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lib/haxebullet/bullet/LinearMath/btHashMap.h

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+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2009 Erwin Coumans  http://bulletphysics.org
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+
+#ifndef BT_HASH_MAP_H
+#define BT_HASH_MAP_H
+
+#include "btAlignedObjectArray.h"
+
+///very basic hashable string implementation, compatible with btHashMap
+struct btHashString
+{
+	const char* m_string;
+	unsigned int	m_hash;
+
+	SIMD_FORCE_INLINE	unsigned int getHash()const
+	{
+		return m_hash;
+	}
+
+	btHashString(const char* name)
+		:m_string(name)
+	{
+		/* magic numbers from http://www.isthe.com/chongo/tech/comp/fnv/ */
+		static const unsigned int  InitialFNV = 2166136261u;
+		static const unsigned int FNVMultiple = 16777619u;
+
+		/* Fowler / Noll / Vo (FNV) Hash */
+		unsigned int hash = InitialFNV;
+		
+		for(int i = 0; m_string[i]; i++)
+		{
+			hash = hash ^ (m_string[i]);       /* xor  the low 8 bits */
+			hash = hash * FNVMultiple;  /* multiply by the magic number */
+		}
+		m_hash = hash;
+	}
+
+	int portableStringCompare(const char* src,	const char* dst) const
+	{
+			int ret = 0 ;
+
+			while( ! (ret = *(const unsigned char *)src - *(const unsigned char *)dst) && *dst)
+					++src, ++dst;
+
+			if ( ret < 0 )
+					ret = -1 ;
+			else if ( ret > 0 )
+					ret = 1 ;
+
+			return( ret );
+	}
+
+	bool equals(const btHashString& other) const
+	{
+		return (m_string == other.m_string) ||
+			(0==portableStringCompare(m_string,other.m_string));
+
+	}
+
+};
+
+const int BT_HASH_NULL=0xffffffff;
+
+
+class btHashInt
+{
+	int	m_uid;
+public:
+
+	btHashInt()
+	{
+	}
+
+	btHashInt(int uid)	:m_uid(uid)
+	{
+	}
+
+	int	getUid1() const
+	{
+		return m_uid;
+	}
+
+	void	setUid1(int uid)
+	{
+		m_uid = uid;
+	}
+
+	bool equals(const btHashInt& other) const
+	{
+		return getUid1() == other.getUid1();
+	}
+	//to our success
+	SIMD_FORCE_INLINE	unsigned int getHash()const
+	{
+		unsigned int key = m_uid;
+		// Thomas Wang's hash
+		key += ~(key << 15);	key ^=  (key >> 10);	key +=  (key << 3);	key ^=  (key >> 6);	key += ~(key << 11);	key ^=  (key >> 16);
+		
+		return key;
+	}
+};
+
+
+
+class btHashPtr
+{
+
+	union
+	{
+		const void*	m_pointer;
+		unsigned int	m_hashValues[2];
+	};
+
+public:
+
+	btHashPtr(const void* ptr)
+		:m_pointer(ptr)
+	{
+	}
+
+	const void*	getPointer() const
+	{
+		return m_pointer;
+	}
+
+	bool equals(const btHashPtr& other) const
+	{
+		return getPointer() == other.getPointer();
+	}
+
+	//to our success
+	SIMD_FORCE_INLINE	unsigned int getHash()const
+	{
+		const bool VOID_IS_8 = ((sizeof(void*)==8));
+		
+		unsigned int key = VOID_IS_8? m_hashValues[0]+m_hashValues[1] : m_hashValues[0];
+		// Thomas Wang's hash
+		key += ~(key << 15);	key ^=  (key >> 10);	key +=  (key << 3);	key ^=  (key >> 6);	key += ~(key << 11);	key ^=  (key >> 16);
+		return key;
+	}
+
+	
+};
+
+
+template <class Value>
+class btHashKeyPtr
+{
+        int     m_uid;
+public:
+
+        btHashKeyPtr(int uid)    :m_uid(uid)
+        {
+        }
+
+        int     getUid1() const
+        {
+                return m_uid;
+        }
+
+        bool equals(const btHashKeyPtr<Value>& other) const
+        {
+                return getUid1() == other.getUid1();
+        }
+
+        //to our success
+        SIMD_FORCE_INLINE       unsigned int getHash()const
+        {
+                unsigned int key = m_uid;
+                // Thomas Wang's hash
+                key += ~(key << 15);	key ^=  (key >> 10);	key +=  (key << 3);	key ^=  (key >> 6);	key += ~(key << 11);	key ^=  (key >> 16);
+                return key;
+        }
+
+        
+};
+
+
+template <class Value>
+class btHashKey
+{
+	int	m_uid;
+public:
+
+	btHashKey(int uid)	:m_uid(uid)
+	{
+	}
+
+	int	getUid1() const
+	{
+		return m_uid;
+	}
+
+	bool equals(const btHashKey<Value>& other) const
+	{
+		return getUid1() == other.getUid1();
+	}
+	//to our success
+	SIMD_FORCE_INLINE	unsigned int getHash()const
+	{
+		unsigned int key = m_uid;
+		// Thomas Wang's hash
+		key += ~(key << 15);	key ^=  (key >> 10);	key +=  (key << 3);	key ^=  (key >> 6);	key += ~(key << 11);	key ^=  (key >> 16);
+		return key;
+	}
+};
+
+
+///The btHashMap template class implements a generic and lightweight hashmap.
+///A basic sample of how to use btHashMap is located in Demos\BasicDemo\main.cpp
+template <class Key, class Value>
+class btHashMap
+{
+
+protected:
+	btAlignedObjectArray<int>		m_hashTable;
+	btAlignedObjectArray<int>		m_next;
+	
+	btAlignedObjectArray<Value>		m_valueArray;
+	btAlignedObjectArray<Key>		m_keyArray;
+
+	void	growTables(const Key& /*key*/)
+	{
+		int newCapacity = m_valueArray.capacity();
+
+		if (m_hashTable.size() < newCapacity)
+		{
+			//grow hashtable and next table
+			int curHashtableSize = m_hashTable.size();
+
+			m_hashTable.resize(newCapacity);
+			m_next.resize(newCapacity);
+
+			int i;
+
+			for (i= 0; i < newCapacity; ++i)
+			{
+				m_hashTable[i] = BT_HASH_NULL;
+			}
+			for (i = 0; i < newCapacity; ++i)
+			{
+				m_next[i] = BT_HASH_NULL;
+			}
+
+			for(i=0;i<curHashtableSize;i++)
+			{
+				//const Value& value = m_valueArray[i];
+				//const Key& key = m_keyArray[i];
+
+				int	hashValue = m_keyArray[i].getHash() & (m_valueArray.capacity()-1);	// New hash value with new mask
+				m_next[i] = m_hashTable[hashValue];
+				m_hashTable[hashValue] = i;
+			}
+
+
+		}
+	}
+
+	public:
+
+	void insert(const Key& key, const Value& value) {
+		int hash = key.getHash() & (m_valueArray.capacity()-1);
+
+		//replace value if the key is already there
+		int index = findIndex(key);
+		if (index != BT_HASH_NULL)
+		{
+			m_valueArray[index]=value;
+			return;
+		}
+
+		int count = m_valueArray.size();
+		int oldCapacity = m_valueArray.capacity();
+		m_valueArray.push_back(value);
+		m_keyArray.push_back(key);
+
+		int newCapacity = m_valueArray.capacity();
+		if (oldCapacity < newCapacity)
+		{
+			growTables(key);
+			//hash with new capacity
+			hash = key.getHash() & (m_valueArray.capacity()-1);
+		}
+		m_next[count] = m_hashTable[hash];
+		m_hashTable[hash] = count;
+	}
+
+	void remove(const Key& key) {
+
+		int hash = key.getHash() & (m_valueArray.capacity()-1);
+
+		int pairIndex = findIndex(key);
+		
+		if (pairIndex ==BT_HASH_NULL)
+		{
+			return;
+		}
+
+		// Remove the pair from the hash table.
