reactos/dll/opengl/mesa/src/mesa/swrast/s_texfetch.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.7
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  * Copyright (c) 2009  VMware, Inc.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions 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 MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 /**
  28  * \file s_texfetch.c
  29  *
  30  * Texel fetch/store functions
  31  *
  32  * \author Gareth Hughes
  33  */
  34
  35
  36 #include "main/colormac.h"
  37 #include "main/macros.h"
  38 #include "main/teximage.h"
  39 #include "s_context.h"
  40 #include "s_texfetch.h"
  41
  42
  43 /**
  44  * Convert an 8-bit sRGB value from non-linear space to a
  45  * linear RGB value in [0, 1].
  46  * Implemented with a 256-entry lookup table.
  47  */
  48 static inline GLfloat
  49 nonlinear_to_linear(GLubyte cs8)
  50 {
  51    static GLfloat table[256];
  52    static GLboolean tableReady = GL_FALSE;
  53    if (!tableReady) {
  54       /* compute lookup table now */
  55       GLuint i;
  56       for (i = 0; i < 256; i++) {
  57          const GLfloat cs = UBYTE_TO_FLOAT(i);
  58          if (cs <= 0.04045) {
  59             table[i] = cs / 12.92f;
  60          }
  61          else {
  62             table[i] = (GLfloat) pow((cs + 0.055) / 1.055, 2.4);
  63          }
  64       }
  65       tableReady = GL_TRUE;
  66    }
  67    return table[cs8];
  68 }
  69
  70
  71
  72 /* Texel fetch routines for all supported formats
  73  */
  74 #define DIM 1
  75 #include "s_texfetch_tmp.h"
  76
  77 #define DIM 2
  78 #include "s_texfetch_tmp.h"
  79
  80 #define DIM 3
  81 #include "s_texfetch_tmp.h"
  82
  83 /**
  84  * Null texel fetch function.
  85  *
  86  * Have to have this so the FetchTexel function pointer is never NULL.
  87  */
  88 static void fetch_null_texelf( const struct swrast_texture_image *texImage,
  89                                GLint i, GLint j, GLint k, GLfloat *texel )
  90 {
  91    (void) texImage; (void) i; (void) j; (void) k;
  92    texel[RCOMP] = 0.0;
  93    texel[GCOMP] = 0.0;
  94    texel[BCOMP] = 0.0;
  95    texel[ACOMP] = 0.0;
  96    _mesa_warning(NULL, "fetch_null_texelf() called!");
  97 }
  98
  99
 100 /**
 101  * Table to map MESA_FORMAT_ to texel fetch/store funcs.
 102  * XXX this is somewhat temporary.
 103  */
 104 static struct {
 105    gl_format Name;
 106    FetchTexelFunc Fetch1D;
 107    FetchTexelFunc Fetch2D;
 108    FetchTexelFunc Fetch3D;
 109 }
 110 texfetch_funcs[MESA_FORMAT_COUNT] =
 111 {
 112    {
 113       MESA_FORMAT_NONE,
 114       fetch_null_texelf,
 115       fetch_null_texelf,
 116       fetch_null_texelf
 117    },
 118
 119    {
 120       MESA_FORMAT_RGBA8888,
 121       fetch_texel_1d_f_rgba8888,
 122       fetch_texel_2d_f_rgba8888,
 123       fetch_texel_3d_f_rgba8888
 124    },
 125    {
 126       MESA_FORMAT_RGBA8888_REV,
 127       fetch_texel_1d_f_rgba8888_rev,
 128       fetch_texel_2d_f_rgba8888_rev,
 129       fetch_texel_3d_f_rgba8888_rev
 130    },
 131    {
 132       MESA_FORMAT_ARGB8888,
 133       fetch_texel_1d_f_argb8888,
 134       fetch_texel_2d_f_argb8888,
 135       fetch_texel_3d_f_argb8888
