427 lines
7.9 KiB
C++
427 lines
7.9 KiB
C++
/**
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* @file llinterp.h
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*
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* $LicenseInfo:firstyear=2001&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#ifndef LL_LLINTERP_H
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#define LL_LLINTERP_H
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#if defined(LL_WINDOWS)
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// macro definitions for common math constants (e.g. M_PI) are declared under the _USE_MATH_DEFINES
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// on Windows system.
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// So, let's define _USE_MATH_DEFINES before including math.h
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#define _USE_MATH_DEFINES
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#endif
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#include "math.h"
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// Class from which different types of interpolators can be derived
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class LLInterpVal
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{
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public:
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virtual ~LLInterpVal() {}
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virtual void interp(LLInterpVal &target, const F32 frac); // Linear interpolation for each type
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};
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template <typename Type>
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class LLInterp
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{
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public:
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LLInterp();
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virtual ~LLInterp() {}
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virtual void start();
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void update(const F32 time);
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const Type &getCurVal() const;
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void setStartVal(const Type &start_val);
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const Type &getStartVal() const;
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void setEndVal(const Type &target_val);
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const Type &getEndVal() const;
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void setStartTime(const F32 time);
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F32 getStartTime() const;
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void setEndTime(const F32 time);
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F32 getEndTime() const;
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BOOL isActive() const;
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BOOL isDone() const;
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protected:
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F32 mStartTime;
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F32 mEndTime;
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F32 mDuration;
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BOOL mActive;
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BOOL mDone;
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Type mStartVal;
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Type mEndVal;
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F32 mCurTime;
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Type mCurVal;
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};
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template <typename Type>
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class LLInterpLinear : public LLInterp<Type>
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{
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public:
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/*virtual*/ void start();
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void update(const F32 time);
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F32 getCurFrac() const;
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protected:
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F32 mCurFrac;
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};
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template <typename Type>
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class LLInterpExp : public LLInterpLinear<Type>
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{
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public:
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void update(const F32 time);
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protected:
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};
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template <typename Type>
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class LLInterpAttractor : public LLInterp<Type>
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{
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public:
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LLInterpAttractor();
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/*virtual*/ void start();
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void setStartVel(const Type &vel);
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void setForce(const F32 force);
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void update(const F32 time);
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protected:
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F32 mForce;
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Type mStartVel;
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Type mVelocity;
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};
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template <typename Type>
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class LLInterpFunc : public LLInterp<Type>
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{
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public:
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LLInterpFunc();
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void update(const F32 time);
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void setFunc(Type (*)(const F32, void *data), void *data);
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protected:
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Type (*mFunc)(const F32 time, void *data);
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void *mData;
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};
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///////////////////////////////////
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//
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// Implementation
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//
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//
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/////////////////////////////////
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//
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// LLInterp base class implementation
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//
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template <typename Type>
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LLInterp<Type>::LLInterp()
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: mStartVal(Type()), mEndVal(Type()), mCurVal(Type())
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{
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mStartTime = 0.f;
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mEndTime = 1.f;
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mDuration = 1.f;
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mCurTime = 0.f;
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mDone = FALSE;
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mActive = FALSE;
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}
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template <class Type>
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void LLInterp<Type>::setStartVal(const Type &start_val)
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{
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mStartVal = start_val;
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}
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template <class Type>
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void LLInterp<Type>::start()
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{
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mCurVal = mStartVal;
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mCurTime = mStartTime;
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mDone = FALSE;
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mActive = FALSE;
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}
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template <class Type>
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const Type &LLInterp<Type>::getStartVal() const
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{
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return mStartVal;
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}
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template <class Type>
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void LLInterp<Type>::setEndVal(const Type &end_val)
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{
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mEndVal = end_val;
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}
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template <class Type>
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const Type &LLInterp<Type>::getEndVal() const
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{
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return mEndVal;
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}
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template <class Type>
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const Type &LLInterp<Type>::getCurVal() const
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{
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return mCurVal;
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}
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template <class Type>
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void LLInterp<Type>::setStartTime(const F32 start_time)
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{
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mStartTime = start_time;
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mDuration = mEndTime - mStartTime;
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}
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template <class Type>
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F32 LLInterp<Type>::getStartTime() const
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{
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return mStartTime;
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}
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template <class Type>
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void LLInterp<Type>::setEndTime(const F32 end_time)
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{
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mEndTime = end_time;
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mDuration = mEndTime - mStartTime;
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}
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template <class Type>
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F32 LLInterp<Type>::getEndTime() const
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{
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return mEndTime;
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}
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template <class Type>
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BOOL LLInterp<Type>::isDone() const
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{
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return mDone;
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}
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template <class Type>
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BOOL LLInterp<Type>::isActive() const
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{
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return mActive;
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}
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//////////////////////////////
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//
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// LLInterpLinear derived class implementation.
