src/mesa/main/formats.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (c) 2008-2009  VMware, Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 #include "imports.h"
  28 #include "formats.h"
  29 #include "macros.h"
  30 #include "glformats.h"
  31
  32
  33 /**
  34  * Information about texture formats.
  35  */
  36 struct gl_format_info
  37 {
  38    mesa_format Name;
  39
  40    /** text name for debugging */
  41    const char *StrName;
  42
  43    enum mesa_format_layout Layout;
  44
  45    /**
  46     * Base format is one of GL_RED, GL_RG, GL_RGB, GL_RGBA, GL_ALPHA,
  47     * GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY, GL_YCBCR_MESA,
  48     * GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
  49     */
  50    GLenum BaseFormat;
  51
  52    /**
  53     * Logical data type: one of  GL_UNSIGNED_NORMALIZED, GL_SIGNED_NORMALIZED,
  54     * GL_UNSIGNED_INT, GL_INT, GL_FLOAT.
  55     */
  56    GLenum DataType;
  57
  58    GLubyte RedBits;
  59    GLubyte GreenBits;
  60    GLubyte BlueBits;
  61    GLubyte AlphaBits;
  62    GLubyte LuminanceBits;
  63    GLubyte IntensityBits;
  64    GLubyte DepthBits;
  65    GLubyte StencilBits;
  66
  67    /**
  68     * To describe compressed formats.  If not compressed, Width=Height=1.
  69     */
  70    GLubyte BlockWidth, BlockHeight;
  71    GLubyte BytesPerBlock;
  72
  73    uint8_t Swizzle[4];
  74    mesa_array_format ArrayFormat;
  75 };
  76
  77 #include "format_info.c"
  78
  79 static const struct gl_format_info *
  80 _mesa_get_format_info(mesa_format format)
  81 {
  82    const struct gl_format_info *info = &format_info[format];
  83    assert(info->Name == format);
  84    return info;
  85 }
  86
  87
  88 /** Return string name of format (for debugging) */
  89 const char *
  90 _mesa_get_format_name(mesa_format format)
  91 {
  92    const struct gl_format_info *info = _mesa_get_format_info(format);
  93    return info->StrName;
  94 }
  95
  96
  97
  98 /**
  99  * Return bytes needed to store a block of pixels in the given format.
 100  * Normally, a block is 1x1 (a single pixel).  But for compressed formats
 101  * a block may be 4x4 or 8x4, etc.
 102  *
 103  * Note: not GLuint, so as not to coerce math to unsigned. cf. fdo #37351
 104  */
 105 GLint
 106 _mesa_get_format_bytes(mesa_format format)
 107 {
 108    const struct gl_format_info *info = _mesa_get_format_info(format);
 109    ASSERT(info->BytesPerBlock);
 110    ASSERT(info->BytesPerBlock <= MAX_PIXEL_BYTES ||
 111           _mesa_is_format_compressed(format));
 112    return info->BytesPerBlock;
 113 }
 114
 115
 116 /**
 117  * Return bits per component for the given format.
 118  * \param format  one of MESA_FORMAT_x
 119  * \param pname  the component, such as GL_RED_BITS, GL_TEXTURE_BLUE_BITS, etc.
 120  */
 121 GLint
 122 _mesa_get_format_bits(mesa_format format, GLenum pname)
 123 {
 124    const struct gl_format_info *info = _mesa_get_format_info(format);
 125
 126    switch (pname) {
 127    case GL_RED_BITS:
 128    case GL_TEXTURE_RED_SIZE:
 129    case GL_RENDERBUFFER_RED_SIZE_EXT:
 130    case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
 131       return info->RedBits;
 132    case GL_GREEN_BITS:
 133    case GL_TEXTURE_GREEN_SIZE:
 134    case GL_RENDERBUFFER_GREEN_SIZE_EXT:
 135    case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
 136       return info->GreenBits;
 137    case GL_BLUE_BITS:
 138    case GL_TEXTURE_BLUE_SIZE:
 139    case GL_RENDERBUFFER_BLUE_SIZE_EXT:
 140    case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
 141       return info->BlueBits;
 142    case GL_ALPHA_BITS:
 143    case GL_TEXTURE_ALPHA_SIZE:
 144    case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
 145    case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
 146       return info->AlphaBits;
 147    case GL_TEXTURE_INTENSITY_SIZE:
 148       return info->IntensityBits;
 149    case GL_TEXTURE_LUMINANCE_SIZE:
 150       return info->LuminanceBits;
 151    case GL_INDEX_BITS:
 152       return 0;
 153    case GL_DEPTH_BITS:
 154    case GL_TEXTURE_DEPTH_SIZE_ARB:
 155    case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
 156    case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
 157       return info->DepthBits;
 158    case GL_STENCIL_BITS:
 159    case GL_TEXTURE_STENCIL_SIZE_EXT:
 160    case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
 161    case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
 162       return info->StencilBits;
 163    default:
 164       _mesa_problem(NULL, "bad pname in _mesa_get_format_bits()");
 165       return 0;
 166    }
 167 }
 168
 169
 170 GLuint
 171 _mesa_get_format_max_bits(mesa_format format)
 172 {
 173    const struct gl_format_info *info = _mesa_get_format_info(format);
 174    GLuint max = MAX2(info->RedBits, info->GreenBits);
 175    max = MAX2(max, info->BlueBits);
 176    max = MAX2(max, info->AlphaBits);
 177    max = MAX2(max, info->LuminanceBits);
 178    max = MAX2(max, info->IntensityBits);
 179    max = MAX2(max, info->DepthBits);
 180    max = MAX2(max, info->StencilBits);
 181    return max;
 182 }
 183
 184
 185 /**
 186  * Return the layout type of the given format.
 187  * The return value will be one of:
 188  *    MESA_FORMAT_LAYOUT_ARRAY
 189  *    MESA_FORMAT_LAYOUT_PACKED
 190  *    MESA_FORMAT_LAYOUT_OTHER
 191  */
 192 extern enum mesa_format_layout
 193 _mesa_get_format_layout(mesa_format format)
 194 {
 195    const struct gl_format_info *info = _mesa_get_format_info(format);
 196    return info->Layout;
 197 }
 198
 199
 200 /**
 201  * Return the data type (or more specifically, the data representation)
 202  * for the given format.
 203  * The return value will be one of:
 204  *    GL_UNSIGNED_NORMALIZED = unsigned int representing [0,1]
 205  *    GL_SIGNED_NORMALIZED = signed int representing [-1, 1]
 206  *    GL_UNSIGNED_INT = an ordinary unsigned integer
 207  *    GL_INT = an ordinary signed integer
 208  *    GL_FLOAT = an ordinary float
 209  */
 210 GLenum
 211 _mesa_get_format_datatype(mesa_format format)
 212 {
 213    const struct gl_format_info *info = _mesa_get_format_info(format);
 214    return info->DataType;
 215 }
 216
 217 static GLenum
 218 get_base_format_for_array_format(mesa_array_format format)
 219 {
 220    uint8_t swizzle[4];
 221    int num_channels;
 222
 223    _mesa_array_format_get_swizzle(format, swizzle);
 224    num_channels = _mesa_array_format_get_num_channels(format);
 225
 226    switch (num_channels) {
 227    case 4:
 228       /* FIXME: RGBX formats have 4 channels, but their base format is GL_RGB.
 229        * This is not really a problem for now because we only create array
 230        * formats from GL format/type combinations, and these cannot specify
 231        * RGBX formats.
 232        */
 233       return GL_RGBA;
 234    case 3:
 235       return GL_RGB;
 236    case 2:
 237       if (swizzle[0] == 0 &&
 238           swizzle[1] == 0 &&
 239           swizzle[2] == 0 &&
 240           swizzle[3] == 1)
 241          return GL_LUMINANCE_ALPHA;
 242       if (swizzle[0] == 1 &&
 243           swizzle[1] == 1 &&
 244           swizzle[2] == 1 &&
 245           swizzle[3] == 0)
 246          return GL_LUMINANCE_ALPHA;
 247       if (swizzle[0] == 0 &&
 248           swizzle[1] == 1 &&
 249           swizzle[2] == 4 &&
 250           swizzle[3] == 5)
 251          return GL_RG;
 252       if (swizzle[0] == 1 &&
 253           swizzle[1] == 0 &&
 254           swizzle[2] == 4 &&
 255           swizzle[3] == 5)
 256          return GL_RG;
 257       break;
 258    case 1:
 259       if (swizzle[0] == 0 &&
 260           swizzle[1] == 0 &&
 261           swizzle[2] == 0 &&
 262           swizzle[3] == 5)
 263          return GL_LUMINANCE;
 264       if (swizzle[0] == 0 &&
 265           swizzle[1] == 0 &&
 266           swizzle[2] == 0 &&
 267           swizzle[3] == 0)
 268          return GL_INTENSITY;
 269       if (swizzle[0] <= MESA_FORMAT_SWIZZLE_W)
 270          return GL_RED;
 271       if (swizzle[1] <= MESA_FORMAT_SWIZZLE_W)
 272          return GL_GREEN;
 273       if (swizzle[2] <= MESA_FORMAT_SWIZZLE_W)
 274          return GL_BLUE;
 275       if (swizzle[3] <= MESA_FORMAT_SWIZZLE_W)
 276          return GL_ALPHA;
 277       break;
 278    }
 279
 280    unreachable("Unsupported format");
 281 }
 282
 283 /**
 284  * Return the basic format for the given type.  The result will be one of
 285  * GL_RGB, GL_RGBA, GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY,
 286  * GL_YCBCR_MESA, GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
 287  * This functions accepts a mesa_format or a mesa_array_format.
 288  */
 289 GLenum
 290 _mesa_get_format_base_format(uint32_t format)
 291 {
 292    if (!_mesa_format_is_mesa_array_format(format)) {
 293       const struct gl_format_info *info = _mesa_get_format_info(format);
 294       return info->BaseFormat;
 295    } else {
 296       return get_base_format_for_array_format(format);
 297    }
 298 }
 299
 300
 301 /**
 302  * Return the block size (in pixels) for the given format.  Normally
 303  * the block size is 1x1.  But compressed formats will have block sizes
 304  * of 4x4 or 8x4 pixels, etc.
 305  * \param bw  returns block width in pixels
 306  * \param bh  returns block height in pixels
 307  */
 308 void
 309 _mesa_get_format_block_size(mesa_format format, GLuint *bw, GLuint *bh)
 310 {
 311    const struct gl_format_info *info = _mesa_get_format_info(format);
 312    *bw = info->BlockWidth;
 313    *bh = info->BlockHeight;
 314 }
 315
 316
 317 /**
 318  * Returns the an array of four numbers representing the transformation
 319  * from the RGBA or SZ colorspace to the given format.  For array formats,
 320  * the i'th RGBA component is given by:
 321  *
 322  * if (swizzle[i] <= MESA_FORMAT_SWIZZLE_W)
 323  *    comp = data[swizzle[i]];
 324  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ZERO)
 325  *    comp = 0;
 326  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ONE)
 327  *    comp = 1;
 328  * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_NONE)
 329  *    // data does not contain a channel of this format
 330  *
 331  * For packed formats, the swizzle gives the number of components left of
 332  * the least significant bit.
 333  *
 334  * Compressed formats have no swizzle.
 335  */
 336 void
 337 _mesa_get_format_swizzle(mesa_format format, uint8_t swizzle_out[4])
 338 {
 339    const struct gl_format_info *info = _mesa_get_format_info(format);
 340    memcpy(swizzle_out, info->Swizzle, sizeof(info->Swizzle));
 341 }
 342
 343 mesa_array_format
 344 _mesa_array_format_flip_channels(mesa_array_format format)
 345 {
 346    int num_channels;
 347    uint8_t swizzle[4];
 348
 349    num_channels = _mesa_array_format_get_num_channels(format);
 350    _mesa_array_format_get_swizzle(format, swizzle);
 351
 352    if (num_channels == 1)
 353       return format;
 354
 355    if (num_channels == 2) {
 356       _mesa_array_format_set_swizzle(&format, swizzle[1], swizzle[0],
 357                                      swizzle[2], swizzle[3]);
 358       return format;
 359    }
 360
 361    if (num_channels == 4) {
 362       _mesa_array_format_set_swizzle(&format, swizzle[3], swizzle[2],
 363                                      swizzle[1], swizzle[0]);
 364       return format;
 365    }
 366
 367    unreachable("Invalid array format");
 368 }
 369
 370 uint32_t
 371 _mesa_format_to_array_format(mesa_format format)
 372 {
 373    const struct gl_format_info *info = _mesa_get_format_info(format);
 374    if (_mesa_little_endian())
 375       return info->ArrayFormat;
 376    else
 377       return _mesa_array_format_flip_channels(info->ArrayFormat);
 378 }
 379
 380 mesa_format
 381 _mesa_format_from_array_format(uint32_t array_format)
 382 {
 383    mesa_array_format af;
 384    unsigned f;
 385
 386    assert(_mesa_format_is_mesa_array_format(array_format));
 387
 388    if (_mesa_little_endian())
 389       af = array_format;
 390    else
 391       af = _mesa_array_format_flip_channels(array_format);
 392
 393    for (f = 1; f < MESA_FORMAT_COUNT; ++f)
 394       if (_mesa_get_format_info(f)->ArrayFormat == af)
 395          return f;
 396
 397    return MESA_FORMAT_NONE;
 398 }
 399
 400 /** Is the given format a compressed format? */
 401 GLboolean
 402 _mesa_is_format_compressed(mesa_format format)
 403 {
 404    const struct gl_format_info *info = _mesa_get_format_info(format);
 405    return info->BlockWidth > 1 || info->BlockHeight > 1;
 406 }
 407
 408
 409 /**
 410  * Determine if the given format represents a packed depth/stencil buffer.
 411  */
 412 GLboolean
 413 _mesa_is_format_packed_depth_stencil(mesa_format format)
 414 {
 415    const struct gl_format_info *info = _mesa_get_format_info(format);
 416
 417    return info->BaseFormat == GL_DEPTH_STENCIL;
 418 }
 419
 420
 421 /**
 422  * Is the given format a signed/unsigned integer color format?
 423  */
 424 GLboolean
 425 _mesa_is_format_integer_color(mesa_format format)
 426 {
 427    const struct gl_format_info *info = _mesa_get_format_info(format);
 428    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT) &&
 429       info->BaseFormat != GL_DEPTH_COMPONENT &&
 430       info->BaseFormat != GL_DEPTH_STENCIL &&
 431       info->BaseFormat != GL_STENCIL_INDEX;
 432 }
 433
 434
 435 /**
 436  * Is the given format an unsigned integer format?
 437  */
 438 GLboolean
 439 _mesa_is_format_unsigned(mesa_format format)
 440 {
 441    const struct gl_format_info *info = _mesa_get_format_info(format);
 442    return _mesa_is_type_unsigned(info->DataType);
 443 }
 444
 445
 446 /**
 447  * Does the given format store signed values?
 448  */
 449 GLboolean
 450 _mesa_is_format_signed(mesa_format format)
 451 {
 452    if (format == MESA_FORMAT_R11G11B10_FLOAT ||
 453        format == MESA_FORMAT_R9G9B9E5_FLOAT) {
 454       /* these packed float formats only store unsigned values */
 455       return GL_FALSE;
 456    }
 457    else {
 458       const struct gl_format_info *info = _mesa_get_format_info(format);
 459       return (info->DataType == GL_SIGNED_NORMALIZED ||
 460               info->DataType == GL_INT ||
 461               info->DataType == GL_FLOAT);
 462    }
 463 }
 464
 465 /**
 466  * Is the given format an integer format?
 467  */
 468 GLboolean
 469 _mesa_is_format_integer(mesa_format format)
 470 {
 471    const struct gl_format_info *info = _mesa_get_format_info(format);
 472    return (info->DataType == GL_INT || info->DataType == GL_UNSIGNED_INT);
 473 }
 474
 475
 476 /**
 477  * Return true if the given format is a color format.
 478  */
 479 GLenum
 480 _mesa_is_format_color_format(mesa_format format)
 481 {
 482    const struct gl_format_info *info = _mesa_get_format_info(format);
 483    switch (info->BaseFormat) {
 484    case GL_DEPTH_COMPONENT:
 485    case GL_STENCIL_INDEX:
 486    case GL_DEPTH_STENCIL:
 487       return false;
 488    default:
 489       return true;
 490    }
 491 }
 492
 493
 494 /**
 495  * Return color encoding for given format.
 496  * \return GL_LINEAR or GL_SRGB
 497  */
 498 GLenum
 499 _mesa_get_format_color_encoding(mesa_format format)
 500 {
 501    /* XXX this info should be encoded in gl_format_info */
 502    switch (format) {
 503    case MESA_FORMAT_BGR_SRGB8:
 504    case MESA_FORMAT_A8B8G8R8_SRGB:
 505    case MESA_FORMAT_B8G8R8A8_SRGB:
 506    case MESA_FORMAT_A8R8G8B8_SRGB:
 507    case MESA_FORMAT_R8G8B8A8_SRGB:
 508    case MESA_FORMAT_L_SRGB8:
 509    case MESA_FORMAT_L8A8_SRGB:
 510    case MESA_FORMAT_A8L8_SRGB:
 511    case MESA_FORMAT_SRGB_DXT1:
 512    case MESA_FORMAT_SRGBA_DXT1:
 513    case MESA_FORMAT_SRGBA_DXT3:
 514    case MESA_FORMAT_SRGBA_DXT5:
 515    case MESA_FORMAT_R8G8B8X8_SRGB:
 516    case MESA_FORMAT_ETC2_SRGB8:
 517    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 518    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 519    case MESA_FORMAT_B8G8R8X8_SRGB:
 520    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 521       return GL_SRGB;
 522    default:
 523       return GL_LINEAR;
 524    }
 525 }
 526
 527
 528 /**
 529  * Return TRUE if format is an ETC2 compressed format specified
 530  * by GL_ARB_ES3_compatibility.
 531  */
 532 bool
 533 _mesa_is_format_etc2(mesa_format format)
 534 {
 535    switch (format) {
 536    case MESA_FORMAT_ETC2_RGB8:
 537    case MESA_FORMAT_ETC2_SRGB8:
 538    case MESA_FORMAT_ETC2_RGBA8_EAC:
 539    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 540    case MESA_FORMAT_ETC2_R11_EAC:
 541    case MESA_FORMAT_ETC2_RG11_EAC:
 542    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 543    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 544    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 545    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 546       return GL_TRUE;
 547    default:
 548       return GL_FALSE;
 549    }
 550 }
 551
 552
 553 /**
 554  * For an sRGB format, return the corresponding linear color space format.
 555  * For non-sRGB formats, return the format as-is.
 556  */
 557 mesa_format
 558 _mesa_get_srgb_format_linear(mesa_format format)
 559 {
 560    switch (format) {
 561    case MESA_FORMAT_BGR_SRGB8:
 562       format = MESA_FORMAT_BGR_UNORM8;
 563       break;
 564    case MESA_FORMAT_A8B8G8R8_SRGB:
 565       format = MESA_FORMAT_A8B8G8R8_UNORM;
 566       break;
 567    case MESA_FORMAT_B8G8R8A8_SRGB:
 568       format = MESA_FORMAT_B8G8R8A8_UNORM;
 569       break;
 570    case MESA_FORMAT_A8R8G8B8_SRGB:
 571       format = MESA_FORMAT_A8R8G8B8_UNORM;
 572       break;
 573    case MESA_FORMAT_R8G8B8A8_SRGB:
 574       format = MESA_FORMAT_R8G8B8A8_UNORM;
 575       break;
 576    case MESA_FORMAT_L_SRGB8:
 577       format = MESA_FORMAT_L_UNORM8;
 578       break;
 579    case MESA_FORMAT_L8A8_SRGB:
 580       format = MESA_FORMAT_L8A8_UNORM;
 581       break;
 582    case MESA_FORMAT_A8L8_SRGB:
 583       format = MESA_FORMAT_A8L8_UNORM;
 584       break;
 585    case MESA_FORMAT_SRGB_DXT1:
 586       format = MESA_FORMAT_RGB_DXT1;
 587       break;
 588    case MESA_FORMAT_SRGBA_DXT1:
 589       format = MESA_FORMAT_RGBA_DXT1;
 590       break;
 591    case MESA_FORMAT_SRGBA_DXT3:
 592       format = MESA_FORMAT_RGBA_DXT3;
 593       break;
 594    case MESA_FORMAT_SRGBA_DXT5:
 595       format = MESA_FORMAT_RGBA_DXT5;
 596       break;
 597    case MESA_FORMAT_R8G8B8X8_SRGB:
 598       format = MESA_FORMAT_R8G8B8X8_UNORM;
 599       break;
 600    case MESA_FORMAT_X8B8G8R8_SRGB:
 601       format = MESA_FORMAT_X8B8G8R8_UNORM;
 602       break;
 603    case MESA_FORMAT_ETC2_SRGB8:
 604       format = MESA_FORMAT_ETC2_RGB8;
 605       break;
 606    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 607       format = MESA_FORMAT_ETC2_RGBA8_EAC;
 608       break;
 609    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 610       format = MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1;
 611       break;
 612    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 613       format = MESA_FORMAT_BPTC_RGBA_UNORM;
 614       break;
 615    case MESA_FORMAT_B8G8R8X8_SRGB:
 616       format = MESA_FORMAT_B8G8R8X8_UNORM;
 617       break;
 618    case MESA_FORMAT_X8R8G8B8_SRGB:
 619       format = MESA_FORMAT_X8R8G8B8_UNORM;
 620       break;
 621    default:
 622       break;
 623    }
 624    return format;
 625 }
 626
 627
 628 /**
 629  * If the given format is a compressed format, return a corresponding
 630  * uncompressed format.
