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 <wayland-client.h>
  32 #include <wayland-egl.h>
  33
  34 #include <GLES2/gl2.h>
  35 #include <EGL/egl.h>
  36
  37 struct window;
  38 struct seat;
  39
  40 struct display {
  41         struct wl_display *display;
  42         struct wl_compositor *compositor;
  43         struct wl_shell *shell;
  44         struct wl_seat *seat;
  45         struct wl_pointer *pointer;
  46         struct {
  47                 EGLDisplay dpy;
  48                 EGLContext ctx;
  49                 EGLConfig conf;
  50         } egl;
  51         uint32_t mask;
  52         struct window *window;
  53 };
  54
  55 struct window {
  56         struct display *display;
  57         struct {
  58                 int width, height;
  59         } geometry;
  60         struct {
  61                 GLuint fbo;
  62                 GLuint color_rbo;
  63
  64                 GLuint program;
  65                 GLuint rotation_uniform;
  66
  67                 GLuint pos;
  68                 GLuint col;
  69         } gl;
  70
  71         struct wl_egl_window *native;
  72         struct wl_surface *surface;
  73         struct wl_shell_surface *shell_surface;
  74         EGLSurface egl_surface;
  75         struct wl_callback *callback;
  76         int fullscreen, configured;
  77 };
  78
  79 static const char *vert_shader_text =
  80         "uniform mat4 rotation;\n"
  81         "attribute vec4 pos;\n"
  82         "attribute vec4 color;\n"
  83         "varying vec4 v_color;\n"
  84         "void main() {\n"
  85         "  gl_Position = rotation * pos;\n"
  86         "  v_color = color;\n"
  87         "}\n";
  88
  89 static const char *frag_shader_text =
  90         "precision mediump float;\n"
  91         "varying vec4 v_color;\n"
  92         "void main() {\n"
  93         "  gl_FragColor = v_color;\n"
  94         "}\n";
  95
  96 static void
  97 init_egl(struct display *display, EGLint alpha_size)
  98 {
  99         static const EGLint context_attribs[] = {
 100                 EGL_CONTEXT_CLIENT_VERSION, 2,
 101                 EGL_NONE
 102         };
 103
 104         EGLint config_attribs[] = {
 105                 EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 106                 EGL_RED_SIZE, 1,
 107                 EGL_GREEN_SIZE, 1,
 108                 EGL_BLUE_SIZE, 1,
 109                 EGL_ALPHA_SIZE, alpha_size,
 110                 EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
 111                 EGL_NONE
 112         };
 113
 114         EGLint major, minor, n;
 115         EGLBoolean ret;
 116
 117         display->egl.dpy = eglGetDisplay(display->display);
 118         assert(display->egl.dpy);
 119
 120         ret = eglInitialize(display->egl.dpy, &major, &minor);
 121         assert(ret == EGL_TRUE);
 122         ret = eglBindAPI(EGL_OPENGL_ES_API);
 123         assert(ret == EGL_TRUE);
 124
 125         ret = eglChooseConfig(display->egl.dpy, config_attribs,
 126                               &display->egl.conf, 1, &n);
 127         assert(ret && n == 1);
 128
 129         display->egl.ctx = eglCreateContext(display->egl.dpy,
 130                                             display->egl.conf,
 131                                             EGL_NO_CONTEXT, context_attribs);
 132         assert(display->egl.ctx);
 133
 134 }
 135
 136 static void
 137 fini_egl(struct display *display)
 138 {
 139         /* Required, otherwise segfault in egl_dri2.c: dri2_make_current()
 140          * on eglReleaseThread(). */
 141         eglMakeCurrent(display->egl.dpy, EGL_NO_SURFACE, EGL_NO_SURFACE,
 142                        EGL_NO_CONTEXT);
 143
 144         eglTerminate(display->egl.dpy);
 145         eglReleaseThread();
 146 }
 147
 148 static GLuint
 149 create_shader(struct window *window, const char *source, GLenum shader_type)
 150 {
 151         GLuint shader;
 152         GLint status;
 153
 154         shader = glCreateShader(shader_type);
 155         assert(shader != 0);
 156
 157         glShaderSource(shader, 1, (const char **) &source, NULL);
 158         glCompileShader(shader);
 159
