static CoglDisplay *
clutter_backend_wayland_get_display (ClutterBackend *backend,
CoglRenderer *renderer,
CoglSwapChain *swap_chain,
GError **error)
{
CoglOnscreenTemplate *onscreen_template = NULL;
CoglDisplay *display;
onscreen_template = cogl_onscreen_template_new (swap_chain);
/* XXX: I have some doubts that this is a good design.
* Conceptually should we be able to check an onscreen_template
* without more details about the CoglDisplay configuration?
*/
if (!cogl_renderer_check_onscreen_template (renderer,
onscreen_template,
error))
goto error;
display = cogl_display_new (renderer, onscreen_template);
return display;
error:
if (onscreen_template)
cogl_object_unref (onscreen_template);
return NULL;
}
static CoglDisplay *
clutter_backend_cex100_get_display (ClutterBackend *backend,
CoglRenderer *renderer,
CoglSwapChain *swap_chain,
GError **error)
{
CoglOnscreenTemplate *onscreen_template = NULL;
CoglDisplay *display;
swap_chain = cogl_swap_chain_new ();
#if defined(COGL_HAS_GDL_SUPPORT)
cogl_swap_chain_set_length (swap_chain, gdl_n_buffers);
#endif
onscreen_template = cogl_onscreen_template_new (swap_chain);
/* XXX: I have some doubts that this is a good design.
* Conceptually should we be able to check an onscreen_template
* without more details about the CoglDisplay configuration?
*/
if (!cogl_renderer_check_onscreen_template (renderer,
onscreen_template,
error))
goto error;
display = cogl_display_new (renderer, onscreen_template);
#if defined(COGL_HAS_GDL_SUPPORT)
cogl_gdl_display_set_plane (cogl_display, gdl_plane);
#endif
return display;
}
static gboolean
clutter_backend_win32_create_context (ClutterBackend *backend,
GError **error)
{
CoglSwapChain *swap_chain;
CoglOnscreenTemplate *onscreen_template;
if (backend->cogl_context)
return TRUE;
backend->cogl_renderer = cogl_renderer_new ();
if (!cogl_renderer_connect (backend->cogl_renderer, error))
goto error;
swap_chain = cogl_swap_chain_new ();
onscreen_template = cogl_onscreen_template_new (swap_chain);
cogl_object_unref (swap_chain);
if (!cogl_renderer_check_onscreen_template (backend->cogl_renderer,
onscreen_template,
error))
goto error;
backend->cogl_display = cogl_display_new (backend->cogl_renderer,
onscreen_template);
cogl_object_unref (backend->cogl_renderer);
cogl_object_unref (onscreen_template);
if (!cogl_display_setup (backend->cogl_display, error))
goto error;
backend->cogl_context = cogl_context_new (backend->cogl_display, error);
if (!backend->cogl_context)
goto error;
return TRUE;
error:
if (backend->cogl_display)
{
cogl_object_unref (backend->cogl_display);
backend->cogl_display = NULL;
}
if (onscreen_template)
cogl_object_unref (onscreen_template);
if (swap_chain)
cogl_object_unref (swap_chain);
if (backend->cogl_renderer)
{
cogl_object_unref (backend->cogl_renderer);
backend->cogl_renderer = NULL;
}
return FALSE;
}
static CoglDisplay *
clutter_backend_x11_get_display (ClutterBackend *backend,
CoglRenderer *renderer,
CoglSwapChain *swap_chain,
GError **error)
{
CoglOnscreenTemplate *onscreen_template;
CoglDisplay *display = NULL;
gboolean res = FALSE;
CLUTTER_NOTE (BACKEND, "Creating CoglDisplay, alpha=%s, stereo=%s",
clutter_enable_argb ? "enabled" : "disabled",
clutter_enable_stereo ? "enabled" : "disabled");
onscreen_template = cogl_onscreen_template_new (swap_chain);
/* It's possible that the current renderer doesn't support transparency
* or doesn't support stereo, so we try the different combinations.
