src/gallium/auxiliary/util/u_pack_color.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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  * Functions to produce packed colors/Z from floats.
  31  */
  32
  33
  34 #ifndef U_PACK_COLOR_H
  35 #define U_PACK_COLOR_H
  36
  37
  38 #include "pipe/p_compiler.h"
  39 #include "pipe/p_format.h"
  40 #include "util/u_debug.h"
  41 #include "util/u_format.h"
  42 #include "util/u_math.h"
  43
  44
  45 /**
  46  * Helper union for packing pixel values.
  47  * Will often contain values in formats which are too complex to be described
  48  * in simple terms, hence might just effectively contain a number of bytes.
  49  * Must be big enough to hold data for all formats (currently 256 bits).
  50  */
  51 union util_color {
  52    ubyte ub;
  53    ushort us;
  54    uint ui;
  55    float f[4];
  56    double d[4];
  57 };
  58
  59 /**
  60  * Pack ubyte R,G,B,A into dest pixel.
  61  */
  62 static INLINE void
  63 util_pack_color_ub(ubyte r, ubyte g, ubyte b, ubyte a,
  64                    enum pipe_format format, union util_color *uc)
  65 {
  66    switch (format) {
  67    case PIPE_FORMAT_A8B8G8R8_UNORM:
  68       {
  69          uc->ui = (r << 24) | (g << 16) | (b << 8) | a;
  70       }
  71       return;
  72    case PIPE_FORMAT_X8B8G8R8_UNORM:
  73       {
  74          uc->ui = (r << 24) | (g << 16) | (b << 8) | 0xff;
  75       }
  76       return;
  77    case PIPE_FORMAT_B8G8R8A8_UNORM:
  78       {
  79          uc->ui = (a << 24) | (r << 16) | (g << 8) | b;
  80       }
  81       return;
  82    case PIPE_FORMAT_B8G8R8X8_UNORM:
  83       {
  84          uc->ui = (0xff << 24) | (r << 16) | (g << 8) | b;
  85       }
  86       return;
  87    case PIPE_FORMAT_A8R8G8B8_UNORM:
  88       {
  89          uc->ui = (b << 24) | (g << 16) | (r << 8) | a;
  90       }
  91       return;
  92    case PIPE_FORMAT_X8R8G8B8_UNORM:
  93       {
  94          uc->ui = (b << 24) | (g << 16) | (r << 8) | 0xff;
  95       }
  96       return;
  97    case PIPE_FORMAT_B5G6R5_UNORM:
  98       {
  99          uc->us = ((r & 0xf8) << 8) | ((g & 0xfc) << 3) | (b >> 3);
 100       }
 101       return;
 102    case PIPE_FORMAT_B5G5R5X1_UNORM:
 103       {
 104          uc->us = ((0x80) << 8) | ((r & 0xf8) << 7) | ((g & 0xf8) << 2) | (b >> 3);
 105       }
 106       return;
 107    case PIPE_FORMAT_B5G5R5A1_UNORM:
 108       {
 109          uc->us = ((a & 0x80) << 8) | ((r & 0xf8) << 7) | ((g & 0xf8) << 2) | (b >> 3);
 110       }
 111       return;
 112    case PIPE_FORMAT_B4G4R4A4_UNORM:
 113       {
 114          uc->us = ((a & 0xf0) << 8) | ((r & 0xf0) << 4) | ((g & 0xf0) << 0) | (b >> 4);
 115       }
 116       return;
 117    case PIPE_FORMAT_A8_UNORM:
 118       {
 119          uc->ub = a;
 120       }
 121       return;
 122    case PIPE_FORMAT_L8_UNORM:
 123    case PIPE_FORMAT_I8_UNORM:
 124       {
 125          uc->ub = a;
 126       }
 127       return;
 128    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 129       {
 130          uc->f[0] = (float)r / 255.0f;
 131          uc->f[1] = (float)g / 255.0f;
 132          uc->f[2] = (float)b / 255.0f;
 133          uc->f[3] = (float)a / 255.0f;
 134       }
 135       return;
 136    case PIPE_FORMAT_R32G32B32_FLOAT:
 137       {
 138          uc->f[0] = (float)r / 255.0f;
 139          uc->f[1] = (float)g / 255.0f;
 140          uc->f[2] = (float)b / 255.0f;
 141       }
 142       return;
 143
 144    /* Handle other cases with a generic function.
 145     */
 146    default:
 147       {
 148          ubyte src[4];
 149
 150          src[0] = r;
 151          src[1] = g;
 152          src[2] = b;
 153          src[3] = a;
 154          util_format_write_4ub(format, src, 0, uc, 0, 0, 0, 1, 1);
 155       }
 156    }
 157 }
 158
 159
 160 /**
 161  * Unpack RGBA from a packed pixel, returning values as ubytes in [0,255].
 162  */
 163 static INLINE void
 164 util_unpack_color_ub(enum pipe_format format, union util_color *uc,
 165                      ubyte *r, ubyte *g, ubyte *b, ubyte *a)
 166 {
 167    switch (format) {
 168    case PIPE_FORMAT_A8B8G8R8_UNORM:
 169       {
 170          uint p = uc->ui;
 171          *r = (ubyte) ((p >> 24) & 0xff);
 172          *g = (ubyte) ((p >> 16) & 0xff);
 173          *b = (ubyte) ((p >>  8) & 0xff);
 174          *a = (ubyte) ((p >>  0) & 0xff);
 175       }
 176       return;
 177    case PIPE_FORMAT_X8B8G8R8_UNORM:
 178       {
 179          uint p = uc->ui;
 180          *r = (ubyte) ((p >> 24) & 0xff);
 181          *g = (ubyte) ((p >> 16) & 0xff);
 182          *b = (ubyte) ((p >>  8) & 0xff);
 183          *a = (ubyte) 0xff;
 184       }
 185       return;
 186    case PIPE_FORMAT_B8G8R8A8_UNORM:
 187       {
 188          uint p = uc->ui;
 189          *r = (ubyte) ((p >> 16) & 0xff);
 190          *g = (ubyte) ((p >>  8) & 0xff);
 191          *b = (ubyte) ((p >>  0) & 0xff);
 192          *a = (ubyte) ((p >> 24) & 0xff);
 193       }
 194       return;
 195    case PIPE_FORMAT_B8G8R8X8_UNORM:
 196       {
 197          uint p = uc->ui;
 198          *r = (ubyte) ((p >> 16) & 0xff);
 199          *g = (ubyte) ((p >>  8) & 0xff);
 200          *b = (ubyte) ((p >>  0) & 0xff);
 201          *a = (ubyte) 0xff;
 202       }
 203       return;
 204    case PIPE_FORMAT_A8R8G8B8_UNORM:
 205       {
 206          uint p = uc->ui;
 207          *r = (ubyte) ((p >>  8) & 0xff);
 208          *g = (ubyte) ((p >> 16) & 0xff);
 209          *b = (ubyte) ((p >> 24) & 0xff);
 210          *a = (ubyte) ((p >>  0) & 0xff);
 211       }
 212       return;
 213    case PIPE_FORMAT_X8R8G8B8_UNORM:
 214       {
 215          uint p = uc->ui;
 216          *r = (ubyte) ((p >>  8) & 0xff);
 217          *g = (ubyte) ((p >> 16) & 0xff);
 218          *b = (ubyte) ((p >> 24) & 0xff);
 219          *a = (ubyte) 0xff;
 220       }
 221       return;
 222    case PIPE_FORMAT_B5G6R5_UNORM:
 223       {
 224          ushort p = uc->us;
 225          *r = (ubyte) (((p >> 8) & 0xf8) | ((p >> 13) & 0x7));
 226          *g = (ubyte) (((p >> 3) & 0xfc) | ((p >>  9) & 0x3));
 227          *b = (ubyte) (((p << 3) & 0xf8) | ((p >>  2) & 0x7));
 228          *a = (ubyte) 0xff;
 229       }
 230       return;
 231    case PIPE_FORMAT_B5G5R5X1_UNORM:
 232       {
 233          ushort p = uc->us;
 234          *r = (ubyte) (((p >>  7) & 0xf8) | ((p >> 12) & 0x7));
 235          *g = (ubyte) (((p >>  2) & 0xf8) | ((p >>  7) & 0x7));
