#[set(everything)]
const constants: {
	screen_size_inv: float2;
};

#[set(everything)]
const sampler_linear: sampler;

#[set(everything)]
const tex: tex2d;

struct vert_in {
	pos: float2;
}

struct vert_out {
	pos: float4;
	tex: float2;
}

fun supersample_resolve_vert(input: vert_in): vert_out {
	var output: vert_out;
	output.tex = input.pos.xy * 0.5 + 0.5;
	output.tex.y = 1.0 - output.tex.y;
	output.pos = float4(input.pos.xy, 0.0, 1.0);
	return output;
}

fun supersample_resolve_frag(input: vert_out): float4 {
	// 4X resolve
	var tex_step: float2 = constants.screen_size_inv / 4.0;
	var col: float4 = sample(tex, sampler_linear, input.tex);
	col += sample(tex, sampler_linear, input.tex + float2(1.5, 0.0) * tex_step);
	col += sample(tex, sampler_linear, input.tex + float2(-1.5, 0.0) * tex_step);
	col += sample(tex, sampler_linear, input.tex + float2(0.0, 1.5) * tex_step);
	col += sample(tex, sampler_linear, input.tex + float2(0.0, -1.5) * tex_step);
	col += sample(tex, sampler_linear, input.tex + float2(1.5, 1.5) * tex_step);
	col += sample(tex, sampler_linear, input.tex + float2(-1.5, -1.5) * tex_step);
	col += sample(tex, sampler_linear, input.tex + float2(1.5, -1.5) * tex_step);
	col += sample(tex, sampler_linear, input.tex + float2(-1.5, 1.5) * tex_step);
	return col / 9.0;
}

#[pipe]
struct pipe {
	vertex = supersample_resolve_vert;
	fragment = supersample_resolve_frag;
}