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Add notes about precision of YUV->RGB conversion factors for XFB

This commit is contained in:
Pokechu22 2022-02-22 20:42:23 -08:00
parent 2f43889141
commit a6e06f38ad
2 changed files with 6 additions and 0 deletions
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2
Source/Core/VideoCommon/TextureConversionShader.cpp
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@ -968,6 +968,8 @@ static const std::map<TextureFormat, DecodingShaderInfo> s_decoding_shader_info{
// We do the inverse BT.601 conversion for YCbCr to RGB
// http://www.equasys.de/colorconversion.html#YCbCr-RGBColorFormatConversion
// TODO: Use more precise numbers for this conversion (although on real hardware, the XFB isn't
// in a real texture format, so does this conversion actually ever happen?)
{TextureFormat::XFB,
{TEXEL_BUFFER_FORMAT_RGBA8_UINT, 0, 8, 8, false,
R"(

4
Source/Core/VideoCommon/TextureDecoder_Common.cpp
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@ -629,6 +629,8 @@ void TexDecoder_DecodeTexel(u8* dst, const u8* src, int s, int t, int imageWidth
// We do the inverse BT.601 conversion for YCbCr to RGB
// http://www.equasys.de/colorconversion.html#YCbCr-RGBColorFormatConversion
// TODO: Use more precise numbers for this conversion (although on real hardware, the XFB isn't
// in a real texture format, so does this conversion actually ever happen?)
u8 R = std::clamp(int(1.164f * Y + 1.596f * V), 0, 255);
u8 G = std::clamp(int(1.164f * Y - 0.392f * U - 0.813f * V), 0, 255);
u8 B = std::clamp(int(1.164f * Y + 2.017f * U), 0, 255);
@ -694,6 +696,8 @@ void TexDecoder_DecodeXFB(u8* dst, const u8* src, u32 width, u32 height, u32 str
// We do the inverse BT.601 conversion for YCbCr to RGB
// http://www.equasys.de/colorconversion.html#YCbCr-RGBColorFormatConversion
// TODO: Use more precise numbers for this conversion (although on real hardware, the XFB
// isn't in a real texture format, so does this conversion actually ever happen?)
u8 R1 = static_cast<u8>(std::clamp(int(1.164f * Y1 + 1.596f * V), 0, 255));
u8 G1 = static_cast<u8>(std::clamp(int(1.164f * Y1 - 0.392f * U - 0.813f * V), 0, 255));
u8 B1 = static_cast<u8>(std::clamp(int(1.164f * Y1 + 2.017f * U), 0, 255));