Beispiel #1
0
static void
shell_fonts_init (void)
{
  CoglPangoFontMap *fontmap;

  /* Disable text mipmapping; it causes problems on pre-GEM Intel
   * drivers and we should just be rendering text at the right
   * size rather than scaling it. If we do effects where we dynamically
   * zoom labels, then we might want to reconsider.
   */
  fontmap = COGL_PANGO_FONT_MAP (clutter_get_font_map ());
  cogl_pango_font_map_set_use_mipmapping (fontmap, FALSE);
}
static void
update_fps (ClutterActor *stage,
            GTimer       *timer)
{
  static PangoLayout *layout = NULL;
  static guint counter = 0;
  static CoglColor white;
  gdouble resolution;
  gchar *text;

  if (!layout)
    {
      PangoFontDescription *pango_font_desc;
      CoglPangoFontMap *pango_font_map;
      PangoContext *pango_context;

      cogl_color_set_from_4ub (&white, 0xff, 0xff, 0xff, 0xff);

      pango_font_map = COGL_PANGO_FONT_MAP (cogl_pango_font_map_new());

      resolution = clutter_backend_get_resolution (clutter_get_default_backend ());

      cogl_pango_font_map_set_resolution (pango_font_map, resolution);
      cogl_pango_font_map_set_use_mipmapping (pango_font_map, TRUE);

      pango_context = cogl_pango_font_map_create_context (pango_font_map);

      pango_font_desc = pango_font_description_new ();
      pango_font_description_set_family (pango_font_desc, "Sans");
      pango_font_description_set_size (pango_font_desc, 30 * PANGO_SCALE);

      layout = pango_layout_new (pango_context);
      pango_layout_set_font_description (layout, pango_font_desc);

      pango_font_description_free (pango_font_desc);
      g_object_unref (pango_context);
    }

  if (g_timer_elapsed (timer, NULL) > 0.5)
    {
      text = g_strdup_printf ("%dfps", counter * 2);
      pango_layout_set_text (layout, text, -1);
      g_free (text);
      g_timer_start (timer);
      counter = 0;
    }
  else
    counter++;

  cogl_pango_render_layout (layout, 0, 0, &white, 0);
}
Beispiel #3
0
int
main (int argc, char **argv)
{
  CoglContext *ctx;
  CoglOnscreen *onscreen;
  CoglFramebuffer *fb;
  GError *error = NULL;
  Data data;
  PangoRectangle hello_label_size;
  float fovy, aspect, z_near, z_2d, z_far;
  CoglDepthState depth_state;
  CoglBool has_swap_notify;

  ctx = cogl_context_new (NULL, &error);
  if (!ctx) {
      fprintf (stderr, "Failed to create context: %s\n", error->message);
      return 1;
  }

  onscreen = cogl_onscreen_new (ctx, 640, 480);
  fb = COGL_FRAMEBUFFER (onscreen);
  data.fb = fb;
  data.framebuffer_width = cogl_framebuffer_get_width (fb);
  data.framebuffer_height = cogl_framebuffer_get_height (fb);

  data.timer = g_timer_new ();

  cogl_onscreen_show (onscreen);

  cogl_framebuffer_set_viewport (fb,
                                 0, 0,
                                 data.framebuffer_width,
                                 data.framebuffer_height);

  fovy = 60; /* y-axis field of view */
  aspect = (float)data.framebuffer_width/(float)data.framebuffer_height;
  z_near = 0.1; /* distance to near clipping plane */
  z_2d = 1000; /* position to 2d plane */
  z_far = 2000; /* distance to far clipping plane */

  cogl_framebuffer_perspective (fb, fovy, aspect, z_near, z_far);

  /* Since the pango renderer emits geometry in pixel/device coordinates
   * and the anti aliasing is implemented with the assumption that the
   * geometry *really* does end up pixel aligned, we setup a modelview
   * matrix so that for geometry in the plane z = 0 we exactly map x
   * coordinates in the range [0,stage_width] and y coordinates in the
   * range [0,stage_height] to the framebuffer extents with (0,0) being
   * the top left.
   *
   * This is roughly what Clutter does for a ClutterStage, but this
   * demonstrates how it is done manually using Cogl.
   */
  cogl_matrix_init_identity (&data.view);
  cogl_matrix_view_2d_in_perspective (&data.view, fovy, aspect, z_near, z_2d,
                                      data.framebuffer_width,
                                      data.framebuffer_height);
  cogl_framebuffer_set_modelview_matrix (fb, &data.view);

