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util: Split out channel-parsing Python code

Browse source 
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@linux.vnet.ibm.com>
Signed-off-by: José Fonseca <jfonseca@vmware.com>
This commit is contained in:
Richard Sandiford 2014-03-19 17:10:12 +00:00 • committed by José Fonseca
parent 1a3746212d
commit 6944796cbe
1 changed files with 50 additions and 46 deletions
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96
src/gallium/auxiliary/util/u_format_parse.py
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@ -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: