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)(uint32_t *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 uint32_t *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)(int32_t *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 int32_t *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 /**
 549  * Calculates the depth format type based upon the incoming format description.
 550  */
 551 static INLINE unsigned
 552 util_get_depth_format_type(const struct util_format_description *desc)
 553 {
 554    unsigned depth_channel = desc->swizzle[0];
 555    if (desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS &&
 556        depth_channel != UTIL_FORMAT_SWIZZLE_NONE) {
 557       return desc->channel[depth_channel].type;
 558    } else {
 559       return UTIL_FORMAT_TYPE_VOID;
 560    }
 561 }
 562
 563
 564 /**
 565  * Calculates the MRD for the depth format. MRD is used in depth bias
 566  * for UNORM and unbound depth buffers. When the depth buffer is floating
 567  * point, the depth bias calculation does not use the MRD. However, the
 568  * default MRD will be 1.0 / ((1 << 24) - 1).
 569  */
 570 double
 571 util_get_depth_format_mrd(const struct util_format_description *desc);
 572
 573
 574 /**
 575  * Return whether this is an RGBA, Z, S, or combined ZS format.
 576  * Useful for initializing pipe_blit_info::mask.
 577  */
 578 static INLINE unsigned
 579 util_format_get_mask(enum pipe_format format)
 580 {
 581    const struct util_format_description *desc =
 582       util_format_description(format);
 583
 584    if (!desc)
 585       return 0;
 586
 587    if (util_format_has_depth(desc)) {
 588       if (util_format_has_stencil(desc)) {
 589          return PIPE_MASK_ZS;
 590       } else {
 591          return PIPE_MASK_Z;
 592       }
 593    } else {
 594       if (util_format_has_stencil(desc)) {
 595          return PIPE_MASK_S;
 596       } else {
 597          return PIPE_MASK_RGBA;
 598       }
 599    }
 600 }
 601
 602 /**
 603  * Give the RGBA colormask of the channels that can be represented in this
 604  * format.
 605  *
 606  * That is, the channels whose values are preserved.
 607  */
 608 static INLINE unsigned
 609 util_format_colormask(const struct util_format_description *desc)
 610 {
 611    unsigned colormask;
 612    unsigned chan;
 613
 614    switch (desc->colorspace) {
 615    case UTIL_FORMAT_COLORSPACE_RGB:
 616    case UTIL_FORMAT_COLORSPACE_SRGB:
 617    case UTIL_FORMAT_COLORSPACE_YUV:
 618       colormask = 0;
 619       for (chan = 0; chan < 4; ++chan) {
 620          if (desc->swizzle[chan] < 4) {
 621             colormask |= (1 << chan);
 622          }
 623       }
 624       return colormask;
 625    case UTIL_FORMAT_COLORSPACE_ZS:
 626       return 0;
 627    default:
 628       assert(0);
 629       return 0;
 630    }
 631 }
 632
 633
 634 /**
 635  * Checks if color mask covers every channel for the specified format
 636  *
 637  * @param desc       a format description to check colormask with
 638  * @param colormask  a bit mask for channels, matches format of PIPE_MASK_RGBA
 639  */
 640 static INLINE boolean
 641 util_format_colormask_full(const struct util_format_description *desc, unsigned colormask)
 642 {
 643    return (~colormask & util_format_colormask(desc)) == 0;
 644 }
 645
 646
 647 boolean
 648 util_format_is_float(enum pipe_format format);
 649
 650
 651 boolean
 652 util_format_has_alpha(enum pipe_format format);
 653
 654
 655 boolean
 656 util_format_is_luminance(enum pipe_format format);
 657
 658
 659 boolean
 660 util_format_is_luminance_alpha(enum pipe_format format);
 661
 662
 663 boolean
 664 util_format_is_intensity(enum pipe_format format);
 665
 666 boolean
 667 util_format_is_pure_integer(enum pipe_format format);
 668
 669 boolean
 670 util_format_is_pure_sint(enum pipe_format format);
 671
 672 boolean
 673 util_format_is_pure_uint(enum pipe_format format);
 674
 675 boolean
 676 util_format_is_snorm(enum pipe_format format);
 677
 678 /**
 679  * Check if the src format can be blitted to the destination format with
 680  * a simple memcpy.  For example, blitting from RGBA to RGBx is OK, but not
 681  * the reverse.
