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[Feat] (MG_State, MG_Impl): transform feedback state, validation and reflection

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First stage of GL 3.0 transform feedback: glTransformFeedbackVaryings /
glGetTransformFeedbackVarying / glBeginTransformFeedback /
glEndTransformFeedback were unimplemented stubs. This adds

- per-program capture state: requested varyings apply on the next link and
  resolve against the last vertex-processing stage's linker objects (with
  gl_Position/gl_PointSize handled as builtins), failing the link on
  unknown or duplicate names or exceeded interleaved/separate limits, with
  offsets and strides computed per GL rules;
- context Begin/End state with the GL 3.3 error semantics: invalid
  primitive modes, redundant Begin/End, missing program or capture-buffer
  bindings, primitive-mode compatibility at draw time, and the
  while-active prohibitions on rebinding capture buffers, switching
  programs, and relinking the captured program;
- GetProgramiv TRANSFORM_FEEDBACK_* queries and a 4-slot bound on indexed
  GL_TRANSFORM_FEEDBACK_BUFFER binding points.

KHR-GL33.transform_feedback api_errors/linking_errors/get_xfb_varying now
pass; GPU-side capture is the remaining stage.
This commit is contained in:
BZLZHH
2026-07-31 17:08:37 -04:00
parent a389477f78
commit 48dd1c5956
10 changed files with 422 additions and 7 deletions
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MobileGL/MG_State/GLState/Core.h
+19
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@@ -211,6 +211,22 @@ namespace MobileGL {
void SetScissorBox(IntVec4 box); // x, y, width, height
const IntVec4& GetScissorBox() const; // x, y, width, height
// Transform feedback (GL 3.0 core Begin/End; no feedback objects yet)
void BeginTransformFeedback(GLenum primitiveMode, const SharedPtr<ProgramObject>& program) {
m_transformFeedbackActive = true;
m_transformFeedbackPrimitiveMode = primitiveMode;
m_transformFeedbackProgram = program;
}
void EndTransformFeedback() {
m_transformFeedbackActive = false;
m_transformFeedbackProgram.reset();
}
Bool IsTransformFeedbackActive() const { return m_transformFeedbackActive; }
GLenum GetTransformFeedbackPrimitiveMode() const { return m_transformFeedbackPrimitiveMode; }
const SharedPtr<ProgramObject>& GetTransformFeedbackProgram() const {
return m_transformFeedbackProgram;
}
// Framebuffer
void GenFramebufferNames(Uint number, Vector<Uint>& framebuffers);
const SharedPtr<FramebufferObject>& GetFramebufferObject(Uint index);
@@ -243,6 +259,9 @@ namespace MobileGL {
BufferState m_bufferState;
VertexArrayState m_vertexArrayState;
Array<CurrentVertexAttributeValue, VertexArrayObject::MAX_VERTEX_ATTRIBS> m_currentVertexAttributes{};
Bool m_transformFeedbackActive = false;
GLenum m_transformFeedbackPrimitiveMode = GL_POINTS;
SharedPtr<ProgramObject> m_transformFeedbackProgram;
TextureState m_textureState;
ProgramState m_programState;
RenderState m_renderState;