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pupillo

glSwapBuffers

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Who knows why glSwapBuffers takes as much as some milliSecs to run? What does it do exactly? I expected something like pointers exchange but I'm afraid it moves the content of the buffers. Am I right? Thanks

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glSwapBuffers will execute all pending commands, It might wait for vertical retrace. As for the swap itself, it's configurable but most probably something like a pointer exchange.

HTH.

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I omitted to say that my scene is totally empty, vertical sync is disabled, I'm using a direct rendering context and my code simply is:
while (1) { glXSwapBuffers(...); }
It can't be just an exchange...

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Unless you're shipping this application, don't bother. Profile when you have a real problem.
EDIT:
Quote:

I'm using a direct rendering context


As in single buffered rendering? If so why are you calling glXSwapBuffers?

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No, direct rendering means it bypasses the X server fluff and is hw accelerated.
With indirect rendering, you don't get hw accel.

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doubble buffered mode

GLint att[] = { GLX_RGBA, GLX_DEPTH_SIZE, 24, GLX_DOUBLEBUFFER, None };
...
vi = glXChooseVisual(dpy, 0, att);

I don't understend why glXSwapBuffers is so slow if hw acc. is enabled ! :S

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