139 lines
3.7 KiB
C++
139 lines
3.7 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 __BINSEARCH_H__
|
|
#define __BINSEARCH_H__
|
|
|
|
/*
|
|
===============================================================================
|
|
|
|
Binary Search templates
|
|
|
|
The array elements have to be ordered in increasing order.
|
|
|
|
===============================================================================
|
|
*/
|
|
|
|
/*
|
|
====================
|
|
idBinSearch_GreaterEqual
|
|
|
|
Finds the last array element which is smaller than the given value.
|
|
====================
|
|
*/
|
|
template< class type >
|
|
ID_INLINE int idBinSearch_Less( const type *array, const int arraySize, const type &value ) {
|
|
int len = arraySize;
|
|
int mid = len;
|
|
int offset = 0;
|
|
while( mid > 0 ) {
|
|
mid = len >> 1;
|
|
if ( array[offset+mid] < value ) {
|
|
offset += mid;
|
|
}
|
|
len -= mid;
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
/*
|
|
====================
|
|
idBinSearch_GreaterEqual
|
|
|
|
Finds the last array element which is smaller than or equal to the given value.
|
|
====================
|
|
*/
|
|
template< class type >
|
|
ID_INLINE int idBinSearch_LessEqual( const type *array, const int arraySize, const type &value ) {
|
|
int len = arraySize;
|
|
int mid = len;
|
|
int offset = 0;
|
|
while( mid > 0 ) {
|
|
mid = len >> 1;
|
|
if ( array[offset+mid] <= value ) {
|
|
offset += mid;
|
|
}
|
|
len -= mid;
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
/*
|
|
====================
|
|
idBinSearch_Greater
|
|
|
|
Finds the first array element which is greater than the given value.
|
|
====================
|
|
*/
|
|
template< class type >
|
|
ID_INLINE int idBinSearch_Greater( const type *array, const int arraySize, const type &value ) {
|
|
int len = arraySize;
|
|
int mid = len;
|
|
int offset = 0;
|
|
int res = 0;
|
|
while( mid > 0 ) {
|
|
mid = len >> 1;
|
|
if ( array[offset+mid] > value ) {
|
|
res = 0;
|
|
} else {
|
|
offset += mid;
|
|
res = 1;
|
|
}
|
|
len -= mid;
|
|
}
|
|
return offset+res;
|
|
}
|
|
|
|
/*
|
|
====================
|
|
idBinSearch_GreaterEqual
|
|
|
|
Finds the first array element which is greater than or equal to the given value.
|
|
====================
|
|
*/
|
|
template< class type >
|
|
ID_INLINE int idBinSearch_GreaterEqual( const type *array, const int arraySize, const type &value ) {
|
|
int len = arraySize;
|
|
int mid = len;
|
|
int offset = 0;
|
|
int res = 0;
|
|
while( mid > 0 ) {
|
|
mid = len >> 1;
|
|
if ( array[offset+mid] >= value ) {
|
|
res = 0;
|
|
} else {
|
|
offset += mid;
|
|
res = 1;
|
|
}
|
|
len -= mid;
|
|
}
|
|
return offset+res;
|
|
}
|
|
|
|
#endif /* !__BINSEARCH_H__ */
|