reactos/dll/opengl/mesa/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 "util/u_debug.h"
  35
  36 #ifdef __cplusplus
  37 extern "C" {
  38 #endif
  39
  40
  41 /**
  42  * Describe how to pack/unpack pixels into/from the prescribed format.
  43  *
  44  * XXX: This could be renamed to something like util_format_pack, or broke down
  45  * in flags inside util_format_block that said exactly what we want.
  46  */
  47 enum util_format_layout {
  48    /**
  49     * Formats with util_format_block::width == util_format_block::height == 1
  50     * that can be described as an ordinary data structure.
  51     */
  52    UTIL_FORMAT_LAYOUT_PLAIN = 0,
  53
  54    /**
  55     * Formats with sub-sampled channels.
  56     *
  57     * This is for formats like YV12 where there is less than one sample per
  58     * pixel.
  59     */
  60    UTIL_FORMAT_LAYOUT_SUBSAMPLED = 3,
  61
  62    /**
  63     * S3 Texture Compression formats.
  64     */
  65    UTIL_FORMAT_LAYOUT_S3TC = 4,
  66
  67    /**
  68     * Red-Green Texture Compression formats.
  69     */
  70    UTIL_FORMAT_LAYOUT_RGTC = 5,
  71
  72    /**
  73     * Ericsson Texture Compression
  74     */
  75    UTIL_FORMAT_LAYOUT_ETC = 6,
  76
  77    /**
  78     * Everything else that doesn't fit in any of the above layouts.
  79     */
  80    UTIL_FORMAT_LAYOUT_OTHER = 7
  81 };
  82
  83
  84 struct util_format_block
  85 {
  86    /** Block width in pixels */
  87    unsigned width;
  88
  89    /** Block height in pixels */
  90    unsigned height;
  91
  92    /** Block size in bits */
  93    unsigned bits;
  94 };
  95
  96
  97 enum util_format_type {
  98    UTIL_FORMAT_TYPE_VOID = 0,
  99    UTIL_FORMAT_TYPE_UNSIGNED = 1,
 100    UTIL_FORMAT_TYPE_SIGNED = 2,
 101    UTIL_FORMAT_TYPE_FIXED = 3,
 102    UTIL_FORMAT_TYPE_FLOAT = 4
 103 };
 104
 105
 106 enum util_format_swizzle {
 107    UTIL_FORMAT_SWIZZLE_X = 0,
 108    UTIL_FORMAT_SWIZZLE_Y = 1,
 109    UTIL_FORMAT_SWIZZLE_Z = 2,
 110    UTIL_FORMAT_SWIZZLE_W = 3,
 111    UTIL_FORMAT_SWIZZLE_0 = 4,
 112    UTIL_FORMAT_SWIZZLE_1 = 5,
 113    UTIL_FORMAT_SWIZZLE_NONE = 6,
 114    UTIL_FORMAT_SWIZZLE_MAX = 7  /**< Number of enums counter (must be last) */
 115 };
 116
 117
 118 enum util_format_colorspace {
 119    UTIL_FORMAT_COLORSPACE_RGB = 0,
 120    UTIL_FORMAT_COLORSPACE_SRGB = 1,
 121    UTIL_FORMAT_COLORSPACE_YUV = 2,
 122    UTIL_FORMAT_COLORSPACE_ZS = 3
 123 };
 124
 125
 126 struct util_format_channel_description
 127 {
 128    unsigned type:5;        /**< UTIL_FORMAT_TYPE_x */
 129    unsigned normalized:1;
 130    unsigned pure_integer:1;
 131    unsigned size:9;        /**< bits per channel */
 132 };
 133
 134
 135 struct util_format_description
 136 {
 137    enum pipe_format format;
 138
 139    const char *name;
 140
 141    /**
 142     * Short name, striped of the prefix, lower case.
 143     */
 144    const char *short_name;
 145
 146    /**
 147     * Pixel block dimensions.
 148     */
 149    struct util_format_block block;
 150
 151    enum util_format_layout layout;
 152
 153    /**
 154     * The number of channels.
