src/gallium/auxiliary/util/u_format.h

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  27
  28
  29 #ifndef U_FORMAT_H
  30 #define U_FORMAT_H
  31
  32
  33 #include "pipe/p_format.h"
  34 #include "pipe/p_defines.h"
  35 #include "util/u_debug.h"
  36
  37 union pipe_color_union;
  38
  39
  40 #ifdef __cplusplus
  41 extern "C" {
  42 #endif
  43
  44
  45 /**
  46  * Describe how to pack/unpack pixels into/from the prescribed format.
  47  *
  48  * XXX: This could be renamed to something like util_format_pack, or broke down
  49  * in flags inside util_format_block that said exactly what we want.
  50  */
  51 enum util_format_layout {
  52    /**
  53     * Formats with util_format_block::width == util_format_block::height == 1
  54     * that can be described as an ordinary data structure.
  55     */
  56    UTIL_FORMAT_LAYOUT_PLAIN = 0,
  57
  58    /**
  59     * Formats with sub-sampled channels.
  60     *
  61     * This is for formats like YVYU where there is less than one sample per
  62     * pixel.
  63     */
  64    UTIL_FORMAT_LAYOUT_SUBSAMPLED = 3,
  65
  66    /**
  67     * S3 Texture Compression formats.
  68     */
  69    UTIL_FORMAT_LAYOUT_S3TC = 4,
  70
  71    /**
  72     * Red-Green Texture Compression formats.
  73     */
  74    UTIL_FORMAT_LAYOUT_RGTC = 5,
  75
  76    /**
  77     * Ericsson Texture Compression
  78     */
  79    UTIL_FORMAT_LAYOUT_ETC = 6,
  80
  81    /**
  82     * Everything else that doesn't fit in any of the above layouts.
  83     */
  84    UTIL_FORMAT_LAYOUT_OTHER = 7
  85 };
  86
  87
  88 struct util_format_block
  89 {
  90    /** Block width in pixels */
  91    unsigned width;
  92
  93    /** Block height in pixels */
  94    unsigned height;
  95
  96    /** Block size in bits */
  97    unsigned bits;
  98 };
  99
 100
 101 enum util_format_type {
 102    UTIL_FORMAT_TYPE_VOID = 0,
 103    UTIL_FORMAT_TYPE_UNSIGNED = 1,
 104    UTIL_FORMAT_TYPE_SIGNED = 2,
 105    UTIL_FORMAT_TYPE_FIXED = 3,
 106    UTIL_FORMAT_TYPE_FLOAT = 4
 107 };
 108
 109
 110 enum util_format_swizzle {
 111    UTIL_FORMAT_SWIZZLE_X = 0,
 112    UTIL_FORMAT_SWIZZLE_Y = 1,
 113    UTIL_FORMAT_SWIZZLE_Z = 2,
 114    UTIL_FORMAT_SWIZZLE_W = 3,
 115    UTIL_FORMAT_SWIZZLE_0 = 4,
 116    UTIL_FORMAT_SWIZZLE_1 = 5,
 117    UTIL_FORMAT_SWIZZLE_NONE = 6,
 118    UTIL_FORMAT_SWIZZLE_MAX = 7  /**< Number of enums counter (must be last) */
 119 };
 120
 121
 122 enum util_format_colorspace {
 123    UTIL_FORMAT_COLORSPACE_RGB = 0,
 124    UTIL_FORMAT_COLORSPACE_SRGB = 1,
 125    UTIL_FORMAT_COLORSPACE_YUV = 2,
 126    UTIL_FORMAT_COLORSPACE_ZS = 3
 127 };
 128
 129
 130 struct util_format_channel_description
 131 {
 132    unsigned type:5;        /**< UTIL_FORMAT_TYPE_x */
 133    unsigned normalized:1;
 134    unsigned pure_integer:1;
 135    unsigned size:9;        /**< bits per channel */
 136    unsigned shift:16;      /** number of bits from lsb */
 137 };
 138
 139
 140 struct util_format_description
 141 {
 142    enum pipe_format format;
 143
 144    const char *name;
 145
 146    /**
 147     * Short name, striped of the prefix, lower case.
 148     */
 149    const char *short_name;
 150
 151    /**
 152     * Pixel block dimensions.
 153     */
 154    struct util_format_block block;
 155
 156    enum util_format_layout layout;
 157
 158    /**
 159     * The number of channels.
 160     */
 161    unsigned nr_channels:3;
 162
 163    /**
 164     * Whether all channels have the same number of (whole) bytes and type.
 165     */
 166    unsigned is_array:1;
 167
 168    /**
 169     * Whether the pixel format can be described as a bitfield structure.
 170     *
 171     * In particular:
 172     * - pixel depth must be 8, 16, or 32 bits;
 173     * - all channels must be unsigned, signed, or void
 174     */
 175    unsigned is_bitmask:1;
 176
 177    /**
 178     * Whether channels have mixed types (ignoring UTIL_FORMAT_TYPE_VOID).
 179     */
 180    unsigned is_mixed:1;
 181
 182    /**
 183     * Input channel description, in the order XYZW.
 184     *
 185     * Only valid for UTIL_FORMAT_LAYOUT_PLAIN formats.
 186     *
 187     * If each channel is accessed as an individual N-byte value, X is always
 188     * at the lowest address in memory, Y is always next, and so on.  For all
 189     * currently-defined formats, the N-byte value has native endianness.
 190     *
 191     * If instead a group of channels is accessed as a single N-byte value,
 192     * the order of the channels within that value depends on endianness.
 193     * For big-endian targets, X is the most significant subvalue,
 194     * otherwise it is the least significant one.
 195     *
 196     * For example, if X is 8 bits and Y is 24 bits, the memory order is:
 197     *
 198     *                 0  1  2  3
 199     *  little-endian: X  Yl Ym Yu    (l = lower, m = middle, u = upper)
 200     *  big-endian:    X  Yu Ym Yl
 201     *
 202     * If X is 5 bits, Y is 5 bits, Z is 5 bits and W is 1 bit, the layout is:
 203     *
 204     *                        0        1
 205     *                 msb  lsb msb  lsb
 206     *  little-endian: YYYXXXXX WZZZZZYY
 207     *  big-endian:    XXXXXYYY YYZZZZZW
 208     */
 209    struct util_format_channel_description channel[4];
 210
 211    /**
 212     * Output channel swizzle.
 213     *
 214     * The order is either:
 215     * - RGBA
 216     * - YUV(A)
 217     * - ZS
 218     * depending on the colorspace.
 219     */
 220    unsigned char swizzle[4];
 221
 222    /**
 223     * Colorspace transformation.
 224     */
 225    enum util_format_colorspace colorspace;
 226
 227    /**
 228     * Unpack pixel blocks to R8G8B8A8_UNORM.
 229     * Note: strides are in bytes.
 230     *
 231     * Only defined for non-depth-stencil formats.
 232     */
 233    void
 234    (*unpack_rgba_8unorm)(uint8_t *dst, unsigned dst_stride,
 235                          const uint8_t *src, unsigned src_stride,
 236                          unsigned width, unsigned height);
 237
 238    /**
 239     * Pack pixel blocks from R8G8B8A8_UNORM.
 240     * Note: strides are in bytes.
 241     *
 242     * Only defined for non-depth-stencil formats.
 243     */
 244    void
 245    (*pack_rgba_8unorm)(uint8_t *dst, unsigned dst_stride,
 246                        const uint8_t *src, unsigned src_stride,
 247                        unsigned width, unsigned height);
 248
 249    /**
 250     * Fetch a single pixel (i, j) from a block.
 251     *
 252     * XXX: Only defined for a very few select formats.
 253     */
 254    void
 255    (*fetch_rgba_8unorm)(uint8_t *dst,
 256                         const uint8_t *src,
 257                         unsigned i, unsigned j);
 258
 259    /**
 260     * Unpack pixel blocks to R32G32B32A32_FLOAT.
 261     * Note: strides are in bytes.
 262     *
 263     * Only defined for non-depth-stencil formats.
 264     */
 265    void
 266    (*unpack_rgba_float)(float *dst, unsigned dst_stride,
 267                         const uint8_t *src, unsigned src_stride,
 268                         unsigned width, unsigned height);
 269
 270    /**
 271     * Pack pixel blocks from R32G32B32A32_FLOAT.
 272     * Note: strides are in bytes.
 273     *
 274     * Only defined for non-depth-stencil formats.
 275     */
 276    void
 277    (*pack_rgba_float)(uint8_t *dst, unsigned dst_stride,
 278                       const float *src, unsigned src_stride,
 279                       unsigned width, unsigned height);
 280
 281    /**
 282     * Fetch a single pixel (i, j) from a block.
 283     *
 284     * Only defined for non-depth-stencil and non-integer formats.
 285     */
 286    void
 287    (*fetch_rgba_float)(float *dst,
 288                        const uint8_t *src,
 289                        unsigned i, unsigned j);
 290
 291    /**
 292     * Unpack pixels to Z32_UNORM.
 293     * Note: strides are in bytes.
 294     *
 295     * Only defined for depth formats.
 296     */
 297    void
 298    (*unpack_z_32unorm)(uint32_t *dst, unsigned dst_stride,
 299                        const uint8_t *src, unsigned src_stride,
 300                        unsigned width, unsigned height);
 301
 302    /**
 303     * Pack pixels from Z32_FLOAT.
 304     * Note: strides are in bytes.
 305     *
 306     * Only defined for depth formats.
 307     */
 308    void
 309    (*pack_z_32unorm)(uint8_t *dst, unsigned dst_stride,
 310                      const uint32_t *src, unsigned src_stride,
 311                      unsigned width, unsigned height);
 312
 313    /**
 314     * Unpack pixels to Z32_FLOAT.
 315     * Note: strides are in bytes.
 316     *
 317     * Only defined for depth formats.
 318     */
 319    void
 320    (*unpack_z_float)(float *dst, unsigned dst_stride,
 321                      const uint8_t *src, unsigned src_stride,
 322                      unsigned width, unsigned height);
 323
 324    /**
 325     * Pack pixels from Z32_FLOAT.
 326     * Note: strides are in bytes.
 327     *
 328     * Only defined for depth formats.
 329     */
 330    void
 331    (*pack_z_float)(uint8_t *dst, unsigned dst_stride,
 332                    const float *src, unsigned src_stride,
 333                    unsigned width, unsigned height);
 334
 335    /**
 336     * Unpack pixels to S8_UINT.
 337     * Note: strides are in bytes.
 338     *
 339     * Only defined for stencil formats.
 340     */
 341    void
 342    (*unpack_s_8uint)(uint8_t *dst, unsigned dst_stride,
 343                      const uint8_t *src, unsigned src_stride,
 344                      unsigned width, unsigned height);
 345
 346    /**
 347     * Pack pixels from S8_UINT.
 348     * Note: strides are in bytes.
 349     *
 350     * Only defined for stencil formats.
 351     */
 352    void
 353    (*pack_s_8uint)(uint8_t *dst, unsigned dst_stride,
 354                    const uint8_t *src, unsigned src_stride,
 355                    unsigned width, unsigned height);
 356
 357   /**
 358     * Unpack pixel blocks to R32G32B32A32_UINT.
 359     * Note: strides are in bytes.
 360     *
 361     * Only defined for INT formats.
 362     */
 363    void
 364    (*unpack_rgba_uint)(unsigned *dst, unsigned dst_stride,
 365                        const uint8_t *src, unsigned src_stride,
 366                        unsigned width, unsigned height);
 367
 368    void
 369    (*pack_rgba_uint)(uint8_t *dst, unsigned dst_stride,
 370                      const unsigned *src, unsigned src_stride,
 371                      unsigned width, unsigned height);
 372
 373   /**
 374     * Unpack pixel blocks to R32G32B32A32_SINT.
 375     * Note: strides are in bytes.
 376     *
 377     * Only defined for INT formats.
 378     */
 379    void
 380    (*unpack_rgba_sint)(signed *dst, unsigned dst_stride,
 381                        const uint8_t *src, unsigned src_stride,
 382                        unsigned width, unsigned height);
 383
 384    void
 385    (*pack_rgba_sint)(uint8_t *dst, unsigned dst_stride,
 386                      const int *src, unsigned src_stride,
 387                      unsigned width, unsigned height);
 388
 389    /**
 390     * Fetch a single pixel (i, j) from a block.
 391     *
 392     * Only defined for unsigned (pure) integer formats.
 393     */
 394    void
 395    (*fetch_rgba_uint)(uint32_t *dst,
 396                       const uint8_t *src,
 397                       unsigned i, unsigned j);
 398
 399    /**
 400     * Fetch a single pixel (i, j) from a block.
 401     *
 402     * Only defined for signed (pure) integer formats.
 403     */
 404    void
 405    (*fetch_rgba_sint)(int32_t *dst,
 406                       const uint8_t *src,
 407                       unsigned i, unsigned j);
 408 };
 409
 410
 411 extern const struct util_format_description
 412 util_format_description_table[];
 413
 414
 415 const struct util_format_description *
 416 util_format_description(enum pipe_format format);
 417
 418
 419 /*
 420  * Format query functions.
 421  */
 422
 423 static INLINE const char *
 424 util_format_name(enum pipe_format format)
 425 {
 426    const struct util_format_description *desc = util_format_description(format);
 427
 428    assert(desc);
 429    if (!desc) {
 430       return "PIPE_FORMAT_???";
 431    }
 432
 433    return desc->name;
 434 }
 435
 436 static INLINE const char *
 437 util_format_short_name(enum pipe_format format)
 438 {
 439    const struct util_format_description *desc = util_format_description(format);
 440
 441    assert(desc);
 442    if (!desc) {
 443       return "???";
 444    }
 445
 446    return desc->short_name;
 447 }
 448
 449 /**
 450  * Whether this format is plain, see UTIL_FORMAT_LAYOUT_PLAIN for more info.
 451  */
 452 static INLINE boolean
 453 util_format_is_plain(enum pipe_format format)
 454 {
 455    const struct util_format_description *desc = util_format_description(format);
 456
 457    if (!format) {
 458       return FALSE;
 459    }
 460
 461    return desc->layout == UTIL_FORMAT_LAYOUT_PLAIN ? TRUE : FALSE;
 462 }
 463
 464 static INLINE boolean
 465 util_format_is_compressed(enum pipe_format format)
 466 {
 467    const struct util_format_description *desc = util_format_description(format);
 468
 469    assert(desc);
 470    if (!desc) {
 471       return FALSE;
 472    }
 473
 474    switch (desc->layout) {
 475    case UTIL_FORMAT_LAYOUT_S3TC:
 476    case UTIL_FORMAT_LAYOUT_RGTC:
 477    case UTIL_FORMAT_LAYOUT_ETC:
 478       /* XXX add other formats in the future */
 479       return TRUE;
 480    default:
 481       return FALSE;
 482    }
 483 }
 484
 485 static INLINE boolean
 486 util_format_is_s3tc(enum pipe_format format)
 487 {
 488    const struct util_format_description *desc = util_format_description(format);
 489
 490    assert(desc);
 491    if (!desc) {
 492       return FALSE;
 493    }
 494
 495    return desc->layout == UTIL_FORMAT_LAYOUT_S3TC ? TRUE : FALSE;
 496 }
 497
 498 static INLINE boolean
 499 util_format_is_srgb(enum pipe_format format)
 500 {
 501    const struct util_format_description *desc = util_format_description(format);
 502    return desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB;
 503 }
 504
 505 static INLINE boolean
 506 util_format_has_depth(const struct util_format_description *desc)
 507 {
 508    return desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS &&
 509           desc->swizzle[0] != UTIL_FORMAT_SWIZZLE_NONE;
 510 }
 511
 512 static INLINE boolean
 513 util_format_has_stencil(const struct util_format_description *desc)
 514 {
 515    return desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS &&
 516           desc->swizzle[1] != UTIL_FORMAT_SWIZZLE_NONE;
 517 }
 518
 519 static INLINE boolean
 520 util_format_is_depth_or_stencil(enum pipe_format format)
 521 {
 522    const struct util_format_description *desc = util_format_description(format);
 523
 524    assert(desc);
 525    if (!desc) {
 526       return FALSE;
 527    }
 528
 529    return util_format_has_depth(desc) ||
 530           util_format_has_stencil(desc);
 531 }
 532
 533 static INLINE boolean
 534 util_format_is_depth_and_stencil(enum pipe_format format)
 535 {
 536    const struct util_format_description *desc = util_format_description(format);
 537
 538    assert(desc);
 539    if (!desc) {
 540       return FALSE;
 541    }
 542
 543    return util_format_has_depth(desc) &&
 544           util_format_has_stencil(desc);
 545 }
 546
 547 /**
 548  * Return whether this is an RGBA, Z, S, or combined ZS format.
 549  * Useful for initializing pipe_blit_info::mask.
 550  */
 551 static INLINE unsigned
 552 util_format_get_mask(enum pipe_format format)
 553 {
 554    const struct util_format_description *desc =
 555       util_format_description(format);
 556
 557    if (!desc)
 558       return 0;
 559
 560    if (util_format_has_depth(desc)) {
 561       if (util_format_has_stencil(desc)) {
 562          return PIPE_MASK_ZS;
 563       } else {
 564          return PIPE_MASK_Z;
 565       }
 566    } else {
 567       if (util_format_has_stencil(desc)) {
 568          return PIPE_MASK_S;
 569       } else {
 570          return PIPE_MASK_RGBA;
 571       }
 572    }
 573 }
 574
 575 /**
 576  * Give the RGBA colormask of the channels that can be represented in this
 577  * format.
 578  *
 579  * That is, the channels whose values are preserved.
 580  */
 581 static INLINE unsigned
 582 util_format_colormask(const struct util_format_description *desc)
 583 {
 584    unsigned colormask;
 585    unsigned chan;
 586
 587    switch (desc->colorspace) {
 588    case UTIL_FORMAT_COLORSPACE_RGB:
 589    case UTIL_FORMAT_COLORSPACE_SRGB:
 590    case UTIL_FORMAT_COLORSPACE_YUV:
 591       colormask = 0;
 592       for (chan = 0; chan < 4; ++chan) {
 593          if (desc->swizzle[chan] < 4) {
 594             colormask |= (1 << chan);
 595          }
 596       }
 597       return colormask;
 598    case UTIL_FORMAT_COLORSPACE_ZS:
 599       return 0;
 600    default:
 601       assert(0);
 602       return 0;
 603    }
 604 }
 605
 606
 607 /**
 608  * Checks if color mask covers every channel for the specified format
 609  *
 610  * @param desc       a format description to check colormask with
 611  * @param colormask  a bit mask for channels, matches format of PIPE_MASK_RGBA
 612  */
 613 static INLINE boolean
 614 util_format_colormask_full(const struct util_format_description *desc, unsigned colormask)
 615 {
 616    return (~colormask & util_format_colormask(desc)) == 0;
 617 }
 618
 619
 620 boolean
 621 util_format_is_float(enum pipe_format format);
 622
 623
 624 boolean
 625 util_format_has_alpha(enum pipe_format format);
 626
 627
 628 boolean
 629 util_format_is_luminance(enum pipe_format format);
 630
 631
 632 boolean
 633 util_format_is_luminance_alpha(enum pipe_format format);
 634
 635
 636 boolean
 637 util_format_is_intensity(enum pipe_format format);
 638
 639 boolean
 640 util_format_is_pure_integer(enum pipe_format format);
 641
 642 boolean
 643 util_format_is_pure_sint(enum pipe_format format);
 644
 645 boolean
 646 util_format_is_pure_uint(enum pipe_format format);
 647
 648 /**
 649  * Check if the src format can be blitted to the destination format with
 650  * a simple memcpy.  For example, blitting from RGBA to RGBx is OK, but not
 651  * the reverse.
 652  */
 653 boolean
 654 util_is_format_compatible(const struct util_format_description *src_desc,
 655                           const struct util_format_description *dst_desc);
 656
 657 /**
 658  * Whether the format is supported by Gallium for the given bindings.
 659  * This covers S3TC textures and floating-point render targets.
 660  */
 661 boolean
 662 util_format_is_supported(enum pipe_format format, unsigned bind);
 663
 664 /**
 665  * Whether this format is a rgab8 variant.
 666  *
 667  * That is, any format that matches the
 668  *
 669  *   PIPE_FORMAT_?8?8?8?8_UNORM
 670  */
 671 static INLINE boolean
 672 util_format_is_rgba8_variant(const struct util_format_description *desc)
 673 {
 674    unsigned chan;
 675
 676    if(desc->block.width != 1 ||
 677       desc->block.height != 1 ||
 678       desc->block.bits != 32)
 679       return FALSE;
 680
 681    for(chan = 0; chan < 4; ++chan) {
 682       if(desc->channel[chan].type != UTIL_FORMAT_TYPE_UNSIGNED &&
 683          desc->channel[chan].type != UTIL_FORMAT_TYPE_VOID)
 684          return FALSE;
 685       if(desc->channel[chan].size != 8)
 686          return FALSE;
 687    }
 688
 689    return TRUE;
 690 }
 691
 692
 693 /**
 694  * Return total bits needed for the pixel format per block.
