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RedHat 9 (Linux i386) - man page for glxmakecurrent (redhat section 3x)

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       glXMakeCurrent - attach a GLX context to a window or a GLX pixmap

       Bool glXMakeCurrent( Display *dpy,
			    GLXDrawable drawable,
			    GLXContext ctx )

       delim $$

       dpy	 Specifies the connection to the X server.

       drawable  Specifies a GLX drawable.  Must be either an X window ID or a GLX pixmap ID.

       ctx	 Specifies a GLX rendering context that is to be attached to drawable.

       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

       To release the current context without assigning a new one, call glXMakeCurrent with draw-
       able 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.

       A process is a single-execution environment, implemented in a single address  space,  con-
       sisting 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.

       BadMatch  is  generated	if  drawable was not created with the same X screen and visual as
       ctx.  It is also generated if drawable is None and ctx is not NULL.

       BadAccess is generated if ctx was current to another thread at the time glXMakeCurrent was

       GLXBadDrawable is generated if drawable is not a valid GLX drawable.

       GLXBadContext is generated if ctx is not a valid GLX context.

       GLXBadContextState  is  generated  if  glXMakeCurrent is executed between the execution of
       glBegin and the corresponding execution of glEnd.

       GLXBadContextState is also generated if the  rendering  context	current  to  the  calling
       thread has GL renderer state GL_FEEDBACK or GL_SELECT.

       GLXBadCurrentWindow is generated if there are pending GL commands for the previous context
       and the current drawable is a window that is no longer valid.

       BadAlloc may be generated if the server has delayed allocation of ancillary buffers  until
       glXMakeCurrent  is called, only to find that it has insufficient resources to complete the

       glXCreateContext, glXCreateGLXPixmap

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