 236          *b = (ubyte) (((p <<  3) & 0xf8) | ((p >>  2) & 0x7));
 237          *a = (ubyte) 0xff;
 238       }
 239       return;
 240    case PIPE_FORMAT_B5G5R5A1_UNORM:
 241       {
 242          ushort p = uc->us;
 243          *r = (ubyte) (((p >>  7) & 0xf8) | ((p >> 12) & 0x7));
 244          *g = (ubyte) (((p >>  2) & 0xf8) | ((p >>  7) & 0x7));
 245          *b = (ubyte) (((p <<  3) & 0xf8) | ((p >>  2) & 0x7));
 246          *a = (ubyte) (0xff * (p >> 15));
 247       }
 248       return;
 249    case PIPE_FORMAT_B4G4R4A4_UNORM:
 250       {
 251          ushort p = uc->us;
 252          *r = (ubyte) (((p >> 4) & 0xf0) | ((p >>  8) & 0xf));
 253          *g = (ubyte) (((p >> 0) & 0xf0) | ((p >>  4) & 0xf));
 254          *b = (ubyte) (((p << 4) & 0xf0) | ((p >>  0) & 0xf));
 255          *a = (ubyte) (((p >> 8) & 0xf0) | ((p >> 12) & 0xf));
 256       }
 257       return;
 258    case PIPE_FORMAT_A8_UNORM:
 259       {
 260          ubyte p = uc->ub;
 261          *r = *g = *b = (ubyte) 0xff;
 262          *a = p;
 263       }
 264       return;
 265    case PIPE_FORMAT_L8_UNORM:
 266       {
 267          ubyte p = uc->ub;
 268          *r = *g = *b = p;
 269          *a = (ubyte) 0xff;
 270       }
 271       return;
 272    case PIPE_FORMAT_I8_UNORM:
 273       {
 274          ubyte p = uc->ub;
 275          *r = *g = *b = *a = p;
 276       }
 277       return;
 278    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 279       {
 280          const float *p = &uc->f[0];
 281          *r = float_to_ubyte(p[0]);
 282          *g = float_to_ubyte(p[1]);
 283          *b = float_to_ubyte(p[2]);
 284          *a = float_to_ubyte(p[3]);
 285       }
 286       return;
 287    case PIPE_FORMAT_R32G32B32_FLOAT:
 288       {
 289          const float *p = &uc->f[0];
 290          *r = float_to_ubyte(p[0]);
 291          *g = float_to_ubyte(p[1]);
 292          *b = float_to_ubyte(p[2]);
 293          *a = (ubyte) 0xff;
 294       }
 295       return;
 296
 297    case PIPE_FORMAT_R32G32_FLOAT:
 298       {
 299          const float *p = &uc->f[0];
 300          *r = float_to_ubyte(p[0]);
 301          *g = float_to_ubyte(p[1]);
 302          *b = *a = (ubyte) 0xff;
 303       }
 304       return;
 305
 306    case PIPE_FORMAT_R32_FLOAT:
 307       {
 308          const float *p = &uc->f[0];
 309          *r = float_to_ubyte(p[0]);
 310          *g = *b = *a = (ubyte) 0xff;
 311       }
 312       return;
 313
 314    /* Handle other cases with a generic function.
 315     */
 316    default:
 317       {
 318          ubyte dst[4];
 319
 320          util_format_read_4ub(format, dst, 0, uc, 0, 0, 0, 1, 1);
 321          *r = dst[0];
 322          *g = dst[1];
 323          *b = dst[2];
 324          *a = dst[3];
 325       }
 326    }
 327 }
 328
 329
 330 /**
 331  * Note rgba outside [0,1] will be clamped for int pixel formats.
