From e27400de30277c3bd8c3202d6a2d6452c11c9636 Mon Sep 17 00:00:00 2001
From: Alex Szpakowski <slime73@gmail.com>
Date: Wed, 8 Jul 2015 14:21:22 -0300
Subject: [PATCH] The add and subtract blend modes no longer modify the
 destination framebuffer's alpha.

---
 src/modules/graphics/opengl/Graphics.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/modules/graphics/opengl/Graphics.cpp b/src/modules/graphics/opengl/Graphics.cpp
index 46d4d06b4..cd52f805f 100644
--- a/src/modules/graphics/opengl/Graphics.cpp
+++ b/src/modules/graphics/opengl/Graphics.cpp
@@ -945,7 +945,7 @@ void Graphics::setBlendMode(BlendMode mode, bool multiplyalpha)
 		func = GL_FUNC_REVERSE_SUBTRACT;
 	case BLEND_ADD:
 		srcRGB = GL_ONE;
-		srcA = GL_SRC_ALPHA; // FIXME: This isn't correct...
+		srcA = GL_ZERO;
 		dstRGB = dstA = GL_ONE;
 		break;
 	case BLEND_SCREEN: