WGL_NV_render_texture_rectangle
http://www.opengl.org/registry/specs/NV/render_texture_rectangle.txt
	WGL_BIND_TO_TEXTURE_RECTANGLE_RGB_NV 0x20A0
	WGL_BIND_TO_TEXTURE_RECTANGLE_RGBA_NV 0x20A1
	WGL_TEXTURE_RECTANGLE_NV 0x20A2