 155     */
 156    unsigned nr_channels:3;
 157
 158    /**
 159     * Whether all channels have the same number of (whole) bytes.
 160     */
 161    unsigned is_array:1;
 162
 163    /**
 164     * Whether the pixel format can be described as a bitfield structure.
 165     *
 166     * In particular:
 167     * - pixel depth must be 8, 16, or 32 bits;
 168     * - all channels must be unsigned, signed, or void
 169     */
 170    unsigned is_bitmask:1;
 171
 172    /**
 173     * Whether channels have mixed types (ignoring UTIL_FORMAT_TYPE_VOID).
 174     */
 175    unsigned is_mixed:1;
 176
 177    /**
 178     * Input channel description.
 179     *
 180     * Only valid for UTIL_FORMAT_LAYOUT_PLAIN formats.
 181     */
 182    struct util_format_channel_description channel[4];
 183
 184    /**
 185     * Output channel swizzle.
 186     *
 187     * The order is either:
 188     * - RGBA
 189     * - YUV(A)
 190     * - ZS
 191     * depending on the colorspace.
 192     */
 193    unsigned char swizzle[4];
 194
 195    /**
 196     * Colorspace transformation.
 197     */
 198    enum util_format_colorspace colorspace;
 199
 200    /**
 201     * Unpack pixel blocks to R8G8B8A8_UNORM.
 202     * Note: strides are in bytes.
 203     *
 204     * Only defined for non-depth-stencil formats.
 205     */
 206    void
 207    (*unpack_rgba_8unorm)(uint8_t *dst, unsigned dst_stride,
 208                          const uint8_t *src, unsigned src_stride,
 209                          unsigned width, unsigned height);
 210
 211    /**
 212     * Pack pixel blocks from R8G8B8A8_UNORM.
 213     * Note: strides are in bytes.
 214     *
 215     * Only defined for non-depth-stencil formats.
 216     */
 217    void
 218    (*pack_rgba_8unorm)(uint8_t *dst, unsigned dst_stride,
 219                        const uint8_t *src, unsigned src_stride,
 220                        unsigned width, unsigned height);
 221
 222    /**
 223     * Fetch a single pixel (i, j) from a block.
 224     *
 225     * XXX: Only defined for a very few select formats.
 226     */
 227    void
 228    (*fetch_rgba_8unorm)(uint8_t *dst,
 229                         const uint8_t *src,
 230                         unsigned i, unsigned j);
 231
 232    /**
 233     * Unpack pixel blocks to R32G32B32A32_FLOAT.
 234     * Note: strides are in bytes.
 235     *
 236     * Only defined for non-depth-stencil formats.
 237     */
 238    void
 239    (*unpack_rgba_float)(float *dst, unsigned dst_stride,
 240                         const uint8_t *src, unsigned src_stride,
 241                         unsigned width, unsigned height);
 242
 243    /**
 244     * Pack pixel blocks from R32G32B32A32_FLOAT.
 245     * Note: strides are in bytes.
 246     *
 247     * Only defined for non-depth-stencil formats.
 248     */
 249    void
 250    (*pack_rgba_float)(uint8_t *dst, unsigned dst_stride,
 251                       const float *src, unsigned src_stride,
 252                       unsigned width, unsigned height);
 253
 254    /**
 255     * Fetch a single pixel (i, j) from a block.
 256     *
 257     * Only defined for non-depth-stencil and non-integer formats.
 258     */
 259    void
 260    (*fetch_rgba_float)(float *dst,
 261                        const uint8_t *src,
 262                        unsigned i, unsigned j);
 263
 264    /**
 265     * Unpack pixels to Z32_UNORM.
 266     * Note: strides are in bytes.
 267     *
 268     * Only defined for depth formats.
 269     */
 270    void
 271    (*unpack_z_32unorm)(uint32_t *dst, unsigned dst_stride,
 272                        const uint8_t *src, unsigned src_stride,
 273                        unsigned width, unsigned height);
 274
 275    /**
 276     * Pack pixels from Z32_FLOAT.
 277     * Note: strides are in bytes.
 278     *
 279     * Only defined for depth formats.
 280     */
 281    void
 282    (*pack_z_32unorm)(uint8_t *dst, unsigned dst_stride,
 283                      const uint32_t *src, unsigned src_stride,
 284                      unsigned width, unsigned height);
 285
 286    /**
 287     * Unpack pixels to Z32_FLOAT.
 288     * Note: strides are in bytes.
 289     *
 290     * Only defined for depth formats.
 291     */
 292    void
 293    (*unpack_z_float)(float *dst, unsigned dst_stride,
 294                      const uint8_t *src, unsigned src_stride,
 295                      unsigned width, unsigned height);
 296
 297    /**
 298     * Pack pixels from Z32_FLOAT.
 299     * Note: strides are in bytes.
 300     *
 301     * Only defined for depth formats.
 302     */
 303    void
 304    (*pack_z_float)(uint8_t *dst, unsigned dst_stride,
 305                    const float *src, unsigned src_stride,
 306                    unsigned width, unsigned height);
 307
 308    /**
 309     * Unpack pixels to S8_UINT.
 310     * Note: strides are in bytes.
 311     *
 312     * Only defined for stencil formats.
 313     */
 314    void
 315    (*unpack_s_8uint)(uint8_t *dst, unsigned dst_stride,
 316                      const uint8_t *src, unsigned src_stride,
 317                      unsigned width, unsigned height);
 318
 319    /**
 320     * Pack pixels from S8_UINT.
 321     * Note: strides are in bytes.
 322     *
 323     * Only defined for stencil formats.
 324     */
 325    void
 326    (*pack_s_8uint)(uint8_t *dst, unsigned dst_stride,
 327                    const uint8_t *src, unsigned src_stride,
 328                    unsigned width, unsigned height);
 329
 330   /**
 331     * Unpack pixel blocks to R32G32B32A32_UINT.
 332     * Note: strides are in bytes.
 333     *
 334     * Only defined for INT formats.
 335     */
 336    void
 337    (*unpack_rgba_uint)(unsigned *dst, unsigned dst_stride,
 338                        const uint8_t *src, unsigned src_stride,
 339                        unsigned width, unsigned height);
 340
 341    void
 342    (*pack_rgba_uint)(uint8_t *dst, unsigned dst_stride,
 343                      const unsigned *src, unsigned src_stride,
 344                      unsigned width, unsigned height);
 345
 346   /**
 347     * Unpack pixel blocks to R32G32B32A32_SINT.
 348     * Note: strides are in bytes.
 349     *
 350     * Only defined for INT formats.
 351     */
 352    void
 353    (*unpack_rgba_sint)(signed *dst, unsigned dst_stride,
 354                        const uint8_t *src, unsigned src_stride,
 355                        unsigned width, unsigned height);
 356
 357    void
 358    (*pack_rgba_sint)(uint8_t *dst, unsigned dst_stride,
 359                      const int *src, unsigned src_stride,
 360                      unsigned width, unsigned height);
 361
 362    /**
 363     * Fetch a single pixel (i, j) from a block.
 364     *
 365     * Only defined for unsigned (pure) integer formats.
 366     */
 367    void
 368    (*fetch_rgba_uint)(uint32_t *dst,
 369                       const uint8_t *src,
 370                       unsigned i, unsigned j);
 371
 372    /**
 373     * Fetch a single pixel (i, j) from a block.
 374     *
 375     * Only defined for signed (pure) integer formats.
 376     */
 377    void
 378    (*fetch_rgba_sint)(int32_t *dst,
 379                       const uint8_t *src,
 380                       unsigned i, unsigned j);
 381 };
 382
 383
 384 extern const struct util_format_description
 385 util_format_description_table[];
 386
 387
 388 const struct util_format_description *
 389 util_format_description(enum pipe_format format);
 390
 391
 392 /*
 393  * Format query functions.
