Implement automatic batching for points, lines, shapes, and images/quads.

The above are batched together into a single draw call when called without other drawing calls in between, as long as the following criteria are met:

- The texture is the same.
- The primitive type is the same (points cannot be batched with non-points).
- The love.graphics state is the same (aside from the current color - i.e. setColor - and the transform state).
- The active shader’s uniform values are the same.

You can examine the ‘drawcalls’ field of love.graphics.getStats() to help determine if your code is allowing for optimum batching.

--HG--
branch : minor

src/modules/graphics/opengl/OpenGL.h

@@ -27,6 +27,7 @@
 #include "common/math.h"
 #include "graphics/Color.h"
 #include "graphics/Texture.h"
+#include "graphics/vertex.h"
 #include "common/Matrix.h"
 
 // GLAD
@@ -70,13 +71,6 @@ enum VertexAttribFlags
 	ATTRIBFLAG_CONSTANTCOLOR = 1 << ATTRIB_CONSTANTCOLOR
 };
 
-enum BufferType
-{
-	BUFFER_VERTEX = 0,
-	BUFFER_INDEX,
-	BUFFER_MAX_ENUM
-};
-
 /**
  * Thin layer between OpenGL and the rest of the program.
  * Internally shadows some OpenGL context state for improved efficiency and
@@ -119,36 +113,6 @@ public:
 		GLenum type = 0;
 	};
 
-	struct
-	{
-		std::vector<Matrix4> transform;
-		Matrix4 projection;
-	} matrices;
-
-	class TempTransform
-	{
-	public:
-
-		TempTransform(OpenGL &gl)
-			: gl(gl)
-		{
-			gl.pushTransform();
-		}
-
-		~TempTransform()
-		{
-			gl.popTransform();
-		}
-
-		Matrix4 &get()
-		{
-			return gl.getTransform();
-		}
-
-	private:
-		OpenGL &gl;
-	};
-
 	class TempDebugGroup
 	{
 	public:
@@ -242,10 +206,6 @@ public:
 	 **/
 	void deInitContext();
 
-	void pushTransform();
-	void popTransform();
-	Matrix4 &getTransform();
-
 	/**
 	 * Set up necessary state (LOVE-provided shader uniforms, etc.) for drawing.
 	 * This *MUST* be called directly before OpenGL drawing functions.
@@ -359,6 +319,7 @@ public:
 	 * @param restoreprev Restore previously bound texture unit when done.
 	 **/
 	void bindTextureToUnit(GLuint texture, int textureunit, bool restoreprev);
+	void bindTextureToUnit(Texture *texture, int textureunit, bool restoreprev);
 
 	/**
 	 * Helper for deleting an OpenGL texture.
@@ -440,7 +401,6 @@ private:
 	void initVendor();
 	void initOpenGLFunctions();
 	void initMaxValues();
-	void initMatrices();
 	void createDefaultTexture();
 
 	bool contextInitialized;