HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 408

S glXSwapBuffers glXSwapBuffers glXSwapBuffers: make back buffer visible. C Specification void glXSwapBuffers( Display *dpy, GLXDrawable drawable) Parameters dpy drawable Specifies the connection to the X server. Specifies the window whose buffers are to be swapped. Description glXSwapBuffers promotes the contents of the back buffer of drawable to become the contents of the front buffer of drawable. 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 glXSwapBuffers is called. All GLX rendering contexts share the same notion of which are front buffers and which are back buffers. glXSwapBuffers performs an implicit glFlush before it returns. Subsequent GL commands can be issued immediately after calling glXSwapBuffers, but are not executed until the buffer exchange is completed. If drawable was not created with respect to a double-buffered visual, glXSwapBuffers has no effect, and no error is generated. Notes Synchronization of multiple GLX contexts rendering to the same double-buffered window is the responsibility of the clients. Use the X Synchronization Extension to facilitate such cooperation. The X double buffer extension (DBE) has information on which buffer is the currently displayed buffer. This information is shared with GLX. Errors • GLXBadDrawable is generated if drawable is not a valid GLX drawable. • GLXBadCurrentWindow is generated if dpy and drawable are respectively the display and drawable associated with the current context of the calling thread, and drawable identifies a window that is no longer valid. See Also glFlush 408 Chapter 17