smoothstep — perform Hermite interpolation between two values
genType smoothstep( | genType edge0, |
| genType edge1, | |
genType x); |
genType smoothstep( | float edge0, |
| float edge1, | |
genType x); |
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.
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);
smoothstep returns 0.0 if x ≤ edge0 and 1.0 if x ≥ edge1.
Results are undefined if edge0 ≥ edge1.
| OpenGL ES Shading Language Version | |||
|---|---|---|---|
| Function Name | 1.00 | 3.00 | 3.10 |
| smoothstep (genType) | ✔ | ✔ | ✔ |
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