shader adjustments

res/shaders/lib/LightEnv.slang

@@ -1,5 +1,6 @@
 import Common;
 import MaterialParameter;
+import Frustum;
 
 interface ILightEnv
 {
@@ -81,6 +82,8 @@ interface IBRDF
     float3 evaluateAmbient(float3 viewDir_WS);
     float getAlpha();
     float3 getEmissive();
+    float getRoughness();
+    float getMetallic();
     [mutating] void setNormal(float3 n);
 };
 
@@ -134,6 +137,8 @@ struct Phong : IBRDF
     {
         return emissive;
     }
+    float getRoughness() { return pow(2.0 / (shininess + 2.0), 0.25); }
+    float getMetallic() { return 0; }
     [mutating] void setNormal(float3 n) { normal = n; }
 };
 
@@ -187,6 +192,8 @@ struct BlinnPhong : IBRDF
     {
         return emissive;
     }
+    float getRoughness() { return pow(2.0 / (shininess + 2.0), 0.25); }
+    float getMetallic() { return 0; }
     [mutating] void setNormal(float3 n) { normal = n; }
 };
 
@@ -240,6 +247,8 @@ struct CelShading : IBRDF
     {
         return emissive;
     }
+    float getRoughness() { return 1.0; }
+    float getMetallic() { return 0; }
     [mutating] void setNormal(float3 n) { normal = n; }
 };
 
@@ -364,5 +373,7 @@ struct CookTorrance : IBRDF
     {
         return emissive;
     }
+    float getRoughness() { return roughness; }
+    float getMetallic() { return metallic; }
     [mutating] void setNormal(float3 n) { normal = n; }
 };