Implemented rim_light and rim_power shader parameters, enabling outlining of objects on a per-model basis.

Will need to later refactor to allow for a more scalable means of adding per-model shader attributes.

--HG--
branch : nfb

KREngine/kraken_standard_assets_ios/Shaders/ObjectShader.vsh

@@ -138,11 +138,14 @@ uniform highp mat4      mvp_matrix; // mvp_matrix is the result of multiplying t
         varying mediump float   specularFactor;
     #endif
 
+    #if ENABLE_RIM_COLOR == 1
+        #define NEED_EYEVEC
+    #endif
 
     #if HAS_REFLECTION_CUBE_MAP == 1
         #if HAS_NORMAL_MAP == 1
+            #define NEED_EYEVEC
             uniform highp mat4 model_inverse_transpose_matrix;
-            varying mediump vec3 eyeVec;
             varying highp mat3 tangent_to_world_matrix;
         #else
             uniform highp mat4 model_matrix;
@@ -150,6 +153,10 @@ uniform highp mat4      mvp_matrix; // mvp_matrix is the result of multiplying t
         #endif
     #endif
 
+    #ifdef NEED_EYEVEC
+        varying mediump vec3 eyeVec;
+    #endif
+
     #if HAS_DIFFUSE_MAP_SCALE == 1
         uniform highp vec2  diffuseTexture_Scale;
     #endif
@@ -246,7 +253,7 @@ void main()
 
         #if HAS_REFLECTION_CUBE_MAP == 1
             #if HAS_NORMAL_MAP == 1
-                eyeVec = normalize(camera_position_model_space - vertex_position_skinned);
+    
             #else
                 // Calculate reflection vector as I - 2.0 * dot(N, I) * N
                 mediump vec3 eyeVec = normalize(camera_position_model_space - vertex_position_skinned);
@@ -255,6 +262,9 @@ void main()
             #endif
         #endif
     
+        #ifdef NEED_EYEVEC
+            eyeVec = normalize(camera_position_model_space - vertex_position_skinned);
+        #endif
     
         #if HAS_LIGHT_MAP == 1
             // Pass shadow UV co-ordinates