bind
Makes an OpenGL framebuffer object active. The active framebuffer becomes the target of all OpenGL commands that render to the framebuffer or read from the framebuffer. This has no effect if the specified framebuffer object is already active. The default is framebuffer 0, indicating that the default framebuffer provided by the windowing system is active.
Parameters
framebuffer
the name of the OpenGL framebuffer object to make active, or 0 to make the default framebuffer provided by the windowing system active