src/mesa/swrast/s_texfetch.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (c) 2009  VMware, Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * 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/texcompress.h"
  39 #include "main/texcompress_fxt1.h"
  40 #include "main/texcompress_s3tc.h"
  41 #include "main/texcompress_rgtc.h"
  42 #include "main/texcompress_etc.h"
  43 #include "main/teximage.h"
  44 #include "main/samplerobj.h"
  45 #include "s_context.h"
  46 #include "s_texfetch.h"
  47 #include "../../gallium/auxiliary/util/u_format_rgb9e5.h"
  48 #include "../../gallium/auxiliary/util/u_format_r11g11b10f.h"
  49
  50
  51 /**
  52  * Convert an 8-bit sRGB value from non-linear space to a
  53  * linear RGB value in [0, 1].
  54  * Implemented with a 256-entry lookup table.
  55  */
  56 static inline GLfloat
  57 nonlinear_to_linear(GLubyte cs8)
  58 {
  59    static GLfloat table[256];
  60    static GLboolean tableReady = GL_FALSE;
  61    if (!tableReady) {
  62       /* compute lookup table now */
  63       GLuint i;
  64       for (i = 0; i < 256; i++) {
  65          const GLfloat cs = UBYTE_TO_FLOAT(i);
  66          if (cs <= 0.04045) {
  67             table[i] = cs / 12.92f;
  68          }
  69          else {
  70             table[i] = (GLfloat) pow((cs + 0.055) / 1.055, 2.4);
  71          }
  72       }
  73       tableReady = GL_TRUE;
  74    }
  75    return table[cs8];
  76 }
  77
  78
  79
  80 /* Texel fetch routines for all supported formats
  81  */
  82 #define DIM 1
  83 #include "s_texfetch_tmp.h"
  84
  85 #define DIM 2
  86 #include "s_texfetch_tmp.h"
  87
  88 #define DIM 3
  89 #include "s_texfetch_tmp.h"
  90
  91
  92 /**
  93  * All compressed texture texel fetching is done though this function.
  94  * Basically just call a core-Mesa texel fetch function.
  95  */
  96 static void
  97 fetch_compressed(const struct swrast_texture_image *swImage,
  98                  GLint i, GLint j, GLint k, GLfloat *texel)
  99 {
 100    /* The FetchCompressedTexel function takes an integer pixel rowstride,
 101     * while the image's rowstride is bytes per row of blocks.
 102     */
 103    GLuint bw, bh;
 104    GLuint texelBytes = _mesa_get_format_bytes(swImage->Base.TexFormat);
 105    _mesa_get_format_block_size(swImage->Base.TexFormat, &bw, &bh);
 106    assert(swImage->RowStride * bw % texelBytes == 0);
 107
 108    swImage->FetchCompressedTexel(swImage->ImageSlices[k],
 109                                  swImage->RowStride * bw / texelBytes,
 110                                  i, j, texel);
 111 }
 112
 113
 114
 115 /**
 116  * Null texel fetch function.
 117  *
 118  * Have to have this so the FetchTexel function pointer is never NULL.
 119  */
 120 static void fetch_null_texelf( const struct swrast_texture_image *texImage,
 121                                GLint i, GLint j, GLint k, GLfloat *texel )
 122 {
 123    (void) texImage; (void) i; (void) j; (void) k;
 124    texel[RCOMP] = 0.0;
 125    texel[GCOMP] = 0.0;
 126    texel[BCOMP] = 0.0;
 127    texel[ACOMP] = 0.0;
 128    _mesa_warning(NULL, "fetch_null_texelf() called!");
 129 }
 130
 131
 132 /**
 133  * Table to map MESA_FORMAT_ to texel fetch/store funcs.
 134  * XXX this is somewhat temporary.
 135  */
 136 static struct {
 137    mesa_format Name;
 138    FetchTexelFunc Fetch1D;
 139    FetchTexelFunc Fetch2D;
 140    FetchTexelFunc Fetch3D;
 141 }
 142 texfetch_funcs[] =
 143 {
 144    {
 145       MESA_FORMAT_NONE,
 146       fetch_null_texelf,
 147       fetch_null_texelf,
 148       fetch_null_texelf
 149    },
 150
 151    /* Packed unorm formats */
 152    {
 153       MESA_FORMAT_A8B8G8R8_UNORM,
 154       fetch_texel_1d_f_rgba8888,
 155       fetch_texel_2d_f_rgba8888,
 156       fetch_texel_3d_f_rgba8888
 157    },
 158    {
 159       MESA_FORMAT_X8B8G8R8_UNORM,
 160       fetch_texel_1d_f_rgbx8888,
 161       fetch_texel_2d_f_rgbx8888,
 162       fetch_texel_3d_f_rgbx8888
 163    },
 164    {
 165       MESA_FORMAT_R8G8B8A8_UNORM,
 166       fetch_texel_1d_f_rgba8888_rev,
 167       fetch_texel_2d_f_rgba8888_rev,
 168       fetch_texel_3d_f_rgba8888_rev
 169    },
 170    {
 171       MESA_FORMAT_R8G8B8X8_UNORM,
 172       fetch_texel_1d_f_rgbx8888_rev,
 173       fetch_texel_2d_f_rgbx8888_rev,
 174       fetch_texel_3d_f_rgbx8888_rev
 175    },
 176    {
 177       MESA_FORMAT_B8G8R8A8_UNORM,
 178       fetch_texel_1d_f_argb8888,
 179       fetch_texel_2d_f_argb8888,
 180       fetch_texel_3d_f_argb8888
 181    },
 182    {
 183       MESA_FORMAT_B8G8R8X8_UNORM,
 184       fetch_texel_1d_f_xrgb8888,
 185       fetch_texel_2d_f_xrgb8888,
 186       fetch_texel_3d_f_xrgb8888
 187    },
 188    {
 189       MESA_FORMAT_A8R8G8B8_UNORM,
 190       fetch_texel_1d_f_argb8888_rev,
 191       fetch_texel_2d_f_argb8888_rev,
 192       fetch_texel_3d_f_argb8888_rev
 193    },
 194    {
 195       MESA_FORMAT_X8R8G8B8_UNORM,
 196       fetch_texel_1d_f_xrgb8888_rev,
 197       fetch_texel_2d_f_xrgb8888_rev,
 198       fetch_texel_3d_f_xrgb8888_rev
 199    },
 200    {
 201       MESA_FORMAT_L16A16_UNORM,
 202       fetch_texel_1d_f_al1616,
 203       fetch_texel_2d_f_al1616,
 204       fetch_texel_3d_f_al1616
 205    },
 206    {
 207       MESA_FORMAT_A16L16_UNORM,
 208       fetch_texel_1d_f_al1616_rev,
 209       fetch_texel_2d_f_al1616_rev,
 210       fetch_texel_3d_f_al1616_rev
 211    },
 212    {
 213       MESA_FORMAT_B5G6R5_UNORM,
 214       fetch_texel_1d_f_rgb565,
 215       fetch_texel_2d_f_rgb565,
 216       fetch_texel_3d_f_rgb565
 217    },
 218    {
 219       MESA_FORMAT_R5G6B5_UNORM,
 220       fetch_texel_1d_f_rgb565_rev,
 221       fetch_texel_2d_f_rgb565_rev,
 222       fetch_texel_3d_f_rgb565_rev
 223    },
 224    {
 225       MESA_FORMAT_B4G4R4A4_UNORM,
 226       fetch_texel_1d_f_argb4444,
 227       fetch_texel_2d_f_argb4444,
 228       fetch_texel_3d_f_argb4444
 229    },
 230    {
 231       MESA_FORMAT_B4G4R4X4_UNORM,
 232       NULL,
 233       NULL,
 234       NULL
 235    },
 236    {
 237       MESA_FORMAT_A4R4G4B4_UNORM,
 238       fetch_texel_1d_f_argb4444_rev,
 239       fetch_texel_2d_f_argb4444_rev,
 240       fetch_texel_3d_f_argb4444_rev
 241    },
 242    {
 243       MESA_FORMAT_A1B5G5R5_UNORM,
 244       fetch_texel_1d_f_rgba5551,
 245       fetch_texel_2d_f_rgba5551,
 246       fetch_texel_3d_f_rgba5551
 247    },
 248    {
 249       MESA_FORMAT_B5G5R5A1_UNORM,
 250       fetch_texel_1d_f_argb1555,
 251       fetch_texel_2d_f_argb1555,
 252       fetch_texel_3d_f_argb1555
 253    },
 254    {
 255       MESA_FORMAT_B5G5R5X1_UNORM,
 256       NULL,
 257       NULL,
 258       NULL
 259    },
 260    {
 261       MESA_FORMAT_A1R5G5B5_UNORM,
 262       fetch_texel_1d_f_argb1555_rev,
 263       fetch_texel_2d_f_argb1555_rev,
 264       fetch_texel_3d_f_argb1555_rev
 265    },
 266    {
 267       MESA_FORMAT_L8A8_UNORM,
 268       fetch_texel_1d_f_al88,
 269       fetch_texel_2d_f_al88,
 270       fetch_texel_3d_f_al88
 271    },
 272    {
 273       MESA_FORMAT_A8L8_UNORM,
 274       fetch_texel_1d_f_al88_rev,
 275       fetch_texel_2d_f_al88_rev,
 276       fetch_texel_3d_f_al88_rev
 277    },
 278    {
 279       MESA_FORMAT_R8G8_UNORM,
 280       fetch_texel_1d_f_gr88,
 281       fetch_texel_2d_f_gr88,
 282       fetch_texel_3d_f_gr88
 283    },
 284    {
 285       MESA_FORMAT_G8R8_UNORM,
 286       fetch_texel_1d_f_rg88,
 287       fetch_texel_2d_f_rg88,
 288       fetch_texel_3d_f_rg88
 289    },
 290    {
 291       MESA_FORMAT_L4A4_UNORM,
 292       fetch_texel_1d_f_al44,
 293       fetch_texel_2d_f_al44,
 294       fetch_texel_3d_f_al44
 295    },
 296    {
 297       MESA_FORMAT_B2G3R3_UNORM,
 298       fetch_texel_1d_f_rgb332,
 299       fetch_texel_2d_f_rgb332,
 300       fetch_texel_3d_f_rgb332
 301    },
 302    {
 303       MESA_FORMAT_R16G16_UNORM,
 304       fetch_texel_1d_f_rg1616,
 305       fetch_texel_2d_f_rg1616,
 306       fetch_texel_3d_f_rg1616
 307    },
 308    {
 309       MESA_FORMAT_G16R16_UNORM,
 310       fetch_texel_1d_f_rg1616_rev,
 311       fetch_texel_2d_f_rg1616_rev,
 312       fetch_texel_3d_f_rg1616_rev
 313    },
 314    {
 315       MESA_FORMAT_B10G10R10A2_UNORM,
 316       fetch_texel_1d_f_argb2101010,
 317       fetch_texel_2d_f_argb2101010,
 318       fetch_texel_3d_f_argb2101010
 319    },
 320    {
 321       MESA_FORMAT_B10G10R10X2_UNORM,
 322       NULL,
 323       NULL,
 324       NULL
 325    },
 326    {