 332  */
 333 static INLINE void
 334 util_pack_color(const float rgba[4], enum pipe_format format, union util_color *uc)
 335 {
 336    ubyte r = 0;
 337    ubyte g = 0;
 338    ubyte b = 0;
 339    ubyte a = 0;
 340
 341    if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0) <= 8) {
 342       /* format uses 8-bit components or less */
 343       r = float_to_ubyte(rgba[0]);
 344       g = float_to_ubyte(rgba[1]);
 345       b = float_to_ubyte(rgba[2]);
 346       a = float_to_ubyte(rgba[3]);
 347    }
 348
 349    switch (format) {
 350    case PIPE_FORMAT_A8B8G8R8_UNORM:
 351       {
 352          uc->ui = (r << 24) | (g << 16) | (b << 8) | a;
 353       }
 354       return;
 355    case PIPE_FORMAT_X8B8G8R8_UNORM:
 356       {
 357          uc->ui = (r << 24) | (g << 16) | (b << 8) | 0xff;
 358       }
 359       return;
 360    case PIPE_FORMAT_B8G8R8A8_UNORM:
 361       {
 362          uc->ui = (a << 24) | (r << 16) | (g << 8) | b;
 363       }
 364       return;
 365    case PIPE_FORMAT_B8G8R8X8_UNORM:
 366       {
 367          uc->ui = (0xff << 24) | (r << 16) | (g << 8) | b;
 368       }
 369       return;
 370    case PIPE_FORMAT_A8R8G8B8_UNORM:
 371       {
 372          uc->ui = (b << 24) | (g << 16) | (r << 8) | a;
 373       }
 374       return;
 375    case PIPE_FORMAT_X8R8G8B8_UNORM:
 376       {
 377          uc->ui = (b << 24) | (g << 16) | (r << 8) | 0xff;
 378       }
 379       return;
 380    case PIPE_FORMAT_B5G6R5_UNORM:
 381       {
 382          uc->us = ((r & 0xf8) << 8) | ((g & 0xfc) << 3) | (b >> 3);
 383       }
 384       return;
 385    case PIPE_FORMAT_B5G5R5X1_UNORM:
 386       {
 387          uc->us = ((0x80) << 8) | ((r & 0xf8) << 7) | ((g & 0xf8) << 2) | (b >> 3);
 388       }
 389       return;
 390    case PIPE_FORMAT_B5G5R5A1_UNORM:
 391       {
 392          uc->us = ((a & 0x80) << 8) | ((r & 0xf8) << 7) | ((g & 0xf8) << 2) | (b >> 3);
 393       }
 394       return;
 395    case PIPE_FORMAT_B4G4R4A4_UNORM:
 396       {
 397          uc->us = ((a & 0xf0) << 8) | ((r & 0xf0) << 4) | ((g & 0xf0) << 0) | (b >> 4);
 398       }
 399       return;
 400    case PIPE_FORMAT_A8_UNORM:
 401       {
 402          uc->ub = a;
 403       }
 404       return;
 405    case PIPE_FORMAT_L8_UNORM:
 406    case PIPE_FORMAT_I8_UNORM:
 407       {
 408          uc->ub = r;
 409       }
 410       return;
 411    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 412       {
 413          uc->f[0] = rgba[0];
 414          uc->f[1] = rgba[1];
 415          uc->f[2] = rgba[2];
 416          uc->f[3] = rgba[3];
 417       }
 418       return;
 419    case PIPE_FORMAT_R32G32B32_FLOAT:
 420       {
 421          uc->f[0] = rgba[0];
 422          uc->f[1] = rgba[1];
 423          uc->f[2] = rgba[2];
 424       }
 425       return;
 426
 427    /* Handle other cases with a generic function.
 428     */
 429    default:
 430       util_format_write_4f(format, rgba, 0, uc, 0, 0, 0, 1, 1);
 431    }
 432 }
 433
 434 /* Integer versions of util_pack_z and util_pack_z_stencil - useful for
 435  * constructing clear masks.
