git.hungrycats.org Git - xscreensaver/blob - hacks/glx/rubik.c

   1 /* -*- Mode: C; tab-width: 4 -*- */
   2 /* rubik --- Shows a auto-solving Rubik's cube */
   3
   4 #if !defined( lint ) && !defined( SABER )
   5 static const char sccsid[] = "@(#)rubik.c       4.07 97/11/24 xlockmore";
   6
   7 #endif
   8
   9 #undef DEBUG_LISTS
  10 #undef LMN
  11
  12 /*-
  13  * Permission to use, copy, modify, and distribute this software and its
  14  * documentation for any purpose and without fee is hereby granted,
  15  * provided that the above copyright notice appear in all copies and that
  16  * both that copyright notice and this permission notice appear in
  17  * supporting documentation.
  18  *
  19  * This file is provided AS IS with no warranties of any kind.  The author
  20  * shall have no liability with respect to the infringement of copyrights,
  21  * trade secrets or any patents by this file or any part thereof.  In no
  22  * event will the author be liable for any lost revenue or profits or
  23  * other special, indirect and consequential damages.
  24  *
  25  * This mode shows an auto-solving rubik's cube "puzzle". If somebody
  26  * intends to make a game or something based on this code, please let me
  27  * know first, my e-mail address is provided in this comment. Marcelo.
  28  *
  29  * Thanks goes also to Brian Paul for making it possible and inexpensive
  30  * to use OpenGL at home.
  31  *
  32  * Since I'm not a native English speaker, my apologies for any grammatical
  33  * mistake.
  34  *
  35  * My e-mail address is
  36  * m-vianna@usa.net
  37  *
  38  * Marcelo F. Vianna (Jul-31-1997)
  39  *
  40  * Revision History:
  41  * 26-Sep-98: Added some more movement (the cube do not stays in the screen
  42  *            center anymore. Also fixed the scale problem imediatelly after
  43  *            shuffling when the puzzle is solved.
  44  * 08-Aug-97: Now has some internals from xrubik by David Bagley
  45  *            This should make it easier to add features.
  46  * 02-Aug-97: Now behaves more like puzzle.c: first show the cube being
  47  *            shuffled and then being solved. A mode specific option was added:
  48  *            "+/-hideshuffling" to provide the original behavior (in which
  49  *            only the solution is shown).
  50  *            The color labels corners are now rounded.
  51  *            Optimized the cubit() routine using glLists.
  52  * 01-Aug-97: Shuffling now avoids movements that undoes the previous movement
  53  *            and three consecutive identical moves (which is pretty stupid).
  54  *            improved the "cycles" option in replacement of David's hack,
  55  *            now rp->anglestep is a GLfloat, so this option selects the
  56  *            "exact" number of frames that a rotation (movement) takes to
  57  *            complete.
  58  * 30-Jul-97: Initial release, there is no algorithm to solve the puzzle,
  59  *            instead, it randomly shuffle the cube and then make the
  60  *            movements in the reverse order.
  61  *            The mode was written in 1 day (I got sick and had the day off).
  62  *            There was not much to do since I could not leave home... :)
  63  *
  64  */
  65
  66 /*-
  67  * Color labels mapping:
  68  * =====================
  69  *
  70  *                       +------------+
  71  *                       |0-->        |
  72  *                       ||           |
  73  *                       |v           |
  74  *                       |   TOP(0)   |
  75  *                       |            |
  76  *                       |            |
  77  *                       |           8|
  78  *           +-----------+------------+-----------+
  79  *           |0-->       |0-->        |0-->       |
  80  *           ||          ||           ||          |
  81  *           |v          |v           |v          |
  82  *           |  LEFT(1)  |  FRONT(2)  |  RIGHT(3) |
  83  *           |           |            |           |
  84  *           |           |            |           |
  85  *           |          8|           8|          8|
  86  *           +-----------+------------+-----------+
  87  *                       |0-->        |
  88  *                       ||           |
  89  *                       |v           |
  90  *                       |  BOTTOM(4) |  rp->faces[N][X+AVSIZE*Y]=
  91  *                       |            |         rp->cubeLoc[N][X+AVSIZE*Y]=
  92  *                       |            |
  93  *                       |           8|         +---+---+---+
  94  *                       +------------+         |   |   |   |
  95  *                       |0-->        |         | 0 | 1 | 2 |
  96  *                       ||           |         |---+---+---+
  97  *                       |v           |         |  xxxxx(N) |
  98  *                       |   BACK(5)  |         | 3 | 4 | 5 |
  99  *                       |            |         +---+---+---+
 100  *                       |            |         |   |   |  |
 101  *                       |           8|         | 6 | 7 | 8 |
 102  *                       +------------+         +---+---+---+
 103  *
 104  *  Map to 3d
 105  *  FRONT  => X, Y
 106  *  BACK   => X, Y
 107  *  LEFT   => Z, Y
 108  *  RIGHT  => Z, Y
 109  *  TOP    => X, Z
 110  *  BOTTOM => X, Z
 111  */
 112
 113 /*-
 114  * PURIFY 3.0a on SunOS4 reports an unitialized memory read on each of
 115  * the glCallList() functions below when using MesaGL 2.1.  This has
 116  * been fixed in MesaGL 2.2 and later releases.
 117  */
 118
 119 /*-
 120  * due to a Bug/feature in VMS X11/Intrinsic.h has to be placed before xlock.
 121  * otherwise caddr_t is not defined correctly
 122  */
 123 #include <X11/Intrinsic.h>
 124
 125 #ifdef STANDALONE
 126 # define PROGCLASS      "Rubik"
 127 # define HACK_INIT      init_rubik
 128 # define HACK_DRAW      draw_rubik
 129 # define HACK_RESHAPE reshape_rubik
 130 # define rubik_opts     xlockmore_opts
 131 # define DEFAULTS       "*delay: 40000 \n"              \
 132                                         "*count: -30 \n"                \
 133                                         "*showFPS: False \n"    \
 134                                         "*cycles: 5 \n"                 \
 135                                         "*size:  -6 \n"
 136 # include "xlockmore.h"                         /* from the xscreensaver distribution */
 137 #else /* !STANDALONE */
 138 # include "xlock.h"                                     /* from the xlockmore distribution */
 139 # include "vis.h"
 140 #endif /* !STANDALONE */
 141
 142 #ifdef USE_GL
 143
 144 #define DEF_HIDESHUFFLING     "False"
 145
 146 static Bool hideshuffling;
 147
 148 static XrmOptionDescRec opts[] =
 149 {
 150   {"-hideshuffling", ".rubik.hideshuffling", XrmoptionNoArg, (caddr_t) "on"},
 151   {"+hideshuffling", ".rubik.hideshuffling", XrmoptionNoArg, (caddr_t) "off"}
 152 };
 153
 154 static argtype vars[] =
 155 {
 156         {(caddr_t *) & hideshuffling, "hideshuffling", "Hideshuffling", DEF_HIDESHUFFLING, t_Bool}
 157 };
 158
 159 static OptionStruct desc[] =
 160 {
 161         {"-/+hideshuffling", "turn on/off hidden shuffle phase"}
 162 };
 163
 164 ModeSpecOpt rubik_opts =
 165 {sizeof opts / sizeof opts[0], opts, sizeof vars / sizeof vars[0], vars, desc};
 166
 167 #ifdef USE_MODULES
 168 ModStruct   rubik_description =
 169 {"rubik", "init_rubik", "draw_rubik", "release_rubik",
 170  "draw_rubik", "change_rubik", NULL, &rubik_opts,
 171  10000, -30, 5, -6, 4, 1.0, "",
 172  "Shows an auto-solving Rubik's Cube", 0, NULL};
 173
 174 #endif
 175
 176 #define VectMul(X1,Y1,Z1,X2,Y2,Z2) (Y1)*(Z2)-(Z1)*(Y2),(Z1)*(X2)-(X1)*(Z2),(X1)*(Y2)-(Y1)*(X2)
 177 #define sqr(A)                     ((A)*(A))
 178
 179 #ifndef Pi
 180 #define Pi                         M_PI
 181 #endif
 182
 183
 184 #define ACTION_SOLVE    1
 185 #define ACTION_SHUFFLE  0
 186
 187 #define DELAY_AFTER_SHUFFLING  5
 188 #define DELAY_AFTER_SOLVING   20
 189
 190 /*************************************************************************/
 191
 192 #define MINSIZE 2
 193 #ifdef LMN                      /* LxMxN not completed yet... */
 194 #define MAXSIZEX (rp->sizex)
 195 #define MAXSIZEY (rp->sizey)
 196 #define MAXSIZEZ (rp->sizez)
 197 #define AVSIZE (rp->avsize)
 198 #define MAXSIZE (rp->maxsize)
 199 #define AVSIZESQ (rp->avsizeSq)
 200 #define MAXSIZESQ (rp->maxsizeSq)
 201 #else
 202 #define MAXSIZEX (rp->size)
 203 #define MAXSIZEY (rp->size)
 204 #define MAXSIZEZ (rp->size)
 205 #define AVSIZE (rp->size)
 206 #define MAXSIZE (rp->size)
 207 #define AVSIZESQ (rp->sizeSq)
 208 #define MAXSIZESQ (rp->sizeSq)
 209 #endif
 210 #define MAXSIZEXY (MAXSIZEX*MAXSIZEY)
 211 #define MAXSIZEZY (MAXSIZEZ*MAXSIZEY)
 212 #define MAXSIZEXZ (MAXSIZEX*MAXSIZEZ)
 213 #define LASTX (MAXSIZEX-1)
 214 #define LASTY (MAXSIZEY-1)
 215 #define LASTZ (MAXSIZEZ-1)
 216 /* These are not likely to change but... */
 217 #define FIRSTX 0
 218 #define FIRSTY 0
 219 #define FIRSTZ 0
 220
 221 #define Scale4Window               (0.9/AVSIZE)
 222 #define Scale4Iconic               (2.1/AVSIZE)
 223
 224 #define MAXORIENT 4             /* Number of orientations of a square */
 225 #define MAXFACES 6              /* Number of faces */
 226
 227 /* Directions relative to the face of a cubie */
 228 #define TOP 0
 229 #define RIGHT 1
 230 #define BOTTOM 2
 231 #define LEFT 3
 232 #define CW (MAXORIENT+1)
 233 #define CCW (2*MAXORIENT-1)
 234
 235 #define TOP_FACE 0
 236 #define LEFT_FACE 1
 237 #define FRONT_FACE 2
 238 #define RIGHT_FACE 3
 239 #define BOTTOM_FACE 4
 240 #define BACK_FACE 5
 241 #define NO_FACE (MAXFACES)
 242 #define NO_ROTATION (2*MAXORIENT)
 243 #define NO_DEPTH MAXSIZE
 244
 245 #define REVX(a) (MAXSIZEX - a - 1)
 246 #define REVY(a) (MAXSIZEY - a - 1)
 247 #define REVZ(a) (MAXSIZEZ - a - 1)
 248
 249 typedef struct _RubikLoc {
 250         int         face;
 251         int         rotation;   /* Not used yet */
 252 } RubikLoc;
 253
 254 typedef struct _RubikRowNext {
 255         int         face, direction, sideFace;
 256 } RubikRowNext;
 257
 258 typedef struct _RubikMove {
 259         int         face, direction;
 260         int         position;
 261 } RubikMove;
 262
 263 typedef struct _RubikSlice {
 264         int         face, rotation;
 265         int         depth;
 266 } RubikSlice;
 267
 268 /*-
 269  * Pick a face and a direction on face the next face and orientation
 270  * is then known.
