[nzsl_version("1.0")]
module Compute.Sepia;

external
{
	[binding(0)] input_tex: texture2D[f32, readonly, rgba8],
	[binding(1)] output_tex: texture2D[f32, writeonly, rgba8]
}

struct Input
{
	[builtin(global_invocation_indices)] global_invocation_id: vec3[u32]
}

[entry(compute)]
[workgroup(32, 32, 1)]
fn main(input: Input)
{
	let indices = vec2[i32](input.global_invocation_id.xy);

	let inputColor = input_tex.Read(indices).rgb;

	let outputColor = vec4[f32]
	(
		inputColor.x * 0.393 + inputColor.y * 0.769 + inputColor.z * 0.189,
		inputColor.x * 0.349 + inputColor.y * 0.686 + inputColor.z * 0.168,
		inputColor.x * 0.372 + inputColor.y * 0.534 + inputColor.z * 0.131,
		1.0
	);

	output_tex.Write(indices, outputColor);
}