From 5614906ac4482734e6e670e3c7842f88b40bc417 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Mon, 3 Dec 2018 20:17:11 -0500
Subject: render: blend: Fix additive blending mode.

* chickadee/render/blend.scm (apply-blend-mode): Use the correct
destination blending factor (one, not zero!) for additive blending.
---
 chickadee/render/blend.scm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/chickadee/render/blend.scm b/chickadee/render/blend.scm
index 2e8ebb0..2452ef8 100644
--- a/chickadee/render/blend.scm
+++ b/chickadee/render/blend.scm
@@ -44,7 +44,7 @@
           ('add
            (gl-blend-equation (blend-equation-mode-ext func-add-ext))
            (gl-blend-func (blending-factor-src one)
-                          (blending-factor-dest zero)))
+                          (blending-factor-dest one)))
           ('lighten
            (gl-blend-equation (blend-equation-mode-ext max-ext))
            (gl-blend-func (blending-factor-src one)
-- 
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