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[Fix] (Magma): ignore shader gl_SampleMask without multisample fragment ops

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swung0x48
2026-10-12 19:37:25 -04:00
parent 05d58a566a
commit 065d1582ba
13 changed files with 402 additions and 5 deletions
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MobileGL/MG_Backend/DirectVulkan/Renderer/ProgramFactory.cpp
+19
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@@ -4024,6 +4024,25 @@ namespace MobileGL::MG_Backend::DirectVulkan {
}
}
if (!entry.nonLayeredStages.empty()) entry.nonLayeredStages.push_back(nonLayeredStage);
// GL ignores gl_SampleMask without multisample fragment operations; Vulkan discards
// a fragment whose one-sample mask has bit 0 clear. A fragment stage that stores it
// gets a second module storing all-ones for those draws (FullCoverageSampleMaskPass).
if (shaderStage == ShaderStage::Fragment) {
Vector<Uint> fullCoverageSpv;
if (MG_Util::ShaderTranspiler::ShaderCompiler::FullCoverageSampleMaskForVulkan(
moduleSpv, fullCoverageSpv, enableSpirvValidation) &&
!fullCoverageSpv.empty() && fullCoverageSpv != moduleSpv) {
VkShaderModuleCreateInfo fullCoverageInfo{VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO};
fullCoverageInfo.codeSize = fullCoverageSpv.size() * sizeof(Uint);
fullCoverageInfo.pCode = fullCoverageSpv.data();
VkShaderModule fullCoverageModule = VK_NULL_HANDLE;
VK_VERIFY(vkCreateShaderModule(m_device, &fullCoverageInfo, nullptr, &fullCoverageModule),
"vkCreateShaderModule(full-coverage gl_SampleMask)");
entry.modules.push_back(fullCoverageModule);
entry.fullCoverageFragmentModule = fullCoverageModule;
}
}
}
// Reflect and create layout as part of the program object