1 files changed, 20 insertions, 0 deletions
diff --git a/pbr_utils.cginc b/pbr_utils.cginc
new file mode 100644
index 0000000..c8c10cc
--- /dev/null
+++ b/pbr_utils.cginc
@@ -0,0 +1,20 @@
+#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