src/mesa/main/formats.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (c) 2008-2009  VMware, Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 #include "imports.h"
  28 #include "formats.h"
  29 #include "macros.h"
  30 #include "glformats.h"
  31 #include "c11/threads.h"
  32 #include "util/hash_table.h"
  33
  34 /**
  35  * Information about texture formats.
  36  */
  37 struct gl_format_info
  38 {
  39    mesa_format Name;
  40
  41    /** text name for debugging */
  42    const char *StrName;
  43
  44    enum mesa_format_layout Layout;
  45
  46    /**
  47     * Base format is one of GL_RED, GL_RG, GL_RGB, GL_RGBA, GL_ALPHA,
  48     * GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY, GL_YCBCR_MESA,
  49     * GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
  50     */
  51    GLenum BaseFormat;
  52
  53    /**
  54     * Logical data type: one of  GL_UNSIGNED_NORMALIZED, GL_SIGNED_NORMALIZED,
  55     * GL_UNSIGNED_INT, GL_INT, GL_FLOAT.
  56     */
  57    GLenum DataType;
  58
  59    GLubyte RedBits;
  60    GLubyte GreenBits;
  61    GLubyte BlueBits;
  62    GLubyte AlphaBits;
  63    GLubyte LuminanceBits;
  64    GLubyte IntensityBits;
  65    GLubyte DepthBits;
  66    GLubyte StencilBits;
  67
  68    bool IsSRGBFormat;
  69
  70    /**
  71     * To describe compressed formats.  If not compressed, Width=Height=1.
  72     */
  73    GLubyte BlockWidth, BlockHeight;
  74    GLubyte BytesPerBlock;
  75
  76    uint8_t Swizzle[4];
  77    mesa_array_format ArrayFormat;
  78 };
  79
  80 #include "format_info.h"
  81
  82 static const struct gl_format_info *
  83 _mesa_get_format_info(mesa_format format)
  84 {
  85    const struct gl_format_info *info = &format_info[format];
  86    STATIC_ASSERT(ARRAY_SIZE(format_info) == MESA_FORMAT_COUNT);
  87    assert(info->Name == format);
  88    return info;
  89 }
  90
  91
  92 /** Return string name of format (for debugging) */
  93 const char *
  94 _mesa_get_format_name(mesa_format format)
  95 {
  96    const struct gl_format_info *info = _mesa_get_format_info(format);
  97    return info->StrName;
  98 }
  99
 100
 101
 102 /**
 103  * Return bytes needed to store a block of pixels in the given format.
 104  * Normally, a block is 1x1 (a single pixel).  But for compressed formats
 105  * a block may be 4x4 or 8x4, etc.
 106  *
 107  * Note: not GLuint, so as not to coerce math to unsigned. cf. fdo #37351
 108  */
 109 GLint
 110 _mesa_get_format_bytes(mesa_format format)
 111 {
 112    const struct gl_format_info *info = _mesa_get_format_info(format);
 113    assert(info->BytesPerBlock);
 114    assert(info->BytesPerBlock <= MAX_PIXEL_BYTES ||
 115           _mesa_is_format_compressed(format));
 116    return info->BytesPerBlock;
 117 }
 118
 119
 120 /**
 121  * Return bits per component for the given format.
 122  * \param format  one of MESA_FORMAT_x
 123  * \param pname  the component, such as GL_RED_BITS, GL_TEXTURE_BLUE_BITS, etc.
 124  */
 125 GLint
 126 _mesa_get_format_bits(mesa_format format, GLenum pname)
 127 {
 128    const struct gl_format_info *info = _mesa_get_format_info(format);
 129
 130    switch (pname) {
 131    case GL_RED_BITS:
 132    case GL_TEXTURE_RED_SIZE:
 133    case GL_RENDERBUFFER_RED_SIZE_EXT:
 134    case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
 135       return info->RedBits;
 136    case GL_GREEN_BITS:
 137    case GL_TEXTURE_GREEN_SIZE:
 138    case GL_RENDERBUFFER_GREEN_SIZE_EXT:
 139    case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
 140       return info->GreenBits;
 141    case GL_BLUE_BITS:
 142    case GL_TEXTURE_BLUE_SIZE:
 143    case GL_RENDERBUFFER_BLUE_SIZE_EXT:
 144    case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
 145       return info->BlueBits;
 146    case GL_ALPHA_BITS:
 147    case GL_TEXTURE_ALPHA_SIZE:
 148    case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
 149    case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
 150       return info->AlphaBits;
 151    case GL_TEXTURE_INTENSITY_SIZE:
 152       return info->IntensityBits;
 153    case GL_TEXTURE_LUMINANCE_SIZE:
 154       return info->LuminanceBits;
 155    case GL_INDEX_BITS:
 156       return 0;
 157    case GL_DEPTH_BITS:
 158    case GL_TEXTURE_DEPTH_SIZE_ARB:
 159    case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
 160    case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
 161       return info->DepthBits;
 162    case GL_STENCIL_BITS:
 163    case GL_TEXTURE_STENCIL_SIZE_EXT:
 164    case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
 165    case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
 166       return info->StencilBits;
 167    default:
 168       _mesa_problem(NULL, "bad pname in _mesa_get_format_bits()");
 169       return 0;
 170    }
 171 }
 172
 173
 174 GLuint
 175 _mesa_get_format_max_bits(mesa_format format)
 176 {
 177    const struct gl_format_info *info = _mesa_get_format_info(format);
 178    GLuint max = MAX2(info->RedBits, info->GreenBits);
 179    max = MAX2(max, info->BlueBits);
 180    max = MAX2(max, info->AlphaBits);
 181    max = MAX2(max, info->LuminanceBits);
 182    max = MAX2(max, info->IntensityBits);
 183    max = MAX2(max, info->DepthBits);
 184    max = MAX2(max, info->StencilBits);
 185    return max;
 186 }
 187
 188
 189 /**
 190  * Return the layout type of the given format.
 191  * The return value will be one of:
 192  *    MESA_FORMAT_LAYOUT_ARRAY
 193  *    MESA_FORMAT_LAYOUT_PACKED
 194  *    MESA_FORMAT_LAYOUT_S3TC
 195  *    MESA_FORMAT_LAYOUT_RGTC
 196  *    MESA_FORMAT_LAYOUT_FXT1
 197  *    MESA_FORMAT_LAYOUT_ETC1
 198  *    MESA_FORMAT_LAYOUT_ETC2
 199  *    MESA_FORMAT_LAYOUT_BPTC
 200  *    MESA_FORMAT_LAYOUT_OTHER
 201  */
 202 extern enum mesa_format_layout
 203 _mesa_get_format_layout(mesa_format format)
 204 {
 205    const struct gl_format_info *info = _mesa_get_format_info(format);
 206    return info->Layout;
 207 }
 208
 209
 210 /**
 211  * Return the data type (or more specifically, the data representation)
 212  * for the given format.
 213  * The return value will be one of:
 214  *    GL_UNSIGNED_NORMALIZED = unsigned int representing [0,1]
 215  *    GL_SIGNED_NORMALIZED = signed int representing [-1, 1]
 216  *    GL_UNSIGNED_INT = an ordinary unsigned integer
 217  *    GL_INT = an ordinary signed integer
 218  *    GL_FLOAT = an ordinary float
 219  */
 220 GLenum
 221 _mesa_get_format_datatype(mesa_format format)
 222 {
 223    const struct gl_format_info *info = _mesa_get_format_info(format);
 224    return info->DataType;
 225 }
 226
 227 static GLenum
 228 get_base_format_for_array_format(mesa_array_format format)
 229 {
 230    uint8_t swizzle[4];
 231    int num_channels;
 232
 233    _mesa_array_format_get_swizzle(format, swizzle);
 234    num_channels = _mesa_array_format_get_num_channels(format);
 235
 236    switch (num_channels) {
 237    case 4:
 238       /* FIXME: RGBX formats have 4 channels, but their base format is GL_RGB.
 239        * This is not really a problem for now because we only create array
 240        * formats from GL format/type combinations, and these cannot specify
 241        * RGBX formats.
 242        */
 243       return GL_RGBA;
 244    case 3:
 245       return GL_RGB;
 246    case 2:
 247       if (swizzle[0] == 0 &&
 248           swizzle[1] == 0 &&
 249           swizzle[2] == 0 &&
 250           swizzle[3] == 1)
 251          return GL_LUMINANCE_ALPHA;
 252       if (swizzle[0] == 1 &&
 253           swizzle[1] == 1 &&
 254           swizzle[2] == 1 &&
 255           swizzle[3] == 0)
 256          return GL_LUMINANCE_ALPHA;
 257       if (swizzle[0] == 0 &&
 258           swizzle[1] == 1 &&
 259           swizzle[2] == 4 &&
 260           swizzle[3] == 5)
 261          return GL_RG;
 262       if (swizzle[0] == 1 &&
 263           swizzle[1] == 0 &&
 264           swizzle[2] == 4 &&
 265           swizzle[3] == 5)
 266          return GL_RG;
 267       break;
 268    case 1:
 269       if (swizzle[0] == 0 &&
 270           swizzle[1] == 0 &&
 271           swizzle[2] == 0 &&
 272           swizzle[3] == 5)
 273          return GL_LUMINANCE;
 274       if (swizzle[0] == 0 &&
 275           swizzle[1] == 0 &&
 276           swizzle[2] == 0 &&
 277           swizzle[3] == 0)
 278          return GL_INTENSITY;
 279       if (swizzle[0] <= MESA_FORMAT_SWIZZLE_W)
 280          return GL_RED;
 281       if (swizzle[1] <= MESA_FORMAT_SWIZZLE_W)
 282          return GL_GREEN;
 283       if (swizzle[2] <= MESA_FORMAT_SWIZZLE_W)
 284          return GL_BLUE;
 285       if (swizzle[3] <= MESA_FORMAT_SWIZZLE_W)
 286          return GL_ALPHA;
 287       break;
 288    }
 289
 290    unreachable("Unsupported format");
 291 }
 292
 293 /**
 294  * Return the basic format for the given type.  The result will be one of
 295  * GL_RGB, GL_RGBA, GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY,
 296  * GL_YCBCR_MESA, GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
 297  * This functions accepts a mesa_format or a mesa_array_format.
 298  */
 299 GLenum
 300 _mesa_get_format_base_format(uint32_t format)
 301 {
 302    if (!_mesa_format_is_mesa_array_format(format)) {
 303       const struct gl_format_info *info = _mesa_get_format_info(format);
 304       return info->BaseFormat;
 305    } else {
 306       return get_base_format_for_array_format(format);
 307    }
 308 }
 309
 310
 311 /**
 312  * Return the block size (in pixels) for the given format.  Normally
 313  * the block size is 1x1.  But compressed formats will have block sizes
 314  * of 4x4 or 8x4 pixels, etc.
 315  * \param bw  returns block width in pixels
 316  * \param bh  returns block height in pixels
 317  */
 318 void
 319 _mesa_get_format_block_size(mesa_format format, GLuint *bw, GLuint *bh)
 320 {
 321    const struct gl_format_info *info = _mesa_get_format_info(format);
 322    *bw = info->BlockWidth;
 323    *bh = info->BlockHeight;
 324 }
 325
 326
 327 /**
 328  * Returns the an array of four numbers representing the transformation
 329  * from the RGBA or SZ colorspace to the given format.  For array formats,
 330  * the i'th RGBA component is given by:
 331  *
 332  * if (swizzle[i] <= MESA_FORMAT_SWIZZLE_W)
 333  *    comp = data[swizzle[i]];
 334  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ZERO)
 335  *    comp = 0;
 336  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ONE)
 337  *    comp = 1;
 338  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_NONE)
 339  *    // data does not contain a channel of this format
 340  *
 341  * For packed formats, the swizzle gives the number of components left of
 342  * the least significant bit.
 343  *
 344  * Compressed formats have no swizzle.
 345  */
 346 void
 347 _mesa_get_format_swizzle(mesa_format format, uint8_t swizzle_out[4])
 348 {
 349    const struct gl_format_info *info = _mesa_get_format_info(format);
 350    memcpy(swizzle_out, info->Swizzle, sizeof(info->Swizzle));
 351 }
 352
 353 mesa_array_format
 354 _mesa_array_format_flip_channels(mesa_array_format format)
 355 {
 356    int num_channels;
 357    uint8_t swizzle[4];
 358
 359    num_channels = _mesa_array_format_get_num_channels(format);
 360    _mesa_array_format_get_swizzle(format, swizzle);
 361
 362    if (num_channels == 1)
 363       return format;
 364
 365    if (num_channels == 2) {
 366       /* Assert that the swizzle makes sense for 2 channels */
 367       for (unsigned i = 0; i < 4; i++)
 368          assert(swizzle[i] != 2 && swizzle[i] != 3);
 369
 370       static const uint8_t flip_xy[6] = { 1, 0, 2, 3, 4, 5 };
 371       _mesa_array_format_set_swizzle(&format,
 372                                      flip_xy[swizzle[0]], flip_xy[swizzle[1]],
 373                                      flip_xy[swizzle[2]], flip_xy[swizzle[3]]);
 374       return format;
 375    }
 376
 377    if (num_channels == 4) {
 378       static const uint8_t flip[6] = { 3, 2, 1, 0, 4, 5 };
 379       _mesa_array_format_set_swizzle(&format,
 380                                      flip[swizzle[0]], flip[swizzle[1]],
 381                                      flip[swizzle[2]], flip[swizzle[3]]);
 382       return format;
 383    }
 384
 385    unreachable("Invalid array format");
 386 }
 387
 388 uint32_t
 389 _mesa_format_to_array_format(mesa_format format)
 390 {
 391    const struct gl_format_info *info = _mesa_get_format_info(format);
 392    if (info->ArrayFormat && !_mesa_little_endian() &&
 393        info->Layout == MESA_FORMAT_LAYOUT_PACKED)
 394       return _mesa_array_format_flip_channels(info->ArrayFormat);
 395    else
 396       return info->ArrayFormat;
 397 }
 398
 399 static struct hash_table *format_array_format_table;
 400 static once_flag format_array_format_table_exists = ONCE_FLAG_INIT;
 401
 402 static bool
 403 array_formats_equal(const void *a, const void *b)
 404 {
 405    return (intptr_t)a == (intptr_t)b;
 406 }
 407
 408 static void
 409 format_array_format_table_init(void)
 410 {
 411    const struct gl_format_info *info;
 412    mesa_array_format array_format;
 413    unsigned f;
 414
 415    format_array_format_table = _mesa_hash_table_create(NULL, NULL,
 416                                                        array_formats_equal);
 417
 418    if (!format_array_format_table) {
 419       _mesa_error_no_memory(__func__);
 420       return;
 421    }
 422
 423    for (f = 1; f < MESA_FORMAT_COUNT; ++f) {
 424       info = _mesa_get_format_info(f);
 425       if (!info->ArrayFormat)
 426          continue;
 427
 428       if (_mesa_little_endian()) {
 429          array_format = info->ArrayFormat;
 430       } else {
 431          array_format = _mesa_array_format_flip_channels(info->ArrayFormat);
 432       }
 433
 434       /* This can happen and does for some of the BGR formats.  Let's take
 435        * the first one in the list.
 436        */
 437       if (_mesa_hash_table_search_pre_hashed(format_array_format_table,
 438                                              array_format,
 439                                              (void *)(intptr_t)array_format))
 440          continue;
 441
 442       _mesa_hash_table_insert_pre_hashed(format_array_format_table,
 443                                          array_format,
 444                                          (void *)(intptr_t)array_format,
 445                                          (void *)(intptr_t)f);
 446    }
 447 }
 448
 449 mesa_format
 450 _mesa_format_from_array_format(uint32_t array_format)
 451 {
 452    struct hash_entry *entry;
 453
 454    assert(_mesa_format_is_mesa_array_format(array_format));
 455
 456    call_once(&format_array_format_table_exists, format_array_format_table_init);
 457
 458    if (!format_array_format_table) {
 459       static const once_flag once_flag_init = ONCE_FLAG_INIT;
 460       format_array_format_table_exists = once_flag_init;
 461       return MESA_FORMAT_NONE;
 462    }
 463
 464    entry = _mesa_hash_table_search_pre_hashed(format_array_format_table,
 465                                               array_format,
 466                                               (void *)(intptr_t)array_format);
 467    if (entry)
 468       return (intptr_t)entry->data;
 469    else
 470       return MESA_FORMAT_NONE;
 471 }
 472
 473 /** Is the given format a compressed format? */
 474 GLboolean
 475 _mesa_is_format_compressed(mesa_format format)
 476 {
 477    const struct gl_format_info *info = _mesa_get_format_info(format);
 478    return info->BlockWidth > 1 || info->BlockHeight > 1;
 479 }
 480
 481
 482 /**
 483  * Determine if the given format represents a packed depth/stencil buffer.
 484  */
 485 GLboolean
 486 _mesa_is_format_packed_depth_stencil(mesa_format format)
 487 {
 488    const struct gl_format_info *info = _mesa_get_format_info(format);
 489
 490    return info->BaseFormat == GL_DEPTH_STENCIL;
 491 }
 492
 493
 494 /**
 495  * Is the given format a signed/unsigned integer color format?
 496  */
 497 GLboolean
 498 _mesa_is_format_integer_color(mesa_format format)
 499 {
 500    const struct gl_format_info *info = _mesa_get_format_info(format);
 501    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT) &&
 502       info->BaseFormat != GL_DEPTH_COMPONENT &&
 503       info->BaseFormat != GL_DEPTH_STENCIL &&
 504       info->BaseFormat != GL_STENCIL_INDEX;
 505 }
 506
 507
 508 /**
 509  * Is the given format an unsigned integer format?
 510  */
 511 GLboolean
 512 _mesa_is_format_unsigned(mesa_format format)
 513 {
 514    const struct gl_format_info *info = _mesa_get_format_info(format);
 515    return _mesa_is_type_unsigned(info->DataType);
 516 }
 517
 518
 519 /**
 520  * Does the given format store signed values?
 521  */
 522 GLboolean
 523 _mesa_is_format_signed(mesa_format format)
 524 {
 525    if (format == MESA_FORMAT_R11G11B10_FLOAT ||
 526        format == MESA_FORMAT_R9G9B9E5_FLOAT) {
 527       /* these packed float formats only store unsigned values */
 528       return GL_FALSE;
 529    }
 530    else {
 531       const struct gl_format_info *info = _mesa_get_format_info(format);
 532       return (info->DataType == GL_SIGNED_NORMALIZED ||
 533               info->DataType == GL_INT ||
 534               info->DataType == GL_FLOAT);
 535    }
 536 }
 537
 538 /**
 539  * Is the given format an integer format?
 540  */
 541 GLboolean
 542 _mesa_is_format_integer(mesa_format format)
 543 {
 544    const struct gl_format_info *info = _mesa_get_format_info(format);
 545    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT);
 546 }
 547
 548
 549 /**
 550  * Return true if the given format is a color format.
 551  */
 552 GLenum
 553 _mesa_is_format_color_format(mesa_format format)
 554 {
 555    const struct gl_format_info *info = _mesa_get_format_info(format);
 556    switch (info->BaseFormat) {
 557    case GL_DEPTH_COMPONENT:
 558    case GL_STENCIL_INDEX:
 559    case GL_DEPTH_STENCIL:
 560       return false;
 561    default:
 562       return true;
 563    }
 564 }
 565
 566
 567 /**
 568  * Return color encoding for given format.
 569  * \return GL_LINEAR or GL_SRGB
 570  */
 571 GLenum
 572 _mesa_get_format_color_encoding(mesa_format format)
 573 {
 574    const struct gl_format_info *info = _mesa_get_format_info(format);
 575    return info->IsSRGBFormat ? GL_SRGB : GL_LINEAR;
 576 }
 577
 578
 579 /**
 580  * Return TRUE if format is an ETC2 compressed format specified
 581  * by GL_ARB_ES3_compatibility.
 582  */
 583 bool
 584 _mesa_is_format_etc2(mesa_format format)
 585 {
 586    switch (format) {
 587    case MESA_FORMAT_ETC2_RGB8:
 588    case MESA_FORMAT_ETC2_SRGB8:
 589    case MESA_FORMAT_ETC2_RGBA8_EAC:
 590    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 591    case MESA_FORMAT_ETC2_R11_EAC:
 592    case MESA_FORMAT_ETC2_RG11_EAC:
 593    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 594    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 595    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 596    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 597       return GL_TRUE;
 598    default:
 599       return GL_FALSE;
 600    }
 601 }
 602
 603
 604 /**
 605  * For an sRGB format, return the corresponding linear color space format.
 606  * For non-sRGB formats, return the format as-is.
 607  */
 608 mesa_format
 609 _mesa_get_srgb_format_linear(mesa_format format)
 610 {
 611    switch (format) {
 612    case MESA_FORMAT_BGR_SRGB8:
 613       format = MESA_FORMAT_BGR_UNORM8;
 614       break;
 615    case MESA_FORMAT_A8B8G8R8_SRGB:
 616       format = MESA_FORMAT_A8B8G8R8_UNORM;
 617       break;
 618    case MESA_FORMAT_B8G8R8A8_SRGB:
 619       format = MESA_FORMAT_B8G8R8A8_UNORM;
 620       break;
 621    case MESA_FORMAT_A8R8G8B8_SRGB:
 622       format = MESA_FORMAT_A8R8G8B8_UNORM;
 623       break;
 624    case MESA_FORMAT_R8G8B8A8_SRGB:
 625       format = MESA_FORMAT_R8G8B8A8_UNORM;
 626       break;
 627    case MESA_FORMAT_L_SRGB8:
 628       format = MESA_FORMAT_L_UNORM8;
 629       break;
 630    case MESA_FORMAT_L8A8_SRGB:
 631       format = MESA_FORMAT_L8A8_UNORM;
 632       break;
 633    case MESA_FORMAT_A8L8_SRGB:
 634       format = MESA_FORMAT_A8L8_UNORM;
 635       break;
 636    case MESA_FORMAT_SRGB_DXT1:
 637       format = MESA_FORMAT_RGB_DXT1;
 638       break;
 639    case MESA_FORMAT_SRGBA_DXT1:
 640       format = MESA_FORMAT_RGBA_DXT1;
 641       break;
 642    case MESA_FORMAT_SRGBA_DXT3:
 643       format = MESA_FORMAT_RGBA_DXT3;
 644       break;
 645    case MESA_FORMAT_SRGBA_DXT5:
 646       format = MESA_FORMAT_RGBA_DXT5;
 647       break;
 648    case MESA_FORMAT_R8G8B8X8_SRGB:
 649       format = MESA_FORMAT_R8G8B8X8_UNORM;
 650       break;
 651    case MESA_FORMAT_X8B8G8R8_SRGB:
 652       format = MESA_FORMAT_X8B8G8R8_UNORM;
 653       break;
 654    case MESA_FORMAT_ETC2_SRGB8:
 655       format = MESA_FORMAT_ETC2_RGB8;
 656       break;
 657    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 658       format = MESA_FORMAT_ETC2_RGBA8_EAC;
 659       break;
 660    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 661       format = MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1;
 662       break;
 663    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 664       format = MESA_FORMAT_BPTC_RGBA_UNORM;
 665       break;
 666    case MESA_FORMAT_B8G8R8X8_SRGB:
 667       format = MESA_FORMAT_B8G8R8X8_UNORM;
 668       break;
 669    case MESA_FORMAT_X8R8G8B8_SRGB:
 670       format = MESA_FORMAT_X8R8G8B8_UNORM;
 671       break;
 672    default:
 673       break;
 674    }
 675    return format;
 676 }
 677
 678
 679 /**
 680  * If the given format is a compressed format, return a corresponding
 681  * uncompressed format.
 682  */
 683 mesa_format
 684 _mesa_get_uncompressed_format(mesa_format format)
 685 {
 686    switch (format) {
 687    case MESA_FORMAT_RGB_FXT1:
 688       return MESA_FORMAT_BGR_UNORM8;
 689    case MESA_FORMAT_RGBA_FXT1:
 690       return MESA_FORMAT_A8B8G8R8_UNORM;
 691    case MESA_FORMAT_RGB_DXT1:
 692    case MESA_FORMAT_SRGB_DXT1:
 693       return MESA_FORMAT_BGR_UNORM8;
 694    case MESA_FORMAT_RGBA_DXT1:
 695    case MESA_FORMAT_SRGBA_DXT1:
 696       return MESA_FORMAT_A8B8G8R8_UNORM;
 697    case MESA_FORMAT_RGBA_DXT3:
 698    case MESA_FORMAT_SRGBA_DXT3:
 699       return MESA_FORMAT_A8B8G8R8_UNORM;
 700    case MESA_FORMAT_RGBA_DXT5:
 701    case MESA_FORMAT_SRGBA_DXT5:
 702       return MESA_FORMAT_A8B8G8R8_UNORM;
 703    case MESA_FORMAT_R_RGTC1_UNORM:
 704       return MESA_FORMAT_R_UNORM8;
 705    case MESA_FORMAT_R_RGTC1_SNORM:
 706       return MESA_FORMAT_R_SNORM8;
 707    case MESA_FORMAT_RG_RGTC2_UNORM:
 708       return MESA_FORMAT_R8G8_UNORM;
 709    case MESA_FORMAT_RG_RGTC2_SNORM:
 710       return MESA_FORMAT_R8G8_SNORM;
 711    case MESA_FORMAT_L_LATC1_UNORM:
 712       return MESA_FORMAT_L_UNORM8;
 713    case MESA_FORMAT_L_LATC1_SNORM:
 714       return MESA_FORMAT_L_SNORM8;
 715    case MESA_FORMAT_LA_LATC2_UNORM:
 716       return MESA_FORMAT_L8A8_UNORM;
 717    case MESA_FORMAT_LA_LATC2_SNORM:
 718       return MESA_FORMAT_L8A8_SNORM;
 719    case MESA_FORMAT_ETC1_RGB8:
 720    case MESA_FORMAT_ETC2_RGB8:
 721    case MESA_FORMAT_ETC2_SRGB8:
 722       return MESA_FORMAT_BGR_UNORM8;
 723    case MESA_FORMAT_ETC2_RGBA8_EAC:
 724    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 725    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 726    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 727       return MESA_FORMAT_A8B8G8R8_UNORM;
 728    case MESA_FORMAT_ETC2_R11_EAC:
 729    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 730       return MESA_FORMAT_R_UNORM16;
 731    case MESA_FORMAT_ETC2_RG11_EAC:
 732    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 733       return MESA_FORMAT_R16G16_UNORM;
 734    case MESA_FORMAT_BPTC_RGBA_UNORM:
 735    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 736       return MESA_FORMAT_A8B8G8R8_UNORM;
 737    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
 738    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
 739       return MESA_FORMAT_RGB_FLOAT32;
 740    default:
 741 #ifdef DEBUG
 742       assert(!_mesa_is_format_compressed(format));
 743 #endif
 744       return format;
 745    }
 746 }
 747
 748
 749 GLuint
 750 _mesa_format_num_components(mesa_format format)
 751 {
 752    const struct gl_format_info *info = _mesa_get_format_info(format);
 753    return ((info->RedBits > 0) +
 754            (info->GreenBits > 0) +
 755            (info->BlueBits > 0) +
 756            (info->AlphaBits > 0) +
 757            (info->LuminanceBits > 0) +
 758            (info->IntensityBits > 0) +
 759            (info->DepthBits > 0) +
 760            (info->StencilBits > 0));
 761 }
 762
 763
 764 /**
 765  * Returns true if a color format has data stored in the R/G/B/A channels,
 766  * given an index from 0 to 3.
 767  */
 768 bool
 769 _mesa_format_has_color_component(mesa_format format, int component)
 770 {
 771    const struct gl_format_info *info = _mesa_get_format_info(format);
 772
 773    assert(info->BaseFormat != GL_DEPTH_COMPONENT &&
 774           info->BaseFormat != GL_DEPTH_STENCIL &&
 775           info->BaseFormat != GL_STENCIL_INDEX);
 776
 777    switch (component) {
 778    case 0:
 779       return (info->RedBits + info->IntensityBits + info->LuminanceBits) > 0;
 780    case 1:
 781       return (info->GreenBits + info->IntensityBits + info->LuminanceBits) > 0;
 782    case 2:
 783       return (info->BlueBits + info->IntensityBits + info->LuminanceBits) > 0;
 784    case 3:
 785       return (info->AlphaBits + info->IntensityBits) > 0;
 786    default:
 787       assert(!"Invalid color component: must be 0..3");
 788       return false;
 789    }
 790 }
 791
 792
 793 /**
 794  * Return number of bytes needed to store an image of the given size
 795  * in the given format.
