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=1.
  72     */
  73    GLubyte BlockWidth, BlockHeight;
  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       return info->RedBits;
 136    case GL_GREEN_BITS:
 137    case GL_TEXTURE_GREEN_SIZE:
 138    case GL_RENDERBUFFER_GREEN_SIZE_EXT:
 139    case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
 140       return info->GreenBits;
 141    case GL_BLUE_BITS:
 142    case GL_TEXTURE_BLUE_SIZE:
 143    case GL_RENDERBUFFER_BLUE_SIZE_EXT:
 144    case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
 145       return info->BlueBits;
 146    case GL_ALPHA_BITS:
 147    case GL_TEXTURE_ALPHA_SIZE:
 148    case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
 149    case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
 150       return info->AlphaBits;
 151    case GL_TEXTURE_INTENSITY_SIZE:
 152       return info->IntensityBits;
 153    case GL_TEXTURE_LUMINANCE_SIZE:
 154       return info->LuminanceBits;
 155    case GL_INDEX_BITS:
 156       return 0;
 157    case GL_DEPTH_BITS:
 158    case GL_TEXTURE_DEPTH_SIZE_ARB:
 159    case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
 160    case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
 161       return info->DepthBits;
 162    case GL_STENCIL_BITS:
 163    case GL_TEXTURE_STENCIL_SIZE_EXT:
 164    case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
 165    case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
 166       return info->StencilBits;
 167    default:
 168       _mesa_problem(NULL, "bad pname in _mesa_get_format_bits()");
 169       return 0;
 170    }
 171 }
 172
 173
 174 GLuint
 175 _mesa_get_format_max_bits(mesa_format format)
 176 {
 177    const struct gl_format_info *info = _mesa_get_format_info(format);
 178    GLuint max = MAX2(info->RedBits, info->GreenBits);
 179    max = MAX2(max, info->BlueBits);
 180    max = MAX2(max, info->AlphaBits);
 181    max = MAX2(max, info->LuminanceBits);
 182    max = MAX2(max, info->IntensityBits);
 183    max = MAX2(max, info->DepthBits);
 184    max = MAX2(max, info->StencilBits);
 185    return max;
 186 }
 187
 188
 189 /**
 190  * Return the layout type of the given format.
 191  */
 192 extern enum mesa_format_layout
 193 _mesa_get_format_layout(mesa_format format)
 194 {
 195    const struct gl_format_info *info = _mesa_get_format_info(format);
 196    return info->Layout;
 197 }
 198
 199
 200 /**
 201  * Return the data type (or more specifically, the data representation)
 202  * for the given format.
 203  * The return value will be one of:
 204  *    GL_UNSIGNED_NORMALIZED = unsigned int representing [0,1]
 205  *    GL_SIGNED_NORMALIZED = signed int representing [-1, 1]
 206  *    GL_UNSIGNED_INT = an ordinary unsigned integer
 207  *    GL_INT = an ordinary signed integer
 208  *    GL_FLOAT = an ordinary float
 209  */
 210 GLenum
 211 _mesa_get_format_datatype(mesa_format format)
 212 {
 213    const struct gl_format_info *info = _mesa_get_format_info(format);
 214    return info->DataType;
 215 }
 216
 217 static GLenum
 218 get_base_format_for_array_format(mesa_array_format format)
 219 {
 220    uint8_t swizzle[4];
 221    int num_channels;
 222
 223    _mesa_array_format_get_swizzle(format, swizzle);
 224    num_channels = _mesa_array_format_get_num_channels(format);
 225
 226    switch (num_channels) {
 227    case 4:
 228       /* FIXME: RGBX formats have 4 channels, but their base format is GL_RGB.
 229        * This is not really a problem for now because we only create array
 230        * formats from GL format/type combinations, and these cannot specify
 231        * RGBX formats.
 232        */
 233       return GL_RGBA;
 234    case 3:
 235       return GL_RGB;
 236    case 2:
 237       if (swizzle[0] == 0 &&
 238           swizzle[1] == 0 &&
 239           swizzle[2] == 0 &&
 240           swizzle[3] == 1)
 241          return GL_LUMINANCE_ALPHA;
 242       if (swizzle[0] == 1 &&
 243           swizzle[1] == 1 &&
 244           swizzle[2] == 1 &&
 245           swizzle[3] == 0)
 246          return GL_LUMINANCE_ALPHA;
 247       if (swizzle[0] == 0 &&
 248           swizzle[1] == 1 &&
 249           swizzle[2] == 4 &&
 250           swizzle[3] == 5)
 251          return GL_RG;
 252       if (swizzle[0] == 1 &&
 253           swizzle[1] == 0 &&
 254           swizzle[2] == 4 &&
 255           swizzle[3] == 5)
 256          return GL_RG;
 257       break;
 258    case 1:
 259       if (swizzle[0] == 0 &&
 260           swizzle[1] == 0 &&
 261           swizzle[2] == 0 &&
 262           swizzle[3] == 5)
 263          return GL_LUMINANCE;
 264       if (swizzle[0] == 0 &&
 265           swizzle[1] == 0 &&
 266           swizzle[2] == 0 &&
 267           swizzle[3] == 0)
 268          return GL_INTENSITY;
 269       if (swizzle[0] <= MESA_FORMAT_SWIZZLE_W)
 270          return GL_RED;
 271       if (swizzle[1] <= MESA_FORMAT_SWIZZLE_W)
 272          return GL_GREEN;
 273       if (swizzle[2] <= MESA_FORMAT_SWIZZLE_W)
 274          return GL_BLUE;
 275       if (swizzle[3] <= MESA_FORMAT_SWIZZLE_W)
 276          return GL_ALPHA;
 277       break;
 278    }
 279
 280    unreachable("Unsupported format");
 281 }
 282
 283 /**
 284  * Return the basic format for the given type.  The result will be one of
 285  * GL_RGB, GL_RGBA, GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY,
 286  * GL_YCBCR_MESA, GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
 287  * This functions accepts a mesa_format or a mesa_array_format.
 288  */
 289 GLenum
 290 _mesa_get_format_base_format(uint32_t format)
 291 {
 292    if (!_mesa_format_is_mesa_array_format(format)) {
 293       const struct gl_format_info *info = _mesa_get_format_info(format);
 294       return info->BaseFormat;
 295    } else {
 296       return get_base_format_for_array_format(format);
 297    }
 298 }
 299
 300
 301 /**
 302  * Return the block size (in pixels) for the given format.  Normally
 303  * the block size is 1x1.  But compressed formats will have block sizes
 304  * of 4x4 or 8x4 pixels, etc.
 305  * \param bw  returns block width in pixels
 306  * \param bh  returns block height in pixels
 307  */
 308 void
 309 _mesa_get_format_block_size(mesa_format format, GLuint *bw, GLuint *bh)
 310 {
 311    const struct gl_format_info *info = _mesa_get_format_info(format);
 312    *bw = info->BlockWidth;
 313    *bh = info->BlockHeight;
 314 }
 315
 316
 317 /**
 318  * Returns the an array of four numbers representing the transformation
 319  * from the RGBA or SZ colorspace to the given format.  For array formats,
 320  * the i'th RGBA component is given by:
 321  *
 322  * if (swizzle[i] <= MESA_FORMAT_SWIZZLE_W)
 323  *    comp = data[swizzle[i]];
 324  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ZERO)
 325  *    comp = 0;
 326  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ONE)
 327  *    comp = 1;
 328  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_NONE)
 329  *    // data does not contain a channel of this format
 330  *
 331  * For packed formats, the swizzle gives the number of components left of
 332  * the least significant bit.
 333  *
 334  * Compressed formats have no swizzle.
 335  */
 336 void
 337 _mesa_get_format_swizzle(mesa_format format, uint8_t swizzle_out[4])
 338 {
 339    const struct gl_format_info *info = _mesa_get_format_info(format);
 340    memcpy(swizzle_out, info->Swizzle, sizeof(info->Swizzle));
 341 }
 342
 343 mesa_array_format
 344 _mesa_array_format_flip_channels(mesa_array_format format)
 345 {
 346    int num_channels;
 347    uint8_t swizzle[4];
 348
 349    num_channels = _mesa_array_format_get_num_channels(format);
 350    _mesa_array_format_get_swizzle(format, swizzle);
 351
 352    if (num_channels == 1)
 353       return format;
 354
 355    if (num_channels == 2) {
 356       /* Assert that the swizzle makes sense for 2 channels */
 357       for (unsigned i = 0; i < 4; i++)
 358          assert(swizzle[i] != 2 && swizzle[i] != 3);
 359
 360       static const uint8_t flip_xy[6] = { 1, 0, 2, 3, 4, 5 };
 361       _mesa_array_format_set_swizzle(&format,
 362                                      flip_xy[swizzle[0]], flip_xy[swizzle[1]],
 363                                      flip_xy[swizzle[2]], flip_xy[swizzle[3]]);
 364       return format;
 365    }
 366
 367    if (num_channels == 4) {
 368       static const uint8_t flip[6] = { 3, 2, 1, 0, 4, 5 };
 369       _mesa_array_format_set_swizzle(&format,
 370                                      flip[swizzle[0]], flip[swizzle[1]],
 371                                      flip[swizzle[2]], flip[swizzle[3]]);
 372       return format;
 373    }
 374
 375    unreachable("Invalid array format");
 376 }
 377
 378 uint32_t
 379 _mesa_format_to_array_format(mesa_format format)
 380 {
 381    const struct gl_format_info *info = _mesa_get_format_info(format);
 382    if (info->ArrayFormat && !_mesa_little_endian() &&
 383        info->Layout == MESA_FORMAT_LAYOUT_PACKED)
 384       return _mesa_array_format_flip_channels(info->ArrayFormat);
 385    else
 386       return info->ArrayFormat;
 387 }
 388
 389 static struct hash_table *format_array_format_table;
 390 static once_flag format_array_format_table_exists = ONCE_FLAG_INIT;
 391
 392 static bool
 393 array_formats_equal(const void *a, const void *b)
 394 {
 395    return (intptr_t)a == (intptr_t)b;
 396 }
 397
 398 static void
 399 format_array_format_table_init(void)
 400 {
 401    const struct gl_format_info *info;
 402    mesa_array_format array_format;
 403    unsigned f;
 404
 405    format_array_format_table = _mesa_hash_table_create(NULL, NULL,
 406                                                        array_formats_equal);
 407
 408    if (!format_array_format_table) {
 409       _mesa_error_no_memory(__func__);
 410       return;
 411    }
 412
 413    for (f = 1; f < MESA_FORMAT_COUNT; ++f) {
 414       info = _mesa_get_format_info(f);
 415       if (!info->ArrayFormat)
 416          continue;
 417
 418       if (_mesa_little_endian()) {
 419          array_format = info->ArrayFormat;
 420       } else {
 421          array_format = _mesa_array_format_flip_channels(info->ArrayFormat);
 422       }
 423
 424       /* This can happen and does for some of the BGR formats.  Let's take
 425        * the first one in the list.
