clients/simple-egl.c

   1 /*
   2  * Copyright © 2011 Benjamin Franzke
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that copyright
   7  * notice and this permission notice appear in supporting documentation, and
   8  * that the name of the copyright holders not be used in advertising or
   9  * publicity pertaining to distribution of the software without specific,
  10  * written prior permission.  The copyright holders make no representations
  11  * about the suitability of this software for any purpose.  It is provided "as
  12  * is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  20  * OF THIS SOFTWARE.
  21  */
  22
  23 #include "config.h"
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <stdbool.h>
  29 #include <math.h>
  30 #include <assert.h>
  31 #include <signal.h>
  32
  33 #include <linux/input.h>
  34
  35 #include <wayland-client.h>
  36 #include <wayland-egl.h>
  37 #include <wayland-cursor.h>
  38
  39 #include <GLES2/gl2.h>
  40 #include <EGL/egl.h>
  41 #include <EGL/eglext.h>
  42
  43 #include "xdg-shell-client-protocol.h"
  44
  45 #ifndef EGL_EXT_swap_buffers_with_damage
  46 #define EGL_EXT_swap_buffers_with_damage 1
  47 typedef EGLBoolean (EGLAPIENTRYP PFNEGLSWAPBUFFERSWITHDAMAGEEXTPROC)(EGLDisplay dpy, EGLSurface surface, EGLint *rects, EGLint n_rects);
  48 #endif
  49
  50 #ifndef EGL_EXT_buffer_age
  51 #define EGL_EXT_buffer_age 1
  52 #define EGL_BUFFER_AGE_EXT                      0x313D
  53 #endif
  54
  55 struct window;
  56 struct seat;
  57
  58 struct display {
  59         struct wl_display *display;
  60         struct wl_registry *registry;
  61         struct wl_compositor *compositor;
  62         struct xdg_shell *shell;
  63         struct wl_seat *seat;
  64         struct wl_pointer *pointer;
  65         struct wl_touch *touch;
  66         struct wl_keyboard *keyboard;
  67         struct wl_shm *shm;
  68         struct wl_cursor_theme *cursor_theme;
  69         struct wl_cursor *default_cursor;
  70         struct wl_surface *cursor_surface;
  71         struct {
  72                 EGLDisplay dpy;
  73                 EGLContext ctx;
  74                 EGLConfig conf;
  75         } egl;
  76         struct window *window;
  77
  78         PFNEGLSWAPBUFFERSWITHDAMAGEEXTPROC swap_buffers_with_damage;
  79 };
  80
  81 struct geometry {
  82         int width, height;
  83 };
  84
  85 struct window {
  86         struct display *display;
  87         struct geometry geometry, window_size;
  88         struct {
  89                 GLuint rotation_uniform;
  90                 GLuint pos;
  91                 GLuint col;
  92         } gl;
  93
  94         uint32_t benchmark_time, frames;
  95         struct wl_egl_window *native;
  96         struct wl_surface *surface;
  97         struct xdg_surface *xdg_surface;
  98         EGLSurface egl_surface;
  99         struct wl_callback *callback;
 100         int fullscreen, opaque, buffer_size, frame_sync;
 101 };
 102
 103 static const char *vert_shader_text =
 104         "uniform mat4 rotation;\n"
 105         "attribute vec4 pos;\n"
 106         "attribute vec4 color;\n"
 107         "varying vec4 v_color;\n"
 108         "void main() {\n"
 109         "  gl_Position = rotation * pos;\n"
 110         "  v_color = color;\n"
 111         "}\n";
 112
 113 static const char *frag_shader_text =
 114         "precision mediump float;\n"
 115         "varying vec4 v_color;\n"
 116         "void main() {\n"
 117         "  gl_FragColor = v_color;\n"
 118         "}\n";
 119
 120 static int running = 1;
 121
 122 static void
 123 init_egl(struct display *display, struct window *window)
 124 {
 125         static const EGLint context_attribs[] = {
 126                 EGL_CONTEXT_CLIENT_VERSION, 2,
 127                 EGL_NONE
 128         };
 129         const char *extensions;
 130
 131         EGLint config_attribs[] = {
 132                 EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 133                 EGL_RED_SIZE, 1,
 134                 EGL_GREEN_SIZE, 1,
 135                 EGL_BLUE_SIZE, 1,
 136                 EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
 137                 EGL_NONE
 138         };
 139
 140         EGLint major, minor, n, count, i, size;
 141         EGLConfig *configs;
 142         EGLBoolean ret;
 143
 144         if (window->opaque || window->buffer_size == 16)