 394  */
 395
 396 static INLINE const char *
 397 util_format_name(enum pipe_format format)
 398 {
 399    const struct util_format_description *desc = util_format_description(format);
 400
 401    assert(desc);
 402    if (!desc) {
 403       return "PIPE_FORMAT_???";
 404    }
 405
 406    return desc->name;
 407 }
 408
 409 static INLINE const char *
 410 util_format_short_name(enum pipe_format format)
 411 {
 412    const struct util_format_description *desc = util_format_description(format);
 413
 414    assert(desc);
 415    if (!desc) {
 416       return "???";
 417    }
 418
 419    return desc->short_name;
 420 }
 421
 422 /**
 423  * Whether this format is plain, see UTIL_FORMAT_LAYOUT_PLAIN for more info.
 424  */
 425 static INLINE boolean
 426 util_format_is_plain(enum pipe_format format)
 427 {
 428    const struct util_format_description *desc = util_format_description(format);
 429
 430    if (!format) {
 431       return FALSE;
 432    }
 433
 434    return desc->layout == UTIL_FORMAT_LAYOUT_PLAIN ? TRUE : FALSE;
 435 }
 436
 437 static INLINE boolean
 438 util_format_is_compressed(enum pipe_format format)
 439 {
 440    const struct util_format_description *desc = util_format_description(format);
 441
 442    assert(desc);
 443    if (!desc) {
 444       return FALSE;
 445    }
 446
 447    switch (desc->layout) {
 448    case UTIL_FORMAT_LAYOUT_S3TC:
 449    case UTIL_FORMAT_LAYOUT_RGTC:
 450       /* XXX add other formats in the future */
 451       return TRUE;
 452    default:
 453       return FALSE;
 454    }
 455 }
 456
 457 static INLINE boolean
 458 util_format_is_s3tc(enum pipe_format format)
 459 {
 460    const struct util_format_description *desc = util_format_description(format);
 461
 462    assert(desc);
 463    if (!desc) {
 464       return FALSE;
 465    }
 466
 467    return desc->layout == UTIL_FORMAT_LAYOUT_S3TC ? TRUE : FALSE;
 468 }
 469
 470 static INLINE boolean
 471 util_format_is_srgb(enum pipe_format format)
 472 {
 473    const struct util_format_description *desc = util_format_description(format);
 474    return desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB;
 475 }
 476
 477 static INLINE boolean
 478 util_format_has_depth(const struct util_format_description *desc)
 479 {
 480    return desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS &&
 481           desc->swizzle[0] != UTIL_FORMAT_SWIZZLE_NONE;
 482 }
 483
 484 static INLINE boolean
 485 util_format_has_stencil(const struct util_format_description *desc)
 486 {
 487    return desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS &&
 488           desc->swizzle[1] != UTIL_FORMAT_SWIZZLE_NONE;
 489 }
 490
 491 static INLINE boolean
 492 util_format_is_depth_or_stencil(enum pipe_format format)
 493 {
 494    const struct util_format_description *desc = util_format_description(format);
 495
 496    assert(desc);
 497    if (!desc) {
 498       return FALSE;
 499    }
 500
 501    return util_format_has_depth(desc) ||
 502           util_format_has_stencil(desc);
 503 }
 504
 505 static INLINE boolean
 506 util_format_is_depth_and_stencil(enum pipe_format format)
 507 {
 508    const struct util_format_description *desc = util_format_description(format);
 509
 510    assert(desc);
 511    if (!desc) {
 512       return FALSE;
 513    }
 514
 515    return util_format_has_depth(desc) &&
 516           util_format_has_stencil(desc);
 517 }
 518
 519
 520 /**
 521  * Give the RGBA colormask of the channels that can be represented in this
 522  * format.
 523  *
 524  * That is, the channels whose values are preserved.
