CCEffects - Fix stacking of refraction, reflection, and glass

These were all directly reading cc_MainTexture and combining it with cc_FragColor within their
function bodies instead of putting this into their input snippets.  In simpler terms this means that
input values from previous effects were not being used.

Author: Thayer J Andrews

cocos2d/CCEffectGlass.m

@@ -76,7 +76,7 @@ -(void)buildFragmentFunctions
 {
     self.fragmentFunctions = [[NSMutableArray alloc] init];
 
-    CCEffectFunctionInput *input = [[CCEffectFunctionInput alloc] initWithType:@"vec4" name:@"inputValue" snippet:@"texture2D(cc_PreviousPassTexture, cc_FragTexCoord1)"];
+    CCEffectFunctionInput *input = [[CCEffectFunctionInput alloc] initWithType:@"vec4" name:@"inputValue" snippet:@"cc_FragColor * texture2D(cc_PreviousPassTexture, cc_FragTexCoord1)"];
 
     NSString* effectBody = CC_GLSL(
                                    // Index the normal map and expand the color value from [0..1] to [-1..1]
@@ -128,7 +128,7 @@ -(void)buildFragmentFunctions
 
 
                                    // Compute the combination of the sprite's color and texture.
-                                   vec4 primaryColor = cc_FragColor * texture2D(cc_MainTexture, cc_FragTexCoord1);
+                                   vec4 primaryColor = inputValue;
 
                                    // If the refracted texture coordinates are within the bounds of the environment map
                                    // blend the primary color with the refracted environment. Multiplying by the normal

cocos2d/CCEffectReflection.m

@@ -64,7 +64,7 @@ -(void)buildFragmentFunctions
 {
     self.fragmentFunctions = [[NSMutableArray alloc] init];
 
-    CCEffectFunctionInput *input = [[CCEffectFunctionInput alloc] initWithType:@"vec4" name:@"inputValue" snippet:@"texture2D(cc_PreviousPassTexture, cc_FragTexCoord1)"];
+    CCEffectFunctionInput *input = [[CCEffectFunctionInput alloc] initWithType:@"vec4" name:@"inputValue" snippet:@"cc_FragColor * texture2D(cc_PreviousPassTexture, cc_FragTexCoord1)"];
 
     NSString* effectBody = CC_GLSL(
                                    // Compute environment space texture coordinates from the screen space
@@ -92,7 +92,7 @@ -(void)buildFragmentFunctions
                                    reflectTexCoords.y = (1.0 - cos(reflectTexCoords.y * M_PI)) * 0.5;
 
                                    // Compute the combination of the sprite's color and texture.
-                                   vec4 primaryColor = cc_FragColor * texture2D(cc_MainTexture, cc_FragTexCoord1);
+                                   vec4 primaryColor = inputValue;
 
                                    float fresnel = max(u_fresnelBias + (1.0 - u_fresnelBias) * pow((1.0 - nDotV), u_fresnelPower), 0.0);;
 

cocos2d/CCEffectRefraction.m

@@ -63,7 +63,7 @@ -(void)buildFragmentFunctions
 {
     self.fragmentFunctions = [[NSMutableArray alloc] init];
 
-    CCEffectFunctionInput *input = [[CCEffectFunctionInput alloc] initWithType:@"vec4" name:@"inputValue" snippet:@"texture2D(cc_PreviousPassTexture, cc_FragTexCoord1)"];
+    CCEffectFunctionInput *input = [[CCEffectFunctionInput alloc] initWithType:@"vec4" name:@"inputValue" snippet:@"cc_FragColor * texture2D(cc_PreviousPassTexture, cc_FragTexCoord1)"];
 
     NSString* effectBody = CC_GLSL(
                                    // Compute environment space texture coordinates from the screen space
@@ -89,7 +89,7 @@ -(void)buildFragmentFunctions
                                    float inBounds = step(0.0, min(compare.x, compare.y));
 
                                    // Compute the combination of the sprite's color and texture.
-                                   vec4 primaryColor = cc_FragColor * texture2D(cc_MainTexture, cc_FragTexCoord1);
+                                   vec4 primaryColor = inputValue;
 
                                    // If the refracted texture coordinates are within the bounds of the environment map
                                    // blend the primary color with the refracted environment. Multiplying by the normal