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 {
 273         struct window *window = data;
 274
 275         if (window->native)
 276                 wl_egl_window_resize(window->native, width, height, 0, 0);
 277
 278         window->geometry.width = width;
 279         window->geometry.height = height;
 280
 281         if (!window->fullscreen)
 282                 window->window_size = window->geometry;
 283 }
 284
 285 static void
 286 handle_surface_change_state(void *data, struct xdg_surface *xdg_surface,
 287                             uint32_t state,
 288                             uint32_t value,
 289                             uint32_t serial)
 290 {
 291         struct window *window = data;
 292
 293         switch (state) {
 294         case XDG_SURFACE_STATE_FULLSCREEN:
 295                 window->fullscreen = value;
 296
 297                 if (!value)
 298                         handle_surface_configure(window, window->xdg_surface,
 299                                                  window->window_size.width,
 300                                                  window->window_size.height);
 301                 break;
 302         }
 303
 304         xdg_surface_ack_change_state(xdg_surface, state, value, serial);
 305 }
 306
 307 static void
 308 handle_surface_activated(void *data, struct xdg_surface *xdg_surface)
 309 {
 310 }
 311
 312 static void
 313 handle_surface_deactivated(void *data, struct xdg_surface *xdg_surface)
 314 {
 315 }
 316
 317 static void
 318 handle_surface_delete(void *data, struct xdg_surface *xdg_surface)
 319 {
 320         running = 0;
 321 }
 322
 323 static const struct xdg_surface_listener xdg_surface_listener = {
 324         handle_surface_configure,
 325         handle_surface_change_state,
 326         handle_surface_activated,
 327         handle_surface_deactivated,
 328         handle_surface_delete,
 329 };
 330
 331 static void
 332 create_surface(struct window *window)
 333 {
 334         struct display *display = window->display;
 335         EGLBoolean ret;
 336
 337         window->surface = wl_compositor_create_surface(display->compositor);
 338         window->xdg_surface = xdg_shell_get_xdg_surface(display->shell,
 339                                                         window->surface);
 340
 341         xdg_surface_add_listener(window->xdg_surface,
 342                                  &xdg_surface_listener, window);
 343
 344         window->native =
 345                 wl_egl_window_create(window->surface,
 346                                      window->window_size.width,
 347                                      window->window_size.height);
 348         window->egl_surface =
 349                 eglCreateWindowSurface(display->egl.dpy,
 350                                        display->egl.conf,
 351                                        window->native, NULL);
 352
 353         xdg_surface_set_title(window->xdg_surface, "simple-egl");
 354
 355         ret = eglMakeCurrent(window->display->egl.dpy, window->egl_surface,
 356                              window->egl_surface, window->display->egl.ctx);
 357         assert(ret == EGL_TRUE);
 358
 359         if (!window->frame_sync)
 360                 eglSwapInterval(display->egl.dpy, 0);
 361
 362         xdg_surface_request_change_state(window->xdg_surface,
 363                                          XDG_SURFACE_STATE_FULLSCREEN,
 364                                          window->fullscreen, 0);
 365 }
 366
 367 static void
 368 destroy_surface(struct window *window)
 369 {
 370         /* Required, otherwise segfault in egl_dri2.c: dri2_make_current()
 371          * on eglReleaseThread(). */
 372         eglMakeCurrent(window->display->egl.dpy, EGL_NO_SURFACE, EGL_NO_SURFACE,
 373                        EGL_NO_CONTEXT);
 374
 375         eglDestroySurface(window->display->egl.dpy, window->egl_surface);
 376         wl_egl_window_destroy(window->native);
 377
 378         xdg_surface_destroy(window->xdg_surface);
 379         wl_surface_destroy(window->surface);
 380
 381         if (window->callback)
 382                 wl_callback_destroy(window->callback);
 383 }
 384
 385 static const struct wl_callback_listener frame_listener;
 386
 387 static void
 388 redraw(void *data, struct wl_callback *callback, uint32_t time)
 389 {
 390         struct window *window = data;
 391         struct display *display = window->display;
 392         static const GLfloat verts[3][2] = {
