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SMOOTHSTEP(3G) [FIXME: manual] SMOOTHSTEP(3G)

NAME

smoothstep - perform Hermite interpolation between two values

DECLARATION

genType smoothstep(genType edge0, genType edge1, genType x);

genType smoothstep(float edge0, float edge1, genType x);

genDType smoothstep(genDType edge0, genDType edge1, genDType x);

genDType smoothstep(double edge0, double edge1, genDType x);

PARAMETERS

edge0
Specifies the value of the lower edge of the Hermite function.

edge1

Specifies the value of the upper edge of the Hermite function.

x

Specifies the source value for interpolation.

DESCRIPTION

smoothstep performs smooth Hermite interpolation between 0 and 1 when edge0 < x < edge1. This is useful in cases where a threshold function with a smooth transition is desired. smoothstep is equivalent to: 

    genType t;  /* Or genDType t; */
    t = clamp((x - edge0) / (edge1 - edge0), 0.0, 1.0);
    return t * t * (3.0 - 2.0 * t);

Results are undefined if edge0 ≥ edge1.

VERSION SUPPORT

OpenGL Shading Language Version
Function Name 1.10 1.20 1.30 1.40 1.50 3.30 4.00 4.10 4.20 4.30 4.40 4.50
smoothstep (genType) - - ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
smoothstep (genDType) - - - - - - ✔ ✔ ✔ ✔ ✔ ✔

SEE ALSO

mix(), step()

COPYRIGHT

Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.

COPYRIGHT

Copyright © 2011-2014 Khronos Group
05/21/2015 [FIXME: source]