Mesa (master): rgtc: fix fetch function limits for signed types

[Dave Airlie]

Module: Mesa
Branch: master
Commit: ff0f36f59d58e90e775117beb945ffbec7a5d7e2
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ff0f36f59d58e90e775117beb945ffbec7a5d7e2

Author: Dave Airlie <airlied at redhat.com>
Date:   Wed Mar  2 09:52:53 2011 +1000

rgtc: fix fetch function limits for signed types

---

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

diff --git a/src/mesa/main/texcompress_rgtc.c b/src/mesa/main/texcompress_rgtc.c
index f6a1825..dcde4dd 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;
 }