 136    },
 137    {
 138       MESA_FORMAT_ARGB8888_REV,
 139       fetch_texel_1d_f_argb8888_rev,
 140       fetch_texel_2d_f_argb8888_rev,
 141       fetch_texel_3d_f_argb8888_rev
 142    },
 143    {
 144       MESA_FORMAT_RGBX8888,
 145       fetch_texel_1d_f_rgbx8888,
 146       fetch_texel_2d_f_rgbx8888,
 147       fetch_texel_3d_f_rgbx8888
 148    },
 149    {
 150       MESA_FORMAT_RGBX8888_REV,
 151       fetch_texel_1d_f_rgbx8888_rev,
 152       fetch_texel_2d_f_rgbx8888_rev,
 153       fetch_texel_3d_f_rgbx8888_rev
 154    },
 155    {
 156       MESA_FORMAT_XRGB8888,
 157       fetch_texel_1d_f_xrgb8888,
 158       fetch_texel_2d_f_xrgb8888,
 159       fetch_texel_3d_f_xrgb8888
 160    },
 161    {
 162       MESA_FORMAT_XRGB8888_REV,
 163       fetch_texel_1d_f_xrgb8888_rev,
 164       fetch_texel_2d_f_xrgb8888_rev,
 165       fetch_texel_3d_f_xrgb8888_rev
 166    },
 167    {
 168       MESA_FORMAT_RGB888,
 169       fetch_texel_1d_f_rgb888,
 170       fetch_texel_2d_f_rgb888,
 171       fetch_texel_3d_f_rgb888
 172    },
 173    {
 174       MESA_FORMAT_BGR888,
 175       fetch_texel_1d_f_bgr888,
 176       fetch_texel_2d_f_bgr888,
 177       fetch_texel_3d_f_bgr888
 178    },
 179    {
 180       MESA_FORMAT_RGB565,
 181       fetch_texel_1d_f_rgb565,
 182       fetch_texel_2d_f_rgb565,
 183       fetch_texel_3d_f_rgb565
 184    },
 185    {
 186       MESA_FORMAT_RGB565_REV,
 187       fetch_texel_1d_f_rgb565_rev,
 188       fetch_texel_2d_f_rgb565_rev,
 189       fetch_texel_3d_f_rgb565_rev
 190    },
 191    {
 192       MESA_FORMAT_ARGB4444,
 193       fetch_texel_1d_f_argb4444,
 194       fetch_texel_2d_f_argb4444,
 195       fetch_texel_3d_f_argb4444
 196    },
 197    {
 198       MESA_FORMAT_ARGB4444_REV,
 199       fetch_texel_1d_f_argb4444_rev,
 200       fetch_texel_2d_f_argb4444_rev,
 201       fetch_texel_3d_f_argb4444_rev
 202    },
 203    {
 204       MESA_FORMAT_RGBA5551,
 205       fetch_texel_1d_f_rgba5551,
 206       fetch_texel_2d_f_rgba5551,
 207       fetch_texel_3d_f_rgba5551
 208    },
 209    {
 210       MESA_FORMAT_ARGB1555,
 211       fetch_texel_1d_f_argb1555,
 212       fetch_texel_2d_f_argb1555,
 213       fetch_texel_3d_f_argb1555
 214    },
 215    {
 216       MESA_FORMAT_ARGB1555_REV,
 217       fetch_texel_1d_f_argb1555_rev,
 218       fetch_texel_2d_f_argb1555_rev,
 219       fetch_texel_3d_f_argb1555_rev
 220    },
 221    {
 222       MESA_FORMAT_AL44,
 223       fetch_texel_1d_f_al44,
 224       fetch_texel_2d_f_al44,
 225       fetch_texel_3d_f_al44
 226    },
 227    {
 228       MESA_FORMAT_AL88,
 229       fetch_texel_1d_f_al88,
 230       fetch_texel_2d_f_al88,
 231       fetch_texel_3d_f_al88
 232    },
 233    {
 234       MESA_FORMAT_AL88_REV,
 235       fetch_texel_1d_f_al88_rev,
 236       fetch_texel_2d_f_al88_rev,
 237       fetch_texel_3d_f_al88_rev
 238    },
 239    {
 240       MESA_FORMAT_AL1616,
 241       fetch_texel_1d_f_al1616,
 242       fetch_texel_2d_f_al1616,
 243       fetch_texel_3d_f_al1616
 244    },
 245    {
 246       MESA_FORMAT_AL1616_REV,
 247       fetch_texel_1d_f_al1616_rev,
 248       fetch_texel_2d_f_al1616_rev,
 249       fetch_texel_3d_f_al1616_rev
 250    },
 251    {
 252       MESA_FORMAT_RGB332,
 253       fetch_texel_1d_f_rgb332,
 254       fetch_texel_2d_f_rgb332,
 255       fetch_texel_3d_f_rgb332
 256    },
 257    {
 258       MESA_FORMAT_A8,
 259       fetch_texel_1d_f_a8,
 260       fetch_texel_2d_f_a8,
 261       fetch_texel_3d_f_a8
 262    },
 263    {
 264       MESA_FORMAT_A16,
 265       fetch_texel_1d_f_a16,
 266       fetch_texel_2d_f_a16,
 267       fetch_texel_3d_f_a16
 268    },
 269    {
 270       MESA_FORMAT_L8,
 271       fetch_texel_1d_f_l8,
 272       fetch_texel_2d_f_l8,
 273       fetch_texel_3d_f_l8
 274    },
 275    {
 276       MESA_FORMAT_L16,
 277       fetch_texel_1d_f_l16,
 278       fetch_texel_2d_f_l16,
 279       fetch_texel_3d_f_l16
 280    },
 281    {
 282       MESA_FORMAT_I8,
 283       fetch_texel_1d_f_i8,
 284       fetch_texel_2d_f_i8,
 285       fetch_texel_3d_f_i8
 286    },
 287    {
 288       MESA_FORMAT_I16,
 289       fetch_texel_1d_f_i16,
 290       fetch_texel_2d_f_i16,
 291       fetch_texel_3d_f_i16
 292    },
 293    {
 294       MESA_FORMAT_YCBCR,
 295       fetch_texel_1d_f_ycbcr,
 296       fetch_texel_2d_f_ycbcr,
 297       fetch_texel_3d_f_ycbcr
 298    },
 299    {
 300       MESA_FORMAT_YCBCR_REV,
 301       fetch_texel_1d_f_ycbcr_rev,
 302       fetch_texel_2d_f_ycbcr_rev,
 303       fetch_texel_3d_f_ycbcr_rev
 304    },
 305    {
 306       MESA_FORMAT_Z24_S8,
 307       fetch_texel_1d_f_z24_s8,
 308       fetch_texel_2d_f_z24_s8,
 309       fetch_texel_3d_f_z24_s8
 310    },
 311    {
 312       MESA_FORMAT_S8_Z24,
 313       fetch_texel_1d_f_s8_z24,
 314       fetch_texel_2d_f_s8_z24,
 315       fetch_texel_3d_f_s8_z24
 316    },
 317    {
 318       MESA_FORMAT_Z16,
 319       fetch_texel_1d_f_z16,
 320       fetch_texel_2d_f_z16,
 321       fetch_texel_3d_f_z16
 322    },
 323    {
 324       MESA_FORMAT_X8_Z24,
 325       fetch_texel_1d_f_s8_z24,
 326       fetch_texel_2d_f_s8_z24,
 327       fetch_texel_3d_f_s8_z24
 328    },
 329    {
 330       MESA_FORMAT_Z24_X8,
 331       fetch_texel_1d_f_z24_s8,
 332       fetch_texel_2d_f_z24_s8,
 333       fetch_texel_3d_f_z24_s8
 334    },
 335    {
 336       MESA_FORMAT_Z32,
 337       fetch_texel_1d_f_z32,
 338       fetch_texel_2d_f_z32,
 339       fetch_texel_3d_f_z32
 340    },
 341    {
 342       MESA_FORMAT_S8,
 343       NULL,
 344       NULL,
 345       NULL
 346    },
 347    {
 348       MESA_FORMAT_SRGB8,
 349       fetch_texel_1d_srgb8,
 350       fetch_texel_2d_srgb8,
 351       fetch_texel_3d_srgb8
 352    },
 353    {
 354       MESA_FORMAT_SRGBA8,
 355       fetch_texel_1d_srgba8,
 356       fetch_texel_2d_srgba8,
 357       fetch_texel_3d_srgba8
 358    },
 359    {
 360       MESA_FORMAT_SARGB8,
 361       fetch_texel_1d_sargb8,
 362       fetch_texel_2d_sargb8,
 363       fetch_texel_3d_sargb8
 364    },
 365    {
 366       MESA_FORMAT_SL8,
 367       fetch_texel_1d_sl8,
 368       fetch_texel_2d_sl8,
 369       fetch_texel_3d_sl8
 370    },
 371    {
 372       MESA_FORMAT_SLA8,
 373       fetch_texel_1d_sla8,
 374       fetch_texel_2d_sla8,
 375       fetch_texel_3d_sla8
 376    },
 377    {
 378       MESA_FORMAT_RGBA_FLOAT32,
 379       fetch_texel_1d_f_rgba_f32,
 380       fetch_texel_2d_f_rgba_f32,
 381       fetch_texel_3d_f_rgba_f32
 382    },
 383    {
 384       MESA_FORMAT_RGBA_FLOAT16,
 385       fetch_texel_1d_f_rgba_f16,
 386       fetch_texel_2d_f_rgba_f16,
 387       fetch_texel_3d_f_rgba_f16
 388    },
 389    {
 390       MESA_FORMAT_RGB_FLOAT32,
 391       fetch_texel_1d_f_rgb_f32,
 392       fetch_texel_2d_f_rgb_f32,
 393       fetch_texel_3d_f_rgb_f32
 394    },
 395    {
 396       MESA_FORMAT_RGB_FLOAT16,
 397       fetch_texel_1d_f_rgb_f16,
 398       fetch_texel_2d_f_rgb_f16,
 399       fetch_texel_3d_f_rgb_f16
 400    },
 401    {
 402       MESA_FORMAT_ALPHA_FLOAT32,
 403       fetch_texel_1d_f_alpha_f32,
 404       fetch_texel_2d_f_alpha_f32,
 405       fetch_texel_3d_f_alpha_f32
 406    },
 407    {
 408       MESA_FORMAT_ALPHA_FLOAT16,
 409       fetch_texel_1d_f_alpha_f16,
 410       fetch_texel_2d_f_alpha_f16,
 411       fetch_texel_3d_f_alpha_f16
 412    },
 413    {
 414       MESA_FORMAT_LUMINANCE_FLOAT32,
 415       fetch_texel_1d_f_luminance_f32,
 416       fetch_texel_2d_f_luminance_f32,
 417       fetch_texel_3d_f_luminance_f32
 418    },
 419    {
 420       MESA_FORMAT_LUMINANCE_FLOAT16,
 421       fetch_texel_1d_f_luminance_f16,
 422       fetch_texel_2d_f_luminance_f16,
 423       fetch_texel_3d_f_luminance_f16
 424    },
 425    {
 426       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32,
 427       fetch_texel_1d_f_luminance_alpha_f32,
 428       fetch_texel_2d_f_luminance_alpha_f32,
 429       fetch_texel_3d_f_luminance_alpha_f32
 430    },
 431    {
 432       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16,
 433       fetch_texel_1d_f_luminance_alpha_f16,
 434       fetch_texel_2d_f_luminance_alpha_f16,
 435       fetch_texel_3d_f_luminance_alpha_f16
 436    },
 437    {
 438       MESA_FORMAT_INTENSITY_FLOAT32,
 439       fetch_texel_1d_f_intensity_f32,
 440       fetch_texel_2d_f_intensity_f32,
 441       fetch_texel_3d_f_intensity_f32
 442    },
 443    {
 444       MESA_FORMAT_INTENSITY_FLOAT16,
 445       fetch_texel_1d_f_intensity_f16,
 446       fetch_texel_2d_f_intensity_f16,
 447       fetch_texel_3d_f_intensity_f16
 448    },
 449
 450    {
 451       MESA_FORMAT_ALPHA_UINT8,
 452       NULL,
 453       NULL,
 454       NULL
 455    },
 456
 457    {
 458       MESA_FORMAT_ALPHA_UINT16,
 459       NULL,
 460       NULL,
 461       NULL
 462    },
 463
 464    {
 465       MESA_FORMAT_ALPHA_UINT32,
 466       NULL,
 467       NULL,
 468       NULL
 469    },
 470
 471    {
 472       MESA_FORMAT_ALPHA_INT8,
 473       NULL,
 474       NULL,
 475       NULL
 476    },
 477
 478    {
 479       MESA_FORMAT_ALPHA_INT16,
 480       NULL,
 481       NULL,
 482       NULL
 483    },
 484
 485    {
 486       MESA_FORMAT_ALPHA_INT32,
 487       NULL,
 488       NULL,
 489       NULL
 490    },
 491
 492
 493    {
 494       MESA_FORMAT_INTENSITY_UINT8,
 495       NULL,
 496       NULL,
 497       NULL
 498    },
 499
 500    {
 501       MESA_FORMAT_INTENSITY_UINT16,
 502       NULL,
 503       NULL,
 504       NULL
 505    },
 506
 507    {
 508       MESA_FORMAT_INTENSITY_UINT32,
 509       NULL,
 510       NULL,
