GL_EXT_framebuffer_blit
http://oss.sgi.com/projects/ogl-sample/registry/EXT/framebuffer_blit.txt
	GL_DRAW_FRAMEBUFFER_BINDING_EXT 0x8CA6
	GL_READ_FRAMEBUFFER_EXT 0x8CA8
	GL_DRAW_FRAMEBUFFER_EXT 0x8CA9
	GL_READ_FRAMEBUFFER_BINDING_EXT 0x8CAA
	void glBlitFramebufferEXT (GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter)