progs/egl/opengl/xeglthreads.c

   1 /*
   2  * Copyright (C) 2000  Brian Paul   All Rights Reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included
  12  * in all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  * Ported to EGL by Chia-I Wu <olvaffe@gmail.com>
  22  */
  23
  24
  25 /*
  26  * This program tests EGL thread safety.
  27  * Command line options:
  28  *  -p                       Open a display connection for each thread
  29  *  -l                       Enable application-side locking
  30  *  -n <num threads>         Number of threads to create (default is 2)
  31  *  -display <display name>  Specify X display (default is $DISPLAY)
  32  *  -t                       Use texture mapping
  33  *
  34  * Brian Paul  20 July 2000
  35  */
  36
  37
  38 /*
  39  * Notes:
  40  * - Each thread gets its own EGL context.
  41  *
  42  * - The EGL contexts share texture objects.
  43  *
  44  * - When 't' is pressed to update the texture image, the window/thread which
  45  *   has input focus is signalled to change the texture.  The other threads
  46  *   should see the updated texture the next time they call glBindTexture.
  47  */
  48
  49
  50 #if defined(PTHREADS)   /* defined by Mesa on Linux and other platforms */
  51
  52 #include <assert.h>
  53 #include <X11/Xlib.h>
  54 #include <X11/Xutil.h>
  55 #include <GL/gl.h>
  56 #include <EGL/egl.h>
  57 #include <math.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <unistd.h>
  62 #include <pthread.h>
  63
  64
  65 /*
  66  * Each window/thread/context:
  67  */
  68 struct winthread {
  69    Display *Dpy;
  70    int Index;
  71    pthread_t Thread;
  72    Window Win;
  73    EGLDisplay Display;
  74    EGLContext Context;
  75    EGLSurface Surface;
  76    float Angle;
  77    int WinWidth, WinHeight;
  78    GLboolean NewSize;
  79    GLboolean Initialized;
  80    GLboolean MakeNewTexture;
  81 };
  82
  83
  84 #define MAX_WINTHREADS 100
  85 static struct winthread WinThreads[MAX_WINTHREADS];
  86 static int NumWinThreads = 0;
  87 static volatile GLboolean ExitFlag = GL_FALSE;
  88
  89 static GLboolean MultiDisplays = 0;
  90 static GLboolean Locking = 0;
  91 static GLboolean Texture = GL_FALSE;
  92 static GLuint TexObj = 12;
  93 static GLboolean Animate = GL_TRUE;
  94
  95 static pthread_mutex_t Mutex;
  96 static pthread_cond_t CondVar;
  97 static pthread_mutex_t CondMutex;
  98
  99
 100 static void
 101 Error(const char *msg)
 102 {
 103    fprintf(stderr, "Error: %s\n", msg);
 104    exit(1);
 105 }
 106
 107
 108 static void
 109 signal_redraw(void)
 110 {
 111    pthread_mutex_lock(&CondMutex);
 112    pthread_cond_broadcast(&CondVar);
 113    pthread_mutex_unlock(&CondMutex);
 114 }
 115
 116
 117 static void
 118 MakeNewTexture(struct winthread *wt)
 119 {
 120 #define TEX_SIZE 128
 121    static float step = 0.0;
 122    GLfloat image[TEX_SIZE][TEX_SIZE][4];
 123    GLint width;
 124    int i, j;
 125
 126    for (j = 0; j < TEX_SIZE; j++) {
 127       for (i = 0; i < TEX_SIZE; i++) {
 128          float dt = 5.0 * (j - 0.5 * TEX_SIZE) / TEX_SIZE;
 129          float ds = 5.0 * (i - 0.5 * TEX_SIZE) / TEX_SIZE;
 130          float r = dt * dt + ds * ds + step;
