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241 lines
8.1 KiB
C++
241 lines
8.1 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_EXTRAPOLATE_H__
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#define __MATH_EXTRAPOLATE_H__
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/*
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==============================================================================================
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Extrapolation
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==============================================================================================
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*/
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typedef enum {
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EXTRAPOLATION_NONE = 0x01, // no extrapolation, covered distance = duration * 0.001 * ( baseSpeed )
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EXTRAPOLATION_LINEAR = 0x02, // linear extrapolation, covered distance = duration * 0.001 * ( baseSpeed + speed )
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EXTRAPOLATION_ACCELLINEAR = 0x04, // linear acceleration, covered distance = duration * 0.001 * ( baseSpeed + 0.5 * speed )
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EXTRAPOLATION_DECELLINEAR = 0x08, // linear deceleration, covered distance = duration * 0.001 * ( baseSpeed + 0.5 * speed )
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EXTRAPOLATION_ACCELSINE = 0x10, // sinusoidal acceleration, covered distance = duration * 0.001 * ( baseSpeed + sqrt( 0.5 ) * speed )
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EXTRAPOLATION_DECELSINE = 0x20, // sinusoidal deceleration, covered distance = duration * 0.001 * ( baseSpeed + sqrt( 0.5 ) * speed )
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EXTRAPOLATION_NOSTOP = 0x40 // do not stop at startTime + duration
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} extrapolation_t;
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template< class type >
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class idExtrapolate {
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public:
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idExtrapolate();
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void Init( const float startTime, const float duration, const type &startValue, const type &baseSpeed, const type &speed, const extrapolation_t extrapolationType );
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type GetCurrentValue( float time ) const;
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type GetCurrentSpeed( float time ) const;
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bool IsDone( float time ) const { return ( !( extrapolationType & EXTRAPOLATION_NOSTOP ) && time >= startTime + duration ); }
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void SetStartTime( float time ) { startTime = time; currentTime = -1; }
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float GetStartTime( void ) const { return startTime; }
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float GetEndTime( void ) const { return ( !( extrapolationType & EXTRAPOLATION_NOSTOP ) && duration > 0 ) ? startTime + duration : 0; }
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float GetDuration( void ) const { return duration; }
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void SetStartValue( const type &value ) { startValue = value; currentTime = -1; }
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const type & GetStartValue( void ) const { return startValue; }
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const type & GetBaseSpeed( void ) const { return baseSpeed; }
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const type & GetSpeed( void ) const { return speed; }
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extrapolation_t GetExtrapolationType( void ) const { return extrapolationType; }
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private:
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extrapolation_t extrapolationType;
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float startTime;
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float duration;
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type startValue;
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type baseSpeed;
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type speed;
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mutable float currentTime;
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mutable type currentValue;
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};
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/*
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====================
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idExtrapolate::idExtrapolate
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====================
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*/
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template< class type >
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ID_INLINE idExtrapolate<type>::idExtrapolate() {
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extrapolationType = EXTRAPOLATION_NONE;
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startTime = duration = 0.0f;
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memset( &startValue, 0, sizeof( startValue ) );
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memset( &baseSpeed, 0, sizeof( baseSpeed ) );
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memset( &speed, 0, sizeof( speed ) );
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currentTime = -1;
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currentValue = startValue;
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}
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/*
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====================
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idExtrapolate::Init
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====================
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*/
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template< class type >
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ID_INLINE void idExtrapolate<type>::Init( const float startTime, const float duration, const type &startValue, const type &baseSpeed, const type &speed, const extrapolation_t extrapolationType ) {
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this->extrapolationType = extrapolationType;
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this->startTime = startTime;
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this->duration = duration;
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this->startValue = startValue;
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this->baseSpeed = baseSpeed;
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this->speed = speed;
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currentTime = -1;
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currentValue = startValue;
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}
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/*
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====================
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idExtrapolate::GetCurrentValue
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====================
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*/
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template< class type >
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ID_INLINE type idExtrapolate<type>::GetCurrentValue( float time ) const {
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float deltaTime, s;
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if ( time == currentTime ) {
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return currentValue;
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}
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currentTime = time;
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if ( time < startTime ) {
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return startValue;
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}
