Added support for include shaders in material library

materialsLibrary/config.json

@@ -11,6 +11,9 @@
     },
     {
       "file": "materials/pbr/babylon.pbrMaterial.ts",
+      "referenceFiles": [
+        "materials/pbr/includes/helperFunctions.fx"  
+      ],
       "shaderFiles": [
         "materials/pbr/pbr.vertex.fx",
         "materials/pbr/pbr.fragment.fx",

materialsLibrary/gulpfile.js

@@ -20,6 +20,10 @@ function shadersName(filename) {
       .replace('.fx', 'Shader');
 }
 
+function includeShadersName(filename) {
+    return filename.replace('.fx', '');
+}
+
 gulp.task('copyReference', function () {
     return gulp.src("../dist/preview release/babylon.max.js").pipe(gulp.dest("test/refs"));
 });
@@ -57,7 +61,15 @@ gulp.task('default', ["copyReference"], function () {
                 .pipe(uncommentShader())
                 .pipe(srcToVariable("BABYLON.Effect.ShadersStore", true, shadersName));
 
-        return merge2(js, shader)
+        if (!material.referenceFiles) {
+            material.referenceFiles = [];
+        }
+        
+        var includeShader = gulp.src(material.referenceFiles)
+            .pipe(uncommentShader())
+            .pipe(srcToVariable("BABYLON.Effect.IncludesShadersStore", true, includeShadersName));
+        
+        return merge2(js, shader, includeShader)
             .pipe(cleants())
             .pipe(replace(extendsSearchRegex, ""))
             .pipe(concat(material.output))

materialsLibrary/materials/pbr/includes/helperFunctions.fx

@@ -0,0 +1,18 @@
+// PBR HELPER METHODS
+float Square(float value)
+{
+    return value * value;
+}
+
+float getLuminance(vec3 color)
+{
+    return clamp(dot(color, vec3(0.2126, 0.7152, 0.0722)), 0., 1.);
+}
+
+float convertRoughnessToAverageSlope(float roughness)
+{
+    // Calculate AlphaG as square of roughness; add epsilon to avoid numerical issues
+    const float kMinimumVariance = 0.0005;
+    float alphaG = Square(roughness) + kMinimumVariance;
+    return alphaG;
+}

materialsLibrary/materials/pbr/legacypbr.fragment.fx

@@ -33,25 +33,7 @@ const float kPi = 3.1415926535897932384626433832795;
 const float kRougnhessToAlphaScale = 0.1;
 const float kRougnhessToAlphaOffset = 0.29248125;
 
-
-// PBR HELPER METHODS
-float Square(float value)
-{
-    return value * value;
-}
-
-float getLuminance(vec3 color)
-{
-    return clamp(dot(color, vec3(0.2126, 0.7152, 0.0722)), 0., 1.);
-}
-
-float convertRoughnessToAverageSlope(float roughness)
-{
-    // Calculate AlphaG as square of roughness; add epsilon to avoid numerical issues
-    const float kMinimumVariance = 0.0005;
-    float alphaG = Square(roughness) + kMinimumVariance;
-    return alphaG;
-}
+#include<helperFunctions>
 
 // Based on Beckamm roughness to Blinn exponent + http://casual-effects.blogspot.ca/2011/08/plausible-environment-lighting-in-two.html 
 float getMipMapIndexFromAverageSlope(float maxMipLevel, float alpha)

materialsLibrary/materials/pbr/pbr.fragment.fx

@@ -81,25 +81,7 @@ const float kPi = 3.1415926535897932384626433832795;
 const float kRougnhessToAlphaScale = 0.1;
 const float kRougnhessToAlphaOffset = 0.29248125;
 
-
-// PBR HELPER METHODS
-float Square(float value)
-{
-    return value * value;
-}
-
-float getLuminance(vec3 color)
-{
-    return clamp(dot(color, vec3(0.2126, 0.7152, 0.0722)), 0., 1.);
-}
-
-float convertRoughnessToAverageSlope(float roughness)
-{
-    // Calculate AlphaG as square of roughness; add epsilon to avoid numerical issues
-    const float kMinimumVariance = 0.0005;
-    float alphaG = Square(roughness) + kMinimumVariance;
-    return alphaG;
-}
+#include<helperFunctions>
 
 // Based on Beckamm roughness to Blinn exponent + http://casual-effects.blogspot.ca/2011/08/plausible-environment-lighting-in-two.html 
 float getMipMapIndexFromAverageSlope(float maxMipLevel, float alpha)