 271  */
 272 static RubikLoc slideNextRow[MAXFACES][MAXORIENT] =
 273 {
 274         {
 275                 {5, TOP},
 276                 {3, RIGHT},
 277                 {2, TOP},
 278                 {1, LEFT}},
 279         {
 280                 {0, RIGHT},
 281                 {2, TOP},
 282                 {4, LEFT},
 283                 {5, BOTTOM}},
 284         {
 285                 {0, TOP},
 286                 {3, TOP},
 287                 {4, TOP},
 288                 {1, TOP}},
 289         {
 290                 {0, LEFT},
 291                 {5, BOTTOM},
 292                 {4, RIGHT},
 293                 {2, TOP}},
 294         {
 295                 {2, TOP},
 296                 {3, LEFT},
 297                 {5, TOP},
 298                 {1, RIGHT}},
 299         {
 300                 {4, TOP},
 301                 {3, BOTTOM},
 302                 {0, TOP},
 303                 {1, BOTTOM}}
 304 };
 305
 306 /*-
 307  * Examine cubie 0 on each face, its 4 movements (well only 2 since the
 308  * other 2 will be opposites) and translate it into slice movements).
 309  * Beware.. using this for NxNxN makes some assumptions that referenced
 310  * cubes are along the diagonal top-left to bottom-right.
 311  * CW = DEEP Depth CCW == SHALLOW Depth with reference to faces 0, 1, and 2
 312  */
 313 static RubikLoc rotateSlice[MAXFACES][MAXORIENT / 2] =
 314 {
 315         {
 316                 {1, CCW},
 317                 {2, CW},
 318         },
 319         {
 320                 {2, CW},
 321                 {0, CCW},
 322         },
 323         {
 324                 {1, CCW},
 325                 {0, CCW},
 326         },
 327         {
 328                 {2, CCW},
 329                 {0, CCW},
 330         },
 331         {
 332                 {1, CCW},
 333                 {2, CCW},
 334         },
 335         {
 336                 {1, CCW},
 337                 {0, CW},
 338         }
 339 };
 340
 341 /*-
 342  * Rotate face clockwise by a number of orients, then the top of the
 343  * face then points to this face
 344  */
 345 static int  rowToRotate[MAXFACES][MAXORIENT] =
 346 {
 347         {3, 2, 1, 5},
 348         {2, 4, 5, 0},
 349         {3, 4, 1, 0},
 350         {5, 4, 2, 0},
 351         {3, 5, 1, 2},
 352         {3, 0, 1, 4}
 353 };
 354
 355 /*
 356  * This translates a clockwise move to something more manageable
 357  */
 358 static RubikRowNext rotateToRow[MAXFACES] =     /*CW to min face */
 359 {
 360         {1, LEFT, TOP},
 361         {0, BOTTOM, LEFT},
 362         {0, RIGHT, BOTTOM},
 363         {0, TOP, RIGHT},
 364         {1, RIGHT, BOTTOM},
 365         {0, LEFT, TOP}
 366 };
 367
 368 typedef struct {
 369         GLint       WindH, WindW;
 370         GLfloat     step;
 371         RubikMove  *moves;
 372         int         storedmoves;
 373         int         shufflingmoves;
 374 #ifdef LMN                      /* Under construction */
 375         int         sizex, sizey, sizez;
 376         int         avsize, maxsize;
 377         int         avsizeSq, maxsizeSq;
 378 #else
 379         int         size, sizeSq;
 380 #endif
 381         int         action;
 382         int         done;
 383         GLfloat     anglestep;
 384         RubikLoc   *cubeLoc[MAXFACES];
 385         RubikLoc   *rowLoc[MAXORIENT];
 386         RubikMove   movement;
 387         GLfloat     rotatestep;
 388         GLXContext *glx_context;
 389         int         AreObjectsDefined[1];
 390 } rubikstruct;
 391
 392 static float front_shininess[] =
 393 {60.0};
 394 static float front_specular[] =
 395 {0.7, 0.7, 0.7, 1.0};
 396 static float ambient[] =
 397 {0.0, 0.0, 0.0, 1.0};
 398 static float diffuse[] =
 399 {1.0, 1.0, 1.0, 1.0};
 400 static float position0[] =
 401 {1.0, 1.0, 1.0, 0.0};
 402 static float position1[] =
 403 {-1.0, -1.0, 1.0, 0.0};
 404 static float lmodel_ambient[] =
 405 {0.5, 0.5, 0.5, 1.0};
 406 static float lmodel_twoside[] =
 407 {GL_TRUE};
 408
 409 static float MaterialRed[] =
 410 {0.5, 0.0, 0.0, 1.0};
 411 static float MaterialGreen[] =
 412 {0.0, 0.5, 0.0, 1.0};
 413 static float MaterialBlue[] =
 414 {0.0, 0.0, 0.5, 1.0};
 415 static float MaterialYellow[] =
 416 {0.7, 0.7, 0.0, 1.0};
 417 static float MaterialOrange[] =
 418 {0.9, 0.45, 0.36, 1.0};
 419
 420 #if 0
 421 static float MaterialMagenta[] =
 422 {0.7, 0.0, 0.7, 1.0};
 423 static float MaterialCyan[] =
 424 {0.0, 0.7, 0.7, 1.0};
 425
 426 #endif
 427 static float MaterialWhite[] =
 428 {0.8, 0.8, 0.8, 1.0};
 429 static float MaterialGray[] =
 430 {0.2, 0.2, 0.2, 1.0};
 431 static float MaterialGray3[] =
 432 {0.3, 0.3, 0.3, 1.0};
 433 static float MaterialGray4[] =
 434 {0.4, 0.4, 0.4, 1.0};
 435 static float MaterialGray5[] =
 436 {0.5, 0.5, 0.5, 1.0};
 437 static float MaterialGray6[] =
 438 {0.6, 0.6, 0.6, 1.0};
 439 static float MaterialGray7[] =
 440 {0.7, 0.7, 0.7, 1.0};
 441
 442 static rubikstruct *rubik = NULL;
 443 static GLuint objects;
 444
 445 #define ObjCubit        0
 446
 447 static void
 448 pickcolor(int C, int mono)
 449 {
 450         switch (C) {
 451                 case TOP_FACE:
 452                         if (mono)
 453                                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray3);
 454                         else
 455                                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialRed);
 456                         break;
 457                 case LEFT_FACE:
 458                         if (mono)
 459                                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray6);
 460                         else
 461                                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialYellow);
 462                         break;
 463                 case FRONT_FACE:
 464                         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialWhite);
 465                         break;
 466                 case RIGHT_FACE:
 467                         if (mono)
 468                                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray4);
 469                         else
 470                                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGreen);
 471                         break;
 472                 case BOTTOM_FACE:
 473                         if (mono)
 474                                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray7);
 475                         else
 476                                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialOrange);
 477                         break;
 478                 case BACK_FACE:
 479                         if (mono)
 480                                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray5);
 481                         else
 482                                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialBlue);
 483                         break;
 484 #if 0
 485                         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialCyan);
 486                         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialMagenta);
 487 #endif
 488         }
 489 }
 490
 491
 492 static void
 493 draw_cubit(ModeInfo * mi,
 494            int back, int front, int left, int right, int bottom, int top)
 495 {
 496         rubikstruct *rp = &rubik[MI_SCREEN(mi)];
 497         int         mono = MI_IS_MONO(mi);
 498
 499         if (!rp->AreObjectsDefined[ObjCubit]) {
 500                 glNewList(objects + ObjCubit, GL_COMPILE_AND_EXECUTE);
 501                 glBegin(GL_QUADS);
 502                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray);
 503                 glNormal3f(0.00, 0.00, 1.00);
 504                 glVertex3f(-0.45, -0.45, 0.50);
 505                 glVertex3f(0.45, -0.45, 0.50);
 506                 glVertex3f(0.45, 0.45, 0.50);
 507                 glVertex3f(-0.45, 0.45, 0.50);
 508                 glNormal3f(0.00, 0.00, -1.00);
 509                 glVertex3f(-0.45, 0.45, -0.50);
 510                 glVertex3f(0.45, 0.45, -0.50);
 511                 glVertex3f(0.45, -0.45, -0.50);
 512                 glVertex3f(-0.45, -0.45, -0.50);
 513                 glNormal3f(-1.00, 0.00, 0.00);
 514                 glVertex3f(-0.50, -0.45, 0.45);
 515                 glVertex3f(-0.50, 0.45, 0.45);
 516                 glVertex3f(-0.50, 0.45, -0.45);
 517                 glVertex3f(-0.50, -0.45, -0.45);
 518                 glNormal3f(1.00, 0.00, 0.00);
 519                 glVertex3f(0.50, -0.45, -0.45);
 520                 glVertex3f(0.50, 0.45, -0.45);
 521                 glVertex3f(0.50, 0.45, 0.45);
 522                 glVertex3f(0.50, -0.45, 0.45);
 523                 glNormal3f(0.00, -1.00, 0.00);
 524                 glVertex3f(0.45, -0.50, -0.45);
 525                 glVertex3f(0.45, -0.50, 0.45);
 526                 glVertex3f(-0.45, -0.50, 0.45);
 527                 glVertex3f(-0.45, -0.50, -0.45);
 528                 glNormal3f(0.00, 1.00, 0.00);
 529                 glVertex3f(-0.45, 0.50, -0.45);
 530                 glVertex3f(-0.45, 0.50, 0.45);
 531                 glVertex3f(0.45, 0.50, 0.45);
 532                 glVertex3f(0.45, 0.50, -0.45);
 533                 glNormal3f(-1.00, -1.00, 0.00);
 534                 glVertex3f(-0.45, -0.50, -0.45);
 535                 glVertex3f(-0.45, -0.50, 0.45);
 536                 glVertex3f(-0.50, -0.45, 0.45);
 537                 glVertex3f(-0.50, -0.45, -0.45);
 538                 glNormal3f(1.00, 1.00, 0.00);
 539                 glVertex3f(0.45, 0.50, -0.45);
 540                 glVertex3f(0.45, 0.50, 0.45);
 541                 glVertex3f(0.50, 0.45, 0.45);
 542                 glVertex3f(0.50, 0.45, -0.45);
 543                 glNormal3f(-1.00, 1.00, 0.00);
 544                 glVertex3f(-0.50, 0.45, -0.45);
 545                 glVertex3f(-0.50, 0.45, 0.45);
 546                 glVertex3f(-0.45, 0.50, 0.45);
 547                 glVertex3f(-0.45, 0.50, -0.45);
 548                 glNormal3f(1.00, -1.00, 0.00);
 549                 glVertex3f(0.50, -0.45, -0.45);
 550                 glVertex3f(0.50, -0.45, 0.45);
 551                 glVertex3f(0.45, -0.50, 0.45);
 552                 glVertex3f(0.45, -0.50, -0.45);
 553                 glNormal3f(0.00, -1.00, -1.00);
 554                 glVertex3f(-0.45, -0.45, -0.50);
 555                 glVertex3f(0.45, -0.45, -0.50);
 556                 glVertex3f(0.45, -0.50, -0.45);
 557                 glVertex3f(-0.45, -0.50, -0.45);
 558                 glNormal3f(0.00, 1.00, 1.00);
 559                 glVertex3f(-0.45, 0.45, 0.50);
 560                 glVertex3f(0.45, 0.45, 0.50);
 561                 glVertex3f(0.45, 0.50, 0.45);
 562                 glVertex3f(-0.45, 0.50, 0.45);
 563                 glNormal3f(0.00, -1.00, 1.00);
 564                 glVertex3f(-0.45, -0.50, 0.45);
 565                 glVertex3f(0.45, -0.50, 0.45);
 566                 glVertex3f(0.45, -0.45, 0.50);
 567                 glVertex3f(-0.45, -0.45, 0.50);
 568                 glNormal3f(0.00, 1.00, -1.00);
 569                 glVertex3f(-0.45, 0.50, -0.45);
 570                 glVertex3f(0.45, 0.50, -0.45);
 571                 glVertex3f(0.45, 0.45, -0.50);
 572                 glVertex3f(-0.45, 0.45, -0.50);
 573                 glNormal3f(-1.00, 0.00, -1.00);
 574                 glVertex3f(-0.50, -0.45, -0.45);
 575                 glVertex3f(-0.50, 0.45, -0.45);
 576                 glVertex3f(-0.45, 0.45, -0.50);
 577                 glVertex3f(-0.45, -0.45, -0.50);
 578                 glNormal3f(1.00, 0.00, 1.00);
 579                 glVertex3f(0.50, -0.45, 0.45);
 580                 glVertex3f(0.50, 0.45, 0.45);
 581                 glVertex3f(0.45, 0.45, 0.50);
 582                 glVertex3f(0.45, -0.45, 0.50);
 583                 glNormal3f(1.00, 0.00, -1.00);
 584                 glVertex3f(0.45, -0.45, -0.50);
 585                 glVertex3f(0.45, 0.45, -0.50);
 586                 glVertex3f(0.50, 0.45, -0.45);
 587                 glVertex3f(0.50, -0.45, -0.45);
 588                 glNormal3f(-1.00, 0.00, 1.00);
 589                 glVertex3f(-0.45, -0.45, 0.50);
 590                 glVertex3f(-0.45, 0.45, 0.50);
 591                 glVertex3f(-0.50, 0.45, 0.45);
 592                 glVertex3f(-0.50, -0.45, 0.45);
 593                 glEnd();
 594                 glBegin(GL_TRIANGLES);
 595                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray);
 596                 glNormal3f(1.00, 1.00, 1.00);
 597                 glVertex3f(0.45, 0.45, 0.50);
 598                 glVertex3f(0.50, 0.45, 0.45);
 599                 glVertex3f(0.45, 0.50, 0.45);
 600                 glNormal3f(-1.00, -1.00, -1.00);
 601                 glVertex3f(-0.45, -0.50, -0.45);
 602                 glVertex3f(-0.50, -0.45, -0.45);
 603                 glVertex3f(-0.45, -0.45, -0.50);
 604                 glNormal3f(-1.00, 1.00, 1.00);
 605                 glVertex3f(-0.45, 0.45, 0.50);
 606                 glVertex3f(-0.45, 0.50, 0.45);
 607                 glVertex3f(-0.50, 0.45, 0.45);
 608                 glNormal3f(1.00, -1.00, -1.00);
 609                 glVertex3f(0.50, -0.45, -0.45);
 610                 glVertex3f(0.45, -0.50, -0.45);
 611                 glVertex3f(0.45, -0.45, -0.50);
 612                 glNormal3f(1.00, -1.00, 1.00);
 613                 glVertex3f(0.45, -0.45, 0.50);
 614                 glVertex3f(0.45, -0.50, 0.45);
 615                 glVertex3f(0.50, -0.45, 0.45);
 616                 glNormal3f(-1.00, 1.00, -1.00);
 617                 glVertex3f(-0.50, 0.45, -0.45);
 618                 glVertex3f(-0.45, 0.50, -0.45);
 619                 glVertex3f(-0.45, 0.45, -0.50);
 620                 glNormal3f(-1.00, -1.00, 1.00);
 621                 glVertex3f(-0.45, -0.45, 0.50);
 622                 glVertex3f(-0.50, -0.45, 0.45);
 623                 glVertex3f(-0.45, -0.50, 0.45);
 624                 glNormal3f(1.00, 1.00, -1.00);
 625                 glVertex3f(0.50, 0.45, -0.45);
 626                 glVertex3f(0.45, 0.45, -0.50);
 627                 glVertex3f(0.45, 0.50, -0.45);
 628                 glEnd();
 629                 glEndList();
 630                 rp->AreObjectsDefined[ObjCubit] = 1;
 631 #ifdef DEBUG_LISTS
 632                 (void) printf("Cubit drawn SLOWLY\n");
 633 #endif
 634         } else {
 635                 glCallList(objects + ObjCubit);
 636 #ifdef DEBUG_LISTS
 637                 (void) printf("Cubit drawn quickly\n");
 638 #endif
 639         }
 640
 641         if (back != NO_FACE) {
 642                 glBegin(GL_POLYGON);
 643                 pickcolor(back, mono);
 644                 glNormal3f(0.00, 0.00, -1.00);
 645                 glVertex3f(-0.35, 0.40, -0.51);
 646                 glVertex3f(0.35, 0.40, -0.51);
 647                 glVertex3f(0.40, 0.35, -0.51);
 648                 glVertex3f(0.40, -0.35, -0.51);
 649                 glVertex3f(0.35, -0.40, -0.51);
 650                 glVertex3f(-0.35, -0.40, -0.51);
 651                 glVertex3f(-0.40, -0.35, -0.51);
 652                 glVertex3f(-0.40, 0.35, -0.51);
 653                 glEnd();
 654         }
 655         if (front != NO_FACE) {
 656                 glBegin(GL_POLYGON);
 657                 pickcolor(front, mono);
 658                 glNormal3f(0.00, 0.00, 1.00);
 659                 glVertex3f(-0.35, -0.40, 0.51);
 660                 glVertex3f(0.35, -0.40, 0.51);
 661                 glVertex3f(0.40, -0.35, 0.51);
 662                 glVertex3f(0.40, 0.35, 0.51);
 663                 glVertex3f(0.35, 0.40, 0.51);
 664                 glVertex3f(-0.35, 0.40, 0.51);
 665                 glVertex3f(-0.40, 0.35, 0.51);
 666                 glVertex3f(-0.40, -0.35, 0.51);
 667                 glEnd();
 668         }
 669         if (left != NO_FACE) {
 670                 glBegin(GL_POLYGON);
 671                 pickcolor(left, mono);
 672                 glNormal3f(-1.00, 0.00, 0.00);
 673                 glVertex3f(-0.51, -0.35, 0.40);
 674                 glVertex3f(-0.51, 0.35, 0.40);
 675                 glVertex3f(-0.51, 0.40, 0.35);
 676                 glVertex3f(-0.51, 0.40, -0.35);
 677                 glVertex3f(-0.51, 0.35, -0.40);
 678                 glVertex3f(-0.51, -0.35, -0.40);
 679                 glVertex3f(-0.51, -0.40, -0.35);
 680                 glVertex3f(-0.51, -0.40, 0.35);
 681                 glEnd();
 682         }
 683         if (right != NO_FACE) {
 684                 glBegin(GL_POLYGON);
 685                 pickcolor(right, mono);
 686                 glNormal3f(1.00, 0.00, 0.00);
 687                 glVertex3f(0.51, -0.35, -0.40);
 688                 glVertex3f(0.51, 0.35, -0.40);
 689                 glVertex3f(0.51, 0.40, -0.35);
 690                 glVertex3f(0.51, 0.40, 0.35);
 691                 glVertex3f(0.51, 0.35, 0.40);
 692                 glVertex3f(0.51, -0.35, 0.40);
 693                 glVertex3f(0.51, -0.40, 0.35);
 694                 glVertex3f(0.51, -0.40, -0.35);
 695                 glEnd();
 696         }
 697         if (bottom != NO_FACE) {
 698                 glBegin(GL_POLYGON);
 699                 pickcolor(bottom, mono);
 700                 glNormal3f(0.00, -1.00, 0.00);
 701                 glVertex3f(0.40, -0.51, -0.35);
 702                 glVertex3f(0.40, -0.51, 0.35);
 703                 glVertex3f(0.35, -0.51, 0.40);
 704                 glVertex3f(-0.35, -0.51, 0.40);
 705                 glVertex3f(-0.40, -0.51, 0.35);
 706                 glVertex3f(-0.40, -0.51, -0.35);
 707                 glVertex3f(-0.35, -0.51, -0.40);
 708                 glVertex3f(0.35, -0.51, -0.40);
 709                 glEnd();
 710         }
 711         if (top != NO_FACE) {
 712                 glBegin(GL_POLYGON);
 713                 pickcolor(top, mono);
 714                 glNormal3f(0.00, 1.00, 0.00);
 715                 glVertex3f(-0.40, 0.51, -0.35);
 716                 glVertex3f(-0.40, 0.51, 0.35);
 717                 glVertex3f(-0.35, 0.51, 0.40);
 718                 glVertex3f(0.35, 0.51, 0.40);
 719                 glVertex3f(0.40, 0.51, 0.35);
 720                 glVertex3f(0.40, 0.51, -0.35);
 721                 glVertex3f(0.35, 0.51, -0.40);
 722                 glVertex3f(-0.35, 0.51, -0.40);
 723                 glEnd();
 724         }
 725 }
 726
 727
 728 static      RubikSlice
 729 convertMove(rubikstruct * rp, RubikMove move)
 730 {
 731         RubikSlice  slice;
 732         RubikLoc    plane;
 733
 734         plane = rotateSlice[(int) move.face][move.direction % 2];
 735         slice.face = plane.face;
 736         slice.rotation = plane.rotation;
 737         if (slice.rotation == CW)       /* I just know this to be true... */
 738                 slice.depth = AVSIZESQ - 1 - move.position;
 739         else
 740                 slice.depth = move.position;
 741         slice.depth = slice.depth / AVSIZE;
 742         /* If slice.depth = 0 then face 0, face 1, or face 2 moves */
 743         if (move.direction / 2)
 744                 slice.rotation = (plane.rotation == CW) ? CCW : CW;
 745         return slice;
 746 }
 747
 748 /* Assume for the moment that the size is at least 2 */
 749 static void
 750 draw_cube(ModeInfo * mi)
 751 {
 752 #define S1 1
 753 #define SX ((GLint)S1*(MAXSIZEX-1))
 754 #define SY ((GLint)S1*(MAXSIZEY-1))
 755 #define SZ ((GLint)S1*(MAXSIZEZ-1))
 756 #define HALFX (((GLfloat)MAXSIZEX-1.0)/2.0)
 757 #define HALFY (((GLfloat)MAXSIZEY-1.0)/2.0)
 758 #define HALFZ (((GLfloat)MAXSIZEZ-1.0)/2.0)
 759 #define MIDX(a) (((GLfloat)(2*a-MAXSIZEX+1))/2.0)
 760 #define MIDY(a) (((GLfloat)(2*a-MAXSIZEY+1))/2.0)
 761 #define MIDZ(a) (((GLfloat)(2*a-MAXSIZEZ+1))/2.0)
 762         rubikstruct *rp = &rubik[MI_SCREEN(mi)];
 763         RubikSlice  slice;
 764         GLfloat     rotatestep;
 765         int         i, j, k;
 766
 767         if (rp->movement.face == NO_FACE) {
 768                 slice.face = NO_FACE;
 769                 slice.rotation = NO_ROTATION;
 770                 slice.depth = NO_DEPTH;
 771         } else {
 772                 slice = convertMove(rp, rp->movement);
 773         }
 774         rotatestep = (slice.rotation == CCW) ? rp->rotatestep : -rp->rotatestep;
 775
 776 /*-
 777  * The glRotatef() routine transforms the coordinate system for every future
 778  * vertex specification (this is not so simple, but by now comprehending this
 779  * is sufficient). So if you want to rotate the inner slice, you can draw
 780  * one slice, rotate the anglestep for the centerslice, draw the inner slice,
 781  * rotate reversely and draw the other slice.
 782  * There is a sequence for drawing cubies for each axis being moved...
 783  */
 784         switch (slice.face) {
 785                 case NO_FACE:
 786                 case TOP_FACE:  /* BOTTOM_FACE too */
 787                         glPushMatrix();
 788                         if (slice.depth == MAXSIZEY - 1)
 789                                 glRotatef(rotatestep, 0, HALFY, 0);
 790
 791                         glTranslatef(-HALFX, -HALFY, -HALFZ);
 792                         draw_cubit(mi,
 793                                    rp->cubeLoc[BACK_FACE][FIRSTX + MAXSIZEX * FIRSTY].face, NO_FACE,
 794                                    rp->cubeLoc[LEFT_FACE][FIRSTZ + MAXSIZEZ * LASTY].face, NO_FACE,
 795                                    rp->cubeLoc[BOTTOM_FACE][FIRSTX + MAXSIZEX * LASTZ].face, NO_FACE);
 796                         for (k = 1; k < MAXSIZEZ - 1; k++) {
 797                                 glTranslatef(0, 0, S1);
 798                                 draw_cubit(mi,
 799                                            NO_FACE, NO_FACE,
 800                                            rp->cubeLoc[LEFT_FACE][k + MAXSIZEZ * LASTY].face, NO_FACE,
 801                                            rp->cubeLoc[BOTTOM_FACE][FIRSTX + MAXSIZEX * REVZ(k)].face, NO_FACE);
 802                         }
 803                         glTranslatef(0, 0, S1);
 804                         draw_cubit(mi,
 805                                    NO_FACE, rp->cubeLoc[FRONT_FACE][FIRSTX + MAXSIZEX * LASTY].face,
 806                                    rp->cubeLoc[LEFT_FACE][LASTZ + MAXSIZEZ * LASTY].face, NO_FACE,
 807                                    rp->cubeLoc[BOTTOM_FACE][FIRSTX + MAXSIZEX * FIRSTZ].face, NO_FACE);
 808                         for (i = 1; i < MAXSIZEX - 1; i++) {
 809                                 glTranslatef(S1, 0, -SZ);
 810                                 draw_cubit(mi,
 811                                            rp->cubeLoc[BACK_FACE][i + MAXSIZEX * FIRSTY].face, NO_FACE,
 812                                            NO_FACE, NO_FACE,
 813                                            rp->cubeLoc[BOTTOM_FACE][i + MAXSIZEX * LASTZ].face, NO_FACE);
 814                                 for (k = 1; k < MAXSIZEZ - 1; k++) {
 815                                         glTranslatef(0, 0, S1);
 816                                         draw_cubit(mi,
 817                                                    NO_FACE, NO_FACE,
 818                                                    NO_FACE, NO_FACE,
 819                                                    rp->cubeLoc[BOTTOM_FACE][i + MAXSIZEX * REVZ(k)].face, NO_FACE);
 820                                 }
 821                                 glTranslatef(0, 0, S1);
 822                                 draw_cubit(mi,
 823                                            NO_FACE, rp->cubeLoc[FRONT_FACE][i + MAXSIZEX * LASTY].face,
 824                                            NO_FACE, NO_FACE,
 825                                            rp->cubeLoc[BOTTOM_FACE][i + MAXSIZEX * FIRSTZ].face, NO_FACE);
 826                         }
 827                         glTranslatef(1, 0, -SZ);
 828                         draw_cubit(mi,
 829                                    rp->cubeLoc[BACK_FACE][LASTX + MAXSIZEX * FIRSTY].face, NO_FACE,
 830                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][LASTZ + MAXSIZEZ * LASTY].face,
 831                                    rp->cubeLoc[BOTTOM_FACE][LASTX + MAXSIZEX * LASTZ].face, NO_FACE);
 832                         for (k = 1; k < MAXSIZEZ - 1; k++) {
 833                                 glTranslatef(0, 0, S1);
 834                                 draw_cubit(mi,
 835                                            NO_FACE, NO_FACE,
 836                                            NO_FACE, rp->cubeLoc[RIGHT_FACE][REVZ(k) + MAXSIZEZ * LASTY].face,
 837                                            rp->cubeLoc[BOTTOM_FACE][LASTX + MAXSIZEX * REVZ(k)].face, NO_FACE);
 838                         }
 839                         glTranslatef(0, 0, S1);
 840                         draw_cubit(mi,
 841                                    NO_FACE, rp->cubeLoc[FRONT_FACE][LASTX + MAXSIZEX * LASTY].face,
 842                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][FIRSTZ + MAXSIZEZ * LASTY].face,
 843                                    rp->cubeLoc[BOTTOM_FACE][LASTX + MAXSIZEX * FIRSTZ].face, NO_FACE);
 844                         glPopMatrix();
 845                         for (j = 1; j < MAXSIZEY - 1; j++) {
 846                                 glPushMatrix();
 847                                 if (slice.depth == REVY(j))
 848                                         glRotatef(rotatestep, 0, HALFY, 0);
 849                                 glTranslatef(-HALFX, MIDY(j), -HALFZ);
 850                                 draw_cubit(mi,
 851                                            rp->cubeLoc[BACK_FACE][FIRSTX + MAXSIZEX * j].face, NO_FACE,
 852                                            rp->cubeLoc[LEFT_FACE][FIRSTZ + MAXSIZEZ * REVY(j)].face, NO_FACE,
 853                                            NO_FACE, NO_FACE);
 854                                 for (k = 1; k < MAXSIZEZ - 1; k++) {
 855                                         glTranslatef(0, 0, S1);
 856                                         draw_cubit(mi,
 857                                                    NO_FACE, NO_FACE,
 858                                                    rp->cubeLoc[LEFT_FACE][k + MAXSIZEZ * REVY(j)].face, NO_FACE,
 859                                                    NO_FACE, NO_FACE);
 860                                 }
 861                                 glTranslatef(0, 0, S1);
 862                                 draw_cubit(mi,
 863                                            NO_FACE, rp->cubeLoc[FRONT_FACE][FIRSTX + MAXSIZEX * REVY(j)].face,
 864                                            rp->cubeLoc[LEFT_FACE][LASTZ + MAXSIZEZ * REVY(j)].face, NO_FACE,
 865                                            NO_FACE, NO_FACE);
 866                                 for (i = 1; i < MAXSIZEX - 1; i++) {
 867                                         glTranslatef(1, 0, -SZ);
 868                                         draw_cubit(mi,
 869                                                    rp->cubeLoc[BACK_FACE][i + MAXSIZEX * j].face, NO_FACE,
 870                                                    NO_FACE, NO_FACE,
 871                                                    NO_FACE, NO_FACE);
 872                                         /* Center */
 873                                         glTranslatef(0, 0, SZ);
 874                                         draw_cubit(mi,
 875                                                    NO_FACE, rp->cubeLoc[FRONT_FACE][i + MAXSIZEX * REVY(j)].face,
 876                                                    NO_FACE, NO_FACE,
 877                                                    NO_FACE, NO_FACE);
 878                                 }
 879                                 glTranslatef(S1, 0, -SZ);
 880                                 draw_cubit(mi,
 881                                            rp->cubeLoc[BACK_FACE][LASTX + MAXSIZEX * j].face, NO_FACE,
 882                                            NO_FACE, rp->cubeLoc[RIGHT_FACE][LASTZ + MAXSIZEZ * REVY(j)].face,
 883                                            NO_FACE, NO_FACE);
 884                                 for (k = 1; k < MAXSIZEZ - 1; k++) {
 885                                         glTranslatef(0, 0, S1);
 886                                         draw_cubit(mi,
 887                                                    NO_FACE, NO_FACE,
 888                                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][REVZ(k) + MAXSIZEZ * REVY(j)].face,
 889                                                    NO_FACE, NO_FACE);
 890                                 }
 891                                 glTranslatef(0, 0, S1);
 892                                 draw_cubit(mi,
 893                                            NO_FACE, rp->cubeLoc[FRONT_FACE][LASTX + MAXSIZEX * REVY(j)].face,
 894                                            NO_FACE, rp->cubeLoc[RIGHT_FACE][FIRSTZ + MAXSIZEZ * REVY(j)].face,
 895                                            NO_FACE, NO_FACE);
 896                                 glPopMatrix();
 897                         }
 898                         if (slice.depth == 0)
 899                                 glRotatef(rotatestep, 0, HALFY, 0);
 900
 901                         glTranslatef(-HALFX, HALFY, -HALFZ);
 902                         draw_cubit(mi,
 903                                    rp->cubeLoc[BACK_FACE][FIRSTX + MAXSIZEX * LASTY].face, NO_FACE,
 904                                    rp->cubeLoc[LEFT_FACE][FIRSTZ + MAXSIZEZ * FIRSTY].face, NO_FACE,
 905                                    NO_FACE, rp->cubeLoc[TOP_FACE][FIRSTX + MAXSIZEX * FIRSTZ].face);
 906                         for (k = 1; k < MAXSIZEZ - 1; k++) {
 907                                 glTranslatef(0, 0, S1);
 908                                 draw_cubit(mi,
 909                                            NO_FACE, NO_FACE,
 910                                            rp->cubeLoc[LEFT_FACE][k + MAXSIZEZ * FIRSTY].face, NO_FACE,
 911                                            NO_FACE, rp->cubeLoc[TOP_FACE][FIRSTX + MAXSIZEX * k].face);
 912                         }
 913                         glTranslatef(0, 0, S1);
 914                         draw_cubit(mi,
 915                                    NO_FACE, rp->cubeLoc[FRONT_FACE][FIRSTX + MAXSIZEX * FIRSTY].face,
 916                                    rp->cubeLoc[LEFT_FACE][LASTZ + MAXSIZEZ * FIRSTY].face, NO_FACE,
 917                                    NO_FACE, rp->cubeLoc[TOP_FACE][FIRSTX + MAXSIZEX * LASTZ].face);
 918                         for (i = 1; i < MAXSIZEX - 1; i++) {
 919                                 glTranslatef(S1, 0, -SZ);
 920                                 draw_cubit(mi,
 921                                            rp->cubeLoc[BACK_FACE][i + MAXSIZEX * LASTY].face, NO_FACE,
 922                                            NO_FACE, NO_FACE,
 923                                            NO_FACE, rp->cubeLoc[TOP_FACE][i + MAXSIZEX * FIRSTZ].face);
 924                                 for (k = 1; k < MAXSIZEZ - 1; k++) {
 925                                         glTranslatef(0, 0, S1);
 926                                         draw_cubit(mi,
 927                                                    NO_FACE, NO_FACE,
 928                                                    NO_FACE, NO_FACE,
 929                                                    NO_FACE, rp->cubeLoc[TOP_FACE][i + MAXSIZEX * k].face);
 930                                 }
 931                                 glTranslatef(0, 0, S1);
 932                                 draw_cubit(mi,
 933                                            NO_FACE, rp->cubeLoc[FRONT_FACE][i + MAXSIZEX * FIRSTY].face,
 934                                            NO_FACE, NO_FACE,
 935                                            NO_FACE, rp->cubeLoc[TOP_FACE][i + MAXSIZEX * LASTZ].face);
 936                         }
 937                         glTranslatef(S1, 0, -SZ);
 938                         draw_cubit(mi,
 939                                    rp->cubeLoc[BACK_FACE][LASTX + MAXSIZEX * LASTY].face, NO_FACE,
 940                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][LASTZ + MAXSIZEZ * FIRSTY].face,
 941                                    NO_FACE, rp->cubeLoc[TOP_FACE][LASTX + MAXSIZEX * FIRSTZ].face);
 942                         for (k = 1; k < MAXSIZEZ - 1; k++) {
 943                                 glTranslatef(0, 0, S1);
 944                                 draw_cubit(mi,
 945                                            NO_FACE, NO_FACE,
 946                                            NO_FACE, rp->cubeLoc[RIGHT_FACE][REVZ(k) + MAXSIZEZ * FIRSTY].face,
 947                                            NO_FACE, rp->cubeLoc[TOP_FACE][LASTX + MAXSIZEX * k].face);
 948                         }
 949                         glTranslatef(0, 0, S1);
 950                         draw_cubit(mi,
 951                                    NO_FACE, rp->cubeLoc[FRONT_FACE][LASTX + MAXSIZEX * FIRSTY].face,
 952                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][FIRSTZ + MAXSIZEZ * FIRSTY].face,
 953                                    NO_FACE, rp->cubeLoc[TOP_FACE][LASTX + MAXSIZEX * LASTZ].face);
 954                         break;
 955                 case LEFT_FACE: /* RIGHT_FACE too */
 956                         /* rotatestep is negative because the RIGHT face is the default here */
 957                         glPushMatrix();
 958                         if (slice.depth == 0)
 959                                 glRotatef(-rotatestep, HALFX, 0, 0);
 960
 961                         glTranslatef(-HALFX, -HALFY, -HALFZ);
 962                         draw_cubit(mi,
 963                                    rp->cubeLoc[BACK_FACE][FIRSTX + MAXSIZEX * FIRSTY].face, NO_FACE,
 964                                    rp->cubeLoc[LEFT_FACE][FIRSTZ + MAXSIZEZ * LASTY].face, NO_FACE,
 965                                    rp->cubeLoc[BOTTOM_FACE][FIRSTX + MAXSIZEX * LASTZ].face, NO_FACE);
 966                         for (j = 1; j < MAXSIZEY - 1; j++) {
 967                                 glTranslatef(0, S1, 0);
 968                                 draw_cubit(mi,
 969                                            rp->cubeLoc[BACK_FACE][FIRSTX + MAXSIZEX * j].face, NO_FACE,
 970                                            rp->cubeLoc[LEFT_FACE][FIRSTZ + MAXSIZEZ * REVY(j)].face, NO_FACE,
 971                                            NO_FACE, NO_FACE);
 972                         }
 973                         glTranslatef(0, S1, 0);
 974                         draw_cubit(mi,
 975                                    rp->cubeLoc[BACK_FACE][FIRSTX + MAXSIZEX * LASTY].face, NO_FACE,
 976                                    rp->cubeLoc[LEFT_FACE][FIRSTZ + MAXSIZEZ * FIRSTY].face, NO_FACE,
 977                                    NO_FACE, rp->cubeLoc[TOP_FACE][FIRSTX + MAXSIZEX * FIRSTZ].face);
 978                         for (k = 1; k < MAXSIZEZ - 1; k++) {
 979                                 glTranslatef(0, -SY, S1);
 980                                 draw_cubit(mi,
 981                                            NO_FACE, NO_FACE,
 982                                            rp->cubeLoc[LEFT_FACE][k + MAXSIZEZ * LASTY].face, NO_FACE,
 983                                            rp->cubeLoc[BOTTOM_FACE][FIRSTX + MAXSIZEX * REVZ(k)].face, NO_FACE);
 984                                 for (j = 1; j < MAXSIZEY - 1; j++) {
 985                                         glTranslatef(0, S1, 0);
 986                                         draw_cubit(mi,
 987                                                    NO_FACE, NO_FACE,
 988                                                    rp->cubeLoc[LEFT_FACE][k + MAXSIZEZ * REVY(j)].face, NO_FACE,
 989                                                    NO_FACE, NO_FACE);
 990                                 }
 991                                 glTranslatef(0, S1, 0);
 992                                 draw_cubit(mi,
 993                                            NO_FACE, NO_FACE,
 994                                            rp->cubeLoc[LEFT_FACE][k + MAXSIZEZ * FIRSTY].face, NO_FACE,
 995                                            NO_FACE, rp->cubeLoc[TOP_FACE][FIRSTX + MAXSIZEX * k].face);
 996                         }
 997                         glTranslatef(0, -SY, S1);
 998                         draw_cubit(mi,
 999                                    NO_FACE, rp->cubeLoc[FRONT_FACE][FIRSTX + MAXSIZEX * LASTY].face,
1000                                    rp->cubeLoc[LEFT_FACE][LASTZ + MAXSIZEZ * LASTY].face, NO_FACE,
1001                                    rp->cubeLoc[BOTTOM_FACE][FIRSTX + MAXSIZEX * FIRSTZ].face, NO_FACE);
1002                         for (j = 1; j < MAXSIZEY - 1; j++) {
1003                                 glTranslatef(0, S1, 0);
1004                                 draw_cubit(mi,
1005                                            NO_FACE, rp->cubeLoc[FRONT_FACE][FIRSTX + MAXSIZEX * REVY(j)].face,
1006                                            rp->cubeLoc[LEFT_FACE][LASTZ + MAXSIZEZ * REVY(j)].face, NO_FACE,
1007                                            NO_FACE, NO_FACE);
1008                         }
1009                         glTranslatef(0, S1, 0);
1010                         draw_cubit(mi,
1011                                    NO_FACE, rp->cubeLoc[FRONT_FACE][FIRSTX + MAXSIZEX * FIRSTY].face,
1012                                    rp->cubeLoc[LEFT_FACE][LASTZ + MAXSIZEZ * FIRSTY].face, NO_FACE,
1013                                    NO_FACE, rp->cubeLoc[TOP_FACE][FIRSTX + MAXSIZEX * LASTZ].face);
1014                         glPopMatrix();
1015                         for (i = 1; i < MAXSIZEX - 1; i++) {
1016                                 glPushMatrix();
1017                                 if (slice.depth == i)
1018                                         glRotatef(-rotatestep, HALFX, 0, 0);
1019                                 glTranslatef(MIDX(i), -HALFY, -HALFZ);
1020                                 draw_cubit(mi,
1021                                            rp->cubeLoc[BACK_FACE][i + MAXSIZEX * FIRSTY].face, NO_FACE,
1022                                            NO_FACE, NO_FACE,
1023                                            rp->cubeLoc[BOTTOM_FACE][i + MAXSIZEX * LASTZ].face, NO_FACE);
1024                                 for (j = 1; j < MAXSIZEY - 1; j++) {
1025                                         glTranslatef(0, S1, 0);
1026                                         draw_cubit(mi,
1027                                                    rp->cubeLoc[BACK_FACE][i + MAXSIZEX * j].face, NO_FACE,
1028                                                    NO_FACE, NO_FACE,
1029                                                    NO_FACE, NO_FACE);
1030                                 }
1031                                 glTranslatef(0, S1, 0);
1032                                 draw_cubit(mi,
1033                                            rp->cubeLoc[BACK_FACE][i + MAXSIZEX * LASTY].face, NO_FACE,
1034                                            NO_FACE, NO_FACE,
1035                                            NO_FACE, rp->cubeLoc[TOP_FACE][i + MAXSIZEX * FIRSTZ].face);
1036                                 for (k = 1; k < MAXSIZEZ - 1; k++) {
1037                                         glTranslatef(0, -SY, S1);
1038                                         draw_cubit(mi,
1039                                                    NO_FACE, NO_FACE,
1040                                                    NO_FACE, NO_FACE,
1041                                                    rp->cubeLoc[BOTTOM_FACE][i + MAXSIZEX * REVZ(k)].face, NO_FACE);
1042                                         /* Center */
1043                                         glTranslatef(0, SY, 0);
1044                                         draw_cubit(mi,
1045                                                    NO_FACE, NO_FACE,
1046                                                    NO_FACE, NO_FACE,
1047                                                    NO_FACE, rp->cubeLoc[TOP_FACE][i + MAXSIZEX * k].face);
1048                                 }
1049                                 glTranslatef(0, -SY, S1);
1050                                 draw_cubit(mi,
1051                                            NO_FACE, rp->cubeLoc[FRONT_FACE][i + MAXSIZEX * LASTY].face,
1052                                            NO_FACE, NO_FACE,
1053                                            rp->cubeLoc[BOTTOM_FACE][i + MAXSIZEX * FIRSTZ].face, NO_FACE);
1054                                 for (j = 1; j < MAXSIZEY - 1; j++) {
1055                                         glTranslatef(0, S1, 0);
1056                                         draw_cubit(mi,
1057                                                    NO_FACE, rp->cubeLoc[FRONT_FACE][i + MAXSIZEX * REVY(j)].face,
1058                                                    NO_FACE, NO_FACE,
1059                                                    NO_FACE, NO_FACE);
1060                                 }
1061                                 glTranslatef(0, S1, 0);
1062                                 draw_cubit(mi,
1063                                            NO_FACE, rp->cubeLoc[FRONT_FACE][i + MAXSIZEX * FIRSTY].face,
1064                                            NO_FACE, NO_FACE,
1065                                            NO_FACE, rp->cubeLoc[TOP_FACE][i + MAXSIZEX * LASTZ].face);
1066                                 glPopMatrix();
1067                         }
1068                         if (slice.depth == MAXSIZEX - 1)
1069                                 glRotatef(-rotatestep, HALFX, 0, 0);
1070                         glTranslatef(HALFX, -HALFY, -HALFZ);
1071                         draw_cubit(mi,
1072                                    rp->cubeLoc[BACK_FACE][LASTX + MAXSIZEX * FIRSTY].face, NO_FACE,
1073                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][LASTZ + MAXSIZEZ * LASTY].face,
1074                                    rp->cubeLoc[BOTTOM_FACE][LASTX + MAXSIZEX * LASTZ].face, NO_FACE);
1075                         for (j = 1; j < MAXSIZEY - 1; j++) {
1076                                 glTranslatef(0, S1, 0);
1077                                 draw_cubit(mi,
1078                                            rp->cubeLoc[BACK_FACE][LASTX + MAXSIZEX * j].face, NO_FACE,
1079                                            NO_FACE, rp->cubeLoc[RIGHT_FACE][LASTZ + MAXSIZEZ * REVY(j)].face,
1080                                            NO_FACE, NO_FACE);
1081                         }
1082                         glTranslatef(0, S1, 0);
1083                         draw_cubit(mi,
1084                                    rp->cubeLoc[BACK_FACE][LASTX + MAXSIZEX * LASTY].face, NO_FACE,
1085                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][LASTZ + MAXSIZEZ * FIRSTY].face,
1086                                    NO_FACE, rp->cubeLoc[TOP_FACE][LASTX + MAXSIZEX * FIRSTZ].face);
1087                         for (k = 1; k < MAXSIZEZ - 1; k++) {
1088                                 glTranslatef(0, -SY, S1);
1089                                 draw_cubit(mi,
1090                                            NO_FACE, NO_FACE,
1091                                            NO_FACE, rp->cubeLoc[RIGHT_FACE][REVZ(k) + MAXSIZEZ * LASTY].face,
1092                                            rp->cubeLoc[BOTTOM_FACE][LASTX + MAXSIZEX * REVZ(k)].face, NO_FACE);
1093                                 for (j = 1; j < MAXSIZEY - 1; j++) {
1094                                         glTranslatef(0, S1, 0);
1095                                         draw_cubit(mi,
1096                                                    NO_FACE, NO_FACE,
1097                                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][REVZ(k) + MAXSIZEZ * REVY(j)].face,
1098                                                    NO_FACE, NO_FACE);
1099                                 }
1100                                 glTranslatef(0, S1, 0);
1101                                 draw_cubit(mi,
1102                                            NO_FACE, NO_FACE,
1103                                            NO_FACE, rp->cubeLoc[RIGHT_FACE][REVZ(k) + MAXSIZEZ * FIRSTY].face,
1104                                            NO_FACE, rp->cubeLoc[TOP_FACE][LASTX + MAXSIZEX * k].face);
1105                         }
1106                         glTranslatef(0, -SY, S1);
1107                         draw_cubit(mi,
1108                                    NO_FACE, rp->cubeLoc[FRONT_FACE][LASTX + MAXSIZEX * LASTY].face,
1109                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][FIRSTZ + MAXSIZEZ * LASTY].face,
1110                                    rp->cubeLoc[BOTTOM_FACE][LASTX + MAXSIZEX * FIRSTZ].face, NO_FACE);
1111                         for (j = 1; j < MAXSIZEY - 1; j++) {
1112                                 glTranslatef(0, S1, 0);
1113                                 draw_cubit(mi,
1114                                            NO_FACE, rp->cubeLoc[FRONT_FACE][LASTX + MAXSIZEX * REVY(j)].face,
1115                                            NO_FACE, rp->cubeLoc[RIGHT_FACE][FIRSTZ + MAXSIZEZ * REVY(j)].face,
1116                                            NO_FACE, NO_FACE);
1117                         }
1118                         glTranslatef(0, S1, 0);
1119                         draw_cubit(mi,
1120                                    NO_FACE, rp->cubeLoc[FRONT_FACE][LASTX + MAXSIZEX * FIRSTY].face,
1121                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][FIRSTZ + MAXSIZEZ * FIRSTY].face,
1122                                    NO_FACE, rp->cubeLoc[TOP_FACE][LASTX + MAXSIZEX * LASTZ].face);
1123                         break;
1124                 case FRONT_FACE:        /* BACK_FACE too */
1125                         glPushMatrix();
1126                         if (slice.depth == MAXSIZEZ - 1)
1127                                 glRotatef(rotatestep, 0, 0, HALFZ);
1128
1129                         glTranslatef(-HALFX, -HALFY, -HALFZ);
1130                         draw_cubit(mi,
1131                                    rp->cubeLoc[BACK_FACE][FIRSTX + MAXSIZEX * FIRSTY].face, NO_FACE,
1132                                    rp->cubeLoc[LEFT_FACE][FIRSTZ + MAXSIZEZ * LASTY].face, NO_FACE,
1133                                    rp->cubeLoc[BOTTOM_FACE][FIRSTX + MAXSIZEX * LASTZ].face, NO_FACE);
1134                         for (i = 1; i < MAXSIZEX - 1; i++) {
1135                                 glTranslatef(S1, 0, 0);
1136                                 draw_cubit(mi,
1137                                            rp->cubeLoc[BACK_FACE][i + MAXSIZEX * FIRSTY].face, NO_FACE,
1138                                            NO_FACE, NO_FACE,
1139                                            rp->cubeLoc[BOTTOM_FACE][i + MAXSIZEX * LASTZ].face, NO_FACE);
1140                         }
1141                         glTranslatef(S1, 0, 0);
1142                         draw_cubit(mi,
1143                                    rp->cubeLoc[BACK_FACE][LASTX + MAXSIZEX * FIRSTY].face, NO_FACE,
1144                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][LASTZ + MAXSIZEZ * LASTY].face,
1145                                    rp->cubeLoc[BOTTOM_FACE][LASTX + MAXSIZEX * LASTZ].face, NO_FACE);
1146                         for (j = 1; j < MAXSIZEY - 1; j++) {
1147                                 glTranslatef(-SX, S1, 0);
1148                                 draw_cubit(mi,
1149                                            rp->cubeLoc[BACK_FACE][FIRSTX + MAXSIZEX * j].face, NO_FACE,
1150                                            rp->cubeLoc[LEFT_FACE][FIRSTZ + MAXSIZEZ * REVY(j)].face, NO_FACE,
1151                                            NO_FACE, NO_FACE);
1152                                 for (i = 1; i < MAXSIZEX - 1; i++) {
1153                                         glTranslatef(S1, 0, 0);
1154                                         draw_cubit(mi,
1155                                                    rp->cubeLoc[BACK_FACE][i + MAXSIZEX * j].face, NO_FACE,
1156                                                    NO_FACE, NO_FACE,
1157                                                    NO_FACE, NO_FACE);
1158                                 }
1159                                 glTranslatef(S1, 0, 0);
1160                                 draw_cubit(mi,
1161                                            rp->cubeLoc[BACK_FACE][LASTX + MAXSIZEX * j].face, NO_FACE,
1162                                            NO_FACE, rp->cubeLoc[RIGHT_FACE][LASTZ + MAXSIZEZ * REVY(j)].face,
1163                                            NO_FACE, NO_FACE);
1164                         }
1165                         glTranslatef(-SX, S1, 0);
1166                         draw_cubit(mi,
1167                                    rp->cubeLoc[BACK_FACE][FIRSTX + MAXSIZEX * LASTY].face, NO_FACE,
1168                                    rp->cubeLoc[LEFT_FACE][FIRSTZ + MAXSIZEZ * FIRSTY].face, NO_FACE,
1169                                    NO_FACE, rp->cubeLoc[TOP_FACE][FIRSTX + MAXSIZEX * FIRSTZ].face);
1170                         for (i = 1; i < MAXSIZEX - 1; i++) {
1171                                 glTranslatef(S1, 0, 0);
1172                                 draw_cubit(mi,
1173                                            rp->cubeLoc[BACK_FACE][i + MAXSIZEX * LASTY].face, NO_FACE,
1174                                            NO_FACE, NO_FACE,
1175                                            NO_FACE, rp->cubeLoc[TOP_FACE][i + MAXSIZEX * FIRSTZ].face);
1176                         }
1177                         glTranslatef(S1, 0, 0);
1178                         draw_cubit(mi,
1179                                    rp->cubeLoc[BACK_FACE][LASTX + MAXSIZEX * LASTY].face, NO_FACE,
1180                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][LASTZ + MAXSIZEZ * FIRSTY].face,
1181                                    NO_FACE, rp->cubeLoc[TOP_FACE][LASTX + MAXSIZEX * FIRSTZ].face);
1182                         glPopMatrix();
1183                         for (k = 1; k < MAXSIZEZ - 1; k++) {
1184                                 glPushMatrix();
1185                                 if (slice.depth == REVZ(k))
1186                                         glRotatef(rotatestep, 0, 0, HALFZ);
1187                                 glTranslatef(-HALFX, -HALFY, MIDZ(k));
1188                                 draw_cubit(mi,
1189                                            NO_FACE, NO_FACE,
1190                                            rp->cubeLoc[LEFT_FACE][k + MAXSIZEZ * LASTY].face, NO_FACE,
1191                                            rp->cubeLoc[BOTTOM_FACE][FIRSTX + MAXSIZEX * REVZ(k)].face, NO_FACE);
1192                                 for (i = 1; i < MAXSIZEX - 1; i++) {
1193                                         glTranslatef(S1, 0, 0);
1194                                         draw_cubit(mi,
1195                                                    NO_FACE, NO_FACE,
1196                                                    NO_FACE, NO_FACE,
1197                                                    rp->cubeLoc[BOTTOM_FACE][i + MAXSIZEX * REVZ(k)].face, NO_FACE);
1198                                 }
1199                                 glTranslatef(S1, 0, 0);
1200                                 draw_cubit(mi,
1201                                            NO_FACE, NO_FACE,
1202                                            NO_FACE, rp->cubeLoc[RIGHT_FACE][REVZ(k) + MAXSIZEZ * LASTY].face,
1203                                            rp->cubeLoc[BOTTOM_FACE][LASTX + MAXSIZEX * REVZ(k)].face, NO_FACE);
1204                                 for (j = 1; j < MAXSIZEY - 1; j++) {
1205                                         glTranslatef(-SX, S1, 0);
1206                                         draw_cubit(mi,
1207                                                    NO_FACE, NO_FACE,
1208                                                    rp->cubeLoc[LEFT_FACE][k + MAXSIZEZ * REVY(j)].face, NO_FACE,
1209                                                    NO_FACE, NO_FACE);
1210                                         /* Center */
1211                                         glTranslatef(SX, 0, 0);
1212                                         draw_cubit(mi,
1213                                                    NO_FACE, NO_FACE,
1214                                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][REVZ(k) + MAXSIZEZ * REVY(j)].face,
1215                                                    NO_FACE, NO_FACE);
1216                                 }
1217                                 glTranslatef(-SX, S1, 0);
1218                                 draw_cubit(mi,
1219                                            NO_FACE, NO_FACE,
1220                                            rp->cubeLoc[LEFT_FACE][k + MAXSIZEZ * FIRSTY].face, NO_FACE,
1221                                            NO_FACE, rp->cubeLoc[TOP_FACE][FIRSTX + MAXSIZEX * k].face);
1222                                 for (i = 1; i < MAXSIZEX - 1; i++) {
1223                                         glTranslatef(S1, 0, 0);
1224                                         draw_cubit(mi,
1225                                                    NO_FACE, NO_FACE,
1226                                                    NO_FACE, NO_FACE,
1227                                                    NO_FACE, rp->cubeLoc[TOP_FACE][i + MAXSIZEX * k].face);
1228                                 }
1229                                 glTranslatef(S1, 0, 0);
1230                                 draw_cubit(mi,
1231                                            NO_FACE, NO_FACE,
1232                                            NO_FACE, rp->cubeLoc[RIGHT_FACE][REVZ(k) + MAXSIZEZ * FIRSTY].face,
1233                                            NO_FACE, rp->cubeLoc[TOP_FACE][LASTX + MAXSIZEX * k].face);
1234                                 glPopMatrix();
1235                         }
1236                         if (slice.depth == 0)
1237                                 glRotatef(rotatestep, 0, 0, HALFZ);
1238                         glTranslatef(-HALFX, -HALFY, HALFZ);
1239                         draw_cubit(mi,
1240                                    NO_FACE, rp->cubeLoc[FRONT_FACE][FIRSTX + MAXSIZEX * LASTY].face,
1241                                    rp->cubeLoc[LEFT_FACE][LASTZ + MAXSIZEZ * LASTY].face, NO_FACE,
1242                                    rp->cubeLoc[BOTTOM_FACE][FIRSTX + MAXSIZEX * FIRSTZ].face, NO_FACE);
1243                         for (i = 1; i < MAXSIZEX - 1; i++) {
1244                                 glTranslatef(S1, 0, 0);
1245                                 draw_cubit(mi,
1246                                            NO_FACE, rp->cubeLoc[FRONT_FACE][i + MAXSIZEX * LASTY].face,
1247                                            NO_FACE, NO_FACE,
1248                                            rp->cubeLoc[BOTTOM_FACE][i + MAXSIZEX * FIRSTZ].face, NO_FACE);
1249                         }
1250                         glTranslatef(S1, 0, 0);
1251                         draw_cubit(mi,
1252                                    NO_FACE, rp->cubeLoc[FRONT_FACE][LASTX + MAXSIZEX * LASTY].face,
1253                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][FIRSTZ + MAXSIZEZ * LASTY].face,
1254                                    rp->cubeLoc[BOTTOM_FACE][LASTX + MAXSIZEX * FIRSTZ].face, NO_FACE);
1255                         for (j = 1; j < MAXSIZEY - 1; j++) {
1256                                 glTranslatef(-SX, S1, 0);
1257                                 draw_cubit(mi,
1258                                            NO_FACE, rp->cubeLoc[FRONT_FACE][FIRSTX + MAXSIZEX * REVY(j)].face,
1259                                            rp->cubeLoc[LEFT_FACE][LASTZ + MAXSIZEZ * REVY(j)].face, NO_FACE,
1260                                            NO_FACE, NO_FACE);
1261                                 for (i = 1; i < MAXSIZEX - 1; i++) {
1262                                         glTranslatef(S1, 0, 0);
1263                                         draw_cubit(mi,
1264                                                    NO_FACE, rp->cubeLoc[FRONT_FACE][i + MAXSIZEX * REVY(j)].face,
1265                                                    NO_FACE, NO_FACE,
1266                                                    NO_FACE, NO_FACE);
1267                                 }
1268                                 glTranslatef(S1, 0, 0);
1269                                 draw_cubit(mi,
1270                                            NO_FACE, rp->cubeLoc[FRONT_FACE][LASTX + MAXSIZEX * REVY(j)].face,
1271                                            NO_FACE, rp->cubeLoc[RIGHT_FACE][FIRSTZ + MAXSIZEZ * REVY(j)].face,
1272                                            NO_FACE, NO_FACE);
1273                         }
1274                         glTranslatef(-SX, S1, 0);
1275                         draw_cubit(mi,
1276                                    NO_FACE, rp->cubeLoc[FRONT_FACE][FIRSTX + MAXSIZEX * FIRSTY].face,
1277                                    rp->cubeLoc[LEFT_FACE][LASTZ + MAXSIZEZ * FIRSTY].face, NO_FACE,
1278                                    NO_FACE, rp->cubeLoc[TOP_FACE][FIRSTX + MAXSIZEX * LASTZ].face);
1279                         for (i = 1; i < MAXSIZEX - 1; i++) {
1280                                 glTranslatef(S1, 0, 0);
1281                                 draw_cubit(mi,
1282                                            NO_FACE, rp->cubeLoc[FRONT_FACE][i + MAXSIZEX * FIRSTY].face,
1283                                            NO_FACE, NO_FACE,
1284                                            NO_FACE, rp->cubeLoc[TOP_FACE][i + MAXSIZEX * LASTZ].face);
1285                         }
1286                         glTranslatef(S1, 0, 0);
1287                         draw_cubit(mi,
1288                                    NO_FACE, rp->cubeLoc[FRONT_FACE][LASTX + MAXSIZEX * FIRSTY].face,
1289                                    NO_FACE, rp->cubeLoc[RIGHT_FACE][FIRSTZ + MAXSIZEZ * FIRSTY].face,
1290                                    NO_FACE, rp->cubeLoc[TOP_FACE][LASTX + MAXSIZEX * LASTZ].face);
1291                         break;
1292         }
1293 #undef S1
1294 }
1295
1296 /* From David Bagley's xrubik.  Used by permission. ;)  */
1297 static void
1298 readRC(rubikstruct * rp, int face, int dir, int h, int orient, int size)
1299 {
1300         int         g;
1301
1302         if (dir == TOP || dir == BOTTOM)
