1 /*- 2 * Copyright (c) 2000 Chiharu Shibata 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 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 * $FreeBSD: src/sys/modules/syscons/dragon/dragon_saver.c,v 1.1.2.1 2003/05/11 01:17:02 murray Exp $ 29 * $DragonFly: src/sys/dev/misc/syscons/dragon/dragon_saver.c,v 1.6 2006/09/03 18:52:26 dillon Exp $ 30 */ 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/module.h> 36 #include <sys/syslog.h> 37 #include <sys/consio.h> 38 #include <sys/fbio.h> 39 #include <sys/thread2.h> 40 41 #include <sys/random.h> 42 43 #include <dev/video/fb/fbreg.h> 44 #include <dev/video/fb/splashreg.h> 45 #include "../syscons.h" 46 47 #define SAVER_NAME "dragon_saver" 48 49 static u_char *vid; 50 static int blanked; 51 52 #define VIDEO_MODE M_VGA_CG320 53 #define VIDEO_MODE_NAME "M_VGA_CG320" 54 #define SCRW 320 55 #define SCRH 200 56 #define ORDER 13 57 #define CURVE 3 58 #define OUT 100 59 60 static int cur_x, cur_y; 61 static int curve; 62 static u_char dragon_pal[3*256]; /* zero-filled by the compiler */ 63 64 static __inline int 65 gpset(int x, int y, int val) 66 { 67 if (x < 0 || y < 0 || SCRW <= x || SCRH <= y) { 68 return 0; 69 } 70 vid[x + y * SCRW] = val; 71 return 1; 72 } 73 74 static int 75 gdraw(int dx, int dy, int val) 76 { 77 int i; 78 int set = 0; 79 80 if (dx != 0) { 81 i = cur_x; 82 cur_x += dx; 83 if (dx < 0) { 84 i += dx; 85 dx = -dx; 86 } 87 /* horizontal line */ 88 for (; dx >= 0; --dx, ++i) { 89 set |= gpset(i, cur_y, val); 90 } 91 } 92 else { /* dy != 0 */ 93 i = cur_y; 94 cur_y += dy; 95 if (dy < 0) { 96 i += dy; 97 dy = -dy; 98 } 99 /* vertical line */ 100 for (; dy >= 0; --dy, ++i) { 101 set |= gpset(cur_x, i, val); 102 } 103 } 104 return set; 105 } 106 107 static void 108 dragon_update(video_adapter_t *adp) 109 { 110 static int i, p, q; 111 static int order, mul, out; 112 static int org_x, org_y; 113 static int dx, dy; 114 static unsigned char fold[1 << (ORDER - 3)]; 115 #define GET_FOLD(x) (fold[(x) >> 3] & (1 << ((x) & 7))) 116 #define SET_FOLD(x) (fold[(x) >> 3] |= (1 << ((x) & 7))) 117 #define CLR_FOLD(x) (fold[(x) >> 3] &= ~(1 << ((x) & 7))) 118 int tmp; 119 120 if (curve > CURVE) { 121 bzero(vid, SCRW*SCRH); 122 123 /* set palette of each curves */ 124 for (tmp = 0; tmp < 3*CURVE; ++tmp) { 125 dragon_pal[3+tmp] = (u_char)krandom(); 126 } 127 load_palette(adp, dragon_pal); 128 129 mul = ((krandom() & 7) + 1) * (SCRW / 320); 130 org_x = krandom() % SCRW; org_y = krandom() % SCRH; 131 132 curve = 0; 133 order = ORDER; 134 } 135 136 if (order >= ORDER) { 137 ++curve; 138 139 cur_x = org_x; cur_y = org_y; 140 141 switch (curve) { 142 case 1: 143 dx = 0; dy = mul; 144 break; 145 case 2: 146 dx = mul; dy = 0; 147 break; 148 case 3: 149 dx = 0; dy = -mul; 150 break; 151 } 152 (void)gdraw(dx, dy, curve); out = 0; 153 154 order = 0; 155 q = p = 0; i = q + 1; 156 } 157 158 if (i > q) { 159 SET_FOLD(p); q = p * 2; 160 161 ++order; 162 i = p; p = q + 1; 163 } 164 165 if (GET_FOLD(q-i) != 0) { 166 CLR_FOLD(i); 167 tmp = dx; dx = dy; dy = -tmp; /* turn right */ 168 } 169 else { 170 SET_FOLD(i); 171 tmp = dx; dx = -dy; dy = tmp; /* turn left */ 172 } 173 if (gdraw(dx, dy, curve)) { 174 out = 0; 175 } 176 else { 177 if (++out > OUT) { 178 order = ORDER; /* force to terminate this curve */ 179 } 180 } 181 ++i; 182 } 183 184 static int 185 dragon_saver(video_adapter_t *adp, int blank) 186 { 187 if (blank) { 188 /* switch to graphics mode */ 189 if (blanked <= 0) { 190 crit_enter(); 191 set_video_mode(adp, VIDEO_MODE); 192 vid = (u_char *)adp->va_window; 193 curve = CURVE + 1; 194 ++blanked; 195 crit_exit(); 196 } 197 198 /* update display */ 199 dragon_update(adp); 200 } 201 else { 202 blanked = 0; 203 } 204 return 0; 205 } 206 207 static int 208 dragon_init(video_adapter_t *adp) 209 { 210 video_info_t info; 211 212 /* check that the console is capable of running in 320x200x256 */ 213 if (get_mode_info(adp, VIDEO_MODE, &info)) { 214 log(LOG_NOTICE, 215 "%s: the console does not support " VIDEO_MODE_NAME "\n", 216 SAVER_NAME); 217 return ENODEV; 218 } 219 220 blanked = 0; 221 return 0; 222 } 223 224 static int 225 dragon_term(video_adapter_t *adp) 226 { 227 return 0; 228 } 229 230 static scrn_saver_t dragon_module = { 231 SAVER_NAME, 232 dragon_init, 233 dragon_term, 234 dragon_saver, 235 NULL, 236 }; 237 238 SAVER_MODULE(dragon_saver, dragon_module); 239