Change the internal constant color from a (per-draw) vertex attribute to a uniform. Pack most built-in uniforms into a single vec4 array and update them all with a single glUniform call.

--HG--
branch : minor

src/modules/graphics/opengl/OpenGL.h

@@ -220,7 +220,7 @@ public:
 	 * Set up necessary state (LOVE-provided shader uniforms, etc.) for drawing.
 	 * This *MUST* be called directly before OpenGL drawing functions.
 	 **/
-	void prepareDraw();
+	void prepareDraw(love::graphics::Graphics *gfx);
 
 	/**
 	 * State-tracked glBindBuffer.
@@ -262,13 +262,6 @@ public:
 	 **/
 	void setScissor(const Rect &v, bool canvasActive);
 
-	/**
-	 * Sets the constant color (vertex attribute). This may be applied
-	 * internally at draw-time. This gets gamma-corrected internally as well.
-	 **/
-	void setConstantColor(const Colorf &color);
-	const Colorf &getConstantColor() const;
-
 	/**
 	 * Sets the global point size.
 	 **/
@@ -473,9 +466,6 @@ private:
 		uint32 enabledAttribArrays;
 		uint32 instancedAttribArrays;
 
-		Colorf constantColor;
-		Colorf lastConstantColor;
-
 		Rect viewport;
 		Rect scissor;