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[Fix, Test] (BackendLoader, DirectGLES, DirectVulkan, GLImpl): answer the layer and viewport-index provoking-vertex conventions from the backend

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swung0x48
2026-08-20 15:40:25 -04:00
parent 51883cf1a3
commit d24d5b5ccd
8 changed files with 205 additions and 6 deletions
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MobileGL/MG_Impl/GLImpl/Getter/GL_Getter.cpp
+14 -6
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@@ -1572,9 +1572,6 @@ namespace MobileGL::MG_Impl::GLImpl {
case GL_LINE_WIDTH:
*params = static_cast<GLint>(MG_State::pGLContext->GetLineWidth());
return;
case GL_LAYER_PROVOKING_VERTEX:
*params = GL_LAST_VERTEX_CONVENTION;
return;
case GL_LOGIC_OP_MODE:
*params = static_cast<GLint>(MG_Util::ConvertLogicOperationToGLEnum(MG_State::pGLContext->GetLogicOp()));
return;
@@ -2117,9 +2114,6 @@ namespace MobileGL::MG_Impl::GLImpl {
params[3] = vp.w();
return;
}
case GL_VIEWPORT_INDEX_PROVOKING_VERTEX:
*params = GL_LAST_VERTEX_CONVENTION;
return;
case GL_MAX_ELEMENT_INDEX:
*params = 1024 * 1024; // TODO
return;
@@ -2207,6 +2201,20 @@ namespace MobileGL::MG_Impl::GLImpl {
case GL_MAX_CLIP_DISTANCES:
*params = dynamicParameters.MaxClipDistances;
break;
// Both were a hard-coded GL_LAST_VERTEX_CONVENTION, derived from nothing. GL 4.6 table
// 23.65 permits GL_UNDEFINED_VERTEX for either, and that is what the backends report
// wherever they do not actually pin a convention - claiming one is a statement about
// which vertex of a primitive supplies gl_Layer / gl_ViewportIndex, and DirectGLES
// rasterizes only viewport 0 on a driver without GL_OES_viewport_array while
// DirectVulkan picks its provoking mode per pipeline. KHR-GLxx.viewport_array.query
// accepts all four values, and .provoking_vertex - which failed on both devices, in
// OPPOSITE directions - stops verifying as soon as either answer is undefined.
case GL_LAYER_PROVOKING_VERTEX:
*params = static_cast<GLint>(dynamicParameters.LayerProvokingVertex);
break;
case GL_VIEWPORT_INDEX_PROVOKING_VERTEX:
*params = static_cast<GLint>(dynamicParameters.ViewportIndexProvokingVertex);
break;
case GL_MAX_COLOR_TEXTURE_SAMPLES:
*params = std::max(dynamicParameters.MaxColorTextureSamples, GetAdvertisedMaxSamples());
break;