1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1999 Brad Forschinger 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 * without modification, immediately at the beginning of the file. 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 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * brad forschinger, 19990504 <retch@flag.blackened.net> 31 * 32 * written with much help from warp_saver.c 33 * 34 */ 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/module.h> 40 #include <sys/syslog.h> 41 #include <sys/consio.h> 42 #include <sys/malloc.h> 43 #include <sys/fbio.h> 44 45 #include <dev/fb/fbreg.h> 46 #include <dev/fb/splashreg.h> 47 #include <dev/syscons/syscons.h> 48 49 #define SAVER_NAME "fire_saver" 50 51 #define RED(n) ((n) * 3 + 0) 52 #define GREEN(n) ((n) * 3 + 1) 53 #define BLUE(n) ((n) * 3 + 2) 54 55 #define SET_ORIGIN(adp, o) do { \ 56 int oo = o; \ 57 if (oo != last_origin) \ 58 vidd_set_win_org(adp, last_origin = oo); \ 59 } while (0) 60 61 static u_char *buf; 62 static u_char *vid; 63 static int banksize, scrmode, bpsl, scrw, scrh; 64 static u_char fire_pal[768]; 65 static int blanked; 66 67 static void 68 fire_update(video_adapter_t *adp) 69 { 70 int x, y; 71 int o, p; 72 int last_origin = -1; 73 74 /* make a new bottom line */ 75 for (x = 0, y = scrh; x < scrw; x++) 76 buf[x + (y * bpsl)] = random() % 160 + 96; 77 78 /* fade the flames out */ 79 for (y = 0; y < scrh; y++) { 80 for (x = 0; x < scrw; x++) { 81 buf[x + (y * scrw)] = 82 (buf[(x + 0) + ((y + 0) * scrw)] + 83 buf[(x - 1) + ((y + 1) * scrw)] + 84 buf[(x + 0) + ((y + 1) * scrw)] + 85 buf[(x + 1) + ((y + 1) * scrw)]) / 4; 86 if (buf[x + (y * scrw)] > 0) 87 buf[x + (y * scrw)]--; 88 } 89 } 90 91 /* blit our buffer into video ram */ 92 for (y = 0, p = 0, o = 0; y < scrh; y++, p += bpsl) { 93 while (p > banksize) { 94 p -= banksize; 95 o += banksize; 96 } 97 SET_ORIGIN(adp, o); 98 if (p + scrw < banksize) { 99 bcopy(buf + y * scrw, vid + p, scrw); 100 } else { 101 bcopy(buf + y * scrw, vid + p, banksize - p); 102 SET_ORIGIN(adp, o + banksize); 103 bcopy(buf + y * scrw + (banksize - p), vid, 104 scrw - (banksize - p)); 105 p -= banksize; 106 o += banksize; 107 } 108 } 109 110 } 111 112 static int 113 fire_saver(video_adapter_t *adp, int blank) 114 { 115 int pl; 116 117 if (blank) { 118 /* switch to graphics mode */ 119 if (blanked <= 0) { 120 pl = splhigh(); 121 vidd_set_mode(adp, scrmode); 122 vidd_load_palette(adp, fire_pal); 123 blanked++; 124 vid = (u_char *)adp->va_window; 125 banksize = adp->va_window_size; 126 bpsl = adp->va_line_width; 127 splx(pl); 128 vidd_clear(adp); 129 } 130 fire_update(adp); 131 } else { 132 blanked = 0; 133 } 134 135 return 0; 136 } 137 138 static int 139 fire_init(video_adapter_t *adp) 140 { 141 video_info_t info; 142 int i, red, green, blue; 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 buf = (u_char *)malloc(scrw * (scrh + 1), M_DEVBUF, M_NOWAIT); 157 if (buf) { 158 bzero(buf, scrw * (scrh + 1)); 159 } else { 160 log(LOG_NOTICE, 161 "%s: buffer allocation is failed\n", 162 SAVER_NAME); 163 return (ENODEV); 164 } 165 166 /* intialize the palette */ 167 red = green = blue = 0; 168 for (i = 0; i < 256; i++) { 169 red++; 170 if (red > 128) 171 green += 2; 172 fire_pal[RED(i)] = red; 173 fire_pal[GREEN(i)] = green; 174 fire_pal[BLUE(i)] = blue; 175 } 176 177 return (0); 178 } 179 180 static int 181 fire_term(video_adapter_t *adp) 182 { 183 free(buf, M_DEVBUF); 184 return (0); 185 } 186 187 static scrn_saver_t fire_module = { 188 SAVER_NAME, 189 fire_init, 190 fire_term, 191 fire_saver, 192 NULL 193 }; 194 195 SAVER_MODULE(fire_saver, fire_module); 196