gpr_wait_frame() — Apollo Domain/OS SR10.3.5

GPR_$WAIT_FRAME                   GPR Calls                    GPR_$WAIT_FRAME


NAME
     gpr_$wait_frame - waits for the current frame refresh cycle to end before
     executing operations that modify the display.

FORMAT
     gpr_$wait_frame (status)

DESCRIPTION
     This routine waits for the current frame refresh cycle to end before exe-
     cuting operations that modify the display.

   Output Parameters
     status
          Completion status, in status_$t format.

NOTES
     Operations that modify the color display include block transfers and
     drawing and text operations.

     This routine is useful primarily for animation.  It delays execution of
     display modifications until the scan beam has completely covered the
     screen.

     A program can also use this routine to synchronize changes to the color
     map with the beginning of the frame.
Museum
