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graphics: preserve logical alpha when blending reordered targets (PPSA02721)

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Co-authored-by: EmK530 <admin@emk530.net>
This commit is contained in:
nmzik
2026-09-29 19:48:07 +04:00
parent 6799ecbc5b
commit 73615c31ff
10 changed files with 280 additions and 20 deletions
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src/graphics/host_gpu/renderer/pipeline/shaders.cpp
+14 -8
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@@ -137,14 +137,17 @@ static void GetInputFormat(const ShaderBufferResource& res, vk::Format& format,
}
}
static vk::BlendFactor GetBlendFactor(uint32_t factor) {
static vk::BlendFactor GetBlendFactor(uint32_t factor, bool remap_source_alpha) {
switch (static_cast<Prospero::BlendFactor>(factor)) {
case Prospero::BlendFactor::kZero: return vk::BlendFactor::eZero;
case Prospero::BlendFactor::kOne: return vk::BlendFactor::eOne;
case Prospero::BlendFactor::kSrcColor: return vk::BlendFactor::eSrcColor;
case Prospero::BlendFactor::kOneMinusSrcColor: return vk::BlendFactor::eOneMinusSrcColor;
case Prospero::BlendFactor::kSrcAlpha: return vk::BlendFactor::eSrcAlpha;
case Prospero::BlendFactor::kOneMinusSrcAlpha: return vk::BlendFactor::eOneMinusSrcAlpha;
case Prospero::BlendFactor::kSrcAlpha:
return remap_source_alpha ? vk::BlendFactor::eSrc1Color : vk::BlendFactor::eSrcAlpha;
case Prospero::BlendFactor::kOneMinusSrcAlpha:
return remap_source_alpha ? vk::BlendFactor::eOneMinusSrc1Color
: vk::BlendFactor::eOneMinusSrcAlpha;
case Prospero::BlendFactor::kDstAlpha: return vk::BlendFactor::eDstAlpha;
case Prospero::BlendFactor::kOneMinusDstAlpha: return vk::BlendFactor::eOneMinusDstAlpha;
case Prospero::BlendFactor::kDstColor: return vk::BlendFactor::eDstColor;
@@ -397,17 +400,20 @@ void CreatePipelineInternal(GraphicContext& graphics, PipelineCache::Pipeline& p
color_blend_attachment[i].colorWriteMask =
vk::ColorComponentFlags {static_params.color_mask[i]};
color_blend_attachment[i].blendEnable = static_params.blend_enable[i] ? VK_TRUE : VK_FALSE;
// Only target 0 can use the second blend source carrying logical alpha.
const bool remap_source_alpha = i == 0 && static_params.blend_alpha_source_remap;
color_blend_attachment[i].srcColorBlendFactor =
GetBlendFactor(static_params.color_srcblend[i]);
GetBlendFactor(static_params.color_srcblend[i], remap_source_alpha);
color_blend_attachment[i].dstColorBlendFactor =
GetBlendFactor(static_params.color_destblend[i]);
GetBlendFactor(static_params.color_destblend[i], remap_source_alpha);
color_blend_attachment[i].colorBlendOp = GetBlendOp(static_params.color_comb_fcn[i]);
color_blend_attachment[i].srcAlphaBlendFactor =
(static_params.separate_alpha_blend[i] ? GetBlendFactor(static_params.alpha_srcblend[i])
: color_blend_attachment[i].srcColorBlendFactor);
(static_params.separate_alpha_blend[i]
? GetBlendFactor(static_params.alpha_srcblend[i], remap_source_alpha)
: color_blend_attachment[i].srcColorBlendFactor);
color_blend_attachment[i].dstAlphaBlendFactor =
(static_params.separate_alpha_blend[i]
? GetBlendFactor(static_params.alpha_destblend[i])
? GetBlendFactor(static_params.alpha_destblend[i], remap_source_alpha)
: color_blend_attachment[i].dstColorBlendFactor);
color_blend_attachment[i].alphaBlendOp =
(static_params.separate_alpha_blend[i] ? GetBlendOp(static_params.alpha_comb_fcn[i])