 131          image[j][i][0] =
 132          image[j][i][1] =
 133          image[j][i][2] = 0.75 + 0.25 * cos(r);
 134          image[j][i][3] = 1.0;
 135       }
 136    }
 137
 138    step += 0.5;
 139
 140    glBindTexture(GL_TEXTURE_2D, TexObj);
 141
 142    glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
 143    if (width) {
 144       assert(width == TEX_SIZE);
 145       /* sub-tex replace */
 146       glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, TEX_SIZE, TEX_SIZE,
 147                    GL_RGBA, GL_FLOAT, image);
 148    }
 149    else {
 150       /* create new */
 151       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 152       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 153
 154       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TEX_SIZE, TEX_SIZE, 0,
 155                    GL_RGBA, GL_FLOAT, image);
 156    }
 157 }
 158
 159
 160
 161 /* draw a colored cube */
 162 static void
 163 draw_object(void)
 164 {
 165    glPushMatrix();
 166    glScalef(0.75, 0.75, 0.75);
 167
 168    glColor3f(1, 0, 0);
 169
 170    if (Texture) {
 171       glBindTexture(GL_TEXTURE_2D, TexObj);
 172       glEnable(GL_TEXTURE_2D);
 173    }
 174    else {
 175       glDisable(GL_TEXTURE_2D);
 176    }
 177
 178    glBegin(GL_QUADS);
 179
 180    /* -X */
 181    glColor3f(0, 1, 1);
 182    glTexCoord2f(0, 0);  glVertex3f(-1, -1, -1);
 183    glTexCoord2f(1, 0);  glVertex3f(-1,  1, -1);
 184    glTexCoord2f(1, 1);  glVertex3f(-1,  1,  1);
 185    glTexCoord2f(0, 1);  glVertex3f(-1, -1,  1);
 186
 187    /* +X */
 188    glColor3f(1, 0, 0);
 189    glTexCoord2f(0, 0);  glVertex3f(1, -1, -1);
 190    glTexCoord2f(1, 0);  glVertex3f(1,  1, -1);
 191    glTexCoord2f(1, 1);  glVertex3f(1,  1,  1);
 192    glTexCoord2f(0, 1);  glVertex3f(1, -1,  1);
 193
 194    /* -Y */
 195    glColor3f(1, 0, 1);
 196    glTexCoord2f(0, 0);  glVertex3f(-1, -1, -1);
 197    glTexCoord2f(1, 0);  glVertex3f( 1, -1, -1);
 198    glTexCoord2f(1, 1);  glVertex3f( 1, -1,  1);
 199    glTexCoord2f(0, 1);  glVertex3f(-1, -1,  1);
 200
 201    /* +Y */
 202    glColor3f(0, 1, 0);
 203    glTexCoord2f(0, 0);  glVertex3f(-1, 1, -1);
 204    glTexCoord2f(1, 0);  glVertex3f( 1, 1, -1);
 205    glTexCoord2f(1, 1);  glVertex3f( 1, 1,  1);
 206    glTexCoord2f(0, 1);  glVertex3f(-1, 1,  1);
 207
 208    /* -Z */
 209    glColor3f(1, 1, 0);
 210    glTexCoord2f(0, 0);  glVertex3f(-1, -1, -1);
 211    glTexCoord2f(1, 0);  glVertex3f( 1, -1, -1);
 212    glTexCoord2f(1, 1);  glVertex3f( 1,  1, -1);
 213    glTexCoord2f(0, 1);  glVertex3f(-1,  1, -1);
 214
 215    /* +Y */
 216    glColor3f(0, 0, 1);
 217    glTexCoord2f(0, 0);  glVertex3f(-1, -1, 1);
 218    glTexCoord2f(1, 0);  glVertex3f( 1, -1, 1);
 219    glTexCoord2f(1, 1);  glVertex3f( 1,  1, 1);
 220    glTexCoord2f(0, 1);  glVertex3f(-1,  1, 1);
 221
 222    glEnd();
 223
 224    glPopMatrix();
 225 }
 226
 227
 228 /* signal resize of given window */
 229 static void
 230 resize(struct winthread *wt, int w, int h)
 231 {
 232    wt->NewSize = GL_TRUE;
 233    wt->WinWidth = w;
 234    wt->WinHeight = h;
 235    if (!Animate)
 236       signal_redraw();
 237 }
 238
 239
 240 /*
 241  * We have an instance of this for each thread.
 242  */
 243 static void
 244 draw_loop(struct winthread *wt)
 245 {
 246    while (!ExitFlag) {
 247
 248       if (Locking)
 249          pthread_mutex_lock(&Mutex);
 250
 251       if (!wt->Initialized) {
 252          eglMakeCurrent(wt->Display, wt->Surface, wt->Surface, wt->Context);
 253          printf("xeglthreads: %d: GL_RENDERER = %s\n", wt->Index,
 254                 (char *) glGetString(GL_RENDERER));
 255          if (Texture /*&& wt->Index == 0*/) {
 256             MakeNewTexture(wt);
 257          }
 258          wt->Initialized = GL_TRUE;
 259       }
 260
 261       if (Locking)
 262          pthread_mutex_unlock(&Mutex);
 263
 264       eglBindAPI(EGL_OPENGL_API);
 265       if (eglGetCurrentContext() != wt->Context) {
 266          printf("xeglthreads: current context %p != %p\n",
 267                eglGetCurrentContext(), wt->Context);
 268       }
 269
 270       glEnable(GL_DEPTH_TEST);
 271
 272       if (wt->NewSize) {
 273          GLfloat w = (float) wt->WinWidth / (float) wt->WinHeight;
 274          glViewport(0, 0, wt->WinWidth, wt->WinHeight);
 275          glMatrixMode(GL_PROJECTION);
 276          glLoadIdentity();
 277          glFrustum(-w, w, -1.0, 1.0, 1.5, 10);
 278          glMatrixMode(GL_MODELVIEW);
 279          glLoadIdentity();
 280          glTranslatef(0, 0, -2.5);
 281          wt->NewSize = GL_FALSE;
 282       }
 283
 284       if (wt->MakeNewTexture) {
 285          MakeNewTexture(wt);
 286          wt->MakeNewTexture = GL_FALSE;
 287       }
 288
 289       glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 290
 291       glPushMatrix();
 292          glRotatef(wt->Angle, 0, 1, 0);
 293          glRotatef(wt->Angle, 1, 0, 0);
 294          glScalef(0.7, 0.7, 0.7);
 295          draw_object();
 296       glPopMatrix();
 297
 298       if (Locking)
 299          pthread_mutex_lock(&Mutex);
 300
 301       eglSwapBuffers(wt->Display, wt->Surface);
 302
 303       if (Locking)
 304          pthread_mutex_unlock(&Mutex);
 305
 306       if (Animate) {
 307          usleep(5000);
 308       }
 309       else {
 310          /* wait for signal to draw */
 311          pthread_mutex_lock(&CondMutex);
 312          pthread_cond_wait(&CondVar, &CondMutex);
 313          pthread_mutex_unlock(&CondMutex);
 314       }
 315       wt->Angle += 1.0;
 316    }
 317    eglMakeCurrent(wt->Display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
 318 }
 319
 320
 321 static void
 322 keypress(XEvent *event, struct winthread *wt)
 323 {
 324    char buf[100];
 325    KeySym keySym;
 326    XComposeStatus stat;
 327
 328    XLookupString(&event->xkey, buf, sizeof(buf), &keySym, &stat);
 329
 330    switch (keySym) {
 331    case XK_Escape:
 332       /* tell all threads to exit */
 333       if (!Animate) {
 334          signal_redraw();
 335       }
 336       ExitFlag = GL_TRUE;
 337       /*printf("exit draw_loop %d\n", wt->Index);*/
 338       return;
 339    case XK_t:
 340    case XK_T:
 341       if (Texture) {
 342          wt->MakeNewTexture = GL_TRUE;
 343          if (!Animate)
 344             signal_redraw();
 345       }
 346       break;
 347    case XK_a:
 348    case XK_A:
 349       Animate = !Animate;
 350       if (Animate)  /* yes, prev Animate state! */
 351          signal_redraw();
 352       break;
 353    case XK_s:
 354    case XK_S:
 355       if (!Animate)
 356          signal_redraw();
 357       break;
 358    default:
 359       ; /* nop */
 360    }
 361 }
 362
 363
 364 /*
 365  * The main process thread runs this loop.
 366  * Single display connection for all threads.