 695  */
 696 static INLINE uint
 697 util_format_get_blocksizebits(enum pipe_format format)
 698 {
 699    const struct util_format_description *desc = util_format_description(format);
 700
 701    assert(desc);
 702    if (!desc) {
 703       return 0;
 704    }
 705
 706    return desc->block.bits;
 707 }
 708
 709 /**
 710  * Return bytes per block (not pixel) for the given format.
 711  */
 712 static INLINE uint
 713 util_format_get_blocksize(enum pipe_format format)
 714 {
 715    uint bits = util_format_get_blocksizebits(format);
 716
 717    assert(bits % 8 == 0);
 718
 719    return bits / 8;
 720 }
 721
 722 static INLINE uint
 723 util_format_get_blockwidth(enum pipe_format format)
 724 {
 725    const struct util_format_description *desc = util_format_description(format);
 726
 727    assert(desc);
 728    if (!desc) {
 729       return 1;
 730    }
 731
 732    return desc->block.width;
 733 }
 734
 735 static INLINE uint
 736 util_format_get_blockheight(enum pipe_format format)
 737 {
 738    const struct util_format_description *desc = util_format_description(format);
 739
 740    assert(desc);
 741    if (!desc) {
 742       return 1;
 743    }
 744
 745    return desc->block.height;
 746 }
 747
 748 static INLINE unsigned
 749 util_format_get_nblocksx(enum pipe_format format,
 750                          unsigned x)
 751 {
 752    unsigned blockwidth = util_format_get_blockwidth(format);
 753    return (x + blockwidth - 1) / blockwidth;
 754 }
 755
 756 static INLINE unsigned
 757 util_format_get_nblocksy(enum pipe_format format,
 758                          unsigned y)
 759 {
 760    unsigned blockheight = util_format_get_blockheight(format);
 761    return (y + blockheight - 1) / blockheight;
 762 }
 763
 764 static INLINE unsigned
 765 util_format_get_nblocks(enum pipe_format format,
 766                         unsigned width,
 767                         unsigned height)
 768 {
 769    return util_format_get_nblocksx(format, width) * util_format_get_nblocksy(format, height);
 770 }
 771
 772 static INLINE size_t
 773 util_format_get_stride(enum pipe_format format,
 774                        unsigned width)
 775 {
 776    return util_format_get_nblocksx(format, width) * util_format_get_blocksize(format);
 777 }
 778
 779 static INLINE size_t
 780 util_format_get_2d_size(enum pipe_format format,
 781                         size_t stride,
 782                         unsigned height)
 783 {
 784    return util_format_get_nblocksy(format, height) * stride;
 785 }
 786
 787 static INLINE uint
 788 util_format_get_component_bits(enum pipe_format format,
 789                                enum util_format_colorspace colorspace,
 790                                uint component)
 791 {
 792    const struct util_format_description *desc = util_format_description(format);
 793    enum util_format_colorspace desc_colorspace;
 794
 795    assert(format);
 796    if (!format) {
 797       return 0;
 798    }
 799
 800    assert(component < 4);
 801
 802    /* Treat RGB and SRGB as equivalent. */
 803    if (colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 804       colorspace = UTIL_FORMAT_COLORSPACE_RGB;
 805    }
 806    if (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 807       desc_colorspace = UTIL_FORMAT_COLORSPACE_RGB;
 808    } else {
 809       desc_colorspace = desc->colorspace;
 810    }
 811
 812    if (desc_colorspace != colorspace) {
 813       return 0;
 814    }
 815
 816    switch (desc->swizzle[component]) {
 817    case UTIL_FORMAT_SWIZZLE_X:
 818       return desc->channel[0].size;
 819    case UTIL_FORMAT_SWIZZLE_Y:
 820       return desc->channel[1].size;
 821    case UTIL_FORMAT_SWIZZLE_Z:
 822       return desc->channel[2].size;
 823    case UTIL_FORMAT_SWIZZLE_W:
 824       return desc->channel[3].size;
 825    default:
 826       return 0;
 827    }
 828 }
 829
 830 /**
 831  * Given a linear RGB colorspace format, return the corresponding SRGB
 832  * format, or PIPE_FORMAT_NONE if none.
 833  */
 834 static INLINE enum pipe_format
 835 util_format_srgb(enum pipe_format format)
 836 {
 837    switch (format) {
 838    case PIPE_FORMAT_L8_UNORM:
 839       return PIPE_FORMAT_L8_SRGB;
 840    case PIPE_FORMAT_L8A8_UNORM:
 841       return PIPE_FORMAT_L8A8_SRGB;
 842    case PIPE_FORMAT_R8G8B8_UNORM:
 843       return PIPE_FORMAT_R8G8B8_SRGB;
 844    case PIPE_FORMAT_A8B8G8R8_UNORM:
 845       return PIPE_FORMAT_A8B8G8R8_SRGB;
 846    case PIPE_FORMAT_X8B8G8R8_UNORM:
 847       return PIPE_FORMAT_X8B8G8R8_SRGB;
 848    case PIPE_FORMAT_B8G8R8A8_UNORM:
 849       return PIPE_FORMAT_B8G8R8A8_SRGB;
 850    case PIPE_FORMAT_B8G8R8X8_UNORM:
 851       return PIPE_FORMAT_B8G8R8X8_SRGB;
 852    case PIPE_FORMAT_A8R8G8B8_UNORM:
 853       return PIPE_FORMAT_A8R8G8B8_SRGB;
 854    case PIPE_FORMAT_X8R8G8B8_UNORM:
 855       return PIPE_FORMAT_X8R8G8B8_SRGB;
 856    case PIPE_FORMAT_R8G8B8A8_UNORM:
 857       return PIPE_FORMAT_R8G8B8A8_SRGB;
 858    case PIPE_FORMAT_R8G8B8X8_UNORM:
 859       return PIPE_FORMAT_R8G8B8X8_SRGB;
 860    case PIPE_FORMAT_DXT1_RGB:
 861       return PIPE_FORMAT_DXT1_SRGB;
 862    case PIPE_FORMAT_DXT1_RGBA:
 863       return PIPE_FORMAT_DXT1_SRGBA;
 864    case PIPE_FORMAT_DXT3_RGBA:
 865       return PIPE_FORMAT_DXT3_SRGBA;
 866    case PIPE_FORMAT_DXT5_RGBA:
 867       return PIPE_FORMAT_DXT5_SRGBA;
 868    default:
 869       return PIPE_FORMAT_NONE;
 870    }
 871 }
 872
 873 /**
 874  * Given an sRGB format, return the corresponding linear colorspace format.
 875  * For non sRGB formats, return the format unchanged.
 876  */
 877 static INLINE enum pipe_format
 878 util_format_linear(enum pipe_format format)
 879 {
 880    switch (format) {
 881    case PIPE_FORMAT_L8_SRGB:
 882       return PIPE_FORMAT_L8_UNORM;
 883    case PIPE_FORMAT_L8A8_SRGB:
 884       return PIPE_FORMAT_L8A8_UNORM;
 885    case PIPE_FORMAT_R8G8B8_SRGB:
 886       return PIPE_FORMAT_R8G8B8_UNORM;
 887    case PIPE_FORMAT_A8B8G8R8_SRGB:
 888       return PIPE_FORMAT_A8B8G8R8_UNORM;
 889    case PIPE_FORMAT_X8B8G8R8_SRGB:
 890       return PIPE_FORMAT_X8B8G8R8_UNORM;
 891    case PIPE_FORMAT_B8G8R8A8_SRGB:
 892       return PIPE_FORMAT_B8G8R8A8_UNORM;
 893    case PIPE_FORMAT_B8G8R8X8_SRGB:
 894       return PIPE_FORMAT_B8G8R8X8_UNORM;
 895    case PIPE_FORMAT_A8R8G8B8_SRGB:
 896       return PIPE_FORMAT_A8R8G8B8_UNORM;
 897    case PIPE_FORMAT_X8R8G8B8_SRGB:
 898       return PIPE_FORMAT_X8R8G8B8_UNORM;
 899    case PIPE_FORMAT_R8G8B8A8_SRGB:
 900       return PIPE_FORMAT_R8G8B8A8_UNORM;
 901    case PIPE_FORMAT_R8G8B8X8_SRGB:
 902       return PIPE_FORMAT_R8G8B8X8_UNORM;
 903    case PIPE_FORMAT_DXT1_SRGB:
 904       return PIPE_FORMAT_DXT1_RGB;
 905    case PIPE_FORMAT_DXT1_SRGBA:
 906       return PIPE_FORMAT_DXT1_RGBA;
 907    case PIPE_FORMAT_DXT3_SRGBA:
 908       return PIPE_FORMAT_DXT3_RGBA;
 909    case PIPE_FORMAT_DXT5_SRGBA:
 910       return PIPE_FORMAT_DXT5_RGBA;
 911    default:
 912       return format;
 913    }
 914 }
 915
 916 /**
 917  * Given a depth-stencil format, return the corresponding stencil-only format.
 918  * For stencil-only formats, return the format unchanged.
 919  */
 920 static INLINE enum pipe_format
 921 util_format_stencil_only(enum pipe_format format)
 922 {
 923    switch (format) {
 924    /* mask out the depth component */
 925    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 926       return PIPE_FORMAT_X24S8_UINT;
 927    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 928       return PIPE_FORMAT_S8X24_UINT;
 929    case PIPE_FORMAT_Z32_FLOAT_S8X24_UINT:
 930       return PIPE_FORMAT_X32_S8X24_UINT;
 931
 932    /* stencil only formats */
 933    case PIPE_FORMAT_X24S8_UINT:
 934    case PIPE_FORMAT_S8X24_UINT:
 935    case PIPE_FORMAT_X32_S8X24_UINT:
 936    case PIPE_FORMAT_S8_UINT:
 937       return format;
 938
 939    default:
 940       assert(0);
 941       return PIPE_FORMAT_NONE;
 942    }
 943 }
 944
 945 /**
 946  * Converts PIPE_FORMAT_*I* to PIPE_FORMAT_*R*.
 947  * This is identity for non-intensity formats.
 948  */
 949 static INLINE enum pipe_format
 950 util_format_intensity_to_red(enum pipe_format format)
 951 {
 952    switch (format) {
 953    case PIPE_FORMAT_I8_UNORM:
 954       return PIPE_FORMAT_R8_UNORM;
 955    case PIPE_FORMAT_I8_SNORM:
 956       return PIPE_FORMAT_R8_SNORM;
 957    case PIPE_FORMAT_I16_UNORM:
 958       return PIPE_FORMAT_R16_UNORM;
 959    case PIPE_FORMAT_I16_SNORM:
 960       return PIPE_FORMAT_R16_SNORM;
 961    case PIPE_FORMAT_I16_FLOAT:
 962       return PIPE_FORMAT_R16_FLOAT;
 963    case PIPE_FORMAT_I32_FLOAT:
 964       return PIPE_FORMAT_R32_FLOAT;
 965    case PIPE_FORMAT_I8_UINT:
 966       return PIPE_FORMAT_R8_UINT;
 967    case PIPE_FORMAT_I8_SINT:
 968       return PIPE_FORMAT_R8_SINT;
 969    case PIPE_FORMAT_I16_UINT:
 970       return PIPE_FORMAT_R16_UINT;
 971    case PIPE_FORMAT_I16_SINT:
 972       return PIPE_FORMAT_R16_SINT;
 973    case PIPE_FORMAT_I32_UINT:
 974       return PIPE_FORMAT_R32_UINT;
 975    case PIPE_FORMAT_I32_SINT:
 976       return PIPE_FORMAT_R32_SINT;
 977    default:
 978       assert(!util_format_is_intensity(format));
 979       return format;
 980    }
 981 }
 982
 983 /**
 984  * Converts PIPE_FORMAT_*L* to PIPE_FORMAT_*R*.
 985  * This is identity for non-luminance formats.
 986  */
 987 static INLINE enum pipe_format
 988 util_format_luminance_to_red(enum pipe_format format)
 989 {
 990    switch (format) {
 991    case PIPE_FORMAT_L8_UNORM:
 992       return PIPE_FORMAT_R8_UNORM;
 993    case PIPE_FORMAT_L8_SNORM:
 994       return PIPE_FORMAT_R8_SNORM;
 995    case PIPE_FORMAT_L16_UNORM:
 996       return PIPE_FORMAT_R16_UNORM;
 997    case PIPE_FORMAT_L16_SNORM:
 998       return PIPE_FORMAT_R16_SNORM;
 999    case PIPE_FORMAT_L16_FLOAT:
1000       return PIPE_FORMAT_R16_FLOAT;
1001    case PIPE_FORMAT_L32_FLOAT:
1002       return PIPE_FORMAT_R32_FLOAT;
1003    case PIPE_FORMAT_L8_UINT:
1004       return PIPE_FORMAT_R8_UINT;
1005    case PIPE_FORMAT_L8_SINT:
1006       return PIPE_FORMAT_R8_SINT;
1007    case PIPE_FORMAT_L16_UINT:
1008       return PIPE_FORMAT_R16_UINT;
1009    case PIPE_FORMAT_L16_SINT:
1010       return PIPE_FORMAT_R16_SINT;
1011    case PIPE_FORMAT_L32_UINT:
1012       return PIPE_FORMAT_R32_UINT;
1013    case PIPE_FORMAT_L32_SINT:
1014       return PIPE_FORMAT_R32_SINT;
1015
1016    case PIPE_FORMAT_LATC1_UNORM:
1017       return PIPE_FORMAT_RGTC1_UNORM;
1018    case PIPE_FORMAT_LATC1_SNORM:
1019       return PIPE_FORMAT_RGTC1_SNORM;
1020
1021    case PIPE_FORMAT_L4A4_UNORM:
1022       /* XXX A4R4 is defined as x00y in u_format.csv */
1023       return PIPE_FORMAT_A4R4_UNORM;
1024
1025    case PIPE_FORMAT_L8A8_UNORM:
1026       return PIPE_FORMAT_R8A8_UNORM;
1027    case PIPE_FORMAT_L8A8_SNORM:
1028       return PIPE_FORMAT_R8A8_SNORM;
1029    case PIPE_FORMAT_L16A16_UNORM:
1030       return PIPE_FORMAT_R16A16_UNORM;
1031    case PIPE_FORMAT_L16A16_SNORM:
1032       return PIPE_FORMAT_R16A16_SNORM;
1033    case PIPE_FORMAT_L16A16_FLOAT:
1034       return PIPE_FORMAT_R16A16_FLOAT;
1035    case PIPE_FORMAT_L32A32_FLOAT:
1036       return PIPE_FORMAT_R32A32_FLOAT;
1037    case PIPE_FORMAT_L8A8_UINT:
1038       return PIPE_FORMAT_R8A8_UINT;
1039    case PIPE_FORMAT_L8A8_SINT:
1040       return PIPE_FORMAT_R8A8_SINT;
1041    case PIPE_FORMAT_L16A16_UINT:
1042       return PIPE_FORMAT_R16A16_UINT;
1043    case PIPE_FORMAT_L16A16_SINT:
1044       return PIPE_FORMAT_R16A16_SINT;
1045    case PIPE_FORMAT_L32A32_UINT:
1046       return PIPE_FORMAT_R32A32_UINT;
1047    case PIPE_FORMAT_L32A32_SINT:
1048       return PIPE_FORMAT_R32A32_SINT;
1049
1050    /* We don't have compressed red-alpha variants for these. */
1051    case PIPE_FORMAT_LATC2_UNORM:
1052    case PIPE_FORMAT_LATC2_SNORM:
1053       return PIPE_FORMAT_NONE;
1054
1055    default:
1056       assert(!util_format_is_luminance(format) &&
1057              !util_format_is_luminance_alpha(format));
1058       return format;
1059    }
1060 }
1061
1062 /**
1063  * Return the number of components stored.