 145                 config_attribs[9] = 0;
 146
 147         display->egl.dpy = eglGetDisplay(display->display);
 148         assert(display->egl.dpy);
 149
 150         ret = eglInitialize(display->egl.dpy, &major, &minor);
 151         assert(ret == EGL_TRUE);
 152         ret = eglBindAPI(EGL_OPENGL_ES_API);
 153         assert(ret == EGL_TRUE);
 154
 155         if (!eglGetConfigs(display->egl.dpy, NULL, 0, &count) || count < 1)
 156                 assert(0);
 157
 158         configs = calloc(count, sizeof *configs);
 159         assert(configs);
 160
 161         ret = eglChooseConfig(display->egl.dpy, config_attribs,
 162                               configs, count, &n);
 163         assert(ret && n >= 1);
 164
 165         for (i = 0; i < n; i++) {
 166                 eglGetConfigAttrib(display->egl.dpy,
 167                                    configs[i], EGL_BUFFER_SIZE, &size);
 168                 if (window->buffer_size == size) {
 169                         display->egl.conf = configs[i];
 170                         break;
 171                 }
 172         }
 173         free(configs);
 174         if (display->egl.conf == NULL) {
 175                 fprintf(stderr, "did not find config with buffer size %d\n",
 176                         window->buffer_size);
 177                 exit(EXIT_FAILURE);
 178         }
 179
 180         display->egl.ctx = eglCreateContext(display->egl.dpy,
 181                                             display->egl.conf,
 182                                             EGL_NO_CONTEXT, context_attribs);
 183         assert(display->egl.ctx);
 184
 185         display->swap_buffers_with_damage = NULL;
 186         extensions = eglQueryString(display->egl.dpy, EGL_EXTENSIONS);
 187         if (extensions &&
 188             strstr(extensions, "EGL_EXT_swap_buffers_with_damage") &&
 189             strstr(extensions, "EGL_EXT_buffer_age"))
 190                 display->swap_buffers_with_damage =
 191                         (PFNEGLSWAPBUFFERSWITHDAMAGEEXTPROC)
 192                         eglGetProcAddress("eglSwapBuffersWithDamageEXT");
 193
 194         if (display->swap_buffers_with_damage)
 195                 printf("has EGL_EXT_buffer_age and EGL_EXT_swap_buffers_with_damage\n");
 196
 197 }
 198
 199 static void
 200 fini_egl(struct display *display)
 201 {
 202         eglTerminate(display->egl.dpy);
 203         eglReleaseThread();
 204 }
 205
 206 static GLuint
 207 create_shader(struct window *window, const char *source, GLenum shader_type)
 208 {
 209         GLuint shader;
 210         GLint status;
 211
 212         shader = glCreateShader(shader_type);
 213         assert(shader != 0);
 214
 215         glShaderSource(shader, 1, (const char **) &source, NULL);
 216         glCompileShader(shader);
 217
 218         glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
 219         if (!status) {
 220                 char log[1000];
 221                 GLsizei len;
 222                 glGetShaderInfoLog(shader, 1000, &len, log);
 223                 fprintf(stderr, "Error: compiling %s: %*s\n",
 224                         shader_type == GL_VERTEX_SHADER ? "vertex" : "fragment",
 225                         len, log);
 226                 exit(1);
 227         }
 228
 229         return shader;
 230 }
 231
 232 static void
 233 init_gl(struct window *window)
 234 {
 235         GLuint frag, vert;
 236         GLuint program;
 237         GLint status;
 238
 239         frag = create_shader(window, frag_shader_text, GL_FRAGMENT_SHADER);
 240         vert = create_shader(window, vert_shader_text, GL_VERTEX_SHADER);
 241
 242         program = glCreateProgram();
 243         glAttachShader(program, frag);
 244         glAttachShader(program, vert);
 245         glLinkProgram(program);
 246
 247         glGetProgramiv(program, GL_LINK_STATUS, &status);
 248         if (!status) {
 249                 char log[1000];
 250                 GLsizei len;
 251                 glGetProgramInfoLog(program, 1000, &len, log);
 252                 fprintf(stderr, "Error: linking:\n%*s\n", len, log);
 253                 exit(1);
 254         }
 255
 256         glUseProgram(program);
 257
 258         window->gl.pos = 0;
 259         window->gl.col = 1;
 260
 261         glBindAttribLocation(program, window->gl.pos, "pos");
 262         glBindAttribLocation(program, window->gl.col, "color");
 263         glLinkProgram(program);
