mirror of
https://github.com/dhewm/dhewm3.git
synced 2024-11-23 21:02:11 +00:00
405 lines
10 KiB
C++
405 lines
10 KiB
C++
/*
|
|
===========================================================================
|
|
|
|
Doom 3 GPL Source Code
|
|
Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.
|
|
|
|
This file is part of the Doom 3 GPL Source Code (?Doom 3 Source Code?).
|
|
|
|
Doom 3 Source Code is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
Doom 3 Source Code is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with Doom 3 Source Code. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code. If not, please request a copy in writing from id Software at the address below.
|
|
|
|
If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
|
|
|
|
===========================================================================
|
|
*/
|
|
|
|
#ifndef __HASHINDEX_H__
|
|
#define __HASHINDEX_H__
|
|
|
|
/*
|
|
===============================================================================
|
|
|
|
Fast hash table for indexes and arrays.
|
|
Does not allocate memory until the first key/index pair is added.
|
|
|
|
===============================================================================
|
|
*/
|
|
|
|
#define DEFAULT_HASH_SIZE 1024
|
|
#define DEFAULT_HASH_GRANULARITY 1024
|
|
|
|
class idHashIndex {
|
|
public:
|
|
idHashIndex( void );
|
|
idHashIndex( const int initialHashSize, const int initialIndexSize );
|
|
~idHashIndex( void );
|
|
|
|
// returns total size of allocated memory
|
|
size_t Allocated( void ) const;
|
|
// returns total size of allocated memory including size of hash index type
|
|
size_t Size( void ) const;
|
|
|
|
idHashIndex & operator=( const idHashIndex &other );
|
|
// add an index to the hash, assumes the index has not yet been added to the hash
|
|
void Add( const int key, const int index );
|
|
// remove an index from the hash
|
|
void Remove( const int key, const int index );
|
|
// get the first index from the hash, returns -1 if empty hash entry
|
|
int First( const int key ) const;
|
|
// get the next index from the hash, returns -1 if at the end of the hash chain
|
|
int Next( const int index ) const;
|
|
// insert an entry into the index and add it to the hash, increasing all indexes >= index
|
|
void InsertIndex( const int key, const int index );
|
|
// remove an entry from the index and remove it from the hash, decreasing all indexes >= index
|
|
void RemoveIndex( const int key, const int index );
|
|
// clear the hash
|
|
void Clear( void );
|
|
// clear and resize
|
|
void Clear( const int newHashSize, const int newIndexSize );
|
|
// free allocated memory
|
|
void Free( void );
|
|
// get size of hash table
|
|
int GetHashSize( void ) const;
|
|
// get size of the index
|
|
int GetIndexSize( void ) const;
|
|
// set granularity
|
|
void SetGranularity( const int newGranularity );
|
|
// force resizing the index, current hash table stays intact
|
|
void ResizeIndex( const int newIndexSize );
|
|
// returns number in the range [0-100] representing the spread over the hash table
|
|
int GetSpread( void ) const;
|
|
// returns a key for a string
|
|
int GenerateKey( const char *string, bool caseSensitive = true ) const;
|
|
// returns a key for a vector
|
|
int GenerateKey( const idVec3 &v ) const;
|
|
// returns a key for two integers
|
|
int GenerateKey( const int n1, const int n2 ) const;
|
|
|
|
private:
|
|
int hashSize;
|
|
int * hash;
|
|
int indexSize;
|
|
int * indexChain;
|
|
int granularity;
|
|
int hashMask;
|
|
int lookupMask;
