xswapbuffers.html

来自「计算机图形学～想必是很多人需要的～在此共享一下」· HTML 代码 · 共 111 行

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<HTML><BODY><PRE>     <STRONG>NAME</STRONG>	  <STRONG>glXSwapBuffers</STRONG> - exchange front and back buffers     <STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG>	  void <STRONG>glXSwapBuffers</STRONG>( Display *<EM>dpy</EM>,			       GLXDrawable <EM>drawable</EM> )     <STRONG>PARAMETERS</STRONG>	  <EM>dpy</EM>	    Specifies the connection to	the X server.	  <EM>drawable</EM>  Specifies the drawable whose buffers are to	be		    swapped.     <STRONG>DESCRIPTION</STRONG>	  <STRONG>glXSwapBuffers</STRONG> promotes the contents of the back buffer of	  <EM>drawable</EM> to become the contents of the front buffer of	  <EM>drawable</EM>.  The contents of the back buffer then become	  undefined.  The update typically takes place during the	  vertical retrace of the monitor, rather than immediately	  after	<STRONG>glXSwapBuffers</STRONG> is called.	  <STRONG>glXSwapBuffers</STRONG> performs an implicit <STRONG>glFlush</STRONG> before it	  returns.  Subsequent OpenGL commands may be issued	  immediately after calling <STRONG>glXSwapBuffers</STRONG>, but	are not	  executed until the buffer exchange is	completed.	  If <EM>drawable</EM> was not created with respect to a	double-	  buffered visual, <STRONG>glXSwapBuffers</STRONG> has no effect, and no	error	  is generated.     <STRONG>NOTES</STRONG>	  The contents of the back buffer become undefined after a	  swap.	Note that this applies to pbuffers as well as windows.	  All GLX rendering contexts share the same notion of which	  are front buffers and	which are back buffers.	 One	  consequence is that when multiple clients are	rendering to	  the same double-buffered window, all of them should finish	  rendering before one of them issues the command to swap	  buffers.  The	clients	are responsible	for implementing this	  synchronization.  Typically this is accomplished by	  executing <STRONG>glFinish</STRONG> and then using a semaphore	in shared	  memory to rendezvous before swapping.     <STRONG>ERRORS</STRONG>	  <STRONG>GLXBadDrawable</STRONG> is generated if <EM>drawable</EM> is not a valid GLX	  drawable.	  <STRONG>GLXBadCurrentWindow</STRONG> is generated if <EM>dpy</EM> and <EM>drawable</EM> are	  respectively the display and drawable	associated with	the	  current context of the calling thread, and <EM>drawable</EM>	  identifies a window that is no longer	valid.     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>	  <STRONG>glFlush</STRONG>, <STRONG>glXBindSwapBarrierSGIX</STRONG>, <STRONG>glXJoinSwapGroupSGIX</STRONG>,	  <STRONG>glXSwapIntervalSGI</STRONG></PRE></BODY></HTML>

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