From cf6403ae65c2df8fba8509de28e2c00aa49d98e3 Mon Sep 17 00:00:00 2001
From: Jaiden <56970334+JaidenAlemni@users.noreply.github.com>
Date: Sun, 19 Sep 2021 09:07:21 -0400
Subject: [PATCH] Update glstate.cpp

Fixes the GL blend formula for Subtractive blending
---
 src/glstate.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/glstate.cpp b/src/glstate.cpp
index 83ca4e7..0fbcdc6 100644
--- a/src/glstate.cpp
+++ b/src/glstate.cpp
@@ -84,10 +84,9 @@ 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_ZERO,      GL_ONE);
 		break;
 	}
 }