home *** CD-ROM | disk | FTP | other *** search
- /* This is file GRAPHICS.C */
- /*
- ** Copyright (C) 1993 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954
- **
- ** This file is distributed under the terms listed in the document
- ** "copying.dj", available from DJ Delorie at the address above.
- ** A copy of "copying.dj" 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.dj".
- **
- ** This file is distributed WITHOUT ANY WARRANTY; without even the implied
- ** warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #include "sys/registers.h"
-
- unsigned _GrMaxX;
- unsigned _GrMaxY;
- unsigned _GrSizeX;
- unsigned _GrSizeY;
-
- GrPlot(x, y, c)
- {
- register unsigned char *a;
- if ((x<0) || (x>_GrMaxX) || (y<0) || (y>_GrMaxY))
- return;
- a = (unsigned char *)(0xd0000000+((x+y*_GrSizeX)&0xfffff));
- if (c & 0x100)
- *a ^= c;
- else
- *a = c;
- }
-
- GrPixel(x, y)
- {
- if ((x<0) || (x>_GrMaxX) || (y<0) || (y>_GrMaxY))
- return 0;
- return *(unsigned char *)(0xd0000000+((x+y*_GrSizeX)&0xfffff));
- }
-
- GrPlot3d(x, y, c)
- {
- register unsigned char *a;
- if ((x<0) || (x>_GrMaxX) || (y<0) || (y>_GrMaxY))
- return;
- a = (unsigned char *)(0xd0000000+((x+y*_GrSizeX)&0xfffff));
- if ((*a < c) || (c<0xc0))
- *a = c;
- }
-
- GrMaxX()
- {
- return _GrMaxX;
- }
-
- GrMaxY()
- {
- return _GrMaxY;
- }
-
- GrSizeX()
- {
- return _GrSizeX;
- }
-
- GrSizeY()
- {
- return _GrSizeY;
- }
-