src/egl/eglgears.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  * This is a port of the infamous "glxgears" demo to straight EGL
  24  * Port by Dane Rushton 10 July 2005
  25  *
  26  * No command line options.
  27  * Program runs for 5 seconds then exits, outputing framerate to console
  28  */
  29
  30 #include <math.h>
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <GL/gl.h>
  35 #include <GLES/egl.h>
  36 #include <assert.h>
  37
  38 #define MAX_CONFIGS 10
  39 #define MAX_MODES 100
  40
  41 #define BENCHMARK
  42
  43 #ifdef BENCHMARK
  44
  45 /* XXX this probably isn't very portable */
  46
  47 #include <sys/time.h>
  48 #include <unistd.h>
  49
  50 /* return current time (in seconds) */
  51 static double
  52 current_time(void)
  53 {
  54    struct timeval tv;
  55 #ifdef __VMS
  56    (void) gettimeofday(&tv, NULL );
  57 #else
  58    struct timezone tz;
  59    (void) gettimeofday(&tv, &tz);
  60 #endif
  61    return (double) tv.tv_sec + tv.tv_usec / 1000000.0;
  62 }
  63
  64 #else /*BENCHMARK*/
  65
  66 /* dummy */
  67 static double
  68 current_time(void)
  69 {
  70    /* update this function for other platforms! */
  71    static double t = 0.0;
  72    static int warn = 1;
  73    if (warn) {
  74       fprintf(stderr, "Warning: current_time() not implemented!!\n");
  75       warn = 0;
  76    }
  77    return t += 1.0;
  78 }
  79
  80 #endif /*BENCHMARK*/
  81
  82
  83 #ifndef M_PI
  84 #define M_PI 3.14159265
  85 #endif
  86
  87
  88 static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
  89 static GLint gear1, gear2, gear3;
  90 static GLfloat angle = 0.0;
  91
  92 #if 0
  93 static GLfloat eyesep = 5.0;            /* Eye separation. */
  94 static GLfloat fix_point = 40.0;        /* Fixation point distance.  */
  95 static GLfloat left, right, asp;        /* Stereo frustum params.  */
  96 #endif
  97
  98
  99 /*
 100  *
 101  *  Draw a gear wheel.  You'll probably want to call this function when
 102  *  building a display list since we do a lot of trig here.
 103  *
 104  *  Input:  inner_radius - radius of hole at center
 105  *          outer_radius - radius at center of teeth
 106  *          width - width of gear
 107  *          teeth - number of teeth
 108  *          tooth_depth - depth of tooth
 109  */
 110 static void
 111 gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
 112      GLint teeth, GLfloat tooth_depth)
 113 {
 114    GLint i;
 115    GLfloat r0, r1, r2;
 116    GLfloat angle, da;
 117    GLfloat u, v, len;
 118
 119    r0 = inner_radius;
 120    r1 = outer_radius - tooth_depth / 2.0;
 121    r2 = outer_radius + tooth_depth / 2.0;
 122
 123    da = 2.0 * M_PI / teeth / 4.0;
 124
 125    glShadeModel(GL_FLAT);
 126
 127    glNormal3f(0.0, 0.0, 1.0);
 128
 129    /* draw front face */
 130    glBegin(GL_QUAD_STRIP);
 131    for (i = 0; i <= teeth; i++) {
 132       angle = i * 2.0 * M_PI / teeth;
 133       glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
 134       glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
 135       if (i < teeth) {
 136          glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
 137          glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
 138                     width * 0.5);
 139       }
 140    }
 141    glEnd();
 142
 143    /* draw front sides of teeth */
 144    glBegin(GL_QUADS);
 145    da = 2.0 * M_PI / teeth / 4.0;
 146    for (i = 0; i < teeth; i++) {
 147       angle = i * 2.0 * M_PI / teeth;
 148
 149       glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
 150       glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
 151       glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
 152                  width * 0.5);
 153       glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
 154                  width * 0.5);
 155    }
 156    glEnd();
 157
 158    glNormal3f(0.0, 0.0, -1.0);
 159
 160    /* draw back face */
 161    glBegin(GL_QUAD_STRIP);
 162    for (i = 0; i <= teeth; i++) {
 163       angle = i * 2.0 * M_PI / teeth;
 164       glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
 165       glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
 166       if (i < teeth) {
 167          glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
 168                     -width * 0.5);
 169          glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
 170       }
 171    }
 172    glEnd();
 173
 174    /* draw back sides of teeth */
 175    glBegin(GL_QUADS);
 176    da = 2.0 * M_PI / teeth / 4.0;
 177    for (i = 0; i < teeth; i++) {
 178       angle = i * 2.0 * M_PI / teeth;
 179
 180       glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
 181                  -width * 0.5);
 182       glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
 183                  -width * 0.5);
