/indra/newview/VertexCache.h

  1/** 
  2 * @file VertexCache.h
  3 * @brief VertexCache class definition
  4 *
  5 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
  6 * Second Life Viewer Source Code
  7 * Copyright (C) 2010, Linden Research, Inc.
  8 * 
  9 * This library is free software; you can redistribute it and/or
 10 * modify it under the terms of the GNU Lesser General Public
 11 * License as published by the Free Software Foundation;
 12 * version 2.1 of the License only.
 13 * 
 14 * This library is distributed in the hope that it will be useful,
 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 17 * Lesser General Public License for more details.
 18 * 
 19 * You should have received a copy of the GNU Lesser General Public
 20 * License along with this library; if not, write to the Free Software
 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 22 * 
 23 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 24 * $/LicenseInfo$
 25 */
 26
 27  
 28#ifndef VERTEX_CACHE_H
 29
 30#define VERTEX_CACHE_H
 31
 32class VertexCache
 33{
 34	
 35public:
 36	
 37	VertexCache(int size)
 38	{
 39		numEntries = size;
 40		
 41		entries = new int[numEntries];
 42		
 43		for(int i = 0; i < numEntries; i++)
 44			entries[i] = -1;
 45	}
 46		
 47	VertexCache() { VertexCache(16); }
 48	~VertexCache() { delete[] entries; entries = 0; }
 49	
 50	bool InCache(int entry)
 51	{
 52		bool returnVal = false;
 53		for(int i = 0; i < numEntries; i++)
 54		{
 55			if(entries[i] == entry)
 56			{
 57				returnVal = true;
 58				break;
 59			}
 60		}
 61		
 62		return returnVal;
 63	}
 64	
 65	int AddEntry(int entry)
 66	{
 67		int removed;
 68		
 69		removed = entries[numEntries - 1];
 70		
 71		//push everything right one
 72		for(int i = numEntries - 2; i >= 0; i--)
 73		{
 74			entries[i + 1] = entries[i];
 75		}
 76		
 77		entries[0] = entry;
 78		
 79		return removed;
 80	}
 81
 82	void Clear()
 83	{
 84		memset(entries, -1, sizeof(int) * numEntries);
 85	}
 86	
 87	void Copy(VertexCache* inVcache) 
 88	{
 89		for(int i = 0; i < numEntries; i++)
 90		{
 91			inVcache->Set(i, entries[i]);
 92		}
 93	}
 94
 95	int At(int index) { return entries[index]; }
 96	void Set(int index, int value) { entries[index] = value; }
 97
 98private:
 99
100  int *entries;
101  int numEntries;
102
103};
104
105#endif