#pragma MSP stage(compute)
layout(local_size_x=8, local_size_y=8) in;

uniform sampler2D variance_in;
layout(r16f) uniform image2D variance_out;

void main()
{
	ivec2 coord = ivec2(gl_GlobalInvocationID.xy)+ivec2(1, 4);
	float variance = 0.0;
	for(int i=-3; i<=3; ++i)
		variance += texelFetch(variance_in, coord+ivec2(0, i), 0).x;
	imageStore(variance_out, coord, vec4(variance/7.0, 0.0, 0.0, 0.0));
}