1064  * Formats with block size != 1x1 will always have 1 component (the block).
1065  */
1066 static INLINE unsigned
1067 util_format_get_nr_components(enum pipe_format format)
1068 {
1069    const struct util_format_description *desc = util_format_description(format);
1070    return desc->nr_channels;
1071 }
1072
1073 /**
1074  * Return the index of the first non-void channel
1075  * -1 if no non-void channels
1076  */
1077 static INLINE int
1078 util_format_get_first_non_void_channel(enum pipe_format format)
1079 {
1080    const struct util_format_description *desc = util_format_description(format);
1081    int i;
1082
1083    for (i = 0; i < 4; i++)
1084       if (desc->channel[i].type != UTIL_FORMAT_TYPE_VOID)
1085          break;
1086
1087    if (i == 4)
1088        return -1;
1089
1090    return i;
1091 }
1092
1093 /*
1094  * Format access functions.
1095  */
1096
1097 void
1098 util_format_read_4f(enum pipe_format format,
1099                     float *dst, unsigned dst_stride,
1100                     const void *src, unsigned src_stride,
1101                     unsigned x, unsigned y, unsigned w, unsigned h);
1102
1103 void
1104 util_format_write_4f(enum pipe_format format,
1105                      const float *src, unsigned src_stride,
1106                      void *dst, unsigned dst_stride,
1107                      unsigned x, unsigned y, unsigned w, unsigned h);
1108
1109 void
1110 util_format_read_4ub(enum pipe_format format,
1111                      uint8_t *dst, unsigned dst_stride,
1112                      const void *src, unsigned src_stride,
1113                      unsigned x, unsigned y, unsigned w, unsigned h);
1114
1115 void
1116 util_format_write_4ub(enum pipe_format format,
1117                       const uint8_t *src, unsigned src_stride,
1118                       void *dst, unsigned dst_stride,
1119                       unsigned x, unsigned y, unsigned w, unsigned h);
1120
1121 void
1122 util_format_read_4ui(enum pipe_format format,
1123                      unsigned *dst, unsigned dst_stride,
1124                      const void *src, unsigned src_stride,
1125                      unsigned x, unsigned y, unsigned w, unsigned h);
1126
1127 void
1128 util_format_write_4ui(enum pipe_format format,
1129                       const unsigned int *src, unsigned src_stride,
1130                       void *dst, unsigned dst_stride,
1131                       unsigned x, unsigned y, unsigned w, unsigned h);
1132
1133 void
1134 util_format_read_4i(enum pipe_format format,
1135                     int *dst, unsigned dst_stride,
1136                     const void *src, unsigned src_stride,
1137                     unsigned x, unsigned y, unsigned w, unsigned h);
1138
1139 void
1140 util_format_write_4i(enum pipe_format format,
1141                      const int *src, unsigned src_stride,
1142                      void *dst, unsigned dst_stride,
1143                      unsigned x, unsigned y, unsigned w, unsigned h);
1144
1145 /*
1146  * Generic format conversion;
1147  */
1148
1149 boolean
1150 util_format_fits_8unorm(const struct util_format_description *format_desc);
1151
1152 void
1153 util_format_translate(enum pipe_format dst_format,
1154                       void *dst, unsigned dst_stride,
1155                       unsigned dst_x, unsigned dst_y,
1156                       enum pipe_format src_format,
1157                       const void *src, unsigned src_stride,
1158                       unsigned src_x, unsigned src_y,
1159                       unsigned width, unsigned height);
1160
1161 /*
1162  * Swizzle operations.
1163  */
1164
1165 /* Compose two sets of swizzles.
1166  * If V is a 4D vector and the function parameters represent functions that
1167  * swizzle vector components, this holds:
1168  *     swz2(swz1(V)) = dst(V)
1169  */
1170 void util_format_compose_swizzles(const unsigned char swz1[4],
1171                                   const unsigned char swz2[4],
1172                                   unsigned char dst[4]);
1173
1174 /* Apply the swizzle provided in \param swz (which is one of PIPE_SWIZZLE_x)
1175  * to \param src and store the result in \param dst.
1176  * \param is_integer determines the value written for PIPE_SWIZZLE_ONE.
1177  */
1178 void util_format_apply_color_swizzle(union pipe_color_union *dst,
1179                                      const union pipe_color_union *src,
1180                                      const unsigned char swz[4],
1181                                      const boolean is_integer);
1182
1183 void util_format_swizzle_4f(float *dst, const float *src,
1184                             const unsigned char swz[4]);
1185
1186 void util_format_unswizzle_4f(float *dst, const float *src,
1187                               const unsigned char swz[4]);
1188
1189 #ifdef __cplusplus
1190 } // extern "C" {
1191 #endif
1192
1193 #endif /* ! U_FORMAT_H */