progs/egl/opengles1/pbuffer.c

   1 /*
   2  * Copyright (C) 2008  Tunsgten Graphics,Inc.   All Rights Reserved.
   3  */
   4
   5 /*
   6  * Test EGL Pbuffers
   7  * Brian Paul
   8  * August 2008
   9  */
  10
  11
  12 #include <assert.h>
  13 #include <math.h>
  14 #include <stdlib.h>
  15 #include <stdio.h>
  16 #include <string.h>
  17 #include <X11/Xlib.h>
  18 #include <X11/Xutil.h>
  19 #include <X11/keysym.h>
  20 #include <GLES/gl.h>
  21 #include <GLES/glext.h>
  22 #include <EGL/egl.h>
  23
  24
  25
  26 static int WinWidth = 300, WinHeight = 300;
  27
  28 static GLfloat view_rotx = 0.0, view_roty = 0.0, view_rotz = 0.0;
  29
  30
  31 static void
  32 Normal(GLfloat *n, GLfloat nx, GLfloat ny, GLfloat nz)
  33 {
  34    n[0] = nx;
  35    n[1] = ny;
  36    n[2] = nz;
  37 }
  38
  39 static void
  40 Vertex(GLfloat *v, GLfloat vx, GLfloat vy, GLfloat vz)
  41 {
  42    v[0] = vx;
  43    v[1] = vy;
  44    v[2] = vz;
  45 }
  46
  47 static void
  48 Texcoord(GLfloat *v, GLfloat s, GLfloat t)
  49 {
  50    v[0] = s;
  51    v[1] = t;
  52 }
  53
  54
  55 /* Borrowed from glut, adapted */
  56 static void
  57 draw_torus(GLfloat r, GLfloat R, GLint nsides, GLint rings)
  58 {
  59    int i, j;
  60    GLfloat theta, phi, theta1;
  61    GLfloat cosTheta, sinTheta;
  62    GLfloat cosTheta1, sinTheta1;
  63    GLfloat ringDelta, sideDelta;
  64    GLfloat varray[100][3], narray[100][3], tarray[100][2];
  65    int vcount;
  66
  67    glVertexPointer(3, GL_FLOAT, 0, varray);
  68    glNormalPointer(GL_FLOAT, 0, narray);
  69    glTexCoordPointer(2, GL_FLOAT, 0, tarray);
  70    glEnableClientState(GL_VERTEX_ARRAY);
  71    glEnableClientState(GL_NORMAL_ARRAY);
  72    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
  73
  74    ringDelta = 2.0 * M_PI / rings;
  75    sideDelta = 2.0 * M_PI / nsides;
  76
  77    theta = 0.0;
  78    cosTheta = 1.0;
  79    sinTheta = 0.0;
  80    for (i = rings - 1; i >= 0; i--) {
  81       theta1 = theta + ringDelta;
  82       cosTheta1 = cos(theta1);
  83       sinTheta1 = sin(theta1);
  84
  85       vcount = 0; /* glBegin(GL_QUAD_STRIP); */
  86
  87       phi = 0.0;
  88       for (j = nsides; j >= 0; j--) {
  89          GLfloat s0, s1, t;
  90          GLfloat cosPhi, sinPhi, dist;
  91
  92          phi += sideDelta;
  93          cosPhi = cos(phi);
  94          sinPhi = sin(phi);
  95          dist = R + r * cosPhi;
  96
  97          s0 = 20.0 * theta / (2.0 * M_PI);
  98          s1 = 20.0 * theta1 / (2.0 * M_PI);
  99          t = 8.0 * phi / (2.0 * M_PI);
 100
 101          Normal(narray[vcount], cosTheta1 * cosPhi, -sinTheta1 * cosPhi, sinPhi);
 102          Texcoord(tarray[vcount], s1, t);
 103          Vertex(varray[vcount], cosTheta1 * dist, -sinTheta1 * dist, r * sinPhi);
 104          vcount++;
 105
 106          Normal(narray[vcount], cosTheta * cosPhi, -sinTheta * cosPhi, sinPhi);
 107          Texcoord(tarray[vcount], s0, t);
 108          Vertex(varray[vcount], cosTheta * dist, -sinTheta * dist,  r * sinPhi);
 109          vcount++;
 110       }
 111
 112       /*glEnd();*/
 113       assert(vcount <= 100);
 114       glDrawArrays(GL_TRIANGLE_STRIP, 0, vcount);
 115
 116       theta = theta1;
 117       cosTheta = cosTheta1;
 118       sinTheta = sinTheta1;
 119    }
 120
 121    glDisableClientState(GL_VERTEX_ARRAY);
 122    glDisableClientState(GL_NORMAL_ARRAY);
 123    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 124 }
 125
 126
 127 static void
 128 draw(void)
 129 {
 130    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 131
 132    glPushMatrix();
 133    glRotatef(view_rotx, 1, 0, 0);
 134    glRotatef(view_roty, 0, 1, 0);
 135    glRotatef(view_rotz, 0, 0, 1);
 136    glScalef(0.5, 0.5, 0.5);
 137
 138    draw_torus(1.0, 3.0, 30, 60);
 139
 140    glPopMatrix();
 141
 142    glFinish();
 143 }
 144
 145
 146 /**
 147  * Draw to both the window and pbuffer and compare results.