 184       glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
 185       glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
 186    }
 187    glEnd();
 188
 189    /* draw outward faces of teeth */
 190    glBegin(GL_QUAD_STRIP);
 191    for (i = 0; i < teeth; i++) {
 192       angle = i * 2.0 * M_PI / teeth;
 193
 194       glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
 195       glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
 196       u = r2 * cos(angle + da) - r1 * cos(angle);
 197       v = r2 * sin(angle + da) - r1 * sin(angle);
 198       len = sqrt(u * u + v * v);
 199       u /= len;
 200       v /= len;
 201       glNormal3f(v, -u, 0.0);
 202       glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
 203       glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
 204       glNormal3f(cos(angle), sin(angle), 0.0);
 205       glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
 206                  width * 0.5);
 207       glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
 208                  -width * 0.5);
 209       u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da);
 210       v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da);
 211       glNormal3f(v, -u, 0.0);
 212       glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
 213                  width * 0.5);
 214       glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
 215                  -width * 0.5);
 216       glNormal3f(cos(angle), sin(angle), 0.0);
 217    }
 218
 219    glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5);
 220    glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5);
 221
 222    glEnd();
 223
 224    glShadeModel(GL_SMOOTH);
 225
 226    /* draw inside radius cylinder */
 227    glBegin(GL_QUAD_STRIP);
 228    for (i = 0; i <= teeth; i++) {
 229       angle = i * 2.0 * M_PI / teeth;
 230       glNormal3f(-cos(angle), -sin(angle), 0.0);
 231       glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
 232       glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
 233    }
 234    glEnd();
 235 }
 236
 237
 238 static void
 239 draw(void)
 240 {
 241    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 242
 243    glPushMatrix();
 244    glRotatef(view_rotx, 1.0, 0.0, 0.0);
 245    glRotatef(view_roty, 0.0, 1.0, 0.0);
 246    glRotatef(view_rotz, 0.0, 0.0, 1.0);
 247
 248    glPushMatrix();
 249    glTranslatef(-3.0, -2.0, 0.0);
 250    glRotatef(angle, 0.0, 0.0, 1.0);
 251    glCallList(gear1);
 252    glPopMatrix();
 253
 254    glPushMatrix();
 255    glTranslatef(3.1, -2.0, 0.0);
 256    glRotatef(-2.0 * angle - 9.0, 0.0, 0.0, 1.0);
 257    glCallList(gear2);
 258    glPopMatrix();
 259
 260    glPushMatrix();
 261    glTranslatef(-3.1, 4.2, 0.0);
 262    glRotatef(-2.0 * angle - 25.0, 0.0, 0.0, 1.0);
 263    glCallList(gear3);
 264    glPopMatrix();
 265
 266    glPopMatrix();
 267 }
 268
 269
 270 /* new window size or exposure */
 271 static void
 272 reshape(int width, int height)
 273 {
 274    glViewport(0, 0, (GLint) width, (GLint) height);
 275
 276    GLfloat h = (GLfloat) height / (GLfloat) width;
 277
 278    glMatrixMode(GL_PROJECTION);
 279    glLoadIdentity();
 280    glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
 281
 282    glMatrixMode(GL_MODELVIEW);
 283    glLoadIdentity();
 284    glTranslatef(0.0, 0.0, -40.0);
 285 }
 286
 287
 288
 289 static void
 290 init(void)
 291 {
 292    static GLfloat pos[4] = { 5.0, 5.0, 10.0, 0.0 };
 293    static GLfloat red[4] = { 0.8, 0.1, 0.0, 1.0 };
 294    static GLfloat green[4] = { 0.0, 0.8, 0.2, 1.0 };
 295    static GLfloat blue[4] = { 0.2, 0.2, 1.0, 1.0 };
 296
 297    glLightfv(GL_LIGHT0, GL_POSITION, pos);
 298    glEnable(GL_CULL_FACE);
 299    glEnable(GL_LIGHTING);
 300    glEnable(GL_LIGHT0);
 301    glEnable(GL_DEPTH_TEST);
 302
 303    /* make the gears */
 304    gear1 = glGenLists(1);
 305    glNewList(gear1, GL_COMPILE);
 306    glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
 307    gear(1.0, 4.0, 1.0, 20, 0.7);
 308    glEndList();
 309
 310    gear2 = glGenLists(1);
 311    glNewList(gear2, GL_COMPILE);
 312    glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
 313    gear(0.5, 2.0, 2.0, 10, 0.7);
 314    glEndList();
 315
 316    gear3 = glGenLists(1);
 317    glNewList(gear3, GL_COMPILE);
 318    glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
 319    gear(1.3, 2.0, 0.5, 10, 0.7);
 320    glEndList();
 321
 322    glEnable(GL_NORMALIZE);
 323 }
 324
 325
 326
 327
 328 static void run_gears(EGLDisplay dpy, EGLSurface surf, int ttr)
 329 {
 330         double st = current_time();
 331         double ct = st;
 332         int frames = 0;
 333         while (ct - st < ttr)
 334         {
 335                 double tt = current_time();
 336                 double dt = tt - ct;
 337                 ct = tt;
 338
