src/gallium/auxiliary/util/u_format_pack.py

   1 #!/usr/bin/env python
   2
   3 '''
   4 /**************************************************************************
   5  *
   6  * Copyright 2009-2010 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  * @file
  33  * Pixel format packing and unpacking functions.
  34  *
  35  * @author Jose Fonseca <jfonseca@vmware.com>
  36  */
  37 '''
  38
  39
  40 from u_format_parse import *
  41
  42
  43 def inv_swizzles(swizzles):
  44     '''Return an array[4] of inverse swizzle terms'''
  45     '''Only pick the first matching value to avoid l8 getting blue and i8 getting alpha'''
  46     inv_swizzle = [None]*4
  47     for i in range(4):
  48         swizzle = swizzles[i]
  49         if swizzle < 4 and inv_swizzle[swizzle] == None:
  50             inv_swizzle[swizzle] = i
  51     return inv_swizzle
  52
  53 def print_channels(format, func):
  54     if format.nr_channels() <= 1:
  55         func(format.le_channels, format.le_swizzles)
  56     else:
  57         print '#ifdef PIPE_ARCH_BIG_ENDIAN'
  58         func(format.be_channels, format.be_swizzles)
  59         print '#else'
  60         func(format.le_channels, format.le_swizzles)
  61         print '#endif'
  62
  63 def generate_format_type(format):
  64     '''Generate a structure that describes the format.'''
  65
  66     assert format.layout == PLAIN
  67
  68     def generate_bitfields(channels, swizzles):
  69         for channel in channels:
  70             if channel.type == VOID:
  71                 if channel.size:
  72                     print '      unsigned %s:%u;' % (channel.name, channel.size)
  73             elif channel.type == UNSIGNED:
  74                 print '      unsigned %s:%u;' % (channel.name, channel.size)
  75             elif channel.type in (SIGNED, FIXED):
  76                 print '      int %s:%u;' % (channel.name, channel.size)
  77             elif channel.type == FLOAT:
  78                 if channel.size == 64:
  79                     print '      double %s;' % (channel.name)
  80                 elif channel.size == 32:
  81                     print '      float %s;' % (channel.name)
  82                 else:
  83                     print '      unsigned %s:%u;' % (channel.name, channel.size)
  84             else:
  85                 assert 0
  86
  87     def generate_full_fields(channels, swizzles):
  88         for channel in channels:
  89             assert channel.size % 8 == 0 and is_pot(channel.size)
  90             if channel.type == VOID:
  91                 if channel.size:
  92                     print '      uint%u_t %s;' % (channel.size, channel.name)
  93             elif channel.type == UNSIGNED:
  94                 print '      uint%u_t %s;' % (channel.size, channel.name)
  95             elif channel.type in (SIGNED, FIXED):
  96                 print '      int%u_t %s;' % (channel.size, channel.name)
  97             elif channel.type == FLOAT:
  98                 if channel.size == 64:
  99                     print '      double %s;' % (channel.name)
 100                 elif channel.size == 32:
 101                     print '      float %s;' % (channel.name)
 102                 elif channel.size == 16:
 103                     print '      uint16_t %s;' % (channel.name)
 104                 else:
 105                     assert 0
 106             else:
 107                 assert 0
 108
 109     print 'union util_format_%s {' % format.short_name()
 110
 111     if format.block_size() in (8, 16, 32, 64):
 112         print '   uint%u_t value;' % (format.block_size(),)
 113
 114     use_bitfields = False
 115     for channel in format.le_channels:
 116         if channel.size % 8 or not is_pot(channel.size):
 117             use_bitfields = True
 118
 119     print '   struct {'
 120     if use_bitfields:
 121         print_channels(format, generate_bitfields)
 122     else:
 123         print_channels(format, generate_full_fields)
 124     print '   } chan;'
 125     print '};'
 126     print
 127
 128
 129 def is_format_supported(format):
 130     '''Determines whether we actually have the plumbing necessary to generate the
 131     to read/write to/from this format.'''
