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146 lines
4.4 KiB
C++
146 lines
4.4 KiB
C++
/*
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===========================================================================
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Doom 3 BFG Edition GPL Source Code
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Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
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Doom 3 BFG Edition 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 BFG Edition 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 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 BFG Edition 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 BFG Edition 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_ODE_H__
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#define __MATH_ODE_H__
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/*
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===============================================================================
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Numerical solvers for ordinary differential equations.
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===============================================================================
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*/
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//===============================================================
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//
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// idODE
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//
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//===============================================================
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typedef void (*deriveFunction_t)( const float t, const void *userData, const float *state, float *derivatives );
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class idODE {
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public:
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virtual ~idODE() {}
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virtual float Evaluate( const float *state, float *newState, float t0, float t1 ) = 0;
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protected:
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int dimension; // dimension in floats allocated for
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deriveFunction_t derive; // derive function
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const void * userData; // client data
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};
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//===============================================================
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//
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// idODE_Euler
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//
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//===============================================================
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class idODE_Euler : public idODE {
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public:
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idODE_Euler( const int dim, const deriveFunction_t dr, const void *ud );
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virtual ~idODE_Euler();
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virtual float Evaluate( const float *state, float *newState, float t0, float t1 );
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protected:
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float * derivatives; // space to store derivatives
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};
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//===============================================================
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//
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// idODE_Midpoint
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//
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//===============================================================
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class idODE_Midpoint : public idODE {
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public:
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idODE_Midpoint( const int dim, const deriveFunction_t dr, const void *ud );
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virtual ~idODE_Midpoint();
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virtual float Evaluate( const float *state, float *newState, float t0, float t1 );
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protected:
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float * tmpState;
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float * derivatives; // space to store derivatives
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};
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//===============================================================
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//
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// idODE_RK4
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//
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//===============================================================
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class idODE_RK4 : public idODE {
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public:
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idODE_RK4( const int dim, const deriveFunction_t dr, const void *ud );
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virtual ~idODE_RK4();
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virtual float Evaluate( const float *state, float *newState, float t0, float t1 );
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protected:
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float * tmpState;
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float * d1; // derivatives
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float * d2;
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float * d3;
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float * d4;
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};
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//===============================================================
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//
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// idODE_RK4Adaptive
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//
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//===============================================================
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class idODE_RK4Adaptive : public idODE {
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public:
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idODE_RK4Adaptive( const int dim, const deriveFunction_t dr, const void *ud );
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virtual ~idODE_RK4Adaptive();
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virtual float Evaluate( const float *state, float *newState, float t0, float t1 );
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void SetMaxError( const float err );
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protected:
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float maxError; // maximum allowed error
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float * tmpState;
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float * d1; // derivatives
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float * d1half;
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float * d2;
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float * d3;
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float * d4;
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};
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#endif /* !__MATH_ODE_H__ */
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