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/indra/llcommon/llsmoothstep.h

https://bitbucket.org/lindenlab/viewer-beta/
C++ Header | 45 lines | 13 code | 6 blank | 26 comment | 2 complexity | ba4e9dfe5aa54fe9747b344bad1fc743 MD5 | raw file
 1/** 
 2 * @file llsmoothstep.h
 3 * @brief Smoothstep - transition from 0 to 1 - function, first and second derivatives all continuous (smooth)
 4 *
 5 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 6 * Second Life Viewer Source Code
 7 * Copyright (C) 2010, Linden Research, Inc.
 8 * 
 9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation;
12 * version 2.1 of the License only.
13 * 
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * Lesser General Public License for more details.
18 * 
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
22 * 
23 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
24 * $/LicenseInfo$
25 */
26
27#ifndef LL_LLSMOOTHSTEP_H
28#define LL_LLSMOOTHSTEP_H
29
30template <class LLDATATYPE>
31inline LLDATATYPE llsmoothstep(const LLDATATYPE& edge0, const LLDATATYPE& edge1, const LLDATATYPE& value)
32{
33    if (value < edge0)
34		return (LLDATATYPE)0;
35
36	if (value >= edge1)
37		return (LLDATATYPE)1;
38
39	// Scale/bias into [0..1] range
40	LLDATATYPE scaled_value = (value - edge0) / (edge1 - edge0);
41
42	return scaled_value * scaled_value * (3 - 2 * scaled_value);
43}
44
45#endif // LL_LLSMOOTHSTEP_H