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[Feat] (DirectVulkan, MG_Impl): GPU transform feedback primitive queries

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The TF primitive queries now ride VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT
pools when the device reports transformFeedbackQueries: each captured draw
is wrapped in a slot (shared between both GL targets when active
together), and results sum the (written, needed) pairs -
GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN from the first,
GL_PRIMITIVES_GENERATED from the second. This is exact through geometry
shaders, so KHR-GL33.transform_feedback.query_geometry_* pass; the CPU
accounting delta remains the fallback for backends without the feature.
This commit is contained in:
BZLZHH
2026-08-01 02:02:35 -04:00
parent f748a06632
commit b9a15aed61
7 changed files with 187 additions and 7 deletions
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MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.h
+24
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@@ -503,6 +503,30 @@ namespace MobileGL::MG_Backend::DirectVulkan {
Uint32 m_occlusionSlotCursor = 0;
Bool m_occlusionCaptureActive = false;
Vector<Uint32> m_occlusionActiveSlots;
// Transform feedback primitive queries: one pool slot per captured draw yields
// the (written, needed) pair; GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN sums the
// first, GL_PRIMITIVES_GENERATED the second - exact with geometry shaders,
// unlike the CPU fallback accounting.
Bool m_xfbQueriesSupported = false;
PFN_vkCmdBeginQueryIndexedEXT s_vkCmdBeginQueryIndexedEXT = nullptr;
PFN_vkCmdEndQueryIndexedEXT s_vkCmdEndQueryIndexedEXT = nullptr;
VkQueryPool m_xfbQueryPool = VK_NULL_HANDLE;
static constexpr Uint32 kXfbQuerySlots = 8192;
Uint32 m_xfbQuerySlotCursor = 0;
Bool m_xfbQueryCaptureActive[2] = {false, false}; // [0]=written, [1]=generated
Vector<Uint32> m_xfbQueryActiveSlots[2];
Bool m_xfbQuerySlotOpen = false;
Uint32 m_xfbQueryOpenSlot = 0;
public:
// kind: 0 = PRIMITIVES_WRITTEN, 1 = PRIMITIVES_GENERATED.
Bool StartXfbQueryCapture(Uint32 kind);
void StopXfbQueryCapture(Uint32 kind, Vector<Uint32>& outSlots);
Bool ResolveXfbQueryResult(const Vector<Uint32>& slots, Bool wantGenerated, Uint64& outPrimitives);
private:
void BeginXfbQueryForDraw(VkCommandBuffer commandBuffer);
void EndXfbQueryForDraw(VkCommandBuffer commandBuffer);
VkCommandPool m_commandPool = VK_NULL_HANDLE;