progs/egl/xeglgears.c

   1 /*
   2  * Copyright (C) 1999-2001  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
  22 /*
  23  * Ported to X/EGL/GLES.   XXX Actually, uses full OpenGL ATM.
  24  * Brian Paul
  25  * 30 May 2008
  26  */
  27
  28 /*
  29  * Command line options:
  30  *    -info      print GL implementation information
  31  *
  32  */
  33
  34
  35 #include <math.h>
  36 #include <stdlib.h>
  37 #include <stdio.h>
  38 #include <string.h>
  39 #include <X11/Xlib.h>
  40 #include <X11/Xutil.h>
  41 #include <X11/keysym.h>
  42 #include <GL/gl.h>
  43 #include <EGL/egl.h>
  44
  45
  46 #define BENCHMARK
  47
  48 #ifdef BENCHMARK
  49
  50 /* XXX this probably isn't very portable */
  51
  52 #include <sys/time.h>
  53 #include <unistd.h>
  54
  55 /* return current time (in seconds) */
  56 static double
  57 current_time(void)
  58 {
  59    struct timeval tv;
  60 #ifdef __VMS
  61    (void) gettimeofday(&tv, NULL );
  62 #else
  63    struct timezone tz;
  64    (void) gettimeofday(&tv, &tz);
  65 #endif
  66    return (double) tv.tv_sec + tv.tv_usec / 1000000.0;
  67 }
  68
  69 #else /*BENCHMARK*/
  70
  71 /* dummy */
  72 static double
  73 current_time(void)
  74 {
  75    /* update this function for other platforms! */
  76    static double t = 0.0;
  77    static int warn = 1;
  78    if (warn) {
  79       fprintf(stderr, "Warning: current_time() not implemented!!\n");
  80       warn = 0;
  81    }
  82    return t += 1.0;
  83 }
  84
  85 #endif /*BENCHMARK*/
  86
  87
  88
  89 #ifndef M_PI
  90 #define M_PI 3.14159265
  91 #endif
  92
  93
  94 static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
  95 static GLint gear1, gear2, gear3;
  96 static GLfloat angle = 0.0;
  97
  98 static GLboolean fullscreen = GL_FALSE; /* Create a single fullscreen window */
  99
 100
 101 /*
 102  *
 103  *  Draw a gear wheel.  You'll probably want to call this function when
 104  *  building a display list since we do a lot of trig here.
 105  *
 106  *  Input:  inner_radius - radius of hole at center
 107  *          outer_radius - radius at center of teeth
 108  *          width - width of gear
 109  *          teeth - number of teeth
 110  *          tooth_depth - depth of tooth
 111  */
 112 static void
 113 gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
 114      GLint teeth, GLfloat tooth_depth)
 115 {
 116    GLint i;
 117    GLfloat r0, r1, r2;
 118    GLfloat angle, da;
 119    GLfloat u, v, len;
 120
 121    r0 = inner_radius;
 122    r1 = outer_radius - tooth_depth / 2.0;
 123    r2 = outer_radius + tooth_depth / 2.0;
 124
 125    da = 2.0 * M_PI / teeth / 4.0;
 126
 127    glShadeModel(GL_FLAT);
 128
 129    glNormal3f(0.0, 0.0, 1.0);
 130
 131    /* draw front face */
 132    glBegin(GL_QUAD_STRIP);
 133    for (i = 0; i <= teeth; i++) {
 134       angle = i * 2.0 * M_PI / teeth;
 135       glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
 136       glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
 137       if (i < teeth) {
 138          glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
 139          glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
 140                     width * 0.5);
 141       }
 142    }
 143    glEnd();
 144
 145    /* draw front sides of teeth */
 146    glBegin(GL_QUADS);
 147    da = 2.0 * M_PI / teeth / 4.0;
 148    for (i = 0; i < teeth; i++) {
 149       angle = i * 2.0 * M_PI / teeth;
 150
 151       glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
 152       glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
 153       glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
 154                  width * 0.5);
 155       glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
 156                  width * 0.5);
 157    }
 158    glEnd();
 159
 160    glNormal3f(0.0, 0.0, -1.0);
 161
 162    /* draw back face */
 163    glBegin(GL_QUAD_STRIP);
 164    for (i = 0; i <= teeth; i++) {
 165       angle = i * 2.0 * M_PI / teeth;
 166       glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
 167       glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
 168       if (i < teeth) {
 169          glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
 170                     -width * 0.5);
 171          glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
 172       }
 173    }
 174    glEnd();
 175
 176    /* draw back sides of teeth */
 177    glBegin(GL_QUADS);
 178    da = 2.0 * M_PI / teeth / 4.0;
 179    for (i = 0; i < teeth; i++) {
 180       angle = i * 2.0 * M_PI / teeth;
 181
 182       glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
 183                  -width * 0.5);