 367  */
 368 static void
 369 event_loop(Display *dpy)
 370 {
 371    XEvent event;
 372    int i;
 373
 374    assert(!MultiDisplays);
 375
 376    while (!ExitFlag) {
 377
 378       if (Locking) {
 379          while (1) {
 380             int k;
 381             pthread_mutex_lock(&Mutex);
 382             k = XPending(dpy);
 383             if (k) {
 384                XNextEvent(dpy, &event);
 385                pthread_mutex_unlock(&Mutex);
 386                break;
 387             }
 388             pthread_mutex_unlock(&Mutex);
 389             usleep(5000);
 390          }
 391       }
 392       else {
 393          XNextEvent(dpy, &event);
 394       }
 395
 396       switch (event.type) {
 397          case ConfigureNotify:
 398             /* Find winthread for this event's window */
 399             for (i = 0; i < NumWinThreads; i++) {
 400                struct winthread *wt = &WinThreads[i];
 401                if (event.xconfigure.window == wt->Win) {
 402                   resize(wt, event.xconfigure.width,
 403                          event.xconfigure.height);
 404                   break;
 405                }
 406             }
 407             break;
 408          case KeyPress:
 409             for (i = 0; i < NumWinThreads; i++) {
 410                struct winthread *wt = &WinThreads[i];
 411                if (event.xkey.window == wt->Win) {
 412                   keypress(&event, wt);
 413                   break;
 414                }
 415             }
 416             break;
 417          default:
 418             /*no-op*/ ;
 419       }
 420    }
 421 }
 422
 423
 424 /*
 425  * Separate display connection for each thread.
 426  */
 427 static void
 428 event_loop_multi(void)
 429 {
 430    XEvent event;
 431    int w = 0;
 432
 433    assert(MultiDisplays);
 434
 435    while (!ExitFlag) {
 436       struct winthread *wt = &WinThreads[w];
 437       if (XPending(wt->Dpy)) {
 438          XNextEvent(wt->Dpy, &event);
 439          switch (event.type) {
 440          case ConfigureNotify:
 441             resize(wt, event.xconfigure.width, event.xconfigure.height);
 442             break;
 443          case KeyPress:
 444             keypress(&event, wt);
 445             break;
 446          default:
 447             ; /* nop */
 448          }
 449       }
 450       w = (w + 1) % NumWinThreads;
 451       usleep(5000);
 452    }
 453 }
 454
 455
 456
 457 /*
 458  * we'll call this once for each thread, before the threads are created.
 459  */
 460 static void
 461 create_window(struct winthread *wt, EGLContext shareCtx)
 462 {
 463    Window win;
 464    EGLContext ctx;
 465    EGLSurface surf;
 466    EGLint attribs[] = { EGL_RED_SIZE, 1,
 467                         EGL_GREEN_SIZE, 1,
 468                         EGL_BLUE_SIZE, 1,
 469                         EGL_DEPTH_SIZE, 1,
 470                         EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
 471                         EGL_NONE };
 472    EGLConfig config;
 473    EGLint num_configs;
 474    EGLint vid;
 475    int scrnum;
 476    XSetWindowAttributes attr;
 477    unsigned long mask;
 478    Window root;
 479    XVisualInfo *visinfo, visTemplate;
 480    int num_visuals;
 481    int width = 160, height = 160;
 482    int xpos = (wt->Index % 8) * (width + 10);
 483    int ypos = (wt->Index / 8) * (width + 20);
 484
 485    scrnum = DefaultScreen(wt->Dpy);
 486    root = RootWindow(wt->Dpy, scrnum);
 487
 488    if (!eglChooseConfig(wt->Display, attribs, &config, 1, &num_configs) ||
 489        !num_configs) {
 490       Error("Unable to choose an EGL config");
 491    }
 492
 493    assert(config);
 494    assert(num_configs > 0);
 495
 496    if (!eglGetConfigAttrib(wt->Display, config, EGL_NATIVE_VISUAL_ID, &vid)) {
 497       Error("Unable to get visual id of EGL config\n");
 498    }
 499
 500    visTemplate.visualid = vid;
 501    visinfo = XGetVisualInfo(wt->Dpy, VisualIDMask,
 502                         &visTemplate, &num_visuals);
 503    if (!visinfo) {
 504       Error("Unable to find RGB, Z, double-buffered visual");
 505    }
 506
 507    /* window attributes */
 508    attr.background_pixel = 0;
 509    attr.border_pixel = 0;
 510    attr.colormap = XCreateColormap(wt->Dpy, root, visinfo->visual, AllocNone);
 511    attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
 512    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
 513
 514    win = XCreateWindow(wt->Dpy, root, xpos, ypos, width, height,
 515                         0, visinfo->depth, InputOutput,
