mirror of
https://github.com/dhewm/dhewm3.git
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354 lines
8.7 KiB
C++
354 lines
8.7 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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#include "../precompiled.h"
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#pragma hdrstop
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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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/*
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=============
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idODE_Euler::idODE_Euler
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=============
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*/
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idODE_Euler::idODE_Euler( const int dim, deriveFunction_t dr, const void *ud ) {
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dimension = dim;
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derivatives = new float[dim];
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derive = dr;
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userData = ud;
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}
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/*
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=============
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idODE_Euler::~idODE_Euler
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=============
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*/
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idODE_Euler::~idODE_Euler( void ) {
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delete[] derivatives;
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}
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/*
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=============
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idODE_Euler::Evaluate
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=============
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*/
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float idODE_Euler::Evaluate( const float *state, float *newState, float t0, float t1 ) {
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float delta;
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int i;
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derive( t0, userData, state, derivatives );
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delta = t1 - t0;
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for ( i = 0; i < dimension; i++ ) {
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newState[i] = state[i] + delta * derivatives[i];
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}
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return delta;
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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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/*
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=============
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idODE_Midpoint::idODE_Midpoint
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=============
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*/
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idODE_Midpoint::idODE_Midpoint( const int dim, deriveFunction_t dr, const void *ud ) {
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dimension = dim;
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tmpState = new float[dim];
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derivatives = new float[dim];
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derive = dr;
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userData = ud;
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}
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/*
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=============
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idODE_Midpoint::~idODE_Midpoint
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=============
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*/
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idODE_Midpoint::~idODE_Midpoint( void ) {
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delete tmpState;
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delete derivatives;
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}
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/*
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=============
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idODE_Midpoint::~Evaluate
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=============
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*/
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float idODE_Midpoint::Evaluate( const float *state, float *newState, float t0, float t1 ) {
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double delta, halfDelta;
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int i;
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delta = t1 - t0;
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halfDelta = delta * 0.5;
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// first step
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derive( t0, userData, state, derivatives );
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + halfDelta * derivatives[i];
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}
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// second step
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derive( t0 + halfDelta, userData, tmpState, derivatives );
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for ( i = 0; i < dimension; i++ ) {
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newState[i] = state[i] + delta * derivatives[i];
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}
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return delta;
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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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/*
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=============
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idODE_RK4::idODE_RK4
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=============
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*/
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idODE_RK4::idODE_RK4( const int dim, deriveFunction_t dr, const void *ud ) {
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dimension = dim;
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derive = dr;
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userData = ud;
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tmpState = new float[dim];
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d1 = new float[dim];
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d2 = new float[dim];
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d3 = new float[dim];
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d4 = new float[dim];
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}
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/*
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=============
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idODE_RK4::~idODE_RK4
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=============
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*/
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idODE_RK4::~idODE_RK4( void ) {
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delete tmpState;
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delete d1;
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delete d2;
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delete d3;
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delete d4;
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}
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/*
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=============
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idODE_RK4::Evaluate
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=============
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*/
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float idODE_RK4::Evaluate( const float *state, float *newState, float t0, float t1 ) {
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double delta, halfDelta, sixthDelta;
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int i;
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delta = t1 - t0;
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halfDelta = delta * 0.5;
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// first step
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derive( t0, userData, state, d1 );
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + halfDelta * d1[i];
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}
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// second step
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derive( t0 + halfDelta, userData, tmpState, d2 );
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + halfDelta * d2[i];
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}
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// third step
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derive( t0 + halfDelta, userData, tmpState, d3 );
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + delta * d3[i];
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}
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// fourth step
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derive( t0 + delta, userData, tmpState, d4 );
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sixthDelta = delta * (1.0/6.0);
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for ( i = 0; i < dimension; i++ ) {
