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nux  3.0.0
GlobalGraphicsInitializer.h
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00001 /*
00002  * Copyright 2010 Inalogic® Inc.
00003  *
00004  * This program is free software: you can redistribute it and/or modify it
00005  * under the terms of the GNU Lesser General Public License, as
00006  * published by the  Free Software Foundation; either version 2.1 or 3.0
00007  * of the License.
00008  *
00009  * This program is distributed in the hope that it will be useful, but
00010  * WITHOUT ANY WARRANTY; without even the implied warranties of
00011  * MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
00012  * PURPOSE.  See the applicable version of the GNU Lesser General Public
00013  * License for more details.
00014  *
00015  * You should have received a copy of both the GNU Lesser General Public
00016  * License along with this program. If not, see <http://www.gnu.org/licenses/>
00017  *
00018  * Authored by: Jay Taoko <jaytaoko@inalogic.com>
00019  *
00020  */
00021 
00022 
00023 #ifndef NUXGRAPHICSGLOBALINITIALIZER_H
00024 #define NUXGRAPHICSGLOBALINITIALIZER_H
00025 
00026 #define NUX_GLOBAL_GRAPHICS_OBJECT_INIT_SEQUENCE()          \
00027     NUX_GLOBAL_OBJECT_VARIABLE(RenderingStats);             \
00028     NUX_GLOBAL_OBJECT_VARIABLE(NuxGraphicsResources);
00029 
00030 namespace nux
00031 {
00032 
00033   class NuxGraphicsGlobalSingletonInitializer
00034   {
00035     NUX_DISABLE_OBJECT_COPY(NuxGraphicsGlobalSingletonInitializer);
00036     NuxGraphicsGlobalSingletonInitializer *operator & ();
00037     const NuxGraphicsGlobalSingletonInitializer *operator & () const;
00038 
00039   public:
00040     NuxGraphicsGlobalSingletonInitializer();
00041     ~NuxGraphicsGlobalSingletonInitializer();
00042 
00043     static bool Ready();
00044   private:
00045     static bool m_NuxGraphicsGlobalObjectsReady;
00046 
00047     NUX_GLOBAL_GRAPHICS_OBJECT_INIT_SEQUENCE();
00048   };
00049 
00050 
00051 // Nifty Counter idiom. See http://www-d0.fnal.gov/KAI/doc/tutorials/static_initialization.html
00052   class NuxGraphicsGlobalInitializer
00053   {
00054   public:
00055     NuxGraphicsGlobalInitializer();
00056     ~NuxGraphicsGlobalInitializer();
00057   private:
00058     static int m_Count;
00059   };
00060 
00061 // Every compilation unit that includes this file will have its own instance of sGlobalInitializer. sGlobalInitializer is initialized
00062 // before the main function of the program is called. The first time sGlobalInitializer is initialized, it calls SystemStart() to create
00063 // our global object singleton. In SystemStart() we have a change to create our singletons in any order we like.
00064 // When the program exits, every instance of sGlobalInitializer will be destroyed. The last instance destroyed will call SystemShutdown().
00065 // In SystemShutdown() we can destroy our global objects in any order we like.
00066 
00067   static NuxGraphicsGlobalInitializer sNuxGraphicsGlobalInitializer;
00068 
00069 
00070 }
00071 
00072 #endif // NUXGRAPHICSGLOBALINITIALIZER_H