[layout(std140)]
struct ViewerData
{
	projectionMatrix: mat4[f32],
	invProjectionMatrix: mat4[f32],
	viewMatrix: mat4[f32],
	invViewMatrix: mat4[f32],
	viewProjMatrix: mat4[f32],
	invViewProjMatrix: mat4[f32],
	renderTargetSize: vec2[f32],
	invRenderTargetSize: vec2[f32],
	eyePosition: vec3[f32]
}

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

struct FragIn
{
	[location(0)] uv: vec2[f32],
}

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

struct VertIn
{
	[location(0)] pos: vec2[f32],
	[location(1)] uv: vec2[f32],
}

struct VertOut
{
	[location(0)] uv: vec2[f32],
	[builtin(position)] position: vec4[f32]
}

[entry(frag)]
fn main(input: FragIn) -> 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;
}

[entry(vert)]
fn main(input: VertIn) -> VertOut
{
	let output: VertOut;
	output.position = vec4[f32](input.pos, 0.0, 1.0);
	output.uv = input.uv;

	return output;
}