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Added invSmoothStep.

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This commit is contained in:
Бранимир Караџић
2020-12-20 11:06:55 -08:00
parent 7837d90865
commit 279b8ff3c0
2 changed files with 8 additions and 0 deletions
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5
include/bx/inline/math.inl
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@@ -344,6 +344,11 @@ namespace bx
return square(_a)*(3.0f - 2.0f*_a);
}
inline BX_CONST_FUNC float invSmoothStep(float _a)
{
return 0.5f - sin(asin(1.0f - 2.0f * _a) / 3.0f);
}
inline BX_CONSTEXPR_FUNC float bias(float _time, float _bias)
{
return _time / ( ( (1.0f/_bias - 2.0f)*(1.0f - _time) ) + 1.0f);

3
include/bx/math.h
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@@ -282,6 +282,9 @@ namespace bx
///
BX_CONSTEXPR_FUNC float smoothStep(float _a);
///
BX_CONST_FUNC float invSmoothStep(float _a);
///
BX_CONSTEXPR_FUNC float bias(float _time, float _bias);