 436  */
 437 static INLINE uint32_t
 438 util_pack_mask_z(enum pipe_format format, uint32_t z)
 439 {
 440    switch (format) {
 441    case PIPE_FORMAT_Z16_UNORM:
 442       return z & 0xffff;
 443    case PIPE_FORMAT_Z32_UNORM:
 444    case PIPE_FORMAT_Z32_FLOAT:
 445       return z;
 446    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 447    case PIPE_FORMAT_Z24X8_UNORM:
 448       return z & 0xffffff;
 449    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 450    case PIPE_FORMAT_X8Z24_UNORM:
 451       return (z & 0xffffff) << 8;
 452    case PIPE_FORMAT_S8_USCALED:
 453       return 0;
 454    default:
 455       debug_print_format("gallium: unhandled format in util_pack_mask_z()", format);
 456       assert(0);
 457       return 0;
 458    }
 459 }
 460
 461 static INLINE uint32_t
 462 util_pack_mask_z_stencil(enum pipe_format format, uint32_t z, uint8_t s)
 463 {
 464    uint32_t packed = util_pack_mask_z(format, z);
 465
 466    switch (format) {
 467    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 468       packed |= (uint32_t)s << 24;
 469       break;
 470    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 471       packed |= s;
 472       break;
 473    case PIPE_FORMAT_S8_USCALED:
 474       packed |= s;
 475       break;
 476    default:
 477       break;
 478    }
 479
 480    return packed;
 481 }
 482
 483
 484
 485 /**
 486  * Note: it's assumed that z is in [0,1]
 487  */
 488 static INLINE uint32_t
 489 util_pack_z(enum pipe_format format, double z)
 490 {
 491    union fi fui;
 492
 493    if (z == 0.0)
 494       return 0;
 495
 496    switch (format) {
 497    case PIPE_FORMAT_Z16_UNORM:
 498       if (z == 1.0)
 499          return 0xffff;
 500       return (uint32_t) (z * 0xffff);
 501    case PIPE_FORMAT_Z32_UNORM:
 502       /* special-case to avoid overflow */
 503       if (z == 1.0)
 504          return 0xffffffff;
 505       return (uint32_t) (z * 0xffffffff);
 506    case PIPE_FORMAT_Z32_FLOAT:
 507       fui.f = (float)z;
 508       return fui.ui;
 509    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 510    case PIPE_FORMAT_Z24X8_UNORM:
 511       if (z == 1.0)
 512          return 0xffffff;
 513       return (uint32_t) (z * 0xffffff);
 514    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 515    case PIPE_FORMAT_X8Z24_UNORM:
 516       if (z == 1.0)
 517          return 0xffffff00;
 518       return ((uint32_t) (z * 0xffffff)) << 8;
 519    case PIPE_FORMAT_S8_USCALED:
 520       /* this case can get it via util_pack_z_stencil() */
 521       return 0;
 522    default:
 523       debug_print_format("gallium: unhandled format in util_pack_z()", format);
 524       assert(0);
 525       return 0;
 526    }
 527 }
 528
 529
 530 /**
 531  * Pack Z and/or stencil values into a 32-bit value described by format.
 532  * Note: it's assumed that z is in [0,1] and s in [0,255]
 533  */
 534 static INLINE uint32_t
 535 util_pack_z_stencil(enum pipe_format format, double z, uint8_t s)
 536 {
 537    uint32_t packed = util_pack_z(format, z);
 538
 539    switch (format) {
 540    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 541       packed |= (uint32_t)s << 24;
 542       break;
 543    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 544       packed |= s;
 545       break;
 546    case PIPE_FORMAT_S8_USCALED:
 547       packed |= s;
 548       break;
 549    default:
 550       break;
 551    }
 552
 553    return packed;
 554 }
 555
 556
 557 /**
 558  * Pack 4 ubytes into a 4-byte word
 559  */
 560 static INLINE unsigned
 561 pack_ub4(ubyte b0, ubyte b1, ubyte b2, ubyte b3)
 562 {
 563    return ((((unsigned int)b0) << 0) |
 564            (((unsigned int)b1) << 8) |
 565            (((unsigned int)b2) << 16) |
 566            (((unsigned int)b3) << 24));
 567 }
 568
 569
 570 /**
 571  * Pack/convert 4 floats into one 4-byte word.
 572  */
 573 static INLINE unsigned
 574 pack_ui32_float4(float a, float b, float c, float d)
 575 {
 576    return pack_ub4( float_to_ubyte(a),
 577                     float_to_ubyte(b),
 578                     float_to_ubyte(c),
 579                     float_to_ubyte(d) );
 580 }
 581
 582
 583
 584 #endif /* U_PACK_COLOR_H */