 264
 265         window->gl.rotation_uniform =
 266                 glGetUniformLocation(program, "rotation");
 267 }
 268
 269 static void
 270 handle_surface_configure(void *data, struct xdg_surface *surface,
 271                          int32_t width, int32_t height,
 272                          struct wl_array *states, uint32_t serial)
 273 {
 274         struct window *window = data;
 275         uint32_t *p;
 276
 277         window->fullscreen = 0;
 278         wl_array_for_each(p, states) {
 279                 uint32_t state = *p;
 280                 switch (state) {
 281                 case XDG_SURFACE_STATE_FULLSCREEN:
 282                         window->fullscreen = 1;
 283                         break;
 284                 }
 285         }
 286
 287         if (width > 0 && height > 0) {
 288                 if (!window->fullscreen) {
 289                         window->window_size.width = width;
 290                         window->window_size.height = height;
 291                 }
 292                 window->geometry.width = width;
 293                 window->geometry.height = height;
 294         } else if (!window->fullscreen) {
 295                 window->geometry = window->window_size;
 296         }
 297
 298         if (window->native)
 299                 wl_egl_window_resize(window->native,
 300                                      window->geometry.width,
 301                                      window->geometry.height, 0, 0);
 302
 303         xdg_surface_ack_configure(surface, serial);
 304 }
 305
 306 static void
 307 handle_surface_delete(void *data, struct xdg_surface *xdg_surface)
 308 {
 309         running = 0;
 310 }
 311
 312 static const struct xdg_surface_listener xdg_surface_listener = {
 313         handle_surface_configure,
 314         handle_surface_delete,
 315 };
 316
 317 static void
 318 create_surface(struct window *window)
 319 {
 320         struct display *display = window->display;
 321         EGLBoolean ret;
 322
 323         window->surface = wl_compositor_create_surface(display->compositor);
 324         window->xdg_surface = xdg_shell_get_xdg_surface(display->shell,
 325                                                         window->surface);
 326
 327         xdg_surface_add_listener(window->xdg_surface,
 328                                  &xdg_surface_listener, window);
 329
 330         window->native =
 331                 wl_egl_window_create(window->surface,
 332                                      window->geometry.width,
 333                                      window->geometry.height);
 334         window->egl_surface =
 335                 eglCreateWindowSurface(display->egl.dpy,
 336                                        display->egl.conf,
 337                                        window->native, NULL);
 338
 339         xdg_surface_set_title(window->xdg_surface, "simple-egl");
 340
 341         ret = eglMakeCurrent(window->display->egl.dpy, window->egl_surface,
 342                              window->egl_surface, window->display->egl.ctx);
 343         assert(ret == EGL_TRUE);
 344
 345         if (!window->frame_sync)
 346                 eglSwapInterval(display->egl.dpy, 0);
 347
 348         if (window->fullscreen)
 349                 xdg_surface_set_fullscreen(window->xdg_surface, NULL);
 350 }
 351
 352 static void
 353 destroy_surface(struct window *window)
 354 {
 355         /* Required, otherwise segfault in egl_dri2.c: dri2_make_current()
 356          * on eglReleaseThread(). */
 357         eglMakeCurrent(window->display->egl.dpy, EGL_NO_SURFACE, EGL_NO_SURFACE,
 358                        EGL_NO_CONTEXT);
 359
 360         eglDestroySurface(window->display->egl.dpy, window->egl_surface);
 361         wl_egl_window_destroy(window->native);
 362
 363         xdg_surface_destroy(window->xdg_surface);
 364         wl_surface_destroy(window->surface);
 365
 366         if (window->callback)
 367                 wl_callback_destroy(window->callback);
 368 }
 369
 370 static void
 371 redraw(void *data, struct wl_callback *callback, uint32_t time)
 372 {
 373         struct window *window = data;
 374         struct display *display = window->display;
 375         static const GLfloat verts[3][2] = {
 376                 { -0.5, -0.5 },
 377                 {  0.5, -0.5 },
 378                 {  0,    0.5 }
 379         };
 380         static const GLfloat colors[3][3] = {
 381                 { 1, 0, 0 },
 382                 { 0, 1, 0 },
 383                 { 0, 0, 1 }
 384         };
 385         GLfloat angle;
 386         GLfloat rotation[4][4] = {
 387                 { 1, 0, 0, 0 },
 388                 { 0, 1, 0, 0 },
 389                 { 0, 0, 1, 0 },
 390                 { 0, 0, 0, 1 }
 391         };
 392         static const uint32_t speed_div = 5, benchmark_interval = 5;
 393         struct wl_region *region;
 394         EGLint rect[4];
 395         EGLint buffer_age = 0;
 396         struct timeval tv;
 397
 398         assert(window->callback == callback);
 399         window->callback = NULL;
 400
 401         if (callback)
 402                 wl_callback_destroy(callback);
 403
 404         gettimeofday(&tv, NULL);
 405         time = tv.tv_sec * 1000 + tv.tv_usec / 1000;
 406         if (window->frames == 0)
 407                 window->benchmark_time = time;
 408         if (time - window->benchmark_time > (benchmark_interval * 1000)) {
 409                 printf("%d frames in %d seconds: %f fps\n",
 410                        window->frames,
 411                        benchmark_interval,
 412                        (float) window->frames / benchmark_interval);
 413                 window->benchmark_time = time;
 414                 window->frames = 0;
 415         }
 416
 417         angle = (time / speed_div) % 360 * M_PI / 180.0;
 418         rotation[0][0] =  cos(angle);
 419         rotation[0][2] =  sin(angle);
 420         rotation[2][0] = -sin(angle);
 421         rotation[2][2] =  cos(angle);
 422
 423         if (display->swap_buffers_with_damage)
 424                 eglQuerySurface(display->egl.dpy, window->egl_surface,
 425                                 EGL_BUFFER_AGE_EXT, &buffer_age);
 426
 427         glViewport(0, 0, window->geometry.width, window->geometry.height);
 428
 429         glUniformMatrix4fv(window->gl.rotation_uniform, 1, GL_FALSE,
 430                            (GLfloat *) rotation);
 431
 432         glClearColor(0.0, 0.0, 0.0, 0.5);
 433         glClear(GL_COLOR_BUFFER_BIT);
 434
 435         glVertexAttribPointer(window->gl.pos, 2, GL_FLOAT, GL_FALSE, 0, verts);
 436         glVertexAttribPointer(window->gl.col, 3, GL_FLOAT, GL_FALSE, 0, colors);
 437         glEnableVertexAttribArray(window->gl.pos);
 438         glEnableVertexAttribArray(window->gl.col);
 439
 440         glDrawArrays(GL_TRIANGLES, 0, 3);
 441
 442         glDisableVertexAttribArray(window->gl.pos);
 443         glDisableVertexAttribArray(window->gl.col);
 444
 445         if (window->opaque || window->fullscreen) {
 446                 region = wl_compositor_create_region(window->display->compositor);
 447                 wl_region_add(region, 0, 0,
 448                               window->geometry.width,
 449                               window->geometry.height);
 450                 wl_surface_set_opaque_region(window->surface, region);
 451                 wl_region_destroy(region);
 452         } else {
 453                 wl_surface_set_opaque_region(window->surface, NULL);
 454         }
 455
 456         if (display->swap_buffers_with_damage && buffer_age > 0) {
 457                 rect[0] = window->geometry.width / 4 - 1;
 458                 rect[1] = window->geometry.height / 4 - 1;
 459                 rect[2] = window->geometry.width / 2 + 2;
 460                 rect[3] = window->geometry.height / 2 + 2;
 461                 display->swap_buffers_with_damage(display->egl.dpy,
 462                                                   window->egl_surface,
 463                                                   rect, 1);
 464         } else {
 465                 eglSwapBuffers(display->egl.dpy, window->egl_surface);
 466         }
 467         window->frames++;
 468 }
 469
 470 static void
 471 pointer_handle_enter(void *data, struct wl_pointer *pointer,
 472                      uint32_t serial, struct wl_surface *surface,
 473                      wl_fixed_t sx, wl_fixed_t sy)
 474 {
 475         struct display *display = data;
 476         struct wl_buffer *buffer;
 477         struct wl_cursor *cursor = display->default_cursor;
 478         struct wl_cursor_image *image;
 479
 480         if (display->window->fullscreen)
 481                 wl_pointer_set_cursor(pointer, serial, NULL, 0, 0);
 482         else if (cursor) {
 483                 image = display->default_cursor->images[0];