 682  */
 683 boolean
 684 util_is_format_compatible(const struct util_format_description *src_desc,
 685                           const struct util_format_description *dst_desc);
 686
 687 /**
 688  * Whether the format is supported by Gallium for the given bindings.
 689  * This covers S3TC textures and floating-point render targets.
 690  */
 691 boolean
 692 util_format_is_supported(enum pipe_format format, unsigned bind);
 693
 694 /**
 695  * Whether this format is a rgab8 variant.
 696  *
 697  * That is, any format that matches the
 698  *
 699  *   PIPE_FORMAT_?8?8?8?8_UNORM
 700  */
 701 static INLINE boolean
 702 util_format_is_rgba8_variant(const struct util_format_description *desc)
 703 {
 704    unsigned chan;
 705
 706    if(desc->block.width != 1 ||
 707       desc->block.height != 1 ||
 708       desc->block.bits != 32)
 709       return FALSE;
 710
 711    for(chan = 0; chan < 4; ++chan) {
 712       if(desc->channel[chan].type != UTIL_FORMAT_TYPE_UNSIGNED &&
 713          desc->channel[chan].type != UTIL_FORMAT_TYPE_VOID)
 714          return FALSE;
 715       if(desc->channel[chan].type == UTIL_FORMAT_TYPE_UNSIGNED &&
 716          !desc->channel[chan].normalized)
 717          return FALSE;
 718       if(desc->channel[chan].size != 8)
 719          return FALSE;
 720    }
 721
 722    return TRUE;
 723 }
 724
 725
 726 /**
 727  * Return total bits needed for the pixel format per block.
 728  */
 729 static INLINE uint
 730 util_format_get_blocksizebits(enum pipe_format format)
 731 {
 732    const struct util_format_description *desc = util_format_description(format);
 733
 734    assert(desc);
 735    if (!desc) {
 736       return 0;
 737    }
 738
 739    return desc->block.bits;
 740 }
 741
 742 /**
 743  * Return bytes per block (not pixel) for the given format.
 744  */
 745 static INLINE uint
 746 util_format_get_blocksize(enum pipe_format format)
 747 {
 748    uint bits = util_format_get_blocksizebits(format);
 749    uint bytes = bits / 8;
 750
 751    assert(bits % 8 == 0);
 752    assert(bytes > 0);
 753    if (bytes == 0) {
 754       bytes = 1;
 755    }
 756
 757    return bytes;
 758 }
 759
 760 static INLINE uint
 761 util_format_get_blockwidth(enum pipe_format format)
 762 {
 763    const struct util_format_description *desc = util_format_description(format);
 764
 765    assert(desc);
 766    if (!desc) {
 767       return 1;
 768    }
 769
 770    return desc->block.width;
 771 }
 772
 773 static INLINE uint
 774 util_format_get_blockheight(enum pipe_format format)
 775 {
 776    const struct util_format_description *desc = util_format_description(format);
 777
 778    assert(desc);
 779    if (!desc) {
 780       return 1;
 781    }
 782
 783    return desc->block.height;
 784 }
 785
 786 static INLINE unsigned
 787 util_format_get_nblocksx(enum pipe_format format,
 788                          unsigned x)
 789 {
 790    unsigned blockwidth = util_format_get_blockwidth(format);
 791    return (x + blockwidth - 1) / blockwidth;
 792 }
 793
 794 static INLINE unsigned
 795 util_format_get_nblocksy(enum pipe_format format,
 796                          unsigned y)
 797 {
 798    unsigned blockheight = util_format_get_blockheight(format);
 799    return (y + blockheight - 1) / blockheight;
 800 }
 801
 802 static INLINE unsigned
 803 util_format_get_nblocks(enum pipe_format format,
 804                         unsigned width,
 805                         unsigned height)
 806 {
 807    return util_format_get_nblocksx(format, width) * util_format_get_nblocksy(format, height);
