struct Varying {
	@location(0) uv: vec2f,
	@builtin(position) screen: vec4f,
}

@vertex
fn on_vertex(@builtin(vertex_index) vi: u32) -> Varying {
	let uv = vec2f(vec2(vi, vi >> 1u) & vec2(1u));
	let screen = vec4(uv * 2. - 1., 0., 1.);
	return Varying(vec2(uv.x, 1. - uv.y), screen);
}

@group(0) @binding(0) var field: texture_2d<u32>;

@fragment
fn on_fragment(in: Varying) -> @location(0) vec4f {
	let pos = vec2u(in.screen.xy);
	let state = textureLoad(field, pos, 0).x;
	return vec4f(f32(state));
}