src/rt/vga.c

/* Copyright (c) 1992 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  vga.c - driver for VGA graphics adaptor under MS-DOS
 */

#include  <stdio.h>

#include  <math.h>

#include  <graph.h>

#include  "driver.h"

#include  "color.h"

#define  GAMMA          2.2             /* exponent for color correction */


int  vga_close(), vga_clear(), vga_paintr(), vga_comout(), vga_errout(),
                vga_comin();

static struct driver  vga_driver = {
        vga_close, vga_clear, vga_paintr, NULL,
        vga_comout, vga_comin, NULL, 1.0
};

static char  fatalerr[128];

static struct videoconfig  config;

extern char  *getenv();


struct driver *
vga_init(name, id)                      /* open VGA */
char  *name, *id;
{
        static short  mode_pref[] = {_MRES256COLOR, -1};
        static short  smode_pref[] = {_XRES256COLOR, _SVRES256COLOR,
                                        _VRES256COLOR, _MRES256COLOR, -1};
        char  *ep;
        register short  *mp;

        mp = !strcmp(name, "vga") ? mode_pref : smode_pref;
        for ( ; *mp != -1; mp++)
                if (_setvideomode(*mp))
                        break;
        if (*mp == -1) {
                _setvideomode(_DEFAULTMODE);
                stderr_v(name);
                stderr_v(": card not present or insufficient VGA memory\n");
                return(NULL);
        }
        _getvideoconfig(&config);
        _settextwindow(config.numtextrows-2, 1,
                        config.numtextrows, config.numtextcols);
        vga_driver.xsiz = config.numxpixels;
        vga_driver.ysiz = (long)config.numypixels*(config.numtextrows-3)
                                /config.numtextrows;
        switch (config.mode) {                  /* correct problems */
        case _XRES256COLOR:
                vga_driver.ysiz -= 16;
                break;
        case _MRES256COLOR:
                vga_driver.pixaspect = 1.2;
                break;
        }
        _setviewport(0, 0, vga_driver.xsiz, vga_driver.ysiz);
        if ((ep = getenv("GAMMA")) != NULL)     /* make gamma map */
                make_gmap(atof(ep));
        else
                make_gmap(GAMMA);
        _remappalette(1, _BRIGHTWHITE);
        _settextcolor(1);
        ms_gcinit(&vga_driver);
        errvec = vga_errout;
        cmdvec = vga_comout;
        if (wrnvec != NULL)
                wrnvec = vga_comout;
        return(&vga_driver);
}


static
vga_close()                                     /* close VGA */
{
        ms_gcdone(&vga_driver);
        _setvideomode(_DEFAULTMODE);
        errvec = stderr_v;                      /* reset error vectors */
        cmdvec = NULL;
        if (wrnvec != NULL)
                wrnvec = stderr_v;
        if (fatalerr[0])
                stderr_v(fatalerr);             /* repeat error message */
}


static
vga_clear(x, y)                                 /* clear VGA */
int  x, y;
{
        _clearscreen(_GCLEARSCREEN);
        new_ctab(config.numcolors-2);           /* init color table */
}


static
vga_paintr(col, xmin, ymin, xmax, ymax)         /* paint a rectangle */
COLOR  col;
int  xmin, ymin, xmax, ymax;
{
        extern int  vgacolr();

        _setcolor(get_pixel(col, vgacolr)+2);
        _rectangle(_GFILLINTERIOR, xmin, vga_driver.ysiz-ymax,
                        xmax-1, vga_driver.ysiz-1-ymin);
        vga_driver.inpready = kbhit();
}


static
vga_comout(s)                           /* put s to text output */
register char  *s;
{
        struct rccoord  tpos;
        char  buf[128];
        register char  *cp;

        for (cp = buf; ; s++) {
                switch (*s) {
                case '\b':
                case '\r':
                case '\0':
                        if (cp > buf) {
                                *cp = '\0';
                                _outtext(cp = buf);
                        }
                        if (*s == '\0')
                                break;
                        tpos = _gettextposition();
                        _settextposition(tpos.row, *s=='\r' ? 1 : tpos.col-1);
                        continue;
                default:
                        *cp++ = *s;
                        continue;
                }
                return(0);
        }
        fatalerr[0] = '\0';
}


static
vga_errout(msg)
register char  *msg;
{
        static char  *fep = fatalerr;

        _outtext(msg);
        while (*msg)
                *fep++ = *msg++;
        *fep = '\0';
        if (fep > fatalerr && fep[-1] == '\n')
                fep = fatalerr;
}


static
vga_comin(buf, prompt)                  /* get input line from console */
char  *buf;
char  *prompt;
{
        extern int  getch();

        if (prompt != NULL)
                _outtext(prompt);
        editline(buf, getch, vga_comout);
        vga_driver.inpready = kbhit();
}


static
vgacolr(index, r, g, b)                /* enter a color into our table */
int  index;
int  r, g, b;
{
        register long  cl;

        cl = (long)b<<14 & 0x3f0000L;
        cl |= g<<6 & 0x3f00;
        cl |= r>>2;
        _remappalette(index+2, cl);
}
Revision:	2.6
Committed:	Fri Jun 4 14:49:08 1993 UTC (30 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.5:	+2 -0 lines
Log Message:	added math.h for atof() usage
#	User	Rev	Content
1	greg	2.1	/* Copyright (c) 1992 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* vga.c - driver for VGA graphics adaptor under MS-DOS
9			*/
10
11			#include <stdio.h>
12
13	greg	2.6	#include <math.h>
14
15	greg	2.1	#include <graph.h>
16
17			#include "driver.h"
18
19			#include "color.h"
20
21			#define GAMMA 2.2 /* exponent for color correction */
22
23
24	greg	2.2	int vga_close(), vga_clear(), vga_paintr(), vga_comout(), vga_errout(),
25			vga_comin();
26	greg	2.1
27			static struct driver vga_driver = {
28			vga_close, vga_clear, vga_paintr, NULL,
29	greg	2.2	vga_comout, vga_comin, NULL, 1.0
30	greg	2.1	};
31
32	greg	2.2	static char fatalerr[128];
33
34	greg	2.1	static struct videoconfig config;
35
36	greg	2.2	extern char *getenv();
37	greg	2.1
38	greg	2.2
39	greg	2.1	struct driver *
40			vga_init(name, id) /* open VGA */
41			char name, id;
42			{
43	greg	2.4	static short mode_pref[] = {_MRES256COLOR, -1};
44			static short smode_pref[] = {_XRES256COLOR, _SVRES256COLOR,
45	greg	2.3	_VRES256COLOR, _MRES256COLOR, -1};
46	greg	2.2	char *ep;
47	greg	2.4	register short *mp;
48	greg	2.2
49	greg	2.4	mp = !strcmp(name, "vga") ? mode_pref : smode_pref;
50			for ( ; *mp != -1; mp++)
51			if (_setvideomode(*mp))
52	greg	2.2	break;
53	greg	2.4	if (*mp == -1) {
54	greg	2.2	_setvideomode(_DEFAULTMODE);
55			stderr_v(name);
56			stderr_v(": card not present or insufficient VGA memory\n");
57	greg	2.1	return(NULL);
58	greg	2.2	}
59	greg	2.1	_getvideoconfig(&config);
60			_settextwindow(config.numtextrows-2, 1,
61			config.numtextrows, config.numtextcols);
62			vga_driver.xsiz = config.numxpixels;
63	greg	2.2	vga_driver.ysiz = (long)config.numypixels*(config.numtextrows-3)
64	greg	2.1	/config.numtextrows;
65	greg	2.2	switch (config.mode) { /* correct problems */
66			case _XRES256COLOR:
67			vga_driver.ysiz -= 16;
68			break;
69			case _MRES256COLOR:
70			vga_driver.pixaspect = 1.2;
71			break;