 808 }
 809
 810 static INLINE size_t
 811 util_format_get_stride(enum pipe_format format,
 812                        unsigned width)
 813 {
 814    return util_format_get_nblocksx(format, width) * util_format_get_blocksize(format);
 815 }
 816
 817 static INLINE size_t
 818 util_format_get_2d_size(enum pipe_format format,
 819                         size_t stride,
 820                         unsigned height)
 821 {
 822    return util_format_get_nblocksy(format, height) * stride;
 823 }
 824
 825 static INLINE uint
 826 util_format_get_component_bits(enum pipe_format format,
 827                                enum util_format_colorspace colorspace,
 828                                uint component)
 829 {
 830    const struct util_format_description *desc = util_format_description(format);
 831    enum util_format_colorspace desc_colorspace;
 832
 833    assert(format);
 834    if (!format) {
 835       return 0;
 836    }
 837
 838    assert(component < 4);
 839
 840    /* Treat RGB and SRGB as equivalent. */
 841    if (colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 842       colorspace = UTIL_FORMAT_COLORSPACE_RGB;
 843    }
 844    if (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 845       desc_colorspace = UTIL_FORMAT_COLORSPACE_RGB;
 846    } else {
 847       desc_colorspace = desc->colorspace;
 848    }
 849
 850    if (desc_colorspace != colorspace) {
 851       return 0;
 852    }
 853
 854    switch (desc->swizzle[component]) {
 855    case UTIL_FORMAT_SWIZZLE_X:
 856       return desc->channel[0].size;
 857    case UTIL_FORMAT_SWIZZLE_Y:
 858       return desc->channel[1].size;
 859    case UTIL_FORMAT_SWIZZLE_Z:
 860       return desc->channel[2].size;
 861    case UTIL_FORMAT_SWIZZLE_W:
 862       return desc->channel[3].size;
 863    default:
 864       return 0;
 865    }
 866 }
 867
 868 /**
 869  * Given a linear RGB colorspace format, return the corresponding SRGB
 870  * format, or PIPE_FORMAT_NONE if none.
 871  */
 872 static INLINE enum pipe_format
 873 util_format_srgb(enum pipe_format format)
 874 {
 875    if (util_format_is_srgb(format))
 876       return format;
 877
 878    switch (format) {
 879    case PIPE_FORMAT_L8_UNORM:
 880       return PIPE_FORMAT_L8_SRGB;
 881    case PIPE_FORMAT_L8A8_UNORM:
 882       return PIPE_FORMAT_L8A8_SRGB;
 883    case PIPE_FORMAT_R8G8B8_UNORM:
 884       return PIPE_FORMAT_R8G8B8_SRGB;
 885    case PIPE_FORMAT_A8B8G8R8_UNORM:
 886       return PIPE_FORMAT_A8B8G8R8_SRGB;
 887    case PIPE_FORMAT_X8B8G8R8_UNORM:
 888       return PIPE_FORMAT_X8B8G8R8_SRGB;
 889    case PIPE_FORMAT_B8G8R8A8_UNORM:
 890       return PIPE_FORMAT_B8G8R8A8_SRGB;
 891    case PIPE_FORMAT_B8G8R8X8_UNORM:
 892       return PIPE_FORMAT_B8G8R8X8_SRGB;
 893    case PIPE_FORMAT_A8R8G8B8_UNORM:
 894       return PIPE_FORMAT_A8R8G8B8_SRGB;
 895    case PIPE_FORMAT_X8R8G8B8_UNORM:
 896       return PIPE_FORMAT_X8R8G8B8_SRGB;
 897    case PIPE_FORMAT_R8G8B8A8_UNORM:
 898       return PIPE_FORMAT_R8G8B8A8_SRGB;
 899    case PIPE_FORMAT_R8G8B8X8_UNORM:
 900       return PIPE_FORMAT_R8G8B8X8_SRGB;
 901    case PIPE_FORMAT_DXT1_RGB:
 902       return PIPE_FORMAT_DXT1_SRGB;
 903    case PIPE_FORMAT_DXT1_RGBA:
 904       return PIPE_FORMAT_DXT1_SRGBA;
 905    case PIPE_FORMAT_DXT3_RGBA:
 906       return PIPE_FORMAT_DXT3_SRGBA;
 907    case PIPE_FORMAT_DXT5_RGBA:
 908       return PIPE_FORMAT_DXT5_SRGBA;
 909    default:
 910       return PIPE_FORMAT_NONE;
 911    }
 912 }
 913
 914 /**
 915  * Given an sRGB format, return the corresponding linear colorspace format.
 916  * For non sRGB formats, return the format unchanged.
 917  */
 918 static INLINE enum pipe_format
 919 util_format_linear(enum pipe_format format)
 920 {
 921    switch (format) {
 922    case PIPE_FORMAT_L8_SRGB:
 923       return PIPE_FORMAT_L8_UNORM;
 924    case PIPE_FORMAT_L8A8_SRGB:
 925       return PIPE_FORMAT_L8A8_UNORM;
 926    case PIPE_FORMAT_R8G8B8_SRGB:
 927       return PIPE_FORMAT_R8G8B8_UNORM;
 928    case PIPE_FORMAT_A8B8G8R8_SRGB:
 929       return PIPE_FORMAT_A8B8G8R8_UNORM;
 930    case PIPE_FORMAT_X8B8G8R8_SRGB:
 931       return PIPE_FORMAT_X8B8G8R8_UNORM;
 932    case PIPE_FORMAT_B8G8R8A8_SRGB:
 933       return PIPE_FORMAT_B8G8R8A8_UNORM;
 934    case PIPE_FORMAT_B8G8R8X8_SRGB:
 935       return PIPE_FORMAT_B8G8R8X8_UNORM;
 936    case PIPE_FORMAT_A8R8G8B8_SRGB:
 937       return PIPE_FORMAT_A8R8G8B8_UNORM;
 938    case PIPE_FORMAT_X8R8G8B8_SRGB:
 939       return PIPE_FORMAT_X8R8G8B8_UNORM;
 940    case PIPE_FORMAT_R8G8B8A8_SRGB:
 941       return PIPE_FORMAT_R8G8B8A8_UNORM;
 942    case PIPE_FORMAT_R8G8B8X8_SRGB:
 943       return PIPE_FORMAT_R8G8B8X8_UNORM;
 944    case PIPE_FORMAT_DXT1_SRGB:
 945       return PIPE_FORMAT_DXT1_RGB;
 946    case PIPE_FORMAT_DXT1_SRGBA:
 947       return PIPE_FORMAT_DXT1_RGBA;
 948    case PIPE_FORMAT_DXT3_SRGBA:
 949       return PIPE_FORMAT_DXT3_RGBA;
 950    case PIPE_FORMAT_DXT5_SRGBA:
 951       return PIPE_FORMAT_DXT5_RGBA;
 952    default:
 953       return format;
 954    }
 955 }
 956
 957 /**
 958  * Given a depth-stencil format, return the corresponding stencil-only format.
 959  * For stencil-only formats, return the format unchanged.
 960  */
 961 static INLINE enum pipe_format
 962 util_format_stencil_only(enum pipe_format format)
 963 {
 964    switch (format) {
 965    /* mask out the depth component */
 966    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
 967       return PIPE_FORMAT_X24S8_UINT;
 968    case PIPE_FORMAT_S8_UINT_Z24_UNORM:
 969       return PIPE_FORMAT_S8X24_UINT;
 970    case PIPE_FORMAT_Z32_FLOAT_S8X24_UINT:
 971       return PIPE_FORMAT_X32_S8X24_UINT;
 972
 973    /* stencil only formats */
 974    case PIPE_FORMAT_X24S8_UINT:
 975    case PIPE_FORMAT_S8X24_UINT:
 976    case PIPE_FORMAT_X32_S8X24_UINT:
 977    case PIPE_FORMAT_S8_UINT:
 978       return format;
 979
 980    default:
 981       assert(0);
 982       return PIPE_FORMAT_NONE;
 983    }
 984 }
 985
 986 /**
 987  * Converts PIPE_FORMAT_*I* to PIPE_FORMAT_*R*.
 988  * This is identity for non-intensity formats.
 989  */
 990 static INLINE enum pipe_format
 991 util_format_intensity_to_red(enum pipe_format format)
 992 {
 993    switch (format) {
 994    case PIPE_FORMAT_I8_UNORM:
 995       return PIPE_FORMAT_R8_UNORM;
 996    case PIPE_FORMAT_I8_SNORM:
 997       return PIPE_FORMAT_R8_SNORM;
 998    case PIPE_FORMAT_I16_UNORM:
 999       return PIPE_FORMAT_R16_UNORM;
1000    case PIPE_FORMAT_I16_SNORM:
1001       return PIPE_FORMAT_R16_SNORM;
1002    case PIPE_FORMAT_I16_FLOAT:
1003       return PIPE_FORMAT_R16_FLOAT;
1004    case PIPE_FORMAT_I32_FLOAT:
1005       return PIPE_FORMAT_R32_FLOAT;
1006    case PIPE_FORMAT_I8_UINT:
1007       return PIPE_FORMAT_R8_UINT;
1008    case PIPE_FORMAT_I8_SINT:
1009       return PIPE_FORMAT_R8_SINT;
1010    case PIPE_FORMAT_I16_UINT:
1011       return PIPE_FORMAT_R16_UINT;
1012    case PIPE_FORMAT_I16_SINT:
1013       return PIPE_FORMAT_R16_SINT;
1014    case PIPE_FORMAT_I32_UINT:
1015       return PIPE_FORMAT_R32_UINT;
1016    case PIPE_FORMAT_I32_SINT:
1017       return PIPE_FORMAT_R32_SINT;
1018    default:
1019       assert(!util_format_is_intensity(format));
1020       return format;
1021    }
1022 }
1023
1024 /**
1025  * Converts PIPE_FORMAT_*L* to PIPE_FORMAT_*R*.
1026  * This is identity for non-luminance formats.
