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p8.h
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1993-12-06
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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)