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

   1 /* -*- Mode: C; tab-width: 4 -*- */
   2 /* pipes --- 3D selfbuiding pipe system */
   3
   4 #if !defined( lint ) && !defined( SABER )
   5 static const char sccsid[] = "@(#)pipes.c       4.07 97/11/24 xlockmore";
   6
   7 #endif
   8
   9 /*-
  10  * Permission to use, copy, modify, and distribute this software and its
  11  * documentation for any purpose and without fee is hereby granted,
  12  * provided that the above copyright notice appear in all copies and that
  13  * both that copyright notice and this permission notice appear in
  14  * supporting documentation.
  15  *
  16  * This file is provided AS IS with no warranties of any kind.  The author
  17  * shall have no liability with respect to the infringement of copyrights,
  18  * trade secrets or any patents by this file or any part thereof.  In no
  19  * event will the author be liable for any lost revenue or profits or
  20  * other special, indirect and consequential damages.
  21  *
  22  * This program was inspired on a WindowsNT(R)'s screen saver. It was written
  23  * from scratch and it was not based on any other source code.
  24  *
  25  * ==========================================================================
  26  * The routine myElbow is derivated from the doughnut routine from the MesaGL
  27  * library (more especifically the Mesaaux library) written by Brian Paul.
  28  * ==========================================================================
  29  *
  30  * Thanks goes to Brian Paul for making it possible and inexpensive to use
  31  * OpenGL at home.
  32  *
  33  * Since I'm not a native English speaker, my apologies for any grammatical
  34  * mistake.
  35  *
  36  * My e-mail address is
  37  * m-vianna@usa.net
  38  * Marcelo F. Vianna (Apr-09-1997)
  39  *
  40  * Revision History:
  41  * 29-Apr-97: Factory equipment by Ed Mackey.  Productive day today, eh?
  42  * 29-Apr-97: Less tight turns Jeff Epler <jepler@inetnebr.com>
  43  * 29-Apr-97: Efficiency speed-ups by Marcelo F. Vianna
  44  */
  45
  46 /*-
  47  * due to a Bug/feature in VMS X11/Intrinsic.h has to be placed before xlock.
  48  * otherwise caddr_t is not defined correctly
  49  */
  50
  51 #include <X11/Intrinsic.h>
  52
  53 #ifdef STANDALONE
  54 # define PROGCLASS                                      "Pipes"
  55 # define HACK_INIT                                      init_pipes
  56 # define HACK_DRAW                                      draw_pipes
  57 # define HACK_RESHAPE                           reshape_pipes
  58 # define pipes_opts                                     xlockmore_opts
  59 # define DEFAULTS       "*delay:                100     \n"                     \
  60                                         "*count:                2       \n"                     \
  61                                         "*cycles:               5       \n"                     \
  62                                         "*size:                 500     \n"                     \
  63                         "*showFPS:      False   \n"                 \
  64                         "*fpsSolid:     True    \n"                 \
  65                                         "*fisheye:              True    \n"                     \
  66                                         "*tightturns:   False   \n"                     \
  67                                         "*rotatepipes:  True    \n"
  68 # include "xlockmore.h"                         /* from the xscreensaver distribution */
  69 #else  /* !STANDALONE */
  70 # include "xlock.h"                                     /* from the xlockmore distribution */
  71 #endif /* !STANDALONE */
  72
  73 #ifdef USE_GL
  74
  75 #include <GL/glu.h>
  76 #include "buildlwo.h"
  77
  78 #define DEF_FACTORY     "2"
  79 #define DEF_FISHEYE     "True"
  80 #define DEF_TIGHTTURNS  "False"
  81 #define DEF_ROTATEPIPES "True"
  82 #define NofSysTypes     3
  83
  84 static int  factory;
  85 static Bool fisheye, tightturns, rotatepipes;
  86
  87 static XrmOptionDescRec opts[] =
  88 {
  89         {"-factory", ".pipes.factory", XrmoptionSepArg, (caddr_t) NULL},
  90         {"-fisheye", ".pipes.fisheye", XrmoptionNoArg, (caddr_t) "on"},
  91         {"+fisheye", ".pipes.fisheye", XrmoptionNoArg, (caddr_t) "off"},
  92         {"-tightturns", ".pipes.tightturns", XrmoptionNoArg, (caddr_t) "on"},
  93         {"+tightturns", ".pipes.tightturns", XrmoptionNoArg, (caddr_t) "off"},
  94       {"-rotatepipes", ".pipes.rotatepipes", XrmoptionNoArg, (caddr_t) "on"},
  95       {"+rotatepipes", ".pipes.rotatepipes", XrmoptionNoArg, (caddr_t) "off"}
  96 };
  97 static argtype vars[] =
  98 {
  99         {(caddr_t *) & factory, "factory", "Factory", DEF_FACTORY, t_Int},
 100         {(caddr_t *) & fisheye, "fisheye", "Fisheye", DEF_FISHEYE, t_Bool},
 101         {(caddr_t *) & tightturns, "tightturns", "Tightturns", DEF_TIGHTTURNS, t_Bool},
 102         {(caddr_t *) & rotatepipes, "rotatepipes", "Rotatepipes", DEF_ROTATEPIPES, t_Bool}
 103 };
 104 static OptionStruct desc[] =
 105 {
 106         {"-factory num", "how much extra equipment in pipes (0 for none)"},
 107         {"-/+fisheye", "turn on/off zoomed-in view of pipes"},
 108         {"-/+tightturns", "turn on/off tight turns"},
 109         {"-/+rotatepipes", "turn on/off pipe system rotation per screenful"}
 110 };
 111
 112 ModeSpecOpt pipes_opts =
 113 {sizeof opts / sizeof opts[0], opts, sizeof vars / sizeof vars[0], vars, desc};
 114
 115 #ifdef USE_MODULES
 116 ModStruct   pipes_description =
 117 {"pipes", "init_pipes", "draw_pipes", "release_pipes",
 118  "draw_pipes",
 119  "change_pipes", NULL, &pipes_opts,
 120  1000, 2, 5, 500, 4, 1.0, "",
 121  "Shows a selfbuilding pipe system", 0, NULL};
 122
 123 #endif
 124
 125 #define Scale4Window               0.1
 126 #define Scale4Iconic               0.07
 127
 128 #define one_third                  0.3333333333333333333
 129
 130 #define dirNone -1
 131 #define dirUP 0
 132 #define dirDOWN 1
 133 #define dirLEFT 2
 134 #define dirRIGHT 3
 135 #define dirNEAR 4