 796  */
 797 GLuint
 798 _mesa_format_image_size(mesa_format format, GLsizei width,
 799                         GLsizei height, GLsizei depth)
 800 {
 801    const struct gl_format_info *info = _mesa_get_format_info(format);
 802    /* Strictly speaking, a conditional isn't needed here */
 803    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 804       /* compressed format (2D only for now) */
 805       const GLuint bw = info->BlockWidth, bh = info->BlockHeight;
 806       const GLuint wblocks = (width + bw - 1) / bw;
 807       const GLuint hblocks = (height + bh - 1) / bh;
 808       const GLuint sz = wblocks * hblocks * info->BytesPerBlock;
 809       return sz * depth;
 810    }
 811    else {
 812       /* non-compressed */
 813       const GLuint sz = width * height * depth * info->BytesPerBlock;
 814       return sz;
 815    }
 816 }
 817
 818
 819 /**
 820  * Same as _mesa_format_image_size() but returns a 64-bit value to
 821  * accommodate very large textures.
 822  */
 823 uint64_t
 824 _mesa_format_image_size64(mesa_format format, GLsizei width,
 825                           GLsizei height, GLsizei depth)
 826 {
 827    const struct gl_format_info *info = _mesa_get_format_info(format);
 828    /* Strictly speaking, a conditional isn't needed here */
 829    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 830       /* compressed format (2D only for now) */
 831       const uint64_t bw = info->BlockWidth, bh = info->BlockHeight;
 832       const uint64_t wblocks = (width + bw - 1) / bw;
 833       const uint64_t hblocks = (height + bh - 1) / bh;
 834       const uint64_t sz = wblocks * hblocks * info->BytesPerBlock;
 835       return sz * depth;
 836    }
 837    else {
 838       /* non-compressed */
 839       const uint64_t sz = ((uint64_t) width *
 840                            (uint64_t) height *
 841                            (uint64_t) depth *
 842                            info->BytesPerBlock);
 843       return sz;
 844    }
 845 }
 846
 847
 848
 849 GLint
 850 _mesa_format_row_stride(mesa_format format, GLsizei width)
 851 {
 852    const struct gl_format_info *info = _mesa_get_format_info(format);
 853    /* Strictly speaking, a conditional isn't needed here */
 854    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 855       /* compressed format */
 856       const GLuint bw = info->BlockWidth;
 857       const GLuint wblocks = (width + bw - 1) / bw;
 858       const GLint stride = wblocks * info->BytesPerBlock;
 859       return stride;
 860    }
 861    else {
 862       const GLint stride = width * info->BytesPerBlock;
 863       return stride;
 864    }
 865 }
 866
 867
 868
 869 /**
 870  * Return datatype and number of components per texel for the given
 871  * uncompressed mesa_format. Only used for mipmap generation code.
 872  */
 873 void
 874 _mesa_uncompressed_format_to_type_and_comps(mesa_format format,
 875                                GLenum *datatype, GLuint *comps)
 876 {
 877    switch (format) {
 878    case MESA_FORMAT_A8B8G8R8_UNORM:
 879    case MESA_FORMAT_R8G8B8A8_UNORM:
 880    case MESA_FORMAT_B8G8R8A8_UNORM:
 881    case MESA_FORMAT_A8R8G8B8_UNORM:
 882    case MESA_FORMAT_X8B8G8R8_UNORM:
 883    case MESA_FORMAT_R8G8B8X8_UNORM:
 884    case MESA_FORMAT_B8G8R8X8_UNORM:
 885    case MESA_FORMAT_X8R8G8B8_UNORM:
 886       *datatype = GL_UNSIGNED_BYTE;
 887       *comps = 4;
 888       return;
 889    case MESA_FORMAT_BGR_UNORM8:
 890    case MESA_FORMAT_RGB_UNORM8:
 891       *datatype = GL_UNSIGNED_BYTE;
 892       *comps = 3;
 893       return;
 894    case MESA_FORMAT_B5G6R5_UNORM:
 895    case MESA_FORMAT_R5G6B5_UNORM:
 896       *datatype = GL_UNSIGNED_SHORT_5_6_5;
 897       *comps = 3;
 898       return;
 899
 900    case MESA_FORMAT_B4G4R4A4_UNORM:
 901    case MESA_FORMAT_A4R4G4B4_UNORM:
 902    case MESA_FORMAT_B4G4R4X4_UNORM:
 903       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 904       *comps = 4;
 905       return;
 906
 907    case MESA_FORMAT_B5G5R5A1_UNORM:
 908    case MESA_FORMAT_A1R5G5B5_UNORM:
 909    case MESA_FORMAT_B5G5R5X1_UNORM:
 910       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 911       *comps = 4;
 912       return;
 913
 914    case MESA_FORMAT_B10G10R10A2_UNORM:
 915       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
 916       *comps = 4;
 917       return;
 918
 919    case MESA_FORMAT_A1B5G5R5_UNORM:
 920       *datatype = GL_UNSIGNED_SHORT_5_5_5_1;
 921       *comps = 4;
 922       return;
 923
 924    case MESA_FORMAT_L4A4_UNORM:
 925       *datatype = MESA_UNSIGNED_BYTE_4_4;
 926       *comps = 2;
 927       return;
 928
 929    case MESA_FORMAT_L8A8_UNORM:
 930    case MESA_FORMAT_A8L8_UNORM:
 931    case MESA_FORMAT_R8G8_UNORM:
 932    case MESA_FORMAT_G8R8_UNORM:
 933       *datatype = GL_UNSIGNED_BYTE;
 934       *comps = 2;
 935       return;
 936
 937    case MESA_FORMAT_L16A16_UNORM:
 938    case MESA_FORMAT_A16L16_UNORM:
 939    case MESA_FORMAT_R16G16_UNORM:
 940    case MESA_FORMAT_G16R16_UNORM:
 941       *datatype = GL_UNSIGNED_SHORT;
 942       *comps = 2;
 943       return;
 944
 945    case MESA_FORMAT_R_UNORM16:
 946    case MESA_FORMAT_A_UNORM16:
 947    case MESA_FORMAT_L_UNORM16:
 948    case MESA_FORMAT_I_UNORM16:
 949       *datatype = GL_UNSIGNED_SHORT;
 950       *comps = 1;
 951       return;
 952
 953    case MESA_FORMAT_R3G3B2_UNORM:
 954       *datatype = GL_UNSIGNED_BYTE_2_3_3_REV;
 955       *comps = 3;
 956       return;
 957    case MESA_FORMAT_A4B4G4R4_UNORM:
 958       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 959       *comps = 4;
 960       return;
 961
 962    case MESA_FORMAT_R4G4B4A4_UNORM:
 963       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 964       *comps = 4;
 965       return;
 966    case MESA_FORMAT_R5G5B5A1_UNORM:
 967       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 968       *comps = 4;
 969       return;
 970    case MESA_FORMAT_A2B10G10R10_UNORM:
 971    case MESA_FORMAT_A2B10G10R10_UINT:
 972       *datatype = GL_UNSIGNED_INT_10_10_10_2;
 973       *comps = 4;
 974       return;
 975    case MESA_FORMAT_A2R10G10B10_UNORM:
 976    case MESA_FORMAT_A2R10G10B10_UINT:
 977       *datatype = GL_UNSIGNED_INT_10_10_10_2;
 978       *comps = 4;
 979       return;
 980
 981    case MESA_FORMAT_B2G3R3_UNORM:
 982       *datatype = GL_UNSIGNED_BYTE_3_3_2;
 983       *comps = 3;
 984       return;
 985
 986    case MESA_FORMAT_A_UNORM8:
 987    case MESA_FORMAT_L_UNORM8:
 988    case MESA_FORMAT_I_UNORM8:
 989    case MESA_FORMAT_R_UNORM8:
 990    case MESA_FORMAT_S_UINT8:
 991       *datatype = GL_UNSIGNED_BYTE;
 992       *comps = 1;
 993       return;
 994
 995    case MESA_FORMAT_YCBCR:
 996    case MESA_FORMAT_YCBCR_REV:
 997       *datatype = GL_UNSIGNED_SHORT;
 998       *comps = 2;
 999       return;
1000
1001    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1002       *datatype = GL_UNSIGNED_INT_24_8_MESA;
1003       *comps = 2;
1004       return;
1005
1006    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1007       *datatype = GL_UNSIGNED_INT_8_24_REV_MESA;
1008       *comps = 2;
1009       return;
1010
1011    case MESA_FORMAT_Z_UNORM16:
1012       *datatype = GL_UNSIGNED_SHORT;
1013       *comps = 1;
1014       return;
1015
1016    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1017       *datatype = GL_UNSIGNED_INT;
1018       *comps = 1;
1019       return;
1020
1021    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1022       *datatype = GL_UNSIGNED_INT;
1023       *comps = 1;
1024       return;
1025
1026    case MESA_FORMAT_Z_UNORM32:
1027       *datatype = GL_UNSIGNED_INT;
1028       *comps = 1;
1029       return;
1030
1031    case MESA_FORMAT_Z_FLOAT32:
1032       *datatype = GL_FLOAT;
1033       *comps = 1;
1034       return;
1035
1036    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
1037       *datatype = GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
1038       *comps = 1;
1039       return;
1040
1041    case MESA_FORMAT_R_SNORM8:
1042    case MESA_FORMAT_A_SNORM8:
1043    case MESA_FORMAT_L_SNORM8:
1044    case MESA_FORMAT_I_SNORM8:
1045       *datatype = GL_BYTE;
1046       *comps = 1;
1047       return;
1048    case MESA_FORMAT_R8G8_SNORM:
1049    case MESA_FORMAT_L8A8_SNORM:
1050    case MESA_FORMAT_A8L8_SNORM:
1051       *datatype = GL_BYTE;
1052       *comps = 2;
1053       return;
1054    case MESA_FORMAT_A8B8G8R8_SNORM:
1055    case MESA_FORMAT_R8G8B8A8_SNORM:
1056    case MESA_FORMAT_X8B8G8R8_SNORM:
1057       *datatype = GL_BYTE;
1058       *comps = 4;
1059       return;
1060
1061    case MESA_FORMAT_RGBA_UNORM16:
1062       *datatype = GL_UNSIGNED_SHORT;
1063       *comps = 4;
1064       return;
1065
1066    case MESA_FORMAT_R_SNORM16:
1067    case MESA_FORMAT_A_SNORM16:
1068    case MESA_FORMAT_L_SNORM16:
1069    case MESA_FORMAT_I_SNORM16:
1070       *datatype = GL_SHORT;
1071       *comps = 1;
1072       return;
1073    case MESA_FORMAT_R16G16_SNORM:
1074    case MESA_FORMAT_LA_SNORM16:
1075       *datatype = GL_SHORT;
1076       *comps = 2;
1077       return;
1078    case MESA_FORMAT_RGB_SNORM16:
1079       *datatype = GL_SHORT;
1080       *comps = 3;
1081       return;
1082    case MESA_FORMAT_RGBA_SNORM16:
1083       *datatype = GL_SHORT;
1084       *comps = 4;
1085       return;
1086
1087    case MESA_FORMAT_BGR_SRGB8:
1088       *datatype = GL_UNSIGNED_BYTE;
1089       *comps = 3;
1090       return;
1091    case MESA_FORMAT_A8B8G8R8_SRGB:
1092    case MESA_FORMAT_B8G8R8A8_SRGB:
1093    case MESA_FORMAT_A8R8G8B8_SRGB:
1094    case MESA_FORMAT_R8G8B8A8_SRGB:
1095       *datatype = GL_UNSIGNED_BYTE;
1096       *comps = 4;
1097       return;
1098    case MESA_FORMAT_L_SRGB8:
1099       *datatype = GL_UNSIGNED_BYTE;
1100       *comps = 1;
1101       return;
1102    case MESA_FORMAT_L8A8_SRGB:
1103    case MESA_FORMAT_A8L8_SRGB:
1104       *datatype = GL_UNSIGNED_BYTE;
1105       *comps = 2;
1106       return;
1107
1108    case MESA_FORMAT_RGBA_FLOAT32:
1109       *datatype = GL_FLOAT;
1110       *comps = 4;
1111       return;
1112    case MESA_FORMAT_RGBA_FLOAT16:
1113       *datatype = GL_HALF_FLOAT_ARB;
1114       *comps = 4;
1115       return;
1116    case MESA_FORMAT_RGB_FLOAT32:
1117       *datatype = GL_FLOAT;
1118       *comps = 3;
1119       return;
1120    case MESA_FORMAT_RGB_FLOAT16:
1121       *datatype = GL_HALF_FLOAT_ARB;
1122       *comps = 3;
1123       return;
1124    case MESA_FORMAT_LA_FLOAT32:
1125    case MESA_FORMAT_RG_FLOAT32:
1126       *datatype = GL_FLOAT;
1127       *comps = 2;
1128       return;
1129    case MESA_FORMAT_LA_FLOAT16:
1130    case MESA_FORMAT_RG_FLOAT16:
1131       *datatype = GL_HALF_FLOAT_ARB;
1132       *comps = 2;
1133       return;
1134    case MESA_FORMAT_A_FLOAT32:
1135    case MESA_FORMAT_L_FLOAT32:
1136    case MESA_FORMAT_I_FLOAT32:
1137    case MESA_FORMAT_R_FLOAT32:
1138       *datatype = GL_FLOAT;
1139       *comps = 1;
1140       return;
1141    case MESA_FORMAT_A_FLOAT16:
1142    case MESA_FORMAT_L_FLOAT16:
1143    case MESA_FORMAT_I_FLOAT16:
1144    case MESA_FORMAT_R_FLOAT16:
1145       *datatype = GL_HALF_FLOAT_ARB;
1146       *comps = 1;
1147       return;
1148
1149    case MESA_FORMAT_A_UINT8:
1150    case MESA_FORMAT_L_UINT8:
1151    case MESA_FORMAT_I_UINT8:
1152       *datatype = GL_UNSIGNED_BYTE;
1153       *comps = 1;
1154       return;
1155    case MESA_FORMAT_LA_UINT8:
1156       *datatype = GL_UNSIGNED_BYTE;
1157       *comps = 2;
1158       return;
1159
1160    case MESA_FORMAT_A_UINT16:
1161    case MESA_FORMAT_L_UINT16:
1162    case MESA_FORMAT_I_UINT16:
1163       *datatype = GL_UNSIGNED_SHORT;
1164       *comps = 1;
1165       return;
1166    case MESA_FORMAT_LA_UINT16:
1167       *datatype = GL_UNSIGNED_SHORT;
1168       *comps = 2;
1169       return;
1170    case MESA_FORMAT_A_UINT32:
1171    case MESA_FORMAT_L_UINT32:
1172    case MESA_FORMAT_I_UINT32:
1173       *datatype = GL_UNSIGNED_INT;
1174       *comps = 1;
1175       return;
1176    case MESA_FORMAT_LA_UINT32:
1177       *datatype = GL_UNSIGNED_INT;
1178       *comps = 2;
1179       return;
1180    case MESA_FORMAT_A_SINT8:
1181    case MESA_FORMAT_L_SINT8:
1182    case MESA_FORMAT_I_SINT8:
1183       *datatype = GL_BYTE;
1184       *comps = 1;
1185       return;
1186    case MESA_FORMAT_LA_SINT8:
1187       *datatype = GL_BYTE;
1188       *comps = 2;
1189       return;
1190
1191    case MESA_FORMAT_A_SINT16:
1192    case MESA_FORMAT_L_SINT16:
1193    case MESA_FORMAT_I_SINT16:
1194       *datatype = GL_SHORT;
1195       *comps = 1;
1196       return;
1197    case MESA_FORMAT_LA_SINT16:
1198       *datatype = GL_SHORT;
1199       *comps = 2;
1200       return;
1201
1202    case MESA_FORMAT_A_SINT32:
1203    case MESA_FORMAT_L_SINT32:
1204    case MESA_FORMAT_I_SINT32:
1205       *datatype = GL_INT;
1206       *comps = 1;
1207       return;
1208    case MESA_FORMAT_LA_SINT32:
1209       *datatype = GL_INT;
1210       *comps = 2;
1211       return;
1212
1213    case MESA_FORMAT_R_SINT8:
1214       *datatype = GL_BYTE;
1215       *comps = 1;
1216       return;
1217    case MESA_FORMAT_RG_SINT8:
1218       *datatype = GL_BYTE;
1219       *comps = 2;
1220       return;
1221    case MESA_FORMAT_RGB_SINT8:
1222       *datatype = GL_BYTE;
1223       *comps = 3;
1224       return;
1225    case MESA_FORMAT_RGBA_SINT8:
1226       *datatype = GL_BYTE;
1227       *comps = 4;
1228       return;
1229    case MESA_FORMAT_R_SINT16:
1230       *datatype = GL_SHORT;
1231       *comps = 1;
1232       return;
1233    case MESA_FORMAT_RG_SINT16:
1234       *datatype = GL_SHORT;
1235       *comps = 2;
1236       return;
1237    case MESA_FORMAT_RGB_SINT16:
1238       *datatype = GL_SHORT;
1239       *comps = 3;
1240       return;
1241    case MESA_FORMAT_RGBA_SINT16:
1242       *datatype = GL_SHORT;
1243       *comps = 4;
1244       return;
1245    case MESA_FORMAT_R_SINT32:
1246       *datatype = GL_INT;
1247       *comps = 1;
1248       return;
1249    case MESA_FORMAT_RG_SINT32:
1250       *datatype = GL_INT;
1251       *comps = 2;
1252       return;
1253    case MESA_FORMAT_RGB_SINT32:
1254       *datatype = GL_INT;
1255       *comps = 3;
1256       return;
1257    case MESA_FORMAT_RGBA_SINT32:
1258       *datatype = GL_INT;
1259       *comps = 4;
1260       return;
1261
1262    /**
1263     * \name Non-normalized unsigned integer formats.
