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