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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_Impl/GLImpl/Program/GL_Program.h
+3
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@@ -138,4 +138,7 @@ namespace MobileGL::MG_Impl::GLImpl {
GLint GetProgramResourceLocationIndex(GLuint program, GLenum programInterface, const GLchar* name);
void ShaderStorageBlockBinding(GLuint program, GLuint storageBlockIndex, GLuint storageBlockBinding);
void ValidateProgram(GLuint program);
void TransformFeedbackVaryings(GLuint program, GLsizei count, const GLchar* const* varyings, GLenum bufferMode);
void GetTransformFeedbackVarying(GLuint program, GLuint index, GLsizei bufSize, GLsizei* length, GLsizei* size,
GLenum* type, GLchar* name);
} // namespace MobileGL::MG_Impl::GLImpl