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- /**
- ** P8.H
- **
- ** Copyright (C) 1992, Csaba Biegl
- ** 820 Stirrup Dr, Nashville, TN, 37221
- ** csaba@vuse.vanderbilt.edu
- **
- ** This file is distributed under the terms listed in the document
- ** "copying.cb", available from the author at the address above.
- ** A copy of "copying.cb" should accompany this file; if not, a copy
- ** should be available from where this file was obtained. This file
- ** may not be distributed without a verbatim copy of "copying.cb".
- ** You should also have received a copy of the GNU General Public
- ** License along with this program (it is in the file "copying");
- ** if not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- ** Cambridge, MA 02139, USA.
- **
- ** 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.
- **/
-
- #ifdef __TURBOC__
- #pragma inline
- #endif
-
- #include "grx.h"
- #include "libgrx.h"
- #include "vgaregs.h"
-
- typedef unsigned char far *pixptr; /* pixel pointer */
- #define C_SIGNIF 0xff /* significant bits in a color */
- extern int _GrP8DrawTable[]; /* drawing control table */
-
- #ifdef _INLINE256
- # define P_ADDRESS(cxt,off) ((pixptr)(off))
- # define P_XADDRESS(cxt,off) ((pixptr)((cxt)->gc_baseaddr +
- (((long)(off) - (long)((cxt)->gc_baseaddr)) >> 2)
- ))
- #else
- # define P_ADDRESS(cxt,off) ((pixptr)((cxt)->gc_baseaddr + \
- (unsigned)(COORD_Y(off) * (cxt)->gc_lineoffset) + \
- (unsigned)(COORD_X(off)) \
- ))
- # define P_XADDRESS(cxt,off) ((pixptr)((cxt)->gc_baseaddr + \
- ((unsigned)(COORD_Y(off) * (cxt)->gc_lineoffset) >> 2) + \
- ((unsigned)(COORD_X(off)) >> 2) \
- ))
- #endif /* _INLINE256 */
-
- extern int _GrP8Chain4Off; /* turns off plane mode */
- extern int _GrP8Chain4On; /* turns on plane mode */
- extern char _GrP8UsePlanarMode; /* set with well-behaved cards */
- extern char _GrP8PlanarModeOn; /* plane mode status flag */
- extern int _GrP8RmaskTable[]; /* right plane masks */
- extern int _GrP8LmaskTable[]; /* left plane masks */
-
- #define PLANAR_MODE_ON() do { \
- if(!_GrP8PlanarModeOn) { \
- __SET_VGA_REG__(VGA_SEQUENCER_PORT,_GrP8Chain4Off,0); \
- _GrP8PlanarModeOn = TRUE; \
- } \
- } while(0)
-
- #define PLANAR_MODE_OFF() do { \
- if(_GrP8PlanarModeOn) { \
- __SET_VGA_REG__(VGA_SEQUENCER_PORT,_GrP8Chain4On,0); \
- _SetVGAPlaneMask(0xff); \
- _GrP8PlanarModeOn = FALSE; \
- } \
- } while(0)
-
-