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//
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template <typename Type>
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void LLInterpLinear<Type>::start()
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{
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LLInterp<Type>::start();
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mCurFrac = 0.f;
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}
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template <typename Type>
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void LLInterpLinear<Type>::update(const F32 time)
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{
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F32 target_frac = (time - this->mStartTime) / this->mDuration;
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F32 dfrac = target_frac - this->mCurFrac;
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if (target_frac >= 0.f)
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{
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this->mActive = TRUE;
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}
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if (target_frac > 1.f)
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{
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this->mCurVal = this->mEndVal;
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this->mCurFrac = 1.f;
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this->mCurTime = time;
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this->mDone = TRUE;
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return;
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}
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target_frac = llmin(1.f, target_frac);
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target_frac = llmax(0.f, target_frac);
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if (dfrac >= 0.f)
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{
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F32 total_frac = 1.f - this->mCurFrac;
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F32 inc_frac = dfrac / total_frac;
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this->mCurVal = inc_frac * this->mEndVal + (1.f - inc_frac) * this->mCurVal;
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this->mCurTime = time;
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}
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else
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{
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F32 total_frac = this->mCurFrac - 1.f;
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F32 inc_frac = dfrac / total_frac;
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this->mCurVal = inc_frac * this->mStartVal + (1.f - inc_frac) * this->mCurVal;
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this->mCurTime = time;
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}
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mCurFrac = target_frac;
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}
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template <class Type>
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F32 LLInterpLinear<Type>::getCurFrac() const
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{
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return mCurFrac;
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}
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//////////////////////////////
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//
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// LLInterpAttractor derived class implementation.
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//
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template <class Type>
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LLInterpAttractor<Type>::LLInterpAttractor() : LLInterp<Type>()
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{
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mForce = 0.1f;
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mVelocity *= 0.f;
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mStartVel *= 0.f;
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}
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template <class Type>
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void LLInterpAttractor<Type>::start()
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{
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LLInterp<Type>::start();
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mVelocity = mStartVel;
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}
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template <class Type>
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void LLInterpAttractor<Type>::setStartVel(const Type &vel)
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{
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mStartVel = vel;
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}
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template <class Type>
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void LLInterpAttractor<Type>::setForce(const F32 force)
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{
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mForce = force;
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}
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template <class Type>
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void LLInterpAttractor<Type>::update(const F32 time)
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{
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if (time > this->mStartTime)
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{
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this->mActive = TRUE;
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}
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else
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{
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return;
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}
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if (time > this->mEndTime)
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{
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this->mDone = TRUE;
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return;
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}
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F32 dt = time - this->mCurTime;
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Type dist_val = this->mEndVal - this->mCurVal;
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Type dv = 0.5*dt*dt*this->mForce*dist_val;
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this->mVelocity += dv;
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this->mCurVal += this->mVelocity * dt;
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this->mCurTime = time;
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}
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//////////////////////////////
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//
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// LLInterpFucn derived class implementation.
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//
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template <class Type>
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LLInterpFunc<Type>::LLInterpFunc() : LLInterp<Type>()
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{
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mFunc = NULL;
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mData = NULL;
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}
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template <class Type>
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void LLInterpFunc<Type>::setFunc(Type (*func)(const F32, void *data), void *data)
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{
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mFunc = func;
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mData = data;
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}
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template <class Type>
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void LLInterpFunc<Type>::update(const F32 time)
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{
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if (time > this->mStartTime)
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{
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this->mActive = TRUE;
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}
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else
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{
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return;
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}
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if (time > this->mEndTime)
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{
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this->mDone = TRUE;
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return;
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}
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this->mCurVal = (*mFunc)(time - this->mStartTime, mData);
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this->mCurTime = time;
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}
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//////////////////////////////
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//
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// LLInterpExp derived class implementation.
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//
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template <class Type>
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void LLInterpExp<Type>::update(const F32 time)
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{
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F32 target_frac = (time - this->mStartTime) / this->mDuration;
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if (target_frac >= 0.f)
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{
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this->mActive = TRUE;
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}
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if (target_frac > 1.f)
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{
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this->mCurVal = this->mEndVal;
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this->mCurFrac = 1.f;
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this->mCurTime = time;
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this->mDone = TRUE;
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return;
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}
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this->mCurFrac = 1.f - (F32)(exp(-2.f*target_frac));
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this->mCurVal = this->mStartVal + this->mCurFrac * (this->mEndVal - this->mStartVal);
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this->mCurTime = time;
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}
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#endif // LL_LLINTERP_H
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