import postprocess;
import ambientocclusion;

////// fragment
void main()
{
	float sample = depth_ratio.x/(texture(depth, texcoord).r-depth_ratio.y);
	float sum = 1.0;
	float count = 1.0;
	for(int i=0; i<=3; ++i)
		for(int j=0; j<=3; ++j)
		{
			vec2 offs = vec2(float(i)-1.5, float(j)-1.5)/screen_size;
			float dxy = length(offs)*-sample;
			float dz = depth_ratio.x/(texture(depth, texcoord+offs).r-depth_ratio.y)-sample;
			if(abs(dz)<3.0*dxy)
			{
				sum += texture(occlusion, texcoord+offs).r;
				count += 1.0;
			}
		}
	frag_color = texture(source, texcoord)*sum/count;
}