 327       MESA_FORMAT_R10G10B10A2_UNORM,
 328       NULL,
 329       NULL,
 330       NULL
 331    },
 332    {
 333       MESA_FORMAT_S8_UINT_Z24_UNORM,
 334       fetch_texel_1d_f_z24_s8,
 335       fetch_texel_2d_f_z24_s8,
 336       fetch_texel_3d_f_z24_s8
 337    },
 338    {
 339       MESA_FORMAT_X8Z24_UNORM,
 340       fetch_texel_1d_f_z24_s8,
 341       fetch_texel_2d_f_z24_s8,
 342       fetch_texel_3d_f_z24_s8
 343    },
 344    {
 345       MESA_FORMAT_Z24_UNORM_S8_UINT,
 346       fetch_texel_1d_f_s8_z24,
 347       fetch_texel_2d_f_s8_z24,
 348       fetch_texel_3d_f_s8_z24
 349    },
 350    {
 351       MESA_FORMAT_Z24_UNORM_X8_UINT,
 352       fetch_texel_1d_f_s8_z24,
 353       fetch_texel_2d_f_s8_z24,
 354       fetch_texel_3d_f_s8_z24
 355    },
 356    {
 357       MESA_FORMAT_YCBCR,
 358       fetch_texel_1d_f_ycbcr,
 359       fetch_texel_2d_f_ycbcr,
 360       fetch_texel_3d_f_ycbcr
 361    },
 362    {
 363       MESA_FORMAT_YCBCR_REV,
 364       fetch_texel_1d_f_ycbcr_rev,
 365       fetch_texel_2d_f_ycbcr_rev,
 366       fetch_texel_3d_f_ycbcr_rev
 367    },
 368    {
 369       MESA_FORMAT_DUDV8,
 370       fetch_texel_1d_dudv8,
 371       fetch_texel_2d_dudv8,
 372       fetch_texel_3d_dudv8
 373    },
 374
 375    /* Array unorm formats */
 376    {
 377       MESA_FORMAT_A_UNORM8,
 378       fetch_texel_1d_f_a8,
 379       fetch_texel_2d_f_a8,
 380       fetch_texel_3d_f_a8
 381    },
 382    {
 383       MESA_FORMAT_A_UNORM16,
 384       fetch_texel_1d_f_a16,
 385       fetch_texel_2d_f_a16,
 386       fetch_texel_3d_f_a16
 387    },
 388    {
 389       MESA_FORMAT_L_UNORM8,
 390       fetch_texel_1d_f_l8,
 391       fetch_texel_2d_f_l8,
 392       fetch_texel_3d_f_l8
 393    },
 394    {
 395       MESA_FORMAT_L_UNORM16,
 396       fetch_texel_1d_f_l16,
 397       fetch_texel_2d_f_l16,
 398       fetch_texel_3d_f_l16
 399    },
 400    {
 401       MESA_FORMAT_I_UNORM8,
 402       fetch_texel_1d_f_i8,
 403       fetch_texel_2d_f_i8,
 404       fetch_texel_3d_f_i8
 405    },
 406    {
 407       MESA_FORMAT_I_UNORM16,
 408       fetch_texel_1d_f_i16,
 409       fetch_texel_2d_f_i16,
 410       fetch_texel_3d_f_i16
 411    },
 412    {
 413       MESA_FORMAT_R_UNORM8,
 414       fetch_texel_1d_f_r8,
 415       fetch_texel_2d_f_r8,
 416       fetch_texel_3d_f_r8
 417    },
 418    {
 419       MESA_FORMAT_R_UNORM16,
 420       fetch_texel_1d_f_r16,
 421       fetch_texel_2d_f_r16,
 422       fetch_texel_3d_f_r16
 423    },
 424    {
 425       MESA_FORMAT_BGR_UNORM8,
 426       fetch_texel_1d_f_rgb888,
 427       fetch_texel_2d_f_rgb888,
 428       fetch_texel_3d_f_rgb888
 429    },
 430    {
 431       MESA_FORMAT_RGB_UNORM8,
 432       fetch_texel_1d_f_bgr888,
 433       fetch_texel_2d_f_bgr888,
 434       fetch_texel_3d_f_bgr888
 435    },
 436    {
 437       MESA_FORMAT_RGBA_UNORM16,
 438       fetch_texel_1d_rgba_16,
 439       fetch_texel_2d_rgba_16,
 440       fetch_texel_3d_rgba_16
 441    },
 442    {
 443       MESA_FORMAT_RGBX_UNORM16,
 444       fetch_texel_1d_xbgr16161616_unorm,
 445       fetch_texel_2d_xbgr16161616_unorm,
 446       fetch_texel_3d_xbgr16161616_unorm
 447    },
 448    {
 449       MESA_FORMAT_Z_UNORM16,
 450       fetch_texel_1d_f_z16,
 451       fetch_texel_2d_f_z16,
 452       fetch_texel_3d_f_z16
 453    },
 454    {
 455       MESA_FORMAT_Z_UNORM32,
 456       fetch_texel_1d_f_z32,
 457       fetch_texel_2d_f_z32,
 458       fetch_texel_3d_f_z32
 459    },
 460    {
 461       MESA_FORMAT_S_UINT8,
 462       NULL,
 463       NULL,
 464       NULL
 465    },
 466
 467    /* Packed signed/normalized formats */
 468    {
 469       MESA_FORMAT_A8B8G8R8_SNORM,
 470       fetch_texel_1d_signed_rgba8888,
 471       fetch_texel_2d_signed_rgba8888,
 472       fetch_texel_3d_signed_rgba8888
 473    },
 474    {
 475       MESA_FORMAT_X8B8G8R8_SNORM,
 476       fetch_texel_1d_signed_rgbx8888,
 477       fetch_texel_2d_signed_rgbx8888,
 478       fetch_texel_3d_signed_rgbx8888
 479    },
 480    {
 481       MESA_FORMAT_R8G8B8A8_SNORM,
 482       fetch_texel_1d_signed_rgba8888_rev,
 483       fetch_texel_2d_signed_rgba8888_rev,
 484       fetch_texel_3d_signed_rgba8888_rev
 485    },
 486    {
 487       MESA_FORMAT_R8G8B8X8_SNORM,
