From fd1da994fa405549abafdbefdcd0a84262dcf83b Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Sat, 12 Jul 2014 16:21:56 -0700
Subject: [PATCH] Fixed bug 2639 - SDL_BLENDMODE_BLEND not working properly for
 software renderer, thanks to Melker Narikka

---
 src/render/software/SDL_draw.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/render/software/SDL_draw.h b/src/render/software/SDL_draw.h
index ba2ec311c..fff462e6d 100644
--- a/src/render/software/SDL_draw.h
+++ b/src/render/software/SDL_draw.h
@@ -51,11 +51,12 @@ do { \
 
 #define DRAW_SETPIXEL_BLEND(getpixel, setpixel) \
 do { \
-    unsigned sr, sg, sb, sa; (void) sa; \
+    unsigned sr, sg, sb, sa; \
     getpixel; \
     sr = DRAW_MUL(inva, sr) + r; \
     sg = DRAW_MUL(inva, sg) + g; \
     sb = DRAW_MUL(inva, sb) + b; \
+    sa = DRAW_MUL(inva, sa) + a; \
     setpixel; \
 } while (0)