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[vulkan] Fixed dual-source blending to correctly map shader outputs. (#3637)

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Fixes Skyward Sword HD eye gitch and a related MoltenVK crash due to the incorrect output mapping. Verified working on mac and android.

The test in vk_pipeline_cache.cpp is a bit ugly, but it didn't seem worth it to go lambda/macro just to make it look cleaner. Could change if necessary.

Co-authored-by: tarako <none@none.com>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3637
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Co-authored-by: tarako <r76036296@gmail.com>
Co-committed-by: tarako <r76036296@gmail.com>
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tarako 2026-03-03 01:54:57 +01:00 • committed by crueter
parent 464212393e
commit d720a7b4b4
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4 changed files with 58 additions and 4 deletions
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15
src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
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@ -1670,13 +1670,22 @@ void EmitContext::DefineOutputs(const IR::Program& program) {
break;
case Stage::Fragment:
for (u32 index = 0; index < 8; ++index) {
if (!info.stores_frag_color[index] && !profile.need_declared_frag_colors) {
const bool need_dual_source = runtime_info.dual_source_blend && index <= 1;
if (!need_dual_source && !info.stores_frag_color[index] &&
!profile.need_declared_frag_colors) {
continue;
}
const Id type{GetAttributeType(*this, runtime_info.color_output_types[index])};
frag_color[index] = DefineOutput(*this, type, std::nullopt);
Decorate(frag_color[index], spv::Decoration::Location, index);
Name(frag_color[index], fmt::format("frag_color{}", index));
// Correct mapping for dual-source blending
if (runtime_info.dual_source_blend && index <= 1) {
Decorate(frag_color[index], spv::Decoration::Location, 0u);
Decorate(frag_color[index], spv::Decoration::Index, index);
Name(frag_color[index], index == 0 ? "frag_color0" : "frag_color0_secondary");
} else {
Decorate(frag_color[index], spv::Decoration::Location, index);
Name(frag_color[index], fmt::format("frag_color{}", index));
}
}
if (info.stores_frag_depth) {
frag_depth = DefineOutput(*this, F32[1], std::nullopt);