emath: Add quadratic_in_inverse

2026-07-12 09:38:54 +00:00 · 2024-06-07 09:27:32 +08:00
parent 94b15f0593
commit f9df09b53d
1 changed files with 8 additions and 0 deletions
@@ -26,6 +26,14 @@ pub fn quadratic_in(t: f32) -> f32 {
    t * t
 }

+/// Inverse of `quadratic_in`.
+///
+/// This is not the same as `1.0 - quadratic_in(t)`.
+#[inline]
+pub fn quadratic_in_inverse(y: f32) -> f32 {
+    y.sqrt()
+}
+
 /// <https://easings.net/#easeOutQuad>
 ///
 /// Same as `1.0 - quadratic_in(1.0 - t)`.