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[Feat] (MG_Impl): transform feedback primitive queries

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glBeginQuery/glEndQuery now accept GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN
and GL_PRIMITIVES_GENERATED. The result comes from CPU-side accounting:
every captured draw adds the primitives it assembles, clamped by the
capture buffers' remaining capacity in whole primitives (a full buffer
stops recording, which is exactly what PRIMITIVES_WRITTEN reports), with
the captured-vertex cursor resetting on glBeginTransformFeedback.

Draws without a geometry stage write exactly what they assemble, so this
is precise for them (KHR-GL33.transform_feedback.query_vertex_* now pass);
geometry amplification is not modelled yet and the query_geometry_*
variants still fail.
This commit is contained in:
BZLZHH
2026-07-31 17:40:42 -04:00
parent c069890ac7
commit 641bc0cdd9
3 changed files with 133 additions and 15 deletions
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MobileGL/MG_State/GLState/Core.h
+16
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@@ -217,6 +217,7 @@ namespace MobileGL {
m_transformFeedbackPrimitiveMode = primitiveMode;
m_transformFeedbackProgram = program;
++m_transformFeedbackGeneration;
m_transformFeedbackCapturedVertices = 0;
}
void EndTransformFeedback() {
m_transformFeedbackActive = false;
@@ -230,6 +231,19 @@ namespace MobileGL {
// Bumped on every BeginTransformFeedback; the backend uses it to
// distinguish "resume appending" from "fresh capture".
Uint64 GetTransformFeedbackGeneration() const { return m_transformFeedbackGeneration; }
// CPU-side primitive accounting for the transform feedback queries:
// every captured draw adds its primitive count (draws without a
// geometry stage write exactly what they generate).
void AddTransformFeedbackPrimitives(Uint64 primitives) {
m_transformFeedbackPrimitiveCounter += primitives;
}
Uint64 GetTransformFeedbackPrimitiveCounter() const { return m_transformFeedbackPrimitiveCounter; }
// Vertices already captured since BeginTransformFeedback (drives the
// buffer-capacity clamp on the primitives-written accounting).
void AddTransformFeedbackCapturedVertices(Uint64 vertices) {
m_transformFeedbackCapturedVertices += vertices;
}
Uint64 GetTransformFeedbackCapturedVertices() const { return m_transformFeedbackCapturedVertices; }
// Framebuffer
void GenFramebufferNames(Uint number, Vector<Uint>& framebuffers);
@@ -267,6 +281,8 @@ namespace MobileGL {
GLenum m_transformFeedbackPrimitiveMode = GL_POINTS;
SharedPtr<ProgramObject> m_transformFeedbackProgram;
Uint64 m_transformFeedbackGeneration = 0;
Uint64 m_transformFeedbackPrimitiveCounter = 0;
Uint64 m_transformFeedbackCapturedVertices = 0;
TextureState m_textureState;
ProgramState m_programState;
RenderState m_renderState;