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 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 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 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 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