 511       NULL
 512    },
 513
 514    {
 515       MESA_FORMAT_INTENSITY_INT8,
 516       NULL,
 517       NULL,
 518       NULL
 519    },
 520
 521    {
 522       MESA_FORMAT_INTENSITY_INT16,
 523       NULL,
 524       NULL,
 525       NULL
 526    },
 527
 528    {
 529       MESA_FORMAT_INTENSITY_INT32,
 530       NULL,
 531       NULL,
 532       NULL
 533    },
 534
 535
 536    {
 537       MESA_FORMAT_LUMINANCE_UINT8,
 538       NULL,
 539       NULL,
 540       NULL
 541    },
 542
 543    {
 544       MESA_FORMAT_LUMINANCE_UINT16,
 545       NULL,
 546       NULL,
 547       NULL
 548    },
 549
 550    {
 551       MESA_FORMAT_LUMINANCE_UINT32,
 552       NULL,
 553       NULL,
 554       NULL
 555    },
 556
 557    {
 558       MESA_FORMAT_LUMINANCE_INT8,
 559       NULL,
 560       NULL,
 561       NULL
 562    },
 563
 564    {
 565       MESA_FORMAT_LUMINANCE_INT16,
 566       NULL,
 567       NULL,
 568       NULL
 569    },
 570
 571    {
 572       MESA_FORMAT_LUMINANCE_INT32,
 573       NULL,
 574       NULL,
 575       NULL
 576    },
 577
 578
 579    {
 580       MESA_FORMAT_LUMINANCE_ALPHA_UINT8,
 581       NULL,
 582       NULL,
 583       NULL
 584    },
 585
 586    {
 587       MESA_FORMAT_LUMINANCE_ALPHA_UINT16,
 588       NULL,
 589       NULL,
 590       NULL
 591    },
 592
 593    {
 594       MESA_FORMAT_LUMINANCE_ALPHA_UINT32,
 595       NULL,
 596       NULL,
 597       NULL
 598    },
 599
 600    {
 601       MESA_FORMAT_LUMINANCE_ALPHA_INT8,
 602       NULL,
 603       NULL,
 604       NULL
 605    },
 606
 607    {
 608       MESA_FORMAT_LUMINANCE_ALPHA_INT16,
 609       NULL,
 610       NULL,
 611       NULL
 612    },
 613
 614    {
 615       MESA_FORMAT_LUMINANCE_ALPHA_INT32,
 616       NULL,
 617       NULL,
 618       NULL
 619    },
 620
 621    {
 622       MESA_FORMAT_RGB_INT8,
 623       NULL,
 624       NULL,
 625       NULL
 626    },
 627
 628    /* non-normalized, signed int */
 629    {
 630       MESA_FORMAT_RGBA_INT8,
 631       fetch_texel_1d_rgba_int8,
 632       fetch_texel_2d_rgba_int8,
 633       fetch_texel_3d_rgba_int8
 634    },
 635    {
 636       MESA_FORMAT_RGB_INT16,
 637       NULL,
 638       NULL,
 639       NULL
 640    },
 641    {
 642       MESA_FORMAT_RGBA_INT16,
 643       fetch_texel_1d_rgba_int16,
 644       fetch_texel_2d_rgba_int16,
 645       fetch_texel_3d_rgba_int16
 646    },
 647    {
 648       MESA_FORMAT_RGB_INT32,
 649       NULL,
 650       NULL,
 651       NULL
 652    },
 653    {
 654       MESA_FORMAT_RGBA_INT32,
 655       fetch_texel_1d_rgba_int32,
 656       fetch_texel_2d_rgba_int32,
 657       fetch_texel_3d_rgba_int32
 658    },
 659
 660    /* non-normalized, unsigned int */
 661    {
 662       MESA_FORMAT_RGB_UINT8,
 663       NULL,
 664       NULL,
 665       NULL
 666    },
 667    {
 668       MESA_FORMAT_RGBA_UINT8,
 669       fetch_texel_1d_rgba_uint8,
 670       fetch_texel_2d_rgba_uint8,
 671       fetch_texel_3d_rgba_uint8
 672    },
 673    {
 674       MESA_FORMAT_RGB_UINT16,
 675       NULL,
 676       NULL,
 677       NULL
 678    },
 679    {
 680       MESA_FORMAT_RGBA_UINT16,
 681       fetch_texel_1d_rgba_uint16,
