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[Fix] (Magma): zero gl_Layer in draws into a non-layered framebuffer

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swung0x48
2026-10-12 18:28:13 -04:00
parent 53f3b7a9af
commit 6129d6e463
14 changed files with 361 additions and 4 deletions
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MobileGL/MG_Backend/DirectVulkan/Renderer/ProgramFactory.cpp
+26
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@@ -3998,6 +3998,32 @@ namespace MobileGL::MG_Backend::DirectVulkan {
entry.stageSpirvDigests.push_back(ShaderStageSpirvDigest{
static_cast<Uint32>(stage.stage), static_cast<Uint32>(moduleSpv.size()),
XXH64(moduleSpv.data(), moduleSpv.size() * sizeof(Uint), 0)});
// GL ignores gl_Layer when the framebuffer is not layered; Vulkan leaves a Layer at or
// past the framebuffer's layer count undefined. A stage that stores it gets a second
// module storing 0 for draws into a non-layered framebuffer (ZeroLayerOutputPass).
VkPipelineShaderStageCreateInfo nonLayeredStage = stage;
if (shaderStage == ShaderStage::Vertex || shaderStage == ShaderStage::TessEval ||
shaderStage == ShaderStage::Geometry) {
Vector<Uint> zeroLayerSpv;
if (MG_Util::ShaderTranspiler::ShaderCompiler::ZeroLayerOutputForVulkan(moduleSpv, zeroLayerSpv,
enableSpirvValidation) &&
!zeroLayerSpv.empty() && zeroLayerSpv != moduleSpv) {
VkShaderModuleCreateInfo zeroLayerInfo{VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO};
zeroLayerInfo.codeSize = zeroLayerSpv.size() * sizeof(Uint);
zeroLayerInfo.pCode = zeroLayerSpv.data();
VkShaderModule zeroLayerModule = VK_NULL_HANDLE;
VK_VERIFY(vkCreateShaderModule(m_device, &zeroLayerInfo, nullptr, &zeroLayerModule),
"vkCreateShaderModule(zero gl_Layer)");
entry.modules.push_back(zeroLayerModule);
nonLayeredStage.module = zeroLayerModule;
// Back-fill: every stage before this one is shared with `stages`.
if (entry.nonLayeredStages.empty()) {
entry.nonLayeredStages.assign(entry.stages.begin(), entry.stages.end() - 1);
}
}
}
if (!entry.nonLayeredStages.empty()) entry.nonLayeredStages.push_back(nonLayeredStage);
}
// Reflect and create layout as part of the program object