uncharted2.glsl

vec3 uncharted2Tonemap(vec3 x) {
  float A = 0.15;
  float B = 0.50;
  float C = 0.10;
  float D = 0.20;
  float E = 0.02;
  float F = 0.30;
  float W = 11.2;
  return ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F;
}

vec3 uncharted2(vec3 color) {
  const float W = 11.2;
  float exposureBias = 2.0;
  vec3 curr = uncharted2Tonemap(exposureBias * color);
  vec3 whiteScale = 1.0 / uncharted2Tonemap(vec3(W));
  return curr * whiteScale;
}

float uncharted2Tonemap(float x) {
  float A = 0.15;
  float B = 0.50;
  float C = 0.10;
  float D = 0.20;
  float E = 0.02;
  float F = 0.30;
  float W = 11.2;
  return ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F;
}

float uncharted2(float color) {
  const float W = 11.2;
  const float exposureBias = 2.0;
  float curr = uncharted2Tonemap(exposureBias * color);
  float whiteScale = 1.0 / uncharted2Tonemap(W);
  return curr * whiteScale;
}

#pragma glslify: export(uncharted2)