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 "errors.h"
  28 #include "imports.h"
  29 #include "formats.h"
  30 #include "macros.h"
  31 #include "glformats.h"
  32 #include "c11/threads.h"
  33 #include "util/hash_table.h"
  34
  35 /**
  36  * Information about texture formats.
  37  */
  38 struct gl_format_info
  39 {
  40    mesa_format Name;
  41
  42    /** text name for debugging */
  43    const char *StrName;
  44
  45    enum mesa_format_layout Layout;
  46
  47    /**
  48     * Base format is one of GL_RED, GL_RG, GL_RGB, GL_RGBA, GL_ALPHA,
  49     * GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY, GL_YCBCR_MESA,
  50     * GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
  51     */
  52    GLenum BaseFormat;
  53
  54    /**
  55     * Logical data type: one of  GL_UNSIGNED_NORMALIZED, GL_SIGNED_NORMALIZED,
  56     * GL_UNSIGNED_INT, GL_INT, GL_FLOAT.
  57     */
  58    GLenum DataType;
  59
  60    GLubyte RedBits;
  61    GLubyte GreenBits;
  62    GLubyte BlueBits;
  63    GLubyte AlphaBits;
  64    GLubyte LuminanceBits;
  65    GLubyte IntensityBits;
  66    GLubyte DepthBits;
  67    GLubyte StencilBits;
  68
  69    bool IsSRGBFormat;
  70
  71    /**
  72     * To describe compressed formats.  If not compressed, Width=Height=Depth=1.
  73     */
  74    GLubyte BlockWidth, BlockHeight, BlockDepth;
  75    GLubyte BytesPerBlock;
  76
  77    uint8_t Swizzle[4];
  78    mesa_array_format ArrayFormat;
  79 };
  80
  81 #include "format_info.h"
  82
  83 static const struct gl_format_info *
  84 _mesa_get_format_info(mesa_format format)
  85 {
  86    const struct gl_format_info *info = &format_info[format];
  87    STATIC_ASSERT(ARRAY_SIZE(format_info) == MESA_FORMAT_COUNT);
  88    assert(info->Name == format);
  89    return info;
  90 }
  91
  92
  93 /** Return string name of format (for debugging) */
  94 const char *
  95 _mesa_get_format_name(mesa_format format)
  96 {
  97    const struct gl_format_info *info = _mesa_get_format_info(format);
  98    return info->StrName;
  99 }
 100
 101
 102
 103 /**
 104  * Return bytes needed to store a block of pixels in the given format.
 105  * Normally, a block is 1x1 (a single pixel).  But for compressed formats
 106  * a block may be 4x4 or 8x4, etc.
 107  *
 108  * Note: not GLuint, so as not to coerce math to unsigned. cf. fdo #37351
 109  */
 110 GLint
 111 _mesa_get_format_bytes(mesa_format format)
 112 {
 113    if (_mesa_format_is_mesa_array_format(format)) {
 114       return _mesa_array_format_get_type_size(format) *
 115              _mesa_array_format_get_num_channels(format);
 116    }
 117
 118    const struct gl_format_info *info = _mesa_get_format_info(format);
 119    assert(info->BytesPerBlock);
 120    assert(info->BytesPerBlock <= MAX_PIXEL_BYTES ||
 121           _mesa_is_format_compressed(format));
 122    return info->BytesPerBlock;
 123 }
 124
 125
 126 /**
 127  * Return bits per component for the given format.
 128  * \param format  one of MESA_FORMAT_x
 129  * \param pname  the component, such as GL_RED_BITS, GL_TEXTURE_BLUE_BITS, etc.
 130  */
 131 GLint
 132 _mesa_get_format_bits(mesa_format format, GLenum pname)
 133 {
 134    const struct gl_format_info *info = _mesa_get_format_info(format);
 135
 136    switch (pname) {
 137    case GL_RED_BITS:
 138    case GL_TEXTURE_RED_SIZE:
 139    case GL_RENDERBUFFER_RED_SIZE_EXT:
 140    case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
 141    case GL_INTERNALFORMAT_RED_SIZE:
 142       return info->RedBits;
 143    case GL_GREEN_BITS:
 144    case GL_TEXTURE_GREEN_SIZE:
 145    case GL_RENDERBUFFER_GREEN_SIZE_EXT:
 146    case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
 147    case GL_INTERNALFORMAT_GREEN_SIZE:
 148       return info->GreenBits;
 149    case GL_BLUE_BITS:
 150    case GL_TEXTURE_BLUE_SIZE:
 151    case GL_RENDERBUFFER_BLUE_SIZE_EXT:
 152    case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
 153    case GL_INTERNALFORMAT_BLUE_SIZE:
 154       return info->BlueBits;
 155    case GL_ALPHA_BITS:
 156    case GL_TEXTURE_ALPHA_SIZE:
 157    case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
 158    case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
 159    case GL_INTERNALFORMAT_ALPHA_SIZE:
 160       return info->AlphaBits;
 161    case GL_TEXTURE_INTENSITY_SIZE:
 162       return info->IntensityBits;
 163    case GL_TEXTURE_LUMINANCE_SIZE:
 164       return info->LuminanceBits;
 165    case GL_INDEX_BITS:
 166       return 0;
 167    case GL_DEPTH_BITS:
 168    case GL_TEXTURE_DEPTH_SIZE_ARB:
 169    case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
 170    case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
 171    case GL_INTERNALFORMAT_DEPTH_SIZE:
 172       return info->DepthBits;
 173    case GL_STENCIL_BITS:
 174    case GL_TEXTURE_STENCIL_SIZE_EXT:
 175    case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
 176    case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
 177    case GL_INTERNALFORMAT_STENCIL_SIZE:
 178       return info->StencilBits;
 179    default:
 180       _mesa_problem(NULL, "bad pname in _mesa_get_format_bits()");
 181       return 0;
 182    }
 183 }
 184
 185
 186 GLuint
 187 _mesa_get_format_max_bits(mesa_format format)
 188 {
 189    const struct gl_format_info *info = _mesa_get_format_info(format);
 190    GLuint max = MAX2(info->RedBits, info->GreenBits);
 191    max = MAX2(max, info->BlueBits);
 192    max = MAX2(max, info->AlphaBits);
 193    max = MAX2(max, info->LuminanceBits);
 194    max = MAX2(max, info->IntensityBits);
 195    max = MAX2(max, info->DepthBits);
 196    max = MAX2(max, info->StencilBits);
 197    return max;
 198 }
 199
 200
 201 /**
 202  * Return the layout type of the given format.
 203  */
 204 extern enum mesa_format_layout
 205 _mesa_get_format_layout(mesa_format format)
 206 {
 207    const struct gl_format_info *info = _mesa_get_format_info(format);
 208    return info->Layout;
 209 }
 210
 211
 212 /**
 213  * Return the data type (or more specifically, the data representation)
 214  * for the given format.
 215  * The return value will be one of:
 216  *    GL_UNSIGNED_NORMALIZED = unsigned int representing [0,1]
 217  *    GL_SIGNED_NORMALIZED = signed int representing [-1, 1]
 218  *    GL_UNSIGNED_INT = an ordinary unsigned integer
 219  *    GL_INT = an ordinary signed integer
 220  *    GL_FLOAT = an ordinary float
 221  */
 222 GLenum
 223 _mesa_get_format_datatype(mesa_format format)
 224 {
 225    const struct gl_format_info *info = _mesa_get_format_info(format);
 226    return info->DataType;
 227 }
 228
 229 static GLenum
 230 get_base_format_for_array_format(mesa_array_format format)
 231 {
 232    uint8_t swizzle[4];
 233    int num_channels;
 234
 235    _mesa_array_format_get_swizzle(format, swizzle);
 236    num_channels = _mesa_array_format_get_num_channels(format);
 237
 238    switch (num_channels) {
 239    case 4:
 240       /* FIXME: RGBX formats have 4 channels, but their base format is GL_RGB.
 241        * This is not really a problem for now because we only create array
 242        * formats from GL format/type combinations, and these cannot specify
 243        * RGBX formats.
 244        */
 245       return GL_RGBA;
 246    case 3:
 247       return GL_RGB;
 248    case 2:
 249       if (swizzle[0] == 0 &&
 250           swizzle[1] == 0 &&
 251           swizzle[2] == 0 &&
 252           swizzle[3] == 1)
 253          return GL_LUMINANCE_ALPHA;
 254       if (swizzle[0] == 1 &&
 255           swizzle[1] == 1 &&
 256           swizzle[2] == 1 &&
 257           swizzle[3] == 0)
 258          return GL_LUMINANCE_ALPHA;
 259       if (swizzle[0] == 0 &&
 260           swizzle[1] == 1 &&
 261           swizzle[2] == 4 &&
 262           swizzle[3] == 5)
 263          return GL_RG;
 264       if (swizzle[0] == 1 &&
 265           swizzle[1] == 0 &&
 266           swizzle[2] == 4 &&
 267           swizzle[3] == 5)
 268          return GL_RG;
 269       break;
 270    case 1:
 271       if (swizzle[0] == 0 &&
 272           swizzle[1] == 0 &&
 273           swizzle[2] == 0 &&
 274           swizzle[3] == 5)
 275          return GL_LUMINANCE;
 276       if (swizzle[0] == 0 &&
 277           swizzle[1] == 0 &&
 278           swizzle[2] == 0 &&
 279           swizzle[3] == 0)
 280          return GL_INTENSITY;
 281       if (swizzle[0] <= MESA_FORMAT_SWIZZLE_W)
 282          return GL_RED;
 283       if (swizzle[1] <= MESA_FORMAT_SWIZZLE_W)
 284          return GL_GREEN;
 285       if (swizzle[2] <= MESA_FORMAT_SWIZZLE_W)
 286          return GL_BLUE;
 287       if (swizzle[3] <= MESA_FORMAT_SWIZZLE_W)
 288          return GL_ALPHA;
 289       break;
 290    }
 291
 292    unreachable("Unsupported format");
 293 }
 294
 295 /**
 296  * Return the basic format for the given type.  The result will be one of
 297  * GL_RGB, GL_RGBA, GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY,
 298  * GL_YCBCR_MESA, GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
 299  * This functions accepts a mesa_format or a mesa_array_format.
 300  */
 301 GLenum
 302 _mesa_get_format_base_format(uint32_t format)
 303 {
 304    if (!_mesa_format_is_mesa_array_format(format)) {
 305       const struct gl_format_info *info = _mesa_get_format_info(format);
 306       return info->BaseFormat;
 307    } else {
 308       return get_base_format_for_array_format(format);
 309    }
 310 }
 311
 312
 313 /**
 314  * Return the block size (in pixels) for the given format.  Normally
 315  * the block size is 1x1.  But compressed formats will have block sizes
 316  * of 4x4 or 8x4 pixels, etc.
 317  * \param bw  returns block width in pixels
 318  * \param bh  returns block height in pixels
 319  */
 320 void
 321 _mesa_get_format_block_size(mesa_format format, GLuint *bw, GLuint *bh)
 322 {
 323    const struct gl_format_info *info = _mesa_get_format_info(format);
 324    /* Use _mesa_get_format_block_size_3d() for 3D blocks. */
 325    assert(info->BlockDepth == 1);
 326
 327    *bw = info->BlockWidth;
 328    *bh = info->BlockHeight;
 329 }
 330
 331
 332 /**
 333  * Return the block size (in pixels) for the given format. Normally
 334  * the block size is 1x1x1. But compressed formats will have block
 335  * sizes of 4x4x4, 3x3x3 pixels, etc.
 336  * \param bw  returns block width in pixels
 337  * \param bh  returns block height in pixels
 338  * \param bd  returns block depth in pixels
 339  */
 340 void
 341 _mesa_get_format_block_size_3d(mesa_format format,
 342                                GLuint *bw,
 343                                GLuint *bh,
 344                                GLuint *bd)
 345 {
 346    const struct gl_format_info *info = _mesa_get_format_info(format);
 347    *bw = info->BlockWidth;
 348    *bh = info->BlockHeight;
 349    *bd = info->BlockDepth;
 350 }
 351
 352
 353 /**
 354  * Returns the an array of four numbers representing the transformation
 355  * from the RGBA or SZ colorspace to the given format.  For array formats,
 356  * the i'th RGBA component is given by:
 357  *
 358  * if (swizzle[i] <= MESA_FORMAT_SWIZZLE_W)
 359  *    comp = data[swizzle[i]];
 360  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ZERO)
 361  *    comp = 0;
 362  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ONE)
 363  *    comp = 1;
 364  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_NONE)
 365  *    // data does not contain a channel of this format
 366  *
 367  * For packed formats, the swizzle gives the number of components left of
 368  * the least significant bit.
 369  *
 370  * Compressed formats have no swizzle.
 371  */
 372 void
 373 _mesa_get_format_swizzle(mesa_format format, uint8_t swizzle_out[4])
 374 {
 375    const struct gl_format_info *info = _mesa_get_format_info(format);
 376    memcpy(swizzle_out, info->Swizzle, sizeof(info->Swizzle));
 377 }
 378
 379 mesa_array_format
 380 _mesa_array_format_flip_channels(mesa_array_format format)
 381 {
 382    int num_channels;
 383    uint8_t swizzle[4];
 384
 385    num_channels = _mesa_array_format_get_num_channels(format);
 386    _mesa_array_format_get_swizzle(format, swizzle);
 387
 388    if (num_channels == 1)
 389       return format;
 390
 391    if (num_channels == 2) {
 392       /* Assert that the swizzle makes sense for 2 channels */
 393       for (unsigned i = 0; i < 4; i++)
 394          assert(swizzle[i] != 2 && swizzle[i] != 3);
 395
 396       static const uint8_t flip_xy[6] = { 1, 0, 2, 3, 4, 5 };
 397       _mesa_array_format_set_swizzle(&format,
 398                                      flip_xy[swizzle[0]], flip_xy[swizzle[1]],
 399                                      flip_xy[swizzle[2]], flip_xy[swizzle[3]]);
 400       return format;
 401    }
 402
 403    if (num_channels == 4) {
 404       static const uint8_t flip[6] = { 3, 2, 1, 0, 4, 5 };
 405       _mesa_array_format_set_swizzle(&format,
 406                                      flip[swizzle[0]], flip[swizzle[1]],
 407                                      flip[swizzle[2]], flip[swizzle[3]]);
 408       return format;
 409    }
 410
 411    unreachable("Invalid array format");
 412 }
 413
 414 uint32_t
 415 _mesa_format_to_array_format(mesa_format format)
 416 {
 417    const struct gl_format_info *info = _mesa_get_format_info(format);
 418    if (info->ArrayFormat && !_mesa_little_endian() &&
 419        info->Layout == MESA_FORMAT_LAYOUT_PACKED)
 420       return _mesa_array_format_flip_channels(info->ArrayFormat);
 421    else
 422       return info->ArrayFormat;
 423 }
 424
 425 static struct hash_table *format_array_format_table;
 426 static once_flag format_array_format_table_exists = ONCE_FLAG_INIT;
 427
 428 static bool
 429 array_formats_equal(const void *a, const void *b)
 430 {
 431    return (intptr_t)a == (intptr_t)b;
 432 }
 433
 434 static void
 435 format_array_format_table_init(void)
 436 {
 437    const struct gl_format_info *info;
 438    mesa_array_format array_format;
 439    unsigned f;
 440
 441    format_array_format_table = _mesa_hash_table_create(NULL, NULL,
 442                                                        array_formats_equal);
 443
 444    if (!format_array_format_table) {
 445       _mesa_error_no_memory(__func__);
 446       return;
 447    }
 448
 449    for (f = 1; f < MESA_FORMAT_COUNT; ++f) {
 450       info = _mesa_get_format_info(f);
 451       if (!info->ArrayFormat)
 452          continue;
 453
 454       if (_mesa_little_endian()) {
 455          array_format = info->ArrayFormat;
 456       } else {
 457          array_format = _mesa_array_format_flip_channels(info->ArrayFormat);
 458       }
 459
 460       /* This can happen and does for some of the BGR formats.  Let's take
 461        * the first one in the list.
 462        */
 463       if (_mesa_hash_table_search_pre_hashed(format_array_format_table,
 464                                              array_format,
 465                                              (void *)(intptr_t)array_format))
 466          continue;
 467
 468       _mesa_hash_table_insert_pre_hashed(format_array_format_table,
 469                                          array_format,
 470                                          (void *)(intptr_t)array_format,
 471                                          (void *)(intptr_t)f);
 472    }
 473 }
 474
 475 mesa_format
 476 _mesa_format_from_array_format(uint32_t array_format)
 477 {
 478    struct hash_entry *entry;
 479
 480    assert(_mesa_format_is_mesa_array_format(array_format));
 481
 482    call_once(&format_array_format_table_exists, format_array_format_table_init);
 483
 484    if (!format_array_format_table) {
 485       static const once_flag once_flag_init = ONCE_FLAG_INIT;
 486       format_array_format_table_exists = once_flag_init;
 487       return MESA_FORMAT_NONE;
 488    }
 489
 490    entry = _mesa_hash_table_search_pre_hashed(format_array_format_table,
 491                                               array_format,
 492                                               (void *)(intptr_t)array_format);
 493    if (entry)
 494       return (intptr_t)entry->data;
 495    else
 496       return MESA_FORMAT_NONE;
 497 }
 498
 499 /** Is the given format a compressed format? */
 500 GLboolean
 501 _mesa_is_format_compressed(mesa_format format)
 502 {
 503    const struct gl_format_info *info = _mesa_get_format_info(format);
 504    return info->BlockWidth > 1 || info->BlockHeight > 1;
 505 }
 506
 507
 508 /**
 509  * Determine if the given format represents a packed depth/stencil buffer.
 510  */
 511 GLboolean
 512 _mesa_is_format_packed_depth_stencil(mesa_format format)
 513 {
 514    const struct gl_format_info *info = _mesa_get_format_info(format);
 515
 516    return info->BaseFormat == GL_DEPTH_STENCIL;
 517 }
 518
 519
 520 /**
 521  * Is the given format a signed/unsigned integer color format?
 522  */
 523 GLboolean
 524 _mesa_is_format_integer_color(mesa_format format)
 525 {
 526    const struct gl_format_info *info = _mesa_get_format_info(format);
 527    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT) &&
 528       info->BaseFormat != GL_DEPTH_COMPONENT &&
 529       info->BaseFormat != GL_DEPTH_STENCIL &&
 530       info->BaseFormat != GL_STENCIL_INDEX;
 531 }
 532
 533
 534 /**
 535  * Is the given format an unsigned integer format?
 536  */
 537 GLboolean
 538 _mesa_is_format_unsigned(mesa_format format)
 539 {
 540    const struct gl_format_info *info = _mesa_get_format_info(format);
 541    return _mesa_is_type_unsigned(info->DataType);
 542 }
 543
 544
 545 /**
 546  * Does the given format store signed values?
