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/**
* @file llsmoothstep.h
* @brief Smoothstep - transition from 0 to 1 - function, first and second derivatives all continuous (smooth)
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLSMOOTHSTEP_H
#define LL_LLSMOOTHSTEP_H
template <class LLDATATYPE>
inline LLDATATYPE llsmoothstep(const LLDATATYPE& edge0, const LLDATATYPE& edge1, const LLDATATYPE& value)
{
if (value < edge0)
return (LLDATATYPE)0;
if (value >= edge1)
return (LLDATATYPE)1;
// Scale/bias into [0..1] range
LLDATATYPE scaled_value = (value - edge0) / (edge1 - edge0);
return scaled_value * scaled_value * (3 - 2 * scaled_value);
}
#endif // LL_LLSMOOTHSTEP_H
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