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compositor-wayland.c

/*
 * Copyright © 2010 Benjamin Franzke
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stddef.h>
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>

#include <wayland-client.h>
#include <wayland-egl.h>

#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>

#include "compositor.h"

00041 struct wayland_compositor {
      struct wlsc_compositor   base;

      struct {
            struct wl_display *display;
            struct wl_compositor *compositor;
            struct wl_shell *shell;
            struct wl_output *output;
            struct wl_visual *visual;

            struct {
                  int32_t x, y, width, height;
            } screen_allocation;

            struct wl_event_source *wl_source;
            uint32_t event_mask;
      } parent;

      struct wl_list input_list;
};

00062 struct wayland_output {
      struct wlsc_output      base;

      struct {
            struct wl_surface *surface;
            struct wl_egl_window    *egl_window;
      } parent;
      EGLSurface egl_surface;
      struct wlsc_mode  mode;
};

00073 struct wayland_input {
      struct wayland_compositor *compositor;
      struct wl_input_device *input_device;
      struct wl_list link;
};

static int
wayland_input_create(struct wayland_compositor *c)
{
      struct wlsc_input_device *input;

      input = malloc(sizeof *input);
      if (input == NULL)
            return -1;

      memset(input, 0, sizeof *input);
      wlsc_input_device_init(input, &c->base);

      c->base.input_device = &input->input_device;

      return 0;
}

static int
wayland_compositor_init_egl(struct wayland_compositor *c)
{
      EGLint major, minor;
      EGLint n;
      const char *extensions;
      EGLint config_attribs[] = {
            EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
            EGL_RED_SIZE, 1,
            EGL_GREEN_SIZE, 1,
            EGL_BLUE_SIZE, 1,
            EGL_DEPTH_SIZE, 1,
            EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
            EGL_NONE
      };
      static const EGLint context_attribs[] = {
            EGL_CONTEXT_CLIENT_VERSION, 2,
            EGL_NONE
      };

      setenv("EGL_PLATFORM", "wayland", 1);
      c->base.display = eglGetDisplay(c->parent.display);
      if (c->base.display == NULL) {
            fprintf(stderr, "failed to create display\n");
            return -1;
      }

      if (!eglInitialize(c->base.display, &major, &minor)) {
            fprintf(stderr, "failed to initialize display\n");
            return -1;
      }

      extensions = eglQueryString(c->base.display, EGL_EXTENSIONS);
      if (!strstr(extensions, "EGL_KHR_surfaceless_opengl")) {
            fprintf(stderr, "EGL_KHR_surfaceless_opengl not available\n");
            return -1;
      }

      if (!eglBindAPI(EGL_OPENGL_ES_API)) {
            fprintf(stderr, "failed to bind EGL_OPENGL_ES_API\n");
            return -1;
      }
      if (!eglChooseConfig(c->base.display, config_attribs,
                       &c->base.config, 1, &n) || n == 0) {
            fprintf(stderr, "failed to choose config: %d\n", n);
            return -1;
      }

      c->base.context = eglCreateContext(c->base.display, c->base.config,
                                 EGL_NO_CONTEXT, context_attribs);
      if (c->base.context == NULL) {
            fprintf(stderr, "failed to create context\n");
            return -1;
      }

      if (!eglMakeCurrent(c->base.display, EGL_NO_SURFACE,
                      EGL_NO_SURFACE, c->base.context)) {
            fprintf(stderr, "failed to make context current\n");
            return -1;
      }

      return 0;
}

static void
frame_callback(struct wl_surface *surface, void *data, uint32_t time)
{
      struct wlsc_output *output = data;

      wlsc_output_finish_frame(output, time);
}

static int
wayland_output_prepare_render(struct wlsc_output *output_base)
{
      struct wayland_output *output = (struct wayland_output *) output_base;
      struct wlsc_compositor *ec = output->base.compositor;

      if (!eglMakeCurrent(ec->display, output->egl_surface,
                      output->egl_surface, ec->context)) {
            fprintf(stderr, "failed to make current\n");
            return -1;
      }

      return 0;
}

static int
wayland_output_present(struct wlsc_output *output_base)
{
      struct wayland_output *output = (struct wayland_output *) output_base;
      struct wayland_compositor *c =
            (struct wayland_compositor *) output->base.compositor;

      if (wayland_output_prepare_render(&output->base))
            return -1;

      eglSwapBuffers(c->base.display, output->egl_surface);
      wl_display_frame_callback(c->parent.display,
                          output->parent.surface,
                          frame_callback, &output->base);

      return 0;
}

static int
wayland_output_prepare_scanout_surface(struct wlsc_output *output_base,
                               struct wlsc_surface *es)
{
      return -1;
}

static int
wayland_output_set_cursor(struct wlsc_output *output_base,
                    struct wlsc_input_device *input)
{
      return -1;
}

static int
wayland_compositor_create_output(struct wayland_compositor *c,
                         int width, int height)
{
      struct wayland_output *output;

      output = malloc(sizeof *output);
      if (output == NULL)
            return -1;
      memset(output, 0, sizeof *output);

      output->mode.flags =
            WL_OUTPUT_MODE_CURRENT | WL_OUTPUT_MODE_PREFERRED;
      output->mode.width = width;
      output->mode.height = height;
      output->mode.refresh = 60;
      wl_list_init(&output->base.mode_list);
      wl_list_insert(&output->base.mode_list, &output->mode.link);

      output->base.current = &output->mode;
      wlsc_output_init(&output->base, &c->base, 0, 0, width, height,
                   WL_OUTPUT_FLIPPED);

      output->parent.surface =
            wl_compositor_create_surface(c->parent.compositor);
      wl_surface_set_user_data(output->parent.surface, output);

      output->parent.egl_window =
            wl_egl_window_create(output->parent.surface,
                             width, height, c->parent.visual);
      if (!output->parent.egl_window) {
            fprintf(stderr, "failure to create wl_egl_window\n");
            goto cleanup_output;
      }

      output->egl_surface =
            eglCreateWindowSurface(c->base.display, c->base.config,
                               output->parent.egl_window, NULL);
      if (!output->egl_surface) {
            fprintf(stderr, "failed to create window surface\n");
            goto cleanup_window;
      }

      if (!eglMakeCurrent(c->base.display, output->egl_surface,
                      output->egl_surface, c->base.context)) {
            fprintf(stderr, "failed to make surface current\n");
            goto cleanup_surface;
            return -1;
      }

      wl_shell_set_toplevel(c->parent.shell, output->parent.surface);

      glClearColor(0, 0, 0, 0.5);

      output->base.prepare_render = wayland_output_prepare_render;
      output->base.present = wayland_output_present;
      output->base.prepare_scanout_surface =
            wayland_output_prepare_scanout_surface;
      output->base.set_hardware_cursor = wayland_output_set_cursor;

      wl_list_insert(c->base.output_list.prev, &output->base.link);

      return 0;

cleanup_surface:
      eglDestroySurface(c->base.display, output->egl_surface);
cleanup_window:
      wl_egl_window_destroy(output->parent.egl_window);
cleanup_output:
      /* FIXME: cleanup wlsc_output */
      free(output);

      return -1;
}

/* Events received from the wayland-server this compositor is client of: */

/* parent output interface */
static void
display_handle_geometry(void *data,
                  struct wl_output *wl_output,
                  int x,
                  int y,
                  int physical_width,
                  int physical_height,
                  int subpixel,
                  const char *make,
                  const char *model)
{
      struct wayland_compositor *c = data;

      c->parent.screen_allocation.x = x;
      c->parent.screen_allocation.y = y;
}

static void
display_handle_mode(void *data,
                struct wl_output *wl_output,
                uint32_t flags,
                int width,
                int height,
                int refresh)
{
      struct wayland_compositor *c = data;

      c->parent.screen_allocation.width = width;
      c->parent.screen_allocation.height = height;
}

static const struct wl_output_listener output_listener = {
      display_handle_geometry,
      display_handle_mode
};

