uniform sampler2D tex;
vec2 hammersley(uint i, uint count)
{
	float y = bitfieldReverse(i)*2.3283064e-10;
	return vec2(float(i)/count, y);
}
const uint sample_count = 128;

#pragma MSP stage(vertex)
layout(location=0) in vec4 position;
void main()
{
	gl_Position = position;
	out vec2 texcoord = position.xy*0.5+0.5;
}

#pragma MSP stage(fragment)
layout(location=0) out vec4 frag_color;
void main()
{
	vec4 sum = vec4(0.0);
	for(int i=0; i<sample_count; ++i)
		sum += texture(tex, texcoord+pow(hammersley(i, sample_count), vec2(2.0)));
	frag_color = sum/sample_count;
}

/* Expected output: vertex
layout(location=0) in vec4 position;
layout(location=0) out vec2 texcoord;
void main()
{
	gl_Position = position;
	texcoord = position.xy*0.5+0.5;
}
*/

/* Expected output: fragment
layout(location=0, binding=71) uniform sampler2D tex;
layout(location=0) out vec4 frag_color;
layout(location=0) in vec2 texcoord;
void main()
{
	vec4 sum = vec4(0.0);
	for(int i=0; uint(i)<128u; ++i)
	{
		uint i_1 = uint(i);
		sum += texture(tex, texcoord+pow(vec2(float(i_1)/128.0, float(bitfieldReverse(i_1))*2.3283064e-10), vec2(2.0)));
	}
	frag_color = sum/128.0;
}
*/