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if ( !( extrapolationType & EXTRAPOLATION_NOSTOP ) && ( time > startTime + duration ) ) {
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time = startTime + duration;
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}
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switch( extrapolationType & ~EXTRAPOLATION_NOSTOP ) {
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case EXTRAPOLATION_NONE: {
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deltaTime = ( time - startTime ) * 0.001f;
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currentValue = startValue + deltaTime * baseSpeed;
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break;
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}
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case EXTRAPOLATION_LINEAR: {
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deltaTime = ( time - startTime ) * 0.001f;
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currentValue = startValue + deltaTime * ( baseSpeed + speed );
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break;
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}
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case EXTRAPOLATION_ACCELLINEAR: {
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if ( !duration ) {
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currentValue = startValue;
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} else {
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deltaTime = ( time - startTime ) / duration;
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s = ( 0.5f * deltaTime * deltaTime ) * ( duration * 0.001f );
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currentValue = startValue + deltaTime * baseSpeed + s * speed;
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}
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break;
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}
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case EXTRAPOLATION_DECELLINEAR: {
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if ( !duration ) {
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currentValue = startValue;
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} else {
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deltaTime = ( time - startTime ) / duration;
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s = ( deltaTime - ( 0.5f * deltaTime * deltaTime ) ) * ( duration * 0.001f );
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currentValue = startValue + deltaTime * baseSpeed + s * speed;
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}
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break;
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}
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case EXTRAPOLATION_ACCELSINE: {
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if ( !duration ) {
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currentValue = startValue;
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} else {
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deltaTime = ( time - startTime ) / duration;
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s = ( 1.0f - idMath::Cos( deltaTime * idMath::HALF_PI ) ) * duration * 0.001f * idMath::SQRT_1OVER2;
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currentValue = startValue + deltaTime * baseSpeed + s * speed;
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}
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break;
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}
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case EXTRAPOLATION_DECELSINE: {
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if ( !duration ) {
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currentValue = startValue;
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} else {
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deltaTime = ( time - startTime ) / duration;
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s = idMath::Sin( deltaTime * idMath::HALF_PI ) * duration * 0.001f * idMath::SQRT_1OVER2;
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currentValue = startValue + deltaTime * baseSpeed + s * speed;
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}
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break;
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}
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}
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return currentValue;
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}
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/*
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====================
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idExtrapolate::GetCurrentSpeed
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====================
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*/
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template< class type >
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ID_INLINE type idExtrapolate<type>::GetCurrentSpeed( float time ) const {
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float deltaTime, s;
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if ( time < startTime || !duration ) {
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return ( startValue - startValue );
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}
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if ( !( extrapolationType & EXTRAPOLATION_NOSTOP ) && ( time > startTime + duration ) ) {
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return ( startValue - startValue );
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}
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switch( extrapolationType & ~EXTRAPOLATION_NOSTOP ) {
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case EXTRAPOLATION_NONE: {
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return baseSpeed;
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}
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case EXTRAPOLATION_LINEAR: {
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return baseSpeed + speed;
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}
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case EXTRAPOLATION_ACCELLINEAR: {
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deltaTime = ( time - startTime ) / duration;
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s = deltaTime;
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return baseSpeed + s * speed;
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}
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case EXTRAPOLATION_DECELLINEAR: {
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deltaTime = ( time - startTime ) / duration;
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s = 1.0f - deltaTime;
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return baseSpeed + s * speed;
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}
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case EXTRAPOLATION_ACCELSINE: {
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deltaTime = ( time - startTime ) / duration;
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s = idMath::Sin( deltaTime * idMath::HALF_PI );
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return baseSpeed + s * speed;
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}
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case EXTRAPOLATION_DECELSINE: {
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deltaTime = ( time - startTime ) / duration;
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s = idMath::Cos( deltaTime * idMath::HALF_PI );
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return baseSpeed + s * speed;
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}
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default: {
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return baseSpeed;
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}
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}
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}
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#endif /* !__MATH_EXTRAPOLATE_H__ */
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