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[Fix, Test] (GLImpl, MG_IntegrationTest): enforce the tessellation draw-mode rules and waive the XFB mode match for it

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swung0x48
2026-08-21 00:23:15 -04:00
parent a687fc4577
commit aed10f65a6
3 changed files with 264 additions and 7 deletions
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MobileGL/MG_Impl/GLImpl/Drawing/GL_Drawing.cpp
+37 -7
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@@ -199,11 +199,37 @@ namespace MobileGL::MG_Impl::GLImpl {
return false;
}
const auto& currentProgram = MG_State::pGLContext->GetProgramForDraw();
// GL 4.6 core 10.1: the tessellation pipeline's only input primitive is GL_PATCHES, and
// GL_PATCHES has no meaning without it. Both directions are INVALID_OPERATION, and
// neither was implemented - which is two of the four sites
// KHR-GL43.transform_feedback.api_errors_test checks with one shared message string.
// The EVALUATION stage is what decides: a control stage cannot run without one, and a
// program carrying only an evaluation stage still tessellates, through GL's
// fixed-function pass-through control stage (11.2.2).
const Bool tessellationActive =
currentProgram && currentProgram->GetShaderIndexByStage(ShaderStage::TessEval) >= 0;
if (tessellationActive && mode != GL_PATCHES) {
MG_State::pGLContext->RecordError(
ErrorCode::InvalidOperation,
MakeUnique<GenericErrorInfo>(
"MG_Impl/GLImpl", functionName,
"A program with a tessellation evaluation shader can only be drawn with GL_PATCHES."));
return false;
}
if (!tessellationActive && mode == GL_PATCHES) {
MG_State::pGLContext->RecordError(
ErrorCode::InvalidOperation,
MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", functionName,
"GL_PATCHES requires an active tessellation evaluation shader."));
return false;
}
// A geometry stage only accepts the primitive types that decompose into its declared
// input primitive (GL 4.6 core 11.3.1); anything else is INVALID_OPERATION. GL_PATCHES
// is the tessellation pipeline's input and reaches the geometry stage already
// converted, so it is not constrained here.
const auto& currentProgram = MG_State::pGLContext->GetProgramForDraw();
const GLenum gsInput = currentProgram ? currentProgram->GetGeometryInputType() : GL_NONE;
if (gsInput != GL_NONE && mode != GL_PATCHES) {
Bool compatible = false;
@@ -239,13 +265,17 @@ namespace MobileGL::MG_Impl::GLImpl {
// While transform feedback is active the draw's primitive type must match
// the feedback primitive mode (GL 3.3 core 13.2.2). With a geometry shader
// the constraint moves to the shader's output primitive type instead, so
// the draw mode itself is unconstrained here. A paused span is exempt: it
// captures nothing, so there is nothing for the mode to be incompatible with
// (GL 4.6 core 13.2.3).
// the draw mode itself is unconstrained here - and a TESSELLATION EVALUATION
// stage relocates it exactly the same way (GL 4.6 core 13.2.2 names both):
// what is captured is the tessellator's output primitive, and the draw mode
// can only ever be GL_PATCHES. A paused span is exempt: it captures nothing,
// so there is nothing for the mode to be incompatible with (GL 4.6 core 13.2.3).
const auto& feedbackProgram = MG_State::pGLContext->GetTransformFeedbackProgram();
const Bool feedbackModeIsProgramDriven =
feedbackProgram && (feedbackProgram->GetShaderIndexByStage(ShaderStage::Geometry) >= 0 ||
feedbackProgram->GetShaderIndexByStage(ShaderStage::TessEval) >= 0);
if (MG_State::pGLContext->IsTransformFeedbackActive() &&
!MG_State::pGLContext->IsTransformFeedbackPaused() &&
!(MG_State::pGLContext->GetTransformFeedbackProgram() &&
MG_State::pGLContext->GetTransformFeedbackProgram()->GetShaderIndexByStage(ShaderStage::Geometry) >= 0)) {
!MG_State::pGLContext->IsTransformFeedbackPaused() && !feedbackModeIsProgramDriven) {
const GLenum feedbackMode = MG_State::pGLContext->GetTransformFeedbackPrimitiveMode();
Bool compatible = false;
switch (feedbackMode) {