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https://github.com/dhewm/dhewm3.git
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0d27bfe7b9
Apart from some minor stuff, this changes the signature of some methods of Parser and Token classes and of the (unused) Random2 class. That no problem though, because the calling code uses normal ints anyway.
160 lines
4.6 KiB
C++
160 lines
4.6 KiB
C++
/*
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===========================================================================
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Doom 3 GPL Source Code
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Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 GPL Source Code ("Doom 3 Source Code").
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Doom 3 Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 Source Code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 Source Code. If not, see <http://www.gnu.org/licenses/>.
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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.
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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.
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===========================================================================
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*/
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#ifndef __MATH_RANDOM_H__
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#define __MATH_RANDOM_H__
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#include "idlib/math/Math.h"
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/*
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===============================================================================
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Random number generator
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===============================================================================
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*/
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class idRandom {
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public:
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idRandom( int seed = 0 );
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void SetSeed( int seed );
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int GetSeed( void ) const;
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int RandomInt( void ); // random integer in the range [0, MAX_RAND]
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int RandomInt( int max ); // random integer in the range [0, max[
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float RandomFloat( void ); // random number in the range [0.0f, 1.0f]
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float CRandomFloat( void ); // random number in the range [-1.0f, 1.0f]
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static const int MAX_RAND = 0x7fff;
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private:
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int seed;
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};
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ID_INLINE idRandom::idRandom( int seed ) {
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this->seed = seed;
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}
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ID_INLINE void idRandom::SetSeed( int seed ) {
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this->seed = seed;
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}
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ID_INLINE int idRandom::GetSeed( void ) const {
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return seed;
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}
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ID_INLINE int idRandom::RandomInt( void ) {
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seed = 69069 * seed + 1;
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return ( seed & idRandom::MAX_RAND );
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}
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ID_INLINE int idRandom::RandomInt( int max ) {
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if ( max == 0 ) {
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return 0; // avoid divide by zero error
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}
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return RandomInt() % max;
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}
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ID_INLINE float idRandom::RandomFloat( void ) {
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return ( RandomInt() / ( float )( idRandom::MAX_RAND + 1 ) );
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}
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ID_INLINE float idRandom::CRandomFloat( void ) {
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return ( 2.0f * ( RandomFloat() - 0.5f ) );
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}
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/*
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===============================================================================
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Random number generator
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===============================================================================
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*/
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class idRandom2 {
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public:
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idRandom2( unsigned int seed = 0 );
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void SetSeed( unsigned int seed );
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unsigned int GetSeed( void ) const;
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int RandomInt( void ); // random integer in the range [0, MAX_RAND]
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int RandomInt( int max ); // random integer in the range [0, max]
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float RandomFloat( void ); // random number in the range [0.0f, 1.0f]
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float CRandomFloat( void ); // random number in the range [-1.0f, 1.0f]
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static const int MAX_RAND = 0x7fff;
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private:
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unsigned int seed;
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static const unsigned int IEEE_ONE = 0x3f800000;
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static const unsigned int IEEE_MASK = 0x007fffff;
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};
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ID_INLINE idRandom2::idRandom2( unsigned int seed ) {
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this->seed = seed;
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}
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ID_INLINE void idRandom2::SetSeed( unsigned int seed ) {
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this->seed = seed;
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}
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ID_INLINE unsigned int idRandom2::GetSeed( void ) const {
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return seed;
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}
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ID_INLINE int idRandom2::RandomInt( void ) {
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seed = 1664525 * seed + 1013904223;
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return ( (int) seed & idRandom2::MAX_RAND );
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}
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ID_INLINE int idRandom2::RandomInt( int max ) {
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if ( max == 0 ) {
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return 0; // avoid divide by zero error
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}
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return ( RandomInt() >> ( 16 - idMath::BitsForInteger( max ) ) ) % max;
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}
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ID_INLINE float idRandom2::RandomFloat( void ) {
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unsigned int i;
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seed = 1664525 * seed + 1013904223;
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i = idRandom2::IEEE_ONE | ( seed & idRandom2::IEEE_MASK );
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return ( ( *(float *)&i ) - 1.0f );
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}
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ID_INLINE float idRandom2::CRandomFloat( void ) {
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unsigned int i;
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seed = 1664525 * seed + 1013904223;
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i = idRandom2::IEEE_ONE | ( seed & idRandom2::IEEE_MASK );
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return ( 2.0f * ( *(float *)&i ) - 3.0f );
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}
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#endif /* !__MATH_RANDOM_H__ */
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