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.c"
  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()
 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    for (f = 1; f < MESA_FORMAT_COUNT; ++f) {
 401       info = _mesa_get_format_info(f);
 402       if (!info->ArrayFormat)
 403          continue;
 404
 405       if (_mesa_little_endian()) {
 406          array_format = info->ArrayFormat;
 407       } else {
 408          array_format = _mesa_array_format_flip_channels(info->ArrayFormat);
 409       }
 410
 411       /* This can happen and does for some of the BGR formats.  Let's take
 412        * the first one in the list.
 413        */
 414       if (_mesa_hash_table_search_pre_hashed(format_array_format_table,
 415                                              array_format,
 416                                              (void *)(intptr_t)array_format))
 417          continue;
 418
 419       _mesa_hash_table_insert_pre_hashed(format_array_format_table,
 420                                          array_format,
 421                                          (void *)(intptr_t)array_format,
 422                                          (void *)(intptr_t)f);
 423    }
 424 }
 425
 426 mesa_format
 427 _mesa_format_from_array_format(uint32_t array_format)
 428 {
 429    struct hash_entry *entry;
 430
 431    assert(_mesa_format_is_mesa_array_format(array_format));
 432
 433    call_once(&format_array_format_table_exists, format_array_format_table_init);
 434
 435    entry = _mesa_hash_table_search_pre_hashed(format_array_format_table,
 436                                               array_format,
 437                                               (void *)(intptr_t)array_format);
 438    if (entry)
 439       return (intptr_t)entry->data;
 440    else
 441       return MESA_FORMAT_NONE;
 442 }
 443
 444 /** Is the given format a compressed format? */
 445 GLboolean
 446 _mesa_is_format_compressed(mesa_format format)
 447 {
 448    const struct gl_format_info *info = _mesa_get_format_info(format);
 449    return info->BlockWidth > 1 || info->BlockHeight > 1;
 450 }
 451
 452
 453 /**
 454  * Determine if the given format represents a packed depth/stencil buffer.
 455  */
 456 GLboolean
 457 _mesa_is_format_packed_depth_stencil(mesa_format format)
 458 {
 459    const struct gl_format_info *info = _mesa_get_format_info(format);
 460
 461    return info->BaseFormat == GL_DEPTH_STENCIL;
 462 }
 463
 464
 465 /**
 466  * Is the given format a signed/unsigned integer color format?
 467  */
 468 GLboolean
 469 _mesa_is_format_integer_color(mesa_format format)
 470 {
 471    const struct gl_format_info *info = _mesa_get_format_info(format);
 472    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT) &&
 473       info->BaseFormat != GL_DEPTH_COMPONENT &&
 474       info->BaseFormat != GL_DEPTH_STENCIL &&
 475       info->BaseFormat != GL_STENCIL_INDEX;
 476 }
 477
 478
 479 /**
 480  * Is the given format an unsigned integer format?
 481  */
 482 GLboolean
 483 _mesa_is_format_unsigned(mesa_format format)
 484 {
 485    const struct gl_format_info *info = _mesa_get_format_info(format);
 486    return _mesa_is_type_unsigned(info->DataType);
 487 }
 488
 489
 490 /**
 491  * Does the given format store signed values?
 492  */
 493 GLboolean
 494 _mesa_is_format_signed(mesa_format format)
 495 {
 496    if (format == MESA_FORMAT_R11G11B10_FLOAT ||
 497        format == MESA_FORMAT_R9G9B9E5_FLOAT) {
 498       /* these packed float formats only store unsigned values */
 499       return GL_FALSE;
 500    }
 501    else {
 502       const struct gl_format_info *info = _mesa_get_format_info(format);
 503       return (info->DataType == GL_SIGNED_NORMALIZED ||
 504               info->DataType == GL_INT ||
 505               info->DataType == GL_FLOAT);
 506    }
 507 }
 508
 509 /**
 510  * Is the given format an integer format?
 511  */
 512 GLboolean
 513 _mesa_is_format_integer(mesa_format format)
 514 {
 515    const struct gl_format_info *info = _mesa_get_format_info(format);
 516    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT);
 517 }
 518
 519
 520 /**
 521  * Return true if the given format is a color format.
 522  */
 523 GLenum
 524 _mesa_is_format_color_format(mesa_format format)
 525 {
 526    const struct gl_format_info *info = _mesa_get_format_info(format);
 527    switch (info->BaseFormat) {
 528    case GL_DEPTH_COMPONENT:
 529    case GL_STENCIL_INDEX:
 530    case GL_DEPTH_STENCIL:
 531       return false;
 532    default:
 533       return true;
 534    }
 535 }
 536
 537
 538 /**
 539  * Return color encoding for given format.
 540  * \return GL_LINEAR or GL_SRGB
 541  */
 542 GLenum
 543 _mesa_get_format_color_encoding(mesa_format format)
 544 {
 545    /* XXX this info should be encoded in gl_format_info */
 546    switch (format) {
 547    case MESA_FORMAT_BGR_SRGB8:
 548    case MESA_FORMAT_A8B8G8R8_SRGB:
 549    case MESA_FORMAT_B8G8R8A8_SRGB:
 550    case MESA_FORMAT_A8R8G8B8_SRGB:
 551    case MESA_FORMAT_R8G8B8A8_SRGB:
 552    case MESA_FORMAT_L_SRGB8:
 553    case MESA_FORMAT_L8A8_SRGB:
 554    case MESA_FORMAT_A8L8_SRGB:
 555    case MESA_FORMAT_SRGB_DXT1:
 556    case MESA_FORMAT_SRGBA_DXT1:
 557    case MESA_FORMAT_SRGBA_DXT3:
 558    case MESA_FORMAT_SRGBA_DXT5:
 559    case MESA_FORMAT_R8G8B8X8_SRGB:
 560    case MESA_FORMAT_ETC2_SRGB8:
 561    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 562    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 563    case MESA_FORMAT_B8G8R8X8_SRGB:
 564    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 565       return GL_SRGB;
 566    default:
 567       return GL_LINEAR;
 568    }
 569 }
 570
 571
 572 /**
 573  * Return TRUE if format is an ETC2 compressed format specified
 574  * by GL_ARB_ES3_compatibility.
 575  */
 576 bool
 577 _mesa_is_format_etc2(mesa_format format)
 578 {
 579    switch (format) {
 580    case MESA_FORMAT_ETC2_RGB8:
 581    case MESA_FORMAT_ETC2_SRGB8:
 582    case MESA_FORMAT_ETC2_RGBA8_EAC:
 583    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 584    case MESA_FORMAT_ETC2_R11_EAC:
 585    case MESA_FORMAT_ETC2_RG11_EAC:
 586    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 587    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 588    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 589    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 590       return GL_TRUE;
 591    default:
 592       return GL_FALSE;
 593    }
 594 }
 595
 596
 597 /**
 598  * For an sRGB format, return the corresponding linear color space format.
 599  * For non-sRGB formats, return the format as-is.
 600  */
 601 mesa_format
 602 _mesa_get_srgb_format_linear(mesa_format format)
 603 {
 604    switch (format) {
 605    case MESA_FORMAT_BGR_SRGB8:
 606       format = MESA_FORMAT_BGR_UNORM8;
 607       break;
 608    case MESA_FORMAT_A8B8G8R8_SRGB:
 609       format = MESA_FORMAT_A8B8G8R8_UNORM;
 610       break;
 611    case MESA_FORMAT_B8G8R8A8_SRGB:
 612       format = MESA_FORMAT_B8G8R8A8_UNORM;
 613       break;
 614    case MESA_FORMAT_A8R8G8B8_SRGB:
 615       format = MESA_FORMAT_A8R8G8B8_UNORM;
 616       break;
 617    case MESA_FORMAT_R8G8B8A8_SRGB:
 618       format = MESA_FORMAT_R8G8B8A8_UNORM;
 619       break;
 620    case MESA_FORMAT_L_SRGB8:
 621       format = MESA_FORMAT_L_UNORM8;
 622       break;
 623    case MESA_FORMAT_L8A8_SRGB:
 624       format = MESA_FORMAT_L8A8_UNORM;
 625       break;
 626    case MESA_FORMAT_A8L8_SRGB:
 627       format = MESA_FORMAT_A8L8_UNORM;
 628       break;
 629    case MESA_FORMAT_SRGB_DXT1:
 630       format = MESA_FORMAT_RGB_DXT1;
 631       break;
 632    case MESA_FORMAT_SRGBA_DXT1:
 633       format = MESA_FORMAT_RGBA_DXT1;
 634       break;
 635    case MESA_FORMAT_SRGBA_DXT3:
 636       format = MESA_FORMAT_RGBA_DXT3;
 637       break;
 638    case MESA_FORMAT_SRGBA_DXT5:
 639       format = MESA_FORMAT_RGBA_DXT5;
 640       break;
 641    case MESA_FORMAT_R8G8B8X8_SRGB:
 642       format = MESA_FORMAT_R8G8B8X8_UNORM;
 643       break;
 644    case MESA_FORMAT_X8B8G8R8_SRGB:
 645       format = MESA_FORMAT_X8B8G8R8_UNORM;
 646       break;
 647    case MESA_FORMAT_ETC2_SRGB8:
 648       format = MESA_FORMAT_ETC2_RGB8;
 649       break;
 650    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 651       format = MESA_FORMAT_ETC2_RGBA8_EAC;
 652       break;
 653    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 654       format = MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1;
 655       break;
 656    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 657       format = MESA_FORMAT_BPTC_RGBA_UNORM;
 658       break;
 659    case MESA_FORMAT_B8G8R8X8_SRGB:
 660       format = MESA_FORMAT_B8G8R8X8_UNORM;
 661       break;
 662    case MESA_FORMAT_X8R8G8B8_SRGB:
 663       format = MESA_FORMAT_X8R8G8B8_UNORM;
 664       break;
 665    default:
 666       break;
 667    }
 668    return format;
 669 }
 670
 671
 672 /**
 673  * If the given format is a compressed format, return a corresponding
 674  * uncompressed format.
 675  */
 676 mesa_format
 677 _mesa_get_uncompressed_format(mesa_format format)
 678 {
 679    switch (format) {
 680    case MESA_FORMAT_RGB_FXT1:
 681       return MESA_FORMAT_BGR_UNORM8;
 682    case MESA_FORMAT_RGBA_FXT1:
 683       return MESA_FORMAT_A8B8G8R8_UNORM;
 684    case MESA_FORMAT_RGB_DXT1:
 685    case MESA_FORMAT_SRGB_DXT1:
 686       return MESA_FORMAT_BGR_UNORM8;
 687    case MESA_FORMAT_RGBA_DXT1:
 688    case MESA_FORMAT_SRGBA_DXT1:
 689       return MESA_FORMAT_A8B8G8R8_UNORM;
 690    case MESA_FORMAT_RGBA_DXT3:
 691    case MESA_FORMAT_SRGBA_DXT3:
 692       return MESA_FORMAT_A8B8G8R8_UNORM;
 693    case MESA_FORMAT_RGBA_DXT5:
 694    case MESA_FORMAT_SRGBA_DXT5:
 695       return MESA_FORMAT_A8B8G8R8_UNORM;
 696    case MESA_FORMAT_R_RGTC1_UNORM:
 697       return MESA_FORMAT_R_UNORM8;
 698    case MESA_FORMAT_R_RGTC1_SNORM:
 699       return MESA_FORMAT_R_SNORM8;
 700    case MESA_FORMAT_RG_RGTC2_UNORM:
 701       return MESA_FORMAT_R8G8_UNORM;
 702    case MESA_FORMAT_RG_RGTC2_SNORM:
 703       return MESA_FORMAT_R8G8_SNORM;
 704    case MESA_FORMAT_L_LATC1_UNORM:
 705       return MESA_FORMAT_L_UNORM8;
 706    case MESA_FORMAT_L_LATC1_SNORM:
 707       return MESA_FORMAT_L_SNORM8;
 708    case MESA_FORMAT_LA_LATC2_UNORM:
 709       return MESA_FORMAT_L8A8_UNORM;
 710    case MESA_FORMAT_LA_LATC2_SNORM:
 711       return MESA_FORMAT_L8A8_SNORM;
 712    case MESA_FORMAT_ETC1_RGB8:
 713    case MESA_FORMAT_ETC2_RGB8:
 714    case MESA_FORMAT_ETC2_SRGB8:
 715       return MESA_FORMAT_BGR_UNORM8;
 716    case MESA_FORMAT_ETC2_RGBA8_EAC:
 717    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 718    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 719    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 720       return MESA_FORMAT_A8B8G8R8_UNORM;
 721    case MESA_FORMAT_ETC2_R11_EAC:
 722    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 723       return MESA_FORMAT_R_UNORM16;
 724    case MESA_FORMAT_ETC2_RG11_EAC:
 725    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 726       return MESA_FORMAT_R16G16_UNORM;
 727    case MESA_FORMAT_BPTC_RGBA_UNORM:
 728    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 729       return MESA_FORMAT_A8B8G8R8_UNORM;
 730    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
 731    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
 732       return MESA_FORMAT_RGB_FLOAT32;
 733    default:
 734 #ifdef DEBUG
 735       assert(!_mesa_is_format_compressed(format));
 736 #endif
 737       return format;
 738    }
 739 }
 740
 741
 742 GLuint
 743 _mesa_format_num_components(mesa_format format)
 744 {
 745    const struct gl_format_info *info = _mesa_get_format_info(format);
 746    return ((info->RedBits > 0) +
 747            (info->GreenBits > 0) +
 748            (info->BlueBits > 0) +
 749            (info->AlphaBits > 0) +
 750            (info->LuminanceBits > 0) +
 751            (info->IntensityBits > 0) +
 752            (info->DepthBits > 0) +
 753            (info->StencilBits > 0));
 754 }
 755
 756
 757 /**
 758  * Returns true if a color format has data stored in the R/G/B/A channels,
 759  * given an index from 0 to 3.
 760  */
 761 bool
 762 _mesa_format_has_color_component(mesa_format format, int component)
 763 {
 764    const struct gl_format_info *info = _mesa_get_format_info(format);
 765
 766    assert(info->BaseFormat != GL_DEPTH_COMPONENT &&
 767           info->BaseFormat != GL_DEPTH_STENCIL &&
 768           info->BaseFormat != GL_STENCIL_INDEX);
 769
 770    switch (component) {
 771    case 0:
 772       return (info->RedBits + info->IntensityBits + info->LuminanceBits) > 0;
 773    case 1:
 774       return (info->GreenBits + info->IntensityBits + info->LuminanceBits) > 0;
 775    case 2:
 776       return (info->BlueBits + info->IntensityBits + info->LuminanceBits) > 0;
 777    case 3:
 778       return (info->AlphaBits + info->IntensityBits) > 0;
 779    default:
 780       assert(!"Invalid color component: must be 0..3");
 781       return false;
 782    }
 783 }
 784
 785
 786 /**
 787  * Return number of bytes needed to store an image of the given size
 788  * in the given format.
 789  */
 790 GLuint
 791 _mesa_format_image_size(mesa_format format, GLsizei width,
 792                         GLsizei height, GLsizei depth)
 793 {
 794    const struct gl_format_info *info = _mesa_get_format_info(format);
 795    /* Strictly speaking, a conditional isn't needed here */
 796    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 797       /* compressed format (2D only for now) */
 798       const GLuint bw = info->BlockWidth, bh = info->BlockHeight;
 799       const GLuint wblocks = (width + bw - 1) / bw;
 800       const GLuint hblocks = (height + bh - 1) / bh;
 801       const GLuint sz = wblocks * hblocks * info->BytesPerBlock;
 802       return sz * depth;
 803    }
 804    else {
 805       /* non-compressed */
 806       const GLuint sz = width * height * depth * info->BytesPerBlock;
 807       return sz;
 808    }
 809 }
 810
 811
 812 /**
 813  * Same as _mesa_format_image_size() but returns a 64-bit value to
 814  * accomodate very large textures.
 815  */
 816 uint64_t
 817 _mesa_format_image_size64(mesa_format format, GLsizei width,
 818                           GLsizei height, GLsizei depth)
 819 {
 820    const struct gl_format_info *info = _mesa_get_format_info(format);
 821    /* Strictly speaking, a conditional isn't needed here */
 822    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 823       /* compressed format (2D only for now) */
 824       const uint64_t bw = info->BlockWidth, bh = info->BlockHeight;
 825       const uint64_t wblocks = (width + bw - 1) / bw;
 826       const uint64_t hblocks = (height + bh - 1) / bh;
 827       const uint64_t sz = wblocks * hblocks * info->BytesPerBlock;
 828       return sz * depth;
 829    }
 830    else {
 831       /* non-compressed */
 832       const uint64_t sz = ((uint64_t) width *
 833                            (uint64_t) height *
 834                            (uint64_t) depth *
 835                            info->BytesPerBlock);
 836       return sz;
 837    }
 838 }
 839
 840
 841
 842 GLint
 843 _mesa_format_row_stride(mesa_format format, GLsizei width)
 844 {
 845    const struct gl_format_info *info = _mesa_get_format_info(format);
 846    /* Strictly speaking, a conditional isn't needed here */
 847    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 848       /* compressed format */
 849       const GLuint bw = info->BlockWidth;
 850       const GLuint wblocks = (width + bw - 1) / bw;
 851       const GLint stride = wblocks * info->BytesPerBlock;
 852       return stride;
 853    }
 854    else {
 855       const GLint stride = width * info->BytesPerBlock;
 856       return stride;
 857    }
 858 }
 859
 860
 861 /**
 862  * Debug/test: check that all formats are handled in the
 863  * _mesa_format_to_type_and_comps() function.  When new pixel formats
 864  * are added to Mesa, that function needs to be updated.
