1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1998 Dag-Erling Smørgrav
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer
12 * in this position and unchanged.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/syslog.h>
36 #include <sys/consio.h>
37 #include <sys/fbio.h>
38
39 #include <dev/fb/fbreg.h>
40 #include <dev/fb/splashreg.h>
41 #include <dev/syscons/syscons.h>
42
43 #define SAVER_NAME "rain_saver"
44 #ifdef MAX
45 #undef MAX
46 #endif
47 #define MAX 63 /* number of colors (in addition to black) */
48 #define INCREMENT 4 /* increment between colors */
49
50 #define RED(n) ((n) * 3 + 0)
51 #define GREEN(n) ((n) * 3 + 1)
52 #define BLUE(n) ((n) * 3 + 2)
53
54 #define SET_ORIGIN(adp, o) do { \
55 int oo = o; \
56 if (oo != last_origin) \
57 vidd_set_win_org(adp, last_origin = oo); \
58 } while (0)
59
60 static u_char *vid;
61 static int banksize, scrmode, bpsl, scrw, scrh;
62 static u_char rain_pal[768];
63 static int blanked;
64
65 static void
rain_update(video_adapter_t * adp)66 rain_update(video_adapter_t *adp)
67 {
68 int i, t;
69
70 t = rain_pal[BLUE(MAX)];
71 for (i = MAX; i > 1; i--)
72 rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)];
73 rain_pal[BLUE(1)] = t;
74 vidd_load_palette(adp, rain_pal);
75 }
76
77 static int
rain_saver(video_adapter_t * adp,int blank)78 rain_saver(video_adapter_t *adp, int blank)
79 {
80 int i, j, o, p, pl;
81 u_char temp;
82 int last_origin = -1;
83
84 if (blank) {
85 /* switch to graphics mode */
86 if (blanked <= 0) {
87 pl = splhigh();
88 vidd_set_mode(adp, scrmode);
89 vidd_load_palette(adp, rain_pal);
90 vidd_set_border(adp, 0);
91 blanked++;
92 vid = (u_char *)adp->va_window;
93 banksize = adp->va_window_size;
94 bpsl = adp->va_line_width;
95 splx(pl);
96 for (i = 0; i < bpsl*scrh; i += banksize) {
97 SET_ORIGIN(adp, i);
98 if ((bpsl * scrh - i) < banksize)
99 bzero(vid, bpsl * scrh - i);
100 else
101 bzero(vid, banksize);
102 }
103 SET_ORIGIN(adp, 0);
104 for (i = 0, o = 0, p = 0; i < scrw; i += 2, p += 2) {
105 if (p > banksize) {
106 p -= banksize;
107 o += banksize;
108 SET_ORIGIN(adp, o);
109 }
110 vid[p] = 1 + (random() % MAX);
111 }
112 o = 0; p = 0;
113 for (j = 1; j < scrh; j++)
114 for (i = 0, p = bpsl * (j - 1) - o; i < scrw; i += 2, p+= 2) {
115 while (p > banksize) {
116 p -= banksize;
117 o += banksize;
118 }
119 SET_ORIGIN(adp, o);
120 temp = (vid[p] < MAX) ? 1 + vid[p] : 1;
121 if (p + bpsl < banksize) {
122 vid[p + bpsl] = temp;
123 } else {
124 SET_ORIGIN(adp, o + banksize);
125 vid[p + bpsl - banksize] = temp;
126 }
127 }
128 }
129
130 /* update display */
131 rain_update(adp);
132 } else {
133 blanked = 0;
134 }
135 return (0);
136 }
137
138 static int
rain_init(video_adapter_t * adp)139 rain_init(video_adapter_t *adp)
140 {
141 video_info_t info;
142 int i;
143
144 if (!vidd_get_info(adp, M_VGA_CG320, &info)) {
145 scrmode = M_VGA_CG320;
146 } else {
147 log(LOG_NOTICE,
148 "%s: the console does not support M_VGA_CG320\n",
149 SAVER_NAME);
150 return (ENODEV);
151 }
152
153 scrw = info.vi_width;
154 scrh = info.vi_height;
155
156 /* intialize the palette */
157 for (i = 1; i < MAX; i++)
158 rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)] + INCREMENT;
159
160 return (0);
161 }
162
163 static int
rain_term(video_adapter_t * adp)164 rain_term(video_adapter_t *adp)
165 {
166 return (0);
167 }
168
169 static scrn_saver_t rain_module = {
170 SAVER_NAME,
171 rain_init,
172 rain_term,
173 rain_saver,
174 NULL
175 };
176
177 SAVER_MODULE(rain_saver, rain_module);
178