update u_format_parse from mesa to handle python3

src/gallium/auxiliary/util/u_format_parse.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 
 '''
 /**************************************************************************
@@ -30,6 +29,9 @@
 '''
 
 
+from __future__ import division
+
+
 VOID, UNSIGNED, SIGNED, FIXED, FLOAT = range(5)
 
 SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_W, SWIZZLE_0, SWIZZLE_1, SWIZZLE_NONE, = range(7)
@@ -70,14 +72,20 @@ class Channel:
         return s
 
     def __eq__(self, other):
+        if other is None:
+            return False
+
         return self.type == other.type and self.norm == other.norm and self.pure == other.pure and self.size == other.size
 
+    def __ne__(self, other):
+        return not self == other
+
     def max(self):
         '''Maximum representable number.'''
         if self.type == FLOAT:
             return VERY_LARGE
         if self.type == FIXED:
-            return (1 << (self.size/2)) - 1
+            return (1 << (self.size // 2)) - 1
         if self.norm:
             return 1
         if self.type == UNSIGNED:
@@ -91,7 +99,7 @@ class Channel:
         if self.type == FLOAT:
             return -VERY_LARGE
         if self.type == FIXED:
-            return -(1 << (self.size/2))
+            return -(1 << (self.size // 2))
         if self.type == UNSIGNED:
             return 0
         if self.norm:
@@ -313,7 +321,7 @@ def _parse_channels(fields, layout, colorspace, swizzles):
     return channels
 
 def parse(filename):
-    '''Parse the format descrition in CSV format in terms of the 
+    '''Parse the format description in CSV format in terms of the
     Channel and Format classes above.'''
 
     stream = open(filename)