 488       NULL,
 489       NULL,
 490       NULL
 491    },
 492    {
 493       MESA_FORMAT_R16G16_SNORM,
 494       fetch_texel_1d_signed_rg1616,
 495       fetch_texel_2d_signed_rg1616,
 496       fetch_texel_3d_signed_rg1616
 497    },
 498    {
 499       MESA_FORMAT_G16R16_SNORM,
 500       NULL,
 501       NULL,
 502       NULL
 503    },
 504    {
 505       MESA_FORMAT_R8G8_SNORM,
 506       fetch_texel_1d_signed_rg88_rev,
 507       fetch_texel_2d_signed_rg88_rev,
 508       fetch_texel_3d_signed_rg88_rev
 509    },
 510    {
 511       MESA_FORMAT_G8R8_SNORM,
 512       NULL,
 513       NULL,
 514       NULL
 515    },
 516    {
 517       MESA_FORMAT_L8A8_SNORM,
 518       fetch_texel_1d_signed_al88,
 519       fetch_texel_2d_signed_al88,
 520       fetch_texel_3d_signed_al88
 521    },
 522
 523    /* Array signed/normalized formats */
 524    {
 525       MESA_FORMAT_A_SNORM8,
 526       fetch_texel_1d_signed_a8,
 527       fetch_texel_2d_signed_a8,
 528       fetch_texel_3d_signed_a8
 529    },
 530    {
 531       MESA_FORMAT_A_SNORM16,
 532       fetch_texel_1d_signed_a16,
 533       fetch_texel_2d_signed_a16,
 534       fetch_texel_3d_signed_a16
 535    },
 536    {
 537       MESA_FORMAT_L_SNORM8,
 538       fetch_texel_1d_signed_l8,
 539       fetch_texel_2d_signed_l8,
 540       fetch_texel_3d_signed_l8
 541    },
 542    {
 543       MESA_FORMAT_L_SNORM16,
 544       fetch_texel_1d_signed_l16,
 545       fetch_texel_2d_signed_l16,
 546       fetch_texel_3d_signed_l16
 547    },
 548    {
 549       MESA_FORMAT_I_SNORM8,
 550       fetch_texel_1d_signed_i8,
 551       fetch_texel_2d_signed_i8,
 552       fetch_texel_3d_signed_i8
 553    },
 554    {
 555       MESA_FORMAT_I_SNORM16,
 556       fetch_texel_1d_signed_i16,
 557       fetch_texel_2d_signed_i16,
 558       fetch_texel_3d_signed_i16
 559    },
 560    {
 561       MESA_FORMAT_R_SNORM8,
 562       fetch_texel_1d_signed_r8,
 563       fetch_texel_2d_signed_r8,
 564       fetch_texel_3d_signed_r8
 565    },
 566    {
 567       MESA_FORMAT_R_SNORM16,
 568       fetch_texel_1d_signed_r16,
 569       fetch_texel_2d_signed_r16,
 570       fetch_texel_3d_signed_r16
 571    },
 572    {
 573       MESA_FORMAT_LA_SNORM16,
 574       fetch_texel_1d_signed_al1616,
 575       fetch_texel_2d_signed_al1616,
 576       fetch_texel_3d_signed_al1616
 577    },
 578    {
 579       MESA_FORMAT_RGB_SNORM16,
 580       fetch_texel_1d_signed_rgb_16,
 581       fetch_texel_2d_signed_rgb_16,
 582       fetch_texel_3d_signed_rgb_16
 583    },
 584    {
 585       MESA_FORMAT_RGBA_SNORM16,
 586       fetch_texel_1d_signed_rgba_16,
 587       fetch_texel_2d_signed_rgba_16,
 588       fetch_texel_3d_signed_rgba_16
 589    },
 590    {
 591       MESA_FORMAT_RGBX_SNORM16,
 592       NULL,
 593       NULL,
 594       NULL
 595    },
 596
 597    /* Packed sRGB formats */
 598    {
 599       MESA_FORMAT_A8B8G8R8_SRGB,
 600       fetch_texel_1d_srgba8,
 601       fetch_texel_2d_srgba8,
 602       fetch_texel_3d_srgba8
 603    },
 604    {
 605       MESA_FORMAT_B8G8R8A8_SRGB,
 606       fetch_texel_1d_sargb8,
 607       fetch_texel_2d_sargb8,
 608       fetch_texel_3d_sargb8
 609    },
 610    {
 611       MESA_FORMAT_B8G8R8X8_SRGB,
 612       NULL,
 613       NULL,
 614       NULL
 615    },
 616    {
 617       MESA_FORMAT_R8G8B8A8_SRGB,
 618       fetch_texel_1d_sabgr8,
 619       fetch_texel_2d_sabgr8,
 620       fetch_texel_3d_sabgr8
 621    },
 622    {
 623       MESA_FORMAT_R8G8B8X8_SRGB,
 624       fetch_texel_1d_sxbgr8,
 625       fetch_texel_2d_sxbgr8,
 626       fetch_texel_3d_sxbgr8
 627    },
 628    {
 629       MESA_FORMAT_L8A8_SRGB,
 630       fetch_texel_1d_sla8,
 631       fetch_texel_2d_sla8,
 632       fetch_texel_3d_sla8
 633    },
 634
 635    /* Array sRGB formats */
 636    {
 637       MESA_FORMAT_L_SRGB8,
 638       fetch_texel_1d_sl8,
 639       fetch_texel_2d_sl8,
 640       fetch_texel_3d_sl8
 641    },
 642    {
 643       MESA_FORMAT_BGR_SRGB8,
 644       fetch_texel_1d_srgb8,
 645       fetch_texel_2d_srgb8,
 646       fetch_texel_3d_srgb8
 647    },
 648
 649    /* Packed float formats */
 650    {
 651       MESA_FORMAT_R9G9B9E5_FLOAT,
 652       fetch_texel_1d_rgb9_e5,
