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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/host_gpu/renderer/pipeline/blendMapping.cpp
+5 -2
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@@ -32,12 +32,15 @@ BlendMappingSupport ClassifyBlendMapping(const HW::BlendControl&
}
if (blend.separate_alpha_blend &&
blend.color_srcblend == static_cast<uint8_t>(Prospero::BlendFactor::kSrcAlpha) &&
blend.alpha_srcblend == static_cast<uint8_t>(Prospero::BlendFactor::kOne) &&
blend.color_destblend == static_cast<uint8_t>(Prospero::BlendFactor::kOneMinusSrcAlpha) &&
blend.alpha_destblend == blend.color_destblend &&
blend.color_comb_fcn == static_cast<uint8_t>(Prospero::BlendOp::kAdd) &&
blend.alpha_comb_fcn == blend.color_comb_fcn) {
return BlendMappingSupport::SourceAlphaOne;
switch (static_cast<Prospero::BlendFactor>(blend.alpha_srcblend)) {
case Prospero::BlendFactor::kZero: return BlendMappingSupport::SourceAlphaZero;
case Prospero::BlendFactor::kOne: return BlendMappingSupport::SourceAlphaOne;
default: break;
}
}
// Moving alpha requires the same equation for all channels.
if (blend.separate_alpha_blend && (blend.alpha_srcblend != blend.color_srcblend ||
src/graphics/host_gpu/renderer/pipeline/blendMapping.h
+1
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@@ -16,6 +16,7 @@ enum class BlendMappingSupport {
Direct,
SourceAlpha, // Requires logical alpha in the second blend source.
SourceAlphaOne, // Source alpha for RGB, one for alpha, with a shared destination equation.
SourceAlphaZero, // Source alpha for RGB, zero for alpha, with a shared destination equation.
Unsupported,
};
src/graphics/host_gpu/renderer/pipeline/pipelineCache.cpp
+4
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@@ -640,6 +640,9 @@ PipelineCache::GraphicsPrograms PipelineCache::GetGraphicsPrograms(
case BlendMappingSupport::SourceAlphaOne:
pixel_info.alpha_blend_source = ShaderAlphaBlendSource::SourceAlphaOne;
break;
case BlendMappingSupport::SourceAlphaZero:
pixel_info.alpha_blend_source = ShaderAlphaBlendSource::SourceAlphaZero;
break;
default: break;
}
if (pixel_info.alpha_blend_source != ShaderAlphaBlendSource::None) {
@@ -764,6 +767,7 @@ PipelineCache::Pipeline& PipelineCache::GetGraphicsPipeline(
blend.separate_alpha_blend = false;
break;
case ShaderAlphaBlendSource::SourceAlphaOne:
case ShaderAlphaBlendSource::SourceAlphaZero:
// The second source carries the mapped source factor; its alpha stays logical Sa.
blend.color_srcblend = static_cast<uint8_t>(Prospero::BlendFactor::kSrc1Color);
blend.color_destblend =
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;
}
src/graphics/shader/shader.h
+1 -1
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@@ -158,7 +158,7 @@ struct ShaderComputeInputInfo: ShaderWorkgroupInputInfo {
ShaderStageRuntime stage;
};
enum class ShaderAlphaBlendSource : uint8_t { None, SourceAlpha, SourceAlphaOne };
enum class ShaderAlphaBlendSource : uint8_t { None, SourceAlpha, SourceAlphaOne, SourceAlphaZero };
struct ShaderPixelInputInfo {
uint32_t interpolator_settings[32] = {0};