progs/egl/eglut/eglut.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <stdarg.h>
   5 #include <sys/time.h>
   6
   7 #include "EGL/egl.h"
   8 #include "EGL/eglext.h"
   9
  10 #include "eglutint.h"
  11
  12 static struct eglut_state _eglut_state = {
  13    .api_mask = EGLUT_OPENGL_ES1_BIT,
  14    .window_width = 300,
  15    .window_height = 300,
  16    .verbose = 0,
  17    .num_windows = 0,
  18 };
  19
  20 struct eglut_state *_eglut = &_eglut_state;
  21
  22 void
  23 _eglutFatal(char *format, ...)
  24 {
  25   va_list args;
  26
  27   va_start(args, format);
  28
  29   fprintf(stderr, "EGLUT: ");
  30   vfprintf(stderr, format, args);
  31   va_end(args);
  32   putc('\n', stderr);
  33
  34   exit(1);
  35 }
  36
  37 /* return current time (in milliseconds) */
  38 int
  39 _eglutNow(void)
  40 {
  41    struct timeval tv;
  42 #ifdef __VMS
  43    (void) gettimeofday(&tv, NULL );
  44 #else
  45    struct timezone tz;
  46    (void) gettimeofday(&tv, &tz);
  47 #endif
  48    return tv.tv_sec * 1000 + tv.tv_usec / 1000;
  49 }
  50
  51 static void
  52 _eglutDestroyWindow(struct eglut_window *win)
  53 {
  54    if (_eglut->surface_type != EGL_PBUFFER_BIT &&
  55        _eglut->surface_type != EGL_SCREEN_BIT_MESA)
  56       eglDestroySurface(_eglut->dpy, win->surface);
  57
  58    _eglutNativeFiniWindow(win);
  59
  60    eglDestroyContext(_eglut->dpy, win->context);
  61 }
  62
  63 static EGLConfig
  64 _eglutChooseConfig(void)
  65 {
  66    EGLConfig config;
  67    EGLint config_attribs[32];
  68    EGLint renderable_type, num_configs, i;
  69
  70    i = 0;
  71    config_attribs[i++] = EGL_RED_SIZE;
  72    config_attribs[i++] = 1;
  73    config_attribs[i++] = EGL_GREEN_SIZE;
  74    config_attribs[i++] = 1;
  75    config_attribs[i++] = EGL_BLUE_SIZE;
  76    config_attribs[i++] = 1;
  77    config_attribs[i++] = EGL_DEPTH_SIZE;
  78    config_attribs[i++] = 1;
  79
  80    config_attribs[i++] = EGL_SURFACE_TYPE;
  81    config_attribs[i++] = _eglut->surface_type;
  82
  83    config_attribs[i++] = EGL_RENDERABLE_TYPE;
  84    renderable_type = 0x0;
  85    if (_eglut->api_mask & EGLUT_OPENGL_BIT)
  86       renderable_type |= EGL_OPENGL_BIT;
  87    if (_eglut->api_mask & (EGLUT_OPENGL_ES1_BIT | EGLUT_OPENGL_ES2_BIT))
  88       renderable_type |= EGL_OPENGL_ES_BIT;
  89    if (_eglut->api_mask & EGLUT_OPENVG_BIT)
  90       renderable_type |= EGL_OPENVG_BIT;
  91    config_attribs[i++] = renderable_type;
  92
  93    config_attribs[i] = EGL_NONE;
  94
  95    if (!eglChooseConfig(_eglut->dpy,
  96             config_attribs, &config, 1, &num_configs) || !num_configs)
  97       _eglutFatal("failed to choose a config");
  98
  99    return config;
 100 }
 101
 102 static struct eglut_window *
 103 _eglutCreateWindow(const char *title, int x, int y, int w, int h)
 104 {
 105    struct eglut_window *win;
 106    EGLint context_attribs[4];
 107    EGLint api, i;
 108
 109    win = calloc(1, sizeof(*win));
 110    if (!win)
 111       _eglutFatal("failed to allocate window");
 112
 113    win->config = _eglutChooseConfig();
 114
 115    i = 0;
 116    context_attribs[i] = EGL_NONE;
 117
 118    /* multiple APIs? */
 119
 120    api = EGL_OPENGL_ES_API;
 121    if (_eglut->api_mask & EGLUT_OPENGL_BIT) {
 122       api = EGL_OPENGL_API;
 123    }
 124    else if (_eglut->api_mask & EGLUT_OPENVG_BIT) {
 125       api = EGL_OPENVG_API;
 126    }
 127    else if (_eglut->api_mask & EGLUT_OPENGL_ES2_BIT) {
 128       context_attribs[i++] = EGL_CONTEXT_CLIENT_VERSION;
 129       context_attribs[i++] = 2;
 130    }
 131
 132    context_attribs[i] = EGL_NONE;
 133
 134    eglBindAPI(api);
 135    win->context = eglCreateContext(_eglut->dpy,
 136          win->config, EGL_NO_CONTEXT, context_attribs);
 137    if (!win->context)
 138       _eglutFatal("failed to create context");
 139
 140    _eglutNativeInitWindow(win, title, x, y, w, h);
 141    switch (_eglut->surface_type) {
 142    case EGL_WINDOW_BIT:
 143       win->surface = eglCreateWindowSurface(_eglut->dpy,
 144             win->config, win->native.u.window, NULL);
 145       break;
 146    case EGL_PIXMAP_BIT:
 147       win->surface = eglCreatePixmapSurface(_eglut->dpy,
 148             win->config, win->native.u.pixmap, NULL);
 149       break;
 150    case EGL_PBUFFER_BIT:
 151    case EGL_SCREEN_BIT_MESA:
 152       win->surface = win->native.u.surface;
 153       break;
 154    default:
 155       break;
 156    }
 157    if (win->surface == EGL_NO_SURFACE)
