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GLXMAKECURRENT(3G)			  OpenGL Manual 		       GLXMAKECURRENT(3G)

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

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

PARAMETERS
       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.

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
       (for reading and writing). 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 to 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.

ERRORS
       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
       called.

       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 GLX_FEEDBACK or GLX_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
       allocation.

SEE ALSO
       glXCreateContext(), glXCreateGLXPixmap()glXGetCurrentContext(), glXGetCurrentDisplay(),
       glXGetCurrentDrawable(), glXGetCurrentReadDrawable(), glXMakeContextCurrent()

COPYRIGHT
       Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI
       Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org				    06/10/2014			       GLXMAKECURRENT(3G)
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