 136 #define dirFAR 5
 137
 138 #define HCELLS 33
 139 #define VCELLS 25
 140 #define DEFINEDCOLORS 7
 141 #define elbowradius 0.5
 142
 143 /*************************************************************************/
 144
 145 typedef struct {
 146         int         flip;
 147
 148         GLint       WindH, WindW;
 149         int         Cells[HCELLS][VCELLS][HCELLS];
 150         int         usedcolors[DEFINEDCOLORS];
 151         int         directions[6];
 152         int         ndirections;
 153         int         nowdir, olddir;
 154         int         system_number;
 155         int         counter;
 156         int         PX, PY, PZ;
 157         int         number_of_systems;
 158         int         system_type;
 159         int         system_length;
 160         int         turncounter;
 161         Window      window;
 162         float      *system_color;
 163         GLfloat     initial_rotation;
 164         GLuint      valve, bolts, betweenbolts, elbowbolts, elbowcoins;
 165         GLuint      guagehead, guageface, guagedial, guageconnector;
 166         GLXContext *glx_context;
 167 } pipesstruct;
 168
 169 extern struct lwo LWO_BigValve, LWO_PipeBetweenBolts, LWO_Bolts3D;
 170 extern struct lwo LWO_GuageHead, LWO_GuageFace, LWO_GuageDial, LWO_GuageConnector;
 171 extern struct lwo LWO_ElbowBolts, LWO_ElbowCoins;
 172
 173 static float front_shininess[] =
 174 {60.0};
 175 static float front_specular[] =
 176 {0.7, 0.7, 0.7, 1.0};
 177 static float ambient0[] =
 178 {0.4, 0.4, 0.4, 1.0};
 179 static float diffuse0[] =
 180 {1.0, 1.0, 1.0, 1.0};
 181 static float ambient1[] =
 182 {0.2, 0.2, 0.2, 1.0};
 183 static float diffuse1[] =
 184 {0.5, 0.5, 0.5, 1.0};
 185 static float position0[] =
 186 {1.0, 1.0, 1.0, 0.0};
 187 static float position1[] =
 188 {-1.0, -1.0, 1.0, 0.0};
 189 static float lmodel_ambient[] =
 190 {0.5, 0.5, 0.5, 1.0};
 191 static float lmodel_twoside[] =
 192 {GL_TRUE};
 193
 194 static float MaterialRed[] =
 195 {0.7, 0.0, 0.0, 1.0};
 196 static float MaterialGreen[] =
 197 {0.1, 0.5, 0.2, 1.0};
 198 static float MaterialBlue[] =
 199 {0.0, 0.0, 0.7, 1.0};
 200 static float MaterialCyan[] =
 201 {0.2, 0.5, 0.7, 1.0};
 202 static float MaterialYellow[] =
 203 {0.7, 0.7, 0.0, 1.0};
 204 static float MaterialMagenta[] =
 205 {0.6, 0.2, 0.5, 1.0};
 206 static float MaterialWhite[] =
 207 {0.7, 0.7, 0.7, 1.0};
 208 static float MaterialGray[] =
 209 {0.2, 0.2, 0.2, 1.0};
 210
 211 static pipesstruct *pipes = NULL;
 212
 213
 214 static void
 215 MakeTube(int direction)
 216 {
 217         float       an;
 218         float       SINan_3, COSan_3;
 219
 220         /*dirUP    = 00000000 */
 221         /*dirDOWN  = 00000001 */
 222         /*dirLEFT  = 00000010 */
 223         /*dirRIGHT = 00000011 */
 224         /*dirNEAR  = 00000100 */
 225         /*dirFAR   = 00000101 */
 226
 227         if (!(direction & 4)) {
 228                 glRotatef(90.0, (direction & 2) ? 0.0 : 1.0,
 229                           (direction & 2) ? 1.0 : 0.0, 0.0);
 230         }
 231         glBegin(GL_QUAD_STRIP);
 232         for (an = 0.0; an <= 2.0 * M_PI; an += M_PI / 12.0) {
 233                 glNormal3f((COSan_3 = cos(an) / 3.0), (SINan_3 = sin(an) / 3.0), 0.0);
 234                 glVertex3f(COSan_3, SINan_3, one_third);
 235                 glVertex3f(COSan_3, SINan_3, -one_third);
 236         }
 237         glEnd();
 238 }
 239
 240 static void
 241 mySphere(float radius)
 242 {
 243         GLUquadricObj *quadObj;
 244
 245         quadObj = gluNewQuadric();
 246         gluQuadricDrawStyle(quadObj, (GLenum) GLU_FILL);
 247         gluSphere(quadObj, radius, 16, 16);
 248         gluDeleteQuadric(quadObj);
 249 }
 250
 251 static void
 252 myElbow(ModeInfo * mi, int bolted)
 253 {
 254 #define nsides 25
 255 #define rings 25
 256 #define r one_third
 257 #define R one_third
 258
 259         pipesstruct *pp = &pipes[MI_SCREEN(mi)];
 260
 261         int         i, j;
 262         GLfloat     p0[3], p1[3], p2[3], p3[3];
 263         GLfloat     n0[3], n1[3], n2[3], n3[3];
 264         GLfloat     COSphi, COSphi1, COStheta, COStheta1;
 265         GLfloat     _SINtheta, _SINtheta1;
 266
 267         for (i = 0; i <= rings / 4; i++) {
 268                 GLfloat     theta, theta1;
 269
 270                 theta = (GLfloat) i *2.0 * M_PI / rings;
 271
 272                 theta1 = (GLfloat) (i + 1) * 2.0 * M_PI / rings;
 273                 for (j = 0; j < nsides; j++) {
 274                         GLfloat     phi, phi1;
 275
 276                         phi = (GLfloat) j *2.0 * M_PI / nsides;
 277
 278                         phi1 = (GLfloat) (j + 1) * 2.0 * M_PI / nsides;
 279
 280                         p0[0] = (COStheta = cos(theta)) * (R + r * (COSphi = cos(phi)));
 281                         p0[1] = (_SINtheta = -sin(theta)) * (R + r * COSphi);
 282
 283                         p1[0] = (COStheta1 = cos(theta1)) * (R + r * COSphi);
 284                         p1[1] = (_SINtheta1 = -sin(theta1)) * (R + r * COSphi);
 285
 286                         p2[0] = COStheta1 * (R + r * (COSphi1 = cos(phi1)));
 287                         p2[1] = _SINtheta1 * (R + r * COSphi1);
 288
 289                         p3[0] = COStheta * (R + r * COSphi1);
 290                         p3[1] = _SINtheta * (R + r * COSphi1);
 291
 292                         n0[0] = COStheta * COSphi;
 293                         n0[1] = _SINtheta * COSphi;
 294
 295                         n1[0] = COStheta1 * COSphi;
 296                         n1[1] = _SINtheta1 * COSphi;
 297
 298                         n2[0] = COStheta1 * COSphi1;
 299                         n2[1] = _SINtheta1 * COSphi1;
 300
 301                         n3[0] = COStheta * COSphi1;
 302                         n3[1] = _SINtheta * COSphi1;
 303
 304                         p0[2] = p1[2] = r * (n0[2] = n1[2] = sin(phi));
 305                         p2[2] = p3[2] = r * (n2[2] = n3[2] = sin(phi1));
 306
 307                         glBegin(GL_QUADS);
 308                         glNormal3fv(n3);
 309                         glVertex3fv(p3);
 310                         glNormal3fv(n2);
 311                         glVertex3fv(p2);
 312                         glNormal3fv(n1);
 313                         glVertex3fv(p1);
 314                         glNormal3fv(n0);
 315                         glVertex3fv(p0);
 316                         glEnd();
 317                 }
 318         }
 319
 320         if (factory > 0 && bolted) {
 321                 /* Bolt the elbow onto the pipe system */
 322                 glFrontFace(GL_CW);
 323                 glPushMatrix();
 324                 glRotatef(90.0, 0.0, 0.0, -1.0);
 325                 glRotatef(90.0, 0.0, 1.0, 0.0);
 326                 glTranslatef(0.0, one_third, one_third);
 327                 glCallList(pp->elbowcoins);
 328                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray);
 329                 glCallList(pp->elbowbolts);
 330                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, pp->system_color);
 331                 glPopMatrix();
 332                 glFrontFace(GL_CCW);
 333         }
 334 #undef r
 335 #undef R
 336 #undef nsides
 337 #undef rings
 338 }
 339
 340 static void
 341 FindNeighbors(ModeInfo * mi)
 342 {
 343         pipesstruct *pp = &pipes[MI_SCREEN(mi)];
 344
 345         pp->ndirections = 0;
 346         pp->directions[dirUP] = (!pp->Cells[pp->PX][pp->PY + 1][pp->PZ]) ? 1 : 0;
 347         pp->ndirections += pp->directions[dirUP];
 348         pp->directions[dirDOWN] = (!pp->Cells[pp->PX][pp->PY - 1][pp->PZ]) ? 1 : 0;
 349         pp->ndirections += pp->directions[dirDOWN];
 350         pp->directions[dirLEFT] = (!pp->Cells[pp->PX - 1][pp->PY][pp->PZ]) ? 1 : 0;
 351         pp->ndirections += pp->directions[dirLEFT];
 352         pp->directions[dirRIGHT] = (!pp->Cells[pp->PX + 1][pp->PY][pp->PZ]) ? 1 : 0;
 353         pp->ndirections += pp->directions[dirRIGHT];
 354         pp->directions[dirFAR] = (!pp->Cells[pp->PX][pp->PY][pp->PZ - 1]) ? 1 : 0;
 355         pp->ndirections += pp->directions[dirFAR];
 356         pp->directions[dirNEAR] = (!pp->Cells[pp->PX][pp->PY][pp->PZ + 1]) ? 1 : 0;
 357         pp->ndirections += pp->directions[dirNEAR];
 358 }
 359
 360 static int
 361 SelectNeighbor(ModeInfo * mi)
 362 {
 363         pipesstruct *pp = &pipes[MI_SCREEN(mi)];
 364         int         dirlist[6];
 365         int         i, j;
 366
 367         for (i = 0, j = 0; i < 6; i++) {
 368                 if (pp->directions[i]) {
 369                         dirlist[j] = i;
 370                         j++;
 371                 }
 372         }
 373
 374         return dirlist[NRAND(pp->ndirections)];
 375 }
 376
 377 static void
 378 MakeValve(ModeInfo * mi, int newdir)
 379 {
 380         pipesstruct *pp = &pipes[MI_SCREEN(mi)];
 381
 382         /* There is a glPopMatrix() right after this subroutine returns. */
 383         switch (newdir) {
 384                 case dirUP:
 385                 case dirDOWN:
 386                         glRotatef(90.0, 1.0, 0.0, 0.0);
 387                         glRotatef(NRAND(3) * 90.0, 0.0, 0.0, 1.0);
 388                         break;
 389                 case dirLEFT:
 390                 case dirRIGHT:
 391                         glRotatef(90.0, 0.0, -1.0, 0.0);
 392                         glRotatef((NRAND(3) * 90.0) - 90.0, 0.0, 0.0, 1.0);
 393                         break;
 394                 case dirNEAR:
 395                 case dirFAR:
 396                         glRotatef(NRAND(4) * 90.0, 0.0, 0.0, 1.0);
 397                         break;
 398         }
 399         glFrontFace(GL_CW);
 400         glCallList(pp->betweenbolts);
 401         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray);
 402         glCallList(pp->bolts);
 403         if (!MI_IS_MONO(mi)) {
 404                 if (pp->system_color == MaterialRed) {
 405                         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, NRAND(2) ? MaterialYellow : MaterialBlue);
 406                 } else if (pp->system_color == MaterialBlue) {
 407                         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, NRAND(2) ? MaterialRed : MaterialYellow);
 408                 } else if (pp->system_color == MaterialYellow) {
 409                         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, NRAND(2) ? MaterialBlue : MaterialRed);
 410                 } else {
 411                         switch ((NRAND(3))) {
 412                                 case 0:
 413                                         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialRed);
 414                                         break;
 415                                 case 1:
 416                                         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialBlue);
 417                                         break;
 418                                 case 2:
 419                                         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialYellow);
 420                         }
 421                 }
 422         }
 423         glRotatef((GLfloat) (NRAND(90)), 1.0, 0.0, 0.0);
 424         glCallList(pp->valve);
 425         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, pp->system_color);
 426         glFrontFace(GL_CCW);
 427 }
 428
 429 static int
 430 MakeGuage(ModeInfo * mi, int newdir)
 431 {
 432         pipesstruct *pp = &pipes[MI_SCREEN(mi)];
 433
 434         /* Can't have a guage on a vertical pipe. */
 435         if ((newdir == dirUP) || (newdir == dirDOWN))
 436                 return (0);
 437
 438         /* Is there space above this pipe for a guage? */
 439         if (!pp->directions[dirUP])
 440                 return (0);
 441
 442         /* Yes!  Mark the space as used. */
 443         pp->Cells[pp->PX][pp->PY + 1][pp->PZ] = 1;
 444
 445         glFrontFace(GL_CW);
 446         glPushMatrix();
 447         if ((newdir == dirLEFT) || (newdir == dirRIGHT))
 448                 glRotatef(90.0, 0.0, 1.0, 0.0);
 449         glCallList(pp->betweenbolts);
 450         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialGray);
 451         glCallList(pp->bolts);
 452         glPopMatrix();
 453
 454         glCallList(pp->guageconnector);
 455         glPushMatrix();
 456         glTranslatef(0.0, 1.33333, 0.0);
 457         /* Do not change the above to 1 + ONE_THIRD, because */
 458         /* the object really is centered on 1.3333300000. */
 459         glRotatef(NRAND(270) + 45.0, 0.0, 0.0, -1.0);
 460         /* Random rotation for the dial.  I love it. */
 461         glCallList(pp->guagedial);
 462         glPopMatrix();
 463
 464         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, pp->system_color);
 465         glCallList(pp->guagehead);
 466
 467         /* GuageFace is drawn last, in case of low-res depth buffers. */
 468         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, MaterialWhite);
 469         glCallList(pp->guageface);
 470
 471         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, pp->system_color);
 472         glFrontFace(GL_CCW);
 473
 474         return (1);
 475 }
 476
 477 static void
 478 MakeShape(ModeInfo * mi, int newdir)
 479 {
 480         switch (NRAND(2)) {
 481                 case 1:
 482                         if (!MakeGuage(mi, newdir))
 483                                 MakeTube(newdir);
 484                         break;
 485                 default:
 486                         MakeValve(mi, newdir);
 487                         break;
 488         }
 489 }
 490
 491 void
 492 reshape_pipes(ModeInfo * mi, int width, int height)
 493 {
 494         pipesstruct *pp = &pipes[MI_SCREEN(mi)];
 495
 496         glViewport(0, 0, pp->WindW = (GLint) width, pp->WindH = (GLint) height);
 497         glMatrixMode(GL_PROJECTION);
 498         glLoadIdentity();
 499         /*glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 15.0); */
 500         gluPerspective(65.0, (GLfloat) width / (GLfloat) height, 0.1, 20.0);
 501         glMatrixMode(GL_MODELVIEW);
 502
 503   glClear(GL_COLOR_BUFFER_BIT);
 504 }
 505
 506 static void
 507 pinit(ModeInfo * mi, int zera)
 508 {
 509         pipesstruct *pp = &pipes[MI_SCREEN(mi)];
 510         int         X, Y, Z;
 511
 512         glClearDepth(1.0);
 513         glClearColor(0.0, 0.0, 0.0, 1.0);
 514         glColor3f(1.0, 1.0, 1.0);
 515
 516         glLightfv(GL_LIGHT0, GL_AMBIENT, ambient0);
 517         glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse0);
 518         glLightfv(GL_LIGHT0, GL_POSITION, position0);
 519         glLightfv(GL_LIGHT1, GL_AMBIENT, ambient1);
 520         glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse1);
 521         glLightfv(GL_LIGHT1, GL_POSITION, position1);
 522         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
 523         glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
 524         glEnable(GL_LIGHTING);
 525         glEnable(GL_LIGHT0);
 526         glEnable(GL_LIGHT1);
 527         glEnable(GL_DEPTH_TEST);
 528         glEnable(GL_NORMALIZE);
 529         glEnable(GL_CULL_FACE);
 530
 531         glShadeModel(GL_SMOOTH);
 532         glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_shininess);
 533         glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_specular);
 534
 535         if (zera) {
 536                 pp->system_number = 1;
 537                 glDrawBuffer(GL_FRONT_AND_BACK);
 538                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 539                 (void) memset(pp->Cells, 0, sizeof (pp->Cells));
 540                 for (X = 0; X < HCELLS; X++) {
 541                         for (Y = 0; Y < VCELLS; Y++) {
 542                                 pp->Cells[X][Y][0] = 1;
 543                                 pp->Cells[X][Y][HCELLS - 1] = 1;
 544                                 pp->Cells[0][Y][X] = 1;
 545                                 pp->Cells[HCELLS - 1][Y][X] = 1;
 546                         }
 547                 }
 548                 for (X = 0; X < HCELLS; X++) {
 549                         for (Z = 0; Z < HCELLS; Z++) {
 550                                 pp->Cells[X][0][Z] = 1;
 551                                 pp->Cells[X][VCELLS - 1][Z] = 1;
 552                         }
 553                 }
 554                 (void) memset(pp->usedcolors, 0, sizeof (pp->usedcolors));
 555                 if ((pp->initial_rotation += 10.0) > 45.0) {
 556                         pp->initial_rotation -= 90.0;
 557                 }
 558         }
 559         pp->counter = 0;
 560         pp->turncounter = 0;
 561
 562         if (!MI_IS_MONO(mi)) {
 563                 int         collist[DEFINEDCOLORS];
 564                 int         i, j, lower = 1000;
 565
 566                 /* Avoid repeating colors on the same screen unless necessary */
 567                 for (i = 0; i < DEFINEDCOLORS; i++) {
 568                         if (lower > pp->usedcolors[i])
 569                                 lower = pp->usedcolors[i];
 570                 }
 571                 for (i = 0, j = 0; i < DEFINEDCOLORS; i++) {
 572                         if (pp->usedcolors[i] == lower) {
 573                                 collist[j] = i;
 574                                 j++;
 575                         }
 576                 }
 577                 i = collist[NRAND(j)];
 578                 pp->usedcolors[i]++;
 579                 switch (i) {
 580                         case 0:
 581                                 pp->system_color = MaterialRed;
 582                                 break;
 583                         case 1:
 584                                 pp->system_color = MaterialGreen;
 585                                 break;
 586                         case 2:
 587                                 pp->system_color = MaterialBlue;
 588                                 break;
 589                         case 3:
 590                                 pp->system_color = MaterialCyan;
 591                                 break;
 592                         case 4:
 593                                 pp->system_color = MaterialYellow;
 594                                 break;
 595                         case 5:
 596                                 pp->system_color = MaterialMagenta;
 597                                 break;
 598                         case 6:
 599                                 pp->system_color = MaterialWhite;
 600                                 break;
 601                 }
 602         } else {
 603                 pp->system_color = MaterialGray;
 604         }
 605
 606         do {
 607                 pp->PX = NRAND((HCELLS - 1)) + 1;
 608                 pp->PY = NRAND((VCELLS - 1)) + 1;
 609                 pp->PZ = NRAND((HCELLS - 1)) + 1;
 610         } while (pp->Cells[pp->PX][pp->PY][pp->PZ] ||
 611                  (pp->Cells[pp->PX + 1][pp->PY][pp->PZ] && pp->Cells[pp->PX - 1][pp->PY][pp->PZ] &&
 612                   pp->Cells[pp->PX][pp->PY + 1][pp->PZ] && pp->Cells[pp->PX][pp->PY - 1][pp->PZ] &&
 613                   pp->Cells[pp->PX][pp->PY][pp->PZ + 1] && pp->Cells[pp->PX][pp->PY][pp->PZ - 1]));
 614         pp->Cells[pp->PX][pp->PY][pp->PZ] = 1;
 615         pp->olddir = dirNone;
 616
 617         FindNeighbors(mi);
 618
 619         pp->nowdir = SelectNeighbor(mi);
 620 }
 621
 622 void
 623 init_pipes(ModeInfo * mi)
 624 {
 625         int         screen = MI_SCREEN(mi);
 626         pipesstruct *pp;
 627
 628         if (pipes == NULL) {
 629                 if ((pipes = (pipesstruct *) calloc(MI_NUM_SCREENS(mi),
 630                                               sizeof (pipesstruct))) == NULL)
 631                         return;
 632         }
 633         pp = &pipes[screen];
 634
 635         pp->window = MI_WINDOW(mi);
 636         if ((pp->glx_context = init_GL(mi)) != NULL) {
 637
 638                 reshape_pipes(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
 639                 if (rotatepipes)
 640                   pp->initial_rotation = NRAND(180); /* jwz */
 641                 else
 642                   pp->initial_rotation = -10.0;
 643                 pinit(mi, 1);
 644
 645                 if (factory > 0) {
 646                         pp->valve = BuildLWO(MI_IS_WIREFRAME(mi), &LWO_BigValve);
 647                         pp->bolts = BuildLWO(MI_IS_WIREFRAME(mi), &LWO_Bolts3D);
 648                         pp->betweenbolts = BuildLWO(MI_IS_WIREFRAME(mi), &LWO_PipeBetweenBolts);
 649
 650                         pp->elbowbolts = BuildLWO(MI_IS_WIREFRAME(mi), &LWO_ElbowBolts);
 651                         pp->elbowcoins = BuildLWO(MI_IS_WIREFRAME(mi), &LWO_ElbowCoins);
 652
 653                         pp->guagehead = BuildLWO(MI_IS_WIREFRAME(mi), &LWO_GuageHead);
 654                         pp->guageface = BuildLWO(MI_IS_WIREFRAME(mi), &LWO_GuageFace);
 655                         pp->guagedial = BuildLWO(MI_IS_WIREFRAME(mi), &LWO_GuageDial);
 656                         pp->guageconnector = BuildLWO(MI_IS_WIREFRAME(mi), &LWO_GuageConnector);
 657                 }
 658                 /* else they are all 0, thanks to calloc(). */
 659
 660                 if (MI_COUNT(mi) < 1 || MI_COUNT(mi) > NofSysTypes + 1) {
 661                         pp->system_type = NRAND(NofSysTypes) + 1;
 662                 } else {
 663                         pp->system_type = MI_COUNT(mi);
 664                 }
 665
 666                 if (MI_CYCLES(mi) > 0 && MI_CYCLES(mi) < 11) {
 667                         pp->number_of_systems = MI_CYCLES(mi);
 668                 } else {
 669                         pp->number_of_systems = 5;
 670                 }
 671
 672                 if (MI_SIZE(mi) < 10) {
 673                         pp->system_length = 10;
 674                 } else if (MI_SIZE(mi) > 1000) {
 675                         pp->system_length = 1000;
 676                 } else {
 677                         pp->system_length = MI_SIZE(mi);
 678                 }
 679         } else {
 680                 MI_CLEARWINDOW(mi);
 681         }
 682 }
 683
 684 void
 685 draw_pipes(ModeInfo * mi)
 686 {
 687         pipesstruct *pp = &pipes[MI_SCREEN(mi)];
 688
 689         Display    *display = MI_DISPLAY(mi);
 690         Window      window = MI_WINDOW(mi);
 691
 692         int         newdir;
 693         int         OPX, OPY, OPZ;
 694
 695         if (!pp->glx_context)
 696                 return;
 697
 698         glPushMatrix();
 699
 700         glTranslatef(0.0, 0.0, fisheye ? -3.8 : -4.8);
 701         if (rotatepipes)
 702                 glRotatef(pp->initial_rotation, 0.0, 1.0, 0.0);
 703
 704         if (!MI_IS_ICONIC(mi)) {
 705                 /* Width/height ratio handled by gluPerspective() now. */
 706                 glScalef(Scale4Window, Scale4Window, Scale4Window);
 707         } else {
 708                 glScalef(Scale4Iconic, Scale4Iconic, Scale4Iconic);
 709         }
 710
 711         FindNeighbors(mi);
 712
 713         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, pp->system_color);
 714
 715         /* If it's the begining of a system, draw a sphere */
 716         if (pp->olddir == dirNone) {
 717                 glPushMatrix();
 718                 glTranslatef((pp->PX - 16) / 3.0 * 4.0, (pp->PY - 12) / 3.0 * 4.0, (pp->PZ - 16) / 3.0 * 4.0);
 719                 mySphere(0.6);
 720                 glPopMatrix();
 721         }
 722         /* Check for stop conditions */
 723         if (pp->ndirections == 0 || pp->counter > pp->system_length) {
 724                 glPushMatrix();
 725                 glTranslatef((pp->PX - 16) / 3.0 * 4.0, (pp->PY - 12) / 3.0 * 4.0, (pp->PZ - 16) / 3.0 * 4.0);
 726                 /* Finish the system with another sphere */
 727                 mySphere(0.6);
 728
 729                 glPopMatrix();
 730
 731                 /* If the maximum number of system was drawn, restart (clearing the screen), */
 732                 /* else start a new system. */
 733                 if (++pp->system_number > pp->number_of_systems) {
 734                         (void) sleep(1);
 735                         pinit(mi, 1);
 736                 } else {
 737                         pinit(mi, 0);
 738                 }
 739
 740                 glPopMatrix();
 741                 return;
 742         }
 743         pp->counter++;
 744         pp->turncounter++;
 745
 746         /* Do will the direction change? if so, determine the new one */
 747         newdir = pp->nowdir;
 748         if (!pp->directions[newdir]) {  /* cannot proceed in the current direction */
 749                 newdir = SelectNeighbor(mi);
 750         } else {
 751                 if (tightturns) {
 752                         /* random change (20% chance) */
 753                         if ((pp->counter > 1) && (NRAND(100) < 20)) {
 754                                 newdir = SelectNeighbor(mi);
 755                         }
 756                 } else {
 757                         /* Chance to turn increases after each length of pipe drawn */
 758                         if ((pp->counter > 1) && NRAND(50) < NRAND(pp->turncounter + 1)) {
 759                                 newdir = SelectNeighbor(mi);
 760                                 pp->turncounter = 0;
 761                         }
 762                 }
 763         }
 764
 765         /* Has the direction changed? */
 766         if (newdir == pp->nowdir) {
 767                 /* If not, draw the cell's center pipe */
 768                 glPushMatrix();
 769                 glTranslatef((pp->PX - 16) / 3.0 * 4.0, (pp->PY - 12) / 3.0 * 4.0, (pp->PZ - 16) / 3.0 * 4.0);
 770                 /* Chance of factory shape here, if enabled. */
 771                 if ((pp->counter > 1) && (NRAND(100) < factory)) {
 772                         MakeShape(mi, newdir);
 773                 } else {
 774                         MakeTube(newdir);
 775                 }
 776                 glPopMatrix();
 777         } else {
 778                 /* If so, draw the cell's center elbow/sphere */
 779                 int         sysT = pp->system_type;
 780
 781                 if (sysT == NofSysTypes + 1) {
 782                         sysT = ((pp->system_number - 1) % NofSysTypes) + 1;
 783                 }
 784                 glPushMatrix();
 785
 786                 switch (sysT) {
 787                         case 1:
 788                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0, (pp->PY - 12) / 3.0 * 4.0, (pp->PZ - 16) / 3.0 * 4.0);
 789                                 mySphere(elbowradius);
 790                                 break;
 791                         case 2:
 792                         case 3:
 793                                 switch (pp->nowdir) {
 794                                         case dirUP:
 795                                                 switch (newdir) {
 796                                                         case dirLEFT:
 797                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 - (one_third), (pp->PY - 12) / 3.0 * 4.0 - (one_third), (pp->PZ - 16) / 3.0 * 4.0);
 798                                                                 glRotatef(180.0, 1.0, 0.0, 0.0);
 799                                                                 break;
 800                                                         case dirRIGHT:
 801                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 + (one_third), (pp->PY - 12) / 3.0 * 4.0 - (one_third), (pp->PZ - 16) / 3.0 * 4.0);
 802                                                                 glRotatef(180.0, 1.0, 0.0, 0.0);
 803                                                                 glRotatef(180.0, 0.0, 1.0, 0.0);
 804                                                                 break;
 805                                                         case dirFAR:
 806                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0, (pp->PY - 12) / 3.0 * 4.0 - (one_third), (pp->PZ - 16) / 3.0 * 4.0 - (one_third));
 807                                                                 glRotatef(90.0, 0.0, 1.0, 0.0);
 808                                                                 glRotatef(180.0, 0.0, 0.0, 1.0);
 809                                                                 break;
 810                                                         case dirNEAR:
 811                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0, (pp->PY - 12) / 3.0 * 4.0 - (one_third), (pp->PZ - 16) / 3.0 * 4.0 + (one_third));
 812                                                                 glRotatef(90.0, 0.0, 1.0, 0.0);
 813                                                                 glRotatef(180.0, 1.0, 0.0, 0.0);
 814                                                                 break;
 815                                                 }
 816                                                 break;
 817                                         case dirDOWN:
 818                                                 switch (newdir) {
 819                                                         case dirLEFT:
 820                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 - (one_third), (pp->PY - 12) / 3.0 * 4.0 + (one_third), (pp->PZ - 16) / 3.0 * 4.0);
 821                                                                 break;
 822                                                         case dirRIGHT:
 823                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 + (one_third), (pp->PY - 12) / 3.0 * 4.0 + (one_third), (pp->PZ - 16) / 3.0 * 4.0);
 824                                                                 glRotatef(180.0, 0.0, 1.0, 0.0);
 825                                                                 break;
 826                                                         case dirFAR:
 827                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0, (pp->PY - 12) / 3.0 * 4.0 + (one_third), (pp->PZ - 16) / 3.0 * 4.0 - (one_third));
 828                                                                 glRotatef(270.0, 0.0, 1.0, 0.0);
 829                                                                 break;
 830                                                         case dirNEAR:
 831                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0, (pp->PY - 12) / 3.0 * 4.0 + (one_third), (pp->PZ - 16) / 3.0 * 4.0 + (one_third));
 832                                                                 glRotatef(90.0, 0.0, 1.0, 0.0);
 833                                                                 break;
 834                                                 }
 835                                                 break;
 836                                         case dirLEFT:
 837                                                 switch (newdir) {
 838                                                         case dirUP:
 839                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 + (one_third), (pp->PY - 12) / 3.0 * 4.0 + (one_third), (pp->PZ - 16) / 3.0 * 4.0);
 840                                                                 glRotatef(180.0, 0.0, 1.0, 0.0);
 841                                                                 break;
 842                                                         case dirDOWN:
 843                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 + (one_third), (pp->PY - 12) / 3.0 * 4.0 - (one_third), (pp->PZ - 16) / 3.0 * 4.0);
 844                                                                 glRotatef(180.0, 1.0, 0.0, 0.0);
 845                                                                 glRotatef(180.0, 0.0, 1.0, 0.0);
 846                                                                 break;
 847                                                         case dirFAR:
 848                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 + (one_third), (pp->PY - 12) / 3.0 * 4.0, (pp->PZ - 16) / 3.0 * 4.0 - (one_third));
 849                                                                 glRotatef(270.0, 1.0, 0.0, 0.0);
 850                                                                 glRotatef(180.0, 0.0, 1.0, 0.0);
 851                                                                 break;
 852                                                         case dirNEAR:
 853                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 + (one_third), (pp->PY - 12) / 3.0 * 4.0, (pp->PZ - 16) / 3.0 * 4.0 + (one_third));
 854                                                                 glRotatef(270.0, 1.0, 0.0, 0.0);
 855                                                                 glRotatef(180.0, 0.0, 0.0, 1.0);
 856                                                                 break;
 857                                                 }
 858                                                 break;
 859                                         case dirRIGHT:
 860                                                 switch (newdir) {
 861                                                         case dirUP:
 862                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 - (one_third), (pp->PY - 12) / 3.0 * 4.0 + (one_third), (pp->PZ - 16) / 3.0 * 4.0);
 863                                                                 break;
 864                                                         case dirDOWN:
 865                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 - (one_third), (pp->PY - 12) / 3.0 * 4.0 - (one_third), (pp->PZ - 16) / 3.0 * 4.0);
 866                                                                 glRotatef(180.0, 1.0, 0.0, 0.0);
 867                                                                 break;
 868                                                         case dirFAR:
 869                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 - (one_third), (pp->PY - 12) / 3.0 * 4.0, (pp->PZ - 16) / 3.0 * 4.0 - (one_third));
 870                                                                 glRotatef(270.0, 1.0, 0.0, 0.0);
 871                                                                 break;
 872                                                         case dirNEAR:
 873                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 - (one_third), (pp->PY - 12) / 3.0 * 4.0, (pp->PZ - 16) / 3.0 * 4.0 + (one_third));
 874                                                                 glRotatef(90.0, 1.0, 0.0, 0.0);
 875                                                                 break;
 876                                                 }
 877                                                 break;
 878                                         case dirNEAR:
 879                                                 switch (newdir) {
 880                                                         case dirLEFT:
 881                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 - (one_third), (pp->PY - 12) / 3.0 * 4.0, (pp->PZ - 16) / 3.0 * 4.0 - (one_third));
 882                                                                 glRotatef(270.0, 1.0, 0.0, 0.0);
 883                                                                 break;
 884                                                         case dirRIGHT:
 885                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 + (one_third), (pp->PY - 12) / 3.0 * 4.0, (pp->PZ - 16) / 3.0 * 4.0 - (one_third));
 886                                                                 glRotatef(270.0, 1.0, 0.0, 0.0);
 887                                                                 glRotatef(180.0, 0.0, 1.0, 0.0);
 888                                                                 break;
 889                                                         case dirUP:
 890                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0, (pp->PY - 12) / 3.0 * 4.0 + (one_third), (pp->PZ - 16) / 3.0 * 4.0 - (one_third));
 891                                                                 glRotatef(270.0, 0.0, 1.0, 0.0);
 892                                                                 break;
 893                                                         case dirDOWN:
 894                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0, (pp->PY - 12) / 3.0 * 4.0 - (one_third), (pp->PZ - 16) / 3.0 * 4.0 - (one_third));
 895                                                                 glRotatef(90.0, 0.0, 1.0, 0.0);
 896                                                                 glRotatef(180.0, 0.0, 0.0, 1.0);
