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1 /*-
2  * Copyright (c) 1999 Brad Forschinger
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  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  *
26  * $FreeBSD$
27  */
28
29 /*
30  * brad forschinger, 19990504 <retch@flag.blackened.net>
31  * 
32  * written with much help from warp_saver.c
33  * 
34  */
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
40 #include <sys/syslog.h>
41 #include <sys/consio.h>
42 #include <sys/malloc.h>
43 #include <sys/fbio.h>
44
45 #include <dev/fb/fbreg.h>
46 #include <dev/fb/splashreg.h>
47 #include <dev/syscons/syscons.h>
48
49 #define SAVER_NAME       "fire_saver"
50
51 #define RED(n)           ((n) * 3 + 0)
52 #define GREEN(n)         ((n) * 3 + 1)
53 #define BLUE(n)          ((n) * 3 + 2)
54
55 #define SET_ORIGIN(adp, o) do {                         \
56         int oo = o;                                     \
57         if (oo != last_origin)                          \
58             vidd_set_win_org(adp, last_origin = oo);    \
59         } while (0)
60
61 static u_char           *buf;
62 static u_char           *vid;
63 static int               banksize, scrmode, bpsl, scrw, scrh;
64 static u_char            fire_pal[768];
65 static int               blanked;
66
67 static void
68 fire_update(video_adapter_t *adp)
69 {
70         int x, y;
71         int o, p;
72         int last_origin = -1;
73
74         /* make a new bottom line */
75         for (x = 0, y = scrh; x < scrw; x++)
76                 buf[x + (y * bpsl)] = random() % 160 + 96;
77
78         /* fade the flames out */
79         for (y = 0; y < scrh; y++) {
80                 for (x = 0; x < scrw; x++) {
81                         buf[x + (y * scrw)] =
82                             (buf[(x + 0) + ((y + 0) * scrw)] +
83                              buf[(x - 1) + ((y + 1) * scrw)] +
84                              buf[(x + 0) + ((y + 1) * scrw)] +
85                              buf[(x + 1) + ((y + 1) * scrw)]) / 4;
86                         if (buf[x + (y * scrw)] > 0)
87                                 buf[x + (y * scrw)]--;
88                 }
89         }
90
91         /* blit our buffer into video ram */
92         for (y = 0, p = 0, o = 0; y < scrh; y++, p += bpsl) {
93                 while (p > banksize) {
94                         p -= banksize;
95                         o += banksize;
96                 }
97                 SET_ORIGIN(adp, o);
98                 if (p + scrw < banksize) {
99                         bcopy(buf + y * scrw, vid + p, scrw);
100                 } else {
101                         bcopy(buf + y * scrw, vid + p, banksize - p);
102                         SET_ORIGIN(adp, o + banksize);
103                         bcopy(buf + y * scrw + (banksize - p), vid,
104                               scrw - (banksize - p));
105                         p -= banksize;
106                         o += banksize;
107                 }
108         }
109
110 }
111
112 static int
113 fire_saver(video_adapter_t *adp, int blank)
114 {
115         int pl;
116
117         if (blank) {
118                 /* switch to graphics mode */
119                 if (blanked <= 0) {
120                         pl = splhigh();
121                         vidd_set_mode(adp, scrmode);
122                         vidd_load_palette(adp, fire_pal);
123                         blanked++;
124                         vid = (u_char *)adp->va_window;
125                         banksize = adp->va_window_size;
126                         bpsl = adp->va_line_width;
127                         splx(pl);
128                         vidd_clear(adp);
129                 }
130                 fire_update(adp);
131         } else {
132                 blanked = 0;
133         }
134
135     return 0;
136 }
137
138 static int
139 fire_init(video_adapter_t *adp)
140 {
141         video_info_t info;
142         int i, red, green, blue;
143
144         if (!vidd_get_info(adp, M_VGA_CG320, &info)) {
145                 scrmode = M_VGA_CG320;
146         } else if (!vidd_get_info(adp, M_PC98_PEGC640x480, &info)) {
147                 scrmode = M_PC98_PEGC640x480;
148         } else if (!vidd_get_info(adp, M_PC98_PEGC640x400, &info)) {
149                 scrmode = M_PC98_PEGC640x400;
150         } else {
151                 log(LOG_NOTICE,
152                     "%s: the console does not support M_VGA_CG320\n",
153                     SAVER_NAME);
154                 return (ENODEV);
155         }
156     
157         scrw = info.vi_width;
158         scrh = info.vi_height;
159
160         buf = (u_char *)malloc(scrw * (scrh + 1), M_DEVBUF, M_NOWAIT);
161         if (buf) {
162                 bzero(buf, scrw * (scrh + 1));
163         } else {
164                 log(LOG_NOTICE,
165                     "%s: buffer allocation is failed\n",
166                     SAVER_NAME);
167                 return (ENODEV);
168         }
169
170         /* intialize the palette */
171         red = green = blue = 0;
172         for (i = 0; i < 256; i++) {
173                 red++;
174                 if (red > 128)
175                         green += 2;
176                 fire_pal[RED(i)] = red;
177                 fire_pal[GREEN(i)] = green;
178                 fire_pal[BLUE(i)] = blue;
179         }
180
181         return (0);
182 }
183
184 static int
185 fire_term(video_adapter_t *adp)
186 {
187         free(buf, M_DEVBUF);
188         return (0);
189 }
190
191 static scrn_saver_t fire_module = {
192         SAVER_NAME,
193         fire_init,
194         fire_term,
195         fire_saver,
196         NULL
197 };
198
199 SAVER_MODULE(fire_saver, fire_module);