1264     */
1265    case MESA_FORMAT_R_UINT8:
1266       *datatype = GL_UNSIGNED_BYTE;
1267       *comps = 1;
1268       return;
1269    case MESA_FORMAT_RG_UINT8:
1270       *datatype = GL_UNSIGNED_BYTE;
1271       *comps = 2;
1272       return;
1273    case MESA_FORMAT_RGB_UINT8:
1274       *datatype = GL_UNSIGNED_BYTE;
1275       *comps = 3;
1276       return;
1277    case MESA_FORMAT_RGBA_UINT8:
1278       *datatype = GL_UNSIGNED_BYTE;
1279       *comps = 4;
1280       return;
1281    case MESA_FORMAT_R_UINT16:
1282       *datatype = GL_UNSIGNED_SHORT;
1283       *comps = 1;
1284       return;
1285    case MESA_FORMAT_RG_UINT16:
1286       *datatype = GL_UNSIGNED_SHORT;
1287       *comps = 2;
1288       return;
1289    case MESA_FORMAT_RGB_UINT16:
1290       *datatype = GL_UNSIGNED_SHORT;
1291       *comps = 3;
1292       return;
1293    case MESA_FORMAT_RGBA_UINT16:
1294       *datatype = GL_UNSIGNED_SHORT;
1295       *comps = 4;
1296       return;
1297    case MESA_FORMAT_R_UINT32:
1298       *datatype = GL_UNSIGNED_INT;
1299       *comps = 1;
1300       return;
1301    case MESA_FORMAT_RG_UINT32:
1302       *datatype = GL_UNSIGNED_INT;
1303       *comps = 2;
1304       return;
1305    case MESA_FORMAT_RGB_UINT32:
1306       *datatype = GL_UNSIGNED_INT;
1307       *comps = 3;
1308       return;
1309    case MESA_FORMAT_RGBA_UINT32:
1310       *datatype = GL_UNSIGNED_INT;
1311       *comps = 4;
1312       return;
1313
1314    case MESA_FORMAT_R9G9B9E5_FLOAT:
1315       *datatype = GL_UNSIGNED_INT_5_9_9_9_REV;
1316       *comps = 3;
1317       return;
1318
1319    case MESA_FORMAT_R11G11B10_FLOAT:
1320       *datatype = GL_UNSIGNED_INT_10F_11F_11F_REV;
1321       *comps = 3;
1322       return;
1323
1324    case MESA_FORMAT_B10G10R10A2_UINT:
1325    case MESA_FORMAT_R10G10B10A2_UINT:
1326       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1327       *comps = 4;
1328       return;
1329
1330    case MESA_FORMAT_R8G8B8X8_SRGB:
1331    case MESA_FORMAT_X8B8G8R8_SRGB:
1332    case MESA_FORMAT_RGBX_UINT8:
1333       *datatype = GL_UNSIGNED_BYTE;
1334       *comps = 4;
1335       return;
1336
1337    case MESA_FORMAT_R8G8B8X8_SNORM:
1338    case MESA_FORMAT_RGBX_SINT8:
1339       *datatype = GL_BYTE;
1340       *comps = 4;
1341       return;
1342
1343    case MESA_FORMAT_B10G10R10X2_UNORM:
1344    case MESA_FORMAT_R10G10B10X2_UNORM:
1345       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1346       *comps = 4;
1347       return;
1348
1349    case MESA_FORMAT_RGBX_UNORM16:
1350    case MESA_FORMAT_RGBX_UINT16:
1351       *datatype = GL_UNSIGNED_SHORT;
1352       *comps = 4;
1353       return;
1354
1355    case MESA_FORMAT_RGBX_SNORM16:
1356    case MESA_FORMAT_RGBX_SINT16:
1357       *datatype = GL_SHORT;
1358       *comps = 4;
1359       return;
1360
1361    case MESA_FORMAT_RGBX_FLOAT16:
1362       *datatype = GL_HALF_FLOAT;
1363       *comps = 4;
1364       return;
1365
1366    case MESA_FORMAT_RGBX_FLOAT32:
1367       *datatype = GL_FLOAT;
1368       *comps = 4;
1369       return;
1370
1371    case MESA_FORMAT_RGBX_UINT32:
1372       *datatype = GL_UNSIGNED_INT;
1373       *comps = 4;
1374       return;
1375
1376    case MESA_FORMAT_RGBX_SINT32:
1377       *datatype = GL_INT;
1378       *comps = 4;
1379       return;
1380
1381    case MESA_FORMAT_R10G10B10A2_UNORM:
1382       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1383       *comps = 4;
1384       return;
1385
1386    case MESA_FORMAT_G8R8_SNORM:
1387       *datatype = GL_BYTE;
1388       *comps = 2;
1389       return;
1390
1391    case MESA_FORMAT_G16R16_SNORM:
1392       *datatype = GL_SHORT;
1393       *comps = 2;
1394       return;
1395
1396    case MESA_FORMAT_B8G8R8X8_SRGB:
1397    case MESA_FORMAT_X8R8G8B8_SRGB:
1398       *datatype = GL_UNSIGNED_BYTE;
1399       *comps = 4;
1400       return;
1401
1402    case MESA_FORMAT_COUNT:
1403       assert(0);
1404       return;
1405    default:
1406       /* Warn if any formats are not handled */
1407       _mesa_problem(NULL, "bad format %s in _mesa_uncompressed_format_to_type_and_comps",
1408                     _mesa_get_format_name(format));
1409       assert(format == MESA_FORMAT_NONE ||
1410              _mesa_is_format_compressed(format));
1411       *datatype = 0;
1412       *comps = 1;
1413    }
1414 }
1415
1416 /**
1417  * Check if a mesa_format exactly matches a GL format/type combination
1418  * such that we can use memcpy() from one to the other.
1419  * \param mesa_format  a MESA_FORMAT_x value
1420  * \param format  the user-specified image format
1421  * \param type  the user-specified image datatype
1422  * \param swapBytes  typically the current pixel pack/unpack byteswap state
1423  * \return GL_TRUE if the formats match, GL_FALSE otherwise.
1424  */
1425 GLboolean
1426 _mesa_format_matches_format_and_type(mesa_format mesa_format,
1427                                      GLenum format, GLenum type,
1428                                      GLboolean swapBytes)
1429 {
1430    const GLboolean littleEndian = _mesa_little_endian();
1431
1432    /* Note: When reading a GL format/type combination, the format lists channel
1433     * assignments from most significant channel in the type to least
1434     * significant.  A type with _REV indicates that the assignments are
1435     * swapped, so they are listed from least significant to most significant.
1436     *
1437     * For sanity, please keep this switch statement ordered the same as the
1438     * enums in formats.h.
1439     */
1440
1441    switch (mesa_format) {
1442
1443    case MESA_FORMAT_NONE:
1444    case MESA_FORMAT_COUNT:
1445       return GL_FALSE;
1446
1447    case MESA_FORMAT_A8B8G8R8_UNORM:
1448    case MESA_FORMAT_A8B8G8R8_SRGB:
1449       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1450          return GL_TRUE;
1451
1452       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
1453          return GL_TRUE;
1454
1455       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && !littleEndian)
1456          return GL_TRUE;
1457
1458       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV
1459           && !swapBytes)
1460          return GL_TRUE;
1461
1462       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8
1463           && swapBytes)
1464          return GL_TRUE;
1465
1466       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && littleEndian)
1467          return GL_TRUE;
1468
1469       return GL_FALSE;
1470
1471    case MESA_FORMAT_R8G8B8A8_UNORM:
1472    case MESA_FORMAT_R8G8B8A8_SRGB:
1473       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1474           !swapBytes)
1475          return GL_TRUE;
1476
1477       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1478          return GL_TRUE;
1479
1480       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && littleEndian)
1481          return GL_TRUE;
1482
1483       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8 &&
1484           !swapBytes)
1485          return GL_TRUE;
1486
1487       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1488           swapBytes)
1489          return GL_TRUE;
1490
1491       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && !littleEndian)
1492          return GL_TRUE;
1493
1494       return GL_FALSE;
1495
1496    case MESA_FORMAT_B8G8R8A8_UNORM:
1497    case MESA_FORMAT_B8G8R8A8_SRGB:
1498       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1499           !swapBytes)
1500          return GL_TRUE;
1501
1502       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1503          return GL_TRUE;
1504
1505       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && littleEndian)
1506          return GL_TRUE;
1507
1508       return GL_FALSE;
1509
1510    case MESA_FORMAT_A8R8G8B8_UNORM:
1511    case MESA_FORMAT_A8R8G8B8_SRGB:
1512       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1513          return GL_TRUE;
1514
1515       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1516           swapBytes)
1517          return GL_TRUE;
1518
1519       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && !littleEndian)
1520          return GL_TRUE;
1521
1522       return GL_FALSE;
1523
1524    case MESA_FORMAT_X8B8G8R8_UNORM:
1525    case MESA_FORMAT_R8G8B8X8_UNORM:
1526       return GL_FALSE;
1527
1528    case MESA_FORMAT_B8G8R8X8_UNORM:
1529    case MESA_FORMAT_X8R8G8B8_UNORM:
1530       return GL_FALSE;
1531
1532    case MESA_FORMAT_BGR_UNORM8:
1533    case MESA_FORMAT_BGR_SRGB8:
1534       return format == GL_BGR && type == GL_UNSIGNED_BYTE && littleEndian;
1535
1536    case MESA_FORMAT_RGB_UNORM8:
1537       return format == GL_RGB && type == GL_UNSIGNED_BYTE && littleEndian;
1538
1539    case MESA_FORMAT_B5G6R5_UNORM:
1540       return ((format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) ||
1541               (format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1542               !swapBytes;
1543
1544    case MESA_FORMAT_R5G6B5_UNORM:
1545       return ((format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5) ||
1546               (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1547               !swapBytes;
1548
1549    case MESA_FORMAT_B4G4R4A4_UNORM:
1550       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
1551          !swapBytes;
1552
1553    case MESA_FORMAT_A4R4G4B4_UNORM:
1554       return GL_FALSE;
1555
1556    case MESA_FORMAT_A1B5G5R5_UNORM:
1557       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1558          !swapBytes;
1559
1560    case MESA_FORMAT_B5G5R5A1_UNORM:
1561       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
1562          !swapBytes;
1563