  /* Initialize some convenient constants */
  cogl_matrix_init_identity (&identity);
  cogl_color_set_from_4ub (&white, 0xff, 0xff, 0xff, 0xff);

  /* rectangle indices allow the GPU to interpret a list of quads (the
   * faces of our cube) as a list of triangles.
   *
   * Since this is a very common thing to do
   * cogl_get_rectangle_indices() is a convenience function for
   * accessing internal index buffers that can be shared.
   */
  data.indices = cogl_get_rectangle_indices (ctx, 6 /* n_rectangles */);
  data.prim = cogl_primitive_new_p3t2 (ctx, COGL_VERTICES_MODE_TRIANGLES,
                                       G_N_ELEMENTS (vertices),
                                       vertices);
  /* Each face will have 6 indices so we have 6 * 6 indices in total... */
  cogl_primitive_set_indices (data.prim,
                              data.indices,
                              6 * 6);

  /* Load a jpeg crate texture from a file */
  printf ("crate.jpg (CC by-nc-nd http://bit.ly/9kP45T) ShadowRunner27 http://bit.ly/m1YXLh\n");
  data.texture = cogl_texture_new_from_file (COGL_EXAMPLES_DATA "crate.jpg",
                                             COGL_TEXTURE_NO_SLICING,
                                             COGL_PIXEL_FORMAT_ANY,
                                             &error);
  if (!data.texture)
    g_error ("Failed to load texture: %s", error->message);

  /* a CoglPipeline conceptually describes all the state for vertex
   * processing, fragment processing and blending geometry. When
   * drawing the geometry for the crate this pipeline says to sample a
   * single texture during fragment processing... */
  data.crate_pipeline = cogl_pipeline_new (ctx);
  cogl_pipeline_set_layer_texture (data.crate_pipeline, 0, data.texture);

  /* Since the box is made of multiple triangles that will overlap
   * when drawn and we don't control the order they are drawn in, we
   * enable depth testing to make sure that triangles that shouldn't
   * be visible get culled by the GPU. */
  cogl_depth_state_init (&depth_state);
  cogl_depth_state_set_test_enabled (&depth_state, TRUE);

  cogl_pipeline_set_depth_state (data.crate_pipeline, &depth_state, NULL);

  /* Setup a Pango font map and context */

  data.pango_font_map = COGL_PANGO_FONT_MAP (cogl_pango_font_map_new (ctx));

  cogl_pango_font_map_set_use_mipmapping (data.pango_font_map, TRUE);

  data.pango_context =
    pango_font_map_create_context (PANGO_FONT_MAP (data.pango_font_map));

  data.pango_font_desc = pango_font_description_new ();
  pango_font_description_set_family (data.pango_font_desc, "Sans");
  pango_font_description_set_size (data.pango_font_desc, 30 * PANGO_SCALE);

  /* Setup the "Hello Cogl" text */

  data.hello_label = pango_layout_new (data.pango_context);
  pango_layout_set_font_description (data.hello_label, data.pango_font_desc);
  pango_layout_set_text (data.hello_label, "Hello Cogl", -1);

  pango_layout_get_extents (data.hello_label, NULL, &hello_label_size);
  data.hello_label_width = PANGO_PIXELS (hello_label_size.width);
  data.hello_label_height = PANGO_PIXELS (hello_label_size.height);

  data.swap_ready = TRUE;

  has_swap_notify =
    cogl_has_feature (ctx, COGL_FEATURE_ID_SWAP_BUFFERS_EVENT);

  if (has_swap_notify)
    cogl_onscreen_add_swap_buffers_callback (COGL_ONSCREEN (fb),
                                             swap_notify_cb,
                                             &data);

  while (1)
    {
      CoglPollFD *poll_fds;
      int n_poll_fds;
      int64_t timeout;

      if (data.swap_ready)
        {
          paint (&data);
          cogl_onscreen_swap_buffers (COGL_ONSCREEN (fb));
        }

      cogl_poll_get_info (ctx, &poll_fds, &n_poll_fds, &timeout);

      if (!has_swap_notify)
        {
          /* If the winsys doesn't support swap event notification
             then we'll just redraw constantly */
          data.swap_ready = TRUE;
          timeout = 0;
        }

      g_poll ((GPollFD *) poll_fds, n_poll_fds,
              timeout == -1 ? -1 : timeout / 1000);

      cogl_poll_dispatch (ctx, poll_fds, n_poll_fds);
    }

  return 0;
}