Fix operator precedence warnings.

Bug 15387371

Change-Id: I665ee641932d34abb28f150ba036bbbed9fa1431
Reviewed-on: https://swiftshader-review.googlesource.com/4503
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
diff --git a/src/Shader/PixelRoutine.cpp b/src/Shader/PixelRoutine.cpp
index c87f3cb..213a3df 100644
--- a/src/Shader/PixelRoutine.cpp
+++ b/src/Shader/PixelRoutine.cpp
@@ -1406,8 +1406,8 @@
 		}
 
 		int rgbaWriteMask = state.colorWriteActive(index);
-		int bgraWriteMask = rgbaWriteMask & 0x0000000A | (rgbaWriteMask & 0x00000001) << 2 | (rgbaWriteMask & 0x00000004) >> 2;
-		int brgaWriteMask = rgbaWriteMask & 0x00000008 | (rgbaWriteMask & 0x00000001) << 1 | (rgbaWriteMask & 0x00000002) << 1 | (rgbaWriteMask & 0x00000004) >> 2;
+		int bgraWriteMask = (rgbaWriteMask & 0x0000000A) | (rgbaWriteMask & 0x00000001) << 2 | (rgbaWriteMask & 0x00000004) >> 2;
+		int brgaWriteMask = (rgbaWriteMask & 0x00000008) | (rgbaWriteMask & 0x00000001) << 1 | (rgbaWriteMask & 0x00000002) << 1 | (rgbaWriteMask & 0x00000004) >> 2;
 
 		switch(state.targetFormat[index])
 		{