src/gallium/auxiliary/util/u_format.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2010 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * @file
  30  * Pixel format accessor functions.
  31  *
  32  * @author Jose Fonseca <jfonseca@vmware.com>
  33  */
  34
  35 #include "u_math.h"
  36 #include "u_memory.h"
  37 #include "u_rect.h"
  38 #include "u_format.h"
  39 #include "u_format_s3tc.h"
  40
  41 #include "pipe/p_defines.h"
  42
  43
  44 boolean
  45 util_format_is_float(enum pipe_format format)
  46 {
  47    const struct util_format_description *desc = util_format_description(format);
  48    unsigned i;
  49
  50    assert(desc);
  51    if (!desc) {
  52       return FALSE;
  53    }
  54
  55    i = util_format_get_first_non_void_channel(format);
  56    if (i == -1) {
  57       return FALSE;
  58    }
  59
  60    return desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT ? TRUE : FALSE;
  61 }
  62
  63
  64 /** Test if the format contains RGB, but not alpha */
  65 boolean
  66 util_format_has_alpha(enum pipe_format format)
  67 {
  68    const struct util_format_description *desc =
  69       util_format_description(format);
  70
  71    return (desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
  72            desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
  73           desc->swizzle[3] != UTIL_FORMAT_SWIZZLE_1;
  74 }
  75
  76
  77 boolean
  78 util_format_is_luminance(enum pipe_format format)
  79 {
  80    const struct util_format_description *desc =
  81       util_format_description(format);
  82
  83    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
  84         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
  85        desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&
  86        desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
  87        desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
  88        desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_1) {
  89       return TRUE;
  90    }
  91    return FALSE;
  92 }
  93
  94 boolean
  95 util_format_is_pure_integer(enum pipe_format format)
  96 {
  97    const struct util_format_description *desc = util_format_description(format);
  98    int i;
  99
 100    /* Find the first non-void channel. */
 101    i = util_format_get_first_non_void_channel(format);
 102    if (i == -1)
 103       return FALSE;
 104
 105    return desc->channel[i].pure_integer ? TRUE : FALSE;
 106 }
 107
 108 boolean
 109 util_format_is_pure_sint(enum pipe_format format)
 110 {
 111    const struct util_format_description *desc = util_format_description(format);
 112    int i;
 113
 114    i = util_format_get_first_non_void_channel(format);
 115    if (i == -1)
 116       return FALSE;
 117
 118    return (desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED && desc->channel[i].pure_integer) ? TRUE : FALSE;
 119 }
 120
 121 boolean
 122 util_format_is_pure_uint(enum pipe_format format)
 123 {
 124    const struct util_format_description *desc = util_format_description(format);
 125    int i;
 126
 127    i = util_format_get_first_non_void_channel(format);
 128    if (i == -1)
 129       return FALSE;
 130
 131    return (desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED && desc->channel[i].pure_integer) ? TRUE : FALSE;
 132 }
 133
 134
 135 boolean
 136 util_format_is_luminance_alpha(enum pipe_format format)
 137 {
 138    const struct util_format_description *desc =
 139       util_format_description(format);
 140
 141    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 142         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 143        desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&
 144        desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
 145        desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
 146        desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_Y) {
 147       return TRUE;
 148    }
 149    return FALSE;
 150 }
 151
 152
 153 boolean
 154 util_format_is_intensity(enum pipe_format format)
 155 {
 156    const struct util_format_description *desc =
 157       util_format_description(format);
 158
 159    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 160         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 161        desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&
 162        desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
 163        desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
 164        desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_X) {
 165       return TRUE;
 166    }
 167    return FALSE;
 168 }
 169
 170
 171 boolean