 897                                                                 break;
 898                                                 }
 899                                                 break;
 900                                         case dirFAR:
 901                                                 switch (newdir) {
 902                                                         case dirUP:
 903                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0, (pp->PY - 12) / 3.0 * 4.0 + (one_third), (pp->PZ - 16) / 3.0 * 4.0 + (one_third));
 904                                                                 glRotatef(90.0, 0.0, 1.0, 0.0);
 905                                                                 break;
 906                                                         case dirDOWN:
 907                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0, (pp->PY - 12) / 3.0 * 4.0 - (one_third), (pp->PZ - 16) / 3.0 * 4.0 + (one_third));
 908                                                                 glRotatef(90.0, 0.0, 1.0, 0.0);
 909                                                                 glRotatef(180.0, 1.0, 0.0, 0.0);
 910                                                                 break;
 911                                                         case dirLEFT:
 912                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 - (one_third), (pp->PY - 12) / 3.0 * 4.0, (pp->PZ - 16) / 3.0 * 4.0 + (one_third));
 913                                                                 glRotatef(90.0, 1.0, 0.0, 0.0);
 914                                                                 break;
 915                                                         case dirRIGHT:
 916                                                                 glTranslatef((pp->PX - 16) / 3.0 * 4.0 + (one_third), (pp->PY - 12) / 3.0 * 4.0, (pp->PZ - 16) / 3.0 * 4.0 + (one_third));
 917                                                                 glRotatef(270.0, 1.0, 0.0, 0.0);
 918                                                                 glRotatef(180.0, 0.0, 0.0, 1.0);
 919                                                                 break;
 920                                                 }
 921                                                 break;
 922                                 }
 923                                 myElbow(mi, (sysT == 2));
 924                                 break;
 925                 }
 926                 glPopMatrix();
 927         }
 928
 929         OPX = pp->PX;
 930         OPY = pp->PY;
 931         OPZ = pp->PZ;
 932         pp->olddir = pp->nowdir;
 933         pp->nowdir = newdir;
 934         switch (pp->nowdir) {
 935                 case dirUP:
 936                         pp->PY++;
 937                         break;
 938                 case dirDOWN:
 939                         pp->PY--;
 940                         break;
 941                 case dirLEFT:
 942                         pp->PX--;
 943                         break;
 944                 case dirRIGHT:
 945                         pp->PX++;
 946                         break;
 947                 case dirNEAR:
 948                         pp->PZ++;
 949                         break;
 950                 case dirFAR:
 951                         pp->PZ--;
 952                         break;
 953         }
 954         pp->Cells[pp->PX][pp->PY][pp->PZ] = 1;
 955
 956         /* Cells'face pipe */
 957         glTranslatef(((pp->PX + OPX) / 2.0 - 16) / 3.0 * 4.0, ((pp->PY + OPY) / 2.0 - 12) / 3.0 * 4.0, ((pp->PZ + OPZ) / 2.0 - 16) / 3.0 * 4.0);
 958         MakeTube(newdir);
 959
 960         glPopMatrix();
 961
 962         glFlush();
 963
 964     glXSwapBuffers(display, window);
 965
 966     if (mi->fps_p) do_fps (mi);
 967 }
 968
 969 void
 970 change_pipes(ModeInfo * mi)
 971 {
 972         pipesstruct *pp = &pipes[MI_SCREEN(mi)];
 973
 974         if (!pp->glx_context)
 975                 return;
 976
 977         glXMakeCurrent(MI_DISPLAY(mi), MI_WINDOW(mi), *(pp->glx_context));
 978         pinit(mi, 1);
 979 }
 980
 981 void
 982 release_pipes(ModeInfo * mi)
 983 {
 984         if (pipes != NULL) {
 985                 int         screen;
 986
 987                 for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
 988                         pipesstruct *pp = &pipes[screen];
 989
 990                         if (pp->glx_context) {
 991
 992                                 /* Display lists MUST be freed while their glXContext is current. */
 993                                 glXMakeCurrent(MI_DISPLAY(mi), pp->window, *(pp->glx_context));
 994
 995                                 if (pp->valve)
 996                                         glDeleteLists(pp->valve, 1);
 997                                 if (pp->bolts)
 998                                         glDeleteLists(pp->bolts, 1);
 999                                 if (pp->betweenbolts)
1000                                         glDeleteLists(pp->betweenbolts, 1);
1001
1002                                 if (pp->elbowbolts)
1003                                         glDeleteLists(pp->elbowbolts, 1);
1004                                 if (pp->elbowcoins)
1005                                         glDeleteLists(pp->elbowcoins, 1);
1006
1007                                 if (pp->guagehead)
1008                                         glDeleteLists(pp->guagehead, 1);
1009                                 if (pp->guageface)
1010                                         glDeleteLists(pp->guageface, 1);
1011                                 if (pp->guagedial)
1012                                         glDeleteLists(pp->guagedial, 1);
1013                                 if (pp->guageconnector)
1014                                         glDeleteLists(pp->guageconnector, 1);
1015                         }
1016                 }
1017
1018                 (void) free((void *) pipes);
1019                 pipes = NULL;
1020         }
1021         FreeAllGL(mi);
1022 }
1023
1024 #endif