From af4a8eb92cd3cd061c60f0ce1f648636ad0cdce8 Mon Sep 17 00:00:00 2001
From: Tommy X <TommyX12@users.noreply.github.com>
Date: Tue, 14 Apr 2015 16:32:01 -0400
Subject: [PATCH] Improve default alpha blending

Change default alpha blending blendFunc to correctly blend alpha for RGBA textures in non-premultiplied alpha mode
---
 legacy/project/src/opengl/OpenGLContext.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/legacy/project/src/opengl/OpenGLContext.cpp b/legacy/project/src/opengl/OpenGLContext.cpp
index 65d15d92b..a204d7610 100644
--- a/legacy/project/src/opengl/OpenGLContext.cpp
+++ b/legacy/project/src/opengl/OpenGLContext.cpp
@@ -496,7 +496,12 @@ public:
                glBlendEquation( GL_FUNC_REVERSE_SUBTRACT);
                break;
             default:
-               glBlendFunc(premAlpha ? GL_ONE : GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
+               if (premAlpha){
+                  glBlendFunc(GL_ONE,GL_ONE_MINUS_SRC_ALPHA);
+               }
+               else {
+                  glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+               }
                glBlendEquation( GL_FUNC_ADD);
          }