 653       fetch_texel_2d_rgb9_e5,
 654       fetch_texel_3d_rgb9_e5
 655    },
 656    {
 657       MESA_FORMAT_R11G11B10_FLOAT,
 658       fetch_texel_1d_r11_g11_b10f,
 659       fetch_texel_2d_r11_g11_b10f,
 660       fetch_texel_3d_r11_g11_b10f
 661    },
 662    {
 663       MESA_FORMAT_Z32_FLOAT_S8X24_UINT,
 664       fetch_texel_1d_z32f_x24s8,
 665       fetch_texel_2d_z32f_x24s8,
 666       fetch_texel_3d_z32f_x24s8
 667    },
 668
 669    /* Array float formats */
 670    {
 671       MESA_FORMAT_A_FLOAT16,
 672       fetch_texel_1d_f_alpha_f16,
 673       fetch_texel_2d_f_alpha_f16,
 674       fetch_texel_3d_f_alpha_f16
 675    },
 676    {
 677       MESA_FORMAT_A_FLOAT32,
 678       fetch_texel_1d_f_alpha_f32,
 679       fetch_texel_2d_f_alpha_f32,
 680       fetch_texel_3d_f_alpha_f32
 681    },
 682    {
 683       MESA_FORMAT_L_FLOAT16,
 684       fetch_texel_1d_f_luminance_f16,
 685       fetch_texel_2d_f_luminance_f16,
 686       fetch_texel_3d_f_luminance_f16
 687    },
 688    {
 689       MESA_FORMAT_L_FLOAT32,
 690       fetch_texel_1d_f_luminance_f32,
 691       fetch_texel_2d_f_luminance_f32,
 692       fetch_texel_3d_f_luminance_f32
 693    },
 694    {
 695       MESA_FORMAT_LA_FLOAT16,
 696       fetch_texel_1d_f_luminance_alpha_f16,
 697       fetch_texel_2d_f_luminance_alpha_f16,
 698       fetch_texel_3d_f_luminance_alpha_f16
 699    },
 700    {
 701       MESA_FORMAT_LA_FLOAT32,
 702       fetch_texel_1d_f_luminance_alpha_f32,
 703       fetch_texel_2d_f_luminance_alpha_f32,
 704       fetch_texel_3d_f_luminance_alpha_f32
 705    },
 706    {
 707       MESA_FORMAT_I_FLOAT16,
 708       fetch_texel_1d_f_intensity_f16,
 709       fetch_texel_2d_f_intensity_f16,
 710       fetch_texel_3d_f_intensity_f16
 711    },
 712    {
 713       MESA_FORMAT_I_FLOAT32,
 714       fetch_texel_1d_f_intensity_f32,
 715       fetch_texel_2d_f_intensity_f32,
 716       fetch_texel_3d_f_intensity_f32
 717    },
 718    {
 719       MESA_FORMAT_R_FLOAT16,
 720       fetch_texel_1d_f_r_f16,
 721       fetch_texel_2d_f_r_f16,
 722       fetch_texel_3d_f_r_f16
 723    },
 724    {
 725       MESA_FORMAT_R_FLOAT32,
 726       fetch_texel_1d_f_r_f32,
 727       fetch_texel_2d_f_r_f32,
 728       fetch_texel_3d_f_r_f32
 729    },
 730    {
 731       MESA_FORMAT_RG_FLOAT16,
 732       fetch_texel_1d_f_rg_f16,
 733       fetch_texel_2d_f_rg_f16,
 734       fetch_texel_3d_f_rg_f16
 735    },
 736    {
 737       MESA_FORMAT_RG_FLOAT32,
 738       fetch_texel_1d_f_rg_f32,
 739       fetch_texel_2d_f_rg_f32,
 740       fetch_texel_3d_f_rg_f32
 741    },
 742    {
 743       MESA_FORMAT_RGB_FLOAT16,
 744       fetch_texel_1d_f_rgb_f16,
 745       fetch_texel_2d_f_rgb_f16,
 746       fetch_texel_3d_f_rgb_f16
 747    },
 748    {
 749       MESA_FORMAT_RGB_FLOAT32,
 750       fetch_texel_1d_f_rgb_f32,
 751       fetch_texel_2d_f_rgb_f32,
 752       fetch_texel_3d_f_rgb_f32
 753    },
 754    {
 755       MESA_FORMAT_RGBA_FLOAT16,
 756       fetch_texel_1d_f_rgba_f16,
 757       fetch_texel_2d_f_rgba_f16,
 758       fetch_texel_3d_f_rgba_f16
 759    },
 760    {
 761       MESA_FORMAT_RGBA_FLOAT32,
 762       fetch_texel_1d_f_rgba_f32,
 763       fetch_texel_2d_f_rgba_f32,
 764       fetch_texel_3d_f_rgba_f32
 765    },
 766    {
 767       MESA_FORMAT_RGBX_FLOAT16,
 768       fetch_texel_1d_xbgr16161616_float,
 769       fetch_texel_2d_xbgr16161616_float,
 770       fetch_texel_3d_xbgr16161616_float
 771    },
 772    {
 773       MESA_FORMAT_RGBX_FLOAT32,
 774       fetch_texel_1d_xbgr32323232_float,
 775       fetch_texel_2d_xbgr32323232_float,
 776       fetch_texel_3d_xbgr32323232_float
 777    },
 778    {
 779       MESA_FORMAT_Z_FLOAT32,
 780       fetch_texel_1d_f_r_f32, /* Reuse the R32F functions. */
 781       fetch_texel_2d_f_r_f32,
 782       fetch_texel_3d_f_r_f32
 783    },
 784
 785    /* Packed signed/unsigned non-normalized integer formats */
 786    {
 787       MESA_FORMAT_B10G10R10A2_UINT,
 788       NULL,
 789       NULL,
 790       NULL
 791    },
 792    {
 793       MESA_FORMAT_R10G10B10A2_UINT,
 794       NULL,
 795       NULL,
 796       NULL
 797    },
 798
 799    /* Array signed/unsigned non-normalized integer formats */
 800    {
 801       MESA_FORMAT_A_UINT8,
