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 <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <stdbool.h>
  27 #include <math.h>
  28 #include <assert.h>
  29 #include <signal.h>
  30
  31 #include <linux/input.h>
  32
  33 #include <wayland-client.h>
  34 #include <wayland-egl.h>
  35 #include <wayland-cursor.h>
  36
  37 #include <GLES2/gl2.h>
  38 #include <EGL/egl.h>
  39 #include <EGL/eglext.h>
  40
  41 #include "xdg-shell-client-protocol.h"
  42
  43 #ifndef EGL_EXT_swap_buffers_with_damage
  44 #define EGL_EXT_swap_buffers_with_damage 1
  45 typedef EGLBoolean (EGLAPIENTRYP PFNEGLSWAPBUFFERSWITHDAMAGEEXTPROC)(EGLDisplay dpy, EGLSurface surface, EGLint *rects, EGLint n_rects);
  46 #endif
  47
  48 #ifndef EGL_EXT_buffer_age
  49 #define EGL_EXT_buffer_age 1
  50 #define EGL_BUFFER_AGE_EXT                      0x313D
  51 #endif
  52
  53 struct window;
  54 struct seat;
  55
  56 struct display {
  57         struct wl_display *display;
  58         struct wl_registry *registry;
  59         struct wl_compositor *compositor;
  60         struct xdg_shell *shell;
  61         struct wl_seat *seat;
  62         struct wl_pointer *pointer;
  63         struct wl_touch *touch;
  64         struct wl_keyboard *keyboard;
  65         struct wl_shm *shm;
  66         struct wl_cursor_theme *cursor_theme;
  67         struct wl_cursor *default_cursor;
  68         struct wl_surface *cursor_surface;
  69         struct {
  70                 EGLDisplay dpy;
  71                 EGLContext ctx;
  72                 EGLConfig conf;
  73         } egl;
  74         struct window *window;
  75
  76         PFNEGLSWAPBUFFERSWITHDAMAGEEXTPROC swap_buffers_with_damage;
  77 };
  78
  79 struct geometry {
  80         int width, height;
  81 };
  82
  83 struct window {
  84         struct display *display;
  85         struct geometry geometry, window_size;
  86         struct {
  87                 GLuint rotation_uniform;
  88                 GLuint pos;
  89                 GLuint col;
  90         } gl;
  91
  92         uint32_t benchmark_time, frames;
  93         struct wl_egl_window *native;
  94         struct wl_surface *surface;
  95         struct xdg_surface *xdg_surface;
  96         EGLSurface egl_surface;
  97         struct wl_callback *callback;
  98         int fullscreen, configured, opaque, buffer_size, frame_sync;
  99 };
 100
 101 static const char *vert_shader_text =
 102         "uniform mat4 rotation;\n"
 103         "attribute vec4 pos;\n"
 104         "attribute vec4 color;\n"
 105         "varying vec4 v_color;\n"
 106         "void main() {\n"
 107         "  gl_Position = rotation * pos;\n"
 108         "  v_color = color;\n"
 109         "}\n";
 110
 111 static const char *frag_shader_text =
 112         "precision mediump float;\n"
 113         "varying vec4 v_color;\n"
 114         "void main() {\n"
 115         "  gl_FragColor = v_color;\n"
 116         "}\n";
 117
 118 static int running = 1;
 119
 120 static void
 121 init_egl(struct display *display, struct window *window)
 122 {
 123         static const EGLint context_attribs[] = {
 124                 EGL_CONTEXT_CLIENT_VERSION, 2,
 125                 EGL_NONE
 126         };
 127         const char *extensions;
 128
 129         EGLint config_attribs[] = {
 130                 EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 131                 EGL_RED_SIZE, 1,
 132                 EGL_GREEN_SIZE, 1,
 133                 EGL_BLUE_SIZE, 1,
 134                 EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
 135                 EGL_NONE
 136         };
 137
 138         EGLint major, minor, n, count, i, size;
 139         EGLConfig *configs;
 140         EGLBoolean ret;
 141
 142         if (window->opaque || window->buffer_size == 16)
 143                 config_attribs[9] = 0;
 144
