src/mesa/main/formats.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (c) 2008-2009  VMware, Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 #include "imports.h"
  28 #include "formats.h"
  29 #include "macros.h"
  30 #include "glformats.h"
  31 #include "c11/threads.h"
  32 #include "util/hash_table.h"
  33
  34 /**
  35  * Information about texture formats.
  36  */
  37 struct gl_format_info
  38 {
  39    mesa_format Name;
  40
  41    /** text name for debugging */
  42    const char *StrName;
  43
  44    enum mesa_format_layout Layout;
  45
  46    /**
  47     * Base format is one of GL_RED, GL_RG, GL_RGB, GL_RGBA, GL_ALPHA,
  48     * GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY, GL_YCBCR_MESA,
  49     * GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
  50     */
  51    GLenum BaseFormat;
  52
  53    /**
  54     * Logical data type: one of  GL_UNSIGNED_NORMALIZED, GL_SIGNED_NORMALIZED,
  55     * GL_UNSIGNED_INT, GL_INT, GL_FLOAT.
  56     */
  57    GLenum DataType;
  58
  59    GLubyte RedBits;
  60    GLubyte GreenBits;
  61    GLubyte BlueBits;
  62    GLubyte AlphaBits;
  63    GLubyte LuminanceBits;
  64    GLubyte IntensityBits;
  65    GLubyte DepthBits;
  66    GLubyte StencilBits;
  67
  68    bool IsSRGBFormat;
  69
  70    /**
  71     * To describe compressed formats.  If not compressed, Width=Height=Depth=1.
  72     */
  73    GLubyte BlockWidth, BlockHeight, BlockDepth;
  74    GLubyte BytesPerBlock;
  75
  76    uint8_t Swizzle[4];
  77    mesa_array_format ArrayFormat;
  78 };
  79
  80 #include "format_info.h"
  81
  82 static const struct gl_format_info *
  83 _mesa_get_format_info(mesa_format format)
  84 {
  85    const struct gl_format_info *info = &format_info[format];
  86    STATIC_ASSERT(ARRAY_SIZE(format_info) == MESA_FORMAT_COUNT);
  87    assert(info->Name == format);
  88    return info;
  89 }
  90
  91
  92 /** Return string name of format (for debugging) */
  93 const char *
  94 _mesa_get_format_name(mesa_format format)
  95 {
  96    const struct gl_format_info *info = _mesa_get_format_info(format);
  97    return info->StrName;
  98 }
  99
 100
 101
 102 /**
 103  * Return bytes needed to store a block of pixels in the given format.
 104  * Normally, a block is 1x1 (a single pixel).  But for compressed formats
 105  * a block may be 4x4 or 8x4, etc.
 106  *
 107  * Note: not GLuint, so as not to coerce math to unsigned. cf. fdo #37351
 108  */
 109 GLint
 110 _mesa_get_format_bytes(mesa_format format)
 111 {
 112    const struct gl_format_info *info = _mesa_get_format_info(format);
 113    assert(info->BytesPerBlock);
 114    assert(info->BytesPerBlock <= MAX_PIXEL_BYTES ||
 115           _mesa_is_format_compressed(format));
 116    return info->BytesPerBlock;
 117 }
 118
 119
 120 /**
 121  * Return bits per component for the given format.
 122  * \param format  one of MESA_FORMAT_x
 123  * \param pname  the component, such as GL_RED_BITS, GL_TEXTURE_BLUE_BITS, etc.
 124  */
 125 GLint
 126 _mesa_get_format_bits(mesa_format format, GLenum pname)
 127 {
 128    const struct gl_format_info *info = _mesa_get_format_info(format);
 129
 130    switch (pname) {
 131    case GL_RED_BITS:
 132    case GL_TEXTURE_RED_SIZE:
 133    case GL_RENDERBUFFER_RED_SIZE_EXT:
 134    case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
 135    case GL_INTERNALFORMAT_RED_SIZE:
 136       return info->RedBits;
 137    case GL_GREEN_BITS:
 138    case GL_TEXTURE_GREEN_SIZE:
 139    case GL_RENDERBUFFER_GREEN_SIZE_EXT:
 140    case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
 141    case GL_INTERNALFORMAT_GREEN_SIZE:
 142       return info->GreenBits;
 143    case GL_BLUE_BITS:
 144    case GL_TEXTURE_BLUE_SIZE:
 145    case GL_RENDERBUFFER_BLUE_SIZE_EXT:
 146    case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
 147    case GL_INTERNALFORMAT_BLUE_SIZE:
 148       return info->BlueBits;
 149    case GL_ALPHA_BITS:
 150    case GL_TEXTURE_ALPHA_SIZE:
 151    case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
 152    case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
 153    case GL_INTERNALFORMAT_ALPHA_SIZE:
 154       return info->AlphaBits;
 155    case GL_TEXTURE_INTENSITY_SIZE:
 156       return info->IntensityBits;
 157    case GL_TEXTURE_LUMINANCE_SIZE:
 158       return info->LuminanceBits;
 159    case GL_INDEX_BITS:
 160       return 0;
 161    case GL_DEPTH_BITS:
 162    case GL_TEXTURE_DEPTH_SIZE_ARB:
 163    case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
 164    case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
 165    case GL_INTERNALFORMAT_DEPTH_SIZE:
 166       return info->DepthBits;
 167    case GL_STENCIL_BITS:
 168    case GL_TEXTURE_STENCIL_SIZE_EXT:
 169    case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
 170    case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
 171    case GL_INTERNALFORMAT_STENCIL_SIZE:
 172       return info->StencilBits;
 173    default:
 174       _mesa_problem(NULL, "bad pname in _mesa_get_format_bits()");
 175       return 0;
 176    }
 177 }
 178
 179
 180 GLuint
 181 _mesa_get_format_max_bits(mesa_format format)
 182 {
 183    const struct gl_format_info *info = _mesa_get_format_info(format);
 184    GLuint max = MAX2(info->RedBits, info->GreenBits);
 185    max = MAX2(max, info->BlueBits);
 186    max = MAX2(max, info->AlphaBits);
 187    max = MAX2(max, info->LuminanceBits);
 188    max = MAX2(max, info->IntensityBits);
 189    max = MAX2(max, info->DepthBits);
 190    max = MAX2(max, info->StencilBits);
 191    return max;
 192 }
 193
 194
 195 /**
 196  * Return the layout type of the given format.
 197  */
 198 extern enum mesa_format_layout
 199 _mesa_get_format_layout(mesa_format format)
 200 {
 201    const struct gl_format_info *info = _mesa_get_format_info(format);
 202    return info->Layout;
 203 }
 204
 205
 206 /**
 207  * Return the data type (or more specifically, the data representation)
 208  * for the given format.
 209  * The return value will be one of:
 210  *    GL_UNSIGNED_NORMALIZED = unsigned int representing [0,1]
 211  *    GL_SIGNED_NORMALIZED = signed int representing [-1, 1]
 212  *    GL_UNSIGNED_INT = an ordinary unsigned integer
 213  *    GL_INT = an ordinary signed integer
 214  *    GL_FLOAT = an ordinary float
 215  */
 216 GLenum
 217 _mesa_get_format_datatype(mesa_format format)
 218 {
 219    const struct gl_format_info *info = _mesa_get_format_info(format);
 220    return info->DataType;
 221 }
 222
 223 static GLenum
 224 get_base_format_for_array_format(mesa_array_format format)
 225 {
 226    uint8_t swizzle[4];
 227    int num_channels;
 228
 229    _mesa_array_format_get_swizzle(format, swizzle);
 230    num_channels = _mesa_array_format_get_num_channels(format);
 231
 232    switch (num_channels) {
 233    case 4:
 234       /* FIXME: RGBX formats have 4 channels, but their base format is GL_RGB.
 235        * This is not really a problem for now because we only create array
 236        * formats from GL format/type combinations, and these cannot specify
 237        * RGBX formats.
 238        */
 239       return GL_RGBA;
 240    case 3:
 241       return GL_RGB;
 242    case 2:
 243       if (swizzle[0] == 0 &&
 244           swizzle[1] == 0 &&
 245           swizzle[2] == 0 &&
 246           swizzle[3] == 1)
 247          return GL_LUMINANCE_ALPHA;
 248       if (swizzle[0] == 1 &&
 249           swizzle[1] == 1 &&
 250           swizzle[2] == 1 &&
 251           swizzle[3] == 0)
 252          return GL_LUMINANCE_ALPHA;
 253       if (swizzle[0] == 0 &&
 254           swizzle[1] == 1 &&
 255           swizzle[2] == 4 &&
 256           swizzle[3] == 5)
 257          return GL_RG;
 258       if (swizzle[0] == 1 &&
 259           swizzle[1] == 0 &&
 260           swizzle[2] == 4 &&
 261           swizzle[3] == 5)
 262          return GL_RG;
 263       break;
 264    case 1:
 265       if (swizzle[0] == 0 &&
 266           swizzle[1] == 0 &&
 267           swizzle[2] == 0 &&
 268           swizzle[3] == 5)
 269          return GL_LUMINANCE;
 270       if (swizzle[0] == 0 &&
 271           swizzle[1] == 0 &&
 272           swizzle[2] == 0 &&
 273           swizzle[3] == 0)
 274          return GL_INTENSITY;
 275       if (swizzle[0] <= MESA_FORMAT_SWIZZLE_W)
 276          return GL_RED;
 277       if (swizzle[1] <= MESA_FORMAT_SWIZZLE_W)
 278          return GL_GREEN;
 279       if (swizzle[2] <= MESA_FORMAT_SWIZZLE_W)
 280          return GL_BLUE;
 281       if (swizzle[3] <= MESA_FORMAT_SWIZZLE_W)
 282          return GL_ALPHA;
 283       break;
 284    }
 285
 286    unreachable("Unsupported format");
 287 }
 288
 289 /**
 290  * Return the basic format for the given type.  The result will be one of
 291  * GL_RGB, GL_RGBA, GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY,
 292  * GL_YCBCR_MESA, GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
 293  * This functions accepts a mesa_format or a mesa_array_format.
 294  */
 295 GLenum
 296 _mesa_get_format_base_format(uint32_t format)
 297 {
 298    if (!_mesa_format_is_mesa_array_format(format)) {
 299       const struct gl_format_info *info = _mesa_get_format_info(format);
 300       return info->BaseFormat;
 301    } else {
 302       return get_base_format_for_array_format(format);
 303    }
 304 }
 305
 306
 307 /**
 308  * Return the block size (in pixels) for the given format.  Normally
 309  * the block size is 1x1.  But compressed formats will have block sizes
 310  * of 4x4 or 8x4 pixels, etc.
 311  * \param bw  returns block width in pixels
 312  * \param bh  returns block height in pixels
 313  */
 314 void
 315 _mesa_get_format_block_size(mesa_format format, GLuint *bw, GLuint *bh)
 316 {
 317    const struct gl_format_info *info = _mesa_get_format_info(format);
 318    /* Use _mesa_get_format_block_size_3d() for 3D blocks. */
 319    assert(info->BlockDepth == 1);
 320
 321    *bw = info->BlockWidth;
 322    *bh = info->BlockHeight;
 323 }
 324
 325
 326 /**
 327  * Return the block size (in pixels) for the given format. Normally
 328  * the block size is 1x1x1. But compressed formats will have block
 329  * sizes of 4x4x4, 3x3x3 pixels, etc.
 330  * \param bw  returns block width in pixels
 331  * \param bh  returns block height in pixels
 332  * \param bd  returns block depth in pixels
 333  */
 334 void
 335 _mesa_get_format_block_size_3d(mesa_format format,
 336                                GLuint *bw,
 337                                GLuint *bh,
 338                                GLuint *bd)
 339 {
 340    const struct gl_format_info *info = _mesa_get_format_info(format);
 341    *bw = info->BlockWidth;
 342    *bh = info->BlockHeight;
 343    *bd = info->BlockDepth;
 344 }
 345
 346
 347 /**
 348  * Returns the an array of four numbers representing the transformation
 349  * from the RGBA or SZ colorspace to the given format.  For array formats,
 350  * the i'th RGBA component is given by:
 351  *
 352  * if (swizzle[i] <= MESA_FORMAT_SWIZZLE_W)
 353  *    comp = data[swizzle[i]];
 354  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ZERO)
 355  *    comp = 0;
 356  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ONE)
 357  *    comp = 1;
 358  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_NONE)
 359  *    // data does not contain a channel of this format
 360  *
 361  * For packed formats, the swizzle gives the number of components left of
 362  * the least significant bit.
 363  *
 364  * Compressed formats have no swizzle.
 365  */
 366 void
 367 _mesa_get_format_swizzle(mesa_format format, uint8_t swizzle_out[4])
 368 {
 369    const struct gl_format_info *info = _mesa_get_format_info(format);
 370    memcpy(swizzle_out, info->Swizzle, sizeof(info->Swizzle));
 371 }
 372
 373 mesa_array_format
 374 _mesa_array_format_flip_channels(mesa_array_format format)
 375 {
 376    int num_channels;
 377    uint8_t swizzle[4];
 378
 379    num_channels = _mesa_array_format_get_num_channels(format);
 380    _mesa_array_format_get_swizzle(format, swizzle);
 381
 382    if (num_channels == 1)
 383       return format;
 384
 385    if (num_channels == 2) {
 386       /* Assert that the swizzle makes sense for 2 channels */
 387       for (unsigned i = 0; i < 4; i++)
 388          assert(swizzle[i] != 2 && swizzle[i] != 3);
 389
 390       static const uint8_t flip_xy[6] = { 1, 0, 2, 3, 4, 5 };
 391       _mesa_array_format_set_swizzle(&format,
 392                                      flip_xy[swizzle[0]], flip_xy[swizzle[1]],
 393                                      flip_xy[swizzle[2]], flip_xy[swizzle[3]]);
 394       return format;
 395    }
 396
 397    if (num_channels == 4) {
 398       static const uint8_t flip[6] = { 3, 2, 1, 0, 4, 5 };
 399       _mesa_array_format_set_swizzle(&format,
 400                                      flip[swizzle[0]], flip[swizzle[1]],
 401                                      flip[swizzle[2]], flip[swizzle[3]]);
 402       return format;
 403    }
 404
 405    unreachable("Invalid array format");
 406 }
 407
 408 uint32_t
 409 _mesa_format_to_array_format(mesa_format format)
 410 {
 411    const struct gl_format_info *info = _mesa_get_format_info(format);
 412    if (info->ArrayFormat && !_mesa_little_endian() &&
 413        info->Layout == MESA_FORMAT_LAYOUT_PACKED)
 414       return _mesa_array_format_flip_channels(info->ArrayFormat);
 415    else
 416       return info->ArrayFormat;
 417 }
 418
 419 static struct hash_table *format_array_format_table;
 420 static once_flag format_array_format_table_exists = ONCE_FLAG_INIT;
 421
 422 static bool
 423 array_formats_equal(const void *a, const void *b)
 424 {
 425    return (intptr_t)a == (intptr_t)b;
 426 }
 427
 428 static void
 429 format_array_format_table_init(void)
 430 {
 431    const struct gl_format_info *info;
 432    mesa_array_format array_format;
 433    unsigned f;
 434
 435    format_array_format_table = _mesa_hash_table_create(NULL, NULL,
 436                                                        array_formats_equal);
 437
 438    if (!format_array_format_table) {
 439       _mesa_error_no_memory(__func__);
 440       return;
 441    }
 442
 443    for (f = 1; f < MESA_FORMAT_COUNT; ++f) {
 444       info = _mesa_get_format_info(f);
 445       if (!info->ArrayFormat)
 446          continue;
 447
 448       if (_mesa_little_endian()) {
 449          array_format = info->ArrayFormat;
 450       } else {
 451          array_format = _mesa_array_format_flip_channels(info->ArrayFormat);
 452       }
 453
 454       /* This can happen and does for some of the BGR formats.  Let's take
 455        * the first one in the list.
 456        */
 457       if (_mesa_hash_table_search_pre_hashed(format_array_format_table,
 458                                              array_format,
 459                                              (void *)(intptr_t)array_format))
 460          continue;
 461
 462       _mesa_hash_table_insert_pre_hashed(format_array_format_table,
 463                                          array_format,
 464                                          (void *)(intptr_t)array_format,
 465                                          (void *)(intptr_t)f);
 466    }
 467 }
 468
 469 mesa_format
 470 _mesa_format_from_array_format(uint32_t array_format)
 471 {
 472    struct hash_entry *entry;
 473
 474    assert(_mesa_format_is_mesa_array_format(array_format));
 475
 476    call_once(&format_array_format_table_exists, format_array_format_table_init);
 477
 478    if (!format_array_format_table) {
 479       static const once_flag once_flag_init = ONCE_FLAG_INIT;
 480       format_array_format_table_exists = once_flag_init;
 481       return MESA_FORMAT_NONE;
 482    }
 483
 484    entry = _mesa_hash_table_search_pre_hashed(format_array_format_table,
 485                                               array_format,
 486                                               (void *)(intptr_t)array_format);
 487    if (entry)
 488       return (intptr_t)entry->data;
 489    else
 490       return MESA_FORMAT_NONE;
 491 }
 492
 493 /** Is the given format a compressed format? */
 494 GLboolean
 495 _mesa_is_format_compressed(mesa_format format)
 496 {
 497    const struct gl_format_info *info = _mesa_get_format_info(format);
 498    return info->BlockWidth > 1 || info->BlockHeight > 1;
 499 }
 500
 501
 502 /**
 503  * Determine if the given format represents a packed depth/stencil buffer.
 504  */
 505 GLboolean
 506 _mesa_is_format_packed_depth_stencil(mesa_format format)
 507 {
 508    const struct gl_format_info *info = _mesa_get_format_info(format);
 509
 510    return info->BaseFormat == GL_DEPTH_STENCIL;
 511 }
 512
 513
 514 /**
 515  * Is the given format a signed/unsigned integer color format?
 516  */
 517 GLboolean
 518 _mesa_is_format_integer_color(mesa_format format)
 519 {
 520    const struct gl_format_info *info = _mesa_get_format_info(format);
 521    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT) &&
 522       info->BaseFormat != GL_DEPTH_COMPONENT &&
 523       info->BaseFormat != GL_DEPTH_STENCIL &&
 524       info->BaseFormat != GL_STENCIL_INDEX;
 525 }
 526
 527
 528 /**
 529  * Is the given format an unsigned integer format?
 530  */
 531 GLboolean
 532 _mesa_is_format_unsigned(mesa_format format)
 533 {
 534    const struct gl_format_info *info = _mesa_get_format_info(format);
 535    return _mesa_is_type_unsigned(info->DataType);
 536 }
 537
 538
 539 /**
 540  * Does the given format store signed values?
 541  */
 542 GLboolean
 543 _mesa_is_format_signed(mesa_format format)
 544 {
 545    if (format == MESA_FORMAT_R11G11B10_FLOAT ||
 546        format == MESA_FORMAT_R9G9B9E5_FLOAT) {
 547       /* these packed float formats only store unsigned values */
 548       return GL_FALSE;
 549    }
 550    else {
 551       const struct gl_format_info *info = _mesa_get_format_info(format);
 552       return (info->DataType == GL_SIGNED_NORMALIZED ||
 553               info->DataType == GL_INT ||
 554               info->DataType == GL_FLOAT);
 555    }
 556 }
 557
 558 /**
 559  * Is the given format an integer format?
 560  */
 561 GLboolean
 562 _mesa_is_format_integer(mesa_format format)
 563 {
 564    const struct gl_format_info *info = _mesa_get_format_info(format);
 565    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT);
 566 }
 567
 568
 569 /**
 570  * Return true if the given format is a color format.
 571  */
 572 GLenum
 573 _mesa_is_format_color_format(mesa_format format)
 574 {
 575    const struct gl_format_info *info = _mesa_get_format_info(format);
 576    switch (info->BaseFormat) {
 577    case GL_DEPTH_COMPONENT:
 578    case GL_STENCIL_INDEX:
 579    case GL_DEPTH_STENCIL:
 580       return false;
 581    default:
 582       return true;
 583    }
 584 }
 585
 586
 587 /**
 588  * Return color encoding for given format.
 589  * \return GL_LINEAR or GL_SRGB
 590  */
 591 GLenum
 592 _mesa_get_format_color_encoding(mesa_format format)
 593 {
 594    const struct gl_format_info *info = _mesa_get_format_info(format);
 595    return info->IsSRGBFormat ? GL_SRGB : GL_LINEAR;
 596 }
 597
 598
 599 /**
 600  * Return TRUE if format is an ETC2 compressed format specified
 601  * by GL_ARB_ES3_compatibility.
 602  */
 603 bool
 604 _mesa_is_format_etc2(mesa_format format)
 605 {
 606    switch (format) {
 607    case MESA_FORMAT_ETC2_RGB8:
 608    case MESA_FORMAT_ETC2_SRGB8:
 609    case MESA_FORMAT_ETC2_RGBA8_EAC:
 610    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 611    case MESA_FORMAT_ETC2_R11_EAC:
 612    case MESA_FORMAT_ETC2_RG11_EAC:
 613    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 614    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 615    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 616    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 617       return GL_TRUE;
 618    default:
 619       return GL_FALSE;
 620    }
 621 }
 622
 623
 624 /**
 625  * If the given format is a compressed format, return a corresponding
 626  * uncompressed format.
 627  */
 628 mesa_format
 629 _mesa_get_uncompressed_format(mesa_format format)
 630 {
 631    switch (format) {
 632    case MESA_FORMAT_RGB_FXT1:
 633       return MESA_FORMAT_BGR_UNORM8;
 634    case MESA_FORMAT_RGBA_FXT1:
 635       return MESA_FORMAT_A8B8G8R8_UNORM;
 636    case MESA_FORMAT_RGB_DXT1:
 637    case MESA_FORMAT_SRGB_DXT1:
 638       return MESA_FORMAT_BGR_UNORM8;
 639    case MESA_FORMAT_RGBA_DXT1:
 640    case MESA_FORMAT_SRGBA_DXT1:
 641       return MESA_FORMAT_A8B8G8R8_UNORM;
 642    case MESA_FORMAT_RGBA_DXT3:
 643    case MESA_FORMAT_SRGBA_DXT3:
 644       return MESA_FORMAT_A8B8G8R8_UNORM;
 645    case MESA_FORMAT_RGBA_DXT5:
 646    case MESA_FORMAT_SRGBA_DXT5:
 647       return MESA_FORMAT_A8B8G8R8_UNORM;
 648    case MESA_FORMAT_R_RGTC1_UNORM:
 649       return MESA_FORMAT_R_UNORM8;
 650    case MESA_FORMAT_R_RGTC1_SNORM:
 651       return MESA_FORMAT_R_SNORM8;
 652    case MESA_FORMAT_RG_RGTC2_UNORM:
 653       return MESA_FORMAT_R8G8_UNORM;
 654    case MESA_FORMAT_RG_RGTC2_SNORM:
 655       return MESA_FORMAT_R8G8_SNORM;
 656    case MESA_FORMAT_L_LATC1_UNORM:
 657       return MESA_FORMAT_L_UNORM8;
 658    case MESA_FORMAT_L_LATC1_SNORM:
 659       return MESA_FORMAT_L_SNORM8;
 660    case MESA_FORMAT_LA_LATC2_UNORM:
 661       return MESA_FORMAT_L8A8_UNORM;
 662    case MESA_FORMAT_LA_LATC2_SNORM:
 663       return MESA_FORMAT_L8A8_SNORM;
 664    case MESA_FORMAT_ETC1_RGB8:
 665    case MESA_FORMAT_ETC2_RGB8:
 666    case MESA_FORMAT_ETC2_SRGB8:
 667       return MESA_FORMAT_BGR_UNORM8;
 668    case MESA_FORMAT_ETC2_RGBA8_EAC:
 669    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 670    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 671    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 672       return MESA_FORMAT_A8B8G8R8_UNORM;
 673    case MESA_FORMAT_ETC2_R11_EAC:
 674    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 675       return MESA_FORMAT_R_UNORM16;
 676    case MESA_FORMAT_ETC2_RG11_EAC:
 677    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 678       return MESA_FORMAT_R16G16_UNORM;
 679    case MESA_FORMAT_BPTC_RGBA_UNORM:
 680    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 681       return MESA_FORMAT_A8B8G8R8_UNORM;
 682    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
 683    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
 684       return MESA_FORMAT_RGB_FLOAT32;
 685    default:
 686 #ifdef DEBUG
 687       assert(!_mesa_is_format_compressed(format));
 688 #endif
 689       return format;
 690    }
 691 }
 692
 693
 694 GLuint
 695 _mesa_format_num_components(mesa_format format)
 696 {
 697    const struct gl_format_info *info = _mesa_get_format_info(format);
 698    return ((info->RedBits > 0) +
 699            (info->GreenBits > 0) +
 700            (info->BlueBits > 0) +
 701            (info->AlphaBits > 0) +
 702            (info->LuminanceBits > 0) +
 703            (info->IntensityBits > 0) +
 704            (info->DepthBits > 0) +
 705            (info->StencilBits > 0));
 706 }
 707
 708
 709 /**
 710  * Returns true if a color format has data stored in the R/G/B/A channels,
 711  * given an index from 0 to 3.
 712  */
 713 bool
 714 _mesa_format_has_color_component(mesa_format format, int component)
 715 {
 716    const struct gl_format_info *info = _mesa_get_format_info(format);
 717
 718    assert(info->BaseFormat != GL_DEPTH_COMPONENT &&
 719           info->BaseFormat != GL_DEPTH_STENCIL &&
 720           info->BaseFormat != GL_STENCIL_INDEX);
 721
 722    switch (component) {
 723    case 0:
 724       return (info->RedBits + info->IntensityBits + info->LuminanceBits) > 0;
 725    case 1:
 726       return (info->GreenBits + info->IntensityBits + info->LuminanceBits) > 0;
 727    case 2:
 728       return (info->BlueBits + info->IntensityBits + info->LuminanceBits) > 0;
 729    case 3:
 730       return (info->AlphaBits + info->IntensityBits) > 0;
 731    default:
 732       assert(!"Invalid color component: must be 0..3");
 733       return false;
 734    }
 735 }
 736
 737
 738 /**
 739  * Return number of bytes needed to store an image of the given size
 740  * in the given format.
 741  */
 742 GLuint
 743 _mesa_format_image_size(mesa_format format, GLsizei width,
 744                         GLsizei height, GLsizei depth)
 745 {
 746    const struct gl_format_info *info = _mesa_get_format_info(format);
 747    GLuint sz;
 748    /* Strictly speaking, a conditional isn't needed here */
 749    if (info->BlockWidth > 1 || info->BlockHeight > 1 || info->BlockDepth > 1) {
 750       /* compressed format (2D only for now) */
 751       const GLuint bw = info->BlockWidth;
 752       const GLuint bh = info->BlockHeight;
 753       const GLuint bd = info->BlockDepth;
 754       const GLuint wblocks = (width + bw - 1) / bw;
 755       const GLuint hblocks = (height + bh - 1) / bh;
 756       const GLuint dblocks = (depth + bd - 1) / bd;
 757       sz = wblocks * hblocks * dblocks * info->BytesPerBlock;
 758    } else
 759       /* non-compressed */
 760       sz = width * height * depth * info->BytesPerBlock;
 761
 762    return sz;
 763 }
 764
 765
 766 /**
 767  * Same as _mesa_format_image_size() but returns a 64-bit value to
 768  * accommodate very large textures.
 769  */
 770 uint64_t
 771 _mesa_format_image_size64(mesa_format format, GLsizei width,
 772                           GLsizei height, GLsizei depth)
 773 {
 774    const struct gl_format_info *info = _mesa_get_format_info(format);
 775    uint64_t sz;
 776    /* Strictly speaking, a conditional isn't needed here */
 777    if (info->BlockWidth > 1 || info->BlockHeight > 1 || info->BlockDepth > 1) {
 778       /* compressed format (2D only for now) */
 779       const uint64_t bw = info->BlockWidth;
 780       const uint64_t bh = info->BlockHeight;
 781       const uint64_t bd = info->BlockDepth;
 782       const uint64_t wblocks = (width + bw - 1) / bw;
 783       const uint64_t hblocks = (height + bh - 1) / bh;
 784       const uint64_t dblocks = (depth + bd - 1) / bd;
 785       sz = wblocks * hblocks * dblocks * info->BytesPerBlock;
 786    } else
 787       /* non-compressed */
 788       sz = ((uint64_t) width * (uint64_t) height *
 789             (uint64_t) depth * info->BytesPerBlock);
 790
 791    return sz;
 792 }
 793
 794
 795
 796 GLint
 797 _mesa_format_row_stride(mesa_format format, GLsizei width)
 798 {
 799    const struct gl_format_info *info = _mesa_get_format_info(format);
 800    /* Strictly speaking, a conditional isn't needed here */
 801    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 802       /* compressed format */
 803       const GLuint bw = info->BlockWidth;
 804       const GLuint wblocks = (width + bw - 1) / bw;
 805       const GLint stride = wblocks * info->BytesPerBlock;
 806       return stride;
 807    }
 808    else {
 809       const GLint stride = width * info->BytesPerBlock;
 810       return stride;
 811    }
 812 }
 813
 814
 815
 816 /**
 817  * Return datatype and number of components per texel for the given
 818  * uncompressed mesa_format. Only used for mipmap generation code.
