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fire_saver.c
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Editing: fire_saver.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 1999 Brad Forschinger * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer, * without modification, immediately at the beginning of the file. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD$ */ /* * brad forschinger, 19990504 <retch@flag.blackened.net> * * written with much help from warp_saver.c * */ #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/module.h> #include <sys/syslog.h> #include <sys/consio.h> #include <sys/malloc.h> #include <sys/fbio.h> #include <dev/fb/fbreg.h> #include <dev/fb/splashreg.h> #include <dev/syscons/syscons.h> #define SAVER_NAME "fire_saver" #define RED(n) ((n) * 3 + 0) #define GREEN(n) ((n) * 3 + 1) #define BLUE(n) ((n) * 3 + 2) #define SET_ORIGIN(adp, o) do { \ int oo = o; \ if (oo != last_origin) \ vidd_set_win_org(adp, last_origin = oo); \ } while (0) static u_char *buf; static u_char *vid; static int banksize, scrmode, bpsl, scrw, scrh; static u_char fire_pal[768]; static int blanked; static void fire_update(video_adapter_t *adp) { int x, y; int o, p; int last_origin = -1; /* make a new bottom line */ for (x = 0, y = scrh; x < scrw; x++) buf[x + (y * bpsl)] = random() % 160 + 96; /* fade the flames out */ for (y = 0; y < scrh; y++) { for (x = 0; x < scrw; x++) { buf[x + (y * scrw)] = (buf[(x + 0) + ((y + 0) * scrw)] + buf[(x - 1) + ((y + 1) * scrw)] + buf[(x + 0) + ((y + 1) * scrw)] + buf[(x + 1) + ((y + 1) * scrw)]) / 4; if (buf[x + (y * scrw)] > 0) buf[x + (y * scrw)]--; } } /* blit our buffer into video ram */ for (y = 0, p = 0, o = 0; y < scrh; y++, p += bpsl) { while (p > banksize) { p -= banksize; o += banksize; } SET_ORIGIN(adp, o); if (p + scrw < banksize) { bcopy(buf + y * scrw, vid + p, scrw); } else { bcopy(buf + y * scrw, vid + p, banksize - p); SET_ORIGIN(adp, o + banksize); bcopy(buf + y * scrw + (banksize - p), vid, scrw - (banksize - p)); p -= banksize; o += banksize; } } } static int fire_saver(video_adapter_t *adp, int blank) { int pl; if (blank) { /* switch to graphics mode */ if (blanked <= 0) { pl = splhigh(); vidd_set_mode(adp, scrmode); vidd_load_palette(adp, fire_pal); blanked++; vid = (u_char *)adp->va_window; banksize = adp->va_window_size; bpsl = adp->va_line_width; splx(pl); vidd_clear(adp); } fire_update(adp); } else { blanked = 0; } return 0; } static int fire_init(video_adapter_t *adp) { video_info_t info; int i, red, green, blue; if (!vidd_get_info(adp, M_VGA_CG320, &info)) { scrmode = M_VGA_CG320; } else { log(LOG_NOTICE, "%s: the console does not support M_VGA_CG320\n", SAVER_NAME); return (ENODEV); } scrw = info.vi_width; scrh = info.vi_height; buf = (u_char *)malloc(scrw * (scrh + 1), M_DEVBUF, M_NOWAIT); if (buf) { bzero(buf, scrw * (scrh + 1)); } else { log(LOG_NOTICE, "%s: buffer allocation is failed\n", SAVER_NAME); return (ENODEV); } /* intialize the palette */ red = green = blue = 0; for (i = 0; i < 256; i++) { red++; if (red > 128) green += 2; fire_pal[RED(i)] = red; fire_pal[GREEN(i)] = green; fire_pal[BLUE(i)] = blue; } return (0); } static int fire_term(video_adapter_t *adp) { free(buf, M_DEVBUF); return (0); } static scrn_saver_t fire_module = { SAVER_NAME, fire_init, fire_term, fire_saver, NULL }; SAVER_MODULE(fire_saver, fire_module);
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