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-rw-r--r--src/common/vector_math.h10
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) {