 484                 buffer = wl_cursor_image_get_buffer(image);
 485                 if (!buffer)
 486                         return;
 487                 wl_pointer_set_cursor(pointer, serial,
 488                                       display->cursor_surface,
 489                                       image->hotspot_x,
 490                                       image->hotspot_y);
 491                 wl_surface_attach(display->cursor_surface, buffer, 0, 0);
 492                 wl_surface_damage(display->cursor_surface, 0, 0,
 493                                   image->width, image->height);
 494                 wl_surface_commit(display->cursor_surface);
 495         }
 496 }
 497
 498 static void
 499 pointer_handle_leave(void *data, struct wl_pointer *pointer,
 500                      uint32_t serial, struct wl_surface *surface)
 501 {
 502 }
 503
 504 static void
 505 pointer_handle_motion(void *data, struct wl_pointer *pointer,
 506                       uint32_t time, wl_fixed_t sx, wl_fixed_t sy)
 507 {
 508 }
 509
 510 static void
 511 pointer_handle_button(void *data, struct wl_pointer *wl_pointer,
 512                       uint32_t serial, uint32_t time, uint32_t button,
 513                       uint32_t state)
 514 {
 515         struct display *display = data;
 516
 517         if (button == BTN_LEFT && state == WL_POINTER_BUTTON_STATE_PRESSED)
 518                 xdg_surface_move(display->window->xdg_surface,
 519                                  display->seat, serial);
 520 }
 521
 522 static void
 523 pointer_handle_axis(void *data, struct wl_pointer *wl_pointer,
 524                     uint32_t time, uint32_t axis, wl_fixed_t value)
 525 {
 526 }
 527
 528 static const struct wl_pointer_listener pointer_listener = {
 529         pointer_handle_enter,
 530         pointer_handle_leave,
 531         pointer_handle_motion,
 532         pointer_handle_button,
 533         pointer_handle_axis,
 534 };
 535
 536 static void
 537 touch_handle_down(void *data, struct wl_touch *wl_touch,
 538                   uint32_t serial, uint32_t time, struct wl_surface *surface,
 539                   int32_t id, wl_fixed_t x_w, wl_fixed_t y_w)
 540 {
 541         struct display *d = (struct display *)data;
 542
 543         xdg_surface_move(d->window->xdg_surface, d->seat, serial);
 544 }
 545
 546 static void
 547 touch_handle_up(void *data, struct wl_touch *wl_touch,
 548                 uint32_t serial, uint32_t time, int32_t id)
 549 {
 550 }
 551
 552 static void
 553 touch_handle_motion(void *data, struct wl_touch *wl_touch,
 554                     uint32_t time, int32_t id, wl_fixed_t x_w, wl_fixed_t y_w)
 555 {
 556 }
 557
 558 static void
 559 touch_handle_frame(void *data, struct wl_touch *wl_touch)
 560 {
 561 }
 562
 563 static void
 564 touch_handle_cancel(void *data, struct wl_touch *wl_touch)
 565 {
 566 }
 567
 568 static const struct wl_touch_listener touch_listener = {
 569         touch_handle_down,
 570         touch_handle_up,
 571         touch_handle_motion,
 572         touch_handle_frame,
 573         touch_handle_cancel,
 574 };
 575
 576 static void
 577 keyboard_handle_keymap(void *data, struct wl_keyboard *keyboard,
 578                        uint32_t format, int fd, uint32_t size)
 579 {
 580 }
 581
 582 static void
 583 keyboard_handle_enter(void *data, struct wl_keyboard *keyboard,
 584                       uint32_t serial, struct wl_surface *surface,
 585                       struct wl_array *keys)
 586 {
 587 }
 588
 589 static void
 590 keyboard_handle_leave(void *data, struct wl_keyboard *keyboard,
 591                       uint32_t serial, struct wl_surface *surface)
 592 {
 593 }
 594
 595 static void
 596 keyboard_handle_key(void *data, struct wl_keyboard *keyboard,
 597                     uint32_t serial, uint32_t time, uint32_t key,
 598                     uint32_t state)
 599 {
 600         struct display *d = data;
 601
 602         if (key == KEY_F11 && state) {
 603                 if (d->window->fullscreen)
 604                         xdg_surface_unset_fullscreen(d->window->xdg_surface);
 605                 else
 606                         xdg_surface_set_fullscreen(d->window->xdg_surface, NULL);
 607         } else if (key == KEY_ESC && state)
 608                 running = 0;
 609 }
 610
 611 static void
 612 keyboard_handle_modifiers(void *data, struct wl_keyboard *keyboard,
 613                           uint32_t serial, uint32_t mods_depressed,
 614                           uint32_t mods_latched, uint32_t mods_locked,
 615                           uint32_t group)
 616 {
 617 }
 618
 619 static const struct wl_keyboard_listener keyboard_listener = {
 620         keyboard_handle_keymap,
 621         keyboard_handle_enter,
 622         keyboard_handle_leave,
 623         keyboard_handle_key,
 624         keyboard_handle_modifiers,
 625 };
 626
 627 static void
 628 seat_handle_capabilities(void *data, struct wl_seat *seat,
 629                          enum wl_seat_capability caps)
 630 {
 631         struct display *d = data;
 632
 633         if ((caps & WL_SEAT_CAPABILITY_POINTER) && !d->pointer) {
 634                 d->pointer = wl_seat_get_pointer(seat);
 635                 wl_pointer_add_listener(d->pointer, &pointer_listener, d);
 636         } else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && d->pointer) {
 637                 wl_pointer_destroy(d->pointer);
 638                 d->pointer = NULL;
 639         }
 640
 641         if ((caps & WL_SEAT_CAPABILITY_KEYBOARD) && !d->keyboard) {
 642                 d->keyboard = wl_seat_get_keyboard(seat);
 643                 wl_keyboard_add_listener(d->keyboard, &keyboard_listener, d);
 644         } else if (!(caps & WL_SEAT_CAPABILITY_KEYBOARD) && d->keyboard) {
 645                 wl_keyboard_destroy(d->keyboard);
 646                 d->keyboard = NULL;
 647         }
 648
 649         if ((caps & WL_SEAT_CAPABILITY_TOUCH) && !d->touch) {
 650                 d->touch = wl_seat_get_touch(seat);
 651                 wl_touch_set_user_data(d->touch, d);
 652                 wl_touch_add_listener(d->touch, &touch_listener, d);
 653         } else if (!(caps & WL_SEAT_CAPABILITY_TOUCH) && d->touch) {
 654                 wl_touch_destroy(d->touch);
 655                 d->touch = NULL;
 656         }
 657 }
 658
 659 static const struct wl_seat_listener seat_listener = {
 660         seat_handle_capabilities,
 661 };
 662
 663 static void
 664 xdg_shell_ping(void *data, struct xdg_shell *shell, uint32_t serial)
 665 {
 666         xdg_shell_pong(shell, serial);
 667 }
 668
 669 static const struct xdg_shell_listener xdg_shell_listener = {
 670         xdg_shell_ping,
 671 };
 672
 673 #define XDG_VERSION 3 /* The version of xdg-shell that we implement */
 674 #ifdef static_assert
 675 static_assert(XDG_VERSION == XDG_SHELL_VERSION_CURRENT,
 676               "Interface version doesn't match implementation version");
 677 #endif
 678
 679 static void
 680 registry_handle_global(void *data, struct wl_registry *registry,
 681                        uint32_t name, const char *interface, uint32_t version)
 682 {
 683         struct display *d = data;
 684
 685         if (strcmp(interface, "wl_compositor") == 0) {
 686                 d->compositor =
 687                         wl_registry_bind(registry, name,
 688                                          &wl_compositor_interface, 1);
 689         } else if (strcmp(interface, "xdg_shell") == 0) {
 690                 d->shell = wl_registry_bind(registry, name,
 691                                             &xdg_shell_interface, 1);
 692                 xdg_shell_add_listener(d->shell, &xdg_shell_listener, d);
 693                 xdg_shell_use_unstable_version(d->shell, XDG_VERSION);
 694         } else if (strcmp(interface, "wl_seat") == 0) {
 695                 d->seat = wl_registry_bind(registry, name,
 696                                            &wl_seat_interface, 1);
 697                 wl_seat_add_listener(d->seat, &seat_listener, d);
 698         } else if (strcmp(interface, "wl_shm") == 0) {
 699                 d->shm = wl_registry_bind(registry, name,
 700                                           &wl_shm_interface, 1);
 701                 d->cursor_theme = wl_cursor_theme_load(NULL, 32, d->shm);
 702                 if (!d->cursor_theme) {
 703                         fprintf(stderr, "unable to load default theme\n");
 704                         return;
 705                 }
 706                 d->default_cursor =
 707                         wl_cursor_theme_get_cursor(d->cursor_theme, "left_ptr");
 708                 if (!d->default_cursor) {
 709                         fprintf(stderr, "unable to load default left pointer\n");
 710                         // TODO: abort ?
