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cstool/rbuflock.h

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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/graph3d.h"
00029 #include "ivideo/rndbuf.h"
00030 
00036 template <class T>
00037 class csRenderBufferLock
00038 {
00039   csRef<iRenderBuffer> buffer;
00040   csRenderBufferLockType lockType;
00041   bool isLocked;
00042   T* lockBuf;
00043   
00044   csRenderBufferLock() {}
00045 public:
00049   csRenderBufferLock (iRenderBuffer* buf, 
00050     csRenderBufferLockType lock = CS_BUF_LOCK_NORMAL) : buffer(buf),
00051     lockType(lock), isLocked(false)
00052   {
00053   }
00054   
00058   ~csRenderBufferLock()
00059   {
00060     Unlock();
00061   }
00062   
00064   T* Lock ()
00065   {
00066     if (!isLocked)
00067     {
00068       lockBuf = (T*)buffer->Lock (lockType);
00069       isLocked = true;
00070     }
00071     return lockBuf;
00072   }
00073   
00075   void Unlock ()
00076   {
00077     if (isLocked)
00078     {
00079       buffer->Release();
00080       isLocked = false;
00081     }
00082   }
00083   
00085   operator T* ()
00086   {
00087     return Lock();
00088   }
00089 
00091   T& operator [] (int n)
00092   {
00093     return *(Lock() + n);
00094   }
00095 
00097   T& Get (int n)
00098   {
00099     return *(Lock() + n);
00100   }
00101 };
00102 
00103 #endif // __CS_CSTOOL_RBUFLOCK_H__

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