1564    case MESA_FORMAT_A1R5G5B5_UNORM:
1565       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1566          !swapBytes;
1567
1568    case MESA_FORMAT_L4A4_UNORM:
1569       return GL_FALSE;
1570    case MESA_FORMAT_L8A8_UNORM:
1571    case MESA_FORMAT_L8A8_SRGB:
1572       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_BYTE && littleEndian;
1573    case MESA_FORMAT_A8L8_UNORM:
1574    case MESA_FORMAT_A8L8_SRGB:
1575       return GL_FALSE;
1576
1577    case MESA_FORMAT_L16A16_UNORM:
1578       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_SHORT && littleEndian && !swapBytes;
1579    case MESA_FORMAT_A16L16_UNORM:
1580       return GL_FALSE;
1581
1582    case MESA_FORMAT_B2G3R3_UNORM:
1583       return format == GL_RGB && type == GL_UNSIGNED_BYTE_3_3_2;
1584
1585    case MESA_FORMAT_R3G3B2_UNORM:
1586       return format == GL_RGB && type == GL_UNSIGNED_BYTE_2_3_3_REV;
1587
1588    case MESA_FORMAT_A4B4G4R4_UNORM:
1589       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1590          return GL_TRUE;
1591
1592       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1593          return GL_TRUE;
1594
1595       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1596          return GL_TRUE;
1597
1598       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1599          return GL_TRUE;
1600
1601       return GL_FALSE;
1602
1603    case MESA_FORMAT_R4G4B4A4_UNORM:
1604       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1605          return GL_TRUE;
1606
1607       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1608          return GL_TRUE;
1609
1610       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1611          return GL_TRUE;
1612
1613       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1614          return GL_TRUE;
1615
1616       return GL_FALSE;
1617
1618    case MESA_FORMAT_R5G5B5A1_UNORM:
1619       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
1620
1621    case MESA_FORMAT_A2B10G10R10_UNORM:
1622       return format == GL_RGBA && type == GL_UNSIGNED_INT_10_10_10_2;
1623
1624    case MESA_FORMAT_A2B10G10R10_UINT:
1625       return format == GL_RGBA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1626
1627    case MESA_FORMAT_A2R10G10B10_UNORM:
1628       return format == GL_BGRA && type == GL_UNSIGNED_INT_10_10_10_2;
1629
1630    case MESA_FORMAT_A2R10G10B10_UINT:
1631       return format == GL_BGRA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1632
1633    case MESA_FORMAT_A_UNORM8:
1634       return format == GL_ALPHA && type == GL_UNSIGNED_BYTE;
1635    case MESA_FORMAT_A_UNORM16:
1636       return format == GL_ALPHA && type == GL_UNSIGNED_SHORT && !swapBytes;
1637    case MESA_FORMAT_L_UNORM8:
1638    case MESA_FORMAT_L_SRGB8:
1639       return format == GL_LUMINANCE && type == GL_UNSIGNED_BYTE;
1640    case MESA_FORMAT_L_UNORM16:
1641       return format == GL_LUMINANCE && type == GL_UNSIGNED_SHORT && !swapBytes;
1642    case MESA_FORMAT_I_UNORM8:
1643       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1644    case MESA_FORMAT_I_UNORM16:
1645       return format == GL_RED && type == GL_UNSIGNED_SHORT && !swapBytes;
1646
1647    case MESA_FORMAT_YCBCR:
1648       return format == GL_YCBCR_MESA &&
1649              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian != swapBytes) ||
1650               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian == swapBytes));
1651    case MESA_FORMAT_YCBCR_REV:
1652       return format == GL_YCBCR_MESA &&
1653              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian == swapBytes) ||
1654               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian != swapBytes));
1655
1656    case MESA_FORMAT_R_UNORM8:
1657       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1658    case MESA_FORMAT_R8G8_UNORM:
1659       return format == GL_RG && type == GL_UNSIGNED_BYTE && littleEndian;
1660    case MESA_FORMAT_G8R8_UNORM:
1661       return GL_FALSE;
1662
1663    case MESA_FORMAT_R_UNORM16:
1664       return format == GL_RED && type == GL_UNSIGNED_SHORT &&
1665          !swapBytes;
1666    case MESA_FORMAT_R16G16_UNORM:
1667       return format == GL_RG && type == GL_UNSIGNED_SHORT && littleEndian &&
1668          !swapBytes;
1669    case MESA_FORMAT_G16R16_UNORM:
1670       return GL_FALSE;
1671
1672    case MESA_FORMAT_B10G10R10A2_UNORM:
1673       return format == GL_BGRA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1674          !swapBytes;
1675
1676    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1677       return format == GL_DEPTH_STENCIL && type == GL_UNSIGNED_INT_24_8 &&
1678          !swapBytes;
1679    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1680    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1681       return GL_FALSE;
1682
1683    case MESA_FORMAT_Z_UNORM16:
1684       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_SHORT &&
1685          !swapBytes;
1686
1687    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1688       return GL_FALSE;
1689
1690    case MESA_FORMAT_Z_UNORM32:
1691       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_INT &&
1692          !swapBytes;
1693
1694    case MESA_FORMAT_S_UINT8:
1695       return format == GL_STENCIL_INDEX && type == GL_UNSIGNED_BYTE;
1696
1697    case MESA_FORMAT_SRGB_DXT1:
1698    case MESA_FORMAT_SRGBA_DXT1:
1699    case MESA_FORMAT_SRGBA_DXT3:
1700    case MESA_FORMAT_SRGBA_DXT5:
1701       return GL_FALSE;
1702
1703    case MESA_FORMAT_RGB_FXT1:
1704    case MESA_FORMAT_RGBA_FXT1:
1705    case MESA_FORMAT_RGB_DXT1:
1706    case MESA_FORMAT_RGBA_DXT1:
1707    case MESA_FORMAT_RGBA_DXT3:
1708    case MESA_FORMAT_RGBA_DXT5:
1709       return GL_FALSE;
1710
1711    case MESA_FORMAT_BPTC_RGBA_UNORM:
1712    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
1713    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
1714    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
1715       return GL_FALSE;
1716
1717    case MESA_FORMAT_RGBA_FLOAT32:
1718       return format == GL_RGBA && type == GL_FLOAT && !swapBytes;
1719    case MESA_FORMAT_RGBA_FLOAT16:
1720       return format == GL_RGBA && type == GL_HALF_FLOAT && !swapBytes;
1721
1722    case MESA_FORMAT_RGB_FLOAT32:
1723       return format == GL_RGB && type == GL_FLOAT && !swapBytes;
1724    case MESA_FORMAT_RGB_FLOAT16:
1725       return format == GL_RGB && type == GL_HALF_FLOAT && !swapBytes;
1726
1727    case MESA_FORMAT_A_FLOAT32:
1728       return format == GL_ALPHA && type == GL_FLOAT && !swapBytes;
1729    case MESA_FORMAT_A_FLOAT16:
1730       return format == GL_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1731
1732    case MESA_FORMAT_L_FLOAT32:
1733       return format == GL_LUMINANCE && type == GL_FLOAT && !swapBytes;
1734    case MESA_FORMAT_L_FLOAT16:
1735       return format == GL_LUMINANCE && type == GL_HALF_FLOAT && !swapBytes;
1736
1737    case MESA_FORMAT_LA_FLOAT32:
1738       return format == GL_LUMINANCE_ALPHA && type == GL_FLOAT && !swapBytes;
1739    case MESA_FORMAT_LA_FLOAT16:
1740       return format == GL_LUMINANCE_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1741
1742    case MESA_FORMAT_I_FLOAT32:
1743       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1744    case MESA_FORMAT_I_FLOAT16:
1745       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1746
1747    case MESA_FORMAT_R_FLOAT32:
1748       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1749    case MESA_FORMAT_R_FLOAT16:
1750       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1751
1752    case MESA_FORMAT_RG_FLOAT32:
1753       return format == GL_RG && type == GL_FLOAT && !swapBytes;
1754    case MESA_FORMAT_RG_FLOAT16:
1755       return format == GL_RG && type == GL_HALF_FLOAT && !swapBytes;
1756
1757    case MESA_FORMAT_A_UINT8:
1758       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_BYTE;
1759    case MESA_FORMAT_A_UINT16:
1760       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_SHORT &&
1761              !swapBytes;
1762    case MESA_FORMAT_A_UINT32:
1763       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_INT &&
1764              !swapBytes;
1765    case MESA_FORMAT_A_SINT8:
1766       return format == GL_ALPHA_INTEGER && type == GL_BYTE;
1767    case MESA_FORMAT_A_SINT16:
1768       return format == GL_ALPHA_INTEGER && type == GL_SHORT && !swapBytes;
1769    case MESA_FORMAT_A_SINT32:
1770       return format == GL_ALPHA_INTEGER && type == GL_INT && !swapBytes;
1771
1772    case MESA_FORMAT_I_UINT8:
1773       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1774    case MESA_FORMAT_I_UINT16:
1775       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1776    case MESA_FORMAT_I_UINT32:
1777       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1778    case MESA_FORMAT_I_SINT8:
1779       return format == GL_RED_INTEGER && type == GL_BYTE;
1780    case MESA_FORMAT_I_SINT16:
1781       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1782    case MESA_FORMAT_I_SINT32:
1783       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1784
1785    case MESA_FORMAT_L_UINT8:
1786       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_BYTE;
1787    case MESA_FORMAT_L_UINT16:
1788       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_SHORT &&
1789              !swapBytes;
1790    case MESA_FORMAT_L_UINT32:
1791       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_INT &&
1792              !swapBytes;
1793    case MESA_FORMAT_L_SINT8:
1794       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_BYTE;
1795    case MESA_FORMAT_L_SINT16:
1796       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_SHORT &&