1027  */
1028 static INLINE enum pipe_format
1029 util_format_luminance_to_red(enum pipe_format format)
1030 {
1031    switch (format) {
1032    case PIPE_FORMAT_L8_UNORM:
1033       return PIPE_FORMAT_R8_UNORM;
1034    case PIPE_FORMAT_L8_SNORM:
1035       return PIPE_FORMAT_R8_SNORM;
1036    case PIPE_FORMAT_L16_UNORM:
1037       return PIPE_FORMAT_R16_UNORM;
1038    case PIPE_FORMAT_L16_SNORM:
1039       return PIPE_FORMAT_R16_SNORM;
1040    case PIPE_FORMAT_L16_FLOAT:
1041       return PIPE_FORMAT_R16_FLOAT;
1042    case PIPE_FORMAT_L32_FLOAT:
1043       return PIPE_FORMAT_R32_FLOAT;
1044    case PIPE_FORMAT_L8_UINT:
1045       return PIPE_FORMAT_R8_UINT;
1046    case PIPE_FORMAT_L8_SINT:
1047       return PIPE_FORMAT_R8_SINT;
1048    case PIPE_FORMAT_L16_UINT:
1049       return PIPE_FORMAT_R16_UINT;
1050    case PIPE_FORMAT_L16_SINT:
1051       return PIPE_FORMAT_R16_SINT;
1052    case PIPE_FORMAT_L32_UINT:
1053       return PIPE_FORMAT_R32_UINT;
1054    case PIPE_FORMAT_L32_SINT:
1055       return PIPE_FORMAT_R32_SINT;
1056
1057    case PIPE_FORMAT_LATC1_UNORM:
1058       return PIPE_FORMAT_RGTC1_UNORM;
1059    case PIPE_FORMAT_LATC1_SNORM:
1060       return PIPE_FORMAT_RGTC1_SNORM;
1061
1062    case PIPE_FORMAT_L4A4_UNORM:
1063       return PIPE_FORMAT_R4A4_UNORM;
1064
1065    case PIPE_FORMAT_L8A8_UNORM:
1066       return PIPE_FORMAT_R8A8_UNORM;
1067    case PIPE_FORMAT_L8A8_SNORM:
1068       return PIPE_FORMAT_R8A8_SNORM;
1069    case PIPE_FORMAT_L16A16_UNORM:
1070       return PIPE_FORMAT_R16A16_UNORM;
1071    case PIPE_FORMAT_L16A16_SNORM:
1072       return PIPE_FORMAT_R16A16_SNORM;
1073    case PIPE_FORMAT_L16A16_FLOAT:
1074       return PIPE_FORMAT_R16A16_FLOAT;
1075    case PIPE_FORMAT_L32A32_FLOAT:
1076       return PIPE_FORMAT_R32A32_FLOAT;
1077    case PIPE_FORMAT_L8A8_UINT:
1078       return PIPE_FORMAT_R8A8_UINT;
1079    case PIPE_FORMAT_L8A8_SINT:
1080       return PIPE_FORMAT_R8A8_SINT;
1081    case PIPE_FORMAT_L16A16_UINT:
1082       return PIPE_FORMAT_R16A16_UINT;
1083    case PIPE_FORMAT_L16A16_SINT:
1084       return PIPE_FORMAT_R16A16_SINT;
1085    case PIPE_FORMAT_L32A32_UINT:
1086       return PIPE_FORMAT_R32A32_UINT;
1087    case PIPE_FORMAT_L32A32_SINT:
1088       return PIPE_FORMAT_R32A32_SINT;
1089
1090    /* We don't have compressed red-alpha variants for these. */
1091    case PIPE_FORMAT_LATC2_UNORM:
1092    case PIPE_FORMAT_LATC2_SNORM:
1093       return PIPE_FORMAT_NONE;
1094
1095    default:
1096       assert(!util_format_is_luminance(format) &&
1097              !util_format_is_luminance_alpha(format));
1098       return format;
1099    }
1100 }
1101
1102 /**
1103  * Return the number of components stored.
1104  * Formats with block size != 1x1 will always have 1 component (the block).
1105  */
1106 static INLINE unsigned
1107 util_format_get_nr_components(enum pipe_format format)
1108 {
1109    const struct util_format_description *desc = util_format_description(format);
1110    return desc->nr_channels;
1111 }
1112
1113 /**
1114  * Return the index of the first non-void channel
1115  * -1 if no non-void channels
1116  */
1117 static INLINE int
1118 util_format_get_first_non_void_channel(enum pipe_format format)
1119 {
1120    const struct util_format_description *desc = util_format_description(format);
1121    int i;
1122
1123    for (i = 0; i < 4; i++)
1124       if (desc->channel[i].type != UTIL_FORMAT_TYPE_VOID)
1125          break;
1126
1127    if (i == 4)
1128        return -1;
1129
1130    return i;
1131 }
1132
1133 /*
1134  * Format access functions.
