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| author | wwylele <wwylele@gmail.com> | 2017-04-17 09:01:45 +0200 |
|---|---|---|
| committer | wwylele <wwylele@gmail.com> | 2017-05-20 12:50:50 +0200 |
| commit | ade45b5b9930b52b6a1d399306539073e8e2196d (patch) | |
| tree | 19fc2c287591990b796530c383a1153f4b8fcda5 /src/common | |
| parent | Merge pull request #2696 from Subv/vfp_revert (diff) | |
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Diffstat (limited to 'src/common')
| -rw-r--r-- | src/common/vector_math.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/common/vector_math.h b/src/common/vector_math.h index 7ca8e15f5..c7a461a1e 100644 --- a/src/common/vector_math.h +++ b/src/common/vector_math.h @@ -652,6 +652,16 @@ static inline decltype((X{} * int{} + X{} * int{}) / base) LerpInt(const X& begi return (begin * (base - t) + end * t) / base; } +// bilinear interpolation. s is for interpolating x00-x01 and x10-x11, and t is for the second +// interpolation. +template <typename X> +inline auto BilinearInterp(const X& x00, const X& x01, const X& x10, const X& x11, const float s, + const float t) { + auto y0 = Lerp(x00, x01, s); + auto y1 = Lerp(x10, x11, s); + return Lerp(y0, y1, t); +} + // Utility vector factories template <typename T> static inline Vec2<T> MakeVec(const T& x, const T& y) { |