blob: d4fd1a0bcf3e672fe68ef8c874a689e3d931bf13 (
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void main()
{
float4 to_gray = float4(0.3,0.59,0.11,0);
float x1 = dot(to_gray, SampleOffset(int2( 1, 1)));
float x0 = dot(to_gray, SampleOffset(int2(-1,-1)));
float x3 = dot(to_gray, SampleOffset(int2( 1,-1)));
float x2 = dot(to_gray, SampleOffset(int2(-1, 1)));
float edge = (x1 - x0) * (x1 - x0) + (x3 - x2) * (x3 - x2);
float4 color = Sample();
SetOutput(color - float4(edge, edge, edge, edge) * 12.0);
}
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