*/
if (clutter_enable_argb && clutter_enable_stereo)
res = check_onscreen_template (renderer, swap_chain, onscreen_template,
TRUE, TRUE, error);
/* Prioritize stereo over alpha */
if (!res && clutter_enable_stereo)
res = check_onscreen_template (renderer, swap_chain, onscreen_template,
FALSE, TRUE, error);
if (!res && clutter_enable_argb)
res = check_onscreen_template (renderer, swap_chain, onscreen_template,
TRUE, FALSE, error);
if (!res)
res = check_onscreen_template (renderer, swap_chain, onscreen_template,
FALSE, FALSE, error);
if (res)
display = cogl_display_new (renderer, onscreen_template);
cogl_object_unref (onscreen_template);
return display;
}
void
cogl_display_set_onscreen_template (CoglDisplay *display,
CoglOnscreenTemplate *onscreen_template)
{
_COGL_RETURN_IF_FAIL (display->setup == FALSE);
if (onscreen_template)
cogl_object_ref (onscreen_template);
if (display->onscreen_template)
cogl_object_unref (display->onscreen_template);
display->onscreen_template = onscreen_template;
/* NB: we want to maintain the invariable that there is always an
* onscreen template associated with a CoglDisplay... */
if (!onscreen_template)
display->onscreen_template = cogl_onscreen_template_new (NULL);
}
int
main (int argc, char **argv)
{
CoglOnscreenTemplate *onscreen_template;
CoglDisplay *display;
CoglContext *ctx;
CoglOnscreen *onscreen;
CoglFramebuffer *fb;
CoglError *error = NULL;
CoglVertexP2C4 triangle_vertices[] = {
{0, 0.7, 0xff, 0x00, 0x00, 0x80},
{-0.7, -0.7, 0x00, 0xff, 0x00, 0xff},
{0.7, -0.7, 0x00, 0x00, 0xff, 0xff}
};
CoglPrimitive *triangle;
CoglTexture *tex;
CoglOffscreen *offscreen;
CoglFramebuffer *offscreen_fb;
CoglPipeline *pipeline;
onscreen_template = cogl_onscreen_template_new (NULL);
cogl_onscreen_template_set_samples_per_pixel (onscreen_template, 4);
display = cogl_display_new (NULL, onscreen_template);
if (!cogl_display_setup (display, &error))
{
fprintf (stderr, "Platform doesn't support onscreen 4x msaa rendering: %s\n",
error->message);
return 1;
}
ctx = cogl_context_new (display, &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);
cogl_framebuffer_set_samples_per_pixel (fb, 4);
if (!cogl_framebuffer_allocate (fb, &error))
{
fprintf (stderr, "Failed to allocate 4x msaa offscreen framebuffer, "
"disabling msaa for onscreen rendering: %s\n", error->message);
cogl_error_free (error);
cogl_framebuffer_set_samples_per_pixel (fb, 0);
error = NULL;
if (!cogl_framebuffer_allocate (fb, &error))
{
fprintf (stderr, "Failed to allocate framebuffer: %s\n", error->message);
return 1;
}
}
cogl_onscreen_show (onscreen);
tex = cogl_texture_new_with_size (ctx,
320, 480,
COGL_TEXTURE_NO_SLICING,
COGL_PIXEL_FORMAT_ANY);
offscreen = cogl_offscreen_new_to_texture (tex);
offscreen_fb = COGL_FRAMEBUFFER (offscreen);
cogl_framebuffer_set_samples_per_pixel (offscreen_fb, 4);
if (!cogl_framebuffer_allocate (offscreen_fb, &error))
{
cogl_error_free (error);
error = NULL;
fprintf (stderr, "Failed to allocate 4x msaa offscreen framebuffer, "
"disabling msaa for offscreen rendering");
cogl_framebuffer_set_samples_per_pixel (offscreen_fb, 0);
}
triangle = cogl_primitive_new_p2c4 (ctx, COGL_VERTICES_MODE_TRIANGLES,
3, triangle_vertices);
pipeline = cogl_pipeline_new (ctx);
for (;;) {
CoglPollFD *poll_fds;
int n_poll_fds;
int64_t timeout;
CoglPipeline *texture_pipeline;
cogl_framebuffer_clear4f (fb, COGL_BUFFER_BIT_COLOR, 0, 0, 0, 1);
cogl_framebuffer_push_matrix (fb);
cogl_framebuffer_scale (fb, 0.5, 1, 1);
cogl_framebuffer_translate (fb, -1, 0, 0);
cogl_framebuffer_draw_primitive (fb, pipeline, triangle);
cogl_framebuffer_pop_matrix (fb);
cogl_framebuffer_draw_primitive (fb, pipeline, triangle);
cogl_framebuffer_resolve_samples (offscreen_fb);
texture_pipeline = cogl_pipeline_new (ctx);
cogl_pipeline_set_layer_texture (texture_pipeline, 0, tex);
cogl_framebuffer_draw_rectangle (fb, texture_pipeline, 0, 1, 1, -1);
cogl_object_unref (texture_pipeline);
cogl_onscreen_swap_buffers (onscreen);
cogl_poll_get_info (ctx, &poll_fds, &n_poll_fds, &timeout);
g_poll ((GPollFD *) poll_fds, n_poll_fds, 0);
cogl_poll_dispatch (ctx, poll_fds, n_poll_fds);
}
return 0;
}
static CoglDisplay *
clutter_backend_gdk_get_display (ClutterBackend *backend,
CoglRenderer *renderer,
CoglSwapChain *swap_chain,
GError **error)
{
ClutterBackendGdk *backend_gdk = CLUTTER_BACKEND_GDK (backend);
CoglOnscreenTemplate *onscreen_template;
GError *internal_error = NULL;
CoglDisplay *display;
gboolean has_rgba_visual;
gboolean res;
has_rgba_visual = gdk_screen_get_rgba_visual (backend_gdk->screen) == NULL;
CLUTTER_NOTE (BACKEND, "Alpha on Cogl swap chain: %s",
has_rgba_visual ? "enabled" : "disabled");
cogl_swap_chain_set_has_alpha (swap_chain, has_rgba_visual);
onscreen_template = cogl_onscreen_template_new (swap_chain);
res = cogl_renderer_check_onscreen_template (renderer,
onscreen_template,
&internal_error);
if (!res && has_rgba_visual)
{
CLUTTER_NOTE (BACKEND,
"Creation of a context with a ARGB visual failed: %s",
internal_error != NULL ? internal_error->message
: "Unknown reason");
g_clear_error (&internal_error);
/* It's possible that the current renderer doesn't support transparency
* in a swap_chain so lets see if we can fallback to not having any
* transparency...
*
* XXX: It might be nice to have a CoglRenderer feature we could
* explicitly check for ahead of time.
*/
cogl_swap_chain_set_has_alpha (swap_chain, FALSE);
res = cogl_renderer_check_onscreen_template (renderer,
onscreen_template,
&internal_error);
}
if (!res)
{
g_set_error_literal (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
internal_error->message);
g_error_free (internal_error);
cogl_object_unref (onscreen_template);
return NULL;
}
display = cogl_display_new (renderer, onscreen_template);
cogl_object_unref (onscreen_template);
return display;
}
static gboolean
clutter_backend_real_create_context (ClutterBackend *backend,
GError **error)
{
ClutterBackendClass *klass;
CoglSwapChain *swap_chain;
GError *internal_error;
if (backend->cogl_context != NULL)
return TRUE;
klass = CLUTTER_BACKEND_GET_CLASS (backend);
swap_chain = NULL;
internal_error = NULL;
CLUTTER_NOTE (BACKEND, "Creating Cogl renderer");
if (klass->get_renderer != NULL)
backend->cogl_renderer = klass->get_renderer (backend, &internal_error);
else
backend->cogl_renderer = cogl_renderer_new ();
if (backend->cogl_renderer == NULL)
goto error;
#ifdef HAVE_CLUTTER_WAYLAND_COMPOSITOR
/* If the application is trying to act as a Wayland compositor then
it needs to have an EGL-based renderer backend */
if (_wayland_compositor_display)
cogl_renderer_add_constraint (backend->cogl_renderer,
COGL_RENDERER_CONSTRAINT_USES_EGL);
#endif
CLUTTER_NOTE (BACKEND, "Connecting the renderer");
if (!cogl_renderer_connect (backend->cogl_renderer, &internal_error))
goto error;
CLUTTER_NOTE (BACKEND, "Creating Cogl swap chain");
swap_chain = cogl_swap_chain_new ();
CLUTTER_NOTE (BACKEND, "Creating Cogl display");
if (klass->get_display != NULL)
{
backend->cogl_display = klass->get_display (backend,
backend->cogl_renderer,
swap_chain,
&internal_error);
}
else
{
CoglOnscreenTemplate *tmpl;
gboolean res;
tmpl = cogl_onscreen_template_new (swap_chain);
/* XXX: I have some doubts that this is a good design.
*
* Conceptually should we be able to check an onscreen_template
* without more details about the CoglDisplay configuration?
*/
res = cogl_renderer_check_onscreen_template (backend->cogl_renderer,
tmpl,
&internal_error);
if (!res)
goto error;
backend->cogl_display = cogl_display_new (backend->cogl_renderer, tmpl);
/* the display owns the template */
cogl_object_unref (tmpl);
}
if (backend->cogl_display == NULL)
goto error;
#ifdef HAVE_CLUTTER_WAYLAND_COMPOSITOR
cogl_wayland_display_set_compositor_display (backend->cogl_display,
_wayland_compositor_display);
#endif
CLUTTER_NOTE (BACKEND, "Setting up the display");
if (!cogl_display_setup (backend->cogl_display, &internal_error))
goto error;
CLUTTER_NOTE (BACKEND, "Creating the Cogl context");
backend->cogl_context = cogl_context_new (backend->cogl_display, &internal_error);
if (backend->cogl_context == NULL)
goto error;
backend->cogl_source = cogl_glib_source_new (backend->cogl_context,
G_PRIORITY_DEFAULT);
g_source_attach (backend->cogl_source, NULL);
/* the display owns the renderer and the swap chain */
cogl_object_unref (backend->cogl_renderer);
cogl_object_unref (swap_chain);
return TRUE;
error:
if (backend->cogl_display != NULL)
{
cogl_object_unref (backend->cogl_display);
backend->cogl_display = NULL;
}
if (backend->cogl_renderer != NULL)
{
cogl_object_unref (backend->cogl_renderer);
backend->cogl_renderer = NULL;
}
if (swap_chain != NULL)
cogl_object_unref (swap_chain);
if (internal_error != NULL)
g_propagate_error (error, internal_error);
else
g_set_error_literal (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
_("Unable to initialize the Clutter backend"));
return FALSE;
}