GD.c
// Wait for the VBLANK to go from 0 to 1: this is the start
// of the vertical blanking interval.
Wait for the VBLANK to go from 0 to 1: this is the start
of the vertical blanking interval.
Wait for the VBLANK to go from 0 to 1 : this is the start of the vertical blanking interval .
void vis_gd_waitvblank()
{
  while (vis_gd_rd(VBLANK) == 1)
    ;
  while (vis_gd_rd(VBLANK) == 0)
    ;
}
void vis_gd_waitvblank ( ) { while ( vis_gd_rd ( VBLANK ) == 1 ) ; while ( vis_gd_rd ( VBLANK ) == 0 ) ; }
Wait for the VBLANK to go from 0 to 1: this is the start
of the vertical blanking interval.
Wait for the VBLANK to go from 0 to 1 : this is the start of the vertical blanking interval .