sys/dev/syscons/rain/rain_saver.c

   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       "rain_saver"
  46 #ifdef MAX
  47 #undef MAX
  48 #endif
  49 #define MAX              63     /* number of colors (in addition to black) */
  50 #define INCREMENT        4      /* increment between colors */
  51
  52 #define RED(n)           ((n) * 3 + 0)
  53 #define GREEN(n)         ((n) * 3 + 1)
  54 #define BLUE(n)          ((n) * 3 + 2)
  55
  56 #define SET_ORIGIN(adp, o) do {                         \
  57         int oo = o;                                     \
  58         if (oo != last_origin)                          \
  59             vidd_set_win_org(adp, last_origin = oo);    \
  60         } while (0)
  61
  62 static u_char           *vid;
  63 static int               banksize, scrmode, bpsl, scrw, scrh;
  64 static u_char            rain_pal[768];
  65 static int               blanked;
  66
  67 static void
  68 rain_update(video_adapter_t *adp)
  69 {
  70         int i, t;
  71
  72         t = rain_pal[BLUE(MAX)];
  73         for (i = MAX; i > 1; i--)
  74                 rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)];
  75         rain_pal[BLUE(1)] = t;
  76         vidd_load_palette(adp, rain_pal);
  77 }
  78
  79 static int
  80 rain_saver(video_adapter_t *adp, int blank)
  81 {
  82         int i, j, o, p, pl;
  83         u_char temp;
  84         int last_origin = -1;
  85
  86         if (blank) {
  87                 /* switch to graphics mode */
  88                 if (blanked <= 0) {
  89                         pl = splhigh();
  90                         vidd_set_mode(adp, scrmode);
  91                         vidd_load_palette(adp, rain_pal);
  92                         vidd_set_border(adp, 0);
  93                         blanked++;
  94                         vid = (u_char *)adp->va_window;
  95                         banksize = adp->va_window_size;
  96                         bpsl = adp->va_line_width;
  97                         splx(pl);
  98                         for (i = 0; i < bpsl*scrh; i += banksize) {
  99                                 SET_ORIGIN(adp, i);
 100                                 if ((bpsl * scrh - i) < banksize)
 101                                         bzero(vid, bpsl * scrh - i);
 102                                 else
 103                                         bzero(vid, banksize);
 104                         }
 105                         SET_ORIGIN(adp, 0);
 106                         for (i = 0, o = 0, p = 0; i < scrw; i += 2, p += 2) {
 107                                 if (p > banksize) {
 108                                         p -= banksize;
 109                                         o += banksize;
 110                                         SET_ORIGIN(adp, o);
 111                                 }
 112                                 vid[p] = 1 + (random() % MAX);
 113                         }
 114                         o = 0; p = 0;
 115                         for (j = 1; j < scrh; j++)
 116                           for (i = 0, p = bpsl * (j - 1) - o; i < scrw; i += 2, p+= 2) {
 117                                 while (p > banksize) {
 118                                         p -= banksize;
 119                                         o += banksize;
 120                                 }
 121                                 SET_ORIGIN(adp, o);
 122                                 temp = (vid[p] < MAX) ? 1 + vid[p] : 1;
 123                                 if (p + bpsl < banksize) {
 124                                         vid[p + bpsl] = temp;
 125                                 } else {
 126                                         SET_ORIGIN(adp, o + banksize);
 127                                         vid[p + bpsl - banksize] = temp;
 128                                 }
 129                           }
 130                 }
 131
 132                 /* update display */
 133                 rain_update(adp);
 134         } else {
 135                 blanked = 0;
 136         }
 137         return (0);
 138 }
 139
 140 static int
 141 rain_init(video_adapter_t *adp)
 142 {
 143         video_info_t info;
 144         int i;
 145
 146         if (!vidd_get_info(adp, M_VGA_CG320, &info)) {
 147                 scrmode = M_VGA_CG320;
 148         } else {
 149                 log(LOG_NOTICE,
 150                     "%s: the console does not support M_VGA_CG320\n",
 151                     SAVER_NAME);
 152                 return (ENODEV);
 153         }
 154
 155         scrw = info.vi_width;
 156         scrh = info.vi_height;
 157
 158         /* intialize the palette */
 159         for (i = 1; i < MAX; i++)
 160                 rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)] + INCREMENT;
 161
 162         return (0);
 163 }
 164
 165 static int
 166 rain_term(video_adapter_t *adp)
 167 {
 168         return (0);
 169 }
 170
 171 static scrn_saver_t rain_module = {
 172         SAVER_NAME,
 173         rain_init,
 174         rain_term,
 175         rain_saver,
 176         NULL
 177 };
 178
 179 SAVER_MODULE(rain_saver, rain_module);