 184       glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
 185                  -width * 0.5);
 186       glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
 187       glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
 188    }
 189    glEnd();
 190
 191    /* draw outward faces of teeth */
 192    glBegin(GL_QUAD_STRIP);
 193    for (i = 0; i < teeth; i++) {
 194       angle = i * 2.0 * M_PI / teeth;
 195
 196       glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
 197       glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
 198       u = r2 * cos(angle + da) - r1 * cos(angle);
 199       v = r2 * sin(angle + da) - r1 * sin(angle);
 200       len = sqrt(u * u + v * v);
 201       u /= len;
 202       v /= len;
 203       glNormal3f(v, -u, 0.0);
 204       glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
 205       glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
 206       glNormal3f(cos(angle), sin(angle), 0.0);
 207       glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
 208                  width * 0.5);
 209       glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
 210                  -width * 0.5);
 211       u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da);
 212       v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da);
 213       glNormal3f(v, -u, 0.0);
 214       glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
 215                  width * 0.5);
 216       glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
 217                  -width * 0.5);
 218       glNormal3f(cos(angle), sin(angle), 0.0);
 219    }
 220
 221    glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5);
 222    glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5);
 223
 224    glEnd();
 225
 226    glShadeModel(GL_SMOOTH);
 227
 228    /* draw inside radius cylinder */
 229    glBegin(GL_QUAD_STRIP);
 230    for (i = 0; i <= teeth; i++) {
 231       angle = i * 2.0 * M_PI / teeth;
 232       glNormal3f(-cos(angle), -sin(angle), 0.0);
 233       glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
 234       glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
 235    }
 236    glEnd();
 237 }
 238
 239
 240 static void
 241 draw(void)
 242 {
 243    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 244
 245    glPushMatrix();
 246    glRotatef(view_rotx, 1.0, 0.0, 0.0);
 247    glRotatef(view_roty, 0.0, 1.0, 0.0);
 248    glRotatef(view_rotz, 0.0, 0.0, 1.0);
 249
 250    glPushMatrix();
 251    glTranslatef(-3.0, -2.0, 0.0);
 252    glRotatef(angle, 0.0, 0.0, 1.0);
 253    glCallList(gear1);
 254    glPopMatrix();
 255
 256    glPushMatrix();
 257    glTranslatef(3.1, -2.0, 0.0);
 258    glRotatef(-2.0 * angle - 9.0, 0.0, 0.0, 1.0);
 259    glCallList(gear2);
 260    glPopMatrix();
 261
 262    glPushMatrix();
 263    glTranslatef(-3.1, 4.2, 0.0);
 264    glRotatef(-2.0 * angle - 25.0, 0.0, 0.0, 1.0);
 265    glCallList(gear3);
 266    glPopMatrix();
 267
 268    glPopMatrix();
 269 }
 270
 271
 272 /* new window size or exposure */
 273 static void
 274 reshape(int width, int height)
 275 {
 276    GLfloat ar = (GLfloat) width / (GLfloat) height;
 277
 278    glViewport(0, 0, (GLint) width, (GLint) height);
 279
 280    glMatrixMode(GL_PROJECTION);
 281    glLoadIdentity();
 282    glFrustum(-ar, ar, -1, 1, 5.0, 60.0);
 283
 284    glMatrixMode(GL_MODELVIEW);
 285    glLoadIdentity();
 286    glTranslatef(0.0, 0.0, -40.0);
 287 }
 288
 289
 290
 291 static void
 292 init(void)
 293 {
 294    static GLfloat pos[4] = { 5.0, 5.0, 10.0, 0.0 };
 295    static GLfloat red[4] = { 0.8, 0.1, 0.0, 1.0 };
 296    static GLfloat green[4] = { 0.0, 0.8, 0.2, 1.0 };
 297    static GLfloat blue[4] = { 0.2, 0.2, 1.0, 1.0 };
 298
 299    glLightfv(GL_LIGHT0, GL_POSITION, pos);
 300    glEnable(GL_CULL_FACE);
 301    glEnable(GL_LIGHTING);
 302    glEnable(GL_LIGHT0);
 303    glEnable(GL_DEPTH_TEST);
 304
 305    /* make the gears */
 306    gear1 = glGenLists(1);
 307    glNewList(gear1, GL_COMPILE);
 308    glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
 309    gear(1.0, 4.0, 1.0, 20, 0.7);
 310    glEndList();
 311
 312    gear2 = glGenLists(1);
 313    glNewList(gear2, GL_COMPILE);
 314    glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
 315    gear(0.5, 2.0, 2.0, 10, 0.7);
 316    glEndList();
 317
 318    gear3 = glGenLists(1);
 319    glNewList(gear3, GL_COMPILE);
 320    glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
 321    gear(1.3, 2.0, 0.5, 10, 0.7);
 322    glEndList();
 323
 324    glEnable(GL_NORMALIZE);
 325
 326    glClearColor(0.2, 0.2, 0.2, 0.0);
 327 }
 328
 329
 330 /*
 331  * Create an RGB, double-buffered X window.