 132
 133     # FIXME: Ideally we would support any format combination here.
 134
 135     if format.layout != PLAIN:
 136         return False
 137
 138     for i in range(4):
 139         channel = format.le_channels[i]
 140         if channel.type not in (VOID, UNSIGNED, SIGNED, FLOAT, FIXED):
 141             return False
 142         if channel.type == FLOAT and channel.size not in (16, 32, 64):
 143             return False
 144
 145     return True
 146
 147 def native_type(format):
 148     '''Get the native appropriate for a format.'''
 149
 150     if format.name == 'PIPE_FORMAT_R11G11B10_FLOAT':
 151         return 'uint32_t'
 152     if format.name == 'PIPE_FORMAT_R9G9B9E5_FLOAT':
 153         return 'uint32_t'
 154
 155     if format.layout == PLAIN:
 156         if not format.is_array():
 157             # For arithmetic pixel formats return the integer type that matches the whole pixel
 158             return 'uint%u_t' % format.block_size()
 159         else:
 160             # For array pixel formats return the integer type that matches the color channel
 161             channel = format.array_element()
 162             if channel.type in (UNSIGNED, VOID):
 163                 return 'uint%u_t' % channel.size
 164             elif channel.type in (SIGNED, FIXED):
 165                 return 'int%u_t' % channel.size
 166             elif channel.type == FLOAT:
 167                 if channel.size == 16:
 168                     return 'uint16_t'
 169                 elif channel.size == 32:
 170                     return 'float'
 171                 elif channel.size == 64:
 172                     return 'double'
 173                 else:
 174                     assert False
 175             else:
 176                 assert False
 177     else:
 178         assert False
 179
 180
 181 def intermediate_native_type(bits, sign):
 182     '''Find a native type adequate to hold intermediate results of the request bit size.'''
 183
 184     bytes = 4 # don't use anything smaller than 32bits
 185     while bytes * 8 < bits:
 186         bytes *= 2
 187     bits = bytes*8
 188
 189     if sign:
 190         return 'int%u_t' % bits
 191     else:
 192         return 'uint%u_t' % bits
 193
 194
 195 def get_one_shift(type):
 196     '''Get the number of the bit that matches unity for this type.'''
 197     if type.type == 'FLOAT':
 198         assert False
 199     if not type.norm:
 200         return 0
 201     if type.type == UNSIGNED:
 202         return type.size
 203     if type.type == SIGNED:
 204         return type.size - 1
 205     if type.type == FIXED:
 206         return type.size / 2
 207     assert False
 208
 209
 210 def value_to_native(type, value):
 211     '''Get the value of unity for this type.'''
 212     if type.type == FLOAT:
 213         return value
 214     if type.type == FIXED:
 215         return int(value * (1 << (type.size/2)))
 216     if not type.norm:
 217         return int(value)
 218     if type.type == UNSIGNED:
 219         return int(value * ((1 << type.size) - 1))
 220     if type.type == SIGNED:
 221         return int(value * ((1 << (type.size - 1)) - 1))
 222     assert False
 223
 224
 225 def native_to_constant(type, value):
 226     '''Get the value of unity for this type.'''
 227     if type.type == FLOAT:
 228         if type.size <= 32:
 229             return "%.1ff" % float(value)
 230         else:
 231             return "%.1f" % float(value)
 232     else:
 233         return str(int(value))
 234
 235
 236 def get_one(type):
 237     '''Get the value of unity for this type.'''
 238     return value_to_native(type, 1)
 239
 240
 241 def clamp_expr(src_channel, dst_channel, dst_native_type, value):
 242     '''Generate the expression to clamp the value in the source type to the
 243     destination type range.'''
 244
 245     if src_channel == dst_channel:
 246         return value
 247
 248     src_min = src_channel.min()
 249     src_max = src_channel.max()
 250     dst_min = dst_channel.min()
 251     dst_max = dst_channel.max()
 252
 253     # Translate the destination range to the src native value
 254     dst_min_native = native_to_constant(src_channel, value_to_native(src_channel, dst_min))
 255     dst_max_native = native_to_constant(src_channel, value_to_native(src_channel, dst_max))
 256
 257     if src_min < dst_min and src_max > dst_max:
 258         return 'CLAMP(%s, %s, %s)' % (value, dst_min_native, dst_max_native)
 259
 260     if src_max > dst_max:
 261         return 'MIN2(%s, %s)' % (value, dst_max_native)
 262
 263     if src_min < dst_min:
 264         return 'MAX2(%s, %s)' % (value, dst_min_native)
 265
 266     return value
 267
 268
 269 def conversion_expr(src_channel,
 270                     dst_channel, dst_native_type,
 271                     value,
 272                     clamp=True,
 273                     src_colorspace = RGB,
 274                     dst_colorspace = RGB):
 275     '''Generate the expression to convert a value between two types.'''
 276
 277     if src_colorspace != dst_colorspace:
 278         if src_colorspace == SRGB:
 279             assert src_channel.type == UNSIGNED
 280             assert src_channel.norm
 281             assert src_channel.size <= 8
 282             assert src_channel.size >= 4
 283             assert dst_colorspace == RGB
 284             if src_channel.size < 8:
 285                 value = '%s << %x | %s >> %x' % (value, 8 - src_channel.size, value, 2 * src_channel.size - 8)
 286             if dst_channel.type == FLOAT:
 287                 return 'util_format_srgb_8unorm_to_linear_float(%s)' % value
 288             else:
 289                 assert dst_channel.type == UNSIGNED
 290                 assert dst_channel.norm
 291                 assert dst_channel.size == 8
 292                 return 'util_format_srgb_to_linear_8unorm(%s)' % value
 293         elif dst_colorspace == SRGB:
 294             assert dst_channel.type == UNSIGNED
 295             assert dst_channel.norm
 296             assert dst_channel.size <= 8
 297             assert src_colorspace == RGB
 298             if src_channel.type == FLOAT:
 299                 value =  'util_format_linear_float_to_srgb_8unorm(%s)' % value
 300             else:
 301                 assert src_channel.type == UNSIGNED
 302                 assert src_channel.norm
 303                 assert src_channel.size == 8
 304                 value = 'util_format_linear_to_srgb_8unorm(%s)' % value
 305             # XXX rounding is all wrong.
 306             if dst_channel.size < 8:
 307                 return '%s >> %x' % (value, 8 - dst_channel.size)
 308             else:
 309                 return value
 310         elif src_colorspace == ZS:
 311             pass
 312         elif dst_colorspace == ZS:
 313             pass
 314         else:
 315             assert 0
 316
 317     if src_channel == dst_channel:
 318         return value
 319
 320     src_type = src_channel.type
 321     src_size = src_channel.size
 322     src_norm = src_channel.norm
 323     src_pure = src_channel.pure
 324
 325     # Promote half to float
 326     if src_type == FLOAT and src_size == 16:
 327         value = 'util_half_to_float(%s)' % value
 328         src_size = 32
 329
 330     # Special case for float <-> ubytes for more accurate results
 331     # Done before clamping since these functions already take care of that
 332     if src_type == UNSIGNED and src_norm and src_size == 8 and dst_channel.type == FLOAT and dst_channel.size == 32:
 333         return 'ubyte_to_float(%s)' % value
 334     if src_type == FLOAT and src_size == 32 and dst_channel.type == UNSIGNED and dst_channel.norm and dst_channel.size == 8:
 335         return 'float_to_ubyte(%s)' % value
 336
 337     if clamp:
 338         if dst_channel.type != FLOAT or src_type != FLOAT:
 339             value = clamp_expr(src_channel, dst_channel, dst_native_type, value)
 340
 341     if src_type in (SIGNED, UNSIGNED) and dst_channel.type in (SIGNED, UNSIGNED):
