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rbuflock.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_RBUFLOCK_H__ 00021 #define __CS_CSTOOL_RBUFLOCK_H__ 00022 00027 #include "csutil/ref.h" 00028 #include "ivideo/rndbuf.h" 00029 00035 template <class T> 00036 class csRenderBufferLock 00037 { 00038 csRef<iRenderBuffer> buffer; 00039 csRenderBufferLockType lockType; 00040 bool isLocked; 00041 T* lockBuf; 00042 size_t bufOfs, bufStride; 00043 00044 csRenderBufferLock() {} 00045 public: 00049 csRenderBufferLock (iRenderBuffer* buf, 00050 csRenderBufferLockType lock = CS_BUF_LOCK_NORMAL) : buffer(buf), 00051 lockType(lock), isLocked(false), lockBuf(0), bufOfs(buf->GetOffset()), 00052 bufStride(buf->GetElementDistance()) 00053 { 00054 } 00055 00059 ~csRenderBufferLock() 00060 { 00061 Unlock(); 00062 } 00063 00068 T* Lock () 00069 { 00070 if (!isLocked) 00071 { 00072 lockBuf = (T*)((uint8*)buffer->Lock (lockType) + bufOfs); 00073 isLocked = true; 00074 } 00075 return lockBuf; 00076 } 00077 00079 void Unlock () 00080 { 00081 if (isLocked) 00082 { 00083 buffer->Release(); 00084 isLocked = false; 00085 } 00086 } 00087 00092 operator T* () 00093 { 00094 return Lock(); 00095 } 00096 00098 T& operator [] (size_t n) 00099 { 00100 return Get (n); 00101 } 00102 00104 T& Get (size_t n) 00105 { 00106 return *((T*)((uint8*)Lock() + n * bufStride)); 00107 } 00108 00110 size_t GetSize() const 00111 { 00112 return buffer->GetElementCount(); 00113 } 00114 }; 00115 00116 #endif // __CS_CSTOOL_RBUFLOCK_H__
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