cstool/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 00039 template <class T, class TbufferKeeper = csRef<iRenderBuffer> > 00040 class csRenderBufferLock 00041 { 00043 TbufferKeeper buffer; 00045 uint lockState; 00047 T* lockBuf; 00049 size_t bufStride; 00050 #ifdef CS_DEBUG 00051 00052 size_t elements; 00053 #endif 00054 00055 size_t currElement; 00056 00057 enum { LockedFlag = 0x10000, LockTypeMask = 0xffff }; 00058 inline bool IsLocked() { return (lockState & LockedFlag) != 0; } 00059 inline void SetLocked (bool b) 00060 { lockState = b ? (lockState | LockedFlag) : (lockState & ~LockedFlag); } 00061 inline csRenderBufferLockType LockType() 00062 { return (csRenderBufferLockType)(lockState & LockTypeMask); } 00063 00064 csRenderBufferLock() {} 00065 // Copying the locking stuff is somewhat nasty so ... prevent it 00066 csRenderBufferLock (const csRenderBufferLock& other) {} 00067 public: 00071 csRenderBufferLock (iRenderBuffer* buf, 00072 csRenderBufferLockType lock = CS_BUF_LOCK_NORMAL) : buffer(buf), 00073 lockState(lock), lockBuf(0), 00074 bufStride(buf ? buf->GetElementDistance() : 0), 00075 currElement(0) 00076 { 00077 #ifdef CS_DEBUG 00078 elements = buf->GetElementCount(); 00079 #endif 00080 } 00081 00085 ~csRenderBufferLock() 00086 { 00087 Unlock(); 00088 } 00089 00094 T* Lock () 00095 { 00096 CS_ASSERT (buffer != 0); 00097 if (!IsLocked()) 00098 { 00099 lockBuf = 00100 buffer ? ((T*)((uint8*)buffer->Lock (LockType()))) : (T*)-1; 00101 SetLocked (true); 00102 } 00103 return lockBuf; 00104 } 00105 00107 void Unlock () 00108 { 00109 if (IsLocked ()) 00110 { 00111 if (buffer) buffer->Release(); 00112 SetLocked (false); 00113 } 00114 } 00115 00120 operator T* () 00121 { 00122 return Lock(); 00123 } 00124 00126 T& operator*() 00127 { 00128 return Get (currElement); 00129 } 00130 00132 void operator++ () 00133 { 00134 currElement++; 00135 CS_ASSERT(currElement<elements); 00136 } 00137 00139 T& operator [] (size_t n) 00140 { 00141 return Get (n); 00142 } 00143 00145 T& Get (size_t n) 00146 { 00147 CS_ASSERT (n < elements); 00148 return *((T*)((uint8*)Lock() + n * bufStride)); 00149 } 00150 00152 size_t GetSize() const 00153 { 00154 return buffer ? buffer->GetElementCount() : 0; 00155 } 00156 00158 bool IsValid() const { return buffer.IsValid(); } 00159 }; 00160 00161 #endif // __CS_CSTOOL_RBUFLOCK_H__
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