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newState[i] = state[i] + sixthDelta * (d1[i] + 2.0 * (d2[i] + d3[i]) + d4[i]);
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}
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return delta;
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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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/*
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=============
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idODE_RK4Adaptive::idODE_RK4Adaptive
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=============
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*/
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idODE_RK4Adaptive::idODE_RK4Adaptive( const int dim, deriveFunction_t dr, const void *ud ) {
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dimension = dim;
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derive = dr;
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userData = ud;
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maxError = 0.01f;
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tmpState = new float[dim];
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d1 = new float[dim];
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d1half = new float [dim];
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d2 = new float[dim];
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d3 = new float[dim];
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d4 = new float[dim];
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}
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/*
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=============
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idODE_RK4Adaptive::~idODE_RK4Adaptive
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=============
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*/
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idODE_RK4Adaptive::~idODE_RK4Adaptive( void ) {
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delete tmpState;
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delete d1;
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delete d1half;
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delete d2;
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delete d3;
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delete d4;
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}
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/*
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=============
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idODE_RK4Adaptive::SetMaxError
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=============
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*/
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void idODE_RK4Adaptive::SetMaxError( const float err ) {
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if ( err > 0.0f ) {
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maxError = err;
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}
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}
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/*
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=============
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idODE_RK4Adaptive::Evaluate
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=============
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*/
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float idODE_RK4Adaptive::Evaluate( const float *state, float *newState, float t0, float t1 ) {
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double delta, halfDelta, fourthDelta, sixthDelta;
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double error, max;
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int i, n;
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delta = t1 - t0;
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for ( n = 0; n < 4; n++ ) {
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halfDelta = delta * 0.5;
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fourthDelta = delta * 0.25;
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// first step of first half delta
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derive( t0, userData, state, d1 );
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + fourthDelta * d1[i];
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}
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// second step of first half delta
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derive( t0 + fourthDelta, userData, tmpState, d2 );
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + fourthDelta * d2[i];
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}
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// third step of first half delta
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derive( t0 + fourthDelta, userData, tmpState, d3 );
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + halfDelta * d3[i];
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}
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// fourth step of first half delta
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derive( t0 + halfDelta, userData, tmpState, d4 );
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sixthDelta = halfDelta * (1.0/6.0);
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + sixthDelta * (d1[i] + 2.0 * (d2[i] + d3[i]) + d4[i]);
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}
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// first step of second half delta
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derive( t0 + halfDelta, userData, tmpState, d1half );
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + fourthDelta * d1half[i];
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}
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// second step of second half delta
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derive( t0 + halfDelta + fourthDelta, userData, tmpState, d2 );
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + fourthDelta * d2[i];
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}
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// third step of second half delta
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derive( t0 + halfDelta + fourthDelta, userData, tmpState, d3 );
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + halfDelta * d3[i];
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}
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// fourth step of second half delta
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derive( t0 + delta, userData, tmpState, d4 );
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sixthDelta = halfDelta * (1.0/6.0);
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for ( i = 0; i < dimension; i++ ) {
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newState[i] = state[i] + sixthDelta * (d1[i] + 2.0 * (d2[i] + d3[i]) + d4[i]);
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}
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// first step of full delta
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + halfDelta * d1[i];
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}
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// second step of full delta
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derive( t0 + halfDelta, userData, tmpState, d2 );
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + halfDelta * d2[i];
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}
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// third step of full delta
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derive( t0 + halfDelta, userData, tmpState, d3 );
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + delta * d3[i];
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}
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// fourth step of full delta
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derive( t0 + delta, userData, tmpState, d4 );
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sixthDelta = delta * (1.0/6.0);
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for ( i = 0; i < dimension; i++ ) {
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tmpState[i] = state[i] + sixthDelta * (d1[i] + 2.0 * (d2[i] + d3[i]) + d4[i]);
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}
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// get max estimated error
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max = 0.0;
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for ( i = 0; i < dimension; i++ ) {
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error = idMath::Fabs( (newState[i] - tmpState[i]) / (delta * d1[i] + 1e-10) );
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if ( error > max ) {
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max = error;
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}
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}
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error = max / maxError;
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if ( error <= 1.0f ) {
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return delta * 4.0;
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}
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if ( delta <= 1e-7 ) {
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return delta;
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}
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delta *= 0.25;
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}
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return delta;
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}
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