Contour.txt

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// from mpc-hc

sampler s0 : register(s0);
float4 p0 : register(c0);

#define width (p0[0])
#define height (p0[1])

float4 main(float2 tex : TEXCOORD0) : COLOR
{
	float dx = 4/width;
	float dy = 4/height;
	
	float4 c2 = tex2D(s0, tex + float2(0,-dy));
	float4 c4 = tex2D(s0, tex + float2(-dx,0));
	float4 c5 = tex2D(s0, tex + float2(0,0));
	float4 c6 = tex2D(s0, tex + float2(dx,0));
	float4 c8 = tex2D(s0, tex + float2(0,dy));
	
	float4 c0 = (-c2-c4+c5*4-c6-c8);
	if(length(c0) < 1.0) c0 = float4(0,0,0,0);
	else c0 = float4(1,1,1,0);
	
	return c0;
}

Contour.txt

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