+		int index = m_hashTable[hash];
+		btAssert(index != BT_HASH_NULL);
+
+		int previous = BT_HASH_NULL;
+		while (index != pairIndex)
+		{
+			previous = index;
+			index = m_next[index];
+		}
+
+		if (previous != BT_HASH_NULL)
+		{
+			btAssert(m_next[previous] == pairIndex);
+			m_next[previous] = m_next[pairIndex];
+		}
+		else
+		{
+			m_hashTable[hash] = m_next[pairIndex];
+		}
+
+		// We now move the last pair into spot of the
+		// pair being removed. We need to fix the hash
+		// table indices to support the move.
+
+		int lastPairIndex = m_valueArray.size() - 1;
+
+		// If the removed pair is the last pair, we are done.
+		if (lastPairIndex == pairIndex)
+		{
+			m_valueArray.pop_back();
+			m_keyArray.pop_back();
+			return;
+		}
+
+		// Remove the last pair from the hash table.
+		int lastHash = m_keyArray[lastPairIndex].getHash() & (m_valueArray.capacity()-1);
+
+		index = m_hashTable[lastHash];
+		btAssert(index != BT_HASH_NULL);
+
+		previous = BT_HASH_NULL;
+		while (index != lastPairIndex)
+		{
+			previous = index;
+			index = m_next[index];
+		}
+
+		if (previous != BT_HASH_NULL)
+		{
+			btAssert(m_next[previous] == lastPairIndex);
+			m_next[previous] = m_next[lastPairIndex];
+		}
+		else
+		{
+			m_hashTable[lastHash] = m_next[lastPairIndex];
+		}
+
+		// Copy the last pair into the remove pair's spot.
+		m_valueArray[pairIndex] = m_valueArray[lastPairIndex];
+		m_keyArray[pairIndex] = m_keyArray[lastPairIndex];
+
+		// Insert the last pair into the hash table
+		m_next[pairIndex] = m_hashTable[lastHash];
+		m_hashTable[lastHash] = pairIndex;
+
+		m_valueArray.pop_back();
+		m_keyArray.pop_back();
+
+	}
+
+
+	int size() const
+	{
+		return m_valueArray.size();
+	}
+
+	const Value* getAtIndex(int index) const
+	{
+		btAssert(index < m_valueArray.size());
+		btAssert(index>=0);
+		if (index>=0 && index < m_valueArray.size())
+		{
+			return &m_valueArray[index];
+		}
+		return 0;
+	}
+
+	Value* getAtIndex(int index)
+	{
+		btAssert(index < m_valueArray.size());
+		btAssert(index>=0);
+		if (index>=0 && index < m_valueArray.size())
+		{
+			return &m_valueArray[index];
+		}
+		return 0;
+	}
+
+    Key getKeyAtIndex(int index)
+    {
+        btAssert(index < m_keyArray.size());
+		btAssert(index>=0);
+		return m_keyArray[index];
+    }
+    
+    const Key getKeyAtIndex(int index) const
+    {
+        btAssert(index < m_keyArray.size());
+		btAssert(index>=0);
+		return m_keyArray[index];
+   }
+
+
+	Value* operator[](const Key& key) {
+		return find(key);
+	}
+
+	const Value* operator[](const Key& key) const {
+		return find(key);
+	}
+
+	const Value*	find(const Key& key) const
+	{
+		int index = findIndex(key);
+		if (index == BT_HASH_NULL)
+		{
+			return NULL;
+		}
+		return &m_valueArray[index];
+	}
+
+	Value*	find(const Key& key)
+	{
+		int index = findIndex(key);
+		if (index == BT_HASH_NULL)
+		{
+			return NULL;
+		}
+		return &m_valueArray[index];
+	}
+
+
+	int	findIndex(const Key& key) const
+	{
+		unsigned int hash = key.getHash() & (m_valueArray.capacity()-1);
+
+		if (hash >= (unsigned int)m_hashTable.size())
+		{
+			return BT_HASH_NULL;
+		}
+
+		int index = m_hashTable[hash];
+		while ((index != BT_HASH_NULL) && key.equals(m_keyArray[index]) == false)
+		{
+			index = m_next[index];
+		}
+		return index;
+	}
+
+	void	clear()
+	{
+		m_hashTable.clear();
+		m_next.clear();
+		m_valueArray.clear();
+		m_keyArray.clear();
+	}
+
+};
+
+#endif //BT_HASH_MAP_H