git.hungrycats.org Git - xscreensaver/blob - hacks/worm.c

   1
   2 /* -*- Mode: C; tab-width: 4 -*- */
   3 /* worm --- draw wiggly worms */
   4
   5 #if 0
   6 static const char sccsid[] = "@(#)worm.c        4.04 97/07/28 xlockmore";
   7 #endif
   8
   9 /*-
  10  * Copyright (c) 1991 by Patrick J. Naughton.
  11  *
  12  * Permission to use, copy, modify, and distribute this software and its
  13  * documentation for any purpose and without fee is hereby granted,
  14  * provided that the above copyright notice appear in all copies and that
  15  * both that copyright notice and this permission notice appear in
  16  * supporting documentation.
  17  *
  18  * This file is provided AS IS with no warranties of any kind.  The author
  19  * shall have no liability with respect to the infringement of copyrights,
  20  * trade secrets or any patents by this file or any part thereof.  In no
  21  * event will the author be liable for any lost revenue or profits or
  22  * other special, indirect and consequential damages.
  23  *
  24  * Revision History:
  25  * 10-May-97: Compatible with xscreensaver
  26  * 03-Sep-96: fixed bug in allocation of space for worms, added 3d support
  27  *            Henrik Theiling <theiling@coli.uni-sb.de>
  28  * 27-Sep-95: put back malloc
  29  * 23-Sep-93: got rid of "rint". (David Bagley)
  30  * 27-Sep-91: got rid of all malloc calls since there were no calls to free().
  31  * 25-Sep-91: Integrated into X11R5 contrib xlock.
  32  *
  33  * Adapted from a concept in the Dec 87 issue of Scientific American p. 142.
  34  *
  35  * SunView version: Brad Taylor <brad@sun.com>
  36  * X11 version: Dave Lemke <lemke@ncd.com>
  37  * xlock version: Boris Putanec <bp@cs.brown.edu>
  38  */
  39
  40 #ifdef STANDALONE
  41 # define DEFAULTS       "*delay:  17000 \n"     \
  42                                         "*count:  -20 \n"               \
  43                                         "*cycles:  10 \n"               \
  44                                         "*size:   -3 \n"                \
  45                                         "*ncolors: 150 \n"              \
  46                                         "*use3d:   False \n"    \
  47                                         "*delta3d: 1.5 \n"              \
  48                                         "*right3d: red \n"              \
  49                                         "*left3d:  blue \n"             \
  50                                         "*both3d:  magenta \n"  \
  51                                         "*none3d:  black \n" \
  52                                         "*fpsSolid:  true \n" \
  53
  54 # define SMOOTH_COLORS
  55 # define reshape_worm 0
  56 # define worm_handle_event 0
  57 # include "xlockmore.h"         /* in xscreensaver distribution */
  58 #else /* STANDALONE */
  59 # include "xlock.h"             /* in xlockmore distribution */
  60 #endif /* STANDALONE */
  61
  62 ENTRYPOINT ModeSpecOpt worm_opts =
  63 {0, NULL, 0, NULL, NULL};
  64
  65 #define MINSIZE 1
  66
  67 #define SEGMENTS  36
  68 #define MINWORMS 1
  69
  70 #define MAXZ      750
  71 #define MINZ      100
  72 #define SCREENZ   200
  73 #define GETZDIFF(z) (MI_DELTA3D(mi)*20.0*(1.0-(SCREENZ)/((float)(z)+MINZ)))
  74 #define IRINT(x) ((int)(((x)>0.0)?(x)+0.5:(x)-0.5))
  75
  76 /* How many segments to draw per cycle when redrawing */
  77 #define REDRAWSTEP 3
  78
  79 typedef struct {
  80         XPoint     *circ;
  81         int        *diffcirc;
  82         int         dir, dir2;
  83         int         tail;
  84         int         x, y, z;
  85         int         redrawing, redrawpos;
  86 } wormstuff;
  87
  88 typedef struct {
  89         int         xsize, ysize, zsize;
  90         int         wormlength;
  91         int         nc;
  92         int         nw;
  93         int         circsize;
  94         wormstuff  *worm;
  95         XRectangle *rects;      /* [NUMCOLORS * batchcount/NUMCOLORS+1] */
  96         int         maxsize;
  97         int        *size;
  98         unsigned int chromo;
  99 } wormstruct;
 100
 101 static float sintab[SEGMENTS];
 102 static float costab[SEGMENTS];
 103 static int  init_table = 0;
 104
 105 static wormstruct *worms = NULL;
 106
 107 static void
 108 worm_doit(ModeInfo * mi, int which, unsigned long color)
 109 {
 110         Display    *display = MI_DISPLAY(mi);
 111         Window      window = MI_WINDOW(mi);
 112         GC          gc = MI_GC(mi);
 113         wormstruct *wp = &worms[MI_SCREEN(mi)];
 114         wormstuff  *ws = &wp->worm[which];
 115         int         x, y, z;
 116         int         diff;
 117
 118         ws->tail++;
 119         if (ws->tail == wp->wormlength)
 120                 ws->tail = 0;
 121
 122         x = ws->circ[ws->tail].x;
 123         y = ws->circ[ws->tail].y;
 124
 125         if (MI_WIN_IS_USE3D(mi)) {
 126                 diff = ws->diffcirc[ws->tail];
 127                 if (MI_WIN_IS_INSTALL(mi)) {
 128                         XSetForeground(display, gc, MI_NONE_COLOR(mi));
 129                         XFillRectangle(display, window, gc, x - diff, y,
 130                                        wp->circsize, wp->circsize);
 131                         XFillRectangle(display, window, gc, x + diff, y,
 132                                        wp->circsize, wp->circsize);
 133                 } else {
 134                         XClearArea(display, window, x - diff, y,
 135                                    wp->circsize, wp->circsize, False);
 136                         XClearArea(display, window, x + diff, y,
 137                                    wp->circsize, wp->circsize, False);
 138                 }
 139         } else
 140                 XClearArea(display, window, x, y, wp->circsize, wp->circsize, False);
 141
 142         if (LRAND() & 1)
 143                 ws->dir = (ws->dir + 1) % SEGMENTS;
 144         else
 145                 ws->dir = (ws->dir + SEGMENTS - 1) % SEGMENTS;
 146
 147         x = (ws->x + IRINT((float) wp->circsize * costab[ws->dir]) +
 148              wp->xsize) % wp->xsize;
 149         y = (ws->y + IRINT((float) wp->circsize * sintab[ws->dir]) +
 150              wp->ysize) % wp->ysize;
 151
 152         ws->circ[ws->tail].x = x;
 153         ws->circ[ws->tail].y = y;
 154         ws->x = x;
 155         ws->y = y;
 156
 157         if (MI_WIN_IS_USE3D(mi)) {
 158                 if (LRAND() & 1)
 159                         ws->dir2 = (ws->dir2 + 1) % SEGMENTS;
 160                 else
 161                         ws->dir2 = (ws->dir2 + SEGMENTS - 1) % SEGMENTS;
 162                 /* for the z-axis the wrap-around looks bad, so worms should just turn around. */
 163                 z = (int) (ws->z + wp->circsize * sintab[ws->dir2]);
 164                 if (z < 0 || z >= wp->zsize)
 165                         z = (int) (ws->z - wp->circsize * sintab[ws->dir2]);
 166
 167                 diff = (int) (GETZDIFF(z) + 0.5);       /* ROUND */
 168                 ws->diffcirc[ws->tail] = diff;
 169
 170                 ws->z = z;
 171
 172                 /* right eye */
 173                 color = 0;
 174                 wp->rects[color * wp->maxsize + wp->size[color]].x = x + diff;
 175                 wp->rects[color * wp->maxsize + wp->size[color]].y = y;
 176                 wp->size[color]++;
 177
 178                 /* left eye */
 179                 color = 1;
 180                 wp->rects[color * wp->maxsize + wp->size[color]].x = x - diff;
 181                 wp->rects[color * wp->maxsize + wp->size[color]].y = y;
 182                 wp->size[color]++;
 183
 184 #if 0
 185                 if (ws->redrawing) {    /* Too hard for now */
 186                         int         j;
 187
 188                         for (j = 0; j < REDRAWSTEP; j++) {
 189                                 int         k = (ws->tail - ws->redrawpos + wp->wormlength)
 190                                 % wp->wormlength;
 191
 192                                 color = 0;
 193                                 wp->rects[color * wp->maxsize + wp->size[color]].x =
 194                                         ws->circ[k].x + ws->diffcirc[k];
 195                                 wp->rects[color * wp->maxsize + wp->size[color]].y =
 196                                         ws->circ[k].y;
 197                                 wp->size[color]++;
 198
 199                                 color = 1;
 200                                 wp->rects[color * wp->maxsize + wp->size[color]].x =
 201                                         ws->circ[k].x - ws->diffcirc[k];
 202                                 wp->rects[color * wp->maxsize + wp->size[color]].y =
 203                                         ws->circ[k].y;
 204                                 wp->size[color]++;
 205
 206                                 if (++(ws->redrawpos) >= wp->wormlength) {
 207                                         ws->redrawing = 0;
 208                                         break;
 209                                 }
 210                         }
 211                 }
 212 #endif
 213
 214         } else {
 215
 216                 wp->rects[color * wp->maxsize + wp->size[color]].x = x;
 217                 wp->rects[color * wp->maxsize + wp->size[color]].y = y;
 218                 wp->size[color]++;
 219                 if (ws->redrawing) {
 220                         int         j;
 221
 222                         ws->redrawpos++;
 223                         /* Compensates for the changed ws->tail
 224                            since the last callback. */
 225
 226                         for (j = 0; j < REDRAWSTEP; j++) {
 227                                 int         k = (ws->tail - ws->redrawpos + wp->wormlength)
 228                                 % wp->wormlength;
 229
 230                                 wp->rects[color * wp->maxsize + wp->size[color]].x = ws->circ[k].x;
 231                                 wp->rects[color * wp->maxsize + wp->size[color]].y = ws->circ[k].y;
 232                                 wp->size[color]++;
 233
 234                                 if (++(ws->redrawpos) >= wp->wormlength) {
 235                                         ws->redrawing = 0;
 236                                         break;
 237                                 }
 238                         }
 239                 }
 240         }
 241 }
 242
 243 static void
 244 free_worms(wormstruct * wp)
 245 {
 246         int         wn;
 247
 248         if (wp->worm) {
 249                 for (wn = 0; wn < wp->nw; wn++) {
 250                         if (wp->worm[wn].circ)
 251                                 (void) free((void *) wp->worm[wn].circ);
 252                         if (wp->worm[wn].diffcirc)
 253                                 (void) free((void *) wp->worm[wn].diffcirc);
 254                 }
 255                 (void) free((void *) wp->worm);
 256                 wp->worm = NULL;
 257         }
 258         if (wp->rects) {
 259                 (void) free((void *) wp->rects);
 260                 wp->rects = NULL;
 261         }
 262         if (wp->size) {
 263                 (void) free((void *) wp->size);
 264                 wp->size = NULL;
 265         }
 266 }
 267
 268 ENTRYPOINT void
 269 init_worm (ModeInfo * mi)
 270 {
 271         wormstruct *wp;
 272         int         size = MI_SIZE(mi);
 273         int         i, j;
 274
 275         if (worms == NULL) {
 276                 if ((worms = (wormstruct *) calloc(MI_NUM_SCREENS(mi),
 277                                                sizeof (wormstruct))) == NULL)
 278                         return;
 279         }
 280         wp = &worms[MI_SCREEN(mi)];
 281         if (MI_NPIXELS(mi) <= 2 || MI_WIN_IS_USE3D(mi))
 282                 wp->nc = 2;
 283         else
 284                 wp->nc = MI_NPIXELS(mi);
 285         if (wp->nc > NUMCOLORS)
 286                 wp->nc = NUMCOLORS;
 287
 288         free_worms(wp);
 289         wp->nw = MI_BATCHCOUNT(mi);
 290         if (wp->nw < -MINWORMS)
 291                 wp->nw = NRAND(-wp->nw - MINWORMS + 1) + MINWORMS;
 292         else if (wp->nw < MINWORMS)
 293                 wp->nw = MINWORMS;
 294         if (!wp->worm)
 295                 wp->worm = (wormstuff *) malloc(wp->nw * sizeof (wormstuff));
 296
 297         if (!wp->size)
 298                 wp->size = (int *) malloc(NUMCOLORS * sizeof (int));
 299
 300         wp->maxsize = (REDRAWSTEP + 1) * wp->nw;        /*  / wp->nc + 1; */
 301         if (!wp->rects)
 302                 wp->rects =
 303                         (XRectangle *) malloc(wp->maxsize * NUMCOLORS * sizeof (XRectangle));
 304
 305
 306         if (!init_table) {
 307                 init_table = 1;
 308                 for (i = 0; i < SEGMENTS; i++) {
 309                         sintab[i] = SINF(i * 2.0 * M_PI / SEGMENTS);
 310                         costab[i] = COSF(i * 2.0 * M_PI / SEGMENTS);
 311                 }
 312         }
 313         wp->xsize = MI_WIN_WIDTH(mi);
 314         wp->ysize = MI_WIN_HEIGHT(mi);
 315         wp->zsize = MAXZ - MINZ + 1;
 316         if (MI_NPIXELS(mi) > 2)
 317                 wp->chromo = NRAND(MI_NPIXELS(mi));
 318
 319         if (size < -MINSIZE)
 320                 wp->circsize = NRAND(-size - MINSIZE + 1) + MINSIZE;
 321         else if (size < MINSIZE)
 322                 wp->circsize = MINSIZE;
 323         else
 324                 wp->circsize = size;
 325
 326         for (i = 0; i < wp->nc; i++) {
 327                 for (j = 0; j < wp->maxsize; j++) {
 328                         wp->rects[i * wp->maxsize + j].width = wp->circsize;
 329                         wp->rects[i * wp->maxsize + j].height = wp->circsize;
 330
 331                 }
 332         }
 333         (void) memset((char *) wp->size, 0, wp->nc * sizeof (int));
 334
 335         wp->wormlength = (int) sqrt(wp->xsize + wp->ysize) *
 336                 MI_CYCLES(mi) / 8;      /* Fudge this to something reasonable */
 337         for (i = 0; i < wp->nw; i++) {
 338                 wp->worm[i].circ = (XPoint *) malloc(wp->wormlength * sizeof (XPoint));
 339                 wp->worm[i].diffcirc = (int *) malloc(wp->wormlength * sizeof (int));
 340
 341                 for (j = 0; j < wp->wormlength; j++) {
 342                         wp->worm[i].circ[j].x = wp->xsize / 2;
 343                         wp->worm[i].circ[j].y = wp->ysize / 2;
 344                         if (MI_WIN_IS_USE3D(mi))
 345                                 wp->worm[i].diffcirc[j] = 0;
 346                 }
 347                 wp->worm[i].dir = NRAND(SEGMENTS);
 348                 wp->worm[i].dir2 = NRAND(SEGMENTS);
 349                 wp->worm[i].tail = 0;
 350                 wp->worm[i].x = wp->xsize / 2;