 148  */
 149 static void
 150 draw_both(EGLDisplay egl_dpy, EGLSurface egl_surf, EGLSurface egl_pbuf,
 151           EGLContext egl_ctx)
 152 {
 153    unsigned *wbuf, *pbuf;
 154    int x = 100, y = 110;
 155    int i, dif;
 156
 157    wbuf = (unsigned *) malloc(WinWidth * WinHeight * 4);
 158    pbuf = (unsigned *) malloc(WinWidth * WinHeight * 4);
 159
 160    glPixelStorei(GL_PACK_ALIGNMENT, 1);
 161
 162    /* first draw to window */
 163    if (!eglMakeCurrent(egl_dpy, egl_surf, egl_surf, egl_ctx)) {
 164       printf("Error: eglMakeCurrent(window) failed\n");
 165       return;
 166    }
 167    draw();
 168    glReadPixels(0, 0, WinWidth, WinHeight, GL_RGBA, GL_UNSIGNED_BYTE, wbuf);
 169    printf("Window[%d,%d] = 0x%08x\n", x, y, wbuf[y*WinWidth+x]);
 170
 171    eglSwapBuffers(egl_dpy, egl_surf);
 172
 173    /* then draw to pbuffer */
 174    if (!eglMakeCurrent(egl_dpy, egl_pbuf, egl_pbuf, egl_ctx)) {
 175       printf("Error: eglMakeCurrent(pbuffer) failed\n");
 176       return;
 177    }
 178    draw();
 179    glReadPixels(0, 0, WinWidth, WinHeight, GL_RGBA, GL_UNSIGNED_BYTE, pbuf);
 180    printf("Pbuffer[%d,%d] = 0x%08x\n", x, y, pbuf[y*WinWidth+x]);
 181
 182
 183    /* compare renderings */
 184    for (dif = i = 0; i < WinWidth * WinHeight; i++) {
 185       if (wbuf[i] != pbuf[i]) {
 186          dif = 1;
 187          break;
 188       }
 189    }
 190
 191    if (dif)
 192       printf("Difference at %d: 0x%08x vs. 0x%08x\n", i, wbuf[i], pbuf[i]);
 193    else
 194       printf("Window rendering matches Pbuffer rendering!\n");
 195
 196    free(wbuf);
 197    free(pbuf);
 198 }
 199
 200
 201 /* new window size or exposure */
 202 static void
 203 reshape(int width, int height)
 204 {
 205    GLfloat ar = (GLfloat) width / (GLfloat) height;
 206
 207    WinWidth = width;
 208    WinHeight = height;
 209
 210    glViewport(0, 0, (GLint) width, (GLint) height);
 211
 212    glMatrixMode(GL_PROJECTION);
 213    glLoadIdentity();
 214
 215 #ifdef GL_VERSION_ES_CM_1_0
 216    glFrustumf(-ar, ar, -1, 1, 5.0, 60.0);
 217 #else
 218    glFrustum(-ar, ar, -1, 1, 5.0, 60.0);
 219 #endif
 220
 221    glMatrixMode(GL_MODELVIEW);
 222    glLoadIdentity();
 223    glTranslatef(0.0, 0.0, -15.0);
 224 }
 225
 226
 227 static void
 228 make_texture(void)
 229 {
 230 #define SZ 64
 231    GLenum Filter = GL_LINEAR;
 232    GLubyte image[SZ][SZ][4];
 233    GLuint i, j;
 234
 235    for (i = 0; i < SZ; i++) {
 236       for (j = 0; j < SZ; j++) {
 237          GLfloat d = (i - SZ/2) * (i - SZ/2) + (j - SZ/2) * (j - SZ/2);
 238          d = sqrt(d);
 239          if (d < SZ/3) {
 240             image[i][j][0] = 255;
 241             image[i][j][1] = 255;
 242             image[i][j][2] = 255;
 243             image[i][j][3] = 255;
 244          }
 245          else {
 246             image[i][j][0] = 127;
 247             image[i][j][1] = 127;
 248             image[i][j][2] = 127;
 249             image[i][j][3] = 255;
 250          }
 251       }
 252    }
 253
 254    glActiveTexture(GL_TEXTURE0); /* unit 0 */
 255    glBindTexture(GL_TEXTURE_2D, 42);
 256    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SZ, SZ, 0,
 257                 GL_RGBA, GL_UNSIGNED_BYTE, image);
 258    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, Filter);
 259    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, Filter);
 260    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 261    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 262 #undef SZ