 393                 { -0.5, -0.5 },
 394                 {  0.5, -0.5 },
 395                 {  0,    0.5 }
 396         };
 397         static const GLfloat colors[3][3] = {
 398                 { 1, 0, 0 },
 399                 { 0, 1, 0 },
 400                 { 0, 0, 1 }
 401         };
 402         GLfloat angle;
 403         GLfloat rotation[4][4] = {
 404                 { 1, 0, 0, 0 },
 405                 { 0, 1, 0, 0 },
 406                 { 0, 0, 1, 0 },
 407                 { 0, 0, 0, 1 }
 408         };
 409         static const uint32_t speed_div = 5, benchmark_interval = 5;
 410         struct wl_region *region;
 411         EGLint rect[4];
 412         EGLint buffer_age = 0;
 413         struct timeval tv;
 414
 415         assert(window->callback == callback);
 416         window->callback = NULL;
 417
 418         if (callback)
 419                 wl_callback_destroy(callback);
 420
 421         gettimeofday(&tv, NULL);
 422         time = tv.tv_sec * 1000 + tv.tv_usec / 1000;
 423         if (window->frames == 0)
 424                 window->benchmark_time = time;
 425         if (time - window->benchmark_time > (benchmark_interval * 1000)) {
 426                 printf("%d frames in %d seconds: %f fps\n",
 427                        window->frames,
 428                        benchmark_interval,
 429                        (float) window->frames / benchmark_interval);
 430                 window->benchmark_time = time;
 431                 window->frames = 0;
 432         }
 433
 434         angle = (time / speed_div) % 360 * M_PI / 180.0;
 435         rotation[0][0] =  cos(angle);
 436         rotation[0][2] =  sin(angle);
 437         rotation[2][0] = -sin(angle);
 438         rotation[2][2] =  cos(angle);
 439
 440         if (display->swap_buffers_with_damage)
 441                 eglQuerySurface(display->egl.dpy, window->egl_surface,
 442                                 EGL_BUFFER_AGE_EXT, &buffer_age);
 443
 444         glViewport(0, 0, window->geometry.width, window->geometry.height);
 445
 446         glUniformMatrix4fv(window->gl.rotation_uniform, 1, GL_FALSE,
 447                            (GLfloat *) rotation);
 448
 449         glClearColor(0.0, 0.0, 0.0, 0.5);
 450         glClear(GL_COLOR_BUFFER_BIT);
 451
 452         glVertexAttribPointer(window->gl.pos, 2, GL_FLOAT, GL_FALSE, 0, verts);
 453         glVertexAttribPointer(window->gl.col, 3, GL_FLOAT, GL_FALSE, 0, colors);
 454         glEnableVertexAttribArray(window->gl.pos);
 455         glEnableVertexAttribArray(window->gl.col);
 456
 457         glDrawArrays(GL_TRIANGLES, 0, 3);
 458
 459         glDisableVertexAttribArray(window->gl.pos);
 460         glDisableVertexAttribArray(window->gl.col);
 461
 462         if (window->opaque || window->fullscreen) {
 463                 region = wl_compositor_create_region(window->display->compositor);
 464                 wl_region_add(region, 0, 0,
 465                               window->geometry.width,
 466                               window->geometry.height);
 467                 wl_surface_set_opaque_region(window->surface, region);
 468                 wl_region_destroy(region);
 469         } else {
 470                 wl_surface_set_opaque_region(window->surface, NULL);
 471         }
 472
 473         if (display->swap_buffers_with_damage && buffer_age > 0) {
 474                 rect[0] = window->geometry.width / 4 - 1;
 475                 rect[1] = window->geometry.height / 4 - 1;
 476                 rect[2] = window->geometry.width / 2 + 2;
 477                 rect[3] = window->geometry.height / 2 + 2;
 478                 display->swap_buffers_with_damage(display->egl.dpy,
 479                                                   window->egl_surface,
 480                                                   rect, 1);
 481         } else {
 482                 eglSwapBuffers(display->egl.dpy, window->egl_surface);
 483         }
 484         window->frames++;
 485 }
 486
 487 static const struct wl_callback_listener frame_listener = {
 488         redraw
 489 };
 490
 491 static void
 492 pointer_handle_enter(void *data, struct wl_pointer *pointer,
 493                      uint32_t serial, struct wl_surface *surface,
 494                      wl_fixed_t sx, wl_fixed_t sy)
 495 {
 496         struct display *display = data;
 497         struct wl_buffer *buffer;
 498         struct wl_cursor *cursor = display->default_cursor;
 499         struct wl_cursor_image *image;
 500
