HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 272

M glXMakeCurrent glXMakeCurrent glXMakeCurrent: attach a GLX context to a window or a GLX pixmap. C Specification Bool glXMakeCurrent( Display *dpy, GLXDrawable drawable, GLXContext ctx) Parameters dpy drawable ctx Specifies the connection to the X server. Specifies a GLX drawable. Must be either an X window ID or a GLX pixmap ID. Specifies a GLX rendering context that is to be attached to drawable. Description glXMakeCurrent does two things: It makes ctx the current GLX rendering context of the calling thread, replacing the previously current context if there was one, and it attaches ctx to a GLX drawable, either a window or a GLX pixmap. As a result of these two actions, subsequent GL rendering calls use rendering context ctx to modify GLX drawable drawable. Because glXMakeCurrent always replaces the current rendering context with ctx, there can be only one current context per thread. Pending commands to the previous context, if any, are flushed before it is released. The first time ctx is made current to any thread, its viewport is set to the full size of drawable. Subsequent calls by any thread to glXMakeCurrent with ctx have no effect on its viewport. To release the current context without assigning a new one, call glXMakeCurrent with drawable set None and ctx set to NULL glXMakeCurrent returns True if it is successful, False otherwise. If False is returned, the previously current rendering context and drawable (if any) remain unchanged. Notes A process is a single-execution environment, implemented in a single address space, consisting of one or more threads. A thread is one of a set of subprocesses that share a single address space, but maintain separate program counters, stack spaces, and other related global data. A thread that is the only member of its subprocess group is equivalent to a process. 272 Chapter 11