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dragon_saver.c
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Editing: dragon_saver.c
/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2000 Chiharu Shibata * 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 <sys/random.h> #include <dev/fb/fbreg.h> #include <dev/fb/splashreg.h> #include <dev/syscons/syscons.h> #define SAVER_NAME "dragon_saver" static u_char *vid; static int blanked; #define VIDEO_MODE M_VGA_CG320 #define VIDEO_MODE_NAME "M_VGA_CG320" #define SCRW 320 #define SCRH 200 #define ORDER 13 #define CURVE 3 #define OUT 100 static int cur_x, cur_y; static int curve; static u_char dragon_pal[3*256]; /* zero-filled by the compiler */ static __inline int gpset(int x, int y, int val) { if (x < 0 || y < 0 || SCRW <= x || SCRH <= y) { return 0; } vid[x + y * SCRW] = val; return 1; } static int gdraw(int dx, int dy, int val) { int i; int set = 0; if (dx != 0) { i = cur_x; cur_x += dx; if (dx < 0) { i += dx; dx = -dx; } /* horizontal line */ for (; dx >= 0; --dx, ++i) { set |= gpset(i, cur_y, val); } } else { /* dy != 0 */ i = cur_y; cur_y += dy; if (dy < 0) { i += dy; dy = -dy; } /* vertical line */ for (; dy >= 0; --dy, ++i) { set |= gpset(cur_x, i, val); } } return set; } static void dragon_update(video_adapter_t *adp) { static int i, p, q; static int order, mul, out; static int org_x, org_y; static int dx, dy; static unsigned char fold[1 << (ORDER - 3)]; #define GET_FOLD(x) (fold[(x) >> 3] & (1 << ((x) & 7))) #define SET_FOLD(x) (fold[(x) >> 3] |= (1 << ((x) & 7))) #define CLR_FOLD(x) (fold[(x) >> 3] &= ~(1 << ((x) & 7))) int tmp; if (curve > CURVE) { vidd_clear(adp); /* set palette of each curves */ for (tmp = 0; tmp < 3*CURVE; ++tmp) { dragon_pal[3+tmp] = (u_char)random(); } vidd_load_palette(adp, dragon_pal); mul = ((random() & 7) + 1) * (SCRW / 320); org_x = random() % SCRW; org_y = random() % SCRH; curve = 0; order = ORDER; } if (order >= ORDER) { ++curve; cur_x = org_x; cur_y = org_y; switch (curve) { case 1: dx = 0; dy = mul; break; case 2: dx = mul; dy = 0; break; case 3: dx = 0; dy = -mul; break; } (void)gdraw(dx, dy, curve); out = 0; order = 0; q = p = 0; i = q + 1; } if (i > q) { SET_FOLD(p); q = p * 2; ++order; i = p; p = q + 1; } if (GET_FOLD(q-i) != 0) { CLR_FOLD(i); tmp = dx; dx = dy; dy = -tmp; /* turn right */ } else { SET_FOLD(i); tmp = dx; dx = -dy; dy = tmp; /* turn left */ } if (gdraw(dx, dy, curve)) { out = 0; } else { if (++out > OUT) { order = ORDER; /* force to terminate this curve */ } } ++i; } static int dragon_saver(video_adapter_t *adp, int blank) { int pl; if (blank) { /* switch to graphics mode */ if (blanked <= 0) { pl = splhigh(); vidd_set_mode(adp, VIDEO_MODE); vid = (u_char *)adp->va_window; curve = CURVE + 1; ++blanked; splx(pl); } /* update display */ dragon_update(adp); } else { blanked = 0; } return 0; } static int dragon_init(video_adapter_t *adp) { video_info_t info; /* check that the console is capable of running in 320x200x256 */ if (vidd_get_info(adp, VIDEO_MODE, &info)) { log(LOG_NOTICE, "%s: the console does not support " VIDEO_MODE_NAME "\n", SAVER_NAME); return ENODEV; } blanked = 0; return 0; } static int dragon_term(video_adapter_t *adp) { return 0; } static scrn_saver_t dragon_module = { SAVER_NAME, dragon_init, dragon_term, dragon_saver, NULL, }; SAVER_MODULE(dragon_saver, dragon_module);
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