 525  */
 526 static INLINE unsigned
 527 util_format_colormask(const struct util_format_description *desc)
 528 {
 529    unsigned colormask;
 530    unsigned chan;
 531
 532    switch (desc->colorspace) {
 533    case UTIL_FORMAT_COLORSPACE_RGB:
 534    case UTIL_FORMAT_COLORSPACE_SRGB:
 535    case UTIL_FORMAT_COLORSPACE_YUV:
 536       colormask = 0;
 537       for (chan = 0; chan < 4; ++chan) {
 538          if (desc->swizzle[chan] < 4) {
 539             colormask |= (1 << chan);
 540          }
 541       }
 542       return colormask;
 543    case UTIL_FORMAT_COLORSPACE_ZS:
 544       return 0;
 545    default:
 546       assert(0);
 547       return 0;
 548    }
 549 }
 550
 551
 552 boolean
 553 util_format_is_float(enum pipe_format format);
 554
 555
 556 boolean
 557 util_format_is_rgb_no_alpha(enum pipe_format format);
 558
 559
 560 boolean
 561 util_format_is_luminance(enum pipe_format format);
 562
 563
 564 boolean
 565 util_format_is_luminance_alpha(enum pipe_format format);
 566
 567
 568 boolean
 569 util_format_is_intensity(enum pipe_format format);
 570
 571 boolean
 572 util_format_is_pure_integer(enum pipe_format format);
 573
 574 boolean
 575 util_format_is_pure_sint(enum pipe_format format);
 576
 577 boolean
 578 util_format_is_pure_uint(enum pipe_format format);
 579
 580 /**
 581  * Whether the src format can be blitted to destation format with a simple
 582  * memcpy.
 583  */
 584 boolean
 585 util_is_format_compatible(const struct util_format_description *src_desc,
 586                           const struct util_format_description *dst_desc);
 587
 588 /**
 589  * Whether the format is supported by Gallium for the given bindings.
 590  * This covers S3TC textures and floating-point render targets.
 591  */
 592 boolean
 593 util_format_is_supported(enum pipe_format format, unsigned bind);
 594
 595 /**
 596  * Whether this format is a rgab8 variant.
 597  *
 598  * That is, any format that matches the
 599  *
 600  *   PIPE_FORMAT_?8?8?8?8_UNORM
 601  */
 602 static INLINE boolean
 603 util_format_is_rgba8_variant(const struct util_format_description *desc)
 604 {
 605    unsigned chan;
 606
 607    if(desc->block.width != 1 ||
 608       desc->block.height != 1 ||
 609       desc->block.bits != 32)
 610       return FALSE;
 611
 612    for(chan = 0; chan < 4; ++chan) {
 613       if(desc->channel[chan].type != UTIL_FORMAT_TYPE_UNSIGNED &&
 614          desc->channel[chan].type != UTIL_FORMAT_TYPE_VOID)
 615          return FALSE;
 616       if(desc->channel[chan].size != 8)
 617          return FALSE;
 618    }
 619
 620    return TRUE;
 621 }
 622
 623
 624 /**
 625  * Return total bits needed for the pixel format per block.
 626  */
 627 static INLINE uint
 628 util_format_get_blocksizebits(enum pipe_format format)
 629 {
 630    const struct util_format_description *desc = util_format_description(format);
 631
 632    assert(desc);
 633    if (!desc) {
 634       return 0;
 635    }
 636
 637    return desc->block.bits;
 638 }
 639
 640 /**
 641  * Return bytes per block (not pixel) for the given format.
