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rain_saver.c
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Editing: rain_saver.c
/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1998 Dag-Erling Coïdan Smørgrav * 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 * in this position and unchanged. * 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * 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. * * $FreeBSD$ */ #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/fbio.h> #include <dev/fb/fbreg.h> #include <dev/fb/splashreg.h> #include <dev/syscons/syscons.h> #define SAVER_NAME "rain_saver" #ifdef MAX #undef MAX #endif #define MAX 63 /* number of colors (in addition to black) */ #define INCREMENT 4 /* increment between colors */ #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 *vid; static int banksize, scrmode, bpsl, scrw, scrh; static u_char rain_pal[768]; static int blanked; static void rain_update(video_adapter_t *adp) { int i, t; t = rain_pal[BLUE(MAX)]; for (i = MAX; i > 1; i--) rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)]; rain_pal[BLUE(1)] = t; vidd_load_palette(adp, rain_pal); } static int rain_saver(video_adapter_t *adp, int blank) { int i, j, o, p, pl; u_char temp; int last_origin = -1; if (blank) { /* switch to graphics mode */ if (blanked <= 0) { pl = splhigh(); vidd_set_mode(adp, scrmode); vidd_load_palette(adp, rain_pal); vidd_set_border(adp, 0); blanked++; vid = (u_char *)adp->va_window; banksize = adp->va_window_size; bpsl = adp->va_line_width; splx(pl); for (i = 0; i < bpsl*scrh; i += banksize) { SET_ORIGIN(adp, i); if ((bpsl * scrh - i) < banksize) bzero(vid, bpsl * scrh - i); else bzero(vid, banksize); } SET_ORIGIN(adp, 0); for (i = 0, o = 0, p = 0; i < scrw; i += 2, p += 2) { if (p > banksize) { p -= banksize; o += banksize; SET_ORIGIN(adp, o); } vid[p] = 1 + (random() % MAX); } o = 0; p = 0; for (j = 1; j < scrh; j++) for (i = 0, p = bpsl * (j - 1) - o; i < scrw; i += 2, p+= 2) { while (p > banksize) { p -= banksize; o += banksize; } SET_ORIGIN(adp, o); temp = (vid[p] < MAX) ? 1 + vid[p] : 1; if (p + bpsl < banksize) { vid[p + bpsl] = temp; } else { SET_ORIGIN(adp, o + banksize); vid[p + bpsl - banksize] = temp; } } } /* update display */ rain_update(adp); } else { blanked = 0; } return (0); } static int rain_init(video_adapter_t *adp) { video_info_t info; int i; 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; /* intialize the palette */ for (i = 1; i < MAX; i++) rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)] + INCREMENT; return (0); } static int rain_term(video_adapter_t *adp) { return (0); } static scrn_saver_t rain_module = { SAVER_NAME, rain_init, rain_term, rain_saver, NULL }; SAVER_MODULE(rain_saver, rain_module);
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