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[Fix] (MG_State, MG_Impl): GL-order capture for geometry triangle strips

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Vulkan transform feedback captures odd strip triangles as (i, i+2, i+1)
while GL table 10.1 decomposes them as (i+1, i, i+2). When the capture
stage is a triangle-strip geometry shader whose EmitVertex/EndPrimitive
sequence is statically knowable (no emission under control flow), link
time extracts the per-invocation strip lengths from the glslang AST, and
EndTransformFeedback rotates each odd triangle's captured vertex records
into GL order in place (bounded by the binding ranges' whole-triangle
capacity; raw input primitives tracked per Begin/End).
KHR-GL33.transform_feedback.geometry passes - the family is 21/21.
This commit is contained in:
BZLZHH
2026-08-01 03:17:30 -04:00
parent 4407be89cd
commit dd745d7547
4 changed files with 148 additions and 0 deletions
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MobileGL/MG_State/GLState/Core.h
+8
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@@ -218,6 +218,7 @@ namespace MobileGL {
m_transformFeedbackProgram = program;
++m_transformFeedbackGeneration;
m_transformFeedbackCapturedVertices = 0;
m_transformFeedbackInputPrimitives = 0;
}
void EndTransformFeedback() {
m_transformFeedbackActive = false;
@@ -244,6 +245,12 @@ namespace MobileGL {
m_transformFeedbackCapturedVertices += vertices;
}
Uint64 GetTransformFeedbackCapturedVertices() const { return m_transformFeedbackCapturedVertices; }
// Raw assembled input primitives fed to the capture stage since Begin
// (pre-clamp; drives the GS strip capture-order fixup at EndTF).
void AddTransformFeedbackInputPrimitives(Uint64 primitives) {
m_transformFeedbackInputPrimitives += primitives;
}
Uint64 GetTransformFeedbackInputPrimitives() const { return m_transformFeedbackInputPrimitives; }
// Framebuffer
void GenFramebufferNames(Uint number, Vector<Uint>& framebuffers);
@@ -283,6 +290,7 @@ namespace MobileGL {
Uint64 m_transformFeedbackGeneration = 0;
Uint64 m_transformFeedbackPrimitiveCounter = 0;
Uint64 m_transformFeedbackCapturedVertices = 0;
Uint64 m_transformFeedbackInputPrimitives = 0;
TextureState m_textureState;
ProgramState m_programState;
RenderState m_renderState;