From 5b1e42388966958b1fb1451798e30c8f9e48c00b Mon Sep 17 00:00:00 2001
From: glx <glx@openttd.org>
Date: Sun, 4 May 2008 22:32:25 +0000
Subject: (svn r12947) -Fix: keep only first 15 bits for non failed callback
 results

---
 src/newgrf_spritegroup.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src')

diff --git a/src/newgrf_spritegroup.cpp b/src/newgrf_spritegroup.cpp
index b8103ae02..989ee2034 100644
--- a/src/newgrf_spritegroup.cpp
+++ b/src/newgrf_spritegroup.cpp
@@ -204,6 +204,7 @@ static inline const SpriteGroup *ResolveVariable(const SpriteGroup *group, Resol
 
 	if (group->g.determ.num_ranges == 0) {
 		/* nvar == 0 is a special case -- we turn our value into a callback result */
+		if (value != CALLBACK_FAILED) value = GB(value, 0, 15);
 		nvarzero.type = SGT_CALLBACK;
 		nvarzero.g.callback.result = value;
 		return &nvarzero;
-- 
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