mirror of
https://github.com/dhewm/dhewm3.git
synced 2024-11-30 16:11:11 +00:00
146 lines
4.4 KiB
C++
146 lines
4.4 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 __MATH_ODE_H__
|
|
#define __MATH_ODE_H__
|
|
|
|
/*
|
|
===============================================================================
|
|
|
|
Numerical solvers for ordinary differential equations.
|
|
|
|
===============================================================================
|
|
*/
|
|
|
|
|
|
//===============================================================
|
|
//
|
|
// idODE
|
|
//
|
|
//===============================================================
|
|
|
|
typedef void (*deriveFunction_t)( const float t, const void *userData, const float *state, float *derivatives );
|
|
|
|
class idODE {
|
|
|
|
public:
|
|
virtual ~idODE( void ) {}
|
|
|
|
virtual float Evaluate( const float *state, float *newState, float t0, float t1 ) = 0;
|
|
|
|
protected:
|
|
int dimension; // dimension in floats allocated for
|
|
deriveFunction_t derive; // derive function
|
|
const void * userData; // client data
|
|
};
|
|
|
|
//===============================================================
|
|
//
|
|
// idODE_Euler
|
|
//
|
|
//===============================================================
|
|
|
|
class idODE_Euler : public idODE {
|
|
|
|
public:
|
|
idODE_Euler( const int dim, const deriveFunction_t dr, const void *ud );
|
|
virtual ~idODE_Euler( void );
|
|
|
|
virtual float Evaluate( const float *state, float *newState, float t0, float t1 );
|
|
|
|
protected:
|
|
float * derivatives; // space to store derivatives
|
|
};
|
|
|
|
//===============================================================
|
|
//
|
|
// idODE_Midpoint
|
|
//
|
|
//===============================================================
|
|
|
|
class idODE_Midpoint : public idODE {
|
|
|
|
public:
|
|
idODE_Midpoint( const int dim, const deriveFunction_t dr, const void *ud );
|
|
virtual ~idODE_Midpoint( void );
|
|
|
|
virtual float Evaluate( const float *state, float *newState, float t0, float t1 );
|
|
|
|
protected:
|
|
float * tmpState;
|
|
float * derivatives; // space to store derivatives
|
|
};
|
|
|
|
//===============================================================
|
|
//
|
|
// idODE_RK4
|
|
//
|
|
//===============================================================
|
|
|
|
class idODE_RK4 : public idODE {
|
|
|
|
public:
|
|
idODE_RK4( const int dim, const deriveFunction_t dr, const void *ud );
|
|
virtual ~idODE_RK4( void );
|
|
|
|
virtual float Evaluate( const float *state, float *newState, float t0, float t1 );
|
|
|
|
protected:
|
|
float * tmpState;
|
|
float * d1; // derivatives
|
|
float * d2;
|
|
float * d3;
|
|
float * d4;
|
|
};
|
|
|
|
//===============================================================
|
|
//
|
|
// idODE_RK4Adaptive
|
|
//
|
|
//===============================================================
|
|
|
|
class idODE_RK4Adaptive : public idODE {
|
|
|
|
public:
|
|
idODE_RK4Adaptive( const int dim, const deriveFunction_t dr, const void *ud );
|
|
virtual ~idODE_RK4Adaptive( void );
|
|
|
|
virtual float Evaluate( const float *state, float *newState, float t0, float t1 );
|
|
void SetMaxError( const float err );
|
|
|
|
protected:
|
|
float maxError; // maximum allowed error
|
|
float * tmpState;
|
|
float * d1; // derivatives
|
|
float * d1half;
|
|
float * d2;
|
|
float * d3;
|
|
float * d4;
|
|
};
|
|
|
|
#endif /* !__MATH_ODE_H__ */
|