From 8cbf7bc579e889d627e864ee3da4e2c3ed8f1955 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Theo=20M=C3=BCller?= <theo.paul.mueller@googlemail.com>
Date: Thu, 31 Jan 2019 12:05:05 +0100
Subject: [PATCH] Cubic interpolation for joining graph channels

---
 shaders/graph/1.frag | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/shaders/graph/1.frag b/shaders/graph/1.frag
index 04839d8..9b82d05 100644
--- a/shaders/graph/1.frag
+++ b/shaders/graph/1.frag
@@ -92,7 +92,7 @@ float get_line_height(in sampler1D tex, float idx) {
 
     float fact = clamp((abs((screen.x / 2) - gl_FragCoord.x) / screen.x) * 48, 0.0F, 1.0F);
     #if JOIN_CHANNELS > 0
-    fact = pow(fact, 1.8);  /* To avoid spikes */
+    fact = -2 * pow(fact, 3) + 3 * pow(fact, 2);    /* To avoid spikes */
     s = fact * s + (1 - fact) * middle;
     #else
     s *= fact;