/* parent shell interface */
static void
handle_configure(void *data, struct wl_shell *shell,
             uint32_t time, uint32_t edges,
             struct wl_surface *surface, int32_t width, int32_t height)
{
#if 0
      struct output *output = wl_surface_get_user_data(surface);

      /* FIXME: add resize? */
#endif
}

static const struct wl_shell_listener shell_listener = {
      handle_configure,
};

/* parent input interface */
static void
input_handle_motion(void *data, struct wl_input_device *input_device,
                 uint32_t time,
                 int32_t x, int32_t y, int32_t sx, int32_t sy)
{
      struct wayland_input *input = data;
      struct wayland_compositor *c = input->compositor;

      notify_motion(c->base.input_device, time, sx, sy);
}

static void
input_handle_button(void *data,
                 struct wl_input_device *input_device,
                 uint32_t time, uint32_t button, uint32_t state)
{
      struct wayland_input *input = data;
      struct wayland_compositor *c = input->compositor;

      notify_button(c->base.input_device, time, button, state);
}

static void
input_handle_key(void *data, struct wl_input_device *input_device,
              uint32_t time, uint32_t key, uint32_t state)
{
      struct wayland_input *input = data;
      struct wayland_compositor *c = input->compositor;

      notify_key(c->base.input_device, time, key, state);
}

static void
input_handle_pointer_focus(void *data,
                      struct wl_input_device *input_device,
                      uint32_t time, struct wl_surface *surface,
                      int32_t x, int32_t y, int32_t sx, int32_t sy)
{
      struct wayland_input *input = data;
      struct wayland_output *output;
      struct wayland_compositor *c = input->compositor;

      if (surface) {
            output = wl_surface_get_user_data(surface);
            notify_pointer_focus(c->base.input_device,
                             time, &output->base, sx, sy);
      } else {
            notify_pointer_focus(c->base.input_device, time, NULL, 0, 0);
      }
}

static void
input_handle_keyboard_focus(void *data,
                       struct wl_input_device *input_device,
                       uint32_t time,
                       struct wl_surface *surface,
                       struct wl_array *keys)
{
      struct wayland_input *input = data;
      struct wayland_compositor *c = input->compositor;
      struct wayland_output *output;

      if (surface) {
            output = wl_surface_get_user_data(surface);
            notify_keyboard_focus(c->base.input_device,
                              time, &output->base, keys);
      } else {
            notify_keyboard_focus(c->base.input_device, time, NULL, NULL);
      }
}

static const struct wl_input_device_listener input_device_listener = {
      input_handle_motion,
      input_handle_button,
      input_handle_key,
      input_handle_pointer_focus,
      input_handle_keyboard_focus,
};

static void
display_add_input(struct wayland_compositor *c, uint32_t id)
{
      struct wayland_input *input;

      input = malloc(sizeof *input);
      if (input == NULL)
            return;

      memset(input, 0, sizeof *input);

      input->compositor = c;
      input->input_device = wl_input_device_create(c->parent.display, id, 1);
      wl_list_insert(c->input_list.prev, &input->link);

      wl_input_device_add_listener(input->input_device,
                             &input_device_listener, input);
      wl_input_device_set_user_data(input->input_device, input);
}

static void
compositor_handle_visual(void *data,
                   struct wl_compositor *compositor,
                   uint32_t id, uint32_t token)
{
      struct wayland_compositor *c = data;

      switch (token) {
      case WL_COMPOSITOR_VISUAL_ARGB32:
            c->parent.visual = wl_visual_create(c->parent.display, id, 1);
            break;
      }
}

