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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/rndbuf.h"
    00029
    00043 template <class T, class TbufferKeeper = iRenderBuffer*>
    00044 class csRenderBufferLock
    00045 {
    00047   TbufferKeeper buffer;
    00049   T* lockBuf;
    00051   size_t bufStride;
    00052 #ifdef CS_DEBUG
    00054   size_t elements;
    00055 #endif
    00057   size_t currElement;
    00058
    00059   typedef csRenderBufferLock<T, TbufferKeeper> LockType;
    00069   struct PointerProxy
    00070   {
    00071   #ifdef CS_DEBUG
    00072     const LockType& parent;
    00073     size_t elemNum;
    00074   #else
    00075     T* p;
    00076   #endif
    00077
    00078     PointerProxy (const LockType& parent, size_t elemNum)
    00079   #ifdef CS_DEBUG
    00080       : parent (parent), elemNum (elemNum)
    00081   #else
    00082       : p (&parent.Get (elemNum))
    00083   #endif
    00084     { }
    00085     T& operator*()
    00086     {
    00087   #ifdef CS_DEBUG
    00088       return parent.Get (elemNum);
    00089   #else
    00090       return *p;
    00091   #endif
    00092     }
    00093     const T& operator*() const
    00094     {
    00095   #ifdef CS_DEBUG
    00096       return parent.Get (elemNum);
    00097   #else
    00098       return *p;
    00099   #endif
    00100     }
    00101   };
    00102
    00103   csRenderBufferLock() {}
    00104   // Copying the locking stuff is somewhat nasty so ... prevent it
    00105   csRenderBufferLock (const csRenderBufferLock& other) {}
    00106
    00108   void Unlock ()
    00109   {
    00110     if (buffer) buffer->Release();
    00111   }
    00112 public:
    00116   csRenderBufferLock (iRenderBuffer* buf,
    00117     csRenderBufferLockType lock = CS_BUF_LOCK_NORMAL) : buffer(buf),
    00118     lockBuf(0), bufStride(buf ? buf->GetElementDistance() : 0),
    00119     currElement(0)
    00120   {
    00121 #ifdef CS_DEBUG
    00122     elements = buf ? buf->GetElementCount() : 0;
    00123 #endif
    00124     CS_ASSERT (buffer != 0);
    00125     lockBuf =
    00126       buffer ? ((T*)((uint8*)buffer->Lock (lock))) : (T*)-1;
    00127   }
    00128
    00132   ~csRenderBufferLock()
    00133   {
    00134     Unlock();
    00135   }
    00136
    00141   T* Lock () const
    00142   {
    00143     return lockBuf;
    00144   }
    00145
    00150   operator T* () const
    00151   {
    00152     return Lock();
    00153   }
    00154
    00156   T& operator*() const
    00157   {
    00158     return Get (currElement);
    00159   }
    00160
    00162   PointerProxy operator++ ()
    00163   {
    00164     currElement++;
    00165     return PointerProxy (*this, currElement);
    00166   }
    00167
    00169   PointerProxy operator++ (int)
    00170   {
    00171     size_t n = currElement;
    00172     currElement++;
    00173     return PointerProxy (*this, n);
    00174   }
    00175
    00177   PointerProxy operator+= (int n)
    00178   {
    00179     currElement += n;
    00180     return PointerProxy (*this, currElement);
    00181   }
    00182
    00184   T& operator [] (size_t n) const
    00185   {
    00186     return Get (n);
    00187   }
    00188
    00190   T& Get (size_t n) const
    00191   {
    00192     CS_ASSERT (n < elements);
    00193     return *((T*)((uint8*)Lock() + n * bufStride));
    00194   }
    00195
    00197   size_t GetSize() const
    00198   {
    00199     return buffer ? buffer->GetElementCount() : 0;
    00200   }
    00201
    00203   bool IsValid() const { return buffer.IsValid(); }
    00204 };
    00205
    00206 #endif // __CS_CSTOOL_RBUFLOCK_H__