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source: GTP/trunk/App/Demos/Geom/OgreStuff/include/OgreRoot.h @ 1092

Revision 1092, 30.8 KB checked in by gumbau, 18 years ago (diff)
LodStrips? and LODTrees demos

Line
1	/*
2	-----------------------------------------------------------------------------
3	This source file is part of OGRE
4	(Object-oriented Graphics Rendering Engine)
5	For the latest info, see http://www.ogre3d.org/
6
7	Copyright (c) 2000-2005 The OGRE Team
8	Also see acknowledgements in Readme.html
9
10	This program is free software; you can redistribute it and/or modify it under
11	the terms of the GNU Lesser General Public License as published by the Free Software
12	Foundation; either version 2 of the License, or (at your option) any later
13	version.
14
15	This program is distributed in the hope that it will be useful, but WITHOUT
16	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
18
19	You should have received a copy of the GNU Lesser General Public License along with
20	this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21	Place - Suite 330, Boston, MA 02111-1307, USA, or go to
22	http://www.gnu.org/copyleft/lesser.txt.
23	-----------------------------------------------------------------------------
24	*/
25	#ifndef __ROOT__
26	#define __ROOT__
27
28	// Precompiler options
29	#include "OgrePrerequisites.h"
30
31	#include "OgreSingleton.h"
32	#include "OgreString.h"
33	#include "OgreSceneManagerEnumerator.h"
34	#include "OgreResourceGroupManager.h"
35
36	#include <exception>
37
38	#if OGRE_COMPILER == OGRE_COMPILER_MSVC \|\| OGRE_COMPILER == OGRE_COMPILER_BORL
39	# define SET_TERM_HANDLER { set_terminate( &Ogre::Root::termHandler ); }
40	#else
41	# define SET_TERM_HANDLER { std::set_terminate( &Ogre::Root::termHandler ); }
42	#endif
43
44	namespace Ogre
45	{
46	typedef std::vector<RenderSystem*> RenderSystemList;
47
48	/** The root class of the Ogre system.
49	@remarks
50	The Ogre::Root class represents a starting point for the client
51	application. From here, the application can gain access to the
52	fundamentals of the system, namely the rendering systems
53	available, management of saved configurations, logging, and
54	access to other classes in the system. Acts as a hub from which
55	all other objects may be reached. An instance of Root must be
56	created before any other Ogre operations are called. Once an
57	instance has been created, the same instance is accessible
58	throughout the life of that object by using Root::getSingleton
59	(as a reference) or Root::getSingletonPtr (as a pointer).
60	*/
61	class _OgreExport Root : public Singleton<Root>
62	{
63	// To allow update of active renderer if
64	// RenderSystem::initialise is used directly
65	friend class RenderSystem;
66	private:
67	RenderSystemList mRenderers;
68	RenderSystem* mActiveRenderer;
69	String mVersion;
70	String mConfigFileName;
71	bool mQueuedEnd;
72	// In case multiple render windows are created, only once are the resources loaded.
73	bool mFirstTimePostWindowInit;
74
75	// Singletons
76	LogManager* mLogManager;
77	ControllerManager* mControllerManager;
78	SceneManagerEnumerator* mSceneManagerEnum;
79	SceneManager* mCurrentSceneManager;
80	DynLibManager* mDynLibManager;
81	PlatformManager* mPlatformManager;
82	ArchiveManager* mArchiveManager;
83	MaterialManager* mMaterialManager;
84	MeshManager* mMeshManager;
85	ParticleSystemManager* mParticleManager;
86	SkeletonManager* mSkeletonManager;
87	OverlayElementFactory* mPanelFactory;
88	OverlayElementFactory* mBorderPanelFactory;
89	OverlayElementFactory* mTextAreaFactory;
90	OverlayManager* mOverlayManager;
91	FontManager* mFontManager;
92	ArchiveFactory *mZipArchiveFactory;
93	ArchiveFactory *mFileSystemArchiveFactory;
94	ResourceGroupManager* mResourceGroupManager;
95	ResourceBackgroundQueue* mResourceBackgroundQueue;
96
97	Timer* mTimer;
98	RenderWindow* mAutoWindow;
99	Profiler* mProfiler;
100	HighLevelGpuProgramManager* mHighLevelGpuProgramManager;
101	ExternalTextureSourceManager* mExternalTextureSourceManager;
102	unsigned long mCurrentFrame;
103
104	std::vector<DynLib*> mPluginLibs;
105	/** Method reads a plugins configuration file and instantiates all
106	plugins.
