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    /* then draw to pbuffer */
 172    if (!eglMakeCurrent(egl_dpy, egl_pbuf, egl_pbuf, egl_ctx)) {
 173       printf("Error: eglMakeCurrent(pbuffer) failed\n");
 174       return;
 175    }
 176    draw();
 177    glReadPixels(0, 0, WinWidth, WinHeight, GL_RGBA, GL_UNSIGNED_BYTE, pbuf);
 178    printf("Pbuffer[%d,%d] = 0x%08x\n", x, y, pbuf[y*WinWidth+x]);
 179
 180    eglSwapBuffers(egl_dpy, egl_surf);
 181
 182    /* compare renderings */
 183    for (dif = i = 0; i < WinWidth * WinHeight; i++) {
 184       if (wbuf[i] != pbuf[i]) {
 185          dif = 1;
 186          break;
 187       }
 188    }
 189
 190    if (dif)
 191       printf("Difference at %d: 0x%08x vs. 0x%08x\n", i, wbuf[i], pbuf[i]);
 192    else
 193       printf("Window rendering matches Pbuffer rendering!\n");
 194
 195    free(wbuf);
 196    free(pbuf);
 197 }
 198
 199
 200 /* new window size or exposure */
 201 static void
 202 reshape(int width, int height)
 203 {
 204    GLfloat ar = (GLfloat) width / (GLfloat) height;
 205
 206    WinWidth = width;
 207    WinHeight = height;
 208
 209    glViewport(0, 0, (GLint) width, (GLint) height);
 210
 211    glMatrixMode(GL_PROJECTION);
 212    glLoadIdentity();
 213
 214 #ifdef GL_VERSION_ES_CM_1_0
 215    glFrustumf(-ar, ar, -1, 1, 5.0, 60.0);
 216 #else
 217    glFrustum(-ar, ar, -1, 1, 5.0, 60.0);
 218 #endif
 219
 220    glMatrixMode(GL_MODELVIEW);
 221    glLoadIdentity();
 222    glTranslatef(0.0, 0.0, -15.0);
 223 }
 224
 225
 226 static void
 227 make_texture(void)
 228 {
 229 #define SZ 64
 230    GLenum Filter = GL_LINEAR;
 231    GLubyte image[SZ][SZ][4];
 232    GLuint i, j;
 233
 234    for (i = 0; i < SZ; i++) {
 235       for (j = 0; j < SZ; j++) {
 236          GLfloat d = (i - SZ/2) * (i - SZ/2) + (j - SZ/2) * (j - SZ/2);
 237          d = sqrt(d);
 238          if (d < SZ/3) {
 239             image[i][j][0] = 255;
 240             image[i][j][1] = 255;
 241             image[i][j][2] = 255;
 242             image[i][j][3] = 255;
 243          }
 244          else {
 245             image[i][j][0] = 127;
 246             image[i][j][1] = 127;
 247             image[i][j][2] = 127;
 248             image[i][j][3] = 255;
 249          }
 250       }
 251    }
 252
 253    glActiveTexture(GL_TEXTURE0); /* unit 0 */
 254    glBindTexture(GL_TEXTURE_2D, 42);
 255    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SZ, SZ, 0,
 256                 GL_RGBA, GL_UNSIGNED_BYTE, image);
 257    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, Filter);
 258    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, Filter);
 259    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 260    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 261 #undef SZ
 262 }
 263
 264
 265
 266 static void
 267 init(void)
 268 {
 269    static const GLfloat red[4] = {1, 0, 0, 0};
 270    static const GLfloat white[4] = {1.0, 1.0, 1.0, 1.0};
 271    static const GLfloat diffuse[4] = {0.7, 0.7, 0.7, 1.0};
 272    static const GLfloat specular[4] = {0.001, 0.001, 0.001, 1.0};
 273    static const GLfloat pos[4] = {20, 20, 50, 1};
 274
 275    glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red);
 276    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, white);
 277    glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 9.0);
 278
 279    glEnable(GL_LIGHTING);
 280    glEnable(GL_LIGHT0);
 281    glLightfv(GL_LIGHT0, GL_POSITION, pos);
 282    glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
 283    glLightfv(GL_LIGHT0, GL_SPECULAR, specular);
 284
 285    glClearColor(0.4, 0.4, 0.4, 0.0);
 286    glEnable(GL_DEPTH_TEST);
 287
 288    make_texture();
 289    glEnable(GL_TEXTURE_2D);
 290 }
 291
 292
 293 /*
 294  * Create an RGB, double-buffered X window.
 295  * Return the window and context handles.
 296  */
 297 static void
 298 make_x_window(Display *x_dpy, EGLDisplay egl_dpy,
 299               const char *name,
 300               int x, int y, int width, int height,
 301               Window *winRet,
 302               EGLContext *ctxRet,
 303               EGLSurface *surfRet)
 304 {
 305    static const EGLint attribs[] = {
 306       EGL_RED_SIZE, 1,
 307       EGL_GREEN_SIZE, 1,
 308       EGL_BLUE_SIZE, 1,
 309       EGL_DEPTH_SIZE, 1,
 310       EGL_NONE
 311    };
 312
 313    int scrnum;
 314    XSetWindowAttributes attr;
 315    unsigned long mask;
 316    Window root;
 317    Window win;
 318    XVisualInfo *visInfo, visTemplate;
 319    int num_visuals;
 320    EGLContext ctx;
 321    EGLConfig config;
 322    EGLint num_configs;
 323    EGLint vid;
 324
 325    scrnum = DefaultScreen( x_dpy );
 326    root = RootWindow( x_dpy, scrnum );
 327
 328    if (!eglChooseConfig( egl_dpy, attribs, &config, 1, &num_configs)) {
 329       printf("Error: couldn't get an EGL visual config\n");
 330       exit(1);
 331    }
 332
 333    assert(config);
 334    assert(num_configs > 0);
 335
 336    if (!eglGetConfigAttrib(egl_dpy, config, EGL_NATIVE_VISUAL_ID, &vid)) {
 337       printf("Error: eglGetConfigAttrib() failed\n");
 338       exit(1);
 339    }
 340
 341    /* The X window visual must match the EGL config */
 342    visTemplate.visualid = vid;
 343    visInfo = XGetVisualInfo(x_dpy, VisualIDMask, &visTemplate, &num_visuals);
 344    if (!visInfo) {
 345       printf("Error: couldn't get X visual\n");
 346       exit(1);
 347    }
 348
 349    /* window attributes */
 350    attr.background_pixel = 0;
 351    attr.border_pixel = 0;
 352    attr.colormap = XCreateColormap( x_dpy, root, visInfo->visual, AllocNone);
 353    attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
 354    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
 355
 356    win = XCreateWindow( x_dpy, root, 0, 0, width, height,
 357                         0, visInfo->depth, InputOutput,
 358                         visInfo->visual, mask, &attr );
 359
 360    /* set hints and properties */
 361    {
 362       XSizeHints sizehints;
 363       sizehints.x = x;
 364       sizehints.y = y;
 365       sizehints.width  = width;
 366       sizehints.height = height;
 367       sizehints.flags = USSize | USPosition;
 368       XSetNormalHints(x_dpy, win, &sizehints);
 369       XSetStandardProperties(x_dpy, win, name, name,
 370                               None, (char **)NULL, 0, &sizehints);
 371    }
 372
 373    eglBindAPI(EGL_OPENGL_ES_API);
 374
 375    ctx = eglCreateContext(egl_dpy, config, EGL_NO_CONTEXT, NULL );
 376    if (!ctx) {
 377       printf("Error: eglCreateContext failed\n");
 378       exit(1);
 379    }
 380
 381    *surfRet = eglCreateWindowSurface(egl_dpy, config, win, NULL);
 382
 383    if (!*surfRet) {
 384       printf("Error: eglCreateWindowSurface failed\n");
 385       exit(1);
 386    }
 387
 388    XFree(visInfo);
 389
 390    *winRet = win;
 391    *ctxRet = ctx;
 392 }
 393
 394
 395 static EGLSurface
 396 make_pbuffer(Display *x_dpy, EGLDisplay egl_dpy, int width, int height)
 397 {
 398    static const EGLint config_attribs[] = {
 399       EGL_RED_SIZE, 1,
 400       EGL_GREEN_SIZE, 1,
 401       EGL_BLUE_SIZE, 1,
 402       EGL_DEPTH_SIZE, 1,
 403       EGL_NONE
 404    };
 405    EGLConfig config;
 406    EGLSurface pbuf;
 407    EGLint num_configs;
 408    EGLint pbuf_attribs[5];
 409
 410    pbuf_attribs[0] = EGL_WIDTH;
 411    pbuf_attribs[1] = width;
 412    pbuf_attribs[2] = EGL_HEIGHT;
 413    pbuf_attribs[3] = height;
 414    pbuf_attribs[4] = EGL_NONE;
 415
 416    if (!eglChooseConfig( egl_dpy, config_attribs, &config, 1, &num_configs)) {
 417       printf("Error: couldn't get an EGL config for pbuffer\n");
 418       exit(1);
 419    }
 420
 421    pbuf = eglCreatePbufferSurface(egl_dpy, config, pbuf_attribs);
 422
 423    return pbuf;
 424 }
 425
 426
 427 static void
 428 event_loop(Display *dpy, Window win,
 429            EGLDisplay egl_dpy, EGLSurface egl_surf, EGLSurface egl_pbuf,
 430            EGLContext egl_ctx)
 431 {
 432    int anim = 0;
 433
 434    while (1) {
 435       int redraw = 0;
 436
 437       if (!anim || XPending(dpy)) {
 438          XEvent event;
 439          XNextEvent(dpy, &event);
 440
 441          switch (event.type) {
 442          case Expose:
 443             redraw = 1;
 444             break;
 445          case ConfigureNotify:
 446             if (event.xconfigure.window == win)
 447                reshape(event.xconfigure.width, event.xconfigure.height);
 448             break;
 449          case KeyPress:
 450             {
 451                char buffer[10];
 452                int r, code;
 453                code = XLookupKeysym(&event.xkey, 0);
 454                if (code == XK_Left) {
 455                view_roty += 5.0;
 456                }
 457                else if (code == XK_Right) {
 458                   view_roty -= 5.0;
 459                }
 460                else if (code == XK_Up) {
 461                   view_rotx += 5.0;
 462                }
 463                else if (code == XK_Down) {
 464                   view_rotx -= 5.0;
 465                }
 466                else {
 467                   r = XLookupString(&event.xkey, buffer, sizeof(buffer),
 468                                     NULL, NULL);
 469                   if (buffer[0] == ' ') {
 470                      anim = !anim;
 471                   }
 472                   else if (buffer[0] == 27) {
 473                      /* escape */
 474                      return;
 475                   }
 476                }
 477             }
 478             redraw = 1;
 479             break;
 480          default:
 481             ; /*no-op*/
 482          }
 483       }
 484
 485       if (anim) {
 486          view_rotx += 1.0;
 487          view_roty += 2.0;
 488          redraw = 1;
 489       }
 490
 491       if (redraw) {
 492          draw_both(egl_dpy, egl_surf, egl_pbuf, egl_ctx);
 493       }
 494    }
 495 }
 496
 497
 498 static void
 499 usage(void)
 500 {
 501    printf("Usage:\n");
 502    printf("  -display <displayname>  set the display to run on\n");
 503    printf("  -info                   display OpenGL renderer info\n");
 504 }
 505
 506
 507 int
 508 main(int argc, char *argv[])
 509 {
 510    Display *x_dpy;
 511    Window win;
 512    EGLSurface egl_surf, egl_pbuf;
 513    EGLContext egl_ctx;
 514    EGLDisplay egl_dpy;
 515    char *dpyName = NULL;
 516    GLboolean printInfo = GL_FALSE;
 517    EGLint egl_major, egl_minor;
 518    int i;
 519    const char *s;
 520
 521    for (i = 1; i < argc; i++) {
 522       if (strcmp(argv[i], "-display") == 0) {
 523          dpyName = argv[i+1];
 524          i++;
 525       }
 526       else if (strcmp(argv[i], "-info") == 0) {
 527          printInfo = GL_TRUE;
 528       }
 529       else {
 530          usage();
 531          return -1;
 532       }
 533    }
 534
 535    x_dpy = XOpenDisplay(dpyName);
 536    if (!x_dpy) {
 537       printf("Error: couldn't open display %s\n",
 538              dpyName ? dpyName : getenv("DISPLAY"));
 539       return -1;
 540    }
 541
 542    egl_dpy = eglGetDisplay(x_dpy);
 543    if (!egl_dpy) {
 544       printf("Error: eglGetDisplay() failed\n");
 545       return -1;
 546    }
 547
 548    if (!eglInitialize(egl_dpy, &egl_major, &egl_minor)) {
 549       printf("Error: eglInitialize() failed\n");
 550       return -1;
 551    }
 552
 553    s = eglQueryString(egl_dpy, EGL_VERSION);
 554    printf("EGL_VERSION = %s\n", s);
 555
 556    s = eglQueryString(egl_dpy, EGL_VENDOR);
 557    printf("EGL_VENDOR = %s\n", s);
 558
 559    s = eglQueryString(egl_dpy, EGL_EXTENSIONS);
 560    printf("EGL_EXTENSIONS = %s\n", s);
 561
 562    s = eglQueryString(egl_dpy, EGL_CLIENT_APIS);
 563    printf("EGL_CLIENT_APIS = %s\n", s);
 564
 565    make_x_window(x_dpy, egl_dpy,
 566                  "pbuffer", 0, 0, WinWidth, WinHeight,
 567                  &win, &egl_ctx, &egl_surf);
 568
 569    egl_pbuf = make_pbuffer(x_dpy, egl_dpy, WinWidth, WinHeight);
 570    if (!egl_pbuf) {
 571       printf("Error: eglCreatePBufferSurface() failed\n");
 572       return -1;
 573    }
 574
 575    XMapWindow(x_dpy, win);
 576    if (!eglMakeCurrent(egl_dpy, egl_surf, egl_surf, egl_ctx)) {
 577       printf("Error: eglMakeCurrent() failed\n");
 578       return -1;
 579    }
 580
 581    if (printInfo) {
 582       printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 583       printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 584       printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 585       printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
 586    }
 587
 588    init();
 589
 590    /* Set initial projection/viewing transformation.
 591     * We can't be sure we'll get a ConfigureNotify event when the window
 592     * first appears.
 593     */
 594    reshape(WinWidth, WinHeight);
 595
 596    event_loop(x_dpy, win, egl_dpy, egl_surf, egl_pbuf, egl_ctx);
 597
 598    eglDestroyContext(egl_dpy, egl_ctx);
 599    eglDestroySurface(egl_dpy, egl_surf);
 600    eglTerminate(egl_dpy);
 601
 602
 603    XDestroyWindow(x_dpy, win);
 604    XCloseDisplay(x_dpy);
 605
 606    return 0;
 607 }