 172 util_format_is_supported(enum pipe_format format, unsigned bind)
 173 {
 174    if (util_format_is_s3tc(format) && !util_format_s3tc_enabled) {
 175       return FALSE;
 176    }
 177
 178 #ifndef TEXTURE_FLOAT_ENABLED
 179    if ((bind & PIPE_BIND_RENDER_TARGET) &&
 180        format != PIPE_FORMAT_R9G9B9E5_FLOAT &&
 181        format != PIPE_FORMAT_R11G11B10_FLOAT &&
 182        util_format_is_float(format)) {
 183       return FALSE;
 184    }
 185 #endif
 186
 187    return TRUE;
 188 }
 189
 190
 191 void
 192 util_format_read_4f(enum pipe_format format,
 193                     float *dst, unsigned dst_stride,
 194                     const void *src, unsigned src_stride,
 195                     unsigned x, unsigned y, unsigned w, unsigned h)
 196 {
 197    const struct util_format_description *format_desc;
 198    const uint8_t *src_row;
 199    float *dst_row;
 200
 201    format_desc = util_format_description(format);
 202
 203    assert(x % format_desc->block.width == 0);
 204    assert(y % format_desc->block.height == 0);
 205
 206    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 207    dst_row = dst;
 208
 209    format_desc->unpack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, h);
 210 }
 211
 212
 213 void
 214 util_format_write_4f(enum pipe_format format,
 215                      const float *src, unsigned src_stride,
 216                      void *dst, unsigned dst_stride,
 217                      unsigned x, unsigned y, unsigned w, unsigned h)
 218 {
 219    const struct util_format_description *format_desc;
 220    uint8_t *dst_row;
 221    const float *src_row;
 222
 223    format_desc = util_format_description(format);
 224
 225    assert(x % format_desc->block.width == 0);
 226    assert(y % format_desc->block.height == 0);
 227
 228    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 229    src_row = src;
 230
 231    format_desc->pack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, h);
 232 }
 233
 234
 235 void
 236 util_format_read_4ub(enum pipe_format format, uint8_t *dst, unsigned dst_stride, const void *src, unsigned src_stride, unsigned x, unsigned y, unsigned w, unsigned h)
 237 {
 238    const struct util_format_description *format_desc;
 239    const uint8_t *src_row;
 240    uint8_t *dst_row;
 241
 242    format_desc = util_format_description(format);
 243
 244    assert(x % format_desc->block.width == 0);
 245    assert(y % format_desc->block.height == 0);
 246
 247    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 248    dst_row = dst;
 249
 250    format_desc->unpack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
 251 }
 252
 253
 254 void
 255 util_format_write_4ub(enum pipe_format format, const uint8_t *src, unsigned src_stride, void *dst, unsigned dst_stride, unsigned x, unsigned y, unsigned w, unsigned h)
 256 {
 257    const struct util_format_description *format_desc;
 258    uint8_t *dst_row;
 259    const uint8_t *src_row;
 260
 261    format_desc = util_format_description(format);
 262
 263    assert(x % format_desc->block.width == 0);
 264    assert(y % format_desc->block.height == 0);
 265
 266    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 267    src_row = src;
 268
 269    format_desc->pack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
 270 }
 271
 272 void
 273 util_format_read_4ui(enum pipe_format format,
 274                      unsigned *dst, unsigned dst_stride,
 275                      const void *src, unsigned src_stride,
 276                      unsigned x, unsigned y, unsigned w, unsigned h)
 277 {
 278    const struct util_format_description *format_desc;
 279    const uint8_t *src_row;
 280    unsigned *dst_row;
 281
 282    format_desc = util_format_description(format);
 283
 284    assert(x % format_desc->block.width == 0);
 285    assert(y % format_desc->block.height == 0);
 286
 287    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 288    dst_row = dst;
 289
 290    format_desc->unpack_rgba_uint(dst_row, dst_stride, src_row, src_stride, w, h);
 291 }
 292
 293 void
 294 util_format_write_4ui(enum pipe_format format,
 295                       const unsigned int *src, unsigned src_stride,
 296                       void *dst, unsigned dst_stride,
 297                       unsigned x, unsigned y, unsigned w, unsigned h)
 298 {
 299    const struct util_format_description *format_desc;
 300    uint8_t *dst_row;
 301    const unsigned *src_row;
 302
 303    format_desc = util_format_description(format);
 304
 305    assert(x % format_desc->block.width == 0);
 306    assert(y % format_desc->block.height == 0);
 307
 308    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 309    src_row = src;
 310
 311    format_desc->pack_rgba_uint(dst_row, dst_stride, src_row, src_stride, w, h);
 312 }
 313
 314 void
 315 util_format_read_4i(enum pipe_format format,
 316                     int *dst, unsigned dst_stride,
 317                     const void *src, unsigned src_stride,
 318                     unsigned x, unsigned y, unsigned w, unsigned h)
 319 {
 320    const struct util_format_description *format_desc;
 321    const uint8_t *src_row;
 322    int *dst_row;
 323
 324    format_desc = util_format_description(format);
 325
 326    assert(x % format_desc->block.width == 0);
 327    assert(y % format_desc->block.height == 0);
 328
 329    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 330    dst_row = dst;
 331
 332    format_desc->unpack_rgba_sint(dst_row, dst_stride, src_row, src_stride, w, h);
 333 }
 334
 335 void
 336 util_format_write_4i(enum pipe_format format,
 337                       const int *src, unsigned src_stride,
 338                       void *dst, unsigned dst_stride,
 339                       unsigned x, unsigned y, unsigned w, unsigned h)
 340 {
 341    const struct util_format_description *format_desc;
 342    uint8_t *dst_row;
 343    const int *src_row;
 344
 345    format_desc = util_format_description(format);
 346
 347    assert(x % format_desc->block.width == 0);
 348    assert(y % format_desc->block.height == 0);
 349
 350    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 351    src_row = src;
 352
 353    format_desc->pack_rgba_sint(dst_row, dst_stride, src_row, src_stride, w, h);
 354 }
 355
 356 boolean
 357 util_is_format_compatible(const struct util_format_description *src_desc,
 358                           const struct util_format_description *dst_desc)
 359 {
 360    unsigned chan;
 361
 362    if (src_desc->format == dst_desc->format) {
 363       return TRUE;
 364    }
 365
 366    if (src_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN ||
 367        dst_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN) {
 368       return FALSE;
 369    }
 370
 371    if (src_desc->block.bits != dst_desc->block.bits ||
 372        src_desc->nr_channels != dst_desc->nr_channels ||
 373        src_desc->colorspace != dst_desc->colorspace) {
 374       return FALSE;
 375    }
 376
 377    for (chan = 0; chan < 4; ++chan) {
 378       if (src_desc->channel[chan].size !=
 379           dst_desc->channel[chan].size) {
 380          return FALSE;
 381       }
 382    }
 383
 384    for (chan = 0; chan < 4; ++chan) {
 385       enum util_format_swizzle swizzle = dst_desc->swizzle[chan];
 386
 387       if (swizzle < 4) {
 388          if (src_desc->swizzle[chan] != swizzle) {
 389             return FALSE;
 390          }
 391          if ((src_desc->channel[swizzle].type !=
 392               dst_desc->channel[swizzle].type) ||
 393              (src_desc->channel[swizzle].normalized !=
 394               dst_desc->channel[swizzle].normalized)) {
 395             return FALSE;
 396          }
 397       }
 398    }
 399
 400    return TRUE;
 401 }
 402
 403
 404 boolean
 405 util_format_fits_8unorm(const struct util_format_description *format_desc)
 406 {
 407    unsigned chan;
 408
 409    /*
 410     * After linearized sRGB values require more than 8bits.
 411     */
 412
 413    if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 414       return FALSE;
 415    }
 416
 417    switch (format_desc->layout) {
 418
 419    case UTIL_FORMAT_LAYOUT_S3TC:
 420       /*
 421        * These are straight forward.
 422        */
 423       return TRUE;
 424    case UTIL_FORMAT_LAYOUT_RGTC:
 425       if (format_desc->format == PIPE_FORMAT_RGTC1_SNORM ||
 426           format_desc->format == PIPE_FORMAT_RGTC2_SNORM ||
 427           format_desc->format == PIPE_FORMAT_LATC1_SNORM ||
 428           format_desc->format == PIPE_FORMAT_LATC2_SNORM)
 429          return FALSE;
 430       return TRUE;
 431
 432    case UTIL_FORMAT_LAYOUT_PLAIN:
 433       /*
 434        * For these we can find a generic rule.
 435        */
 436
 437       for (chan = 0; chan < format_desc->nr_channels; ++chan) {
 438          switch (format_desc->channel[chan].type) {
 439          case UTIL_FORMAT_TYPE_VOID:
 440             break;
 441          case UTIL_FORMAT_TYPE_UNSIGNED:
 442             if (!format_desc->channel[chan].normalized ||
 443                 format_desc->channel[chan].size > 8) {
 444                return FALSE;
 445             }
 446             break;
 447          default:
 448             return FALSE;
 449          }
 450       }
 451       return TRUE;
 452
 453    default:
 454       /*
 455        * Handle all others on a case by case basis.
