Shaders: make Phong uniform location calculations more parametrized.

src/Magnum/Shaders/Phong.cpp

@@ -51,7 +51,7 @@ namespace {
     };
 }
 
-Phong::Phong(const Flags flags, const UnsignedInt lightCount): _flags{flags}, _lightCount{lightCount}, _lightColorsUniform{9 + Int(lightCount)} {
+Phong::Phong(const Flags flags, const UnsignedInt lightCount): _flags{flags}, _lightCount{lightCount}, _lightColorsUniform{_lightPositionsUniform + Int(lightCount)} {
     #ifdef MAGNUM_BUILD_STATIC
     /* Import resources on static build, if not already */
     if(!Utility::Resource::hasGroup("MagnumShaders"))
@@ -100,7 +100,7 @@ Phong::Phong(const Flags flags, const UnsignedInt lightCount): _flags{flags}, _l
         .addSource(flags & Flag::AlphaMask ? "#define ALPHA_MASK\n" : "")
         .addSource(Utility::formatString(
             "#define LIGHT_COUNT {}\n"
-            "#define LIGHT_COLORS_LOCATION {}\n", lightCount, 9 + lightCount))
+            "#define LIGHT_COLORS_LOCATION {}\n", lightCount, _lightPositionsUniform + lightCount))
         #ifndef MAGNUM_TARGET_GLES
         .addSource(std::move(lightInitializer))
         #endif