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- /*
- YV12 chroma upsampling fixer
- by Kurt Bernhard 'Leak' Pruenner
-
- Use with YV12 output if the half-resolution chroma
- gets upsampled in hardware by doubling the values
- instead of interpolating between them.
-
- (i.e. if you're getting blocky red edges on dark
- backgrounds...)
- */
-
- sampler s0 : register(s0);
- float4 p0 : register(c0);
- float4 p1 : register(c1);
-
- #define width (p0[0])
- #define height (p0[1])
-
- float4 getPixel(float2 tex, float dx, float dy)
- {
- tex.x+=dx;
- tex.y+=dy;
-
- return tex2D(s0, tex);
- }
-
- float4 rgb2yuv(float4 rgb)
- {
- float4x4 coeffs=
- {
- 0.299, 0.587, 0.114, 0.000,
- -0.147,-0.289, 0.436, 0.000,
- 0.615,-0.515,-0.100, 0.000,
- 0.000, 0.000, 0.000, 0.000
- };
-
- return mul(coeffs,rgb);
- }
-
- float4 yuv2rgb(float4 yuv)
- {
- float4x4 coeffs=
- {
- 1.000, 0.000, 1.140, 0.000,
- 1.000,-0.395,-0.581, 0.000,
- 1.000, 2.032, 0.000, 0.000,
- 0.000, 0.000, 0.000, 0.000
- };
-
- return mul(coeffs,yuv);
- }
-
- float4 main(float2 tex : TEXCOORD0) : COLOR
- {
- float dx=1/width;
- float dy=1/height;
-
- float4 yuv00=rgb2yuv(getPixel(tex,-dx,-dy));
- float4 yuv01=rgb2yuv(getPixel(tex,-dx, 0));
- float4 yuv02=rgb2yuv(getPixel(tex,-dx, dy));
- float4 yuv10=rgb2yuv(getPixel(tex, 0,-dy));
- float4 yuv11=rgb2yuv(getPixel(tex, 0, 0));
- float4 yuv12=rgb2yuv(getPixel(tex, 0, dy));
- float4 yuv20=rgb2yuv(getPixel(tex, dx,-dy));
- float4 yuv21=rgb2yuv(getPixel(tex, dx, 0));
- float4 yuv22=rgb2yuv(getPixel(tex, dx, dy));
-
- float4 yuv=
- (yuv00*1+yuv01*2+yuv02*1+
- yuv10*2+yuv11*4+yuv12*2+
- yuv20*1+yuv21*2+yuv22*1)/16;
-
- yuv.r=yuv11.r;
-
- return yuv2rgb(yuv);
- }