forked from suyu/suyu
Pica/Rasterizer: Implement alpha blending.
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1 changed files with 84 additions and 0 deletions
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@ -25,6 +25,18 @@ static void DrawPixel(int x, int y, const Math::Vec4<u8>& color) {
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*(color_buffer + x + y * registers.framebuffer.GetWidth()) = value;
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}
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static const Math::Vec4<u8> GetPixel(int x, int y) {
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u32* color_buffer_u32 = reinterpret_cast<u32*>(Memory::GetPointer(PAddrToVAddr(registers.framebuffer.GetColorBufferPhysicalAddress())));
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u32 value = *(color_buffer_u32 + x + y * registers.framebuffer.GetWidth());
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Math::Vec4<u8> ret;
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ret.a() = value >> 24;
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ret.r() = (value >> 16) & 0xFF;
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ret.g() = (value >> 8) & 0xFF;
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ret.b() = value & 0xFF;
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return ret;
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}
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static u32 GetDepth(int x, int y) {
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u16* depth_buffer = reinterpret_cast<u16*>(Memory::GetPointer(PAddrToVAddr(registers.framebuffer.GetDepthBufferPhysicalAddress())));
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@ -430,6 +442,78 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
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SetDepth(x >> 4, y >> 4, z);
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}
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auto dest = GetPixel(x >> 4, y >> 4);
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if (registers.output_merger.alphablend_enable) {
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auto params = registers.output_merger.alpha_blending;
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auto LookupFactorRGB = [&](decltype(params)::BlendFactor factor) -> Math::Vec3<u8> {
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switch(factor) {
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case params.Zero:
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return Math::Vec3<u8>(0, 0, 0);
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case params.One:
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return Math::Vec3<u8>(255, 255, 255);
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case params.SourceAlpha:
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return Math::MakeVec(combiner_output.a(), combiner_output.a(), combiner_output.a());
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case params.OneMinusSourceAlpha:
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return Math::Vec3<u8>(255-combiner_output.a(), 255-combiner_output.a(), 255-combiner_output.a());
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default:
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LOG_CRITICAL(HW_GPU, "Unknown color blend factor %x", factor);
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exit(0);
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break;
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}
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};
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auto LookupFactorA = [&](decltype(params)::BlendFactor factor) -> u8 {
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switch(factor) {
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case params.Zero:
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return 0;
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case params.One:
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return 255;
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case params.SourceAlpha:
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return combiner_output.a();
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case params.OneMinusSourceAlpha:
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return 255 - combiner_output.a();
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default:
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LOG_CRITICAL(HW_GPU, "Unknown alpha blend factor %x", factor);
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exit(0);
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break;
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}
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};
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auto srcfactor = Math::MakeVec(LookupFactorRGB(params.factor_source_rgb),
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LookupFactorA(params.factor_source_a));
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auto dstfactor = Math::MakeVec(LookupFactorRGB(params.factor_dest_rgb),
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LookupFactorA(params.factor_dest_a));
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switch (params.blend_equation_rgb) {
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case params.Add:
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{
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auto result = (combiner_output * srcfactor + dest * dstfactor) / 255;
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result.r() = std::min(255, result.r());
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result.g() = std::min(255, result.g());
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result.b() = std::min(255, result.b());
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combiner_output = result.Cast<u8>();
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break;
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}
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default:
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LOG_CRITICAL(HW_GPU, "Unknown RGB blend equation %x", params.blend_equation_rgb.Value());
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exit(0);
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}
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} else {
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LOG_CRITICAL(HW_GPU, "logic op: %x", registers.output_merger.logic_op);
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exit(0);
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}
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DrawPixel(x >> 4, y >> 4, combiner_output);
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}
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}
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