372 lines
11 KiB
C
372 lines
11 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-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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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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CLUTTER_NOTE (EVENT, "initialising the event loop");
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_clutter_backend_win32_events_init (backend);
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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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ClutterMainContext *context;
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ClutterStageManager *stage_manager;
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CLUTTER_NOTE (BACKEND, "Disposing the of stages");
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context = clutter_context_get_default ();
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stage_manager = context->stage_manager;
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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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wglDeleteContext (backend_win32->gl_context);
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backend_win32->gl_context = 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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/* FIXME: we really need to check if gl context is set */
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extensions = (const gchar *) glGetString (GL_EXTENSIONS);
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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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CLUTTER_NOTE (BACKEND, "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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return flags;
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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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if (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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ClutterStageWindow *impl;
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impl = _clutter_stage_get_window (stage);
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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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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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if (stage_win32->client_dc)
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SwapBuffers (stage_win32->client_dc);
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}
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static ClutterActor *
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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);
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ClutterStageWin32 *stage_win32;
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ClutterActor *stage;
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CLUTTER_NOTE (BACKEND, "Creating stage of type '%s'",
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g_type_name (CLUTTER_STAGE_TYPE));
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stage = g_object_new (CLUTTER_TYPE_STAGE_WIN32, NULL);
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/* copy backend data into the stage */
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stage_win32 = CLUTTER_STAGE_WIN32 (stage);
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stage_win32->backend = backend_win32;
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stage_win32->wrapper = wrapper;
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return stage;
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}
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static void
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clutter_backend_win32_class_init (ClutterBackendWin32Class *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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ClutterBackendClass *backend_class = CLUTTER_BACKEND_CLASS (klass);
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gobject_class->constructor = clutter_backend_win32_constructor;
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gobject_class->dispose = clutter_backend_win32_dispose;
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gobject_class->finalize = clutter_backend_win32_finalize;
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backend_class->pre_parse = clutter_backend_win32_pre_parse;
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backend_class->init_events = clutter_backend_win32_init_events;
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backend_class->create_stage = clutter_backend_win32_create_stage;
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backend_class->add_options = clutter_backend_win32_add_options;
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backend_class->get_features = clutter_backend_win32_get_features;
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backend_class->redraw = clutter_backend_win32_redraw;
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backend_class->ensure_context = clutter_backend_win32_ensure_context;
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}
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static void
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clutter_backend_win32_init (ClutterBackendWin32 *backend_win32)
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{
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ClutterBackend *backend = CLUTTER_BACKEND (backend_win32);
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backend_win32->gl_context = NULL;
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backend_win32->no_event_retrieval = FALSE;
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/* FIXME: get from GetSystemMetric? */
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clutter_backend_set_double_click_time (backend, 250);
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clutter_backend_set_double_click_distance (backend, 5);
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clutter_backend_set_resolution (backend, 96.0);
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/* Set the maximum precision for Windows time functions. Without
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this glib will not be able to sleep accurately enough to give a
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reasonable frame rate */
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timeBeginPeriod (1);
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}
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GType
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_clutter_backend_impl_get_type (void)
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{
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return clutter_backend_win32_get_type ();
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}
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