effect.cg

struct output{
	float4 color : COLOR;
};

output main(float2 position : POSITION, float2 texCoord : TEXCOORD, uniform float sze, uniform sampler2D lastTex, uniform float var1)
{
	output OUT;
	float4 lastCol = tex2D(lastTex, texCoord);
	if(dot(lastCol, lastCol) > 1){
		OUT.color = lastCol - 0.002;
		return OUT;
	}
	float d = 1.0 / sze;
	int upCount = tex2D(lastTex, float2(texCoord.x - d, texCoord.y - d)).b +
				  tex2D(lastTex, float2(texCoord.x, texCoord.y - d)).b +
				  tex2D(lastTex, float2(texCoord.x + d, texCoord.y - d)).b +
				  tex2D(lastTex, float2(texCoord.x - d, texCoord.y)).b +
				  tex2D(lastTex, float2(texCoord.x + d, texCoord.y)).b + 
				  tex2D(lastTex, float2(texCoord.x - d, texCoord.y + d)).b +
				  tex2D(lastTex, float2(texCoord.x, texCoord.y + d)).b + 
				  tex2D(lastTex, float2(texCoord.x + d, texCoord.y + d)).b;
	if(upCount == 1 || (upCount > 5 && upCount < 7)){
		float col = (float)upCount/8.0;
		OUT.color = float4(col, 2*col, 1, 1);
	}
	else{
		OUT.color = float4(0, 0, 0, 1);
	}
	return OUT;
}