 145         display->egl.dpy = eglGetDisplay(display->display);
 146         assert(display->egl.dpy);
 147
 148         ret = eglInitialize(display->egl.dpy, &major, &minor);
 149         assert(ret == EGL_TRUE);
 150         ret = eglBindAPI(EGL_OPENGL_ES_API);
 151         assert(ret == EGL_TRUE);
 152
 153         if (!eglGetConfigs(display->egl.dpy, NULL, 0, &count) || count < 1)
 154                 assert(0);
 155
 156         configs = calloc(count, sizeof *configs);
 157         assert(configs);
 158
 159         ret = eglChooseConfig(display->egl.dpy, config_attribs,
 160                               configs, count, &n);
 161         assert(ret && n >= 1);
 162
 163         for (i = 0; i < n; i++) {
 164                 eglGetConfigAttrib(display->egl.dpy,
 165                                    configs[i], EGL_BUFFER_SIZE, &size);
 166                 if (window->buffer_size == size) {
 167                         display->egl.conf = configs[i];
 168                         break;
 169                 }
 170         }
 171         free(configs);
 172         if (display->egl.conf == NULL) {
 173                 fprintf(stderr, "did not find config with buffer size %d\n",
 174                         window->buffer_size);
 175                 exit(EXIT_FAILURE);
 176         }
 177
 178         display->egl.ctx = eglCreateContext(display->egl.dpy,
 179                                             display->egl.conf,
 180                                             EGL_NO_CONTEXT, context_attribs);
 181         assert(display->egl.ctx);
 182
 183         display->swap_buffers_with_damage = NULL;
 184         extensions = eglQueryString(display->egl.dpy, EGL_EXTENSIONS);
 185         if (extensions &&
 186             strstr(extensions, "EGL_EXT_swap_buffers_with_damage") &&
 187             strstr(extensions, "EGL_EXT_buffer_age"))
 188                 display->swap_buffers_with_damage =
 189                         (PFNEGLSWAPBUFFERSWITHDAMAGEEXTPROC)
 190                         eglGetProcAddress("eglSwapBuffersWithDamageEXT");
 191
 192         if (display->swap_buffers_with_damage)
 193                 printf("has EGL_EXT_buffer_age and EGL_EXT_swap_buffers_with_damage\n");
 194
 195 }
 196
 197 static void
 198 fini_egl(struct display *display)
 199 {
 200         eglTerminate(display->egl.dpy);
 201         eglReleaseThread();
 202 }
 203
 204 static GLuint
 205 create_shader(struct window *window, const char *source, GLenum shader_type)
 206 {
 207         GLuint shader;
 208         GLint status;
 209
 210         shader = glCreateShader(shader_type);
 211         assert(shader != 0);
 212
 213         glShaderSource(shader, 1, (const char **) &source, NULL);
 214         glCompileShader(shader);
 215
 216         glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
 217         if (!status) {
 218                 char log[1000];
 219                 GLsizei len;
 220                 glGetShaderInfoLog(shader, 1000, &len, log);
 221                 fprintf(stderr, "Error: compiling %s: %*s\n",
 222                         shader_type == GL_VERTEX_SHADER ? "vertex" : "fragment",
 223                         len, log);
 224                 exit(1);
 225         }
 226
 227         return shader;
 228 }
 229
 230 static void
 231 init_gl(struct window *window)
 232 {
 233         GLuint frag, vert;
 234         GLuint program;
 235         GLint status;
 236
 237         frag = create_shader(window, frag_shader_text, GL_FRAGMENT_SHADER);
 238         vert = create_shader(window, vert_shader_text, GL_VERTEX_SHADER);
 239
 240         program = glCreateProgram();
 241         glAttachShader(program, frag);
 242         glAttachShader(program, vert);
 243         glLinkProgram(program);
 244
 245         glGetProgramiv(program, GL_LINK_STATUS, &status);
 246         if (!status) {
