From 7359f9e7581f64f29c592663f114b2c5a888ef4b Mon Sep 17 00:00:00 2001
From: Pavel Krajcevski <pavel@cs.unc.edu>
Date: Tue, 19 Nov 2013 14:54:59 -0500
Subject: [PATCH] Some compilers treat hex literals as unsigned, which causes
 problems

---
 BPTCEncoder/src/BC7Compressor.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/BPTCEncoder/src/BC7Compressor.cpp b/BPTCEncoder/src/BC7Compressor.cpp
index 9586f98..9219118 100755
--- a/BPTCEncoder/src/BC7Compressor.cpp
+++ b/BPTCEncoder/src/BC7Compressor.cpp
@@ -1016,10 +1016,11 @@ double BC7CompressionMode::CompressCluster(
     a2 = std::min(255.0f, std::max(0.0f, a2));
 
     // Quantize
+    const int8 maskSeed = 0x80;
     const uint8 a1b = ::QuantizeChannel(
-      uint8(a1), (0x80 >> (GetAlphaChannelPrecision() - 1)));
+      uint8(a1), (maskSeed >> (GetAlphaChannelPrecision() - 1)));
     const uint8 a2b = ::QuantizeChannel(
-      uint8(a2), (0x80 >> (GetAlphaChannelPrecision() - 1)));
+      uint8(a2), (maskSeed >> (GetAlphaChannelPrecision() - 1)));
 
     // Compute error
     alphaError = 0.0;