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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/Buffer/GL_Buffer.cpp
+16
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@@ -1351,6 +1351,14 @@ namespace MobileGL::MG_Impl::GLImpl {
BufferTarget bufferTarget = MG_Util::ConvertGLEnumToBufferTarget(target);
if (!BufferImpl::ValidateBufferBindingPointTarget(bufferTarget)) return;
if (!BufferImpl::ValidateBufferBindingPointIndex(bufferTarget, pointIndex)) return;
if (bufferTarget == BufferTarget::TransformFeedback && MG_State::pGLContext->IsTransformFeedbackActive()) {
MG_State::pGLContext->RecordError(
ErrorCode::InvalidOperation,
MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
"Transform feedback buffer bindings cannot change while transform "
"feedback is active."));
return;
}
MG_State::pGLContext->TouchBufferBindingPoint(bufferTarget, pointIndex);
auto& point = MG_State::pGLContext->GetBufferBindingPoint(bufferTarget, pointIndex);
@@ -1384,6 +1392,14 @@ namespace MobileGL::MG_Impl::GLImpl {
BufferTarget bufferTarget = MG_Util::ConvertGLEnumToBufferTarget(target);
if (!BufferImpl::ValidateBufferBindingPointTarget(bufferTarget)) return;
if (!BufferImpl::ValidateBufferBindingPointIndex(bufferTarget, index)) return;
if (bufferTarget == BufferTarget::TransformFeedback && MG_State::pGLContext->IsTransformFeedbackActive()) {
MG_State::pGLContext->RecordError(
ErrorCode::InvalidOperation,
MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
"Transform feedback buffer bindings cannot change while transform "
"feedback is active."));
return;
}
MG_State::pGLContext->TouchBufferBindingPoint(bufferTarget, index);
auto& point = MG_State::pGLContext->GetBufferBindingPoint(bufferTarget, index);