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  * For an sRGB format, return the corresponding linear color space format.
 626  * For non-sRGB formats, return the format as-is.
 627  */
 628 mesa_format
 629 _mesa_get_srgb_format_linear(mesa_format format)
 630 {
 631    switch (format) {
 632    case MESA_FORMAT_BGR_SRGB8:
 633       format = MESA_FORMAT_BGR_UNORM8;
 634       break;
 635    case MESA_FORMAT_A8B8G8R8_SRGB:
 636       format = MESA_FORMAT_A8B8G8R8_UNORM;
 637       break;
 638    case MESA_FORMAT_B8G8R8A8_SRGB:
 639       format = MESA_FORMAT_B8G8R8A8_UNORM;
 640       break;
 641    case MESA_FORMAT_A8R8G8B8_SRGB:
 642       format = MESA_FORMAT_A8R8G8B8_UNORM;
 643       break;
 644    case MESA_FORMAT_R8G8B8A8_SRGB:
 645       format = MESA_FORMAT_R8G8B8A8_UNORM;
 646       break;
 647    case MESA_FORMAT_L_SRGB8:
 648       format = MESA_FORMAT_L_UNORM8;
 649       break;
 650    case MESA_FORMAT_L8A8_SRGB:
 651       format = MESA_FORMAT_L8A8_UNORM;
 652       break;
 653    case MESA_FORMAT_A8L8_SRGB:
 654       format = MESA_FORMAT_A8L8_UNORM;
 655       break;
 656    case MESA_FORMAT_SRGB_DXT1:
 657       format = MESA_FORMAT_RGB_DXT1;
 658       break;
 659    case MESA_FORMAT_SRGBA_DXT1:
 660       format = MESA_FORMAT_RGBA_DXT1;
 661       break;
 662    case MESA_FORMAT_SRGBA_DXT3:
 663       format = MESA_FORMAT_RGBA_DXT3;
 664       break;
 665    case MESA_FORMAT_SRGBA_DXT5:
 666       format = MESA_FORMAT_RGBA_DXT5;
 667       break;
 668    case MESA_FORMAT_R8G8B8X8_SRGB:
 669       format = MESA_FORMAT_R8G8B8X8_UNORM;
 670       break;
 671    case MESA_FORMAT_X8B8G8R8_SRGB:
 672       format = MESA_FORMAT_X8B8G8R8_UNORM;
 673       break;
 674    case MESA_FORMAT_ETC2_SRGB8:
 675       format = MESA_FORMAT_ETC2_RGB8;
 676       break;
 677    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 678       format = MESA_FORMAT_ETC2_RGBA8_EAC;
 679       break;
 680    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 681       format = MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1;
 682       break;
 683    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 684       format = MESA_FORMAT_BPTC_RGBA_UNORM;
 685       break;
 686    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4:
 687       format = MESA_FORMAT_RGBA_ASTC_4x4;
 688       break;
 689    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x4:
 690       format = MESA_FORMAT_RGBA_ASTC_5x4;
 691       break;
 692    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5:
 693       format = MESA_FORMAT_RGBA_ASTC_5x5;
 694       break;
 695    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x5:
 696       format = MESA_FORMAT_RGBA_ASTC_6x5;
 697       break;
 698    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6:
 699       format = MESA_FORMAT_RGBA_ASTC_6x6;
 700       break;
 701    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x5:
 702       format = MESA_FORMAT_RGBA_ASTC_8x5;
 703       break;
 704    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x6:
 705       format = MESA_FORMAT_RGBA_ASTC_8x6;
 706       break;
 707    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x8:
 708       format = MESA_FORMAT_RGBA_ASTC_8x8;
 709       break;
 710    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x5:
 711       format = MESA_FORMAT_RGBA_ASTC_10x5;
 712       break;
 713    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x6:
 714       format = MESA_FORMAT_RGBA_ASTC_10x6;
 715       break;
 716    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x8:
 717       format = MESA_FORMAT_RGBA_ASTC_10x8;
 718       break;
 719    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x10:
 720       format = MESA_FORMAT_RGBA_ASTC_10x10;
 721       break;
 722    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x10:
 723       format = MESA_FORMAT_RGBA_ASTC_12x10;
 724       break;
 725    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x12:
 726       format = MESA_FORMAT_RGBA_ASTC_12x12;
 727       break;
 728    case MESA_FORMAT_B8G8R8X8_SRGB:
 729       format = MESA_FORMAT_B8G8R8X8_UNORM;
 730       break;
 731    case MESA_FORMAT_X8R8G8B8_SRGB:
 732       format = MESA_FORMAT_X8R8G8B8_UNORM;
 733       break;
 734    default:
 735       break;
 736    }
 737    return format;
 738 }
 739
 740
 741 /**
 742  * If the given format is a compressed format, return a corresponding
 743  * uncompressed format.
 744  */
 745 mesa_format
 746 _mesa_get_uncompressed_format(mesa_format format)
 747 {
 748    switch (format) {
 749    case MESA_FORMAT_RGB_FXT1:
 750       return MESA_FORMAT_BGR_UNORM8;
 751    case MESA_FORMAT_RGBA_FXT1:
 752       return MESA_FORMAT_A8B8G8R8_UNORM;
 753    case MESA_FORMAT_RGB_DXT1:
 754    case MESA_FORMAT_SRGB_DXT1:
 755       return MESA_FORMAT_BGR_UNORM8;
 756    case MESA_FORMAT_RGBA_DXT1:
 757    case MESA_FORMAT_SRGBA_DXT1:
 758       return MESA_FORMAT_A8B8G8R8_UNORM;
 759    case MESA_FORMAT_RGBA_DXT3:
 760    case MESA_FORMAT_SRGBA_DXT3:
 761       return MESA_FORMAT_A8B8G8R8_UNORM;
 762    case MESA_FORMAT_RGBA_DXT5:
 763    case MESA_FORMAT_SRGBA_DXT5:
 764       return MESA_FORMAT_A8B8G8R8_UNORM;
 765    case MESA_FORMAT_R_RGTC1_UNORM:
 766       return MESA_FORMAT_R_UNORM8;
 767    case MESA_FORMAT_R_RGTC1_SNORM:
 768       return MESA_FORMAT_R_SNORM8;
 769    case MESA_FORMAT_RG_RGTC2_UNORM:
 770       return MESA_FORMAT_R8G8_UNORM;
 771    case MESA_FORMAT_RG_RGTC2_SNORM:
 772       return MESA_FORMAT_R8G8_SNORM;
 773    case MESA_FORMAT_L_LATC1_UNORM:
 774       return MESA_FORMAT_L_UNORM8;
 775    case MESA_FORMAT_L_LATC1_SNORM:
 776       return MESA_FORMAT_L_SNORM8;
 777    case MESA_FORMAT_LA_LATC2_UNORM:
 778       return MESA_FORMAT_L8A8_UNORM;
 779    case MESA_FORMAT_LA_LATC2_SNORM:
 780       return MESA_FORMAT_L8A8_SNORM;
 781    case MESA_FORMAT_ETC1_RGB8:
 782    case MESA_FORMAT_ETC2_RGB8:
 783    case MESA_FORMAT_ETC2_SRGB8:
 784       return MESA_FORMAT_BGR_UNORM8;
 785    case MESA_FORMAT_ETC2_RGBA8_EAC:
 786    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 787    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 788    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 789       return MESA_FORMAT_A8B8G8R8_UNORM;
 790    case MESA_FORMAT_ETC2_R11_EAC:
 791    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 792       return MESA_FORMAT_R_UNORM16;
 793    case MESA_FORMAT_ETC2_RG11_EAC:
 794    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 795       return MESA_FORMAT_R16G16_UNORM;
 796    case MESA_FORMAT_BPTC_RGBA_UNORM:
 797    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 798       return MESA_FORMAT_A8B8G8R8_UNORM;
 799    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
 800    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
 801       return MESA_FORMAT_RGB_FLOAT32;
 802    default:
 803 #ifdef DEBUG
 804       assert(!_mesa_is_format_compressed(format));
 805 #endif
 806       return format;
 807    }
 808 }
 809
 810
 811 GLuint
 812 _mesa_format_num_components(mesa_format format)
 813 {
 814    const struct gl_format_info *info = _mesa_get_format_info(format);
 815    return ((info->RedBits > 0) +
 816            (info->GreenBits > 0) +
 817            (info->BlueBits > 0) +
 818            (info->AlphaBits > 0) +
 819            (info->LuminanceBits > 0) +
 820            (info->IntensityBits > 0) +
 821            (info->DepthBits > 0) +
 822            (info->StencilBits > 0));
 823 }
 824
 825
 826 /**
 827  * Returns true if a color format has data stored in the R/G/B/A channels,
 828  * given an index from 0 to 3.
 829  */
 830 bool
 831 _mesa_format_has_color_component(mesa_format format, int component)
 832 {
 833    const struct gl_format_info *info = _mesa_get_format_info(format);
 834
 835    assert(info->BaseFormat != GL_DEPTH_COMPONENT &&
 836           info->BaseFormat != GL_DEPTH_STENCIL &&
 837           info->BaseFormat != GL_STENCIL_INDEX);
 838
 839    switch (component) {
 840    case 0:
 841       return (info->RedBits + info->IntensityBits + info->LuminanceBits) > 0;
 842    case 1:
 843       return (info->GreenBits + info->IntensityBits + info->LuminanceBits) > 0;
 844    case 2:
 845       return (info->BlueBits + info->IntensityBits + info->LuminanceBits) > 0;
 846    case 3:
 847       return (info->AlphaBits + info->IntensityBits) > 0;
 848    default:
 849       assert(!"Invalid color component: must be 0..3");
 850       return false;
 851    }
 852 }
 853
 854
 855 /**
 856  * Return number of bytes needed to store an image of the given size
 857  * in the given format.
 858  */
 859 GLuint
 860 _mesa_format_image_size(mesa_format format, GLsizei width,
 861                         GLsizei height, GLsizei depth)
 862 {
 863    const struct gl_format_info *info = _mesa_get_format_info(format);
 864    GLuint sz;
 865    /* Strictly speaking, a conditional isn't needed here */
 866    if (info->BlockWidth > 1 || info->BlockHeight > 1 || info->BlockDepth > 1) {
 867       /* compressed format (2D only for now) */
 868       const GLuint bw = info->BlockWidth;
 869       const GLuint bh = info->BlockHeight;
 870       const GLuint bd = info->BlockDepth;
 871       const GLuint wblocks = (width + bw - 1) / bw;
 872       const GLuint hblocks = (height + bh - 1) / bh;
 873       const GLuint dblocks = (depth + bd - 1) / bd;
 874       sz = wblocks * hblocks * dblocks * info->BytesPerBlock;
 875    } else
 876       /* non-compressed */
 877       sz = width * height * depth * info->BytesPerBlock;
 878
 879    return sz;
 880 }
 881
 882
 883 /**
 884  * Same as _mesa_format_image_size() but returns a 64-bit value to
 885  * accommodate very large textures.
 886  */
 887 uint64_t
 888 _mesa_format_image_size64(mesa_format format, GLsizei width,
 889                           GLsizei height, GLsizei depth)
 890 {
 891    const struct gl_format_info *info = _mesa_get_format_info(format);
 892    uint64_t sz;
 893    /* Strictly speaking, a conditional isn't needed here */
 894    if (info->BlockWidth > 1 || info->BlockHeight > 1 || info->BlockDepth > 1) {
 895       /* compressed format (2D only for now) */
 896       const uint64_t bw = info->BlockWidth;
 897       const uint64_t bh = info->BlockHeight;
 898       const uint64_t bd = info->BlockDepth;
 899       const uint64_t wblocks = (width + bw - 1) / bw;
 900       const uint64_t hblocks = (height + bh - 1) / bh;
 901       const uint64_t dblocks = (depth + bd - 1) / bd;
 902       sz = wblocks * hblocks * dblocks * info->BytesPerBlock;
 903    } else
 904       /* non-compressed */
 905       sz = ((uint64_t) width * (uint64_t) height *
 906             (uint64_t) depth * info->BytesPerBlock);
 907
 908    return sz;
 909 }
 910
 911
 912
 913 GLint
 914 _mesa_format_row_stride(mesa_format format, GLsizei width)
 915 {
 916    const struct gl_format_info *info = _mesa_get_format_info(format);
 917    /* Strictly speaking, a conditional isn't needed here */
 918    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 919       /* compressed format */
 920       const GLuint bw = info->BlockWidth;
 921       const GLuint wblocks = (width + bw - 1) / bw;
 922       const GLint stride = wblocks * info->BytesPerBlock;
 923       return stride;
 924    }
 925    else {
 926       const GLint stride = width * info->BytesPerBlock;
 927       return stride;
 928    }
 929 }
 930
 931
 932
 933 /**
 934  * Return datatype and number of components per texel for the given
 935  * uncompressed mesa_format. Only used for mipmap generation code.
 936  */
 937 void
 938 _mesa_uncompressed_format_to_type_and_comps(mesa_format format,
 939                                GLenum *datatype, GLuint *comps)
 940 {
 941    switch (format) {
 942    case MESA_FORMAT_A8B8G8R8_UNORM:
 943    case MESA_FORMAT_R8G8B8A8_UNORM:
 944    case MESA_FORMAT_B8G8R8A8_UNORM:
 945    case MESA_FORMAT_A8R8G8B8_UNORM:
 946    case MESA_FORMAT_X8B8G8R8_UNORM:
 947    case MESA_FORMAT_R8G8B8X8_UNORM:
 948    case MESA_FORMAT_B8G8R8X8_UNORM:
 949    case MESA_FORMAT_X8R8G8B8_UNORM:
 950    case MESA_FORMAT_A8B8G8R8_UINT:
 951    case MESA_FORMAT_R8G8B8A8_UINT:
 952    case MESA_FORMAT_B8G8R8A8_UINT:
 953    case MESA_FORMAT_A8R8G8B8_UINT:
 954       *datatype = GL_UNSIGNED_BYTE;
 955       *comps = 4;
 956       return;
 957    case MESA_FORMAT_BGR_UNORM8:
 958    case MESA_FORMAT_RGB_UNORM8:
 959       *datatype = GL_UNSIGNED_BYTE;
 960       *comps = 3;
 961       return;
 962    case MESA_FORMAT_B5G6R5_UNORM:
 963    case MESA_FORMAT_R5G6B5_UNORM:
 964    case MESA_FORMAT_B5G6R5_UINT:
 965    case MESA_FORMAT_R5G6B5_UINT:
 966       *datatype = GL_UNSIGNED_SHORT_5_6_5;
 967       *comps = 3;
 968       return;
 969
 970    case MESA_FORMAT_B4G4R4A4_UNORM:
 971    case MESA_FORMAT_A4R4G4B4_UNORM:
 972    case MESA_FORMAT_B4G4R4X4_UNORM:
 973    case MESA_FORMAT_B4G4R4A4_UINT:
 974    case MESA_FORMAT_A4R4G4B4_UINT:
 975       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 976       *comps = 4;
 977       return;
 978
 979    case MESA_FORMAT_B5G5R5A1_UNORM:
 980    case MESA_FORMAT_A1R5G5B5_UNORM:
 981    case MESA_FORMAT_B5G5R5X1_UNORM:
 982    case MESA_FORMAT_B5G5R5A1_UINT:
 983    case MESA_FORMAT_A1R5G5B5_UINT:
 984       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 985       *comps = 4;
 986       return;
 987
 988    case MESA_FORMAT_B10G10R10A2_UNORM:
 989       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
 990       *comps = 4;
 991       return;
 992
 993    case MESA_FORMAT_A1B5G5R5_UNORM:
 994    case MESA_FORMAT_A1B5G5R5_UINT:
 995       *datatype = GL_UNSIGNED_SHORT_5_5_5_1;
 996       *comps = 4;
 997       return;
 998
 999    case MESA_FORMAT_L4A4_UNORM:
1000       *datatype = MESA_UNSIGNED_BYTE_4_4;
1001       *comps = 2;
1002       return;
1003
1004    case MESA_FORMAT_L8A8_UNORM:
1005    case MESA_FORMAT_A8L8_UNORM:
1006    case MESA_FORMAT_R8G8_UNORM:
1007    case MESA_FORMAT_G8R8_UNORM:
1008       *datatype = GL_UNSIGNED_BYTE;
1009       *comps = 2;
1010       return;
1011
1012    case MESA_FORMAT_L16A16_UNORM:
1013    case MESA_FORMAT_A16L16_UNORM:
1014    case MESA_FORMAT_R16G16_UNORM:
1015    case MESA_FORMAT_G16R16_UNORM:
1016       *datatype = GL_UNSIGNED_SHORT;
1017       *comps = 2;
1018       return;
1019
1020    case MESA_FORMAT_R_UNORM16:
1021    case MESA_FORMAT_A_UNORM16:
1022    case MESA_FORMAT_L_UNORM16:
1023    case MESA_FORMAT_I_UNORM16:
1024       *datatype = GL_UNSIGNED_SHORT;
1025       *comps = 1;
1026       return;
1027
1028    case MESA_FORMAT_R3G3B2_UNORM:
1029    case MESA_FORMAT_R3G3B2_UINT:
1030       *datatype = GL_UNSIGNED_BYTE_2_3_3_REV;
1031       *comps = 3;
1032       return;
1033    case MESA_FORMAT_A4B4G4R4_UNORM:
1034    case MESA_FORMAT_A4B4G4R4_UINT:
1035       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
1036       *comps = 4;
1037       return;
1038
1039    case MESA_FORMAT_R4G4B4A4_UNORM:
1040    case MESA_FORMAT_R4G4B4A4_UINT:
1041       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
1042       *comps = 4;
1043       return;
1044    case MESA_FORMAT_R5G5B5A1_UNORM:
1045    case MESA_FORMAT_R5G5B5A1_UINT:
1046       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
1047       *comps = 4;
1048       return;
1049    case MESA_FORMAT_A2B10G10R10_UNORM:
1050    case MESA_FORMAT_A2B10G10R10_UINT:
1051       *datatype = GL_UNSIGNED_INT_10_10_10_2;
1052       *comps = 4;
1053       return;
1054    case MESA_FORMAT_A2R10G10B10_UNORM:
1055    case MESA_FORMAT_A2R10G10B10_UINT:
1056       *datatype = GL_UNSIGNED_INT_10_10_10_2;
1057       *comps = 4;
1058       return;
1059
1060    case MESA_FORMAT_B2G3R3_UNORM:
1061    case MESA_FORMAT_B2G3R3_UINT:
1062       *datatype = GL_UNSIGNED_BYTE_3_3_2;
1063       *comps = 3;
1064       return;
1065
1066    case MESA_FORMAT_A_UNORM8:
1067    case MESA_FORMAT_L_UNORM8:
1068    case MESA_FORMAT_I_UNORM8:
1069    case MESA_FORMAT_R_UNORM8:
1070    case MESA_FORMAT_S_UINT8:
1071       *datatype = GL_UNSIGNED_BYTE;
1072       *comps = 1;
1073       return;
1074
1075    case MESA_FORMAT_YCBCR:
1076    case MESA_FORMAT_YCBCR_REV:
1077       *datatype = GL_UNSIGNED_SHORT;
1078       *comps = 2;
1079       return;
1080
1081    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1082       *datatype = GL_UNSIGNED_INT_24_8_MESA;
1083       *comps = 2;
1084       return;
1085
1086    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1087       *datatype = GL_UNSIGNED_INT_8_24_REV_MESA;
1088       *comps = 2;
1089       return;
1090
1091    case MESA_FORMAT_Z_UNORM16:
1092       *datatype = GL_UNSIGNED_SHORT;
1093       *comps = 1;
1094       return;
1095
1096    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1097       *datatype = GL_UNSIGNED_INT;
1098       *comps = 1;
1099       return;
1100
1101    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1102       *datatype = GL_UNSIGNED_INT;
1103       *comps = 1;
1104       return;
1105
1106    case MESA_FORMAT_Z_UNORM32:
1107       *datatype = GL_UNSIGNED_INT;
1108       *comps = 1;
1109       return;
1110
1111    case MESA_FORMAT_Z_FLOAT32:
1112       *datatype = GL_FLOAT;
1113       *comps = 1;
1114       return;
1115
1116    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
1117       *datatype = GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
1118       *comps = 1;
1119       return;
1120
1121    case MESA_FORMAT_R_SNORM8:
1122    case MESA_FORMAT_A_SNORM8:
1123    case MESA_FORMAT_L_SNORM8:
1124    case MESA_FORMAT_I_SNORM8:
1125       *datatype = GL_BYTE;
1126       *comps = 1;
1127       return;
1128    case MESA_FORMAT_R8G8_SNORM:
1129    case MESA_FORMAT_L8A8_SNORM:
1130    case MESA_FORMAT_A8L8_SNORM:
1131       *datatype = GL_BYTE;
1132       *comps = 2;
1133       return;
1134    case MESA_FORMAT_A8B8G8R8_SNORM:
1135    case MESA_FORMAT_R8G8B8A8_SNORM:
1136    case MESA_FORMAT_X8B8G8R8_SNORM:
1137       *datatype = GL_BYTE;
1138       *comps = 4;
1139       return;
1140
1141    case MESA_FORMAT_RGBA_UNORM16:
1142       *datatype = GL_UNSIGNED_SHORT;
1143       *comps = 4;
1144       return;
1145
1146    case MESA_FORMAT_R_SNORM16:
1147    case MESA_FORMAT_A_SNORM16:
1148    case MESA_FORMAT_L_SNORM16:
1149    case MESA_FORMAT_I_SNORM16:
1150       *datatype = GL_SHORT;
1151       *comps = 1;
1152       return;
1153    case MESA_FORMAT_R16G16_SNORM:
1154    case MESA_FORMAT_LA_SNORM16:
1155       *datatype = GL_SHORT;
1156       *comps = 2;
1157       return;
1158    case MESA_FORMAT_RGB_SNORM16:
1159       *datatype = GL_SHORT;
1160       *comps = 3;
1161       return;
1162    case MESA_FORMAT_RGBA_SNORM16:
1163       *datatype = GL_SHORT;
1164       *comps = 4;
1165       return;
1166
1167    case MESA_FORMAT_BGR_SRGB8:
1168       *datatype = GL_UNSIGNED_BYTE;
1169       *comps = 3;
1170       return;
1171    case MESA_FORMAT_A8B8G8R8_SRGB:
1172    case MESA_FORMAT_B8G8R8A8_SRGB:
1173    case MESA_FORMAT_A8R8G8B8_SRGB:
1174    case MESA_FORMAT_R8G8B8A8_SRGB:
1175       *datatype = GL_UNSIGNED_BYTE;
1176       *comps = 4;
1177       return;
1178    case MESA_FORMAT_L_SRGB8:
1179       *datatype = GL_UNSIGNED_BYTE;
1180       *comps = 1;
1181       return;
1182    case MESA_FORMAT_L8A8_SRGB:
1183    case MESA_FORMAT_A8L8_SRGB:
1184       *datatype = GL_UNSIGNED_BYTE;
1185       *comps = 2;
1186       return;
1187
1188    case MESA_FORMAT_RGBA_FLOAT32:
1189       *datatype = GL_FLOAT;
1190       *comps = 4;
1191       return;
1192    case MESA_FORMAT_RGBA_FLOAT16:
1193       *datatype = GL_HALF_FLOAT_ARB;
1194       *comps = 4;
1195       return;
1196    case MESA_FORMAT_RGB_FLOAT32:
1197       *datatype = GL_FLOAT;
1198       *comps = 3;
1199       return;
1200    case MESA_FORMAT_RGB_FLOAT16:
1201       *datatype = GL_HALF_FLOAT_ARB;
1202       *comps = 3;
1203       return;
1204    case MESA_FORMAT_LA_FLOAT32:
1205    case MESA_FORMAT_RG_FLOAT32:
1206       *datatype = GL_FLOAT;
1207       *comps = 2;
1208       return;
1209    case MESA_FORMAT_LA_FLOAT16:
1210    case MESA_FORMAT_RG_FLOAT16:
1211       *datatype = GL_HALF_FLOAT_ARB;
1212       *comps = 2;
1213       return;
1214    case MESA_FORMAT_A_FLOAT32:
1215    case MESA_FORMAT_L_FLOAT32:
1216    case MESA_FORMAT_I_FLOAT32:
1217    case MESA_FORMAT_R_FLOAT32:
1218       *datatype = GL_FLOAT;
1219       *comps = 1;
1220       return;
1221    case MESA_FORMAT_A_FLOAT16:
1222    case MESA_FORMAT_L_FLOAT16:
1223    case MESA_FORMAT_I_FLOAT16:
1224    case MESA_FORMAT_R_FLOAT16:
1225       *datatype = GL_HALF_FLOAT_ARB;
1226       *comps = 1;
1227       return;
1228
1229    case MESA_FORMAT_A_UINT8:
1230    case MESA_FORMAT_L_UINT8:
1231    case MESA_FORMAT_I_UINT8:
1232       *datatype = GL_UNSIGNED_BYTE;
1233       *comps = 1;
1234       return;
1235    case MESA_FORMAT_LA_UINT8:
1236       *datatype = GL_UNSIGNED_BYTE;
1237       *comps = 2;
1238       return;
1239
1240    case MESA_FORMAT_A_UINT16:
1241    case MESA_FORMAT_L_UINT16:
1242    case MESA_FORMAT_I_UINT16:
1243       *datatype = GL_UNSIGNED_SHORT;
1244       *comps = 1;
1245       return;
1246    case MESA_FORMAT_LA_UINT16:
1247       *datatype = GL_UNSIGNED_SHORT;
1248       *comps = 2;
1249       return;
1250    case MESA_FORMAT_A_UINT32:
1251    case MESA_FORMAT_L_UINT32:
1252    case MESA_FORMAT_I_UINT32:
1253       *datatype = GL_UNSIGNED_INT;
1254       *comps = 1;
1255       return;
1256    case MESA_FORMAT_LA_UINT32:
1257       *datatype = GL_UNSIGNED_INT;
1258       *comps = 2;
1259       return;
1260    case MESA_FORMAT_A_SINT8:
1261    case MESA_FORMAT_L_SINT8:
1262    case MESA_FORMAT_I_SINT8:
1263       *datatype = GL_BYTE;
1264       *comps = 1;
1265       return;
1266    case MESA_FORMAT_LA_SINT8:
1267       *datatype = GL_BYTE;
1268       *comps = 2;
1269       return;
1270
1271    case MESA_FORMAT_A_SINT16:
1272    case MESA_FORMAT_L_SINT16:
1273    case MESA_FORMAT_I_SINT16:
1274       *datatype = GL_SHORT;
1275       *comps = 1;
1276       return;
1277    case MESA_FORMAT_LA_SINT16:
1278       *datatype = GL_SHORT;
1279       *comps = 2;
1280       return;
1281
1282    case MESA_FORMAT_A_SINT32:
1283    case MESA_FORMAT_L_SINT32:
1284    case MESA_FORMAT_I_SINT32:
1285       *datatype = GL_INT;
1286       *comps = 1;
1287       return;
1288    case MESA_FORMAT_LA_SINT32:
1289       *datatype = GL_INT;
1290       *comps = 2;
1291       return;
1292
1293    case MESA_FORMAT_R_SINT8:
1294       *datatype = GL_BYTE;
1295       *comps = 1;
1296       return;
1297    case MESA_FORMAT_RG_SINT8:
1298       *datatype = GL_BYTE;
1299       *comps = 2;
1300       return;
1301    case MESA_FORMAT_RGB_SINT8:
1302       *datatype = GL_BYTE;
1303       *comps = 3;
1304       return;
1305    case MESA_FORMAT_RGBA_SINT8:
1306       *datatype = GL_BYTE;
1307       *comps = 4;
1308       return;
1309    case MESA_FORMAT_R_SINT16:
1310       *datatype = GL_SHORT;
1311       *comps = 1;
1312       return;
1313    case MESA_FORMAT_RG_SINT16:
1314       *datatype = GL_SHORT;
1315       *comps = 2;
1316       return;
1317    case MESA_FORMAT_RGB_SINT16:
1318       *datatype = GL_SHORT;
1319       *comps = 3;
1320       return;
1321    case MESA_FORMAT_RGBA_SINT16:
1322       *datatype = GL_SHORT;
1323       *comps = 4;
1324       return;
1325    case MESA_FORMAT_R_SINT32:
1326       *datatype = GL_INT;
1327       *comps = 1;
1328       return;
1329    case MESA_FORMAT_RG_SINT32:
1330       *datatype = GL_INT;
1331       *comps = 2;
1332       return;
1333    case MESA_FORMAT_RGB_SINT32:
1334       *datatype = GL_INT;
1335       *comps = 3;
1336       return;
1337    case MESA_FORMAT_RGBA_SINT32:
1338       *datatype = GL_INT;
1339       *comps = 4;
1340       return;
1341
1342    /**
1343     * \name Non-normalized unsigned integer formats.
1344     */
1345    case MESA_FORMAT_R_UINT8:
1346       *datatype = GL_UNSIGNED_BYTE;
1347       *comps = 1;
1348       return;
1349    case MESA_FORMAT_RG_UINT8:
1350       *datatype = GL_UNSIGNED_BYTE;
1351       *comps = 2;
1352       return;
1353    case MESA_FORMAT_RGB_UINT8:
1354       *datatype = GL_UNSIGNED_BYTE;
1355       *comps = 3;
1356       return;
1357    case MESA_FORMAT_RGBA_UINT8:
1358       *datatype = GL_UNSIGNED_BYTE;
1359       *comps = 4;
1360       return;
1361    case MESA_FORMAT_R_UINT16:
1362       *datatype = GL_UNSIGNED_SHORT;
1363       *comps = 1;
1364       return;
1365    case MESA_FORMAT_RG_UINT16:
1366       *datatype = GL_UNSIGNED_SHORT;
1367       *comps = 2;
1368       return;
1369    case MESA_FORMAT_RGB_UINT16:
1370       *datatype = GL_UNSIGNED_SHORT;
1371       *comps = 3;
1372       return;
1373    case MESA_FORMAT_RGBA_UINT16:
1374       *datatype = GL_UNSIGNED_SHORT;
1375       *comps = 4;
1376       return;
1377    case MESA_FORMAT_R_UINT32:
1378       *datatype = GL_UNSIGNED_INT;
1379       *comps = 1;
1380       return;
1381    case MESA_FORMAT_RG_UINT32:
1382       *datatype = GL_UNSIGNED_INT;
1383       *comps = 2;
1384       return;
1385    case MESA_FORMAT_RGB_UINT32:
1386       *datatype = GL_UNSIGNED_INT;
1387       *comps = 3;
1388       return;
1389    case MESA_FORMAT_RGBA_UINT32:
1390       *datatype = GL_UNSIGNED_INT;
1391       *comps = 4;
1392       return;
1393
1394    case MESA_FORMAT_R9G9B9E5_FLOAT:
1395       *datatype = GL_UNSIGNED_INT_5_9_9_9_REV;
1396       *comps = 3;
1397       return;
1398
1399    case MESA_FORMAT_R11G11B10_FLOAT:
1400       *datatype = GL_UNSIGNED_INT_10F_11F_11F_REV;
1401       *comps = 3;
1402       return;
1403
1404    case MESA_FORMAT_B10G10R10A2_UINT:
1405    case MESA_FORMAT_R10G10B10A2_UINT:
1406       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1407       *comps = 4;
1408       return;
1409
1410    case MESA_FORMAT_R8G8B8X8_SRGB:
1411    case MESA_FORMAT_X8B8G8R8_SRGB:
1412    case MESA_FORMAT_RGBX_UINT8:
1413       *datatype = GL_UNSIGNED_BYTE;
1414       *comps = 4;
1415       return;
1416
1417    case MESA_FORMAT_R8G8B8X8_SNORM:
1418    case MESA_FORMAT_RGBX_SINT8:
1419       *datatype = GL_BYTE;
1420       *comps = 4;
1421       return;
1422
1423    case MESA_FORMAT_B10G10R10X2_UNORM:
1424    case MESA_FORMAT_R10G10B10X2_UNORM:
1425       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1426       *comps = 4;
1427       return;
1428
1429    case MESA_FORMAT_RGBX_UNORM16:
1430    case MESA_FORMAT_RGBX_UINT16:
1431       *datatype = GL_UNSIGNED_SHORT;
1432       *comps = 4;
1433       return;
1434
1435    case MESA_FORMAT_RGBX_SNORM16:
1436    case MESA_FORMAT_RGBX_SINT16:
1437       *datatype = GL_SHORT;
1438       *comps = 4;
1439       return;
1440
1441    case MESA_FORMAT_RGBX_FLOAT16:
1442       *datatype = GL_HALF_FLOAT;
1443       *comps = 4;
1444       return;
1445
1446    case MESA_FORMAT_RGBX_FLOAT32:
1447       *datatype = GL_FLOAT;
1448       *comps = 4;
1449       return;
1450
1451    case MESA_FORMAT_RGBX_UINT32:
1452       *datatype = GL_UNSIGNED_INT;
1453       *comps = 4;
1454       return;
1455
1456    case MESA_FORMAT_RGBX_SINT32:
1457       *datatype = GL_INT;
1458       *comps = 4;
1459       return;
1460
1461    case MESA_FORMAT_R10G10B10A2_UNORM:
1462       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1463       *comps = 4;
1464       return;
1465
1466    case MESA_FORMAT_G8R8_SNORM:
1467       *datatype = GL_BYTE;
1468       *comps = 2;
1469       return;
1470
1471    case MESA_FORMAT_G16R16_SNORM:
1472       *datatype = GL_SHORT;
1473       *comps = 2;
1474       return;
1475
1476    case MESA_FORMAT_B8G8R8X8_SRGB:
1477    case MESA_FORMAT_X8R8G8B8_SRGB:
1478       *datatype = GL_UNSIGNED_BYTE;
1479       *comps = 4;
1480       return;
1481
1482    case MESA_FORMAT_COUNT:
1483       assert(0);
1484       return;
1485    default:
1486       /* Warn if any formats are not handled */
1487       _mesa_problem(NULL, "bad format %s in _mesa_uncompressed_format_to_type_and_comps",
1488                     _mesa_get_format_name(format));
1489       assert(format == MESA_FORMAT_NONE ||
1490              _mesa_is_format_compressed(format));
1491       *datatype = 0;
1492       *comps = 1;
1493    }
1494 }
1495
1496 /**
1497  * Check if a mesa_format exactly matches a GL format/type combination
1498  * such that we can use memcpy() from one to the other.
1499  * \param mesa_format  a MESA_FORMAT_x value
1500  * \param format  the user-specified image format
1501  * \param type  the user-specified image datatype
1502  * \param swapBytes  typically the current pixel pack/unpack byteswap state
1503  * \param[out] error GL_NO_ERROR if format is an expected input.
1504  *                   GL_INVALID_ENUM if format is an unexpected input.
1505  * \return GL_TRUE if the formats match, GL_FALSE otherwise.
1506  */
1507 GLboolean
1508 _mesa_format_matches_format_and_type(mesa_format mesa_format,
1509                                      GLenum format, GLenum type,
1510                                      GLboolean swapBytes, GLenum *error)
1511 {
1512    const GLboolean littleEndian = _mesa_little_endian();
1513    if (error)
1514       *error = GL_NO_ERROR;
1515
1516    /* Note: When reading a GL format/type combination, the format lists channel
1517     * assignments from most significant channel in the type to least
1518     * significant.  A type with _REV indicates that the assignments are
1519     * swapped, so they are listed from least significant to most significant.
1520     *
1521     * Compressed formats will fall through and return GL_FALSE.
1522     *
1523     * For sanity, please keep this switch statement ordered the same as the
1524     * enums in formats.h.