1135  */
1136
1137 void
1138 util_format_read_4f(enum pipe_format format,
1139                     float *dst, unsigned dst_stride,
1140                     const void *src, unsigned src_stride,
1141                     unsigned x, unsigned y, unsigned w, unsigned h);
1142
1143 void
1144 util_format_write_4f(enum pipe_format format,
1145                      const float *src, unsigned src_stride,
1146                      void *dst, unsigned dst_stride,
1147                      unsigned x, unsigned y, unsigned w, unsigned h);
1148
1149 void
1150 util_format_read_4ub(enum pipe_format format,
1151                      uint8_t *dst, unsigned dst_stride,
1152                      const void *src, unsigned src_stride,
1153                      unsigned x, unsigned y, unsigned w, unsigned h);
1154
1155 void
1156 util_format_write_4ub(enum pipe_format format,
1157                       const uint8_t *src, unsigned src_stride,
1158                       void *dst, unsigned dst_stride,
1159                       unsigned x, unsigned y, unsigned w, unsigned h);
1160
1161 void
1162 util_format_read_4ui(enum pipe_format format,
1163                      unsigned *dst, unsigned dst_stride,
1164                      const void *src, unsigned src_stride,
1165                      unsigned x, unsigned y, unsigned w, unsigned h);
1166
1167 void
1168 util_format_write_4ui(enum pipe_format format,
1169                       const unsigned int *src, unsigned src_stride,
1170                       void *dst, unsigned dst_stride,
1171                       unsigned x, unsigned y, unsigned w, unsigned h);
1172
1173 void
1174 util_format_read_4i(enum pipe_format format,
1175                     int *dst, unsigned dst_stride,
1176                     const void *src, unsigned src_stride,
1177                     unsigned x, unsigned y, unsigned w, unsigned h);
1178
1179 void
1180 util_format_write_4i(enum pipe_format format,
1181                      const int *src, unsigned src_stride,
1182                      void *dst, unsigned dst_stride,
1183                      unsigned x, unsigned y, unsigned w, unsigned h);
1184
1185 /*
1186  * Generic format conversion;
1187  */
1188
1189 boolean
1190 util_format_fits_8unorm(const struct util_format_description *format_desc);
1191
1192 boolean
1193 util_format_translate(enum pipe_format dst_format,
1194                       void *dst, unsigned dst_stride,
1195                       unsigned dst_x, unsigned dst_y,
1196                       enum pipe_format src_format,
1197                       const void *src, unsigned src_stride,
1198                       unsigned src_x, unsigned src_y,
1199                       unsigned width, unsigned height);
1200
1201 /*
1202  * Swizzle operations.
1203  */
1204
1205 /* Compose two sets of swizzles.
1206  * If V is a 4D vector and the function parameters represent functions that
1207  * swizzle vector components, this holds:
1208  *     swz2(swz1(V)) = dst(V)
1209  */
1210 void util_format_compose_swizzles(const unsigned char swz1[4],
1211                                   const unsigned char swz2[4],
1212                                   unsigned char dst[4]);
1213
1214 /* Apply the swizzle provided in \param swz (which is one of PIPE_SWIZZLE_x)
1215  * to \param src and store the result in \param dst.
1216  * \param is_integer determines the value written for PIPE_SWIZZLE_ONE.
1217  */
1218 void util_format_apply_color_swizzle(union pipe_color_union *dst,
1219                                      const union pipe_color_union *src,
1220                                      const unsigned char swz[4],
1221                                      const boolean is_integer);
1222
1223 void util_format_swizzle_4f(float *dst, const float *src,
1224                             const unsigned char swz[4]);
1225
1226 void util_format_unswizzle_4f(float *dst, const float *src,
1227                               const unsigned char swz[4]);
1228
1229 #ifdef __cplusplus
1230 } // extern "C" {
1231 #endif
1232
1233 #endif /* ! U_FORMAT_H */