 642  */
 643 static INLINE uint
 644 util_format_get_blocksize(enum pipe_format format)
 645 {
 646    uint bits = util_format_get_blocksizebits(format);
 647
 648    assert(bits % 8 == 0);
 649
 650    return bits / 8;
 651 }
 652
 653 static INLINE uint
 654 util_format_get_blockwidth(enum pipe_format format)
 655 {
 656    const struct util_format_description *desc = util_format_description(format);
 657
 658    assert(desc);
 659    if (!desc) {
 660       return 1;
 661    }
 662
 663    return desc->block.width;
 664 }
 665
 666 static INLINE uint
 667 util_format_get_blockheight(enum pipe_format format)
 668 {
 669    const struct util_format_description *desc = util_format_description(format);
 670
 671    assert(desc);
 672    if (!desc) {
 673       return 1;
 674    }
 675
 676    return desc->block.height;
 677 }
 678
 679 static INLINE unsigned
 680 util_format_get_nblocksx(enum pipe_format format,
 681                          unsigned x)
 682 {
 683    unsigned blockwidth = util_format_get_blockwidth(format);
 684    return (x + blockwidth - 1) / blockwidth;
 685 }
 686
 687 static INLINE unsigned
 688 util_format_get_nblocksy(enum pipe_format format,
 689                          unsigned y)
 690 {
 691    unsigned blockheight = util_format_get_blockheight(format);
 692    return (y + blockheight - 1) / blockheight;
 693 }
 694
 695 static INLINE unsigned
 696 util_format_get_nblocks(enum pipe_format format,
 697                         unsigned width,
 698                         unsigned height)
 699 {
 700    return util_format_get_nblocksx(format, width) * util_format_get_nblocksy(format, height);
 701 }
 702
 703 static INLINE size_t
 704 util_format_get_stride(enum pipe_format format,
 705                        unsigned width)
 706 {
 707    return util_format_get_nblocksx(format, width) * util_format_get_blocksize(format);
 708 }
 709
 710 static INLINE size_t
 711 util_format_get_2d_size(enum pipe_format format,
 712                         size_t stride,
 713                         unsigned height)
 714 {
 715    return util_format_get_nblocksy(format, height) * stride;
 716 }
 717
 718 static INLINE uint
 719 util_format_get_component_bits(enum pipe_format format,
 720                                enum util_format_colorspace colorspace,
 721                                uint component)
 722 {
 723    const struct util_format_description *desc = util_format_description(format);
 724    enum util_format_colorspace desc_colorspace;
 725
 726    assert(format);
 727    if (!format) {
 728       return 0;
 729    }
 730
 731    assert(component < 4);
 732
 733    /* Treat RGB and SRGB as equivalent. */
 734    if (colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 735       colorspace = UTIL_FORMAT_COLORSPACE_RGB;
 736    }
 737    if (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 738       desc_colorspace = UTIL_FORMAT_COLORSPACE_RGB;
 739    } else {
 740       desc_colorspace = desc->colorspace;
 741    }
 742
 743    if (desc_colorspace != colorspace) {
 744       return 0;
 745    }
 746
 747    switch (desc->swizzle[component]) {
 748    case UTIL_FORMAT_SWIZZLE_X:
 749       return desc->channel[0].size;
 750    case UTIL_FORMAT_SWIZZLE_Y:
 751       return desc->channel[1].size;
 752    case UTIL_FORMAT_SWIZZLE_Z:
 753       return desc->channel[2].size;
 754    case UTIL_FORMAT_SWIZZLE_W:
 755       return desc->channel[3].size;
 756    default:
 757       return 0;
 758    }
 759 }
 760
 761 static INLINE boolean
 762 util_format_has_alpha(enum pipe_format format)
 763 {
 764    const struct util_format_description *desc = util_format_description(format);
 765
 766    assert(format);
 767    if (!format) {
 768       return FALSE;
 769    }
 770
 771    switch (desc->colorspace) {
 772    case UTIL_FORMAT_COLORSPACE_RGB:
 773    case UTIL_FORMAT_COLORSPACE_SRGB:
 774       return desc->swizzle[3] != UTIL_FORMAT_SWIZZLE_1;
 775    case UTIL_FORMAT_COLORSPACE_YUV:
 776       return FALSE;
 777    case UTIL_FORMAT_COLORSPACE_ZS:
 778       return FALSE;
 779    default:
 780       assert(0);
 781       return FALSE;
 782    }
 783 }
 784
 785 /**
 786  * Given a linear RGB colorspace format, return the corresponding SRGB
 787  * format, or PIPE_FORMAT_NONE if none.
