feat(tonemap): add aces fitted sdr

src/shaders/tonemap.hlsl

@@ -25,6 +25,10 @@ float SmoothClamp(float x) {
   return (abs(1.0 - x) < u) ? q : saturate(x);
 }
 
+float3 Reinhard(float x) {
+  return x / (1.0f + x);
+}
+
 float3 Reinhard(float3 color) {
   return color / (1.0f + color);
 }
@@ -34,6 +38,17 @@ float3 ReinhardExtended(float3 color, float max_white = 1000.f / 203.f) {
          / (1.0f + color);
 }
 
+// Narkowicz
+float3 ACESFittedSDR(float3 color) {
+  color *= 0.6f;
+  const float a = 2.51f;
+  const float b = 0.03f;
+  const float c = 2.43f;
+  const float d = 0.59f;
+  const float e = 0.14f;
+  return clamp((color * (a * color + b)) / (color * (c * color + d) + e), 0.0f, 1.0f);
+}
+
 // https://www.slideshare.net/ozlael/hable-john-uncharted2-hdr-lighting
 // http://filmicworlds.com/blog/filmic-tonemapping-operators/