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    /**
  69     * To describe compressed formats.  If not compressed, Width=Height=1.
  70     */
  71    GLubyte BlockWidth, BlockHeight;
  72    GLubyte BytesPerBlock;
  73
  74    uint8_t Swizzle[4];
  75    mesa_array_format ArrayFormat;
  76 };
  77
  78 #include "format_info.h"
  79
  80 static const struct gl_format_info *
  81 _mesa_get_format_info(mesa_format format)
  82 {
  83    const struct gl_format_info *info = &format_info[format];
  84    assert(info->Name == format);
  85    return info;
  86 }
  87
  88
  89 /** Return string name of format (for debugging) */
  90 const char *
  91 _mesa_get_format_name(mesa_format format)
  92 {
  93    const struct gl_format_info *info = _mesa_get_format_info(format);
  94    return info->StrName;
  95 }
  96
  97
  98
  99 /**
 100  * Return bytes needed to store a block of pixels in the given format.
 101  * Normally, a block is 1x1 (a single pixel).  But for compressed formats
 102  * a block may be 4x4 or 8x4, etc.
 103  *
 104  * Note: not GLuint, so as not to coerce math to unsigned. cf. fdo #37351
 105  */
 106 GLint
 107 _mesa_get_format_bytes(mesa_format format)
 108 {
 109    const struct gl_format_info *info = _mesa_get_format_info(format);
 110    assert(info->BytesPerBlock);
 111    assert(info->BytesPerBlock <= MAX_PIXEL_BYTES ||
 112           _mesa_is_format_compressed(format));
 113    return info->BytesPerBlock;
 114 }
 115
 116
 117 /**
 118  * Return bits per component for the given format.
 119  * \param format  one of MESA_FORMAT_x
 120  * \param pname  the component, such as GL_RED_BITS, GL_TEXTURE_BLUE_BITS, etc.
 121  */
 122 GLint
 123 _mesa_get_format_bits(mesa_format format, GLenum pname)
 124 {
 125    const struct gl_format_info *info = _mesa_get_format_info(format);
 126
 127    switch (pname) {
 128    case GL_RED_BITS:
 129    case GL_TEXTURE_RED_SIZE:
 130    case GL_RENDERBUFFER_RED_SIZE_EXT:
 131    case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
 132       return info->RedBits;
 133    case GL_GREEN_BITS:
 134    case GL_TEXTURE_GREEN_SIZE:
 135    case GL_RENDERBUFFER_GREEN_SIZE_EXT:
 136    case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
 137       return info->GreenBits;
 138    case GL_BLUE_BITS:
 139    case GL_TEXTURE_BLUE_SIZE:
 140    case GL_RENDERBUFFER_BLUE_SIZE_EXT:
 141    case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
 142       return info->BlueBits;
 143    case GL_ALPHA_BITS:
 144    case GL_TEXTURE_ALPHA_SIZE:
 145    case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
 146    case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
 147       return info->AlphaBits;
 148    case GL_TEXTURE_INTENSITY_SIZE:
 149       return info->IntensityBits;
 150    case GL_TEXTURE_LUMINANCE_SIZE:
 151       return info->LuminanceBits;
 152    case GL_INDEX_BITS:
 153       return 0;
 154    case GL_DEPTH_BITS:
 155    case GL_TEXTURE_DEPTH_SIZE_ARB:
 156    case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
 157    case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
 158       return info->DepthBits;
 159    case GL_STENCIL_BITS:
 160    case GL_TEXTURE_STENCIL_SIZE_EXT:
 161    case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
 162    case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
 163       return info->StencilBits;
 164    default:
 165       _mesa_problem(NULL, "bad pname in _mesa_get_format_bits()");
 166       return 0;
 167    }
 168 }
 169
 170
 171 GLuint
 172 _mesa_get_format_max_bits(mesa_format format)
 173 {
 174    const struct gl_format_info *info = _mesa_get_format_info(format);
 175    GLuint max = MAX2(info->RedBits, info->GreenBits);
 176    max = MAX2(max, info->BlueBits);
 177    max = MAX2(max, info->AlphaBits);
 178    max = MAX2(max, info->LuminanceBits);
 179    max = MAX2(max, info->IntensityBits);
 180    max = MAX2(max, info->DepthBits);
 181    max = MAX2(max, info->StencilBits);
 182    return max;
 183 }
 184
 185
 186 /**
 187  * Return the layout type of the given format.
 188  * The return value will be one of:
 189  *    MESA_FORMAT_LAYOUT_ARRAY
 190  *    MESA_FORMAT_LAYOUT_PACKED
 191  *    MESA_FORMAT_LAYOUT_OTHER
 192  */
 193 extern enum mesa_format_layout
 194 _mesa_get_format_layout(mesa_format format)
 195 {
 196    const struct gl_format_info *info = _mesa_get_format_info(format);
 197    return info->Layout;
 198 }
 199
 200
 201 /**
 202  * Return the data type (or more specifically, the data representation)
 203  * for the given format.
 204  * The return value will be one of:
 205  *    GL_UNSIGNED_NORMALIZED = unsigned int representing [0,1]
 206  *    GL_SIGNED_NORMALIZED = signed int representing [-1, 1]
 207  *    GL_UNSIGNED_INT = an ordinary unsigned integer
 208  *    GL_INT = an ordinary signed integer
 209  *    GL_FLOAT = an ordinary float
 210  */
 211 GLenum
 212 _mesa_get_format_datatype(mesa_format format)
 213 {
 214    const struct gl_format_info *info = _mesa_get_format_info(format);
 215    return info->DataType;
 216 }
 217
 218 static GLenum
 219 get_base_format_for_array_format(mesa_array_format format)
 220 {
 221    uint8_t swizzle[4];
 222    int num_channels;
 223
 224    _mesa_array_format_get_swizzle(format, swizzle);
 225    num_channels = _mesa_array_format_get_num_channels(format);
 226
 227    switch (num_channels) {
 228    case 4:
 229       /* FIXME: RGBX formats have 4 channels, but their base format is GL_RGB.
 230        * This is not really a problem for now because we only create array
 231        * formats from GL format/type combinations, and these cannot specify
 232        * RGBX formats.
 233        */
 234       return GL_RGBA;
 235    case 3:
 236       return GL_RGB;
 237    case 2:
 238       if (swizzle[0] == 0 &&
 239           swizzle[1] == 0 &&
 240           swizzle[2] == 0 &&
 241           swizzle[3] == 1)
 242          return GL_LUMINANCE_ALPHA;
 243       if (swizzle[0] == 1 &&
 244           swizzle[1] == 1 &&
 245           swizzle[2] == 1 &&
 246           swizzle[3] == 0)
 247          return GL_LUMINANCE_ALPHA;
 248       if (swizzle[0] == 0 &&
 249           swizzle[1] == 1 &&
 250           swizzle[2] == 4 &&
 251           swizzle[3] == 5)
 252          return GL_RG;
 253       if (swizzle[0] == 1 &&
 254           swizzle[1] == 0 &&
 255           swizzle[2] == 4 &&
 256           swizzle[3] == 5)
 257          return GL_RG;
 258       break;
 259    case 1:
 260       if (swizzle[0] == 0 &&
 261           swizzle[1] == 0 &&
 262           swizzle[2] == 0 &&
 263           swizzle[3] == 5)
 264          return GL_LUMINANCE;
 265       if (swizzle[0] == 0 &&
 266           swizzle[1] == 0 &&
 267           swizzle[2] == 0 &&
 268           swizzle[3] == 0)
 269          return GL_INTENSITY;
 270       if (swizzle[0] <= MESA_FORMAT_SWIZZLE_W)
 271          return GL_RED;
 272       if (swizzle[1] <= MESA_FORMAT_SWIZZLE_W)
 273          return GL_GREEN;
 274       if (swizzle[2] <= MESA_FORMAT_SWIZZLE_W)
 275          return GL_BLUE;
 276       if (swizzle[3] <= MESA_FORMAT_SWIZZLE_W)
 277          return GL_ALPHA;
 278       break;
 279    }
 280
 281    unreachable("Unsupported format");
 282 }
 283
 284 /**
 285  * Return the basic format for the given type.  The result will be one of
 286  * GL_RGB, GL_RGBA, GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY,
 287  * GL_YCBCR_MESA, GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
 288  * This functions accepts a mesa_format or a mesa_array_format.
 289  */
 290 GLenum
 291 _mesa_get_format_base_format(uint32_t format)
 292 {
 293    if (!_mesa_format_is_mesa_array_format(format)) {
 294       const struct gl_format_info *info = _mesa_get_format_info(format);
 295       return info->BaseFormat;
 296    } else {
 297       return get_base_format_for_array_format(format);
 298    }
 299 }
 300
 301
 302 /**
 303  * Return the block size (in pixels) for the given format.  Normally
 304  * the block size is 1x1.  But compressed formats will have block sizes
 305  * of 4x4 or 8x4 pixels, etc.
 306  * \param bw  returns block width in pixels
 307  * \param bh  returns block height in pixels
 308  */
 309 void
 310 _mesa_get_format_block_size(mesa_format format, GLuint *bw, GLuint *bh)
 311 {
 312    const struct gl_format_info *info = _mesa_get_format_info(format);
 313    *bw = info->BlockWidth;
 314    *bh = info->BlockHeight;
 315 }
 316
 317
 318 /**
 319  * Returns the an array of four numbers representing the transformation
 320  * from the RGBA or SZ colorspace to the given format.  For array formats,
 321  * the i'th RGBA component is given by:
 322  *
 323  * if (swizzle[i] <= MESA_FORMAT_SWIZZLE_W)
 324  *    comp = data[swizzle[i]];
 325  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ZERO)
 326  *    comp = 0;
 327  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ONE)
 328  *    comp = 1;
 329  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_NONE)
 330  *    // data does not contain a channel of this format
 331  *
 332  * For packed formats, the swizzle gives the number of components left of
 333  * the least significant bit.
 334  *
 335  * Compressed formats have no swizzle.
 336  */
 337 void
 338 _mesa_get_format_swizzle(mesa_format format, uint8_t swizzle_out[4])
 339 {
 340    const struct gl_format_info *info = _mesa_get_format_info(format);
 341    memcpy(swizzle_out, info->Swizzle, sizeof(info->Swizzle));
 342 }
 343
 344 mesa_array_format
 345 _mesa_array_format_flip_channels(mesa_array_format format)
 346 {
 347    int num_channels;
 348    uint8_t swizzle[4];
 349
 350    num_channels = _mesa_array_format_get_num_channels(format);
 351    _mesa_array_format_get_swizzle(format, swizzle);
 352
 353    if (num_channels == 1)
 354       return format;
 355
 356    if (num_channels == 2) {
 357       _mesa_array_format_set_swizzle(&format, swizzle[1], swizzle[0],
 358                                      swizzle[2], swizzle[3]);
 359       return format;
 360    }
 361
 362    if (num_channels == 4) {
 363       _mesa_array_format_set_swizzle(&format, swizzle[3], swizzle[2],
 364                                      swizzle[1], swizzle[0]);
 365       return format;
 366    }
 367
 368    unreachable("Invalid array format");
 369 }
 370
 371 uint32_t
 372 _mesa_format_to_array_format(mesa_format format)
 373 {
 374    const struct gl_format_info *info = _mesa_get_format_info(format);
 375    if (_mesa_little_endian())
 376       return info->ArrayFormat;
 377    else
 378       return _mesa_array_format_flip_channels(info->ArrayFormat);
 379 }
 380
 381 static struct hash_table *format_array_format_table;
 382 static once_flag format_array_format_table_exists = ONCE_FLAG_INIT;
 383
 384 static bool
 385 array_formats_equal(const void *a, const void *b)
 386 {
 387    return (intptr_t)a == (intptr_t)b;
 388 }
 389
 390 static void
 391 format_array_format_table_init(void)
 392 {
 393    const struct gl_format_info *info;
 394    mesa_array_format array_format;
 395    unsigned f;
 396
 397    format_array_format_table = _mesa_hash_table_create(NULL, NULL,
 398                                                        array_formats_equal);
 399
 400    if (!format_array_format_table) {
 401       _mesa_error_no_memory(__func__);
 402       return;
 403    }
 404
 405    for (f = 1; f < MESA_FORMAT_COUNT; ++f) {
 406       info = _mesa_get_format_info(f);
 407       if (!info->ArrayFormat)
 408          continue;
 409
 410       if (_mesa_little_endian()) {
 411          array_format = info->ArrayFormat;
 412       } else {
 413          array_format = _mesa_array_format_flip_channels(info->ArrayFormat);
 414       }
 415
 416       /* This can happen and does for some of the BGR formats.  Let's take
 417        * the first one in the list.
 418        */
 419       if (_mesa_hash_table_search_pre_hashed(format_array_format_table,
 420                                              array_format,
 421                                              (void *)(intptr_t)array_format))
 422          continue;
 423
 424       _mesa_hash_table_insert_pre_hashed(format_array_format_table,
 425                                          array_format,
 426                                          (void *)(intptr_t)array_format,
 427                                          (void *)(intptr_t)f);
 428    }
 429 }
 430
 431 mesa_format
 432 _mesa_format_from_array_format(uint32_t array_format)
 433 {
 434    struct hash_entry *entry;
 435
 436    assert(_mesa_format_is_mesa_array_format(array_format));
 437
 438    call_once(&format_array_format_table_exists, format_array_format_table_init);
 439
 440    if (!format_array_format_table) {
 441       format_array_format_table_exists = ONCE_FLAG_INIT;
 442       return MESA_FORMAT_NONE;
 443    }
 444
 445    entry = _mesa_hash_table_search_pre_hashed(format_array_format_table,
 446                                               array_format,
 447                                               (void *)(intptr_t)array_format);
 448    if (entry)
 449       return (intptr_t)entry->data;
 450    else
 451       return MESA_FORMAT_NONE;
 452 }
 453
 454 /** Is the given format a compressed format? */
 455 GLboolean
 456 _mesa_is_format_compressed(mesa_format format)
 457 {
 458    const struct gl_format_info *info = _mesa_get_format_info(format);
 459    return info->BlockWidth > 1 || info->BlockHeight > 1;
 460 }
 461
 462
 463 /**
 464  * Determine if the given format represents a packed depth/stencil buffer.
 465  */
 466 GLboolean
 467 _mesa_is_format_packed_depth_stencil(mesa_format format)
 468 {
 469    const struct gl_format_info *info = _mesa_get_format_info(format);
 470
 471    return info->BaseFormat == GL_DEPTH_STENCIL;
 472 }
 473
 474
 475 /**
 476  * Is the given format a signed/unsigned integer color format?
 477  */
 478 GLboolean
 479 _mesa_is_format_integer_color(mesa_format format)
 480 {
 481    const struct gl_format_info *info = _mesa_get_format_info(format);
 482    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT) &&
 483       info->BaseFormat != GL_DEPTH_COMPONENT &&
 484       info->BaseFormat != GL_DEPTH_STENCIL &&
 485       info->BaseFormat != GL_STENCIL_INDEX;
 486 }
 487
 488
 489 /**
 490  * Is the given format an unsigned integer format?
 491  */
 492 GLboolean
 493 _mesa_is_format_unsigned(mesa_format format)
 494 {
 495    const struct gl_format_info *info = _mesa_get_format_info(format);
 496    return _mesa_is_type_unsigned(info->DataType);
 497 }
 498
 499
 500 /**
 501  * Does the given format store signed values?
 502  */
 503 GLboolean
 504 _mesa_is_format_signed(mesa_format format)
 505 {
 506    if (format == MESA_FORMAT_R11G11B10_FLOAT ||
 507        format == MESA_FORMAT_R9G9B9E5_FLOAT) {
 508       /* these packed float formats only store unsigned values */
 509       return GL_FALSE;
 510    }
 511    else {
 512       const struct gl_format_info *info = _mesa_get_format_info(format);
 513       return (info->DataType == GL_SIGNED_NORMALIZED ||
 514               info->DataType == GL_INT ||
 515               info->DataType == GL_FLOAT);
 516    }
 517 }
 518
 519 /**
 520  * Is the given format an integer format?
 521  */
 522 GLboolean
 523 _mesa_is_format_integer(mesa_format format)
 524 {
 525    const struct gl_format_info *info = _mesa_get_format_info(format);
 526    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT);
 527 }
 528
 529
 530 /**
 531  * Return true if the given format is a color format.
 532  */
 533 GLenum
 534 _mesa_is_format_color_format(mesa_format format)
 535 {
 536    const struct gl_format_info *info = _mesa_get_format_info(format);
 537    switch (info->BaseFormat) {
 538    case GL_DEPTH_COMPONENT:
 539    case GL_STENCIL_INDEX:
 540    case GL_DEPTH_STENCIL:
 541       return false;
 542    default:
 543       return true;
 544    }
 545 }
 546
 547
 548 /**
 549  * Return color encoding for given format.
 550  * \return GL_LINEAR or GL_SRGB
 551  */
 552 GLenum
 553 _mesa_get_format_color_encoding(mesa_format format)
 554 {
 555    /* XXX this info should be encoded in gl_format_info */
 556    switch (format) {
 557    case MESA_FORMAT_BGR_SRGB8:
 558    case MESA_FORMAT_A8B8G8R8_SRGB:
 559    case MESA_FORMAT_B8G8R8A8_SRGB:
 560    case MESA_FORMAT_A8R8G8B8_SRGB:
 561    case MESA_FORMAT_R8G8B8A8_SRGB:
 562    case MESA_FORMAT_L_SRGB8:
 563    case MESA_FORMAT_L8A8_SRGB:
 564    case MESA_FORMAT_A8L8_SRGB:
 565    case MESA_FORMAT_SRGB_DXT1:
 566    case MESA_FORMAT_SRGBA_DXT1:
 567    case MESA_FORMAT_SRGBA_DXT3:
 568    case MESA_FORMAT_SRGBA_DXT5:
 569    case MESA_FORMAT_R8G8B8X8_SRGB:
 570    case MESA_FORMAT_ETC2_SRGB8:
 571    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 572    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 573    case MESA_FORMAT_B8G8R8X8_SRGB:
 574    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 575       return GL_SRGB;
 576    default:
 577       return GL_LINEAR;
 578    }
 579 }
 580
 581
 582 /**
 583  * Return TRUE if format is an ETC2 compressed format specified
 584  * by GL_ARB_ES3_compatibility.
 585  */
 586 bool
 587 _mesa_is_format_etc2(mesa_format format)
 588 {
 589    switch (format) {
 590    case MESA_FORMAT_ETC2_RGB8:
 591    case MESA_FORMAT_ETC2_SRGB8:
 592    case MESA_FORMAT_ETC2_RGBA8_EAC:
 593    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 594    case MESA_FORMAT_ETC2_R11_EAC:
 595    case MESA_FORMAT_ETC2_RG11_EAC:
 596    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 597    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 598    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 599    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 600       return GL_TRUE;
 601    default:
 602       return GL_FALSE;
 603    }
 604 }
 605
 606
 607 /**
 608  * For an sRGB format, return the corresponding linear color space format.
 609  * For non-sRGB formats, return the format as-is.