 160         glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
 161         if (!status) {
 162                 char log[1000];
 163                 GLsizei len;
 164                 glGetShaderInfoLog(shader, 1000, &len, log);
 165                 fprintf(stderr, "Error: compiling %s: %*s\n",
 166                         shader_type == GL_VERTEX_SHADER ? "vertex" : "fragment",
 167                         len, log);
 168                 exit(1);
 169         }
 170
 171         return shader;
 172 }
 173
 174 static void
 175 init_gl(struct window *window)
 176 {
 177         GLuint frag, vert;
 178         GLint status;
 179
 180         glViewport(0, 0, window->geometry.width, window->geometry.height);
 181
 182         frag = create_shader(window, frag_shader_text, GL_FRAGMENT_SHADER);
 183         vert = create_shader(window, vert_shader_text, GL_VERTEX_SHADER);
 184
 185         window->gl.program = glCreateProgram();
 186         glAttachShader(window->gl.program, frag);
 187         glAttachShader(window->gl.program, vert);
 188         glLinkProgram(window->gl.program);
 189
 190         glGetProgramiv(window->gl.program, GL_LINK_STATUS, &status);
 191         if (!status) {
 192                 char log[1000];
 193                 GLsizei len;
 194                 glGetProgramInfoLog(window->gl.program, 1000, &len, log);
 195                 fprintf(stderr, "Error: linking:\n%*s\n", len, log);
 196                 exit(1);
 197         }
 198
 199         glUseProgram(window->gl.program);
 200
 201         window->gl.pos = 0;
 202         window->gl.pos = 1;
 203
 204         glBindAttribLocation(window->gl.program, window->gl.pos, "pos");
 205         glBindAttribLocation(window->gl.program, window->gl.col, "color");
 206         glLinkProgram(window->gl.program);
 207
 208         window->gl.rotation_uniform =
 209                 glGetUniformLocation(window->gl.program, "rotation");
 210 }
 211
 212 static void
 213 handle_ping(void *data, struct wl_shell_surface *shell_surface,
 214             uint32_t serial)
 215 {
 216         wl_shell_surface_pong(shell_surface, serial);
 217 }
 218
 219 static void
 220 handle_configure(void *data, struct wl_shell_surface *shell_surface,
 221                  uint32_t edges, int32_t width, int32_t height)
 222 {
 223         struct window *window = data;
 224
 225         window->geometry.width = width;
 226         window->geometry.height = height;
 227         window->configured = 1;
 228 }
 229
 230 static void
 231 handle_popup_done(void *data, struct wl_shell_surface *shell_surface)
 232 {
 233 }
 234
 235 static const struct wl_shell_surface_listener shell_surface_listener = {
 236         handle_ping,
 237         handle_configure,
 238         handle_popup_done
 239 };
 240
 241 static void
 242 create_surface(struct window *window)
 243 {
 244         struct display *display = window->display;
 245         EGLBoolean ret;
 246
 247         window->surface = wl_compositor_create_surface(display->compositor);
 248         window->shell_surface = wl_shell_get_shell_surface(display->shell,
 249                                                            window->surface);
 250
 251         wl_shell_surface_add_listener(window->shell_surface,
 252                                       &shell_surface_listener, window);
 253
 254         if (window->fullscreen) {
 255                 window->configured = 0;
 256                 wl_shell_surface_set_fullscreen(window->shell_surface,
 257                                                 WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT,
 258                                                 0, NULL);
 259
 260                 while (!window->configured)
 261                         wl_display_iterate(display->display, display->mask);
 262         }
 263         else
 264                 wl_shell_surface_set_toplevel(window->shell_surface);
 265
 266         window->native =
 267                 wl_egl_window_create(window->surface,
 268                                      window->geometry.width,
 269                                      window->geometry.height);
 270         window->egl_surface =