|
|
|
|
static int INVALID_INDEX[1];
|
|
|
|
void Init( const int initialHashSize, const int initialIndexSize );
|
|
void Allocate( const int newHashSize, const int newIndexSize );
|
|
};
|
|
|
|
/*
|
|
================
|
|
idHashIndex::idHashIndex
|
|
================
|
|
*/
|
|
ID_INLINE idHashIndex::idHashIndex( void ) {
|
|
Init( DEFAULT_HASH_SIZE, DEFAULT_HASH_SIZE );
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::idHashIndex
|
|
================
|
|
*/
|
|
ID_INLINE idHashIndex::idHashIndex( const int initialHashSize, const int initialIndexSize ) {
|
|
Init( initialHashSize, initialIndexSize );
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::~idHashIndex
|
|
================
|
|
*/
|
|
ID_INLINE idHashIndex::~idHashIndex( void ) {
|
|
Free();
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::Allocated
|
|
================
|
|
*/
|
|
ID_INLINE size_t idHashIndex::Allocated( void ) const {
|
|
return hashSize * sizeof( int ) + indexSize * sizeof( int );
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::Size
|
|
================
|
|
*/
|
|
ID_INLINE size_t idHashIndex::Size( void ) const {
|
|
return sizeof( *this ) + Allocated();
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::operator=
|
|
================
|
|
*/
|
|
ID_INLINE idHashIndex &idHashIndex::operator=( const idHashIndex &other ) {
|
|
granularity = other.granularity;
|
|
hashMask = other.hashMask;
|
|
lookupMask = other.lookupMask;
|
|
|
|
if ( other.lookupMask == 0 ) {
|
|
hashSize = other.hashSize;
|
|
indexSize = other.indexSize;
|
|
Free();
|
|
}
|
|
else {
|
|
if ( other.hashSize != hashSize || hash == INVALID_INDEX ) {
|
|
if ( hash != INVALID_INDEX ) {
|
|
delete[] hash;
|
|
}
|
|
hashSize = other.hashSize;
|
|
hash = new int[hashSize];
|
|
}
|
|
if ( other.indexSize != indexSize || indexChain == INVALID_INDEX ) {
|
|
if ( indexChain != INVALID_INDEX ) {
|
|
delete[] indexChain;
|
|
}
|
|
indexSize = other.indexSize;
|
|
indexChain = new int[indexSize];
|
|
}
|
|
memcpy( hash, other.hash, hashSize * sizeof( hash[0] ) );
|
|
memcpy( indexChain, other.indexChain, indexSize * sizeof( indexChain[0] ) );
|
|
}
|
|
|
|
return *this;
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::Add
|
|
================
|
|
*/
|
|
ID_INLINE void idHashIndex::Add( const int key, const int index ) {
|
|
int h;
|
|
|
|
assert( index >= 0 );
|
|
if ( hash == INVALID_INDEX ) {
|
|
Allocate( hashSize, index >= indexSize ? index + 1 : indexSize );
|
|
}
|
|
else if ( index >= indexSize ) {
|
|
ResizeIndex( index + 1 );
|
|
}
|
|
h = key & hashMask;
|
|
indexChain[index] = hash[h];
|
|
hash[h] = index;
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::Remove
|
|
================
|
|
*/
|
|
ID_INLINE void idHashIndex::Remove( const int key, const int index ) {
|
|
int k = key & hashMask;
|
|
|
|
if ( hash == INVALID_INDEX ) {
|
|
return;
|
|
}
|
|
if ( hash[k] == index ) {
|
|
hash[k] = indexChain[index];
|
|
}
|
|
else {
|
|
for ( int i = hash[k]; i != -1; i = indexChain[i] ) {
|
|
if ( indexChain[i] == index ) {
|
|
indexChain[i] = indexChain[index];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
indexChain[index] = -1;
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::First
|
|
================
|
|
*/
|
|
ID_INLINE int idHashIndex::First( const int key ) const {
|
|
return hash[key & hashMask & lookupMask];
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::Next
|
|
================
|
|
*/
|
|
ID_INLINE int idHashIndex::Next( const int index ) const {
|
|
assert( index >= 0 && index < indexSize );
|
|
return indexChain[index & lookupMask];
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::InsertIndex
|
|
================
|
|
*/
|
|
ID_INLINE void idHashIndex::InsertIndex( const int key, const int index ) {
|
|
int i, max;
|
|
|
|
if ( hash != INVALID_INDEX ) {
|
|
max = index;
|
|
for ( i = 0; i < hashSize; i++ ) {
|
|
if ( hash[i] >= index ) {
|
|
hash[i]++;
|
|
if ( hash[i] > max ) {
|
|
max = hash[i];
|
|
}
|
|
}
|
|
}
|
|
for ( i = 0; i < indexSize; i++ ) {
|
|
if ( indexChain[i] >= index ) {
|
|
indexChain[i]++;
|
|
if ( indexChain[i] > max ) {
|
|
max = indexChain[i];
|
|
}
|
|
}
|
|
}
|
|
if ( max >= indexSize ) {
|
|
ResizeIndex( max + 1 );
|
|
}
|
|
for ( i = max; i > index; i-- ) {
|
|
indexChain[i] = indexChain[i-1];
|
|
}
|
|
indexChain[index] = -1;
|
|
}
|
|
Add( key, index );
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::RemoveIndex
|
|
================
|
|
*/
|
|
ID_INLINE void idHashIndex::RemoveIndex( const int key, const int index ) {
|
|
int i, max;
|
|
|
|
Remove( key, index );
|
|
if ( hash != INVALID_INDEX ) {
|
|
max = index;
|
|
for ( i = 0; i < hashSize; i++ ) {
|
|
if ( hash[i] >= index ) {
|
|
if ( hash[i] > max ) {
|
|
max = hash[i];
|
|
}
|
|
hash[i]--;
|
|
}
|
|
}
|
|
for ( i = 0; i < indexSize; i++ ) {
|
|
if ( indexChain[i] >= index ) {
|
|
if ( indexChain[i] > max ) {
|
|
max = indexChain[i];
|
|
}
|
|
indexChain[i]--;
|
|
}
|
|
}
|
|
for ( i = index; i < max; i++ ) {
|
|
indexChain[i] = indexChain[i+1];
|
|
}
|
|
indexChain[max] = -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::Clear
|
|
================
|
|
*/
|
|
ID_INLINE void idHashIndex::Clear( void ) {
|
|
// only clear the hash table because clearing the indexChain is not really needed
|
|
if ( hash != INVALID_INDEX ) {
|
|
memset( hash, 0xff, hashSize * sizeof( hash[0] ) );
|
|
}
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::Clear
|
|
================
|
|
*/
|
|
ID_INLINE void idHashIndex::Clear( const int newHashSize, const int newIndexSize ) {
|
|
Free();
|
|
hashSize = newHashSize;
|
|
indexSize = newIndexSize;
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::GetHashSize
|
|
================
|
|
*/
|
|
ID_INLINE int idHashIndex::GetHashSize( void ) const {
|
|
return hashSize;
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::GetIndexSize
|
|
================
|
|
*/
|
|
ID_INLINE int idHashIndex::GetIndexSize( void ) const {
|
|
return indexSize;
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::SetGranularity
|
|
================
|
|
*/
|
|
ID_INLINE void idHashIndex::SetGranularity( const int newGranularity ) {
|
|
assert( newGranularity > 0 );
|
|
granularity = newGranularity;
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::GenerateKey
|
|
================
|
|
*/
|
|
ID_INLINE int idHashIndex::GenerateKey( const char *string, bool caseSensitive ) const {
|
|
if ( caseSensitive ) {
|
|
return ( idStr::Hash( string ) & hashMask );
|
|
} else {
|
|
return ( idStr::IHash( string ) & hashMask );
|
|
}
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::GenerateKey
|
|
================
|
|
*/
|
|
ID_INLINE int idHashIndex::GenerateKey( const idVec3 &v ) const {
|
|
return ( (((int) v[0]) + ((int) v[1]) + ((int) v[2])) & hashMask );
|
|
}
|
|
|
|
/*
|
|
================
|
|
idHashIndex::GenerateKey
|
|
================
|
|
*/
|
|
ID_INLINE int idHashIndex::GenerateKey( const int n1, const int n2 ) const {
|
|
return ( ( n1 + n2 ) & hashMask );
|
|
}
|
|
|
|
#endif /* !__HASHINDEX_H__ */
|