 426        */
 427       if (_mesa_hash_table_search_pre_hashed(format_array_format_table,
 428                                              array_format,
 429                                              (void *)(intptr_t)array_format))
 430          continue;
 431
 432       _mesa_hash_table_insert_pre_hashed(format_array_format_table,
 433                                          array_format,
 434                                          (void *)(intptr_t)array_format,
 435                                          (void *)(intptr_t)f);
 436    }
 437 }
 438
 439 mesa_format
 440 _mesa_format_from_array_format(uint32_t array_format)
 441 {
 442    struct hash_entry *entry;
 443
 444    assert(_mesa_format_is_mesa_array_format(array_format));
 445
 446    call_once(&format_array_format_table_exists, format_array_format_table_init);
 447
 448    if (!format_array_format_table) {
 449       static const once_flag once_flag_init = ONCE_FLAG_INIT;
 450       format_array_format_table_exists = once_flag_init;
 451       return MESA_FORMAT_NONE;
 452    }
 453
 454    entry = _mesa_hash_table_search_pre_hashed(format_array_format_table,
 455                                               array_format,
 456                                               (void *)(intptr_t)array_format);
 457    if (entry)
 458       return (intptr_t)entry->data;
 459    else
 460       return MESA_FORMAT_NONE;
 461 }
 462
 463 /** Is the given format a compressed format? */
 464 GLboolean
 465 _mesa_is_format_compressed(mesa_format format)
 466 {
 467    const struct gl_format_info *info = _mesa_get_format_info(format);
 468    return info->BlockWidth > 1 || info->BlockHeight > 1;
 469 }
 470
 471
 472 /**
 473  * Determine if the given format represents a packed depth/stencil buffer.
 474  */
 475 GLboolean
 476 _mesa_is_format_packed_depth_stencil(mesa_format format)
 477 {
 478    const struct gl_format_info *info = _mesa_get_format_info(format);
 479
 480    return info->BaseFormat == GL_DEPTH_STENCIL;
 481 }
 482
 483
 484 /**
 485  * Is the given format a signed/unsigned integer color format?
 486  */
 487 GLboolean
 488 _mesa_is_format_integer_color(mesa_format format)
 489 {
 490    const struct gl_format_info *info = _mesa_get_format_info(format);
 491    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT) &&
 492       info->BaseFormat != GL_DEPTH_COMPONENT &&
 493       info->BaseFormat != GL_DEPTH_STENCIL &&
 494       info->BaseFormat != GL_STENCIL_INDEX;
 495 }
 496
 497
 498 /**
 499  * Is the given format an unsigned integer format?
 500  */
 501 GLboolean
 502 _mesa_is_format_unsigned(mesa_format format)
 503 {
 504    const struct gl_format_info *info = _mesa_get_format_info(format);
 505    return _mesa_is_type_unsigned(info->DataType);
 506 }
 507
 508
 509 /**
 510  * Does the given format store signed values?
 511  */
 512 GLboolean
 513 _mesa_is_format_signed(mesa_format format)
 514 {
 515    if (format == MESA_FORMAT_R11G11B10_FLOAT ||
 516        format == MESA_FORMAT_R9G9B9E5_FLOAT) {
 517       /* these packed float formats only store unsigned values */
 518       return GL_FALSE;
 519    }
 520    else {
 521       const struct gl_format_info *info = _mesa_get_format_info(format);
 522       return (info->DataType == GL_SIGNED_NORMALIZED ||
 523               info->DataType == GL_INT ||
 524               info->DataType == GL_FLOAT);
 525    }
 526 }
 527
 528 /**
 529  * Is the given format an integer format?
 530  */
 531 GLboolean
 532 _mesa_is_format_integer(mesa_format format)
 533 {
 534    const struct gl_format_info *info = _mesa_get_format_info(format);
 535    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT);
 536 }
 537
 538
 539 /**
 540  * Return true if the given format is a color format.
 541  */
 542 GLenum
 543 _mesa_is_format_color_format(mesa_format format)
 544 {
 545    const struct gl_format_info *info = _mesa_get_format_info(format);
 546    switch (info->BaseFormat) {
 547    case GL_DEPTH_COMPONENT:
 548    case GL_STENCIL_INDEX:
 549    case GL_DEPTH_STENCIL:
 550       return false;
 551    default:
 552       return true;
 553    }
 554 }
 555
 556
 557 /**
 558  * Return color encoding for given format.
 559  * \return GL_LINEAR or GL_SRGB
 560  */
 561 GLenum
 562 _mesa_get_format_color_encoding(mesa_format format)
 563 {
 564    const struct gl_format_info *info = _mesa_get_format_info(format);
 565    return info->IsSRGBFormat ? GL_SRGB : GL_LINEAR;
 566 }
 567
 568
 569 /**
 570  * Return TRUE if format is an ETC2 compressed format specified
 571  * by GL_ARB_ES3_compatibility.
 572  */
 573 bool
 574 _mesa_is_format_etc2(mesa_format format)
 575 {
 576    switch (format) {
 577    case MESA_FORMAT_ETC2_RGB8:
 578    case MESA_FORMAT_ETC2_SRGB8:
 579    case MESA_FORMAT_ETC2_RGBA8_EAC:
 580    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 581    case MESA_FORMAT_ETC2_R11_EAC:
 582    case MESA_FORMAT_ETC2_RG11_EAC:
 583    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 584    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 585    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 586    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 587       return GL_TRUE;
 588    default:
 589       return GL_FALSE;
 590    }
 591 }
 592
 593
 594 /**
 595  * For an sRGB format, return the corresponding linear color space format.
 596  * For non-sRGB formats, return the format as-is.
 597  */
 598 mesa_format
 599 _mesa_get_srgb_format_linear(mesa_format format)
 600 {
 601    switch (format) {
 602    case MESA_FORMAT_BGR_SRGB8:
 603       format = MESA_FORMAT_BGR_UNORM8;
 604       break;
 605    case MESA_FORMAT_A8B8G8R8_SRGB:
 606       format = MESA_FORMAT_A8B8G8R8_UNORM;
 607       break;
 608    case MESA_FORMAT_B8G8R8A8_SRGB:
 609       format = MESA_FORMAT_B8G8R8A8_UNORM;
 610       break;
 611    case MESA_FORMAT_A8R8G8B8_SRGB:
 612       format = MESA_FORMAT_A8R8G8B8_UNORM;
 613       break;
 614    case MESA_FORMAT_R8G8B8A8_SRGB:
 615       format = MESA_FORMAT_R8G8B8A8_UNORM;
 616       break;
 617    case MESA_FORMAT_L_SRGB8:
 618       format = MESA_FORMAT_L_UNORM8;
 619       break;
 620    case MESA_FORMAT_L8A8_SRGB:
 621       format = MESA_FORMAT_L8A8_UNORM;
 622       break;
 623    case MESA_FORMAT_A8L8_SRGB:
 624       format = MESA_FORMAT_A8L8_UNORM;
 625       break;
 626    case MESA_FORMAT_SRGB_DXT1:
 627       format = MESA_FORMAT_RGB_DXT1;
 628       break;
 629    case MESA_FORMAT_SRGBA_DXT1:
 630       format = MESA_FORMAT_RGBA_DXT1;
 631       break;
 632    case MESA_FORMAT_SRGBA_DXT3:
 633       format = MESA_FORMAT_RGBA_DXT3;
 634       break;
 635    case MESA_FORMAT_SRGBA_DXT5:
 636       format = MESA_FORMAT_RGBA_DXT5;
 637       break;
 638    case MESA_FORMAT_R8G8B8X8_SRGB:
 639       format = MESA_FORMAT_R8G8B8X8_UNORM;
 640       break;
 641    case MESA_FORMAT_X8B8G8R8_SRGB:
 642       format = MESA_FORMAT_X8B8G8R8_UNORM;
 643       break;
 644    case MESA_FORMAT_ETC2_SRGB8:
 645       format = MESA_FORMAT_ETC2_RGB8;
 646       break;
 647    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 648       format = MESA_FORMAT_ETC2_RGBA8_EAC;
 649       break;
 650    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 651       format = MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1;
 652       break;
 653    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 654       format = MESA_FORMAT_BPTC_RGBA_UNORM;
 655       break;
 656    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4:
 657       format = MESA_FORMAT_RGBA_ASTC_4x4;
 658       break;
 659    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x4:
 660       format = MESA_FORMAT_RGBA_ASTC_5x4;
 661       break;
 662    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5:
 663       format = MESA_FORMAT_RGBA_ASTC_5x5;
 664       break;
 665    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x5:
 666       format = MESA_FORMAT_RGBA_ASTC_6x5;
 667       break;
 668    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6:
 669       format = MESA_FORMAT_RGBA_ASTC_6x6;
 670       break;
 671    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x5:
 672       format = MESA_FORMAT_RGBA_ASTC_8x5;
 673       break;
 674    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x6:
 675       format = MESA_FORMAT_RGBA_ASTC_8x6;
 676       break;
 677    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x8:
 678       format = MESA_FORMAT_RGBA_ASTC_8x8;
 679       break;
 680    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x5:
 681       format = MESA_FORMAT_RGBA_ASTC_10x5;
 682       break;
 683    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x6:
 684       format = MESA_FORMAT_RGBA_ASTC_10x6;
 685       break;
 686    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x8:
 687       format = MESA_FORMAT_RGBA_ASTC_10x8;
 688       break;
 689    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x10:
 690       format = MESA_FORMAT_RGBA_ASTC_10x10;
 691       break;
 692    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x10:
 693       format = MESA_FORMAT_RGBA_ASTC_12x10;
 694       break;
 695    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x12:
 696       format = MESA_FORMAT_RGBA_ASTC_12x12;
 697       break;
 698    case MESA_FORMAT_B8G8R8X8_SRGB:
 699       format = MESA_FORMAT_B8G8R8X8_UNORM;
 700       break;
 701    case MESA_FORMAT_X8R8G8B8_SRGB:
 702       format = MESA_FORMAT_X8R8G8B8_UNORM;
 703       break;
 704    default:
 705       break;
 706    }
 707    return format;
 708 }
 709
 710
 711 /**
 712  * If the given format is a compressed format, return a corresponding
 713  * uncompressed format.