 516                         visinfo->visual, mask, &attr);
 517    if (!win) {
 518       Error("Couldn't create window");
 519    }
 520
 521    XFree(visinfo);
 522
 523    {
 524       XSizeHints sizehints;
 525       sizehints.x = xpos;
 526       sizehints.y = ypos;
 527       sizehints.width  = width;
 528       sizehints.height = height;
 529       sizehints.flags = USSize | USPosition;
 530       XSetNormalHints(wt->Dpy, win, &sizehints);
 531       XSetStandardProperties(wt->Dpy, win, "xeglthreads", "xeglthreads",
 532                               None, (char **)NULL, 0, &sizehints);
 533    }
 534
 535    eglBindAPI(EGL_OPENGL_API);
 536
 537    ctx = eglCreateContext(wt->Display, config, shareCtx, NULL);
 538    if (!ctx) {
 539       Error("Couldn't create EGL context");
 540    }
 541    surf = eglCreateWindowSurface(wt->Display, config, win, NULL);
 542    if (!surf) {
 543       Error("Couldn't create EGL surface");
 544    }
 545
 546    XMapWindow(wt->Dpy, win);
 547    XSync(wt->Dpy, 0);
 548
 549    /* save the info for this window/context */
 550    wt->Win = win;
 551    wt->Context = ctx;
 552    wt->Surface = surf;
 553    wt->Angle = 0.0;
 554    wt->WinWidth = width;
 555    wt->WinHeight = height;
 556    wt->NewSize = GL_TRUE;
 557 }
 558
 559
 560 /*
 561  * Called by pthread_create()
 562  */
 563 static void *
 564 thread_function(void *p)
 565 {
 566    struct winthread *wt = (struct winthread *) p;
 567    draw_loop(wt);
 568    return NULL;
 569 }
 570
 571
 572 /*
 573  * called before exit to wait for all threads to finish
 574  */
 575 static void
 576 clean_up(void)
 577 {
 578    int i;
 579
 580    /* wait for threads to finish */
 581    for (i = 0; i < NumWinThreads; i++) {
 582       pthread_join(WinThreads[i].Thread, NULL);
 583    }
 584
 585    for (i = 0; i < NumWinThreads; i++) {
 586       eglDestroyContext(WinThreads[i].Display, WinThreads[i].Context);
 587       XDestroyWindow(WinThreads[i].Dpy, WinThreads[i].Win);
 588    }
 589 }
 590
 591
 592 static void
 593 usage(void)
 594 {
 595    printf("xeglthreads: test of EGL/GL thread safety (any key = exit)\n");
 596    printf("Usage:\n");
 597    printf("  xeglthreads [options]\n");
 598    printf("Options:\n");
 599    printf("   -display DISPLAYNAME  Specify display string\n");
 600    printf("   -n NUMTHREADS  Number of threads to create\n");
 601    printf("   -p  Use a separate display connection for each thread\n");
 602    printf("   -l  Use application-side locking\n");
 603    printf("   -t  Enable texturing\n");
 604    printf("Keyboard:\n");
 605    printf("   Esc  Exit\n");
 606    printf("   t    Change texture image (requires -t option)\n");
 607    printf("   a    Toggle animation\n");
 608    printf("   s    Step rotation (when not animating)\n");
 609 }
 610
 611
 612 int
 613 main(int argc, char *argv[])
 614 {
 615    char *displayName = NULL;
 616    int numThreads = 2;
 617    Display *dpy = NULL;
 618    EGLDisplay *egl_dpy = NULL;
 619    int i;
 620    Status threadStat;
 621
 622    if (argc == 1) {
 623       usage();
 624    }
 625    else {
 626       int i;
 627       for (i = 1; i < argc; i++) {
 628          if (strcmp(argv[i], "-display") == 0 && i + 1 < argc) {
 629             displayName = argv[i + 1];
 630             i++;
 631          }
 632          else if (strcmp(argv[i], "-p") == 0) {
 633             MultiDisplays = 1;
 634          }
 635          else if (strcmp(argv[i], "-l") == 0) {
 636             Locking = 1;
 637          }
 638          else if (strcmp(argv[i], "-t") == 0) {
 639             Texture = 1;
 640          }
 641          else if (strcmp(argv[i], "-n") == 0 && i + 1 < argc) {
 642             numThreads = atoi(argv[i + 1]);
 643             if (numThreads < 1)
 644                numThreads = 1;
 645             else if (numThreads > MAX_WINTHREADS)
 646                numThreads = MAX_WINTHREADS;
 647             i++;
 648          }
 649          else {
 650             usage();
 651             exit(1);
 652          }
 653       }
 654    }
 655
 656    if (Locking)
 657       printf("xeglthreads: Using explicit locks around Xlib calls.\n");
 658    else
 659       printf("xeglthreads: No explict locking.\n");
 660
 661    if (MultiDisplays)
 662       printf("xeglthreads: Per-thread display connections.\n");
 663    else
 664       printf("xeglthreads: Single display connection.\n");
 665
 666    /*
 667     * VERY IMPORTANT: call XInitThreads() before any other Xlib functions.
