Add cloth lobe & IBL DFG LUTs

- add monte carlo integrator to produce the luts
- fix layer energy integration; should be multiplicative, not additive

1 files changed, 9 insertions, 1 deletions

diff --git a/pbr.cginc b/pbr.cginc
index 746de9c..806a52f 100644
--- a/pbr.cginc
+++ b/pbr.cginc
@@ -17,10 +17,14 @@ struct Pbr {
   float cc_roughness;
   float cc_strength;
 #endif
+#if defined(_CLOTH_SHEEN)
+  float cl_strength;
+  float3 cl_color;
+#endif
 };
 
 #define MIN_PERCEPTUAL_ROUGHNESS 5e-2f
-#define MIN_ROUGHNESS 2e-3f
+#define MIN_ROUGHNESS 5e-3f
 
 // TODO consider normal filtering like filamented
 void propagateSmoothness(inout Pbr pbr) {
@@ -67,6 +71,10 @@ Pbr getPbr(v2f i) {
   pbr.cc_roughness = _Clearcoat_Roughness;
   pbr.cc_strength = _Clearcoat_Strength;
 #endif
+#if defined(_CLOTH_SHEEN)
+  pbr.cl_strength = _Cloth_Sheen_Strength;
+  pbr.cl_color = _Cloth_Sheen_Color;
+#endif
   propagateSmoothness(pbr);
 
   return pbr;