 342         if not src_norm and not dst_channel.norm:
 343             # neither is normalized -- just cast
 344             return '(%s)%s' % (dst_native_type, value)
 345
 346         src_one = get_one(src_channel)
 347         dst_one = get_one(dst_channel)
 348
 349         if src_one > dst_one and src_norm and dst_channel.norm:
 350             # We can just bitshift
 351             src_shift = get_one_shift(src_channel)
 352             dst_shift = get_one_shift(dst_channel)
 353             value = '(%s >> %s)' % (value, src_shift - dst_shift)
 354         else:
 355             # We need to rescale using an intermediate type big enough to hold the multiplication of both
 356             tmp_native_type = intermediate_native_type(src_size + dst_channel.size, src_channel.sign and dst_channel.sign)
 357             value = '((%s)%s)' % (tmp_native_type, value)
 358             value = '(%s * 0x%x / 0x%x)' % (value, dst_one, src_one)
 359         value = '(%s)%s' % (dst_native_type, value)
 360         return value
 361
 362     # Promote to either float or double
 363     if src_type != FLOAT:
 364         if src_norm or src_type == FIXED:
 365             one = get_one(src_channel)
 366             if src_size <= 23:
 367                 value = '(%s * (1.0f/0x%x))' % (value, one)
 368                 if dst_channel.size <= 32:
 369                     value = '(float)%s' % value
 370                 src_size = 32
 371             else:
 372                 # bigger than single precision mantissa, use double
 373                 value = '(%s * (1.0/0x%x))' % (value, one)
 374                 src_size = 64
 375             src_norm = False
 376         else:
 377             if src_size <= 23 or dst_channel.size <= 32:
 378                 value = '(float)%s' % value
 379                 src_size = 32
 380             else:
 381                 # bigger than single precision mantissa, use double
 382                 value = '(double)%s' % value
 383                 src_size = 64
 384         src_type = FLOAT
 385
 386     # Convert double or float to non-float
 387     if dst_channel.type != FLOAT:
 388         if dst_channel.norm or dst_channel.type == FIXED:
 389             dst_one = get_one(dst_channel)
 390             if dst_channel.size <= 23:
 391                 value = 'util_iround(%s * 0x%x)' % (value, dst_one)
 392             else:
 393                 # bigger than single precision mantissa, use double
 394                 value = '(%s * (double)0x%x)' % (value, dst_one)
 395         value = '(%s)%s' % (dst_native_type, value)
 396     else:
 397         # Cast double to float when converting to either half or float
 398         if dst_channel.size <= 32 and src_size > 32:
 399             value = '(float)%s' % value
 400             src_size = 32
 401
 402         if dst_channel.size == 16:
 403             value = 'util_float_to_half(%s)' % value
 404         elif dst_channel.size == 64 and src_size < 64:
 405             value = '(double)%s' % value
 406
 407     return value
 408
 409
 410 def generate_unpack_kernel(format, dst_channel, dst_native_type):
 411
 412     if not is_format_supported(format):
 413         return
 414
 415     assert format.layout == PLAIN
 416
 417     src_native_type = native_type(format)
 418
 419     def unpack_from_bitmask(channels, swizzles):
 420         depth = format.block_size()
 421         print '         uint%u_t value = *(const uint%u_t *)src;' % (depth, depth)
 422
 423         # Declare the intermediate variables
 424         for i in range(format.nr_channels()):
 425             src_channel = channels[i]
 426             if src_channel.type == UNSIGNED:
 427                 print '         uint%u_t %s;' % (depth, src_channel.name)
 428             elif src_channel.type == SIGNED:
 429                 print '         int%u_t %s;' % (depth, src_channel.name)
 430
 431         # Compute the intermediate unshifted values
 432         for i in range(format.nr_channels()):
 433             src_channel = channels[i]
 434             value = 'value'
 435             shift = src_channel.shift
 436             if src_channel.type == UNSIGNED:
 437                 if shift:
 438                     value = '%s >> %u' % (value, shift)
 439                 if shift + src_channel.size < depth:
 440                     value = '(%s) & 0x%x' % (value, (1 << src_channel.size) - 1)
 441             elif src_channel.type == SIGNED:
 442                 if shift + src_channel.size < depth:
 443                     # Align the sign bit
 444                     lshift = depth - (shift + src_channel.size)
 445                     value = '%s << %u' % (value, lshift)
 446                 # Cast to signed
 447                 value = '(int%u_t)(%s) ' % (depth, value)
 448                 if src_channel.size < depth:
 449                     # Align the LSB bit
 450                     rshift = depth - src_channel.size
 451                     value = '(%s) >> %u' % (value, rshift)
 452             else:
 453                 value = None
 454
 455             if value is not None:
 456                 print '         %s = %s;' % (src_channel.name, value)
 457
 458         # Convert, swizzle, and store final values
 459         for i in range(4):
 460             swizzle = swizzles[i]
 461             if swizzle < 4:
 462                 src_channel = channels[swizzle]
 463                 src_colorspace = format.colorspace
 464                 if src_colorspace == SRGB and i == 3:
 465                     # Alpha channel is linear
 466                     src_colorspace = RGB
 467                 value = src_channel.name
 468                 value = conversion_expr(src_channel,
 469                                         dst_channel, dst_native_type,
 470                                         value,
 471                                         src_colorspace = src_colorspace)
 472             elif swizzle == SWIZZLE_0:
 473                 value = '0'
 474             elif swizzle == SWIZZLE_1:
 475                 value = get_one(dst_channel)
 476             elif swizzle == SWIZZLE_NONE:
 477                 value = '0'
 478             else:
 479                 assert False
 480             print '         dst[%u] = %s; /* %s */' % (i, value, 'rgba'[i])
 481
 482     def unpack_from_union(channels, swizzles):
 483         print '         union util_format_%s pixel;' % format.short_name()
 484         print '         memcpy(&pixel, src, sizeof pixel);'
 485
 486         for i in range(4):
 487             swizzle = swizzles[i]
 488             if swizzle < 4:
 489                 src_channel = channels[swizzle]
 490                 src_colorspace = format.colorspace
 491                 if src_colorspace == SRGB and i == 3:
 492                     # Alpha channel is linear
 493                     src_colorspace = RGB
 494                 value = 'pixel.chan.%s' % src_channel.name
 495                 value = conversion_expr(src_channel,
 496                                         dst_channel, dst_native_type,
 497                                         value,
 498                                         src_colorspace = src_colorspace)
 499             elif swizzle == SWIZZLE_0:
 500                 value = '0'
 501             elif swizzle == SWIZZLE_1:
 502                 value = get_one(dst_channel)
 503             elif swizzle == SWIZZLE_NONE:
 504                 value = '0'
 505             else:
 506                 assert False
 507             print '         dst[%u] = %s; /* %s */' % (i, value, 'rgba'[i])
 508
 509     if format.is_bitmask():
 510         print_channels(format, unpack_from_bitmask)
 511     else:
 512         print_channels(format, unpack_from_union)
 513
 514
 515 def generate_pack_kernel(format, src_channel, src_native_type):
 516
 517     if not is_format_supported(format):
 518         return
 519
 520     dst_native_type = native_type(format)
 521
 522     assert format.layout == PLAIN
 523
 524     def pack_into_bitmask(channels, swizzles):
 525         inv_swizzle = inv_swizzles(swizzles)
 526
 527         depth = format.block_size()
 528         print '         uint%u_t value = 0;' % depth
 529
 530         for i in range(4):
 531             dst_channel = channels[i]
 532             shift = dst_channel.shift
 533             if inv_swizzle[i] is not None:
 534                 value ='src[%u]' % inv_swizzle[i]
 535                 dst_colorspace = format.colorspace
 536                 if dst_colorspace == SRGB and inv_swizzle[i] == 3:
 537                     # Alpha channel is linear
 538                     dst_colorspace = RGB
 539                 value = conversion_expr(src_channel,
 540                                         dst_channel, dst_native_type,
 541                                         value,
 542                                         dst_colorspace = dst_colorspace)
 543                 if dst_channel.type in (UNSIGNED, SIGNED):
 544                     if shift + dst_channel.size < depth:
 545                         value = '(%s) & 0x%x' % (value, (1 << dst_channel.size) - 1)
 546                     if shift:
 547                         value = '(%s) << %u' % (value, shift)
 548                     if dst_channel.type == SIGNED:
 549                         # Cast to unsigned
 550                         value = '(uint%u_t)(%s) ' % (depth, value)
 551                 else:
 552                     value = None
 553                 if value is not None:
 554                     print '         value |= %s;' % (value)
 555
 556         print '         *(uint%u_t *)dst = value;' % depth
 557
 558     def pack_into_union(channels, swizzles):
 559         inv_swizzle = inv_swizzles(swizzles)
 560
 561         print '         union util_format_%s pixel;' % format.short_name()
 562
 563         for i in range(4):
 564             dst_channel = channels[i]
 565             width = dst_channel.size
 566             if inv_swizzle[i] is None:
 567                 continue
 568             dst_colorspace = format.colorspace
 569             if dst_colorspace == SRGB and inv_swizzle[i] == 3:
 570                 # Alpha channel is linear
 571                 dst_colorspace = RGB
 572             value ='src[%u]' % inv_swizzle[i]
 573             value = conversion_expr(src_channel,
 574                                     dst_channel, dst_native_type,
 575                                     value,
 576                                     dst_colorspace = dst_colorspace)
 577             print '         pixel.chan.%s = %s;' % (dst_channel.name, value)
 578
 579         print '         memcpy(dst, &pixel, sizeof pixel);'
 580
 581     if format.is_bitmask():
 582         print_channels(format, pack_into_bitmask)
 583     else:
 584         print_channels(format, pack_into_union)
 585
 586
 587 def generate_format_unpack(format, dst_channel, dst_native_type, dst_suffix):
 588     '''Generate the function to unpack pixels from a particular format'''
 589
 590     name = format.short_name()
 591
 592     print 'static INLINE void'
 593     print 'util_format_%s_unpack_%s(%s *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)' % (name, dst_suffix, dst_native_type)
 594     print '{'
 595
 596     if is_format_supported(format):
 597         print '   unsigned x, y;'
 598         print '   for(y = 0; y < height; y += %u) {' % (format.block_height,)
 599         print '      %s *dst = dst_row;' % (dst_native_type)
 600         print '      const uint8_t *src = src_row;'
 601         print '      for(x = 0; x < width; x += %u) {' % (format.block_width,)
 602
 603         generate_unpack_kernel(format, dst_channel, dst_native_type)
 604
 605         print '         src += %u;' % (format.block_size() / 8,)
 606         print '         dst += 4;'
 607         print '      }'
 608         print '      src_row += src_stride;'
 609         print '      dst_row += dst_stride/sizeof(*dst_row);'
 610         print '   }'
 611
 612     print '}'
 613     print
 614
 615
 616 def generate_format_pack(format, src_channel, src_native_type, src_suffix):
 617     '''Generate the function to pack pixels to a particular format'''
 618
 619     name = format.short_name()
 620
 621     print 'static INLINE void'
 622     print 'util_format_%s_pack_%s(uint8_t *dst_row, unsigned dst_stride, const %s *src_row, unsigned src_stride, unsigned width, unsigned height)' % (name, src_suffix, src_native_type)
 623     print '{'
 624
 625     if is_format_supported(format):
 626         print '   unsigned x, y;'
 627         print '   for(y = 0; y < height; y += %u) {' % (format.block_height,)