 802       NULL,
 803       NULL,
 804       NULL
 805    },
 806    {
 807       MESA_FORMAT_A_UINT16,
 808       NULL,
 809       NULL,
 810       NULL
 811    },
 812    {
 813       MESA_FORMAT_A_UINT32,
 814       NULL,
 815       NULL,
 816       NULL
 817    },
 818    {
 819       MESA_FORMAT_A_SINT8,
 820       NULL,
 821       NULL,
 822       NULL
 823    },
 824    {
 825       MESA_FORMAT_A_SINT16,
 826       NULL,
 827       NULL,
 828       NULL
 829    },
 830    {
 831       MESA_FORMAT_A_SINT32,
 832       NULL,
 833       NULL,
 834       NULL
 835    },
 836    {
 837       MESA_FORMAT_I_UINT8,
 838       NULL,
 839       NULL,
 840       NULL
 841    },
 842    {
 843       MESA_FORMAT_I_UINT16,
 844       NULL,
 845       NULL,
 846       NULL
 847    },
 848    {
 849       MESA_FORMAT_I_UINT32,
 850       NULL,
 851       NULL,
 852       NULL
 853    },
 854    {
 855       MESA_FORMAT_I_SINT8,
 856       NULL,
 857       NULL,
 858       NULL
 859    },
 860    {
 861       MESA_FORMAT_I_SINT16,
 862       NULL,
 863       NULL,
 864       NULL
 865    },
 866    {
 867       MESA_FORMAT_I_SINT32,
 868       NULL,
 869       NULL,
 870       NULL
 871    },
 872    {
 873       MESA_FORMAT_L_UINT8,
 874       NULL,
 875       NULL,
 876       NULL
 877    },
 878    {
 879       MESA_FORMAT_L_UINT16,
 880       NULL,
 881       NULL,
 882       NULL
 883    },
 884    {
 885       MESA_FORMAT_L_UINT32,
 886       NULL,
 887       NULL,
 888       NULL
 889    },
 890    {
 891       MESA_FORMAT_L_SINT8,
 892       NULL,
 893       NULL,
 894       NULL
 895    },
 896    {
 897       MESA_FORMAT_L_SINT16,
 898       NULL,
 899       NULL,
 900       NULL
 901    },
 902    {
 903       MESA_FORMAT_L_SINT32,
 904       NULL,
 905       NULL,
 906       NULL
 907    },
 908    {
 909       MESA_FORMAT_LA_UINT8,
 910       NULL,
 911       NULL,
 912       NULL
 913    },
 914    {
 915       MESA_FORMAT_LA_UINT16,
 916       NULL,
 917       NULL,
 918       NULL
 919    },
 920    {
 921       MESA_FORMAT_LA_UINT32,
 922       NULL,
 923       NULL,
 924       NULL
 925    },
 926    {
 927       MESA_FORMAT_LA_SINT8,
 928       NULL,
 929       NULL,
 930       NULL
 931    },
 932    {
 933       MESA_FORMAT_LA_SINT16,
 934       NULL,
 935       NULL,
 936       NULL
 937    },
 938    {
 939       MESA_FORMAT_LA_SINT32,
 940       NULL,
 941       NULL,
 942       NULL
 943    },
 944    {
 945       MESA_FORMAT_R_UINT8,
 946       NULL,
 947       NULL,
 948       NULL
 949    },
 950    {
 951       MESA_FORMAT_R_UINT16,
 952       NULL,
 953       NULL,
 954       NULL
 955    },
 956    {
 957       MESA_FORMAT_R_UINT32,
 958       NULL,
 959       NULL,
 960       NULL
 961    },
 962    {
 963       MESA_FORMAT_R_SINT8,
 964       NULL,
 965       NULL,
 966       NULL
 967    },
 968    {
 969       MESA_FORMAT_R_SINT16,
 970       NULL,
 971       NULL,
 972       NULL
 973    },
 974    {
 975       MESA_FORMAT_R_SINT32,
 976       NULL,
 977       NULL,
 978       NULL
 979    },
 980    {
 981       MESA_FORMAT_RG_UINT8,
 982       NULL,
 983       NULL,
 984       NULL
 985    },
 986    {
 987       MESA_FORMAT_RG_UINT16,
 988       NULL,
 989       NULL,
 990       NULL
 991    },
 992    {
 993       MESA_FORMAT_RG_UINT32,
 994       NULL,
 995       NULL,
 996       NULL
 997    },
 998    {
 999       MESA_FORMAT_RG_SINT8,
1000       NULL,
1001       NULL,
1002       NULL
1003    },
1004    {
1005       MESA_FORMAT_RG_SINT16,
1006       NULL,
1007       NULL,
1008       NULL
1009    },
1010    {
1011       MESA_FORMAT_RG_SINT32,
1012       NULL,
1013       NULL,
1014       NULL
1015    },
1016    {
1017       MESA_FORMAT_RGB_UINT8,
1018       NULL,
1019       NULL,
1020       NULL
1021    },
1022    {
1023       MESA_FORMAT_RGB_UINT16,
1024       NULL,
1025       NULL,
1026       NULL
1027    },
1028    {
1029       MESA_FORMAT_RGB_UINT32,
1030       NULL,
1031       NULL,
1032       NULL
1033    },
1034    {
1035       MESA_FORMAT_RGB_SINT8,
1036       NULL,
1037       NULL,
1038       NULL
1039    },
1040    {
1041       MESA_FORMAT_RGB_SINT16,
1042       NULL,
1043       NULL,
1044       NULL
1045    },
1046    {