 456        */
 457
 458       switch (format_desc->format) {
 459       case PIPE_FORMAT_R1_UNORM:
 460       case PIPE_FORMAT_UYVY:
 461       case PIPE_FORMAT_YUYV:
 462       case PIPE_FORMAT_R8G8_B8G8_UNORM:
 463       case PIPE_FORMAT_G8R8_G8B8_UNORM:
 464          return TRUE;
 465
 466       default:
 467          return FALSE;
 468       }
 469    }
 470 }
 471
 472
 473 void
 474 util_format_translate(enum pipe_format dst_format,
 475                       void *dst, unsigned dst_stride,
 476                       unsigned dst_x, unsigned dst_y,
 477                       enum pipe_format src_format,
 478                       const void *src, unsigned src_stride,
 479                       unsigned src_x, unsigned src_y,
 480                       unsigned width, unsigned height)
 481 {
 482    const struct util_format_description *dst_format_desc;
 483    const struct util_format_description *src_format_desc;
 484    uint8_t *dst_row;
 485    const uint8_t *src_row;
 486    unsigned x_step, y_step;
 487    unsigned dst_step;
 488    unsigned src_step;
 489
 490    dst_format_desc = util_format_description(dst_format);
 491    src_format_desc = util_format_description(src_format);
 492
 493    if (util_is_format_compatible(src_format_desc, dst_format_desc)) {
 494       /*
 495        * Trivial case.
 496        */
 497
 498       util_copy_rect(dst, dst_format, dst_stride,  dst_x, dst_y,
 499                      width, height, src, (int)src_stride,
 500                      src_x, src_y);
 501       return;
 502    }
 503
 504    assert(dst_x % dst_format_desc->block.width == 0);
 505    assert(dst_y % dst_format_desc->block.height == 0);
 506    assert(src_x % src_format_desc->block.width == 0);
 507    assert(src_y % src_format_desc->block.height == 0);
 508
 509    dst_row = (uint8_t *)dst + dst_y*dst_stride + dst_x*(dst_format_desc->block.bits/8);
 510    src_row = (const uint8_t *)src + src_y*src_stride + src_x*(src_format_desc->block.bits/8);
 511
 512    /*
 513     * This works because all pixel formats have pixel blocks with power of two
 514     * sizes.
 515     */
 516
 517    y_step = MAX2(dst_format_desc->block.height, src_format_desc->block.height);
 518    x_step = MAX2(dst_format_desc->block.width, src_format_desc->block.width);
 519    assert(y_step % dst_format_desc->block.height == 0);
 520    assert(y_step % src_format_desc->block.height == 0);
 521
 522    dst_step = y_step / dst_format_desc->block.height * dst_stride;
 523    src_step = y_step / src_format_desc->block.height * src_stride;
 524
 525    /*
 526     * TODO: double formats will loose precision
 527     * TODO: Add a special case for formats that are mere swizzles of each other
 528     */
 529
 530    if (src_format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS ||
 531        dst_format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS) {
 532       float *tmp_z = NULL;
 533       uint8_t *tmp_s = NULL;
 534
 535       assert(x_step == 1);
 536       assert(y_step == 1);
 537
 538       if (src_format_desc->unpack_z_float &&
 539           dst_format_desc->pack_z_float) {
 540          tmp_z = MALLOC(width * sizeof *tmp_z);
 541       }
 542
 543       if (src_format_desc->unpack_s_8uint &&
 544           dst_format_desc->pack_s_8uint) {
 545          tmp_s = MALLOC(width * sizeof *tmp_s);
 546       }
 547
 548       while (height--) {
 549          if (tmp_z) {
 550             src_format_desc->unpack_z_float(tmp_z, 0, src_row, src_stride, width, 1);
 551             dst_format_desc->pack_z_float(dst_row, dst_stride, tmp_z, 0, width, 1);
 552          }
 553
 554          if (tmp_s) {
 555             src_format_desc->unpack_s_8uint(tmp_s, 0, src_row, src_stride, width, 1);
 556             dst_format_desc->pack_s_8uint(dst_row, dst_stride, tmp_s, 0, width, 1);
 557          }
 558
 559          dst_row += dst_step;
 560          src_row += src_step;
 561       }
 562
 563       FREE(tmp_s);
 564
 565       FREE(tmp_z);
 566
 567       return;
 568    }
 569
 570    if (util_format_fits_8unorm(src_format_desc) ||
 571        util_format_fits_8unorm(dst_format_desc)) {
 572       unsigned tmp_stride;
 573       uint8_t *tmp_row;
 574
 575       tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
 576       tmp_row = MALLOC(y_step * tmp_stride);
 577       if (!tmp_row)
 578          return;
 579
 580       while (height >= y_step) {
 581          src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 582          dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 583
 584          dst_row += dst_step;
 585          src_row += src_step;
 586          height -= y_step;
 587       }
 588
 589       if (height) {
 590          src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, height);
 591          dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 592       }
 593
 594       FREE(tmp_row);
 595    }
 596    else {
 597       unsigned tmp_stride;
 598       float *tmp_row;
 599
 600       tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
 601       tmp_row = MALLOC(y_step * tmp_stride);
 602       if (!tmp_row)
 603          return;
 604
 605       while (height >= y_step) {
 606          src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 607          dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 608
 609          dst_row += dst_step;
 610          src_row += src_step;
 611          height -= y_step;
 612       }
 613
 614       if (height) {
 615          src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, height);
 616          dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 617       }
 618
 619       FREE(tmp_row);
 620    }
 621 }
 622
 623 void util_format_compose_swizzles(const unsigned char swz1[4],
 624                                   const unsigned char swz2[4],
 625                                   unsigned char dst[4])
 626 {
 627    unsigned i;
 628
 629    for (i = 0; i < 4; i++) {
 630       dst[i] = swz2[i] <= UTIL_FORMAT_SWIZZLE_W ?
