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framedataholder.h
Go to the documentation of this file.00001 /* 00002 Copyright (C) 2004 by Jorrit Tyberghein 00003 (C) 2004 by Frank Richter 00004 00005 This library is free software; you can redistribute it and/or 00006 modify it under the terms of the GNU Library General Public 00007 License as published by the Free Software Foundation; either 00008 version 2 of the License, or (at your option) any later version. 00009 00010 This library is distributed in the hope that it will be useful, 00011 but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00013 Library General Public License for more details. 00014 00015 You should have received a copy of the GNU Library General Public 00016 License along with this library; if not, write to the Free 00017 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00018 */ 00019 00020 #ifndef __CS_CSTOOL_FRAMEDATAHOLDER_H__ 00021 #define __CS_CSTOOL_FRAMEDATAHOLDER_H__ 00022 00028 #include "csutil/array.h" 00029 00036 template <class T> 00037 class csFrameDataHolder 00038 { 00039 struct FrameData 00040 { 00041 uint lastFrame; 00042 T data; 00043 }; 00044 csArray<FrameData> data; 00045 size_t lastData; 00046 uint nextShrink; 00047 uint lastFrame, clearReq; 00048 public: 00049 csFrameDataHolder () : lastData(0), nextShrink(0), lastFrame((uint)~0), clearReq((uint)~0) 00050 { } 00051 ~csFrameDataHolder () { } 00052 00060 T& GetUnusedData (bool& created, uint frameNumber) 00061 { 00062 if ((clearReq != (uint)~0) && (clearReq != frameNumber)) 00063 data.DeleteAll(); 00064 lastFrame = frameNumber; 00065 created = false; 00066 if ((data.GetSize() == 0) || (data[lastData].lastFrame == frameNumber)) 00067 { 00068 lastData = (size_t)-1; 00069 //check the list 00070 size_t i; 00071 for(i = 0; i < data.GetSize (); i++) 00072 { 00073 if (data[i].lastFrame != frameNumber) 00074 { 00075 lastData = i; 00076 break; 00077 } 00078 } 00079 if (lastData == (size_t)-1) 00080 { 00081 data.SetSize ((lastData = data.GetSize ()) + 1); 00082 created = true; 00083 nextShrink = frameNumber + 1; 00084 } 00085 } 00086 00087 // Conserve some memory 00088 if (!created && (frameNumber <= nextShrink)) 00089 { 00090 data.ShrinkBestFit (); 00091 } 00092 00093 FrameData& frameData = data[lastData]; 00094 frameData.lastFrame = frameNumber; 00095 return frameData.data; 00096 } 00097 00107 void Clear (bool instaClear = false) 00108 { 00109 if (instaClear) 00110 data.DeleteAll(); 00111 else 00112 // Don't clear just yet, rather, clear when we enter the next frame. 00113 clearReq = lastFrame; 00114 } 00115 }; 00116 00117 #endif // __CS_CSTOOL_FRAMEDATAHOLDER_H__
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