1047       MESA_FORMAT_RGB_SINT32,
1048       NULL,
1049       NULL,
1050       NULL
1051    },
1052    {
1053       MESA_FORMAT_RGBA_UINT8,
1054       fetch_texel_1d_rgba_uint8,
1055       fetch_texel_2d_rgba_uint8,
1056       fetch_texel_3d_rgba_uint8
1057    },
1058    {
1059       MESA_FORMAT_RGBA_UINT16,
1060       fetch_texel_1d_rgba_uint16,
1061       fetch_texel_2d_rgba_uint16,
1062       fetch_texel_3d_rgba_uint16
1063    },
1064    {
1065       MESA_FORMAT_RGBA_UINT32,
1066       fetch_texel_1d_rgba_uint32,
1067       fetch_texel_2d_rgba_uint32,
1068       fetch_texel_3d_rgba_uint32
1069    },
1070    {
1071       MESA_FORMAT_RGBA_SINT8,
1072       fetch_texel_1d_rgba_int8,
1073       fetch_texel_2d_rgba_int8,
1074       fetch_texel_3d_rgba_int8
1075    },
1076    {
1077       MESA_FORMAT_RGBA_SINT16,
1078       fetch_texel_1d_rgba_int16,
1079       fetch_texel_2d_rgba_int16,
1080       fetch_texel_3d_rgba_int16
1081    },
1082    {
1083       MESA_FORMAT_RGBA_SINT32,
1084       fetch_texel_1d_rgba_int32,
1085       fetch_texel_2d_rgba_int32,
1086       fetch_texel_3d_rgba_int32
1087    },
1088    {
1089       MESA_FORMAT_RGBX_UINT8,
1090       NULL,
1091       NULL,
1092       NULL
1093    },
1094    {
1095       MESA_FORMAT_RGBX_UINT16,
1096       NULL,
1097       NULL,
1098       NULL
1099    },
1100    {
1101       MESA_FORMAT_RGBX_UINT32,
1102       NULL,
1103       NULL,
1104       NULL
1105    },
1106    {
1107       MESA_FORMAT_RGBX_SINT8,
1108       NULL,
1109       NULL,
1110       NULL
1111    },
1112    {
1113       MESA_FORMAT_RGBX_SINT16,
1114       NULL,
1115       NULL,
1116       NULL
1117    },
1118    {
1119       MESA_FORMAT_RGBX_SINT32,
1120       NULL,
1121       NULL,
1122       NULL
1123    },
1124
1125    /* DXT compressed formats */
1126    {
1127       MESA_FORMAT_RGB_DXT1,
1128       fetch_compressed,
1129       fetch_compressed,
1130       fetch_compressed
1131    },
1132    {
1133       MESA_FORMAT_RGBA_DXT1,
1134       fetch_compressed,
1135       fetch_compressed,
1136       fetch_compressed
1137    },
1138    {
1139       MESA_FORMAT_RGBA_DXT3,
1140       fetch_compressed,
1141       fetch_compressed,
1142       fetch_compressed
1143    },
1144    {
1145       MESA_FORMAT_RGBA_DXT5,
1146       fetch_compressed,
1147       fetch_compressed,
1148       fetch_compressed
1149    },
1150
1151    /* DXT sRGB compressed formats */
1152    {
1153       MESA_FORMAT_SRGB_DXT1,
1154       fetch_compressed,
1155       fetch_compressed,
1156       fetch_compressed
1157    },
1158    {
1159       MESA_FORMAT_SRGBA_DXT1,
1160       fetch_compressed,
1161       fetch_compressed,
1162       fetch_compressed
1163    },
1164    {
1165       MESA_FORMAT_SRGBA_DXT3,
1166       fetch_compressed,
1167       fetch_compressed,
1168       fetch_compressed
1169    },
1170    {
1171       MESA_FORMAT_SRGBA_DXT5,
1172       fetch_compressed,
1173       fetch_compressed,
1174       fetch_compressed
1175    },
1176
1177    /* FXT1 compressed formats */
1178    {
1179       MESA_FORMAT_RGB_FXT1,
1180       fetch_compressed,
1181       fetch_compressed,
1182       fetch_compressed
1183    },
1184    {
1185       MESA_FORMAT_RGBA_FXT1,
1186       fetch_compressed,
1187       fetch_compressed,
1188       fetch_compressed
1189    },
1190
1191    /* RGTC compressed formats */
1192    {
1193       MESA_FORMAT_R_RGTC1_UNORM,
1194       fetch_compressed,
1195       fetch_compressed,
1196       fetch_compressed
1197    },
1198    {
1199       MESA_FORMAT_R_RGTC1_SNORM,
1200       fetch_compressed,
1201       fetch_compressed,
1202       fetch_compressed
1203    },
1204    {
1205       MESA_FORMAT_RG_RGTC2_UNORM,
1206       fetch_compressed,
1207       fetch_compressed,
1208       fetch_compressed
1209    },
1210    {
1211       MESA_FORMAT_RG_RGTC2_SNORM,
1212       fetch_compressed,
1213       fetch_compressed,
1214       fetch_compressed
1215    },
1216
1217    /* LATC1/2 compressed formats */
1218    {
1219       MESA_FORMAT_L_LATC1_UNORM,
1220       fetch_compressed,
1221       fetch_compressed,
1222       fetch_compressed
1223    },
1224    {
1225       MESA_FORMAT_L_LATC1_SNORM,
1226       fetch_compressed,
1227       fetch_compressed,
1228       fetch_compressed
