1 files changed, 34 insertions, 0 deletions
diff --git a/pbr.cginc b/pbr.cginc
new file mode 100644
index 0000000..6e37942
--- /dev/null
+++ b/pbr.cginc
@@ -0,0 +1,34 @@
+#ifndef __PBR_INC
+#define __PBR_INC
+
+#include "filamented.cginc"
+#include "globals.cginc"
+#include "interpolators.cginc"
+
+struct Pbr {
+  float4 albedo;
+  float3 normal;
+  float smoothness;
+  float roughness_perceptual;
+  float roughness;
+  float metallic;
+};
+
+// TODO consider normal filtering like filamented
+void propagateSmoothness(inout Pbr pbr) {
+  pbr.roughness_perceptual = max(MIN_PERCEPTUAL_ROUGHNESS, 1.0f - pbr.smoothness);
+  pbr.roughness = max(MIN_ROUGHNESS, pbr.roughness_perceptual * pbr.roughness_perceptual);
+}
+
+Pbr getPbr(v2f i) {
+  Pbr pbr = (Pbr) 0;
+  pbr.normal = float3(0, 1, 0);
+  pbr.albedo = _Color;
+  pbr.smoothness = _Smoothness;
+  propagateSmoothness(pbr);
+
+  pbr.metallic = _Metallic;
+  return pbr;
+}
+
+#endif  // __PBR_INC