 682       fetch_texel_2d_rgba_uint16,
 683       fetch_texel_3d_rgba_uint16
 684    },
 685    {
 686       MESA_FORMAT_RGB_UINT32,
 687       NULL,
 688       NULL,
 689       NULL
 690    },
 691    {
 692       MESA_FORMAT_RGBA_UINT32,
 693       fetch_texel_1d_rgba_uint32,
 694       fetch_texel_2d_rgba_uint32,
 695       fetch_texel_3d_rgba_uint32
 696    },
 697
 698    /* dudv */
 699    {
 700       MESA_FORMAT_DUDV8,
 701       fetch_texel_1d_dudv8,
 702       fetch_texel_2d_dudv8,
 703       fetch_texel_3d_dudv8
 704    },
 705
 706    /* signed, normalized */
 707    {
 708       MESA_FORMAT_SIGNED_RGBA_16,
 709       fetch_texel_1d_signed_rgba_16,
 710       fetch_texel_2d_signed_rgba_16,
 711       fetch_texel_3d_signed_rgba_16
 712    },
 713    {
 714       MESA_FORMAT_RGBA_16,
 715       fetch_texel_1d_rgba_16,
 716       fetch_texel_2d_rgba_16,
 717       fetch_texel_3d_rgba_16
 718    },
 719    {
 720       MESA_FORMAT_Z32_FLOAT,
 721       fetch_texel_1d_f_r_f32, /* Reuse the R32F functions. */
 722       fetch_texel_2d_f_r_f32,
 723       fetch_texel_3d_f_r_f32
 724    },
 725    {
 726       MESA_FORMAT_Z32_FLOAT_X24S8,
 727       fetch_texel_1d_z32f_x24s8,
 728       fetch_texel_2d_z32f_x24s8,
 729       fetch_texel_3d_z32f_x24s8
 730    }
 731 };
 732
 733
 734 FetchTexelFunc
 735 _mesa_get_texel_fetch_func(gl_format format, GLuint dims)
 736 {
 737 #ifdef DEBUG
 738    /* check that the table entries are sorted by format name */
 739    gl_format fmt;
 740    for (fmt = 0; fmt < MESA_FORMAT_COUNT; fmt++) {
 741       assert(texfetch_funcs[fmt].Name == fmt);
 742    }
 743 #endif
 744
 745    STATIC_ASSERT(Elements(texfetch_funcs) == MESA_FORMAT_COUNT);
 746
 747    assert(format < MESA_FORMAT_COUNT);
 748
 749    switch (dims) {
 750    case 1:
 751       return texfetch_funcs[format].Fetch1D;
 752    case 2:
 753       return texfetch_funcs[format].Fetch2D;
 754    case 3:
 755       return texfetch_funcs[format].Fetch3D;
 756    default:
 757       assert(0 && "bad dims in _mesa_get_texel_fetch_func");
 758       return NULL;
 759    }
 760 }
 761
 762
 763 /**
 764  * Initialize the texture image's FetchTexel methods.
 765  */
 766 static void
 767 set_fetch_functions(struct swrast_texture_image *texImage, GLuint dims)
 768 {
 769    gl_format format = texImage->Base.TexFormat;
 770
 771    ASSERT(dims == 1 || dims == 2 || dims == 3);
 772
 773    if (_mesa_get_format_color_encoding(format) == GL_SRGB) {
 774       format = _mesa_get_srgb_format_linear(format);
 775    }
 776
 777    texImage->FetchTexel = _mesa_get_texel_fetch_func(format, dims);
 778    ASSERT(texImage->FetchTexel);
 779 }
 780
 781 void
 782 _mesa_update_fetch_functions(struct gl_texture_object *texObj)
 783 {
 784    GLuint face, i;
 785    GLuint dims;
 786
 787    dims = _mesa_get_texture_dimensions(texObj->Target);
 788
 789    for (face = 0; face < 6; face++) {
 790       for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
 791          if (texObj->Image[face][i]) {
 792             set_fetch_functions(swrast_texture_image(texObj->Image[face][i]),
 793                                 dims);
 794          }
 795       }
 796    }
 797 }