smoothstep - perform Hermite interpolation between two values

Copyright

       Copyright © 2011-2014 Khronos Group

[FIXME: source]                                    11/18/2024                                     SMOOTHSTEP(3G)

Declaration

genTypesmoothstep(genTypeedge0,genTypeedge1,genTypex);genTypesmoothstep(floatedge0,floatedge1,genTypex);genDTypesmoothstep(genDTypeedge0,genDTypeedge1,genDTypex);genDTypesmoothstep(doubleedge0,doubleedge1,genDTypex);

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.

Name

       smoothstep - perform Hermite interpolation between two values

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.

Version Support

       ┌────────────┬───────────────────────────────────────────────────────────────────────────────────┐
       │            │        OpenGLShadingLanguageVersion                                            │
       ├────────────┼──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┤
       │ Function   │ 1.10 │ 1.20 │ 1.30 │ 1.40 │ 1.50 │ 3.30 │ 4.00 │ 4.10 │ 4.20 │ 4.30 │ 4.40 │ 4.50 │
       │ Name       │      │      │      │      │      │      │      │      │      │      │      │      │
       ├────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │ smoothstep │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       │ (genType)  │      │      │      │      │      │      │      │      │      │      │      │      │
       ├────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │ smoothstep │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       │ (genDType) │      │      │      │      │      │      │      │      │      │      │      │      │
       └────────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