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VideoCommon: simplify dither calculation

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This saves three instructions on AMD GPUs. Dunno about Nvidia.
This commit is contained in:
Tillmann Karras 2025-02-11 17:32:25 +00:00
parent c770e7c276
commit 5db6bd6054
2 changed files with 4 additions and 4 deletions
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4
Source/Core/VideoCommon/PixelShaderGen.cpp
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@ -1308,9 +1308,9 @@ ShaderCode GeneratePixelShaderCode(APIType api_type, const ShaderHostConfig& hos
if (uid_data->dither)
{
// Flipper uses a standard 2x2 Bayer Matrix for 6 bit dithering
// Here the matrix is encoded into the two factor constants
out.Write("\tint2 dither = int2(rawpos.xy) & 1;\n");
out.Write("\tprev.rgb = (prev.rgb - (prev.rgb >> 6)) + abs(dither.y * 3 - dither.x * 2);\n");
out.Write(
"\tprev.rgb = (prev.rgb - (prev.rgb >> 6)) + (dither.x ^ dither.y) * 2 + dither.y;\n");
}
WriteFog(out, uid_data);

4
Source/Core/VideoCommon/UberShaderPixel.cpp
View File

@ -1434,8 +1434,8 @@ ShaderCode GenPixelShader(APIType api_type, const ShaderHostConfig& host_config,
" // Flipper uses a standard 2x2 Bayer Matrix for 6 bit dithering\n"
" // Here the matrix is encoded into the two factor constants\n"
" int2 dither = int2(rawpos.xy) & 1;\n"
" TevResult.rgb = (TevResult.rgb - (TevResult.rgb >> 6)) + abs(dither.y * 3 - "
"dither.x * 2);\n"
" TevResult.rgb = (TevResult.rgb - (TevResult.rgb >> 6)) + (dither.x ^ dither.y) * "
"2 + dither.y;\n"
" }}\n\n");
// =========