llinterp.h
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- /**
- * @file llinterp.h
- *
- * $LicenseInfo:firstyear=2001&license=viewergpl$
- *
- * Copyright (c) 2001-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * The source code in this file ("Source Code") is provided by Linden Lab
- * to you under the terms of the GNU General Public License, version 2.0
- * ("GPL"), unless you have obtained a separate licensing agreement
- * ("Other License"), formally executed by you and Linden Lab. Terms of
- * the GPL can be found in doc/GPL-license.txt in this distribution, or
- * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
- *
- * There are special exceptions to the terms and conditions of the GPL as
- * it is applied to this Source Code. View the full text of the exception
- * in the file doc/FLOSS-exception.txt in this software distribution, or
- * online at
- * http://secondlifegrid.net/programs/open_source/licensing/flossexception
- *
- * By copying, modifying or distributing this software, you acknowledge
- * that you have read and understood your obligations described above,
- * and agree to abide by those obligations.
- *
- * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
- * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
- * COMPLETENESS OR PERFORMANCE.
- * $/LicenseInfo$
- */
- #ifndef LL_LLINTERP_H
- #define LL_LLINTERP_H
- #if defined(LL_WINDOWS)
- // macro definitions for common math constants (e.g. M_PI) are declared under the _USE_MATH_DEFINES
- // on Windows system.
- // So, let's define _USE_MATH_DEFINES before including math.h
- #define _USE_MATH_DEFINES
- #endif
- #include "math.h"
- // Class from which different types of interpolators can be derived
- class LLInterpVal
- {
- public:
- virtual ~LLInterpVal() {}
- virtual void interp(LLInterpVal &target, const F32 frac); // Linear interpolation for each type
- };
- template <typename Type>
- class LLInterp
- {
- public:
- LLInterp();
- virtual ~LLInterp() {}
- virtual void start();
- void update(const F32 time);
- const Type &getCurVal() const;
- void setStartVal(const Type &start_val);
- const Type &getStartVal() const;
- void setEndVal(const Type &target_val);
- const Type &getEndVal() const;
- void setStartTime(const F32 time);
- F32 getStartTime() const;
- void setEndTime(const F32 time);
- F32 getEndTime() const;
- BOOL isActive() const;
- BOOL isDone() const;
-
- protected:
- F32 mStartTime;
- F32 mEndTime;
- F32 mDuration;
- BOOL mActive;
- BOOL mDone;
- Type mStartVal;
- Type mEndVal;
- F32 mCurTime;
- Type mCurVal;
- };
- template <typename Type>
- class LLInterpLinear : public LLInterp<Type>
- {
- public:
- /*virtual*/ void start();
- void update(const F32 time);
- F32 getCurFrac() const;
- protected:
- F32 mCurFrac;
- };
- template <typename Type>
- class LLInterpExp : public LLInterpLinear<Type>
- {
- public:
- void update(const F32 time);
- protected:
- };
- template <typename Type>
- class LLInterpAttractor : public LLInterp<Type>
- {
- public:
- LLInterpAttractor();
- /*virtual*/ void start();
- void setStartVel(const Type &vel);
- void setForce(const F32 force);
- void update(const F32 time);
- protected:
- F32 mForce;
- Type mStartVel;
- Type mVelocity;
- };
- template <typename Type>
- class LLInterpFunc : public LLInterp<Type>
- {
- public:
- LLInterpFunc();
- void update(const F32 time);
- void setFunc(Type (*)(const F32, void *data), void *data);
- protected:
- Type (*mFunc)(const F32 time, void *data);
- void *mData;
- };
- ///////////////////////////////////
- //
- // Implementation
- //
- //
- /////////////////////////////////
- //
- // LLInterp base class implementation
- //
- template <typename Type>
- LLInterp<Type>::LLInterp()
- : mStartVal(Type()), mEndVal(Type()), mCurVal(Type())
- {
- mStartTime = 0.f;
- mEndTime = 1.f;
- mDuration = 1.f;
- mCurTime = 0.f;
- mDone = FALSE;
- mActive = FALSE;
- }
- template <class Type>
- void LLInterp<Type>::setStartVal(const Type &start_val)
- {
- mStartVal = start_val;
- }
- template <class Type>
- void LLInterp<Type>::start()
- {
- mCurVal = mStartVal;
- mCurTime = mStartTime;
- mDone = FALSE;
- mActive = FALSE;
- }
- template <class Type>
- const Type &LLInterp<Type>::getStartVal() const
- {
- return mStartVal;
- }
- template <class Type>
- void LLInterp<Type>::setEndVal(const Type &end_val)
- {
- mEndVal = end_val;
- }
- template <class Type>
- const Type &LLInterp<Type>::getEndVal() const
- {
- return mEndVal;
- }
- template <class Type>
- const Type &LLInterp<Type>::getCurVal() const
- {
- return mCurVal;
- }
- template <class Type>
- void LLInterp<Type>::setStartTime(const F32 start_time)
- {
- mStartTime = start_time;
- mDuration = mEndTime - mStartTime;
- }
- template <class Type>
- F32 LLInterp<Type>::getStartTime() const
- {
- return mStartTime;
- }
- template <class Type>
- void LLInterp<Type>::setEndTime(const F32 end_time)
- {
- mEndTime = end_time;
- mDuration = mEndTime - mStartTime;
- }
- template <class Type>
- F32 LLInterp<Type>::getEndTime() const
- {
- return mEndTime;
- }
- template <class Type>
- BOOL LLInterp<Type>::isDone() const
- {
- return mDone;
- }
- template <class Type>
- BOOL LLInterp<Type>::isActive() const
- {
- return mActive;
- }
- //////////////////////////////
- //
- // LLInterpLinear derived class implementation.