 332  * Return the window and context handles.
 333  */
 334 static void
 335 make_x_window(Display *x_dpy, EGLDisplay egl_dpy,
 336               const char *name,
 337               int x, int y, int width, int height,
 338               Window *winRet,
 339               EGLContext *ctxRet,
 340               EGLSurface *surfRet)
 341 {
 342    static const EGLint attribs[] = {
 343       EGL_RED_SIZE, 1,
 344       EGL_GREEN_SIZE, 1,
 345       EGL_BLUE_SIZE, 1,
 346       /*EGL_DOUBLEBUFFER,*/
 347       EGL_DEPTH_SIZE, 1,
 348       EGL_NONE
 349    };
 350
 351    int scrnum;
 352    XSetWindowAttributes attr;
 353    unsigned long mask;
 354    Window root;
 355    Window win;
 356    XVisualInfo *visInfo, visTemplate;
 357    int num_visuals;
 358    EGLContext ctx;
 359    EGLConfig config;
 360    EGLint num_configs;
 361
 362    scrnum = DefaultScreen( x_dpy );
 363    root = RootWindow( x_dpy, scrnum );
 364
 365    if (fullscreen) {
 366       x = 0; y = 0;
 367       width = DisplayWidth( x_dpy, scrnum );
 368       height = DisplayHeight( x_dpy, scrnum );
 369    }
 370
 371    if (!eglChooseConfig( egl_dpy, attribs, &config, 1, &num_configs)) {
 372       printf("Error: couldn't get an EGL visual config\n");
 373       exit(1);
 374    }
 375
 376    /* choose X window visual similar to EGL config */
 377    visTemplate.screen = DefaultScreen(x_dpy);
 378    visTemplate.depth = 32; /* 24? */
 379    visInfo = XGetVisualInfo(x_dpy,
 380                             (VisualDepthMask | VisualScreenMask),
 381                             &visTemplate, &num_visuals);
 382    if (!visInfo) {
 383       printf("Error: couldn't get X visual\n");
 384       exit(1);
 385    }
 386
 387    /* window attributes */
 388    attr.background_pixel = 0;
 389    attr.border_pixel = 0;
 390    attr.colormap = XCreateColormap( x_dpy, root, visInfo->visual, AllocNone);
 391    attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
 392    attr.override_redirect = fullscreen;
 393    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask | CWOverrideRedirect;
 394
 395    win = XCreateWindow( x_dpy, root, 0, 0, width, height,
 396                         0, visInfo->depth, InputOutput,
 397                         visInfo->visual, mask, &attr );
 398
 399    /* set hints and properties */
 400    {
 401       XSizeHints sizehints;
 402       sizehints.x = x;
 403       sizehints.y = y;
 404       sizehints.width  = width;
 405       sizehints.height = height;
 406       sizehints.flags = USSize | USPosition;
 407       XSetNormalHints(x_dpy, win, &sizehints);
 408       XSetStandardProperties(x_dpy, win, name, name,
 409                               None, (char **)NULL, 0, &sizehints);
 410    }
 411
 412    eglBindAPI(EGL_OPENGL_API);
 413
 414    ctx = eglCreateContext(egl_dpy, config, EGL_NO_CONTEXT, NULL );
 415    if (!ctx) {
 416       printf("Error: glXCreateContext failed\n");
 417       exit(1);
 418    }
 419
 420    *surfRet = eglCreateWindowSurface(egl_dpy, config, win, NULL);
 421
 422    XFree(visInfo);
 423
 424    *winRet = win;
 425    *ctxRet = ctx;
 426 }
 427
 428
 429 static void
 430 event_loop(Display *dpy, Window win,
 431            EGLDisplay egl_dpy, EGLSurface egl_surf)
 432 {
 433    while (1) {
 434       while (XPending(dpy) > 0) {
 435          XEvent event;
 436          XNextEvent(dpy, &event);
 437          switch (event.type) {
 438          case Expose:
 439             /* we'll redraw below */
 440             break;
 441          case ConfigureNotify:
 442             reshape(event.xconfigure.width, event.xconfigure.height);
 443             break;
 444          case KeyPress:
 445             {
 446                char buffer[10];
 447                int r, code;
 448                code = XLookupKeysym(&event.xkey, 0);
 449                if (code == XK_Left) {
 450                   view_roty += 5.0;
 451                }
 452                else if (code == XK_Right) {
 453                   view_roty -= 5.0;
 454                }
 455                else if (code == XK_Up) {
 456                   view_rotx += 5.0;
 457                }
 458                else if (code == XK_Down) {
 459                   view_rotx -= 5.0;
