From: Mario <mario.mario@y7mail.com>
Date: Sat, 30 May 2020 09:51:00 +0000 (+1000)
Subject: Add some useful lerp lib functions made use of in the polytrails branch and in mods
X-Git-Tag: xonotic-v0.8.5~995
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=4db2ff8fdd5f9db3f74362e9fb6ce67e16fa65a4;p=xonotic%2Fxonotic-data.pk3dir.git

Add some useful lerp lib functions made use of in the polytrails branch and in mods
---

diff --git a/qcsrc/lib/math.qh b/qcsrc/lib/math.qh
index d8f19906a..ac2332500 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)
 {