From 7ed59503d63c0a531f5f1d361d58be96c1d23410 Mon Sep 17 00:00:00 2001
From: Remco Burema <r.burema@ultimaker.com>
Date: Wed, 22 Apr 2020 11:49:27 +0200
Subject: [PATCH] Round doesn't work for OpenGL 2.1 because it was only added
 in glsl 130.

So mad at myself right now >:-(
Part of the further fallout of CURA-7147
---
 resources/shaders/overhang.shader | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/resources/shaders/overhang.shader b/resources/shaders/overhang.shader
index 8457158bc7..c3106a4e14 100644
--- a/resources/shaders/overhang.shader
+++ b/resources/shaders/overhang.shader
@@ -70,7 +70,7 @@ fragment =
 
         if(u_renderError > 0.5)
         {
-            vec3 grid = vec3(f_vertex.x - round(f_vertex.x), f_vertex.y - round(f_vertex.y), f_vertex.z - round(f_vertex.z));
+            vec3 grid = vec3(f_vertex.x - floor(f_vertex.x - 0.5), f_vertex.y - floor(f_vertex.y - 0.5), f_vertex.z - floor(f_vertex.z - 0.5));
             finalColor.a = dot(grid, grid) < 0.245 ? 0.667 : 1.0;
         }
         gl_FragColor = finalColor;