xref: /freebsd/sys/dev/syscons/snake/snake_saver.c (revision 7f3dea244c40159a41ab22da77a434d7c5b5e85a)
1 /*-
2  * Copyright (c) 1995-1998 S�ren Schmidt
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer,
10  *    without modification, immediately at the beginning of the file.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 3. The name of the author may not be used to endorse or promote products
15  *    derived from this software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  *
28  *	$Id: snake_saver.c,v 1.23 1999/02/05 12:40:15 des Exp $
29  */
30 
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/module.h>
34 #include <sys/malloc.h>
35 #include <sys/kernel.h>
36 #include <sys/sysctl.h>
37 #include <sys/consio.h>
38 #include <sys/fbio.h>
39 
40 #include <machine/pc/display.h>
41 
42 #include <dev/fb/fbreg.h>
43 #include <dev/fb/splashreg.h>
44 #include <dev/syscons/syscons.h>
45 
46 static char	*message;
47 static int	*messagep;
48 static int	messagelen;
49 static int	blanked;
50 
51 static int
52 snake_saver(video_adapter_t *adp, int blank)
53 {
54 	static int	dirx, diry;
55 	int		f;
56 	sc_softc_t	*sc;
57 	scr_stat	*scp;
58 
59 /* XXX hack for minimal changes. */
60 #define	save	message
61 #define	savs	messagep
62 
63 	sc = sc_find_softc(adp, NULL);
64 	if (sc == NULL)
65 		return EAGAIN;
66 	scp = sc->cur_scp;
67 
68 	if (blank) {
69 		if (adp->va_info.vi_flags & V_INFO_GRAPHICS)
70 			return EAGAIN;
71 		if (blanked <= 0) {
72 #ifdef PC98
73 			if (epson_machine_id == 0x20) {
74 				outb(0x43f, 0x42);
75 				outb(0x0c17, inb(0xc17) & ~0x08);
76 				outb(0x43f, 0x40);
77 			}
78 #endif /* PC98 */
79 			sc_vtb_clear(&scp->scr, sc->scr_map[0x20],
80 				     (FG_LIGHTGREY | BG_BLACK) << 8);
81 			(*vidsw[adp->va_index]->set_hw_cursor)(adp, -1, -1);
82 			set_border(scp, 0);
83 			dirx = (scp->xpos ? 1 : -1);
84 			diry = (scp->ypos ?
85 				scp->xsize : -scp->xsize);
86 			for (f=0; f< messagelen; f++)
87 				savs[f] = scp->xpos + scp->ypos*scp->xsize;
88 			sc_vtb_putc(&scp->scr, savs[0], sc->scr_map[*save],
89 				    (FG_LIGHTGREY | BG_BLACK) << 8);
90 			blanked = 1;
91 		}
92 		if (blanked++ < 4)
93 			return 0;
94 		blanked = 1;
95 		sc_vtb_putc(&scp->scr, savs[messagelen - 1], sc->scr_map[0x20],
96 			    (FG_LIGHTGREY | BG_BLACK) << 8);
97 		for (f=messagelen-1; f > 0; f--)
98 			savs[f] = savs[f-1];
99 		f = savs[0];
100 		if ((f % scp->xsize) == 0 ||
101 		    (f % scp->xsize) == scp->xsize - 1 ||
102 		    (random() % 50) == 0)
103 			dirx = -dirx;
104 		if ((f / scp->xsize) == 0 ||
105 		    (f / scp->xsize) == scp->ysize - 1 ||
106 		    (random() % 20) == 0)
107 			diry = -diry;
108 		savs[0] += dirx + diry;
109 		for (f=messagelen-1; f>=0; f--)
110 			sc_vtb_putc(&scp->scr, savs[f], sc->scr_map[save[f]],
111 				    (FG_LIGHTGREY | BG_BLACK) << 8);
112 	}
113 	else {
114 #ifdef PC98
115 		if (epson_machine_id == 0x20) {
116 			outb(0x43f, 0x42);
117 			outb(0x0c17, inb(0xc17) | 0x08);
118 			outb(0x43f, 0x40);
119 		}
120 #endif /* PC98 */
121 		blanked = 0;
122 	}
123 	return 0;
124 }
125 
126 static int
127 snake_init(video_adapter_t *adp)
128 {
129 	messagelen = strlen(ostype) + 1 + strlen(osrelease);
130 	message = malloc(messagelen + 1, M_DEVBUF, M_WAITOK);
131 	sprintf(message, "%s %s", ostype, osrelease);
132 	messagep = malloc(messagelen * sizeof *messagep, M_DEVBUF, M_WAITOK);
133 	return 0;
134 }
135 
136 static int
137 snake_term(video_adapter_t *adp)
138 {
139 	free(message, M_DEVBUF);
140 	free(messagep, M_DEVBUF);
141 	return 0;
142 }
143 
144 static scrn_saver_t snake_module = {
145 	"snake_saver", snake_init, snake_term, snake_saver, NULL,
146 };
147 
148 SAVER_MODULE(snake_saver, snake_module);
149