 247                 char log[1000];
 248                 GLsizei len;
 249                 glGetProgramInfoLog(program, 1000, &len, log);
 250                 fprintf(stderr, "Error: linking:\n%*s\n", len, log);
 251                 exit(1);
 252         }
 253
 254         glUseProgram(program);
 255
 256         window->gl.pos = 0;
 257         window->gl.col = 1;
 258
 259         glBindAttribLocation(program, window->gl.pos, "pos");
 260         glBindAttribLocation(program, window->gl.col, "color");
 261         glLinkProgram(program);
 262
 263         window->gl.rotation_uniform =
 264                 glGetUniformLocation(program, "rotation");
 265 }
 266
 267 static void
 268 handle_surface_configure(void *data, struct xdg_surface *surface,
 269                          int32_t width, int32_t height)
 270 {
 271         struct window *window = data;
 272
 273         if (window->native)
 274                 wl_egl_window_resize(window->native, width, height, 0, 0);
 275
 276         window->geometry.width = width;
 277         window->geometry.height = height;
 278
 279         if (!window->fullscreen)
 280                 window->window_size = window->geometry;
 281 }
 282
 283 static void
 284 handle_surface_request_set_maximized(void *data, struct xdg_surface *xdg_surface)
 285 {
 286 }
 287
 288 static void
 289 handle_surface_request_unset_maximized(void *data, struct xdg_surface *xdg_surface)
 290 {
 291 }
 292
 293 static void
 294 handle_surface_request_set_fullscreen(void *data, struct xdg_surface *xdg_surface)
 295 {
 296 }
 297
 298 static void
 299 handle_surface_request_unset_fullscreen(void *data, struct xdg_surface *xdg_surface)
 300 {
 301 }
 302
 303 static void
 304 handle_surface_focused_set(void *data, struct xdg_surface *xdg_surface)
 305 {
 306 }
 307
 308 static void
 309 handle_surface_focused_unset(void *data, struct xdg_surface *xdg_surface)
 310 {
 311 }
 312
 313 static const struct xdg_surface_listener xdg_surface_listener = {
 314         handle_surface_configure,
 315         handle_surface_request_set_maximized,
 316         handle_surface_request_unset_maximized,
 317         handle_surface_request_set_fullscreen,
 318         handle_surface_request_unset_fullscreen,
 319         handle_surface_focused_set,
 320         handle_surface_focused_unset,
 321 };
 322
 323 static void
 324 configure_callback(void *data, struct wl_callback *callback, uint32_t  time)
 325 {
 326         struct window *window = data;
 327
 328         wl_callback_destroy(callback);
 329
 330         window->configured = 1;
 331 }
 332
 333 static struct wl_callback_listener configure_callback_listener = {
 334         configure_callback,
 335 };
 336
 337 static void
 338 set_fullscreen(struct window *window, int fullscreen)
 339 {
 340         struct wl_callback *callback;
 341
 342         window->fullscreen = fullscreen;
 343         window->configured = 0;
 344
 345         if (fullscreen) {
 346                 xdg_surface_set_fullscreen(window->xdg_surface);
 347                 callback = wl_display_sync(window->display->display);
 348                 wl_callback_add_listener(callback,
 349                                          &configure_callback_listener,
 350                                          window);
 351
 352         } else {
 353                 xdg_surface_unset_fullscreen(window->xdg_surface);
 354                 handle_surface_configure(window, window->xdg_surface,
 355                                          window->window_size.width,
 356                                          window->window_size.height);
 357                 window->configured = 1;
 358         }
 359 }
 360
 361 static void
 362 create_surface(struct window *window)
 363 {
 364         struct display *display = window->display;
 365         EGLBoolean ret;
 366
