ae188d203c
The Win32 backend now implements the create_context method which creates a context and binds it to a 1x1 invisible window. That way there will always be a context bound and the features can be retrieved without creating the default stage. This reflects the changes in 1c6ffc8..b245d55 to the GLX backend.
595 lines
17 KiB
C
595 lines
17 KiB
C
/* Clutter.
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* An OpenGL based 'interactive canvas' library.
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* Authored By Matthew Allum <mallum@openedhand.com>
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* Copyright (C) 2006-2007 OpenedHand
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <windows.h>
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#include "clutter-backend-win32.h"
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#include "clutter-stage-win32.h"
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#include "clutter-win32.h"
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#include "../clutter-event.h"
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#include "../clutter-main.h"
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#include "../clutter-input-device.h"
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#include "../clutter-debug.h"
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#include "../clutter-private.h"
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#include "../clutter-version.h"
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#include "cogl/cogl.h"
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G_DEFINE_TYPE (ClutterBackendWin32, clutter_backend_win32,
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CLUTTER_TYPE_BACKEND);
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typedef int (WINAPI * SwapIntervalProc) (int interval);
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/* singleton object */
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static ClutterBackendWin32 *backend_singleton = NULL;
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static gchar *clutter_vblank_name = NULL;
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static HINSTANCE clutter_hinst = NULL;
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gboolean
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clutter_backend_win32_pre_parse (ClutterBackend *backend,
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GError **error)
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{
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const gchar *env_string;
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if ((env_string = g_getenv ("CLUTTER_VBLANK")))
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clutter_vblank_name = g_strdup (env_string);
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return TRUE;
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}
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static void
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clutter_backend_win32_init_events (ClutterBackend *backend)
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{
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ClutterBackendWin32 *backend_win32 = CLUTTER_BACKEND_WIN32 (backend);
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ClutterDeviceManager *manager;
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ClutterInputDevice *device;
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CLUTTER_NOTE (EVENT, "initialising the event loop");
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manager = clutter_device_manager_get_default ();
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device = g_object_new (CLUTTER_TYPE_INPUT_DEVICE,
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"id", 0,
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"name", "Core Pointer",
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"device-type", CLUTTER_POINTER_DEVICE,
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NULL);
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_clutter_device_manager_add_device (manager, device);
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backend_win32->core_pointer = device;
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device = g_object_new (CLUTTER_TYPE_INPUT_DEVICE,
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"id", 1,
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"name", "Core Keyboard",
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"device-type", CLUTTER_KEYBOARD_DEVICE,
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NULL);
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_clutter_device_manager_add_device (manager, device);
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backend_win32->core_keyboard = device;
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_clutter_backend_win32_events_init (backend);
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}
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HCURSOR
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_clutter_backend_win32_get_invisible_cursor (ClutterBackend *backend)
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{
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ClutterBackendWin32 *backend_win32 = CLUTTER_BACKEND_WIN32 (backend);
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if (backend_win32->invisible_cursor == NULL)
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backend_win32->invisible_cursor =
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LoadCursor (clutter_hinst, MAKEINTRESOURCE (42));
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return backend_win32->invisible_cursor;
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}
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static const GOptionEntry entries[] =
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{
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{
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"vblank", 0,
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0,
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G_OPTION_ARG_STRING, &clutter_vblank_name,
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"VBlank method to be used (none, default or wgl)", "METHOD"
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},
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{ NULL }
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};
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void
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clutter_backend_win32_add_options (ClutterBackend *backend,
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GOptionGroup *group)
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{
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g_option_group_add_entries (group, entries);
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}
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static void
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clutter_backend_win32_finalize (GObject *gobject)
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{
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backend_singleton = NULL;
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timeEndPeriod (1);
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G_OBJECT_CLASS (clutter_backend_win32_parent_class)->finalize (gobject);
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}
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static void
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clutter_backend_win32_dispose (GObject *gobject)
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{
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ClutterBackendWin32 *backend_win32 = CLUTTER_BACKEND_WIN32 (gobject);
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ClutterStageManager *stage_manager;
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CLUTTER_NOTE (BACKEND, "Disposing the of stages");
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stage_manager = clutter_stage_manager_get_default ();
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/* Destroy all of the stages. g_slist_foreach is used because the
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finalizer for the stages will remove the stage from the
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stage_manager's list and g_slist_foreach has some basic
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protection against this */
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g_slist_foreach (stage_manager->stages, (GFunc) clutter_actor_destroy, NULL);
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CLUTTER_NOTE (BACKEND, "Removing the event source");
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_clutter_backend_win32_events_uninit (CLUTTER_BACKEND (backend_win32));
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/* Unrealize all shaders, since the GL context is going away */
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_clutter_shader_release_all ();
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if (backend_win32->gl_context)
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{
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wglMakeCurrent (NULL, NULL);
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wglDeleteContext (backend_win32->gl_context);
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backend_win32->gl_context = NULL;
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}
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if (backend_win32->dummy_dc)
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{
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ReleaseDC (backend_win32->dummy_hwnd, backend_win32->dummy_dc);
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backend_win32->dummy_dc = NULL;
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}
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if (backend_win32->dummy_hwnd)
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{
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DestroyWindow (backend_win32->dummy_hwnd);
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backend_win32->dummy_hwnd = NULL;
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}
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G_OBJECT_CLASS (clutter_backend_win32_parent_class)->dispose (gobject);
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}
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static GObject *
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clutter_backend_win32_constructor (GType gtype,
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guint n_params,
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GObjectConstructParam *params)
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{
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GObjectClass *parent_class;
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GObject *retval;
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if (!backend_singleton)
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{
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parent_class = G_OBJECT_CLASS (clutter_backend_win32_parent_class);
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retval = parent_class->constructor (gtype, n_params, params);
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backend_singleton = CLUTTER_BACKEND_WIN32 (retval);
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return retval;
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}
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g_warning ("Attempting to create a new backend object. This should "
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"never happen, so we return the singleton instance.");
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return g_object_ref (backend_singleton);
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}
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static gboolean
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check_vblank_env (const char *name)
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{
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return clutter_vblank_name && !g_ascii_strcasecmp (clutter_vblank_name, name);
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}
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ClutterFeatureFlags
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clutter_backend_win32_get_features (ClutterBackend *backend)
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{
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ClutterFeatureFlags flags;
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const gchar *extensions;
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SwapIntervalProc swap_interval;
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ClutterBackendWin32 *backend_win32;
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/* this will make sure that the GL context exists and is bound to a
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drawable */
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backend_win32 = CLUTTER_BACKEND_WIN32 (backend);
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g_return_val_if_fail (backend_win32->gl_context != NULL, 0);
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g_return_val_if_fail (wglGetCurrentDC () != NULL, 0);
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extensions = (const gchar *) glGetString (GL_EXTENSIONS);
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CLUTTER_NOTE (BACKEND,
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"Checking features\n"
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" GL_VENDOR: %s\n"
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" GL_RENDERER: %s\n"
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" GL_VERSION: %s\n"
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" GL_EXTENSIONS: %s\n",
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glGetString (GL_VENDOR),
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glGetString (GL_RENDERER),
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glGetString (GL_VERSION),
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extensions);
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flags = CLUTTER_FEATURE_STAGE_USER_RESIZE
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| CLUTTER_FEATURE_STAGE_CURSOR
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| CLUTTER_FEATURE_STAGE_MULTIPLE;
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/* If the VBlank should be left at the default or it has been
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disabled elsewhere (eg NVIDIA) then don't bother trying to check
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for the swap control extension */
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if (getenv ("__GL_SYNC_TO_VBLANK") || check_vblank_env ("default"))
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CLUTTER_NOTE (BACKEND, "vblank sync: left at default at user request");
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else if (cogl_check_extension ("WGL_EXT_swap_control", extensions)
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&& (swap_interval = (SwapIntervalProc)
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cogl_get_proc_address ("wglSwapIntervalEXT")))
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{
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/* According to the specification for the WGL_EXT_swap_control
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extension the default swap interval is 1 anyway, so if no
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vblank is requested then we should explicitly set it to
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zero */
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if (check_vblank_env ("none"))
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{
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if (swap_interval (0))
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CLUTTER_NOTE (BACKEND, "vblank sync: successfully disabled");
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else
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CLUTTER_NOTE (BACKEND, "vblank sync: disabling failed");
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}
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else
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{
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if (swap_interval (1))
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{
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flags |= CLUTTER_FEATURE_SYNC_TO_VBLANK;
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CLUTTER_NOTE (BACKEND, "vblank sync: wglSwapIntervalEXT "
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"vblank setup success");
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}
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else
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CLUTTER_NOTE (BACKEND, "vblank sync: wglSwapIntervalEXT "
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"vblank setup failed");
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}
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}
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else
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CLUTTER_NOTE (BACKEND, "no use-able vblank mechanism found");
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CLUTTER_NOTE (BACKEND, "backend features checked");
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return flags;
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}
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static ATOM
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clutter_backend_win32_get_dummy_window_class ()
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{
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static ATOM klass = 0;
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if (klass == 0)
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{
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WNDCLASSW wndclass;
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memset (&wndclass, 0, sizeof (wndclass));
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wndclass.lpfnWndProc = DefWindowProc;
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wndclass.hInstance = GetModuleHandleW (NULL);
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wndclass.lpszClassName = L"ClutterBackendWin32DummyWindow";
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klass = RegisterClassW (&wndclass);
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}
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return klass;
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}
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static gboolean
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clutter_backend_win32_pixel_format_is_better (const PIXELFORMATDESCRIPTOR *pfa,
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const PIXELFORMATDESCRIPTOR *pfb)
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{
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/* Always prefer a format with a stencil buffer */
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if (pfa->cStencilBits == 0)
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{
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if (pfb->cStencilBits > 0)
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return TRUE;
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}
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else if (pfb->cStencilBits == 0)
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return FALSE;
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/* Prefer a bigger color buffer */
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if (pfb->cColorBits > pfa->cColorBits)
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return TRUE;
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else if (pfb->cColorBits < pfa->cColorBits)
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return FALSE;
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/* Prefer a bigger depth buffer */
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return pfb->cDepthBits > pfa->cDepthBits;
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}
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static int
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clutter_backend_win32_choose_pixel_format (HDC dc, PIXELFORMATDESCRIPTOR *pfd)
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{
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int i, num_formats, best_pf = 0;
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PIXELFORMATDESCRIPTOR best_pfd;
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num_formats = DescribePixelFormat (dc, 0, sizeof (best_pfd), NULL);
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for (i = 1; i <= num_formats; i++)
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{
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memset (pfd, 0, sizeof (*pfd));
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if (DescribePixelFormat (dc, i, sizeof (best_pfd), pfd)
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/* Check whether this format is useable by Clutter */
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&& ((pfd->dwFlags & (PFD_SUPPORT_OPENGL
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| PFD_DRAW_TO_WINDOW
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| PFD_DOUBLEBUFFER
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| PFD_GENERIC_FORMAT))
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== (PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER | PFD_DRAW_TO_WINDOW))
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&& pfd->iPixelType == PFD_TYPE_RGBA
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&& pfd->cColorBits >= 16 && pfd->cColorBits <= 32
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&& pfd->cDepthBits >= 16 && pfd->cDepthBits <= 32
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/* Check whether this is a better format than one we've
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already found */
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&& (best_pf == 0
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|| clutter_backend_win32_pixel_format_is_better (&best_pfd, pfd)))
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{
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best_pf = i;
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best_pfd = *pfd;
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}
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}
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*pfd = best_pfd;
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return best_pf;
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}
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static gboolean
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clutter_backend_win32_create_context (ClutterBackend *backend,
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GError **error)
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{
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ClutterBackendWin32 *backend_win32 = CLUTTER_BACKEND_WIN32 (backend);
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/* COGL assumes that there is always a GL context selected; in order
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* to make sure that a WGL context exists and is made current, we
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* use a small dummy window that never gets shown to which we can
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* always fall back if no stage is available
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*/
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if (backend_win32->dummy_hwnd == NULL)
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{
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ATOM window_class = clutter_backend_win32_get_dummy_window_class ();
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if (window_class == 0)
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{
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g_critical ("Unable to register window class");
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return FALSE;
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}
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backend_win32->dummy_hwnd =
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CreateWindowW ((LPWSTR) MAKEINTATOM (window_class),
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L".",
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WS_OVERLAPPEDWINDOW,
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CW_USEDEFAULT,
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CW_USEDEFAULT,
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1, 1,
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NULL, NULL,
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GetModuleHandle (NULL),
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NULL);
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if (backend_win32->dummy_hwnd == NULL)
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{
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g_critical ("Unable to create dummy window");
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return FALSE;
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}
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}
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if (backend_win32->dummy_dc == NULL)
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{
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PIXELFORMATDESCRIPTOR pfd;
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int pf;