 263 }
 264
 265
 266
 267 static void
 268 init(void)
 269 {
 270    static const GLfloat red[4] = {1, 0, 0, 0};
 271    static const GLfloat white[4] = {1.0, 1.0, 1.0, 1.0};
 272    static const GLfloat diffuse[4] = {0.7, 0.7, 0.7, 1.0};
 273    static const GLfloat specular[4] = {0.001, 0.001, 0.001, 1.0};
 274    static const GLfloat pos[4] = {20, 20, 50, 1};
 275
 276    glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red);
 277    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, white);
 278    glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 9.0);
 279
 280    glEnable(GL_LIGHTING);
 281    glEnable(GL_LIGHT0);
 282    glLightfv(GL_LIGHT0, GL_POSITION, pos);
 283    glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
 284    glLightfv(GL_LIGHT0, GL_SPECULAR, specular);
 285
 286    glClearColor(0.4, 0.4, 0.4, 0.0);
 287    glEnable(GL_DEPTH_TEST);
 288
 289    make_texture();
 290    glEnable(GL_TEXTURE_2D);
 291 }
 292
 293
 294 /*
 295  * Create an RGB, double-buffered X window.
 296  * Return the window and context handles.
 297  */
 298 static void
 299 make_x_window(Display *x_dpy, EGLDisplay egl_dpy,
 300               const char *name,
 301               int x, int y, int width, int height,
 302               Window *winRet,
 303               EGLContext *ctxRet,
 304               EGLSurface *surfRet)
 305 {
 306    static const EGLint attribs[] = {
 307       EGL_RED_SIZE, 1,
 308       EGL_GREEN_SIZE, 1,
 309       EGL_BLUE_SIZE, 1,
 310       EGL_DEPTH_SIZE, 1,
 311       EGL_NONE
 312    };
 313
 314    int scrnum;
 315    XSetWindowAttributes attr;
 316    unsigned long mask;
 317    Window root;
 318    Window win;
 319    XVisualInfo *visInfo, visTemplate;
 320    int num_visuals;
 321    EGLContext ctx;
 322    EGLConfig config;
 323    EGLint num_configs;
 324    EGLint vid;
 325
 326    scrnum = DefaultScreen( x_dpy );
 327    root = RootWindow( x_dpy, scrnum );
 328
 329    if (!eglChooseConfig( egl_dpy, attribs, &config, 1, &num_configs)) {
 330       printf("Error: couldn't get an EGL visual config\n");
 331       exit(1);
 332    }
 333
 334    assert(config);
 335    assert(num_configs > 0);
 336
 337    if (!eglGetConfigAttrib(egl_dpy, config, EGL_NATIVE_VISUAL_ID, &vid)) {
 338       printf("Error: eglGetConfigAttrib() failed\n");
 339       exit(1);
 340    }
 341
 342    /* The X window visual must match the EGL config */
 343    visTemplate.visualid = vid;
 344    visInfo = XGetVisualInfo(x_dpy, VisualIDMask, &visTemplate, &num_visuals);
 345    if (!visInfo) {
 346       printf("Error: couldn't get X visual\n");
 347       exit(1);
 348    }
 349
 350    /* window attributes */
 351    attr.background_pixel = 0;
 352    attr.border_pixel = 0;
 353    attr.colormap = XCreateColormap( x_dpy, root, visInfo->visual, AllocNone);
 354    attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
 355    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
 356
 357    win = XCreateWindow( x_dpy, root, 0, 0, width, height,
 358                         0, visInfo->depth, InputOutput,
 359                         visInfo->visual, mask, &attr );
 360
 361    /* set hints and properties */
 362    {
 363       XSizeHints sizehints;
 364       sizehints.x = x;
 365       sizehints.y = y;
 366       sizehints.width  = width;
 367       sizehints.height = height;
 368       sizehints.flags = USSize | USPosition;
 369       XSetNormalHints(x_dpy, win, &sizehints);
