From 4db2ff8fdd5f9db3f74362e9fb6ce67e16fa65a4 Mon Sep 17 00:00:00 2001
From: Mario <mario.mario@y7mail.com>
Date: Sat, 30 May 2020 19:51:00 +1000
Subject: [PATCH] Add some useful lerp lib functions made use of in the
 polytrails branch and in mods

---
 qcsrc/lib/math.qh | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/qcsrc/lib/math.qh b/qcsrc/lib/math.qh
index d8f19906a3..ac23325000 100644
--- a/qcsrc/lib/math.qh
+++ b/qcsrc/lib/math.qh
@@ -71,6 +71,39 @@ vector vsnap(vector point, float fsize)
 	return vret;
 }
 
+ERASEABLE
+float lerpratio(float f0, float f1, float ratio)
+{
+	return f0 * (1 - ratio) + f1 * ratio;
+}
+
+ERASEABLE
+float lerp(float t0, float f0, float t1, float f1, float t)
+{
+	return lerpratio(f0, f1, (t - t0) / (t1 - t0));
+}
+
+ERASEABLE
+float lerp3ratio(float f0, float f1, float f2, float ratio)
+{
+	float mid = 0.5;
+	return ratio < mid ? lerpratio(f0, f1, ratio / mid) : ratio > mid ? lerpratio(f1, f2, (ratio - mid) / mid) : f1;
+}
+
+
+ERASEABLE
+vector lerpvratio(vector f0, vector f1, float ratio)
+{
+	return f0 * (1 - ratio) + f1 * ratio;
+}
+
+ERASEABLE
+vector lerpv3ratio(vector f0, vector f1, vector f2, float ratio)
+{
+	float mid = 0.5;
+	return ratio < mid ? lerpvratio(f0, f1, ratio / mid) : ratio > mid ? lerpvratio(f1, f2, (ratio - mid) / mid) : f1;
+}
+
 ERASEABLE
 vector lerpv(float t0, vector v0, float t1, vector v1, float t)
 {
-- 
2.39.2