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       *datatype = GL_UNSIGNED_SHORT_5_5_5_1;
 879       *comps = 4;
 880       return;
 881
 882    case MESA_FORMAT_L4A4_UNORM:
 883       *datatype = MESA_UNSIGNED_BYTE_4_4;
 884       *comps = 2;
 885       return;
 886
 887    case MESA_FORMAT_L8A8_UNORM:
 888    case MESA_FORMAT_A8L8_UNORM:
 889    case MESA_FORMAT_R8G8_UNORM:
 890    case MESA_FORMAT_G8R8_UNORM:
 891       *datatype = GL_UNSIGNED_BYTE;
 892       *comps = 2;
 893       return;
 894
 895    case MESA_FORMAT_L16A16_UNORM:
 896    case MESA_FORMAT_A16L16_UNORM:
 897    case MESA_FORMAT_R16G16_UNORM:
 898    case MESA_FORMAT_G16R16_UNORM:
 899       *datatype = GL_UNSIGNED_SHORT;
 900       *comps = 2;
 901       return;
 902
 903    case MESA_FORMAT_R_UNORM16:
 904    case MESA_FORMAT_A_UNORM16:
 905    case MESA_FORMAT_L_UNORM16:
 906    case MESA_FORMAT_I_UNORM16:
 907       *datatype = GL_UNSIGNED_SHORT;
 908       *comps = 1;
 909       return;
 910
 911    case MESA_FORMAT_R3G3B2_UNORM:
 912    case MESA_FORMAT_R3G3B2_UINT:
 913       *datatype = GL_UNSIGNED_BYTE_2_3_3_REV;
 914       *comps = 3;
 915       return;
 916    case MESA_FORMAT_A4B4G4R4_UNORM:
 917    case MESA_FORMAT_A4B4G4R4_UINT:
 918       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 919       *comps = 4;
 920       return;
 921
 922    case MESA_FORMAT_R4G4B4A4_UNORM:
 923    case MESA_FORMAT_R4G4B4A4_UINT:
 924       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 925       *comps = 4;
 926       return;
 927    case MESA_FORMAT_R5G5B5A1_UNORM:
 928    case MESA_FORMAT_R5G5B5A1_UINT:
 929       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 930       *comps = 4;
 931       return;
 932    case MESA_FORMAT_A2B10G10R10_UNORM:
 933    case MESA_FORMAT_A2B10G10R10_UINT:
 934       *datatype = GL_UNSIGNED_INT_10_10_10_2;
 935       *comps = 4;
 936       return;
 937    case MESA_FORMAT_A2R10G10B10_UNORM:
 938    case MESA_FORMAT_A2R10G10B10_UINT:
 939       *datatype = GL_UNSIGNED_INT_10_10_10_2;
 940       *comps = 4;
 941       return;
 942
 943    case MESA_FORMAT_B2G3R3_UNORM:
 944    case MESA_FORMAT_B2G3R3_UINT:
 945       *datatype = GL_UNSIGNED_BYTE_3_3_2;
 946       *comps = 3;
 947       return;
 948
 949    case MESA_FORMAT_A_UNORM8:
 950    case MESA_FORMAT_L_UNORM8:
 951    case MESA_FORMAT_I_UNORM8:
 952    case MESA_FORMAT_R_UNORM8:
 953    case MESA_FORMAT_S_UINT8:
 954       *datatype = GL_UNSIGNED_BYTE;
 955       *comps = 1;
 956       return;
 957
 958    case MESA_FORMAT_YCBCR:
 959    case MESA_FORMAT_YCBCR_REV:
 960       *datatype = GL_UNSIGNED_SHORT;
 961       *comps = 2;
 962       return;
 963
 964    case MESA_FORMAT_S8_UINT_Z24_UNORM:
 965       *datatype = GL_UNSIGNED_INT_24_8_MESA;
 966       *comps = 2;
 967       return;
 968
 969    case MESA_FORMAT_Z24_UNORM_S8_UINT:
 970       *datatype = GL_UNSIGNED_INT_8_24_REV_MESA;
 971       *comps = 2;
 972       return;
 973
 974    case MESA_FORMAT_Z_UNORM16:
 975       *datatype = GL_UNSIGNED_SHORT;
 976       *comps = 1;
 977       return;
 978
 979    case MESA_FORMAT_Z24_UNORM_X8_UINT:
 980       *datatype = GL_UNSIGNED_INT;
 981       *comps = 1;
 982       return;
 983
 984    case MESA_FORMAT_X8_UINT_Z24_UNORM:
 985       *datatype = GL_UNSIGNED_INT;
 986       *comps = 1;
 987       return;
 988
 989    case MESA_FORMAT_Z_UNORM32:
 990       *datatype = GL_UNSIGNED_INT;
 991       *comps = 1;
 992       return;
 993
 994    case MESA_FORMAT_Z_FLOAT32:
 995       *datatype = GL_FLOAT;
 996       *comps = 1;
 997       return;
 998
 999    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
1000       *datatype = GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
1001       *comps = 1;
1002       return;
1003
1004    case MESA_FORMAT_R_SNORM8:
1005    case MESA_FORMAT_A_SNORM8:
1006    case MESA_FORMAT_L_SNORM8:
1007    case MESA_FORMAT_I_SNORM8:
1008       *datatype = GL_BYTE;
1009       *comps = 1;
1010       return;
1011    case MESA_FORMAT_R8G8_SNORM:
1012    case MESA_FORMAT_L8A8_SNORM:
1013    case MESA_FORMAT_A8L8_SNORM:
1014       *datatype = GL_BYTE;
1015       *comps = 2;
1016       return;
1017    case MESA_FORMAT_A8B8G8R8_SNORM:
1018    case MESA_FORMAT_R8G8B8A8_SNORM:
1019    case MESA_FORMAT_X8B8G8R8_SNORM:
1020       *datatype = GL_BYTE;
1021       *comps = 4;
1022       return;
1023
1024    case MESA_FORMAT_RGBA_UNORM16:
1025       *datatype = GL_UNSIGNED_SHORT;
1026       *comps = 4;
1027       return;
1028
1029    case MESA_FORMAT_R_SNORM16:
1030    case MESA_FORMAT_A_SNORM16:
1031    case MESA_FORMAT_L_SNORM16:
1032    case MESA_FORMAT_I_SNORM16:
1033       *datatype = GL_SHORT;
1034       *comps = 1;
1035       return;
1036    case MESA_FORMAT_R16G16_SNORM:
1037    case MESA_FORMAT_LA_SNORM16:
1038       *datatype = GL_SHORT;
1039       *comps = 2;
1040       return;
1041    case MESA_FORMAT_RGB_SNORM16:
1042       *datatype = GL_SHORT;
1043       *comps = 3;
1044       return;
1045    case MESA_FORMAT_RGBA_SNORM16:
1046       *datatype = GL_SHORT;
1047       *comps = 4;
1048       return;
1049
1050    case MESA_FORMAT_BGR_SRGB8:
1051       *datatype = GL_UNSIGNED_BYTE;
1052       *comps = 3;
1053       return;
1054    case MESA_FORMAT_A8B8G8R8_SRGB:
1055    case MESA_FORMAT_B8G8R8A8_SRGB:
1056    case MESA_FORMAT_A8R8G8B8_SRGB:
1057    case MESA_FORMAT_R8G8B8A8_SRGB:
1058       *datatype = GL_UNSIGNED_BYTE;
1059       *comps = 4;
1060       return;
1061    case MESA_FORMAT_L_SRGB8:
1062       *datatype = GL_UNSIGNED_BYTE;
1063       *comps = 1;
1064       return;
1065    case MESA_FORMAT_L8A8_SRGB:
1066    case MESA_FORMAT_A8L8_SRGB:
1067       *datatype = GL_UNSIGNED_BYTE;
1068       *comps = 2;
1069       return;
1070
1071    case MESA_FORMAT_RGBA_FLOAT32:
1072       *datatype = GL_FLOAT;
1073       *comps = 4;
1074       return;
1075    case MESA_FORMAT_RGBA_FLOAT16:
1076       *datatype = GL_HALF_FLOAT_ARB;
1077       *comps = 4;
1078       return;
1079    case MESA_FORMAT_RGB_FLOAT32:
1080       *datatype = GL_FLOAT;
1081       *comps = 3;
1082       return;
1083    case MESA_FORMAT_RGB_FLOAT16:
1084       *datatype = GL_HALF_FLOAT_ARB;
1085       *comps = 3;
1086       return;
1087    case MESA_FORMAT_LA_FLOAT32:
1088    case MESA_FORMAT_RG_FLOAT32:
1089       *datatype = GL_FLOAT;
1090       *comps = 2;
1091       return;
1092    case MESA_FORMAT_LA_FLOAT16:
1093    case MESA_FORMAT_RG_FLOAT16:
1094       *datatype = GL_HALF_FLOAT_ARB;
1095       *comps = 2;
1096       return;
1097    case MESA_FORMAT_A_FLOAT32:
1098    case MESA_FORMAT_L_FLOAT32:
1099    case MESA_FORMAT_I_FLOAT32:
1100    case MESA_FORMAT_R_FLOAT32:
1101       *datatype = GL_FLOAT;
1102       *comps = 1;
1103       return;
1104    case MESA_FORMAT_A_FLOAT16:
1105    case MESA_FORMAT_L_FLOAT16:
1106    case MESA_FORMAT_I_FLOAT16:
1107    case MESA_FORMAT_R_FLOAT16:
1108       *datatype = GL_HALF_FLOAT_ARB;
1109       *comps = 1;
1110       return;
1111
1112    case MESA_FORMAT_A_UINT8:
1113    case MESA_FORMAT_L_UINT8:
1114    case MESA_FORMAT_I_UINT8:
1115       *datatype = GL_UNSIGNED_BYTE;
1116       *comps = 1;
1117       return;
1118    case MESA_FORMAT_LA_UINT8:
1119       *datatype = GL_UNSIGNED_BYTE;
1120       *comps = 2;
1121       return;
1122
1123    case MESA_FORMAT_A_UINT16:
1124    case MESA_FORMAT_L_UINT16:
1125    case MESA_FORMAT_I_UINT16:
1126       *datatype = GL_UNSIGNED_SHORT;
1127       *comps = 1;
1128       return;
1129    case MESA_FORMAT_LA_UINT16:
1130       *datatype = GL_UNSIGNED_SHORT;
1131       *comps = 2;
1132       return;
1133    case MESA_FORMAT_A_UINT32:
1134    case MESA_FORMAT_L_UINT32:
1135    case MESA_FORMAT_I_UINT32:
1136       *datatype = GL_UNSIGNED_INT;
1137       *comps = 1;
1138       return;
1139    case MESA_FORMAT_LA_UINT32:
1140       *datatype = GL_UNSIGNED_INT;
1141       *comps = 2;
1142       return;
1143    case MESA_FORMAT_A_SINT8:
1144    case MESA_FORMAT_L_SINT8:
1145    case MESA_FORMAT_I_SINT8:
1146       *datatype = GL_BYTE;
1147       *comps = 1;
1148       return;
1149    case MESA_FORMAT_LA_SINT8:
1150       *datatype = GL_BYTE;
1151       *comps = 2;
1152       return;
1153
1154    case MESA_FORMAT_A_SINT16:
1155    case MESA_FORMAT_L_SINT16:
1156    case MESA_FORMAT_I_SINT16:
1157       *datatype = GL_SHORT;
1158       *comps = 1;
1159       return;
1160    case MESA_FORMAT_LA_SINT16:
1161       *datatype = GL_SHORT;
1162       *comps = 2;
1163       return;
1164
1165    case MESA_FORMAT_A_SINT32:
1166    case MESA_FORMAT_L_SINT32:
1167    case MESA_FORMAT_I_SINT32:
1168       *datatype = GL_INT;
1169       *comps = 1;
1170       return;
1171    case MESA_FORMAT_LA_SINT32:
1172       *datatype = GL_INT;
1173       *comps = 2;
1174       return;
1175
1176    case MESA_FORMAT_R_SINT8:
1177       *datatype = GL_BYTE;
1178       *comps = 1;
1179       return;
1180    case MESA_FORMAT_RG_SINT8:
1181       *datatype = GL_BYTE;
1182       *comps = 2;
1183       return;
1184    case MESA_FORMAT_RGB_SINT8:
1185       *datatype = GL_BYTE;
1186       *comps = 3;
1187       return;
1188    case MESA_FORMAT_RGBA_SINT8:
1189       *datatype = GL_BYTE;
1190       *comps = 4;
1191       return;
1192    case MESA_FORMAT_R_SINT16:
1193       *datatype = GL_SHORT;
1194       *comps = 1;
1195       return;
1196    case MESA_FORMAT_RG_SINT16:
1197       *datatype = GL_SHORT;
1198       *comps = 2;
1199       return;
1200    case MESA_FORMAT_RGB_SINT16:
1201       *datatype = GL_SHORT;
1202       *comps = 3;
1203       return;
1204    case MESA_FORMAT_RGBA_SINT16:
1205       *datatype = GL_SHORT;
1206       *comps = 4;
1207       return;
1208    case MESA_FORMAT_R_SINT32:
1209       *datatype = GL_INT;
1210       *comps = 1;
1211       return;
1212    case MESA_FORMAT_RG_SINT32:
1213       *datatype = GL_INT;
1214       *comps = 2;
1215       return;
1216    case MESA_FORMAT_RGB_SINT32:
1217       *datatype = GL_INT;
1218       *comps = 3;
1219       return;
1220    case MESA_FORMAT_RGBA_SINT32:
1221       *datatype = GL_INT;
1222       *comps = 4;
1223       return;
1224
1225    /**
1226     * \name Non-normalized unsigned integer formats.
1227     */
1228    case MESA_FORMAT_R_UINT8:
1229       *datatype = GL_UNSIGNED_BYTE;
1230       *comps = 1;
1231       return;
1232    case MESA_FORMAT_RG_UINT8:
1233       *datatype = GL_UNSIGNED_BYTE;
1234       *comps = 2;
1235       return;
1236    case MESA_FORMAT_RGB_UINT8:
1237       *datatype = GL_UNSIGNED_BYTE;
1238       *comps = 3;
1239       return;
1240    case MESA_FORMAT_RGBA_UINT8:
1241       *datatype = GL_UNSIGNED_BYTE;
1242       *comps = 4;
1243       return;
1244    case MESA_FORMAT_R_UINT16:
1245       *datatype = GL_UNSIGNED_SHORT;
1246       *comps = 1;
1247       return;
1248    case MESA_FORMAT_RG_UINT16:
1249       *datatype = GL_UNSIGNED_SHORT;
1250       *comps = 2;
1251       return;
1252    case MESA_FORMAT_RGB_UINT16:
1253       *datatype = GL_UNSIGNED_SHORT;
1254       *comps = 3;
1255       return;
1256    case MESA_FORMAT_RGBA_UINT16:
1257       *datatype = GL_UNSIGNED_SHORT;
1258       *comps = 4;
1259       return;
1260    case MESA_FORMAT_R_UINT32:
1261       *datatype = GL_UNSIGNED_INT;
1262       *comps = 1;
1263       return;
1264    case MESA_FORMAT_RG_UINT32:
1265       *datatype = GL_UNSIGNED_INT;
1266       *comps = 2;
1267       return;
1268    case MESA_FORMAT_RGB_UINT32:
1269       *datatype = GL_UNSIGNED_INT;
1270       *comps = 3;
1271       return;
1272    case MESA_FORMAT_RGBA_UINT32:
1273       *datatype = GL_UNSIGNED_INT;
1274       *comps = 4;
1275       return;
1276
1277    case MESA_FORMAT_R9G9B9E5_FLOAT:
1278       *datatype = GL_UNSIGNED_INT_5_9_9_9_REV;
1279       *comps = 3;
1280       return;
1281
1282    case MESA_FORMAT_R11G11B10_FLOAT:
1283       *datatype = GL_UNSIGNED_INT_10F_11F_11F_REV;
1284       *comps = 3;
1285       return;
1286
1287    case MESA_FORMAT_B10G10R10A2_UINT:
1288    case MESA_FORMAT_R10G10B10A2_UINT:
1289       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1290       *comps = 4;
1291       return;
1292
1293    case MESA_FORMAT_R8G8B8X8_SRGB:
1294    case MESA_FORMAT_X8B8G8R8_SRGB:
1295    case MESA_FORMAT_RGBX_UINT8:
1296       *datatype = GL_UNSIGNED_BYTE;
1297       *comps = 4;
1298       return;
1299
1300    case MESA_FORMAT_R8G8B8X8_SNORM:
1301    case MESA_FORMAT_RGBX_SINT8:
1302       *datatype = GL_BYTE;
1303       *comps = 4;
1304       return;
1305
1306    case MESA_FORMAT_B10G10R10X2_UNORM:
1307    case MESA_FORMAT_R10G10B10X2_UNORM:
1308       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1309       *comps = 4;
1310       return;
1311
1312    case MESA_FORMAT_RGBX_UNORM16:
1313    case MESA_FORMAT_RGBX_UINT16:
1314       *datatype = GL_UNSIGNED_SHORT;
1315       *comps = 4;
1316       return;
1317
1318    case MESA_FORMAT_RGBX_SNORM16:
1319    case MESA_FORMAT_RGBX_SINT16:
1320       *datatype = GL_SHORT;
1321       *comps = 4;
1322       return;
1323
1324    case MESA_FORMAT_RGBX_FLOAT16:
1325       *datatype = GL_HALF_FLOAT;
1326       *comps = 4;
1327       return;
1328
1329    case MESA_FORMAT_RGBX_FLOAT32:
1330       *datatype = GL_FLOAT;
1331       *comps = 4;
1332       return;
1333
1334    case MESA_FORMAT_RGBX_UINT32:
1335       *datatype = GL_UNSIGNED_INT;
1336       *comps = 4;
1337       return;
1338
1339    case MESA_FORMAT_RGBX_SINT32:
1340       *datatype = GL_INT;
1341       *comps = 4;
1342       return;
1343
1344    case MESA_FORMAT_R10G10B10A2_UNORM:
1345       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1346       *comps = 4;
1347       return;
1348
1349    case MESA_FORMAT_G8R8_SNORM:
1350       *datatype = GL_BYTE;
1351       *comps = 2;
1352       return;
1353
1354    case MESA_FORMAT_G16R16_SNORM:
1355       *datatype = GL_SHORT;
1356       *comps = 2;
1357       return;
1358
1359    case MESA_FORMAT_B8G8R8X8_SRGB:
1360    case MESA_FORMAT_X8R8G8B8_SRGB:
1361       *datatype = GL_UNSIGNED_BYTE;
1362       *comps = 4;
1363       return;
1364
1365    case MESA_FORMAT_COUNT:
1366       assert(0);
1367       return;
1368    default:
1369       /* Warn if any formats are not handled */
1370       _mesa_problem(NULL, "bad format %s in _mesa_uncompressed_format_to_type_and_comps",
1371                     _mesa_get_format_name(format));
1372       assert(format == MESA_FORMAT_NONE ||
1373              _mesa_is_format_compressed(format));
1374       *datatype = 0;
1375       *comps = 1;
1376    }
1377 }
1378
1379 /**
1380  * Check if a mesa_format exactly matches a GL format/type combination
1381  * such that we can use memcpy() from one to the other.
1382  * \param mesa_format  a MESA_FORMAT_x value
1383  * \param format  the user-specified image format
1384  * \param type  the user-specified image datatype
1385  * \param swapBytes  typically the current pixel pack/unpack byteswap state
1386  * \param[out] error GL_NO_ERROR if format is an expected input.
1387  *                   GL_INVALID_ENUM if format is an unexpected input.
1388  * \return GL_TRUE if the formats match, GL_FALSE otherwise.
1389  */
1390 GLboolean
1391 _mesa_format_matches_format_and_type(mesa_format mesa_format,
1392                                      GLenum format, GLenum type,
1393                                      GLboolean swapBytes, GLenum *error)
1394 {
1395    const GLboolean littleEndian = _mesa_little_endian();
1396    if (error)
1397       *error = GL_NO_ERROR;
1398
1399    /* Note: When reading a GL format/type combination, the format lists channel
1400     * assignments from most significant channel in the type to least
1401     * significant.  A type with _REV indicates that the assignments are
1402     * swapped, so they are listed from least significant to most significant.
1403     *
1404     * Compressed formats will fall through and return GL_FALSE.
1405     *
1406     * For sanity, please keep this switch statement ordered the same as the
1407     * enums in formats.h.
1408     */
1409
1410    switch (mesa_format) {
1411
1412    case MESA_FORMAT_NONE:
1413    case MESA_FORMAT_COUNT:
1414       return GL_FALSE;
1415
1416    case MESA_FORMAT_A8B8G8R8_UNORM:
1417    case MESA_FORMAT_A8B8G8R8_SRGB:
1418       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1419          return GL_TRUE;
1420
1421       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
1422          return GL_TRUE;
1423
1424       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && !littleEndian)
1425          return GL_TRUE;
1426
1427       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV
1428           && !swapBytes)
1429          return GL_TRUE;
1430
1431       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8
1432           && swapBytes)
1433          return GL_TRUE;
1434
1435       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && littleEndian)
1436          return GL_TRUE;
1437
1438       return GL_FALSE;
1439
1440    case MESA_FORMAT_R8G8B8A8_UNORM:
1441    case MESA_FORMAT_R8G8B8A8_SRGB:
1442       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1443           !swapBytes)
1444          return GL_TRUE;
1445
1446       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1447          return GL_TRUE;
1448
1449       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && littleEndian)
1450          return GL_TRUE;
1451
1452       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8 &&
1453           !swapBytes)
1454          return GL_TRUE;
1455
1456       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1457           swapBytes)
1458          return GL_TRUE;
1459
1460       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && !littleEndian)
1461          return GL_TRUE;
1462
1463       return GL_FALSE;
1464
1465    case MESA_FORMAT_B8G8R8A8_UNORM:
1466    case MESA_FORMAT_B8G8R8A8_SRGB:
1467       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1468           !swapBytes)
1469          return GL_TRUE;
1470
1471       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1472          return GL_TRUE;
1473
1474       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && littleEndian)
1475          return GL_TRUE;
1476
1477       return GL_FALSE;
1478
1479    case MESA_FORMAT_A8R8G8B8_UNORM:
1480    case MESA_FORMAT_A8R8G8B8_SRGB:
1481       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1482          return GL_TRUE;
1483
1484       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1485           swapBytes)
1486          return GL_TRUE;
1487
1488       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && !littleEndian)
1489          return GL_TRUE;
1490
1491       return GL_FALSE;
1492
1493    case MESA_FORMAT_X8B8G8R8_UNORM:
1494    case MESA_FORMAT_R8G8B8X8_UNORM:
1495       return GL_FALSE;
1496
1497    case MESA_FORMAT_B8G8R8X8_UNORM:
1498    case MESA_FORMAT_X8R8G8B8_UNORM:
1499       return GL_FALSE;
1500
1501    case MESA_FORMAT_BGR_UNORM8:
1502    case MESA_FORMAT_BGR_SRGB8:
1503       return format == GL_BGR && type == GL_UNSIGNED_BYTE && littleEndian;
1504
1505    case MESA_FORMAT_RGB_UNORM8:
1506       return format == GL_RGB && type == GL_UNSIGNED_BYTE && littleEndian;
1507
1508    case MESA_FORMAT_B5G6R5_UNORM:
1509       return ((format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) ||
1510               (format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1511               !swapBytes;
1512
1513    case MESA_FORMAT_R5G6B5_UNORM:
1514       return ((format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5) ||
1515               (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1516               !swapBytes;
1517
1518    case MESA_FORMAT_B4G4R4A4_UNORM:
1519       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
1520          !swapBytes;
1521
1522    case MESA_FORMAT_A4R4G4B4_UNORM:
1523       return GL_FALSE;
1524
1525    case MESA_FORMAT_A1B5G5R5_UNORM:
1526       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1527          !swapBytes;
1528
1529    case MESA_FORMAT_B5G5R5A1_UNORM:
1530       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
1531          !swapBytes;
1532
1533    case MESA_FORMAT_A1R5G5B5_UNORM:
1534       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1535          !swapBytes;
1536
1537    case MESA_FORMAT_L4A4_UNORM:
1538       return GL_FALSE;
1539    case MESA_FORMAT_L8A8_UNORM:
1540    case MESA_FORMAT_L8A8_SRGB:
1541       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_BYTE && littleEndian;
1542    case MESA_FORMAT_A8L8_UNORM:
1543    case MESA_FORMAT_A8L8_SRGB:
1544       return GL_FALSE;
1545
1546    case MESA_FORMAT_L16A16_UNORM:
1547       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_SHORT && littleEndian && !swapBytes;
1548    case MESA_FORMAT_A16L16_UNORM:
1549       return GL_FALSE;
1550
1551    case MESA_FORMAT_B2G3R3_UNORM:
1552       return format == GL_RGB && type == GL_UNSIGNED_BYTE_3_3_2;
1553
1554    case MESA_FORMAT_R3G3B2_UNORM:
1555       return format == GL_RGB && type == GL_UNSIGNED_BYTE_2_3_3_REV;
1556
1557    case MESA_FORMAT_A4B4G4R4_UNORM:
1558       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1559          return GL_TRUE;
1560
1561       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1562          return GL_TRUE;
1563
1564       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1565          return GL_TRUE;
1566
1567       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1568          return GL_TRUE;
1569
1570       return GL_FALSE;
1571
1572    case MESA_FORMAT_R4G4B4A4_UNORM:
1573       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1574          return GL_TRUE;
1575
1576       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1577          return GL_TRUE;
1578
1579       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1580          return GL_TRUE;
1581
1582       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1583          return GL_TRUE;
1584
1585       return GL_FALSE;
1586
1587    case MESA_FORMAT_R5G5B5A1_UNORM:
1588       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
1589
1590    case MESA_FORMAT_A2B10G10R10_UNORM:
1591       return format == GL_RGBA && type == GL_UNSIGNED_INT_10_10_10_2;
1592
1593    case MESA_FORMAT_A2B10G10R10_UINT:
1594       return format == GL_RGBA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1595
1596    case MESA_FORMAT_A2R10G10B10_UNORM:
1597       return format == GL_BGRA && type == GL_UNSIGNED_INT_10_10_10_2;
1598
1599    case MESA_FORMAT_A2R10G10B10_UINT:
1600       return format == GL_BGRA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1601
1602    case MESA_FORMAT_A_UNORM8:
1603       return format == GL_ALPHA && type == GL_UNSIGNED_BYTE;
1604    case MESA_FORMAT_A_UNORM16:
1605       return format == GL_ALPHA && type == GL_UNSIGNED_SHORT && !swapBytes;
1606    case MESA_FORMAT_L_UNORM8:
1607    case MESA_FORMAT_L_SRGB8:
1608       return format == GL_LUMINANCE && type == GL_UNSIGNED_BYTE;
1609    case MESA_FORMAT_L_UNORM16:
1610       return format == GL_LUMINANCE && type == GL_UNSIGNED_SHORT && !swapBytes;
1611    case MESA_FORMAT_I_UNORM8:
1612       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1613    case MESA_FORMAT_I_UNORM16:
1614       return format == GL_RED && type == GL_UNSIGNED_SHORT && !swapBytes;
1615
1616    case MESA_FORMAT_YCBCR:
1617       return format == GL_YCBCR_MESA &&
1618              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian != swapBytes) ||
1619               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian == swapBytes));
1620    case MESA_FORMAT_YCBCR_REV:
1621       return format == GL_YCBCR_MESA &&
1622              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian == swapBytes) ||
1623               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian != swapBytes));
1624
1625    case MESA_FORMAT_R_UNORM8:
1626       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1627    case MESA_FORMAT_R8G8_UNORM:
1628       return format == GL_RG && type == GL_UNSIGNED_BYTE && littleEndian;
1629    case MESA_FORMAT_G8R8_UNORM:
1630       return GL_FALSE;
1631
1632    case MESA_FORMAT_R_UNORM16:
1633       return format == GL_RED && type == GL_UNSIGNED_SHORT &&
1634          !swapBytes;
1635    case MESA_FORMAT_R16G16_UNORM:
1636       return format == GL_RG && type == GL_UNSIGNED_SHORT && littleEndian &&
1637          !swapBytes;
1638    case MESA_FORMAT_G16R16_UNORM:
1639       return GL_FALSE;
1640
1641    case MESA_FORMAT_B10G10R10A2_UNORM:
1642       return format == GL_BGRA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1643          !swapBytes;
1644
1645    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1646       return format == GL_DEPTH_STENCIL && type == GL_UNSIGNED_INT_24_8 &&
1647          !swapBytes;
1648    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1649    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1650       return GL_FALSE;
1651
1652    case MESA_FORMAT_Z_UNORM16:
1653       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_SHORT &&
1654          !swapBytes;
1655
1656    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1657       return GL_FALSE;
1658
1659    case MESA_FORMAT_Z_UNORM32:
1660       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_INT &&
1661          !swapBytes;
1662
1663    case MESA_FORMAT_S_UINT8:
1664       return format == GL_STENCIL_INDEX && type == GL_UNSIGNED_BYTE;
1665
1666    case MESA_FORMAT_RGBA_FLOAT32:
1667       return format == GL_RGBA && type == GL_FLOAT && !swapBytes;
1668    case MESA_FORMAT_RGBA_FLOAT16:
1669       return format == GL_RGBA && type == GL_HALF_FLOAT && !swapBytes;
1670
1671    case MESA_FORMAT_RGB_FLOAT32:
1672       return format == GL_RGB && type == GL_FLOAT && !swapBytes;
1673    case MESA_FORMAT_RGB_FLOAT16:
1674       return format == GL_RGB && type == GL_HALF_FLOAT && !swapBytes;
1675
1676    case MESA_FORMAT_A_FLOAT32:
1677       return format == GL_ALPHA && type == GL_FLOAT && !swapBytes;
1678    case MESA_FORMAT_A_FLOAT16:
1679       return format == GL_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1680
1681    case MESA_FORMAT_L_FLOAT32:
1682       return format == GL_LUMINANCE && type == GL_FLOAT && !swapBytes;
1683    case MESA_FORMAT_L_FLOAT16:
1684       return format == GL_LUMINANCE && type == GL_HALF_FLOAT && !swapBytes;
1685
1686    case MESA_FORMAT_LA_FLOAT32:
1687       return format == GL_LUMINANCE_ALPHA && type == GL_FLOAT && !swapBytes;
1688    case MESA_FORMAT_LA_FLOAT16:
1689       return format == GL_LUMINANCE_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1690
1691    case MESA_FORMAT_I_FLOAT32:
1692       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1693    case MESA_FORMAT_I_FLOAT16:
1694       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1695
1696    case MESA_FORMAT_R_FLOAT32:
1697       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1698    case MESA_FORMAT_R_FLOAT16:
1699       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1700
1701    case MESA_FORMAT_RG_FLOAT32:
1702       return format == GL_RG && type == GL_FLOAT && !swapBytes;
1703    case MESA_FORMAT_RG_FLOAT16:
1704       return format == GL_RG && type == GL_HALF_FLOAT && !swapBytes;
1705
1706    case MESA_FORMAT_A_UINT8:
1707       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_BYTE;
1708    case MESA_FORMAT_A_UINT16:
1709       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_SHORT &&
1710              !swapBytes;
1711    case MESA_FORMAT_A_UINT32:
1712       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_INT &&
1713              !swapBytes;
1714    case MESA_FORMAT_A_SINT8:
1715       return format == GL_ALPHA_INTEGER && type == GL_BYTE;
1716    case MESA_FORMAT_A_SINT16:
1717       return format == GL_ALPHA_INTEGER && type == GL_SHORT && !swapBytes;
1718    case MESA_FORMAT_A_SINT32:
1719       return format == GL_ALPHA_INTEGER && type == GL_INT && !swapBytes;
1720
1721    case MESA_FORMAT_I_UINT8:
1722       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1723    case MESA_FORMAT_I_UINT16:
1724       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1725    case MESA_FORMAT_I_UINT32:
1726       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1727    case MESA_FORMAT_I_SINT8:
1728       return format == GL_RED_INTEGER && type == GL_BYTE;
1729    case MESA_FORMAT_I_SINT16:
1730       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1731    case MESA_FORMAT_I_SINT32:
1732       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1733
1734    case MESA_FORMAT_L_UINT8:
1735       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_BYTE;
1736    case MESA_FORMAT_L_UINT16:
1737       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_SHORT &&
1738              !swapBytes;
1739    case MESA_FORMAT_L_UINT32:
1740       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_INT &&
1741              !swapBytes;
1742    case MESA_FORMAT_L_SINT8:
1743       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_BYTE;
1744    case MESA_FORMAT_L_SINT16:
1745       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_SHORT &&
1746              !swapBytes;
1747    case MESA_FORMAT_L_SINT32:
1748       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_INT && !swapBytes;
1749
1750    case MESA_FORMAT_LA_UINT8:
1751       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1752              type == GL_UNSIGNED_BYTE && !swapBytes;
1753    case MESA_FORMAT_LA_UINT16:
1754       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1755              type == GL_UNSIGNED_SHORT && !swapBytes;
1756    case MESA_FORMAT_LA_UINT32:
1757       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1758              type == GL_UNSIGNED_INT && !swapBytes;
1759    case MESA_FORMAT_LA_SINT8:
1760       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_BYTE &&
1761              !swapBytes;
1762    case MESA_FORMAT_LA_SINT16:
1763       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_SHORT &&
1764              !swapBytes;
1765    case MESA_FORMAT_LA_SINT32:
1766       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_INT &&
1767              !swapBytes;
1768
1769    case MESA_FORMAT_R_SINT8:
1770       return format == GL_RED_INTEGER && type == GL_BYTE;
1771    case MESA_FORMAT_RG_SINT8:
1772       return format == GL_RG_INTEGER && type == GL_BYTE && !swapBytes;
1773    case MESA_FORMAT_RGB_SINT8:
1774       return format == GL_RGB_INTEGER && type == GL_BYTE && !swapBytes;
1775    case MESA_FORMAT_RGBA_SINT8:
1776       return format == GL_RGBA_INTEGER && type == GL_BYTE && !swapBytes;
1777    case MESA_FORMAT_R_SINT16:
1778       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1779    case MESA_FORMAT_RG_SINT16:
1780       return format == GL_RG_INTEGER && type == GL_SHORT && !swapBytes;
1781    case MESA_FORMAT_RGB_SINT16:
1782       return format == GL_RGB_INTEGER && type == GL_SHORT && !swapBytes;
1783    case MESA_FORMAT_RGBA_SINT16:
1784       return format == GL_RGBA_INTEGER && type == GL_SHORT && !swapBytes;
1785    case MESA_FORMAT_R_SINT32:
1786       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1787    case MESA_FORMAT_RG_SINT32:
1788       return format == GL_RG_INTEGER && type == GL_INT && !swapBytes;
1789    case MESA_FORMAT_RGB_SINT32:
1790       return format == GL_RGB_INTEGER && type == GL_INT && !swapBytes;
1791    case MESA_FORMAT_RGBA_SINT32:
1792       return format == GL_RGBA_INTEGER && type == GL_INT && !swapBytes;
1793
1794    case MESA_FORMAT_R_UINT8:
1795       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1796    case MESA_FORMAT_RG_UINT8:
1797       return format == GL_RG_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1798    case MESA_FORMAT_RGB_UINT8:
1799       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1800    case MESA_FORMAT_RGBA_UINT8:
1801       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_BYTE &&
1802              !swapBytes;
1803    case MESA_FORMAT_R_UINT16:
1804       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT &&
1805              !swapBytes;
1806    case MESA_FORMAT_RG_UINT16:
1807       return format == GL_RG_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1808    case MESA_FORMAT_RGB_UINT16:
1809       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT &&
1810              !swapBytes;
1811    case MESA_FORMAT_RGBA_UINT16:
1812       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT &&
1813              !swapBytes;
1814    case MESA_FORMAT_R_UINT32:
1815       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1816    case MESA_FORMAT_RG_UINT32:
1817       return format == GL_RG_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1818    case MESA_FORMAT_RGB_UINT32:
1819       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1820    case MESA_FORMAT_RGBA_UINT32:
1821       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1822
1823    case MESA_FORMAT_R_SNORM8:
1824       return format == GL_RED && type == GL_BYTE;
1825    case MESA_FORMAT_R8G8_SNORM:
1826       return format == GL_RG && type == GL_BYTE && littleEndian &&
1827              !swapBytes;
1828    case MESA_FORMAT_X8B8G8R8_SNORM:
1829       return GL_FALSE;
1830
1831    case MESA_FORMAT_A8B8G8R8_SNORM:
1832       if (format == GL_RGBA && type == GL_BYTE && !littleEndian)
1833          return GL_TRUE;
1834
1835       if (format == GL_ABGR_EXT && type == GL_BYTE && littleEndian)
1836          return GL_TRUE;
1837
1838       return GL_FALSE;
1839
1840    case MESA_FORMAT_R8G8B8A8_SNORM:
1841       if (format == GL_RGBA && type == GL_BYTE && littleEndian)
1842          return GL_TRUE;
1843
1844       if (format == GL_ABGR_EXT && type == GL_BYTE && !littleEndian)
1845          return GL_TRUE;
1846
1847       return GL_FALSE;
1848
1849    case MESA_FORMAT_R_SNORM16:
1850       return format == GL_RED && type == GL_SHORT &&
1851              !swapBytes;
1852    case MESA_FORMAT_R16G16_SNORM:
1853       return format == GL_RG && type == GL_SHORT && littleEndian && !swapBytes;
1854    case MESA_FORMAT_RGB_SNORM16:
1855       return format == GL_RGB && type == GL_SHORT && !swapBytes;
1856    case MESA_FORMAT_RGBA_SNORM16:
1857       return format == GL_RGBA && type == GL_SHORT && !swapBytes;
1858    case MESA_FORMAT_RGBA_UNORM16:
1859       return format == GL_RGBA && type == GL_UNSIGNED_SHORT &&
1860              !swapBytes;
1861
1862    case MESA_FORMAT_A_SNORM8:
1863       return format == GL_ALPHA && type == GL_BYTE;
1864    case MESA_FORMAT_L_SNORM8:
1865       return format == GL_LUMINANCE && type == GL_BYTE;
1866    case MESA_FORMAT_L8A8_SNORM:
1867       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
1868              littleEndian && !swapBytes;
1869    case MESA_FORMAT_A8L8_SNORM:
1870       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
1871              !littleEndian && !swapBytes;
1872    case MESA_FORMAT_I_SNORM8:
1873       return format == GL_RED && type == GL_BYTE;
1874    case MESA_FORMAT_A_SNORM16:
1875       return format == GL_ALPHA && type == GL_SHORT && !swapBytes;
1876    case MESA_FORMAT_L_SNORM16:
1877       return format == GL_LUMINANCE && type == GL_SHORT && !swapBytes;
1878    case MESA_FORMAT_LA_SNORM16:
1879       return format == GL_LUMINANCE_ALPHA && type == GL_SHORT &&
1880              littleEndian && !swapBytes;
1881    case MESA_FORMAT_I_SNORM16:
1882       return format == GL_RED && type == GL_SHORT && littleEndian &&
1883              !swapBytes;
1884
1885    case MESA_FORMAT_B10G10R10A2_UINT:
1886       return (format == GL_BGRA_INTEGER_EXT &&
1887               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1888               !swapBytes);
1889
1890    case MESA_FORMAT_R10G10B10A2_UINT:
1891       return (format == GL_RGBA_INTEGER_EXT &&