 367         window->surface = wl_compositor_create_surface(display->compositor);
 368         window->xdg_surface = xdg_shell_get_xdg_surface(display->shell,
 369                                                         window->surface);
 370
 371         xdg_surface_add_listener(window->xdg_surface,
 372                                  &xdg_surface_listener, window);
 373
 374         window->native =
 375                 wl_egl_window_create(window->surface,
 376                                      window->window_size.width,
 377                                      window->window_size.height);
 378         window->egl_surface =
 379                 eglCreateWindowSurface(display->egl.dpy,
 380                                        display->egl.conf,
 381                                        window->native, NULL);
 382
 383         xdg_surface_set_title(window->xdg_surface, "simple-egl");
 384
 385         ret = eglMakeCurrent(window->display->egl.dpy, window->egl_surface,
 386                              window->egl_surface, window->display->egl.ctx);
 387         assert(ret == EGL_TRUE);
 388
 389         if (!window->frame_sync)
 390                 eglSwapInterval(display->egl.dpy, 0);
 391
 392         set_fullscreen(window, window->fullscreen);
 393 }
 394
 395 static void
 396 destroy_surface(struct window *window)
 397 {
 398         /* Required, otherwise segfault in egl_dri2.c: dri2_make_current()
 399          * on eglReleaseThread(). */
 400         eglMakeCurrent(window->display->egl.dpy, EGL_NO_SURFACE, EGL_NO_SURFACE,
 401                        EGL_NO_CONTEXT);
 402
 403         eglDestroySurface(window->display->egl.dpy, window->egl_surface);
 404         wl_egl_window_destroy(window->native);
 405
 406         xdg_surface_destroy(window->xdg_surface);
 407         wl_surface_destroy(window->surface);
 408
 409         if (window->callback)
 410                 wl_callback_destroy(window->callback);
 411 }
 412
 413 static const struct wl_callback_listener frame_listener;
 414
 415 static void
 416 redraw(void *data, struct wl_callback *callback, uint32_t time)
 417 {
 418         struct window *window = data;
 419         struct display *display = window->display;
 420         static const GLfloat verts[3][2] = {
 421                 { -0.5, -0.5 },
 422                 {  0.5, -0.5 },
 423                 {  0,    0.5 }
 424         };
 425         static const GLfloat colors[3][3] = {
 426                 { 1, 0, 0 },
 427                 { 0, 1, 0 },
 428                 { 0, 0, 1 }
 429         };
 430         GLfloat angle;
 431         GLfloat rotation[4][4] = {
 432                 { 1, 0, 0, 0 },
 433                 { 0, 1, 0, 0 },
 434                 { 0, 0, 1, 0 },
 435                 { 0, 0, 0, 1 }
 436         };
 437         static const uint32_t speed_div = 5, benchmark_interval = 5;
 438         struct wl_region *region;
 439         EGLint rect[4];
 440         EGLint buffer_age = 0;
 441         struct timeval tv;
 442
 443         assert(window->callback == callback);
 444         window->callback = NULL;
 445
 446         if (callback)
 447                 wl_callback_destroy(callback);
 448
 449         if (!window->configured)
 450                 return;
 451
 452         gettimeofday(&tv, NULL);
 453         time = tv.tv_sec * 1000 + tv.tv_usec / 1000;
 454         if (window->frames == 0)
 455                 window->benchmark_time = time;
 456         if (time - window->benchmark_time > (benchmark_interval * 1000)) {
 457                 printf("%d frames in %d seconds: %f fps\n",
 458                        window->frames,
 459                        benchmark_interval,
 460                        (float) window->frames / benchmark_interval);
 461                 window->benchmark_time = time;
 462                 window->frames = 0;
 463         }
 464