 788  */
 789 static INLINE enum pipe_format
 790 util_format_srgb(enum pipe_format format)
 791 {
 792    switch (format) {
 793    case PIPE_FORMAT_L8_UNORM:
 794       return PIPE_FORMAT_L8_SRGB;
 795    case PIPE_FORMAT_L8A8_UNORM:
 796       return PIPE_FORMAT_L8A8_SRGB;
 797    case PIPE_FORMAT_R8G8B8_UNORM:
 798       return PIPE_FORMAT_R8G8B8_SRGB;
 799    case PIPE_FORMAT_A8B8G8R8_UNORM:
 800       return PIPE_FORMAT_A8B8G8R8_SRGB;
 801    case PIPE_FORMAT_X8B8G8R8_UNORM:
 802       return PIPE_FORMAT_X8B8G8R8_SRGB;
 803    case PIPE_FORMAT_B8G8R8A8_UNORM:
 804       return PIPE_FORMAT_B8G8R8A8_SRGB;
 805    case PIPE_FORMAT_B8G8R8X8_UNORM:
 806       return PIPE_FORMAT_B8G8R8X8_SRGB;
 807    case PIPE_FORMAT_A8R8G8B8_UNORM:
 808       return PIPE_FORMAT_A8R8G8B8_SRGB;
 809    case PIPE_FORMAT_X8R8G8B8_UNORM:
 810       return PIPE_FORMAT_X8R8G8B8_SRGB;
 811    case PIPE_FORMAT_DXT1_RGB:
 812       return PIPE_FORMAT_DXT1_SRGB;
 813    case PIPE_FORMAT_DXT1_RGBA:
 814       return PIPE_FORMAT_DXT1_SRGBA;
 815    case PIPE_FORMAT_DXT3_RGBA:
 816       return PIPE_FORMAT_DXT3_SRGBA;
 817    case PIPE_FORMAT_DXT5_RGBA:
 818       return PIPE_FORMAT_DXT5_SRGBA;
 819    default:
 820       return PIPE_FORMAT_NONE;
 821    }
 822 }
 823
 824 /**
 825  * Given an sRGB format, return the corresponding linear colorspace format.
 826  * For non sRGB formats, return the format unchanged.
 827  */
 828 static INLINE enum pipe_format
 829 util_format_linear(enum pipe_format format)
 830 {
 831    switch (format) {
 832    case PIPE_FORMAT_L8_SRGB:
 833       return PIPE_FORMAT_L8_UNORM;
 834    case PIPE_FORMAT_L8A8_SRGB:
 835       return PIPE_FORMAT_L8A8_UNORM;
 836    case PIPE_FORMAT_R8G8B8_SRGB:
 837       return PIPE_FORMAT_R8G8B8_UNORM;
 838    case PIPE_FORMAT_A8B8G8R8_SRGB:
 839       return PIPE_FORMAT_A8B8G8R8_UNORM;
 840    case PIPE_FORMAT_X8B8G8R8_SRGB:
 841       return PIPE_FORMAT_X8B8G8R8_UNORM;
 842    case PIPE_FORMAT_B8G8R8A8_SRGB:
 843       return PIPE_FORMAT_B8G8R8A8_UNORM;
 844    case PIPE_FORMAT_B8G8R8X8_SRGB:
 845       return PIPE_FORMAT_B8G8R8X8_UNORM;
 846    case PIPE_FORMAT_A8R8G8B8_SRGB:
 847       return PIPE_FORMAT_A8R8G8B8_UNORM;
 848    case PIPE_FORMAT_X8R8G8B8_SRGB:
 849       return PIPE_FORMAT_X8R8G8B8_UNORM;
 850    case PIPE_FORMAT_DXT1_SRGB:
 851       return PIPE_FORMAT_DXT1_RGB;
 852    case PIPE_FORMAT_DXT1_SRGBA:
 853       return PIPE_FORMAT_DXT1_RGBA;
 854    case PIPE_FORMAT_DXT3_SRGBA:
 855       return PIPE_FORMAT_DXT3_RGBA;
 856    case PIPE_FORMAT_DXT5_SRGBA:
 857       return PIPE_FORMAT_DXT5_RGBA;
 858    default:
 859       return format;
 860    }
 861 }
 862
 863 /**
 864  * Return the number of components stored.
 865  * Formats with block size != 1x1 will always have 1 component (the block).
