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1 files changed, 20 insertions, 0 deletions

diff --git a/pbr_utils.cginc b/pbr_utils.cginc
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+++ b/pbr_utils.cginc
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+#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