 668     */
 669    if (!MultiDisplays) {
 670        if (!Locking) {
 671            threadStat = XInitThreads();
 672            if (threadStat) {
 673                printf("XInitThreads() returned %d (success)\n",
 674                       (int) threadStat);
 675            }
 676            else {
 677                printf("XInitThreads() returned 0 "
 678                       "(failure- this program may fail)\n");
 679            }
 680        }
 681
 682       dpy = XOpenDisplay(displayName);
 683       if (!dpy) {
 684          fprintf(stderr, "Unable to open display %s\n",
 685                  XDisplayName(displayName));
 686          return -1;
 687       }
 688       egl_dpy = eglGetDisplay(dpy);
 689       if (!egl_dpy) {
 690          fprintf(stderr, "Unable to get EGL display\n");
 691          XCloseDisplay(dpy);
 692          return -1;
 693       }
 694       if (!eglInitialize(egl_dpy, NULL, NULL)) {
 695           fprintf(stderr, "Unable to initialize EGL display\n");
 696           return -1;
 697       }
 698    }
 699
 700    pthread_mutex_init(&Mutex, NULL);
 701    pthread_mutex_init(&CondMutex, NULL);
 702    pthread_cond_init(&CondVar, NULL);
 703
 704    printf("xeglthreads: creating windows\n");
 705
 706    NumWinThreads = numThreads;
 707
 708    /* Create the EGL windows and contexts */
 709    for (i = 0; i < numThreads; i++) {
 710       EGLContext share;
 711
 712       if (MultiDisplays) {
 713          WinThreads[i].Dpy = XOpenDisplay(displayName);
 714          assert(WinThreads[i].Dpy);
 715          WinThreads[i].Display = eglGetDisplay(WinThreads[i].Dpy);
 716          assert(eglInitialize(WinThreads[i].Display, NULL, NULL));
 717       }
 718       else {
 719          WinThreads[i].Dpy = dpy;
 720          WinThreads[i].Display = egl_dpy;
 721       }
 722       WinThreads[i].Index = i;
 723       WinThreads[i].Initialized = GL_FALSE;
 724
 725       share = (Texture && i > 0) ? WinThreads[0].Context : 0;
 726
 727       create_window(&WinThreads[i], share);
 728    }
 729
 730    printf("xeglthreads: creating threads\n");
 731
 732    /* Create the threads */
 733    for (i = 0; i < numThreads; i++) {
 734       pthread_create(&WinThreads[i].Thread, NULL, thread_function,
 735                      (void*) &WinThreads[i]);
 736       printf("xeglthreads: Created thread %p\n",
 737               (void *) WinThreads[i].Thread);
 738    }
 739
 740    if (MultiDisplays)
 741       event_loop_multi();
 742    else
 743       event_loop(dpy);
 744
 745    clean_up();
 746
 747    if (MultiDisplays) {
 748       for (i = 0; i < numThreads; i++) {
 749           eglTerminate(WinThreads[i].Display);
 750           XCloseDisplay(WinThreads[i].Dpy);
 751       }
 752    }
 753    else {
 754       eglTerminate(egl_dpy);
 755       XCloseDisplay(dpy);
 756    }
 757
 758    return 0;
 759 }
 760
 761
 762 #else /* PTHREADS */
 763
 764
 765 #include <stdio.h>
 766
 767 int
 768 main(int argc, char *argv[])
 769 {
 770    printf("Sorry, this program wasn't compiled with PTHREADS defined.\n");
 771    return 0;
 772 }
 773
 774
 775 #endif /* PTHREADS */