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1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1998 Dag-Erling Coïdan 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  * $FreeBSD$
31  */
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
37 #include <sys/syslog.h>
38 #include <sys/consio.h>
39 #include <sys/fbio.h>
40
41 #include <dev/fb/fbreg.h>
42 #include <dev/fb/splashreg.h>
43 #include <dev/syscons/syscons.h>
44
45 #define SAVER_NAME       "warp_saver"
46 #define SPP              15
47 #define STARS            (SPP * (1 + 2 + 4 + 8))
48
49 #define SET_ORIGIN(adp, o) do {                         \
50         int oo = o;                                     \
51         if (oo != last_origin)                          \
52             vidd_set_win_org(adp, last_origin = oo);            \
53         } while (0)
54
55 static u_char           *vid;
56 static int               banksize, scrmode, bpsl, scrw, scrh;
57 static int               blanked;
58 static int               star[STARS];
59 static u_char            warp_pal[768] = {
60         0x00, 0x00, 0x00,
61         0x66, 0x66, 0x66,
62         0x99, 0x99, 0x99,
63         0xcc, 0xcc, 0xcc,
64         0xff, 0xff, 0xff
65         /* the rest is zero-filled by the compiler */
66 };
67
68 static void
69 warp_update(video_adapter_t *adp)
70 {
71         int i, j, k, n, o, p;
72         int last_origin = -1;
73
74         for (i = 1, k = 0, n = SPP*8; i < 5; i++, n /= 2) {
75                 for (j = 0; j < n; j++, k++) {
76                         p = (star[k] / scrw) *  bpsl + (star[k] % scrw);
77                         o = 0;
78                         while (p > banksize) {
79                                 p -= banksize;
80                                 o += banksize;
81                         }
82                         SET_ORIGIN(adp, o);
83                         vid[p] = 0;
84                         star[k] += i;
85                         if (star[k] > scrw*scrh)
86                                 star[k] -= scrw*scrh;
87                         p = (star[k] / scrw) *  bpsl + (star[k] % scrw);
88                         o = 0;
89                         while (p > banksize) {
90                                 p -= banksize;
91                                 o += banksize;
92                         }
93                         SET_ORIGIN(adp, o);
94                         vid[p] = i;
95                 }
96         }
97 }
98
99 static int
100 warp_saver(video_adapter_t *adp, int blank)
101 {
102         int pl;
103         
104         if (blank) {
105                 /* switch to graphics mode */
106                 if (blanked <= 0) {
107                         pl = splhigh();
108                         vidd_set_mode(adp, scrmode);
109                         vidd_load_palette(adp, warp_pal);
110                         vidd_set_border(adp, 0);
111                         blanked++;
112                         vid = (u_char *)adp->va_window;
113                         banksize = adp->va_window_size;
114                         bpsl = adp->va_line_width;
115                         splx(pl);
116                         vidd_clear(adp);
117                 }
118                 /* update display */
119                 warp_update(adp);
120         } else {
121                 blanked = 0;
122         }
123         return (0);
124 }
125
126 static int
127 warp_init(video_adapter_t *adp)
128 {
129         video_info_t info;
130         int i;
131         
132         if (!vidd_get_info(adp, M_VGA_CG320, &info)) {
133                 scrmode = M_VGA_CG320;
134         } else {
135                 log(LOG_NOTICE,
136                     "%s: the console does not support M_VGA_CG320\n",
137                     SAVER_NAME);
138                 return (ENODEV);
139         }
140         
141         scrw = info.vi_width;
142         scrh = info.vi_height;
143
144         /* randomize the star field */
145         for (i = 0; i < STARS; i++)
146                 star[i] = random() % (scrw * scrh);
147         
148         return (0);
149 }
150
151 static int
152 warp_term(video_adapter_t *adp)
153 {
154         return (0);
155 }
156
157 static scrn_saver_t warp_module = {
158         SAVER_NAME,
159         warp_init,
160         warp_term,
161         warp_saver,
162         NULL
163 };
164
165 SAVER_MODULE(warp_saver, warp_module);