 711                 }
 712         }
 713 }
 714
 715 static void
 716 registry_handle_global_remove(void *data, struct wl_registry *registry,
 717                               uint32_t name)
 718 {
 719 }
 720
 721 static const struct wl_registry_listener registry_listener = {
 722         registry_handle_global,
 723         registry_handle_global_remove
 724 };
 725
 726 static void
 727 signal_int(int signum)
 728 {
 729         running = 0;
 730 }
 731
 732 static void
 733 usage(int error_code)
 734 {
 735         fprintf(stderr, "Usage: simple-egl [OPTIONS]\n\n"
 736                 "  -f\tRun in fullscreen mode\n"
 737                 "  -o\tCreate an opaque surface\n"
 738                 "  -s\tUse a 16 bpp EGL config\n"
 739                 "  -b\tDon't sync to compositor redraw (eglSwapInterval 0)\n"
 740                 "  -h\tThis help text\n\n");
 741
 742         exit(error_code);
 743 }
 744
 745 int
 746 main(int argc, char **argv)
 747 {
 748         struct sigaction sigint;
 749         struct display display = { 0 };
 750         struct window  window  = { 0 };
 751         int i, ret = 0;
 752
 753         window.display = &display;
 754         display.window = &window;
 755         window.geometry.width  = 250;
 756         window.geometry.height = 250;
 757         window.window_size = window.geometry;
 758         window.buffer_size = 32;
 759         window.frame_sync = 1;
 760
 761         for (i = 1; i < argc; i++) {
 762                 if (strcmp("-f", argv[i]) == 0)
 763                         window.fullscreen = 1;
 764                 else if (strcmp("-o", argv[i]) == 0)
 765                         window.opaque = 1;
 766                 else if (strcmp("-s", argv[i]) == 0)
 767                         window.buffer_size = 16;
 768                 else if (strcmp("-b", argv[i]) == 0)
 769                         window.frame_sync = 0;
 770                 else if (strcmp("-h", argv[i]) == 0)
 771                         usage(EXIT_SUCCESS);
 772                 else
 773                         usage(EXIT_FAILURE);
 774         }
 775
 776         display.display = wl_display_connect(NULL);
 777         assert(display.display);
 778
 779         display.registry = wl_display_get_registry(display.display);
 780         wl_registry_add_listener(display.registry,
 781                                  &registry_listener, &display);
 782
 783         wl_display_dispatch(display.display);
 784
 785         init_egl(&display, &window);
 786         create_surface(&window);
 787         init_gl(&window);
 788
 789         display.cursor_surface =
 790                 wl_compositor_create_surface(display.compositor);
 791
 792         sigint.sa_handler = signal_int;
 793         sigemptyset(&sigint.sa_mask);
 794         sigint.sa_flags = SA_RESETHAND;
 795         sigaction(SIGINT, &sigint, NULL);
 796
 797         /* The mainloop here is a little subtle.  Redrawing will cause
 798          * EGL to read events so we can just call
 799          * wl_display_dispatch_pending() to handle any events that got
 800          * queued up as a side effect. */
 801         while (running && ret != -1) {
 802                 wl_display_dispatch_pending(display.display);
 803                 redraw(&window, NULL, 0);
 804         }
 805
 806         fprintf(stderr, "simple-egl exiting\n");
 807
 808         destroy_surface(&window);
 809         fini_egl(&display);
 810
 811         wl_surface_destroy(display.cursor_surface);
 812         if (display.cursor_theme)
 813                 wl_cursor_theme_destroy(display.cursor_theme);
 814
 815         if (display.shell)
 816                 xdg_shell_destroy(display.shell);
 817
 818         if (display.compositor)
 819                 wl_compositor_destroy(display.compositor);
 820
 821         wl_registry_destroy(display.registry);
 822         wl_display_flush(display.display);
 823         wl_display_disconnect(display.display);
 824
 825         return 0;
 826 }