 865  * This is a no-op after the first call.
 866  */
 867 static void
 868 check_format_to_type_and_comps(void)
 869 {
 870    mesa_format f;
 871
 872    for (f = MESA_FORMAT_NONE + 1; f < MESA_FORMAT_COUNT; f++) {
 873       GLenum datatype = 0;
 874       GLuint comps = 0;
 875       /* This function will emit a problem/warning if the format is
 876        * not handled.
 877        */
 878       _mesa_format_to_type_and_comps(f, &datatype, &comps);
 879    }
 880 }
 881
 882 /**
 883  * Do sanity checking of the format info table.
 884  */
 885 void
 886 _mesa_test_formats(void)
 887 {
 888    GLuint i;
 889
 890    STATIC_ASSERT(Elements(format_info) == MESA_FORMAT_COUNT);
 891
 892    for (i = 0; i < MESA_FORMAT_COUNT; i++) {
 893       const struct gl_format_info *info = _mesa_get_format_info(i);
 894       assert(info);
 895
 896       assert(info->Name == i);
 897
 898       if (info->Name == MESA_FORMAT_NONE)
 899          continue;
 900
 901       if (info->BlockWidth == 1 && info->BlockHeight == 1) {
 902          if (info->RedBits > 0) {
 903             GLuint t = info->RedBits + info->GreenBits
 904                + info->BlueBits + info->AlphaBits;
 905             assert(t / 8 <= info->BytesPerBlock);
 906             (void) t;
 907          }
 908       }
 909
 910       assert(info->DataType == GL_UNSIGNED_NORMALIZED ||
 911              info->DataType == GL_SIGNED_NORMALIZED ||
 912              info->DataType == GL_UNSIGNED_INT ||
 913              info->DataType == GL_INT ||
 914              info->DataType == GL_FLOAT ||
 915              /* Z32_FLOAT_X24S8 has DataType of GL_NONE */
 916              info->DataType == GL_NONE);
 917
 918       if (info->BaseFormat == GL_RGB) {
 919          assert(info->RedBits > 0);
 920          assert(info->GreenBits > 0);
 921          assert(info->BlueBits > 0);
 922          assert(info->AlphaBits == 0);
 923          assert(info->LuminanceBits == 0);
 924          assert(info->IntensityBits == 0);
 925       }
 926       else if (info->BaseFormat == GL_RGBA) {
 927          assert(info->RedBits > 0);
 928          assert(info->GreenBits > 0);
 929          assert(info->BlueBits > 0);
 930          assert(info->AlphaBits > 0);
 931          assert(info->LuminanceBits == 0);
 932          assert(info->IntensityBits == 0);
 933       }
 934       else if (info->BaseFormat == GL_RG) {
 935          assert(info->RedBits > 0);
 936          assert(info->GreenBits > 0);
 937          assert(info->BlueBits == 0);
 938          assert(info->AlphaBits == 0);
 939          assert(info->LuminanceBits == 0);
 940          assert(info->IntensityBits == 0);
 941       }
 942       else if (info->BaseFormat == GL_RED) {
 943          assert(info->RedBits > 0);
 944          assert(info->GreenBits == 0);
 945          assert(info->BlueBits == 0);
 946          assert(info->AlphaBits == 0);
 947          assert(info->LuminanceBits == 0);
 948          assert(info->IntensityBits == 0);
 949       }
 950       else if (info->BaseFormat == GL_LUMINANCE) {
 951          assert(info->RedBits == 0);
 952          assert(info->GreenBits == 0);
 953          assert(info->BlueBits == 0);
 954          assert(info->AlphaBits == 0);
 955          assert(info->LuminanceBits > 0);
 956          assert(info->IntensityBits == 0);
 957       }
 958       else if (info->BaseFormat == GL_INTENSITY) {
 959          assert(info->RedBits == 0);
 960          assert(info->GreenBits == 0);
 961          assert(info->BlueBits == 0);
 962          assert(info->AlphaBits == 0);
 963          assert(info->LuminanceBits == 0);
 964          assert(info->IntensityBits > 0);
 965       }
 966    }
 967
 968    check_format_to_type_and_comps();
 969 }
 970
 971
 972
 973 /**
 974  * Return datatype and number of components per texel for the given mesa_format.
 975  * Only used for mipmap generation code.
 976  */
 977 void
 978 _mesa_format_to_type_and_comps(mesa_format format,
 979                                GLenum *datatype, GLuint *comps)
 980 {
 981    switch (format) {
 982    case MESA_FORMAT_A8B8G8R8_UNORM:
 983    case MESA_FORMAT_R8G8B8A8_UNORM:
 984    case MESA_FORMAT_B8G8R8A8_UNORM:
 985    case MESA_FORMAT_A8R8G8B8_UNORM:
 986    case MESA_FORMAT_X8B8G8R8_UNORM:
 987    case MESA_FORMAT_R8G8B8X8_UNORM:
 988    case MESA_FORMAT_B8G8R8X8_UNORM:
 989    case MESA_FORMAT_X8R8G8B8_UNORM:
 990       *datatype = GL_UNSIGNED_BYTE;
 991       *comps = 4;
 992       return;
 993    case MESA_FORMAT_BGR_UNORM8:
 994    case MESA_FORMAT_RGB_UNORM8:
 995       *datatype = GL_UNSIGNED_BYTE;
 996       *comps = 3;
 997       return;
 998    case MESA_FORMAT_B5G6R5_UNORM:
 999    case MESA_FORMAT_R5G6B5_UNORM:
1000       *datatype = GL_UNSIGNED_SHORT_5_6_5;
1001       *comps = 3;
1002       return;
1003
1004    case MESA_FORMAT_B4G4R4A4_UNORM:
1005    case MESA_FORMAT_A4R4G4B4_UNORM:
1006    case MESA_FORMAT_B4G4R4X4_UNORM:
1007       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
1008       *comps = 4;
1009       return;
1010
1011    case MESA_FORMAT_B5G5R5A1_UNORM:
1012    case MESA_FORMAT_A1R5G5B5_UNORM:
1013    case MESA_FORMAT_B5G5R5X1_UNORM:
1014       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
1015       *comps = 4;
1016       return;
1017
1018    case MESA_FORMAT_B10G10R10A2_UNORM:
1019       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1020       *comps = 4;
1021       return;
1022
1023    case MESA_FORMAT_A1B5G5R5_UNORM:
1024       *datatype = GL_UNSIGNED_SHORT_5_5_5_1;
1025       *comps = 4;
1026       return;
1027
1028    case MESA_FORMAT_L4A4_UNORM:
1029       *datatype = MESA_UNSIGNED_BYTE_4_4;
1030       *comps = 2;
1031       return;
1032
1033    case MESA_FORMAT_L8A8_UNORM:
1034    case MESA_FORMAT_A8L8_UNORM:
1035    case MESA_FORMAT_R8G8_UNORM:
1036    case MESA_FORMAT_G8R8_UNORM:
1037       *datatype = GL_UNSIGNED_BYTE;
1038       *comps = 2;
1039       return;
1040
1041    case MESA_FORMAT_L16A16_UNORM:
1042    case MESA_FORMAT_A16L16_UNORM:
1043    case MESA_FORMAT_R16G16_UNORM:
1044    case MESA_FORMAT_G16R16_UNORM:
1045       *datatype = GL_UNSIGNED_SHORT;
1046       *comps = 2;
1047       return;
1048
1049    case MESA_FORMAT_R_UNORM16:
1050    case MESA_FORMAT_A_UNORM16:
1051    case MESA_FORMAT_L_UNORM16:
1052    case MESA_FORMAT_I_UNORM16:
1053       *datatype = GL_UNSIGNED_SHORT;
1054       *comps = 1;
1055       return;
1056
1057    case MESA_FORMAT_R3G3B2_UNORM:
1058       *datatype = GL_UNSIGNED_BYTE_2_3_3_REV;
1059       *comps = 3;
1060       return;
1061    case MESA_FORMAT_A4B4G4R4_UNORM:
1062       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
1063       *comps = 4;
1064       return;
1065
1066    case MESA_FORMAT_R4G4B4A4_UNORM:
1067       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
1068       *comps = 4;
1069       return;
1070    case MESA_FORMAT_R5G5B5A1_UNORM:
1071       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
1072       *comps = 4;
1073       return;
1074    case MESA_FORMAT_A2B10G10R10_UNORM:
1075    case MESA_FORMAT_A2B10G10R10_UINT:
1076       *datatype = GL_UNSIGNED_INT_10_10_10_2;
1077       *comps = 4;
1078       return;
1079    case MESA_FORMAT_A2R10G10B10_UNORM:
1080    case MESA_FORMAT_A2R10G10B10_UINT:
1081       *datatype = GL_UNSIGNED_INT_10_10_10_2;
1082       *comps = 4;
1083       return;
1084
1085    case MESA_FORMAT_B2G3R3_UNORM:
1086       *datatype = GL_UNSIGNED_BYTE_3_3_2;
1087       *comps = 3;
1088       return;
1089
1090    case MESA_FORMAT_A_UNORM8:
1091    case MESA_FORMAT_L_UNORM8:
1092    case MESA_FORMAT_I_UNORM8:
1093    case MESA_FORMAT_R_UNORM8:
1094    case MESA_FORMAT_S_UINT8:
1095       *datatype = GL_UNSIGNED_BYTE;
1096       *comps = 1;
1097       return;
1098
1099    case MESA_FORMAT_YCBCR:
1100    case MESA_FORMAT_YCBCR_REV:
1101       *datatype = GL_UNSIGNED_SHORT;
1102       *comps = 2;
1103       return;
1104
1105    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1106       *datatype = GL_UNSIGNED_INT_24_8_MESA;
1107       *comps = 2;
1108       return;
1109
1110    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1111       *datatype = GL_UNSIGNED_INT_8_24_REV_MESA;
1112       *comps = 2;
1113       return;
1114
1115    case MESA_FORMAT_Z_UNORM16:
1116       *datatype = GL_UNSIGNED_SHORT;
1117       *comps = 1;
1118       return;
1119
1120    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1121       *datatype = GL_UNSIGNED_INT;
1122       *comps = 1;
1123       return;
1124
1125    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1126       *datatype = GL_UNSIGNED_INT;
1127       *comps = 1;
1128       return;
1129
1130    case MESA_FORMAT_Z_UNORM32:
1131       *datatype = GL_UNSIGNED_INT;
1132       *comps = 1;
1133       return;
1134
1135    case MESA_FORMAT_Z_FLOAT32:
1136       *datatype = GL_FLOAT;
1137       *comps = 1;
1138       return;
1139
1140    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
1141       *datatype = GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
1142       *comps = 1;
1143       return;
1144
1145    case MESA_FORMAT_R_SNORM8:
1146    case MESA_FORMAT_A_SNORM8:
1147    case MESA_FORMAT_L_SNORM8:
1148    case MESA_FORMAT_I_SNORM8:
1149       *datatype = GL_BYTE;
1150       *comps = 1;
1151       return;
1152    case MESA_FORMAT_R8G8_SNORM:
1153    case MESA_FORMAT_L8A8_SNORM:
1154    case MESA_FORMAT_A8L8_SNORM:
1155       *datatype = GL_BYTE;
1156       *comps = 2;
1157       return;
1158    case MESA_FORMAT_A8B8G8R8_SNORM:
1159    case MESA_FORMAT_R8G8B8A8_SNORM:
1160    case MESA_FORMAT_X8B8G8R8_SNORM:
1161       *datatype = GL_BYTE;
1162       *comps = 4;
1163       return;
1164
1165    case MESA_FORMAT_RGBA_UNORM16:
1166       *datatype = GL_UNSIGNED_SHORT;
1167       *comps = 4;
1168       return;
1169
1170    case MESA_FORMAT_R_SNORM16:
1171    case MESA_FORMAT_A_SNORM16:
1172    case MESA_FORMAT_L_SNORM16:
1173    case MESA_FORMAT_I_SNORM16:
1174       *datatype = GL_SHORT;
1175       *comps = 1;
1176       return;
1177    case MESA_FORMAT_R16G16_SNORM:
1178    case MESA_FORMAT_LA_SNORM16:
1179       *datatype = GL_SHORT;
1180       *comps = 2;
1181       return;
1182    case MESA_FORMAT_RGB_SNORM16:
1183       *datatype = GL_SHORT;
1184       *comps = 3;
1185       return;
1186    case MESA_FORMAT_RGBA_SNORM16:
1187       *datatype = GL_SHORT;
1188       *comps = 4;
1189       return;
1190
1191    case MESA_FORMAT_BGR_SRGB8:
1192       *datatype = GL_UNSIGNED_BYTE;
1193       *comps = 3;
1194       return;
1195    case MESA_FORMAT_A8B8G8R8_SRGB:
1196    case MESA_FORMAT_B8G8R8A8_SRGB:
1197    case MESA_FORMAT_A8R8G8B8_SRGB:
1198    case MESA_FORMAT_R8G8B8A8_SRGB:
1199       *datatype = GL_UNSIGNED_BYTE;
1200       *comps = 4;
1201       return;
1202    case MESA_FORMAT_L_SRGB8:
1203       *datatype = GL_UNSIGNED_BYTE;
1204       *comps = 1;
1205       return;
1206    case MESA_FORMAT_L8A8_SRGB:
1207    case MESA_FORMAT_A8L8_SRGB:
1208       *datatype = GL_UNSIGNED_BYTE;
1209       *comps = 2;
1210       return;
1211
1212    case MESA_FORMAT_RGB_FXT1:
1213    case MESA_FORMAT_RGBA_FXT1:
1214    case MESA_FORMAT_RGB_DXT1:
1215    case MESA_FORMAT_RGBA_DXT1:
1216    case MESA_FORMAT_RGBA_DXT3:
1217    case MESA_FORMAT_RGBA_DXT5:
1218    case MESA_FORMAT_SRGB_DXT1:
1219    case MESA_FORMAT_SRGBA_DXT1:
1220    case MESA_FORMAT_SRGBA_DXT3:
1221    case MESA_FORMAT_SRGBA_DXT5:
1222    case MESA_FORMAT_R_RGTC1_UNORM:
1223    case MESA_FORMAT_R_RGTC1_SNORM:
1224    case MESA_FORMAT_RG_RGTC2_UNORM:
1225    case MESA_FORMAT_RG_RGTC2_SNORM:
1226    case MESA_FORMAT_L_LATC1_UNORM:
1227    case MESA_FORMAT_L_LATC1_SNORM:
1228    case MESA_FORMAT_LA_LATC2_UNORM:
1229    case MESA_FORMAT_LA_LATC2_SNORM:
1230    case MESA_FORMAT_ETC1_RGB8:
1231    case MESA_FORMAT_ETC2_RGB8:
1232    case MESA_FORMAT_ETC2_SRGB8:
1233    case MESA_FORMAT_ETC2_RGBA8_EAC:
1234    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
1235    case MESA_FORMAT_ETC2_R11_EAC:
1236    case MESA_FORMAT_ETC2_RG11_EAC:
1237    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
1238    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
1239    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
1240    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
1241    case MESA_FORMAT_BPTC_RGBA_UNORM:
1242    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
1243    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
1244    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
1245       /* XXX generate error instead? */
1246       *datatype = GL_UNSIGNED_BYTE;
1247       *comps = 0;
1248       return;
1249
1250    case MESA_FORMAT_RGBA_FLOAT32:
1251       *datatype = GL_FLOAT;
1252       *comps = 4;
1253       return;
1254    case MESA_FORMAT_RGBA_FLOAT16:
1255       *datatype = GL_HALF_FLOAT_ARB;
1256       *comps = 4;
1257       return;
1258    case MESA_FORMAT_RGB_FLOAT32:
1259       *datatype = GL_FLOAT;
1260       *comps = 3;
1261       return;
1262    case MESA_FORMAT_RGB_FLOAT16:
1263       *datatype = GL_HALF_FLOAT_ARB;
1264       *comps = 3;
1265       return;
1266    case MESA_FORMAT_LA_FLOAT32:
1267    case MESA_FORMAT_RG_FLOAT32:
1268       *datatype = GL_FLOAT;
1269       *comps = 2;
1270       return;
1271    case MESA_FORMAT_LA_FLOAT16:
1272    case MESA_FORMAT_RG_FLOAT16:
1273       *datatype = GL_HALF_FLOAT_ARB;
1274       *comps = 2;
1275       return;
1276    case MESA_FORMAT_A_FLOAT32:
1277    case MESA_FORMAT_L_FLOAT32:
1278    case MESA_FORMAT_I_FLOAT32:
1279    case MESA_FORMAT_R_FLOAT32:
1280       *datatype = GL_FLOAT;
1281       *comps = 1;
1282       return;
1283    case MESA_FORMAT_A_FLOAT16:
1284    case MESA_FORMAT_L_FLOAT16:
1285    case MESA_FORMAT_I_FLOAT16:
1286    case MESA_FORMAT_R_FLOAT16:
1287       *datatype = GL_HALF_FLOAT_ARB;
1288       *comps = 1;
1289       return;
1290
1291    case MESA_FORMAT_A_UINT8:
1292    case MESA_FORMAT_L_UINT8:
1293    case MESA_FORMAT_I_UINT8:
1294       *datatype = GL_UNSIGNED_BYTE;
1295       *comps = 1;
1296       return;
1297    case MESA_FORMAT_LA_UINT8:
1298       *datatype = GL_UNSIGNED_BYTE;
1299       *comps = 2;
1300       return;
1301
1302    case MESA_FORMAT_A_UINT16:
1303    case MESA_FORMAT_L_UINT16:
1304    case MESA_FORMAT_I_UINT16:
1305       *datatype = GL_UNSIGNED_SHORT;
1306       *comps = 1;
1307       return;
1308    case MESA_FORMAT_LA_UINT16:
1309       *datatype = GL_UNSIGNED_SHORT;
1310       *comps = 2;
1311       return;
1312    case MESA_FORMAT_A_UINT32:
1313    case MESA_FORMAT_L_UINT32:
1314    case MESA_FORMAT_I_UINT32:
1315       *datatype = GL_UNSIGNED_INT;
1316       *comps = 1;
1317       return;
1318    case MESA_FORMAT_LA_UINT32:
1319       *datatype = GL_UNSIGNED_INT;
1320       *comps = 2;
1321       return;
1322    case MESA_FORMAT_A_SINT8:
1323    case MESA_FORMAT_L_SINT8:
1324    case MESA_FORMAT_I_SINT8:
1325       *datatype = GL_BYTE;
1326       *comps = 1;
1327       return;
1328    case MESA_FORMAT_LA_SINT8:
1329       *datatype = GL_BYTE;
1330       *comps = 2;
1331       return;
1332
1333    case MESA_FORMAT_A_SINT16:
1334    case MESA_FORMAT_L_SINT16:
1335    case MESA_FORMAT_I_SINT16:
1336       *datatype = GL_SHORT;
1337       *comps = 1;
1338       return;
1339    case MESA_FORMAT_LA_SINT16:
1340       *datatype = GL_SHORT;
1341       *comps = 2;
1342       return;
1343
1344    case MESA_FORMAT_A_SINT32:
1345    case MESA_FORMAT_L_SINT32:
1346    case MESA_FORMAT_I_SINT32:
1347       *datatype = GL_INT;
1348       *comps = 1;
1349       return;
1350    case MESA_FORMAT_LA_SINT32:
1351       *datatype = GL_INT;
1352       *comps = 2;
1353       return;
1354
1355    case MESA_FORMAT_R_SINT8:
1356       *datatype = GL_BYTE;
1357       *comps = 1;
1358       return;
1359    case MESA_FORMAT_RG_SINT8:
1360       *datatype = GL_BYTE;
1361       *comps = 2;
1362       return;
1363    case MESA_FORMAT_RGB_SINT8:
1364       *datatype = GL_BYTE;
1365       *comps = 3;
1366       return;
1367    case MESA_FORMAT_RGBA_SINT8:
1368       *datatype = GL_BYTE;
1369       *comps = 4;
1370       return;
1371    case MESA_FORMAT_R_SINT16:
1372       *datatype = GL_SHORT;
1373       *comps = 1;
1374       return;
1375    case MESA_FORMAT_RG_SINT16:
1376       *datatype = GL_SHORT;
1377       *comps = 2;
1378       return;
1379    case MESA_FORMAT_RGB_SINT16:
1380       *datatype = GL_SHORT;
1381       *comps = 3;
1382       return;
1383    case MESA_FORMAT_RGBA_SINT16:
1384       *datatype = GL_SHORT;
1385       *comps = 4;
1386       return;
1387    case MESA_FORMAT_R_SINT32:
1388       *datatype = GL_INT;
1389       *comps = 1;
1390       return;
1391    case MESA_FORMAT_RG_SINT32:
1392       *datatype = GL_INT;
1393       *comps = 2;
1394       return;
1395    case MESA_FORMAT_RGB_SINT32:
1396       *datatype = GL_INT;
1397       *comps = 3;
1398       return;
1399    case MESA_FORMAT_RGBA_SINT32:
1400       *datatype = GL_INT;
1401       *comps = 4;
1402       return;
1403
1404    /**
1405     * \name Non-normalized unsigned integer formats.
1406     */
1407    case MESA_FORMAT_R_UINT8:
1408       *datatype = GL_UNSIGNED_BYTE;
1409       *comps = 1;
1410       return;
1411    case MESA_FORMAT_RG_UINT8:
1412       *datatype = GL_UNSIGNED_BYTE;
1413       *comps = 2;
1414       return;
1415    case MESA_FORMAT_RGB_UINT8:
1416       *datatype = GL_UNSIGNED_BYTE;
1417       *comps = 3;
1418       return;
1419    case MESA_FORMAT_RGBA_UINT8:
1420       *datatype = GL_UNSIGNED_BYTE;
1421       *comps = 4;
1422       return;
1423    case MESA_FORMAT_R_UINT16:
1424       *datatype = GL_UNSIGNED_SHORT;
1425       *comps = 1;
1426       return;
1427    case MESA_FORMAT_RG_UINT16:
1428       *datatype = GL_UNSIGNED_SHORT;
1429       *comps = 2;
1430       return;
1431    case MESA_FORMAT_RGB_UINT16:
1432       *datatype = GL_UNSIGNED_SHORT;
1433       *comps = 3;
1434       return;
1435    case MESA_FORMAT_RGBA_UINT16:
1436       *datatype = GL_UNSIGNED_SHORT;
1437       *comps = 4;
1438       return;
1439    case MESA_FORMAT_R_UINT32:
1440       *datatype = GL_UNSIGNED_INT;
1441       *comps = 1;
1442       return;
1443    case MESA_FORMAT_RG_UINT32:
1444       *datatype = GL_UNSIGNED_INT;
1445       *comps = 2;
1446       return;
1447    case MESA_FORMAT_RGB_UINT32:
1448       *datatype = GL_UNSIGNED_INT;
1449       *comps = 3;
1450       return;
1451    case MESA_FORMAT_RGBA_UINT32:
1452       *datatype = GL_UNSIGNED_INT;
1453       *comps = 4;
1454       return;
1455
1456    case MESA_FORMAT_R9G9B9E5_FLOAT:
1457       *datatype = GL_UNSIGNED_INT_5_9_9_9_REV;
1458       *comps = 3;
1459       return;
1460
1461    case MESA_FORMAT_R11G11B10_FLOAT:
1462       *datatype = GL_UNSIGNED_INT_10F_11F_11F_REV;
1463       *comps = 3;
1464       return;
1465
1466    case MESA_FORMAT_B10G10R10A2_UINT:
1467    case MESA_FORMAT_R10G10B10A2_UINT:
1468       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1469       *comps = 4;
1470       return;
1471
1472    case MESA_FORMAT_R8G8B8X8_SRGB:
1473    case MESA_FORMAT_X8B8G8R8_SRGB:
1474    case MESA_FORMAT_RGBX_UINT8:
1475       *datatype = GL_UNSIGNED_BYTE;
1476       *comps = 4;
1477       return;
1478
1479    case MESA_FORMAT_R8G8B8X8_SNORM:
1480    case MESA_FORMAT_RGBX_SINT8:
1481       *datatype = GL_BYTE;
1482       *comps = 4;
1483       return;
1484
1485    case MESA_FORMAT_B10G10R10X2_UNORM:
1486    case MESA_FORMAT_R10G10B10X2_UNORM:
1487       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1488       *comps = 4;
1489       return;
1490
1491    case MESA_FORMAT_RGBX_UNORM16:
1492    case MESA_FORMAT_RGBX_UINT16:
1493       *datatype = GL_UNSIGNED_SHORT;
1494       *comps = 4;
1495       return;
1496
1497    case MESA_FORMAT_RGBX_SNORM16:
1498    case MESA_FORMAT_RGBX_SINT16:
1499       *datatype = GL_SHORT;
1500       *comps = 4;
1501       return;
1502
1503    case MESA_FORMAT_RGBX_FLOAT16:
1504       *datatype = GL_HALF_FLOAT;
1505       *comps = 4;
1506       return;
1507
1508    case MESA_FORMAT_RGBX_FLOAT32:
1509       *datatype = GL_FLOAT;
1510       *comps = 4;
1511       return;
1512
1513    case MESA_FORMAT_RGBX_UINT32:
1514       *datatype = GL_UNSIGNED_INT;
1515       *comps = 4;
1516       return;
1517
1518    case MESA_FORMAT_RGBX_SINT32:
1519       *datatype = GL_INT;
1520       *comps = 4;
1521       return;
1522
1523    case MESA_FORMAT_R10G10B10A2_UNORM:
1524       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1525       *comps = 4;
1526       return;
1527
1528    case MESA_FORMAT_G8R8_SNORM:
1529       *datatype = GL_BYTE;
1530       *comps = 2;
1531       return;
1532
1533    case MESA_FORMAT_G16R16_SNORM:
1534       *datatype = GL_SHORT;
1535       *comps = 2;
1536       return;
1537
1538    case MESA_FORMAT_B8G8R8X8_SRGB:
1539    case MESA_FORMAT_X8R8G8B8_SRGB:
1540       *datatype = GL_UNSIGNED_BYTE;
1541       *comps = 4;
1542       return;
1543
1544    case MESA_FORMAT_COUNT:
1545       assert(0);
1546       return;
1547
1548    case MESA_FORMAT_NONE:
1549    /* For debug builds, warn if any formats are not handled */
1550 #ifdef DEBUG
1551    default:
1552 #endif
1553       _mesa_problem(NULL, "bad format %s in _mesa_format_to_type_and_comps",
1554                     _mesa_get_format_name(format));
1555       *datatype = 0;
1556       *comps = 1;
1557    }
1558 }
1559
1560 /**
1561  * Check if a mesa_format exactly matches a GL format/type combination
1562  * such that we can use memcpy() from one to the other.
1563  * \param mesa_format  a MESA_FORMAT_x value
1564  * \param format  the user-specified image format
1565  * \param type  the user-specified image datatype
1566  * \param swapBytes  typically the current pixel pack/unpack byteswap state
1567  * \return GL_TRUE if the formats match, GL_FALSE otherwise.
1568  */
1569 GLboolean
1570 _mesa_format_matches_format_and_type(mesa_format mesa_format,
1571                                      GLenum format, GLenum type,
1572                                      GLboolean swapBytes)
1573 {
1574    const GLboolean littleEndian = _mesa_little_endian();
1575
1576    /* Note: When reading a GL format/type combination, the format lists channel
1577     * assignments from most significant channel in the type to least
1578     * significant.  A type with _REV indicates that the assignments are
1579     * swapped, so they are listed from least significant to most significant.
1580     *
1581     * For sanity, please keep this switch statement ordered the same as the
1582     * enums in formats.h.
1583     */
1584
1585    switch (mesa_format) {
1586
1587    case MESA_FORMAT_NONE:
1588    case MESA_FORMAT_COUNT:
1589       return GL_FALSE;
1590
1591    case MESA_FORMAT_A8B8G8R8_UNORM:
1592    case MESA_FORMAT_A8B8G8R8_SRGB:
1593       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1594          return GL_TRUE;
1595
1596       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
1597          return GL_TRUE;
1598
1599       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && !littleEndian)
1600          return GL_TRUE;
1601
1602       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV
1603           && !swapBytes)
1604          return GL_TRUE;
1605
1606       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8
1607           && swapBytes)
1608          return GL_TRUE;
1609
1610       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && littleEndian)
1611          return GL_TRUE;
1612
1613       return GL_FALSE;
1614
1615    case MESA_FORMAT_R8G8B8A8_UNORM:
1616    case MESA_FORMAT_R8G8B8A8_SRGB:
1617       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1618           !swapBytes)
1619          return GL_TRUE;
1620
1621       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1622          return GL_TRUE;
1623
1624       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && littleEndian)
1625          return GL_TRUE;
1626
1627       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8 &&
1628           !swapBytes)
1629          return GL_TRUE;
1630
1631       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1632           swapBytes)
1633          return GL_TRUE;
1634
1635       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && !littleEndian)
1636          return GL_TRUE;
1637
1638       return GL_FALSE;
1639
1640    case MESA_FORMAT_B8G8R8A8_UNORM:
1641    case MESA_FORMAT_B8G8R8A8_SRGB:
1642       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1643           !swapBytes)
1644          return GL_TRUE;
1645
1646       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1647          return GL_TRUE;
1648
1649       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && littleEndian)
1650          return GL_TRUE;
1651
1652       return GL_FALSE;
1653
1654    case MESA_FORMAT_A8R8G8B8_UNORM:
1655    case MESA_FORMAT_A8R8G8B8_SRGB:
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_INT_8_8_8_8_REV &&
1660           swapBytes)
1661          return GL_TRUE;
1662
1663       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && !littleEndian)
1664          return GL_TRUE;
1665
1666       return GL_FALSE;
1667
1668    case MESA_FORMAT_X8B8G8R8_UNORM:
1669    case MESA_FORMAT_R8G8B8X8_UNORM:
1670       return GL_FALSE;
1671
1672    case MESA_FORMAT_B8G8R8X8_UNORM:
1673    case MESA_FORMAT_X8R8G8B8_UNORM:
1674       return GL_FALSE;
1675
1676    case MESA_FORMAT_BGR_UNORM8:
1677    case MESA_FORMAT_BGR_SRGB8:
1678       return format == GL_BGR && type == GL_UNSIGNED_BYTE && littleEndian;
1679
1680    case MESA_FORMAT_RGB_UNORM8:
1681       return format == GL_RGB && type == GL_UNSIGNED_BYTE && littleEndian;
1682
1683    case MESA_FORMAT_B5G6R5_UNORM:
1684       return ((format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) ||
1685               (format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1686               !swapBytes;
1687
1688    case MESA_FORMAT_R5G6B5_UNORM:
1689       return ((format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5) ||
1690               (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1691               !swapBytes;
1692
1693    case MESA_FORMAT_B4G4R4A4_UNORM:
1694       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
1695          !swapBytes;
1696
1697    case MESA_FORMAT_A4R4G4B4_UNORM:
1698       return GL_FALSE;
1699
1700    case MESA_FORMAT_A1B5G5R5_UNORM:
1701       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1702          !swapBytes;
1703
1704    case MESA_FORMAT_B5G5R5A1_UNORM:
1705       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
1706          !swapBytes;
1707
1708    case MESA_FORMAT_A1R5G5B5_UNORM:
1709       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1710          !swapBytes;
1711
1712    case MESA_FORMAT_L4A4_UNORM:
1713       return GL_FALSE;
1714    case MESA_FORMAT_L8A8_UNORM:
1715    case MESA_FORMAT_L8A8_SRGB:
1716       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_BYTE && littleEndian;
1717    case MESA_FORMAT_A8L8_UNORM:
1718    case MESA_FORMAT_A8L8_SRGB:
1719       return GL_FALSE;
1720
1721    case MESA_FORMAT_L16A16_UNORM:
1722       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_SHORT && littleEndian && !swapBytes;
1723    case MESA_FORMAT_A16L16_UNORM:
1724       return GL_FALSE;
1725
1726    case MESA_FORMAT_B2G3R3_UNORM:
1727       return format == GL_RGB && type == GL_UNSIGNED_BYTE_3_3_2;
1728
1729    case MESA_FORMAT_R3G3B2_UNORM:
1730       return format == GL_RGB && type == GL_UNSIGNED_BYTE_2_3_3_REV;
1731
1732    case MESA_FORMAT_A4B4G4R4_UNORM:
1733       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1734          return GL_TRUE;
1735
1736       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1737          return GL_TRUE;
1738
1739       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1740          return GL_TRUE;
1741
1742       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1743          return GL_TRUE;
1744
1745       return GL_FALSE;
1746
1747    case MESA_FORMAT_R4G4B4A4_UNORM:
1748       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1749          return GL_TRUE;
1750
1751       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1752          return GL_TRUE;
1753
1754       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1755          return GL_TRUE;
1756
1757       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1758          return GL_TRUE;
1759
1760       return GL_FALSE;
1761
1762    case MESA_FORMAT_R5G5B5A1_UNORM:
1763       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
1764
1765    case MESA_FORMAT_A2B10G10R10_UNORM:
1766       return format == GL_RGBA && type == GL_UNSIGNED_INT_10_10_10_2;
1767
1768    case MESA_FORMAT_A2B10G10R10_UINT:
1769       return format == GL_RGBA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1770
1771    case MESA_FORMAT_A2R10G10B10_UNORM:
1772       return format == GL_BGRA && type == GL_UNSIGNED_INT_10_10_10_2;
1773
1774    case MESA_FORMAT_A2R10G10B10_UINT:
1775       return format == GL_BGRA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1776
1777    case MESA_FORMAT_A_UNORM8:
1778       return format == GL_ALPHA && type == GL_UNSIGNED_BYTE;
1779    case MESA_FORMAT_A_UNORM16:
1780       return format == GL_ALPHA && type == GL_UNSIGNED_SHORT && !swapBytes;
1781    case MESA_FORMAT_L_UNORM8:
1782    case MESA_FORMAT_L_SRGB8:
1783       return format == GL_LUMINANCE && type == GL_UNSIGNED_BYTE;
1784    case MESA_FORMAT_L_UNORM16:
1785       return format == GL_LUMINANCE && type == GL_UNSIGNED_SHORT && !swapBytes;
1786    case MESA_FORMAT_I_UNORM8:
1787       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1788    case MESA_FORMAT_I_UNORM16:
1789       return format == GL_RED && type == GL_UNSIGNED_SHORT && !swapBytes;
1790
1791    case MESA_FORMAT_YCBCR:
1792       return format == GL_YCBCR_MESA &&
1793              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian != swapBytes) ||
1794               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian == swapBytes));
1795    case MESA_FORMAT_YCBCR_REV:
1796       return format == GL_YCBCR_MESA &&
1797              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian == swapBytes) ||
1798               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian != swapBytes));
1799
1800    case MESA_FORMAT_R_UNORM8:
1801       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1802    case MESA_FORMAT_R8G8_UNORM:
1803       return format == GL_RG && type == GL_UNSIGNED_BYTE && littleEndian;
1804    case MESA_FORMAT_G8R8_UNORM:
1805       return GL_FALSE;
1806
1807    case MESA_FORMAT_R_UNORM16:
1808       return format == GL_RED && type == GL_UNSIGNED_SHORT &&
1809          !swapBytes;
1810    case MESA_FORMAT_R16G16_UNORM:
1811       return format == GL_RG && type == GL_UNSIGNED_SHORT && littleEndian &&
1812          !swapBytes;
1813    case MESA_FORMAT_G16R16_UNORM:
1814       return GL_FALSE;
1815
1816    case MESA_FORMAT_B10G10R10A2_UNORM:
1817       return format == GL_BGRA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1818          !swapBytes;
1819
1820    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1821       return format == GL_DEPTH_STENCIL && type == GL_UNSIGNED_INT_24_8 &&
1822          !swapBytes;
1823    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1824    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1825       return GL_FALSE;
1826
1827    case MESA_FORMAT_Z_UNORM16:
1828       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_SHORT &&
1829          !swapBytes;
1830
1831    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1832       return GL_FALSE;
1833
1834    case MESA_FORMAT_Z_UNORM32:
1835       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_INT &&
1836          !swapBytes;
1837
1838    case MESA_FORMAT_S_UINT8:
1839       return format == GL_STENCIL_INDEX && type == GL_UNSIGNED_BYTE;
1840
1841    case MESA_FORMAT_SRGB_DXT1:
1842    case MESA_FORMAT_SRGBA_DXT1:
1843    case MESA_FORMAT_SRGBA_DXT3:
1844    case MESA_FORMAT_SRGBA_DXT5:
1845       return GL_FALSE;
1846
1847    case MESA_FORMAT_RGB_FXT1:
1848    case MESA_FORMAT_RGBA_FXT1:
1849    case MESA_FORMAT_RGB_DXT1:
1850    case MESA_FORMAT_RGBA_DXT1:
1851    case MESA_FORMAT_RGBA_DXT3:
1852    case MESA_FORMAT_RGBA_DXT5:
1853       return GL_FALSE;
1854
1855    case MESA_FORMAT_BPTC_RGBA_UNORM:
1856    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
1857    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
1858    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
1859       return GL_FALSE;
1860
1861    case MESA_FORMAT_RGBA_FLOAT32:
1862       return format == GL_RGBA && type == GL_FLOAT && !swapBytes;
1863    case MESA_FORMAT_RGBA_FLOAT16:
1864       return format == GL_RGBA && type == GL_HALF_FLOAT && !swapBytes;
1865
1866    case MESA_FORMAT_RGB_FLOAT32:
1867       return format == GL_RGB && type == GL_FLOAT && !swapBytes;
1868    case MESA_FORMAT_RGB_FLOAT16:
1869       return format == GL_RGB && type == GL_HALF_FLOAT && !swapBytes;
1870
1871    case MESA_FORMAT_A_FLOAT32:
1872       return format == GL_ALPHA && type == GL_FLOAT && !swapBytes;
1873    case MESA_FORMAT_A_FLOAT16:
1874       return format == GL_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1875
1876    case MESA_FORMAT_L_FLOAT32:
1877       return format == GL_LUMINANCE && type == GL_FLOAT && !swapBytes;
1878    case MESA_FORMAT_L_FLOAT16:
1879       return format == GL_LUMINANCE && type == GL_HALF_FLOAT && !swapBytes;
1880
1881    case MESA_FORMAT_LA_FLOAT32:
1882       return format == GL_LUMINANCE_ALPHA && type == GL_FLOAT && !swapBytes;
1883    case MESA_FORMAT_LA_FLOAT16:
1884       return format == GL_LUMINANCE_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1885
1886    case MESA_FORMAT_I_FLOAT32:
1887       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1888    case MESA_FORMAT_I_FLOAT16:
1889       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1890
1891    case MESA_FORMAT_R_FLOAT32:
1892       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1893    case MESA_FORMAT_R_FLOAT16:
1894       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1895
1896    case MESA_FORMAT_RG_FLOAT32:
1897       return format == GL_RG && type == GL_FLOAT && !swapBytes;
1898    case MESA_FORMAT_RG_FLOAT16:
1899       return format == GL_RG && type == GL_HALF_FLOAT && !swapBytes;
1900
1901    case MESA_FORMAT_A_UINT8:
1902       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_BYTE;
1903    case MESA_FORMAT_A_UINT16:
1904       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_SHORT &&
1905              !swapBytes;
1906    case MESA_FORMAT_A_UINT32:
1907       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_INT &&
1908              !swapBytes;
1909    case MESA_FORMAT_A_SINT8:
1910       return format == GL_ALPHA_INTEGER && type == GL_BYTE;
1911    case MESA_FORMAT_A_SINT16:
1912       return format == GL_ALPHA_INTEGER && type == GL_SHORT && !swapBytes;
1913    case MESA_FORMAT_A_SINT32:
1914       return format == GL_ALPHA_INTEGER && type == GL_INT && !swapBytes;
1915
1916    case MESA_FORMAT_I_UINT8:
1917       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1918    case MESA_FORMAT_I_UINT16:
1919       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1920    case MESA_FORMAT_I_UINT32:
1921       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1922    case MESA_FORMAT_I_SINT8:
1923       return format == GL_RED_INTEGER && type == GL_BYTE;
1924    case MESA_FORMAT_I_SINT16:
1925       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1926    case MESA_FORMAT_I_SINT32:
1927       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1928
1929    case MESA_FORMAT_L_UINT8:
1930       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_BYTE;
1931    case MESA_FORMAT_L_UINT16:
1932       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_SHORT &&
1933              !swapBytes;
1934    case MESA_FORMAT_L_UINT32:
1935       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_INT &&
1936              !swapBytes;
1937    case MESA_FORMAT_L_SINT8:
1938       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_BYTE;
1939    case MESA_FORMAT_L_SINT16:
1940       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_SHORT &&
1941              !swapBytes;
1942    case MESA_FORMAT_L_SINT32:
1943       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_INT && !swapBytes;
1944
1945    case MESA_FORMAT_LA_UINT8:
1946       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1947              type == GL_UNSIGNED_BYTE && !swapBytes;
1948    case MESA_FORMAT_LA_UINT16:
1949       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1950              type == GL_UNSIGNED_SHORT && !swapBytes;
1951    case MESA_FORMAT_LA_UINT32:
1952       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1953              type == GL_UNSIGNED_INT && !swapBytes;
1954    case MESA_FORMAT_LA_SINT8:
1955       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_BYTE &&
1956              !swapBytes;
1957    case MESA_FORMAT_LA_SINT16:
1958       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_SHORT &&
1959              !swapBytes;
1960    case MESA_FORMAT_LA_SINT32:
1961       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_INT &&
1962              !swapBytes;
1963
1964    case MESA_FORMAT_R_SINT8:
1965       return format == GL_RED_INTEGER && type == GL_BYTE;
1966    case MESA_FORMAT_RG_SINT8:
1967       return format == GL_RG_INTEGER && type == GL_BYTE && !swapBytes;
1968    case MESA_FORMAT_RGB_SINT8:
1969       return format == GL_RGB_INTEGER && type == GL_BYTE && !swapBytes;
1970    case MESA_FORMAT_RGBA_SINT8:
1971       return format == GL_RGBA_INTEGER && type == GL_BYTE && !swapBytes;
1972    case MESA_FORMAT_R_SINT16:
1973       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1974    case MESA_FORMAT_RG_SINT16:
1975       return format == GL_RG_INTEGER && type == GL_SHORT && !swapBytes;
1976    case MESA_FORMAT_RGB_SINT16:
1977       return format == GL_RGB_INTEGER && type == GL_SHORT && !swapBytes;
1978    case MESA_FORMAT_RGBA_SINT16:
1979       return format == GL_RGBA_INTEGER && type == GL_SHORT && !swapBytes;
1980    case MESA_FORMAT_R_SINT32:
1981       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1982    case MESA_FORMAT_RG_SINT32:
1983       return format == GL_RG_INTEGER && type == GL_INT && !swapBytes;
1984    case MESA_FORMAT_RGB_SINT32:
1985       return format == GL_RGB_INTEGER && type == GL_INT && !swapBytes;
1986    case MESA_FORMAT_RGBA_SINT32:
1987       return format == GL_RGBA_INTEGER && type == GL_INT && !swapBytes;
1988
1989    case MESA_FORMAT_R_UINT8:
1990       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1991    case MESA_FORMAT_RG_UINT8:
1992       return format == GL_RG_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1993    case MESA_FORMAT_RGB_UINT8:
1994       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1995    case MESA_FORMAT_RGBA_UINT8:
1996       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_BYTE &&
1997              !swapBytes;
1998    case MESA_FORMAT_R_UINT16:
1999       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT &&
2000              !swapBytes;
2001    case MESA_FORMAT_RG_UINT16:
2002       return format == GL_RG_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
2003    case MESA_FORMAT_RGB_UINT16:
2004       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT &&
2005              !swapBytes;
2006    case MESA_FORMAT_RGBA_UINT16:
2007       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT &&
2008              !swapBytes;
2009    case MESA_FORMAT_R_UINT32:
2010       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
2011    case MESA_FORMAT_RG_UINT32:
2012       return format == GL_RG_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
2013    case MESA_FORMAT_RGB_UINT32:
2014       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
2015    case MESA_FORMAT_RGBA_UINT32:
2016       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
2017
2018    case MESA_FORMAT_R_SNORM8:
2019       return format == GL_RED && type == GL_BYTE;
2020    case MESA_FORMAT_R8G8_SNORM:
2021       return format == GL_RG && type == GL_BYTE && littleEndian &&
2022              !swapBytes;
2023    case MESA_FORMAT_X8B8G8R8_SNORM:
2024       return GL_FALSE;
2025
2026    case MESA_FORMAT_A8B8G8R8_SNORM:
2027       if (format == GL_RGBA && type == GL_BYTE && !littleEndian)
2028          return GL_TRUE;
2029
2030       if (format == GL_ABGR_EXT && type == GL_BYTE && littleEndian)
2031          return GL_TRUE;
2032
2033       return GL_FALSE;
2034
2035    case MESA_FORMAT_R8G8B8A8_SNORM:
2036       if (format == GL_RGBA && type == GL_BYTE && littleEndian)
2037          return GL_TRUE;
2038
2039       if (format == GL_ABGR_EXT && type == GL_BYTE && !littleEndian)
2040          return GL_TRUE;
2041
2042       return GL_FALSE;
2043
2044    case MESA_FORMAT_R_SNORM16:
2045       return format == GL_RED && type == GL_SHORT &&
2046              !swapBytes;
2047    case MESA_FORMAT_R16G16_SNORM:
2048       return format == GL_RG && type == GL_SHORT && littleEndian && !swapBytes;
2049    case MESA_FORMAT_RGB_SNORM16:
2050       return format == GL_RGB && type == GL_SHORT && !swapBytes;
2051    case MESA_FORMAT_RGBA_SNORM16:
2052       return format == GL_RGBA && type == GL_SHORT && !swapBytes;
2053    case MESA_FORMAT_RGBA_UNORM16:
2054       return format == GL_RGBA && type == GL_UNSIGNED_SHORT &&
2055              !swapBytes;
2056
2057    case MESA_FORMAT_R_RGTC1_UNORM:
2058    case MESA_FORMAT_R_RGTC1_SNORM:
2059    case MESA_FORMAT_RG_RGTC2_UNORM:
2060    case MESA_FORMAT_RG_RGTC2_SNORM:
2061       return GL_FALSE;
2062
2063    case MESA_FORMAT_L_LATC1_UNORM:
2064    case MESA_FORMAT_L_LATC1_SNORM:
2065    case MESA_FORMAT_LA_LATC2_UNORM:
2066    case MESA_FORMAT_LA_LATC2_SNORM:
2067       return GL_FALSE;
2068
2069    case MESA_FORMAT_ETC1_RGB8:
2070    case MESA_FORMAT_ETC2_RGB8:
2071    case MESA_FORMAT_ETC2_SRGB8:
2072    case MESA_FORMAT_ETC2_RGBA8_EAC:
2073    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
2074    case MESA_FORMAT_ETC2_R11_EAC:
2075    case MESA_FORMAT_ETC2_RG11_EAC:
2076    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
2077    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
2078    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
2079    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
2080       return GL_FALSE;
2081
2082    case MESA_FORMAT_A_SNORM8:
2083       return format == GL_ALPHA && type == GL_BYTE;
2084    case MESA_FORMAT_L_SNORM8:
2085       return format == GL_LUMINANCE && type == GL_BYTE;
2086    case MESA_FORMAT_L8A8_SNORM:
2087       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
2088              littleEndian && !swapBytes;
2089    case MESA_FORMAT_A8L8_SNORM:
2090       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
2091              !littleEndian && !swapBytes;
2092    case MESA_FORMAT_I_SNORM8:
2093       return format == GL_RED && type == GL_BYTE;
2094    case MESA_FORMAT_A_SNORM16:
2095       return format == GL_ALPHA && type == GL_SHORT && !swapBytes;
2096    case MESA_FORMAT_L_SNORM16:
2097       return format == GL_LUMINANCE && type == GL_SHORT && !swapBytes;
2098    case MESA_FORMAT_LA_SNORM16:
2099       return format == GL_LUMINANCE_ALPHA && type == GL_SHORT &&
2100              littleEndian && !swapBytes;
2101    case MESA_FORMAT_I_SNORM16:
2102       return format == GL_RED && type == GL_SHORT && littleEndian &&
2103              !swapBytes;
2104
2105    case MESA_FORMAT_B10G10R10A2_UINT:
2106       return (format == GL_BGRA_INTEGER_EXT &&
2107               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2108               !swapBytes);
2109
2110    case MESA_FORMAT_R10G10B10A2_UINT:
2111       return (format == GL_RGBA_INTEGER_EXT &&
2112               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2113               !swapBytes);
2114
2115    case MESA_FORMAT_R9G9B9E5_FLOAT:
2116       return format == GL_RGB && type == GL_UNSIGNED_INT_5_9_9_9_REV &&
2117          !swapBytes;
2118
2119    case MESA_FORMAT_R11G11B10_FLOAT:
2120       return format == GL_RGB && type == GL_UNSIGNED_INT_10F_11F_11F_REV &&
2121          !swapBytes;
2122
2123    case MESA_FORMAT_Z_FLOAT32:
2124       return format == GL_DEPTH_COMPONENT && type == GL_FLOAT && !swapBytes;
2125
2126    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
2127       return format == GL_DEPTH_STENCIL &&
2128              type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV && !swapBytes;
2129
2130    case MESA_FORMAT_B4G4R4X4_UNORM:
2131    case MESA_FORMAT_B5G5R5X1_UNORM:
2132    case MESA_FORMAT_R8G8B8X8_SNORM:
2133    case MESA_FORMAT_R8G8B8X8_SRGB:
2134    case MESA_FORMAT_X8B8G8R8_SRGB:
2135    case MESA_FORMAT_RGBX_UINT8:
2136    case MESA_FORMAT_RGBX_SINT8:
2137    case MESA_FORMAT_B10G10R10X2_UNORM:
2138    case MESA_FORMAT_R10G10B10X2_UNORM:
2139    case MESA_FORMAT_RGBX_UNORM16:
2140    case MESA_FORMAT_RGBX_SNORM16:
2141    case MESA_FORMAT_RGBX_FLOAT16:
2142    case MESA_FORMAT_RGBX_UINT16:
2143    case MESA_FORMAT_RGBX_SINT16:
2144    case MESA_FORMAT_RGBX_FLOAT32:
2145    case MESA_FORMAT_RGBX_UINT32:
2146    case MESA_FORMAT_RGBX_SINT32:
2147       return GL_FALSE;
2148
2149    case MESA_FORMAT_R10G10B10A2_UNORM:
2150       return format == GL_RGBA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2151          !swapBytes;
2152
2153    case MESA_FORMAT_G8R8_SNORM:
2154       return format == GL_RG && type == GL_BYTE && !littleEndian &&
2155          !swapBytes;
2156
2157    case MESA_FORMAT_G16R16_SNORM:
2158       return format == GL_RG && type == GL_SHORT && !littleEndian &&
2159          !swapBytes;
2160
2161    case MESA_FORMAT_B8G8R8X8_SRGB:
2162    case MESA_FORMAT_X8R8G8B8_SRGB:
2163       return GL_FALSE;
2164    }
2165
2166    return GL_FALSE;
2167 }
2168