 271                 eglCreateWindowSurface(display->egl.dpy,
 272                                        display->egl.conf,
 273                                        window->native, NULL);
 274
 275         ret = eglMakeCurrent(window->display->egl.dpy, window->egl_surface,
 276                              window->egl_surface, window->display->egl.ctx);
 277         assert(ret == EGL_TRUE);
 278 }
 279
 280 static void
 281 destroy_surface(struct window *window)
 282 {
 283         wl_egl_window_destroy(window->native);
 284
 285         wl_shell_surface_destroy(window->shell_surface);
 286         wl_surface_destroy(window->surface);
 287
 288         if (window->callback)
 289                 wl_callback_destroy(window->callback);
 290 }
 291
 292 static const struct wl_callback_listener frame_listener;
 293
 294 static void
 295 redraw(void *data, struct wl_callback *callback, uint32_t time)
 296 {
 297         struct window *window = data;
 298         static const GLfloat verts[3][2] = {
 299                 { -0.5, -0.5 },
 300                 {  0.5, -0.5 },
 301                 {  0,    0.5 }
 302         };
 303         static const GLfloat colors[3][3] = {
 304                 { 1, 0, 0 },
 305                 { 0, 1, 0 },
 306                 { 0, 0, 1 }
 307         };
 308         GLfloat angle;
 309         GLfloat rotation[4][4] = {
 310                 { 1, 0, 0, 0 },
 311                 { 0, 1, 0, 0 },
 312                 { 0, 0, 1, 0 },
 313                 { 0, 0, 0, 1 }
 314         };
 315         static const int32_t speed_div = 5;
 316         static uint32_t start_time = 0;
 317
 318         if (start_time == 0)
 319                 start_time = time;
 320
 321         angle = ((time-start_time) / speed_div) % 360 * M_PI / 180.0;
 322         rotation[0][0] =  cos(angle);
 323         rotation[0][2] =  sin(angle);
 324         rotation[2][0] = -sin(angle);
 325         rotation[2][2] =  cos(angle);
 326
 327         glUniformMatrix4fv(window->gl.rotation_uniform, 1, GL_FALSE,
 328                            (GLfloat *) rotation);
 329
 330         glClearColor(0.0, 0.0, 0.0, 0.5);
 331         glClear(GL_COLOR_BUFFER_BIT);
 332
 333         glVertexAttribPointer(window->gl.pos, 2, GL_FLOAT, GL_FALSE, 0, verts);
 334         glVertexAttribPointer(window->gl.col, 3, GL_FLOAT, GL_FALSE, 0, colors);
 335         glEnableVertexAttribArray(window->gl.pos);
 336         glEnableVertexAttribArray(window->gl.col);
 337
 338         glDrawArrays(GL_TRIANGLES, 0, 3);
 339
 340         glDisableVertexAttribArray(window->gl.pos);
 341         glDisableVertexAttribArray(window->gl.col);
 342
 343         glFlush();
 344
 345         eglSwapBuffers(window->display->egl.dpy, window->egl_surface);
 346         if (callback)
 347                 wl_callback_destroy(callback);
 348
 349         window->callback = wl_surface_frame(window->surface);
 350         wl_callback_add_listener(window->callback, &frame_listener, window);
 351 }
 352
 353 static const struct wl_callback_listener frame_listener = {
 354         redraw
 355 };
 356
 357 static void
 358 pointer_handle_enter(void *data, struct wl_pointer *pointer,
 359                      uint32_t serial, struct wl_surface *surface,
 360                      wl_fixed_t sx, wl_fixed_t sy)
 361 {
 362         struct display *display = data;
 363
 364         if (display->window->fullscreen)
 365                 wl_pointer_attach(pointer, serial, NULL, 0, 0);
 366 }
 367
 368 static void
 369 pointer_handle_leave(void *data, struct wl_pointer *pointer,
 370                      uint32_t serial, struct wl_surface *surface)
 371 {
 372 }
 373
 374 static void
 375 pointer_handle_motion(void *data, struct wl_pointer *pointer,
 376                       uint32_t time, wl_fixed_t sx, wl_fixed_t sy)
 377 {
 378 }
 379
 380 static void
 381 pointer_handle_button(void *data, struct wl_pointer *wl_pointer,
 382                       uint32_t serial, uint32_t time, uint32_t button,
 383                       uint32_t state)
 384 {
 385 }
 386
 387 static void
 388 pointer_handle_axis(void *data, struct wl_pointer *wl_pointer,
 389                     uint32_t time, uint32_t axis, wl_fixed_t value)
