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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
Possible License(s): LGPL-2.1 
    

  1. /** 
    2. 

  2.  * @file llsmoothstep.h
    3. 

  3.  * @brief Smoothstep - transition from 0 to 1 - function, first and second derivatives all continuous (smooth)
    4. 

  4.  *
    5. 

  5.  * $LicenseInfo:firstyear=2001&license=viewerlgpl$
    6. 

  6.  * Second Life Viewer Source Code
    7. 

  7.  * Copyright (C) 2010, Linden Research, Inc.
    8. 

  8.  * 
    9. 

  9.  * This library is free software; you can redistribute it and/or
    10. 

  10.  * modify it under the terms of the GNU Lesser General Public
    11. 

  11.  * License as published by the Free Software Foundation;
    12. 

  12.  * version 2.1 of the License only.
    13. 

  13.  * 
    14. 

  14.  * This library is distributed in the hope that it will be useful,
    15. 

  15.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    16. 

  16.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    17. 

  17.  * Lesser General Public License for more details.
    18. 

  18.  * 
    19. 

  19.  * You should have received a copy of the GNU Lesser General Public
    20. 

  20.  * License along with this library; if not, write to the Free Software
    21. 

  21.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
    22. 

  22.  * 
    23. 

  23.  * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
    24. 

  24.  * $/LicenseInfo$
    25. 

  25.  */
    26. 

  26. 

  27. #ifndef LL_LLSMOOTHSTEP_H
    28. 

  28. #define LL_LLSMOOTHSTEP_H
    29. 

  29. 

  30. template <class LLDATATYPE>
    31. 

  31. inline LLDATATYPE llsmoothstep(const LLDATATYPE& edge0, const LLDATATYPE& edge1, const LLDATATYPE& value)
    32. 

  32. {
    33. 

  33.     if (value < edge0)
    34. 

  34. 		return (LLDATATYPE)0;
    35. 

  35. 

  36. 	if (value >= edge1)
    37. 

  37. 		return (LLDATATYPE)1;
    38. 

  38. 

  39. 	// Scale/bias into [0..1] range
    40. 

  40. 	LLDATATYPE scaled_value = (value - edge0) / (edge1 - edge0);
    41. 

  41. 

  42. 	return scaled_value * scaled_value * (3 - 2 * scaled_value);
    43. 

  43. }
    44. 

  44. 

  45. #endif // LL_LLSMOOTHSTEP_H
    46. 

  46.