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shader_recompiler: Implement dual source blending (#3054)

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TheTurtle 2025-06-08 21:38:58 +03:00 • committed by GitHub
parent 2bc199a41b
commit 952cef5a15
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GPG key ID: B5690EEEBB952194
6 changed files with 47 additions and 4 deletions
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15
src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
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@ -634,7 +634,8 @@ void EmitContext::DefineOutputs() {
}
break;
}
case LogicalStage::Fragment:
case LogicalStage::Fragment: {
u32 num_render_targets = 0;
for (u32 i = 0; i < IR::NumRenderTargets; i++) {
const IR::Attribute mrt{IR::Attribute::RenderTarget0 + i};
if (!info.stores.GetAny(mrt)) {
@ -643,11 +644,21 @@ void EmitContext::DefineOutputs() {
const u32 num_components = info.stores.NumComponents(mrt);
const AmdGpu::NumberFormat num_format{runtime_info.fs_info.color_buffers[i].num_format};
const Id type{GetAttributeType(*this, num_format)[num_components]};
const Id id{DefineOutput(type, i)};
Id id;
if (runtime_info.fs_info.dual_source_blending) {
id = DefineOutput(type, 0);
Decorate(id, spv::Decoration::Index, i);
} else {
id = DefineOutput(type, i);
}
Name(id, fmt::format("frag_color{}", i));
frag_outputs[i] = GetAttributeInfo(num_format, id, num_components, true);
++num_render_targets;
}
ASSERT_MSG(!runtime_info.fs_info.dual_source_blending || num_render_targets == 2,
"Dual source blending enabled, there must be exactly two MRT exports");
break;
}
case LogicalStage::Geometry: {
output_position = DefineVariable(F32[4], spv::BuiltIn::Position, spv::StorageClass::Output);