mutter/clutter/win32/clutter-backend-win32.c

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/* Clutter.
* An OpenGL based 'interactive canvas' library.
* Authored By Matthew Allum <mallum@openedhand.com>
* Copyright (C) 2006-2007 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <windows.h>
#include "clutter-backend-win32.h"
#include "clutter-stage-win32.h"
#include "clutter-win32.h"
#include "clutter-device-manager-win32.h"
#include "clutter-event.h"
#include "clutter-main.h"
#include "clutter-device-manager-private.h"
#include "clutter-debug.h"
#include "clutter-private.h"
#include "clutter-stage-private.h"
#include "cogl/cogl.h"
G_DEFINE_TYPE (ClutterBackendWin32, clutter_backend_win32,
CLUTTER_TYPE_BACKEND);
typedef int (WINAPI * SwapIntervalProc) (int interval);
/* singleton object */
static ClutterBackendWin32 *backend_singleton = NULL;
static gchar *clutter_vblank_name = NULL;
static HINSTANCE clutter_hinst = NULL;
/* various flags corresponding to pre init setup calls */
static gboolean _no_event_retrieval = FALSE;
G_CONST_RETURN gchar *
_clutter_backend_win32_get_vblank (void)
{
if (clutter_vblank_name && strcmp (clutter_vblank_name, "0") == 0)
return "none";
else
return clutter_vblank_name;
}
gboolean
clutter_backend_win32_pre_parse (ClutterBackend *backend,
GError **error)
{
const gchar *env_string;
if ((env_string = g_getenv ("CLUTTER_VBLANK")))
clutter_vblank_name = g_strdup (env_string);
return TRUE;
}
static void
clutter_backend_win32_init_events (ClutterBackend *backend)
{
ClutterBackendWin32 *backend_win32 = CLUTTER_BACKEND_WIN32 (backend);
CLUTTER_NOTE (EVENT, "initialising the event loop");
backend_win32->device_manager =
g_object_new (CLUTTER_TYPE_DEVICE_MANAGER_WIN32,
"backend", backend_win32,
NULL);
if (!_no_event_retrieval)
_clutter_backend_win32_events_init (backend);
}
HCURSOR
_clutter_backend_win32_get_invisible_cursor (ClutterBackend *backend)
{
ClutterBackendWin32 *backend_win32 = CLUTTER_BACKEND_WIN32 (backend);
if (backend_win32->invisible_cursor == NULL)
backend_win32->invisible_cursor =
LoadCursor (clutter_hinst, MAKEINTRESOURCE (42));
return backend_win32->invisible_cursor;
}
static const GOptionEntry entries[] =
{
{
"vblank", 0,
0,
G_OPTION_ARG_STRING, &clutter_vblank_name,
"VBlank method to be used (none, default or wgl)", "METHOD"
},
{ NULL }
};
void
clutter_backend_win32_add_options (ClutterBackend *backend,
GOptionGroup *group)
{
g_option_group_add_entries (group, entries);
}
static void
clutter_backend_win32_finalize (GObject *gobject)
{
backend_singleton = NULL;
timeEndPeriod (1);
G_OBJECT_CLASS (clutter_backend_win32_parent_class)->finalize (gobject);
}
static void
clutter_backend_win32_dispose (GObject *gobject)
{
ClutterBackend *backend = CLUTTER_BACKEND (gobject);
ClutterBackendWin32 *backend_win32 = CLUTTER_BACKEND_WIN32 (gobject);
ClutterStageManager *stage_manager;
CLUTTER_NOTE (BACKEND, "Disposing the of stages");
stage_manager = clutter_stage_manager_get_default ();
g_object_unref (stage_manager);
CLUTTER_NOTE (BACKEND, "Removing the event source");
_clutter_backend_win32_events_uninit (CLUTTER_BACKEND (backend_win32));
/* Unrealize all shaders, since the GL context is going away */
_clutter_shader_release_all ();
G_OBJECT_CLASS (clutter_backend_win32_parent_class)->dispose (gobject);
if (backend->cogl_context)
{
cogl_object_unref (backend->cogl_context);
backend->cogl_context = NULL;
}
}
static GObject *
clutter_backend_win32_constructor (GType gtype,
guint n_params,
GObjectConstructParam *params)
{
GObjectClass *parent_class;
GObject *retval;
if (!backend_singleton)
{
parent_class = G_OBJECT_CLASS (clutter_backend_win32_parent_class);
retval = parent_class->constructor (gtype, n_params, params);
backend_singleton = CLUTTER_BACKEND_WIN32 (retval);
return retval;
}
g_warning ("Attempting to create a new backend object. This should "
"never happen, so we return the singleton instance.");
return g_object_ref (backend_singleton);
}
ClutterFeatureFlags
clutter_backend_win32_get_features (ClutterBackend *backend)
{
ClutterBackendClass *parent_class;
ClutterFeatureFlags flags;
parent_class = CLUTTER_BACKEND_CLASS (clutter_backend_win32_parent_class);
flags = CLUTTER_FEATURE_STAGE_USER_RESIZE | CLUTTER_FEATURE_STAGE_CURSOR;
