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Fix incorrect clamping in SWRenderer.

Browse source 
A previous PR changed a whole lot of min/maxes to std::min/std::max
but made a mistake here and used a templated min which cast it's
arguments to unsigned instead of casting return value.

This resulted in glitchy artifacts in bright areas (See issue 7439)

I rewrote the code to use a proper clamping function so it's cleaner
to read.
This commit is contained in:
Scott Mansell 2014-07-15 00:42:33 +12:00
parent 3ac4e9f171
commit b8695a57da
3 changed files with 20 additions and 20 deletions
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12
Source/Core/VideoBackends/Software/SWRenderer.cpp
View file

@ -182,14 +182,14 @@ void SWRenderer::UpdateColorTexture(EfbInterface::yuv422_packed *xfb, u32 fbWidt
// We do the inverse BT.601 conversion for YCbCr to RGB
// http://www.equasys.de/colorconversion.html#YCbCr-RGBColorFormatConversion
TexturePointer[offset++] = std::min<u8>(255.0f, std::max(0.0f, 1.164f * Y1 + 1.596f * V));
TexturePointer[offset++] = std::min<u8>(255.0f, std::max(0.0f, 1.164f * Y1 - 0.392f * U - 0.813f * V));
TexturePointer[offset++] = std::min<u8>(255.0f, std::max(0.0f, 1.164f * Y1 + 2.017f * U ));
TexturePointer[offset++] = MathUtil::Clamp(int(1.164f * Y1 + 1.596f * V), 0, 255);
TexturePointer[offset++] = MathUtil::Clamp(int(1.164f * Y1 - 0.392f * U - 0.813f * V), 0, 255);
TexturePointer[offset++] = MathUtil::Clamp(int(1.164f * Y1 + 2.017f * U ), 0, 255);
TexturePointer[offset++] = 255;
TexturePointer[offset++] = std::min<u8>(255.0f, std::max(0.0f, 1.164f * Y2 + 1.596f * V));
TexturePointer[offset++] = std::min<u8>(255.0f, std::max(0.0f, 1.164f * Y2 - 0.392f * U - 0.813f * V));
TexturePointer[offset++] = std::min<u8>(255.0f, std::max(0.0f, 1.164f * Y2 + 2.017f * U ));
TexturePointer[offset++] = MathUtil::Clamp(int(1.164f * Y2 + 1.596f * V), 0, 255);
TexturePointer[offset++] = MathUtil::Clamp(int(1.164f * Y2 - 0.392f * U - 0.813f * V), 0, 255);
TexturePointer[offset++] = MathUtil::Clamp(int(1.164f * Y2 + 2.017f * U ), 0, 255);
TexturePointer[offset++] = 255;
}
xfb += fbWidth;