107	@param
108	pluginsfile The file that contains plugins information.
109	Defaults to "plugins.cfg".
110	*/
111	void loadPlugins( const String& pluginsfile = "plugins.cfg" );
112	/** Shuts down all loaded plugins - allows things to be tidied up whilst
113	all plugins are still loaded.
114	*/
115	void shutdownPlugins();
116
117	/** Unloads all loaded plugins.
118	*/
119	void unloadPlugins();
120
121	// Internal method for one-time tasks after first window creation
122	void oneTimePostWindowInit(void);
123
124	/** Set of registered frame listeners */
125	std::set<FrameListener*> mFrameListeners;
126
127	/** Set of frame listeners marked for removal*/
128	std::set<FrameListener*> mRemovedFrameListeners;
129
130	/** Indicates the type of event to be considered by calculateEventTime(). */
131	enum FrameEventTimeType {
132	FETT_ANY, FETT_STARTED, FETT_ENDED
133	};
134
135	/// Contains the times of recently fired events
136	std::deque<unsigned long> mEventTimes[3];
137
138	/** Internal method for calculating the average time between recently fired events.
139	@param now The current time in ms.
140	@param type The type of event to be considered.
141	*/
142	Real calculateEventTime(unsigned long now, FrameEventTimeType type);
143	public:
144
145	static void termHandler();
146
147	/** Constructor
148	@param
149	pluginFileName The file that contains plugins information.
150	Defaults to "plugins.cfg".
151	*/
152	Root(const String& pluginFileName = "plugins.cfg", const String& configFileName = "ogre.cfg", const String& logFileName = "Ogre.log");
153	~Root();
154
155	/** Saves the details of the current configuration
156	@remarks
157	Stores details of the current configuration so it may be
158	restored later on.
159	*/
160	void saveConfig(void);
161
162	/** Checks for saved video/sound/etc settings
163	@remarks
164	This method checks to see if there is a valid saved configuration
165	from a previous run. If there is, the state of the system will
166	be restored to that configuration.
167
168	@returns
169	If a valid configuration was found, <b>true</b> is returned.
170	@par
171	If there is no saved configuration, or if the system failed
172	with the last config settings, <b>false</b> is returned.
173	*/
174	bool restoreConfig(void);
175
176	/** Displays a dialog asking the user to choose system settings.
177	@remarks
178	This method displays the default dialog allowing the user to
179	choose the renderering system, video mode etc. If there is are
180	any settings saved already, they will be restored automatically
181	before displaying the dialogue. When the user accepts a group of
182	settings, this will automatically call Root::setRenderSystem,
183	RenderSystem::setConfigOption and Root::saveConfig with the
184	user's choices. This is the easiest way to get the system
185	configured.
186	@returns
187	If the user clicked 'Ok', <b>true</b> is returned.
188	@par
189	If they clicked 'Cancel' (in which case the app should
190	strongly consider terminating), <b>false</b> is returned.
191	*/
192	bool showConfigDialog(void);
193
194	/** Adds a new rendering subsystem to the list of available renderers.
195	@remarks
196	Intended for use by advanced users and plugin writers only!
197	Calling this method with a pointer to a valid RenderSystem
198	(sublcass) adds a rendering API implementation to the list of
199	available ones. Typical examples would be an OpenGL
200	implementation and a Direct3D implementation.
201	@note
202	<br>This should usually be called from the dllStartPlugin()
203	function of an extension plug-in.
204	*/
205	void addRenderSystem(RenderSystem* newRend);
206
207	/** Sets the passed in SceneManager to be the one responsible for
208	the indicated type of scene.
209	@remarks
210	This method is provided for application writers and plugin
211	authors to use to attach their SceneManager subclasses to the
212	engine. See the SceneManager class for more information.