 351                 wp->worm[i].y = wp->ysize / 2;
 352                 wp->worm[i].z = SCREENZ - MINZ;
 353                 wp->worm[i].redrawing = 0;
 354         }
 355
 356         if (MI_WIN_IS_INSTALL(mi) && MI_WIN_IS_USE3D(mi)) {
 357                 XSetForeground(MI_DISPLAY(mi), MI_GC(mi), MI_NONE_COLOR(mi));
 358                 XFillRectangle(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
 359                                0, 0, wp->xsize, wp->ysize);
 360         } else
 361                 XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
 362 }
 363
 364 ENTRYPOINT void
 365 draw_worm (ModeInfo * mi)
 366 {
 367         Display    *display = MI_DISPLAY(mi);
 368         Window      window = MI_WINDOW(mi);
 369         GC          gc = MI_GC(mi);
 370         wormstruct *wp = &worms[MI_SCREEN(mi)];
 371         unsigned long wcolor;
 372         int         i;
 373
 374         (void) memset((char *) wp->size, 0, wp->nc * sizeof (int));
 375
 376         for (i = 0; i < wp->nw; i++) {
 377                 if (MI_NPIXELS(mi) > 2) {
 378                         wcolor = (i + wp->chromo) % wp->nc;
 379
 380                         worm_doit(mi, i, wcolor);
 381                 } else
 382                         worm_doit(mi, i, (unsigned long) 0);
 383         }
 384
 385         if (MI_WIN_IS_USE3D(mi)) {
 386                 if (MI_WIN_IS_INSTALL(mi))
 387                         XSetFunction(display, gc, GXor);
 388                 XSetForeground(display, gc, MI_RIGHT_COLOR(mi));
 389                 XFillRectangles(display, window, gc, &(wp->rects[0]), wp->size[0]);
 390
 391                 XSetForeground(display, gc, MI_LEFT_COLOR(mi));
 392                 XFillRectangles(display, window, gc, &(wp->rects[wp->maxsize]), wp->size[1]);
 393                 if (MI_WIN_IS_INSTALL(mi))
 394                         XSetFunction(display, gc, GXcopy);
 395         } else if (MI_NPIXELS(mi) > 2) {
 396                 for (i = 0; i < wp->nc; i++) {
 397                         XSetForeground(display, gc, MI_PIXEL(mi, i));
 398                         XFillRectangles(display, window, gc, &(wp->rects[i * wp->maxsize]), wp->size[i]);
 399                 }
 400         } else {
 401                 XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
 402                 XFillRectangles(display, window, gc,
 403                                 &(wp->rects[0]), wp->size[0]);
 404         }
 405
 406         if (++wp->chromo == (unsigned long) wp->nc)
 407                 wp->chromo = 0;
 408 }
 409
 410 ENTRYPOINT void
 411 release_worm(ModeInfo * mi)
 412 {
 413         if (worms != NULL) {
 414                 int         screen;
 415
 416                 for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++)
 417                         free_worms(&worms[screen]);
 418                 (void) free((void *) worms);
 419                 worms = NULL;
 420         }
 421 }
 422
 423 ENTRYPOINT void
 424 refresh_worm (ModeInfo * mi)
 425 {
 426         if (MI_WIN_IS_USE3D(mi))
 427                 /* The 3D code does drawing&clearing by XORing.  We do not
 428                    want to go to too much trouble here to make it redraw
 429                    correctly. */
 430                 XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
 431         else if (worms != NULL) {
 432                 wormstruct *wp = &worms[MI_SCREEN(mi)];
 433                 int         i;
 434
 435                 for (i = 0; i < wp->nw; i++) {
 436                         wp->worm[i].redrawing = 1;
 437                         wp->worm[i].redrawpos = 0;
 438                 }
 439         }
 440 }
 441
 442 XSCREENSAVER_MODULE ("Worm", worm)