static const struct wl_compositor_listener compositor_listener = {
      compositor_handle_visual,
};

static void
display_handle_global(struct wl_display *display, uint32_t id,
                  const char *interface, uint32_t version, void *data)
{
      struct wayland_compositor *c = data;

      if (strcmp(interface, "wl_compositor") == 0) {
            c->parent.compositor = wl_compositor_create(display, id, 1);
            wl_compositor_add_listener(c->parent.compositor,
                                 &compositor_listener, c);
      } else if (strcmp(interface, "wl_output") == 0) {
            c->parent.output = wl_output_create(display, id, 1);
            wl_output_add_listener(c->parent.output, &output_listener, c);
      } else if (strcmp(interface, "wl_input_device") == 0) {
            display_add_input(c, id);
      } else if (strcmp(interface, "wl_shell") == 0) {
            c->parent.shell = wl_shell_create(display, id, 1);
            wl_shell_add_listener(c->parent.shell, &shell_listener, c);
      }
}

static int
update_event_mask(uint32_t mask, void *data)
{
      struct wayland_compositor *c = data;

      c->parent.event_mask = mask;
      if (c->parent.wl_source)
            wl_event_source_fd_update(c->parent.wl_source, mask);

      return 0;
}

static int
wayland_compositor_handle_event(int fd, uint32_t mask, void *data)
{
      struct wayland_compositor *c = data;

      if (mask & WL_EVENT_READABLE)
            wl_display_iterate(c->parent.display, WL_DISPLAY_READABLE);
      if (mask & WL_EVENT_WRITEABLE)
            wl_display_iterate(c->parent.display, WL_DISPLAY_WRITABLE);

      return 1;
}

static void
wayland_destroy(struct wlsc_compositor *ec)
{
      free(ec);
}

static struct wlsc_compositor *
wayland_compositor_create(struct wl_display *display, int width, int height)
{
      struct wayland_compositor *c;
      struct wl_event_loop *loop;
      int fd;

      c = malloc(sizeof *c);
      if (c == NULL)
            return NULL;

      memset(c, 0, sizeof *c);

      c->parent.display = wl_display_connect(NULL);

      if (c->parent.display == NULL) {
            fprintf(stderr, "failed to create display: %m\n");
            return NULL;
      }

      wl_list_init(&c->input_list);
      wl_display_add_global_listener(c->parent.display,
                        display_handle_global, c);

      wl_display_iterate(c->parent.display, WL_DISPLAY_READABLE);

      c->base.wl_display = display;
      if (wayland_compositor_init_egl(c) < 0)
            return NULL;

      c->base.destroy = wayland_destroy;

      /* Can't init base class until we have a current egl context */
      if (wlsc_compositor_init(&c->base, display) < 0)
            return NULL;

      if (wayland_compositor_create_output(c, width, height) < 0)
            return NULL;

      if (wayland_input_create(c) < 0)
            return NULL;

      loop = wl_display_get_event_loop(c->base.wl_display);

      fd = wl_display_get_fd(c->parent.display, update_event_mask, c);
      c->parent.wl_source =
            wl_event_loop_add_fd(loop, fd, c->parent.event_mask,
                             wayland_compositor_handle_event, c);
      if (c->parent.wl_source == NULL)
            return NULL;

      return &c->base;
}

struct wlsc_compositor *
backend_init(struct wl_display *display, char *options);

WL_EXPORT struct wlsc_compositor *
backend_init(struct wl_display *display, char *options)
{
      int width = 1024, height = 640, i;
      char *p, *value;

      static char * const tokens[] = { "width", "height", NULL };
      
      p = options;
      while (i = getsubopt(&p, tokens, &value), i != -1) {
            switch (i) {
            case 0:
                  width = strtol(value, NULL, 0);
                  break;
            case 1:
                  height = strtol(value, NULL, 0);
                  break;
            }
      }

      return wayland_compositor_create(display, width, height);
}

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