/**
 * @file llcriticaldamp.h
 * @brief A lightweight class that calculates critical damping constants once
 * per frame.
 *
 * $LicenseInfo:firstyear=2002&license=viewergpl$
 *
 * Copyright (c) 2002-2009, Linden Research, Inc.
 *
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
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 * ("Other License"), formally executed by you and Linden Lab.  Terms of
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 */

#ifndef LL_LLCRITICALDAMP_H
#define LL_LLCRITICALDAMP_H

#include <map>

#include "llframetimer.h"

// Purely static class
class LLCriticalDamp
{
	LLCriticalDamp() = delete;
	~LLCriticalDamp() = delete;

public:
	static void updateInterpolants();

	static F32 getInterpolant(F32 time_constant, bool use_cache = true);

protected:
	static std::map<F32, F32> 	sInterpolants;
	// Frame timer for calculating deltas
	static LLFrameTimer			sInternalTimer;
	static F32					sTimeDelta;
};

#endif  // LL_LLCRITICALDAMP_H