 631  */
 632 mesa_format
 633 _mesa_get_uncompressed_format(mesa_format format)
 634 {
 635    switch (format) {
 636    case MESA_FORMAT_RGB_FXT1:
 637       return MESA_FORMAT_BGR_UNORM8;
 638    case MESA_FORMAT_RGBA_FXT1:
 639       return MESA_FORMAT_A8B8G8R8_UNORM;
 640    case MESA_FORMAT_RGB_DXT1:
 641    case MESA_FORMAT_SRGB_DXT1:
 642       return MESA_FORMAT_BGR_UNORM8;
 643    case MESA_FORMAT_RGBA_DXT1:
 644    case MESA_FORMAT_SRGBA_DXT1:
 645       return MESA_FORMAT_A8B8G8R8_UNORM;
 646    case MESA_FORMAT_RGBA_DXT3:
 647    case MESA_FORMAT_SRGBA_DXT3:
 648       return MESA_FORMAT_A8B8G8R8_UNORM;
 649    case MESA_FORMAT_RGBA_DXT5:
 650    case MESA_FORMAT_SRGBA_DXT5:
 651       return MESA_FORMAT_A8B8G8R8_UNORM;
 652    case MESA_FORMAT_R_RGTC1_UNORM:
 653       return MESA_FORMAT_R_UNORM8;
 654    case MESA_FORMAT_R_RGTC1_SNORM:
 655       return MESA_FORMAT_R_SNORM8;
 656    case MESA_FORMAT_RG_RGTC2_UNORM:
 657       return MESA_FORMAT_R8G8_UNORM;
 658    case MESA_FORMAT_RG_RGTC2_SNORM:
 659       return MESA_FORMAT_R8G8_SNORM;
 660    case MESA_FORMAT_L_LATC1_UNORM:
 661       return MESA_FORMAT_L_UNORM8;
 662    case MESA_FORMAT_L_LATC1_SNORM:
 663       return MESA_FORMAT_L_SNORM8;
 664    case MESA_FORMAT_LA_LATC2_UNORM:
 665       return MESA_FORMAT_L8A8_UNORM;
 666    case MESA_FORMAT_LA_LATC2_SNORM:
 667       return MESA_FORMAT_L8A8_SNORM;
 668    case MESA_FORMAT_ETC1_RGB8:
 669    case MESA_FORMAT_ETC2_RGB8:
 670    case MESA_FORMAT_ETC2_SRGB8:
 671       return MESA_FORMAT_BGR_UNORM8;
 672    case MESA_FORMAT_ETC2_RGBA8_EAC:
 673    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
 674    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
 675    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
 676       return MESA_FORMAT_A8B8G8R8_UNORM;
 677    case MESA_FORMAT_ETC2_R11_EAC:
 678    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
 679       return MESA_FORMAT_R_UNORM16;
 680    case MESA_FORMAT_ETC2_RG11_EAC:
 681    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
 682       return MESA_FORMAT_R16G16_UNORM;
 683    case MESA_FORMAT_BPTC_RGBA_UNORM:
 684    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
 685       return MESA_FORMAT_A8B8G8R8_UNORM;
 686    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
 687    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
 688       return MESA_FORMAT_RGB_FLOAT32;
 689    default:
 690 #ifdef DEBUG
 691       assert(!_mesa_is_format_compressed(format));
 692 #endif
 693       return format;
 694    }
 695 }
 696
 697
 698 GLuint
 699 _mesa_format_num_components(mesa_format format)
 700 {
 701    const struct gl_format_info *info = _mesa_get_format_info(format);
 702    return ((info->RedBits > 0) +
 703            (info->GreenBits > 0) +
 704            (info->BlueBits > 0) +
 705            (info->AlphaBits > 0) +
 706            (info->LuminanceBits > 0) +
 707            (info->IntensityBits > 0) +
 708            (info->DepthBits > 0) +
 709            (info->StencilBits > 0));
 710 }
 711
 712
 713 /**
 714  * Returns true if a color format has data stored in the R/G/B/A channels,
 715  * given an index from 0 to 3.
 716  */
 717 bool
 718 _mesa_format_has_color_component(mesa_format format, int component)
 719 {
 720    const struct gl_format_info *info = _mesa_get_format_info(format);
 721
 722    assert(info->BaseFormat != GL_DEPTH_COMPONENT &&
 723           info->BaseFormat != GL_DEPTH_STENCIL &&
 724           info->BaseFormat != GL_STENCIL_INDEX);
 725
 726    switch (component) {
 727    case 0:
 728       return (info->RedBits + info->IntensityBits + info->LuminanceBits) > 0;
 729    case 1:
 730       return (info->GreenBits + info->IntensityBits + info->LuminanceBits) > 0;
 731    case 2:
 732       return (info->BlueBits + info->IntensityBits + info->LuminanceBits) > 0;
 733    case 3:
 734       return (info->AlphaBits + info->IntensityBits) > 0;
 735    default:
 736       assert(!"Invalid color component: must be 0..3");
 737       return false;
 738    }
 739 }
 740
 741
 742 /**
 743  * Return number of bytes needed to store an image of the given size
 744  * in the given format.
 745  */
 746 GLuint
 747 _mesa_format_image_size(mesa_format format, GLsizei width,
 748                         GLsizei height, GLsizei depth)
 749 {
 750    const struct gl_format_info *info = _mesa_get_format_info(format);
 751    /* Strictly speaking, a conditional isn't needed here */
 752    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 753       /* compressed format (2D only for now) */
 754       const GLuint bw = info->BlockWidth, bh = info->BlockHeight;
 755       const GLuint wblocks = (width + bw - 1) / bw;
 756       const GLuint hblocks = (height + bh - 1) / bh;
 757       const GLuint sz = wblocks * hblocks * info->BytesPerBlock;
 758       return sz * depth;
 759    }
 760    else {
 761       /* non-compressed */
 762       const GLuint sz = width * height * depth * info->BytesPerBlock;
 763       return sz;
 764    }
 765 }
 766
 767
 768 /**
 769  * Same as _mesa_format_image_size() but returns a 64-bit value to
 770  * accomodate very large textures.
 771  */
 772 uint64_t
 773 _mesa_format_image_size64(mesa_format format, GLsizei width,
 774                           GLsizei height, GLsizei depth)
 775 {
 776    const struct gl_format_info *info = _mesa_get_format_info(format);
 777    /* Strictly speaking, a conditional isn't needed here */
 778    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 779       /* compressed format (2D only for now) */
 780       const uint64_t bw = info->BlockWidth, bh = info->BlockHeight;
 781       const uint64_t wblocks = (width + bw - 1) / bw;
 782       const uint64_t hblocks = (height + bh - 1) / bh;
 783       const uint64_t sz = wblocks * hblocks * info->BytesPerBlock;
 784       return sz * depth;
 785    }
 786    else {
 787       /* non-compressed */
 788       const uint64_t sz = ((uint64_t) width *
 789                            (uint64_t) height *
 790                            (uint64_t) depth *
 791                            info->BytesPerBlock);
 792       return sz;
 793    }
 794 }
 795
 796
 797
 798 GLint
 799 _mesa_format_row_stride(mesa_format format, GLsizei width)
 800 {
 801    const struct gl_format_info *info = _mesa_get_format_info(format);
 802    /* Strictly speaking, a conditional isn't needed here */
 803    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
 804       /* compressed format */
 805       const GLuint bw = info->BlockWidth;
 806       const GLuint wblocks = (width + bw - 1) / bw;
 807       const GLint stride = wblocks * info->BytesPerBlock;
 808       return stride;
 809    }
 810    else {
 811       const GLint stride = width * info->BytesPerBlock;
 812       return stride;
 813    }
 814 }
 815
 816
 817 /**
 818  * Debug/test: check that all formats are handled in the
 819  * _mesa_format_to_type_and_comps() function.  When new pixel formats
 820  * are added to Mesa, that function needs to be updated.
 821  * This is a no-op after the first call.
 822  */
 823 static void
 824 check_format_to_type_and_comps(void)
 825 {
 826    mesa_format f;
 827
 828    for (f = MESA_FORMAT_NONE + 1; f < MESA_FORMAT_COUNT; f++) {
 829       GLenum datatype = 0;
 830       GLuint comps = 0;
 831       /* This function will emit a problem/warning if the format is
 832        * not handled.
 833        */
 834       _mesa_format_to_type_and_comps(f, &datatype, &comps);
 835    }
 836 }
 837
 838 /**
 839  * Do sanity checking of the format info table.
 840  */
 841 void
 842 _mesa_test_formats(void)
 843 {
 844    GLuint i;
 845
 846    STATIC_ASSERT(Elements(format_info) == MESA_FORMAT_COUNT);
 847
 848    for (i = 0; i < MESA_FORMAT_COUNT; i++) {
 849       const struct gl_format_info *info = _mesa_get_format_info(i);
 850       assert(info);
 851
 852       assert(info->Name == i);
 853
 854       if (info->Name == MESA_FORMAT_NONE)
 855          continue;
 856
 857       if (info->BlockWidth == 1 && info->BlockHeight == 1) {
 858          if (info->RedBits > 0) {
 859             GLuint t = info->RedBits + info->GreenBits
 860                + info->BlueBits + info->AlphaBits;
 861             assert(t / 8 <= info->BytesPerBlock);
 862             (void) t;
 863          }
 864       }
 865
 866       assert(info->DataType == GL_UNSIGNED_NORMALIZED ||
 867              info->DataType == GL_SIGNED_NORMALIZED ||
 868              info->DataType == GL_UNSIGNED_INT ||
 869              info->DataType == GL_INT ||
 870              info->DataType == GL_FLOAT ||
 871              /* Z32_FLOAT_X24S8 has DataType of GL_NONE */
 872              info->DataType == GL_NONE);
 873
 874       if (info->BaseFormat == GL_RGB) {
 875          assert(info->RedBits > 0);
 876          assert(info->GreenBits > 0);
 877          assert(info->BlueBits > 0);
 878          assert(info->AlphaBits == 0);
 879          assert(info->LuminanceBits == 0);
 880          assert(info->IntensityBits == 0);
 881       }
 882       else if (info->BaseFormat == GL_RGBA) {
 883          assert(info->RedBits > 0);
 884          assert(info->GreenBits > 0);
 885          assert(info->BlueBits > 0);
 886          assert(info->AlphaBits > 0);
 887          assert(info->LuminanceBits == 0);
 888          assert(info->IntensityBits == 0);
 889       }
 890       else if (info->BaseFormat == GL_RG) {
 891          assert(info->RedBits > 0);
 892          assert(info->GreenBits > 0);
 893          assert(info->BlueBits == 0);
 894          assert(info->AlphaBits == 0);
 895          assert(info->LuminanceBits == 0);
 896          assert(info->IntensityBits == 0);
 897       }
 898       else if (info->BaseFormat == GL_RED) {
 899          assert(info->RedBits > 0);
 900          assert(info->GreenBits == 0);
 901          assert(info->BlueBits == 0);
 902          assert(info->AlphaBits == 0);
 903          assert(info->LuminanceBits == 0);
 904          assert(info->IntensityBits == 0);
 905       }
 906       else if (info->BaseFormat == GL_LUMINANCE) {
 907          assert(info->RedBits == 0);
 908          assert(info->GreenBits == 0);
 909          assert(info->BlueBits == 0);
 910          assert(info->AlphaBits == 0);
 911          assert(info->LuminanceBits > 0);
 912          assert(info->IntensityBits == 0);
 913       }
 914       else if (info->BaseFormat == GL_INTENSITY) {
 915          assert(info->RedBits == 0);
 916          assert(info->GreenBits == 0);
 917          assert(info->BlueBits == 0);
 918          assert(info->AlphaBits == 0);
 919          assert(info->LuminanceBits == 0);
 920          assert(info->IntensityBits > 0);
 921       }
 922    }
 923
 924    check_format_to_type_and_comps();
 925 }
 926
 927
 928
 929 /**
 930  * Return datatype and number of components per texel for the given mesa_format.
 931  * Only used for mipmap generation code.
 932  */
 933 void
 934 _mesa_format_to_type_and_comps(mesa_format format,
 935                                GLenum *datatype, GLuint *comps)
 936 {
 937    switch (format) {
 938    case MESA_FORMAT_A8B8G8R8_UNORM:
 939    case MESA_FORMAT_R8G8B8A8_UNORM:
 940    case MESA_FORMAT_B8G8R8A8_UNORM:
 941    case MESA_FORMAT_A8R8G8B8_UNORM:
 942    case MESA_FORMAT_X8B8G8R8_UNORM:
 943    case MESA_FORMAT_R8G8B8X8_UNORM:
 944    case MESA_FORMAT_B8G8R8X8_UNORM:
 945    case MESA_FORMAT_X8R8G8B8_UNORM:
 946       *datatype = GL_UNSIGNED_BYTE;
 947       *comps = 4;
 948       return;
 949    case MESA_FORMAT_BGR_UNORM8:
 950    case MESA_FORMAT_RGB_UNORM8:
 951       *datatype = GL_UNSIGNED_BYTE;
 952       *comps = 3;
 953       return;
 954    case MESA_FORMAT_B5G6R5_UNORM:
 955    case MESA_FORMAT_R5G6B5_UNORM:
 956       *datatype = GL_UNSIGNED_SHORT_5_6_5;
 957       *comps = 3;
 958       return;
 959
 960    case MESA_FORMAT_B4G4R4A4_UNORM:
 961    case MESA_FORMAT_A4R4G4B4_UNORM:
 962    case MESA_FORMAT_B4G4R4X4_UNORM:
 963       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
 964       *comps = 4;
 965       return;
 966
 967    case MESA_FORMAT_B5G5R5A1_UNORM:
 968    case MESA_FORMAT_A1R5G5B5_UNORM:
 969    case MESA_FORMAT_B5G5R5X1_UNORM:
 970       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 971       *comps = 4;
 972       return;
 973
 974    case MESA_FORMAT_B10G10R10A2_UNORM:
 975       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
 976       *comps = 4;
 977       return;
 978
 979    case MESA_FORMAT_A1B5G5R5_UNORM:
 980       *datatype = GL_UNSIGNED_SHORT_5_5_5_1;
 981       *comps = 4;
 982       return;
 983
 984    case MESA_FORMAT_L4A4_UNORM:
 985       *datatype = MESA_UNSIGNED_BYTE_4_4;
 986       *comps = 2;
 987       return;
 988
 989    case MESA_FORMAT_L8A8_UNORM:
 990    case MESA_FORMAT_A8L8_UNORM:
 991    case MESA_FORMAT_R8G8_UNORM:
 992    case MESA_FORMAT_G8R8_UNORM:
 993       *datatype = GL_UNSIGNED_BYTE;
 994       *comps = 2;
 995       return;
 996
 997    case MESA_FORMAT_L16A16_UNORM:
 998    case MESA_FORMAT_A16L16_UNORM:
 999    case MESA_FORMAT_R16G16_UNORM:
1000    case MESA_FORMAT_G16R16_UNORM:
1001       *datatype = GL_UNSIGNED_SHORT;
1002       *comps = 2;
1003       return;
1004
1005    case MESA_FORMAT_R_UNORM16:
1006    case MESA_FORMAT_A_UNORM16:
1007    case MESA_FORMAT_L_UNORM16:
1008    case MESA_FORMAT_I_UNORM16:
1009       *datatype = GL_UNSIGNED_SHORT;
1010       *comps = 1;
1011       return;
1012
1013    case MESA_FORMAT_R3G3B2_UNORM:
1014       *datatype = GL_UNSIGNED_BYTE_2_3_3_REV;
1015       *comps = 3;
1016       return;
1017    case MESA_FORMAT_A4B4G4R4_UNORM:
1018       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
1019       *comps = 4;
1020       return;
1021
1022    case MESA_FORMAT_R4G4B4A4_UNORM:
1023       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
1024       *comps = 4;
1025       return;
1026    case MESA_FORMAT_R1G5B5A5_UNORM:
1027       *datatype = GL_UNSIGNED_SHORT_5_5_5_1;
1028       *comps = 4;
1029       return;
1030    case MESA_FORMAT_R5G5B5A1_UNORM:
1031       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
1032       *comps = 4;
1033       return;
1034    case MESA_FORMAT_A5B5G5R1_UNORM:
1035       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
1036       *comps = 4;
1037       return;
1038    case MESA_FORMAT_A2B10G10R10_UNORM:
1039    case MESA_FORMAT_A2B10G10R10_UINT:
1040       *datatype = GL_UNSIGNED_INT_10_10_10_2;
1041       *comps = 4;
1042       return;
1043    case MESA_FORMAT_A2R10G10B10_UNORM:
1044    case MESA_FORMAT_A2R10G10B10_UINT:
1045       *datatype = GL_UNSIGNED_INT_10_10_10_2;
1046       *comps = 4;
1047       return;
1048    case MESA_FORMAT_R2G10B10A10_UNORM:
1049       *datatype = GL_UNSIGNED_INT_10_10_10_2;
1050       *comps = 4;
1051       return;
1052    case MESA_FORMAT_A10B10G10R2_UNORM:
1053       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1054       *comps = 4;
1055       return;
1056
1057    case MESA_FORMAT_B2G3R3_UNORM:
1058       *datatype = GL_UNSIGNED_BYTE_3_3_2;
1059       *comps = 3;
1060       return;
1061
1062    case MESA_FORMAT_A_UNORM8:
1063    case MESA_FORMAT_L_UNORM8:
1064    case MESA_FORMAT_I_UNORM8:
1065    case MESA_FORMAT_R_UNORM8:
1066    case MESA_FORMAT_S_UINT8:
1067       *datatype = GL_UNSIGNED_BYTE;
1068       *comps = 1;
1069       return;
1070
1071    case MESA_FORMAT_YCBCR:
1072    case MESA_FORMAT_YCBCR_REV:
1073       *datatype = GL_UNSIGNED_SHORT;
1074       *comps = 2;
1075       return;
1076
1077    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1078       *datatype = GL_UNSIGNED_INT_24_8_MESA;
1079       *comps = 2;
1080       return;
1081
1082    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1083       *datatype = GL_UNSIGNED_INT_8_24_REV_MESA;
1084       *comps = 2;
1085       return;
1086
1087    case MESA_FORMAT_Z_UNORM16:
1088       *datatype = GL_UNSIGNED_SHORT;
1089       *comps = 1;
1090       return;
1091
1092    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1093       *datatype = GL_UNSIGNED_INT;
1094       *comps = 1;
1095       return;
1096
1097    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1098       *datatype = GL_UNSIGNED_INT;
1099       *comps = 1;
1100       return;
1101
1102    case MESA_FORMAT_Z_UNORM32:
1103       *datatype = GL_UNSIGNED_INT;
1104       *comps = 1;
1105       return;
1106
1107    case MESA_FORMAT_Z_FLOAT32:
1108       *datatype = GL_FLOAT;
1109       *comps = 1;
1110       return;
1111
1112    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
1113       *datatype = GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
1114       *comps = 1;
1115       return;
1116
1117    case MESA_FORMAT_R_SNORM8:
1118    case MESA_FORMAT_A_SNORM8:
1119    case MESA_FORMAT_L_SNORM8:
1120    case MESA_FORMAT_I_SNORM8:
1121       *datatype = GL_BYTE;
1122       *comps = 1;
1123       return;
1124    case MESA_FORMAT_R8G8_SNORM:
1125    case MESA_FORMAT_L8A8_SNORM:
1126    case MESA_FORMAT_A8L8_SNORM:
1127       *datatype = GL_BYTE;
1128       *comps = 2;
1129       return;
1130    case MESA_FORMAT_A8B8G8R8_SNORM:
1131    case MESA_FORMAT_R8G8B8A8_SNORM:
1132    case MESA_FORMAT_X8B8G8R8_SNORM:
1133       *datatype = GL_BYTE;
1134       *comps = 4;
1135       return;
1136
1137    case MESA_FORMAT_RGBA_UNORM16:
1138       *datatype = GL_UNSIGNED_SHORT;
1139       *comps = 4;
1140       return;
1141
1142    case MESA_FORMAT_R_SNORM16:
1143    case MESA_FORMAT_A_SNORM16:
1144    case MESA_FORMAT_L_SNORM16:
1145    case MESA_FORMAT_I_SNORM16:
1146       *datatype = GL_SHORT;
1147       *comps = 1;
1148       return;
1149    case MESA_FORMAT_R16G16_SNORM:
1150    case MESA_FORMAT_LA_SNORM16:
1151       *datatype = GL_SHORT;
1152       *comps = 2;
1153       return;
1154    case MESA_FORMAT_RGB_SNORM16:
1155       *datatype = GL_SHORT;
1156       *comps = 3;
1157       return;
1158    case MESA_FORMAT_RGBA_SNORM16:
1159       *datatype = GL_SHORT;
1160       *comps = 4;
1161       return;
1162
1163    case MESA_FORMAT_BGR_SRGB8:
1164       *datatype = GL_UNSIGNED_BYTE;
1165       *comps = 3;
1166       return;
1167    case MESA_FORMAT_A8B8G8R8_SRGB:
1168    case MESA_FORMAT_B8G8R8A8_SRGB:
1169    case MESA_FORMAT_A8R8G8B8_SRGB:
1170    case MESA_FORMAT_R8G8B8A8_SRGB:
1171       *datatype = GL_UNSIGNED_BYTE;
1172       *comps = 4;
1173       return;
1174    case MESA_FORMAT_L_SRGB8:
1175       *datatype = GL_UNSIGNED_BYTE;
1176       *comps = 1;
1177       return;
1178    case MESA_FORMAT_L8A8_SRGB:
1179    case MESA_FORMAT_A8L8_SRGB:
1180       *datatype = GL_UNSIGNED_BYTE;
1181       *comps = 2;
1182       return;
1183
1184    case MESA_FORMAT_RGB_FXT1:
1185    case MESA_FORMAT_RGBA_FXT1:
1186    case MESA_FORMAT_RGB_DXT1:
1187    case MESA_FORMAT_RGBA_DXT1:
1188    case MESA_FORMAT_RGBA_DXT3:
1189    case MESA_FORMAT_RGBA_DXT5:
1190    case MESA_FORMAT_SRGB_DXT1:
1191    case MESA_FORMAT_SRGBA_DXT1:
1192    case MESA_FORMAT_SRGBA_DXT3:
1193    case MESA_FORMAT_SRGBA_DXT5:
1194    case MESA_FORMAT_R_RGTC1_UNORM:
1195    case MESA_FORMAT_R_RGTC1_SNORM:
1196    case MESA_FORMAT_RG_RGTC2_UNORM:
1197    case MESA_FORMAT_RG_RGTC2_SNORM:
1198    case MESA_FORMAT_L_LATC1_UNORM:
1199    case MESA_FORMAT_L_LATC1_SNORM:
1200    case MESA_FORMAT_LA_LATC2_UNORM:
1201    case MESA_FORMAT_LA_LATC2_SNORM:
1202    case MESA_FORMAT_ETC1_RGB8:
1203    case MESA_FORMAT_ETC2_RGB8:
1204    case MESA_FORMAT_ETC2_SRGB8:
1205    case MESA_FORMAT_ETC2_RGBA8_EAC:
1206    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
1207    case MESA_FORMAT_ETC2_R11_EAC:
1208    case MESA_FORMAT_ETC2_RG11_EAC:
1209    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
1210    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
1211    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
1212    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
1213    case MESA_FORMAT_BPTC_RGBA_UNORM:
1214    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
1215    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
1216    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
1217       /* XXX generate error instead? */
1218       *datatype = GL_UNSIGNED_BYTE;
1219       *comps = 0;
1220       return;
1221
1222    case MESA_FORMAT_RGBA_FLOAT32:
1223       *datatype = GL_FLOAT;
1224       *comps = 4;
1225       return;
1226    case MESA_FORMAT_RGBA_FLOAT16:
1227       *datatype = GL_HALF_FLOAT_ARB;
1228       *comps = 4;
1229       return;
1230    case MESA_FORMAT_RGB_FLOAT32:
1231       *datatype = GL_FLOAT;
1232       *comps = 3;
1233       return;
1234    case MESA_FORMAT_RGB_FLOAT16:
1235       *datatype = GL_HALF_FLOAT_ARB;
1236       *comps = 3;
1237       return;
1238    case MESA_FORMAT_LA_FLOAT32:
1239    case MESA_FORMAT_RG_FLOAT32:
1240       *datatype = GL_FLOAT;
1241       *comps = 2;
1242       return;
1243    case MESA_FORMAT_LA_FLOAT16:
1244    case MESA_FORMAT_RG_FLOAT16:
1245       *datatype = GL_HALF_FLOAT_ARB;
1246       *comps = 2;
1247       return;
1248    case MESA_FORMAT_A_FLOAT32:
1249    case MESA_FORMAT_L_FLOAT32:
1250    case MESA_FORMAT_I_FLOAT32:
1251    case MESA_FORMAT_R_FLOAT32:
1252       *datatype = GL_FLOAT;
1253       *comps = 1;
1254       return;
1255    case MESA_FORMAT_A_FLOAT16:
1256    case MESA_FORMAT_L_FLOAT16:
1257    case MESA_FORMAT_I_FLOAT16:
1258    case MESA_FORMAT_R_FLOAT16:
1259       *datatype = GL_HALF_FLOAT_ARB;
1260       *comps = 1;
1261       return;
1262
1263    case MESA_FORMAT_A_UINT8:
1264    case MESA_FORMAT_L_UINT8:
1265    case MESA_FORMAT_I_UINT8:
1266       *datatype = GL_UNSIGNED_BYTE;
1267       *comps = 1;
1268       return;
1269    case MESA_FORMAT_LA_UINT8:
1270       *datatype = GL_UNSIGNED_BYTE;
1271       *comps = 2;
1272       return;
1273
1274    case MESA_FORMAT_A_UINT16:
1275    case MESA_FORMAT_L_UINT16:
1276    case MESA_FORMAT_I_UINT16:
1277       *datatype = GL_UNSIGNED_SHORT;
1278       *comps = 1;
1279       return;
1280    case MESA_FORMAT_LA_UINT16:
1281       *datatype = GL_UNSIGNED_SHORT;
1282       *comps = 2;
1283       return;
1284    case MESA_FORMAT_A_UINT32:
1285    case MESA_FORMAT_L_UINT32:
1286    case MESA_FORMAT_I_UINT32:
1287       *datatype = GL_UNSIGNED_INT;
1288       *comps = 1;
1289       return;
1290    case MESA_FORMAT_LA_UINT32:
1291       *datatype = GL_UNSIGNED_INT;
1292       *comps = 2;
1293       return;
1294    case MESA_FORMAT_A_SINT8:
1295    case MESA_FORMAT_L_SINT8:
1296    case MESA_FORMAT_I_SINT8:
1297       *datatype = GL_BYTE;
1298       *comps = 1;
1299       return;
1300    case MESA_FORMAT_LA_SINT8:
1301       *datatype = GL_BYTE;
1302       *comps = 2;
1303       return;
1304
1305    case MESA_FORMAT_A_SINT16:
1306    case MESA_FORMAT_L_SINT16:
1307    case MESA_FORMAT_I_SINT16:
1308       *datatype = GL_SHORT;
1309       *comps = 1;
1310       return;
1311    case MESA_FORMAT_LA_SINT16:
1312       *datatype = GL_SHORT;
1313       *comps = 2;
1314       return;
1315
1316    case MESA_FORMAT_A_SINT32:
1317    case MESA_FORMAT_L_SINT32:
1318    case MESA_FORMAT_I_SINT32:
1319       *datatype = GL_INT;
1320       *comps = 1;
1321       return;
1322    case MESA_FORMAT_LA_SINT32:
1323       *datatype = GL_INT;
1324       *comps = 2;
1325       return;
1326
1327    case MESA_FORMAT_R_SINT8:
1328       *datatype = GL_BYTE;
1329       *comps = 1;
1330       return;
1331    case MESA_FORMAT_RG_SINT8:
1332       *datatype = GL_BYTE;
1333       *comps = 2;
1334       return;
1335    case MESA_FORMAT_RGB_SINT8:
1336       *datatype = GL_BYTE;
1337       *comps = 3;
1338       return;
1339    case MESA_FORMAT_RGBA_SINT8:
1340       *datatype = GL_BYTE;
1341       *comps = 4;
1342       return;
1343    case MESA_FORMAT_R_SINT16:
1344       *datatype = GL_SHORT;
1345       *comps = 1;
1346       return;
1347    case MESA_FORMAT_RG_SINT16:
1348       *datatype = GL_SHORT;
1349       *comps = 2;
1350       return;
1351    case MESA_FORMAT_RGB_SINT16:
1352       *datatype = GL_SHORT;
1353       *comps = 3;
1354       return;
1355    case MESA_FORMAT_RGBA_SINT16:
1356       *datatype = GL_SHORT;
1357       *comps = 4;
1358       return;
1359    case MESA_FORMAT_R_SINT32:
1360       *datatype = GL_INT;
1361       *comps = 1;
1362       return;
1363    case MESA_FORMAT_RG_SINT32:
1364       *datatype = GL_INT;
1365       *comps = 2;
1366       return;
1367    case MESA_FORMAT_RGB_SINT32:
1368       *datatype = GL_INT;
1369       *comps = 3;
1370       return;
1371    case MESA_FORMAT_RGBA_SINT32:
1372       *datatype = GL_INT;
1373       *comps = 4;
1374       return;
1375
1376    /**
1377     * \name Non-normalized unsigned integer formats.
1378     */
1379    case MESA_FORMAT_R_UINT8:
1380       *datatype = GL_UNSIGNED_BYTE;
1381       *comps = 1;
1382       return;
1383    case MESA_FORMAT_RG_UINT8:
1384       *datatype = GL_UNSIGNED_BYTE;
1385       *comps = 2;
1386       return;
1387    case MESA_FORMAT_RGB_UINT8:
1388       *datatype = GL_UNSIGNED_BYTE;
1389       *comps = 3;
1390       return;
1391    case MESA_FORMAT_RGBA_UINT8:
1392       *datatype = GL_UNSIGNED_BYTE;
1393       *comps = 4;
1394       return;
1395    case MESA_FORMAT_R_UINT16:
1396       *datatype = GL_UNSIGNED_SHORT;
1397       *comps = 1;
1398       return;
1399    case MESA_FORMAT_RG_UINT16:
1400       *datatype = GL_UNSIGNED_SHORT;
1401       *comps = 2;
1402       return;
1403    case MESA_FORMAT_RGB_UINT16:
1404       *datatype = GL_UNSIGNED_SHORT;
1405       *comps = 3;
1406       return;
1407    case MESA_FORMAT_RGBA_UINT16:
1408       *datatype = GL_UNSIGNED_SHORT;
1409       *comps = 4;
1410       return;
1411    case MESA_FORMAT_R_UINT32:
1412       *datatype = GL_UNSIGNED_INT;
1413       *comps = 1;
1414       return;
1415    case MESA_FORMAT_RG_UINT32:
1416       *datatype = GL_UNSIGNED_INT;
1417       *comps = 2;
1418       return;
1419    case MESA_FORMAT_RGB_UINT32:
1420       *datatype = GL_UNSIGNED_INT;
1421       *comps = 3;
1422       return;
1423    case MESA_FORMAT_RGBA_UINT32:
1424       *datatype = GL_UNSIGNED_INT;
1425       *comps = 4;
1426       return;
1427
1428    case MESA_FORMAT_R9G9B9E5_FLOAT:
1429       *datatype = GL_UNSIGNED_INT_5_9_9_9_REV;
1430       *comps = 3;
1431       return;
1432
1433    case MESA_FORMAT_R11G11B10_FLOAT:
1434       *datatype = GL_UNSIGNED_INT_10F_11F_11F_REV;
1435       *comps = 3;
1436       return;
1437
1438    case MESA_FORMAT_B10G10R10A2_UINT:
1439    case MESA_FORMAT_R10G10B10A2_UINT:
1440       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1441       *comps = 4;
1442       return;
1443
1444    case MESA_FORMAT_R8G8B8X8_SRGB:
1445    case MESA_FORMAT_X8B8G8R8_SRGB:
1446    case MESA_FORMAT_RGBX_UINT8:
1447       *datatype = GL_UNSIGNED_BYTE;
1448       *comps = 4;
1449       return;
1450
1451    case MESA_FORMAT_R8G8B8X8_SNORM:
1452    case MESA_FORMAT_RGBX_SINT8:
1453       *datatype = GL_BYTE;
1454       *comps = 4;
1455       return;
1456
1457    case MESA_FORMAT_B10G10R10X2_UNORM:
1458       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1459       *comps = 4;
1460       return;
1461
1462    case MESA_FORMAT_RGBX_UNORM16:
1463    case MESA_FORMAT_RGBX_UINT16:
1464       *datatype = GL_UNSIGNED_SHORT;
1465       *comps = 4;
1466       return;
1467
1468    case MESA_FORMAT_RGBX_SNORM16:
1469    case MESA_FORMAT_RGBX_SINT16:
1470       *datatype = GL_SHORT;
1471       *comps = 4;
1472       return;
1473
1474    case MESA_FORMAT_RGBX_FLOAT16:
1475       *datatype = GL_HALF_FLOAT;
1476       *comps = 4;
1477       return;
1478
1479    case MESA_FORMAT_RGBX_FLOAT32:
1480       *datatype = GL_FLOAT;
1481       *comps = 4;
1482       return;
1483
1484    case MESA_FORMAT_RGBX_UINT32:
1485       *datatype = GL_UNSIGNED_INT;
1486       *comps = 4;
1487       return;
1488
1489    case MESA_FORMAT_RGBX_SINT32:
1490       *datatype = GL_INT;
1491       *comps = 4;
1492       return;
1493
1494    case MESA_FORMAT_R10G10B10A2_UNORM:
1495       *datatype = GL_UNSIGNED_INT_2_10_10_10_REV;
1496       *comps = 4;
1497       return;
1498
1499    case MESA_FORMAT_G8R8_SNORM:
1500       *datatype = GL_BYTE;
1501       *comps = 2;
1502       return;
1503
1504    case MESA_FORMAT_G16R16_SNORM:
1505       *datatype = GL_SHORT;
1506       *comps = 2;
1507       return;
1508
1509    case MESA_FORMAT_B8G8R8X8_SRGB:
1510    case MESA_FORMAT_X8R8G8B8_SRGB:
1511       *datatype = GL_UNSIGNED_BYTE;
1512       *comps = 4;
1513       return;
1514
1515    case MESA_FORMAT_COUNT:
1516       assert(0);
1517       return;
1518
1519    case MESA_FORMAT_NONE:
1520    /* For debug builds, warn if any formats are not handled */
1521 #ifdef DEBUG
1522    default:
1523 #endif
1524       _mesa_problem(NULL, "bad format %s in _mesa_format_to_type_and_comps",
1525                     _mesa_get_format_name(format));
1526       *datatype = 0;
1527       *comps = 1;
1528    }
1529 }
1530
1531 /**
1532  * Check if a mesa_format exactly matches a GL format/type combination
1533  * such that we can use memcpy() from one to the other.
1534  * \param mesa_format  a MESA_FORMAT_x value
1535  * \param format  the user-specified image format
1536  * \param type  the user-specified image datatype
1537  * \param swapBytes  typically the current pixel pack/unpack byteswap state
1538  * \return GL_TRUE if the formats match, GL_FALSE otherwise.
1539  */
1540 GLboolean
1541 _mesa_format_matches_format_and_type(mesa_format mesa_format,
1542                                      GLenum format, GLenum type,
1543                                      GLboolean swapBytes)
1544 {
1545    const GLboolean littleEndian = _mesa_little_endian();
1546
1547    /* Note: When reading a GL format/type combination, the format lists channel
1548     * assignments from most significant channel in the type to least
1549     * significant.  A type with _REV indicates that the assignments are
1550     * swapped, so they are listed from least significant to most significant.
1551     *
1552     * For sanity, please keep this switch statement ordered the same as the
1553     * enums in formats.h.
1554     */
1555
1556    switch (mesa_format) {
1557
1558    case MESA_FORMAT_NONE:
1559    case MESA_FORMAT_COUNT:
1560       return GL_FALSE;
1561
1562    case MESA_FORMAT_A8B8G8R8_UNORM:
1563    case MESA_FORMAT_A8B8G8R8_SRGB:
1564       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1565          return GL_TRUE;
1566
1567       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV && swapBytes)
1568          return GL_TRUE;
1569
1570       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && !littleEndian)
1571          return GL_TRUE;
1572
1573       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV
1574           && !swapBytes)
1575          return GL_TRUE;
1576
1577       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8
1578           && swapBytes)
1579          return GL_TRUE;
1580
1581       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && littleEndian)
1582          return GL_TRUE;
1583
1584       return GL_FALSE;
1585
1586    case MESA_FORMAT_R8G8B8A8_UNORM:
1587    case MESA_FORMAT_R8G8B8A8_SRGB:
1588       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1589           !swapBytes)
1590          return GL_TRUE;
1591
1592       if (format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1593          return GL_TRUE;
1594
1595       if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && littleEndian)
1596          return GL_TRUE;
1597
1598       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8 &&
1599           !swapBytes)
1600          return GL_TRUE;
1601
1602       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1603           swapBytes)
1604          return GL_TRUE;
1605
1606       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_BYTE && !littleEndian)
1607          return GL_TRUE;
1608
1609       return GL_FALSE;
1610
1611    case MESA_FORMAT_B8G8R8A8_UNORM:
1612    case MESA_FORMAT_B8G8R8A8_SRGB:
1613       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1614           !swapBytes)
1615          return GL_TRUE;
1616
1617       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && swapBytes)
1618          return GL_TRUE;
1619
1620       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && littleEndian)
1621          return GL_TRUE;
1622
1623       return GL_FALSE;
1624
1625    case MESA_FORMAT_A8R8G8B8_UNORM:
1626    case MESA_FORMAT_A8R8G8B8_SRGB:
1627       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8 && !swapBytes)
1628          return GL_TRUE;
1629
1630       if (format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV &&
1631           swapBytes)
1632          return GL_TRUE;
1633
1634       if (format == GL_BGRA && type == GL_UNSIGNED_BYTE && !littleEndian)
1635          return GL_TRUE;
1636
1637       return GL_FALSE;
1638
1639    case MESA_FORMAT_X8B8G8R8_UNORM:
1640    case MESA_FORMAT_R8G8B8X8_UNORM:
1641       return GL_FALSE;
1642
1643    case MESA_FORMAT_B8G8R8X8_UNORM:
1644    case MESA_FORMAT_X8R8G8B8_UNORM:
1645       return GL_FALSE;
1646
1647    case MESA_FORMAT_BGR_UNORM8:
1648    case MESA_FORMAT_BGR_SRGB8:
1649       return format == GL_BGR && type == GL_UNSIGNED_BYTE && littleEndian;
1650
1651    case MESA_FORMAT_RGB_UNORM8:
1652       return format == GL_RGB && type == GL_UNSIGNED_BYTE && littleEndian;
1653
1654    case MESA_FORMAT_B5G6R5_UNORM:
1655       return ((format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) ||
1656               (format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1657               !swapBytes;
1658
1659    case MESA_FORMAT_R5G6B5_UNORM:
1660       return ((format == GL_BGR && type == GL_UNSIGNED_SHORT_5_6_5) ||
1661               (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5_REV)) &&
1662               !swapBytes;
1663
1664    case MESA_FORMAT_B4G4R4A4_UNORM:
1665       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV &&
1666          !swapBytes;
1667
1668    case MESA_FORMAT_A4R4G4B4_UNORM:
1669       return GL_FALSE;
1670
1671    case MESA_FORMAT_A1B5G5R5_UNORM:
1672       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1673          !swapBytes;
1674
1675    case MESA_FORMAT_B5G5R5A1_UNORM:
1676       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV &&
1677          !swapBytes;
1678
1679    case MESA_FORMAT_A1R5G5B5_UNORM:
1680       return format == GL_BGRA && type == GL_UNSIGNED_SHORT_5_5_5_1 &&
1681          !swapBytes;
1682
1683    case MESA_FORMAT_L4A4_UNORM:
1684       return GL_FALSE;
1685    case MESA_FORMAT_L8A8_UNORM:
1686    case MESA_FORMAT_L8A8_SRGB:
1687       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_BYTE && littleEndian;
1688    case MESA_FORMAT_A8L8_UNORM:
1689    case MESA_FORMAT_A8L8_SRGB:
1690       return GL_FALSE;
1691
1692    case MESA_FORMAT_L16A16_UNORM:
1693       return format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_SHORT && littleEndian && !swapBytes;
1694    case MESA_FORMAT_A16L16_UNORM:
1695       return GL_FALSE;
1696
1697    case MESA_FORMAT_B2G3R3_UNORM:
1698       return format == GL_RGB && type == GL_UNSIGNED_BYTE_3_3_2;
1699
1700    case MESA_FORMAT_R3G3B2_UNORM:
1701       return format == GL_RGB && type == GL_UNSIGNED_BYTE_2_3_3_REV;
1702
1703    case MESA_FORMAT_A4B4G4R4_UNORM:
1704       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1705          return GL_TRUE;
1706
1707       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1708          return GL_TRUE;
1709
1710       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1711          return GL_TRUE;
1712
1713       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1714          return GL_TRUE;
1715
1716       return GL_FALSE;
1717
1718    case MESA_FORMAT_R4G4B4A4_UNORM:
1719       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4 && !swapBytes)
1720          return GL_TRUE;
1721
1722       if (format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && swapBytes)
1723          return GL_TRUE;
1724
1725       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && !swapBytes)
1726          return GL_TRUE;
1727
1728       if (format == GL_RGBA && type == GL_UNSIGNED_SHORT_4_4_4_4 && swapBytes)
1729          return GL_TRUE;
1730
1731       return GL_FALSE;
1732
1733    case MESA_FORMAT_R1G5B5A5_UNORM:
1734       return format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_5_5_5_1;
1735
1736    case MESA_FORMAT_R5G5B5A1_UNORM:
1737       return format == GL_RGBA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
1738
1739    case MESA_FORMAT_A5B5G5R1_UNORM:
1740       return format == GL_ABGR_EXT && type == GL_UNSIGNED_SHORT_1_5_5_5_REV;
1741
1742    case MESA_FORMAT_A2B10G10R10_UNORM:
1743       return format == GL_RGBA && type == GL_UNSIGNED_INT_10_10_10_2;
1744
1745    case MESA_FORMAT_A2B10G10R10_UINT:
1746       return format == GL_RGBA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1747
1748    case MESA_FORMAT_A2R10G10B10_UNORM:
1749       return format == GL_BGRA && type == GL_UNSIGNED_INT_10_10_10_2;
1750
1751    case MESA_FORMAT_A2R10G10B10_UINT:
1752       return format == GL_BGRA_INTEGER_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1753
1754    case MESA_FORMAT_R2G10B10A10_UNORM:
1755       return format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_10_10_10_2;
1756
1757    case MESA_FORMAT_A10B10G10R2_UNORM:
1758       return format == GL_ABGR_EXT && type == GL_UNSIGNED_INT_2_10_10_10_REV;
1759
1760    case MESA_FORMAT_A_UNORM8:
1761       return format == GL_ALPHA && type == GL_UNSIGNED_BYTE;
1762    case MESA_FORMAT_A_UNORM16:
1763       return format == GL_ALPHA && type == GL_UNSIGNED_SHORT && !swapBytes;
1764    case MESA_FORMAT_L_UNORM8:
1765    case MESA_FORMAT_L_SRGB8:
1766       return format == GL_LUMINANCE && type == GL_UNSIGNED_BYTE;
1767    case MESA_FORMAT_L_UNORM16:
1768       return format == GL_LUMINANCE && type == GL_UNSIGNED_SHORT && !swapBytes;
1769    case MESA_FORMAT_I_UNORM8:
1770       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1771    case MESA_FORMAT_I_UNORM16:
1772       return format == GL_RED && type == GL_UNSIGNED_SHORT && !swapBytes;
1773
1774    case MESA_FORMAT_YCBCR:
1775       return format == GL_YCBCR_MESA &&
1776              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian != swapBytes) ||
1777               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian == swapBytes));
1778    case MESA_FORMAT_YCBCR_REV:
1779       return format == GL_YCBCR_MESA &&
1780              ((type == GL_UNSIGNED_SHORT_8_8_MESA && littleEndian == swapBytes) ||
1781               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian != swapBytes));
1782
1783    case MESA_FORMAT_R_UNORM8:
1784       return format == GL_RED && type == GL_UNSIGNED_BYTE;
1785    case MESA_FORMAT_R8G8_UNORM:
1786       return format == GL_RG && type == GL_UNSIGNED_BYTE && littleEndian;
1787    case MESA_FORMAT_G8R8_UNORM:
1788       return GL_FALSE;
1789
1790    case MESA_FORMAT_R_UNORM16:
1791       return format == GL_RED && type == GL_UNSIGNED_SHORT &&
1792          !swapBytes;
1793    case MESA_FORMAT_R16G16_UNORM:
1794       return format == GL_RG && type == GL_UNSIGNED_SHORT && littleEndian &&
1795          !swapBytes;
1796    case MESA_FORMAT_G16R16_UNORM:
1797       return GL_FALSE;
1798
1799    case MESA_FORMAT_B10G10R10A2_UNORM:
1800       return format == GL_BGRA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
1801          !swapBytes;
1802
1803    case MESA_FORMAT_S8_UINT_Z24_UNORM:
1804       return format == GL_DEPTH_STENCIL && type == GL_UNSIGNED_INT_24_8 &&
1805          !swapBytes;
1806    case MESA_FORMAT_X8_UINT_Z24_UNORM:
1807    case MESA_FORMAT_Z24_UNORM_S8_UINT:
1808       return GL_FALSE;
1809
1810    case MESA_FORMAT_Z_UNORM16:
1811       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_SHORT &&
1812          !swapBytes;
1813
1814    case MESA_FORMAT_Z24_UNORM_X8_UINT:
1815       return GL_FALSE;
1816
1817    case MESA_FORMAT_Z_UNORM32:
1818       return format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_INT &&
1819          !swapBytes;
1820
1821    case MESA_FORMAT_S_UINT8:
1822       return format == GL_STENCIL_INDEX && type == GL_UNSIGNED_BYTE;
1823
1824    case MESA_FORMAT_SRGB_DXT1:
1825    case MESA_FORMAT_SRGBA_DXT1:
1826    case MESA_FORMAT_SRGBA_DXT3:
1827    case MESA_FORMAT_SRGBA_DXT5:
1828       return GL_FALSE;
1829
1830    case MESA_FORMAT_RGB_FXT1:
1831    case MESA_FORMAT_RGBA_FXT1:
1832    case MESA_FORMAT_RGB_DXT1:
1833    case MESA_FORMAT_RGBA_DXT1:
1834    case MESA_FORMAT_RGBA_DXT3:
1835    case MESA_FORMAT_RGBA_DXT5:
1836       return GL_FALSE;
1837
1838    case MESA_FORMAT_BPTC_RGBA_UNORM:
1839    case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
1840    case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
1841    case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
1842       return GL_FALSE;
1843
1844    case MESA_FORMAT_RGBA_FLOAT32:
1845       return format == GL_RGBA && type == GL_FLOAT && !swapBytes;
1846    case MESA_FORMAT_RGBA_FLOAT16:
1847       return format == GL_RGBA && type == GL_HALF_FLOAT && !swapBytes;
1848
1849    case MESA_FORMAT_RGB_FLOAT32:
1850       return format == GL_RGB && type == GL_FLOAT && !swapBytes;
1851    case MESA_FORMAT_RGB_FLOAT16:
1852       return format == GL_RGB && type == GL_HALF_FLOAT && !swapBytes;
1853
1854    case MESA_FORMAT_A_FLOAT32:
1855       return format == GL_ALPHA && type == GL_FLOAT && !swapBytes;
1856    case MESA_FORMAT_A_FLOAT16:
1857       return format == GL_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1858
1859    case MESA_FORMAT_L_FLOAT32:
1860       return format == GL_LUMINANCE && type == GL_FLOAT && !swapBytes;
1861    case MESA_FORMAT_L_FLOAT16:
1862       return format == GL_LUMINANCE && type == GL_HALF_FLOAT && !swapBytes;
1863
1864    case MESA_FORMAT_LA_FLOAT32:
1865       return format == GL_LUMINANCE_ALPHA && type == GL_FLOAT && !swapBytes;
1866    case MESA_FORMAT_LA_FLOAT16:
1867       return format == GL_LUMINANCE_ALPHA && type == GL_HALF_FLOAT && !swapBytes;
1868
1869    case MESA_FORMAT_I_FLOAT32:
1870       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1871    case MESA_FORMAT_I_FLOAT16:
1872       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1873
1874    case MESA_FORMAT_R_FLOAT32:
1875       return format == GL_RED && type == GL_FLOAT && !swapBytes;
1876    case MESA_FORMAT_R_FLOAT16:
1877       return format == GL_RED && type == GL_HALF_FLOAT && !swapBytes;
1878
1879    case MESA_FORMAT_RG_FLOAT32:
1880       return format == GL_RG && type == GL_FLOAT && !swapBytes;
1881    case MESA_FORMAT_RG_FLOAT16:
1882       return format == GL_RG && type == GL_HALF_FLOAT && !swapBytes;
1883
1884    case MESA_FORMAT_A_UINT8:
1885       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_BYTE;
1886    case MESA_FORMAT_A_UINT16:
1887       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_SHORT &&
1888              !swapBytes;
1889    case MESA_FORMAT_A_UINT32:
1890       return format == GL_ALPHA_INTEGER && type == GL_UNSIGNED_INT &&
1891              !swapBytes;
1892    case MESA_FORMAT_A_SINT8:
1893       return format == GL_ALPHA_INTEGER && type == GL_BYTE;
1894    case MESA_FORMAT_A_SINT16:
1895       return format == GL_ALPHA_INTEGER && type == GL_SHORT && !swapBytes;
1896    case MESA_FORMAT_A_SINT32:
1897       return format == GL_ALPHA_INTEGER && type == GL_INT && !swapBytes;
1898
1899    case MESA_FORMAT_I_UINT8:
1900       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1901    case MESA_FORMAT_I_UINT16:
1902       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1903    case MESA_FORMAT_I_UINT32:
1904       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1905    case MESA_FORMAT_I_SINT8:
1906       return format == GL_RED_INTEGER && type == GL_BYTE;
1907    case MESA_FORMAT_I_SINT16:
1908       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1909    case MESA_FORMAT_I_SINT32:
1910       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1911
1912    case MESA_FORMAT_L_UINT8:
1913       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_BYTE;
1914    case MESA_FORMAT_L_UINT16:
1915       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_SHORT &&
1916              !swapBytes;
1917    case MESA_FORMAT_L_UINT32:
1918       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_UNSIGNED_INT &&
1919              !swapBytes;
1920    case MESA_FORMAT_L_SINT8:
1921       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_BYTE;
1922    case MESA_FORMAT_L_SINT16:
1923       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_SHORT &&
1924              !swapBytes;
1925    case MESA_FORMAT_L_SINT32:
1926       return format == GL_LUMINANCE_INTEGER_EXT && type == GL_INT && !swapBytes;
1927
1928    case MESA_FORMAT_LA_UINT8:
1929       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1930              type == GL_UNSIGNED_BYTE && !swapBytes;
1931    case MESA_FORMAT_LA_UINT16:
1932       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1933              type == GL_UNSIGNED_SHORT && !swapBytes;
1934    case MESA_FORMAT_LA_UINT32:
1935       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT &&
1936              type == GL_UNSIGNED_INT && !swapBytes;
1937    case MESA_FORMAT_LA_SINT8:
1938       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_BYTE &&
1939              !swapBytes;
1940    case MESA_FORMAT_LA_SINT16:
1941       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_SHORT &&
1942              !swapBytes;
1943    case MESA_FORMAT_LA_SINT32:
1944       return format == GL_LUMINANCE_ALPHA_INTEGER_EXT && type == GL_INT &&
1945              !swapBytes;
1946
1947    case MESA_FORMAT_R_SINT8:
1948       return format == GL_RED_INTEGER && type == GL_BYTE;
1949    case MESA_FORMAT_RG_SINT8:
1950       return format == GL_RG_INTEGER && type == GL_BYTE && !swapBytes;
1951    case MESA_FORMAT_RGB_SINT8:
1952       return format == GL_RGB_INTEGER && type == GL_BYTE && !swapBytes;
1953    case MESA_FORMAT_RGBA_SINT8:
1954       return format == GL_RGBA_INTEGER && type == GL_BYTE && !swapBytes;
1955    case MESA_FORMAT_R_SINT16:
1956       return format == GL_RED_INTEGER && type == GL_SHORT && !swapBytes;
1957    case MESA_FORMAT_RG_SINT16:
1958       return format == GL_RG_INTEGER && type == GL_SHORT && !swapBytes;
1959    case MESA_FORMAT_RGB_SINT16:
1960       return format == GL_RGB_INTEGER && type == GL_SHORT && !swapBytes;
1961    case MESA_FORMAT_RGBA_SINT16:
1962       return format == GL_RGBA_INTEGER && type == GL_SHORT && !swapBytes;
1963    case MESA_FORMAT_R_SINT32:
1964       return format == GL_RED_INTEGER && type == GL_INT && !swapBytes;
1965    case MESA_FORMAT_RG_SINT32:
1966       return format == GL_RG_INTEGER && type == GL_INT && !swapBytes;
1967    case MESA_FORMAT_RGB_SINT32:
1968       return format == GL_RGB_INTEGER && type == GL_INT && !swapBytes;
1969    case MESA_FORMAT_RGBA_SINT32:
1970       return format == GL_RGBA_INTEGER && type == GL_INT && !swapBytes;
1971
1972    case MESA_FORMAT_R_UINT8:
1973       return format == GL_RED_INTEGER && type == GL_UNSIGNED_BYTE;
1974    case MESA_FORMAT_RG_UINT8:
1975       return format == GL_RG_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1976    case MESA_FORMAT_RGB_UINT8:
1977       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_BYTE && !swapBytes;
1978    case MESA_FORMAT_RGBA_UINT8:
1979       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_BYTE &&
1980              !swapBytes;
1981    case MESA_FORMAT_R_UINT16:
1982       return format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT &&
1983              !swapBytes;
1984    case MESA_FORMAT_RG_UINT16:
1985       return format == GL_RG_INTEGER && type == GL_UNSIGNED_SHORT && !swapBytes;
1986    case MESA_FORMAT_RGB_UINT16:
1987       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_SHORT &&
1988              !swapBytes;
1989    case MESA_FORMAT_RGBA_UINT16:
1990       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_SHORT &&
1991              !swapBytes;
1992    case MESA_FORMAT_R_UINT32:
1993       return format == GL_RED_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1994    case MESA_FORMAT_RG_UINT32:
1995       return format == GL_RG_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1996    case MESA_FORMAT_RGB_UINT32:
1997       return format == GL_RGB_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
1998    case MESA_FORMAT_RGBA_UINT32:
1999       return format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT && !swapBytes;
2000
2001    case MESA_FORMAT_R_SNORM8:
2002       return format == GL_RED && type == GL_BYTE;
2003    case MESA_FORMAT_R8G8_SNORM:
2004       return format == GL_RG && type == GL_BYTE && littleEndian &&
2005              !swapBytes;
2006    case MESA_FORMAT_X8B8G8R8_SNORM:
2007       return GL_FALSE;
2008
2009    case MESA_FORMAT_A8B8G8R8_SNORM:
2010       if (format == GL_RGBA && type == GL_BYTE && !littleEndian)
2011          return GL_TRUE;
2012
2013       if (format == GL_ABGR_EXT && type == GL_BYTE && littleEndian)
2014          return GL_TRUE;
2015
2016       return GL_FALSE;
2017
2018    case MESA_FORMAT_R8G8B8A8_SNORM:
2019       if (format == GL_RGBA && type == GL_BYTE && littleEndian)
2020          return GL_TRUE;
2021
2022       if (format == GL_ABGR_EXT && type == GL_BYTE && !littleEndian)
2023          return GL_TRUE;
2024
2025       return GL_FALSE;
2026
2027    case MESA_FORMAT_R_SNORM16:
2028       return format == GL_RED && type == GL_SHORT &&
2029              !swapBytes;
2030    case MESA_FORMAT_R16G16_SNORM:
2031       return format == GL_RG && type == GL_SHORT && littleEndian && !swapBytes;
2032    case MESA_FORMAT_RGB_SNORM16:
2033       return format == GL_RGB && type == GL_SHORT && !swapBytes;
2034    case MESA_FORMAT_RGBA_SNORM16:
2035       return format == GL_RGBA && type == GL_SHORT && !swapBytes;
2036    case MESA_FORMAT_RGBA_UNORM16:
2037       return format == GL_RGBA && type == GL_UNSIGNED_SHORT &&
2038              !swapBytes;
2039
2040    case MESA_FORMAT_R_RGTC1_UNORM:
2041    case MESA_FORMAT_R_RGTC1_SNORM:
2042    case MESA_FORMAT_RG_RGTC2_UNORM:
2043    case MESA_FORMAT_RG_RGTC2_SNORM:
2044       return GL_FALSE;
2045
2046    case MESA_FORMAT_L_LATC1_UNORM:
2047    case MESA_FORMAT_L_LATC1_SNORM:
2048    case MESA_FORMAT_LA_LATC2_UNORM:
2049    case MESA_FORMAT_LA_LATC2_SNORM:
2050       return GL_FALSE;
2051
2052    case MESA_FORMAT_ETC1_RGB8:
2053    case MESA_FORMAT_ETC2_RGB8:
2054    case MESA_FORMAT_ETC2_SRGB8:
2055    case MESA_FORMAT_ETC2_RGBA8_EAC:
2056    case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
2057    case MESA_FORMAT_ETC2_R11_EAC:
2058    case MESA_FORMAT_ETC2_RG11_EAC:
2059    case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
2060    case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
2061    case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
2062    case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
2063       return GL_FALSE;
2064
2065    case MESA_FORMAT_A_SNORM8:
2066       return format == GL_ALPHA && type == GL_BYTE;
2067    case MESA_FORMAT_L_SNORM8:
2068       return format == GL_LUMINANCE && type == GL_BYTE;
2069    case MESA_FORMAT_L8A8_SNORM:
2070       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
2071              littleEndian && !swapBytes;
2072    case MESA_FORMAT_A8L8_SNORM:
2073       return format == GL_LUMINANCE_ALPHA && type == GL_BYTE &&
2074              !littleEndian && !swapBytes;
2075    case MESA_FORMAT_I_SNORM8:
2076       return format == GL_RED && type == GL_BYTE;
2077    case MESA_FORMAT_A_SNORM16:
2078       return format == GL_ALPHA && type == GL_SHORT && !swapBytes;
2079    case MESA_FORMAT_L_SNORM16:
2080       return format == GL_LUMINANCE && type == GL_SHORT && !swapBytes;
2081    case MESA_FORMAT_LA_SNORM16:
2082       return format == GL_LUMINANCE_ALPHA && type == GL_SHORT &&
2083              littleEndian && !swapBytes;
2084    case MESA_FORMAT_I_SNORM16:
2085       return format == GL_RED && type == GL_SHORT && littleEndian &&
2086              !swapBytes;
2087
2088    case MESA_FORMAT_B10G10R10A2_UINT:
2089       return (format == GL_BGRA_INTEGER_EXT &&
2090               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2091               !swapBytes);
2092
2093    case MESA_FORMAT_R10G10B10A2_UINT:
2094       return (format == GL_RGBA_INTEGER_EXT &&
2095               type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2096               !swapBytes);
2097
2098    case MESA_FORMAT_R9G9B9E5_FLOAT:
2099       return format == GL_RGB && type == GL_UNSIGNED_INT_5_9_9_9_REV &&
2100          !swapBytes;
2101
2102    case MESA_FORMAT_R11G11B10_FLOAT:
2103       return format == GL_RGB && type == GL_UNSIGNED_INT_10F_11F_11F_REV &&
2104          !swapBytes;
2105
2106    case MESA_FORMAT_Z_FLOAT32:
2107       return format == GL_DEPTH_COMPONENT && type == GL_FLOAT && !swapBytes;
2108
2109    case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
2110       return format == GL_DEPTH_STENCIL &&
2111              type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV && !swapBytes;
2112
2113    case MESA_FORMAT_B4G4R4X4_UNORM:
2114    case MESA_FORMAT_B5G5R5X1_UNORM:
2115    case MESA_FORMAT_R8G8B8X8_SNORM:
2116    case MESA_FORMAT_R8G8B8X8_SRGB:
2117    case MESA_FORMAT_X8B8G8R8_SRGB:
2118    case MESA_FORMAT_RGBX_UINT8:
2119    case MESA_FORMAT_RGBX_SINT8:
2120    case MESA_FORMAT_B10G10R10X2_UNORM:
2121    case MESA_FORMAT_RGBX_UNORM16:
2122    case MESA_FORMAT_RGBX_SNORM16:
2123    case MESA_FORMAT_RGBX_FLOAT16:
2124    case MESA_FORMAT_RGBX_UINT16:
2125    case MESA_FORMAT_RGBX_SINT16:
2126    case MESA_FORMAT_RGBX_FLOAT32:
2127    case MESA_FORMAT_RGBX_UINT32:
2128    case MESA_FORMAT_RGBX_SINT32:
2129       return GL_FALSE;
2130
2131    case MESA_FORMAT_R10G10B10A2_UNORM:
2132       return format == GL_RGBA && type == GL_UNSIGNED_INT_2_10_10_10_REV &&
2133          !swapBytes;
2134
2135    case MESA_FORMAT_G8R8_SNORM:
2136       return format == GL_RG && type == GL_BYTE && !littleEndian &&
2137          !swapBytes;
2138
2139    case MESA_FORMAT_G16R16_SNORM:
2140       return format == GL_RG && type == GL_SHORT && !littleEndian &&
2141          !swapBytes;
2142
2143    case MESA_FORMAT_B8G8R8X8_SRGB:
2144    case MESA_FORMAT_X8R8G8B8_SRGB:
2145       return GL_FALSE;
2146    }
2147
2148    return GL_FALSE;
2149 }
2150