 866  */
 867 static INLINE unsigned
 868 util_format_get_nr_components(enum pipe_format format)
 869 {
 870    const struct util_format_description *desc = util_format_description(format);
 871    return desc->nr_channels;
 872 }
 873
 874 /**
 875  * Return the index of the first non-void channel
 876  * -1 if no non-void channels
 877  */
 878 static INLINE int
 879 util_format_get_first_non_void_channel(enum pipe_format format)
 880 {
 881    const struct util_format_description *desc = util_format_description(format);
 882    int i;
 883
 884    for (i = 0; i < 4; i++)
 885       if (desc->channel[i].type != UTIL_FORMAT_TYPE_VOID)
 886          break;
 887
 888    if (i == 4)
 889        return -1;
 890
 891    return i;
 892 }
 893
 894 /*
 895  * Format access functions.
 896  */
 897
 898 void
 899 util_format_read_4f(enum pipe_format format,
 900                     float *dst, unsigned dst_stride,
 901                     const void *src, unsigned src_stride,
 902                     unsigned x, unsigned y, unsigned w, unsigned h);
 903
 904 void
 905 util_format_write_4f(enum pipe_format format,
 906                      const float *src, unsigned src_stride,
 907                      void *dst, unsigned dst_stride,
 908                      unsigned x, unsigned y, unsigned w, unsigned h);
 909
 910 void
 911 util_format_read_4ub(enum pipe_format format,
 912                      uint8_t *dst, unsigned dst_stride,
 913                      const void *src, unsigned src_stride,
 914                      unsigned x, unsigned y, unsigned w, unsigned h);
 915
 916 void
 917 util_format_write_4ub(enum pipe_format format,
 918                       const uint8_t *src, unsigned src_stride,
 919                       void *dst, unsigned dst_stride,
 920                       unsigned x, unsigned y, unsigned w, unsigned h);
 921
 922 void
 923 util_format_read_4ui(enum pipe_format format,
 924                      unsigned *dst, unsigned dst_stride,
 925                      const void *src, unsigned src_stride,
 926                      unsigned x, unsigned y, unsigned w, unsigned h);
 927
 928 void
 929 util_format_write_4ui(enum pipe_format format,
 930                       const unsigned int *src, unsigned src_stride,
 931                       void *dst, unsigned dst_stride,
 932                       unsigned x, unsigned y, unsigned w, unsigned h);
 933
 934 void
 935 util_format_read_4i(enum pipe_format format,
 936                     int *dst, unsigned dst_stride,
 937                     const void *src, unsigned src_stride,
 938                     unsigned x, unsigned y, unsigned w, unsigned h);
 939
 940 void
 941 util_format_write_4i(enum pipe_format format,
 942                      const int *src, unsigned src_stride,
 943                      void *dst, unsigned dst_stride,
 944                      unsigned x, unsigned y, unsigned w, unsigned h);
 945
 946 /*
 947  * Generic format conversion;
 948  */
 949
 950 boolean
 951 util_format_fits_8unorm(const struct util_format_description *format_desc);
 952
 953 void
 954 util_format_translate(enum pipe_format dst_format,
 955                       void *dst, unsigned dst_stride,
 956                       unsigned dst_x, unsigned dst_y,
 957                       enum pipe_format src_format,
 958                       const void *src, unsigned src_stride,
 959                       unsigned src_x, unsigned src_y,
 960                       unsigned width, unsigned height);
 961
 962 /*
 963  * Swizzle operations.
 964  */
 965
 966 /* Compose two sets of swizzles.
 967  * If V is a 4D vector and the function parameters represent functions that
 968  * swizzle vector components, this holds:
 969  *     swz2(swz1(V)) = dst(V)
 970  */
 971 void util_format_compose_swizzles(const unsigned char swz1[4],
 972                                   const unsigned char swz2[4],
 973                                   unsigned char dst[4]);
 974
 975 void util_format_swizzle_4f(float *dst, const float *src,
 976                             const unsigned char swz[4]);
 977
 978 void util_format_unswizzle_4f(float *dst, const float *src,
 979                               const unsigned char swz[4]);
 980
 981 #ifdef __cplusplus
 982 } // extern "C" {
 983 #endif
 984
 985 #endif /* ! U_FORMAT_H */