[Fix] (MG_Backend/DirectVulkan): support Voxy rendering

Implemented:

- Advertise Voxy-required DirectVulkan extensions without raising the reported OpenGL version.

- Add DirectVulkan compute, indirect draw count, DSA, readback, and buffer state paths needed by Voxy.

Fixed:

- Enable Vulkan shaderInt64 and drawIndirectFirstInstance so Voxy baseInstance-driven LOD draws address the correct section data.

- Fix DirectVulkan synchronization, framebuffer, texture readback, and shader interface handling used by Voxy and Minecraft screenshots.

Tests:

- Add MG_Test coverage for DirectVulkan extension advertising, DSA buffer/texture/framebuffer/vertex-array behavior, persistent mapped readback, and shader/program paths.

MobileGL/MG_State/GLState/BufferState/BufferObject.h

@@ -25,6 +25,7 @@ namespace MobileGL {
         AtomicCounter,
         DispatchIndirect,
         DrawIndirect,
+        Parameter,
         ShaderStorage,
         BufferTargetCount,
         Unknown = -1

MobileGL/MG_State/GLState/BufferState/BufferState.h

@@ -16,7 +16,7 @@ namespace MobileGL::MG_State::GLState {
         ToArray(BufferTarget::Vertex, BufferTarget::Uniform, BufferTarget::CopyRead, BufferTarget::CopyWrite,
                 BufferTarget::PixelPack, BufferTarget::PixelUnpack, BufferTarget::Query, BufferTarget::Texture,
                 BufferTarget::TransformFeedback, BufferTarget::AtomicCounter, BufferTarget::DispatchIndirect,
-                BufferTarget::DrawIndirect, BufferTarget::ShaderStorage);
+                BufferTarget::DrawIndirect, BufferTarget::Parameter, BufferTarget::ShaderStorage);
     constexpr const auto BufferBindPointTargets = ToArray(BufferTarget::Uniform, BufferTarget::TransformFeedback,
                                                           BufferTarget::AtomicCounter, BufferTarget::ShaderStorage);
 

MobileGL/MG_State/GLState/Core.cpp

@@ -413,6 +413,14 @@ namespace MobileGL::MG_State {
             return m_renderState.GetFrontFaceMode();
         }
 
+        void GLContext::SetProvokingVertexMode(ProvokingVertexMode mode) {
+            m_renderState.SetProvokingVertexMode(mode);
+        }
+
+        ProvokingVertexMode GLContext::GetProvokingVertexMode() const {
+            return m_renderState.GetProvokingVertexMode();
+        }
+
         void GLContext::SetScissorBox(IntVec4 box) {
             m_renderState.SetScissorBox(box);
         }

MobileGL/MG_State/GLState/Core.h

@@ -136,6 +136,8 @@ namespace MobileGL {
                 CullFaceMode GetCullFaceMode() const;
                 void SetFrontFaceMode(FrontFaceMode mode);
                 FrontFaceMode GetFrontFaceMode() const;
+                void SetProvokingVertexMode(ProvokingVertexMode mode);
+                ProvokingVertexMode GetProvokingVertexMode() const;
                 void SetScissorBox(IntVec4 box);      // x, y, width, height
                 const IntVec4& GetScissorBox() const; // x, y, width, height
 

MobileGL/MG_State/GLState/ProgramState/ProgramObject.cpp

@@ -299,6 +299,27 @@ namespace MobileGL::MG_State::GLState {
             }
         }
 
+        for (int i = 0; i < m_activeUniformCount; i++) {
+            auto& uniform = m_program->getUniform(i);
+            const auto locationIt = m_uniformLocations.find(uniform.name);
+            if (locationIt == m_uniformLocations.end()) {
+                continue;
+            }
+
+            const Uint location = locationIt->second;
+            if (location >= m_uniformSamplerOrImageUnitIndex.size() || uniform.getType() == nullptr ||
+                !uniform.getType()->isOpaque() || (!uniform.getType()->isTexture() && !uniform.getType()->isImage())) {
+                continue;
+            }
+
+            const int binding = uniform.getBinding();
+            if (binding >= 0 && binding != static_cast<int>(glslang::TQualifier::layoutBindingEnd)) {
+                m_uniformSamplerOrImageUnitIndex[location] = binding;
+                MGLOG_D("ProgramObject %u: Reflection - opaque uniform '%s' location=%u initialUnit=%d",
+                        m_externalIndex, uniform.name.c_str(), location, binding);
+            }
+        }
+
         // ------------ attributes (vertex in) ---------------
         Int inCount = m_program->getNumPipeInputs();
         MGLOG_D("ProgramObject %u: Reflection - pipe input count (attributes) = %d", m_externalIndex, inCount);

MobileGL/MG_State/GLState/RenderState/RenderState.cpp

@@ -360,6 +360,17 @@ namespace MobileGL {
                 return m_parameters.FrontFaceModeSetting;
             }
 
+            void RenderState::SetProvokingVertexMode(ProvokingVertexMode mode) {
+                if (m_parameters.ProvokingVertexModeSetting == mode) return;
+
+                m_parameters.ProvokingVertexModeSetting = mode;
+                ++m_version;
+            }
+
+            ProvokingVertexMode RenderState::GetProvokingVertexMode() const {
+                return m_parameters.ProvokingVertexModeSetting;
+            }
+
             // --------------------- Scissor ---------------------
             void RenderState::SetScissorBox(IntVec4 box) {
                 if (m_parameters.ScissorBox == box) return;

MobileGL/MG_State/GLState/RenderState/RenderState.h

@@ -94,6 +94,13 @@ namespace MobileGL {
         Unknown = -1
     };
 
+    enum class ProvokingVertexMode {
+        FirstVertex,
+        LastVertex,
+        ProvokingVertexModeCount,
+        Unknown = -1
+    };
+
     enum class CapabilityInput {
         Blend,
         ClipDistance0,
@@ -179,6 +186,7 @@ namespace MobileGL {
         Bool CullFaceEnabled = false;
         CullFaceMode CullFaceModeSetting = CullFaceMode::Back;
         FrontFaceMode FrontFaceModeSetting = FrontFaceMode::CounterClockwise;
+        ProvokingVertexMode ProvokingVertexModeSetting = ProvokingVertexMode::LastVertex;
 
         // Scissor
         Bool ScissorTestEnabled = false;
@@ -245,6 +253,8 @@ namespace MobileGL {
                 CullFaceMode GetCullFaceMode() const;
                 void SetFrontFaceMode(FrontFaceMode mode);
                 FrontFaceMode GetFrontFaceMode() const;
+                void SetProvokingVertexMode(ProvokingVertexMode mode);
+                ProvokingVertexMode GetProvokingVertexMode() const;
 
                 // Scissor
                 void SetScissorBox(IntVec4 box);      // x, y, width, height