 460                }
 461                else {
 462                   r = XLookupString(&event.xkey, buffer, sizeof(buffer),
 463                                     NULL, NULL);
 464                   if (buffer[0] == 27) {
 465                      /* escape */
 466                      return;
 467                   }
 468                }
 469             }
 470          }
 471       }
 472
 473       {
 474          static int frames = 0;
 475          static double tRot0 = -1.0, tRate0 = -1.0;
 476          double dt, t = current_time();
 477          if (tRot0 < 0.0)
 478             tRot0 = t;
 479          dt = t - tRot0;
 480          tRot0 = t;
 481
 482          /* advance rotation for next frame */
 483          angle += 70.0 * dt;  /* 70 degrees per second */
 484          if (angle > 3600.0)
 485              angle -= 3600.0;
 486
 487          draw();
 488          eglSwapBuffers(egl_dpy, egl_surf);
 489
 490          frames++;
 491
 492          if (tRate0 < 0.0)
 493             tRate0 = t;
 494          if (t - tRate0 >= 5.0) {
 495             GLfloat seconds = t - tRate0;
 496             GLfloat fps = frames / seconds;
 497             printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds,
 498                    fps);
 499             tRate0 = t;
 500             frames = 0;
 501          }
 502       }
 503    }
 504 }
 505
 506
 507 static void
 508 usage(void)
 509 {
 510    printf("Usage:\n");
 511    printf("  -display <displayname>  set the display to run on\n");
 512    printf("  -fullscreen             run in fullscreen mode\n");
 513    printf("  -info                   display OpenGL renderer info\n");
 514 }
 515
 516
 517 int
 518 main(int argc, char *argv[])
 519 {
 520    const int winWidth = 300, winHeight = 300;
 521    Display *x_dpy;
 522    Window win;
 523    EGLSurface egl_surf;
 524    EGLContext egl_ctx;
 525    EGLDisplay egl_dpy;
 526    char *dpyName = NULL;
 527    GLboolean printInfo = GL_FALSE;
 528    EGLint egl_major, egl_minor;
 529    int i;
 530    const char *s;
 531
 532    for (i = 1; i < argc; i++) {
 533       if (strcmp(argv[i], "-display") == 0) {
 534          dpyName = argv[i+1];
 535          i++;
 536       }
 537       else if (strcmp(argv[i], "-info") == 0) {
 538          printInfo = GL_TRUE;
 539       }
 540       else if (strcmp(argv[i], "-fullscreen") == 0) {
 541          fullscreen = GL_TRUE;
 542       }
 543       else {
 544          usage();
 545          return -1;
 546       }
 547    }
 548
 549    x_dpy = XOpenDisplay(dpyName);
 550    if (!x_dpy) {
 551       printf("Error: couldn't open display %s\n",
 552              dpyName ? dpyName : getenv("DISPLAY"));
 553       return -1;
 554    }
 555
 556    egl_dpy = eglGetDisplay(x_dpy);
 557    if (!egl_dpy) {
 558       printf("Error: eglGetDisplay() failed\n");
 559       return -1;
 560    }
 561
 562    if (!eglInitialize(egl_dpy, &egl_major, &egl_minor)) {
 563       printf("Error: eglInitialize() failed\n");
 564       return -1;
 565    }
 566
 567    s = eglQueryString(egl_dpy, EGL_VERSION);
 568    printf("EGL_VERSION = %s\n", s);
 569
 570    make_x_window(x_dpy, egl_dpy,
 571                  "glxgears", 0, 0, winWidth, winHeight,
 572                  &win, &egl_ctx, &egl_surf);
 573
 574    XMapWindow(x_dpy, win);
 575    eglMakeCurrent(egl_dpy, egl_surf, egl_surf, egl_ctx);
 576
 577    if (printInfo) {
 578       printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 579       printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 580       printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 581    }
 582
 583    init();
 584
 585    /* Set initial projection/viewing transformation.
 586     * We can't be sure we'll get a ConfigureNotify event when the window
 587     * first appears.
 588     */
 589    reshape(winWidth, winHeight);
 590
 591    event_loop(x_dpy, win, egl_dpy, egl_surf);
 592
 593    glDeleteLists(gear1, 1);
 594    glDeleteLists(gear2, 1);
 595    glDeleteLists(gear3, 1);
 596
 597    eglDestroyContext(egl_dpy, egl_ctx);
 598    eglDestroySurface(egl_dpy, egl_surf);
 599    eglTerminate(egl_dpy);
 600
 601
 602    XDestroyWindow(x_dpy, win);
 603    XCloseDisplay(x_dpy);
 604
 605    return 0;
 606 }