[nzsl_version("1.0")]
module;

import VertOut, VertexShader from Engine.FullscreenVertex;
import ViewerData from Engine.ViewerData;

external
{
	[set(0), binding(0)] viewerData: uniform[ViewerData],
	[set(0), binding(1)] inputTexture: sampler2D[f32]
}

struct FragOut
{
	[location(0)] color: vec4[f32]
}

[entry(frag)]
fn main(input: VertOut) -> FragOut
{
	let exposure = 0.8;

	let hdrColor = inputTexture.Sample(input.uv).rgb;

	// reinhard tone mapping
	let mapped = vec3[f32](1.0, 1.0, 1.0) - exp(-hdrColor * exposure);

	let output: FragOut;
	output.color = vec4[f32](mapped, 1.0);

	return output;
}