progs/es1/xegl/drawtex.c

   1 /*
   2  * Copyright (C) 2008  Tunsgten Graphics,Inc.   All Rights Reserved.
   3  */
   4
   5 /*
   6  * Test GL_OES_draw_texture
   7  * Brian Paul
   8  * August 2008
   9  */
  10
  11 #define GL_GLEXT_PROTOTYPES
  12
  13 #include <assert.h>
  14 #include <math.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18 #include <X11/Xlib.h>
  19 #include <X11/Xutil.h>
  20 #include <X11/keysym.h>
  21 #include <GLES/gl.h>
  22 #include <GLES/glext.h>
  23 #include <EGL/egl.h>
  24
  25
  26
  27 static GLfloat view_posx = 10.0, view_posy = 20.0;
  28 static GLfloat width = 200, height = 200;
  29
  30
  31 static void
  32 draw(void)
  33 {
  34    glClear(GL_COLOR_BUFFER_BIT);
  35
  36    glDrawTexfOES(view_posx, view_posy, 0.0, width, height);
  37 }
  38
  39
  40 /* new window size or exposure */
  41 static void
  42 reshape(int width, int height)
  43 {
  44    GLfloat ar = (GLfloat) width / (GLfloat) height;
  45
  46    glViewport(0, 0, (GLint) width, (GLint) height);
  47
  48    glMatrixMode(GL_PROJECTION);
  49    glLoadIdentity();
  50
  51 #ifdef GL_VERSION_ES_CM_1_0
  52    glFrustumf(-ar, ar, -1, 1, 5.0, 60.0);
  53 #else
  54    glFrustum(-ar, ar, -1, 1, 5.0, 60.0);
  55 #endif
  56
  57    glMatrixMode(GL_MODELVIEW);
  58    glLoadIdentity();
  59    glTranslatef(0.0, 0.0, -15.0);
  60 }
  61
  62
  63 static float
  64 dist(GLuint i, GLuint j, float x, float y)
  65 {
  66    return sqrt((i-x) * (i-x) + (j-y) * (j-y));
  67 }
  68
  69 static void
  70 make_smile_texture(void)
  71 {
  72 #define SZ 128
  73    GLenum Filter = GL_LINEAR;
  74    GLubyte image[SZ][SZ][4];
  75    GLuint i, j;
  76    GLint cropRect[4];
  77
  78    for (i = 0; i < SZ; i++) {
  79       for (j = 0; j < SZ; j++) {
  80          GLfloat d_mouth = dist(i, j, SZ/2, SZ/2);
  81          GLfloat d_rt_eye = dist(i, j, SZ*3/4, SZ*3/4);
  82          GLfloat d_lt_eye = dist(i, j, SZ*3/4, SZ*1/4);
  83          if (d_rt_eye < SZ / 8 || d_lt_eye < SZ / 8) {
  84             image[i][j][0] = 20;
  85             image[i][j][1] = 50;
  86             image[i][j][2] = 255;
  87             image[i][j][3] = 255;
  88          }
  89          else if (i < SZ/2 && d_mouth < SZ/3) {
  90             image[i][j][0] = 255;
  91             image[i][j][1] = 20;
  92             image[i][j][2] = 20;
  93             image[i][j][3] = 255;
  94          }
  95          else {
  96             image[i][j][0] = 200;
  97             image[i][j][1] = 200;
  98             image[i][j][2] = 200;
  99             image[i][j][3] = 255;
 100          }
 101       }
 102    }
 103
 104    glActiveTexture(GL_TEXTURE0); /* unit 0 */
 105    glBindTexture(GL_TEXTURE_2D, 42);
 106    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SZ, SZ, 0,
 107                 GL_RGBA, GL_UNSIGNED_BYTE, image);
 108    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, Filter);
 109    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, Filter);
 110    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 111    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 112
 113    cropRect[0] = 0;
 114    cropRect[1] = 0;
 115    cropRect[2] = SZ;
 116    cropRect[3] = SZ;
 117    glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES, cropRect);
 118 #undef SZ
 119 }
 120
 121
 122
 123 static void
 124 init(void)
 125 {
 126    const char *ext = (char *) glGetString(GL_EXTENSIONS);
 127
 128    if (!strstr(ext, "GL_OES_draw_texture")) {
 129       fprintf(stderr, "Sorry, this program requires GL_OES_draw_texture");
 130       exit(1);
 131    }
 132
 133    glClearColor(0.4, 0.4, 0.4, 0.0);
 134
 135    make_smile_texture();
 136    glEnable(GL_TEXTURE_2D);
 137 }
 138
 139
 140 /*
 141  * Create an RGB, double-buffered X window.
 142  * Return the window and context handles.
