From 2be34d35b4747ddf223452ae1ce94fbe9c5fc1a2 Mon Sep 17 00:00:00 2001
From: Struma <strix@struma.me>
Date: Thu, 30 Sep 2021 17:27:39 -0400
Subject: [PATCH] Update glstate.cpp
 (https://github.com/Ancurio/mkxp/commit/cf6403ae65c2df8fba8509de28e2c00aa49d98e3)

---
 src/display/gl/glstate.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/display/gl/glstate.cpp b/src/display/gl/glstate.cpp
index 3017bec0..1f56cec2 100644
--- a/src/display/gl/glstate.cpp
+++ b/src/display/gl/glstate.cpp
@@ -75,9 +75,8 @@ void GLBlendMode::apply(const BlendType &value) {
     break;
 
   case BlendSubstraction:
-    // FIXME Alpha calculation is untested
     gl.BlendEquation(GL_FUNC_REVERSE_SUBTRACT);
-    gl.BlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_ONE, GL_ONE);
+    gl.BlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_ZERO, GL_ONE);
     break;
   }
 }