213	*/
214	void setSceneManager(SceneType sType, SceneManager* sm);
215
216	/** Retrieve a list of the available render systems.
217	@remarks
218	Retrieves a pointer to the list of available renderers as a
219	list of RenderSystem subclasses. Can be used to build a
220	custom settings dialog.
221	*/
222	RenderSystemList* getAvailableRenderers(void);
223
224	/** Sets the rendering subsystem to be used.
225	@remarks
226	This method indicates to OGRE which rendering system is to be
227	used (e.g. Direct3D, OpenGL etc). This is called
228	automatically by the default config dialog, and when settings
229	are restored from a previous configuraion. If used manually
230	it could be used to set the renderer from a custom settings
231	dialog. Once this has been done, the renderer can be
232	initialised using Root::initialise.
233	@par
234	This method is also called by render systems if they are
235	initialised directly.
236	@param
237	system Pointer to the render system to use.
238	@see
239	RenderSystem
240	*/
241	void setRenderSystem(RenderSystem* system);
242
243	/** Retrieve a pointer to the currently selected render system.
244	*/
245	RenderSystem* getRenderSystem(void);
246
247	/** Initialises the renderer.
248	@remarks
249	This method can only be called after a renderer has been
250	selected with Root::setRenderSystem, and it will initialise
251	the selected rendering system ready for use.
252	@param
253	autoCreateWindow If true, a rendering window will
254	automatically be created (saving a call to
255	RenderSystem::createRenderWindow). The window will be
256	created based on the options currently set on the render
257	system.
258	@returns
259	A pointer to the automatically created window, if
260	requested, otherwise <b>NULL</b>.
261	*/
262	RenderWindow* initialise(bool autoCreateWindow, const String& windowTitle = "OGRE Render Window");
263
264	/** Gets a reference to a SceneManager object.
265	@remarks
266	The SceneManager class (and any subclasses) is a key class
267	which controls the contents of the scene, and is responsible
268	for issuing rendering commands to the RenderSystem to draw
269	it. The SceneManager is the class which an application using
270	Ogre will interact with most, since controlling the contents
271	of the scene is the most frequent action of an application.
272	@par
273	As described in the SceneManager documentation, different
274	subclasses can be specialised for rendering particular types
275	of scene e.g. landscapes or indoor enviroments.
276	@note
277	<br>This function delegates it's implementation to the
278	SceneManagerEnumerator class. This class can be customised to
279	include new SceneType entries and to create new subclasses of
280	SceneManager if they are introduced. This is done because the
281	customisation of the Root class is strongly discouraged and
282	in the future it may be locked down.
283	@param
284	sceneType A value from the SceneType enumeration. The method
285	will return a SceneManager which is most appropriate for this
286	type of scene.
287	@see
288	SceneManager, SceneManagerEnumerator
289	*/
290	SceneManager* getSceneManager(SceneType sceneType);
291
292	/** Retrieves a reference to the current TextureManager.
293	@remarks
294	This performs the same function as
295	TextureManager::getSingleton, but is provided for convenience
296	particularly to scripting engines.
297	@par
298	Note that a TextureManager will NOT be available until the
299	Ogre system has been initialised by selecting a RenderSystem,
300	calling Root::initialise and a window having been created
301	(this may have been done by initialise if required). This is
302	because the exact runtime subclass which will be implementing
303	the calls will differ depending on the rendering engine
304	selected, and these typically require a window upon which to
305	base texture format decisions.
306	*/
307	TextureManager* getTextureManager(void);
308
309	/** Retrieves a reference to the current MeshManager.
310	@remarks
311	This performs the same function as MeshManager::getSingleton
312	and is provided for convenience to scripting engines.
313	*/
314	MeshManager* getMeshManager(void);
315
316	/** Utility function for getting a better description of an error
317	code.
318	*/
319	String getErrorDescription(long errorNumber);
320
321	/** Registers a FrameListener which will be called back every frame.
322	@remarks
323	A FrameListener is a class which implements methods which
324	will be called every frame.
325	@par
326	See the FrameListener class for more details on the specifics
327	It is imperitive that the instance passed to this method is
328	not destroyed before either the rendering loop ends, or the
329	class is removed from the listening list using
330	removeFrameListener.
331	@note
332	<br>This method can only be called after Root::initialise has
333	been called.
334	@see
335	FrameListener, Root::removeFrameListener
336	*/
337	void addFrameListener(FrameListener* newListener);
338
339	/** Removes a FrameListener from the list of listening classes.
340	@see
341	FrameListener, Root::addFrameListener
342	*/
343	void removeFrameListener(FrameListener* oldListener);
344
345	/** Queues the end of rendering.
346	@remarks
347	This method will do nothing unless startRendering() has
348	been called, in which case before the next frame is rendered
349	the rendering loop will bail out.
350	@see
351	Root, Root::startRendering
352	*/
353	void queueEndRendering(void);
354
355	/** Starts / restarts the automatic rendering cycle.
356	@remarks
357	This method begins the automatic rendering of the scene. It
358	will <b>NOT</b> return until the rendering cycle is halted.
359	@par
360	During rendering, any FrameListener classes registered using
361	addFrameListener will be called back for each frame that is
362	to be rendered, These classes can tell OGRE to halt the
363	rendering if required, which will cause this method to
364	return.
365	@note
366	<br>Users of the OGRE library do not have to use this
367	automatic rendering loop. It is there as a convenience and is
368	most useful for high frame rate applications e.g. games. For
369	applications that don't need to constantly refresh the
370	rendering targets (e.g. an editor utility), it is better to
371	manually refresh each render target only when required by
372	calling RenderTarget::update.
373	@note
374	This frees up the CPU to do other things in between
375	refreshes, since in this case frame rate is less important.
376	@note
377	This method can only be called after Root::initialise has
378	been called.
379	*/
380	void startRendering(void);
381
382	/** Render one frame.
383	@remarks
384	Updates all the render targets automatically and then returns,
385	raising frame events before and after.
386	*/
387	bool renderOneFrame(void);
388	/** Shuts down the system manually.
389	@remarks
390	This is normally done by Ogre automatically so don't think
391	you have to call this yourself. However this is here for
392	convenience, especially for dealing with unexpected errors or
393	for systems which need to shut down Ogre on demand.
394	*/
395	void shutdown(void);
396
397	/** Adds a location to the list of searchable locations for a
398	Resource type.
399	@remarks
400	Resource files (textures, models etc) need to be loaded from
401	specific locations. By calling this method, you add another
402	search location to the list. Locations added first are preferred
403	over locations added later.
404	@par
405	Locations can be folders, compressed archives, even perhaps
406	remote locations. Facilities for loading from different
407	locations are provided by plugins which provide
408	implementations of the Archive class.
409	All the application user has to do is specify a 'loctype'
410	string in order to indicate the type of location, which
411	should map onto one of the provided plugins. Ogre comes
412	configured with the 'FileSystem' (folders) and 'Zip' (archive
413	compressed with the pkzip / WinZip etc utilities) types.
414	@par
415	You can also supply the name of a resource group which should
416	have this location applied to it. The
417	ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME group is the
418	default, and one resource group which will always exist. You
419	should consider defining resource groups for your more specific
420	resources (e.g. per level) so that you can control loading /
421	unloading better.
422	@param
423	name The name of the location, e.g. './data' or
424	'/compressed/gamedata.zip'
425	@param
426	locType A string identifying the location type, e.g.
427	'FileSystem' (for folders), 'Zip' etc. Must map to a
428	registered plugin which deals with this type (FileSystem and
429	Zip should always be available)
430	@param
431	groupName Type of name of the resource group which this location
432	should apply to; defaults to the General group which applies to
433	all non-specific resources.
434	@param
435	recursive If the resource location has a concept of recursive
436	directory traversal, enabling this option will mean you can load
437	resources in subdirectories using only their unqualified name.
438	The default is to disable this so that resources in subdirectories
439	with the same name are still unique.
440	@see
441	Archive
442	*/
443	void addResourceLocation(const String& name, const String& locType,
444	const String& groupName = ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,
445	bool recursive = false);
446
447	/** Removes a resource location from the list.
448	@see addResourceLocation
449	@param name The name of the resource location as specified in addResourceLocation
450	@param groupName The name of the resource group to which this location
451	was assigned.