 628         print '      const %s *src = src_row;' % (src_native_type)
 629         print '      uint8_t *dst = dst_row;'
 630         print '      for(x = 0; x < width; x += %u) {' % (format.block_width,)
 631
 632         generate_pack_kernel(format, src_channel, src_native_type)
 633
 634         print '         src += 4;'
 635         print '         dst += %u;' % (format.block_size() / 8,)
 636         print '      }'
 637         print '      dst_row += dst_stride;'
 638         print '      src_row += src_stride/sizeof(*src_row);'
 639         print '   }'
 640
 641     print '}'
 642     print
 643
 644
 645 def generate_format_fetch(format, dst_channel, dst_native_type, dst_suffix):
 646     '''Generate the function to unpack pixels from a particular format'''
 647
 648     name = format.short_name()
 649
 650     print 'static INLINE void'
 651     print 'util_format_%s_fetch_%s(%s *dst, const uint8_t *src, unsigned i, unsigned j)' % (name, dst_suffix, dst_native_type)
 652     print '{'
 653
 654     if is_format_supported(format):
 655         generate_unpack_kernel(format, dst_channel, dst_native_type)
 656
 657     print '}'
 658     print
 659
 660
 661 def is_format_hand_written(format):
 662     return format.layout in ('s3tc', 'rgtc', 'etc', 'bptc', 'subsampled', 'other') or format.colorspace == ZS
 663
 664
 665 def generate(formats):
 666     print
 667     print '#include "pipe/p_compiler.h"'
 668     print '#include "u_math.h"'
 669     print '#include "u_half.h"'
 670     print '#include "u_format.h"'
 671     print '#include "u_format_other.h"'
 672     print '#include "util/format_srgb.h"'
 673     print '#include "u_format_yuv.h"'
 674     print '#include "u_format_zs.h"'
 675     print
 676
 677     for format in formats:
 678         if not is_format_hand_written(format):
 679
 680             if is_format_supported(format):
 681                 generate_format_type(format)
 682
 683             if format.is_pure_unsigned():
 684                 native_type = 'unsigned'
 685                 suffix = 'unsigned'
 686                 channel = Channel(UNSIGNED, False, True, 32)
 687
 688                 generate_format_unpack(format, channel, native_type, suffix)
 689                 generate_format_pack(format, channel, native_type, suffix)
 690                 generate_format_fetch(format, channel, native_type, suffix)
 691
 692                 channel = Channel(SIGNED, False, True, 32)
 693                 native_type = 'int'
 694                 suffix = 'signed'
 695                 generate_format_unpack(format, channel, native_type, suffix)
 696                 generate_format_pack(format, channel, native_type, suffix)
 697             elif format.is_pure_signed():
 698                 native_type = 'int'
 699                 suffix = 'signed'
 700                 channel = Channel(SIGNED, False, True, 32)
 701
 702                 generate_format_unpack(format, channel, native_type, suffix)
 703                 generate_format_pack(format, channel, native_type, suffix)
 704                 generate_format_fetch(format, channel, native_type, suffix)
 705
 706                 native_type = 'unsigned'
 707                 suffix = 'unsigned'
 708                 channel = Channel(UNSIGNED, False, True, 32)
 709                 generate_format_unpack(format, channel, native_type, suffix)
 710                 generate_format_pack(format, channel, native_type, suffix)
 711             else:
 712                 channel = Channel(FLOAT, False, False, 32)
 713                 native_type = 'float'
 714                 suffix = 'rgba_float'
 715
 716                 generate_format_unpack(format, channel, native_type, suffix)
 717                 generate_format_pack(format, channel, native_type, suffix)
 718                 generate_format_fetch(format, channel, native_type, suffix)
 719
 720                 channel = Channel(UNSIGNED, True, False, 8)
 721                 native_type = 'uint8_t'
 722                 suffix = 'rgba_8unorm'
 723
 724                 generate_format_unpack(format, channel, native_type, suffix)
 725                 generate_format_pack(format, channel, native_type, suffix)
 726