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backend_win32->dummy_dc = GetDC (backend_win32->dummy_hwnd);
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pf = clutter_backend_win32_choose_pixel_format (backend_win32->dummy_dc,
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&pfd);
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if (pf == 0 || !SetPixelFormat (backend_win32->dummy_dc, pf, &pfd))
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{
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g_critical ("Unable to find suitable GL pixel format");
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ReleaseDC (backend_win32->dummy_hwnd, backend_win32->dummy_dc);
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backend_win32->dummy_dc = NULL;
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return FALSE;
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}
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}
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if (backend_win32->gl_context == NULL)
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{
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backend_win32->gl_context = wglCreateContext (backend_win32->dummy_dc);
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if (backend_win32->gl_context == NULL)
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{
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g_critical ("Unable to create suitable GL context");
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return FALSE;
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}
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}
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CLUTTER_NOTE (BACKEND, "Selecting dummy 0x%x for the WGL context",
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(unsigned int) backend_win32->dummy_hwnd);
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wglMakeCurrent (backend_win32->dummy_dc, backend_win32->gl_context);
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return TRUE;
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}
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static void
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clutter_backend_win32_ensure_context (ClutterBackend *backend,
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ClutterStage *stage)
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{
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ClutterStageWindow *impl;
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if (stage == NULL ||
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(CLUTTER_PRIVATE_FLAGS (stage) & CLUTTER_ACTOR_IN_DESTRUCTION) ||
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((impl = _clutter_stage_get_window (stage)) == NULL))
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{
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CLUTTER_NOTE (MULTISTAGE, "Clearing all context");
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wglMakeCurrent (NULL, NULL);
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}
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else
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{
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ClutterBackendWin32 *backend_win32;
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ClutterStageWin32 *stage_win32;
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g_return_if_fail (impl != NULL);
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CLUTTER_NOTE (MULTISTAGE, "Setting context for stage of type %s [%p]",
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g_type_name (G_OBJECT_TYPE (impl)),
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impl);
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backend_win32 = CLUTTER_BACKEND_WIN32 (backend);
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stage_win32 = CLUTTER_STAGE_WIN32 (impl);
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/* no GL context to set */
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if (backend_win32->gl_context == NULL)
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return;
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/* we might get here inside the final dispose cycle, so we
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* need to handle this gracefully
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*/
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if (stage_win32->client_dc == NULL)
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{
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CLUTTER_NOTE (MULTISTAGE,
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"Received a stale stage, clearing all context");
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if (backend_win32->dummy_dc != NULL)
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wglMakeCurrent (backend_win32->dummy_dc,
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backend_win32->gl_context);
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else
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wglMakeCurrent (NULL, NULL);
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}
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else
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{
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CLUTTER_NOTE (BACKEND,
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"MakeCurrent window %p (%s), context %p",
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stage_win32->hwnd,
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stage_win32->is_foreign_win ? "foreign" : "native",
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backend_win32->gl_context);
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wglMakeCurrent (stage_win32->client_dc,
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backend_win32->gl_context);
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}
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}
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}
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static void
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clutter_backend_win32_redraw (ClutterBackend *backend,
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ClutterStage *stage)
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{
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ClutterStageWin32 *stage_win32;
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ClutterStageWindow *impl;
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impl = _clutter_stage_get_window (stage);
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if (impl == NULL)
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return;
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g_return_if_fail (CLUTTER_IS_STAGE_WIN32 (impl));
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stage_win32 = CLUTTER_STAGE_WIN32 (impl);
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/* this will cause the stage implementation to be painted */
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clutter_actor_paint (CLUTTER_ACTOR (stage));
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cogl_flush ();
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if (stage_win32->client_dc)
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SwapBuffers (stage_win32->client_dc);
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}
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static ClutterStageWindow *
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clutter_backend_win32_create_stage (ClutterBackend *backend,
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ClutterStage *wrapper,
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GError **error)
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{
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ClutterBackendWin32 *backend_win32 = CLUTTER_BACKEND_WIN32 (backend);
|
|
ClutterStageWin32 *stage_win32;
|
|
ClutterStageWindow *stage;
|
|
|
|
CLUTTER_NOTE (BACKEND, "Creating stage of type '%s'",
|
|
g_type_name (CLUTTER_STAGE_TYPE));
|
|
|
|
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 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->redraw = clutter_backend_win32_redraw;
|
|
backend_class->create_context = clutter_backend_win32_create_context;
|
|
backend_class->ensure_context = clutter_backend_win32_ensure_context;
|
|
}
|
|
|
|
static void
|
|
clutter_backend_win32_init (ClutterBackendWin32 *backend_win32)
|
|
{
|
|
ClutterBackend *backend = CLUTTER_BACKEND (backend_win32);
|
|
|
|
backend_win32->gl_context = NULL;
|
|
backend_win32->no_event_retrieval = FALSE;
|
|
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;
|
|
}
|