diff --git a/src/bin/minitracer/present.wgsl b/src/bin/minitracer/present.wgsl
index 58bbd48..eb2c411 100644
--- a/src/bin/minitracer/present.wgsl
+++ b/src/bin/minitracer/present.wgsl
@@ -19,9 +19,13 @@ fn on_vertex(in: Vertex) -> Varying {
 
 @fragment
 fn on_fragment(in: Varying) -> @location(0) vec4f {
-	let hdr = textureSample(tex, smp, in.tex).xyz;
+	let pixel = textureSample(tex, smp, in.tex);
+	return vec4(rational_tone_map(pixel.xyz), 1.0);
+}
+
+fn rational_tone_map(hdr: vec3<f32>) -> vec3<f32> {
 	let luminosity = dot(hdr, vec3(0.2126, 0.7152, 0.0722));
 	let color = hdr / luminosity;
 	let luma = luminosity / (luminosity + 1.0);
-	return vec4(luma * color, 1.0);
+	return luma * color;
 }