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CryEntitySystem/IDGenerator.cpp

@@ -0,0 +1,98 @@
+//////////////////////////////////////////////////////////////////////
+//
+//  Game Source Code
+//
+//  File: IDGenerator.cpp
+//  Description: ID Generator class.
+//
+//  History:
+//  - 08/06/2001: Created by Alberto Demichelis
+//  - 12/03/2003: Martin Mittring made distinction between static and dynamic ids
+//
+//////////////////////////////////////////////////////////////////////
+
+#include "stdafx.h"
+#include "IDGenerator.h"
+
+#ifdef _DEBUG
+static char THIS_FILE[] = __FILE__;
+#define DEBUG_CLIENTBLOCK new( _NORMAL_BLOCK, THIS_FILE, __LINE__) 
+#define new DEBUG_CLIENTBLOCK
+#endif
+
+///////////////////////////////////////////////
+CIDGenerator::CIDGenerator()
+{
+	m_vUsedIDs.resize(0xFFFF+1,false);
+	Reset();
+}
+
+///////////////////////////////////////////////
+CIDGenerator::~CIDGenerator()
+{
+}
+
+///////////////////////////////////////////////
+void CIDGenerator::Reset()
+{
+	BitVectorItor itor=m_vUsedIDs.begin();
+	int nSize=m_vUsedIDs.size();
+	int n=0;
+	while(n<nSize)
+	{
+		m_vUsedIDs[n] = false;
+		n++;
+	}
+	//memset(m_vUsedIDs,0,sizeof(m_vUsedIDs));
+	m_vUsedIDs[0] = true;
+}
+
+
+
+///////////////////////////////////////////////
+WORD CIDGenerator::GetNewDynamic()
+{
+	WORD i = 0xffff;		// to be able to have different ID range for dynamically generated entities
+	
+	while (m_vUsedIDs[i])
+		--i;										// WORD is cycling through the whole buffer
+
+	m_vUsedIDs[i] = true;
+	return i;
+}
+
+bool CIDGenerator::IsDynamicEntityId( WORD nID )
+{
+	return (nID&0x8000)!=0;
+}
+
+///////////////////////////////////////////////
+WORD CIDGenerator::GetNewStatic()
+{
+	WORD i = 0;		// to be able to have different ID range for dynamically generated entities
+	
+	while(m_vUsedIDs[i])
+		++i;										// WORD is cycling through the whole buffer
+
+	m_vUsedIDs[i] = true;
+	return i;
+}
+
+///////////////////////////////////////////////
+void CIDGenerator::Remove(WORD nID)
+{	
+	assert(m_vUsedIDs[nID]==true);
+	m_vUsedIDs[nID] = false;
+}
+
+////////////////////////////////////////////
+void CIDGenerator::Mark(WORD nID)
+{
+	assert(m_vUsedIDs[nID]==false);
+	m_vUsedIDs[nID] = true;
+}
+
+bool CIDGenerator::IsUsed(WORD nID)
+{
+	return m_vUsedIDs[nID];
+}