 390 {
 391 }
 392
 393 static const struct wl_pointer_listener pointer_listener = {
 394         pointer_handle_enter,
 395         pointer_handle_leave,
 396         pointer_handle_motion,
 397         pointer_handle_button,
 398         pointer_handle_axis,
 399 };
 400
 401 static void
 402 seat_handle_capabilities(void *data, struct wl_seat *seat,
 403                          enum wl_seat_capability caps)
 404 {
 405         struct display *d = data;
 406
 407         if ((caps & WL_SEAT_CAPABILITY_POINTER) && !d->pointer) {
 408                 d->pointer = wl_seat_get_pointer(seat);
 409                 wl_pointer_add_listener(d->pointer, &pointer_listener, d);
 410         } else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && d->pointer) {
 411                 wl_pointer_destroy(d->pointer);
 412                 d->pointer = NULL;
 413         }
 414 }
 415
 416 static const struct wl_seat_listener seat_listener = {
 417         seat_handle_capabilities,
 418 };
 419
 420 static void
 421 display_handle_global(struct wl_display *display, uint32_t id,
 422                       const char *interface, uint32_t version, void *data)
 423 {
 424         struct display *d = data;
 425
 426         if (strcmp(interface, "wl_compositor") == 0) {
 427                 d->compositor =
 428                         wl_display_bind(display, id, &wl_compositor_interface);
 429         } else if (strcmp(interface, "wl_shell") == 0) {
 430                 d->shell = wl_display_bind(display, id, &wl_shell_interface);
 431         } else if (strcmp(interface, "wl_seat") == 0) {
 432                 d->seat = wl_display_bind(d->display, id, &wl_seat_interface);
 433                 wl_seat_add_listener(d->seat, &seat_listener, d);
 434         }
 435 }
 436
 437 static int
 438 event_mask_update(uint32_t mask, void *data)
 439 {
 440         struct display *d = data;
 441
 442         d->mask = mask;
 443
 444         return 0;
 445 }
 446
 447 static int running = 1;
 448
 449 static void
 450 signal_int(int signum)
 451 {
 452         running = 0;
 453 }
 454
 455 int
 456 main(int argc, char **argv)
 457 {
 458         struct sigaction sigint;
 459         struct display display = { 0 };
 460         struct window  window  = { 0 };
 461         int alpha_size, i;
 462
 463         window.display = &display;
 464         display.window = &window;
 465         window.geometry.width  = 250;
 466         window.geometry.height = 250;
 467
 468         alpha_size = 1;
 469         for (i = 1; i < argc; i++) {
 470                 if (strcmp("-f", argv[i]) == 0)
 471                         window.fullscreen = 1;
 472                 if (strcmp("-o", argv[i]) == 0)
 473                         alpha_size = 0;
 474         }
 475
 476         display.display = wl_display_connect(NULL);
 477         assert(display.display);
 478
 479         wl_display_add_global_listener(display.display,
 480                                        display_handle_global, &display);
 481
 482         wl_display_get_fd(display.display, event_mask_update, &display);
 483         wl_display_iterate(display.display, WL_DISPLAY_READABLE);
 484
 485         if (window.fullscreen)
 486                 alpha_size = 0;
 487
 488         init_egl(&display, alpha_size);
 489         create_surface(&window);
 490         init_gl(&window);
 491
 492         sigint.sa_handler = signal_int;
 493         sigemptyset(&sigint.sa_mask);
 494         sigint.sa_flags = SA_RESETHAND;
 495         sigaction(SIGINT, &sigint, NULL);
 496
 497         redraw(&window, NULL, 0);
 498
 499         while (running)
 500                 wl_display_iterate(display.display, display.mask);
 501
 502         fprintf(stderr, "simple-egl exiting\n");
 503
 504         destroy_surface(&window);
 505         fini_egl(&display);
 506
 507         if (display.shell)
 508                 wl_shell_destroy(display.shell);
 509
 510         if (display.compositor)
 511                 wl_compositor_destroy(display.compositor);
 512
 513         wl_display_flush(display.display);
 514         wl_display_disconnect(display.display);
 515
 516         return 0;
 517 }