Prevent redundant calls to glEnable/DisableVertexAttribArray. This should hopefully fix a performance regression compared to 0.9.2 as well.

src/modules/graphics/opengl/OpenGL.h

@@ -23,6 +23,7 @@
 
 // LOVE
 #include "common/config.h"
+#include "common/int.h"
 #include "graphics/Color.h"
 #include "graphics/Texture.h"
 #include "common/Matrix.h"
@@ -60,6 +61,14 @@ enum VertexAttribID
 	ATTRIB_MAX_ENUM
 };
 
+enum VertexAttribFlags
+{
+	ATTRIBFLAG_POS = 1 << ATTRIB_POS,
+	ATTRIBFLAG_TEXCOORD = 1 << ATTRIB_TEXCOORD,
+	ATTRIBFLAG_COLOR = 1 << ATTRIB_COLOR,
+	ATTRIBFLAG_CONSTANTCOLOR = 1 << ATTRIB_CONSTANTCOLOR
+};
+
 /**
  * Thin layer between OpenGL and the rest of the program.
  * Internally shadows some OpenGL context state for improved efficiency and
@@ -197,6 +206,15 @@ public:
 	void drawArrays(GLenum mode, GLint first, GLsizei count);
 	void drawElements(GLenum mode, GLsizei count, GLenum type, const void *indices);
 
+	/**
+	 * Sets the enabled vertex attribute arrays based on the specified attribute
+	 * bits. Each bit in the uint32 represents an enabled attribute array index.
+	 * For example, useVertexAttribArrays(1 << 0) will enable attribute index 0.
+	 * See the VertexAttribFlags enum for the standard vertex attributes.
+	 * This function *must* be used instead of glEnable/DisableVertexAttribArray.
+	 **/
+	void useVertexAttribArrays(uint32 arraybits);
+
 	/**
 	 * Sets the OpenGL rendering viewport to the specified rectangle.
 	 * The y-coordinate starts at the top.
@@ -353,6 +371,8 @@ private:
 		// Currently active texture unit.
 		int curTextureUnit;
 
+		uint32 enabledAttribArrays;
+
 		Viewport viewport;
 		Viewport scissor;