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#!/usr/bin/env python
'''
/**************************************************************************
*
* Copyright 2009 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
'''
import sys
VOID, UNSIGNED, SIGNED, FIXED, FLOAT = range(5)
SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_W, SWIZZLE_0, SWIZZLE_1, SWIZZLE_NONE, = range(7)
ARITH = 'arith'
ARRAY = 'array'
class Type:
'''Describe the type of a color channel.'''
def __init__(self, kind, norm, size):
self.kind = kind
self.norm = norm
self.size = size
self.sign = kind in (SIGNED, FIXED, FLOAT)
def __str__(self):
s = str(self.kind)
if self.norm:
s += 'n'
s += str(self.size)
return s
def __eq__(self, other):
return self.kind == other.kind and self.norm == other.norm and self.size == other.size
class Format:
'''Describe a pixel format.'''
def __init__(self, name, layout, block_width, block_height, in_types, out_swizzle, colorspace):
self.name = name
self.layout = layout
self.block_width = block_width
self.block_height = block_height
self.in_types = in_types
self.out_swizzle = out_swizzle
self.name = name
self.colorspace = colorspace
def __str__(self):
return self.name
def block_size(self):
size = 0
for type in self.in_types:
size += type.size
return size
def stride(self):
return self.block_size()/8
_kind_parse_map = {
'': VOID,
'x': VOID,
'u': UNSIGNED,
's': SIGNED,
'h': FIXED,
'f': FLOAT,
}
_swizzle_parse_map = {
'x': SWIZZLE_X,
'y': SWIZZLE_Y,
'z': SWIZZLE_Z,
'w': SWIZZLE_W,
'0': SWIZZLE_0,
'1': SWIZZLE_1,
'_': SWIZZLE_NONE,
}
def parse(filename):
'''Parse the format descrition in CSV format in terms of the
Type and Format classes above.'''
stream = open(filename)
formats = []
for line in stream:
line = line.rstrip()
fields = [field.strip() for field in line.split(',')]
name = fields[0]
layout = fields[1]
block_width, block_height = map(int, fields[2:4])
in_types = []
for field in fields[4:8]:
if field:
kind = _kind_parse_map[field[0]]
if field[1] == 'n':
norm = True
size = int(field[2:])
else:
norm = False
size = int(field[1:])
else:
kind = VOID
norm = False
size = 0
in_type = Type(kind, norm, size)
in_types.append(in_type)
out_swizzle = [_swizzle_parse_map[swizzle] for swizzle in fields[8]]
colorspace = fields[9]
formats.append(Format(name, layout, block_width, block_height, in_types, out_swizzle, colorspace))
return formats
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