 465         angle = (time / speed_div) % 360 * M_PI / 180.0;
 466         rotation[0][0] =  cos(angle);
 467         rotation[0][2] =  sin(angle);
 468         rotation[2][0] = -sin(angle);
 469         rotation[2][2] =  cos(angle);
 470
 471         if (display->swap_buffers_with_damage)
 472                 eglQuerySurface(display->egl.dpy, window->egl_surface,
 473                                 EGL_BUFFER_AGE_EXT, &buffer_age);
 474
 475         glViewport(0, 0, window->geometry.width, window->geometry.height);
 476
 477         glUniformMatrix4fv(window->gl.rotation_uniform, 1, GL_FALSE,
 478                            (GLfloat *) rotation);
 479
 480         glClearColor(0.0, 0.0, 0.0, 0.5);
 481         glClear(GL_COLOR_BUFFER_BIT);
 482
 483         glVertexAttribPointer(window->gl.pos, 2, GL_FLOAT, GL_FALSE, 0, verts);
 484         glVertexAttribPointer(window->gl.col, 3, GL_FLOAT, GL_FALSE, 0, colors);
 485         glEnableVertexAttribArray(window->gl.pos);
 486         glEnableVertexAttribArray(window->gl.col);
 487
 488         glDrawArrays(GL_TRIANGLES, 0, 3);
 489
 490         glDisableVertexAttribArray(window->gl.pos);
 491         glDisableVertexAttribArray(window->gl.col);
 492
 493         if (window->opaque || window->fullscreen) {
 494                 region = wl_compositor_create_region(window->display->compositor);
 495                 wl_region_add(region, 0, 0,
 496                               window->geometry.width,
 497                               window->geometry.height);
 498                 wl_surface_set_opaque_region(window->surface, region);
 499                 wl_region_destroy(region);
 500         } else {
 501                 wl_surface_set_opaque_region(window->surface, NULL);
 502         }
 503
 504         if (display->swap_buffers_with_damage && buffer_age > 0) {
 505                 rect[0] = window->geometry.width / 4 - 1;
 506                 rect[1] = window->geometry.height / 4 - 1;
 507                 rect[2] = window->geometry.width / 2 + 2;
 508                 rect[3] = window->geometry.height / 2 + 2;
 509                 display->swap_buffers_with_damage(display->egl.dpy,
 510                                                   window->egl_surface,
 511                                                   rect, 1);
 512         } else {
 513                 eglSwapBuffers(display->egl.dpy, window->egl_surface);
 514         }
 515         window->frames++;
 516 }
 517
 518 static const struct wl_callback_listener frame_listener = {
 519         redraw
 520 };
 521
 522 static void
 523 pointer_handle_enter(void *data, struct wl_pointer *pointer,
 524                      uint32_t serial, struct wl_surface *surface,
 525                      wl_fixed_t sx, wl_fixed_t sy)
 526 {
 527         struct display *display = data;
 528         struct wl_buffer *buffer;
 529         struct wl_cursor *cursor = display->default_cursor;
 530         struct wl_cursor_image *image;
 531
 532         if (display->window->fullscreen)
 533                 wl_pointer_set_cursor(pointer, serial, NULL, 0, 0);
 534         else if (cursor) {
 535                 image = display->default_cursor->images[0];
 536                 buffer = wl_cursor_image_get_buffer(image);
 537                 wl_pointer_set_cursor(pointer, serial,
 538                                       display->cursor_surface,
 539                                       image->hotspot_x,
 540                                       image->hotspot_y);
 541                 wl_surface_attach(display->cursor_surface, buffer, 0, 0);
 542                 wl_surface_damage(display->cursor_surface, 0, 0,
 543                                   image->width, image->height);
 544                 wl_surface_commit(display->cursor_surface);
 545         }
 546 }
 547
 548 static void
 549 pointer_handle_leave(void *data, struct wl_pointer *pointer,
 550                      uint32_t serial, struct wl_surface *surface)
 551 {
 552 }
 553
 554 static void
 555 pointer_handle_motion(void *data, struct wl_pointer *pointer,
 556                       uint32_t time, wl_fixed_t sx, wl_fixed_t sy)
 557 {
 558 }
 559
 560 static void
 561 pointer_handle_button(void *data, struct wl_pointer *wl_pointer,
 562                       uint32_t serial, uint32_t time, uint32_t button,
 563                       uint32_t state)
 564 {
 565         struct display *display = data;
 566
 567         if (button == BTN_LEFT && state == WL_POINTER_BUTTON_STATE_PRESSED)
 568                 xdg_surface_move(display->window->xdg_surface,
 569                                  display->seat, serial);
 570 }
 571
 572 static void
 573 pointer_handle_axis(void *data, struct wl_pointer *wl_pointer,
 574                     uint32_t time, uint32_t axis, wl_fixed_t value)
 575 {
 576 }
 577
 578 static const struct wl_pointer_listener pointer_listener = {
 579         pointer_handle_enter,
 580         pointer_handle_leave,
 581         pointer_handle_motion,
 582         pointer_handle_button,
 583         pointer_handle_axis,
 584 };
 585
 586 static void
 587 touch_handle_down(void *data, struct wl_touch *wl_touch,
 588                   uint32_t serial, uint32_t time, struct wl_surface *surface,
 589                   int32_t id, wl_fixed_t x_w, wl_fixed_t y_w)
 590 {
 591         struct display *d = (struct display *)data;
 592
 593         xdg_surface_move(d->window->xdg_surface, d->seat, serial);
 594 }
 595
 596 static void
 597 touch_handle_up(void *data, struct wl_touch *wl_touch,
 598                 uint32_t serial, uint32_t time, int32_t id)
 599 {
 600 }
 601
 602 static void
 603 touch_handle_motion(void *data, struct wl_touch *wl_touch,
 604                     uint32_t time, int32_t id, wl_fixed_t x_w, wl_fixed_t y_w)
 605 {
 606 }
 607
 608 static void
 609 touch_handle_frame(void *data, struct wl_touch *wl_touch)
 610 {
 611 }
 612
 613 static void
 614 touch_handle_cancel(void *data, struct wl_touch *wl_touch)
 615 {
 616 }
 617
 618 static const struct wl_touch_listener touch_listener = {
 619         touch_handle_down,
 620         touch_handle_up,
 621         touch_handle_motion,
 622         touch_handle_frame,
 623         touch_handle_cancel,
 624 };
 625
 626 static void
 627 keyboard_handle_keymap(void *data, struct wl_keyboard *keyboard,
 628                        uint32_t format, int fd, uint32_t size)
 629 {
 630 }
 631
 632 static void
 633 keyboard_handle_enter(void *data, struct wl_keyboard *keyboard,
 634                       uint32_t serial, struct wl_surface *surface,
 635                       struct wl_array *keys)
 636 {
 637 }
 638
 639 static void
 640 keyboard_handle_leave(void *data, struct wl_keyboard *keyboard,
 641                       uint32_t serial, struct wl_surface *surface)
 642 {
 643 }
 644
 645 static void
 646 keyboard_handle_key(void *data, struct wl_keyboard *keyboard,
 647                     uint32_t serial, uint32_t time, uint32_t key,
 648                     uint32_t state)
 649 {
 650         struct display *d = data;
 651
 652         if (key == KEY_F11 && state)
 653                 set_fullscreen(d->window, d->window->fullscreen ^ 1);
 654         else if (key == KEY_ESC && state)
 655                 running = 0;
 656 }
 657
 658 static void
 659 keyboard_handle_modifiers(void *data, struct wl_keyboard *keyboard,
 660                           uint32_t serial, uint32_t mods_depressed,
 661                           uint32_t mods_latched, uint32_t mods_locked,
 662                           uint32_t group)
 663 {
 664 }
 665
 666 static const struct wl_keyboard_listener keyboard_listener = {
 667         keyboard_handle_keymap,
 668         keyboard_handle_enter,
 669         keyboard_handle_leave,
 670         keyboard_handle_key,
 671         keyboard_handle_modifiers,
 672 };
 673
 674 static void
 675 seat_handle_capabilities(void *data, struct wl_seat *seat,
 676                          enum wl_seat_capability caps)
 677 {
 678         struct display *d = data;
 679
 680         if ((caps & WL_SEAT_CAPABILITY_POINTER) && !d->pointer) {
 681                 d->pointer = wl_seat_get_pointer(seat);
 682                 wl_pointer_add_listener(d->pointer, &pointer_listener, d);
 683         } else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && d->pointer) {
 684                 wl_pointer_destroy(d->pointer);
 685                 d->pointer = NULL;
 686         }
 687
 688         if ((caps & WL_SEAT_CAPABILITY_KEYBOARD) && !d->keyboard) {
 689                 d->keyboard = wl_seat_get_keyboard(seat);
 690                 wl_keyboard_add_listener(d->keyboard, &keyboard_listener, d);
 691         } else if (!(caps & WL_SEAT_CAPABILITY_KEYBOARD) && d->keyboard) {
 692                 wl_keyboard_destroy(d->keyboard);
 693                 d->keyboard = NULL;
 694         }
 695
 696         if ((caps & WL_SEAT_CAPABILITY_TOUCH) && !d->touch) {
 697                 d->touch = wl_seat_get_touch(seat);
 698                 wl_touch_set_user_data(d->touch, d);
 699                 wl_touch_add_listener(d->touch, &touch_listener, d);
 700         } else if (!(caps & WL_SEAT_CAPABILITY_TOUCH) && d->touch) {
 701                 wl_touch_destroy(d->touch);
 702                 d->touch = NULL;
 703         }
 704 }
 705
 706 static const struct wl_seat_listener seat_listener = {
 707         seat_handle_capabilities,
 708 };
 709
 710 static void
 711 xdg_shell_ping(void *data, struct xdg_shell *shell, uint32_t serial)
 712 {
 713         xdg_shell_pong(shell, serial);
 714 }
 715
 716 static const struct xdg_shell_listener xdg_shell_listener = {
 717         xdg_shell_ping,
 718 };
 719
 720 #define XDG_VERSION 2 /* The version of xdg-shell that we implement */
 721 #ifdef static_assert
 722 static_assert(XDG_VERSION == XDG_SHELL_VERSION_CURRENT,
 723               "Interface version doesn't match implementation version");
 724 #endif
 725
 726 static void
 727 registry_handle_global(void *data, struct wl_registry *registry,
 728                        uint32_t name, const char *interface, uint32_t version)
 729 {
 730         struct display *d = data;
 731
 732         if (strcmp(interface, "wl_compositor") == 0) {
 733                 d->compositor =
 734                         wl_registry_bind(registry, name,
 735                                          &wl_compositor_interface, 1);
 736         } else if (strcmp(interface, "xdg_shell") == 0) {
 737                 d->shell = wl_registry_bind(registry, name,
 738                                             &xdg_shell_interface, 1);
 739                 xdg_shell_add_listener(d->shell, &xdg_shell_listener, d);
 740                 xdg_shell_use_unstable_version(d->shell, XDG_VERSION);
 741         } else if (strcmp(interface, "wl_seat") == 0) {
 742                 d->seat = wl_registry_bind(registry, name,
 743                                            &wl_seat_interface, 1);
 744                 wl_seat_add_listener(d->seat, &seat_listener, d);
 745         } else if (strcmp(interface, "wl_shm") == 0) {
 746                 d->shm = wl_registry_bind(registry, name,
 747                                           &wl_shm_interface, 1);
 748                 d->cursor_theme = wl_cursor_theme_load(NULL, 32, d->shm);
 749                 d->default_cursor =
 750                         wl_cursor_theme_get_cursor(d->cursor_theme, "left_ptr");
 751         }
 752 }
 753
 754 static void
 755 registry_handle_global_remove(void *data, struct wl_registry *registry,
 756                               uint32_t name)
 757 {
 758 }
 759
 760 static const struct wl_registry_listener registry_listener = {
 761         registry_handle_global,
 762         registry_handle_global_remove
 763 };
 764
 765 static void
 766 signal_int(int signum)
 767 {
 768         running = 0;
 769 }
 770
 771 static void
 772 usage(int error_code)
 773 {
 774         fprintf(stderr, "Usage: simple-egl [OPTIONS]\n\n"
 775                 "  -f\tRun in fullscreen mode\n"
 776                 "  -o\tCreate an opaque surface\n"
 777                 "  -s\tUse a 16 bpp EGL config\n"
 778                 "  -b\tDon't sync to compositor redraw (eglSwapInterval 0)\n"
 779                 "  -h\tThis help text\n\n");
 780
 781         exit(error_code);
 782 }
 783
 784 int
 785 main(int argc, char **argv)
 786 {
 787         struct sigaction sigint;
 788         struct display display = { 0 };
 789         struct window  window  = { 0 };
 790         int i, ret = 0;
 791
 792         window.display = &display;
 793         display.window = &window;
 794         window.window_size.width  = 250;
 795         window.window_size.height = 250;
 796         window.buffer_size = 32;
 797         window.frame_sync = 1;
 798
 799         for (i = 1; i < argc; i++) {
 800                 if (strcmp("-f", argv[i]) == 0)
 801                         window.fullscreen = 1;
 802                 else if (strcmp("-o", argv[i]) == 0)
 803                         window.opaque = 1;
 804                 else if (strcmp("-s", argv[i]) == 0)
 805                         window.buffer_size = 16;
 806                 else if (strcmp("-b", argv[i]) == 0)
 807                         window.frame_sync = 0;
 808                 else if (strcmp("-h", argv[i]) == 0)
 809                         usage(EXIT_SUCCESS);
 810                 else
 811                         usage(EXIT_FAILURE);
 812         }
 813
 814         display.display = wl_display_connect(NULL);
 815         assert(display.display);
 816
 817         display.registry = wl_display_get_registry(display.display);
 818         wl_registry_add_listener(display.registry,
 819                                  &registry_listener, &display);
 820
 821         wl_display_dispatch(display.display);
 822
 823         init_egl(&display, &window);
 824         create_surface(&window);
 825         init_gl(&window);
 826
 827         display.cursor_surface =
 828                 wl_compositor_create_surface(display.compositor);
 829
 830         sigint.sa_handler = signal_int;
 831         sigemptyset(&sigint.sa_mask);
 832         sigint.sa_flags = SA_RESETHAND;
 833         sigaction(SIGINT, &sigint, NULL);
 834
 835         /* The mainloop here is a little subtle.  Redrawing will cause
 836          * EGL to read events so we can just call
 837          * wl_display_dispatch_pending() to handle any events that got
 838          * queued up as a side effect. */
 839         while (running && ret != -1) {
 840                 wl_display_dispatch_pending(display.display);
 841                 while (!window.configured)
 842                         wl_display_dispatch(display.display);
 843                 redraw(&window, NULL, 0);
 844         }
 845
 846         fprintf(stderr, "simple-egl exiting\n");
 847
 848         destroy_surface(&window);
 849         fini_egl(&display);
 850
 851         wl_surface_destroy(display.cursor_surface);
 852         if (display.cursor_theme)
 853                 wl_cursor_theme_destroy(display.cursor_theme);
 854
 855         if (display.shell)
 856                 xdg_shell_destroy(display.shell);
 857
 858         if (display.compositor)
 859                 wl_compositor_destroy(display.compositor);
 860
 861         wl_registry_destroy(display.registry);
 862         wl_display_flush(display.display);
 863         wl_display_disconnect(display.display);
 864
 865         return 0;
 866 }