 819  */
 820 void
 821 _mesa_uncompressed_format_to_type_and_comps(mesa_format format,
 822                                GLenum *datatype, GLuint *comps)
 823 {
 824    switch (format) {
 825    case MESA_FORMAT_A8B8G8R8_UNORM:
 826    case MESA_FORMAT_R8G8B8A8_UNORM:
 827    case MESA_FORMAT_B8G8R8A8_UNORM:
 828    case MESA_FORMAT_A8R8G8B8_UNORM:
 829    case MESA_FORMAT_X8B8G8R8_UNORM:
 830    case MESA_FORMAT_R8G8B8X8_UNORM:
 831    case MESA_FORMAT_B8G8R8X8_UNORM:
 832    case MESA_FORMAT_X8R8G8B8_UNORM:
 833    case MESA_FORMAT_A8B8G8R8_UINT:
 834    case MESA_FORMAT_R8G8B8A8_UINT:
 835    case MESA_FORMAT_B8G8R8A8_UINT:
 836    case MESA_FORMAT_A8R8G8B8_UINT:
 837       *datatype = GL_UNSIGNED_BYTE;
 838       *comps = 4;
 839       return;
 840    case MESA_FORMAT_BGR_UNORM8:
 841    case MESA_FORMAT_RGB_UNORM8:
 842       *datatype = GL_UNSIGNED_BYTE;
 843       *comps = 3;
 844       return;
 845    case MESA_FORMAT_B5G6R5_UNORM:
 846    case MESA_FORMAT_R5G6B5_UNORM:
 847    case MESA_FORMAT_B5G6R5_UINT:
 848    case MESA_FORMAT_R5G6B5_UINT:
 849       *datatype = GL_UNSIGNED_SHORT_5_6_5;
 850       *comps = 3;
 851       return;
 852
 853    case MESA_FORMAT_B4G4R4A4_UNORM:
 854    case MESA_FORMAT_A4R4G4B4_UNORM:
 855    case MESA_FORMAT_B4G4R4X4_UNORM:
 856    case MESA_FORMAT_B4G4R4A4_UINT:
 857    case MESA_FORMAT_A4R4G4B4_UINT:
 858       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 859       *comps = 4;
 860       return;
 861
 862    case MESA_FORMAT_B5G5R5A1_UNORM:
 863    case MESA_FORMAT_A1R5G5B5_UNORM:
 864    case MESA_FORMAT_B5G5R5X1_UNORM:
 865    case MESA_FORMAT_B5G5R5A1_UINT:
 866    case MESA_FORMAT_A1R5G5B5_UINT:
 867       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 868       *comps = 4;
 869       return;
 870
 871    case MESA_FORMAT_B10G10R10A2_UNORM:
 872       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
 873       *comps = 4;
 874       return;
 875
 876    case MESA_FORMAT_A1B5G5R5_UNORM:
 877    case MESA_FORMAT_A1B5G5R5_UINT:
 878    case MESA_FORMAT_X1B5G5R5_UNORM:
 879       *datatype = GL_UNSIGNED_SHORT_5_5_5_1;
 880       *comps = 4;
 881       return;
 882
 883    case MESA_FORMAT_L4A4_UNORM:
 884       *datatype = MESA_UNSIGNED_BYTE_4_4;
 885       *comps = 2;
 886       return;
 887
 888    case MESA_FORMAT_L8A8_UNORM:
 889    case MESA_FORMAT_A8L8_UNORM:
 890    case MESA_FORMAT_R8G8_UNORM:
 891    case MESA_FORMAT_G8R8_UNORM:
 892       *datatype = GL_UNSIGNED_BYTE;
 893       *comps = 2;
 894       return;
 895
 896    case MESA_FORMAT_L16A16_UNORM:
 897    case MESA_FORMAT_A16L16_UNORM:
 898    case MESA_FORMAT_R16G16_UNORM:
 899    case MESA_FORMAT_G16R16_UNORM:
 900       *datatype = GL_UNSIGNED_SHORT;
 901       *comps = 2;
 902       return;
 903
 904    case MESA_FORMAT_R_UNORM16:
 905    case MESA_FORMAT_A_UNORM16:
 906    case MESA_FORMAT_L_UNORM16:
 907    case MESA_FORMAT_I_UNORM16:
 908       *datatype = GL_UNSIGNED_SHORT;
 909       *comps = 1;
 910       return;
 911
 912    case MESA_FORMAT_R3G3B2_UNORM:
 913    case MESA_FORMAT_R3G3B2_UINT:
 914       *datatype = GL_UNSIGNED_BYTE_2_3_3_REV;
 915       *comps = 3;
 916       return;
 917    case MESA_FORMAT_A4B4G4R4_UNORM:
 918    case MESA_FORMAT_A4B4G4R4_UINT:
 919       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 920       *comps = 4;
 921       return;
 922
 923    case MESA_FORMAT_R4G4B4A4_UNORM:
 924    case MESA_FORMAT_R4G4B4A4_UINT:
 925       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 926       *comps = 4;
 927       return;
 928    case MESA_FORMAT_R5G5B5A1_UNORM:
 929    case MESA_FORMAT_R5G5B5A1_UINT:
 930       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 931       *comps = 4;
 932       return;
 933    case MESA_FORMAT_A2B10G10R10_UNORM:
 934    case MESA_FORMAT_A2B10G10R10_UINT:
 935       *datatype = GL_UNSIGNED_INT_10_10_10_2;
 936       *comps = 4;
 937       return;
 938    case MESA_FORMAT_A2R10G10B10_UNORM:
 939    case MESA_FORMAT_A2R10G10B10_UINT:
 940       *datatype = GL_UNSIGNED_INT_10_10_10_2;
 941       *comps = 4;
 942       return;
 943
 944    case MESA_FORMAT_B2G3R3_UNORM:
 945    case MESA_FORMAT_B2G3R3_UINT:
 946       *datatype = GL_UNSIGNED_BYTE_3_3_2;
 947       *comps = 3;
 948       return;
 949
 950    case MESA_FORMAT_A_UNORM8:
 951    case MESA_FORMAT_L_UNORM8:
 952    case MESA_FORMAT_I_UNORM8:
 953    case MESA_FORMAT_R_UNORM8:
 954    case MESA_FORMAT_S_UINT8:
 955       *datatype = GL_UNSIGNED_BYTE;
 956       *comps = 1;
 957       return;
 958
 959    case MESA_FORMAT_YCBCR:
 960    case MESA_FORMAT_YCBCR_REV:
 961       *datatype = GL_UNSIGNED_SHORT;
 962       *comps = 2;
 963       return;
 964
 965    case MESA_FORMAT_S8_UINT_Z24_UNORM:
 966       *datatype = GL_UNSIGNED_INT_24_8_MESA;
 967       *comps = 2;
 968       return;
 969
 970    case MESA_FORMAT_Z24_UNORM_S8_UINT:
 971       *datatype = GL_UNSIGNED_INT_8_24_REV_MESA;
 972       *comps = 2;
 973       return;
 974
 975    case MESA_FORMAT_Z_UNORM16:
 976       *datatype = GL_UNSIGNED_SHORT;
 977       *comps = 1;
 978       return;
 979
 980    case MESA_FORMAT_Z24_UNORM_X8_UINT:
 981       *datatype = GL_UNSIGNED_INT;
 982       *comps = 1;
 983       return;
 984
 985    case MESA_FORMAT_X8_UINT_Z24_UNORM:
 986       *datatype = GL_UNSIGNED_INT;
 987       *comps = 1;
 988       return;
 989
 990    case MESA_FORMAT_Z_UNORM32:
 991       *datatype = GL_UNSIGNED_INT;
 992       *comps = 1;
 993       return;
 994
 995    case MESA_FORMAT_Z_FLOAT32:
 996       *datatype = GL_FLOAT;
 997       *comps = 1;
 998       return;
 999
1000    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
1001       *datatype = GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
1002       *comps = 1;
1003       return;
1004
1005    case MESA_FORMAT_R_SNORM8:
1006    case MESA_FORMAT_A_SNORM8:
1007    case MESA_FORMAT_L_SNORM8:
1008    case MESA_FORMAT_I_SNORM8:
1009       *datatype = GL_BYTE;
1010       *comps = 1;
1011       return;
1012    case MESA_FORMAT_R8G8_SNORM:
1013    case MESA_FORMAT_L8A8_SNORM:
1014    case MESA_FORMAT_A8L8_SNORM:
1015       *datatype = GL_BYTE;
1016       *comps = 2;
1017       return;
1018    case MESA_FORMAT_A8B8G8R8_SNORM:
1019    case MESA_FORMAT_R8G8B8A8_SNORM:
1020    case MESA_FORMAT_X8B8G8R8_SNORM:
1021       *datatype = GL_BYTE;
1022       *comps = 4;
1023       return;
1024
1025    case MESA_FORMAT_RGBA_UNORM16:
1026       *datatype = GL_UNSIGNED_SHORT;
1027       *comps = 4;
1028       return;
1029
1030    case MESA_FORMAT_R_SNORM16:
1031    case MESA_FORMAT_A_SNORM16:
1032    case MESA_FORMAT_L_SNORM16:
1033    case MESA_FORMAT_I_SNORM16:
1034       *datatype = GL_SHORT;
1035       *comps = 1;
1036       return;
1037    case MESA_FORMAT_R16G16_SNORM:
1038    case MESA_FORMAT_LA_SNORM16:
1039       *datatype = GL_SHORT;
1040       *comps = 2;
1041       return;
1042    case MESA_FORMAT_RGB_SNORM16:
1043       *datatype = GL_SHORT;
1044       *comps = 3;
1045       return;
1046    case MESA_FORMAT_RGBA_SNORM16:
1047       *datatype = GL_SHORT;
1048       *comps = 4;
1049       return;
1050
1051    case MESA_FORMAT_BGR_SRGB8:
1052       *datatype = GL_UNSIGNED_BYTE;
1053       *comps = 3;
1054       return;
1055    case MESA_FORMAT_A8B8G8R8_SRGB:
1056    case MESA_FORMAT_B8G8R8A8_SRGB:
1057    case MESA_FORMAT_A8R8G8B8_SRGB:
1058    case MESA_FORMAT_R8G8B8A8_SRGB:
1059       *datatype = GL_UNSIGNED_BYTE;
1060       *comps = 4;
1061       return;
1062    case MESA_FORMAT_L_SRGB8:
1063       *datatype = GL_UNSIGNED_BYTE;
1064       *comps = 1;
1065       return;
1066    case MESA_FORMAT_L8A8_SRGB:
1067    case MESA_FORMAT_A8L8_SRGB:
1068       *datatype = GL_UNSIGNED_BYTE;
1069       *comps = 2;
1070       return;
1071
1072    case MESA_FORMAT_RGBA_FLOAT32:
1073       *datatype = GL_FLOAT;
1074       *comps = 4;
1075       return;
1076    case MESA_FORMAT_RGBA_FLOAT16:
1077       *datatype = GL_HALF_FLOAT_ARB;
1078       *comps = 4;
1079       return;
1080    case MESA_FORMAT_RGB_FLOAT32:
1081       *datatype = GL_FLOAT;
1082       *comps = 3;
1083       return;
1084    case MESA_FORMAT_RGB_FLOAT16:
1085       *datatype = GL_HALF_FLOAT_ARB;
1086       *comps = 3;
1087       return;
1088    case MESA_FORMAT_LA_FLOAT32:
1089    case MESA_FORMAT_RG_FLOAT32:
1090       *datatype = GL_FLOAT;
1091       *comps = 2;
1092       return;
1093    case MESA_FORMAT_LA_FLOAT16:
1094    case MESA_FORMAT_RG_FLOAT16:
1095       *datatype = GL_HALF_FLOAT_ARB;
1096       *comps = 2;
1097       return;
1098    case MESA_FORMAT_A_FLOAT32:
1099    case MESA_FORMAT_L_FLOAT32:
1100    case MESA_FORMAT_I_FLOAT32:
1101    case MESA_FORMAT_R_FLOAT32:
1102       *datatype = GL_FLOAT;
1103       *comps = 1;
1104       return;
1105    case MESA_FORMAT_A_FLOAT16:
1106    case MESA_FORMAT_L_FLOAT16:
1107    case MESA_FORMAT_I_FLOAT16:
1108    case MESA_FORMAT_R_FLOAT16:
1109       *datatype = GL_HALF_FLOAT_ARB;
1110       *comps = 1;
1111       return;
1112
1113    case MESA_FORMAT_A_UINT8:
1114    case MESA_FORMAT_L_UINT8:
1115    case MESA_FORMAT_I_UINT8:
1116       *datatype = GL_UNSIGNED_BYTE;
1117       *comps = 1;
1118       return;
1119    case MESA_FORMAT_LA_UINT8:
1120       *datatype = GL_UNSIGNED_BYTE;
1121       *comps = 2;
1122       return;
1123
1124    case MESA_FORMAT_A_UINT16:
1125    case MESA_FORMAT_L_UINT16:
1126    case MESA_FORMAT_I_UINT16:
1127       *datatype = GL_UNSIGNED_SHORT;
1128       *comps = 1;
1129       return;
1130    case MESA_FORMAT_LA_UINT16:
1131       *datatype = GL_UNSIGNED_SHORT;
1132       *comps = 2;
1133       return;
1134    case MESA_FORMAT_A_UINT32:
1135    case MESA_FORMAT_L_UINT32:
1136    case MESA_FORMAT_I_UINT32:
1137       *datatype = GL_UNSIGNED_INT;
1138       *comps = 1;
1139       return;
1140    case MESA_FORMAT_LA_UINT32:
1141       *datatype = GL_UNSIGNED_INT;
1142       *comps = 2;
1143       return;
1144    case MESA_FORMAT_A_SINT8:
1145    case MESA_FORMAT_L_SINT8:
1146    case MESA_FORMAT_I_SINT8:
1147       *datatype = GL_BYTE;
1148       *comps = 1;
1149       return;
1150    case MESA_FORMAT_LA_SINT8:
1151       *datatype = GL_BYTE;
1152       *comps = 2;
1153       return;
1154
1155    case MESA_FORMAT_A_SINT16:
1156    case MESA_FORMAT_L_SINT16:
1157    case MESA_FORMAT_I_SINT16:
1158       *datatype = GL_SHORT;
1159       *comps = 1;
1160       return;
1161    case MESA_FORMAT_LA_SINT16:
1162       *datatype = GL_SHORT;
1163       *comps = 2;
1164       return;
1165
1166    case MESA_FORMAT_A_SINT32:
1167    case MESA_FORMAT_L_SINT32:
1168    case MESA_FORMAT_I_SINT32:
1169       *datatype = GL_INT;
1170       *comps = 1;
1171       return;
1172    case MESA_FORMAT_LA_SINT32:
1173       *datatype = GL_INT;
1174       *comps = 2;
1175       return;
1176
1177    case MESA_FORMAT_R_SINT8:
1178       *datatype = GL_BYTE;
1179       *comps = 1;
1180       return;
1181    case MESA_FORMAT_RG_SINT8:
1182       *datatype = GL_BYTE;
1183       *comps = 2;
1184       return;
1185    case MESA_FORMAT_RGB_SINT8:
1186       *datatype = GL_BYTE;
1187       *comps = 3;
1188       return;
1189    case MESA_FORMAT_RGBA_SINT8:
1190       *datatype = GL_BYTE;
1191       *comps = 4;
1192       return;
1193    case MESA_FORMAT_R_SINT16:
1194       *datatype = GL_SHORT;
1195       *comps = 1;
1196       return;
1197    case MESA_FORMAT_RG_SINT16:
1198       *datatype = GL_SHORT;
1199       *comps = 2;
1200       return;
1201    case MESA_FORMAT_RGB_SINT16:
1202       *datatype = GL_SHORT;
1203       *comps = 3;
1204       return;
1205    case MESA_FORMAT_RGBA_SINT16:
1206       *datatype = GL_SHORT;
1207       *comps = 4;
1208       return;
1209    case MESA_FORMAT_R_SINT32:
1210       *datatype = GL_INT;
1211       *comps = 1;
1212       return;
1213    case MESA_FORMAT_RG_SINT32:
1214       *datatype = GL_INT;
1215       *comps = 2;
1216       return;
1217    case MESA_FORMAT_RGB_SINT32:
1218       *datatype = GL_INT;
1219       *comps = 3;
1220       return;
1221    case MESA_FORMAT_RGBA_SINT32:
1222       *datatype = GL_INT;
1223       *comps = 4;
1224       return;
1225
1226    /**
1227     * \name Non-normalized unsigned integer formats.
1228     */
1229    case MESA_FORMAT_R_UINT8:
1230       *datatype = GL_UNSIGNED_BYTE;
1231       *comps = 1;
1232       return;
1233    case MESA_FORMAT_RG_UINT8:
1234       *datatype = GL_UNSIGNED_BYTE;
1235       *comps = 2;
1236       return;
1237    case MESA_FORMAT_RGB_UINT8:
1238       *datatype = GL_UNSIGNED_BYTE;
1239       *comps = 3;
1240       return;
1241    case MESA_FORMAT_RGBA_UINT8:
1242       *datatype = GL_UNSIGNED_BYTE;
1243       *comps = 4;
1244       return;
1245    case MESA_FORMAT_R_UINT16:
1246       *datatype = GL_UNSIGNED_SHORT;
1247       *comps = 1;
1248       return;
1249    case MESA_FORMAT_RG_UINT16:
1250       *datatype = GL_UNSIGNED_SHORT;
1251       *comps = 2;
1252       return;
1253    case MESA_FORMAT_RGB_UINT16:
1254       *datatype = GL_UNSIGNED_SHORT;
1255       *comps = 3;
1256       return;
1257    case MESA_FORMAT_RGBA_UINT16:
1258       *datatype = GL_UNSIGNED_SHORT;
1259       *comps = 4;
1260       return;
1261    case MESA_FORMAT_R_UINT32:
1262       *datatype = GL_UNSIGNED_INT;
1263       *comps = 1;
1264       return;
1265    case MESA_FORMAT_RG_UINT32:
1266       *datatype = GL_UNSIGNED_INT;
1267       *comps = 2;
1268       return;
1269    case MESA_FORMAT_RGB_UINT32:
1270       *datatype = GL_UNSIGNED_INT;
1271       *comps = 3;
1272       return;
1273    case MESA_FORMAT_RGBA_UINT32:
1274       *datatype = GL_UNSIGNED_INT;
1275       *comps = 4;
1276       return;
1277
1278    case MESA_FORMAT_R9G9B9E5_FLOAT:
1279       *datatype = GL_UNSIGNED_INT_5_9_9_9_REV;
1280       *comps = 3;
1281       return;
1282
1283    case MESA_FORMAT_R11G11B10_FLOAT:
1284       *datatype = GL_UNSIGNED_INT_10F_11F_11F_REV;
1285       *comps = 3;
1286       return;
1287
1288    case MESA_FORMAT_B10G10R10A2_UINT:
1289    case MESA_FORMAT_R10G10B10A2_UINT:
1290       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1291       *comps = 4;
1292       return;
1293
1294    case MESA_FORMAT_R8G8B8X8_SRGB:
1295    case MESA_FORMAT_X8B8G8R8_SRGB:
1296    case MESA_FORMAT_RGBX_UINT8:
1297       *datatype = GL_UNSIGNED_BYTE;
1298       *comps = 4;
1299       return;
1300
1301    case MESA_FORMAT_R8G8B8X8_SNORM:
1302    case MESA_FORMAT_RGBX_SINT8:
1303       *datatype = GL_BYTE;
1304       *comps = 4;
1305       return;
1306
1307    case MESA_FORMAT_B10G10R10X2_UNORM:
1308    case MESA_FORMAT_R10G10B10X2_UNORM:
1309       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1310       *comps = 4;
1311       return;
1312
1313    case MESA_FORMAT_RGBX_UNORM16:
1314    case MESA_FORMAT_RGBX_UINT16:
1315       *datatype = GL_UNSIGNED_SHORT;
1316       *comps = 4;
1317       return;
1318
1319    case MESA_FORMAT_RGBX_SNORM16:
1320    case MESA_FORMAT_RGBX_SINT16:
1321       *datatype = GL_SHORT;
1322       *comps = 4;
1323       return;
1324
1325    case MESA_FORMAT_RGBX_FLOAT16:
1326       *datatype = GL_HALF_FLOAT;
1327       *comps = 4;
1328       return;
1329
1330    case MESA_FORMAT_RGBX_FLOAT32:
1331       *datatype = GL_FLOAT;
1332       *comps = 4;
1333       return;
1334
1335    case MESA_FORMAT_RGBX_UINT32:
1336       *datatype = GL_UNSIGNED_INT;
1337       *comps = 4;
1338       return;
1339
1340    case MESA_FORMAT_RGBX_SINT32:
1341       *datatype = GL_INT;
1342       *comps = 4;
1343       return;
1344
1345    case MESA_FORMAT_R10G10B10A2_UNORM:
1346       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1347       *comps = 4;
1348       return;
1349
1350    case MESA_FORMAT_G8R8_SNORM:
1351       *datatype = GL_BYTE;
1352       *comps = 2;
1353       return;
1354
1355    case MESA_FORMAT_G16R16_SNORM:
1356       *datatype = GL_SHORT;
1357       *comps = 2;
1358       return;
1359
1360    case MESA_FORMAT_B8G8R8X8_SRGB:
1361    case MESA_FORMAT_X8R8G8B8_SRGB:
1362       *datatype = GL_UNSIGNED_BYTE;
1363       *comps = 4;
1364       return;
1365
1366    case MESA_FORMAT_COUNT:
1367       assert(0);
1368       return;
1369    default:
1370       /* Warn if any formats are not handled */
1371       _mesa_problem(NULL, "bad format %s in _mesa_uncompressed_format_to_type_and_comps",
1372                     _mesa_get_format_name(format));
1373       assert(format == MESA_FORMAT_NONE ||
1374              _mesa_is_format_compressed(format));
1375       *datatype = 0;
1376       *comps = 1;
1377    }
1378 }
1379
1380 /**
1381  * Check if a mesa_format exactly matches a GL format/type combination
1382  * such that we can use memcpy() from one to the other.
1383  * \param mesa_format  a MESA_FORMAT_x value
1384  * \param format  the user-specified image format
1385  * \param type  the user-specified image datatype
1386  * \param swapBytes  typically the current pixel pack/unpack byteswap state
1387  * \param[out] error GL_NO_ERROR if format is an expected input.
1388  *                   GL_INVALID_ENUM if format is an unexpected input.
1389  * \return GL_TRUE if the formats match, GL_FALSE otherwise.
1390  */
1391 GLboolean
1392 _mesa_format_matches_format_and_type(mesa_format mesa_format,
1393                                      GLenum format, GLenum type,
1394                                      GLboolean swapBytes, GLenum *error)
1395 {
1396    const GLboolean littleEndian = _mesa_little_endian();
1397    if (error)
1398       *error = GL_NO_ERROR;
1399
1400    /* Note: When reading a GL format/type combination, the format lists channel
1401     * assignments from most significant channel in the type to least
1402     * significant.  A type with _REV indicates that the assignments are
1403     * swapped, so they are listed from least significant to most significant.
1404     *
1405     * Compressed formats will fall through and return GL_FALSE.
1406     *
1407     * For sanity, please keep this switch statement ordered the same as the
1408     * enums in formats.h.
1409     */
1410
1411    switch (mesa_format) {
1412
1413    case MESA_FORMAT_NONE:
1414    case MESA_FORMAT_COUNT:
1415       return GL_FALSE;
1416
1417    case MESA_FORMAT_A8B8G8R8_UNORM:
1418    case MESA_FORMAT_A8B8G8R8_SRGB:
1419       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1420          return GL_TRUE;
1421
1422       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
1423          return GL_TRUE;
1424
1425       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && !littleEndian)
1426          return GL_TRUE;
1427
1428       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV
1429           && !swapBytes)
1430          return GL_TRUE;
1431
1432       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8
1433           && swapBytes)
1434          return GL_TRUE;
1435
1436       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && littleEndian)
1437          return GL_TRUE;
1438
1439       return GL_FALSE;
1440
1441    case MESA_FORMAT_R8G8B8A8_UNORM:
1442    case MESA_FORMAT_R8G8B8A8_SRGB:
1443       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1444           !swapBytes)
1445          return GL_TRUE;
1446
1447       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1448          return GL_TRUE;
1449
1450       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && littleEndian)
1451          return GL_TRUE;
1452
1453       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8 &&
1454           !swapBytes)
1455          return GL_TRUE;
1456
1457       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1458           swapBytes)
1459          return GL_TRUE;
1460
1461       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && !littleEndian)
1462          return GL_TRUE;
1463
1464       return GL_FALSE;
1465
1466    case MESA_FORMAT_B8G8R8A8_UNORM:
1467    case MESA_FORMAT_B8G8R8A8_SRGB:
1468       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1469           !swapBytes)
1470          return GL_TRUE;
1471
1472       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1473          return GL_TRUE;
1474
1475       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && littleEndian)
1476          return GL_TRUE;
1477
1478       return GL_FALSE;
1479
1480    case MESA_FORMAT_A8R8G8B8_UNORM:
1481    case MESA_FORMAT_A8R8G8B8_SRGB:
1482       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1483          return GL_TRUE;
1484
1485       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1486           swapBytes)
1487          return GL_TRUE;
1488
1489       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && !littleEndian)
1490          return GL_TRUE;
1491
1492       return GL_FALSE;
1493
1494    case MESA_FORMAT_X8B8G8R8_UNORM:
1495    case MESA_FORMAT_R8G8B8X8_UNORM:
1496       return GL_FALSE;
1497
1498    case MESA_FORMAT_B8G8R8X8_UNORM:
1499    case MESA_FORMAT_X8R8G8B8_UNORM:
1500       return GL_FALSE;
1501
1502    case MESA_FORMAT_BGR_UNORM8:
1503    case MESA_FORMAT_BGR_SRGB8:
1504       return format == GL_BGR && type == GL_UNSIGNED_BYTE && littleEndian;
1505
1506    case MESA_FORMAT_RGB_UNORM8:
1507       return format == GL_RGB && type == GL_UNSIGNED_BYTE && littleEndian;
1508
1509    case MESA_FORMAT_B5G6R5_UNORM:
1510       return ((format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) ||
1511               (format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1512               !swapBytes;
1513
1514    case MESA_FORMAT_R5G6B5_UNORM:
1515       return ((format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5) ||
1516               (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1517               !swapBytes;
1518
1519    case MESA_FORMAT_B4G4R4A4_UNORM:
1520       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
1521          !swapBytes;
1522
1523    case MESA_FORMAT_A4R4G4B4_UNORM:
1524       return GL_FALSE;
1525
1526    case MESA_FORMAT_A1B5G5R5_UNORM:
1527       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1528          !swapBytes;
1529
1530    case MESA_FORMAT_X1B5G5R5_UNORM:
1531       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1532          !swapBytes;
1533
1534    case MESA_FORMAT_B5G5R5A1_UNORM:
1535       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
1536          !swapBytes;
1537
1538    case MESA_FORMAT_A1R5G5B5_UNORM:
1539       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1540          !swapBytes;
1541
1542    case MESA_FORMAT_L4A4_UNORM:
1543       return GL_FALSE;
1544    case MESA_FORMAT_L8A8_UNORM:
1545    case MESA_FORMAT_L8A8_SRGB:
1546       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_BYTE && littleEndian;
1547    case MESA_FORMAT_A8L8_UNORM:
1548    case MESA_FORMAT_A8L8_SRGB:
1549       return GL_FALSE;
1550
1551    case MESA_FORMAT_L16A16_UNORM:
1552       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_SHORT && littleEndian && !swapBytes;
1553    case MESA_FORMAT_A16L16_UNORM:
1554       return GL_FALSE;
1555
1556    case MESA_FORMAT_B2G3R3_UNORM:
1557       return format == GL_RGB && type == GL_UNSIGNED_BYTE_3_3_2;
1558
1559    case MESA_FORMAT_R3G3B2_UNORM:
1560       return format == GL_RGB && type == GL_UNSIGNED_BYTE_2_3_3_REV;
1561
1562    case MESA_FORMAT_A4B4G4R4_UNORM:
1563       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1564          return GL_TRUE;
1565
1566       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1567          return GL_TRUE;
1568
1569       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1570          return GL_TRUE;
1571
1572       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1573          return GL_TRUE;
1574
1575       return GL_FALSE;
1576
1577    case MESA_FORMAT_R4G4B4A4_UNORM:
1578       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1579          return GL_TRUE;
1580
1581       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1582          return GL_TRUE;
1583
1584       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1585          return GL_TRUE;
1586
1587       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1588          return GL_TRUE;
1589
1590       return GL_FALSE;
1591
1592    case MESA_FORMAT_R5G5B5A1_UNORM:
1593       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
1594
1595    case MESA_FORMAT_A2B10G10R10_UNORM:
1596       return format == GL_RGBA && type == GL_UNSIGNED_INT_10_10_10_2;
1597
1598    case MESA_FORMAT_A2B10G10R10_UINT:
1599       return format == GL_RGBA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1600
1601    case MESA_FORMAT_A2R10G10B10_UNORM:
1602       return format == GL_BGRA && type == GL_UNSIGNED_INT_10_10_10_2;
1603
1604    case MESA_FORMAT_A2R10G10B10_UINT:
1605       return format == GL_BGRA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1606
1607    case MESA_FORMAT_A_UNORM8:
1608       return format == GL_ALPHA && type == GL_UNSIGNED_BYTE;
1609    case MESA_FORMAT_A_UNORM16:
1610       return format == GL_ALPHA && type == GL_UNSIGNED_SHORT && !swapBytes;
1611    case MESA_FORMAT_L_UNORM8:
1612    case MESA_FORMAT_L_SRGB8:
1613       return format == GL_LUMINANCE && type == GL_UNSIGNED_BYTE;
1614    case MESA_FORMAT_L_UNORM16:
1615       return format == GL_LUMINANCE && type == GL_UNSIGNED_SHORT && !swapBytes;
1616    case MESA_FORMAT_I_UNORM8:
1617       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1618    case MESA_FORMAT_I_UNORM16:
1619       return format == GL_RED && type == GL_UNSIGNED_SHORT && !swapBytes;
1620
1621    case MESA_FORMAT_YCBCR:
1622       return format == GL_YCBCR_MESA &&
1623              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian != swapBytes) ||
1624               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian == swapBytes));
1625    case MESA_FORMAT_YCBCR_REV:
1626       return format == GL_YCBCR_MESA &&
1627              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian == swapBytes) ||
1628               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian != swapBytes));
1629
1630    case MESA_FORMAT_R_UNORM8:
1631       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1632    case MESA_FORMAT_R8G8_UNORM:
1633       return format == GL_RG && type == GL_UNSIGNED_BYTE && littleEndian;
1634    case MESA_FORMAT_G8R8_UNORM:
1635       return GL_FALSE;
1636
1637    case MESA_FORMAT_R_UNORM16:
1638       return format == GL_RED && type == GL_UNSIGNED_SHORT &&
1639          !swapBytes;
1640    case MESA_FORMAT_R16G16_UNORM:
1641       return format == GL_RG && type == GL_UNSIGNED_SHORT && littleEndian &&
1642          !swapBytes;
1643    case MESA_FORMAT_G16R16_UNORM:
1644       return GL_FALSE;
1645
1646    case MESA_FORMAT_B10G10R10A2_UNORM:
1647       return format == GL_BGRA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1648          !swapBytes;
1649
1650    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1651       return format == GL_DEPTH_STENCIL && type == GL_UNSIGNED_INT_24_8 &&
1652          !swapBytes;
1653    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1654    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1655       return GL_FALSE;
1656
1657    case MESA_FORMAT_Z_UNORM16:
1658       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_SHORT &&
1659          !swapBytes;
1660
1661    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1662       return GL_FALSE;
1663
1664    case MESA_FORMAT_Z_UNORM32:
1665       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_INT &&
1666          !swapBytes;
1667
1668    case MESA_FORMAT_S_UINT8:
1669       return format == GL_STENCIL_INDEX && type == GL_UNSIGNED_BYTE;
1670
1671    case MESA_FORMAT_RGBA_FLOAT32:
1672       return format == GL_RGBA && type == GL_FLOAT && !swapBytes;
1673    case MESA_FORMAT_RGBA_FLOAT16:
1674       return format == GL_RGBA && type == GL_HALF_FLOAT && !swapBytes;
1675
1676    case MESA_FORMAT_RGB_FLOAT32:
1677       return format == GL_RGB && type == GL_FLOAT && !swapBytes;
1678    case MESA_FORMAT_RGB_FLOAT16:
1679       return format == GL_RGB && type == GL_HALF_FLOAT && !swapBytes;
1680
1681    case MESA_FORMAT_A_FLOAT32:
1682       return format == GL_ALPHA && type == GL_FLOAT && !swapBytes;
1683    case MESA_FORMAT_A_FLOAT16:
1684       return format == GL_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1685
1686    case MESA_FORMAT_L_FLOAT32:
1687       return format == GL_LUMINANCE && type == GL_FLOAT && !swapBytes;
1688    case MESA_FORMAT_L_FLOAT16:
1689       return format == GL_LUMINANCE && type == GL_HALF_FLOAT && !swapBytes;
1690
1691    case MESA_FORMAT_LA_FLOAT32:
1692       return format == GL_LUMINANCE_ALPHA && type == GL_FLOAT && !swapBytes;
1693    case MESA_FORMAT_LA_FLOAT16:
1694       return format == GL_LUMINANCE_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1695
1696    case MESA_FORMAT_I_FLOAT32:
1697       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1698    case MESA_FORMAT_I_FLOAT16:
1699       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1700
1701    case MESA_FORMAT_R_FLOAT32:
1702       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1703    case MESA_FORMAT_R_FLOAT16:
1704       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1705
1706    case MESA_FORMAT_RG_FLOAT32:
1707       return format == GL_RG && type == GL_FLOAT && !swapBytes;
1708    case MESA_FORMAT_RG_FLOAT16:
1709       return format == GL_RG && type == GL_HALF_FLOAT && !swapBytes;
1710
1711    case MESA_FORMAT_A_UINT8:
1712       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_BYTE;
1713    case MESA_FORMAT_A_UINT16:
1714       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_SHORT &&
1715              !swapBytes;
1716    case MESA_FORMAT_A_UINT32:
1717       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_INT &&
1718              !swapBytes;
1719    case MESA_FORMAT_A_SINT8:
1720       return format == GL_ALPHA_INTEGER && type == GL_BYTE;
1721    case MESA_FORMAT_A_SINT16:
1722       return format == GL_ALPHA_INTEGER && type == GL_SHORT && !swapBytes;
1723    case MESA_FORMAT_A_SINT32:
1724       return format == GL_ALPHA_INTEGER && type == GL_INT && !swapBytes;
1725
1726    case MESA_FORMAT_I_UINT8:
1727       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1728    case MESA_FORMAT_I_UINT16:
1729       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1730    case MESA_FORMAT_I_UINT32:
1731       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1732    case MESA_FORMAT_I_SINT8:
1733       return format == GL_RED_INTEGER && type == GL_BYTE;
1734    case MESA_FORMAT_I_SINT16:
1735       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1736    case MESA_FORMAT_I_SINT32:
1737       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1738
1739    case MESA_FORMAT_L_UINT8:
1740       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_BYTE;
1741    case MESA_FORMAT_L_UINT16:
1742       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_SHORT &&
1743              !swapBytes;
1744    case MESA_FORMAT_L_UINT32:
1745       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_INT &&
1746              !swapBytes;
1747    case MESA_FORMAT_L_SINT8:
1748       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_BYTE;
1749    case MESA_FORMAT_L_SINT16:
1750       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_SHORT &&
1751              !swapBytes;
1752    case MESA_FORMAT_L_SINT32:
1753       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_INT && !swapBytes;
1754
1755    case MESA_FORMAT_LA_UINT8:
1756       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1757              type == GL_UNSIGNED_BYTE && !swapBytes;
1758    case MESA_FORMAT_LA_UINT16:
1759       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1760              type == GL_UNSIGNED_SHORT && !swapBytes;
1761    case MESA_FORMAT_LA_UINT32:
1762       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1763              type == GL_UNSIGNED_INT && !swapBytes;
1764    case MESA_FORMAT_LA_SINT8:
1765       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_BYTE &&
1766              !swapBytes;
1767    case MESA_FORMAT_LA_SINT16:
1768       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_SHORT &&
1769              !swapBytes;
1770    case MESA_FORMAT_LA_SINT32:
1771       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_INT &&
1772              !swapBytes;
1773
1774    case MESA_FORMAT_R_SINT8:
1775       return format == GL_RED_INTEGER && type == GL_BYTE;
1776    case MESA_FORMAT_RG_SINT8:
1777       return format == GL_RG_INTEGER && type == GL_BYTE && !swapBytes;
1778    case MESA_FORMAT_RGB_SINT8:
1779       return format == GL_RGB_INTEGER && type == GL_BYTE && !swapBytes;
1780    case MESA_FORMAT_RGBA_SINT8:
1781       return format == GL_RGBA_INTEGER && type == GL_BYTE && !swapBytes;
1782    case MESA_FORMAT_R_SINT16:
1783       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1784    case MESA_FORMAT_RG_SINT16:
1785       return format == GL_RG_INTEGER && type == GL_SHORT && !swapBytes;
1786    case MESA_FORMAT_RGB_SINT16:
1787       return format == GL_RGB_INTEGER && type == GL_SHORT && !swapBytes;
1788    case MESA_FORMAT_RGBA_SINT16:
1789       return format == GL_RGBA_INTEGER && type == GL_SHORT && !swapBytes;
1790    case MESA_FORMAT_R_SINT32:
1791       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1792    case MESA_FORMAT_RG_SINT32:
1793       return format == GL_RG_INTEGER && type == GL_INT && !swapBytes;
1794    case MESA_FORMAT_RGB_SINT32:
1795       return format == GL_RGB_INTEGER && type == GL_INT && !swapBytes;
1796    case MESA_FORMAT_RGBA_SINT32:
1797       return format == GL_RGBA_INTEGER && type == GL_INT && !swapBytes;
1798
1799    case MESA_FORMAT_R_UINT8:
1800       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1801    case MESA_FORMAT_RG_UINT8:
1802       return format == GL_RG_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1803    case MESA_FORMAT_RGB_UINT8:
1804       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1805    case MESA_FORMAT_RGBA_UINT8:
1806       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_BYTE &&
1807              !swapBytes;
1808    case MESA_FORMAT_R_UINT16:
1809       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT &&
1810              !swapBytes;
1811    case MESA_FORMAT_RG_UINT16:
1812       return format == GL_RG_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1813    case MESA_FORMAT_RGB_UINT16:
1814       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT &&
1815              !swapBytes;
1816    case MESA_FORMAT_RGBA_UINT16:
1817       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT &&
1818              !swapBytes;
1819    case MESA_FORMAT_R_UINT32:
1820       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1821    case MESA_FORMAT_RG_UINT32:
1822       return format == GL_RG_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1823    case MESA_FORMAT_RGB_UINT32:
1824       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1825    case MESA_FORMAT_RGBA_UINT32:
1826       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1827
1828    case MESA_FORMAT_R_SNORM8:
1829       return format == GL_RED && type == GL_BYTE;
1830    case MESA_FORMAT_R8G8_SNORM:
1831       return format == GL_RG && type == GL_BYTE && littleEndian &&
1832              !swapBytes;
1833    case MESA_FORMAT_X8B8G8R8_SNORM:
1834       return GL_FALSE;
1835
1836    case MESA_FORMAT_A8B8G8R8_SNORM:
1837       if (format == GL_RGBA && type == GL_BYTE && !littleEndian)
1838          return GL_TRUE;
1839
1840       if (format == GL_ABGR_EXT && type == GL_BYTE && littleEndian)
1841          return GL_TRUE;
1842
1843       return GL_FALSE;
1844
1845    case MESA_FORMAT_R8G8B8A8_SNORM:
1846       if (format == GL_RGBA && type == GL_BYTE && littleEndian)
1847          return GL_TRUE;
1848
1849       if (format == GL_ABGR_EXT && type == GL_BYTE && !littleEndian)
1850          return GL_TRUE;
1851
1852       return GL_FALSE;
1853
1854    case MESA_FORMAT_R_SNORM16:
1855       return format == GL_RED && type == GL_SHORT &&
1856              !swapBytes;
1857    case MESA_FORMAT_R16G16_SNORM:
1858       return format == GL_RG && type == GL_SHORT && littleEndian && !swapBytes;
1859    case MESA_FORMAT_RGB_SNORM16:
1860       return format == GL_RGB && type == GL_SHORT && !swapBytes;
1861    case MESA_FORMAT_RGBA_SNORM16:
1862       return format == GL_RGBA && type == GL_SHORT && !swapBytes;
1863    case MESA_FORMAT_RGBA_UNORM16:
1864       return format == GL_RGBA && type == GL_UNSIGNED_SHORT &&
1865              !swapBytes;
1866
1867    case MESA_FORMAT_A_SNORM8:
1868       return format == GL_ALPHA && type == GL_BYTE;
1869    case MESA_FORMAT_L_SNORM8:
1870       return format == GL_LUMINANCE && type == GL_BYTE;
1871    case MESA_FORMAT_L8A8_SNORM:
1872       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
1873              littleEndian && !swapBytes;
1874    case MESA_FORMAT_A8L8_SNORM:
1875       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
1876              !littleEndian && !swapBytes;
1877    case MESA_FORMAT_I_SNORM8:
1878       return format == GL_RED && type == GL_BYTE;
1879    case MESA_FORMAT_A_SNORM16:
1880       return format == GL_ALPHA && type == GL_SHORT && !swapBytes;
1881    case MESA_FORMAT_L_SNORM16:
1882       return format == GL_LUMINANCE && type == GL_SHORT && !swapBytes;
1883    case MESA_FORMAT_LA_SNORM16:
1884       return format == GL_LUMINANCE_ALPHA && type == GL_SHORT &&
1885              littleEndian && !swapBytes;
1886    case MESA_FORMAT_I_SNORM16:
1887       return format == GL_RED && type == GL_SHORT && littleEndian &&
1888              !swapBytes;
1889
1890    case MESA_FORMAT_B10G10R10A2_UINT:
1891       return (format == GL_BGRA_INTEGER_EXT &&
1892               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1893               !swapBytes);
1894
1895    case MESA_FORMAT_R10G10B10A2_UINT:
1896       return (format == GL_RGBA_INTEGER_EXT &&
1897               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1898               !swapBytes);
1899
1900    case MESA_FORMAT_B5G6R5_UINT:
1901       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT_5_6_5;
1902
1903    case MESA_FORMAT_R5G6B5_UINT:
1904       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT_5_6_5_REV;
1905
1906    case MESA_FORMAT_B2G3R3_UINT:
1907       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE_3_3_2;
1908
1909    case MESA_FORMAT_R3G3B2_UINT:
1910       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE_2_3_3_REV;
1911
1912    case MESA_FORMAT_A4B4G4R4_UINT:
1913       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1914          return GL_TRUE;
1915
1916       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1917          return GL_TRUE;
1918       return GL_FALSE;
1919
1920    case MESA_FORMAT_R4G4B4A4_UINT:
1921       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1922          return GL_TRUE;
1923
1924       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1925          return GL_TRUE;
1926
1927       return GL_FALSE;
1928
1929    case MESA_FORMAT_B4G4R4A4_UINT:
1930       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
1931          !swapBytes;
1932
1933    case MESA_FORMAT_A4R4G4B4_UINT:
1934       return GL_FALSE;
1935
1936    case MESA_FORMAT_A1B5G5R5_UINT:
1937       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1938          !swapBytes;
1939
1940    case MESA_FORMAT_B5G5R5A1_UINT:
1941       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
1942          !swapBytes;
1943
1944    case MESA_FORMAT_A1R5G5B5_UINT:
1945       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1946          !swapBytes;
1947
1948    case MESA_FORMAT_R5G5B5A1_UINT:
1949       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
1950
1951    case MESA_FORMAT_A8B8G8R8_UINT:
1952       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1953          return GL_TRUE;
1954
1955       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
1956          return GL_TRUE;
1957       return GL_FALSE;
1958
1959    case MESA_FORMAT_A8R8G8B8_UINT:
1960       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 &&
1961           !swapBytes)
1962          return GL_TRUE;
1963
1964       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1965           swapBytes)
1966          return GL_TRUE;
1967
1968       return GL_FALSE;
1969
1970    case MESA_FORMAT_R8G8B8A8_UINT:
1971       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1972           !swapBytes)
1973          return GL_TRUE;
1974
1975       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1976          return GL_TRUE;
1977
1978       return GL_FALSE;
1979
1980    case MESA_FORMAT_B8G8R8A8_UINT:
1981       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1982           !swapBytes)
1983          return GL_TRUE;
1984
1985       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1986          return GL_TRUE;
1987
1988       return GL_FALSE;
1989
1990    case MESA_FORMAT_R9G9B9E5_FLOAT:
1991       return format == GL_RGB && type == GL_UNSIGNED_INT_5_9_9_9_REV &&
1992          !swapBytes;
1993
1994    case MESA_FORMAT_R11G11B10_FLOAT:
1995       return format == GL_RGB && type == GL_UNSIGNED_INT_10F_11F_11F_REV &&
1996          !swapBytes;
1997
1998    case MESA_FORMAT_Z_FLOAT32:
1999       return format == GL_DEPTH_COMPONENT && type == GL_FLOAT && !swapBytes;
2000
2001    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
2002       return format == GL_DEPTH_STENCIL &&
2003              type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV && !swapBytes;
2004
2005    case MESA_FORMAT_B4G4R4X4_UNORM:
2006    case MESA_FORMAT_B5G5R5X1_UNORM:
2007    case MESA_FORMAT_R8G8B8X8_SNORM:
2008    case MESA_FORMAT_R8G8B8X8_SRGB:
2009    case MESA_FORMAT_X8B8G8R8_SRGB:
2010    case MESA_FORMAT_RGBX_UINT8:
2011    case MESA_FORMAT_RGBX_SINT8:
2012    case MESA_FORMAT_B10G10R10X2_UNORM:
2013    case MESA_FORMAT_RGBX_UNORM16:
2014    case MESA_FORMAT_RGBX_SNORM16:
2015    case MESA_FORMAT_RGBX_FLOAT16:
2016    case MESA_FORMAT_RGBX_UINT16:
2017    case MESA_FORMAT_RGBX_SINT16:
2018    case MESA_FORMAT_RGBX_FLOAT32:
2019    case MESA_FORMAT_RGBX_UINT32:
2020    case MESA_FORMAT_RGBX_SINT32:
2021       return GL_FALSE;
2022
2023    case MESA_FORMAT_R10G10B10X2_UNORM:
2024       return format == GL_RGB && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2025          !swapBytes;
2026    case MESA_FORMAT_R10G10B10A2_UNORM:
2027       return format == GL_RGBA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2028          !swapBytes;
2029
2030    case MESA_FORMAT_G8R8_SNORM:
2031       return format == GL_RG && type == GL_BYTE && !littleEndian &&
2032          !swapBytes;
2033
2034    case MESA_FORMAT_G16R16_SNORM:
2035       return format == GL_RG && type == GL_SHORT && !littleEndian &&
2036          !swapBytes;
2037
2038    case MESA_FORMAT_B8G8R8X8_SRGB:
2039    case MESA_FORMAT_X8R8G8B8_SRGB:
2040       return GL_FALSE;
2041    default:
2042       assert(_mesa_is_format_compressed(mesa_format));
2043       if (error)
2044          *error = GL_INVALID_ENUM;
2045    }
2046    return GL_FALSE;
2047 }
2048