TGLSelectBuffer.h

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// @(#)root/gl:$Id$
// Author:  Matevz Tadel, Feb 2007
 
/*************************************************************************
 * Copyright (C) 1995-2004, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT_TGLSelectBuffer
#define ROOT_TGLSelectBuffer
 
#include <Rtypes.h>
 
class TGLSelectRecordBase;
 
#include <vector>
#include <utility>
 
/**************************************************************************/
// TGLSelectBuffer
/**************************************************************************/
 
class TGLSelectBuffer
{
protected:
   Int_t   fBufSize;  // Size of buffer.
   UInt_t* fBuf;      // Actual buffer.
 
   Int_t   fNRecords; // Number of records as returned by glRenderMode.
 
   typedef std::pair<UInt_t, UInt_t*>  RawRecord_t;
   typedef std::vector<RawRecord_t>   vRawRecord_t;
 
   vRawRecord_t fSortedRecords;
 
   static Int_t fgMaxBufSize;
 
public:
   TGLSelectBuffer();
   virtual ~TGLSelectBuffer();
 
   Int_t   GetBufSize()  const { return fBufSize; }
   UInt_t* GetBuf()      const { return fBuf; }
   Int_t   GetNRecords() const { return fNRecords; }
 
   Bool_t CanGrow();
   void   Grow();
 
   void ProcessResult(Int_t glResult);
 
   UInt_t* RawRecord(Int_t i) { return fSortedRecords[i].second; }
 
   Int_t   SelectRecord(TGLSelectRecordBase& rec, Int_t i);
 
   ClassDef(TGLSelectBuffer, 0) // OpenGL select buffer with depth sorting.
};
 
#endif