 143  */
 144 static void
 145 make_x_window(Display *x_dpy, EGLDisplay egl_dpy,
 146               const char *name,
 147               int x, int y, int width, int height,
 148               Window *winRet,
 149               EGLContext *ctxRet,
 150               EGLSurface *surfRet)
 151 {
 152    static const EGLint attribs[] = {
 153       EGL_RED_SIZE, 1,
 154       EGL_GREEN_SIZE, 1,
 155       EGL_BLUE_SIZE, 1,
 156       EGL_NONE
 157    };
 158
 159    int scrnum;
 160    XSetWindowAttributes attr;
 161    unsigned long mask;
 162    Window root;
 163    Window win;
 164    XVisualInfo *visInfo, visTemplate;
 165    int num_visuals;
 166    EGLContext ctx;
 167    EGLConfig config;
 168    EGLint num_configs;
 169    EGLint vid;
 170
 171    scrnum = DefaultScreen( x_dpy );
 172    root = RootWindow( x_dpy, scrnum );
 173
 174    if (!eglChooseConfig( egl_dpy, attribs, &config, 1, &num_configs)) {
 175       printf("Error: couldn't get an EGL visual config\n");
 176       exit(1);
 177    }
 178
 179    assert(config);
 180    assert(num_configs > 0);
 181
 182    if (!eglGetConfigAttrib(egl_dpy, config, EGL_NATIVE_VISUAL_ID, &vid)) {
 183       printf("Error: eglGetConfigAttrib() failed\n");
 184       exit(1);
 185    }
 186
 187    /* The X window visual must match the EGL config */
 188    visTemplate.visualid = vid;
 189    visInfo = XGetVisualInfo(x_dpy, VisualIDMask, &visTemplate, &num_visuals);
 190    if (!visInfo) {
 191       printf("Error: couldn't get X visual\n");
 192       exit(1);
 193    }
 194
 195    /* window attributes */
 196    attr.background_pixel = 0;
 197    attr.border_pixel = 0;
 198    attr.colormap = XCreateColormap( x_dpy, root, visInfo->visual, AllocNone);
 199    attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
 200    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
 201
 202    win = XCreateWindow( x_dpy, root, 0, 0, width, height,
 203                         0, visInfo->depth, InputOutput,
 204                         visInfo->visual, mask, &attr );
 205
 206    /* set hints and properties */
 207    {
 208       XSizeHints sizehints;
 209       sizehints.x = x;
 210       sizehints.y = y;
 211       sizehints.width  = width;
 212       sizehints.height = height;
 213       sizehints.flags = USSize | USPosition;
 214       XSetNormalHints(x_dpy, win, &sizehints);
 215       XSetStandardProperties(x_dpy, win, name, name,
 216                               None, (char **)NULL, 0, &sizehints);
 217    }
 218
 219    eglBindAPI(EGL_OPENGL_ES_API);
 220
 221    ctx = eglCreateContext(egl_dpy, config, EGL_NO_CONTEXT, NULL );
 222    if (!ctx) {
 223       printf("Error: eglCreateContext failed\n");
 224       exit(1);
 225    }
 226
 227    *surfRet = eglCreateWindowSurface(egl_dpy, config, win, NULL);
 228
 229    if (!*surfRet) {
 230       printf("Error: eglCreateWindowSurface failed\n");
 231       exit(1);
 232    }
 233
 234    XFree(visInfo);
 235
 236    *winRet = win;
 237    *ctxRet = ctx;
 238 }
 239
 240
 241 static void
 242 event_loop(Display *dpy, Window win,
 243            EGLDisplay egl_dpy, EGLSurface egl_surf)
 244 {
 245    int anim = 0;
 246
 247    while (1) {
 248       int redraw = 0;
 249
 250       if (!anim || XPending(dpy)) {
 251          XEvent event;
 252          XNextEvent(dpy, &event);
 253
 254          switch (event.type) {
 255          case Expose:
 256             redraw = 1;
 257             break;
 258          case ConfigureNotify:
 259             reshape(event.xconfigure.width, event.xconfigure.height);
 260             break;
 261          case KeyPress:
 262             {
 263                char buffer[10];
 264                int r, code;
 265                code = XLookupKeysym(&event.xkey, 0);
 266                if (code == XK_Left) {
 267                view_posx -= 1.0;
 268                }
 269                else if (code == XK_Right) {
 270                   view_posx += 1.0;
 271                }
 272                else if (code == XK_Up) {
 273                   view_posy += 1.0;
 274                }
 275                else if (code == XK_Down) {
 276                   view_posy -= 1.0;
 277                }
 278                else {
 279                   r = XLookupString(&event.xkey, buffer, sizeof(buffer),
 280                                     NULL, NULL);
 281                   if (buffer[0] == ' ') {
 282                      anim = !anim;
 283                   }
 284                   else if (buffer[0] == 'w') {
 285                      width -= 1.0f;
 286                   }
 287                   else if (buffer[0] == 'W') {
 288                      width += 1.0f;
 289                   }
 290                   else if (buffer[0] == 'h') {
 291                      height -= 1.0f;
 292                   }
 293                   else if (buffer[0] == 'H') {
 294                      height += 1.0f;
 295                   }
 296                   else if (buffer[0] == 27) {
 297                      /* escape */
 298                      return;
 299                   }
 300                }
 301             }
 302             redraw = 1;
 303             break;
 304          default:
 305             ; /*no-op*/
 306          }
 307       }
 308
 309       if (anim) {
 310          view_posx += 1.0;
 311          view_posy += 2.0;
 312          redraw = 1;
 313       }
 314
 315       if (redraw) {
 316          draw();
 317          eglSwapBuffers(egl_dpy, egl_surf);
 318       }
 319    }
 320 }
 321
 322
 323 static void
 324 usage(void)
 325 {
 326    printf("Usage:\n");
 327    printf("  -display <displayname>  set the display to run on\n");
 328    printf("  -info                   display OpenGL renderer info\n");
 329 }
 330
 331
 332 int
 333 main(int argc, char *argv[])
 334 {
 335    const int winWidth = 400, winHeight = 300;
 336    Display *x_dpy;
 337    Window win;
 338    EGLSurface egl_surf;
 339    EGLContext egl_ctx;
 340    EGLDisplay egl_dpy;
 341    char *dpyName = NULL;
 342    GLboolean printInfo = GL_FALSE;
 343    EGLint egl_major, egl_minor;
 344    int i;
 345    const char *s;
 346
 347    for (i = 1; i < argc; i++) {
 348       if (strcmp(argv[i], "-display") == 0) {
 349          dpyName = argv[i+1];
 350          i++;
 351       }
 352       else if (strcmp(argv[i], "-info") == 0) {
 353          printInfo = GL_TRUE;
 354       }
 355       else {
 356          usage();
 357          return -1;
 358       }
 359    }
 360
 361    x_dpy = XOpenDisplay(dpyName);
 362    if (!x_dpy) {
 363       printf("Error: couldn't open display %s\n",
 364              dpyName ? dpyName : getenv("DISPLAY"));
 365       return -1;
 366    }
 367
 368    egl_dpy = eglGetDisplay(x_dpy);
 369    if (!egl_dpy) {
 370       printf("Error: eglGetDisplay() failed\n");
 371       return -1;
 372    }
 373
 374    if (!eglInitialize(egl_dpy, &egl_major, &egl_minor)) {
 375       printf("Error: eglInitialize() failed\n");
 376       return -1;
 377    }
 378
 379    s = eglQueryString(egl_dpy, EGL_VERSION);
 380    printf("EGL_VERSION = %s\n", s);
 381
 382    s = eglQueryString(egl_dpy, EGL_VENDOR);
 383    printf("EGL_VENDOR = %s\n", s);
 384
 385    s = eglQueryString(egl_dpy, EGL_EXTENSIONS);
 386    printf("EGL_EXTENSIONS = %s\n", s);
 387
 388    s = eglQueryString(egl_dpy, EGL_CLIENT_APIS);
 389    printf("EGL_CLIENT_APIS = %s\n", s);
 390
 391    make_x_window(x_dpy, egl_dpy,
 392                  "drawtex", 0, 0, winWidth, winHeight,
 393                  &win, &egl_ctx, &egl_surf);
 394
 395    XMapWindow(x_dpy, win);
 396    if (!eglMakeCurrent(egl_dpy, egl_surf, egl_surf, egl_ctx)) {
 397       printf("Error: eglMakeCurrent() failed\n");
 398       return -1;
 399    }
 400
 401    if (printInfo) {
 402       printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 403       printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 404       printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 405       printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
 406    }
 407
 408    init();
 409
 410    /* Set initial projection/viewing transformation.
 411     * We can't be sure we'll get a ConfigureNotify event when the window
 412     * first appears.
 413     */
 414    reshape(winWidth, winHeight);
 415
 416    event_loop(x_dpy, win, egl_dpy, egl_surf);
 417
 418    eglDestroyContext(egl_dpy, egl_ctx);
 419    eglDestroySurface(egl_dpy, egl_surf);
 420    eglTerminate(egl_dpy);
 421
 422
 423    XDestroyWindow(x_dpy, win);
 424    XCloseDisplay(x_dpy);
 425
 426    return 0;
 427 }