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); 180