452	*/
453	void removeResourceLocation(const String& name,
454	const String& groupName = ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
455
456	/** Generates a packed data version of the passed in ColourValue suitable for
457	use with the current RenderSystem.
458	@remarks
459	Since different render systems have different colour data formats (eg
460	RGBA for GL, ARGB for D3D) this method allows you to use 1 method for all.
461	@param colour The colour to convert
462	@param pDest Pointer to location to put the result.
463	*/
464	void convertColourValue(const ColourValue& colour, uint32* pDest);
465
466	/** Retrieves a pointer to the window that was created automatically
467	@remarks
468	When Root is initialised an optional window is created. This
469	method retreives a pointer to that window.
470	@note
471	returns a null pointer when Root has not been initialised with
472	the option of creating a window.
473	*/
474	RenderWindow* getAutoCreatedWindow(void);
475
476	/** @copydoc RenderSystem::createRenderWindow
477	*/
478	RenderWindow* createRenderWindow(const String &name, unsigned int width, unsigned int height,
479	bool fullScreen, const NameValuePairList *miscParams = 0) ;
480
481	/** Destroys a rendering window.
482	*/
483	void detachRenderTarget( RenderTarget* pWin );
484
485	/** Destroys a named rendering window.
486	*/
487	void detachRenderTarget( const String & name );
488
489	/** Retrieves a pointer to the a named render window.
490	*/
491	RenderTarget * getRenderTarget(const String &name);
492
493	/** Sets whether or not the debug overlay is shown.
494	@remarks
495	The debug overlay displays frame rate stats and various other debug
496	information. You can enable it or disable it using this method.
497	Alternatively you could access the overlay directly using mSceneManager::getOverlay
498	but this is simpler.
499	void showDebugOverlay(bool show);
500	*/
501
502	/** Manually load a plugin.
503	@remarks
504	Plugins are loaded at startup using the plugin configuration
505	file specified when you create Root (default: plugins.cfg).
506	This method allows you to load plugins in code.
507	@param pluginName Name of the plugin library to load
508	*/
509	void loadPlugin(const String& pluginName);
510
511	/** Manually unloads a plugin.
512	@remarks
513	Plugins are unloaded at shutdown automatically.
514	This method allows you to unload plugins in code, but
515	make sure their dependencies are decoupled frist.
516	@param pluginName Name of the plugin library to unload
517	*/
518	void unloadPlugin(const String& pluginName);
519
520	/** Gets a pointer to the central timer used for all OGRE timings */
521	Timer* getTimer(void);
522
523	/** Method for raising frame started events.
524	@remarks
525	This method is only for internal use when you use OGRE's inbuilt rendering
526	loop (Root::startRendering). However, if you run your own rendering loop then
527	you should call this method to ensure that FrameListener objects are notified
528	of frame events; processes like texture animation and particle systems rely on
529	this.
530	@par
531	Calling this method also increments the frame number, which is
532	important for keeping some elements of the engine up to date.
533	@note
534	This method takes an event object as a parameter, so you can specify the times
535	yourself. If you are happy for OGRE to automatically calculate the frame time
536	for you, then call the other version of this method with no parameters.
537	@param evt Event object which includes all the timing information which you have
538	calculated for yourself
539	@returns False if one or more frame listeners elected that the rendering loop should
540	be terminated, true otherwise.
541	*/
542	bool _fireFrameStarted(FrameEvent& evt);
543	/** Method for raising frame ended events.
544	@remarks
545	This method is only for internal use when you use OGRE's inbuilt rendering
546	loop (Root::startRendering). However, if you run your own rendering loop then
547	you should call this method to ensure that FrameListener objects are notified
548	of frame events; processes like texture animation and particle systems rely on
549	this.
550	@note
551	This method takes an event object as a parameter, so you can specify the times
552	yourself. If you are happy for OGRE to automatically calculate the frame time
553	for you, then call the other version of this method with no parameters.
554	@param evt Event object which includes all the timing information which you have
555	calculated for yourself
556	@returns False if one or more frame listeners elected that the rendering loop should
557	be terminated, true otherwise.
558	*/
559	bool _fireFrameEnded(FrameEvent& evt);
560	/** Method for raising frame started events.
561	@remarks
562	This method is only for internal use when you use OGRE's inbuilt rendering
563	loop (Root::startRendering). However, if you run your own rendering loop then
564	you should call this method to ensure that FrameListener objects are notified
565	of frame events; processes like texture animation and particle systems rely on
566	this.
567	@par
568	Calling this method also increments the frame number, which is
569	important for keeping some elements of the engine up to date.
570	@note
571	This method calculates the frame timing information for you based on the elapsed
572	time. If you want to specify elapsed times yourself you should call the other
573	version of this method which takes event details as a parameter.
574	@returns False if one or more frame listeners elected that the rendering loop should
575	be terminated, true otherwise.
576	*/
577	bool _fireFrameStarted();
578	/** Method for raising frame ended events.
579	@remarks
580	This method is only for internal use when you use OGRE's inbuilt rendering
581	loop (Root::startRendering). However, if you run your own rendering loop then
582	you should call this method to ensure that FrameListener objects are notified
583	of frame events; processes like texture animation and particle systems rely on
584	this.
585	@note
586	This method calculates the frame timing information for you based on the elapsed
587	time. If you want to specify elapsed times yourself you should call the other
588	version of this method which takes event details as a parameter.
589	@returns False if one or more frame listeners elected that the rendering loop should
590	be terminated, true otherwise.
591	*/
592	bool _fireFrameEnded();
593
594	/** Gets the number of the current frame. */
595	unsigned long getCurrentFrameNumber(void) const { return mCurrentFrame; }
596
597	/** Returns the scene manager currently being used to render a frame.
598	@remarks
599	This is only intended for internal use; it is only valid during the
600	rendering of a frame.
601	*/
602	SceneManager* _getCurrentSceneManager(void) const { return mCurrentSceneManager; }
603	/** Sets the scene manager currently being used to render a frame.
604	@remarks
605	This is only intended for internal use.
606	*/
607	void _setCurrentSceneManager(SceneManager* sm) { mCurrentSceneManager = sm; }
608
609	/** Internal method used for updating all RenderTarget objects (windows,
610	renderable textures etc) which are set to auto-update.
611	@remarks
612	You don't need to use this method if you're using Ogre's own internal
613	rendering loop (Root::startRendering). If you're running your own loop
614	you may wish to call it to update all the render targets which are
615	set to auto update (RenderTarget::setAutoUpdated). You can also update
616	individual RenderTarget instances using their own update() method.
617	*/
618	void _updateAllRenderTargets(void);
619
620	/** Override standard Singleton retrieval.
621	@remarks
622	Why do we do this? Well, it's because the Singleton
623	implementation is in a .h file, which means it gets compiled
624	into anybody who includes it. This is needed for the
625	Singleton template to work, but we actually only want it
626	compiled into the implementation of the class based on the
627	Singleton, not all of them. If we don't change this, we get
628	link errors when trying to use the Singleton-based class from
629	an outside dll.
630	@par
631	This method just delegates to the template version anyway,
632	but the implementation stays in this single compilation unit,
633	preventing link errors.
634	*/
635	static Root& getSingleton(void);
636	/** Override standard Singleton retrieval.
637	@remarks
638	Why do we do this? Well, it's because the Singleton
639	implementation is in a .h file, which means it gets compiled
640	into anybody who includes it. This is needed for the
641	Singleton template to work, but we actually only want it
642	compiled into the implementation of the class based on the
643	Singleton, not all of them. If we don't change this, we get
644	link errors when trying to use the Singleton-based class from
645	an outside dll.
646	@par
647	This method just delegates to the template version anyway,
648	but the implementation stays in this single compilation unit,
649	preventing link errors.
650	*/
651	static Root* getSingletonPtr(void);
652
653	/** Clears the history of all event times.
654	@remarks
655	OGRE stores a history of the last few event times in order to smooth
656	out any inaccuracies and temporary fluctuations. However, if you
657	pause or don't render for a little while this can cause a lurch, so
658	if you're resuming rendering after a break, call this method to reset
659	the stored times
660	*/
661	void clearEventTimes(void);
662
663	};
664	} // Namespace Ogre
665	#endif

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