clients/wscreensaver.c

   1 /*
   2  * Copyright © 2011 Collabora, Ltd.
   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 "wscreensaver.h"
  26
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <sys/time.h>
  31
  32 #include <GL/gl.h>
  33 #include <EGL/eglext.h>
  34
  35 #include <wayland-client.h>
  36
  37 #include "desktop-shell-client-protocol.h"
  38 #include "window.h"
  39
  40 extern struct wscreensaver_plugin glmatrix_screensaver;
  41
  42 static const struct wscreensaver_plugin * const plugins[] = {
  43         &glmatrix_screensaver,
  44         NULL
  45 };
  46
  47 const char *progname = NULL;
  48
  49 static int demo_mode;
  50
  51 struct wscreensaver {
  52         struct screensaver *interface;
  53
  54         struct display *display;
  55
  56         struct ModeInfo *demomode;
  57
  58         struct {
  59                 EGLDisplay display;
  60                 EGLConfig config;
  61         } egl;
  62
  63         const struct wscreensaver_plugin *plugin;
  64 };
  65
  66 static void
  67 frame_callback(void *data, struct wl_callback *callback, uint32_t time)
  68 {
  69         struct ModeInfo *mi = data;
  70
  71         window_schedule_redraw(mi->window);
  72         wl_callback_destroy(callback);
  73 }
  74
  75 static const struct wl_callback_listener listener = {
  76         frame_callback
  77 };
  78
  79 static void
  80 redraw_handler(struct widget *widget, void *data)
  81 {
  82         struct ModeInfo *mi = data;
  83         struct wscreensaver *wscr = mi->priv;
  84         struct rectangle drawarea;
  85         struct rectangle winarea;
  86         struct wl_callback *callback;
  87         int bottom;
  88
  89         mi->swap_buffers = 0;
  90
  91         widget_get_allocation(mi->widget, &drawarea);
  92         window_get_allocation(mi->window, &winarea);
  93
  94         if (display_acquire_window_surface(wscr->display,
  95                                            mi->window,
  96                                            mi->eglctx) < 0) {
  97                 fprintf(stderr, "%s: unable to acquire window surface",
  98                         progname);
  99                 return;
 100         }
 101
 102         bottom = winarea.height - (drawarea.height + drawarea.y);
 103         glViewport(drawarea.x, bottom, drawarea.width, drawarea.height);
 104         glScissor(drawarea.x, bottom, drawarea.width, drawarea.height);
 105         glEnable(GL_SCISSOR_TEST);
 106
 107         if (mi->width != drawarea.width || mi->height != drawarea.height) {
 108                 mi->width = drawarea.width;
 109                 mi->height = drawarea.height;
 110                 wscr->plugin->reshape(mi, mi->width, mi->height);
 111         }
 112
 113         wscr->plugin->draw(mi);
 114
 115         if (mi->swap_buffers == 0)
 116                 fprintf(stderr, "%s: swapBuffers not called\n", progname);
 117
 118         display_release_window_surface(wscr->display, mi->window);
 119
 120         callback = wl_surface_frame(window_get_wl_surface(mi->window));
 121         wl_callback_add_listener(callback, &listener, mi);
 122 }
 123
 124 static void
 125 init_frand(void)
 126 {
 127         struct timeval tv;
 128         gettimeofday(&tv, NULL);
 129         srandom(tv.tv_sec * 100 + tv.tv_usec / 10000);
 130 }
 131
 132 WL_EXPORT EGLContext *
 133 init_GL(struct ModeInfo *mi)
 134 {
 135         struct wscreensaver *wscr = mi->priv;
 136         EGLContext *pctx;
 137
 138         pctx = malloc(sizeof *pctx);
 139         if (!pctx)
 140                 return NULL;
 141
 142         if (mi->eglctx != EGL_NO_CONTEXT) {
 143                 fprintf(stderr, "%s: multiple GL contexts are not supported",
 144                         progname);
 145                 goto errout;
 146         }
 147
 148         mi->eglctx = eglCreateContext(wscr->egl.display, wscr->egl.config,
 149                                       EGL_NO_CONTEXT, NULL);
 150         if (mi->eglctx == EGL_NO_CONTEXT) {
 151                 fprintf(stderr, "%s: init_GL failed to create EGL context\n",
 152                         progname);
 153                 goto errout;
 154         }
 155
 156         if (!eglMakeCurrent(wscr->egl.display, NULL, NULL, mi->eglctx)) {
 157                 fprintf(stderr, "%s: init_GL failed on eglMakeCurrent\n",
 158                         progname);
 159                 goto errout;
 160         }
 161
 162         glClearColor(0.0, 0.0, 0.0, 1.0);
 163
 164         *pctx = mi->eglctx;
 165         return pctx;
 166
 167 errout:
 168         free(pctx);
 169         return NULL;
 170 }
 171
 172 static struct ModeInfo *
 173 create_wscreensaver_instance(struct wscreensaver *screensaver,
 174                              struct wl_output *output, int width, int height)
 175 {
 176         static int instance;
 177         struct ModeInfo *mi;
 178         struct rectangle drawarea;
 179
 180         mi = calloc(1, sizeof *mi);
 181         if (!mi)
 182                 return NULL;
 183
 184         if (demo_mode)
 185                 mi->window = window_create(screensaver->display);
 186         else
 187                 mi->window = window_create_custom(screensaver->display);
 188
 189         if (!mi->window) {
 190                 fprintf(stderr, "%s: creating a window failed.\n", progname);
 191                 free(mi);
 192                 return NULL;
 193         }
 194
 195         window_set_title(mi->window, progname);
 196
 197         if (screensaver->interface && !demo_mode) {
 198                 mi->widget = window_add_widget(mi->window, mi);
 199                 screensaver_set_surface(screensaver->interface,
 200                                         window_get_wl_surface(mi->window),
 201                                         output);
 202         } else {
 203                 mi->widget = window_frame_create(mi->window, mi);
 204         }
 205         widget_set_redraw_handler(mi->widget, redraw_handler);
 206
 207         mi->priv = screensaver;
 208         mi->eglctx = EGL_NO_CONTEXT;
 209         mi->instance_number = instance++; /* XXX */
 210
 211         widget_get_allocation(mi->widget, &drawarea);
 212         mi->width = drawarea.width;
 213         mi->height = drawarea.height;
 214
 215         screensaver->plugin->init(mi);
 216
 217         window_schedule_resize(mi->window, width, height);
 218         return mi;
 219 }
 220
 221 static void
 222 handle_output_destroy(struct output *output, void *data)
 223 {
 224         /* struct ModeInfo *mi = data;
 225          * TODO */
 226 }
 227
 228 static void
 229 handle_output_configure(struct output *output, void *data)
 230 {
 231         struct wscreensaver *screensaver = data;
 232         struct ModeInfo *mi;
 233         struct rectangle area;
 234
 235         /* skip existing outputs */
 236         if (output_get_user_data(output))
 237                 return;
 238
 239         output_get_allocation(output, &area);
 240         mi = create_wscreensaver_instance(screensaver,
 241                                           output_get_wl_output(output),
 242                                           area.width, area.height);
 243         output_set_user_data(output, mi);
 244         output_set_destroy_handler(output, handle_output_destroy);
 245 }
 246
 247 static int
 248 init_wscreensaver(struct wscreensaver *wscr, struct display *display)
 249 {
 250         int size;
 251         const char prefix[] = "wscreensaver::";
 252         char *str;
 253
 254         display_set_user_data(display, wscr);
 255         wscr->display = display;
 256         wscr->plugin = plugins[0];
 257
 258         size = sizeof(prefix) + strlen(wscr->plugin->name);
 259         str = malloc(size);
 260         if (!str) {
 261                 fprintf(stderr, "init: out of memory\n");
 262                 return -1;
 263         }
 264         snprintf(str, size, "%s%s", prefix, wscr->plugin->name);
 265         progname = str;
 266
 267         wscr->egl.display = display_get_egl_display(wscr->display);
 268         if (!wscr->egl.display) {
 269                 fprintf(stderr, "init: no EGL display\n");
 270                 return -1;
 271         }
 272
 273         eglBindAPI(EGL_OPENGL_API);
 274         wscr->egl.config = display_get_argb_egl_config(wscr->display);
 275
 276         if (demo_mode) {
 277                 struct wl_output *o =
 278                         output_get_wl_output(display_get_output(display));
 279                 /* only one instance */
 280                 wscr->demomode =
 281                         create_wscreensaver_instance(wscr, o, 400, 300);
 282                 return 0;
 283         }
 284
 285         display_set_output_configure_handler(display, handle_output_configure);
 286
 287         return 0;
 288 }
 289
 290 static void
 291 global_handler(struct display *display, uint32_t name,
 292                const char *interface, uint32_t version, void *data)
 293 {
 294         struct wscreensaver *screensaver = data;
 295
 296         if (!strcmp(interface, "screensaver")) {
 297                 screensaver->interface =
 298                         display_bind(display, name, &screensaver_interface, 1);
 299         }
 300 }
 301
 302 static const struct weston_option wscreensaver_options[] = {
 303         { WESTON_OPTION_BOOLEAN, "demo", 0, &demo_mode },
 304 };
 305
 306 int main(int argc, char *argv[])
 307 {
 308         struct display *d;
 309         struct wscreensaver screensaver = { 0 };
 310
 311         init_frand();
 312
 313         parse_options(wscreensaver_options,
 314                       ARRAY_LENGTH(wscreensaver_options), &argc, argv);
 315
 316         d = display_create(&argc, argv);
 317         if (d == NULL) {
 318                 fprintf(stderr, "failed to create display: %m\n");
 319                 return EXIT_FAILURE;
 320         }
 321
 322         if (!demo_mode) {
 323                 /* iterates already known globals immediately */
 324                 display_set_user_data(d, &screensaver);
 325                 display_set_global_handler(d, global_handler);
 326                 if (!screensaver.interface) {
 327                         fprintf(stderr,
 328                                 "Server did not offer screensaver interface,"
 329                                 " exiting.\n");
 330                         return EXIT_FAILURE;
 331                 }
 332         }
 333
 334         if (init_wscreensaver(&screensaver, d) < 0) {
 335                 fprintf(stderr, "wscreensaver init failed.\n");
 336                 return EXIT_FAILURE;
 337         }
 338
 339         display_run(d);
 340
 341         free((void *)progname);
 342
 343         return EXIT_SUCCESS;
 344 }