#ifndef __PBR_UTILS_INC
#define __PBR_UTILS_INC

float perceptualRoughnessToRoughness(float perceptualRoughness) {
    return perceptualRoughness * perceptualRoughness;
}

float roughnessToPerceptualRoughness(float roughness) {
    return sqrt(roughness);
}

float smoothnessToPerceptualRoughness(float smoothness) {
  return 1.0f - smoothness;
}

float smoothnessToRoughness(float smoothness) {
  return perceptualRoughnessToRoughness(smoothnessToPerceptualRoughness(smoothness));
}

#endif  // __PBR_UTILS_INC