1797              !swapBytes;
1798    case MESA_FORMAT_L_SINT32:
1799       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_INT && !swapBytes;
1800
1801    case MESA_FORMAT_LA_UINT8:
1802       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1803              type == GL_UNSIGNED_BYTE && !swapBytes;
1804    case MESA_FORMAT_LA_UINT16:
1805       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1806              type == GL_UNSIGNED_SHORT && !swapBytes;
1807    case MESA_FORMAT_LA_UINT32:
1808       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1809              type == GL_UNSIGNED_INT && !swapBytes;
1810    case MESA_FORMAT_LA_SINT8:
1811       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_BYTE &&
1812              !swapBytes;
1813    case MESA_FORMAT_LA_SINT16:
1814       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_SHORT &&
1815              !swapBytes;
1816    case MESA_FORMAT_LA_SINT32:
1817       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_INT &&
1818              !swapBytes;
1819
1820    case MESA_FORMAT_R_SINT8:
1821       return format == GL_RED_INTEGER && type == GL_BYTE;
1822    case MESA_FORMAT_RG_SINT8:
1823       return format == GL_RG_INTEGER && type == GL_BYTE && !swapBytes;
1824    case MESA_FORMAT_RGB_SINT8:
1825       return format == GL_RGB_INTEGER && type == GL_BYTE && !swapBytes;
1826    case MESA_FORMAT_RGBA_SINT8:
1827       return format == GL_RGBA_INTEGER && type == GL_BYTE && !swapBytes;
1828    case MESA_FORMAT_R_SINT16:
1829       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1830    case MESA_FORMAT_RG_SINT16:
1831       return format == GL_RG_INTEGER && type == GL_SHORT && !swapBytes;
1832    case MESA_FORMAT_RGB_SINT16:
1833       return format == GL_RGB_INTEGER && type == GL_SHORT && !swapBytes;
1834    case MESA_FORMAT_RGBA_SINT16:
1835       return format == GL_RGBA_INTEGER && type == GL_SHORT && !swapBytes;
1836    case MESA_FORMAT_R_SINT32:
1837       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1838    case MESA_FORMAT_RG_SINT32:
1839       return format == GL_RG_INTEGER && type == GL_INT && !swapBytes;
1840    case MESA_FORMAT_RGB_SINT32:
1841       return format == GL_RGB_INTEGER && type == GL_INT && !swapBytes;
1842    case MESA_FORMAT_RGBA_SINT32:
1843       return format == GL_RGBA_INTEGER && type == GL_INT && !swapBytes;
1844
1845    case MESA_FORMAT_R_UINT8:
1846       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1847    case MESA_FORMAT_RG_UINT8:
1848       return format == GL_RG_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1849    case MESA_FORMAT_RGB_UINT8:
1850       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1851    case MESA_FORMAT_RGBA_UINT8:
1852       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_BYTE &&
1853              !swapBytes;
1854    case MESA_FORMAT_R_UINT16:
1855       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT &&
1856              !swapBytes;
1857    case MESA_FORMAT_RG_UINT16:
1858       return format == GL_RG_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1859    case MESA_FORMAT_RGB_UINT16:
1860       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT &&
1861              !swapBytes;
1862    case MESA_FORMAT_RGBA_UINT16:
1863       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT &&
1864              !swapBytes;
1865    case MESA_FORMAT_R_UINT32:
1866       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1867    case MESA_FORMAT_RG_UINT32:
1868       return format == GL_RG_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1869    case MESA_FORMAT_RGB_UINT32:
1870       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1871    case MESA_FORMAT_RGBA_UINT32:
1872       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1873
1874    case MESA_FORMAT_R_SNORM8:
1875       return format == GL_RED && type == GL_BYTE;
1876    case MESA_FORMAT_R8G8_SNORM:
1877       return format == GL_RG && type == GL_BYTE && littleEndian &&
1878              !swapBytes;
1879    case MESA_FORMAT_X8B8G8R8_SNORM:
1880       return GL_FALSE;
1881
1882    case MESA_FORMAT_A8B8G8R8_SNORM:
1883       if (format == GL_RGBA && type == GL_BYTE && !littleEndian)
1884          return GL_TRUE;
1885
1886       if (format == GL_ABGR_EXT && type == GL_BYTE && littleEndian)
1887          return GL_TRUE;
1888
1889       return GL_FALSE;
1890
1891    case MESA_FORMAT_R8G8B8A8_SNORM:
1892       if (format == GL_RGBA && type == GL_BYTE && littleEndian)
1893          return GL_TRUE;
1894
1895       if (format == GL_ABGR_EXT && type == GL_BYTE && !littleEndian)
1896          return GL_TRUE;
1897
1898       return GL_FALSE;
1899
1900    case MESA_FORMAT_R_SNORM16:
1901       return format == GL_RED && type == GL_SHORT &&
1902              !swapBytes;
1903    case MESA_FORMAT_R16G16_SNORM:
1904       return format == GL_RG && type == GL_SHORT && littleEndian && !swapBytes;
1905    case MESA_FORMAT_RGB_SNORM16:
1906       return format == GL_RGB && type == GL_SHORT && !swapBytes;
1907    case MESA_FORMAT_RGBA_SNORM16:
1908       return format == GL_RGBA && type == GL_SHORT && !swapBytes;
1909    case MESA_FORMAT_RGBA_UNORM16:
1910       return format == GL_RGBA && type == GL_UNSIGNED_SHORT &&
1911              !swapBytes;
1912
1913    case MESA_FORMAT_R_RGTC1_UNORM:
1914    case MESA_FORMAT_R_RGTC1_SNORM:
1915    case MESA_FORMAT_RG_RGTC2_UNORM:
1916    case MESA_FORMAT_RG_RGTC2_SNORM:
1917       return GL_FALSE;
1918
1919    case MESA_FORMAT_L_LATC1_UNORM:
1920    case MESA_FORMAT_L_LATC1_SNORM:
1921    case MESA_FORMAT_LA_LATC2_UNORM:
1922    case MESA_FORMAT_LA_LATC2_SNORM:
1923       return GL_FALSE;
1924
1925    case MESA_FORMAT_ETC1_RGB8:
1926    case MESA_FORMAT_ETC2_RGB8:
1927    case MESA_FORMAT_ETC2_SRGB8:
1928    case MESA_FORMAT_ETC2_RGBA8_EAC:
1929    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
1930    case MESA_FORMAT_ETC2_R11_EAC:
1931    case MESA_FORMAT_ETC2_RG11_EAC:
1932    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
1933    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
1934    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
1935    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
1936       return GL_FALSE;
1937
1938    case MESA_FORMAT_A_SNORM8:
1939       return format == GL_ALPHA && type == GL_BYTE;
1940    case MESA_FORMAT_L_SNORM8:
1941       return format == GL_LUMINANCE && type == GL_BYTE;
1942    case MESA_FORMAT_L8A8_SNORM:
1943       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
1944              littleEndian && !swapBytes;
1945    case MESA_FORMAT_A8L8_SNORM:
1946       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
1947              !littleEndian && !swapBytes;
1948    case MESA_FORMAT_I_SNORM8:
1949       return format == GL_RED && type == GL_BYTE;
1950    case MESA_FORMAT_A_SNORM16:
1951       return format == GL_ALPHA && type == GL_SHORT && !swapBytes;
1952    case MESA_FORMAT_L_SNORM16:
1953       return format == GL_LUMINANCE && type == GL_SHORT && !swapBytes;
1954    case MESA_FORMAT_LA_SNORM16:
1955       return format == GL_LUMINANCE_ALPHA && type == GL_SHORT &&
1956              littleEndian && !swapBytes;
1957    case MESA_FORMAT_I_SNORM16:
1958       return format == GL_RED && type == GL_SHORT && littleEndian &&
1959              !swapBytes;
1960
1961    case MESA_FORMAT_B10G10R10A2_UINT:
1962       return (format == GL_BGRA_INTEGER_EXT &&
1963               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1964               !swapBytes);
1965
1966    case MESA_FORMAT_R10G10B10A2_UINT:
1967       return (format == GL_RGBA_INTEGER_EXT &&
1968               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1969               !swapBytes);
1970
1971    case MESA_FORMAT_R9G9B9E5_FLOAT:
1972       return format == GL_RGB && type == GL_UNSIGNED_INT_5_9_9_9_REV &&
1973          !swapBytes;
1974
1975    case MESA_FORMAT_R11G11B10_FLOAT:
1976       return format == GL_RGB && type == GL_UNSIGNED_INT_10F_11F_11F_REV &&
1977          !swapBytes;
1978
1979    case MESA_FORMAT_Z_FLOAT32:
1980       return format == GL_DEPTH_COMPONENT && type == GL_FLOAT && !swapBytes;
1981
1982    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
1983       return format == GL_DEPTH_STENCIL &&
1984              type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV && !swapBytes;
1985
1986    case MESA_FORMAT_B4G4R4X4_UNORM:
1987    case MESA_FORMAT_B5G5R5X1_UNORM:
1988    case MESA_FORMAT_R8G8B8X8_SNORM:
1989    case MESA_FORMAT_R8G8B8X8_SRGB:
1990    case MESA_FORMAT_X8B8G8R8_SRGB:
1991    case MESA_FORMAT_RGBX_UINT8:
1992    case MESA_FORMAT_RGBX_SINT8:
1993    case MESA_FORMAT_B10G10R10X2_UNORM:
1994    case MESA_FORMAT_R10G10B10X2_UNORM:
1995    case MESA_FORMAT_RGBX_UNORM16:
1996    case MESA_FORMAT_RGBX_SNORM16:
1997    case MESA_FORMAT_RGBX_FLOAT16:
1998    case MESA_FORMAT_RGBX_UINT16:
1999    case MESA_FORMAT_RGBX_SINT16:
2000    case MESA_FORMAT_RGBX_FLOAT32:
2001    case MESA_FORMAT_RGBX_UINT32:
2002    case MESA_FORMAT_RGBX_SINT32:
2003       return GL_FALSE;
2004
2005    case MESA_FORMAT_R10G10B10A2_UNORM:
2006       return format == GL_RGBA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2007          !swapBytes;
2008
2009    case MESA_FORMAT_G8R8_SNORM:
2010       return format == GL_RG && type == GL_BYTE && !littleEndian &&
2011          !swapBytes;
2012
2013    case MESA_FORMAT_G16R16_SNORM:
2014       return format == GL_RG && type == GL_SHORT && !littleEndian &&
2015          !swapBytes;
2016
2017    case MESA_FORMAT_B8G8R8X8_SRGB:
2018    case MESA_FORMAT_X8R8G8B8_SRGB:
2019       return GL_FALSE;
2020    }
2021
2022    return GL_FALSE;
2023 }
2024