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 mesa_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    uint8_t RedBits;
  61    uint8_t GreenBits;
  62    uint8_t BlueBits;
  63    uint8_t AlphaBits;
  64    uint8_t LuminanceBits;
  65    uint8_t IntensityBits;
  66    uint8_t DepthBits;
  67    uint8_t StencilBits;
  68
  69    bool IsSRGBFormat;
  70
  71    /**
  72     * To describe compressed formats.  If not compressed, Width=Height=Depth=1.
  73     */
  74    uint8_t BlockWidth, BlockHeight, BlockDepth;
  75    uint8_t BytesPerBlock;
  76
  77    uint8_t Swizzle[4];
  78    mesa_array_format ArrayFormat;
  79 };
  80
  81 #include "format_info.h"
  82
  83 static const struct mesa_format_info *
  84 _mesa_get_format_info(mesa_format format)
  85 {
  86    const struct mesa_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 mesa_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: return is signed, so as not to coerce math to unsigned. cf. fdo #37351
 109  */
 110 int
 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 mesa_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 mesa_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 unsigned int
 187 _mesa_get_format_max_bits(mesa_format format)
 188 {
 189    const struct mesa_format_info *info = _mesa_get_format_info(format);
 190    unsigned int 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 mesa_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 mesa_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    switch (_mesa_array_format_get_base_format(format)) {
 236    case MESA_ARRAY_FORMAT_BASE_FORMAT_DEPTH:
 237       return GL_DEPTH_COMPONENT;
 238    case MESA_ARRAY_FORMAT_BASE_FORMAT_STENCIL:
 239       return GL_STENCIL_INDEX;
 240    case MESA_ARRAY_FORMAT_BASE_FORMAT_RGBA_VARIANTS:
 241       break;
 242    }
 243
 244    _mesa_array_format_get_swizzle(format, swizzle);
 245    num_channels = _mesa_array_format_get_num_channels(format);
 246
 247    switch (num_channels) {
 248    case 4:
 249       /* FIXME: RGBX formats have 4 channels, but their base format is GL_RGB.
 250        * This is not really a problem for now because we only create array
 251        * formats from GL format/type combinations, and these cannot specify
 252        * RGBX formats.
 253        */
 254       return GL_RGBA;
 255    case 3:
 256       return GL_RGB;
 257    case 2:
 258       if (swizzle[0] == 0 &&
 259           swizzle[1] == 0 &&
 260           swizzle[2] == 0 &&
 261           swizzle[3] == 1)
 262          return GL_LUMINANCE_ALPHA;
 263       if (swizzle[0] == 1 &&
 264           swizzle[1] == 1 &&
 265           swizzle[2] == 1 &&
 266           swizzle[3] == 0)
 267          return GL_LUMINANCE_ALPHA;
 268       if (swizzle[0] == 0 &&
 269           swizzle[1] == 1 &&
 270           swizzle[2] == 4 &&
 271           swizzle[3] == 5)
 272          return GL_RG;
 273       if (swizzle[0] == 1 &&
 274           swizzle[1] == 0 &&
 275           swizzle[2] == 4 &&
 276           swizzle[3] == 5)
 277          return GL_RG;
 278       break;
 279    case 1:
 280       if (swizzle[0] == 0 &&
 281           swizzle[1] == 0 &&
 282           swizzle[2] == 0 &&
 283           swizzle[3] == 5)
 284          return GL_LUMINANCE;
 285       if (swizzle[0] == 0 &&
 286           swizzle[1] == 0 &&
 287           swizzle[2] == 0 &&
 288           swizzle[3] == 0)
 289          return GL_INTENSITY;
 290       if (swizzle[0] <= MESA_FORMAT_SWIZZLE_W)
 291          return GL_RED;
 292       if (swizzle[1] <= MESA_FORMAT_SWIZZLE_W)
 293          return GL_GREEN;
 294       if (swizzle[2] <= MESA_FORMAT_SWIZZLE_W)
 295          return GL_BLUE;
 296       if (swizzle[3] <= MESA_FORMAT_SWIZZLE_W)
 297          return GL_ALPHA;
 298       break;
 299    }
 300
 301    unreachable("Unsupported format");
 302 }
 303
 304 /**
 305  * Return the basic format for the given type.  The result will be one of
 306  * GL_RGB, GL_RGBA, GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY,
 307  * GL_YCBCR_MESA, GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
 308  * This functions accepts a mesa_format or a mesa_array_format.
 309  */
 310 GLenum
 311 _mesa_get_format_base_format(uint32_t format)
 312 {
 313    if (!_mesa_format_is_mesa_array_format(format)) {
 314       const struct mesa_format_info *info = _mesa_get_format_info(format);
 315       return info->BaseFormat;
 316    } else {
 317       return get_base_format_for_array_format(format);
 318    }
 319 }
 320
 321
 322 /**
 323  * Return the block size (in pixels) for the given format.  Normally
 324  * the block size is 1x1.  But compressed formats will have block sizes
 325  * of 4x4 or 8x4 pixels, etc.
 326  * \param bw  returns block width in pixels
 327  * \param bh  returns block height in pixels
 328  */
 329 void
 330 _mesa_get_format_block_size(mesa_format format,
 331                             unsigned int *bw, unsigned int *bh)
 332 {
 333    const struct mesa_format_info *info = _mesa_get_format_info(format);
 334    /* Use _mesa_get_format_block_size_3d() for 3D blocks. */
 335    assert(info->BlockDepth == 1);
 336
 337    *bw = info->BlockWidth;
 338    *bh = info->BlockHeight;
 339 }
 340
 341
 342 /**
 343  * Return the block size (in pixels) for the given format. Normally
 344  * the block size is 1x1x1. But compressed formats will have block
 345  * sizes of 4x4x4, 3x3x3 pixels, etc.
 346  * \param bw  returns block width in pixels
 347  * \param bh  returns block height in pixels
 348  * \param bd  returns block depth in pixels
 349  */
 350 void
 351 _mesa_get_format_block_size_3d(mesa_format format,
 352                                unsigned int *bw,
 353                                unsigned int *bh,
 354                                unsigned int *bd)
 355 {
 356    const struct mesa_format_info *info = _mesa_get_format_info(format);
 357    *bw = info->BlockWidth;
 358    *bh = info->BlockHeight;
 359    *bd = info->BlockDepth;
 360 }
 361
 362
 363 /**
 364  * Returns the an array of four numbers representing the transformation
 365  * from the RGBA or SZ colorspace to the given format.  For array formats,
 366  * the i'th RGBA component is given by:
 367  *
 368  * if (swizzle[i] <= MESA_FORMAT_SWIZZLE_W)
 369  *    comp = data[swizzle[i]];
 370  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ZERO)
 371  *    comp = 0;
 372  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ONE)
 373  *    comp = 1;
 374  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_NONE)
 375  *    // data does not contain a channel of this format
 376  *
 377  * For packed formats, the swizzle gives the number of components left of
 378  * the least significant bit.
 379  *
 380  * Compressed formats have no swizzle.
 381  */
 382 void
 383 _mesa_get_format_swizzle(mesa_format format, uint8_t swizzle_out[4])
 384 {
 385    const struct mesa_format_info *info = _mesa_get_format_info(format);
 386    memcpy(swizzle_out, info->Swizzle, sizeof(info->Swizzle));
 387 }
 388
 389 mesa_array_format
 390 _mesa_array_format_flip_channels(mesa_array_format format)
 391 {
 392    int num_channels;
 393    uint8_t swizzle[4];
 394
 395    num_channels = _mesa_array_format_get_num_channels(format);
 396    _mesa_array_format_get_swizzle(format, swizzle);
 397
 398    if (num_channels == 1)
 399       return format;
 400
 401    if (num_channels == 2) {
 402       /* Assert that the swizzle makes sense for 2 channels */
 403       for (unsigned i = 0; i < 4; i++)
 404          assert(swizzle[i] != 2 && swizzle[i] != 3);
 405
 406       static const uint8_t flip_xy[6] = { 1, 0, 2, 3, 4, 5 };
 407       _mesa_array_format_set_swizzle(&format,
 408                                      flip_xy[swizzle[0]], flip_xy[swizzle[1]],
 409                                      flip_xy[swizzle[2]], flip_xy[swizzle[3]]);
 410       return format;
 411    }
 412
 413    if (num_channels == 4) {
 414       static const uint8_t flip[6] = { 3, 2, 1, 0, 4, 5 };
 415       _mesa_array_format_set_swizzle(&format,
 416                                      flip[swizzle[0]], flip[swizzle[1]],
 417                                      flip[swizzle[2]], flip[swizzle[3]]);
 418       return format;
 419    }
 420
 421    unreachable("Invalid array format");
 422 }
 423
 424 uint32_t
 425 _mesa_format_to_array_format(mesa_format format)
 426 {
 427    const struct mesa_format_info *info = _mesa_get_format_info(format);
 428 #if UTIL_ARCH_BIG_ENDIAN
 429    if (info->ArrayFormat && info->Layout == MESA_FORMAT_LAYOUT_PACKED)
 430       return _mesa_array_format_flip_channels(info->ArrayFormat);
 431    else
 432 #endif
 433       return info->ArrayFormat;
 434 }
 435
 436 static struct hash_table *format_array_format_table;
 437 static once_flag format_array_format_table_exists = ONCE_FLAG_INIT;
 438
 439 static void
 440 format_array_format_table_destroy(void)
 441 {
 442    _mesa_hash_table_destroy(format_array_format_table, NULL);
 443 }
 444
 445 static bool
 446 array_formats_equal(const void *a, const void *b)
 447 {
 448    return (intptr_t)a == (intptr_t)b;
 449 }
 450
 451 static void
 452 format_array_format_table_init(void)
 453 {
 454    const struct mesa_format_info *info;
 455    mesa_array_format array_format;
 456    unsigned f;
 457
 458    format_array_format_table = _mesa_hash_table_create(NULL, NULL,
 459                                                        array_formats_equal);
 460
 461    if (!format_array_format_table) {
 462       _mesa_error_no_memory(__func__);
 463       return;
 464    }
 465
 466    for (f = 1; f < MESA_FORMAT_COUNT; ++f) {
 467       info = _mesa_get_format_info(f);
 468       if (!info->ArrayFormat)
 469          continue;
 470
 471 #if UTIL_ARCH_LITTLE_ENDIAN
 472          array_format = info->ArrayFormat;
 473 #else
 474          array_format = _mesa_array_format_flip_channels(info->ArrayFormat);
 475 #endif
 476
 477       /* This can happen and does for some of the BGR formats.  Let's take
 478        * the first one in the list.
 479        */
 480       if (_mesa_hash_table_search_pre_hashed(format_array_format_table,
 481                                              array_format,
 482                                              (void *)(intptr_t)array_format))
 483          continue;
 484
 485       _mesa_hash_table_insert_pre_hashed(format_array_format_table,
 486                                          array_format,
 487                                          (void *)(intptr_t)array_format,
 488                                          (void *)(intptr_t)f);
 489    }
 490
 491    atexit(format_array_format_table_destroy);
 492 }
 493
 494 mesa_format
 495 _mesa_format_from_array_format(uint32_t array_format)
 496 {
 497    struct hash_entry *entry;
 498
 499    assert(_mesa_format_is_mesa_array_format(array_format));
 500
 501    call_once(&format_array_format_table_exists, format_array_format_table_init);
 502
 503    if (!format_array_format_table) {
 504       static const once_flag once_flag_init = ONCE_FLAG_INIT;
 505       format_array_format_table_exists = once_flag_init;
 506       return MESA_FORMAT_NONE;
 507    }
 508
 509    entry = _mesa_hash_table_search_pre_hashed(format_array_format_table,
 510                                               array_format,
 511                                               (void *)(intptr_t)array_format);
 512    if (entry)
 513       return (intptr_t)entry->data;
 514    else
 515       return MESA_FORMAT_NONE;
 516 }
 517
 518 /** Is the given format a compressed format? */
 519 bool
 520 _mesa_is_format_compressed(mesa_format format)
 521 {
 522    const struct mesa_format_info *info = _mesa_get_format_info(format);
 523    return info->BlockWidth > 1 || info->BlockHeight > 1;
 524 }
 525
 526
 527 /**
 528  * Determine if the given format represents a packed depth/stencil buffer.
 529  */
 530 bool
 531 _mesa_is_format_packed_depth_stencil(mesa_format format)
 532 {
 533    const struct mesa_format_info *info = _mesa_get_format_info(format);
 534
 535    return info->BaseFormat == GL_DEPTH_STENCIL;
 536 }
 537
 538
 539 /**
 540  * Is the given format a signed/unsigned integer color format?
 541  */
 542 bool
 543 _mesa_is_format_integer_color(mesa_format format)
 544 {
 545    const struct mesa_format_info *info = _mesa_get_format_info(format);
 546    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT) &&
 547       info->BaseFormat != GL_DEPTH_COMPONENT &&
 548       info->BaseFormat != GL_DEPTH_STENCIL &&
 549       info->BaseFormat != GL_STENCIL_INDEX;
 550 }
 551
 552
 553 /**
 554  * Is the given format an unsigned integer format?
 555  */
 556 bool
 557 _mesa_is_format_unsigned(mesa_format format)
 558 {
 559    const struct mesa_format_info *info = _mesa_get_format_info(format);
 560    return _mesa_is_type_unsigned(info->DataType);
 561 }
 562
 563
 564 /**
 565  * Does the given format store signed values?
 566  */
 567 bool
 568 _mesa_is_format_signed(mesa_format format)
 569 {
 570    if (format == MESA_FORMAT_R11G11B10_FLOAT ||
 571        format == MESA_FORMAT_R9G9B9E5_FLOAT) {
 572       /* these packed float formats only store unsigned values */
 573       return false;
 574    }
 575    else {
 576       const struct mesa_format_info *info = _mesa_get_format_info(format);
 577       return (info->DataType == GL_SIGNED_NORMALIZED ||
 578               info->DataType == GL_INT ||
 579               info->DataType == GL_FLOAT);
 580    }
 581 }
 582
 583 /**
 584  * Is the given format an integer format?
 585  */
 586 bool
 587 _mesa_is_format_integer(mesa_format format)
 588 {
 589    const struct mesa_format_info *info = _mesa_get_format_info(format);
 590    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT);
 591 }
 592
 593
 594 /**
 595  * Return true if the given format is a color format.
 596  */
 597 bool
 598 _mesa_is_format_color_format(mesa_format format)
 599 {
 600    const struct mesa_format_info *info = _mesa_get_format_info(format);
 601    switch (info->BaseFormat) {
 602    case GL_DEPTH_COMPONENT:
 603    case GL_STENCIL_INDEX:
 604    case GL_DEPTH_STENCIL:
 605       return false;
 606    default:
 607       return true;
 608    }
 609 }
 610
 611 bool
 612 _mesa_is_format_srgb(mesa_format format)
 613 {
 614    const struct mesa_format_info *info = _mesa_get_format_info(format);
 615    return info->IsSRGBFormat;
 616 }
 617
 618 /**
 619  * Return TRUE if format is an ETC2 compressed format specified
 620  * by GL_ARB_ES3_compatibility.
 621  */
 622 bool
 623 _mesa_is_format_etc2(mesa_format format)
 624 {
 625    switch (format) {
 626    case MESA_FORMAT_ETC2_RGB8:
 627    case MESA_FORMAT_ETC2_SRGB8:
 628    case MESA_FORMAT_ETC2_RGBA8_EAC:
 629    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 630    case MESA_FORMAT_ETC2_R11_EAC:
 631    case MESA_FORMAT_ETC2_RG11_EAC:
 632    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 633    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 634    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 635    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 636       return true;
 637    default:
 638       return false;
 639    }
 640 }
 641
 642
 643 /**
 644  * Return TRUE if format is an ASTC 2D compressed format.
 645  */
 646 bool
 647 _mesa_is_format_astc_2d(mesa_format format)
 648 {
 649    switch (format) {
 650    case MESA_FORMAT_RGBA_ASTC_4x4:
 651    case MESA_FORMAT_RGBA_ASTC_5x4:
 652    case MESA_FORMAT_RGBA_ASTC_5x5:
 653    case MESA_FORMAT_RGBA_ASTC_6x5:
 654    case MESA_FORMAT_RGBA_ASTC_6x6:
 655    case MESA_FORMAT_RGBA_ASTC_8x5:
 656    case MESA_FORMAT_RGBA_ASTC_8x6:
 657    case MESA_FORMAT_RGBA_ASTC_8x8:
 658    case MESA_FORMAT_RGBA_ASTC_10x5:
 659    case MESA_FORMAT_RGBA_ASTC_10x6:
 660    case MESA_FORMAT_RGBA_ASTC_10x8:
 661    case MESA_FORMAT_RGBA_ASTC_10x10:
 662    case MESA_FORMAT_RGBA_ASTC_12x10:
 663    case MESA_FORMAT_RGBA_ASTC_12x12:
 664    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4:
 665    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x4:
 666    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5:
 667    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x5:
 668    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6:
 669    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x5:
 670    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x6:
 671    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x8:
 672    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x5:
 673    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x6:
 674    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x8:
 675    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x10:
 676    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x10:
 677    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x12:
 678       return true;
 679    default:
 680       return false;
 681    }
 682 }
 683
 684
 685 /**
 686  * If the given format is a compressed format, return a corresponding
 687  * uncompressed format.
 688  */
 689 mesa_format
 690 _mesa_get_uncompressed_format(mesa_format format)
 691 {
 692    switch (format) {
 693    case MESA_FORMAT_RGB_FXT1:
 694       return MESA_FORMAT_BGR_UNORM8;
 695    case MESA_FORMAT_RGBA_FXT1:
 696       return MESA_FORMAT_A8B8G8R8_UNORM;
 697    case MESA_FORMAT_RGB_DXT1:
 698    case MESA_FORMAT_SRGB_DXT1:
 699       return MESA_FORMAT_BGR_UNORM8;
 700    case MESA_FORMAT_RGBA_DXT1:
 701    case MESA_FORMAT_SRGBA_DXT1:
 702       return MESA_FORMAT_A8B8G8R8_UNORM;
 703    case MESA_FORMAT_RGBA_DXT3:
 704    case MESA_FORMAT_SRGBA_DXT3:
 705       return MESA_FORMAT_A8B8G8R8_UNORM;
 706    case MESA_FORMAT_RGBA_DXT5:
 707    case MESA_FORMAT_SRGBA_DXT5:
 708       return MESA_FORMAT_A8B8G8R8_UNORM;
 709    case MESA_FORMAT_R_RGTC1_UNORM:
 710       return MESA_FORMAT_R_UNORM8;
 711    case MESA_FORMAT_R_RGTC1_SNORM:
 712       return MESA_FORMAT_R_SNORM8;
 713    case MESA_FORMAT_RG_RGTC2_UNORM:
 714       return MESA_FORMAT_RG_UNORM8;
 715    case MESA_FORMAT_RG_RGTC2_SNORM:
 716       return MESA_FORMAT_RG_SNORM8;
 717    case MESA_FORMAT_L_LATC1_UNORM:
 718       return MESA_FORMAT_L_UNORM8;
 719    case MESA_FORMAT_L_LATC1_SNORM:
 720       return MESA_FORMAT_L_SNORM8;
 721    case MESA_FORMAT_LA_LATC2_UNORM:
 722       return MESA_FORMAT_LA_UNORM8;
 723    case MESA_FORMAT_LA_LATC2_SNORM:
 724       return MESA_FORMAT_LA_SNORM8;
 725    case MESA_FORMAT_ETC1_RGB8:
 726    case MESA_FORMAT_ETC2_RGB8:
 727    case MESA_FORMAT_ETC2_SRGB8:
 728    case MESA_FORMAT_ATC_RGB:
 729       return MESA_FORMAT_BGR_UNORM8;
 730    case MESA_FORMAT_ETC2_RGBA8_EAC:
 731    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 732    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 733    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 734    case MESA_FORMAT_ATC_RGBA_EXPLICIT:
 735    case MESA_FORMAT_ATC_RGBA_INTERPOLATED:
 736       return MESA_FORMAT_A8B8G8R8_UNORM;
 737    case MESA_FORMAT_ETC2_R11_EAC:
 738    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 739       return MESA_FORMAT_R_UNORM16;
 740    case MESA_FORMAT_ETC2_RG11_EAC:
 741    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 742       return MESA_FORMAT_RG_UNORM16;
 743    case MESA_FORMAT_BPTC_RGBA_UNORM:
 744    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 745       return MESA_FORMAT_A8B8G8R8_UNORM;
 746    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
 747    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
 748       return MESA_FORMAT_RGB_FLOAT32;
 749    default:
 750       assert(!_mesa_is_format_compressed(format));
 751       return format;
 752    }
 753 }
 754
 755
 756 unsigned int
 757 _mesa_format_num_components(mesa_format format)
 758 {
 759    const struct mesa_format_info *info = _mesa_get_format_info(format);
 760    return ((info->RedBits > 0) +
 761            (info->GreenBits > 0) +
 762            (info->BlueBits > 0) +
 763            (info->AlphaBits > 0) +
 764            (info->LuminanceBits > 0) +
 765            (info->IntensityBits > 0) +
 766            (info->DepthBits > 0) +
 767            (info->StencilBits > 0));
 768 }
 769
 770
 771 /**
 772  * Returns true if a color format has data stored in the R/G/B/A channels,
 773  * given an index from 0 to 3.
 774  */
 775 bool
 776 _mesa_format_has_color_component(mesa_format format, int component)
 777 {
 778    const struct mesa_format_info *info = _mesa_get_format_info(format);
 779
 780    assert(info->BaseFormat != GL_DEPTH_COMPONENT &&
 781           info->BaseFormat != GL_DEPTH_STENCIL &&
 782           info->BaseFormat != GL_STENCIL_INDEX);
 783
 784    switch (component) {
 785    case 0:
 786       return (info->RedBits + info->IntensityBits + info->LuminanceBits) > 0;
 787    case 1:
 788       return (info->GreenBits + info->IntensityBits + info->LuminanceBits) > 0;
 789    case 2:
 790       return (info->BlueBits + info->IntensityBits + info->LuminanceBits) > 0;
 791    case 3:
 792       return (info->AlphaBits + info->IntensityBits) > 0;
 793    default:
 794       assert(!"Invalid color component: must be 0..3");
 795       return false;
 796    }
 797 }
 798
 799
 800 /**
 801  * Return number of bytes needed to store an image of the given size
 802  * in the given format.
 803  */
 804 uint32_t
 805 _mesa_format_image_size(mesa_format format, int width,
 806                         int height, int depth)
 807 {
 808    const struct mesa_format_info *info = _mesa_get_format_info(format);
 809    uint32_t sz;
 810    /* Strictly speaking, a conditional isn't needed here */
 811    if (info->BlockWidth > 1 || info->BlockHeight > 1 || info->BlockDepth > 1) {
 812       /* compressed format (2D only for now) */
 813       const uint32_t bw = info->BlockWidth;
 814       const uint32_t bh = info->BlockHeight;
 815       const uint32_t bd = info->BlockDepth;
 816       const uint32_t wblocks = (width + bw - 1) / bw;
 817       const uint32_t hblocks = (height + bh - 1) / bh;
 818       const uint32_t dblocks = (depth + bd - 1) / bd;
 819       sz = wblocks * hblocks * dblocks * info->BytesPerBlock;
 820    } else
 821       /* non-compressed */
 822       sz = width * height * depth * info->BytesPerBlock;
 823
 824    return sz;
 825 }
 826
 827
 828 /**
 829  * Same as _mesa_format_image_size() but returns a 64-bit value to
 830  * accommodate very large textures.
 831  */
 832 uint64_t
 833 _mesa_format_image_size64(mesa_format format, int width,
 834                           int height, int depth)
 835 {
 836    const struct mesa_format_info *info = _mesa_get_format_info(format);
 837    uint64_t sz;
 838    /* Strictly speaking, a conditional isn't needed here */
 839    if (info->BlockWidth > 1 || info->BlockHeight > 1 || info->BlockDepth > 1) {
 840       /* compressed format (2D only for now) */
 841       const uint64_t bw = info->BlockWidth;
 842       const uint64_t bh = info->BlockHeight;
 843       const uint64_t bd = info->BlockDepth;
 844       const uint64_t wblocks = (width + bw - 1) / bw;
 845       const uint64_t hblocks = (height + bh - 1) / bh;
 846       const uint64_t dblocks = (depth + bd - 1) / bd;
 847       sz = wblocks * hblocks * dblocks * info->BytesPerBlock;
 848    } else
 849       /* non-compressed */
 850       sz = ((uint64_t) width * (uint64_t) height *
 851             (uint64_t) depth * info->BytesPerBlock);
 852
 853    return sz;
 854 }
 855
 856
 857
 858 int32_t
 859 _mesa_format_row_stride(mesa_format format, int width)
 860 {
 861    const struct mesa_format_info *info = _mesa_get_format_info(format);
 862    /* Strictly speaking, a conditional isn't needed here */
 863    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 864       /* compressed format */
 865       const uint32_t bw = info->BlockWidth;
 866       const uint32_t wblocks = (width + bw - 1) / bw;
 867       const int32_t stride = wblocks * info->BytesPerBlock;
 868       return stride;
 869    }
 870    else {
 871       const int32_t stride = width * info->BytesPerBlock;
 872       return stride;
 873    }
 874 }
 875
 876
 877
 878 /**
 879  * Return datatype and number of components per texel for the given
 880  * uncompressed mesa_format. Only used for mipmap generation code.
 881  */
 882 void
 883 _mesa_uncompressed_format_to_type_and_comps(mesa_format format,
 884                                GLenum *datatype, GLuint *comps)
 885 {
 886    switch (format) {
 887    case MESA_FORMAT_A8B8G8R8_UNORM:
 888    case MESA_FORMAT_R8G8B8A8_UNORM:
 889    case MESA_FORMAT_B8G8R8A8_UNORM:
 890    case MESA_FORMAT_A8R8G8B8_UNORM:
 891    case MESA_FORMAT_X8B8G8R8_UNORM:
 892    case MESA_FORMAT_R8G8B8X8_UNORM:
 893    case MESA_FORMAT_B8G8R8X8_UNORM:
 894    case MESA_FORMAT_X8R8G8B8_UNORM:
 895    case MESA_FORMAT_A8B8G8R8_UINT:
 896    case MESA_FORMAT_R8G8B8A8_UINT:
 897    case MESA_FORMAT_B8G8R8A8_UINT:
 898    case MESA_FORMAT_A8R8G8B8_UINT:
 899       *datatype = GL_UNSIGNED_BYTE;
 900       *comps = 4;
 901       return;
 902    case MESA_FORMAT_BGR_UNORM8:
 903    case MESA_FORMAT_RGB_UNORM8:
 904       *datatype = GL_UNSIGNED_BYTE;
 905       *comps = 3;
 906       return;
 907    case MESA_FORMAT_B5G6R5_UNORM:
 908    case MESA_FORMAT_R5G6B5_UNORM:
 909    case MESA_FORMAT_B5G6R5_UINT:
 910    case MESA_FORMAT_R5G6B5_UINT:
 911       *datatype = GL_UNSIGNED_SHORT_5_6_5;
 912       *comps = 3;
 913       return;
 914
 915    case MESA_FORMAT_B4G4R4A4_UNORM:
 916    case MESA_FORMAT_A4R4G4B4_UNORM:
 917    case MESA_FORMAT_B4G4R4X4_UNORM:
 918    case MESA_FORMAT_B4G4R4A4_UINT:
 919    case MESA_FORMAT_A4R4G4B4_UINT:
 920       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 921       *comps = 4;
 922       return;
 923
 924    case MESA_FORMAT_B5G5R5A1_UNORM:
 925    case MESA_FORMAT_A1R5G5B5_UNORM:
 926    case MESA_FORMAT_B5G5R5X1_UNORM:
 927    case MESA_FORMAT_B5G5R5A1_UINT:
 928    case MESA_FORMAT_A1R5G5B5_UINT:
 929       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 930       *comps = 4;
 931       return;
 932
 933    case MESA_FORMAT_B10G10R10A2_UNORM:
 934       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
 935       *comps = 4;
 936       return;
 937
 938    case MESA_FORMAT_A1B5G5R5_UNORM:
 939    case MESA_FORMAT_A1B5G5R5_UINT:
 940    case MESA_FORMAT_X1B5G5R5_UNORM:
 941       *datatype = GL_UNSIGNED_SHORT_5_5_5_1;
 942       *comps = 4;
 943       return;
 944
 945    case MESA_FORMAT_L4A4_UNORM:
 946       *datatype = MESA_UNSIGNED_BYTE_4_4;
 947       *comps = 2;
 948       return;
 949
 950    case MESA_FORMAT_LA_UNORM8:
 951    case MESA_FORMAT_RG_UNORM8:
 952       *datatype = GL_UNSIGNED_BYTE;
 953       *comps = 2;
 954       return;
 955
 956    case MESA_FORMAT_LA_UNORM16:
 957    case MESA_FORMAT_RG_UNORM16:
 958       *datatype = GL_UNSIGNED_SHORT;
 959       *comps = 2;
 960       return;
 961
 962    case MESA_FORMAT_R_UNORM16:
 963    case MESA_FORMAT_A_UNORM16:
 964    case MESA_FORMAT_L_UNORM16:
 965    case MESA_FORMAT_I_UNORM16:
 966       *datatype = GL_UNSIGNED_SHORT;
 967       *comps = 1;
 968       return;
 969
 970    case MESA_FORMAT_R3G3B2_UNORM:
 971    case MESA_FORMAT_R3G3B2_UINT:
 972       *datatype = GL_UNSIGNED_BYTE_2_3_3_REV;
 973       *comps = 3;
 974       return;
 975    case MESA_FORMAT_A4B4G4R4_UNORM:
 976    case MESA_FORMAT_A4B4G4R4_UINT:
 977       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 978       *comps = 4;
 979       return;
 980
 981    case MESA_FORMAT_R4G4B4A4_UNORM:
 982    case MESA_FORMAT_R4G4B4A4_UINT:
 983       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 984       *comps = 4;
 985       return;
 986    case MESA_FORMAT_R5G5B5A1_UNORM:
 987    case MESA_FORMAT_R5G5B5A1_UINT:
 988       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 989       *comps = 4;
 990       return;
 991    case MESA_FORMAT_A2B10G10R10_UNORM:
 992    case MESA_FORMAT_A2B10G10R10_UINT:
 993       *datatype = GL_UNSIGNED_INT_10_10_10_2;
 994       *comps = 4;
 995       return;
 996    case MESA_FORMAT_A2R10G10B10_UNORM:
 997    case MESA_FORMAT_A2R10G10B10_UINT:
 998       *datatype = GL_UNSIGNED_INT_10_10_10_2;
 999       *comps = 4;
1000       return;
1001
1002    case MESA_FORMAT_B2G3R3_UNORM:
1003    case MESA_FORMAT_B2G3R3_UINT:
1004       *datatype = GL_UNSIGNED_BYTE_3_3_2;
1005       *comps = 3;
1006       return;
1007
1008    case MESA_FORMAT_A_UNORM8:
1009    case MESA_FORMAT_L_UNORM8:
1010    case MESA_FORMAT_I_UNORM8:
1011    case MESA_FORMAT_R_UNORM8:
1012    case MESA_FORMAT_S_UINT8:
1013       *datatype = GL_UNSIGNED_BYTE;
1014       *comps = 1;
1015       return;
1016
1017    case MESA_FORMAT_YCBCR:
1018    case MESA_FORMAT_YCBCR_REV:
1019       *datatype = GL_UNSIGNED_SHORT;
1020       *comps = 2;
1021       return;
1022
1023    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1024       *datatype = GL_UNSIGNED_INT_24_8_MESA;
1025       *comps = 2;
1026       return;
1027
1028    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1029       *datatype = GL_UNSIGNED_INT_8_24_REV_MESA;
1030       *comps = 2;
1031       return;
1032
1033    case MESA_FORMAT_Z_UNORM16:
1034       *datatype = GL_UNSIGNED_SHORT;
1035       *comps = 1;
1036       return;
1037
1038    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1039       *datatype = GL_UNSIGNED_INT;
1040       *comps = 1;
1041       return;
1042
1043    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1044       *datatype = GL_UNSIGNED_INT;
1045       *comps = 1;
1046       return;
1047
1048    case MESA_FORMAT_Z_UNORM32:
1049       *datatype = GL_UNSIGNED_INT;
1050       *comps = 1;
1051       return;
1052
1053    case MESA_FORMAT_Z_FLOAT32:
1054       *datatype = GL_FLOAT;
1055       *comps = 1;
1056       return;
1057
1058    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
1059       *datatype = GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
1060       *comps = 1;
1061       return;
1062
1063    case MESA_FORMAT_R_SNORM8:
1064    case MESA_FORMAT_A_SNORM8:
1065    case MESA_FORMAT_L_SNORM8:
1066    case MESA_FORMAT_I_SNORM8:
1067       *datatype = GL_BYTE;
1068       *comps = 1;
1069       return;
1070    case MESA_FORMAT_RG_SNORM8:
1071    case MESA_FORMAT_LA_SNORM8:
1072       *datatype = GL_BYTE;
1073       *comps = 2;
1074       return;
1075    case MESA_FORMAT_A8B8G8R8_SNORM:
1076    case MESA_FORMAT_R8G8B8A8_SNORM:
1077    case MESA_FORMAT_X8B8G8R8_SNORM:
1078       *datatype = GL_BYTE;
1079       *comps = 4;
1080       return;
1081
1082    case MESA_FORMAT_RGBA_UNORM16:
1083       *datatype = GL_UNSIGNED_SHORT;
1084       *comps = 4;
1085       return;
1086
1087    case MESA_FORMAT_R_SNORM16:
1088    case MESA_FORMAT_A_SNORM16:
1089    case MESA_FORMAT_L_SNORM16:
1090    case MESA_FORMAT_I_SNORM16:
1091       *datatype = GL_SHORT;
1092       *comps = 1;
1093       return;
1094    case MESA_FORMAT_RG_SNORM16:
1095    case MESA_FORMAT_LA_SNORM16:
1096       *datatype = GL_SHORT;
1097       *comps = 2;
1098       return;
1099    case MESA_FORMAT_RGB_SNORM16:
1100       *datatype = GL_SHORT;
1101       *comps = 3;
1102       return;
1103    case MESA_FORMAT_RGBA_SNORM16:
1104       *datatype = GL_SHORT;
1105       *comps = 4;
1106       return;
1107
1108    case MESA_FORMAT_BGR_SRGB8:
1109       *datatype = GL_UNSIGNED_BYTE;
1110       *comps = 3;
1111       return;
1112    case MESA_FORMAT_A8B8G8R8_SRGB:
1113    case MESA_FORMAT_B8G8R8A8_SRGB:
1114    case MESA_FORMAT_A8R8G8B8_SRGB:
1115    case MESA_FORMAT_R8G8B8A8_SRGB:
1116       *datatype = GL_UNSIGNED_BYTE;
1117       *comps = 4;
1118       return;
1119    case MESA_FORMAT_L_SRGB8:
1120    case MESA_FORMAT_R_SRGB8:
1121       *datatype = GL_UNSIGNED_BYTE;
1122       *comps = 1;
1123       return;
1124    case MESA_FORMAT_LA_SRGB8:
1125       *datatype = GL_UNSIGNED_BYTE;
1126       *comps = 2;
1127       return;
1128
1129    case MESA_FORMAT_RGBA_FLOAT32:
1130       *datatype = GL_FLOAT;
1131       *comps = 4;
1132       return;
1133    case MESA_FORMAT_RGBA_FLOAT16:
1134       *datatype = GL_HALF_FLOAT_ARB;
1135       *comps = 4;
1136       return;
1137    case MESA_FORMAT_RGB_FLOAT32:
1138       *datatype = GL_FLOAT;
1139       *comps = 3;
1140       return;
1141    case MESA_FORMAT_RGB_FLOAT16:
1142       *datatype = GL_HALF_FLOAT_ARB;
1143       *comps = 3;
1144       return;
1145    case MESA_FORMAT_LA_FLOAT32:
1146    case MESA_FORMAT_RG_FLOAT32:
1147       *datatype = GL_FLOAT;
1148       *comps = 2;
1149       return;
1150    case MESA_FORMAT_LA_FLOAT16:
1151    case MESA_FORMAT_RG_FLOAT16:
1152       *datatype = GL_HALF_FLOAT_ARB;
1153       *comps = 2;
1154       return;
1155    case MESA_FORMAT_A_FLOAT32:
1156    case MESA_FORMAT_L_FLOAT32:
1157    case MESA_FORMAT_I_FLOAT32:
1158    case MESA_FORMAT_R_FLOAT32:
1159       *datatype = GL_FLOAT;
1160       *comps = 1;
1161       return;
1162    case MESA_FORMAT_A_FLOAT16:
1163    case MESA_FORMAT_L_FLOAT16:
1164    case MESA_FORMAT_I_FLOAT16:
1165    case MESA_FORMAT_R_FLOAT16:
1166       *datatype = GL_HALF_FLOAT_ARB;
1167       *comps = 1;
1168       return;
1169
1170    case MESA_FORMAT_A_UINT8:
1171    case MESA_FORMAT_L_UINT8:
1172    case MESA_FORMAT_I_UINT8:
1173       *datatype = GL_UNSIGNED_BYTE;
1174       *comps = 1;
1175       return;
1176    case MESA_FORMAT_LA_UINT8:
1177       *datatype = GL_UNSIGNED_BYTE;
1178       *comps = 2;
1179       return;
1180
1181    case MESA_FORMAT_A_UINT16:
1182    case MESA_FORMAT_L_UINT16:
1183    case MESA_FORMAT_I_UINT16:
1184       *datatype = GL_UNSIGNED_SHORT;
1185       *comps = 1;
1186       return;
1187    case MESA_FORMAT_LA_UINT16:
1188       *datatype = GL_UNSIGNED_SHORT;
1189       *comps = 2;
1190       return;
1191    case MESA_FORMAT_A_UINT32:
1192    case MESA_FORMAT_L_UINT32:
1193    case MESA_FORMAT_I_UINT32:
1194       *datatype = GL_UNSIGNED_INT;
1195       *comps = 1;
1196       return;
1197    case MESA_FORMAT_LA_UINT32:
1198       *datatype = GL_UNSIGNED_INT;
1199       *comps = 2;
1200       return;
1201    case MESA_FORMAT_A_SINT8:
1202    case MESA_FORMAT_L_SINT8:
1203    case MESA_FORMAT_I_SINT8:
1204       *datatype = GL_BYTE;
1205       *comps = 1;
1206       return;
1207    case MESA_FORMAT_LA_SINT8:
1208       *datatype = GL_BYTE;
1209       *comps = 2;
1210       return;
1211
1212    case MESA_FORMAT_A_SINT16:
1213    case MESA_FORMAT_L_SINT16:
1214    case MESA_FORMAT_I_SINT16:
1215       *datatype = GL_SHORT;
1216       *comps = 1;
1217       return;
1218    case MESA_FORMAT_LA_SINT16:
1219       *datatype = GL_SHORT;
1220       *comps = 2;
1221       return;
1222
1223    case MESA_FORMAT_A_SINT32:
1224    case MESA_FORMAT_L_SINT32:
1225    case MESA_FORMAT_I_SINT32:
1226       *datatype = GL_INT;
1227       *comps = 1;
1228       return;
1229    case MESA_FORMAT_LA_SINT32:
1230       *datatype = GL_INT;
1231       *comps = 2;
1232       return;
1233
1234    case MESA_FORMAT_R_SINT8:
1235       *datatype = GL_BYTE;
1236       *comps = 1;
1237       return;
1238    case MESA_FORMAT_RG_SINT8:
1239       *datatype = GL_BYTE;
1240       *comps = 2;
1241       return;
1242    case MESA_FORMAT_RGB_SINT8:
1243       *datatype = GL_BYTE;
1244       *comps = 3;
1245       return;
1246    case MESA_FORMAT_RGBA_SINT8:
1247       *datatype = GL_BYTE;
1248       *comps = 4;
1249       return;
1250    case MESA_FORMAT_R_SINT16:
1251       *datatype = GL_SHORT;
1252       *comps = 1;
1253       return;
1254    case MESA_FORMAT_RG_SINT16:
1255       *datatype = GL_SHORT;
1256       *comps = 2;
1257       return;
1258    case MESA_FORMAT_RGB_SINT16:
1259       *datatype = GL_SHORT;
1260       *comps = 3;
1261       return;
1262    case MESA_FORMAT_RGBA_SINT16:
1263       *datatype = GL_SHORT;
1264       *comps = 4;
1265       return;
1266    case MESA_FORMAT_R_SINT32:
1267       *datatype = GL_INT;
1268       *comps = 1;
1269       return;
1270    case MESA_FORMAT_RG_SINT32:
1271       *datatype = GL_INT;
1272       *comps = 2;
1273       return;
1274    case MESA_FORMAT_RGB_SINT32:
1275       *datatype = GL_INT;
1276       *comps = 3;
1277       return;
1278    case MESA_FORMAT_RGBA_SINT32:
1279       *datatype = GL_INT;
1280       *comps = 4;
1281       return;
1282
1283    /**
1284     * \name Non-normalized unsigned integer formats.
1285     */
1286    case MESA_FORMAT_R_UINT8:
1287       *datatype = GL_UNSIGNED_BYTE;
1288       *comps = 1;
1289       return;
1290    case MESA_FORMAT_RG_UINT8:
1291       *datatype = GL_UNSIGNED_BYTE;
1292       *comps = 2;
1293       return;
1294    case MESA_FORMAT_RGB_UINT8:
1295       *datatype = GL_UNSIGNED_BYTE;
1296       *comps = 3;
1297       return;
1298    case MESA_FORMAT_RGBA_UINT8:
1299       *datatype = GL_UNSIGNED_BYTE;
1300       *comps = 4;
1301       return;
1302    case MESA_FORMAT_R_UINT16:
1303       *datatype = GL_UNSIGNED_SHORT;
1304       *comps = 1;
1305       return;
1306    case MESA_FORMAT_RG_UINT16:
1307       *datatype = GL_UNSIGNED_SHORT;
1308       *comps = 2;
1309       return;
1310    case MESA_FORMAT_RGB_UINT16:
1311       *datatype = GL_UNSIGNED_SHORT;
1312       *comps = 3;
1313       return;
1314    case MESA_FORMAT_RGBA_UINT16:
1315       *datatype = GL_UNSIGNED_SHORT;
1316       *comps = 4;
1317       return;
1318    case MESA_FORMAT_R_UINT32:
1319       *datatype = GL_UNSIGNED_INT;
1320       *comps = 1;
1321       return;
1322    case MESA_FORMAT_RG_UINT32:
1323       *datatype = GL_UNSIGNED_INT;
1324       *comps = 2;
1325       return;
1326    case MESA_FORMAT_RGB_UINT32:
1327       *datatype = GL_UNSIGNED_INT;
1328       *comps = 3;
1329       return;
1330    case MESA_FORMAT_RGBA_UINT32:
1331       *datatype = GL_UNSIGNED_INT;
1332       *comps = 4;
1333       return;
1334
1335    case MESA_FORMAT_R9G9B9E5_FLOAT:
1336       *datatype = GL_UNSIGNED_INT_5_9_9_9_REV;
1337       *comps = 3;
1338       return;
1339
1340    case MESA_FORMAT_R11G11B10_FLOAT:
1341       *datatype = GL_UNSIGNED_INT_10F_11F_11F_REV;
1342       *comps = 3;
1343       return;
1344
1345    case MESA_FORMAT_B10G10R10A2_UINT:
1346    case MESA_FORMAT_R10G10B10A2_UINT:
1347       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1348       *comps = 4;
1349       return;
1350
1351    case MESA_FORMAT_R8G8B8X8_SRGB:
1352    case MESA_FORMAT_X8B8G8R8_SRGB:
1353    case MESA_FORMAT_RGBX_UINT8:
1354       *datatype = GL_UNSIGNED_BYTE;
1355       *comps = 4;
1356       return;
1357
1358    case MESA_FORMAT_R8G8B8X8_SNORM:
1359    case MESA_FORMAT_RGBX_SINT8:
1360       *datatype = GL_BYTE;
1361       *comps = 4;
1362       return;
1363
1364    case MESA_FORMAT_B10G10R10X2_UNORM:
1365    case MESA_FORMAT_R10G10B10X2_UNORM:
1366       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1367       *comps = 4;
1368       return;
1369
1370    case MESA_FORMAT_RGBX_UNORM16:
1371    case MESA_FORMAT_RGBX_UINT16:
1372       *datatype = GL_UNSIGNED_SHORT;
1373       *comps = 4;
1374       return;
1375
1376    case MESA_FORMAT_RGBX_SNORM16:
1377    case MESA_FORMAT_RGBX_SINT16:
1378       *datatype = GL_SHORT;
1379       *comps = 4;
1380       return;
1381
1382    case MESA_FORMAT_RGBX_FLOAT16:
1383       *datatype = GL_HALF_FLOAT;
1384       *comps = 4;
1385       return;
1386
1387    case MESA_FORMAT_RGBX_FLOAT32:
1388       *datatype = GL_FLOAT;
1389       *comps = 4;
1390       return;
1391
1392    case MESA_FORMAT_RGBX_UINT32:
1393       *datatype = GL_UNSIGNED_INT;
1394       *comps = 4;
1395       return;
1396
1397    case MESA_FORMAT_RGBX_SINT32:
1398       *datatype = GL_INT;
1399       *comps = 4;
1400       return;
1401
1402    case MESA_FORMAT_R10G10B10A2_UNORM:
1403       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1404       *comps = 4;
1405       return;
1406
1407    case MESA_FORMAT_B8G8R8X8_SRGB:
1408    case MESA_FORMAT_X8R8G8B8_SRGB:
1409       *datatype = GL_UNSIGNED_BYTE;
1410       *comps = 4;
1411       return;
1412
1413    case MESA_FORMAT_COUNT:
1414       assert(0);
1415       return;
1416    default:
1417       /* Warn if any formats are not handled */
1418       _mesa_problem(NULL, "bad format %s in _mesa_uncompressed_format_to_type_and_comps",
1419                     _mesa_get_format_name(format));
1420       assert(format == MESA_FORMAT_NONE ||
1421              _mesa_is_format_compressed(format));
1422       *datatype = 0;
1423       *comps = 1;
1424    }
1425 }
1426
1427 /**
1428  * Check if a mesa_format exactly matches a GL format/type combination
1429  * such that we can use memcpy() from one to the other.
1430  * \param mesa_format  a MESA_FORMAT_x value
1431  * \param format  the user-specified image format
1432  * \param type  the user-specified image datatype
1433  * \param swapBytes  typically the current pixel pack/unpack byteswap state
1434  * \param[out] error GL_NO_ERROR if format is an expected input.
1435  *                   GL_INVALID_ENUM if format is an unexpected input.
1436  * \return true if the formats match, false otherwise.
1437  */
1438 bool
1439 _mesa_format_matches_format_and_type(mesa_format mformat,
1440                                      GLenum format, GLenum type,
1441                                      bool swapBytes, GLenum *error)
1442 {
1443    if (error)
1444       *error = GL_NO_ERROR;
1445
1446    if (_mesa_is_format_compressed(mformat)) {
1447       if (error)
1448          *error = GL_INVALID_ENUM;
1449       return false;
1450    }
1451
1452    if (swapBytes && !_mesa_swap_bytes_in_type_enum(&type))
1453       return false;
1454
1455    /* format/type don't include srgb and should match regardless of it. */
1456    mformat = _mesa_get_srgb_format_linear(mformat);
1457
1458    /* intensity formats are uploaded with GL_RED, and we want to find
1459     * memcpy matches for them.
1460     */
1461    mformat = _mesa_get_intensity_format_red(mformat);
1462
1463    if (format == GL_COLOR_INDEX)
1464       return false;
1465
1466    mesa_format other_format = _mesa_format_from_format_and_type(format, type);
1467    if (_mesa_format_is_mesa_array_format(other_format))
1468       other_format = _mesa_format_from_array_format(other_format);
1469
1470    return other_format == mformat;
1471 }
1472