From 9e64072b05841782d992010d69f2d12fddde2cde Mon Sep 17 00:00:00 2001
From: Remco Burema <r.burema@ultimaker.com>
Date: Sat, 21 Sep 2019 14:58:59 +0200
Subject: [PATCH] Older drivers can lie w.r.t. GLSL-version if it's forced
 lower.

... so don't use gl_PrimitiveID at all when in compatibility mode. This direct commit partly fixes github #6387 -- but see also the forthcoming PR in Uranium.
---
 resources/shaders/overhang.shader | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/resources/shaders/overhang.shader b/resources/shaders/overhang.shader
index 4a3cd7f6e4..7f1b04dd59 100644
--- a/resources/shaders/overhang.shader
+++ b/resources/shaders/overhang.shader
@@ -60,11 +60,7 @@ fragment =
         highp float NdotR = clamp(dot(viewVector, reflectedLight), 0.0, 1.0);
         finalColor += pow(NdotR, u_shininess) * u_specularColor;
 
-    #if __VERSION__ >= 150
-        finalColor = (u_faceId != gl_PrimitiveID) ? ((-normal.y > u_overhangAngle) ? u_overhangColor : finalColor) : u_faceColor;
-    #else
         finalColor = (-normal.y > u_overhangAngle) ? u_overhangColor : finalColor;
-    #endif
 
         gl_FragColor = finalColor;
         gl_FragColor.a = 1.0;