glutSwapInterval - Man Page

void glutSwapInterval(int interval);

interval

number of vertical blanking periods to wait for before swapping.

An interval of 0 requests no synchronization, buffers should be swapped immediately, even if the display device is in the middle of scanning out the previous frame. This may result in visible artifacts (tearing).

An interval of 1 is the standard v-sync setting. The swap is performed during the next vertical blanking period, after the current frame is done being scanned out to the display. Any other positive interval greater than 1, will wait for that many v-blank periods before swapping.

Negative interval values are for “adaptive v-sync”. If drawing is completed and the swap is ready to be executed before the target v-blank, the swap will be performed at the target v-blank, exactly as if the `interval` was positive. If the target interval has elapsed and the swap is running late, instead of waiting more, the swap will be performed immediately, unsynchronzied with the display.

Not all GL implementations support all of these semantics. Freeglut will attempt to fall-back to the nearest-equivalent supported swap interval. If adaptive v-sync is not supported, negative values will be flipped to their positive equivalent. If running unsynchronized is not possible, an interval of 1 will be used instead.

glutSwapBuffers

John Tsiombikas (nuclear@mutantstargoat.com)