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gpu: fix zero-source alpha blending on swizzled 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 23:22:54 +04:00
parent 8274e517b2
commit 94e7d239dd
7 changed files with 35 additions and 10 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterFlow.cpp
+12 -3
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@@ -512,14 +512,23 @@ void EmitSetAttribute(ValueEmitContext& ctx, const IR::Inst& inst) {
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) {
uint32_t alpha_factor = 0;
switch (state.input_info.pixel->alpha_blend_source) {
case ShaderAlphaBlendSource::SourceAlphaOne:
alpha_factor = ConstantF32Value(state, 1.0f);
break;
case ShaderAlphaBlendSource::SourceAlphaZero:
alpha_factor = ConstantF32Value(state, 0.0f);
break;
default: break;
}
if (alpha_factor != 0) {
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_factor, alpha, component);
alpha = factors;
break;
}