 547  */
 548 GLboolean
 549 _mesa_is_format_signed(mesa_format format)
 550 {
 551    if (format == MESA_FORMAT_R11G11B10_FLOAT ||
 552        format == MESA_FORMAT_R9G9B9E5_FLOAT) {
 553       /* these packed float formats only store unsigned values */
 554       return GL_FALSE;
 555    }
 556    else {
 557       const struct gl_format_info *info = _mesa_get_format_info(format);
 558       return (info->DataType == GL_SIGNED_NORMALIZED ||
 559               info->DataType == GL_INT ||
 560               info->DataType == GL_FLOAT);
 561    }
 562 }
 563
 564 /**
 565  * Is the given format an integer format?
 566  */
 567 GLboolean
 568 _mesa_is_format_integer(mesa_format format)
 569 {
 570    const struct gl_format_info *info = _mesa_get_format_info(format);
 571    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT);
 572 }
 573
 574
 575 /**
 576  * Return true if the given format is a color format.
 577  */
 578 bool
 579 _mesa_is_format_color_format(mesa_format format)
 580 {
 581    const struct gl_format_info *info = _mesa_get_format_info(format);
 582    switch (info->BaseFormat) {
 583    case GL_DEPTH_COMPONENT:
 584    case GL_STENCIL_INDEX:
 585    case GL_DEPTH_STENCIL:
 586       return false;
 587    default:
 588       return true;
 589    }
 590 }
 591
 592
 593 /**
 594  * Return color encoding for given format.
 595  * \return GL_LINEAR or GL_SRGB
 596  */
 597 GLenum
 598 _mesa_get_format_color_encoding(mesa_format format)
 599 {
 600    const struct gl_format_info *info = _mesa_get_format_info(format);
 601    return info->IsSRGBFormat ? GL_SRGB : GL_LINEAR;
 602 }
 603
 604
 605 /**
 606  * Return TRUE if format is an ETC2 compressed format specified
 607  * by GL_ARB_ES3_compatibility.
 608  */
 609 bool
 610 _mesa_is_format_etc2(mesa_format format)
 611 {
 612    switch (format) {
 613    case MESA_FORMAT_ETC2_RGB8:
 614    case MESA_FORMAT_ETC2_SRGB8:
 615    case MESA_FORMAT_ETC2_RGBA8_EAC:
 616    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 617    case MESA_FORMAT_ETC2_R11_EAC:
 618    case MESA_FORMAT_ETC2_RG11_EAC:
 619    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 620    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 621    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 622    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 623       return GL_TRUE;
 624    default:
 625       return GL_FALSE;
 626    }
 627 }
 628
 629
 630 /**
 631  * Return TRUE if format is an ASTC 2D compressed format.
 632  */
 633 bool
 634 _mesa_is_format_astc_2d(mesa_format format)
 635 {
 636    switch (format) {
 637    case MESA_FORMAT_RGBA_ASTC_4x4:
 638    case MESA_FORMAT_RGBA_ASTC_5x4:
 639    case MESA_FORMAT_RGBA_ASTC_5x5:
 640    case MESA_FORMAT_RGBA_ASTC_6x5:
 641    case MESA_FORMAT_RGBA_ASTC_6x6:
 642    case MESA_FORMAT_RGBA_ASTC_8x5:
 643    case MESA_FORMAT_RGBA_ASTC_8x6:
 644    case MESA_FORMAT_RGBA_ASTC_8x8:
 645    case MESA_FORMAT_RGBA_ASTC_10x5:
 646    case MESA_FORMAT_RGBA_ASTC_10x6:
 647    case MESA_FORMAT_RGBA_ASTC_10x8:
 648    case MESA_FORMAT_RGBA_ASTC_10x10:
 649    case MESA_FORMAT_RGBA_ASTC_12x10:
 650    case MESA_FORMAT_RGBA_ASTC_12x12:
 651    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4:
 652    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x4:
 653    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5:
 654    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x5:
 655    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6:
 656    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x5:
 657    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x6:
 658    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x8:
 659    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x5:
 660    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x6:
 661    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x8:
 662    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x10:
 663    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x10:
 664    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x12:
 665       return true;
 666    default:
 667       return false;
 668    }
 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    case MESA_FORMAT_ATC_RGB:
 716       return MESA_FORMAT_BGR_UNORM8;
 717    case MESA_FORMAT_ETC2_RGBA8_EAC:
 718    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 719    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 720    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 721    case MESA_FORMAT_ATC_RGBA_EXPLICIT:
 722    case MESA_FORMAT_ATC_RGBA_INTERPOLATED:
 723       return MESA_FORMAT_A8B8G8R8_UNORM;
 724    case MESA_FORMAT_ETC2_R11_EAC:
 725    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 726       return MESA_FORMAT_R_UNORM16;
 727    case MESA_FORMAT_ETC2_RG11_EAC:
 728    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 729       return MESA_FORMAT_R16G16_UNORM;
 730    case MESA_FORMAT_BPTC_RGBA_UNORM:
 731    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 732       return MESA_FORMAT_A8B8G8R8_UNORM;
 733    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
 734    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
 735       return MESA_FORMAT_RGB_FLOAT32;
 736    default:
 737       assert(!_mesa_is_format_compressed(format));
 738       return format;
 739    }
 740 }
 741
 742
 743 GLuint
 744 _mesa_format_num_components(mesa_format format)
 745 {
 746    const struct gl_format_info *info = _mesa_get_format_info(format);
 747    return ((info->RedBits > 0) +
 748            (info->GreenBits > 0) +
 749            (info->BlueBits > 0) +
 750            (info->AlphaBits > 0) +
 751            (info->LuminanceBits > 0) +
 752            (info->IntensityBits > 0) +
 753            (info->DepthBits > 0) +
 754            (info->StencilBits > 0));
 755 }
 756
 757
 758 /**
 759  * Returns true if a color format has data stored in the R/G/B/A channels,
 760  * given an index from 0 to 3.
 761  */
 762 bool
 763 _mesa_format_has_color_component(mesa_format format, int component)
 764 {
 765    const struct gl_format_info *info = _mesa_get_format_info(format);
 766
 767    assert(info->BaseFormat != GL_DEPTH_COMPONENT &&
 768           info->BaseFormat != GL_DEPTH_STENCIL &&
 769           info->BaseFormat != GL_STENCIL_INDEX);
 770
 771    switch (component) {
 772    case 0:
 773       return (info->RedBits + info->IntensityBits + info->LuminanceBits) > 0;
 774    case 1:
 775       return (info->GreenBits + info->IntensityBits + info->LuminanceBits) > 0;
 776    case 2:
 777       return (info->BlueBits + info->IntensityBits + info->LuminanceBits) > 0;
 778    case 3:
 779       return (info->AlphaBits + info->IntensityBits) > 0;
 780    default:
 781       assert(!"Invalid color component: must be 0..3");
 782       return false;
 783    }
 784 }
 785
 786
 787 /**
 788  * Return number of bytes needed to store an image of the given size
 789  * in the given format.
 790  */
 791 GLuint
 792 _mesa_format_image_size(mesa_format format, GLsizei width,
 793                         GLsizei height, GLsizei depth)
 794 {
 795    const struct gl_format_info *info = _mesa_get_format_info(format);
 796    GLuint sz;
 797    /* Strictly speaking, a conditional isn't needed here */
 798    if (info->BlockWidth > 1 || info->BlockHeight > 1 || info->BlockDepth > 1) {
 799       /* compressed format (2D only for now) */
 800       const GLuint bw = info->BlockWidth;
 801       const GLuint bh = info->BlockHeight;
 802       const GLuint bd = info->BlockDepth;
 803       const GLuint wblocks = (width + bw - 1) / bw;
 804       const GLuint hblocks = (height + bh - 1) / bh;
 805       const GLuint dblocks = (depth + bd - 1) / bd;
 806       sz = wblocks * hblocks * dblocks * info->BytesPerBlock;
 807    } else
 808       /* non-compressed */
 809       sz = width * height * depth * info->BytesPerBlock;
 810
 811    return sz;
 812 }
 813
 814
 815 /**
 816  * Same as _mesa_format_image_size() but returns a 64-bit value to
 817  * accommodate very large textures.
 818  */
 819 uint64_t
 820 _mesa_format_image_size64(mesa_format format, GLsizei width,
 821                           GLsizei height, GLsizei depth)
 822 {
 823    const struct gl_format_info *info = _mesa_get_format_info(format);
 824    uint64_t sz;
 825    /* Strictly speaking, a conditional isn't needed here */
 826    if (info->BlockWidth > 1 || info->BlockHeight > 1 || info->BlockDepth > 1) {
 827       /* compressed format (2D only for now) */
 828       const uint64_t bw = info->BlockWidth;
 829       const uint64_t bh = info->BlockHeight;
 830       const uint64_t bd = info->BlockDepth;
 831       const uint64_t wblocks = (width + bw - 1) / bw;
 832       const uint64_t hblocks = (height + bh - 1) / bh;
 833       const uint64_t dblocks = (depth + bd - 1) / bd;
 834       sz = wblocks * hblocks * dblocks * info->BytesPerBlock;
 835    } else
 836       /* non-compressed */
 837       sz = ((uint64_t) width * (uint64_t) height *
 838             (uint64_t) depth * info->BytesPerBlock);
 839
 840    return sz;
 841 }
 842
 843
 844
 845 GLint
 846 _mesa_format_row_stride(mesa_format format, GLsizei width)
 847 {
 848    const struct gl_format_info *info = _mesa_get_format_info(format);
 849    /* Strictly speaking, a conditional isn't needed here */
 850    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 851       /* compressed format */
 852       const GLuint bw = info->BlockWidth;
 853       const GLuint wblocks = (width + bw - 1) / bw;
 854       const GLint stride = wblocks * info->BytesPerBlock;
 855       return stride;
 856    }
 857    else {
 858       const GLint stride = width * info->BytesPerBlock;
 859       return stride;
 860    }
 861 }
 862
 863
 864
 865 /**
 866  * Return datatype and number of components per texel for the given
 867  * uncompressed mesa_format. Only used for mipmap generation code.
 868  */
 869 void
 870 _mesa_uncompressed_format_to_type_and_comps(mesa_format format,
 871                                GLenum *datatype, GLuint *comps)
 872 {
 873    switch (format) {
 874    case MESA_FORMAT_A8B8G8R8_UNORM:
 875    case MESA_FORMAT_R8G8B8A8_UNORM:
 876    case MESA_FORMAT_B8G8R8A8_UNORM:
 877    case MESA_FORMAT_A8R8G8B8_UNORM:
 878    case MESA_FORMAT_X8B8G8R8_UNORM:
 879    case MESA_FORMAT_R8G8B8X8_UNORM:
 880    case MESA_FORMAT_B8G8R8X8_UNORM:
 881    case MESA_FORMAT_X8R8G8B8_UNORM:
 882    case MESA_FORMAT_A8B8G8R8_UINT:
 883    case MESA_FORMAT_R8G8B8A8_UINT:
 884    case MESA_FORMAT_B8G8R8A8_UINT:
 885    case MESA_FORMAT_A8R8G8B8_UINT:
 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    case MESA_FORMAT_B5G6R5_UINT:
 897    case MESA_FORMAT_R5G6B5_UINT:
 898       *datatype = GL_UNSIGNED_SHORT_5_6_5;
 899       *comps = 3;
 900       return;
 901
 902    case MESA_FORMAT_B4G4R4A4_UNORM:
 903    case MESA_FORMAT_A4R4G4B4_UNORM:
 904    case MESA_FORMAT_B4G4R4X4_UNORM:
 905    case MESA_FORMAT_B4G4R4A4_UINT:
 906    case MESA_FORMAT_A4R4G4B4_UINT:
 907       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 908       *comps = 4;
 909       return;
 910
 911    case MESA_FORMAT_B5G5R5A1_UNORM:
 912    case MESA_FORMAT_A1R5G5B5_UNORM:
 913    case MESA_FORMAT_B5G5R5X1_UNORM:
 914    case MESA_FORMAT_B5G5R5A1_UINT:
 915    case MESA_FORMAT_A1R5G5B5_UINT:
 916       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 917       *comps = 4;
 918       return;
 919
 920    case MESA_FORMAT_B10G10R10A2_UNORM:
 921       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
 922       *comps = 4;
 923       return;
 924
 925    case MESA_FORMAT_A1B5G5R5_UNORM:
 926    case MESA_FORMAT_A1B5G5R5_UINT:
 927    case MESA_FORMAT_X1B5G5R5_UNORM:
 928       *datatype = GL_UNSIGNED_SHORT_5_5_5_1;
 929       *comps = 4;
 930       return;
 931
 932    case MESA_FORMAT_L4A4_UNORM:
 933       *datatype = MESA_UNSIGNED_BYTE_4_4;
 934       *comps = 2;
 935       return;
 936
 937    case MESA_FORMAT_L8A8_UNORM:
 938    case MESA_FORMAT_A8L8_UNORM:
 939    case MESA_FORMAT_R8G8_UNORM:
 940    case MESA_FORMAT_G8R8_UNORM:
 941       *datatype = GL_UNSIGNED_BYTE;
 942       *comps = 2;
 943       return;
 944
 945    case MESA_FORMAT_L16A16_UNORM:
 946    case MESA_FORMAT_A16L16_UNORM:
 947    case MESA_FORMAT_R16G16_UNORM:
 948    case MESA_FORMAT_G16R16_UNORM:
 949       *datatype = GL_UNSIGNED_SHORT;
 950       *comps = 2;
 951       return;
 952
 953    case MESA_FORMAT_R_UNORM16:
 954    case MESA_FORMAT_A_UNORM16:
 955    case MESA_FORMAT_L_UNORM16:
 956    case MESA_FORMAT_I_UNORM16:
 957       *datatype = GL_UNSIGNED_SHORT;
 958       *comps = 1;
 959       return;
 960
 961    case MESA_FORMAT_R3G3B2_UNORM:
 962    case MESA_FORMAT_R3G3B2_UINT:
 963       *datatype = GL_UNSIGNED_BYTE_2_3_3_REV;
 964       *comps = 3;
 965       return;
 966    case MESA_FORMAT_A4B4G4R4_UNORM:
 967    case MESA_FORMAT_A4B4G4R4_UINT:
 968       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 969       *comps = 4;
 970       return;
 971
 972    case MESA_FORMAT_R4G4B4A4_UNORM:
 973    case MESA_FORMAT_R4G4B4A4_UINT:
 974       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 975       *comps = 4;
 976       return;
 977    case MESA_FORMAT_R5G5B5A1_UNORM:
 978    case MESA_FORMAT_R5G5B5A1_UINT:
 979       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 980       *comps = 4;
 981       return;
 982    case MESA_FORMAT_A2B10G10R10_UNORM:
 983    case MESA_FORMAT_A2B10G10R10_UINT:
 984       *datatype = GL_UNSIGNED_INT_10_10_10_2;
 985       *comps = 4;
 986       return;
 987    case MESA_FORMAT_A2R10G10B10_UNORM:
 988    case MESA_FORMAT_A2R10G10B10_UINT:
 989       *datatype = GL_UNSIGNED_INT_10_10_10_2;
 990       *comps = 4;
 991       return;
 992
 993    case MESA_FORMAT_B2G3R3_UNORM:
 994    case MESA_FORMAT_B2G3R3_UINT:
 995       *datatype = GL_UNSIGNED_BYTE_3_3_2;
 996       *comps = 3;
 997       return;
 998
 999    case MESA_FORMAT_A_UNORM8:
1000    case MESA_FORMAT_L_UNORM8:
1001    case MESA_FORMAT_I_UNORM8:
1002    case MESA_FORMAT_R_UNORM8:
1003    case MESA_FORMAT_S_UINT8:
1004       *datatype = GL_UNSIGNED_BYTE;
1005       *comps = 1;
1006       return;
1007
1008    case MESA_FORMAT_YCBCR:
1009    case MESA_FORMAT_YCBCR_REV:
1010       *datatype = GL_UNSIGNED_SHORT;
1011       *comps = 2;
1012       return;
1013
1014    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1015       *datatype = GL_UNSIGNED_INT_24_8_MESA;
1016       *comps = 2;
1017       return;
1018
1019    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1020       *datatype = GL_UNSIGNED_INT_8_24_REV_MESA;
1021       *comps = 2;
1022       return;
1023
1024    case MESA_FORMAT_Z_UNORM16:
1025       *datatype = GL_UNSIGNED_SHORT;
1026       *comps = 1;
1027       return;
1028
1029    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1030       *datatype = GL_UNSIGNED_INT;
1031       *comps = 1;
1032       return;
1033
1034    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1035       *datatype = GL_UNSIGNED_INT;
1036       *comps = 1;
1037       return;
1038
1039    case MESA_FORMAT_Z_UNORM32:
1040       *datatype = GL_UNSIGNED_INT;
1041       *comps = 1;
1042       return;
1043
1044    case MESA_FORMAT_Z_FLOAT32:
1045       *datatype = GL_FLOAT;
1046       *comps = 1;
1047       return;
1048
1049    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
1050       *datatype = GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
1051       *comps = 1;
1052       return;
1053
1054    case MESA_FORMAT_R_SNORM8:
1055    case MESA_FORMAT_A_SNORM8:
1056    case MESA_FORMAT_L_SNORM8:
1057    case MESA_FORMAT_I_SNORM8:
1058       *datatype = GL_BYTE;
1059       *comps = 1;
1060       return;
1061    case MESA_FORMAT_R8G8_SNORM:
1062    case MESA_FORMAT_L8A8_SNORM:
1063    case MESA_FORMAT_A8L8_SNORM:
1064       *datatype = GL_BYTE;
1065       *comps = 2;
1066       return;
1067    case MESA_FORMAT_A8B8G8R8_SNORM:
1068    case MESA_FORMAT_R8G8B8A8_SNORM:
1069    case MESA_FORMAT_X8B8G8R8_SNORM:
1070       *datatype = GL_BYTE;
1071       *comps = 4;
1072       return;
1073
1074    case MESA_FORMAT_RGBA_UNORM16:
1075       *datatype = GL_UNSIGNED_SHORT;
1076       *comps = 4;
1077       return;
1078
1079    case MESA_FORMAT_R_SNORM16:
1080    case MESA_FORMAT_A_SNORM16:
1081    case MESA_FORMAT_L_SNORM16:
1082    case MESA_FORMAT_I_SNORM16:
1083       *datatype = GL_SHORT;
1084       *comps = 1;
1085       return;
1086    case MESA_FORMAT_R16G16_SNORM:
1087    case MESA_FORMAT_LA_SNORM16:
1088       *datatype = GL_SHORT;
1089       *comps = 2;
1090       return;
1091    case MESA_FORMAT_RGB_SNORM16:
1092       *datatype = GL_SHORT;
1093       *comps = 3;
1094       return;
1095    case MESA_FORMAT_RGBA_SNORM16:
1096       *datatype = GL_SHORT;
1097       *comps = 4;
1098       return;
1099
1100    case MESA_FORMAT_BGR_SRGB8:
1101       *datatype = GL_UNSIGNED_BYTE;
1102       *comps = 3;
1103       return;
1104    case MESA_FORMAT_A8B8G8R8_SRGB:
1105    case MESA_FORMAT_B8G8R8A8_SRGB:
1106    case MESA_FORMAT_A8R8G8B8_SRGB:
1107    case MESA_FORMAT_R8G8B8A8_SRGB:
1108       *datatype = GL_UNSIGNED_BYTE;
1109       *comps = 4;
1110       return;
1111    case MESA_FORMAT_L_SRGB8:
1112    case MESA_FORMAT_R_SRGB8:
1113       *datatype = GL_UNSIGNED_BYTE;
1114       *comps = 1;
1115       return;
1116    case MESA_FORMAT_L8A8_SRGB:
1117    case MESA_FORMAT_A8L8_SRGB:
1118       *datatype = GL_UNSIGNED_BYTE;
1119       *comps = 2;
1120       return;
1121
1122    case MESA_FORMAT_RGBA_FLOAT32:
1123       *datatype = GL_FLOAT;
1124       *comps = 4;
1125       return;
1126    case MESA_FORMAT_RGBA_FLOAT16:
1127       *datatype = GL_HALF_FLOAT_ARB;
1128       *comps = 4;
1129       return;
1130    case MESA_FORMAT_RGB_FLOAT32:
1131       *datatype = GL_FLOAT;
1132       *comps = 3;
1133       return;
1134    case MESA_FORMAT_RGB_FLOAT16:
1135       *datatype = GL_HALF_FLOAT_ARB;
1136       *comps = 3;
1137       return;
1138    case MESA_FORMAT_LA_FLOAT32:
1139    case MESA_FORMAT_RG_FLOAT32:
1140       *datatype = GL_FLOAT;
1141       *comps = 2;
1142       return;
1143    case MESA_FORMAT_LA_FLOAT16:
1144    case MESA_FORMAT_RG_FLOAT16:
1145       *datatype = GL_HALF_FLOAT_ARB;
1146       *comps = 2;
1147       return;
1148    case MESA_FORMAT_A_FLOAT32:
1149    case MESA_FORMAT_L_FLOAT32:
1150    case MESA_FORMAT_I_FLOAT32:
1151    case MESA_FORMAT_R_FLOAT32:
1152       *datatype = GL_FLOAT;
1153       *comps = 1;
1154       return;
1155    case MESA_FORMAT_A_FLOAT16:
1156    case MESA_FORMAT_L_FLOAT16:
1157    case MESA_FORMAT_I_FLOAT16:
1158    case MESA_FORMAT_R_FLOAT16:
1159       *datatype = GL_HALF_FLOAT_ARB;
1160       *comps = 1;
1161       return;
1162
1163    case MESA_FORMAT_A_UINT8:
1164    case MESA_FORMAT_L_UINT8:
1165    case MESA_FORMAT_I_UINT8:
1166       *datatype = GL_UNSIGNED_BYTE;
1167       *comps = 1;
1168       return;
1169    case MESA_FORMAT_LA_UINT8:
1170       *datatype = GL_UNSIGNED_BYTE;
1171       *comps = 2;
1172       return;
1173
1174    case MESA_FORMAT_A_UINT16:
1175    case MESA_FORMAT_L_UINT16:
1176    case MESA_FORMAT_I_UINT16:
1177       *datatype = GL_UNSIGNED_SHORT;
1178       *comps = 1;
1179       return;
1180    case MESA_FORMAT_LA_UINT16:
1181       *datatype = GL_UNSIGNED_SHORT;
1182       *comps = 2;
1183       return;
1184    case MESA_FORMAT_A_UINT32:
1185    case MESA_FORMAT_L_UINT32:
1186    case MESA_FORMAT_I_UINT32:
1187       *datatype = GL_UNSIGNED_INT;
1188       *comps = 1;
1189       return;
1190    case MESA_FORMAT_LA_UINT32:
1191       *datatype = GL_UNSIGNED_INT;
1192       *comps = 2;
1193       return;
1194    case MESA_FORMAT_A_SINT8:
1195    case MESA_FORMAT_L_SINT8:
1196    case MESA_FORMAT_I_SINT8:
1197       *datatype = GL_BYTE;
1198       *comps = 1;
1199       return;
1200    case MESA_FORMAT_LA_SINT8:
1201       *datatype = GL_BYTE;
1202       *comps = 2;
1203       return;
1204
1205    case MESA_FORMAT_A_SINT16:
1206    case MESA_FORMAT_L_SINT16:
1207    case MESA_FORMAT_I_SINT16:
1208       *datatype = GL_SHORT;
1209       *comps = 1;
1210       return;
1211    case MESA_FORMAT_LA_SINT16:
1212       *datatype = GL_SHORT;
1213       *comps = 2;
1214       return;
1215
1216    case MESA_FORMAT_A_SINT32:
1217    case MESA_FORMAT_L_SINT32:
1218    case MESA_FORMAT_I_SINT32:
1219       *datatype = GL_INT;
1220       *comps = 1;
1221       return;
1222    case MESA_FORMAT_LA_SINT32:
1223       *datatype = GL_INT;
1224       *comps = 2;
1225       return;
1226
1227    case MESA_FORMAT_R_SINT8:
1228       *datatype = GL_BYTE;
1229       *comps = 1;
1230       return;
1231    case MESA_FORMAT_RG_SINT8:
1232       *datatype = GL_BYTE;
1233       *comps = 2;
1234       return;
1235    case MESA_FORMAT_RGB_SINT8:
1236       *datatype = GL_BYTE;
1237       *comps = 3;
1238       return;
1239    case MESA_FORMAT_RGBA_SINT8:
1240       *datatype = GL_BYTE;
1241       *comps = 4;
1242       return;
1243    case MESA_FORMAT_R_SINT16:
1244       *datatype = GL_SHORT;
1245       *comps = 1;
1246       return;
1247    case MESA_FORMAT_RG_SINT16:
1248       *datatype = GL_SHORT;
1249       *comps = 2;
1250       return;
1251    case MESA_FORMAT_RGB_SINT16:
1252       *datatype = GL_SHORT;
1253       *comps = 3;
1254       return;
1255    case MESA_FORMAT_RGBA_SINT16:
1256       *datatype = GL_SHORT;
1257       *comps = 4;
1258       return;
1259    case MESA_FORMAT_R_SINT32:
1260       *datatype = GL_INT;
1261       *comps = 1;
1262       return;
1263    case MESA_FORMAT_RG_SINT32:
1264       *datatype = GL_INT;
1265       *comps = 2;
1266       return;
1267    case MESA_FORMAT_RGB_SINT32:
1268       *datatype = GL_INT;
1269       *comps = 3;
1270       return;
1271    case MESA_FORMAT_RGBA_SINT32:
1272       *datatype = GL_INT;
1273       *comps = 4;
1274       return;
1275
1276    /**
1277     * \name Non-normalized unsigned integer formats.
1278     */
1279    case MESA_FORMAT_R_UINT8:
1280       *datatype = GL_UNSIGNED_BYTE;
1281       *comps = 1;
1282       return;
1283    case MESA_FORMAT_RG_UINT8:
1284       *datatype = GL_UNSIGNED_BYTE;
1285       *comps = 2;
1286       return;
1287    case MESA_FORMAT_RGB_UINT8:
1288       *datatype = GL_UNSIGNED_BYTE;
1289       *comps = 3;
1290       return;
1291    case MESA_FORMAT_RGBA_UINT8:
1292       *datatype = GL_UNSIGNED_BYTE;
1293       *comps = 4;
1294       return;
1295    case MESA_FORMAT_R_UINT16:
1296       *datatype = GL_UNSIGNED_SHORT;
1297       *comps = 1;
1298       return;
1299    case MESA_FORMAT_RG_UINT16:
1300       *datatype = GL_UNSIGNED_SHORT;
1301       *comps = 2;
1302       return;
1303    case MESA_FORMAT_RGB_UINT16:
1304       *datatype = GL_UNSIGNED_SHORT;
1305       *comps = 3;
1306       return;
1307    case MESA_FORMAT_RGBA_UINT16:
1308       *datatype = GL_UNSIGNED_SHORT;
1309       *comps = 4;
1310       return;
1311    case MESA_FORMAT_R_UINT32:
1312       *datatype = GL_UNSIGNED_INT;
1313       *comps = 1;
1314       return;
1315    case MESA_FORMAT_RG_UINT32:
1316       *datatype = GL_UNSIGNED_INT;
1317       *comps = 2;
1318       return;
1319    case MESA_FORMAT_RGB_UINT32:
1320       *datatype = GL_UNSIGNED_INT;
1321       *comps = 3;
1322       return;
1323    case MESA_FORMAT_RGBA_UINT32:
1324       *datatype = GL_UNSIGNED_INT;
1325       *comps = 4;
1326       return;
1327
1328    case MESA_FORMAT_R9G9B9E5_FLOAT:
1329       *datatype = GL_UNSIGNED_INT_5_9_9_9_REV;
1330       *comps = 3;
1331       return;
1332
1333    case MESA_FORMAT_R11G11B10_FLOAT:
1334       *datatype = GL_UNSIGNED_INT_10F_11F_11F_REV;
1335       *comps = 3;
1336       return;
1337
1338    case MESA_FORMAT_B10G10R10A2_UINT:
1339    case MESA_FORMAT_R10G10B10A2_UINT:
1340       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1341       *comps = 4;
1342       return;
1343
1344    case MESA_FORMAT_R8G8B8X8_SRGB:
1345    case MESA_FORMAT_X8B8G8R8_SRGB:
1346    case MESA_FORMAT_RGBX_UINT8:
1347       *datatype = GL_UNSIGNED_BYTE;
1348       *comps = 4;
1349       return;
1350
1351    case MESA_FORMAT_R8G8B8X8_SNORM:
1352    case MESA_FORMAT_RGBX_SINT8:
1353       *datatype = GL_BYTE;
1354       *comps = 4;
1355       return;
1356
1357    case MESA_FORMAT_B10G10R10X2_UNORM:
1358    case MESA_FORMAT_R10G10B10X2_UNORM:
1359       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1360       *comps = 4;
1361       return;
1362
1363    case MESA_FORMAT_RGBX_UNORM16:
1364    case MESA_FORMAT_RGBX_UINT16:
1365       *datatype = GL_UNSIGNED_SHORT;
1366       *comps = 4;
1367       return;
1368
1369    case MESA_FORMAT_RGBX_SNORM16:
1370    case MESA_FORMAT_RGBX_SINT16:
1371       *datatype = GL_SHORT;
1372       *comps = 4;
1373       return;
1374
1375    case MESA_FORMAT_RGBX_FLOAT16:
1376       *datatype = GL_HALF_FLOAT;
1377       *comps = 4;
1378       return;
1379
1380    case MESA_FORMAT_RGBX_FLOAT32:
1381       *datatype = GL_FLOAT;
1382       *comps = 4;
1383       return;
1384
1385    case MESA_FORMAT_RGBX_UINT32:
1386       *datatype = GL_UNSIGNED_INT;
1387       *comps = 4;
1388       return;
1389
1390    case MESA_FORMAT_RGBX_SINT32:
1391       *datatype = GL_INT;
1392       *comps = 4;
1393       return;
1394
1395    case MESA_FORMAT_R10G10B10A2_UNORM:
1396       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1397       *comps = 4;
1398       return;
1399
1400    case MESA_FORMAT_G8R8_SNORM:
1401       *datatype = GL_BYTE;
1402       *comps = 2;
1403       return;
1404
1405    case MESA_FORMAT_G16R16_SNORM:
1406       *datatype = GL_SHORT;
1407       *comps = 2;
1408       return;
1409
1410    case MESA_FORMAT_B8G8R8X8_SRGB:
1411    case MESA_FORMAT_X8R8G8B8_SRGB:
1412       *datatype = GL_UNSIGNED_BYTE;
1413       *comps = 4;
1414       return;
1415
1416    case MESA_FORMAT_COUNT:
1417       assert(0);
1418       return;
1419    default:
1420       /* Warn if any formats are not handled */
1421       _mesa_problem(NULL, "bad format %s in _mesa_uncompressed_format_to_type_and_comps",
1422                     _mesa_get_format_name(format));
1423       assert(format == MESA_FORMAT_NONE ||
1424              _mesa_is_format_compressed(format));
1425       *datatype = 0;
1426       *comps = 1;
1427    }
1428 }
1429
1430 /**
1431  * Check if a mesa_format exactly matches a GL format/type combination
1432  * such that we can use memcpy() from one to the other.
1433  * \param mesa_format  a MESA_FORMAT_x value
1434  * \param format  the user-specified image format
1435  * \param type  the user-specified image datatype
1436  * \param swapBytes  typically the current pixel pack/unpack byteswap state
1437  * \param[out] error GL_NO_ERROR if format is an expected input.
1438  *                   GL_INVALID_ENUM if format is an unexpected input.
1439  * \return GL_TRUE if the formats match, GL_FALSE otherwise.
1440  */
1441 GLboolean
1442 _mesa_format_matches_format_and_type(mesa_format mesa_format,
1443                                      GLenum format, GLenum type,
1444                                      GLboolean swapBytes, GLenum *error)
1445 {
1446    const GLboolean littleEndian = _mesa_little_endian();
1447    if (error)
1448       *error = GL_NO_ERROR;
1449
1450    /* Note: When reading a GL format/type combination, the format lists channel
1451     * assignments from most significant channel in the type to least
1452     * significant.  A type with _REV indicates that the assignments are
1453     * swapped, so they are listed from least significant to most significant.
1454     *
1455     * Compressed formats will fall through and return GL_FALSE.
1456     *
1457     * For sanity, please keep this switch statement ordered the same as the
1458     * enums in formats.h.
1459     */
1460
1461    switch (mesa_format) {
1462
1463    case MESA_FORMAT_NONE:
1464    case MESA_FORMAT_COUNT:
1465       return GL_FALSE;
1466
1467    case MESA_FORMAT_A8B8G8R8_UNORM:
1468    case MESA_FORMAT_A8B8G8R8_SRGB:
1469       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1470          return GL_TRUE;
1471
1472       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
1473          return GL_TRUE;
1474
1475       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && !littleEndian)
1476          return GL_TRUE;
1477
1478       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV
1479           && !swapBytes)
1480          return GL_TRUE;
1481
1482       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8
1483           && swapBytes)
1484          return GL_TRUE;
1485
1486       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && littleEndian)
1487          return GL_TRUE;
1488
1489       return GL_FALSE;
1490
1491    case MESA_FORMAT_R8G8B8A8_UNORM:
1492    case MESA_FORMAT_R8G8B8A8_SRGB:
1493       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1494           !swapBytes)
1495          return GL_TRUE;
1496
1497       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1498          return GL_TRUE;
1499
1500       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && littleEndian)
1501          return GL_TRUE;
1502
1503       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8 &&
1504           !swapBytes)
1505          return GL_TRUE;
1506
1507       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1508           swapBytes)
1509          return GL_TRUE;
1510
1511       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && !littleEndian)
1512          return GL_TRUE;
1513
1514       return GL_FALSE;
1515
1516    case MESA_FORMAT_B8G8R8A8_UNORM:
1517    case MESA_FORMAT_B8G8R8A8_SRGB:
1518       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1519           !swapBytes)
1520          return GL_TRUE;
1521
1522       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1523          return GL_TRUE;
1524
1525       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && littleEndian)
1526          return GL_TRUE;
1527
1528       return GL_FALSE;
1529
1530    case MESA_FORMAT_A8R8G8B8_UNORM:
1531    case MESA_FORMAT_A8R8G8B8_SRGB:
1532       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1533          return GL_TRUE;
1534
1535       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1536           swapBytes)
1537          return GL_TRUE;
1538
1539       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && !littleEndian)
1540          return GL_TRUE;
1541
1542       return GL_FALSE;
1543
1544    case MESA_FORMAT_X8B8G8R8_UNORM:
1545    case MESA_FORMAT_R8G8B8X8_UNORM:
1546       return GL_FALSE;
1547
1548    case MESA_FORMAT_B8G8R8X8_UNORM:
1549    case MESA_FORMAT_X8R8G8B8_UNORM:
1550       return GL_FALSE;
1551
1552    case MESA_FORMAT_BGR_UNORM8:
1553    case MESA_FORMAT_BGR_SRGB8:
1554       return format == GL_BGR && type == GL_UNSIGNED_BYTE && littleEndian;
1555
1556    case MESA_FORMAT_RGB_UNORM8:
1557       return format == GL_RGB && type == GL_UNSIGNED_BYTE && littleEndian;
1558
1559    case MESA_FORMAT_B5G6R5_UNORM:
1560       return ((format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) ||
1561               (format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1562               !swapBytes;
1563
1564    case MESA_FORMAT_R5G6B5_UNORM:
1565       return ((format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5) ||
1566               (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1567               !swapBytes;
1568
1569    case MESA_FORMAT_B4G4R4A4_UNORM:
1570       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
1571          !swapBytes;
1572
1573    case MESA_FORMAT_A4R4G4B4_UNORM:
1574       return GL_FALSE;
1575
1576    case MESA_FORMAT_A1B5G5R5_UNORM:
1577       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1578          !swapBytes;
1579
1580    case MESA_FORMAT_X1B5G5R5_UNORM:
1581       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1582          !swapBytes;
1583
1584    case MESA_FORMAT_B5G5R5A1_UNORM:
1585       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
1586          !swapBytes;
1587
1588    case MESA_FORMAT_A1R5G5B5_UNORM:
1589       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1590          !swapBytes;
1591
1592    case MESA_FORMAT_L4A4_UNORM:
1593       return GL_FALSE;
1594    case MESA_FORMAT_L8A8_UNORM:
1595    case MESA_FORMAT_L8A8_SRGB:
1596       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_BYTE && littleEndian;
1597    case MESA_FORMAT_A8L8_UNORM:
1598    case MESA_FORMAT_A8L8_SRGB:
1599       return GL_FALSE;
1600
1601    case MESA_FORMAT_L16A16_UNORM:
1602       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_SHORT && littleEndian && !swapBytes;
1603    case MESA_FORMAT_A16L16_UNORM:
1604       return GL_FALSE;
1605
1606    case MESA_FORMAT_B2G3R3_UNORM:
1607       return format == GL_RGB && type == GL_UNSIGNED_BYTE_3_3_2;
1608
1609    case MESA_FORMAT_R3G3B2_UNORM:
1610       return format == GL_RGB && type == GL_UNSIGNED_BYTE_2_3_3_REV;
1611
1612    case MESA_FORMAT_A4B4G4R4_UNORM:
1613       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1614          return GL_TRUE;
1615
1616       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1617          return GL_TRUE;
1618
1619       return GL_FALSE;
1620
1621    case MESA_FORMAT_R4G4B4A4_UNORM:
1622       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1623          return GL_TRUE;
1624
1625       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1626          return GL_TRUE;
1627
1628       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1629          return GL_TRUE;
1630
1631       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1632          return GL_TRUE;
1633
1634       return GL_FALSE;
1635
1636    case MESA_FORMAT_R5G5B5A1_UNORM:
1637       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
1638
1639    case MESA_FORMAT_A2B10G10R10_UNORM:
1640       return format == GL_RGBA && type == GL_UNSIGNED_INT_10_10_10_2;
1641
1642    case MESA_FORMAT_A2B10G10R10_UINT:
1643       return format == GL_RGBA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1644
1645    case MESA_FORMAT_A2R10G10B10_UNORM:
1646       return format == GL_BGRA && type == GL_UNSIGNED_INT_10_10_10_2;
1647
1648    case MESA_FORMAT_A2R10G10B10_UINT:
1649       return format == GL_BGRA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1650
1651    case MESA_FORMAT_A_UNORM8:
1652       return format == GL_ALPHA && type == GL_UNSIGNED_BYTE;
1653    case MESA_FORMAT_A_UNORM16:
1654       return format == GL_ALPHA && type == GL_UNSIGNED_SHORT && !swapBytes;
1655    case MESA_FORMAT_L_UNORM8:
1656    case MESA_FORMAT_L_SRGB8:
1657       return format == GL_LUMINANCE && type == GL_UNSIGNED_BYTE;
1658    case MESA_FORMAT_L_UNORM16:
1659       return format == GL_LUMINANCE && type == GL_UNSIGNED_SHORT && !swapBytes;
1660    case MESA_FORMAT_I_UNORM8:
1661       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1662    case MESA_FORMAT_I_UNORM16:
1663       return format == GL_RED && type == GL_UNSIGNED_SHORT && !swapBytes;
1664
1665    case MESA_FORMAT_YCBCR:
1666       return format == GL_YCBCR_MESA &&
1667              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian != swapBytes) ||
1668               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian == swapBytes));
1669    case MESA_FORMAT_YCBCR_REV:
1670       return format == GL_YCBCR_MESA &&
1671              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian == swapBytes) ||
1672               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian != swapBytes));
1673
1674    case MESA_FORMAT_R_UNORM8:
1675    case MESA_FORMAT_R_SRGB8:
1676       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1677    case MESA_FORMAT_R8G8_UNORM:
1678       return format == GL_RG && type == GL_UNSIGNED_BYTE && littleEndian;
1679    case MESA_FORMAT_G8R8_UNORM:
1680       return GL_FALSE;
1681
1682    case MESA_FORMAT_R_UNORM16:
1683       return format == GL_RED && type == GL_UNSIGNED_SHORT &&
1684          !swapBytes;
1685    case MESA_FORMAT_R16G16_UNORM:
1686       return format == GL_RG && type == GL_UNSIGNED_SHORT && littleEndian &&
1687          !swapBytes;
1688    case MESA_FORMAT_G16R16_UNORM:
1689       return GL_FALSE;
1690
1691    case MESA_FORMAT_B10G10R10A2_UNORM:
1692       return format == GL_BGRA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1693          !swapBytes;
1694
1695    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1696       return format == GL_DEPTH_STENCIL && type == GL_UNSIGNED_INT_24_8 &&
1697          !swapBytes;
1698    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1699    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1700       return GL_FALSE;
1701
1702    case MESA_FORMAT_Z_UNORM16:
1703       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_SHORT &&
1704          !swapBytes;
1705
1706    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1707       return GL_FALSE;
1708
1709    case MESA_FORMAT_Z_UNORM32:
1710       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_INT &&
1711          !swapBytes;
1712
1713    case MESA_FORMAT_S_UINT8:
1714       return format == GL_STENCIL_INDEX && type == GL_UNSIGNED_BYTE;
1715
1716    case MESA_FORMAT_RGBA_FLOAT32:
1717       return format == GL_RGBA && type == GL_FLOAT && !swapBytes;
1718    case MESA_FORMAT_RGBA_FLOAT16:
1719       return format == GL_RGBA && type == GL_HALF_FLOAT && !swapBytes;
1720
1721    case MESA_FORMAT_RGB_FLOAT32:
1722       return format == GL_RGB && type == GL_FLOAT && !swapBytes;
1723    case MESA_FORMAT_RGB_FLOAT16:
1724       return format == GL_RGB && type == GL_HALF_FLOAT && !swapBytes;
1725
1726    case MESA_FORMAT_A_FLOAT32:
1727       return format == GL_ALPHA && type == GL_FLOAT && !swapBytes;
1728    case MESA_FORMAT_A_FLOAT16:
1729       return format == GL_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1730
1731    case MESA_FORMAT_L_FLOAT32:
1732       return format == GL_LUMINANCE && type == GL_FLOAT && !swapBytes;
1733    case MESA_FORMAT_L_FLOAT16:
1734       return format == GL_LUMINANCE && type == GL_HALF_FLOAT && !swapBytes;
1735
1736    case MESA_FORMAT_LA_FLOAT32:
1737       return format == GL_LUMINANCE_ALPHA && type == GL_FLOAT && !swapBytes;
1738    case MESA_FORMAT_LA_FLOAT16:
1739       return format == GL_LUMINANCE_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1740
1741    case MESA_FORMAT_I_FLOAT32:
1742       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1743    case MESA_FORMAT_I_FLOAT16:
1744       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1745
1746    case MESA_FORMAT_R_FLOAT32:
1747       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1748    case MESA_FORMAT_R_FLOAT16:
1749       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1750
1751    case MESA_FORMAT_RG_FLOAT32:
1752       return format == GL_RG && type == GL_FLOAT && !swapBytes;
1753    case MESA_FORMAT_RG_FLOAT16:
1754       return format == GL_RG && type == GL_HALF_FLOAT && !swapBytes;
1755
1756    case MESA_FORMAT_A_UINT8:
1757       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_BYTE;
1758    case MESA_FORMAT_A_UINT16:
1759       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_SHORT &&
1760              !swapBytes;
1761    case MESA_FORMAT_A_UINT32:
1762       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_INT &&
1763              !swapBytes;
1764    case MESA_FORMAT_A_SINT8:
1765       return format == GL_ALPHA_INTEGER && type == GL_BYTE;
1766    case MESA_FORMAT_A_SINT16:
1767       return format == GL_ALPHA_INTEGER && type == GL_SHORT && !swapBytes;
1768    case MESA_FORMAT_A_SINT32:
1769       return format == GL_ALPHA_INTEGER && type == GL_INT && !swapBytes;
1770
1771    case MESA_FORMAT_I_UINT8:
1772       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1773    case MESA_FORMAT_I_UINT16:
1774       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1775    case MESA_FORMAT_I_UINT32:
1776       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1777    case MESA_FORMAT_I_SINT8:
1778       return format == GL_RED_INTEGER && type == GL_BYTE;
1779    case MESA_FORMAT_I_SINT16:
1780       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1781    case MESA_FORMAT_I_SINT32:
1782       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1783
1784    case MESA_FORMAT_L_UINT8:
1785       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_BYTE;
1786    case MESA_FORMAT_L_UINT16:
1787       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_SHORT &&
1788              !swapBytes;
1789    case MESA_FORMAT_L_UINT32:
1790       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_INT &&
1791              !swapBytes;
1792    case MESA_FORMAT_L_SINT8:
1793       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_BYTE;
1794    case MESA_FORMAT_L_SINT16:
1795       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_SHORT &&
1796              !swapBytes;
1797    case MESA_FORMAT_L_SINT32:
1798       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_INT && !swapBytes;
1799
1800    case MESA_FORMAT_LA_UINT8:
1801       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1802              type == GL_UNSIGNED_BYTE && !swapBytes;
1803    case MESA_FORMAT_LA_UINT16:
1804       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1805              type == GL_UNSIGNED_SHORT && !swapBytes;
1806    case MESA_FORMAT_LA_UINT32:
1807       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1808              type == GL_UNSIGNED_INT && !swapBytes;
1809    case MESA_FORMAT_LA_SINT8:
1810       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_BYTE &&
1811              !swapBytes;
1812    case MESA_FORMAT_LA_SINT16:
1813       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_SHORT &&
1814              !swapBytes;
1815    case MESA_FORMAT_LA_SINT32:
1816       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_INT &&
1817              !swapBytes;
1818
1819    case MESA_FORMAT_R_SINT8:
1820       return format == GL_RED_INTEGER && type == GL_BYTE;
1821    case MESA_FORMAT_RG_SINT8:
1822       return format == GL_RG_INTEGER && type == GL_BYTE && !swapBytes;
1823    case MESA_FORMAT_RGB_SINT8:
1824       return format == GL_RGB_INTEGER && type == GL_BYTE && !swapBytes;
1825    case MESA_FORMAT_RGBA_SINT8:
1826       return format == GL_RGBA_INTEGER && type == GL_BYTE && !swapBytes;
1827    case MESA_FORMAT_R_SINT16:
1828       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1829    case MESA_FORMAT_RG_SINT16:
1830       return format == GL_RG_INTEGER && type == GL_SHORT && !swapBytes;
1831    case MESA_FORMAT_RGB_SINT16:
1832       return format == GL_RGB_INTEGER && type == GL_SHORT && !swapBytes;
1833    case MESA_FORMAT_RGBA_SINT16:
1834       return format == GL_RGBA_INTEGER && type == GL_SHORT && !swapBytes;
1835    case MESA_FORMAT_R_SINT32:
1836       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1837    case MESA_FORMAT_RG_SINT32:
1838       return format == GL_RG_INTEGER && type == GL_INT && !swapBytes;
1839    case MESA_FORMAT_RGB_SINT32:
1840       return format == GL_RGB_INTEGER && type == GL_INT && !swapBytes;
1841    case MESA_FORMAT_RGBA_SINT32:
1842       return format == GL_RGBA_INTEGER && type == GL_INT && !swapBytes;
1843
1844    case MESA_FORMAT_R_UINT8:
1845       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1846    case MESA_FORMAT_RG_UINT8:
1847       return format == GL_RG_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1848    case MESA_FORMAT_RGB_UINT8:
1849       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1850    case MESA_FORMAT_RGBA_UINT8:
1851       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_BYTE &&
1852              !swapBytes;
1853    case MESA_FORMAT_R_UINT16:
1854       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT &&
1855              !swapBytes;
1856    case MESA_FORMAT_RG_UINT16:
1857       return format == GL_RG_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1858    case MESA_FORMAT_RGB_UINT16:
1859       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT &&
1860              !swapBytes;
1861    case MESA_FORMAT_RGBA_UINT16:
1862       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT &&
1863              !swapBytes;
1864    case MESA_FORMAT_R_UINT32:
1865       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1866    case MESA_FORMAT_RG_UINT32:
1867       return format == GL_RG_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1868    case MESA_FORMAT_RGB_UINT32:
1869       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1870    case MESA_FORMAT_RGBA_UINT32:
1871       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1872
1873    case MESA_FORMAT_R_SNORM8:
1874       return format == GL_RED && type == GL_BYTE;
1875    case MESA_FORMAT_R8G8_SNORM:
1876       return format == GL_RG && type == GL_BYTE && littleEndian &&
1877              !swapBytes;
1878    case MESA_FORMAT_X8B8G8R8_SNORM:
1879       return GL_FALSE;
1880
1881    case MESA_FORMAT_A8B8G8R8_SNORM:
1882       if (format == GL_RGBA && type == GL_BYTE && !littleEndian)
1883          return GL_TRUE;
1884
1885       if (format == GL_ABGR_EXT && type == GL_BYTE && littleEndian)
1886          return GL_TRUE;
1887
1888       return GL_FALSE;
1889
1890    case MESA_FORMAT_R8G8B8A8_SNORM:
1891       if (format == GL_RGBA && type == GL_BYTE && littleEndian)
1892          return GL_TRUE;
1893
1894       if (format == GL_ABGR_EXT && type == GL_BYTE && !littleEndian)
1895          return GL_TRUE;
1896
1897       return GL_FALSE;
1898
1899    case MESA_FORMAT_R_SNORM16:
1900       return format == GL_RED && type == GL_SHORT &&
1901              !swapBytes;
1902    case MESA_FORMAT_R16G16_SNORM:
1903       return format == GL_RG && type == GL_SHORT && littleEndian && !swapBytes;
1904    case MESA_FORMAT_RGB_SNORM16:
1905       return format == GL_RGB && type == GL_SHORT && !swapBytes;
1906    case MESA_FORMAT_RGBA_SNORM16:
1907       return format == GL_RGBA && type == GL_SHORT && !swapBytes;
1908    case MESA_FORMAT_RGBA_UNORM16:
1909       return format == GL_RGBA && type == GL_UNSIGNED_SHORT &&
1910              !swapBytes;
1911
1912    case MESA_FORMAT_A_SNORM8:
1913       return format == GL_ALPHA && type == GL_BYTE;
1914    case MESA_FORMAT_L_SNORM8:
1915       return format == GL_LUMINANCE && type == GL_BYTE;
1916    case MESA_FORMAT_L8A8_SNORM:
1917       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
1918              littleEndian && !swapBytes;
1919    case MESA_FORMAT_A8L8_SNORM:
1920       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
1921              !littleEndian && !swapBytes;
1922    case MESA_FORMAT_I_SNORM8:
1923       return format == GL_RED && type == GL_BYTE;
1924    case MESA_FORMAT_A_SNORM16:
1925       return format == GL_ALPHA && type == GL_SHORT && !swapBytes;
1926    case MESA_FORMAT_L_SNORM16:
1927       return format == GL_LUMINANCE && type == GL_SHORT && !swapBytes;
1928    case MESA_FORMAT_LA_SNORM16:
1929       return format == GL_LUMINANCE_ALPHA && type == GL_SHORT &&
1930              littleEndian && !swapBytes;
1931    case MESA_FORMAT_I_SNORM16:
1932       return format == GL_RED && type == GL_SHORT && littleEndian &&
1933              !swapBytes;
1934
1935    case MESA_FORMAT_B10G10R10A2_UINT:
1936       return (format == GL_BGRA_INTEGER_EXT &&
1937               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1938               !swapBytes);
1939
1940    case MESA_FORMAT_R10G10B10A2_UINT:
1941       return (format == GL_RGBA_INTEGER_EXT &&
1942               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1943               !swapBytes);
1944
1945    case MESA_FORMAT_B5G6R5_UINT:
1946       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT_5_6_5;
1947
1948    case MESA_FORMAT_R5G6B5_UINT:
1949       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT_5_6_5_REV;
1950
1951    case MESA_FORMAT_B2G3R3_UINT:
1952       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE_3_3_2;
1953
1954    case MESA_FORMAT_R3G3B2_UINT:
1955       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE_2_3_3_REV;
1956
1957    case MESA_FORMAT_A4B4G4R4_UINT:
1958       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1959          return GL_TRUE;
1960
1961       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1962          return GL_TRUE;
1963       return GL_FALSE;
1964
1965    case MESA_FORMAT_R4G4B4A4_UINT:
1966       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1967          return GL_TRUE;
1968
1969       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1970          return GL_TRUE;
1971
1972       return GL_FALSE;
1973
1974    case MESA_FORMAT_B4G4R4A4_UINT:
1975       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
1976          !swapBytes;
1977
1978    case MESA_FORMAT_A4R4G4B4_UINT:
1979       return GL_FALSE;
1980
1981    case MESA_FORMAT_A1B5G5R5_UINT:
1982       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1983          !swapBytes;
1984
1985    case MESA_FORMAT_B5G5R5A1_UINT:
1986       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
1987          !swapBytes;
1988
1989    case MESA_FORMAT_A1R5G5B5_UINT:
1990       return format == GL_BGRA_INTEGER && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1991          !swapBytes;
1992
1993    case MESA_FORMAT_R5G5B5A1_UINT:
1994       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
1995
1996    case MESA_FORMAT_A8B8G8R8_UINT:
1997       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1998          return GL_TRUE;
1999
2000       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
2001          return GL_TRUE;
2002       return GL_FALSE;
2003
2004    case MESA_FORMAT_A8R8G8B8_UINT:
2005       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 &&
2006           !swapBytes)
2007          return GL_TRUE;
2008
2009       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
2010           swapBytes)
2011          return GL_TRUE;
2012
2013       return GL_FALSE;
2014
2015    case MESA_FORMAT_R8G8B8A8_UINT:
2016       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
2017           !swapBytes)
2018          return GL_TRUE;
2019
2020       if (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
2021          return GL_TRUE;
2022
2023       return GL_FALSE;
2024
2025    case MESA_FORMAT_B8G8R8A8_UINT:
2026       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
2027           !swapBytes)
2028          return GL_TRUE;
2029
2030       if (format == GL_BGRA_INTEGER && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
2031          return GL_TRUE;
2032
2033       return GL_FALSE;
2034
2035    case MESA_FORMAT_R9G9B9E5_FLOAT:
2036       return format == GL_RGB && type == GL_UNSIGNED_INT_5_9_9_9_REV &&
2037          !swapBytes;
2038
2039    case MESA_FORMAT_R11G11B10_FLOAT:
2040       return format == GL_RGB && type == GL_UNSIGNED_INT_10F_11F_11F_REV &&
2041          !swapBytes;
2042
2043    case MESA_FORMAT_Z_FLOAT32:
2044       return format == GL_DEPTH_COMPONENT && type == GL_FLOAT && !swapBytes;
2045
2046    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
2047       return format == GL_DEPTH_STENCIL &&
2048              type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV && !swapBytes;
2049
2050    case MESA_FORMAT_B4G4R4X4_UNORM:
2051    case MESA_FORMAT_B5G5R5X1_UNORM:
2052    case MESA_FORMAT_R8G8B8X8_SNORM:
2053    case MESA_FORMAT_R8G8B8X8_SRGB:
2054    case MESA_FORMAT_X8B8G8R8_SRGB:
2055    case MESA_FORMAT_RGBX_UINT8:
2056    case MESA_FORMAT_RGBX_SINT8:
2057    case MESA_FORMAT_B10G10R10X2_UNORM:
2058    case MESA_FORMAT_RGBX_UNORM16:
2059    case MESA_FORMAT_RGBX_SNORM16:
2060    case MESA_FORMAT_RGBX_FLOAT16:
2061    case MESA_FORMAT_RGBX_UINT16:
2062    case MESA_FORMAT_RGBX_SINT16:
2063    case MESA_FORMAT_RGBX_FLOAT32:
2064    case MESA_FORMAT_RGBX_UINT32:
2065    case MESA_FORMAT_RGBX_SINT32:
2066       return GL_FALSE;
2067
2068    case MESA_FORMAT_R10G10B10X2_UNORM:
2069       return format == GL_RGB && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2070          !swapBytes;
2071    case MESA_FORMAT_R10G10B10A2_UNORM:
2072       return format == GL_RGBA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2073          !swapBytes;
2074
2075    case MESA_FORMAT_G8R8_SNORM:
2076       return format == GL_RG && type == GL_BYTE && !littleEndian &&
2077          !swapBytes;
2078
2079    case MESA_FORMAT_G16R16_SNORM:
2080       return format == GL_RG && type == GL_SHORT && !littleEndian &&
2081          !swapBytes;
2082
2083    case MESA_FORMAT_B8G8R8X8_SRGB:
2084    case MESA_FORMAT_X8R8G8B8_SRGB:
2085       return GL_FALSE;
2086    default:
2087       assert(_mesa_is_format_compressed(mesa_format));
2088       if (error)
2089          *error = GL_INVALID_ENUM;
2090    }
2091    return GL_FALSE;
2092 }
2093