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gpu: fix separate alpha blending on swizzled render targets

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Co-authored-by: Çağatay Güçlü <33038942+defektu@users.noreply.github.com>
This commit is contained in:
nmzik
2026-10-04 21:46:38 +04:00
parent 45fab265d5
commit 0bef3fc0d3
11 changed files with 246 additions and 83 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterFlow.cpp
+16 -3
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@@ -459,7 +459,7 @@ void EmitSetAttribute(ValueEmitContext& ctx, const IR::Inst& inst) {
}
// Skip dormant color exports after their valid mask; MRT1 is reserved for logical alpha.
if (state.program.stage == ShaderType::Pixel && exp.kind == IR::ExportTargetKind::Mrt &&
exp.index != 0 && state.input_info.pixel->alpha_blend_source_remap) {
exp.index != 0 && state.input_info.pixel->alpha_blend_source != ShaderAlphaBlendSource::None) {
return;
}
EmitIfCondition(state, exec, [&]() {
@@ -503,14 +503,27 @@ void EmitSetAttribute(ValueEmitContext& ctx, const IR::Inst& inst) {
const auto vector_type = uint_output ? TypeU32Vector(state, 4) : TypeF32Vector(state, 4);
auto value = ExportVector(ctx, data, exp, uint_output);
if (state.program.stage == ShaderType::Pixel && exp.kind == IR::ExportTargetKind::Mrt &&
exp.index == 0 && !uint_output && state.input_info.pixel->alpha_blend_source_remap) {
exp.index == 0 && !uint_output &&
state.input_info.pixel->alpha_blend_source != ShaderAlphaBlendSource::None) {
// Broadcast logical alpha before swizzling the primary output.
const auto blend_output =
OutputVariableForExport(state, {.kind = IR::ExportTargetKind::Mrt, .index = 1});
if (blend_output != 0) {
const auto alpha = state.builder.AllocateId();
auto alpha = state.builder.AllocateId();
state.builder.AddFunction(spv::OpVectorShuffle, vector_type, alpha, value, value,
3u, 3u, 3u, 3u);
if (state.input_info.pixel->alpha_blend_source ==
ShaderAlphaBlendSource::SourceAlphaOne) {
const auto mapping = state.input_info.pixel->target_export_mapping[0];
for (uint32_t component = 0; component < 4; component++) {
if (mapping.Map(component) != 3u) continue;
const auto factors = state.builder.AllocateId();
state.builder.AddFunction(spv::OpCompositeInsert, vector_type, factors,
ConstantF32Value(state, 1.0f), alpha, component);
alpha = factors;
break;
}
}
state.builder.AddFunction(spv::OpStore, blend_output, alpha);
}
}