLContext->GetBufferBindingPoint(BufferTarget::ShaderStorage, index);
*data = static_cast<GLint64>(point.GetRange().start);
return;
}
case GL_SHADER_STORAGE_BUFFER_SIZE: {
auto& point = MG_State::pGLContext->GetBufferBindingPoint(BufferTarget::ShaderStorage, index);
auto& obj = point.GetBoundObject();
if (!obj) {
*data = 0;
return;
}
const auto& range = point.GetRange();
const auto start = std::min(range.start, obj->GetSize());
const auto end = std::min(range.end, obj->GetSize());
*data = static_cast<GLint64>(end - start);
return;
}
default:
*data = 0;
return;
}
}
void GetProgramiv(GLuint program, GLenum pname, GLint* params) {
if (!params) return;
auto* programObject = TryGetDirectVulkanProgram(program);
if (!programObject) {
params[0] = 0;
return;
}
switch (pname) {
case GL_COMPUTE_WORK_GROUP_SIZE: {
auto& cache = GetProgramResourceCache(*programObject);
params[0] = cache.computeWorkGroupSize[0];
params[1] = cache.computeWorkGroupSize[1];
params[2] = cache.computeWorkGroupSize[2];
return;
}
default:
params[0] = 0;
return;
}
}
void ShaderStorageBlockBinding(GLuint program, const GLchar* storageBlockName, GLuint storageBlockBinding) {
auto* programObject = TryGetDirectVulkanProgram(program);
if (!programObject || storageBlockName == nullptr) return;
MobileGL/MG_Backend/DirectVulkan/DirectVulkan.h
-2
View File
@@ -95,8 +95,6 @@ namespace MobileGL::MG_Backend::DirectVulkan {
void BindImageTexture(GLuint unit, GLuint texture, GLint level, GLboolean layered, GLint layer, GLenum access,
GLenum format);
void GetIntegeri_v(GLenum target, GLuint index, GLint* data);
void GetInteger64i_v(GLenum target, GLuint index, GLint64* data);
void GetProgramiv(GLuint program, GLenum pname, GLint* params);
void ShaderStorageBlockBinding(GLuint program, const GLchar* storageBlockName, GLuint storageBlockBinding);
void ReadPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, void* pixels);
void GetTexImage(GLenum target, GLint level, GLenum format, GLenum type, GLvoid* pixels);
MobileGL/MG_IntegrationTest/Scenarios/AdvertisedLimitsScenario.cpp
+186
View File
@@ -378,5 +378,191 @@ namespace MGITest {
EXPECT_GE(viewportDims[1], maxRenderbufferSize);
}
// THE INDEXED AND PER-PROGRAM QUERIES THAT NAME FRONTEND STATE, pinned on both lanes.
//
// Both backends used to carry their own arms for GL_SHADER_STORAGE_BUFFER_* and
// GL_IMAGE_BINDING_* inside GLFunctionsTable::GetIntegeri_v, and their own
// GetInteger64i_v / GetProgramiv table entries. None of it was reachable: GL_Getter and
// GL_Program answer every one of these pnames from the frontend's own state and return
// before the table is consulted. The duplicates did not even agree - the backend arms
// clamped a bound range to the buffer's current storage, which GL 4.6 core tables
// 23.4/23.5 do not permit - so the code was one refactor away from becoming the answer.
// These cases pin what the frontend actually reports, so a future move of any of it back
// behind the interface has to keep saying the same thing.
TEST_F(AdvertisedLimitsScenario, IndexedBufferBindingsAreReportedVerbatimOnBothWidths) {
GLuint buffer = 0;
glGenBuffers(1, &buffer);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, buffer);
glBufferData(GL_SHADER_STORAGE_BUFFER, 1024, nullptr, GL_DYNAMIC_DRAW);
ASSERT_EQ(FirstGLError(), GLenum(GL_NO_ERROR));
// A range that is NOT the whole buffer, so a clamp to the store would be visible.
glBindBufferRange(GL_SHADER_STORAGE_BUFFER, 1, buffer, 256, 512);
ASSERT_EQ(FirstGLError(), GLenum(GL_NO_ERROR));
GLint binding32 = -1;
GLint start32 = -1;
GLint size32 = -1;
glGetIntegeri_v(GL_SHADER_STORAGE_BUFFER_BINDING, 1, &binding32);
glGetIntegeri_v(GL_SHADER_STORAGE_BUFFER_START, 1, &start32);
glGetIntegeri_v(GL_SHADER_STORAGE_BUFFER_SIZE, 1, &size32);
EXPECT_EQ(FirstGLError(), GLenum(GL_NO_ERROR));
EXPECT_EQ(binding32, static_cast<GLint>(buffer));
EXPECT_EQ(start32, 256);
EXPECT_EQ(size32, 512);
// The 64-bit width has to agree pname for pname. It has no backend entry of its own
// and derives everything from the 32-bit answer above plus its own buffer arm.