 631                swz1[swz2[i]] : swz2[i];
 632    }
 633 }
 634
 635 void util_format_apply_color_swizzle(union pipe_color_union *dst,
 636                                      const union pipe_color_union *src,
 637                                      const unsigned char swz[4],
 638                                      const boolean is_integer)
 639 {
 640    unsigned c;
 641
 642    if (is_integer) {
 643       for (c = 0; c < 4; ++c) {
 644          switch (swz[c]) {
 645          case PIPE_SWIZZLE_RED:   dst->ui[c] = src->ui[0]; break;
 646          case PIPE_SWIZZLE_GREEN: dst->ui[c] = src->ui[1]; break;
 647          case PIPE_SWIZZLE_BLUE:  dst->ui[c] = src->ui[2]; break;
 648          case PIPE_SWIZZLE_ALPHA: dst->ui[c] = src->ui[3]; break;
 649          default:
 650             dst->ui[c] = (swz[c] == PIPE_SWIZZLE_ONE) ? 1 : 0;
 651             break;
 652          }
 653       }
 654    } else {
 655       for (c = 0; c < 4; ++c) {
 656          switch (swz[c]) {
 657          case PIPE_SWIZZLE_RED:   dst->f[c] = src->f[0]; break;
 658          case PIPE_SWIZZLE_GREEN: dst->f[c] = src->f[1]; break;
 659          case PIPE_SWIZZLE_BLUE:  dst->f[c] = src->f[2]; break;
 660          case PIPE_SWIZZLE_ALPHA: dst->f[c] = src->f[3]; break;
 661          default:
 662             dst->f[c] = (swz[c] == PIPE_SWIZZLE_ONE) ? 1.0f : 0.0f;
 663             break;
 664          }
 665       }
 666    }
 667 }
 668
 669 void util_format_swizzle_4f(float *dst, const float *src,
 670                             const unsigned char swz[4])
 671 {
 672    unsigned i;
 673
 674    for (i = 0; i < 4; i++) {
 675       if (swz[i] <= UTIL_FORMAT_SWIZZLE_W)
 676          dst[i] = src[swz[i]];
 677       else if (swz[i] == UTIL_FORMAT_SWIZZLE_0)
 678          dst[i] = 0;
 679       else if (swz[i] == UTIL_FORMAT_SWIZZLE_1)
 680          dst[i] = 1;
 681    }
 682 }
 683
 684 void util_format_unswizzle_4f(float *dst, const float *src,
 685                               const unsigned char swz[4])
 686 {
 687    unsigned i;
 688
 689    for (i = 0; i < 4; i++) {
 690       switch (swz[i]) {
 691       case UTIL_FORMAT_SWIZZLE_X:
 692          dst[0] = src[i];
 693          break;
 694       case UTIL_FORMAT_SWIZZLE_Y:
 695          dst[1] = src[i];
 696          break;
 697       case UTIL_FORMAT_SWIZZLE_Z:
 698          dst[2] = src[i];
 699          break;
 700       case UTIL_FORMAT_SWIZZLE_W:
 701          dst[3] = src[i];
 702          break;
 703       }
 704    }
 705 }