glBindFramebuffer

glBindFramebuffer: man3/glBindFramebuffer.xml

glBindFramebuffer binds the framebuffer object with name framebuffer to the framebuffer target specified by target. target must be either GL_DRAW_FRAMEBUFFER, GL_READ_FRAMEBUFFER or GL_FRAMEBUFFER. If a framebuffer object is bound to GL_DRAW_FRAMEBUFFER or GL_READ_FRAMEBUFFER, it becomes the target for rendering or readback operations, respectively, until it is deleted or another framebuffer is bound to the corresponding bind point. Calling glBindFramebuffer with target set to GL_FRAMEBUFFER binds framebuffer to both the read and draw framebuffer targets. framebuffer is the name of a framebuffer object previously returned from a call to glGenFramebuffers, or zero to break the existing binding of a framebuffer object to target.