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- /* SVGATextMode -- An SVGA textmode manipulation/enhancement tool
- *
- * Copyright (C) 1995,1996 Koen Gadeyne
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- /***
- *** wait_vsync.h: non-blocking V-sync wait routine (doesn't hang when no VSYNC)
- ***/
-
- #ifndef _WAIT_VSYNC_H
- #define _WAIT_VSYNC_H
-
- #define USE_VSYNC
-
- #ifdef USE_VSYNC
- # define waitframe \
- while ( !(inb(STATUS1) & 0x08) && !vtimeout ); /* wait during active display */ \
- while ( (inb(STATUS1) & 0x08) && !vtimeout ) /* now wait during vert retrace */
-
- # define wait_vblk \
- while ( (inb(STATUS1) & 0x08) && !vtimeout ); /* wait during vert retrace */ \
- while ( !(inb(STATUS1) & 0x08) && !vtimeout ) /* wait during active display */
- #else /* doesn't work. dunno why */
- # define waitframe \
- while ( (inb(STATUS0)) && !vtimeout ); /* wait during active display */ \
- while ( !(inb(STATUS0)) && !vtimeout ) /* now wait during vert retrace */
-
- # define wait_vblk \
- while ( !(inb(STATUS0)) && !vtimeout ); /* wait during vert retrace */ \
- while ( (inb(STATUS0)) && !vtimeout ) /* wait during active display */
- #endif
-
- extern bool vtimeout;
- int safe_wait_vsync();
-
- #endif
-
-
-