- //
- template <typename Type>
- void LLInterpLinear<Type>::start()
- {
- LLInterp<Type>::start();
- mCurFrac = 0.f;
- }
- template <typename Type>
- void LLInterpLinear<Type>::update(const F32 time)
- {
- F32 target_frac = (time - this->mStartTime) / this->mDuration;
- F32 dfrac = target_frac - this->mCurFrac;
- if (target_frac >= 0.f)
- {
- this->mActive = TRUE;
- }
-
- if (target_frac > 1.f)
- {
- this->mCurVal = this->mEndVal;
- this->mCurFrac = 1.f;
- this->mCurTime = time;
- this->mDone = TRUE;
- return;
- }
- target_frac = llmin(1.f, target_frac);
- target_frac = llmax(0.f, target_frac);
- if (dfrac >= 0.f)
- {
- F32 total_frac = 1.f - this->mCurFrac;
- F32 inc_frac = dfrac / total_frac;
- this->mCurVal = inc_frac * this->mEndVal + (1.f - inc_frac) * this->mCurVal;
- this->mCurTime = time;
- }
- else
- {
- F32 total_frac = this->mCurFrac - 1.f;
- F32 inc_frac = dfrac / total_frac;
- this->mCurVal = inc_frac * this->mStartVal + (1.f - inc_frac) * this->mCurVal;
- this->mCurTime = time;
- }
- mCurFrac = target_frac;
- }
- template <class Type>
- F32 LLInterpLinear<Type>::getCurFrac() const
- {
- return mCurFrac;
- }
- //////////////////////////////
- //
- // LLInterpAttractor derived class implementation.
- //
- template <class Type>
- LLInterpAttractor<Type>::LLInterpAttractor() : LLInterp<Type>()
- {
- mForce = 0.1f;
- mVelocity *= 0.f;
- mStartVel *= 0.f;
- }
- template <class Type>
- void LLInterpAttractor<Type>::start()
- {
- LLInterp<Type>::start();
- mVelocity = mStartVel;
- }
- template <class Type>
- void LLInterpAttractor<Type>::setStartVel(const Type &vel)
- {
- mStartVel = vel;
- }
- template <class Type>
- void LLInterpAttractor<Type>::setForce(const F32 force)
- {
- mForce = force;
- }
- template <class Type>
- void LLInterpAttractor<Type>::update(const F32 time)
- {
- if (time > this->mStartTime)
- {
- this->mActive = TRUE;
- }
- else
- {
- return;
- }
- if (time > this->mEndTime)
- {
- this->mDone = TRUE;
- return;
- }
- F32 dt = time - this->mCurTime;
- Type dist_val = this->mEndVal - this->mCurVal;
- Type dv = 0.5*dt*dt*this->mForce*dist_val;
- this->mVelocity += dv;
- this->mCurVal += this->mVelocity * dt;
- this->mCurTime = time;
- }
- //////////////////////////////
- //
- // LLInterpFucn derived class implementation.
- //
- template <class Type>
- LLInterpFunc<Type>::LLInterpFunc() : LLInterp<Type>()
- {
- mFunc = NULL;
- mData = NULL;
- }
- template <class Type>
- void LLInterpFunc<Type>::setFunc(Type (*func)(const F32, void *data), void *data)
- {
- mFunc = func;
- mData = data;
- }
- template <class Type>
- void LLInterpFunc<Type>::update(const F32 time)
- {
- if (time > this->mStartTime)
- {
- this->mActive = TRUE;
- }
- else
- {
- return;
- }
- if (time > this->mEndTime)
- {
- this->mDone = TRUE;
- return;
- }
- this->mCurVal = (*mFunc)(time - this->mStartTime, mData);
- this->mCurTime = time;
- }
- //////////////////////////////
- //
- // LLInterpExp derived class implementation.
- //
- template <class Type>
- void LLInterpExp<Type>::update(const F32 time)
- {
- F32 target_frac = (time - this->mStartTime) / this->mDuration;
- if (target_frac >= 0.f)
- {
- this->mActive = TRUE;
- }
-
- if (target_frac > 1.f)
- {
- this->mCurVal = this->mEndVal;
- this->mCurFrac = 1.f;
- this->mCurTime = time;
- this->mDone = TRUE;
- return;
- }
- this->mCurFrac = 1.f - (F32)(exp(-2.f*target_frac));
- this->mCurVal = this->mStartVal + this->mCurFrac * (this->mEndVal - this->mStartVal);
- this->mCurTime = time;
- }
- #endif // LL_LLINTERP_H