if (cogl_clutter_winsys_has_feature (COGL_WINSYS_FEATURE_MULTIPLE_ONSCREEN))
{
CLUTTER_NOTE (BACKEND, "Cogl supports multiple onscreen framebuffers");
flags |= CLUTTER_FEATURE_STAGE_MULTIPLE;
}
else
{
CLUTTER_NOTE (BACKEND, "Cogl only supports one onscreen framebuffer");
flags |= CLUTTER_FEATURE_STAGE_STATIC;
}
if (cogl_clutter_winsys_has_feature (COGL_WINSYS_FEATURE_SWAP_THROTTLE))
{
CLUTTER_NOTE (BACKEND, "Cogl supports swap buffers throttling");
flags |= CLUTTER_FEATURE_SYNC_TO_VBLANK;
}
else
CLUTTER_NOTE (BACKEND, "Cogl doesn't support swap buffers throttling");
CLUTTER_NOTE (BACKEND, "backend features checked");
return flags;
}
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;
/* XXX: eventually this should go away but a lot of Cogl code still
* depends on a global default context. */
cogl_set_default_context (backend->cogl_context);
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 void
clutter_backend_win32_ensure_context (ClutterBackend *backend,
ClutterStage *stage)
{
ClutterStageWin32 *stage_win32 =
CLUTTER_STAGE_WIN32 (_clutter_stage_get_window (stage));
cogl_set_framebuffer (COGL_FRAMEBUFFER (stage_win32->onscreen));
}
static ClutterStageWindow *
clutter_backend_win32_create_stage (ClutterBackend *backend,
ClutterStage *wrapper,
GError **error)
{
ClutterBackendWin32 *backend_win32 = CLUTTER_BACKEND_WIN32 (backend);
ClutterStageWin32 *stage_win32;
ClutterStageWindow *stage;
stage = g_object_new (CLUTTER_TYPE_STAGE_WIN32, NULL);
/* copy backend data into the stage */
stage_win32 = CLUTTER_STAGE_WIN32 (stage);
stage_win32->backend = backend_win32;
stage_win32->wrapper = wrapper;
return stage;
}
static ClutterDeviceManager *
clutter_backend_win32_get_device_manager (ClutterBackend *backend)
{
ClutterBackendWin32 *backend_win32 = CLUTTER_BACKEND_WIN32 (backend);
if (G_UNLIKELY (backend_win32->device_manager == NULL))
{
backend_win32->device_manager =
g_object_new (CLUTTER_TYPE_DEVICE_MANAGER_WIN32,
"backend", backend_win32,
NULL);
}
return backend_win32->device_manager;
}
/**
* clutter_win32_disable_event_retrieval
*
* Disables retrieval of Windows messages in the main loop. Use to
* create event-less canvas.
*
* This function can only be called before calling clutter_init().
*
* Since: 0.8
*/
void
clutter_win32_disable_event_retrieval (void)
{
if (_clutter_context_is_initialized ())
{
g_warning ("clutter_win32_disable_event_retrieval() can only be "
"called before clutter_init()");
return;
}
_no_event_retrieval = TRUE;
}
static void
clutter_backend_win32_class_init (ClutterBackendWin32Class *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterBackendClass *backend_class = CLUTTER_BACKEND_CLASS (klass);
gobject_class->constructor = clutter_backend_win32_constructor;
gobject_class->dispose = clutter_backend_win32_dispose;
gobject_class->finalize = clutter_backend_win32_finalize;
backend_class->pre_parse = clutter_backend_win32_pre_parse;
backend_class->init_events = clutter_backend_win32_init_events;
backend_class->create_stage = clutter_backend_win32_create_stage;
backend_class->add_options = clutter_backend_win32_add_options;
backend_class->get_features = clutter_backend_win32_get_features;
backend_class->create_context = clutter_backend_win32_create_context;
backend_class->ensure_context = clutter_backend_win32_ensure_context;
backend_class->get_device_manager = clutter_backend_win32_get_device_manager;
}
static void
clutter_backend_win32_init (ClutterBackendWin32 *backend_win32)
{
backend_win32->invisible_cursor = NULL;
/* FIXME: get from GetSystemMetric?
clutter_backend_set_double_click_time (backend, 250);
clutter_backend_set_double_click_distance (backend, 5);
clutter_backend_set_resolution (backend, 96.0);
*/
/* Set the maximum precision for Windows time functions. Without
this glib will not be able to sleep accurately enough to give a
reasonable frame rate */
timeBeginPeriod (1);
}
GType
_clutter_backend_impl_get_type (void)
{
return clutter_backend_win32_get_type ();
}
BOOL WINAPI
DllMain (HINSTANCE hinst, DWORD reason, LPVOID reserved)
{
if (reason == DLL_PROCESS_ATTACH)
/* Store the module handle so that we can use it to load resources */
clutter_hinst = hinst;
return TRUE;
}