sum_density.cg

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void main(fixed2 coord : TEXCOORD0,
		  uniform samplerRECT rect : TEXUNIT0,
		  uniform int len,
		  out float3 result : COLOR)
{
	float density = 0.0;
	for (int i = 0; i < len; i++)
		density += f1texRECT(rect, coord + float2(i, 0));
	result = float3(1.0/density, 150000.0f*max(density - 1000.0f, 0.0), 0);
}