 339                 /* advance rotation for next frame */
 340                 angle += 70.0 * dt;  /* 70 degrees per second */
 341                 if (angle > 3600.0)
 342                         angle -= 3600.0;
 343
 344                 draw();
 345
 346                 eglSwapBuffers(dpy, surf);
 347
 348
 349                 frames++;
 350         }
 351
 352         GLfloat seconds = ct - st;
 353         GLfloat fps = frames / seconds;
 354         printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds, fps);
 355
 356 }
 357
 358
 359 int
 360 main(int argc, char *argv[])
 361 {
 362         int maj, min;
 363         EGLContext ctx;
 364         EGLSurface screen_surf;
 365         EGLConfig configs[MAX_CONFIGS];
 366         EGLint numConfigs, i;
 367         EGLBoolean b;
 368         EGLDisplay d;
 369         EGLint screenAttribs[10];
 370         EGLModeMESA mode[MAX_MODES];
 371         EGLScreenMESA screen;
 372         EGLint count, chosenMode;
 373         GLboolean printInfo = GL_FALSE;
 374         EGLint width = 0, height = 0;
 375
 376         /* parse cmd line args */
 377         for (i = 1; i < argc; i++)
 378         {
 379                 if (strcmp(argv[i], "-info") == 0)
 380                 {
 381                         printInfo = GL_TRUE;
 382                 }
 383                 else
 384                         printf("Warning: unknown parameter: %s\n", argv[i]);
 385         }
 386
 387         /* DBR : Create EGL context/surface etc */
 388         d = eglGetDisplay(":0");
 389         assert(d);
 390
 391         if (!eglInitialize(d, &maj, &min)) {
 392                 printf("eglgears: eglInitialize failed\n");
 393                 exit(1);
 394         }
 395
 396         printf("eglgears: EGL version = %d.%d\n", maj, min);
 397         printf("eglgears: EGL_VENDOR = %s\n", eglQueryString(d, EGL_VENDOR));
 398
 399         /* XXX use ChooseConfig */
 400         eglGetConfigs(d, configs, MAX_CONFIGS, &numConfigs);
 401         eglGetScreensMESA(d, &screen, 1, &count);
 402
 403         if (!eglGetModesMESA(d, screen, mode, MAX_MODES, &count) || count == 0) {
 404                 printf("eglgears: eglGetModesMESA failed!\n");
 405                 return 0;
 406         }
 407
 408         /* Print list of modes, and find the one to use */
 409         printf("eglgears: Found %d modes:\n", count);
 410         for (i = 0; i < count; i++) {
 411                 EGLint w, h;
 412                 eglGetModeAttribMESA(d, mode[i], EGL_WIDTH, &w);
 413                 eglGetModeAttribMESA(d, mode[i], EGL_HEIGHT, &h);
 414                 printf("%3d: %d x %d\n", i, w, h);
 415                 if (w > width && h > height && w <= 1280 && h <= 1024) {
 416                         width = w;
 417                         height = h;
 418                         chosenMode = i;
 419                 }
 420         }
 421         printf("eglgears: Using screen mode/size %d: %d x %d\n", chosenMode, width, height);
 422
 423         ctx = eglCreateContext(d, configs[0], EGL_NO_CONTEXT, NULL);
 424         if (ctx == EGL_NO_CONTEXT) {
 425                 printf("eglgears: failed to create context\n");
 426                 return 0;
 427         }
 428
 429         /* build up screenAttribs array */
 430         i = 0;
 431         screenAttribs[i++] = EGL_WIDTH;
 432         screenAttribs[i++] = width;
 433         screenAttribs[i++] = EGL_HEIGHT;
 434         screenAttribs[i++] = height;
 435         screenAttribs[i++] = EGL_NONE;
 436
 437         screen_surf = eglCreateScreenSurfaceMESA(d, configs[0], screenAttribs);
 438         if (screen_surf == EGL_NO_SURFACE) {
 439                 printf("eglgears: failed to create screen surface\n");
 440                 return 0;
 441         }
 442
 443         b = eglShowScreenSurfaceMESA(d, screen, screen_surf, mode[chosenMode]);
 444         if (!b) {
 445                 printf("eglgears: show surface failed\n");
 446                 return 0;
 447         }
 448
 449         b = eglMakeCurrent(d, screen_surf, screen_surf, ctx);
 450         if (!b) {
 451                 printf("eglgears: make current failed\n");
 452                 return 0;
 453         }
 454
 455         if (printInfo)
 456         {
 457                 printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 458                 printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 459                 printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 460                 printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
 461         }
 462
 463         init();
 464         reshape(width, height);
 465
 466         glDrawBuffer( GL_BACK );
 467
 468         run_gears(d, screen_surf, 5.0);
 469
 470         eglDestroySurface(d, screen_surf);
 471         eglDestroyContext(d, ctx);
 472         eglTerminate(d);
 473
 474         return 0;
 475 }