int
main (int argc, char **argv)
{
CoglContext *ctx;
CoglOnscreen *onscreen;
CoglFramebuffer *fb;
CoglError *error = NULL;
Data data;
PangoRectangle hello_label_size;
float fovy, aspect, z_near, z_2d, z_far;
CoglDepthState depth_state;
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_init_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 (
cogl_texture_2d_new_from_file (ctx,
COGL_EXAMPLES_DATA "crate.jpg",
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;
cogl_onscreen_add_frame_callback (COGL_ONSCREEN (fb),
frame_event_cb,
&data,
NULL); /* destroy notify */
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_renderer_get_info (cogl_context_get_renderer (ctx),
&poll_fds, &n_poll_fds, &timeout);
g_poll ((GPollFD *) poll_fds, n_poll_fds,
timeout == -1 ? -1 : timeout / 1000);
cogl_poll_renderer_dispatch (cogl_context_get_renderer (ctx),
poll_fds, n_poll_fds);
}
return 0;
}
static CoglBool
cogl_glib_source_prepare (GSource *source, int *timeout)
{
CoglGLibSource *cogl_source = (CoglGLibSource *) source;
CoglPollFD *poll_fds;
int n_poll_fds;
int64_t cogl_timeout;
int age;
int i;
age = cogl_poll_renderer_get_info (cogl_source->renderer,
&poll_fds,
&n_poll_fds,
&cogl_timeout);
/* We have to be careful not to call g_source_add/remove_poll unless
* the FDs have changed because it will cause the main loop to
* immediately wake up. If we call it every time the source is
* prepared it will effectively never go idle. */
if (age != cogl_source->poll_fds_age)
{
/* Remove any existing polls before adding the new ones */
for (i = 0; i < cogl_source->poll_fds->len; i++)
{
GPollFD *poll_fd = &g_array_index (cogl_source->poll_fds, GPollFD, i);
g_source_remove_poll (source, poll_fd);
}
g_array_set_size (cogl_source->poll_fds, n_poll_fds);
for (i = 0; i < n_poll_fds; i++)
{
GPollFD *poll_fd = &g_array_index (cogl_source->poll_fds, GPollFD, i);
poll_fd->fd = poll_fds[i].fd;
g_source_add_poll (source, poll_fd);
}
}
cogl_source->poll_fds_age = age;
/* Update the events */
for (i = 0; i < n_poll_fds; i++)
{
GPollFD *poll_fd = &g_array_index (cogl_source->poll_fds, GPollFD, i);
poll_fd->events = poll_fds[i].events;
poll_fd->revents = 0;
}
if (cogl_timeout == -1)
{
*timeout = -1;
cogl_source->expiration_time = -1;
}
else
{
/* Round up to ensure that we don't try again too early */
*timeout = (cogl_timeout + 999) / 1000;
cogl_source->expiration_time = (g_source_get_time (source) +
cogl_timeout);
}
return *timeout == 0;
}