1892               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1893               !swapBytes);
1894
1895    case MESA_FORMAT_B5G6R5_UINT:
1896       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT_5_6_5;
1897
1898    case MESA_FORMAT_R5G6B5_UINT:
1899       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT_5_6_5_REV;
1900
1901    case MESA_FORMAT_B2G3R3_UINT:
1902       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE_3_3_2;
1903
1904    case MESA_FORMAT_R3G3B2_UINT:
1905       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE_2_3_3_REV;
1906
1907    case MESA_FORMAT_A4B4G4R4_UINT:
1908       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1909          return GL_TRUE;
1910
1911       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1912          return GL_TRUE;
1913       return GL_FALSE;
1914
1915    case MESA_FORMAT_R4G4B4A4_UINT:
1916       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1917          return GL_TRUE;
1918
1919       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1920          return GL_TRUE;
1921
1922       return GL_FALSE;
1923
1924    case MESA_FORMAT_B4G4R4A4_UINT:
1925       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
1926          !swapBytes;
1927
1928    case MESA_FORMAT_A4R4G4B4_UINT:
1929       return GL_FALSE;
1930
1931    case MESA_FORMAT_A1B5G5R5_UINT:
1932       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1933          !swapBytes;
1934
1935    case MESA_FORMAT_B5G5R5A1_UINT:
1936       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
1937          !swapBytes;
1938
1939    case MESA_FORMAT_A1R5G5B5_UINT:
1940       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1941          !swapBytes;
1942
1943    case MESA_FORMAT_R5G5B5A1_UINT:
1944       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
1945
1946    case MESA_FORMAT_A8B8G8R8_UINT:
1947       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1948          return GL_TRUE;
1949
1950       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
1951          return GL_TRUE;
1952       return GL_FALSE;
1953
1954    case MESA_FORMAT_A8R8G8B8_UINT:
1955       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 &&
1956           !swapBytes)
1957          return GL_TRUE;
1958
1959       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1960           swapBytes)
1961          return GL_TRUE;
1962
1963       return GL_FALSE;
1964
1965    case MESA_FORMAT_R8G8B8A8_UINT:
1966       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1967           !swapBytes)
1968          return GL_TRUE;
1969
1970       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1971          return GL_TRUE;
1972
1973       return GL_FALSE;
1974
1975    case MESA_FORMAT_B8G8R8A8_UINT:
1976       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1977           !swapBytes)
1978          return GL_TRUE;
1979
1980       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1981          return GL_TRUE;
1982
1983       return GL_FALSE;
1984
1985    case MESA_FORMAT_R9G9B9E5_FLOAT:
1986       return format == GL_RGB && type == GL_UNSIGNED_INT_5_9_9_9_REV &&
1987          !swapBytes;
1988
1989    case MESA_FORMAT_R11G11B10_FLOAT:
1990       return format == GL_RGB && type == GL_UNSIGNED_INT_10F_11F_11F_REV &&
1991          !swapBytes;
1992
1993    case MESA_FORMAT_Z_FLOAT32:
1994       return format == GL_DEPTH_COMPONENT && type == GL_FLOAT && !swapBytes;
1995
1996    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
1997       return format == GL_DEPTH_STENCIL &&
1998              type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV && !swapBytes;
1999
2000    case MESA_FORMAT_B4G4R4X4_UNORM:
2001    case MESA_FORMAT_B5G5R5X1_UNORM:
2002    case MESA_FORMAT_R8G8B8X8_SNORM:
2003    case MESA_FORMAT_R8G8B8X8_SRGB:
2004    case MESA_FORMAT_X8B8G8R8_SRGB:
2005    case MESA_FORMAT_RGBX_UINT8:
2006    case MESA_FORMAT_RGBX_SINT8:
2007    case MESA_FORMAT_B10G10R10X2_UNORM:
2008    case MESA_FORMAT_R10G10B10X2_UNORM:
2009    case MESA_FORMAT_RGBX_UNORM16:
2010    case MESA_FORMAT_RGBX_SNORM16:
2011    case MESA_FORMAT_RGBX_FLOAT16:
2012    case MESA_FORMAT_RGBX_UINT16:
2013    case MESA_FORMAT_RGBX_SINT16:
2014    case MESA_FORMAT_RGBX_FLOAT32:
2015    case MESA_FORMAT_RGBX_UINT32:
2016    case MESA_FORMAT_RGBX_SINT32:
2017       return GL_FALSE;
2018
2019    case MESA_FORMAT_R10G10B10A2_UNORM:
2020       return format == GL_RGBA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2021          !swapBytes;
2022
2023    case MESA_FORMAT_G8R8_SNORM:
2024       return format == GL_RG && type == GL_BYTE && !littleEndian &&
2025          !swapBytes;
2026
2027    case MESA_FORMAT_G16R16_SNORM:
2028       return format == GL_RG && type == GL_SHORT && !littleEndian &&
2029          !swapBytes;
2030
2031    case MESA_FORMAT_B8G8R8X8_SRGB:
2032    case MESA_FORMAT_X8R8G8B8_SRGB:
2033       return GL_FALSE;
2034    default:
2035       assert(_mesa_is_format_compressed(mesa_format));
2036       if (error)
2037          *error = GL_INVALID_ENUM;
2038    }
2039    return GL_FALSE;
2040 }
2041