reactos/dll/opengl/mesa/src/gallium/auxiliary/util/u_format_parse.py

   1 #!/usr/bin/env python
   2
   3 '''
   4 /**************************************************************************
   5  *
   6  * Copyright 2009 VMware, Inc.
   7  * All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the
  11  * "Software"), to deal in the Software without restriction, including
  12  * without limitation the rights to use, copy, modify, merge, publish,
  13  * distribute, sub license, and/or sell copies of the Software, and to
  14  * permit persons to whom the Software is furnished to do so, subject to
  15  * the following conditions:
  16  *
  17  * The above copyright notice and this permission notice (including the
  18  * next paragraph) shall be included in all copies or substantial portions
  19  * of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  22  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  24  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  25  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  26  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  27  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28  *
  29  **************************************************************************/
  30 '''
  31
  32
  33 VOID, UNSIGNED, SIGNED, FIXED, FLOAT = range(5)
  34
  35 SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_W, SWIZZLE_0, SWIZZLE_1, SWIZZLE_NONE, = range(7)
  36
  37 PLAIN = 'plain'
  38
  39 RGB = 'rgb'
  40 SRGB = 'srgb'
  41 YUV = 'yuv'
  42 ZS = 'zs'
  43
  44
  45 def is_pot(x):
  46    return (x & (x - 1)) == 0
  47
  48
  49 VERY_LARGE = 99999999999999999999999
  50
  51
  52 class Channel:
  53     '''Describe the channel of a color channel.'''
  54
  55     def __init__(self, type, norm, pure, size, name = ''):
  56         self.type = type
  57         self.norm = norm
  58         self.pure = pure
  59         self.size = size
  60         self.sign = type in (SIGNED, FIXED, FLOAT)
  61         self.name = name
  62
  63     def __str__(self):
  64         s = str(self.type)
  65         if self.norm:
  66             s += 'n'
  67         if self.pure:
  68             s += 'p'
  69         s += str(self.size)
  70         return s
  71
  72     def __eq__(self, other):
  73         return self.type == other.type and self.norm == other.norm and self.pure == other.pure and self.size == other.size
  74
  75     def max(self):
  76         '''Maximum representable number.'''
  77         if self.type == FLOAT:
  78             return VERY_LARGE
  79         if self.type == FIXED:
  80             return (1 << (self.size/2)) - 1
  81         if self.norm:
  82             return 1
  83         if self.type == UNSIGNED:
  84             return (1 << self.size) - 1
  85         if self.type == SIGNED:
  86             return (1 << (self.size - 1)) - 1
  87         assert False
  88
  89     def min(self):
  90         '''Minimum representable number.'''
  91         if self.type == FLOAT:
  92             return -VERY_LARGE
  93         if self.type == FIXED:
  94             return -(1 << (self.size/2))
  95         if self.type == UNSIGNED:
  96             return 0
  97         if self.norm:
  98             return -1
  99         if self.type == SIGNED:
 100             return -(1 << (self.size - 1))
 101         assert False
 102
 103
 104 class Format:
 105     '''Describe a pixel format.'''
 106
 107     def __init__(self, name, layout, block_width, block_height, channels, swizzles, colorspace):
 108         self.name = name
 109         self.layout = layout
 110         self.block_width = block_width
 111         self.block_height = block_height
 112         self.channels = channels
 113         self.swizzles = swizzles
 114         self.name = name
 115         self.colorspace = colorspace
 116
 117     def __str__(self):
 118         return self.name
 119
 120     def short_name(self):
 121         '''Make up a short norm for a format, suitable to be used as suffix in
 122         function names.'''
 123
 124         name = self.name
 125         if name.startswith('PIPE_FORMAT_'):
 126             name = name[len('PIPE_FORMAT_'):]
 127         name = name.lower()
 128         return name
 129
 130     def block_size(self):
 131         size = 0
 132         for channel in self.channels:
 133             size += channel.size
 134         return size
 135
 136     def nr_channels(self):
 137         nr_channels = 0
 138         for channel in self.channels:
 139             if channel.size:
 140                 nr_channels += 1
 141         return nr_channels
 142
 143     def is_array(self):
 144         if self.layout != PLAIN:
 145             return False
 146         ref_channel = self.channels[0]
 147         for channel in self.channels[1:]:
 148             if channel.size and (channel.size != ref_channel.size or channel.size % 8):
 149                 return False
 150         return True
 151
 152     def is_mixed(self):
 153         if self.layout != PLAIN:
 154             return False
 155         ref_channel = self.channels[0]
 156         if ref_channel.type == VOID:
 157            ref_channel = self.channels[1]
 158         for channel in self.channels[1:]:
 159             if channel.type != VOID:
 160                 if channel.type != ref_channel.type:
 161                     return True
 162                 if channel.norm != ref_channel.norm:
 163                     return True
 164                 if channel.pure != ref_channel.pure:
 165                     return True
 166         return False
 167
 168     def is_pot(self):
 169         return is_pot(self.block_size())
 170
 171     def is_int(self):
 172         if self.layout != PLAIN:
 173             return False
 174         for channel in self.channels:
 175             if channel.type not in (VOID, UNSIGNED, SIGNED):
 176                 return False
 177         return True
 178
 179     def is_float(self):
 180         if self.layout != PLAIN:
 181             return False
 182         for channel in self.channels:
 183             if channel.type not in (VOID, FLOAT):
 184                 return False
 185         return True
 186
 187     def is_bitmask(self):
 188         if self.layout != PLAIN:
 189             return False
 190         if self.block_size() not in (8, 16, 32):
 191             return False
 192         for channel in self.channels:
 193             if channel.type not in (VOID, UNSIGNED, SIGNED):
 194                 return False
 195         return True
 196
 197     def inv_swizzles(self):
 198         '''Return an array[4] of inverse swizzle terms'''
 199         '''Only pick the first matching value to avoid l8 getting blue and i8 getting alpha'''
 200         inv_swizzle = [None]*4
 201         for i in range(4):
 202             swizzle = self.swizzles[i]
 203             if swizzle < 4 and inv_swizzle[swizzle] == None:
 204                 inv_swizzle[swizzle] = i
 205         return inv_swizzle
 206
 207     def stride(self):
 208         return self.block_size()/8
 209
 210
 211 _type_parse_map = {
 212     '':  VOID,
 213     'x': VOID,
 214     'u': UNSIGNED,
 215     's': SIGNED,
 216     'h': FIXED,
 217     'f': FLOAT,
 218 }
 219
 220 _swizzle_parse_map = {
 221     'x': SWIZZLE_X,
 222     'y': SWIZZLE_Y,
 223     'z': SWIZZLE_Z,
 224     'w': SWIZZLE_W,
 225     '0': SWIZZLE_0,
 226     '1': SWIZZLE_1,
 227     '_': SWIZZLE_NONE,
 228 }
 229
 230 def parse(filename):
 231     '''Parse the format descrition in CSV format in terms of the
 232     Channel and Format classes above.'''
 233
 234     stream = open(filename)
 235     formats = []
 236     for line in stream:
 237         try:
 238             comment = line.index('#')
 239         except ValueError:
 240             pass
 241         else:
 242             line = line[:comment]
 243         line = line.strip()
 244         if not line:
 245             continue
 246
 247         fields = [field.strip() for field in line.split(',')]
 248
 249         name = fields[0]
 250         layout = fields[1]
 251         block_width, block_height = map(int, fields[2:4])
 252
 253         swizzles = [_swizzle_parse_map[swizzle] for swizzle in fields[8]]
 254         colorspace = fields[9]
 255
 256         if layout == PLAIN:
 257             names = ['']*4
 258             if colorspace in (RGB, SRGB):
 259                 for i in range(4):
 260                     swizzle = swizzles[i]
 261                     if swizzle < 4:
 262                         names[swizzle] += 'rgba'[i]
 263             elif colorspace == ZS:
 264                 for i in range(4):
 265                     swizzle = swizzles[i]
 266                     if swizzle < 4:
 267                         names[swizzle] += 'zs'[i]
 268             else:
 269                 assert False
 270             for i in range(4):
 271                 if names[i] == '':
 272                     names[i] = 'x'
 273         else:
 274             names = ['x', 'y', 'z', 'w']
 275
 276         channels = []
 277         for i in range(0, 4):
 278             field = fields[4 + i]
 279             if field:
 280                 type = _type_parse_map[field[0]]
 281                 if field[1] == 'n':
 282                     norm = True
 283                     pure = False
 284                     size = int(field[2:])
 285                 elif field[1] == 'p':
 286                     pure = True
 287                     norm = False
 288                     size = int(field[2:])
 289                 else:
 290                     norm = False
 291                     pure = False
 292                     size = int(field[1:])
 293             else:
 294                 type = VOID
 295                 norm = False
 296                 pure = False
 297                 size = 0
 298             channel = Channel(type, norm, pure, size, names[i])
 299             channels.append(channel)
 300
 301         format = Format(name, layout, block_width, block_height, channels, swizzles, colorspace)
 302         formats.append(format)
 303     return formats
 304