 501         if (display->window->fullscreen)
 502                 wl_pointer_set_cursor(pointer, serial, NULL, 0, 0);
 503         else if (cursor) {
 504                 image = display->default_cursor->images[0];
 505                 buffer = wl_cursor_image_get_buffer(image);
 506                 if (!buffer)
 507                         return;
 508                 wl_pointer_set_cursor(pointer, serial,
 509                                       display->cursor_surface,
 510                                       image->hotspot_x,
 511                                       image->hotspot_y);
 512                 wl_surface_attach(display->cursor_surface, buffer, 0, 0);
 513                 wl_surface_damage(display->cursor_surface, 0, 0,
 514                                   image->width, image->height);
 515                 wl_surface_commit(display->cursor_surface);
 516         }
 517 }
 518
 519 static void
 520 pointer_handle_leave(void *data, struct wl_pointer *pointer,
 521                      uint32_t serial, struct wl_surface *surface)
 522 {
 523 }
 524
 525 static void
 526 pointer_handle_motion(void *data, struct wl_pointer *pointer,
 527                       uint32_t time, wl_fixed_t sx, wl_fixed_t sy)
 528 {
 529 }
 530
 531 static void
 532 pointer_handle_button(void *data, struct wl_pointer *wl_pointer,
 533                       uint32_t serial, uint32_t time, uint32_t button,
 534                       uint32_t state)
 535 {
 536         struct display *display = data;
 537
 538         if (button == BTN_LEFT && state == WL_POINTER_BUTTON_STATE_PRESSED)
 539                 xdg_surface_move(display->window->xdg_surface,
 540                                  display->seat, serial);
 541 }
 542
 543 static void
 544 pointer_handle_axis(void *data, struct wl_pointer *wl_pointer,
 545                     uint32_t time, uint32_t axis, wl_fixed_t value)
 546 {
 547 }
 548
 549 static const struct wl_pointer_listener pointer_listener = {
 550         pointer_handle_enter,
 551         pointer_handle_leave,
 552         pointer_handle_motion,
 553         pointer_handle_button,
 554         pointer_handle_axis,
 555 };
 556
 557 static void
 558 touch_handle_down(void *data, struct wl_touch *wl_touch,
 559                   uint32_t serial, uint32_t time, struct wl_surface *surface,
 560                   int32_t id, wl_fixed_t x_w, wl_fixed_t y_w)
 561 {
 562         struct display *d = (struct display *)data;
 563
 564         xdg_surface_move(d->window->xdg_surface, d->seat, serial);
 565 }
 566
 567 static void
 568 touch_handle_up(void *data, struct wl_touch *wl_touch,
 569                 uint32_t serial, uint32_t time, int32_t id)
 570 {
 571 }
 572
 573 static void
 574 touch_handle_motion(void *data, struct wl_touch *wl_touch,
 575                     uint32_t time, int32_t id, wl_fixed_t x_w, wl_fixed_t y_w)
 576 {
 577 }
 578
 579 static void
 580 touch_handle_frame(void *data, struct wl_touch *wl_touch)
 581 {
 582 }
 583
 584 static void
 585 touch_handle_cancel(void *data, struct wl_touch *wl_touch)
 586 {
 587 }
 588
 589 static const struct wl_touch_listener touch_listener = {
 590         touch_handle_down,
 591         touch_handle_up,
 592         touch_handle_motion,
 593         touch_handle_frame,
 594         touch_handle_cancel,
 595 };
 596
 597 static void
 598 keyboard_handle_keymap(void *data, struct wl_keyboard *keyboard,
 599                        uint32_t format, int fd, uint32_t size)
 600 {
 601 }
 602
 603 static void
 604 keyboard_handle_enter(void *data, struct wl_keyboard *keyboard,
 605                       uint32_t serial, struct wl_surface *surface,
 606                       struct wl_array *keys)
 607 {
 608 }
 609
 610 static void
 611 keyboard_handle_leave(void *data, struct wl_keyboard *keyboard,
 612                       uint32_t serial, struct wl_surface *surface)
 613 {
 614 }
 615
 616 static void
 617 keyboard_handle_key(void *data, struct wl_keyboard *keyboard,
 618                     uint32_t serial, uint32_t time, uint32_t key,
 619                     uint32_t state)
 620 {
 621         struct display *d = data;
 622
 623         if (key == KEY_F11 && state)
 624                 xdg_surface_request_change_state(d->window->xdg_surface,
 625                                                  XDG_SURFACE_STATE_FULLSCREEN,
 626                                                  !d->window->fullscreen, 0);
 627         else if (key == KEY_ESC && state)
 628                 running = 0;
 629 }
 630
 631 static void
 632 keyboard_handle_modifiers(void *data, struct wl_keyboard *keyboard,
 633                           uint32_t serial, uint32_t mods_depressed,
 634                           uint32_t mods_latched, uint32_t mods_locked,
 635                           uint32_t group)
 636 {
 637 }
 638
 639 static const struct wl_keyboard_listener keyboard_listener = {
 640         keyboard_handle_keymap,
 641         keyboard_handle_enter,
 642         keyboard_handle_leave,
 643         keyboard_handle_key,
 644         keyboard_handle_modifiers,
 645 };
 646
 647 static void
 648 seat_handle_capabilities(void *data, struct wl_seat *seat,
 649                          enum wl_seat_capability caps)
 650 {
 651         struct display *d = data;
 652
 653         if ((caps & WL_SEAT_CAPABILITY_POINTER) && !d->pointer) {
 654                 d->pointer = wl_seat_get_pointer(seat);
 655                 wl_pointer_add_listener(d->pointer, &pointer_listener, d);
 656         } else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && d->pointer) {
 657                 wl_pointer_destroy(d->pointer);
 658                 d->pointer = NULL;
 659         }
 660
 661         if ((caps & WL_SEAT_CAPABILITY_KEYBOARD) && !d->keyboard) {
 662                 d->keyboard = wl_seat_get_keyboard(seat);
 663                 wl_keyboard_add_listener(d->keyboard, &keyboard_listener, d);
 664         } else if (!(caps & WL_SEAT_CAPABILITY_KEYBOARD) && d->keyboard) {
 665                 wl_keyboard_destroy(d->keyboard);
 666                 d->keyboard = NULL;
 667         }
 668
 669         if ((caps & WL_SEAT_CAPABILITY_TOUCH) && !d->touch) {
 670                 d->touch = wl_seat_get_touch(seat);
 671                 wl_touch_set_user_data(d->touch, d);
 672                 wl_touch_add_listener(d->touch, &touch_listener, d);
 673         } else if (!(caps & WL_SEAT_CAPABILITY_TOUCH) && d->touch) {
 674                 wl_touch_destroy(d->touch);
 675                 d->touch = NULL;
 676         }
 677 }
 678
 679 static const struct wl_seat_listener seat_listener = {
 680         seat_handle_capabilities,
 681 };
 682
 683 static void
 684 xdg_shell_ping(void *data, struct xdg_shell *shell, uint32_t serial)
 685 {
 686         xdg_shell_pong(shell, serial);
 687 }
 688
 689 static const struct xdg_shell_listener xdg_shell_listener = {
 690         xdg_shell_ping,
 691 };
 692
 693 #define XDG_VERSION 3 /* The version of xdg-shell that we implement */
 694 #ifdef static_assert
 695 static_assert(XDG_VERSION == XDG_SHELL_VERSION_CURRENT,
 696               "Interface version doesn't match implementation version");
 697 #endif
 698
 699 static void
 700 registry_handle_global(void *data, struct wl_registry *registry,
 701                        uint32_t name, const char *interface, uint32_t version)
 702 {
 703         struct display *d = data;
 704
 705         if (strcmp(interface, "wl_compositor") == 0) {
 706                 d->compositor =
 707                         wl_registry_bind(registry, name,
 708                                          &wl_compositor_interface, 1);
 709         } else if (strcmp(interface, "xdg_shell") == 0) {
 710                 d->shell = wl_registry_bind(registry, name,
 711                                             &xdg_shell_interface, 1);
 712                 xdg_shell_add_listener(d->shell, &xdg_shell_listener, d);
 713                 xdg_shell_use_unstable_version(d->shell, XDG_VERSION);
 714         } else if (strcmp(interface, "wl_seat") == 0) {
 715                 d->seat = wl_registry_bind(registry, name,
 716                                            &wl_seat_interface, 1);
 717                 wl_seat_add_listener(d->seat, &seat_listener, d);
 718         } else if (strcmp(interface, "wl_shm") == 0) {
 719                 d->shm = wl_registry_bind(registry, name,
 720                                           &wl_shm_interface, 1);
 721                 d->cursor_theme = wl_cursor_theme_load(NULL, 32, d->shm);
 722                 if (!d->cursor_theme) {
 723                         fprintf(stderr, "unable to load default theme\n");
 724                         return;
 725                 }
 726                 d->default_cursor =
 727                         wl_cursor_theme_get_cursor(d->cursor_theme, "left_ptr");
 728                 if (!d->default_cursor) {
 729                         fprintf(stderr, "unable to load default left pointer\n");
 730                         // TODO: abort ?
 731                 }
 732         }
 733 }
 734
 735 static void
 736 registry_handle_global_remove(void *data, struct wl_registry *registry,
 737                               uint32_t name)
 738 {
 739 }
 740
 741 static const struct wl_registry_listener registry_listener = {
 742         registry_handle_global,
 743         registry_handle_global_remove
 744 };
 745
 746 static void
 747 signal_int(int signum)
 748 {
 749         running = 0;
 750 }
 751
 752 static void
 753 usage(int error_code)
 754 {
 755         fprintf(stderr, "Usage: simple-egl [OPTIONS]\n\n"
 756                 "  -f\tRun in fullscreen mode\n"
 757                 "  -o\tCreate an opaque surface\n"
 758                 "  -s\tUse a 16 bpp EGL config\n"
 759                 "  -b\tDon't sync to compositor redraw (eglSwapInterval 0)\n"
 760                 "  -h\tThis help text\n\n");
 761
 762         exit(error_code);
 763 }
 764
 765 int
 766 main(int argc, char **argv)
 767 {
 768         struct sigaction sigint;
 769         struct display display = { 0 };
 770         struct window  window  = { 0 };
 771         int i, ret = 0;
 772
 773         window.display = &display;
 774         display.window = &window;
 775         window.window_size.width  = 250;
 776         window.window_size.height = 250;
 777         window.buffer_size = 32;
 778         window.frame_sync = 1;
 779
 780         for (i = 1; i < argc; i++) {
 781                 if (strcmp("-f", argv[i]) == 0)
 782                         window.fullscreen = 1;
 783                 else if (strcmp("-o", argv[i]) == 0)
 784                         window.opaque = 1;
 785                 else if (strcmp("-s", argv[i]) == 0)
 786                         window.buffer_size = 16;
 787                 else if (strcmp("-b", argv[i]) == 0)
 788                         window.frame_sync = 0;
 789                 else if (strcmp("-h", argv[i]) == 0)
 790                         usage(EXIT_SUCCESS);
 791                 else
 792                         usage(EXIT_FAILURE);
 793         }
 794
 795         display.display = wl_display_connect(NULL);
 796         assert(display.display);
 797
 798         display.registry = wl_display_get_registry(display.display);
 799         wl_registry_add_listener(display.registry,
 800                                  &registry_listener, &display);
 801
 802         wl_display_dispatch(display.display);
 803
 804         init_egl(&display, &window);
 805         create_surface(&window);
 806         init_gl(&window);
 807
 808         display.cursor_surface =
 809                 wl_compositor_create_surface(display.compositor);
 810
 811         sigint.sa_handler = signal_int;
 812         sigemptyset(&sigint.sa_mask);
 813         sigint.sa_flags = SA_RESETHAND;
 814         sigaction(SIGINT, &sigint, NULL);
 815
 816         /* The mainloop here is a little subtle.  Redrawing will cause
 817          * EGL to read events so we can just call
 818          * wl_display_dispatch_pending() to handle any events that got
 819          * queued up as a side effect. */
 820         while (running && ret != -1) {
 821                 wl_display_dispatch_pending(display.display);
 822                 redraw(&window, NULL, 0);
 823         }
 824
 825         fprintf(stderr, "simple-egl exiting\n");
 826
 827         destroy_surface(&window);
 828         fini_egl(&display);
 829
 830         wl_surface_destroy(display.cursor_surface);
 831         if (display.cursor_theme)
 832                 wl_cursor_theme_destroy(display.cursor_theme);
 833
 834         if (display.shell)
 835                 xdg_shell_destroy(display.shell);
 836
 837         if (display.compositor)
 838                 wl_compositor_destroy(display.compositor);
 839
 840         wl_registry_destroy(display.registry);
 841         wl_display_flush(display.display);
 842         wl_display_disconnect(display.display);
 843
 844         return 0;
 845 }