From a1ef8550d36ba46be929e0078557b01c300e78f6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Fri, 24 Aug 2018 16:58:34 +0200
Subject: [PATCH] Shaders: don't multiply Phong diffuse alpha with light
 intensity.

That messes up with alpha mask (basically, areas that receive less than
50% light get clipped away).
---
 src/Magnum/Shaders/Phong.frag | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Magnum/Shaders/Phong.frag b/src/Magnum/Shaders/Phong.frag
index fbae0d82c..8ac7e9d84 100644
--- a/src/Magnum/Shaders/Phong.frag
+++ b/src/Magnum/Shaders/Phong.frag
@@ -151,13 +151,13 @@ void main() {
 
     /* Add diffuse color */
     lowp float intensity = max(0.0, dot(normalizedTransformedNormal, normalizedLightDirection));
-    color += finalDiffuseColor*lightColor*intensity;
+    color += vec4(finalDiffuseColor.rgb*lightColor.rgb*intensity, lightColor.a*finalDiffuseColor.a);
 
     /* Add specular color, if needed */
     if(intensity > 0.001) {
         highp vec3 reflection = reflect(-normalizedLightDirection, normalizedTransformedNormal);
         mediump float specularity = pow(max(0.0, dot(normalize(cameraDirection), reflection)), shininess);
-        color += finalSpecularColor*specularity;
+        color += vec4(finalSpecularColor.rgb*specularity, finalSpecularColor.a);
     }
 
     #ifdef ALPHA_MASK