From 3d9545d2e0aee9f6c67867b22cf3fb9b1f708bc6 Mon Sep 17 00:00:00 2001
From: vaxerski <vaxry@vaxry.net>
Date: Fri, 18 Aug 2023 22:07:28 +0200
Subject: [PATCH] shaders: minor premultiplication fixes

---
 src/render/shaders/Border.hpp | 7 +++++--
 src/render/shaders/Shadow.hpp | 4 +---
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/render/shaders/Border.hpp b/src/render/shaders/Border.hpp
index d881dc5b5..4e2d485db 100644
--- a/src/render/shaders/Border.hpp
+++ b/src/render/shaders/Border.hpp
@@ -109,11 +109,14 @@ void main() {
             discard;
     }
 
-    if (pixColor[3] == 0.0)
+    if (additionalAlpha == 0.0)
         discard;
 
     pixColor = getColorForCoord(v_texcoord);
+    pixColor.rgb *= pixColor[3];
 
-    gl_FragColor = pixColor * alpha * additionalAlpha;
+    pixColor *= alpha * additionalAlpha;
+
+    gl_FragColor = pixColor;
 }
 )#";
diff --git a/src/render/shaders/Shadow.hpp b/src/render/shaders/Shadow.hpp
index 49f548d78..2c7b07b28 100644
--- a/src/render/shaders/Shadow.hpp
+++ b/src/render/shaders/Shadow.hpp
@@ -79,9 +79,7 @@ void main() {
     }
 
     // premultiply
-    pixColor[0] *= pixColor[3];
-    pixColor[1] *= pixColor[3];
-    pixColor[2] *= pixColor[3];
+    pixColor.rgb *= pixColor[3];
 
 	gl_FragColor = pixColor;
 })#";