1303                 for (g = 0; g < size; g++)
1304                         rp->rowLoc[orient][g] =
1305                                 rp->cubeLoc[face][g * size + h];
1306         else                    /* dir == RIGHT || dir == LEFT */
1307                 for (g = 0; g < size; g++)
1308                         rp->rowLoc[orient][g] =
1309                                 rp->cubeLoc[face][h * size + g];
1310 }
1311
1312 static void
1313 rotateRC(rubikstruct * rp, int rotate, int orient, int size)
1314 {
1315         int         g;
1316
1317         for (g = 0; g < size; g++)
1318                 rp->rowLoc[orient][g].rotation =
1319                         (rp->rowLoc[orient][g].rotation + rotate) % MAXORIENT;
1320 }
1321
1322 static void
1323 reverseRC(rubikstruct * rp, int orient, int size)
1324 {
1325         int         g;
1326         RubikLoc    temp;
1327
1328         for (g = 0; g < size / 2; g++) {
1329                 temp = rp->rowLoc[orient][size - 1 - g];
1330                 rp->rowLoc[orient][size - 1 - g] = rp->rowLoc[orient][g];
1331                 rp->rowLoc[orient][g] = temp;
1332         }
1333 }
1334
1335 static void
1336 writeRC(rubikstruct * rp, int face, int dir, int h, int orient, int size)
1337 {
1338         int         g, position;
1339
1340         if (dir == TOP || dir == BOTTOM) {
1341                 for (g = 0; g < size; g++) {
1342                         position = g * size + h;
1343                         rp->cubeLoc[face][position] = rp->rowLoc[orient][g];
1344                         /* DrawSquare(face, position); */
1345                 }
1346         } else {                /* dir == RIGHT || dir == LEFT */
1347                 for (g = 0; g < size; g++) {
1348                         position = h * size + g;
1349                         rp->cubeLoc[face][position] = rp->rowLoc[orient][g];
1350                         /* DrawSquare(face, position); */
1351                 }
1352         }
1353 }
1354
1355 static void
1356 rotateFace(rubikstruct * rp, int face, int direction)
1357 {
1358         int         position, i, j;
1359         RubikLoc   *faceLoc = NULL;
1360
1361         if ((faceLoc = (RubikLoc *) malloc(AVSIZESQ * sizeof (RubikLoc))) == NULL)
1362                 (void) fprintf(stderr,
1363                  "Could not allocate memory for rubik face position info\n");
1364         /* Read Face */
1365         for (position = 0; position < AVSIZESQ; position++)
1366                 faceLoc[position] = rp->cubeLoc[face][position];
1367         /* Write Face */
1368         for (position = 0; position < AVSIZESQ; position++) {
1369                 i = position % AVSIZE;
1370                 j = position / AVSIZE;
1371                 rp->cubeLoc[face][position] = (direction == CW) ?
1372                         faceLoc[(AVSIZE - i - 1) * AVSIZE + j] :
1373                         faceLoc[i * AVSIZE + AVSIZE - j - 1];
1374                 rp->cubeLoc[face][position].rotation =
1375                         (rp->cubeLoc[face][position].rotation + direction - MAXORIENT) %
1376                         MAXORIENT;
1377                 /* DrawSquare(face, position); */
1378         }
1379         if (faceLoc != NULL)
1380                 (void) free((void *) faceLoc);
1381 }
1382
1383 static void
1384 moveRubik(rubikstruct * rp, int face, int direction, int position)
1385 {
1386         int         newFace, newDirection, rotate, reverse = False;
1387         int         h, k, newH = 0;
1388         int         i, j;
1389
1390         if (direction == CW || direction == CCW) {
1391                 direction = (direction == CCW) ?
1392                         (rotateToRow[face].direction + 2) % MAXORIENT :
1393                         rotateToRow[face].direction;
1394                 i = j = (rotateToRow[face].sideFace == RIGHT ||
1395                       rotateToRow[face].sideFace == BOTTOM) ? AVSIZE - 1 : 0;
1396                 face = rotateToRow[face].face;
1397                 position = j * AVSIZE + i;
1398         }
1399         i = position % AVSIZE;
1400         j = position / AVSIZE;
1401         h = (direction == TOP || direction == BOTTOM) ? i : j;
1402         /* rotate sides CW or CCW */
1403         if (h == AVSIZE - 1) {
1404                 newDirection = (direction == TOP || direction == BOTTOM) ?
1405                         TOP : RIGHT;
1406                 if (direction == TOP || direction == RIGHT)
1407                         rotateFace(rp, rowToRotate[face][newDirection], CW);
1408                 else            /* direction == BOTTOM || direction == LEFT */
1409                         rotateFace(rp, rowToRotate[face][newDirection], CCW);
1410         }
1411         if (h == 0) {
1412                 newDirection = (direction == TOP || direction == BOTTOM) ?
1413                         BOTTOM : LEFT;
1414                 if (direction == TOP || direction == RIGHT)
1415                         rotateFace(rp, rowToRotate[face][newDirection], CCW);
1416                 else            /* direction == BOTTOM  || direction == LEFT */
1417                         rotateFace(rp, rowToRotate[face][newDirection], CW);
1418         }
1419         /* Slide rows */
1420         readRC(rp, face, direction, h, 0, AVSIZE);
1421         for (k = 1; k <= MAXORIENT; k++) {
1422                 newFace = slideNextRow[face][direction].face;
1423                 rotate = slideNextRow[face][direction].rotation;
1424                 newDirection = (rotate + direction) % MAXORIENT;
1425                 switch (rotate) {
1426                         case TOP:
1427                                 newH = h;
1428                                 reverse = False;
1429                                 break;
1430                         case RIGHT:
1431                                 if (newDirection == TOP || newDirection == BOTTOM) {
1432                                         newH = AVSIZE - 1 - h;
1433                                         reverse = False;
1434                                 } else {        /* newDirection == RIGHT || newDirection == LEFT */
1435                                         newH = h;
1436                                         reverse = True;
1437                                 }
1438                                 break;
1439                         case BOTTOM:
1440                                 newH = AVSIZE - 1 - h;
1441                                 reverse = True;
1442                                 break;
1443                         case LEFT:
1444                                 if (newDirection == TOP || newDirection == BOTTOM) {
1445                                         newH = h;
1446                                         reverse = True;
1447                                 } else {        /* newDirection == RIGHT || newDirection == LEFT */
1448                                         newH = AVSIZE - 1 - h;
1449                                         reverse = False;
1450                                 }
1451                                 break;
1452                         default:
1453                                 (void) printf("moveRubik: rotate %d\n", rotate);
1454                 }
1455                 if (k != MAXORIENT)
1456                         readRC(rp, newFace, newDirection, newH, k, AVSIZE);
1457                 rotateRC(rp, rotate, k - 1, AVSIZE);
1458                 if (reverse == True)
1459                         reverseRC(rp, k - 1, AVSIZE);
1460                 writeRC(rp, newFace, newDirection, newH, k - 1, AVSIZE);
1461                 face = newFace;
1462                 direction = newDirection;
1463                 h = newH;
1464         }
1465 }
1466
1467 #ifdef DEBUG
1468 void
1469 printCube(rubikstruct * rp)
1470 {
1471         int         face, position;
1472
1473         for (face = 0; face < MAXFACES; face++) {
1474                 for (position = 0; position < AVSIZESQ; position++) {
1475                         (void) printf("%d %d  ", rp->cubeLoc[face][position].face,
1476                                       rp->cubeLoc[face][position].rotation);
1477                         if (!((position + 1) % AVSIZE))
1478                                 (void) printf("\n");
1479                 }
1480                 (void) printf("\n");
1481         }
1482         (void) printf("\n");
1483 }
1484
1485 #endif
1486
1487 static void
1488 evalmovement(ModeInfo * mi, RubikMove movement)
1489 {
1490         rubikstruct *rp = &rubik[MI_SCREEN(mi)];
1491
1492 #ifdef DEBUG
1493         printCube(rp);
1494 #endif
1495         if (movement.face < 0 || movement.face >= MAXFACES)
1496                 return;
1497
1498         moveRubik(rp, movement.face, movement.direction, movement.position);
1499
1500 }
1501
1502 static      Bool
1503 compare_moves(rubikstruct * rp, RubikMove move1, RubikMove move2, Bool opp)
1504 {
1505         RubikSlice  slice1, slice2;
1506
1507         slice1 = convertMove(rp, move1);
1508         slice2 = convertMove(rp, move2);
1509         if (slice1.face == slice2.face &&
1510             slice1.depth == slice2.depth) {
1511                 if (slice1.rotation == slice2.rotation) {       /* CW or CCW */
1512                         if (!opp)
1513                                 return True;
1514                 } else {
1515                         if (opp)
1516                                 return True;
1517                 }
1518         }
1519         return False;
1520 }
1521
1522 static void
1523 shuffle(ModeInfo * mi)
1524 {
1525         rubikstruct *rp = &rubik[MI_SCREEN(mi)];
1526         int         i, face, position;
1527         RubikMove   move;
1528
1529         AVSIZE = MI_SIZE(mi);
1530         if (AVSIZE < -MINSIZE)
1531                 AVSIZE = NRAND(-AVSIZE - MINSIZE + 1) + MINSIZE;
1532         else if (AVSIZE < MINSIZE)
1533                 AVSIZE = MINSIZE;
1534         /* Let me waste a little space for the moment */
1535         /* Future cube to be LxMxN and not just NxNxN, but not done yet */
1536         AVSIZESQ = AVSIZE * AVSIZE;
1537 #ifdef LMN
1538         MAXSIZEX = AVSIZE;
1539         MAXSIZEY = AVSIZE;
1540         MAXSIZEZ = AVSIZE;
1541         MAXSIZE = AVSIZE;
1542         MAXSIZESQ = AVSIZESQ;
1543 #endif
1544
1545         for (face = 0; face < MAXFACES; face++) {
1546                 if (rp->cubeLoc[face] != NULL)
1547                         (void) free((void *) rp->cubeLoc[face]);
1548                 if ((rp->cubeLoc[face] =
1549                   (RubikLoc *) malloc(AVSIZESQ * sizeof (RubikLoc))) == NULL)
1550                         (void) fprintf(stderr,
1551                                        "Could not allocate memory for rubik cube position info\n");
1552                 for (position = 0; position < AVSIZESQ; position++) {
1553                         rp->cubeLoc[face][position].face = face;
1554                         rp->cubeLoc[face][position].rotation = TOP;
1555                 }
1556         }
1557         for (i = 0; i < MAXORIENT; i++) {
1558                 if (rp->rowLoc[i] != NULL)
1559                         (void) free((void *) rp->rowLoc[i]);
1560                 if ((rp->rowLoc[i] =
1561                      (RubikLoc *) malloc(AVSIZE * sizeof (RubikLoc))) == NULL)
1562                         (void) fprintf(stderr,
1563                                        "Could not allocate memory for rubik row position info\n");
1564         }
1565         rp->storedmoves = MI_COUNT(mi);
1566         if (rp->storedmoves < 0) {
1567                 if (rp->moves != NULL)
1568                         (void) free((void *) rp->moves);
1569                 rp->moves = NULL;
1570                 rp->storedmoves = NRAND(-rp->storedmoves) + 1;
1571         }
1572         if ((rp->storedmoves) && (rp->moves == NULL))
1573                 if ((rp->moves =
1574                      (RubikMove *) calloc(rp->storedmoves + 1, sizeof (RubikMove))) == NULL)
1575                         (void) fprintf(stderr,
1576                         "Could not allocate memory for rubik move buffer\n");
1577
1578         if (MI_CYCLES(mi) <= 1) {
1579                 rp->anglestep = 90.0;
1580         } else {
1581                 rp->anglestep = 90.0 / (GLfloat) (MI_CYCLES(mi));
1582         }
1583
1584         for (i = 0; i < rp->storedmoves; i++) {
1585                 int         condition;
1586
1587                 do {
1588                         move.face = NRAND(6);
1589                         move.direction = NRAND(4);      /* Exclude CW and CCW, its ok */
1590                         /*
1591                          * Randomize position along diagonal, each plane gets an equal chance.
