Mesa (master): util: Split out channel-parsing Python code

[Jose Fonseca]

Module: Mesa
Branch: master
Commit: 6944796cbe880311e920745d5aa0a793cf76e30a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=6944796cbe880311e920745d5aa0a793cf76e30a

Author: Richard Sandiford <rsandifo at linux.vnet.ibm.com>
Date:   Wed Mar 19 17:10:12 2014 +0000

util: Split out channel-parsing Python code

Splits out the code that parses the channel list, so that we
can have different lists for little and big endian.

There is no change to the generated u_format_table.c.

Signed-off-by: Richard Sandiford <rsandifo at linux.vnet.ibm.com>
Signed-off-by: José Fonseca <jfonseca at vmware.com>

---

 src/gallium/auxiliary/util/u_format_parse.py |   96 ++++++++++++++------------
 1 file changed, 50 insertions(+), 46 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_format_parse.py b/src/gallium/auxiliary/util/u_format_parse.py
index 08c55c1..9f6ac36 100755
--- a/src/gallium/auxiliary/util/u_format_parse.py
+++ b/src/gallium/auxiliary/util/u_format_parse.py
@@ -267,6 +267,54 @@ _swizzle_parse_map = {
     '_': SWIZZLE_NONE,
 }
 
+def _parse_channels(fields, layout, colorspace, swizzles):
+    if layout == PLAIN:
+        names = ['']*4
+        if colorspace in (RGB, SRGB):
+            for i in range(4):
+                swizzle = swizzles[i]
+                if swizzle < 4:
+                    names[swizzle] += 'rgba'[i]
+        elif colorspace == ZS:
+            for i in range(4):
+                swizzle = swizzles[i]
+                if swizzle < 4:
+                    names[swizzle] += 'zs'[i]
+        else:
+            assert False
+        for i in range(4):
+            if names[i] == '':
+                names[i] = 'x'
+    else:
+        names = ['x', 'y', 'z', 'w']
+
+    channels = []
+    for i in range(0, 4):
+        field = fields[i]
+        if field:
+            type = _type_parse_map[field[0]]
+            if field[1] == 'n':
+                norm = True
+                pure = False
+                size = int(field[2:])
+            elif field[1] == 'p':
+                pure = True
+                norm = False
+                size = int(field[2:])
+            else:
+                norm = False
+                pure = False
+                size = int(field[1:])
+        else:
+            type = VOID
+            norm = False
+            pure = False
+            size = 0
+        channel = Channel(type, norm, pure, size, names[i])
+        channels.append(channel)
+
+    return channels
+
 def parse(filename):
     '''Parse the format descrition in CSV format in terms of the 
     Channel and Format classes above.'''
@@ -289,54 +337,10 @@ def parse(filename):
         name = fields[0]
         layout = fields[1]
         block_width, block_height = map(int, fields[2:4])
+        colorspace = fields[9]
 
         swizzles = [_swizzle_parse_map[swizzle] for swizzle in fields[8]]
-        colorspace = fields[9]
-        
-        if layout == PLAIN:
-            names = ['']*4
-            if colorspace in (RGB, SRGB):
-                for i in range(4):
-                    swizzle = swizzles[i]
-                    if swizzle < 4:
-                        names[swizzle] += 'rgba'[i]
-            elif colorspace == ZS:
-                for i in range(4):
-                    swizzle = swizzles[i]
-                    if swizzle < 4:
-                        names[swizzle] += 'zs'[i]
-            else:
-                assert False
-            for i in range(4):
-                if names[i] == '':
-                    names[i] = 'x'
-        else:
-            names = ['x', 'y', 'z', 'w']
-
-        channels = []
-        for i in range(0, 4):
-            field = fields[4 + i]
-            if field:
-                type = _type_parse_map[field[0]]
-                if field[1] == 'n':
-                    norm = True
-                    pure = False
-                    size = int(field[2:])
-                elif field[1] == 'p':
-                    pure = True
-                    norm = False
-                    size = int(field[2:])
-                else:
-                    norm = False
-                    pure = False
-                    size = int(field[1:])
-            else:
-                type = VOID
-                norm = False
-                pure = False
-                size = 0
-            channel = Channel(type, norm, pure, size, names[i])
-            channels.append(channel)
+        channels = _parse_channels(fields[4:8], layout, colorspace, swizzles)
 
         shift = 0
         for channel in channels[3::-1] if is_big_endian else channels: