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Adjust alpha used for blending.

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This commit is contained in:
Jean-Philip Desjardins 2016-10-18 10:12:49 -04:00
parent 3b0b7814bd
commit 53eabaadc5
1 changed files with 5 additions and 0 deletions
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5
Source/ui_win32/GSH_Direct3D9_Shader.cpp
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@ -102,6 +102,7 @@ Nuanceur::CShaderBuilder CGSH_Direct3D9::GeneratePixelShader(SHADERCAPS caps)
//Temporaries //Temporaries
auto texCoord = CFloat2Lvalue(b.CreateTemporary()); auto texCoord = CFloat2Lvalue(b.CreateTemporary());
auto textureColor = CFloat4Lvalue(b.CreateTemporary()); auto textureColor = CFloat4Lvalue(b.CreateTemporary());
auto finalAlpha = CFloatLvalue(b.CreateTemporary());
texCoord = inputTexCoord->xy() / inputTexCoord->zz(); texCoord = inputTexCoord->xy() / inputTexCoord->zz();
textureColor = NewFloat4(b, 1, 1, 1, 1); textureColor = NewFloat4(b, 1, 1, 1, 1);
@ -129,7 +130,11 @@ Nuanceur::CShaderBuilder CGSH_Direct3D9::GeneratePixelShader(SHADERCAPS caps)
textureColor = Sample(clutTexture, NewFloat2(colorIndex, NewFloat(b, 0))); textureColor = Sample(clutTexture, NewFloat2(colorIndex, NewFloat(b, 0)));
} }
//For proper alpha blending, alpha has to be multiplied by 2 (0x80 -> 1.0)
//This has the side effect of not writing a proper value in the framebuffer (should write alpha "as is")
outputColor = inputColor * textureColor; outputColor = inputColor * textureColor;
finalAlpha = Saturate(outputColor->w() * NewFloat(b, 2));
outputColor = NewFloat4(outputColor->xyz(),finalAlpha);
} }
return b; return b;