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

Revision 1092, 9.3 KB checked in by gumbau, 18 years ago (diff)

LodStrips? and LODTrees demos
Line 
1/*
2-----------------------------------------------------------------------------
3This source file is part of OGRE
4    (Object-oriented Graphics Rendering Engine)
5For the latest info, see http://www.ogre3d.org/
6
7Copyright (c) 2000-2005 The OGRE Team
8Also see acknowledgements in Readme.html
9
10This program is free software; you can redistribute it and/or modify it under
11the terms of the GNU Lesser General Public License as published by the Free Software
12Foundation; either version 2 of the License, or (at your option) any later
13version.
14
15This program is distributed in the hope that it will be useful, but WITHOUT
16ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
18
19You should have received a copy of the GNU Lesser General Public License along with
20this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21Place - Suite 330, Boston, MA 02111-1307, USA, or go to
22http://www.gnu.org/copyleft/lesser.txt.
23-----------------------------------------------------------------------------
24*/
25#ifndef __OverlayManager_H__
26#define __OverlayManager_H__
27
28#include "OgrePrerequisites.h"
29#include "OgreSingleton.h"
30#include "OgreStringVector.h"
31#include "OgreOverlay.h"
32#include "OgreScriptLoader.h"
33
34namespace Ogre {
35
36    /** Manages Overlay objects, parsing them from .overlay files and
37        storing a lookup library of them. Alo manages the creation of
38                OverlayContainers and OverlayElements, used for non-interactive 2D
39                elements such as HUDs.
40    */
41    class _OgreExport OverlayManager : public Singleton<OverlayManager>, public ScriptLoader
42    {
43    public:
44        typedef std::map<String, Overlay*> OverlayMap;
45                typedef std::map<String, OverlayElement*> ElementMap;
46    protected:
47        OverlayMap mOverlayMap;
48        StringVector mScriptPatterns;
49
50        void parseNewElement( DataStreamPtr& chunk, String& elemType, String& elemName,
51            bool isContainer, Overlay* pOverlay, bool isTemplate, String templateName = String(""), OverlayContainer* container = 0);
52        void parseAttrib( const String& line, Overlay* pOverlay);
53        void parseElementAttrib( const String& line, Overlay* pOverlay, OverlayElement* pElement );
54        void parseNewMesh(DataStreamPtr& chunk, String& meshName, String& entityName, Overlay* pOverlay);
55        void skipToNextCloseBrace(DataStreamPtr& chunk);
56        void skipToNextOpenBrace(DataStreamPtr& chunk);
57       
58        int mLastViewportWidth, mLastViewportHeight;
59        bool mViewportDimensionsChanged;
60
61            bool parseChildren( DataStreamPtr& chunk, const String& line,
62            Overlay* pOverlay, bool isTemplate, OverlayContainer* parent = NULL);
63
64                typedef std::map<String, OverlayElementFactory*> FactoryMap;
65                FactoryMap mFactories;
66
67                ElementMap mInstances;
68                ElementMap mTemplates;
69
70                typedef std::set<String> LoadedScripts;
71                LoadedScripts mLoadedScripts;
72
73
74
75
76                ElementMap& getElementMap(bool isTemplate);
77
78                OverlayElement* createOverlayElementImpl(const String& typeName, const String& instanceName, ElementMap& elementMap);
79
80                OverlayElement* getOverlayElementImpl(const String& name, ElementMap& elementMap);
81
82                void destroyOverlayElementImpl(const String& instanceName, ElementMap& elementMap);
83
84                void destroyOverlayElementImpl(OverlayElement* pInstance, ElementMap& elementMap);
85
86                void destroyAllOverlayElementsImpl(ElementMap& elementMap);
87
88    public:
89        OverlayManager();
90        virtual ~OverlayManager();
91
92        /// @copydoc ScriptLoader::getScriptPatterns
93        const StringVector& getScriptPatterns(void) const;
94        /// @copydoc ScriptLoader::parseScript
95        void parseScript(DataStreamPtr& stream, const String& groupName);
96        /// @copydoc ScriptLoader::getLoadingOrder
97        Real getLoadingOrder(void) const;
98
99        /** Create a new Overlay. */
100        Overlay* create(const String& name);
101        /** Retrieve an Overlay by name
102        @returns A pointer to the Overlay, or 0 if not found
103        */
104        Overlay* getByName(const String& name);
105        /** Destroys an existing overlay by name */
106        void destroy(const String& name);
107        /** Destroys an existing overlay */
108        void destroy(Overlay* overlay);
109        /** Destroys all existing overlays */
110        void destroyAll(void);
111        typedef MapIterator<OverlayMap> OverlayMapIterator;
112        OverlayMapIterator getOverlayIterator(void);
113
114        /** Internal method for queueing the visible overlays for rendering. */
115        void _queueOverlaysForRendering(Camera* cam, RenderQueue* pQueue, Viewport *vp);
116
117        /** Method for determining if the viewport has changed dimensions.
118        @remarks This is used by pixel-based OverlayElements to work out if they need to
119            reclaculate their sizes.
120        */
121        bool hasViewportChanged(void) const;
122
123        /** Gets the height of the destination viewport in pixels. */
124        int getViewportHeight(void) const;
125       
126        /** Gets the width of the destination viewport in pixels. */
127        int getViewportWidth(void) const;
128        Real getViewportAspectRatio(void) const;
129
130
131                /** Creates a new OverlayElement of the type requested.
132                @remarks
133                The type of element to create is passed in as a string because this
134                allows plugins to register new types of component.
135                @param typeName The type of element to create.
136                @param instanceName The name to give the new instance.
137                */
138                OverlayElement* createOverlayElement(const String& typeName, const String& instanceName, bool isTemplate = false);
139
140                /** Gets a reference to an existing element. */
141                OverlayElement* getOverlayElement(const String& name, bool isTemplate = false);
142
143                /** Destroys a OverlayElement.
144                @remarks
145                Make sure you're not still using this in an Overlay. If in
146                doubt, let OGRE destroy elements on shutdown.
147                */
148                void destroyOverlayElement(const String& instanceName, bool isTemplate = false);
149
150                /** Destroys a OverlayElement.
151                @remarks
152                Make sure you're not still using this in an Overlay. If in
153                doubt, let OGRE destroy elements on shutdown.
154                */
155                void destroyOverlayElement(OverlayElement* pInstance, bool isTemplate = false);
156
157                /** Destroys all the OverlayElement  created so far.
158                @remarks
159                Best to leave this to the engine to call internally, there
160                should rarely be a need to call it yourself.
161                */
162                void destroyAllOverlayElements(bool isTemplate = false);
163
164                /** Registers a new OverlayElementFactory with this manager.
165                @remarks
166                Should be used by plugins or other apps wishing to provide
167                a new OverlayElement subclass.
168                */
169                void addOverlayElementFactory(OverlayElementFactory* elemFactory);
170
171                OverlayElement* createOverlayElementFromTemplate(const String& templateName, const String& typeName, const String& instanceName, bool isTemplate = false);
172                /**
173                *  @remarks
174                *  Creates a new OverlayElement object from the specified template name.  The new
175                *  object's name, and all of it's children, will be instanceName/orignalName.
176                */
177                OverlayElement* cloneOverlayElementFromTemplate(const String& templateName, const String& instanceName);
178
179                OverlayElement* createOverlayElementFromFactory(const String& typeName, const String& instanceName);
180
181                typedef MapIterator<ElementMap> TemplateIterator;
182                /** Returns an iterator over all templates in this manager.*/
183                TemplateIterator getTemplateIterator ()
184                {
185                        return TemplateIterator (mTemplates.begin (), mTemplates.end ()) ;
186                }
187                /* Returns whether the Element with the given name is a Template */
188                bool isTemplate (String strName) const {
189                        return (mTemplates.find (strName) != mTemplates.end()) ;
190                }
191
192
193        /** Override standard Singleton retrieval.
194        @remarks
195        Why do we do this? Well, it's because the Singleton
196        implementation is in a .h file, which means it gets compiled
197        into anybody who includes it. This is needed for the
198        Singleton template to work, but we actually only want it
199        compiled into the implementation of the class based on the
200        Singleton, not all of them. If we don't change this, we get
201        link errors when trying to use the Singleton-based class from
202        an outside dll.
203        @par
204        This method just delegates to the template version anyway,
205        but the implementation stays in this single compilation unit,
206        preventing link errors.
207        */
208        static OverlayManager& getSingleton(void);
209        /** Override standard Singleton retrieval.
210        @remarks
211        Why do we do this? Well, it's because the Singleton
212        implementation is in a .h file, which means it gets compiled
213        into anybody who includes it. This is needed for the
214        Singleton template to work, but we actually only want it
215        compiled into the implementation of the class based on the
216        Singleton, not all of them. If we don't change this, we get
217        link errors when trying to use the Singleton-based class from
218        an outside dll.
219        @par
220        This method just delegates to the template version anyway,
221        but the implementation stays in this single compilation unit,
222        preventing link errors.
223        */
224        static OverlayManager* getSingletonPtr(void);
225    };
226
227
228
229}
230
231
232#endif
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