72			}
73	greg	2.1	_setviewport(0, 0, vga_driver.xsiz, vga_driver.ysiz);
74	greg	2.2	if ((ep = getenv("GAMMA")) != NULL) /* make gamma map */
75			make_gmap(atof(ep));
76			else
77			make_gmap(GAMMA);
78			_remappalette(1, _BRIGHTWHITE);
79	greg	2.1	_settextcolor(1);
80	greg	2.2	ms_gcinit(&vga_driver);
81			errvec = vga_errout;
82	greg	2.1	cmdvec = vga_comout;
83			if (wrnvec != NULL)
84			wrnvec = vga_comout;
85			return(&vga_driver);
86			}
87
88
89			static
90			vga_close() /* close VGA */
91			{
92	greg	2.5	ms_gcdone(&vga_driver);
93	greg	2.2	_setvideomode(_DEFAULTMODE);
94			errvec = stderr_v; /* reset error vectors */
95	greg	2.1	cmdvec = NULL;
96			if (wrnvec != NULL)
97			wrnvec = stderr_v;
98	greg	2.2	if (fatalerr[0])
99			stderr_v(fatalerr); /* repeat error message */
100	greg	2.1	}
101
102
103			static
104			vga_clear(x, y) /* clear VGA */
105			int x, y;
106			{
107			_clearscreen(_GCLEARSCREEN);
108			new_ctab(config.numcolors-2); /* init color table */
109			}
110
111
112			static
113			vga_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */
114			COLOR col;
115			int xmin, ymin, xmax, ymax;
116			{
117			extern int vgacolr();
118
119			_setcolor(get_pixel(col, vgacolr)+2);
120			_rectangle(_GFILLINTERIOR, xmin, vga_driver.ysiz-ymax,
121			xmax-1, vga_driver.ysiz-1-ymin);
122			vga_driver.inpready = kbhit();
123			}
124
125
126			static
127			vga_comout(s) /* put s to text output */
128			register char *s;
129			{
130			struct rccoord tpos;
131			char buf[128];
132			register char *cp;
133
134			for (cp = buf; ; s++) {
135			switch (*s) {
136			case '\b':
137			case '\r':
138			case '\0':
139			if (cp > buf) {
140			*cp = '\0';
141			_outtext(cp = buf);
142			}
143			if (*s == '\0')
144			break;
145			tpos = _gettextposition();
146	greg	2.2	_settextposition(tpos.row, *s=='\r' ? 1 : tpos.col-1);
147	greg	2.1	continue;
148			default:
149			cp++ = s;
150			continue;
151			}
152			return(0);
153			}
154	greg	2.2	fatalerr[0] = '\0';
155			}
156
157
158			static
159			vga_errout(msg)
160			register char *msg;
161			{
162			static char *fep = fatalerr;
163
164			_outtext(msg);
165			while (*msg)
166			fep++ = msg++;
167			*fep = '\0';
168			if (fep > fatalerr && fep[-1] == '\n')
169			fep = fatalerr;
170	greg	2.1	}
171
172
173			static
174			vga_comin(buf, prompt) /* get input line from console */
175			char *buf;
176			char *prompt;
177			{
178			extern int getch();
179
180			if (prompt != NULL)
181			_outtext(prompt);
182			editline(buf, getch, vga_comout);
183			vga_driver.inpready = kbhit();
184			}
185
186
187			static
188			vgacolr(index, r, g, b) /* enter a color into our table */
189			int index;
190			int r, g, b;
191			{
192			register long cl;
193
194			cl = (long)b<<14 & 0x3f0000L;
195			cl \|= g<<6 & 0x3f00;
196			cl \|= r>>2;
197			_remappalette(index+2, cl);
198			}