 370       XSetStandardProperties(x_dpy, win, name, name,
 371                               None, (char **)NULL, 0, &sizehints);
 372    }
 373
 374    eglBindAPI(EGL_OPENGL_ES_API);
 375
 376    ctx = eglCreateContext(egl_dpy, config, EGL_NO_CONTEXT, NULL );
 377    if (!ctx) {
 378       printf("Error: eglCreateContext failed\n");
 379       exit(1);
 380    }
 381
 382    *surfRet = eglCreateWindowSurface(egl_dpy, config, win, NULL);
 383
 384    if (!*surfRet) {
 385       printf("Error: eglCreateWindowSurface failed\n");
 386       exit(1);
 387    }
 388
 389    XFree(visInfo);
 390
 391    *winRet = win;
 392    *ctxRet = ctx;
 393 }
 394
 395
 396 static EGLSurface
 397 make_pbuffer(Display *x_dpy, EGLDisplay egl_dpy, int width, int height)
 398 {
 399    static const EGLint config_attribs[] = {
 400       EGL_RED_SIZE, 1,
 401       EGL_GREEN_SIZE, 1,
 402       EGL_BLUE_SIZE, 1,
 403       EGL_DEPTH_SIZE, 1,
 404       EGL_NONE
 405    };
 406    EGLConfig config;
 407    EGLSurface pbuf;
 408    EGLint num_configs;
 409    EGLint pbuf_attribs[5];
 410
 411    pbuf_attribs[0] = EGL_WIDTH;
 412    pbuf_attribs[1] = width;
 413    pbuf_attribs[2] = EGL_HEIGHT;
 414    pbuf_attribs[3] = height;
 415    pbuf_attribs[4] = EGL_NONE;
 416
 417    if (!eglChooseConfig( egl_dpy, config_attribs, &config, 1, &num_configs)) {
 418       printf("Error: couldn't get an EGL config for pbuffer\n");
 419       exit(1);
 420    }
 421
 422    pbuf = eglCreatePbufferSurface(egl_dpy, config, pbuf_attribs);
 423
 424    return pbuf;
 425 }
 426
 427
 428 static void
 429 event_loop(Display *dpy, Window win,
 430            EGLDisplay egl_dpy, EGLSurface egl_surf, EGLSurface egl_pbuf,
 431            EGLContext egl_ctx)
 432 {
 433    int anim = 0;
 434
 435    while (1) {
 436       int redraw = 0;
 437
 438       if (!anim || XPending(dpy)) {
 439          XEvent event;
 440          XNextEvent(dpy, &event);
 441
 442          switch (event.type) {
 443          case Expose:
 444             redraw = 1;
 445             break;
 446          case ConfigureNotify:
 447             if (event.xconfigure.window == win)
 448                reshape(event.xconfigure.width, event.xconfigure.height);
 449             break;
 450          case KeyPress:
 451             {
 452                char buffer[10];
 453                int r, code;
 454                code = XLookupKeysym(&event.xkey, 0);
 455                if (code == XK_Left) {
 456                view_roty += 5.0;
 457                }
 458                else if (code == XK_Right) {
 459                   view_roty -= 5.0;
 460                }
 461                else if (code == XK_Up) {
 462                   view_rotx += 5.0;
 463                }
 464                else if (code == XK_Down) {
 465                   view_rotx -= 5.0;
 466                }
 467                else {
 468                   r = XLookupString(&event.xkey, buffer, sizeof(buffer),
 469                                     NULL, NULL);
 470                   if (buffer[0] == ' ') {
 471                      anim = !anim;
 472                   }
 473                   else if (buffer[0] == 27) {
 474                      /* escape */
 475                      return;
 476                   }
 477                }
 478             }
 479             redraw = 1;
 480             break;
 481          default:
 482             ; /*no-op*/
 483          }
 484       }
 485
 486       if (anim) {
 487          view_rotx += 1.0;
 488          view_roty += 2.0;
 489          redraw = 1;
 490       }
 491
 492       if (redraw) {
 493          draw_both(egl_dpy, egl_surf, egl_pbuf, egl_ctx);
 494       }
 495    }
 496 }
 497
 498
 499 static void
 500 usage(void)
 501 {
 502    printf("Usage:\n");
 503    printf("  -display <displayname>  set the display to run on\n");
 504    printf("  -info                   display OpenGL renderer info\n");
 505 }
 506
 507
 508 int
 509 main(int argc, char *argv[])
 510 {
 511    Display *x_dpy;
 512    Window win;
 513    EGLSurface egl_surf, egl_pbuf;
 514    EGLContext egl_ctx;
 515    EGLDisplay egl_dpy;
 516    char *dpyName = NULL;
 517    GLboolean printInfo = GL_FALSE;
 518    EGLint egl_major, egl_minor;
 519    int i;
 520    const char *s;
 521
 522    for (i = 1; i < argc; i++) {
 523       if (strcmp(argv[i], "-display") == 0) {
 524          dpyName = argv[i+1];
 525          i++;
 526       }
 527       else if (strcmp(argv[i], "-info") == 0) {
 528          printInfo = GL_TRUE;
 529       }
 530       else {
 531          usage();
 532          return -1;
 533       }
 534    }
 535
 536    x_dpy = XOpenDisplay(dpyName);
 537    if (!x_dpy) {
 538       printf("Error: couldn't open display %s\n",
 539              dpyName ? dpyName : getenv("DISPLAY"));
 540       return -1;
 541    }
 542
 543    egl_dpy = eglGetDisplay(x_dpy);
 544    if (!egl_dpy) {
 545       printf("Error: eglGetDisplay() failed\n");
 546       return -1;
 547    }
 548
 549    if (!eglInitialize(egl_dpy, &egl_major, &egl_minor)) {
 550       printf("Error: eglInitialize() failed\n");
 551       return -1;
 552    }
 553
 554    s = eglQueryString(egl_dpy, EGL_VERSION);
 555    printf("EGL_VERSION = %s\n", s);
 556
 557    s = eglQueryString(egl_dpy, EGL_VENDOR);
 558    printf("EGL_VENDOR = %s\n", s);
 559
 560    s = eglQueryString(egl_dpy, EGL_EXTENSIONS);
 561    printf("EGL_EXTENSIONS = %s\n", s);
 562
 563    s = eglQueryString(egl_dpy, EGL_CLIENT_APIS);
 564    printf("EGL_CLIENT_APIS = %s\n", s);
 565
 566    make_x_window(x_dpy, egl_dpy,
 567                  "pbuffer", 0, 0, WinWidth, WinHeight,
 568                  &win, &egl_ctx, &egl_surf);
 569
 570    egl_pbuf = make_pbuffer(x_dpy, egl_dpy, WinWidth, WinHeight);
 571    if (!egl_pbuf) {
 572       printf("Error: eglCreatePBufferSurface() failed\n");
 573       return -1;
 574    }
 575
 576    XMapWindow(x_dpy, win);
 577    if (!eglMakeCurrent(egl_dpy, egl_surf, egl_surf, egl_ctx)) {
 578       printf("Error: eglMakeCurrent() failed\n");
 579       return -1;
 580    }
 581
 582    if (printInfo) {
 583       printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 584       printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 585       printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 586       printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
 587    }
 588
 589    init();
 590
 591    /* Set initial projection/viewing transformation.
 592     * We can't be sure we'll get a ConfigureNotify event when the window
 593     * first appears.
 594     */
 595    reshape(WinWidth, WinHeight);
 596
 597    event_loop(x_dpy, win, egl_dpy, egl_surf, egl_pbuf, egl_ctx);
 598
 599    eglDestroyContext(egl_dpy, egl_ctx);
 600    eglDestroySurface(egl_dpy, egl_surf);
 601    eglTerminate(egl_dpy);
 602
 603
 604    XDestroyWindow(x_dpy, win);
 605    XCloseDisplay(x_dpy);
 606
 607    return 0;
 608 }