GLint64 binding64 = -1;
GLint64 start64 = -1;
GLint64 size64 = -1;
glGetInteger64i_v(GL_SHADER_STORAGE_BUFFER_BINDING, 1, &binding64);
glGetInteger64i_v(GL_SHADER_STORAGE_BUFFER_START, 1, &start64);
glGetInteger64i_v(GL_SHADER_STORAGE_BUFFER_SIZE, 1, &size64);
EXPECT_EQ(FirstGLError(), GLenum(GL_NO_ERROR));
EXPECT_EQ(binding64, static_cast<GLint64>(buffer));
EXPECT_EQ(start64, static_cast<GLint64>(256));
EXPECT_EQ(size64, static_cast<GLint64>(512));
// An unbound index answers zero rather than erroring or leaking the driver's answer.
GLint unbound = -1;
glGetIntegeri_v(GL_SHADER_STORAGE_BUFFER_BINDING, 0, &unbound);
EXPECT_EQ(FirstGLError(), GLenum(GL_NO_ERROR));
EXPECT_EQ(unbound, 0);
// THE ARM THAT SEPARATES VERBATIM FROM CLAMPED. GL 4.6 core tables 23.4/23.5 report
// the size glBindBufferRange was ASKED for; it does not follow the buffer, so
// shrinking the store underneath the binding must not move it. A clamp to the
// current storage - which is exactly what both backends' deleted arms did - answers
// 128 here, and answers 0 for the bind-then-allocate shape
// KHR-GL43.shader_storage_buffer_object.basic-binding uses.
glBufferData(GL_SHADER_STORAGE_BUFFER, 128, nullptr, GL_DYNAMIC_DRAW);
ASSERT_EQ(FirstGLError(), GLenum(GL_NO_ERROR));
GLint startAfterShrink = -1;
GLint sizeAfterShrink = -1;
GLint64 sizeAfterShrink64 = -1;
glGetIntegeri_v(GL_SHADER_STORAGE_BUFFER_START, 1, &startAfterShrink);
glGetIntegeri_v(GL_SHADER_STORAGE_BUFFER_SIZE, 1, &sizeAfterShrink);
glGetInteger64i_v(GL_SHADER_STORAGE_BUFFER_SIZE, 1, &sizeAfterShrink64);
EXPECT_EQ(FirstGLError(), GLenum(GL_NO_ERROR));
EXPECT_EQ(startAfterShrink, 256)
<< "the bound range's start followed the buffer through a re-specification";
EXPECT_EQ(sizeAfterShrink, 512)
<< "the bound range's size was clamped to the buffer's current 128-byte storage; the range is "
"state of the BINDING POINT and is reported verbatim";
EXPECT_EQ(sizeAfterShrink64, static_cast<GLint64>(512))
<< "the 64-bit width disagreed with the 32-bit one about the same pname";
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, 0);
glDeleteBuffers(1, &buffer);
(void)FirstGLError();
}
TEST_F(AdvertisedLimitsScenario, ImageUnitBindingsAreReportedFromTheFrontendState) {
GLint maxImageUnits = 0;
glGetIntegerv(GL_MAX_IMAGE_UNITS, &maxImageUnits);
(void)FirstGLError();
if (maxImageUnits < 2) GTEST_SKIP() << "no image units to bind on this lane";
GLuint texture = 0;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexStorage2D(GL_TEXTURE_2D, 2, GL_RGBA8, 8, 8);
ASSERT_EQ(FirstGLError(), GLenum(GL_NO_ERROR));
glBindImageTexture(1, texture, 1, GL_FALSE, 0, GL_READ_ONLY, GL_RGBA8);
ASSERT_EQ(FirstGLError(), GLenum(GL_NO_ERROR));
struct Expectation {
GLenum pname;
const char* name;
GLint expected;
};
const Expectation expectations[] = {
{GL_IMAGE_BINDING_NAME, "GL_IMAGE_BINDING_NAME", static_cast<GLint>(texture)},
{GL_IMAGE_BINDING_LEVEL, "GL_IMAGE_BINDING_LEVEL", 1},
{GL_IMAGE_BINDING_LAYERED, "GL_IMAGE_BINDING_LAYERED", GL_FALSE},
{GL_IMAGE_BINDING_LAYER, "GL_IMAGE_BINDING_LAYER", 0},
{GL_IMAGE_BINDING_ACCESS, "GL_IMAGE_BINDING_ACCESS", GL_READ_ONLY},
{GL_IMAGE_BINDING_FORMAT, "GL_IMAGE_BINDING_FORMAT", GL_RGBA8},
};
for (const Expectation& expectation : expectations) {
GLint value = -424242;
glGetIntegeri_v(expectation.pname, 1, &value);
EXPECT_EQ(FirstGLError(), GLenum(GL_NO_ERROR)) << expectation.name;
EXPECT_EQ(value, expectation.expected) << expectation.name;
// Same pname through the wide width - it must not fall through to a driver that
// knows nothing about MobileGL's image-unit state.