1229    },
1230    {
1231       MESA_FORMAT_LA_LATC2_UNORM,
1232       fetch_compressed,
1233       fetch_compressed,
1234       fetch_compressed
1235    },
1236    {
1237       MESA_FORMAT_LA_LATC2_SNORM,
1238       fetch_compressed,
1239       fetch_compressed,
1240       fetch_compressed
1241    },
1242
1243    /* ETC1/2 compressed formats */
1244    {
1245       MESA_FORMAT_ETC1_RGB8,
1246       fetch_compressed,
1247       fetch_compressed,
1248       fetch_compressed
1249    },
1250    {
1251       MESA_FORMAT_ETC2_RGB8,
1252       fetch_compressed,
1253       fetch_compressed,
1254       fetch_compressed
1255    },
1256    {
1257       MESA_FORMAT_ETC2_SRGB8,
1258       fetch_compressed,
1259       fetch_compressed,
1260       fetch_compressed
1261    },
1262    {
1263       MESA_FORMAT_ETC2_RGBA8_EAC,
1264       fetch_compressed,
1265       fetch_compressed,
1266       fetch_compressed
1267    },
1268    {
1269       MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC,
1270       fetch_compressed,
1271       fetch_compressed,
1272       fetch_compressed
1273    },
1274    {
1275       MESA_FORMAT_ETC2_R11_EAC,
1276       fetch_compressed,
1277       fetch_compressed,
1278       fetch_compressed
1279    },
1280    {
1281       MESA_FORMAT_ETC2_RG11_EAC,
1282       fetch_compressed,
1283       fetch_compressed,
1284       fetch_compressed
1285    },
1286    {
1287       MESA_FORMAT_ETC2_SIGNED_R11_EAC,
1288       fetch_compressed,
1289       fetch_compressed,
1290       fetch_compressed
1291    },
1292    {
1293       MESA_FORMAT_ETC2_SIGNED_RG11_EAC,
1294       fetch_compressed,
1295       fetch_compressed,
1296       fetch_compressed
1297    },
1298    {
1299       MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1,
1300       fetch_compressed,
1301       fetch_compressed,
1302       fetch_compressed
1303    },
1304    {
1305       MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1,
1306       fetch_compressed,
1307       fetch_compressed,
1308       fetch_compressed
1309    }
1310 };
1311
1312
1313 /**
1314  * Initialize the texture image's FetchTexel methods.
1315  */
1316 static void
1317 set_fetch_functions(const struct gl_sampler_object *samp,
1318                     struct swrast_texture_image *texImage, GLuint dims)
1319 {
1320    mesa_format format = texImage->Base.TexFormat;
1321
1322 #ifdef DEBUG
1323    /* check that the table entries are sorted by format name */
1324    mesa_format fmt;
1325    for (fmt = 0; fmt < MESA_FORMAT_COUNT; fmt++) {
1326       assert(texfetch_funcs[fmt].Name == fmt);
1327    }
1328 #endif
1329
1330    STATIC_ASSERT(Elements(texfetch_funcs) == MESA_FORMAT_COUNT);
1331
1332    if (samp->sRGBDecode == GL_SKIP_DECODE_EXT &&
1333        _mesa_get_format_color_encoding(format) == GL_SRGB) {
1334       format = _mesa_get_srgb_format_linear(format);
1335    }
1336
1337    assert(format < MESA_FORMAT_COUNT);
1338
1339    switch (dims) {
1340    case 1:
1341       texImage->FetchTexel = texfetch_funcs[format].Fetch1D;
1342       break;
1343    case 2:
1344       texImage->FetchTexel = texfetch_funcs[format].Fetch2D;
1345       break;
1346    case 3:
1347       texImage->FetchTexel = texfetch_funcs[format].Fetch3D;
1348       break;
1349    default:
1350       assert(!"Bad dims in set_fetch_functions()");
1351    }
1352
1353    texImage->FetchCompressedTexel = _mesa_get_compressed_fetch_func(format);
1354
1355    ASSERT(texImage->FetchTexel);
1356 }
1357
1358 void
1359 _mesa_update_fetch_functions(struct gl_context *ctx, GLuint unit)
1360 {
1361    struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
1362    struct gl_sampler_object *samp;
1363    GLuint face, i;
1364    GLuint dims;
1365
1366    if (!texObj)
1367       return;
1368
1369    samp = _mesa_get_samplerobj(ctx, unit);
1370
1371    dims = _mesa_get_texture_dimensions(texObj->Target);
1372
1373    for (face = 0; face < 6; face++) {
1374       for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
1375          if (texObj->Image[face][i]) {
1376             set_fetch_functions(samp,
1377                                 swrast_texture_image(texObj->Image[face][i]),
1378                                 dims);
1379          }
1380       }
1381    }
1382 }