Prevent redundant shader uniform uploads for built-in uniforms when OpenGL ES 2 is used.

As a result, the graphics primitive drawing functions (e.g. love.graphics.rectangle) are now more efficient on mobile devices.

src/modules/graphics/opengl/Shader.h

@@ -180,11 +180,10 @@ public:
 	 * Internal use only.
 	 **/
 	bool hasVertexAttrib(VertexAttribID attrib) const;
-	bool hasBuiltinUniform(BuiltinUniform builtin) const;
-	bool sendBuiltinMatrix(BuiltinUniform builtin, int size, const GLfloat *m, int count);
-	bool sendBuiltinFloat(BuiltinUniform builtin, int size, const GLfloat *m, int count);
+
 	void checkSetScreenParams();
 	void checkSetPointSize(float size);
+	void checkSetBuiltinUniforms();
 
 	const std::map<std::string, Object *> &getBoundRetainables() const;
 
@@ -260,6 +259,9 @@ private:
 
 	float lastPointSize;
 
+	Matrix lastTransformMatrix;
+	Matrix lastProjectionMatrix;
+
 	// Counts total number of textures bound to each texture unit in all shaders
 	static std::vector<int> textureCounters;