GLint64 wide = -424242;
glGetInteger64i_v(expectation.pname, 1, &wide);
EXPECT_EQ(FirstGLError(), GLenum(GL_NO_ERROR)) << expectation.name << " (64-bit)";
EXPECT_EQ(wide, static_cast<GLint64>(expectation.expected)) << expectation.name << " (64-bit)";
}
glBindImageTexture(1, 0, 0, GL_FALSE, 0, GL_READ_ONLY, GL_RGBA8);
glDeleteTextures(1, &texture);
(void)FirstGLError();
}
// glGetProgramiv(GL_COMPUTE_WORK_GROUP_SIZE) is a LINK ARTIFACT of the program the
// application wrote. DirectVulkan used to answer it from its own spirv-reflect cache and
// DirectGLES by forwarding to the driver's ESSL program - neither of which the
// application ever named - while GL_Program.cpp has always answered it from
// ProgramObject::GetComputeLocalSize. This pins the declared local size on both lanes.
TEST_F(AdvertisedLimitsScenario, ComputeLocalSizeComesFromTheLinkedProgram) {
static const char* kSource = R"(#version 430 core
layout(local_size_x = 4, local_size_y = 3, local_size_z = 2) in;
layout(std430, binding = 0) buffer Output { uint g_data[]; };
void main() { g_data[gl_LocalInvocationIndex] = 1u; }
)";
const GLuint shader = glCreateShader(GL_COMPUTE_SHADER);
glShaderSource(shader, 1, &kSource, nullptr);
glCompileShader(shader);
GLint compiled = 0;
glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
if (compiled == GL_FALSE) {
char log[2048] = {};
glGetShaderInfoLog(shader, sizeof(log) - 1, nullptr, log);
glDeleteShader(shader);
(void)FirstGLError();
GTEST_SKIP() << "no compute shader support on this lane: " << log;
}
const GLuint program = glCreateProgram();
glAttachShader(program, shader);
glLinkProgram(program);
glDeleteShader(shader);
GLint linked = 0;
glGetProgramiv(program, GL_LINK_STATUS, &linked);
if (linked == GL_FALSE) {
char log[2048] = {};
glGetProgramInfoLog(program, sizeof(log) - 1, nullptr, log);
glDeleteProgram(program);
(void)FirstGLError();
GTEST_SKIP() << "the compute program did not link on this lane: " << log;
}
GLint localSize[3] = {-1, -1, -1};
glGetProgramiv(program, GL_COMPUTE_WORK_GROUP_SIZE, localSize);
EXPECT_EQ(FirstGLError(), GLenum(GL_NO_ERROR));
EXPECT_EQ(localSize[0], 4);
EXPECT_EQ(localSize[1], 3);
EXPECT_EQ(localSize[2], 2);
// A program with no compute stage must answer INVALID_OPERATION, not a stale or
// defaulted (1, 1, 1) - the frontend's rule, and the one a backend that answers from
// its own reflection cache cannot express.
const GLuint empty = glCreateProgram();
GLint ignored[3] = {0, 0, 0};
glGetProgramiv(empty, GL_COMPUTE_WORK_GROUP_SIZE, ignored);
EXPECT_EQ(FirstGLError(), GLenum(GL_INVALID_OPERATION))
<< "GL 4.6 core 7.13: the query is only defined for a linked program with a compute shader";
glDeleteProgram(empty);
glDeleteProgram(program);
(void)FirstGLError();
}
} // namespace
} // namespace MGITest