1525     */
1526
1527    switch (mesa_format) {
1528
1529    case MESA_FORMAT_NONE:
1530    case MESA_FORMAT_COUNT:
1531       return GL_FALSE;
1532
1533    case MESA_FORMAT_A8B8G8R8_UNORM:
1534    case MESA_FORMAT_A8B8G8R8_SRGB:
1535       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1536          return GL_TRUE;
1537
1538       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
1539          return GL_TRUE;
1540
1541       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && !littleEndian)
1542          return GL_TRUE;
1543
1544       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV
1545           && !swapBytes)
1546          return GL_TRUE;
1547
1548       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8
1549           && swapBytes)
1550          return GL_TRUE;
1551
1552       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && littleEndian)
1553          return GL_TRUE;
1554
1555       return GL_FALSE;
1556
1557    case MESA_FORMAT_R8G8B8A8_UNORM:
1558    case MESA_FORMAT_R8G8B8A8_SRGB:
1559       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1560           !swapBytes)
1561          return GL_TRUE;
1562
1563       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1564          return GL_TRUE;
1565
1566       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && littleEndian)
1567          return GL_TRUE;
1568
1569       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8 &&
1570           !swapBytes)
1571          return GL_TRUE;
1572
1573       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1574           swapBytes)
1575          return GL_TRUE;
1576
1577       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && !littleEndian)
1578          return GL_TRUE;
1579
1580       return GL_FALSE;
1581
1582    case MESA_FORMAT_B8G8R8A8_UNORM:
1583    case MESA_FORMAT_B8G8R8A8_SRGB:
1584       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1585           !swapBytes)
1586          return GL_TRUE;
1587
1588       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1589          return GL_TRUE;
1590
1591       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && littleEndian)
1592          return GL_TRUE;
1593
1594       return GL_FALSE;
1595
1596    case MESA_FORMAT_A8R8G8B8_UNORM:
1597    case MESA_FORMAT_A8R8G8B8_SRGB:
1598       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1599          return GL_TRUE;
1600
1601       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1602           swapBytes)
1603          return GL_TRUE;
1604
1605       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && !littleEndian)
1606          return GL_TRUE;
1607
1608       return GL_FALSE;
1609
1610    case MESA_FORMAT_X8B8G8R8_UNORM:
1611    case MESA_FORMAT_R8G8B8X8_UNORM:
1612       return GL_FALSE;
1613
1614    case MESA_FORMAT_B8G8R8X8_UNORM:
1615    case MESA_FORMAT_X8R8G8B8_UNORM:
1616       return GL_FALSE;
1617
1618    case MESA_FORMAT_BGR_UNORM8:
1619    case MESA_FORMAT_BGR_SRGB8:
1620       return format == GL_BGR && type == GL_UNSIGNED_BYTE && littleEndian;
1621
1622    case MESA_FORMAT_RGB_UNORM8:
1623       return format == GL_RGB && type == GL_UNSIGNED_BYTE && littleEndian;
1624
1625    case MESA_FORMAT_B5G6R5_UNORM:
1626       return ((format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) ||
1627               (format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1628               !swapBytes;
1629
1630    case MESA_FORMAT_R5G6B5_UNORM:
1631       return ((format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5) ||
1632               (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1633               !swapBytes;
1634
1635    case MESA_FORMAT_B4G4R4A4_UNORM:
1636       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
1637          !swapBytes;
1638
1639    case MESA_FORMAT_A4R4G4B4_UNORM:
1640       return GL_FALSE;
1641
1642    case MESA_FORMAT_A1B5G5R5_UNORM:
1643       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1644          !swapBytes;
1645
1646    case MESA_FORMAT_B5G5R5A1_UNORM:
1647       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
1648          !swapBytes;
1649
1650    case MESA_FORMAT_A1R5G5B5_UNORM:
1651       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1652          !swapBytes;
1653
1654    case MESA_FORMAT_L4A4_UNORM:
1655       return GL_FALSE;
1656    case MESA_FORMAT_L8A8_UNORM:
1657    case MESA_FORMAT_L8A8_SRGB:
1658       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_BYTE && littleEndian;
1659    case MESA_FORMAT_A8L8_UNORM:
1660    case MESA_FORMAT_A8L8_SRGB:
1661       return GL_FALSE;
1662
1663    case MESA_FORMAT_L16A16_UNORM:
1664       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_SHORT && littleEndian && !swapBytes;
1665    case MESA_FORMAT_A16L16_UNORM:
1666       return GL_FALSE;
1667
1668    case MESA_FORMAT_B2G3R3_UNORM:
1669       return format == GL_RGB && type == GL_UNSIGNED_BYTE_3_3_2;
1670
1671    case MESA_FORMAT_R3G3B2_UNORM:
1672       return format == GL_RGB && type == GL_UNSIGNED_BYTE_2_3_3_REV;
1673
1674    case MESA_FORMAT_A4B4G4R4_UNORM:
1675       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1676          return GL_TRUE;
1677
1678       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1679          return GL_TRUE;
1680
1681       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1682          return GL_TRUE;
1683
1684       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1685          return GL_TRUE;
1686
1687       return GL_FALSE;
1688
1689    case MESA_FORMAT_R4G4B4A4_UNORM:
1690       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1691          return GL_TRUE;
1692
1693       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1694          return GL_TRUE;
1695
1696       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1697          return GL_TRUE;
1698
1699       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1700          return GL_TRUE;
1701
1702       return GL_FALSE;
1703
1704    case MESA_FORMAT_R5G5B5A1_UNORM:
1705       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
1706
1707    case MESA_FORMAT_A2B10G10R10_UNORM:
1708       return format == GL_RGBA && type == GL_UNSIGNED_INT_10_10_10_2;
1709
1710    case MESA_FORMAT_A2B10G10R10_UINT:
1711       return format == GL_RGBA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1712
1713    case MESA_FORMAT_A2R10G10B10_UNORM:
1714       return format == GL_BGRA && type == GL_UNSIGNED_INT_10_10_10_2;
1715
1716    case MESA_FORMAT_A2R10G10B10_UINT:
1717       return format == GL_BGRA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1718
1719    case MESA_FORMAT_A_UNORM8:
1720       return format == GL_ALPHA && type == GL_UNSIGNED_BYTE;
1721    case MESA_FORMAT_A_UNORM16:
1722       return format == GL_ALPHA && type == GL_UNSIGNED_SHORT && !swapBytes;
1723    case MESA_FORMAT_L_UNORM8:
1724    case MESA_FORMAT_L_SRGB8:
1725       return format == GL_LUMINANCE && type == GL_UNSIGNED_BYTE;
1726    case MESA_FORMAT_L_UNORM16:
1727       return format == GL_LUMINANCE && type == GL_UNSIGNED_SHORT && !swapBytes;
1728    case MESA_FORMAT_I_UNORM8:
1729       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1730    case MESA_FORMAT_I_UNORM16:
1731       return format == GL_RED && type == GL_UNSIGNED_SHORT && !swapBytes;
1732
1733    case MESA_FORMAT_YCBCR:
1734       return format == GL_YCBCR_MESA &&
1735              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian != swapBytes) ||
1736               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian == swapBytes));
1737    case MESA_FORMAT_YCBCR_REV:
1738       return format == GL_YCBCR_MESA &&
1739              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian == swapBytes) ||
1740               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian != swapBytes));
1741
1742    case MESA_FORMAT_R_UNORM8:
1743       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1744    case MESA_FORMAT_R8G8_UNORM:
1745       return format == GL_RG && type == GL_UNSIGNED_BYTE && littleEndian;
1746    case MESA_FORMAT_G8R8_UNORM:
1747       return GL_FALSE;
1748
1749    case MESA_FORMAT_R_UNORM16:
1750       return format == GL_RED && type == GL_UNSIGNED_SHORT &&
1751          !swapBytes;
1752    case MESA_FORMAT_R16G16_UNORM:
1753       return format == GL_RG && type == GL_UNSIGNED_SHORT && littleEndian &&
1754          !swapBytes;
1755    case MESA_FORMAT_G16R16_UNORM:
1756       return GL_FALSE;
1757
1758    case MESA_FORMAT_B10G10R10A2_UNORM:
1759       return format == GL_BGRA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1760          !swapBytes;
1761
1762    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1763       return format == GL_DEPTH_STENCIL && type == GL_UNSIGNED_INT_24_8 &&
1764          !swapBytes;
1765    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1766    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1767       return GL_FALSE;
1768
1769    case MESA_FORMAT_Z_UNORM16:
1770       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_SHORT &&
1771          !swapBytes;
1772
1773    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1774       return GL_FALSE;
1775
1776    case MESA_FORMAT_Z_UNORM32:
1777       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_INT &&
1778          !swapBytes;
1779
1780    case MESA_FORMAT_S_UINT8:
1781       return format == GL_STENCIL_INDEX && type == GL_UNSIGNED_BYTE;
1782
1783    case MESA_FORMAT_RGBA_FLOAT32:
1784       return format == GL_RGBA && type == GL_FLOAT && !swapBytes;
1785    case MESA_FORMAT_RGBA_FLOAT16:
1786       return format == GL_RGBA && type == GL_HALF_FLOAT && !swapBytes;
1787
1788    case MESA_FORMAT_RGB_FLOAT32:
1789       return format == GL_RGB && type == GL_FLOAT && !swapBytes;
1790    case MESA_FORMAT_RGB_FLOAT16:
1791       return format == GL_RGB && type == GL_HALF_FLOAT && !swapBytes;
1792
1793    case MESA_FORMAT_A_FLOAT32:
1794       return format == GL_ALPHA && type == GL_FLOAT && !swapBytes;
1795    case MESA_FORMAT_A_FLOAT16:
1796       return format == GL_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1797
1798    case MESA_FORMAT_L_FLOAT32:
1799       return format == GL_LUMINANCE && type == GL_FLOAT && !swapBytes;
1800    case MESA_FORMAT_L_FLOAT16:
1801       return format == GL_LUMINANCE && type == GL_HALF_FLOAT && !swapBytes;
1802
1803    case MESA_FORMAT_LA_FLOAT32:
1804       return format == GL_LUMINANCE_ALPHA && type == GL_FLOAT && !swapBytes;
1805    case MESA_FORMAT_LA_FLOAT16:
1806       return format == GL_LUMINANCE_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1807
1808    case MESA_FORMAT_I_FLOAT32:
1809       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1810    case MESA_FORMAT_I_FLOAT16:
1811       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1812
1813    case MESA_FORMAT_R_FLOAT32:
1814       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1815    case MESA_FORMAT_R_FLOAT16:
1816       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1817
1818    case MESA_FORMAT_RG_FLOAT32:
1819       return format == GL_RG && type == GL_FLOAT && !swapBytes;
1820    case MESA_FORMAT_RG_FLOAT16:
1821       return format == GL_RG && type == GL_HALF_FLOAT && !swapBytes;
1822
1823    case MESA_FORMAT_A_UINT8:
1824       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_BYTE;
1825    case MESA_FORMAT_A_UINT16:
1826       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_SHORT &&
1827              !swapBytes;
1828    case MESA_FORMAT_A_UINT32:
1829       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_INT &&
1830              !swapBytes;
1831    case MESA_FORMAT_A_SINT8:
1832       return format == GL_ALPHA_INTEGER && type == GL_BYTE;
1833    case MESA_FORMAT_A_SINT16:
1834       return format == GL_ALPHA_INTEGER && type == GL_SHORT && !swapBytes;
1835    case MESA_FORMAT_A_SINT32:
1836       return format == GL_ALPHA_INTEGER && type == GL_INT && !swapBytes;
1837
1838    case MESA_FORMAT_I_UINT8:
1839       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1840    case MESA_FORMAT_I_UINT16:
1841       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1842    case MESA_FORMAT_I_UINT32:
1843       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1844    case MESA_FORMAT_I_SINT8:
1845       return format == GL_RED_INTEGER && type == GL_BYTE;
1846    case MESA_FORMAT_I_SINT16:
1847       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1848    case MESA_FORMAT_I_SINT32:
1849       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1850
1851    case MESA_FORMAT_L_UINT8:
1852       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_BYTE;
1853    case MESA_FORMAT_L_UINT16:
1854       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_SHORT &&
1855              !swapBytes;
1856    case MESA_FORMAT_L_UINT32:
1857       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_INT &&
1858              !swapBytes;
1859    case MESA_FORMAT_L_SINT8:
1860       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_BYTE;
1861    case MESA_FORMAT_L_SINT16:
1862       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_SHORT &&
1863              !swapBytes;
1864    case MESA_FORMAT_L_SINT32:
1865       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_INT && !swapBytes;
1866
1867    case MESA_FORMAT_LA_UINT8:
1868       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1869              type == GL_UNSIGNED_BYTE && !swapBytes;
1870    case MESA_FORMAT_LA_UINT16:
1871       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1872              type == GL_UNSIGNED_SHORT && !swapBytes;
1873    case MESA_FORMAT_LA_UINT32:
1874       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1875              type == GL_UNSIGNED_INT && !swapBytes;
1876    case MESA_FORMAT_LA_SINT8:
1877       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_BYTE &&
1878              !swapBytes;
1879    case MESA_FORMAT_LA_SINT16:
1880       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_SHORT &&
1881              !swapBytes;
1882    case MESA_FORMAT_LA_SINT32:
1883       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_INT &&
1884              !swapBytes;
1885
1886    case MESA_FORMAT_R_SINT8:
1887       return format == GL_RED_INTEGER && type == GL_BYTE;
1888    case MESA_FORMAT_RG_SINT8:
1889       return format == GL_RG_INTEGER && type == GL_BYTE && !swapBytes;
1890    case MESA_FORMAT_RGB_SINT8:
1891       return format == GL_RGB_INTEGER && type == GL_BYTE && !swapBytes;
1892    case MESA_FORMAT_RGBA_SINT8:
1893       return format == GL_RGBA_INTEGER && type == GL_BYTE && !swapBytes;
1894    case MESA_FORMAT_R_SINT16:
1895       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1896    case MESA_FORMAT_RG_SINT16:
1897       return format == GL_RG_INTEGER && type == GL_SHORT && !swapBytes;
1898    case MESA_FORMAT_RGB_SINT16:
1899       return format == GL_RGB_INTEGER && type == GL_SHORT && !swapBytes;
1900    case MESA_FORMAT_RGBA_SINT16:
1901       return format == GL_RGBA_INTEGER && type == GL_SHORT && !swapBytes;
1902    case MESA_FORMAT_R_SINT32:
1903       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1904    case MESA_FORMAT_RG_SINT32:
1905       return format == GL_RG_INTEGER && type == GL_INT && !swapBytes;
1906    case MESA_FORMAT_RGB_SINT32:
1907       return format == GL_RGB_INTEGER && type == GL_INT && !swapBytes;
1908    case MESA_FORMAT_RGBA_SINT32:
1909       return format == GL_RGBA_INTEGER && type == GL_INT && !swapBytes;
1910
1911    case MESA_FORMAT_R_UINT8:
1912       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1913    case MESA_FORMAT_RG_UINT8:
1914       return format == GL_RG_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1915    case MESA_FORMAT_RGB_UINT8:
1916       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1917    case MESA_FORMAT_RGBA_UINT8:
1918       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_BYTE &&
1919              !swapBytes;
1920    case MESA_FORMAT_R_UINT16:
1921       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT &&
1922              !swapBytes;
1923    case MESA_FORMAT_RG_UINT16:
1924       return format == GL_RG_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1925    case MESA_FORMAT_RGB_UINT16:
1926       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT &&
1927              !swapBytes;
1928    case MESA_FORMAT_RGBA_UINT16:
1929       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT &&
1930              !swapBytes;
1931    case MESA_FORMAT_R_UINT32:
1932       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1933    case MESA_FORMAT_RG_UINT32:
1934       return format == GL_RG_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1935    case MESA_FORMAT_RGB_UINT32:
1936       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1937    case MESA_FORMAT_RGBA_UINT32:
1938       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1939
1940    case MESA_FORMAT_R_SNORM8:
1941       return format == GL_RED && type == GL_BYTE;
1942    case MESA_FORMAT_R8G8_SNORM:
1943       return format == GL_RG && type == GL_BYTE && littleEndian &&
1944              !swapBytes;
1945    case MESA_FORMAT_X8B8G8R8_SNORM:
1946       return GL_FALSE;
1947
1948    case MESA_FORMAT_A8B8G8R8_SNORM:
1949       if (format == GL_RGBA && type == GL_BYTE && !littleEndian)
1950          return GL_TRUE;
1951
1952       if (format == GL_ABGR_EXT && type == GL_BYTE && littleEndian)
1953          return GL_TRUE;
1954
1955       return GL_FALSE;
1956
1957    case MESA_FORMAT_R8G8B8A8_SNORM:
1958       if (format == GL_RGBA && type == GL_BYTE && littleEndian)
1959          return GL_TRUE;
1960
1961       if (format == GL_ABGR_EXT && type == GL_BYTE && !littleEndian)
1962          return GL_TRUE;
1963
1964       return GL_FALSE;
1965
1966    case MESA_FORMAT_R_SNORM16:
1967       return format == GL_RED && type == GL_SHORT &&
1968              !swapBytes;
1969    case MESA_FORMAT_R16G16_SNORM:
1970       return format == GL_RG && type == GL_SHORT && littleEndian && !swapBytes;
1971    case MESA_FORMAT_RGB_SNORM16:
1972       return format == GL_RGB && type == GL_SHORT && !swapBytes;
1973    case MESA_FORMAT_RGBA_SNORM16:
1974       return format == GL_RGBA && type == GL_SHORT && !swapBytes;
1975    case MESA_FORMAT_RGBA_UNORM16:
1976       return format == GL_RGBA && type == GL_UNSIGNED_SHORT &&
1977              !swapBytes;
1978
1979    case MESA_FORMAT_A_SNORM8:
1980       return format == GL_ALPHA && type == GL_BYTE;
1981    case MESA_FORMAT_L_SNORM8:
1982       return format == GL_LUMINANCE && type == GL_BYTE;
1983    case MESA_FORMAT_L8A8_SNORM:
1984       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
1985              littleEndian && !swapBytes;
1986    case MESA_FORMAT_A8L8_SNORM:
1987       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
1988              !littleEndian && !swapBytes;
1989    case MESA_FORMAT_I_SNORM8:
1990       return format == GL_RED && type == GL_BYTE;
1991    case MESA_FORMAT_A_SNORM16:
1992       return format == GL_ALPHA && type == GL_SHORT && !swapBytes;
1993    case MESA_FORMAT_L_SNORM16:
1994       return format == GL_LUMINANCE && type == GL_SHORT && !swapBytes;
1995    case MESA_FORMAT_LA_SNORM16:
1996       return format == GL_LUMINANCE_ALPHA && type == GL_SHORT &&
1997              littleEndian && !swapBytes;
1998    case MESA_FORMAT_I_SNORM16:
1999       return format == GL_RED && type == GL_SHORT && littleEndian &&
2000              !swapBytes;
2001
2002    case MESA_FORMAT_B10G10R10A2_UINT:
2003       return (format == GL_BGRA_INTEGER_EXT &&
2004               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2005               !swapBytes);
2006
2007    case MESA_FORMAT_R10G10B10A2_UINT:
2008       return (format == GL_RGBA_INTEGER_EXT &&
2009               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2010               !swapBytes);
2011
2012    case MESA_FORMAT_B5G6R5_UINT:
2013       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT_5_6_5;
2014
2015    case MESA_FORMAT_R5G6B5_UINT:
2016       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT_5_6_5_REV;
2017
2018    case MESA_FORMAT_B2G3R3_UINT:
2019       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE_3_3_2;
2020
2021    case MESA_FORMAT_R3G3B2_UINT:
2022       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE_2_3_3_REV;
2023
2024    case MESA_FORMAT_A4B4G4R4_UINT:
2025       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
2026          return GL_TRUE;
2027
2028       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
2029          return GL_TRUE;
2030       return GL_FALSE;
2031
2032    case MESA_FORMAT_R4G4B4A4_UINT:
2033       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
2034          return GL_TRUE;
2035
2036       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
2037          return GL_TRUE;
2038
2039       return GL_FALSE;
2040
2041    case MESA_FORMAT_B4G4R4A4_UINT:
2042       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
2043          !swapBytes;
2044
2045    case MESA_FORMAT_A4R4G4B4_UINT:
2046       return GL_FALSE;
2047
2048    case MESA_FORMAT_A1B5G5R5_UINT:
2049       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
2050          !swapBytes;
2051
2052    case MESA_FORMAT_B5G5R5A1_UINT:
2053       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
2054          !swapBytes;
2055
2056    case MESA_FORMAT_A1R5G5B5_UINT:
2057       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
2058          !swapBytes;
2059
2060    case MESA_FORMAT_R5G5B5A1_UINT:
2061       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
2062
2063    case MESA_FORMAT_A8B8G8R8_UINT:
2064       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
2065          return GL_TRUE;
2066
2067       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
2068          return GL_TRUE;
2069       return GL_FALSE;
2070
2071    case MESA_FORMAT_A8R8G8B8_UINT:
2072       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 &&
2073           !swapBytes)
2074          return GL_TRUE;
2075
2076       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
2077           swapBytes)
2078          return GL_TRUE;
2079
2080       return GL_FALSE;
2081
2082    case MESA_FORMAT_R8G8B8A8_UINT:
2083       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
2084           !swapBytes)
2085          return GL_TRUE;
2086
2087       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
2088          return GL_TRUE;
2089
2090       return GL_FALSE;
2091
2092    case MESA_FORMAT_B8G8R8A8_UINT:
2093       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
2094           !swapBytes)
2095          return GL_TRUE;
2096
2097       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
2098          return GL_TRUE;
2099
2100       return GL_FALSE;
2101
2102    case MESA_FORMAT_R9G9B9E5_FLOAT:
2103       return format == GL_RGB && type == GL_UNSIGNED_INT_5_9_9_9_REV &&
2104          !swapBytes;
2105
2106    case MESA_FORMAT_R11G11B10_FLOAT:
2107       return format == GL_RGB && type == GL_UNSIGNED_INT_10F_11F_11F_REV &&
2108          !swapBytes;
2109
2110    case MESA_FORMAT_Z_FLOAT32:
2111       return format == GL_DEPTH_COMPONENT && type == GL_FLOAT && !swapBytes;
2112
2113    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
2114       return format == GL_DEPTH_STENCIL &&
2115              type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV && !swapBytes;
2116
2117    case MESA_FORMAT_B4G4R4X4_UNORM:
2118    case MESA_FORMAT_B5G5R5X1_UNORM:
2119    case MESA_FORMAT_R8G8B8X8_SNORM:
2120    case MESA_FORMAT_R8G8B8X8_SRGB:
2121    case MESA_FORMAT_X8B8G8R8_SRGB:
2122    case MESA_FORMAT_RGBX_UINT8:
2123    case MESA_FORMAT_RGBX_SINT8:
2124    case MESA_FORMAT_B10G10R10X2_UNORM:
2125    case MESA_FORMAT_R10G10B10X2_UNORM:
2126    case MESA_FORMAT_RGBX_UNORM16:
2127    case MESA_FORMAT_RGBX_SNORM16:
2128    case MESA_FORMAT_RGBX_FLOAT16:
2129    case MESA_FORMAT_RGBX_UINT16:
2130    case MESA_FORMAT_RGBX_SINT16:
2131    case MESA_FORMAT_RGBX_FLOAT32:
2132    case MESA_FORMAT_RGBX_UINT32:
2133    case MESA_FORMAT_RGBX_SINT32:
2134       return GL_FALSE;
2135
2136    case MESA_FORMAT_R10G10B10A2_UNORM:
2137       return format == GL_RGBA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2138          !swapBytes;
2139
2140    case MESA_FORMAT_G8R8_SNORM:
2141       return format == GL_RG && type == GL_BYTE && !littleEndian &&
2142          !swapBytes;
2143
2144    case MESA_FORMAT_G16R16_SNORM:
2145       return format == GL_RG && type == GL_SHORT && !littleEndian &&
2146          !swapBytes;
2147
2148    case MESA_FORMAT_B8G8R8X8_SRGB:
2149    case MESA_FORMAT_X8R8G8B8_SRGB:
2150       return GL_FALSE;
2151    default:
2152       assert(_mesa_is_format_compressed(mesa_format));
2153       if (error)
2154          *error = GL_INVALID_ENUM;
2155    }
2156    return GL_FALSE;
2157 }
2158