 158       _eglutFatal("failed to create surface");
 159
 160    return win;
 161 }
 162
 163 void
 164 eglutInitAPIMask(int mask)
 165 {
 166    _eglut->api_mask = mask;
 167 }
 168
 169 void
 170 eglutInitWindowSize(int width, int height)
 171 {
 172    _eglut->window_width = width;
 173    _eglut->window_height = height;
 174 }
 175
 176 void
 177 eglutInit(int argc, char **argv)
 178 {
 179    int i;
 180
 181    for (i = 1; i < argc; i++) {
 182       if (strcmp(argv[i], "-display") == 0)
 183          _eglut->display_name = argv[++i];
 184       else if (strcmp(argv[i], "-info") == 0) {
 185          _eglut->verbose = 1;
 186       }
 187    }
 188
 189    _eglutNativeInitDisplay();
 190    _eglut->dpy = eglGetDisplay(_eglut->native_dpy);
 191
 192    if (!eglInitialize(_eglut->dpy, &_eglut->major, &_eglut->minor))
 193       _eglutFatal("failed to initialize EGL display");
 194
 195    _eglut->init_time = _eglutNow();
 196
 197    printf("EGL_VERSION = %s\n", eglQueryString(_eglut->dpy, EGL_VERSION));
 198    if (_eglut->verbose) {
 199       printf("EGL_VENDOR = %s\n", eglQueryString(_eglut->dpy, EGL_VENDOR));
 200       printf("EGL_EXTENSIONS = %s\n",
 201             eglQueryString(_eglut->dpy, EGL_EXTENSIONS));
 202       printf("EGL_CLIENT_APIS = %s\n",
 203             eglQueryString(_eglut->dpy, EGL_CLIENT_APIS));
 204    }
 205 }
 206
 207 int
 208 eglutGet(int state)
 209 {
 210    int val;
 211
 212    switch (state) {
 213    case EGLUT_ELAPSED_TIME:
 214       val = _eglutNow() - _eglut->init_time;
 215       break;
 216    default:
 217       val = -1;
 218       break;
 219    }
 220
 221    return val;
 222 }
 223
 224 void
 225 eglutIdleFunc(EGLUTidleCB func)
 226 {
 227    _eglut->idle_cb = func;
 228 }
 229
 230 void
 231 eglutPostRedisplay(void)
 232 {
 233    _eglut->redisplay = 1;
 234 }
 235
 236 void
 237 eglutMainLoop(void)
 238 {
 239    struct eglut_window *win = _eglut->current;
 240
 241    if (!win)
 242       _eglutFatal("no window is created\n");
 243
 244    if (win->reshape_cb)
 245       win->reshape_cb(win->native.width, win->native.height);
 246
 247    _eglutNativeEventLoop();
 248 }
 249
 250 static void
 251 _eglutFini(void)
 252 {
 253    eglTerminate(_eglut->dpy);
 254    _eglutNativeFiniDisplay();
 255 }
 256
 257 void
 258 eglutDestroyWindow(int win)
 259 {
 260    struct eglut_window *window = _eglut->current;
 261
 262    if (window->index != win)
 263       return;
 264
 265    /* XXX it causes some bug in st/egl KMS backend */
 266    if ( _eglut->surface_type != EGL_SCREEN_BIT_MESA)
 267       eglMakeCurrent(_eglut->dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
 268
 269    _eglutDestroyWindow(_eglut->current);
 270 }
 271
 272 static void
 273 _eglutDefaultKeyboard(unsigned char key)
 274 {
 275    if (key == 27) {
 276       if (_eglut->current)
 277          eglutDestroyWindow(_eglut->current->index);
 278       _eglutFini();
 279
 280       exit(0);
 281    }
 282 }
 283
 284 int
 285 eglutCreateWindow(const char *title)
 286 {
 287    struct eglut_window *win;
 288
 289    win = _eglutCreateWindow(title, 0, 0,
 290          _eglut->window_width, _eglut->window_height);
 291
 292    win->index = _eglut->num_windows++;
 293    win->reshape_cb = NULL;
 294    win->display_cb = NULL;
 295    win->keyboard_cb = _eglutDefaultKeyboard;
 296    win->special_cb = NULL;
 297
 298    if (!eglMakeCurrent(_eglut->dpy, win->surface, win->surface, win->context))
 299       _eglutFatal("failed to make window current");
 300    _eglut->current = win;
 301
 302    return win->index;
 303 }
 304
 305 int
 306 eglutGetWindowWidth(void)
 307 {
 308    struct eglut_window *win = _eglut->current;
 309    return win->native.width;
 310 }
 311
 312 int
 313 eglutGetWindowHeight(void)
 314 {
 315    struct eglut_window *win = _eglut->current;
 316    return win->native.height;
 317 }
 318
 319 void
 320 eglutDisplayFunc(EGLUTdisplayCB func)
 321 {
 322    struct eglut_window *win = _eglut->current;
 323    win->display_cb = func;
 324
 325 }
 326
 327 void
 328 eglutReshapeFunc(EGLUTreshapeCB func)
 329 {
 330    struct eglut_window *win = _eglut->current;
 331    win->reshape_cb = func;
 332 }
 333
 334 void
 335 eglutKeyboardFunc(EGLUTkeyboardCB func)
 336 {
 337    struct eglut_window *win = _eglut->current;
 338    win->keyboard_cb = func;
 339 }
 340
 341 void
 342 eglutSpecialFunc(EGLUTspecialCB func)
 343 {
 344    struct eglut_window *win = _eglut->current;
 345    win->special_cb = func;
 346 }