80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
/**
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* @file llcriticaldamp.h
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* @brief A lightweight class that calculates critical damping constants once
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* per frame.
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*
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* $LicenseInfo:firstyear=2002&license=viewergpl$
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*
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* Copyright (c) 2002-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LL_LLCRITICALDAMP_H
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#define LL_LLCRITICALDAMP_H
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#include <vector>
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#include "llframetimer.h"
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#include "llunits.h"
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class LL_COMMON_API LLSmoothInterpolation
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{
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public:
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LLSmoothInterpolation();
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// MANIPULATORS
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static void updateInterpolants();
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// ACCESSORS
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static F32 getInterpolant(F32SecondsImplicit time_constant, bool use_cache = true);
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template<typename T>
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static T lerp(T a, T b, F32SecondsImplicit time_constant, bool use_cache = true)
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{
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F32 interpolant = getInterpolant(time_constant, use_cache);
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return ((a * (1.f - interpolant))
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+ (b * interpolant));
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}
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protected:
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static F32 calcInterpolant(F32 time_constant);
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struct CompareTimeConstants;
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static LLFrameTimer sInternalTimer; // frame timer for calculating deltas
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struct Interpolant
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{
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F32 mTimeScale;
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F32 mInterpolant;
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};
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typedef std::vector<Interpolant> interpolant_vec_t;
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static interpolant_vec_t sInterpolants;
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static F32 sTimeDelta;
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};
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typedef LLSmoothInterpolation LLCriticalDamp;
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#endif // LL_LLCRITICALDAMP_H
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