 714  */
 715 mesa_format
 716 _mesa_get_uncompressed_format(mesa_format format)
 717 {
 718    switch (format) {
 719    case MESA_FORMAT_RGB_FXT1:
 720       return MESA_FORMAT_BGR_UNORM8;
 721    case MESA_FORMAT_RGBA_FXT1:
 722       return MESA_FORMAT_A8B8G8R8_UNORM;
 723    case MESA_FORMAT_RGB_DXT1:
 724    case MESA_FORMAT_SRGB_DXT1:
 725       return MESA_FORMAT_BGR_UNORM8;
 726    case MESA_FORMAT_RGBA_DXT1:
 727    case MESA_FORMAT_SRGBA_DXT1:
 728       return MESA_FORMAT_A8B8G8R8_UNORM;
 729    case MESA_FORMAT_RGBA_DXT3:
 730    case MESA_FORMAT_SRGBA_DXT3:
 731       return MESA_FORMAT_A8B8G8R8_UNORM;
 732    case MESA_FORMAT_RGBA_DXT5:
 733    case MESA_FORMAT_SRGBA_DXT5:
 734       return MESA_FORMAT_A8B8G8R8_UNORM;
 735    case MESA_FORMAT_R_RGTC1_UNORM:
 736       return MESA_FORMAT_R_UNORM8;
 737    case MESA_FORMAT_R_RGTC1_SNORM:
 738       return MESA_FORMAT_R_SNORM8;
 739    case MESA_FORMAT_RG_RGTC2_UNORM:
 740       return MESA_FORMAT_R8G8_UNORM;
 741    case MESA_FORMAT_RG_RGTC2_SNORM:
 742       return MESA_FORMAT_R8G8_SNORM;
 743    case MESA_FORMAT_L_LATC1_UNORM:
 744       return MESA_FORMAT_L_UNORM8;
 745    case MESA_FORMAT_L_LATC1_SNORM:
 746       return MESA_FORMAT_L_SNORM8;
 747    case MESA_FORMAT_LA_LATC2_UNORM:
 748       return MESA_FORMAT_L8A8_UNORM;
 749    case MESA_FORMAT_LA_LATC2_SNORM:
 750       return MESA_FORMAT_L8A8_SNORM;
 751    case MESA_FORMAT_ETC1_RGB8:
 752    case MESA_FORMAT_ETC2_RGB8:
 753    case MESA_FORMAT_ETC2_SRGB8:
 754       return MESA_FORMAT_BGR_UNORM8;
 755    case MESA_FORMAT_ETC2_RGBA8_EAC:
 756    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 757    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 758    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 759       return MESA_FORMAT_A8B8G8R8_UNORM;
 760    case MESA_FORMAT_ETC2_R11_EAC:
 761    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 762       return MESA_FORMAT_R_UNORM16;
 763    case MESA_FORMAT_ETC2_RG11_EAC:
 764    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 765       return MESA_FORMAT_R16G16_UNORM;
 766    case MESA_FORMAT_BPTC_RGBA_UNORM:
 767    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 768       return MESA_FORMAT_A8B8G8R8_UNORM;
 769    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
 770    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
 771       return MESA_FORMAT_RGB_FLOAT32;
 772    default:
 773 #ifdef DEBUG
 774       assert(!_mesa_is_format_compressed(format));
 775 #endif
 776       return format;
 777    }
 778 }
 779
 780
 781 GLuint
 782 _mesa_format_num_components(mesa_format format)
 783 {
 784    const struct gl_format_info *info = _mesa_get_format_info(format);
 785    return ((info->RedBits > 0) +
 786            (info->GreenBits > 0) +
 787            (info->BlueBits > 0) +
 788            (info->AlphaBits > 0) +
 789            (info->LuminanceBits > 0) +
 790            (info->IntensityBits > 0) +
 791            (info->DepthBits > 0) +
 792            (info->StencilBits > 0));
 793 }
 794
 795
 796 /**
 797  * Returns true if a color format has data stored in the R/G/B/A channels,
 798  * given an index from 0 to 3.
 799  */
 800 bool
 801 _mesa_format_has_color_component(mesa_format format, int component)
 802 {
 803    const struct gl_format_info *info = _mesa_get_format_info(format);
 804
 805    assert(info->BaseFormat != GL_DEPTH_COMPONENT &&
 806           info->BaseFormat != GL_DEPTH_STENCIL &&
 807           info->BaseFormat != GL_STENCIL_INDEX);
 808
 809    switch (component) {
 810    case 0:
 811       return (info->RedBits + info->IntensityBits + info->LuminanceBits) > 0;
 812    case 1:
 813       return (info->GreenBits + info->IntensityBits + info->LuminanceBits) > 0;
 814    case 2:
 815       return (info->BlueBits + info->IntensityBits + info->LuminanceBits) > 0;
 816    case 3:
 817       return (info->AlphaBits + info->IntensityBits) > 0;
 818    default:
 819       assert(!"Invalid color component: must be 0..3");
 820       return false;
 821    }
 822 }
 823
 824
 825 /**
 826  * Return number of bytes needed to store an image of the given size
 827  * in the given format.
 828  */
 829 GLuint
 830 _mesa_format_image_size(mesa_format format, GLsizei width,
 831                         GLsizei height, GLsizei depth)
 832 {
 833    const struct gl_format_info *info = _mesa_get_format_info(format);
 834    /* Strictly speaking, a conditional isn't needed here */
 835    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 836       /* compressed format (2D only for now) */
 837       const GLuint bw = info->BlockWidth, bh = info->BlockHeight;
 838       const GLuint wblocks = (width + bw - 1) / bw;
 839       const GLuint hblocks = (height + bh - 1) / bh;
 840       const GLuint sz = wblocks * hblocks * info->BytesPerBlock;
 841       return sz * depth;
 842    }
 843    else {
 844       /* non-compressed */
 845       const GLuint sz = width * height * depth * info->BytesPerBlock;
 846       return sz;
 847    }
 848 }
 849
 850
 851 /**
 852  * Same as _mesa_format_image_size() but returns a 64-bit value to
 853  * accommodate very large textures.
 854  */
 855 uint64_t
 856 _mesa_format_image_size64(mesa_format format, GLsizei width,
 857                           GLsizei height, GLsizei depth)
 858 {
 859    const struct gl_format_info *info = _mesa_get_format_info(format);
 860    /* Strictly speaking, a conditional isn't needed here */
 861    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 862       /* compressed format (2D only for now) */
 863       const uint64_t bw = info->BlockWidth, bh = info->BlockHeight;
 864       const uint64_t wblocks = (width + bw - 1) / bw;
 865       const uint64_t hblocks = (height + bh - 1) / bh;
 866       const uint64_t sz = wblocks * hblocks * info->BytesPerBlock;
 867       return sz * depth;
 868    }
 869    else {
 870       /* non-compressed */
 871       const uint64_t sz = ((uint64_t) width *
 872                            (uint64_t) height *
 873                            (uint64_t) depth *
 874                            info->BytesPerBlock);
 875       return sz;
 876    }
 877 }
 878
 879
 880
 881 GLint
 882 _mesa_format_row_stride(mesa_format format, GLsizei width)
 883 {
 884    const struct gl_format_info *info = _mesa_get_format_info(format);
 885    /* Strictly speaking, a conditional isn't needed here */
 886    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 887       /* compressed format */
 888       const GLuint bw = info->BlockWidth;
 889       const GLuint wblocks = (width + bw - 1) / bw;
 890       const GLint stride = wblocks * info->BytesPerBlock;
 891       return stride;
 892    }
 893    else {
 894       const GLint stride = width * info->BytesPerBlock;
 895       return stride;
 896    }
 897 }
 898
 899
 900
 901 /**
 902  * Return datatype and number of components per texel for the given
 903  * uncompressed mesa_format. Only used for mipmap generation code.
 904  */
 905 void
 906 _mesa_uncompressed_format_to_type_and_comps(mesa_format format,
 907                                GLenum *datatype, GLuint *comps)
 908 {
 909    switch (format) {
 910    case MESA_FORMAT_A8B8G8R8_UNORM:
 911    case MESA_FORMAT_R8G8B8A8_UNORM:
 912    case MESA_FORMAT_B8G8R8A8_UNORM:
 913    case MESA_FORMAT_A8R8G8B8_UNORM:
 914    case MESA_FORMAT_X8B8G8R8_UNORM:
 915    case MESA_FORMAT_R8G8B8X8_UNORM:
 916    case MESA_FORMAT_B8G8R8X8_UNORM:
 917    case MESA_FORMAT_X8R8G8B8_UNORM:
 918    case MESA_FORMAT_A8B8G8R8_UINT:
 919    case MESA_FORMAT_R8G8B8A8_UINT:
 920    case MESA_FORMAT_B8G8R8A8_UINT:
 921    case MESA_FORMAT_A8R8G8B8_UINT:
 922       *datatype = GL_UNSIGNED_BYTE;
 923       *comps = 4;
 924       return;
 925    case MESA_FORMAT_BGR_UNORM8:
 926    case MESA_FORMAT_RGB_UNORM8:
 927       *datatype = GL_UNSIGNED_BYTE;
 928       *comps = 3;
 929       return;
 930    case MESA_FORMAT_B5G6R5_UNORM:
 931    case MESA_FORMAT_R5G6B5_UNORM:
 932    case MESA_FORMAT_B5G6R5_UINT:
 933    case MESA_FORMAT_R5G6B5_UINT:
 934       *datatype = GL_UNSIGNED_SHORT_5_6_5;
 935       *comps = 3;
 936       return;
 937
 938    case MESA_FORMAT_B4G4R4A4_UNORM:
 939    case MESA_FORMAT_A4R4G4B4_UNORM:
 940    case MESA_FORMAT_B4G4R4X4_UNORM:
 941    case MESA_FORMAT_B4G4R4A4_UINT:
 942    case MESA_FORMAT_A4R4G4B4_UINT:
 943       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 944       *comps = 4;
 945       return;
 946
 947    case MESA_FORMAT_B5G5R5A1_UNORM:
 948    case MESA_FORMAT_A1R5G5B5_UNORM:
 949    case MESA_FORMAT_B5G5R5X1_UNORM:
 950    case MESA_FORMAT_B5G5R5A1_UINT:
 951    case MESA_FORMAT_A1R5G5B5_UINT:
 952       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 953       *comps = 4;
 954       return;
 955
 956    case MESA_FORMAT_B10G10R10A2_UNORM:
 957       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
 958       *comps = 4;
 959       return;
 960
 961    case MESA_FORMAT_A1B5G5R5_UNORM:
 962    case MESA_FORMAT_A1B5G5R5_UINT:
 963       *datatype = GL_UNSIGNED_SHORT_5_5_5_1;
 964       *comps = 4;
 965       return;
 966
 967    case MESA_FORMAT_L4A4_UNORM:
 968       *datatype = MESA_UNSIGNED_BYTE_4_4;
 969       *comps = 2;
 970       return;
 971
 972    case MESA_FORMAT_L8A8_UNORM:
 973    case MESA_FORMAT_A8L8_UNORM:
 974    case MESA_FORMAT_R8G8_UNORM:
 975    case MESA_FORMAT_G8R8_UNORM:
 976       *datatype = GL_UNSIGNED_BYTE;
 977       *comps = 2;
 978       return;
 979
 980    case MESA_FORMAT_L16A16_UNORM:
 981    case MESA_FORMAT_A16L16_UNORM:
 982    case MESA_FORMAT_R16G16_UNORM:
 983    case MESA_FORMAT_G16R16_UNORM:
 984       *datatype = GL_UNSIGNED_SHORT;
 985       *comps = 2;
 986       return;
 987
 988    case MESA_FORMAT_R_UNORM16:
 989    case MESA_FORMAT_A_UNORM16:
 990    case MESA_FORMAT_L_UNORM16:
 991    case MESA_FORMAT_I_UNORM16:
 992       *datatype = GL_UNSIGNED_SHORT;
 993       *comps = 1;
 994       return;
 995
 996    case MESA_FORMAT_R3G3B2_UNORM:
 997    case MESA_FORMAT_R3G3B2_UINT:
 998       *datatype = GL_UNSIGNED_BYTE_2_3_3_REV;
 999       *comps = 3;
1000       return;
1001    case MESA_FORMAT_A4B4G4R4_UNORM:
1002    case MESA_FORMAT_A4B4G4R4_UINT:
1003       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
1004       *comps = 4;
1005       return;
1006
1007    case MESA_FORMAT_R4G4B4A4_UNORM:
1008    case MESA_FORMAT_R4G4B4A4_UINT:
1009       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
1010       *comps = 4;
1011       return;
1012    case MESA_FORMAT_R5G5B5A1_UNORM:
1013    case MESA_FORMAT_R5G5B5A1_UINT:
1014       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
1015       *comps = 4;
1016       return;
1017    case MESA_FORMAT_A2B10G10R10_UNORM:
1018    case MESA_FORMAT_A2B10G10R10_UINT:
1019       *datatype = GL_UNSIGNED_INT_10_10_10_2;
1020       *comps = 4;
1021       return;
1022    case MESA_FORMAT_A2R10G10B10_UNORM:
1023    case MESA_FORMAT_A2R10G10B10_UINT:
1024       *datatype = GL_UNSIGNED_INT_10_10_10_2;
1025       *comps = 4;
1026       return;
1027
1028    case MESA_FORMAT_B2G3R3_UNORM:
1029    case MESA_FORMAT_B2G3R3_UINT:
1030       *datatype = GL_UNSIGNED_BYTE_3_3_2;
1031       *comps = 3;
1032       return;
1033
1034    case MESA_FORMAT_A_UNORM8:
1035    case MESA_FORMAT_L_UNORM8:
1036    case MESA_FORMAT_I_UNORM8:
1037    case MESA_FORMAT_R_UNORM8:
1038    case MESA_FORMAT_S_UINT8:
1039       *datatype = GL_UNSIGNED_BYTE;
1040       *comps = 1;
1041       return;
1042
1043    case MESA_FORMAT_YCBCR:
1044    case MESA_FORMAT_YCBCR_REV:
1045       *datatype = GL_UNSIGNED_SHORT;
1046       *comps = 2;
1047       return;
1048
1049    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1050       *datatype = GL_UNSIGNED_INT_24_8_MESA;
1051       *comps = 2;
1052       return;
1053
1054    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1055       *datatype = GL_UNSIGNED_INT_8_24_REV_MESA;
1056       *comps = 2;
1057       return;
1058
1059    case MESA_FORMAT_Z_UNORM16:
1060       *datatype = GL_UNSIGNED_SHORT;
1061       *comps = 1;
1062       return;
1063
1064    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1065       *datatype = GL_UNSIGNED_INT;
1066       *comps = 1;
1067       return;
1068
1069    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1070       *datatype = GL_UNSIGNED_INT;
1071       *comps = 1;
1072       return;
1073
1074    case MESA_FORMAT_Z_UNORM32:
1075       *datatype = GL_UNSIGNED_INT;
1076       *comps = 1;
1077       return;
1078
1079    case MESA_FORMAT_Z_FLOAT32:
1080       *datatype = GL_FLOAT;
1081       *comps = 1;
1082       return;
1083
1084    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
1085       *datatype = GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
1086       *comps = 1;
1087       return;
1088
1089    case MESA_FORMAT_R_SNORM8:
1090    case MESA_FORMAT_A_SNORM8:
1091    case MESA_FORMAT_L_SNORM8:
1092    case MESA_FORMAT_I_SNORM8:
1093       *datatype = GL_BYTE;
1094       *comps = 1;
1095       return;
1096    case MESA_FORMAT_R8G8_SNORM:
1097    case MESA_FORMAT_L8A8_SNORM:
1098    case MESA_FORMAT_A8L8_SNORM:
1099       *datatype = GL_BYTE;
1100       *comps = 2;
1101       return;
1102    case MESA_FORMAT_A8B8G8R8_SNORM:
1103    case MESA_FORMAT_R8G8B8A8_SNORM:
1104    case MESA_FORMAT_X8B8G8R8_SNORM:
1105       *datatype = GL_BYTE;
1106       *comps = 4;
1107       return;
1108
1109    case MESA_FORMAT_RGBA_UNORM16:
1110       *datatype = GL_UNSIGNED_SHORT;
1111       *comps = 4;
1112       return;
1113
1114    case MESA_FORMAT_R_SNORM16:
1115    case MESA_FORMAT_A_SNORM16:
1116    case MESA_FORMAT_L_SNORM16:
1117    case MESA_FORMAT_I_SNORM16:
1118       *datatype = GL_SHORT;
1119       *comps = 1;
1120       return;
1121    case MESA_FORMAT_R16G16_SNORM:
1122    case MESA_FORMAT_LA_SNORM16:
1123       *datatype = GL_SHORT;
1124       *comps = 2;
1125       return;
1126    case MESA_FORMAT_RGB_SNORM16:
1127       *datatype = GL_SHORT;
1128       *comps = 3;
1129       return;
1130    case MESA_FORMAT_RGBA_SNORM16:
1131       *datatype = GL_SHORT;
1132       *comps = 4;
1133       return;
1134
1135    case MESA_FORMAT_BGR_SRGB8:
1136       *datatype = GL_UNSIGNED_BYTE;
1137       *comps = 3;
1138       return;
1139    case MESA_FORMAT_A8B8G8R8_SRGB:
1140    case MESA_FORMAT_B8G8R8A8_SRGB:
1141    case MESA_FORMAT_A8R8G8B8_SRGB:
1142    case MESA_FORMAT_R8G8B8A8_SRGB:
1143       *datatype = GL_UNSIGNED_BYTE;
1144       *comps = 4;
1145       return;
1146    case MESA_FORMAT_L_SRGB8:
1147       *datatype = GL_UNSIGNED_BYTE;
1148       *comps = 1;
1149       return;
1150    case MESA_FORMAT_L8A8_SRGB:
1151    case MESA_FORMAT_A8L8_SRGB:
1152       *datatype = GL_UNSIGNED_BYTE;
1153       *comps = 2;
1154       return;
1155
1156    case MESA_FORMAT_RGBA_FLOAT32:
1157       *datatype = GL_FLOAT;
1158       *comps = 4;
1159       return;
1160    case MESA_FORMAT_RGBA_FLOAT16:
1161       *datatype = GL_HALF_FLOAT_ARB;
1162       *comps = 4;
1163       return;
1164    case MESA_FORMAT_RGB_FLOAT32:
1165       *datatype = GL_FLOAT;
1166       *comps = 3;
1167       return;
1168    case MESA_FORMAT_RGB_FLOAT16:
1169       *datatype = GL_HALF_FLOAT_ARB;
1170       *comps = 3;
1171       return;
1172    case MESA_FORMAT_LA_FLOAT32:
1173    case MESA_FORMAT_RG_FLOAT32:
1174       *datatype = GL_FLOAT;
1175       *comps = 2;
1176       return;
1177    case MESA_FORMAT_LA_FLOAT16:
1178    case MESA_FORMAT_RG_FLOAT16:
1179       *datatype = GL_HALF_FLOAT_ARB;
1180       *comps = 2;
1181       return;
1182    case MESA_FORMAT_A_FLOAT32:
1183    case MESA_FORMAT_L_FLOAT32:
1184    case MESA_FORMAT_I_FLOAT32:
1185    case MESA_FORMAT_R_FLOAT32:
1186       *datatype = GL_FLOAT;
1187       *comps = 1;
1188       return;
1189    case MESA_FORMAT_A_FLOAT16:
1190    case MESA_FORMAT_L_FLOAT16:
1191    case MESA_FORMAT_I_FLOAT16:
1192    case MESA_FORMAT_R_FLOAT16:
1193       *datatype = GL_HALF_FLOAT_ARB;
1194       *comps = 1;
1195       return;
1196
1197    case MESA_FORMAT_A_UINT8:
1198    case MESA_FORMAT_L_UINT8:
1199    case MESA_FORMAT_I_UINT8:
1200       *datatype = GL_UNSIGNED_BYTE;
1201       *comps = 1;
1202       return;
1203    case MESA_FORMAT_LA_UINT8:
1204       *datatype = GL_UNSIGNED_BYTE;
1205       *comps = 2;
1206       return;
1207
1208    case MESA_FORMAT_A_UINT16:
1209    case MESA_FORMAT_L_UINT16:
1210    case MESA_FORMAT_I_UINT16:
1211       *datatype = GL_UNSIGNED_SHORT;
1212       *comps = 1;
1213       return;
1214    case MESA_FORMAT_LA_UINT16:
1215       *datatype = GL_UNSIGNED_SHORT;
1216       *comps = 2;
1217       return;
1218    case MESA_FORMAT_A_UINT32:
1219    case MESA_FORMAT_L_UINT32:
1220    case MESA_FORMAT_I_UINT32:
1221       *datatype = GL_UNSIGNED_INT;
1222       *comps = 1;
1223       return;
1224    case MESA_FORMAT_LA_UINT32:
1225       *datatype = GL_UNSIGNED_INT;
1226       *comps = 2;
1227       return;
1228    case MESA_FORMAT_A_SINT8:
1229    case MESA_FORMAT_L_SINT8:
1230    case MESA_FORMAT_I_SINT8:
1231       *datatype = GL_BYTE;
1232       *comps = 1;
1233       return;
1234    case MESA_FORMAT_LA_SINT8:
1235       *datatype = GL_BYTE;
1236       *comps = 2;
1237       return;
1238
1239    case MESA_FORMAT_A_SINT16:
1240    case MESA_FORMAT_L_SINT16:
1241    case MESA_FORMAT_I_SINT16:
1242       *datatype = GL_SHORT;
1243       *comps = 1;
1244       return;
1245    case MESA_FORMAT_LA_SINT16:
1246       *datatype = GL_SHORT;
1247       *comps = 2;
1248       return;
1249
1250    case MESA_FORMAT_A_SINT32:
1251    case MESA_FORMAT_L_SINT32:
1252    case MESA_FORMAT_I_SINT32:
1253       *datatype = GL_INT;
1254       *comps = 1;
1255       return;
1256    case MESA_FORMAT_LA_SINT32:
1257       *datatype = GL_INT;
1258       *comps = 2;
1259       return;
1260
1261    case MESA_FORMAT_R_SINT8:
1262       *datatype = GL_BYTE;
1263       *comps = 1;
1264       return;
1265    case MESA_FORMAT_RG_SINT8:
1266       *datatype = GL_BYTE;
1267       *comps = 2;
1268       return;
1269    case MESA_FORMAT_RGB_SINT8:
1270       *datatype = GL_BYTE;
1271       *comps = 3;
1272       return;
1273    case MESA_FORMAT_RGBA_SINT8:
1274       *datatype = GL_BYTE;
1275       *comps = 4;
1276       return;
1277    case MESA_FORMAT_R_SINT16:
1278       *datatype = GL_SHORT;
1279       *comps = 1;
1280       return;
1281    case MESA_FORMAT_RG_SINT16:
1282       *datatype = GL_SHORT;
1283       *comps = 2;
1284       return;
1285    case MESA_FORMAT_RGB_SINT16:
1286       *datatype = GL_SHORT;
1287       *comps = 3;
1288       return;
1289    case MESA_FORMAT_RGBA_SINT16:
1290       *datatype = GL_SHORT;
1291       *comps = 4;
1292       return;
1293    case MESA_FORMAT_R_SINT32:
1294       *datatype = GL_INT;
1295       *comps = 1;
1296       return;
1297    case MESA_FORMAT_RG_SINT32:
1298       *datatype = GL_INT;
1299       *comps = 2;
1300       return;
1301    case MESA_FORMAT_RGB_SINT32:
1302       *datatype = GL_INT;
1303       *comps = 3;
1304       return;
1305    case MESA_FORMAT_RGBA_SINT32:
1306       *datatype = GL_INT;
1307       *comps = 4;
1308       return;
1309
1310    /**
1311     * \name Non-normalized unsigned integer formats.
1312     */
1313    case MESA_FORMAT_R_UINT8:
1314       *datatype = GL_UNSIGNED_BYTE;
1315       *comps = 1;
1316       return;
1317    case MESA_FORMAT_RG_UINT8:
1318       *datatype = GL_UNSIGNED_BYTE;
1319       *comps = 2;
1320       return;
1321    case MESA_FORMAT_RGB_UINT8:
1322       *datatype = GL_UNSIGNED_BYTE;
1323       *comps = 3;
1324       return;
1325    case MESA_FORMAT_RGBA_UINT8:
1326       *datatype = GL_UNSIGNED_BYTE;
1327       *comps = 4;
1328       return;
1329    case MESA_FORMAT_R_UINT16:
1330       *datatype = GL_UNSIGNED_SHORT;
1331       *comps = 1;
1332       return;
1333    case MESA_FORMAT_RG_UINT16:
1334       *datatype = GL_UNSIGNED_SHORT;
1335       *comps = 2;
1336       return;
1337    case MESA_FORMAT_RGB_UINT16:
1338       *datatype = GL_UNSIGNED_SHORT;
1339       *comps = 3;
1340       return;
1341    case MESA_FORMAT_RGBA_UINT16:
1342       *datatype = GL_UNSIGNED_SHORT;
1343       *comps = 4;
1344       return;
1345    case MESA_FORMAT_R_UINT32:
1346       *datatype = GL_UNSIGNED_INT;
1347       *comps = 1;
1348       return;
1349    case MESA_FORMAT_RG_UINT32:
1350       *datatype = GL_UNSIGNED_INT;
1351       *comps = 2;
1352       return;
1353    case MESA_FORMAT_RGB_UINT32:
1354       *datatype = GL_UNSIGNED_INT;
1355       *comps = 3;
1356       return;
1357    case MESA_FORMAT_RGBA_UINT32:
1358       *datatype = GL_UNSIGNED_INT;
1359       *comps = 4;
1360       return;
1361
1362    case MESA_FORMAT_R9G9B9E5_FLOAT:
1363       *datatype = GL_UNSIGNED_INT_5_9_9_9_REV;
1364       *comps = 3;
1365       return;
1366
1367    case MESA_FORMAT_R11G11B10_FLOAT:
1368       *datatype = GL_UNSIGNED_INT_10F_11F_11F_REV;
1369       *comps = 3;
1370       return;
1371
1372    case MESA_FORMAT_B10G10R10A2_UINT:
1373    case MESA_FORMAT_R10G10B10A2_UINT:
1374       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1375       *comps = 4;
1376       return;
1377
1378    case MESA_FORMAT_R8G8B8X8_SRGB:
1379    case MESA_FORMAT_X8B8G8R8_SRGB:
1380    case MESA_FORMAT_RGBX_UINT8:
1381       *datatype = GL_UNSIGNED_BYTE;
1382       *comps = 4;
1383       return;
1384
1385    case MESA_FORMAT_R8G8B8X8_SNORM:
1386    case MESA_FORMAT_RGBX_SINT8:
1387       *datatype = GL_BYTE;
1388       *comps = 4;
1389       return;
1390
1391    case MESA_FORMAT_B10G10R10X2_UNORM:
1392    case MESA_FORMAT_R10G10B10X2_UNORM:
1393       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1394       *comps = 4;
1395       return;
1396
1397    case MESA_FORMAT_RGBX_UNORM16:
1398    case MESA_FORMAT_RGBX_UINT16:
1399       *datatype = GL_UNSIGNED_SHORT;
1400       *comps = 4;
1401       return;
1402
1403    case MESA_FORMAT_RGBX_SNORM16:
1404    case MESA_FORMAT_RGBX_SINT16:
1405       *datatype = GL_SHORT;
1406       *comps = 4;
1407       return;
1408
1409    case MESA_FORMAT_RGBX_FLOAT16:
1410       *datatype = GL_HALF_FLOAT;
1411       *comps = 4;
1412       return;
1413
1414    case MESA_FORMAT_RGBX_FLOAT32:
1415       *datatype = GL_FLOAT;
1416       *comps = 4;
1417       return;
1418
1419    case MESA_FORMAT_RGBX_UINT32:
1420       *datatype = GL_UNSIGNED_INT;
1421       *comps = 4;
1422       return;
1423
1424    case MESA_FORMAT_RGBX_SINT32:
1425       *datatype = GL_INT;
1426       *comps = 4;
1427       return;
1428
1429    case MESA_FORMAT_R10G10B10A2_UNORM:
1430       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1431       *comps = 4;
1432       return;
1433
1434    case MESA_FORMAT_G8R8_SNORM:
1435       *datatype = GL_BYTE;
1436       *comps = 2;
1437       return;
1438
1439    case MESA_FORMAT_G16R16_SNORM:
1440       *datatype = GL_SHORT;
1441       *comps = 2;
1442       return;
1443
1444    case MESA_FORMAT_B8G8R8X8_SRGB:
1445    case MESA_FORMAT_X8R8G8B8_SRGB:
1446       *datatype = GL_UNSIGNED_BYTE;
1447       *comps = 4;
1448       return;
1449
1450    case MESA_FORMAT_COUNT:
1451       assert(0);
1452       return;
1453    default:
1454       /* Warn if any formats are not handled */
1455       _mesa_problem(NULL, "bad format %s in _mesa_uncompressed_format_to_type_and_comps",
1456                     _mesa_get_format_name(format));
1457       assert(format == MESA_FORMAT_NONE ||
1458              _mesa_is_format_compressed(format));
1459       *datatype = 0;
1460       *comps = 1;
1461    }
1462 }
1463
1464 /**
1465  * Check if a mesa_format exactly matches a GL format/type combination
1466  * such that we can use memcpy() from one to the other.
1467  * \param mesa_format  a MESA_FORMAT_x value
1468  * \param format  the user-specified image format
1469  * \param type  the user-specified image datatype
1470  * \param swapBytes  typically the current pixel pack/unpack byteswap state
1471  * \param[out] error GL_NO_ERROR if format is an expected input.
1472  *                   GL_INVALID_ENUM if format is an unexpected input.
1473  * \return GL_TRUE if the formats match, GL_FALSE otherwise.
1474  */
1475 GLboolean
1476 _mesa_format_matches_format_and_type(mesa_format mesa_format,
1477                                      GLenum format, GLenum type,
1478                                      GLboolean swapBytes, GLenum *error)
1479 {
1480    const GLboolean littleEndian = _mesa_little_endian();
1481    if (error)
1482       *error = GL_NO_ERROR;
1483
1484    /* Note: When reading a GL format/type combination, the format lists channel
1485     * assignments from most significant channel in the type to least
1486     * significant.  A type with _REV indicates that the assignments are
1487     * swapped, so they are listed from least significant to most significant.
1488     *
1489     * Compressed formats will fall through and return GL_FALSE.
1490     *
1491     * For sanity, please keep this switch statement ordered the same as the
1492     * enums in formats.h.
1493     */
1494
1495    switch (mesa_format) {
1496
1497    case MESA_FORMAT_NONE:
1498    case MESA_FORMAT_COUNT:
1499       return GL_FALSE;
1500
1501    case MESA_FORMAT_A8B8G8R8_UNORM:
1502    case MESA_FORMAT_A8B8G8R8_SRGB:
1503       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1504          return GL_TRUE;
1505
1506       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
1507          return GL_TRUE;
1508
1509       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && !littleEndian)
1510          return GL_TRUE;
1511
1512       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV
1513           && !swapBytes)
1514          return GL_TRUE;
1515
1516       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8
1517           && swapBytes)
1518          return GL_TRUE;
1519
1520       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && littleEndian)
1521          return GL_TRUE;
1522
1523       return GL_FALSE;
1524
1525    case MESA_FORMAT_R8G8B8A8_UNORM:
1526    case MESA_FORMAT_R8G8B8A8_SRGB:
1527       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1528           !swapBytes)
1529          return GL_TRUE;
1530
1531       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1532          return GL_TRUE;
1533
1534       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && littleEndian)
1535          return GL_TRUE;
1536
1537       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8 &&
1538           !swapBytes)
1539          return GL_TRUE;
1540
1541       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1542           swapBytes)
1543          return GL_TRUE;
1544
1545       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && !littleEndian)
1546          return GL_TRUE;
1547
1548       return GL_FALSE;
1549
1550    case MESA_FORMAT_B8G8R8A8_UNORM:
1551    case MESA_FORMAT_B8G8R8A8_SRGB:
1552       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1553           !swapBytes)
1554          return GL_TRUE;
1555
1556       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1557          return GL_TRUE;
1558
1559       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && littleEndian)
1560          return GL_TRUE;
1561
1562       return GL_FALSE;
1563
1564    case MESA_FORMAT_A8R8G8B8_UNORM:
1565    case MESA_FORMAT_A8R8G8B8_SRGB:
1566       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1567          return GL_TRUE;
1568
1569       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1570           swapBytes)
1571          return GL_TRUE;
1572
1573       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && !littleEndian)
1574          return GL_TRUE;
1575
1576       return GL_FALSE;
1577
1578    case MESA_FORMAT_X8B8G8R8_UNORM:
1579    case MESA_FORMAT_R8G8B8X8_UNORM:
1580       return GL_FALSE;
1581
1582    case MESA_FORMAT_B8G8R8X8_UNORM:
1583    case MESA_FORMAT_X8R8G8B8_UNORM:
1584       return GL_FALSE;
1585
1586    case MESA_FORMAT_BGR_UNORM8:
1587    case MESA_FORMAT_BGR_SRGB8:
1588       return format == GL_BGR && type == GL_UNSIGNED_BYTE && littleEndian;
1589
1590    case MESA_FORMAT_RGB_UNORM8:
1591       return format == GL_RGB && type == GL_UNSIGNED_BYTE && littleEndian;
1592
1593    case MESA_FORMAT_B5G6R5_UNORM:
1594       return ((format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) ||
1595               (format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1596               !swapBytes;
1597
1598    case MESA_FORMAT_R5G6B5_UNORM:
1599       return ((format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5) ||
1600               (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1601               !swapBytes;
1602
1603    case MESA_FORMAT_B4G4R4A4_UNORM:
1604       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
1605          !swapBytes;
1606
1607    case MESA_FORMAT_A4R4G4B4_UNORM:
1608       return GL_FALSE;
1609
1610    case MESA_FORMAT_A1B5G5R5_UNORM:
1611       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1612          !swapBytes;
1613
1614    case MESA_FORMAT_B5G5R5A1_UNORM:
1615       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
1616          !swapBytes;
1617
1618    case MESA_FORMAT_A1R5G5B5_UNORM:
1619       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1620          !swapBytes;
1621
1622    case MESA_FORMAT_L4A4_UNORM:
1623       return GL_FALSE;
1624    case MESA_FORMAT_L8A8_UNORM:
1625    case MESA_FORMAT_L8A8_SRGB:
1626       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_BYTE && littleEndian;
1627    case MESA_FORMAT_A8L8_UNORM:
1628    case MESA_FORMAT_A8L8_SRGB:
1629       return GL_FALSE;
1630
1631    case MESA_FORMAT_L16A16_UNORM:
1632       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_SHORT && littleEndian && !swapBytes;
1633    case MESA_FORMAT_A16L16_UNORM:
1634       return GL_FALSE;
1635
1636    case MESA_FORMAT_B2G3R3_UNORM:
1637       return format == GL_RGB && type == GL_UNSIGNED_BYTE_3_3_2;
1638
1639    case MESA_FORMAT_R3G3B2_UNORM:
1640       return format == GL_RGB && type == GL_UNSIGNED_BYTE_2_3_3_REV;
1641
1642    case MESA_FORMAT_A4B4G4R4_UNORM:
1643       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1644          return GL_TRUE;
1645
1646       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1647          return GL_TRUE;
1648
1649       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1650          return GL_TRUE;
1651
1652       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1653          return GL_TRUE;
1654
1655       return GL_FALSE;
1656
1657    case MESA_FORMAT_R4G4B4A4_UNORM:
1658       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1659          return GL_TRUE;
1660
1661       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1662          return GL_TRUE;
1663
1664       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1665          return GL_TRUE;
1666
1667       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1668          return GL_TRUE;
1669
1670       return GL_FALSE;
1671
1672    case MESA_FORMAT_R5G5B5A1_UNORM:
1673       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
1674
1675    case MESA_FORMAT_A2B10G10R10_UNORM:
1676       return format == GL_RGBA && type == GL_UNSIGNED_INT_10_10_10_2;
1677
1678    case MESA_FORMAT_A2B10G10R10_UINT:
1679       return format == GL_RGBA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1680
1681    case MESA_FORMAT_A2R10G10B10_UNORM:
1682       return format == GL_BGRA && type == GL_UNSIGNED_INT_10_10_10_2;
1683
1684    case MESA_FORMAT_A2R10G10B10_UINT:
1685       return format == GL_BGRA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1686
1687    case MESA_FORMAT_A_UNORM8:
1688       return format == GL_ALPHA && type == GL_UNSIGNED_BYTE;
1689    case MESA_FORMAT_A_UNORM16:
1690       return format == GL_ALPHA && type == GL_UNSIGNED_SHORT && !swapBytes;
1691    case MESA_FORMAT_L_UNORM8:
1692    case MESA_FORMAT_L_SRGB8:
1693       return format == GL_LUMINANCE && type == GL_UNSIGNED_BYTE;
1694    case MESA_FORMAT_L_UNORM16:
1695       return format == GL_LUMINANCE && type == GL_UNSIGNED_SHORT && !swapBytes;
1696    case MESA_FORMAT_I_UNORM8:
1697       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1698    case MESA_FORMAT_I_UNORM16:
1699       return format == GL_RED && type == GL_UNSIGNED_SHORT && !swapBytes;
1700
1701    case MESA_FORMAT_YCBCR:
1702       return format == GL_YCBCR_MESA &&
1703              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian != swapBytes) ||
1704               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian == swapBytes));
1705    case MESA_FORMAT_YCBCR_REV:
1706       return format == GL_YCBCR_MESA &&
1707              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian == swapBytes) ||
1708               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian != swapBytes));
1709
1710    case MESA_FORMAT_R_UNORM8:
1711       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1712    case MESA_FORMAT_R8G8_UNORM:
1713       return format == GL_RG && type == GL_UNSIGNED_BYTE && littleEndian;
1714    case MESA_FORMAT_G8R8_UNORM:
1715       return GL_FALSE;
1716
1717    case MESA_FORMAT_R_UNORM16:
1718       return format == GL_RED && type == GL_UNSIGNED_SHORT &&
1719          !swapBytes;
1720    case MESA_FORMAT_R16G16_UNORM:
1721       return format == GL_RG && type == GL_UNSIGNED_SHORT && littleEndian &&
1722          !swapBytes;
1723    case MESA_FORMAT_G16R16_UNORM:
1724       return GL_FALSE;
1725
1726    case MESA_FORMAT_B10G10R10A2_UNORM:
1727       return format == GL_BGRA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1728          !swapBytes;
1729
1730    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1731       return format == GL_DEPTH_STENCIL && type == GL_UNSIGNED_INT_24_8 &&
1732          !swapBytes;
1733    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1734    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1735       return GL_FALSE;
1736
1737    case MESA_FORMAT_Z_UNORM16:
1738       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_SHORT &&
1739          !swapBytes;
1740
1741    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1742       return GL_FALSE;
1743
1744    case MESA_FORMAT_Z_UNORM32:
1745       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_INT &&
1746          !swapBytes;
1747
1748    case MESA_FORMAT_S_UINT8:
1749       return format == GL_STENCIL_INDEX && type == GL_UNSIGNED_BYTE;
1750
1751    case MESA_FORMAT_RGBA_FLOAT32:
1752       return format == GL_RGBA && type == GL_FLOAT && !swapBytes;
1753    case MESA_FORMAT_RGBA_FLOAT16:
1754       return format == GL_RGBA && type == GL_HALF_FLOAT && !swapBytes;
1755
1756    case MESA_FORMAT_RGB_FLOAT32:
1757       return format == GL_RGB && type == GL_FLOAT && !swapBytes;
1758    case MESA_FORMAT_RGB_FLOAT16:
1759       return format == GL_RGB && type == GL_HALF_FLOAT && !swapBytes;
1760
1761    case MESA_FORMAT_A_FLOAT32:
1762       return format == GL_ALPHA && type == GL_FLOAT && !swapBytes;
1763    case MESA_FORMAT_A_FLOAT16:
1764       return format == GL_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1765
1766    case MESA_FORMAT_L_FLOAT32:
1767       return format == GL_LUMINANCE && type == GL_FLOAT && !swapBytes;
1768    case MESA_FORMAT_L_FLOAT16:
1769       return format == GL_LUMINANCE && type == GL_HALF_FLOAT && !swapBytes;
1770
1771    case MESA_FORMAT_LA_FLOAT32:
1772       return format == GL_LUMINANCE_ALPHA && type == GL_FLOAT && !swapBytes;
1773    case MESA_FORMAT_LA_FLOAT16:
1774       return format == GL_LUMINANCE_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1775
1776    case MESA_FORMAT_I_FLOAT32:
1777       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1778    case MESA_FORMAT_I_FLOAT16:
1779       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1780
1781    case MESA_FORMAT_R_FLOAT32:
1782       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1783    case MESA_FORMAT_R_FLOAT16:
1784       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1785
1786    case MESA_FORMAT_RG_FLOAT32:
1787       return format == GL_RG && type == GL_FLOAT && !swapBytes;
1788    case MESA_FORMAT_RG_FLOAT16:
1789       return format == GL_RG && type == GL_HALF_FLOAT && !swapBytes;
1790
1791    case MESA_FORMAT_A_UINT8:
1792       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_BYTE;
1793    case MESA_FORMAT_A_UINT16:
1794       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_SHORT &&
1795              !swapBytes;
1796    case MESA_FORMAT_A_UINT32:
1797       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_INT &&
1798              !swapBytes;
1799    case MESA_FORMAT_A_SINT8:
1800       return format == GL_ALPHA_INTEGER && type == GL_BYTE;
1801    case MESA_FORMAT_A_SINT16:
1802       return format == GL_ALPHA_INTEGER && type == GL_SHORT && !swapBytes;
1803    case MESA_FORMAT_A_SINT32:
1804       return format == GL_ALPHA_INTEGER && type == GL_INT && !swapBytes;
1805
1806    case MESA_FORMAT_I_UINT8:
1807       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1808    case MESA_FORMAT_I_UINT16:
1809       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1810    case MESA_FORMAT_I_UINT32:
1811       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1812    case MESA_FORMAT_I_SINT8:
1813       return format == GL_RED_INTEGER && type == GL_BYTE;
1814    case MESA_FORMAT_I_SINT16:
1815       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1816    case MESA_FORMAT_I_SINT32:
1817       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1818
1819    case MESA_FORMAT_L_UINT8:
1820       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_BYTE;
1821    case MESA_FORMAT_L_UINT16:
1822       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_SHORT &&
1823              !swapBytes;
1824    case MESA_FORMAT_L_UINT32:
1825       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_INT &&
1826              !swapBytes;
1827    case MESA_FORMAT_L_SINT8:
1828       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_BYTE;
1829    case MESA_FORMAT_L_SINT16:
1830       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_SHORT &&
1831              !swapBytes;
1832    case MESA_FORMAT_L_SINT32:
1833       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_INT && !swapBytes;
1834
1835    case MESA_FORMAT_LA_UINT8:
1836       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1837              type == GL_UNSIGNED_BYTE && !swapBytes;
1838    case MESA_FORMAT_LA_UINT16:
1839       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1840              type == GL_UNSIGNED_SHORT && !swapBytes;
1841    case MESA_FORMAT_LA_UINT32:
1842       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1843              type == GL_UNSIGNED_INT && !swapBytes;
1844    case MESA_FORMAT_LA_SINT8:
1845       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_BYTE &&
1846              !swapBytes;
1847    case MESA_FORMAT_LA_SINT16:
1848       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_SHORT &&
1849              !swapBytes;
1850    case MESA_FORMAT_LA_SINT32:
1851       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_INT &&
1852              !swapBytes;
1853
1854    case MESA_FORMAT_R_SINT8:
1855       return format == GL_RED_INTEGER && type == GL_BYTE;
1856    case MESA_FORMAT_RG_SINT8:
1857       return format == GL_RG_INTEGER && type == GL_BYTE && !swapBytes;
1858    case MESA_FORMAT_RGB_SINT8:
1859       return format == GL_RGB_INTEGER && type == GL_BYTE && !swapBytes;
1860    case MESA_FORMAT_RGBA_SINT8:
1861       return format == GL_RGBA_INTEGER && type == GL_BYTE && !swapBytes;
1862    case MESA_FORMAT_R_SINT16:
1863       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1864    case MESA_FORMAT_RG_SINT16:
1865       return format == GL_RG_INTEGER && type == GL_SHORT && !swapBytes;
1866    case MESA_FORMAT_RGB_SINT16:
1867       return format == GL_RGB_INTEGER && type == GL_SHORT && !swapBytes;
1868    case MESA_FORMAT_RGBA_SINT16:
1869       return format == GL_RGBA_INTEGER && type == GL_SHORT && !swapBytes;
1870    case MESA_FORMAT_R_SINT32:
1871       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1872    case MESA_FORMAT_RG_SINT32:
1873       return format == GL_RG_INTEGER && type == GL_INT && !swapBytes;
1874    case MESA_FORMAT_RGB_SINT32:
1875       return format == GL_RGB_INTEGER && type == GL_INT && !swapBytes;
1876    case MESA_FORMAT_RGBA_SINT32:
1877       return format == GL_RGBA_INTEGER && type == GL_INT && !swapBytes;
1878
1879    case MESA_FORMAT_R_UINT8:
1880       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1881    case MESA_FORMAT_RG_UINT8:
1882       return format == GL_RG_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1883    case MESA_FORMAT_RGB_UINT8:
1884       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1885    case MESA_FORMAT_RGBA_UINT8:
1886       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_BYTE &&
1887              !swapBytes;
1888    case MESA_FORMAT_R_UINT16:
1889       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT &&
1890              !swapBytes;
1891    case MESA_FORMAT_RG_UINT16:
1892       return format == GL_RG_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1893    case MESA_FORMAT_RGB_UINT16:
1894       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT &&
1895              !swapBytes;
1896    case MESA_FORMAT_RGBA_UINT16:
1897       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT &&
1898              !swapBytes;
1899    case MESA_FORMAT_R_UINT32:
1900       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1901    case MESA_FORMAT_RG_UINT32:
1902       return format == GL_RG_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1903    case MESA_FORMAT_RGB_UINT32:
1904       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1905    case MESA_FORMAT_RGBA_UINT32:
1906       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1907
1908    case MESA_FORMAT_R_SNORM8:
1909       return format == GL_RED && type == GL_BYTE;
1910    case MESA_FORMAT_R8G8_SNORM:
1911       return format == GL_RG && type == GL_BYTE && littleEndian &&
1912              !swapBytes;
1913    case MESA_FORMAT_X8B8G8R8_SNORM:
1914       return GL_FALSE;
1915
1916    case MESA_FORMAT_A8B8G8R8_SNORM:
1917       if (format == GL_RGBA && type == GL_BYTE && !littleEndian)
1918          return GL_TRUE;
1919
1920       if (format == GL_ABGR_EXT && type == GL_BYTE && littleEndian)
1921          return GL_TRUE;
1922
1923       return GL_FALSE;
1924
1925    case MESA_FORMAT_R8G8B8A8_SNORM:
1926       if (format == GL_RGBA && type == GL_BYTE && littleEndian)
1927          return GL_TRUE;
1928
1929       if (format == GL_ABGR_EXT && type == GL_BYTE && !littleEndian)
1930          return GL_TRUE;
1931
1932       return GL_FALSE;
1933
1934    case MESA_FORMAT_R_SNORM16:
1935       return format == GL_RED && type == GL_SHORT &&
1936              !swapBytes;
1937    case MESA_FORMAT_R16G16_SNORM:
1938       return format == GL_RG && type == GL_SHORT && littleEndian && !swapBytes;
1939    case MESA_FORMAT_RGB_SNORM16:
1940       return format == GL_RGB && type == GL_SHORT && !swapBytes;
1941    case MESA_FORMAT_RGBA_SNORM16:
1942       return format == GL_RGBA && type == GL_SHORT && !swapBytes;
1943    case MESA_FORMAT_RGBA_UNORM16:
1944       return format == GL_RGBA && type == GL_UNSIGNED_SHORT &&
1945              !swapBytes;
1946
1947    case MESA_FORMAT_A_SNORM8:
1948       return format == GL_ALPHA && type == GL_BYTE;
1949    case MESA_FORMAT_L_SNORM8:
1950       return format == GL_LUMINANCE && type == GL_BYTE;
1951    case MESA_FORMAT_L8A8_SNORM:
1952       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
1953              littleEndian && !swapBytes;
1954    case MESA_FORMAT_A8L8_SNORM:
1955       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
1956              !littleEndian && !swapBytes;
1957    case MESA_FORMAT_I_SNORM8:
1958       return format == GL_RED && type == GL_BYTE;
1959    case MESA_FORMAT_A_SNORM16:
1960       return format == GL_ALPHA && type == GL_SHORT && !swapBytes;
1961    case MESA_FORMAT_L_SNORM16:
1962       return format == GL_LUMINANCE && type == GL_SHORT && !swapBytes;
1963    case MESA_FORMAT_LA_SNORM16:
1964       return format == GL_LUMINANCE_ALPHA && type == GL_SHORT &&
1965              littleEndian && !swapBytes;
1966    case MESA_FORMAT_I_SNORM16:
1967       return format == GL_RED && type == GL_SHORT && littleEndian &&
1968              !swapBytes;
1969
1970    case MESA_FORMAT_B10G10R10A2_UINT:
1971       return (format == GL_BGRA_INTEGER_EXT &&
1972               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1973               !swapBytes);
1974
1975    case MESA_FORMAT_R10G10B10A2_UINT:
1976       return (format == GL_RGBA_INTEGER_EXT &&
1977               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1978               !swapBytes);
1979
1980    case MESA_FORMAT_B5G6R5_UINT:
1981       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT_5_6_5;
1982
1983    case MESA_FORMAT_R5G6B5_UINT:
1984       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT_5_6_5_REV;
1985
1986    case MESA_FORMAT_B2G3R3_UINT:
1987       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE_3_3_2;
1988
1989    case MESA_FORMAT_R3G3B2_UINT:
1990       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE_2_3_3_REV;
1991
1992    case MESA_FORMAT_A4B4G4R4_UINT:
1993       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1994          return GL_TRUE;
1995
1996       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1997          return GL_TRUE;
1998       return GL_FALSE;
1999
2000    case MESA_FORMAT_R4G4B4A4_UINT:
2001       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
2002          return GL_TRUE;
2003
2004       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
2005          return GL_TRUE;
2006
2007       return GL_FALSE;
2008
2009    case MESA_FORMAT_B4G4R4A4_UINT:
2010       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
2011          !swapBytes;
2012
2013    case MESA_FORMAT_A4R4G4B4_UINT:
2014       return GL_FALSE;
2015
2016    case MESA_FORMAT_A1B5G5R5_UINT:
2017       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
2018          !swapBytes;
2019
2020    case MESA_FORMAT_B5G5R5A1_UINT:
2021       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
2022          !swapBytes;
2023
2024    case MESA_FORMAT_A1R5G5B5_UINT:
2025       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
2026          !swapBytes;
2027
2028    case MESA_FORMAT_R5G5B5A1_UINT:
2029       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
2030
2031    case MESA_FORMAT_A8B8G8R8_UINT:
2032       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
2033          return GL_TRUE;
2034
2035       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
2036          return GL_TRUE;
2037       return GL_FALSE;
2038
2039    case MESA_FORMAT_A8R8G8B8_UINT:
2040       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 &&
2041           !swapBytes)
2042          return GL_TRUE;
2043
2044       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
2045           swapBytes)
2046          return GL_TRUE;
2047
2048       return GL_FALSE;
2049
2050    case MESA_FORMAT_R8G8B8A8_UINT:
2051       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
2052           !swapBytes)
2053          return GL_TRUE;
2054
2055       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
2056          return GL_TRUE;
2057
2058       return GL_FALSE;
2059
2060    case MESA_FORMAT_B8G8R8A8_UINT:
2061       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
2062           !swapBytes)
2063          return GL_TRUE;
2064
2065       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
2066          return GL_TRUE;
2067
2068       return GL_FALSE;
2069
2070    case MESA_FORMAT_R9G9B9E5_FLOAT:
2071       return format == GL_RGB && type == GL_UNSIGNED_INT_5_9_9_9_REV &&
2072          !swapBytes;
2073
2074    case MESA_FORMAT_R11G11B10_FLOAT:
2075       return format == GL_RGB && type == GL_UNSIGNED_INT_10F_11F_11F_REV &&
2076          !swapBytes;
2077
2078    case MESA_FORMAT_Z_FLOAT32:
2079       return format == GL_DEPTH_COMPONENT && type == GL_FLOAT && !swapBytes;
2080
2081    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
2082       return format == GL_DEPTH_STENCIL &&
2083              type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV && !swapBytes;
2084
2085    case MESA_FORMAT_B4G4R4X4_UNORM:
2086    case MESA_FORMAT_B5G5R5X1_UNORM:
2087    case MESA_FORMAT_R8G8B8X8_SNORM:
2088    case MESA_FORMAT_R8G8B8X8_SRGB:
2089    case MESA_FORMAT_X8B8G8R8_SRGB:
2090    case MESA_FORMAT_RGBX_UINT8:
2091    case MESA_FORMAT_RGBX_SINT8:
2092    case MESA_FORMAT_B10G10R10X2_UNORM:
2093    case MESA_FORMAT_R10G10B10X2_UNORM:
2094    case MESA_FORMAT_RGBX_UNORM16:
2095    case MESA_FORMAT_RGBX_SNORM16:
2096    case MESA_FORMAT_RGBX_FLOAT16:
2097    case MESA_FORMAT_RGBX_UINT16:
2098    case MESA_FORMAT_RGBX_SINT16:
2099    case MESA_FORMAT_RGBX_FLOAT32:
2100    case MESA_FORMAT_RGBX_UINT32:
2101    case MESA_FORMAT_RGBX_SINT32:
2102       return GL_FALSE;
2103
2104    case MESA_FORMAT_R10G10B10A2_UNORM:
2105       return format == GL_RGBA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2106          !swapBytes;
2107
2108    case MESA_FORMAT_G8R8_SNORM:
2109       return format == GL_RG && type == GL_BYTE && !littleEndian &&
2110          !swapBytes;
2111
2112    case MESA_FORMAT_G16R16_SNORM:
2113       return format == GL_RG && type == GL_SHORT && !littleEndian &&
2114          !swapBytes;
2115
2116    case MESA_FORMAT_B8G8R8X8_SRGB:
2117    case MESA_FORMAT_X8R8G8B8_SRGB:
2118       return GL_FALSE;
2119    default:
2120       assert(_mesa_is_format_compressed(mesa_format));
2121       if (error)
2122          *error = GL_INVALID_ENUM;
2123    }
2124    return GL_FALSE;
2125 }
2126