From ff0f36f59d58e90e775117beb945ffbec7a5d7e2 Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@redhat.com>
Date: Wed, 2 Mar 2011 09:52:53 +1000
Subject: [PATCH] rgtc: fix fetch function limits for signed types

---
 src/mesa/main/texcompress_rgtc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/mesa/main/texcompress_rgtc.c b/src/mesa/main/texcompress_rgtc.c
index f6a1825216d..dcde4dd5a73 100644
--- a/src/mesa/main/texcompress_rgtc.c
+++ b/src/mesa/main/texcompress_rgtc.c
@@ -364,9 +364,9 @@ static void _fetch_texel_rgtc_s(GLint srcRowStride, const GLbyte *pixdata,
    else if (code < 6)
       decode = ((alpha0 * (6 - code) + (alpha1 * (code - 1))) / 5);
    else if (code == 6)
-      decode = -128;
+      decode = -127;
    else
-      decode = 127;
+      decode = 128;
 
    *value = decode;
 }
-- 
2.30.2