 610  */
 611 mesa_format
 612 _mesa_get_srgb_format_linear(mesa_format format)
 613 {
 614    switch (format) {
 615    case MESA_FORMAT_BGR_SRGB8:
 616       format = MESA_FORMAT_BGR_UNORM8;
 617       break;
 618    case MESA_FORMAT_A8B8G8R8_SRGB:
 619       format = MESA_FORMAT_A8B8G8R8_UNORM;
 620       break;
 621    case MESA_FORMAT_B8G8R8A8_SRGB:
 622       format = MESA_FORMAT_B8G8R8A8_UNORM;
 623       break;
 624    case MESA_FORMAT_A8R8G8B8_SRGB:
 625       format = MESA_FORMAT_A8R8G8B8_UNORM;
 626       break;
 627    case MESA_FORMAT_R8G8B8A8_SRGB:
 628       format = MESA_FORMAT_R8G8B8A8_UNORM;
 629       break;
 630    case MESA_FORMAT_L_SRGB8:
 631       format = MESA_FORMAT_L_UNORM8;
 632       break;
 633    case MESA_FORMAT_L8A8_SRGB:
 634       format = MESA_FORMAT_L8A8_UNORM;
 635       break;
 636    case MESA_FORMAT_A8L8_SRGB:
 637       format = MESA_FORMAT_A8L8_UNORM;
 638       break;
 639    case MESA_FORMAT_SRGB_DXT1:
 640       format = MESA_FORMAT_RGB_DXT1;
 641       break;
 642    case MESA_FORMAT_SRGBA_DXT1:
 643       format = MESA_FORMAT_RGBA_DXT1;
 644       break;
 645    case MESA_FORMAT_SRGBA_DXT3:
 646       format = MESA_FORMAT_RGBA_DXT3;
 647       break;
 648    case MESA_FORMAT_SRGBA_DXT5:
 649       format = MESA_FORMAT_RGBA_DXT5;
 650       break;
 651    case MESA_FORMAT_R8G8B8X8_SRGB:
 652       format = MESA_FORMAT_R8G8B8X8_UNORM;
 653       break;
 654    case MESA_FORMAT_X8B8G8R8_SRGB:
 655       format = MESA_FORMAT_X8B8G8R8_UNORM;
 656       break;
 657    case MESA_FORMAT_ETC2_SRGB8:
 658       format = MESA_FORMAT_ETC2_RGB8;
 659       break;
 660    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 661       format = MESA_FORMAT_ETC2_RGBA8_EAC;
 662       break;
 663    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 664       format = MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1;
 665       break;
 666    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 667       format = MESA_FORMAT_BPTC_RGBA_UNORM;
 668       break;
 669    case MESA_FORMAT_B8G8R8X8_SRGB:
 670       format = MESA_FORMAT_B8G8R8X8_UNORM;
 671       break;
 672    case MESA_FORMAT_X8R8G8B8_SRGB:
 673       format = MESA_FORMAT_X8R8G8B8_UNORM;
 674       break;
 675    default:
 676       break;
 677    }
 678    return format;
 679 }
 680
 681
 682 /**
 683  * If the given format is a compressed format, return a corresponding
 684  * uncompressed format.
 685  */
 686 mesa_format
 687 _mesa_get_uncompressed_format(mesa_format format)
 688 {
 689    switch (format) {
 690    case MESA_FORMAT_RGB_FXT1:
 691       return MESA_FORMAT_BGR_UNORM8;
 692    case MESA_FORMAT_RGBA_FXT1:
 693       return MESA_FORMAT_A8B8G8R8_UNORM;
 694    case MESA_FORMAT_RGB_DXT1:
 695    case MESA_FORMAT_SRGB_DXT1:
 696       return MESA_FORMAT_BGR_UNORM8;
 697    case MESA_FORMAT_RGBA_DXT1:
 698    case MESA_FORMAT_SRGBA_DXT1:
 699       return MESA_FORMAT_A8B8G8R8_UNORM;
 700    case MESA_FORMAT_RGBA_DXT3:
 701    case MESA_FORMAT_SRGBA_DXT3:
 702       return MESA_FORMAT_A8B8G8R8_UNORM;
 703    case MESA_FORMAT_RGBA_DXT5:
 704    case MESA_FORMAT_SRGBA_DXT5:
 705       return MESA_FORMAT_A8B8G8R8_UNORM;
 706    case MESA_FORMAT_R_RGTC1_UNORM:
 707       return MESA_FORMAT_R_UNORM8;
 708    case MESA_FORMAT_R_RGTC1_SNORM:
 709       return MESA_FORMAT_R_SNORM8;
 710    case MESA_FORMAT_RG_RGTC2_UNORM:
 711       return MESA_FORMAT_R8G8_UNORM;
 712    case MESA_FORMAT_RG_RGTC2_SNORM:
 713       return MESA_FORMAT_R8G8_SNORM;
 714    case MESA_FORMAT_L_LATC1_UNORM:
 715       return MESA_FORMAT_L_UNORM8;
 716    case MESA_FORMAT_L_LATC1_SNORM:
 717       return MESA_FORMAT_L_SNORM8;
 718    case MESA_FORMAT_LA_LATC2_UNORM:
 719       return MESA_FORMAT_L8A8_UNORM;
 720    case MESA_FORMAT_LA_LATC2_SNORM:
 721       return MESA_FORMAT_L8A8_SNORM;
 722    case MESA_FORMAT_ETC1_RGB8:
 723    case MESA_FORMAT_ETC2_RGB8:
 724    case MESA_FORMAT_ETC2_SRGB8:
 725       return MESA_FORMAT_BGR_UNORM8;
 726    case MESA_FORMAT_ETC2_RGBA8_EAC:
 727    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 728    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 729    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 730       return MESA_FORMAT_A8B8G8R8_UNORM;
 731    case MESA_FORMAT_ETC2_R11_EAC:
 732    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 733       return MESA_FORMAT_R_UNORM16;
 734    case MESA_FORMAT_ETC2_RG11_EAC:
 735    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 736       return MESA_FORMAT_R16G16_UNORM;
 737    case MESA_FORMAT_BPTC_RGBA_UNORM:
 738    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 739       return MESA_FORMAT_A8B8G8R8_UNORM;
 740    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
 741    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
 742       return MESA_FORMAT_RGB_FLOAT32;
 743    default:
 744 #ifdef DEBUG
 745       assert(!_mesa_is_format_compressed(format));
 746 #endif
 747       return format;
 748    }
 749 }
 750
 751
 752 GLuint
 753 _mesa_format_num_components(mesa_format format)
 754 {
 755    const struct gl_format_info *info = _mesa_get_format_info(format);
 756    return ((info->RedBits > 0) +
 757            (info->GreenBits > 0) +
 758            (info->BlueBits > 0) +
 759            (info->AlphaBits > 0) +
 760            (info->LuminanceBits > 0) +
 761            (info->IntensityBits > 0) +
 762            (info->DepthBits > 0) +
 763            (info->StencilBits > 0));
 764 }
 765
 766
 767 /**
 768  * Returns true if a color format has data stored in the R/G/B/A channels,
 769  * given an index from 0 to 3.
 770  */
 771 bool
 772 _mesa_format_has_color_component(mesa_format format, int component)
 773 {
 774    const struct gl_format_info *info = _mesa_get_format_info(format);
 775
 776    assert(info->BaseFormat != GL_DEPTH_COMPONENT &&
 777           info->BaseFormat != GL_DEPTH_STENCIL &&
 778           info->BaseFormat != GL_STENCIL_INDEX);
 779
 780    switch (component) {
 781    case 0:
 782       return (info->RedBits + info->IntensityBits + info->LuminanceBits) > 0;
 783    case 1:
 784       return (info->GreenBits + info->IntensityBits + info->LuminanceBits) > 0;
 785    case 2:
 786       return (info->BlueBits + info->IntensityBits + info->LuminanceBits) > 0;
 787    case 3:
 788       return (info->AlphaBits + info->IntensityBits) > 0;
 789    default:
 790       assert(!"Invalid color component: must be 0..3");
 791       return false;
 792    }
 793 }
 794
 795
 796 /**
 797  * Return number of bytes needed to store an image of the given size
 798  * in the given format.
 799  */
 800 GLuint
 801 _mesa_format_image_size(mesa_format format, GLsizei width,
 802                         GLsizei height, GLsizei depth)
 803 {
 804    const struct gl_format_info *info = _mesa_get_format_info(format);
 805    /* Strictly speaking, a conditional isn't needed here */
 806    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 807       /* compressed format (2D only for now) */
 808       const GLuint bw = info->BlockWidth, bh = info->BlockHeight;
 809       const GLuint wblocks = (width + bw - 1) / bw;
 810       const GLuint hblocks = (height + bh - 1) / bh;
 811       const GLuint sz = wblocks * hblocks * info->BytesPerBlock;
 812       return sz * depth;
 813    }
 814    else {
 815       /* non-compressed */
 816       const GLuint sz = width * height * depth * info->BytesPerBlock;
 817       return sz;
 818    }
 819 }
 820
 821
 822 /**
 823  * Same as _mesa_format_image_size() but returns a 64-bit value to
 824  * accommodate very large textures.
 825  */
 826 uint64_t
 827 _mesa_format_image_size64(mesa_format format, GLsizei width,
 828                           GLsizei height, GLsizei depth)
 829 {
 830    const struct gl_format_info *info = _mesa_get_format_info(format);
 831    /* Strictly speaking, a conditional isn't needed here */
 832    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 833       /* compressed format (2D only for now) */
 834       const uint64_t bw = info->BlockWidth, bh = info->BlockHeight;
 835       const uint64_t wblocks = (width + bw - 1) / bw;
 836       const uint64_t hblocks = (height + bh - 1) / bh;
 837       const uint64_t sz = wblocks * hblocks * info->BytesPerBlock;
 838       return sz * depth;
 839    }
 840    else {
 841       /* non-compressed */
 842       const uint64_t sz = ((uint64_t) width *
 843                            (uint64_t) height *
 844                            (uint64_t) depth *
 845                            info->BytesPerBlock);
 846       return sz;
 847    }
 848 }
 849
 850
 851
 852 GLint
 853 _mesa_format_row_stride(mesa_format format, GLsizei width)
 854 {
 855    const struct gl_format_info *info = _mesa_get_format_info(format);
 856    /* Strictly speaking, a conditional isn't needed here */
 857    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 858       /* compressed format */
 859       const GLuint bw = info->BlockWidth;
 860       const GLuint wblocks = (width + bw - 1) / bw;
 861       const GLint stride = wblocks * info->BytesPerBlock;
 862       return stride;
 863    }
 864    else {
 865       const GLint stride = width * info->BytesPerBlock;
 866       return stride;
 867    }
 868 }
 869
 870
 871 /**
 872  * Debug/test: check that all formats are handled in the
 873  * _mesa_format_to_type_and_comps() function.  When new pixel formats
 874  * are added to Mesa, that function needs to be updated.
 875  * This is a no-op after the first call.
 876  */
 877 static void
 878 check_format_to_type_and_comps(void)
 879 {
 880    mesa_format f;
 881
 882    for (f = MESA_FORMAT_NONE + 1; f < MESA_FORMAT_COUNT; f++) {
 883       GLenum datatype = 0;
 884       GLuint comps = 0;
 885       /* This function will emit a problem/warning if the format is
 886        * not handled.
 887        */
 888       _mesa_format_to_type_and_comps(f, &datatype, &comps);
 889    }
 890 }
 891
 892 /**
 893  * Do sanity checking of the format info table.
 894  */
 895 void
 896 _mesa_test_formats(void)
 897 {
 898    GLuint i;
 899
 900    STATIC_ASSERT(ARRAY_SIZE(format_info) == MESA_FORMAT_COUNT);
 901
 902    for (i = 0; i < MESA_FORMAT_COUNT; i++) {
 903       const struct gl_format_info *info = _mesa_get_format_info(i);
 904       assert(info);
 905
 906       assert(info->Name == i);
 907
 908       if (info->Name == MESA_FORMAT_NONE)
 909          continue;
 910
 911       if (info->BlockWidth == 1 && info->BlockHeight == 1) {
 912          if (info->RedBits > 0) {
 913             GLuint t = info->RedBits + info->GreenBits
 914                + info->BlueBits + info->AlphaBits;
 915             assert(t / 8 <= info->BytesPerBlock);
 916             (void) t;
 917          }
 918       }
 919
 920       assert(info->DataType == GL_UNSIGNED_NORMALIZED ||
 921              info->DataType == GL_SIGNED_NORMALIZED ||
 922              info->DataType == GL_UNSIGNED_INT ||
 923              info->DataType == GL_INT ||
 924              info->DataType == GL_FLOAT ||
 925              /* Z32_FLOAT_X24S8 has DataType of GL_NONE */
 926              info->DataType == GL_NONE);
 927
 928       if (info->BaseFormat == GL_RGB) {
 929          assert(info->RedBits > 0);
 930          assert(info->GreenBits > 0);
 931          assert(info->BlueBits > 0);
 932          assert(info->AlphaBits == 0);
 933          assert(info->LuminanceBits == 0);
 934          assert(info->IntensityBits == 0);
 935       }
 936       else if (info->BaseFormat == GL_RGBA) {
 937          assert(info->RedBits > 0);
 938          assert(info->GreenBits > 0);
 939          assert(info->BlueBits > 0);
 940          assert(info->AlphaBits > 0);
 941          assert(info->LuminanceBits == 0);
 942          assert(info->IntensityBits == 0);
 943       }
 944       else if (info->BaseFormat == GL_RG) {
 945          assert(info->RedBits > 0);
 946          assert(info->GreenBits > 0);
 947          assert(info->BlueBits == 0);
 948          assert(info->AlphaBits == 0);
 949          assert(info->LuminanceBits == 0);
 950          assert(info->IntensityBits == 0);
 951       }
 952       else if (info->BaseFormat == GL_RED) {
 953          assert(info->RedBits > 0);
 954          assert(info->GreenBits == 0);
 955          assert(info->BlueBits == 0);
 956          assert(info->AlphaBits == 0);
 957          assert(info->LuminanceBits == 0);
 958          assert(info->IntensityBits == 0);
 959       }
 960       else if (info->BaseFormat == GL_LUMINANCE) {
 961          assert(info->RedBits == 0);
 962          assert(info->GreenBits == 0);
 963          assert(info->BlueBits == 0);
 964          assert(info->AlphaBits == 0);
 965          assert(info->LuminanceBits > 0);
 966          assert(info->IntensityBits == 0);
 967       }
 968       else if (info->BaseFormat == GL_INTENSITY) {
 969          assert(info->RedBits == 0);
 970          assert(info->GreenBits == 0);
 971          assert(info->BlueBits == 0);
 972          assert(info->AlphaBits == 0);
 973          assert(info->LuminanceBits == 0);
 974          assert(info->IntensityBits > 0);
 975       }
 976    }
 977
 978    check_format_to_type_and_comps();
 979 }
 980
 981
 982
 983 /**
 984  * Return datatype and number of components per texel for the given mesa_format.
 985  * Only used for mipmap generation code.
 986  */
 987 void
 988 _mesa_format_to_type_and_comps(mesa_format format,
 989                                GLenum *datatype, GLuint *comps)
 990 {
 991    switch (format) {
 992    case MESA_FORMAT_A8B8G8R8_UNORM:
 993    case MESA_FORMAT_R8G8B8A8_UNORM:
 994    case MESA_FORMAT_B8G8R8A8_UNORM:
 995    case MESA_FORMAT_A8R8G8B8_UNORM:
 996    case MESA_FORMAT_X8B8G8R8_UNORM:
 997    case MESA_FORMAT_R8G8B8X8_UNORM:
 998    case MESA_FORMAT_B8G8R8X8_UNORM:
 999    case MESA_FORMAT_X8R8G8B8_UNORM:
1000       *datatype = GL_UNSIGNED_BYTE;
1001       *comps = 4;
1002       return;
1003    case MESA_FORMAT_BGR_UNORM8:
1004    case MESA_FORMAT_RGB_UNORM8:
1005       *datatype = GL_UNSIGNED_BYTE;
1006       *comps = 3;
1007       return;
1008    case MESA_FORMAT_B5G6R5_UNORM:
1009    case MESA_FORMAT_R5G6B5_UNORM:
1010       *datatype = GL_UNSIGNED_SHORT_5_6_5;
1011       *comps = 3;
1012       return;
1013
1014    case MESA_FORMAT_B4G4R4A4_UNORM:
1015    case MESA_FORMAT_A4R4G4B4_UNORM:
1016    case MESA_FORMAT_B4G4R4X4_UNORM:
1017       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
1018       *comps = 4;
1019       return;
1020
1021    case MESA_FORMAT_B5G5R5A1_UNORM:
1022    case MESA_FORMAT_A1R5G5B5_UNORM:
1023    case MESA_FORMAT_B5G5R5X1_UNORM:
1024       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
1025       *comps = 4;
1026       return;
1027
1028    case MESA_FORMAT_B10G10R10A2_UNORM:
1029       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1030       *comps = 4;
1031       return;
1032
1033    case MESA_FORMAT_A1B5G5R5_UNORM:
1034       *datatype = GL_UNSIGNED_SHORT_5_5_5_1;
1035       *comps = 4;
1036       return;
1037
1038    case MESA_FORMAT_L4A4_UNORM:
1039       *datatype = MESA_UNSIGNED_BYTE_4_4;
1040       *comps = 2;
1041       return;
1042
1043    case MESA_FORMAT_L8A8_UNORM:
1044    case MESA_FORMAT_A8L8_UNORM:
1045    case MESA_FORMAT_R8G8_UNORM:
1046    case MESA_FORMAT_G8R8_UNORM:
1047       *datatype = GL_UNSIGNED_BYTE;
1048       *comps = 2;
1049       return;
1050
1051    case MESA_FORMAT_L16A16_UNORM:
1052    case MESA_FORMAT_A16L16_UNORM:
1053    case MESA_FORMAT_R16G16_UNORM:
1054    case MESA_FORMAT_G16R16_UNORM:
1055       *datatype = GL_UNSIGNED_SHORT;
1056       *comps = 2;
1057       return;
1058
1059    case MESA_FORMAT_R_UNORM16:
1060    case MESA_FORMAT_A_UNORM16:
1061    case MESA_FORMAT_L_UNORM16:
1062    case MESA_FORMAT_I_UNORM16:
1063       *datatype = GL_UNSIGNED_SHORT;
1064       *comps = 1;
1065       return;
1066
1067    case MESA_FORMAT_R3G3B2_UNORM:
1068       *datatype = GL_UNSIGNED_BYTE_2_3_3_REV;
1069       *comps = 3;
1070       return;
1071    case MESA_FORMAT_A4B4G4R4_UNORM:
1072       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
1073       *comps = 4;
1074       return;
1075
1076    case MESA_FORMAT_R4G4B4A4_UNORM:
1077       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
1078       *comps = 4;
1079       return;
1080    case MESA_FORMAT_R5G5B5A1_UNORM:
1081       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
1082       *comps = 4;
1083       return;
1084    case MESA_FORMAT_A2B10G10R10_UNORM:
1085    case MESA_FORMAT_A2B10G10R10_UINT:
1086       *datatype = GL_UNSIGNED_INT_10_10_10_2;
1087       *comps = 4;
1088       return;
1089    case MESA_FORMAT_A2R10G10B10_UNORM:
1090    case MESA_FORMAT_A2R10G10B10_UINT:
1091       *datatype = GL_UNSIGNED_INT_10_10_10_2;
1092       *comps = 4;
1093       return;
1094
1095    case MESA_FORMAT_B2G3R3_UNORM:
1096       *datatype = GL_UNSIGNED_BYTE_3_3_2;
1097       *comps = 3;
1098       return;
1099
1100    case MESA_FORMAT_A_UNORM8:
1101    case MESA_FORMAT_L_UNORM8:
1102    case MESA_FORMAT_I_UNORM8:
1103    case MESA_FORMAT_R_UNORM8:
1104    case MESA_FORMAT_S_UINT8:
1105       *datatype = GL_UNSIGNED_BYTE;
1106       *comps = 1;
1107       return;
1108
1109    case MESA_FORMAT_YCBCR:
1110    case MESA_FORMAT_YCBCR_REV:
1111       *datatype = GL_UNSIGNED_SHORT;
1112       *comps = 2;
1113       return;
1114
1115    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1116       *datatype = GL_UNSIGNED_INT_24_8_MESA;
1117       *comps = 2;
1118       return;
1119
1120    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1121       *datatype = GL_UNSIGNED_INT_8_24_REV_MESA;
1122       *comps = 2;
1123       return;
1124
1125    case MESA_FORMAT_Z_UNORM16:
1126       *datatype = GL_UNSIGNED_SHORT;
1127       *comps = 1;
1128       return;
1129
1130    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1131       *datatype = GL_UNSIGNED_INT;
1132       *comps = 1;
1133       return;
1134
1135    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1136       *datatype = GL_UNSIGNED_INT;
1137       *comps = 1;
1138       return;
1139
1140    case MESA_FORMAT_Z_UNORM32:
1141       *datatype = GL_UNSIGNED_INT;
1142       *comps = 1;
1143       return;
1144
1145    case MESA_FORMAT_Z_FLOAT32:
1146       *datatype = GL_FLOAT;
1147       *comps = 1;
1148       return;
1149
1150    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
1151       *datatype = GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
1152       *comps = 1;
1153       return;
1154
1155    case MESA_FORMAT_R_SNORM8:
1156    case MESA_FORMAT_A_SNORM8:
1157    case MESA_FORMAT_L_SNORM8:
1158    case MESA_FORMAT_I_SNORM8:
1159       *datatype = GL_BYTE;
1160       *comps = 1;
1161       return;
1162    case MESA_FORMAT_R8G8_SNORM:
1163    case MESA_FORMAT_L8A8_SNORM:
1164    case MESA_FORMAT_A8L8_SNORM:
1165       *datatype = GL_BYTE;
1166       *comps = 2;
1167       return;
1168    case MESA_FORMAT_A8B8G8R8_SNORM:
1169    case MESA_FORMAT_R8G8B8A8_SNORM:
1170    case MESA_FORMAT_X8B8G8R8_SNORM:
1171       *datatype = GL_BYTE;
1172       *comps = 4;
1173       return;
1174
1175    case MESA_FORMAT_RGBA_UNORM16:
1176       *datatype = GL_UNSIGNED_SHORT;
1177       *comps = 4;
1178       return;
1179
1180    case MESA_FORMAT_R_SNORM16:
1181    case MESA_FORMAT_A_SNORM16:
1182    case MESA_FORMAT_L_SNORM16:
1183    case MESA_FORMAT_I_SNORM16:
1184       *datatype = GL_SHORT;
1185       *comps = 1;
1186       return;
1187    case MESA_FORMAT_R16G16_SNORM:
1188    case MESA_FORMAT_LA_SNORM16:
1189       *datatype = GL_SHORT;
1190       *comps = 2;
1191       return;
1192    case MESA_FORMAT_RGB_SNORM16:
1193       *datatype = GL_SHORT;
1194       *comps = 3;
1195       return;
1196    case MESA_FORMAT_RGBA_SNORM16:
1197       *datatype = GL_SHORT;
1198       *comps = 4;
1199       return;
1200
1201    case MESA_FORMAT_BGR_SRGB8:
1202       *datatype = GL_UNSIGNED_BYTE;
1203       *comps = 3;
1204       return;
1205    case MESA_FORMAT_A8B8G8R8_SRGB:
1206    case MESA_FORMAT_B8G8R8A8_SRGB:
1207    case MESA_FORMAT_A8R8G8B8_SRGB:
1208    case MESA_FORMAT_R8G8B8A8_SRGB:
1209       *datatype = GL_UNSIGNED_BYTE;
1210       *comps = 4;
1211       return;
1212    case MESA_FORMAT_L_SRGB8:
1213       *datatype = GL_UNSIGNED_BYTE;
1214       *comps = 1;
1215       return;
1216    case MESA_FORMAT_L8A8_SRGB:
1217    case MESA_FORMAT_A8L8_SRGB:
1218       *datatype = GL_UNSIGNED_BYTE;
1219       *comps = 2;
1220       return;
1221
1222    case MESA_FORMAT_RGB_FXT1:
1223    case MESA_FORMAT_RGBA_FXT1:
1224    case MESA_FORMAT_RGB_DXT1:
1225    case MESA_FORMAT_RGBA_DXT1:
1226    case MESA_FORMAT_RGBA_DXT3:
1227    case MESA_FORMAT_RGBA_DXT5:
1228    case MESA_FORMAT_SRGB_DXT1:
1229    case MESA_FORMAT_SRGBA_DXT1:
1230    case MESA_FORMAT_SRGBA_DXT3:
1231    case MESA_FORMAT_SRGBA_DXT5:
1232    case MESA_FORMAT_R_RGTC1_UNORM:
1233    case MESA_FORMAT_R_RGTC1_SNORM:
1234    case MESA_FORMAT_RG_RGTC2_UNORM:
1235    case MESA_FORMAT_RG_RGTC2_SNORM:
1236    case MESA_FORMAT_L_LATC1_UNORM:
1237    case MESA_FORMAT_L_LATC1_SNORM:
1238    case MESA_FORMAT_LA_LATC2_UNORM:
1239    case MESA_FORMAT_LA_LATC2_SNORM:
1240    case MESA_FORMAT_ETC1_RGB8:
1241    case MESA_FORMAT_ETC2_RGB8:
1242    case MESA_FORMAT_ETC2_SRGB8:
1243    case MESA_FORMAT_ETC2_RGBA8_EAC:
1244    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
1245    case MESA_FORMAT_ETC2_R11_EAC:
1246    case MESA_FORMAT_ETC2_RG11_EAC:
1247    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
1248    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
1249    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
1250    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
1251    case MESA_FORMAT_BPTC_RGBA_UNORM:
1252    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
1253    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
1254    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
1255       /* XXX generate error instead? */
1256       *datatype = GL_UNSIGNED_BYTE;
1257       *comps = 0;
1258       return;
1259
1260    case MESA_FORMAT_RGBA_FLOAT32:
1261       *datatype = GL_FLOAT;
1262       *comps = 4;
1263       return;
1264    case MESA_FORMAT_RGBA_FLOAT16:
1265       *datatype = GL_HALF_FLOAT_ARB;
1266       *comps = 4;
1267       return;
1268    case MESA_FORMAT_RGB_FLOAT32:
1269       *datatype = GL_FLOAT;
1270       *comps = 3;
1271       return;
1272    case MESA_FORMAT_RGB_FLOAT16:
1273       *datatype = GL_HALF_FLOAT_ARB;
1274       *comps = 3;
1275       return;
1276    case MESA_FORMAT_LA_FLOAT32:
1277    case MESA_FORMAT_RG_FLOAT32:
1278       *datatype = GL_FLOAT;
1279       *comps = 2;
1280       return;
1281    case MESA_FORMAT_LA_FLOAT16:
1282    case MESA_FORMAT_RG_FLOAT16:
1283       *datatype = GL_HALF_FLOAT_ARB;
1284       *comps = 2;
1285       return;
1286    case MESA_FORMAT_A_FLOAT32:
1287    case MESA_FORMAT_L_FLOAT32:
1288    case MESA_FORMAT_I_FLOAT32:
1289    case MESA_FORMAT_R_FLOAT32:
1290       *datatype = GL_FLOAT;
1291       *comps = 1;
1292       return;
1293    case MESA_FORMAT_A_FLOAT16:
1294    case MESA_FORMAT_L_FLOAT16:
1295    case MESA_FORMAT_I_FLOAT16:
1296    case MESA_FORMAT_R_FLOAT16:
1297       *datatype = GL_HALF_FLOAT_ARB;
1298       *comps = 1;
1299       return;
1300
1301    case MESA_FORMAT_A_UINT8:
1302    case MESA_FORMAT_L_UINT8:
1303    case MESA_FORMAT_I_UINT8:
1304       *datatype = GL_UNSIGNED_BYTE;
1305       *comps = 1;
1306       return;
1307    case MESA_FORMAT_LA_UINT8:
1308       *datatype = GL_UNSIGNED_BYTE;
1309       *comps = 2;
1310       return;
1311
1312    case MESA_FORMAT_A_UINT16:
1313    case MESA_FORMAT_L_UINT16:
1314    case MESA_FORMAT_I_UINT16:
1315       *datatype = GL_UNSIGNED_SHORT;
1316       *comps = 1;
1317       return;
1318    case MESA_FORMAT_LA_UINT16:
1319       *datatype = GL_UNSIGNED_SHORT;
1320       *comps = 2;
1321       return;
1322    case MESA_FORMAT_A_UINT32:
1323    case MESA_FORMAT_L_UINT32:
1324    case MESA_FORMAT_I_UINT32:
1325       *datatype = GL_UNSIGNED_INT;
1326       *comps = 1;
1327       return;
1328    case MESA_FORMAT_LA_UINT32:
1329       *datatype = GL_UNSIGNED_INT;
1330       *comps = 2;
1331       return;
1332    case MESA_FORMAT_A_SINT8:
1333    case MESA_FORMAT_L_SINT8:
1334    case MESA_FORMAT_I_SINT8:
1335       *datatype = GL_BYTE;
1336       *comps = 1;
1337       return;
1338    case MESA_FORMAT_LA_SINT8:
1339       *datatype = GL_BYTE;
1340       *comps = 2;
1341       return;
1342
1343    case MESA_FORMAT_A_SINT16:
1344    case MESA_FORMAT_L_SINT16:
1345    case MESA_FORMAT_I_SINT16:
1346       *datatype = GL_SHORT;
1347       *comps = 1;
1348       return;
1349    case MESA_FORMAT_LA_SINT16:
1350       *datatype = GL_SHORT;
1351       *comps = 2;
1352       return;
1353
1354    case MESA_FORMAT_A_SINT32:
1355    case MESA_FORMAT_L_SINT32:
1356    case MESA_FORMAT_I_SINT32:
1357       *datatype = GL_INT;
1358       *comps = 1;
1359       return;
1360    case MESA_FORMAT_LA_SINT32:
1361       *datatype = GL_INT;
1362       *comps = 2;
1363       return;
1364
1365    case MESA_FORMAT_R_SINT8:
1366       *datatype = GL_BYTE;
1367       *comps = 1;
1368       return;
1369    case MESA_FORMAT_RG_SINT8:
1370       *datatype = GL_BYTE;
1371       *comps = 2;
1372       return;
1373    case MESA_FORMAT_RGB_SINT8:
1374       *datatype = GL_BYTE;
1375       *comps = 3;
1376       return;
1377    case MESA_FORMAT_RGBA_SINT8:
1378       *datatype = GL_BYTE;
1379       *comps = 4;
1380       return;
1381    case MESA_FORMAT_R_SINT16:
1382       *datatype = GL_SHORT;
1383       *comps = 1;
1384       return;
1385    case MESA_FORMAT_RG_SINT16:
1386       *datatype = GL_SHORT;
1387       *comps = 2;
1388       return;
1389    case MESA_FORMAT_RGB_SINT16:
1390       *datatype = GL_SHORT;
1391       *comps = 3;
1392       return;
1393    case MESA_FORMAT_RGBA_SINT16:
1394       *datatype = GL_SHORT;
1395       *comps = 4;
1396       return;
1397    case MESA_FORMAT_R_SINT32:
1398       *datatype = GL_INT;
1399       *comps = 1;
1400       return;
1401    case MESA_FORMAT_RG_SINT32:
1402       *datatype = GL_INT;
1403       *comps = 2;
1404       return;
1405    case MESA_FORMAT_RGB_SINT32:
1406       *datatype = GL_INT;
1407       *comps = 3;
1408       return;
1409    case MESA_FORMAT_RGBA_SINT32:
1410       *datatype = GL_INT;
1411       *comps = 4;
1412       return;
1413
1414    /**
1415     * \name Non-normalized unsigned integer formats.
1416     */
1417    case MESA_FORMAT_R_UINT8:
1418       *datatype = GL_UNSIGNED_BYTE;
1419       *comps = 1;
1420       return;
1421    case MESA_FORMAT_RG_UINT8:
1422       *datatype = GL_UNSIGNED_BYTE;
1423       *comps = 2;
1424       return;
1425    case MESA_FORMAT_RGB_UINT8:
1426       *datatype = GL_UNSIGNED_BYTE;
1427       *comps = 3;
1428       return;
1429    case MESA_FORMAT_RGBA_UINT8:
1430       *datatype = GL_UNSIGNED_BYTE;
1431       *comps = 4;
1432       return;
1433    case MESA_FORMAT_R_UINT16:
1434       *datatype = GL_UNSIGNED_SHORT;
1435       *comps = 1;
1436       return;
1437    case MESA_FORMAT_RG_UINT16:
1438       *datatype = GL_UNSIGNED_SHORT;
1439       *comps = 2;
1440       return;
1441    case MESA_FORMAT_RGB_UINT16:
1442       *datatype = GL_UNSIGNED_SHORT;
1443       *comps = 3;
1444       return;
1445    case MESA_FORMAT_RGBA_UINT16:
1446       *datatype = GL_UNSIGNED_SHORT;
1447       *comps = 4;
1448       return;
1449    case MESA_FORMAT_R_UINT32:
1450       *datatype = GL_UNSIGNED_INT;
1451       *comps = 1;
1452       return;
1453    case MESA_FORMAT_RG_UINT32:
1454       *datatype = GL_UNSIGNED_INT;
1455       *comps = 2;
1456       return;
1457    case MESA_FORMAT_RGB_UINT32:
1458       *datatype = GL_UNSIGNED_INT;
1459       *comps = 3;
1460       return;
1461    case MESA_FORMAT_RGBA_UINT32:
1462       *datatype = GL_UNSIGNED_INT;
1463       *comps = 4;
1464       return;
1465
1466    case MESA_FORMAT_R9G9B9E5_FLOAT:
1467       *datatype = GL_UNSIGNED_INT_5_9_9_9_REV;
1468       *comps = 3;
1469       return;
1470
1471    case MESA_FORMAT_R11G11B10_FLOAT:
1472       *datatype = GL_UNSIGNED_INT_10F_11F_11F_REV;
1473       *comps = 3;
1474       return;
1475
1476    case MESA_FORMAT_B10G10R10A2_UINT:
1477    case MESA_FORMAT_R10G10B10A2_UINT:
1478       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1479       *comps = 4;
1480       return;
1481
1482    case MESA_FORMAT_R8G8B8X8_SRGB:
1483    case MESA_FORMAT_X8B8G8R8_SRGB:
1484    case MESA_FORMAT_RGBX_UINT8:
1485       *datatype = GL_UNSIGNED_BYTE;
1486       *comps = 4;
1487       return;
1488
1489    case MESA_FORMAT_R8G8B8X8_SNORM:
1490    case MESA_FORMAT_RGBX_SINT8:
1491       *datatype = GL_BYTE;
1492       *comps = 4;
1493       return;
1494
1495    case MESA_FORMAT_B10G10R10X2_UNORM:
1496    case MESA_FORMAT_R10G10B10X2_UNORM:
1497       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1498       *comps = 4;
1499       return;
1500
1501    case MESA_FORMAT_RGBX_UNORM16:
1502    case MESA_FORMAT_RGBX_UINT16:
1503       *datatype = GL_UNSIGNED_SHORT;
1504       *comps = 4;
1505       return;
1506
1507    case MESA_FORMAT_RGBX_SNORM16:
1508    case MESA_FORMAT_RGBX_SINT16:
1509       *datatype = GL_SHORT;
1510       *comps = 4;
1511       return;
1512
1513    case MESA_FORMAT_RGBX_FLOAT16:
1514       *datatype = GL_HALF_FLOAT;
1515       *comps = 4;
1516       return;
1517
1518    case MESA_FORMAT_RGBX_FLOAT32:
1519       *datatype = GL_FLOAT;
1520       *comps = 4;
1521       return;
1522
1523    case MESA_FORMAT_RGBX_UINT32:
1524       *datatype = GL_UNSIGNED_INT;
1525       *comps = 4;
1526       return;
1527
1528    case MESA_FORMAT_RGBX_SINT32:
1529       *datatype = GL_INT;
1530       *comps = 4;
1531       return;
1532
1533    case MESA_FORMAT_R10G10B10A2_UNORM:
1534       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1535       *comps = 4;
1536       return;
1537
1538    case MESA_FORMAT_G8R8_SNORM:
1539       *datatype = GL_BYTE;
1540       *comps = 2;
1541       return;
1542
1543    case MESA_FORMAT_G16R16_SNORM:
1544       *datatype = GL_SHORT;
1545       *comps = 2;
1546       return;
1547
1548    case MESA_FORMAT_B8G8R8X8_SRGB:
1549    case MESA_FORMAT_X8R8G8B8_SRGB:
1550       *datatype = GL_UNSIGNED_BYTE;
1551       *comps = 4;
1552       return;
1553
1554    case MESA_FORMAT_COUNT:
1555       assert(0);
1556       return;
1557
1558    case MESA_FORMAT_NONE:
1559    /* For debug builds, warn if any formats are not handled */
1560 #ifdef DEBUG
1561    default:
1562 #endif
1563       _mesa_problem(NULL, "bad format %s in _mesa_format_to_type_and_comps",
1564                     _mesa_get_format_name(format));
1565       *datatype = 0;
1566       *comps = 1;
1567    }
1568 }
1569
1570 /**
1571  * Check if a mesa_format exactly matches a GL format/type combination
1572  * such that we can use memcpy() from one to the other.
1573  * \param mesa_format  a MESA_FORMAT_x value
1574  * \param format  the user-specified image format
1575  * \param type  the user-specified image datatype
1576  * \param swapBytes  typically the current pixel pack/unpack byteswap state
1577  * \return GL_TRUE if the formats match, GL_FALSE otherwise.
1578  */
1579 GLboolean
1580 _mesa_format_matches_format_and_type(mesa_format mesa_format,
1581                                      GLenum format, GLenum type,
1582                                      GLboolean swapBytes)
1583 {
1584    const GLboolean littleEndian = _mesa_little_endian();
1585
1586    /* Note: When reading a GL format/type combination, the format lists channel
1587     * assignments from most significant channel in the type to least
1588     * significant.  A type with _REV indicates that the assignments are
1589     * swapped, so they are listed from least significant to most significant.
1590     *
1591     * For sanity, please keep this switch statement ordered the same as the
1592     * enums in formats.h.
1593     */
1594
1595    switch (mesa_format) {
1596
1597    case MESA_FORMAT_NONE:
1598    case MESA_FORMAT_COUNT:
1599       return GL_FALSE;
1600
1601    case MESA_FORMAT_A8B8G8R8_UNORM:
1602    case MESA_FORMAT_A8B8G8R8_SRGB:
1603       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1604          return GL_TRUE;
1605
1606       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
1607          return GL_TRUE;
1608
1609       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && !littleEndian)
1610          return GL_TRUE;
1611
1612       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV
1613           && !swapBytes)
1614          return GL_TRUE;
1615
1616       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8
1617           && swapBytes)
1618          return GL_TRUE;
1619
1620       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && littleEndian)
1621          return GL_TRUE;
1622
1623       return GL_FALSE;
1624
1625    case MESA_FORMAT_R8G8B8A8_UNORM:
1626    case MESA_FORMAT_R8G8B8A8_SRGB:
1627       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1628           !swapBytes)
1629          return GL_TRUE;
1630
1631       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1632          return GL_TRUE;
1633
1634       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && littleEndian)
1635          return GL_TRUE;
1636
1637       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8 &&
1638           !swapBytes)
1639          return GL_TRUE;
1640
1641       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1642           swapBytes)
1643          return GL_TRUE;
1644
1645       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && !littleEndian)
1646          return GL_TRUE;
1647
1648       return GL_FALSE;
1649
1650    case MESA_FORMAT_B8G8R8A8_UNORM:
1651    case MESA_FORMAT_B8G8R8A8_SRGB:
1652       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1653           !swapBytes)
1654          return GL_TRUE;
1655
1656       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1657          return GL_TRUE;
1658
1659       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && littleEndian)
1660          return GL_TRUE;
1661
1662       return GL_FALSE;
1663
1664    case MESA_FORMAT_A8R8G8B8_UNORM:
1665    case MESA_FORMAT_A8R8G8B8_SRGB:
1666       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1667          return GL_TRUE;
1668
1669       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1670           swapBytes)
1671          return GL_TRUE;
1672
1673       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && !littleEndian)
1674          return GL_TRUE;
1675
1676       return GL_FALSE;
1677
1678    case MESA_FORMAT_X8B8G8R8_UNORM:
1679    case MESA_FORMAT_R8G8B8X8_UNORM:
1680       return GL_FALSE;
1681
1682    case MESA_FORMAT_B8G8R8X8_UNORM:
1683    case MESA_FORMAT_X8R8G8B8_UNORM:
1684       return GL_FALSE;
1685
1686    case MESA_FORMAT_BGR_UNORM8:
1687    case MESA_FORMAT_BGR_SRGB8:
1688       return format == GL_BGR && type == GL_UNSIGNED_BYTE && littleEndian;
1689
1690    case MESA_FORMAT_RGB_UNORM8:
1691       return format == GL_RGB && type == GL_UNSIGNED_BYTE && littleEndian;
1692
1693    case MESA_FORMAT_B5G6R5_UNORM:
1694       return ((format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) ||
1695               (format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1696               !swapBytes;
1697
1698    case MESA_FORMAT_R5G6B5_UNORM:
1699       return ((format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5) ||
1700               (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1701               !swapBytes;
1702
1703    case MESA_FORMAT_B4G4R4A4_UNORM:
1704       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
1705          !swapBytes;
1706
1707    case MESA_FORMAT_A4R4G4B4_UNORM:
1708       return GL_FALSE;
1709
1710    case MESA_FORMAT_A1B5G5R5_UNORM:
1711       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1712          !swapBytes;
1713
1714    case MESA_FORMAT_B5G5R5A1_UNORM:
1715       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
1716          !swapBytes;
1717
1718    case MESA_FORMAT_A1R5G5B5_UNORM:
1719       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1720          !swapBytes;
1721
1722    case MESA_FORMAT_L4A4_UNORM:
1723       return GL_FALSE;
1724    case MESA_FORMAT_L8A8_UNORM:
1725    case MESA_FORMAT_L8A8_SRGB:
1726       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_BYTE && littleEndian;
1727    case MESA_FORMAT_A8L8_UNORM:
1728    case MESA_FORMAT_A8L8_SRGB:
1729       return GL_FALSE;
1730
1731    case MESA_FORMAT_L16A16_UNORM:
1732       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_SHORT && littleEndian && !swapBytes;
1733    case MESA_FORMAT_A16L16_UNORM:
1734       return GL_FALSE;
1735
1736    case MESA_FORMAT_B2G3R3_UNORM:
1737       return format == GL_RGB && type == GL_UNSIGNED_BYTE_3_3_2;
1738
1739    case MESA_FORMAT_R3G3B2_UNORM:
1740       return format == GL_RGB && type == GL_UNSIGNED_BYTE_2_3_3_REV;
1741
1742    case MESA_FORMAT_A4B4G4R4_UNORM:
1743       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1744          return GL_TRUE;
1745
1746       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1747          return GL_TRUE;
1748
1749       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1750          return GL_TRUE;
1751
1752       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1753          return GL_TRUE;
1754
1755       return GL_FALSE;
1756
1757    case MESA_FORMAT_R4G4B4A4_UNORM:
1758       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1759          return GL_TRUE;
1760
1761       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1762          return GL_TRUE;
1763
1764       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1765          return GL_TRUE;
1766
1767       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1768          return GL_TRUE;
1769
1770       return GL_FALSE;
1771
1772    case MESA_FORMAT_R5G5B5A1_UNORM:
1773       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
1774
1775    case MESA_FORMAT_A2B10G10R10_UNORM:
1776       return format == GL_RGBA && type == GL_UNSIGNED_INT_10_10_10_2;
1777
1778    case MESA_FORMAT_A2B10G10R10_UINT:
1779       return format == GL_RGBA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1780
1781    case MESA_FORMAT_A2R10G10B10_UNORM:
1782       return format == GL_BGRA && type == GL_UNSIGNED_INT_10_10_10_2;
1783
1784    case MESA_FORMAT_A2R10G10B10_UINT:
1785       return format == GL_BGRA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1786
1787    case MESA_FORMAT_A_UNORM8:
1788       return format == GL_ALPHA && type == GL_UNSIGNED_BYTE;
1789    case MESA_FORMAT_A_UNORM16:
1790       return format == GL_ALPHA && type == GL_UNSIGNED_SHORT && !swapBytes;
1791    case MESA_FORMAT_L_UNORM8:
1792    case MESA_FORMAT_L_SRGB8:
1793       return format == GL_LUMINANCE && type == GL_UNSIGNED_BYTE;
1794    case MESA_FORMAT_L_UNORM16:
1795       return format == GL_LUMINANCE && type == GL_UNSIGNED_SHORT && !swapBytes;
1796    case MESA_FORMAT_I_UNORM8:
1797       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1798    case MESA_FORMAT_I_UNORM16:
1799       return format == GL_RED && type == GL_UNSIGNED_SHORT && !swapBytes;
1800
1801    case MESA_FORMAT_YCBCR:
1802       return format == GL_YCBCR_MESA &&
1803              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian != swapBytes) ||
1804               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian == swapBytes));
1805    case MESA_FORMAT_YCBCR_REV:
1806       return format == GL_YCBCR_MESA &&
1807              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian == swapBytes) ||
1808               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian != swapBytes));
1809
1810    case MESA_FORMAT_R_UNORM8:
1811       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1812    case MESA_FORMAT_R8G8_UNORM:
1813       return format == GL_RG && type == GL_UNSIGNED_BYTE && littleEndian;
1814    case MESA_FORMAT_G8R8_UNORM:
1815       return GL_FALSE;
1816
1817    case MESA_FORMAT_R_UNORM16:
1818       return format == GL_RED && type == GL_UNSIGNED_SHORT &&
1819          !swapBytes;
1820    case MESA_FORMAT_R16G16_UNORM:
1821       return format == GL_RG && type == GL_UNSIGNED_SHORT && littleEndian &&
1822          !swapBytes;
1823    case MESA_FORMAT_G16R16_UNORM:
1824       return GL_FALSE;
1825
1826    case MESA_FORMAT_B10G10R10A2_UNORM:
1827       return format == GL_BGRA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1828          !swapBytes;
1829
1830    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1831       return format == GL_DEPTH_STENCIL && type == GL_UNSIGNED_INT_24_8 &&
1832          !swapBytes;
1833    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1834    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1835       return GL_FALSE;
1836
1837    case MESA_FORMAT_Z_UNORM16:
1838       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_SHORT &&
1839          !swapBytes;
1840
1841    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1842       return GL_FALSE;
1843
1844    case MESA_FORMAT_Z_UNORM32:
1845       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_INT &&
1846          !swapBytes;
1847
1848    case MESA_FORMAT_S_UINT8:
1849       return format == GL_STENCIL_INDEX && type == GL_UNSIGNED_BYTE;
1850
1851    case MESA_FORMAT_SRGB_DXT1:
1852    case MESA_FORMAT_SRGBA_DXT1:
1853    case MESA_FORMAT_SRGBA_DXT3:
1854    case MESA_FORMAT_SRGBA_DXT5:
1855       return GL_FALSE;
1856
1857    case MESA_FORMAT_RGB_FXT1:
1858    case MESA_FORMAT_RGBA_FXT1:
1859    case MESA_FORMAT_RGB_DXT1:
1860    case MESA_FORMAT_RGBA_DXT1:
1861    case MESA_FORMAT_RGBA_DXT3:
1862    case MESA_FORMAT_RGBA_DXT5:
1863       return GL_FALSE;
1864
1865    case MESA_FORMAT_BPTC_RGBA_UNORM:
1866    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
1867    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
1868    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
1869       return GL_FALSE;
1870
1871    case MESA_FORMAT_RGBA_FLOAT32:
1872       return format == GL_RGBA && type == GL_FLOAT && !swapBytes;
1873    case MESA_FORMAT_RGBA_FLOAT16:
1874       return format == GL_RGBA && type == GL_HALF_FLOAT && !swapBytes;
1875
1876    case MESA_FORMAT_RGB_FLOAT32:
1877       return format == GL_RGB && type == GL_FLOAT && !swapBytes;
1878    case MESA_FORMAT_RGB_FLOAT16:
1879       return format == GL_RGB && type == GL_HALF_FLOAT && !swapBytes;
1880
1881    case MESA_FORMAT_A_FLOAT32:
1882       return format == GL_ALPHA && type == GL_FLOAT && !swapBytes;
1883    case MESA_FORMAT_A_FLOAT16:
1884       return format == GL_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1885
1886    case MESA_FORMAT_L_FLOAT32:
1887       return format == GL_LUMINANCE && type == GL_FLOAT && !swapBytes;
1888    case MESA_FORMAT_L_FLOAT16:
1889       return format == GL_LUMINANCE && type == GL_HALF_FLOAT && !swapBytes;
1890
1891    case MESA_FORMAT_LA_FLOAT32:
1892       return format == GL_LUMINANCE_ALPHA && type == GL_FLOAT && !swapBytes;
1893    case MESA_FORMAT_LA_FLOAT16:
1894       return format == GL_LUMINANCE_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1895
1896    case MESA_FORMAT_I_FLOAT32:
1897       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1898    case MESA_FORMAT_I_FLOAT16:
1899       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1900
1901    case MESA_FORMAT_R_FLOAT32:
1902       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1903    case MESA_FORMAT_R_FLOAT16:
1904       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1905
1906    case MESA_FORMAT_RG_FLOAT32:
1907       return format == GL_RG && type == GL_FLOAT && !swapBytes;
1908    case MESA_FORMAT_RG_FLOAT16:
1909       return format == GL_RG && type == GL_HALF_FLOAT && !swapBytes;
1910
1911    case MESA_FORMAT_A_UINT8:
1912       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_BYTE;
1913    case MESA_FORMAT_A_UINT16:
1914       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_SHORT &&
1915              !swapBytes;
1916    case MESA_FORMAT_A_UINT32:
1917       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_INT &&
1918              !swapBytes;
1919    case MESA_FORMAT_A_SINT8:
1920       return format == GL_ALPHA_INTEGER && type == GL_BYTE;
1921    case MESA_FORMAT_A_SINT16:
1922       return format == GL_ALPHA_INTEGER && type == GL_SHORT && !swapBytes;
1923    case MESA_FORMAT_A_SINT32:
1924       return format == GL_ALPHA_INTEGER && type == GL_INT && !swapBytes;
1925
1926    case MESA_FORMAT_I_UINT8:
1927       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1928    case MESA_FORMAT_I_UINT16:
1929       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1930    case MESA_FORMAT_I_UINT32:
1931       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1932    case MESA_FORMAT_I_SINT8:
1933       return format == GL_RED_INTEGER && type == GL_BYTE;
1934    case MESA_FORMAT_I_SINT16:
1935       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1936    case MESA_FORMAT_I_SINT32:
1937       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1938
1939    case MESA_FORMAT_L_UINT8:
1940       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_BYTE;
1941    case MESA_FORMAT_L_UINT16:
1942       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_SHORT &&
1943              !swapBytes;
1944    case MESA_FORMAT_L_UINT32:
1945       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_INT &&
1946              !swapBytes;
1947    case MESA_FORMAT_L_SINT8:
1948       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_BYTE;
1949    case MESA_FORMAT_L_SINT16:
1950       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_SHORT &&
1951              !swapBytes;
1952    case MESA_FORMAT_L_SINT32:
1953       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_INT && !swapBytes;
1954
1955    case MESA_FORMAT_LA_UINT8:
1956       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1957              type == GL_UNSIGNED_BYTE && !swapBytes;
1958    case MESA_FORMAT_LA_UINT16:
1959       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1960              type == GL_UNSIGNED_SHORT && !swapBytes;
1961    case MESA_FORMAT_LA_UINT32:
1962       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1963              type == GL_UNSIGNED_INT && !swapBytes;
1964    case MESA_FORMAT_LA_SINT8:
1965       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_BYTE &&
1966              !swapBytes;
1967    case MESA_FORMAT_LA_SINT16:
1968       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_SHORT &&
1969              !swapBytes;
1970    case MESA_FORMAT_LA_SINT32:
1971       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_INT &&
1972              !swapBytes;
1973
1974    case MESA_FORMAT_R_SINT8:
1975       return format == GL_RED_INTEGER && type == GL_BYTE;
1976    case MESA_FORMAT_RG_SINT8:
1977       return format == GL_RG_INTEGER && type == GL_BYTE && !swapBytes;
1978    case MESA_FORMAT_RGB_SINT8:
1979       return format == GL_RGB_INTEGER && type == GL_BYTE && !swapBytes;
1980    case MESA_FORMAT_RGBA_SINT8:
1981       return format == GL_RGBA_INTEGER && type == GL_BYTE && !swapBytes;
1982    case MESA_FORMAT_R_SINT16:
1983       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1984    case MESA_FORMAT_RG_SINT16:
1985       return format == GL_RG_INTEGER && type == GL_SHORT && !swapBytes;
1986    case MESA_FORMAT_RGB_SINT16:
1987       return format == GL_RGB_INTEGER && type == GL_SHORT && !swapBytes;
1988    case MESA_FORMAT_RGBA_SINT16:
1989       return format == GL_RGBA_INTEGER && type == GL_SHORT && !swapBytes;
1990    case MESA_FORMAT_R_SINT32:
1991       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1992    case MESA_FORMAT_RG_SINT32:
1993       return format == GL_RG_INTEGER && type == GL_INT && !swapBytes;
1994    case MESA_FORMAT_RGB_SINT32:
1995       return format == GL_RGB_INTEGER && type == GL_INT && !swapBytes;
1996    case MESA_FORMAT_RGBA_SINT32:
1997       return format == GL_RGBA_INTEGER && type == GL_INT && !swapBytes;
1998
1999    case MESA_FORMAT_R_UINT8:
2000       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
2001    case MESA_FORMAT_RG_UINT8:
2002       return format == GL_RG_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
2003    case MESA_FORMAT_RGB_UINT8:
2004       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
2005    case MESA_FORMAT_RGBA_UINT8:
2006       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_BYTE &&
2007              !swapBytes;
2008    case MESA_FORMAT_R_UINT16:
2009       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT &&
2010              !swapBytes;
2011    case MESA_FORMAT_RG_UINT16:
2012       return format == GL_RG_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
2013    case MESA_FORMAT_RGB_UINT16:
2014       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT &&
2015              !swapBytes;
2016    case MESA_FORMAT_RGBA_UINT16:
2017       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT &&
2018              !swapBytes;
2019    case MESA_FORMAT_R_UINT32:
2020       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
2021    case MESA_FORMAT_RG_UINT32:
2022       return format == GL_RG_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
2023    case MESA_FORMAT_RGB_UINT32:
2024       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
2025    case MESA_FORMAT_RGBA_UINT32:
2026       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
2027
2028    case MESA_FORMAT_R_SNORM8:
2029       return format == GL_RED && type == GL_BYTE;
2030    case MESA_FORMAT_R8G8_SNORM:
2031       return format == GL_RG && type == GL_BYTE && littleEndian &&
2032              !swapBytes;
2033    case MESA_FORMAT_X8B8G8R8_SNORM:
2034       return GL_FALSE;
2035
2036    case MESA_FORMAT_A8B8G8R8_SNORM:
2037       if (format == GL_RGBA && type == GL_BYTE && !littleEndian)
2038          return GL_TRUE;
2039
2040       if (format == GL_ABGR_EXT && type == GL_BYTE && littleEndian)
2041          return GL_TRUE;
2042
2043       return GL_FALSE;
2044
2045    case MESA_FORMAT_R8G8B8A8_SNORM:
2046       if (format == GL_RGBA && type == GL_BYTE && littleEndian)
2047          return GL_TRUE;
2048
2049       if (format == GL_ABGR_EXT && type == GL_BYTE && !littleEndian)
2050          return GL_TRUE;
2051
2052       return GL_FALSE;
2053
2054    case MESA_FORMAT_R_SNORM16:
2055       return format == GL_RED && type == GL_SHORT &&
2056              !swapBytes;
2057    case MESA_FORMAT_R16G16_SNORM:
2058       return format == GL_RG && type == GL_SHORT && littleEndian && !swapBytes;
2059    case MESA_FORMAT_RGB_SNORM16:
2060       return format == GL_RGB && type == GL_SHORT && !swapBytes;
2061    case MESA_FORMAT_RGBA_SNORM16:
2062       return format == GL_RGBA && type == GL_SHORT && !swapBytes;
2063    case MESA_FORMAT_RGBA_UNORM16:
2064       return format == GL_RGBA && type == GL_UNSIGNED_SHORT &&
2065              !swapBytes;
2066
2067    case MESA_FORMAT_R_RGTC1_UNORM:
2068    case MESA_FORMAT_R_RGTC1_SNORM:
2069    case MESA_FORMAT_RG_RGTC2_UNORM:
2070    case MESA_FORMAT_RG_RGTC2_SNORM:
2071       return GL_FALSE;
2072
2073    case MESA_FORMAT_L_LATC1_UNORM:
2074    case MESA_FORMAT_L_LATC1_SNORM:
2075    case MESA_FORMAT_LA_LATC2_UNORM:
2076    case MESA_FORMAT_LA_LATC2_SNORM:
2077       return GL_FALSE;
2078
2079    case MESA_FORMAT_ETC1_RGB8:
2080    case MESA_FORMAT_ETC2_RGB8:
2081    case MESA_FORMAT_ETC2_SRGB8:
2082    case MESA_FORMAT_ETC2_RGBA8_EAC:
2083    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
2084    case MESA_FORMAT_ETC2_R11_EAC:
2085    case MESA_FORMAT_ETC2_RG11_EAC:
2086    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
2087    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
2088    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
2089    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
2090       return GL_FALSE;
2091
2092    case MESA_FORMAT_A_SNORM8:
2093       return format == GL_ALPHA && type == GL_BYTE;
2094    case MESA_FORMAT_L_SNORM8:
2095       return format == GL_LUMINANCE && type == GL_BYTE;
2096    case MESA_FORMAT_L8A8_SNORM:
2097       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
2098              littleEndian && !swapBytes;
2099    case MESA_FORMAT_A8L8_SNORM:
2100       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
2101              !littleEndian && !swapBytes;
2102    case MESA_FORMAT_I_SNORM8:
2103       return format == GL_RED && type == GL_BYTE;
2104    case MESA_FORMAT_A_SNORM16:
2105       return format == GL_ALPHA && type == GL_SHORT && !swapBytes;
2106    case MESA_FORMAT_L_SNORM16:
2107       return format == GL_LUMINANCE && type == GL_SHORT && !swapBytes;
2108    case MESA_FORMAT_LA_SNORM16:
2109       return format == GL_LUMINANCE_ALPHA && type == GL_SHORT &&
2110              littleEndian && !swapBytes;
2111    case MESA_FORMAT_I_SNORM16:
2112       return format == GL_RED && type == GL_SHORT && littleEndian &&
2113              !swapBytes;
2114
2115    case MESA_FORMAT_B10G10R10A2_UINT:
2116       return (format == GL_BGRA_INTEGER_EXT &&
2117               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2118               !swapBytes);
2119
2120    case MESA_FORMAT_R10G10B10A2_UINT:
2121       return (format == GL_RGBA_INTEGER_EXT &&
2122               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2123               !swapBytes);
2124
2125    case MESA_FORMAT_R9G9B9E5_FLOAT:
2126       return format == GL_RGB && type == GL_UNSIGNED_INT_5_9_9_9_REV &&
2127          !swapBytes;
2128
2129    case MESA_FORMAT_R11G11B10_FLOAT:
2130       return format == GL_RGB && type == GL_UNSIGNED_INT_10F_11F_11F_REV &&
2131          !swapBytes;
2132
2133    case MESA_FORMAT_Z_FLOAT32:
2134       return format == GL_DEPTH_COMPONENT && type == GL_FLOAT && !swapBytes;
2135
2136    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
2137       return format == GL_DEPTH_STENCIL &&
2138              type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV && !swapBytes;
2139
2140    case MESA_FORMAT_B4G4R4X4_UNORM:
2141    case MESA_FORMAT_B5G5R5X1_UNORM:
2142    case MESA_FORMAT_R8G8B8X8_SNORM:
2143    case MESA_FORMAT_R8G8B8X8_SRGB:
2144    case MESA_FORMAT_X8B8G8R8_SRGB:
2145    case MESA_FORMAT_RGBX_UINT8:
2146    case MESA_FORMAT_RGBX_SINT8:
2147    case MESA_FORMAT_B10G10R10X2_UNORM:
2148    case MESA_FORMAT_R10G10B10X2_UNORM:
2149    case MESA_FORMAT_RGBX_UNORM16:
2150    case MESA_FORMAT_RGBX_SNORM16:
2151    case MESA_FORMAT_RGBX_FLOAT16:
2152    case MESA_FORMAT_RGBX_UINT16:
2153    case MESA_FORMAT_RGBX_SINT16:
2154    case MESA_FORMAT_RGBX_FLOAT32:
2155    case MESA_FORMAT_RGBX_UINT32:
2156    case MESA_FORMAT_RGBX_SINT32:
2157       return GL_FALSE;
2158
2159    case MESA_FORMAT_R10G10B10A2_UNORM:
2160       return format == GL_RGBA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2161          !swapBytes;
2162
2163    case MESA_FORMAT_G8R8_SNORM:
2164       return format == GL_RG && type == GL_BYTE && !littleEndian &&
2165          !swapBytes;
2166
2167    case MESA_FORMAT_G16R16_SNORM:
2168       return format == GL_RG && type == GL_SHORT && !littleEndian &&
2169          !swapBytes;
2170
2171    case MESA_FORMAT_B8G8R8X8_SRGB:
2172    case MESA_FORMAT_X8R8G8B8_SRGB:
2173       return GL_FALSE;
2174    }
2175
2176    return GL_FALSE;
2177 }
2178