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       glXCreateGLXPixmap - create an off-screen GLX rendering area

       GLXPixmap glXCreateGLXPixmap( Display *dpy,
				     XVisualInfo *vis,
				     Pixmap pixmap )

       delim $$

       dpy     Specifies the connection to the X server.

       vis     Specifies  the  visual  that defines the structure of the rendering area.  It is a
	       pointer to an XVisualInfo structure, not a visual ID or a pointer to a Visual.

       pixmap  Specifies the X pixmap that will be used as the front left  color  buffer  of  the
	       off-screen rendering area.

       glXCreateGLXPixmap creates an off-screen rendering area and returns its XID.  Any GLX ren-
       dering context that was created with respect to vis can be used to render into  this  off-
       screen area.  Use glXMakeCurrent to associate the rendering area with a GLX rendering con-

       The X pixmap identified by pixmap is used as the front left buffer of the  resulting  off-
       screen  rendering area.	All other buffers specified by vis, including color buffers other
       than the front left buffer, are created without externally  visible  names.   GLX  pixmaps
       with double-buffering are supported.  However, glXSwapBuffers is ignored by these pixmaps.

       Some implementations may not support GLX pixmaps with direct rendering contexts.

       XVisualInfo  is	defined  in  Xutil.h.	It is a structure that includes visual, visualID,
       screen, and depth elements.

       BadMatch is generated if the depth of pixmap does not match the depth  value  reported  by
       core X11 for vis, or if pixmap was not created with respect to the same screen as vis.

       BadValue is generated if vis is not a valid XVisualInfo pointer (for example, if a partic-
       ular GLX implementation does not support this visual).

       BadPixmap is generated if pixmap is not a valid pixmap.

       BadAlloc is generated if the server cannot allocate the GLX pixmap.

       glXCreateContext, glXIsDirect, glXMakeCurrent

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