ProjectArcade

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