1592                          * This trick will only work for NxNxN cubes
1593                          * draw_cube DEPENDS on that they are chosen this way.
1594                          */
1595                         move.position = NRAND(AVSIZE) * (AVSIZE + 1);
1596
1597
1598                         condition = 1;
1599
1600                         if (i > 0)      /* avoid immediate undoing moves */
1601                                 if (compare_moves(rp, move, rp->moves[i - 1], True))
1602                                         condition = 0;
1603                         if (i > 1)      /* avoid 3 consecutive identical moves */
1604                                 if (compare_moves(rp, move, rp->moves[i - 1], False) &&
1605                                     compare_moves(rp, move, rp->moves[i - 2], False))
1606                                         condition = 0;
1607                         /*
1608                            * Still some silly moves being made....
1609                          */
1610                 } while (!condition);
1611                 if (hideshuffling)
1612                         evalmovement(mi, move);
1613                 rp->moves[i] = move;
1614         }
1615
1616         rp->movement.face = NO_FACE;
1617         rp->rotatestep = 0;
1618         rp->action = hideshuffling ? ACTION_SOLVE : ACTION_SHUFFLE;
1619         rp->shufflingmoves = 0;
1620         rp->done = 0;
1621 }
1622
1623 void
1624 reshape_rubik(ModeInfo * mi, int width, int height)
1625 {
1626         rubikstruct *rp = &rubik[MI_SCREEN(mi)];
1627
1628         glViewport(0, 0, rp->WindW = (GLint) width, rp->WindH = (GLint) height);
1629         glMatrixMode(GL_PROJECTION);
1630         glLoadIdentity();
1631         glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 15.0);
1632         glMatrixMode(GL_MODELVIEW);
1633
1634         rp->AreObjectsDefined[ObjCubit] = 0;
1635 }
1636
1637 static void
1638 pinit(ModeInfo * mi)
1639 {
1640         glClearDepth(1.0);
1641         glClearColor(0.0, 0.0, 0.0, 1.0);
1642         glColor3f(1.0, 1.0, 1.0);
1643
1644         glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
1645         glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
1646         glLightfv(GL_LIGHT0, GL_POSITION, position0);
1647         glLightfv(GL_LIGHT1, GL_AMBIENT, ambient);
1648         glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse);
1649         glLightfv(GL_LIGHT1, GL_POSITION, position1);
1650         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
1651         glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
1652         glEnable(GL_LIGHTING);
1653         glEnable(GL_LIGHT0);
1654         glEnable(GL_LIGHT1);
1655         glEnable(GL_DEPTH_TEST);
1656         glEnable(GL_NORMALIZE);
1657         glEnable(GL_CULL_FACE);
1658
1659         glShadeModel(GL_FLAT);
1660         glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_shininess);
1661         glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_specular);
1662
1663         shuffle(mi);
1664 }
1665
1666 void
1667 init_rubik(ModeInfo * mi)
1668 {
1669         int         screen = MI_SCREEN(mi);
1670         rubikstruct *rp;
1671
1672         if (rubik == NULL) {
1673                 if ((rubik = (rubikstruct *) calloc(MI_NUM_SCREENS(mi),
1674                                               sizeof (rubikstruct))) == NULL)
1675                         return;
1676         }
1677         rp = &rubik[screen];
1678         rp->step = NRAND(90);
1679
1680         if ((rp->glx_context = init_GL(mi)) != NULL) {
1681
1682                 reshape_rubik(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
1683                 objects = glGenLists(1);
1684                 pinit(mi);
1685         } else {
1686                 MI_CLEARWINDOW(mi);
1687         }
1688 }
1689
1690 void
1691 draw_rubik(ModeInfo * mi)
1692 {
1693         rubikstruct *rp = &rubik[MI_SCREEN(mi)];
1694         Display    *display = MI_DISPLAY(mi);
1695         Window      window = MI_WINDOW(mi);
1696
1697         MI_IS_DRAWN(mi) = True;
1698
1699         if (!rp->glx_context)
1700                 return;
1701
1702         glDrawBuffer(GL_BACK);
1703         glXMakeCurrent(display, window, *(rp->glx_context));
1704
1705         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
1706
1707         glPushMatrix();
1708
1709         glTranslatef(0.0, 0.0, -10.0);
1710
1711     {
1712       static int frame = 0;
1713       GLfloat x, y, z;
1714 #     define SINOID(SCALE,SIZE) \
1715         ((((1 + sin((frame * (SCALE)) / 2 * M_PI)) / 2.0) * (SIZE)) - (SIZE)/2)
1716       x = SINOID(0.0071, 2.0);
1717       y = SINOID(0.0053, 2.0);
1718       z = SINOID(0.0037, 4.0);
1719       frame++;
1720       glTranslatef(x, y, z);
1721     }
1722
1723         if (!MI_IS_ICONIC(mi)) {
1724                 glScalef(Scale4Window * rp->WindH / rp->WindW, Scale4Window, Scale4Window);
1725         } else {
1726                 glScalef(Scale4Iconic * rp->WindH / rp->WindW, Scale4Iconic, Scale4Iconic);
1727         }
1728
1729         glRotatef(rp->step * 100, 1, 0, 0);
1730         glRotatef(rp->step * 95, 0, 1, 0);
1731         glRotatef(rp->step * 90, 0, 0, 1);
1732
1733         draw_cube(mi);
1734     if (mi->fps_p) do_fps (mi);
1735         glXSwapBuffers(display, window);
1736
1737         if (rp->action == ACTION_SHUFFLE) {
1738                 if (rp->done) {
1739                         if (++rp->rotatestep > DELAY_AFTER_SHUFFLING) {
1740                                 rp->movement.face = NO_FACE;
1741                                 rp->rotatestep = 0;
1742                                 rp->action = ACTION_SOLVE;
1743                                 rp->done = 0;
1744                         }
1745                 } else {
1746                         if (rp->movement.face == NO_FACE) {
1747                                 if (rp->shufflingmoves < rp->storedmoves) {
1748                                         rp->rotatestep = 0;
1749                                         rp->movement = rp->moves[rp->shufflingmoves];
1750                                 } else {
1751                                         rp->rotatestep = 0;
1752                                         rp->done = 1;
1753                                 }
1754                         } else {
1755                                 rp->rotatestep += rp->anglestep;
1756                                 if (rp->rotatestep > 90) {
1757                                         evalmovement(mi, rp->movement);
1758                                         rp->shufflingmoves++;
1759                                         rp->movement.face = NO_FACE;
1760                                 }
1761                         }
1762                 }
1763         } else {
1764                 if (rp->done) {
1765                         if (++rp->rotatestep > DELAY_AFTER_SOLVING)
1766                                 shuffle(mi);
1767                 } else {
1768                         if (rp->movement.face == NO_FACE) {
1769                                 if (rp->storedmoves > 0) {
1770                                         rp->rotatestep = 0;
1771                                         rp->movement = rp->moves[rp->storedmoves - 1];
1772                                         rp->movement.direction = (rp->movement.direction + (MAXORIENT / 2)) %
1773                                                 MAXORIENT;
1774                                 } else {
1775                                         rp->rotatestep = 0;
1776                                         rp->done = 1;
1777                                 }
1778                         } else {
1779                                 rp->rotatestep += rp->anglestep;
1780                                 if (rp->rotatestep > 90) {
1781                                         evalmovement(mi, rp->movement);
1782                                         rp->storedmoves--;
1783                                         rp->movement.face = NO_FACE;
1784                                 }
1785                         }
1786                 }
1787         }
1788
1789         glPopMatrix();
1790
1791         glFlush();
1792
1793         rp->step += 0.05;
1794 }
1795
1796 void
1797 change_rubik(ModeInfo * mi)
1798 {
1799         rubikstruct *rp = &rubik[MI_SCREEN(mi)];
1800
1801         if (!rp->glx_context)
1802                 return;
1803         pinit(mi);
1804 }
1805
1806 void
1807 release_rubik(ModeInfo * mi)
1808 {
1809         if (rubik != NULL) {
1810                 int         screen;
1811
1812                 for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
1813                         rubikstruct *rp = &rubik[screen];
1814                         int         i;
1815
1816                         for (i = 0; i < MAXFACES; i++)
1817                                 if (rp->cubeLoc[i] != NULL)
1818                                         (void) free((void *) rp->cubeLoc[i]);
1819                         for (i = 0; i < MAXORIENT; i++)
1820                                 if (rp->rowLoc[i] != NULL)
1821                                         (void) free((void *) rp->rowLoc[i]);
1822                         if (rp->moves != NULL)
1823                                 (void) free((void *) rp->moves);
1824                 }
1825                 (void) free((void *) rubik);
1826                 rubik = NULL;
1827         }
1828         FreeAllGL(mi);
1829 }
1830
1831 #endif