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 "util/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
  89    /* The MESA_FORMAT_* enums are sparse, don't return a format info
  90     * for empty entries.
  91     */
  92    if (info->Name == MESA_FORMAT_NONE && format != MESA_FORMAT_NONE)
  93       return NULL;
  94
  95    assert(info->Name == format);
  96    return info;
  97 }
  98
  99
 100 /** Return string name of format (for debugging) */
 101 const char *
 102 _mesa_get_format_name(mesa_format format)
 103 {
 104    const struct mesa_format_info *info = _mesa_get_format_info(format);
 105    if (!info)
 106       return NULL;
 107    return info->StrName;
 108 }
 109
 110
 111
 112 /**
 113  * Return bytes needed to store a block of pixels in the given format.
 114  * Normally, a block is 1x1 (a single pixel).  But for compressed formats
 115  * a block may be 4x4 or 8x4, etc.
 116  *
 117  * Note: return is signed, so as not to coerce math to unsigned. cf. fdo #37351
 118  */
 119 int
 120 _mesa_get_format_bytes(mesa_format format)
 121 {
 122    if (_mesa_format_is_mesa_array_format(format)) {
 123       return _mesa_array_format_get_type_size(format) *
 124              _mesa_array_format_get_num_channels(format);
 125    }
 126
 127    const struct mesa_format_info *info = _mesa_get_format_info(format);
 128    assert(info->BytesPerBlock);
 129    assert(info->BytesPerBlock <= MAX_PIXEL_BYTES ||
 130           _mesa_is_format_compressed(format));
 131    return info->BytesPerBlock;
 132 }
 133
 134
 135 /**
 136  * Return bits per component for the given format.
 137  * \param format  one of MESA_FORMAT_x
 138  * \param pname  the component, such as GL_RED_BITS, GL_TEXTURE_BLUE_BITS, etc.
 139  */
 140 GLint
 141 _mesa_get_format_bits(mesa_format format, GLenum pname)
 142 {
 143    const struct mesa_format_info *info = _mesa_get_format_info(format);
 144
 145    switch (pname) {
 146    case GL_RED_BITS:
 147    case GL_TEXTURE_RED_SIZE:
 148    case GL_RENDERBUFFER_RED_SIZE_EXT:
 149    case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
 150    case GL_INTERNALFORMAT_RED_SIZE:
 151       return info->RedBits;
 152    case GL_GREEN_BITS:
 153    case GL_TEXTURE_GREEN_SIZE:
 154    case GL_RENDERBUFFER_GREEN_SIZE_EXT:
 155    case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
 156    case GL_INTERNALFORMAT_GREEN_SIZE:
 157       return info->GreenBits;
 158    case GL_BLUE_BITS:
 159    case GL_TEXTURE_BLUE_SIZE:
 160    case GL_RENDERBUFFER_BLUE_SIZE_EXT:
 161    case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
 162    case GL_INTERNALFORMAT_BLUE_SIZE:
 163       return info->BlueBits;
 164    case GL_ALPHA_BITS:
 165    case GL_TEXTURE_ALPHA_SIZE:
 166    case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
 167    case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
 168    case GL_INTERNALFORMAT_ALPHA_SIZE:
 169       return info->AlphaBits;
 170    case GL_TEXTURE_INTENSITY_SIZE:
 171       return info->IntensityBits;
 172    case GL_TEXTURE_LUMINANCE_SIZE:
 173       return info->LuminanceBits;
 174    case GL_INDEX_BITS:
 175       return 0;
 176    case GL_DEPTH_BITS:
 177    case GL_TEXTURE_DEPTH_SIZE_ARB:
 178    case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
 179    case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
 180    case GL_INTERNALFORMAT_DEPTH_SIZE:
 181       return info->DepthBits;
 182    case GL_STENCIL_BITS:
 183    case GL_TEXTURE_STENCIL_SIZE_EXT:
 184    case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
 185    case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
 186    case GL_INTERNALFORMAT_STENCIL_SIZE:
 187       return info->StencilBits;
 188    default:
 189       _mesa_problem(NULL, "bad pname in _mesa_get_format_bits()");
 190       return 0;
 191    }
 192 }
 193
 194
 195 unsigned int
 196 _mesa_get_format_max_bits(mesa_format format)
 197 {
 198    const struct mesa_format_info *info = _mesa_get_format_info(format);
 199    unsigned int max = MAX2(info->RedBits, info->GreenBits);
 200    max = MAX2(max, info->BlueBits);
 201    max = MAX2(max, info->AlphaBits);
 202    max = MAX2(max, info->LuminanceBits);
 203    max = MAX2(max, info->IntensityBits);
 204    max = MAX2(max, info->DepthBits);
 205    max = MAX2(max, info->StencilBits);
 206    return max;
 207 }
 208
 209
 210 /**
 211  * Return the layout type of the given format.
 212  */
 213 extern enum mesa_format_layout
 214 _mesa_get_format_layout(mesa_format format)
 215 {
 216    const struct mesa_format_info *info = _mesa_get_format_info(format);
 217    return info->Layout;
 218 }
 219
 220
 221 /**
 222  * Return the data type (or more specifically, the data representation)
 223  * for the given format.
 224  * The return value will be one of:
 225  *    GL_UNSIGNED_NORMALIZED = unsigned int representing [0,1]
 226  *    GL_SIGNED_NORMALIZED = signed int representing [-1, 1]
 227  *    GL_UNSIGNED_INT = an ordinary unsigned integer
 228  *    GL_INT = an ordinary signed integer
 229  *    GL_FLOAT = an ordinary float
 230  */
 231 GLenum
 232 _mesa_get_format_datatype(mesa_format format)
 233 {
 234    const struct mesa_format_info *info = _mesa_get_format_info(format);
 235    return info->DataType;
 236 }
 237
 238 static GLenum
 239 get_base_format_for_array_format(mesa_array_format format)
 240 {
 241    uint8_t swizzle[4];
 242    int num_channels;
 243
 244    switch (_mesa_array_format_get_base_format(format)) {
 245    case MESA_ARRAY_FORMAT_BASE_FORMAT_DEPTH:
 246       return GL_DEPTH_COMPONENT;
 247    case MESA_ARRAY_FORMAT_BASE_FORMAT_STENCIL:
 248       return GL_STENCIL_INDEX;
 249    case MESA_ARRAY_FORMAT_BASE_FORMAT_RGBA_VARIANTS:
 250       break;
 251    }
 252
 253    _mesa_array_format_get_swizzle(format, swizzle);
 254    num_channels = _mesa_array_format_get_num_channels(format);
 255
 256    switch (num_channels) {
 257    case 4:
 258       /* FIXME: RGBX formats have 4 channels, but their base format is GL_RGB.
 259        * This is not really a problem for now because we only create array
 260        * formats from GL format/type combinations, and these cannot specify
 261        * RGBX formats.
 262        */
 263       return GL_RGBA;
 264    case 3:
 265       return GL_RGB;
 266    case 2:
 267       if (swizzle[0] == 0 &&
 268           swizzle[1] == 0 &&
 269           swizzle[2] == 0 &&
 270           swizzle[3] == 1)
 271          return GL_LUMINANCE_ALPHA;
 272       if (swizzle[0] == 1 &&
 273           swizzle[1] == 1 &&
 274           swizzle[2] == 1 &&
 275           swizzle[3] == 0)
 276          return GL_LUMINANCE_ALPHA;
 277       if (swizzle[0] == 0 &&
 278           swizzle[1] == 1 &&
 279           swizzle[2] == 4 &&
 280           swizzle[3] == 5)
 281          return GL_RG;
 282       if (swizzle[0] == 1 &&
 283           swizzle[1] == 0 &&
 284           swizzle[2] == 4 &&
 285           swizzle[3] == 5)
 286          return GL_RG;
 287       break;
 288    case 1:
 289       if (swizzle[0] == 0 &&
 290           swizzle[1] == 0 &&
 291           swizzle[2] == 0 &&
 292           swizzle[3] == 5)
 293          return GL_LUMINANCE;
 294       if (swizzle[0] == 0 &&
 295           swizzle[1] == 0 &&
 296           swizzle[2] == 0 &&
 297           swizzle[3] == 0)
 298          return GL_INTENSITY;
 299       if (swizzle[0] <= MESA_FORMAT_SWIZZLE_W)
 300          return GL_RED;
 301       if (swizzle[1] <= MESA_FORMAT_SWIZZLE_W)
 302          return GL_GREEN;
 303       if (swizzle[2] <= MESA_FORMAT_SWIZZLE_W)
 304          return GL_BLUE;
 305       if (swizzle[3] <= MESA_FORMAT_SWIZZLE_W)
 306          return GL_ALPHA;
 307       break;
 308    }
 309
 310    unreachable("Unsupported format");
 311 }
 312
 313 /**
 314  * Return the basic format for the given type.  The result will be one of
 315  * GL_RGB, GL_RGBA, GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY,
 316  * GL_YCBCR_MESA, GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
 317  * This functions accepts a mesa_format or a mesa_array_format.
 318  */
 319 GLenum
 320 _mesa_get_format_base_format(uint32_t format)
 321 {
 322    if (!_mesa_format_is_mesa_array_format(format)) {
 323       const struct mesa_format_info *info = _mesa_get_format_info(format);
 324       return info->BaseFormat;
 325    } else {
 326       return get_base_format_for_array_format(format);
 327    }
 328 }
 329
 330
 331 /**
 332  * Return the block size (in pixels) for the given format.  Normally
 333  * the block size is 1x1.  But compressed formats will have block sizes
 334  * of 4x4 or 8x4 pixels, etc.
 335  * \param bw  returns block width in pixels
 336  * \param bh  returns block height in pixels
 337  */
 338 void
 339 _mesa_get_format_block_size(mesa_format format,
 340                             unsigned int *bw, unsigned int *bh)
 341 {
 342    const struct mesa_format_info *info = _mesa_get_format_info(format);
 343    /* Use _mesa_get_format_block_size_3d() for 3D blocks. */
 344    assert(info->BlockDepth == 1);
 345
 346    *bw = info->BlockWidth;
 347    *bh = info->BlockHeight;
 348 }
 349
 350
 351 /**
 352  * Return the block size (in pixels) for the given format. Normally
 353  * the block size is 1x1x1. But compressed formats will have block
 354  * sizes of 4x4x4, 3x3x3 pixels, etc.
 355  * \param bw  returns block width in pixels
 356  * \param bh  returns block height in pixels
 357  * \param bd  returns block depth in pixels
 358  */
 359 void
 360 _mesa_get_format_block_size_3d(mesa_format format,
 361                                unsigned int *bw,
 362                                unsigned int *bh,
 363                                unsigned int *bd)
 364 {
 365    const struct mesa_format_info *info = _mesa_get_format_info(format);
 366    *bw = info->BlockWidth;
 367    *bh = info->BlockHeight;
 368    *bd = info->BlockDepth;
 369 }
 370
 371
 372 /**
 373  * Returns the an array of four numbers representing the transformation
 374  * from the RGBA or SZ colorspace to the given format.  For array formats,
 375  * the i'th RGBA component is given by:
 376  *
 377  * if (swizzle[i] <= MESA_FORMAT_SWIZZLE_W)
 378  *    comp = data[swizzle[i]];
 379  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ZERO)
 380  *    comp = 0;
 381  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ONE)
 382  *    comp = 1;
 383  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_NONE)
 384  *    // data does not contain a channel of this format
 385  *
 386  * For packed formats, the swizzle gives the number of components left of
 387  * the least significant bit.
 388  *
 389  * Compressed formats have no swizzle.
 390  */
 391 void
 392 _mesa_get_format_swizzle(mesa_format format, uint8_t swizzle_out[4])
 393 {
 394    const struct mesa_format_info *info = _mesa_get_format_info(format);
 395    memcpy(swizzle_out, info->Swizzle, sizeof(info->Swizzle));
 396 }
 397
 398 mesa_array_format
 399 _mesa_array_format_flip_channels(mesa_array_format format)
 400 {
 401    int num_channels;
 402    uint8_t swizzle[4];
 403
 404    num_channels = _mesa_array_format_get_num_channels(format);
 405    _mesa_array_format_get_swizzle(format, swizzle);
 406
 407    if (num_channels == 1)
 408       return format;
 409
 410    if (num_channels == 2) {
 411       /* Assert that the swizzle makes sense for 2 channels */
 412       for (unsigned i = 0; i < 4; i++)
 413          assert(swizzle[i] != 2 && swizzle[i] != 3);
 414
 415       static const uint8_t flip_xy[6] = { 1, 0, 2, 3, 4, 5 };
 416       _mesa_array_format_set_swizzle(&format,
 417                                      flip_xy[swizzle[0]], flip_xy[swizzle[1]],
 418                                      flip_xy[swizzle[2]], flip_xy[swizzle[3]]);
 419       return format;
 420    }
 421
 422    if (num_channels == 4) {
 423       static const uint8_t flip[6] = { 3, 2, 1, 0, 4, 5 };
 424       _mesa_array_format_set_swizzle(&format,
 425                                      flip[swizzle[0]], flip[swizzle[1]],
 426                                      flip[swizzle[2]], flip[swizzle[3]]);
 427       return format;
 428    }
 429
 430    unreachable("Invalid array format");
 431 }
 432
 433 uint32_t
 434 _mesa_format_to_array_format(mesa_format format)
 435 {
 436    const struct mesa_format_info *info = _mesa_get_format_info(format);
 437 #if UTIL_ARCH_BIG_ENDIAN
 438    if (info->ArrayFormat && info->Layout == MESA_FORMAT_LAYOUT_PACKED)
 439       return _mesa_array_format_flip_channels(info->ArrayFormat);
 440    else
 441 #endif
 442       return info->ArrayFormat;
 443 }
 444
 445 static struct hash_table *format_array_format_table;
 446 static once_flag format_array_format_table_exists = ONCE_FLAG_INIT;
 447
 448 static void
 449 format_array_format_table_destroy(void)
 450 {
 451    _mesa_hash_table_destroy(format_array_format_table, NULL);
 452 }
 453
 454 static bool
 455 array_formats_equal(const void *a, const void *b)
 456 {
 457    return (intptr_t)a == (intptr_t)b;
 458 }
 459
 460 static void
 461 format_array_format_table_init(void)
 462 {
 463    const struct mesa_format_info *info;
 464    mesa_array_format array_format;
 465    unsigned f;
 466
 467    format_array_format_table = _mesa_hash_table_create(NULL, NULL,
 468                                                        array_formats_equal);
 469
 470    if (!format_array_format_table) {
 471       _mesa_error_no_memory(__func__);
 472       return;
 473    }
 474
 475    for (f = 1; f < MESA_FORMAT_COUNT; ++f) {
 476       info = _mesa_get_format_info(f);
 477       if (!info || !info->ArrayFormat)
 478          continue;
 479
 480       /* All sRGB formats should have an equivalent UNORM format, and that's
 481        * the one we want in the table.
 482        */
 483       if (_mesa_is_format_srgb(f))
 484          continue;
 485
 486 #if UTIL_ARCH_LITTLE_ENDIAN
 487          array_format = info->ArrayFormat;
 488 #else
 489          array_format = _mesa_array_format_flip_channels(info->ArrayFormat);
 490 #endif
 491
 492       _mesa_hash_table_insert_pre_hashed(format_array_format_table,
 493                                          array_format,
 494                                          (void *)(intptr_t)array_format,
 495                                          (void *)(intptr_t)f);
 496    }
 497
 498    atexit(format_array_format_table_destroy);
 499 }
 500
 501 mesa_format
 502 _mesa_format_from_array_format(uint32_t array_format)
 503 {
 504    struct hash_entry *entry;
 505
 506    assert(_mesa_format_is_mesa_array_format(array_format));
 507
 508    call_once(&format_array_format_table_exists, format_array_format_table_init);
 509
 510    if (!format_array_format_table) {
 511       static const once_flag once_flag_init = ONCE_FLAG_INIT;
 512       format_array_format_table_exists = once_flag_init;
 513       return MESA_FORMAT_NONE;
 514    }
 515
 516    entry = _mesa_hash_table_search_pre_hashed(format_array_format_table,
 517                                               array_format,
 518                                               (void *)(intptr_t)array_format);
 519    if (entry)
 520       return (intptr_t)entry->data;
 521    else
 522       return MESA_FORMAT_NONE;
 523 }
 524
 525 /** Is the given format a compressed format? */
 526 bool
 527 _mesa_is_format_compressed(mesa_format format)
 528 {
 529    const struct mesa_format_info *info = _mesa_get_format_info(format);
 530    return info->BlockWidth > 1 || info->BlockHeight > 1;
 531 }
 532
 533
 534 /**
 535  * Determine if the given format represents a packed depth/stencil buffer.
 536  */
 537 bool
 538 _mesa_is_format_packed_depth_stencil(mesa_format format)
 539 {
 540    const struct mesa_format_info *info = _mesa_get_format_info(format);
 541
 542    return info->BaseFormat == GL_DEPTH_STENCIL;
 543 }
 544
 545
 546 /**
 547  * Is the given format a signed/unsigned integer color format?
 548  */
 549 bool
 550 _mesa_is_format_integer_color(mesa_format format)
 551 {
 552    const struct mesa_format_info *info = _mesa_get_format_info(format);
 553    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT) &&
 554       info->BaseFormat != GL_DEPTH_COMPONENT &&
 555       info->BaseFormat != GL_DEPTH_STENCIL &&
 556       info->BaseFormat != GL_STENCIL_INDEX;
 557 }
 558
 559
 560 /**
 561  * Is the given format an unsigned integer format?
 562  */
 563 bool
 564 _mesa_is_format_unsigned(mesa_format format)
 565 {
 566    const struct mesa_format_info *info = _mesa_get_format_info(format);
 567    return _mesa_is_type_unsigned(info->DataType);
 568 }
 569
 570
 571 /**
 572  * Does the given format store signed values?
 573  */
 574 bool
 575 _mesa_is_format_signed(mesa_format format)
 576 {
 577    if (format == MESA_FORMAT_R11G11B10_FLOAT ||
 578        format == MESA_FORMAT_R9G9B9E5_FLOAT) {
 579       /* these packed float formats only store unsigned values */
 580       return false;
 581    }
 582    else {
 583       const struct mesa_format_info *info = _mesa_get_format_info(format);
 584       return (info->DataType == GL_SIGNED_NORMALIZED ||
 585               info->DataType == GL_INT ||
 586               info->DataType == GL_FLOAT);
 587    }
 588 }
 589
 590 /**
 591  * Is the given format an integer format?
 592  */
 593 bool
 594 _mesa_is_format_integer(mesa_format format)
 595 {
 596    const struct mesa_format_info *info = _mesa_get_format_info(format);
 597    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT);
 598 }
 599
 600
 601 /**
 602  * Return true if the given format is a color format.
 603  */
 604 bool
 605 _mesa_is_format_color_format(mesa_format format)
 606 {
 607    const struct mesa_format_info *info = _mesa_get_format_info(format);
 608    switch (info->BaseFormat) {
 609    case GL_DEPTH_COMPONENT:
 610    case GL_STENCIL_INDEX:
 611    case GL_DEPTH_STENCIL:
 612       return false;
 613    default:
 614       return true;
 615    }
 616 }
 617
 618 bool
 619 _mesa_is_format_srgb(mesa_format format)
 620 {
 621    const struct mesa_format_info *info = _mesa_get_format_info(format);
 622    return info->IsSRGBFormat;
 623 }
 624
 625 /**
 626  * Return TRUE if format is an ETC2 compressed format specified
 627  * by GL_ARB_ES3_compatibility.
 628  */
 629 bool
 630 _mesa_is_format_etc2(mesa_format format)
 631 {
 632    switch (format) {
 633    case MESA_FORMAT_ETC2_RGB8:
 634    case MESA_FORMAT_ETC2_SRGB8:
 635    case MESA_FORMAT_ETC2_RGBA8_EAC:
 636    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 637    case MESA_FORMAT_ETC2_R11_EAC:
 638    case MESA_FORMAT_ETC2_RG11_EAC:
 639    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 640    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 641    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 642    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 643       return true;
 644    default:
 645       return false;
 646    }
 647 }
 648
 649
 650 /**
 651  * Return TRUE if format is an ASTC 2D compressed format.
 652  */
 653 bool
 654 _mesa_is_format_astc_2d(mesa_format format)
 655 {
 656    switch (format) {
 657    case MESA_FORMAT_RGBA_ASTC_4x4:
 658    case MESA_FORMAT_RGBA_ASTC_5x4:
 659    case MESA_FORMAT_RGBA_ASTC_5x5:
 660    case MESA_FORMAT_RGBA_ASTC_6x5:
 661    case MESA_FORMAT_RGBA_ASTC_6x6:
 662    case MESA_FORMAT_RGBA_ASTC_8x5:
 663    case MESA_FORMAT_RGBA_ASTC_8x6:
 664    case MESA_FORMAT_RGBA_ASTC_8x8:
 665    case MESA_FORMAT_RGBA_ASTC_10x5:
 666    case MESA_FORMAT_RGBA_ASTC_10x6:
 667    case MESA_FORMAT_RGBA_ASTC_10x8:
 668    case MESA_FORMAT_RGBA_ASTC_10x10:
 669    case MESA_FORMAT_RGBA_ASTC_12x10:
 670    case MESA_FORMAT_RGBA_ASTC_12x12:
 671    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4:
 672    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x4:
 673    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5:
 674    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x5:
 675    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6:
 676    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x5:
 677    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x6:
 678    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x8:
 679    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x5:
 680    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x6:
 681    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x8:
 682    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x10:
 683    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x10:
 684    case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x12:
 685       return true;
 686    default:
 687       return false;
 688    }
 689 }
 690
 691
 692 /**
 693  * If the given format is a compressed format, return a corresponding
 694  * uncompressed format.
 695  */
 696 mesa_format
 697 _mesa_get_uncompressed_format(mesa_format format)
 698 {
 699    switch (format) {
 700    case MESA_FORMAT_RGB_FXT1:
 701       return MESA_FORMAT_BGR_UNORM8;
 702    case MESA_FORMAT_RGBA_FXT1:
 703       return MESA_FORMAT_A8B8G8R8_UNORM;
 704    case MESA_FORMAT_RGB_DXT1:
 705    case MESA_FORMAT_SRGB_DXT1:
 706       return MESA_FORMAT_BGR_UNORM8;
 707    case MESA_FORMAT_RGBA_DXT1:
 708    case MESA_FORMAT_SRGBA_DXT1:
 709       return MESA_FORMAT_A8B8G8R8_UNORM;
 710    case MESA_FORMAT_RGBA_DXT3:
 711    case MESA_FORMAT_SRGBA_DXT3:
 712       return MESA_FORMAT_A8B8G8R8_UNORM;
 713    case MESA_FORMAT_RGBA_DXT5:
 714    case MESA_FORMAT_SRGBA_DXT5:
 715       return MESA_FORMAT_A8B8G8R8_UNORM;
 716    case MESA_FORMAT_R_RGTC1_UNORM:
 717       return MESA_FORMAT_R_UNORM8;
 718    case MESA_FORMAT_R_RGTC1_SNORM:
 719       return MESA_FORMAT_R_SNORM8;
 720    case MESA_FORMAT_RG_RGTC2_UNORM:
 721       return MESA_FORMAT_RG_UNORM8;
 722    case MESA_FORMAT_RG_RGTC2_SNORM:
 723       return MESA_FORMAT_RG_SNORM8;
 724    case MESA_FORMAT_L_LATC1_UNORM:
 725       return MESA_FORMAT_L_UNORM8;
 726    case MESA_FORMAT_L_LATC1_SNORM:
 727       return MESA_FORMAT_L_SNORM8;
 728    case MESA_FORMAT_LA_LATC2_UNORM:
 729       return MESA_FORMAT_LA_UNORM8;
 730    case MESA_FORMAT_LA_LATC2_SNORM:
 731       return MESA_FORMAT_LA_SNORM8;
 732    case MESA_FORMAT_ETC1_RGB8:
 733    case MESA_FORMAT_ETC2_RGB8:
 734    case MESA_FORMAT_ETC2_SRGB8:
 735    case MESA_FORMAT_ATC_RGB:
 736       return MESA_FORMAT_BGR_UNORM8;
 737    case MESA_FORMAT_ETC2_RGBA8_EAC:
 738    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 739    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 740    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 741    case MESA_FORMAT_ATC_RGBA_EXPLICIT:
 742    case MESA_FORMAT_ATC_RGBA_INTERPOLATED:
 743       return MESA_FORMAT_A8B8G8R8_UNORM;
 744    case MESA_FORMAT_ETC2_R11_EAC:
 745    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 746       return MESA_FORMAT_R_UNORM16;
 747    case MESA_FORMAT_ETC2_RG11_EAC:
 748    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 749       return MESA_FORMAT_RG_UNORM16;
 750    case MESA_FORMAT_BPTC_RGBA_UNORM:
 751    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 752       return MESA_FORMAT_A8B8G8R8_UNORM;
 753    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
 754    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
 755       return MESA_FORMAT_RGB_FLOAT32;
 756    default:
 757       assert(!_mesa_is_format_compressed(format));
 758       return format;
 759    }
 760 }
 761
 762
 763 unsigned int
 764 _mesa_format_num_components(mesa_format format)
 765 {
 766    const struct mesa_format_info *info = _mesa_get_format_info(format);
 767    return ((info->RedBits > 0) +
 768            (info->GreenBits > 0) +
 769            (info->BlueBits > 0) +
 770            (info->AlphaBits > 0) +
 771            (info->LuminanceBits > 0) +
 772            (info->IntensityBits > 0) +
 773            (info->DepthBits > 0) +
 774            (info->StencilBits > 0));
 775 }
 776
 777
 778 /**
 779  * Returns true if a color format has data stored in the R/G/B/A channels,
 780  * given an index from 0 to 3.
 781  */
 782 bool
 783 _mesa_format_has_color_component(mesa_format format, int component)
 784 {
 785    const struct mesa_format_info *info = _mesa_get_format_info(format);
 786
 787    assert(info->BaseFormat != GL_DEPTH_COMPONENT &&
 788           info->BaseFormat != GL_DEPTH_STENCIL &&
 789           info->BaseFormat != GL_STENCIL_INDEX);
 790
 791    switch (component) {
 792    case 0:
 793       return (info->RedBits + info->IntensityBits + info->LuminanceBits) > 0;
 794    case 1:
 795       return (info->GreenBits + info->IntensityBits + info->LuminanceBits) > 0;
 796    case 2:
 797       return (info->BlueBits + info->IntensityBits + info->LuminanceBits) > 0;
 798    case 3:
 799       return (info->AlphaBits + info->IntensityBits) > 0;
 800    default:
 801       assert(!"Invalid color component: must be 0..3");
 802       return false;
 803    }
 804 }
 805
 806
 807 /**
 808  * Return number of bytes needed to store an image of the given size
 809  * in the given format.
 810  */
 811 uint32_t
 812 _mesa_format_image_size(mesa_format format, int width,
 813                         int height, int depth)
 814 {
 815    const struct mesa_format_info *info = _mesa_get_format_info(format);
 816    uint32_t sz;
 817    /* Strictly speaking, a conditional isn't needed here */
 818    if (info->BlockWidth > 1 || info->BlockHeight > 1 || info->BlockDepth > 1) {
 819       /* compressed format (2D only for now) */
 820       const uint32_t bw = info->BlockWidth;
 821       const uint32_t bh = info->BlockHeight;
 822       const uint32_t bd = info->BlockDepth;
 823       const uint32_t wblocks = (width + bw - 1) / bw;
 824       const uint32_t hblocks = (height + bh - 1) / bh;
 825       const uint32_t dblocks = (depth + bd - 1) / bd;
 826       sz = wblocks * hblocks * dblocks * info->BytesPerBlock;
 827    } else
 828       /* non-compressed */
 829       sz = width * height * depth * info->BytesPerBlock;
 830
 831    return sz;
 832 }
 833
 834
 835 /**
 836  * Same as _mesa_format_image_size() but returns a 64-bit value to
 837  * accommodate very large textures.
 838  */
 839 uint64_t
 840 _mesa_format_image_size64(mesa_format format, int width,
 841                           int height, int depth)
 842 {
 843    const struct mesa_format_info *info = _mesa_get_format_info(format);
 844    uint64_t sz;
 845    /* Strictly speaking, a conditional isn't needed here */
 846    if (info->BlockWidth > 1 || info->BlockHeight > 1 || info->BlockDepth > 1) {
 847       /* compressed format (2D only for now) */
 848       const uint64_t bw = info->BlockWidth;
 849       const uint64_t bh = info->BlockHeight;
 850       const uint64_t bd = info->BlockDepth;
 851       const uint64_t wblocks = (width + bw - 1) / bw;
 852       const uint64_t hblocks = (height + bh - 1) / bh;
 853       const uint64_t dblocks = (depth + bd - 1) / bd;
 854       sz = wblocks * hblocks * dblocks * info->BytesPerBlock;
 855    } else
 856       /* non-compressed */
 857       sz = ((uint64_t) width * (uint64_t) height *
 858             (uint64_t) depth * info->BytesPerBlock);
 859
 860    return sz;
 861 }
 862
 863
 864
 865 int32_t
 866 _mesa_format_row_stride(mesa_format format, int width)
 867 {
 868    const struct mesa_format_info *info = _mesa_get_format_info(format);
 869    /* Strictly speaking, a conditional isn't needed here */
 870    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 871       /* compressed format */
 872       const uint32_t bw = info->BlockWidth;
 873       const uint32_t wblocks = (width + bw - 1) / bw;
 874       const int32_t stride = wblocks * info->BytesPerBlock;
 875       return stride;
 876    }
 877    else {
 878       const int32_t stride = width * info->BytesPerBlock;
 879       return stride;
 880    }
 881 }
 882
 883
 884
 885 /**
 886  * Return datatype and number of components per texel for the given
 887  * uncompressed mesa_format. Only used for mipmap generation code.
 888  */
 889 void
 890 _mesa_uncompressed_format_to_type_and_comps(mesa_format format,
 891                                GLenum *datatype, GLuint *comps)
 892 {
 893    switch (format) {
 894    case MESA_FORMAT_A8B8G8R8_UNORM:
 895    case MESA_FORMAT_R8G8B8A8_UNORM:
 896    case MESA_FORMAT_B8G8R8A8_UNORM:
 897    case MESA_FORMAT_A8R8G8B8_UNORM:
 898    case MESA_FORMAT_X8B8G8R8_UNORM:
 899    case MESA_FORMAT_R8G8B8X8_UNORM:
 900    case MESA_FORMAT_B8G8R8X8_UNORM:
 901    case MESA_FORMAT_X8R8G8B8_UNORM:
 902    case MESA_FORMAT_A8B8G8R8_UINT:
 903    case MESA_FORMAT_R8G8B8A8_UINT:
 904    case MESA_FORMAT_B8G8R8A8_UINT:
 905    case MESA_FORMAT_A8R8G8B8_UINT:
 906       *datatype = GL_UNSIGNED_BYTE;
 907       *comps = 4;
 908       return;
 909    case MESA_FORMAT_BGR_UNORM8:
 910    case MESA_FORMAT_RGB_UNORM8:
 911       *datatype = GL_UNSIGNED_BYTE;
 912       *comps = 3;
 913       return;
 914    case MESA_FORMAT_B5G6R5_UNORM:
 915    case MESA_FORMAT_R5G6B5_UNORM:
 916    case MESA_FORMAT_B5G6R5_UINT:
 917    case MESA_FORMAT_R5G6B5_UINT:
 918       *datatype = GL_UNSIGNED_SHORT_5_6_5;
 919       *comps = 3;
 920       return;
 921
 922    case MESA_FORMAT_B4G4R4A4_UNORM:
 923    case MESA_FORMAT_A4R4G4B4_UNORM:
 924    case MESA_FORMAT_B4G4R4X4_UNORM:
 925    case MESA_FORMAT_B4G4R4A4_UINT:
 926    case MESA_FORMAT_A4R4G4B4_UINT:
 927       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 928       *comps = 4;
 929       return;
 930
 931    case MESA_FORMAT_B5G5R5A1_UNORM:
 932    case MESA_FORMAT_A1R5G5B5_UNORM:
 933    case MESA_FORMAT_B5G5R5X1_UNORM:
 934    case MESA_FORMAT_B5G5R5A1_UINT:
 935    case MESA_FORMAT_A1R5G5B5_UINT:
 936       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 937       *comps = 4;
 938       return;
 939
 940    case MESA_FORMAT_B10G10R10A2_UNORM:
 941       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
 942       *comps = 4;
 943       return;
 944
 945    case MESA_FORMAT_A1B5G5R5_UNORM:
 946    case MESA_FORMAT_A1B5G5R5_UINT:
 947    case MESA_FORMAT_X1B5G5R5_UNORM:
 948       *datatype = GL_UNSIGNED_SHORT_5_5_5_1;
 949       *comps = 4;
 950       return;
 951
 952    case MESA_FORMAT_L4A4_UNORM:
 953       *datatype = MESA_UNSIGNED_BYTE_4_4;
 954       *comps = 2;
 955       return;
 956
 957    case MESA_FORMAT_LA_UNORM8:
 958    case MESA_FORMAT_RG_UNORM8:
 959       *datatype = GL_UNSIGNED_BYTE;
 960       *comps = 2;
 961       return;
 962
 963    case MESA_FORMAT_LA_UNORM16:
 964    case MESA_FORMAT_RG_UNORM16:
 965       *datatype = GL_UNSIGNED_SHORT;
 966       *comps = 2;
 967       return;
 968
 969    case MESA_FORMAT_R_UNORM16:
 970    case MESA_FORMAT_A_UNORM16:
 971    case MESA_FORMAT_L_UNORM16:
 972    case MESA_FORMAT_I_UNORM16:
 973       *datatype = GL_UNSIGNED_SHORT;
 974       *comps = 1;
 975       return;
 976
 977    case MESA_FORMAT_R3G3B2_UNORM:
 978    case MESA_FORMAT_R3G3B2_UINT:
 979       *datatype = GL_UNSIGNED_BYTE_2_3_3_REV;
 980       *comps = 3;
 981       return;
 982    case MESA_FORMAT_A4B4G4R4_UNORM:
 983    case MESA_FORMAT_A4B4G4R4_UINT:
 984       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 985       *comps = 4;
 986       return;
 987
 988    case MESA_FORMAT_R4G4B4A4_UNORM:
 989    case MESA_FORMAT_R4G4B4A4_UINT:
 990       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 991       *comps = 4;
 992       return;
 993    case MESA_FORMAT_R5G5B5A1_UNORM:
 994    case MESA_FORMAT_R5G5B5A1_UINT:
 995       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 996       *comps = 4;
 997       return;
 998    case MESA_FORMAT_A2B10G10R10_UNORM:
 999    case MESA_FORMAT_A2B10G10R10_UINT:
1000       *datatype = GL_UNSIGNED_INT_10_10_10_2;
1001       *comps = 4;
1002       return;
1003    case MESA_FORMAT_A2R10G10B10_UNORM:
1004    case MESA_FORMAT_A2R10G10B10_UINT:
1005       *datatype = GL_UNSIGNED_INT_10_10_10_2;
1006       *comps = 4;
1007       return;
1008
1009    case MESA_FORMAT_B2G3R3_UNORM:
1010    case MESA_FORMAT_B2G3R3_UINT:
1011       *datatype = GL_UNSIGNED_BYTE_3_3_2;
1012       *comps = 3;
1013       return;
1014
1015    case MESA_FORMAT_A_UNORM8:
1016    case MESA_FORMAT_L_UNORM8:
1017    case MESA_FORMAT_I_UNORM8:
1018    case MESA_FORMAT_R_UNORM8:
1019    case MESA_FORMAT_S_UINT8:
1020       *datatype = GL_UNSIGNED_BYTE;
1021       *comps = 1;
1022       return;
1023
1024    case MESA_FORMAT_YCBCR:
1025    case MESA_FORMAT_YCBCR_REV:
1026       *datatype = GL_UNSIGNED_SHORT;
1027       *comps = 2;
1028       return;
1029
1030    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1031       *datatype = GL_UNSIGNED_INT_24_8_MESA;
1032       *comps = 2;
1033       return;
1034
1035    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1036       *datatype = GL_UNSIGNED_INT_8_24_REV_MESA;
1037       *comps = 2;
1038       return;
1039
1040    case MESA_FORMAT_Z_UNORM16:
1041       *datatype = GL_UNSIGNED_SHORT;
1042       *comps = 1;
1043       return;
1044
1045    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1046       *datatype = GL_UNSIGNED_INT;
1047       *comps = 1;
1048       return;
1049
1050    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1051       *datatype = GL_UNSIGNED_INT;
1052       *comps = 1;
1053       return;
1054
1055    case MESA_FORMAT_Z_UNORM32:
1056       *datatype = GL_UNSIGNED_INT;
1057       *comps = 1;
1058       return;
1059
1060    case MESA_FORMAT_Z_FLOAT32:
1061       *datatype = GL_FLOAT;
1062       *comps = 1;
1063       return;
1064
1065    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
1066       *datatype = GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
1067       *comps = 1;
1068       return;
1069
1070    case MESA_FORMAT_R_SNORM8:
1071    case MESA_FORMAT_A_SNORM8:
1072    case MESA_FORMAT_L_SNORM8:
1073    case MESA_FORMAT_I_SNORM8:
1074       *datatype = GL_BYTE;
1075       *comps = 1;
1076       return;
1077    case MESA_FORMAT_RG_SNORM8:
1078    case MESA_FORMAT_LA_SNORM8:
1079       *datatype = GL_BYTE;
1080       *comps = 2;
1081       return;
1082    case MESA_FORMAT_A8B8G8R8_SNORM:
1083    case MESA_FORMAT_R8G8B8A8_SNORM:
1084    case MESA_FORMAT_X8B8G8R8_SNORM:
1085       *datatype = GL_BYTE;
1086       *comps = 4;
1087       return;
1088
1089    case MESA_FORMAT_RGBA_UNORM16:
1090       *datatype = GL_UNSIGNED_SHORT;
1091       *comps = 4;
1092       return;
1093
1094    case MESA_FORMAT_R_SNORM16:
1095    case MESA_FORMAT_A_SNORM16:
1096    case MESA_FORMAT_L_SNORM16:
1097    case MESA_FORMAT_I_SNORM16:
1098       *datatype = GL_SHORT;
1099       *comps = 1;
1100       return;
1101    case MESA_FORMAT_RG_SNORM16:
1102    case MESA_FORMAT_LA_SNORM16:
1103       *datatype = GL_SHORT;
1104       *comps = 2;
1105       return;
1106    case MESA_FORMAT_RGB_SNORM16:
1107       *datatype = GL_SHORT;
1108       *comps = 3;
1109       return;
1110    case MESA_FORMAT_RGBA_SNORM16:
1111       *datatype = GL_SHORT;
1112       *comps = 4;
1113       return;
1114
1115    case MESA_FORMAT_BGR_SRGB8:
1116       *datatype = GL_UNSIGNED_BYTE;
1117       *comps = 3;
1118       return;
1119    case MESA_FORMAT_A8B8G8R8_SRGB:
1120    case MESA_FORMAT_B8G8R8A8_SRGB:
1121    case MESA_FORMAT_A8R8G8B8_SRGB:
1122    case MESA_FORMAT_R8G8B8A8_SRGB:
1123       *datatype = GL_UNSIGNED_BYTE;
1124       *comps = 4;
1125       return;
1126    case MESA_FORMAT_L_SRGB8:
1127    case MESA_FORMAT_R_SRGB8:
1128       *datatype = GL_UNSIGNED_BYTE;
1129       *comps = 1;
1130       return;
1131    case MESA_FORMAT_LA_SRGB8:
1132       *datatype = GL_UNSIGNED_BYTE;
1133       *comps = 2;
1134       return;
1135
1136    case MESA_FORMAT_RGBA_FLOAT32:
1137       *datatype = GL_FLOAT;
1138       *comps = 4;
1139       return;
1140    case MESA_FORMAT_RGBA_FLOAT16:
1141       *datatype = GL_HALF_FLOAT_ARB;
1142       *comps = 4;
1143       return;
1144    case MESA_FORMAT_RGB_FLOAT32:
1145       *datatype = GL_FLOAT;
1146       *comps = 3;
1147       return;
1148    case MESA_FORMAT_RGB_FLOAT16:
1149       *datatype = GL_HALF_FLOAT_ARB;
1150       *comps = 3;
1151       return;
1152    case MESA_FORMAT_LA_FLOAT32:
1153    case MESA_FORMAT_RG_FLOAT32:
1154       *datatype = GL_FLOAT;
1155       *comps = 2;
1156       return;
1157    case MESA_FORMAT_LA_FLOAT16:
1158    case MESA_FORMAT_RG_FLOAT16:
1159       *datatype = GL_HALF_FLOAT_ARB;
1160       *comps = 2;
1161       return;
1162    case MESA_FORMAT_A_FLOAT32:
1163    case MESA_FORMAT_L_FLOAT32:
1164    case MESA_FORMAT_I_FLOAT32:
1165    case MESA_FORMAT_R_FLOAT32:
1166       *datatype = GL_FLOAT;
1167       *comps = 1;
1168       return;
1169    case MESA_FORMAT_A_FLOAT16:
1170    case MESA_FORMAT_L_FLOAT16:
1171    case MESA_FORMAT_I_FLOAT16:
1172    case MESA_FORMAT_R_FLOAT16:
1173       *datatype = GL_HALF_FLOAT_ARB;
1174       *comps = 1;
1175       return;
1176
1177    case MESA_FORMAT_A_UINT8:
1178    case MESA_FORMAT_L_UINT8:
1179    case MESA_FORMAT_I_UINT8:
1180       *datatype = GL_UNSIGNED_BYTE;
1181       *comps = 1;
1182       return;
1183    case MESA_FORMAT_LA_UINT8:
1184       *datatype = GL_UNSIGNED_BYTE;
1185       *comps = 2;
1186       return;
1187
1188    case MESA_FORMAT_A_UINT16:
1189    case MESA_FORMAT_L_UINT16:
1190    case MESA_FORMAT_I_UINT16:
1191       *datatype = GL_UNSIGNED_SHORT;
1192       *comps = 1;
1193       return;
1194    case MESA_FORMAT_LA_UINT16:
1195       *datatype = GL_UNSIGNED_SHORT;
1196       *comps = 2;
1197       return;
1198    case MESA_FORMAT_A_UINT32:
1199    case MESA_FORMAT_L_UINT32:
1200    case MESA_FORMAT_I_UINT32:
1201       *datatype = GL_UNSIGNED_INT;
1202       *comps = 1;
1203       return;
1204    case MESA_FORMAT_LA_UINT32:
1205       *datatype = GL_UNSIGNED_INT;
1206       *comps = 2;
1207       return;
1208    case MESA_FORMAT_A_SINT8:
1209    case MESA_FORMAT_L_SINT8:
1210    case MESA_FORMAT_I_SINT8:
1211       *datatype = GL_BYTE;
1212       *comps = 1;
1213       return;
1214    case MESA_FORMAT_LA_SINT8:
1215       *datatype = GL_BYTE;
1216       *comps = 2;
1217       return;
1218
1219    case MESA_FORMAT_A_SINT16:
1220    case MESA_FORMAT_L_SINT16:
1221    case MESA_FORMAT_I_SINT16:
1222       *datatype = GL_SHORT;
1223       *comps = 1;
1224       return;
1225    case MESA_FORMAT_LA_SINT16:
1226       *datatype = GL_SHORT;
1227       *comps = 2;
1228       return;
1229
1230    case MESA_FORMAT_A_SINT32:
1231    case MESA_FORMAT_L_SINT32:
1232    case MESA_FORMAT_I_SINT32:
1233       *datatype = GL_INT;
1234       *comps = 1;
1235       return;
1236    case MESA_FORMAT_LA_SINT32:
1237       *datatype = GL_INT;
1238       *comps = 2;
1239       return;
1240
1241    case MESA_FORMAT_R_SINT8:
1242       *datatype = GL_BYTE;
1243       *comps = 1;
1244       return;
1245    case MESA_FORMAT_RG_SINT8:
1246       *datatype = GL_BYTE;
1247       *comps = 2;
1248       return;
1249    case MESA_FORMAT_RGB_SINT8:
1250       *datatype = GL_BYTE;
1251       *comps = 3;
1252       return;
1253    case MESA_FORMAT_RGBA_SINT8:
1254       *datatype = GL_BYTE;
1255       *comps = 4;
1256       return;
1257    case MESA_FORMAT_R_SINT16:
1258       *datatype = GL_SHORT;
1259       *comps = 1;
1260       return;
1261    case MESA_FORMAT_RG_SINT16:
1262       *datatype = GL_SHORT;
1263       *comps = 2;
1264       return;
1265    case MESA_FORMAT_RGB_SINT16:
1266       *datatype = GL_SHORT;
1267       *comps = 3;
1268       return;
1269    case MESA_FORMAT_RGBA_SINT16:
1270       *datatype = GL_SHORT;
1271       *comps = 4;
1272       return;
1273    case MESA_FORMAT_R_SINT32:
1274       *datatype = GL_INT;
1275       *comps = 1;
1276       return;
1277    case MESA_FORMAT_RG_SINT32:
1278       *datatype = GL_INT;
1279       *comps = 2;
1280       return;
1281    case MESA_FORMAT_RGB_SINT32:
1282       *datatype = GL_INT;
1283       *comps = 3;
1284       return;
1285    case MESA_FORMAT_RGBA_SINT32:
1286       *datatype = GL_INT;
1287       *comps = 4;
1288       return;
1289
1290    /**
1291     * \name Non-normalized unsigned integer formats.
1292     */
1293    case MESA_FORMAT_R_UINT8:
1294       *datatype = GL_UNSIGNED_BYTE;
1295       *comps = 1;
1296       return;
1297    case MESA_FORMAT_RG_UINT8:
1298       *datatype = GL_UNSIGNED_BYTE;
1299       *comps = 2;
1300       return;
1301    case MESA_FORMAT_RGB_UINT8:
1302       *datatype = GL_UNSIGNED_BYTE;
1303       *comps = 3;
1304       return;
1305    case MESA_FORMAT_R_UINT16:
1306       *datatype = GL_UNSIGNED_SHORT;
1307       *comps = 1;
1308       return;
1309    case MESA_FORMAT_RG_UINT16:
1310       *datatype = GL_UNSIGNED_SHORT;
1311       *comps = 2;
1312       return;
1313    case MESA_FORMAT_RGB_UINT16:
1314       *datatype = GL_UNSIGNED_SHORT;
1315       *comps = 3;
1316       return;
1317    case MESA_FORMAT_RGBA_UINT16:
1318       *datatype = GL_UNSIGNED_SHORT;
1319       *comps = 4;
1320       return;
1321    case MESA_FORMAT_R_UINT32:
1322       *datatype = GL_UNSIGNED_INT;
1323       *comps = 1;
1324       return;
1325    case MESA_FORMAT_RG_UINT32:
1326       *datatype = GL_UNSIGNED_INT;
1327       *comps = 2;
1328       return;
1329    case MESA_FORMAT_RGB_UINT32:
1330       *datatype = GL_UNSIGNED_INT;
1331       *comps = 3;
1332       return;
1333    case MESA_FORMAT_RGBA_UINT32:
1334       *datatype = GL_UNSIGNED_INT;
1335       *comps = 4;
1336       return;
1337
1338    case MESA_FORMAT_R9G9B9E5_FLOAT:
1339       *datatype = GL_UNSIGNED_INT_5_9_9_9_REV;
1340       *comps = 3;
1341       return;
1342
1343    case MESA_FORMAT_R11G11B10_FLOAT:
1344       *datatype = GL_UNSIGNED_INT_10F_11F_11F_REV;
1345       *comps = 3;
1346       return;
1347
1348    case MESA_FORMAT_B10G10R10A2_UINT:
1349    case MESA_FORMAT_R10G10B10A2_UINT:
1350       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1351       *comps = 4;
1352       return;
1353
1354    case MESA_FORMAT_R8G8B8X8_SRGB:
1355    case MESA_FORMAT_X8B8G8R8_SRGB:
1356    case MESA_FORMAT_RGBX_UINT8:
1357       *datatype = GL_UNSIGNED_BYTE;
1358       *comps = 4;
1359       return;
1360
1361    case MESA_FORMAT_R8G8B8X8_SNORM:
1362    case MESA_FORMAT_RGBX_SINT8:
1363       *datatype = GL_BYTE;
1364       *comps = 4;
1365       return;
1366
1367    case MESA_FORMAT_B10G10R10X2_UNORM:
1368    case MESA_FORMAT_R10G10B10X2_UNORM:
1369       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1370       *comps = 4;
1371       return;
1372
1373    case MESA_FORMAT_RGBX_UNORM16:
1374    case MESA_FORMAT_RGBX_UINT16:
1375       *datatype = GL_UNSIGNED_SHORT;
1376       *comps = 4;
1377       return;
1378
1379    case MESA_FORMAT_RGBX_SNORM16:
1380    case MESA_FORMAT_RGBX_SINT16:
1381       *datatype = GL_SHORT;
1382       *comps = 4;
1383       return;
1384
1385    case MESA_FORMAT_RGBX_FLOAT16:
1386       *datatype = GL_HALF_FLOAT;
1387       *comps = 4;
1388       return;
1389
1390    case MESA_FORMAT_RGBX_FLOAT32:
1391       *datatype = GL_FLOAT;
1392       *comps = 4;
1393       return;
1394
1395    case MESA_FORMAT_RGBX_UINT32:
1396       *datatype = GL_UNSIGNED_INT;
1397       *comps = 4;
1398       return;
1399
1400    case MESA_FORMAT_RGBX_SINT32:
1401       *datatype = GL_INT;
1402       *comps = 4;
1403       return;
1404
1405    case MESA_FORMAT_R10G10B10A2_UNORM:
1406       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1407       *comps = 4;
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       const char *name = _mesa_get_format_name(format);
1421       /* Warn if any formats are not handled */
1422       _mesa_problem(NULL, "bad format %s in _mesa_uncompressed_format_to_type_and_comps",
1423                     name ? name : "???");
1424       assert(format == MESA_FORMAT_NONE ||
1425              _mesa_is_format_compressed(format));
1426       *datatype = 0;
1427       *comps = 1;
1428    }
1429    }
1430 }
1431
1432 /**
1433  * Check if a mesa_format exactly matches a GL format/type combination
1434  * such that we can use memcpy() from one to the other.
1435  * \param mesa_format  a MESA_FORMAT_x value
1436  * \param format  the user-specified image format
1437  * \param type  the user-specified image datatype
1438  * \param swapBytes  typically the current pixel pack/unpack byteswap state
1439  * \param[out] error GL_NO_ERROR if format is an expected input.
1440  *                   GL_INVALID_ENUM if format is an unexpected input.
1441  * \return true if the formats match, false otherwise.
1442  */
1443 bool
1444 _mesa_format_matches_format_and_type(mesa_format mformat,
1445                                      GLenum format, GLenum type,
1446                                      bool swapBytes, GLenum *error)
1447 {
1448    if (error)
1449       *error = GL_NO_ERROR;
1450
1451    if (_mesa_is_format_compressed(mformat)) {
1452       if (error)
1453          *error = GL_INVALID_ENUM;
1454       return false;
1455    }
1456
1457    if (swapBytes && !_mesa_swap_bytes_in_type_enum(&type))
1458       return false;
1459
1460    /* format/type don't include srgb and should match regardless of it. */
1461    mformat = _mesa_get_srgb_format_linear(mformat);
1462
1463    /* intensity formats are uploaded with GL_RED, and we want to find
1464     * memcpy matches for them.
1465     */
1466    mformat = _mesa_get_intensity_format_red(mformat);
1467
1468    if (format == GL_COLOR_INDEX)
1469       return false;
1470
1471    mesa_format other_format = _mesa_format_from_format_and_type(format, type);
1472    if (_mesa_format_is_mesa_array_format(other_format))
1473       other_format = _mesa_format_from_array_format(other_format);
1474
1475    return other_format == mformat;
1476 }
1477