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  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  22  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  23  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24  * OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 /**
  29  * \file s_texfetch.c
  30  *
  31  * Texel fetch/store functions
  32  *
  33  * \author Gareth Hughes
  34  */
  35
  36
  37 #include "main/colormac.h"
  38 #include "main/macros.h"
  39 #include "main/texcompress.h"
  40 #include "main/texcompress_fxt1.h"
  41 #include "main/texcompress_s3tc.h"
  42 #include "main/texcompress_rgtc.h"
  43 #include "main/texcompress_etc.h"
  44 #include "main/teximage.h"
  45 #include "main/samplerobj.h"
  46 #include "s_context.h"
  47 #include "s_texfetch.h"
  48 #include "../../gallium/auxiliary/util/u_format_rgb9e5.h"
  49 #include "../../gallium/auxiliary/util/u_format_r11g11b10f.h"
  50
  51
  52 /**
  53  * Convert an 8-bit sRGB value from non-linear space to a
  54  * linear RGB value in [0, 1].
  55  * Implemented with a 256-entry lookup table.
  56  */
  57 static inline GLfloat
  58 nonlinear_to_linear(GLubyte cs8)
  59 {
  60    static GLfloat table[256];
  61    static GLboolean tableReady = GL_FALSE;
  62    if (!tableReady) {
  63       /* compute lookup table now */
  64       GLuint i;
  65       for (i = 0; i < 256; i++) {
  66          const GLfloat cs = UBYTE_TO_FLOAT(i);
  67          if (cs <= 0.04045) {
  68             table[i] = cs / 12.92f;
  69          }
  70          else {
  71             table[i] = (GLfloat) pow((cs + 0.055) / 1.055, 2.4);
  72          }
  73       }
  74       tableReady = GL_TRUE;
  75    }
  76    return table[cs8];
  77 }
  78
  79
  80
  81 /* Texel fetch routines for all supported formats
  82  */
  83 #define DIM 1
  84 #include "s_texfetch_tmp.h"
  85
  86 #define DIM 2
  87 #include "s_texfetch_tmp.h"
  88
  89 #define DIM 3
  90 #include "s_texfetch_tmp.h"
  91
  92
  93 /**
  94  * All compressed texture texel fetching is done though this function.
  95  * Basically just call a core-Mesa texel fetch function.
  96  */
  97 static void
  98 fetch_compressed(const struct swrast_texture_image *swImage,
  99                  GLint i, GLint j, GLint k, GLfloat *texel)
 100 {
 101    swImage->FetchCompressedTexel(swImage->Map,
 102                                  swImage->ImageOffsets,
 103                                  swImage->RowStride,
 104                                  i, j, k, texel);
 105 }
 106
 107
 108
 109 /**
 110  * Null texel fetch function.
 111  *
 112  * Have to have this so the FetchTexel function pointer is never NULL.
 113  */
 114 static void fetch_null_texelf( const struct swrast_texture_image *texImage,
 115                                GLint i, GLint j, GLint k, GLfloat *texel )
 116 {
 117    (void) texImage; (void) i; (void) j; (void) k;
 118    texel[RCOMP] = 0.0;
 119    texel[GCOMP] = 0.0;
 120    texel[BCOMP] = 0.0;
 121    texel[ACOMP] = 0.0;
 122    _mesa_warning(NULL, "fetch_null_texelf() called!");
 123 }
 124
 125
 126 /**
 127  * Table to map MESA_FORMAT_ to texel fetch/store funcs.
 128  * XXX this is somewhat temporary.
 129  */
 130 static struct {
 131    gl_format Name;
 132    FetchTexelFunc Fetch1D;
 133    FetchTexelFunc Fetch2D;
 134    FetchTexelFunc Fetch3D;
 135 }
 136 texfetch_funcs[] =
 137 {
 138    {
 139       MESA_FORMAT_NONE,
 140       fetch_null_texelf,
 141       fetch_null_texelf,
 142       fetch_null_texelf
 143    },
 144
 145    {
 146       MESA_FORMAT_RGBA8888,
 147       fetch_texel_1d_f_rgba8888,
 148       fetch_texel_2d_f_rgba8888,
 149       fetch_texel_3d_f_rgba8888
 150    },
 151    {
 152       MESA_FORMAT_RGBA8888_REV,
 153       fetch_texel_1d_f_rgba8888_rev,
 154       fetch_texel_2d_f_rgba8888_rev,
 155       fetch_texel_3d_f_rgba8888_rev
 156    },
 157    {
 158       MESA_FORMAT_ARGB8888,
 159       fetch_texel_1d_f_argb8888,
 160       fetch_texel_2d_f_argb8888,
 161       fetch_texel_3d_f_argb8888
 162    },
 163    {
 164       MESA_FORMAT_ARGB8888_REV,
 165       fetch_texel_1d_f_argb8888_rev,
 166       fetch_texel_2d_f_argb8888_rev,
 167       fetch_texel_3d_f_argb8888_rev
 168    },
 169    {
 170       MESA_FORMAT_RGBX8888,
 171       fetch_texel_1d_f_rgbx8888,
 172       fetch_texel_2d_f_rgbx8888,
 173       fetch_texel_3d_f_rgbx8888
 174    },
 175    {
 176       MESA_FORMAT_RGBX8888_REV,
 177       fetch_texel_1d_f_rgbx8888_rev,
 178       fetch_texel_2d_f_rgbx8888_rev,
 179       fetch_texel_3d_f_rgbx8888_rev
 180    },
 181    {
 182       MESA_FORMAT_XRGB8888,
 183       fetch_texel_1d_f_xrgb8888,
 184       fetch_texel_2d_f_xrgb8888,
 185       fetch_texel_3d_f_xrgb8888
 186    },
 187    {
 188       MESA_FORMAT_XRGB8888_REV,
 189       fetch_texel_1d_f_xrgb8888_rev,
 190       fetch_texel_2d_f_xrgb8888_rev,
 191       fetch_texel_3d_f_xrgb8888_rev
 192    },
 193    {
 194       MESA_FORMAT_RGB888,
 195       fetch_texel_1d_f_rgb888,
 196       fetch_texel_2d_f_rgb888,
 197       fetch_texel_3d_f_rgb888
 198    },
 199    {
 200       MESA_FORMAT_BGR888,
 201       fetch_texel_1d_f_bgr888,
 202       fetch_texel_2d_f_bgr888,
 203       fetch_texel_3d_f_bgr888
 204    },
 205    {
 206       MESA_FORMAT_RGB565,
 207       fetch_texel_1d_f_rgb565,
 208       fetch_texel_2d_f_rgb565,
 209       fetch_texel_3d_f_rgb565
 210    },
 211    {
 212       MESA_FORMAT_RGB565_REV,
 213       fetch_texel_1d_f_rgb565_rev,
 214       fetch_texel_2d_f_rgb565_rev,
 215       fetch_texel_3d_f_rgb565_rev
 216    },
 217    {
 218       MESA_FORMAT_ARGB4444,
 219       fetch_texel_1d_f_argb4444,
 220       fetch_texel_2d_f_argb4444,
 221       fetch_texel_3d_f_argb4444
 222    },
 223    {
 224       MESA_FORMAT_ARGB4444_REV,
 225       fetch_texel_1d_f_argb4444_rev,
 226       fetch_texel_2d_f_argb4444_rev,
 227       fetch_texel_3d_f_argb4444_rev
 228    },
 229    {
 230       MESA_FORMAT_RGBA5551,
 231       fetch_texel_1d_f_rgba5551,
 232       fetch_texel_2d_f_rgba5551,
 233       fetch_texel_3d_f_rgba5551
 234    },
 235    {
 236       MESA_FORMAT_ARGB1555,
 237       fetch_texel_1d_f_argb1555,
 238       fetch_texel_2d_f_argb1555,
 239       fetch_texel_3d_f_argb1555
 240    },
 241    {
 242       MESA_FORMAT_ARGB1555_REV,
 243       fetch_texel_1d_f_argb1555_rev,
 244       fetch_texel_2d_f_argb1555_rev,
 245       fetch_texel_3d_f_argb1555_rev
 246    },
 247    {
 248       MESA_FORMAT_AL44,
 249       fetch_texel_1d_f_al44,
 250       fetch_texel_2d_f_al44,
 251       fetch_texel_3d_f_al44
 252    },
 253    {
 254       MESA_FORMAT_AL88,
 255       fetch_texel_1d_f_al88,
 256       fetch_texel_2d_f_al88,
 257       fetch_texel_3d_f_al88
 258    },
 259    {
 260       MESA_FORMAT_AL88_REV,
 261       fetch_texel_1d_f_al88_rev,
 262       fetch_texel_2d_f_al88_rev,
 263       fetch_texel_3d_f_al88_rev
 264    },
 265    {
 266       MESA_FORMAT_AL1616,
 267       fetch_texel_1d_f_al1616,
 268       fetch_texel_2d_f_al1616,
 269       fetch_texel_3d_f_al1616
 270    },
 271    {
 272       MESA_FORMAT_AL1616_REV,
 273       fetch_texel_1d_f_al1616_rev,
 274       fetch_texel_2d_f_al1616_rev,
 275       fetch_texel_3d_f_al1616_rev
 276    },
 277    {
 278       MESA_FORMAT_RGB332,
 279       fetch_texel_1d_f_rgb332,
 280       fetch_texel_2d_f_rgb332,
 281       fetch_texel_3d_f_rgb332
 282    },
 283    {
 284       MESA_FORMAT_A8,
 285       fetch_texel_1d_f_a8,
 286       fetch_texel_2d_f_a8,
 287       fetch_texel_3d_f_a8
 288    },
 289    {
 290       MESA_FORMAT_A16,
 291       fetch_texel_1d_f_a16,
 292       fetch_texel_2d_f_a16,
 293       fetch_texel_3d_f_a16
 294    },
 295    {
 296       MESA_FORMAT_L8,
 297       fetch_texel_1d_f_l8,
 298       fetch_texel_2d_f_l8,
 299       fetch_texel_3d_f_l8
 300    },
 301    {
 302       MESA_FORMAT_L16,
 303       fetch_texel_1d_f_l16,
 304       fetch_texel_2d_f_l16,
 305       fetch_texel_3d_f_l16
 306    },
 307    {
 308       MESA_FORMAT_I8,
 309       fetch_texel_1d_f_i8,
 310       fetch_texel_2d_f_i8,
 311       fetch_texel_3d_f_i8
 312    },
 313    {
 314       MESA_FORMAT_I16,
 315       fetch_texel_1d_f_i16,
 316       fetch_texel_2d_f_i16,
 317       fetch_texel_3d_f_i16
 318    },
 319    {
 320       MESA_FORMAT_YCBCR,
 321       fetch_texel_1d_f_ycbcr,
 322       fetch_texel_2d_f_ycbcr,
 323       fetch_texel_3d_f_ycbcr
 324    },
 325    {
 326       MESA_FORMAT_YCBCR_REV,
 327       fetch_texel_1d_f_ycbcr_rev,
 328       fetch_texel_2d_f_ycbcr_rev,
 329       fetch_texel_3d_f_ycbcr_rev
 330    },
 331    {
 332       MESA_FORMAT_R8,
 333       fetch_texel_1d_f_r8,
 334       fetch_texel_2d_f_r8,
 335       fetch_texel_3d_f_r8
 336    },
 337    {
 338       MESA_FORMAT_GR88,
 339       fetch_texel_1d_f_gr88,
 340       fetch_texel_2d_f_gr88,
 341       fetch_texel_3d_f_gr88
 342    },
 343    {
 344       MESA_FORMAT_RG88,
 345       fetch_texel_1d_f_rg88,
 346       fetch_texel_2d_f_rg88,
 347       fetch_texel_3d_f_rg88
 348    },
 349    {
 350       MESA_FORMAT_R16,
 351       fetch_texel_1d_f_r16,
 352       fetch_texel_2d_f_r16,
 353       fetch_texel_3d_f_r16
 354    },
 355    {
 356       MESA_FORMAT_GR1616,
 357       fetch_texel_1d_f_rg1616,
 358       fetch_texel_2d_f_rg1616,
 359       fetch_texel_3d_f_rg1616
 360    },
 361    {
 362       MESA_FORMAT_RG1616,
 363       fetch_texel_1d_f_rg1616_rev,
 364       fetch_texel_2d_f_rg1616_rev,
 365       fetch_texel_3d_f_rg1616_rev
 366    },
 367    {
 368       MESA_FORMAT_ARGB2101010,
 369       fetch_texel_1d_f_argb2101010,
 370       fetch_texel_2d_f_argb2101010,
 371       fetch_texel_3d_f_argb2101010
 372    },
 373    {
 374       MESA_FORMAT_Z24_S8,
 375       fetch_texel_1d_f_z24_s8,
 376       fetch_texel_2d_f_z24_s8,
 377       fetch_texel_3d_f_z24_s8
 378    },
 379    {
 380       MESA_FORMAT_S8_Z24,
 381       fetch_texel_1d_f_s8_z24,
 382       fetch_texel_2d_f_s8_z24,
 383       fetch_texel_3d_f_s8_z24
 384    },
 385    {
 386       MESA_FORMAT_Z16,
 387       fetch_texel_1d_f_z16,
 388       fetch_texel_2d_f_z16,
 389       fetch_texel_3d_f_z16
 390    },
 391    {
 392       MESA_FORMAT_X8_Z24,
 393       fetch_texel_1d_f_s8_z24,
 394       fetch_texel_2d_f_s8_z24,
 395       fetch_texel_3d_f_s8_z24
 396    },
 397    {
 398       MESA_FORMAT_Z24_X8,
 399       fetch_texel_1d_f_z24_s8,
 400       fetch_texel_2d_f_z24_s8,
 401       fetch_texel_3d_f_z24_s8
 402    },
 403    {
 404       MESA_FORMAT_Z32,
 405       fetch_texel_1d_f_z32,
 406       fetch_texel_2d_f_z32,
 407       fetch_texel_3d_f_z32
 408    },
 409    {
 410       MESA_FORMAT_S8,
 411       NULL,
 412       NULL,
 413       NULL
 414    },
 415    {
 416       MESA_FORMAT_SRGB8,
 417       fetch_texel_1d_srgb8,
 418       fetch_texel_2d_srgb8,
 419       fetch_texel_3d_srgb8
 420    },
 421    {
 422       MESA_FORMAT_SRGBA8,
 423       fetch_texel_1d_srgba8,
 424       fetch_texel_2d_srgba8,
 425       fetch_texel_3d_srgba8
 426    },
 427    {
 428       MESA_FORMAT_SARGB8,
 429       fetch_texel_1d_sargb8,
 430       fetch_texel_2d_sargb8,
 431       fetch_texel_3d_sargb8
 432    },
 433    {
 434       MESA_FORMAT_SL8,
 435       fetch_texel_1d_sl8,
 436       fetch_texel_2d_sl8,
 437       fetch_texel_3d_sl8
 438    },
 439    {
 440       MESA_FORMAT_SLA8,
 441       fetch_texel_1d_sla8,
 442       fetch_texel_2d_sla8,
 443       fetch_texel_3d_sla8
 444    },
 445    {
 446       MESA_FORMAT_SRGB_DXT1,
 447       fetch_compressed,
 448       fetch_compressed,
 449       fetch_compressed
 450    },
 451    {
 452       MESA_FORMAT_SRGBA_DXT1,
 453       fetch_compressed,
 454       fetch_compressed,
 455       fetch_compressed
 456    },
 457    {
 458       MESA_FORMAT_SRGBA_DXT3,
 459       fetch_compressed,
 460       fetch_compressed,
 461       fetch_compressed
 462    },
 463    {
 464       MESA_FORMAT_SRGBA_DXT5,
 465       fetch_compressed,
 466       fetch_compressed,
 467       fetch_compressed
 468    },
 469
 470    {
 471       MESA_FORMAT_RGB_FXT1,
 472       fetch_compressed,
 473       fetch_compressed,
 474       fetch_compressed
 475    },
 476    {
 477       MESA_FORMAT_RGBA_FXT1,
 478       fetch_compressed,
 479       fetch_compressed,
 480       fetch_compressed
 481    },
 482    {
 483       MESA_FORMAT_RGB_DXT1,
 484       fetch_compressed,
 485       fetch_compressed,
 486       fetch_compressed
 487    },
 488    {
 489       MESA_FORMAT_RGBA_DXT1,
 490       fetch_compressed,
 491       fetch_compressed,
 492       fetch_compressed
 493    },
 494    {
 495       MESA_FORMAT_RGBA_DXT3,
 496       fetch_compressed,
 497       fetch_compressed,
 498       fetch_compressed
 499    },
 500    {
 501       MESA_FORMAT_RGBA_DXT5,
 502       fetch_compressed,
 503       fetch_compressed,
 504       fetch_compressed
 505    },
 506    {
 507       MESA_FORMAT_RGBA_FLOAT32,
 508       fetch_texel_1d_f_rgba_f32,
 509       fetch_texel_2d_f_rgba_f32,
 510       fetch_texel_3d_f_rgba_f32
 511    },
 512    {
 513       MESA_FORMAT_RGBA_FLOAT16,
 514       fetch_texel_1d_f_rgba_f16,
 515       fetch_texel_2d_f_rgba_f16,
 516       fetch_texel_3d_f_rgba_f16
 517    },
 518    {
 519       MESA_FORMAT_RGB_FLOAT32,
 520       fetch_texel_1d_f_rgb_f32,
 521       fetch_texel_2d_f_rgb_f32,
 522       fetch_texel_3d_f_rgb_f32
 523    },
 524    {
 525       MESA_FORMAT_RGB_FLOAT16,
 526       fetch_texel_1d_f_rgb_f16,
 527       fetch_texel_2d_f_rgb_f16,
 528       fetch_texel_3d_f_rgb_f16
 529    },
 530    {
 531       MESA_FORMAT_ALPHA_FLOAT32,
 532       fetch_texel_1d_f_alpha_f32,
 533       fetch_texel_2d_f_alpha_f32,
 534       fetch_texel_3d_f_alpha_f32
 535    },
 536    {
 537       MESA_FORMAT_ALPHA_FLOAT16,
 538       fetch_texel_1d_f_alpha_f16,
 539       fetch_texel_2d_f_alpha_f16,
 540       fetch_texel_3d_f_alpha_f16
 541    },
 542    {
 543       MESA_FORMAT_LUMINANCE_FLOAT32,
 544       fetch_texel_1d_f_luminance_f32,
 545       fetch_texel_2d_f_luminance_f32,
 546       fetch_texel_3d_f_luminance_f32
 547    },
 548    {
 549       MESA_FORMAT_LUMINANCE_FLOAT16,
 550       fetch_texel_1d_f_luminance_f16,
 551       fetch_texel_2d_f_luminance_f16,
 552       fetch_texel_3d_f_luminance_f16
 553    },
 554    {
 555       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32,
 556       fetch_texel_1d_f_luminance_alpha_f32,
 557       fetch_texel_2d_f_luminance_alpha_f32,
 558       fetch_texel_3d_f_luminance_alpha_f32
 559    },
 560    {
 561       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16,
 562       fetch_texel_1d_f_luminance_alpha_f16,
 563       fetch_texel_2d_f_luminance_alpha_f16,
 564       fetch_texel_3d_f_luminance_alpha_f16
 565    },
 566    {
 567       MESA_FORMAT_INTENSITY_FLOAT32,
 568       fetch_texel_1d_f_intensity_f32,
 569       fetch_texel_2d_f_intensity_f32,
 570       fetch_texel_3d_f_intensity_f32
 571    },
 572    {
 573       MESA_FORMAT_INTENSITY_FLOAT16,
 574       fetch_texel_1d_f_intensity_f16,
 575       fetch_texel_2d_f_intensity_f16,
 576       fetch_texel_3d_f_intensity_f16
 577    },
 578    {
 579       MESA_FORMAT_R_FLOAT32,
 580       fetch_texel_1d_f_r_f32,
 581       fetch_texel_2d_f_r_f32,
 582       fetch_texel_3d_f_r_f32
 583    },
 584    {
 585       MESA_FORMAT_R_FLOAT16,
 586       fetch_texel_1d_f_r_f16,
 587       fetch_texel_2d_f_r_f16,
 588       fetch_texel_3d_f_r_f16
 589    },
 590    {
 591       MESA_FORMAT_RG_FLOAT32,
 592       fetch_texel_1d_f_rg_f32,
 593       fetch_texel_2d_f_rg_f32,
 594       fetch_texel_3d_f_rg_f32
 595    },
 596    {
 597       MESA_FORMAT_RG_FLOAT16,
 598       fetch_texel_1d_f_rg_f16,
 599       fetch_texel_2d_f_rg_f16,
 600       fetch_texel_3d_f_rg_f16
 601    },
 602
 603    {
 604       MESA_FORMAT_ALPHA_UINT8,
 605       NULL,
 606       NULL,
 607       NULL
 608    },
 609
 610    {
 611       MESA_FORMAT_ALPHA_UINT16,
 612       NULL,
 613       NULL,
 614       NULL
 615    },
 616
 617    {
 618       MESA_FORMAT_ALPHA_UINT32,
 619       NULL,
 620       NULL,
 621       NULL
 622    },
 623
 624    {
 625       MESA_FORMAT_ALPHA_INT8,
 626       NULL,
 627       NULL,
 628       NULL
 629    },
 630
 631    {
 632       MESA_FORMAT_ALPHA_INT16,
 633       NULL,
 634       NULL,
 635       NULL
 636    },
 637
 638    {
 639       MESA_FORMAT_ALPHA_INT32,
 640       NULL,
 641       NULL,
 642       NULL
 643    },
 644
 645
 646    {
 647       MESA_FORMAT_INTENSITY_UINT8,
 648       NULL,
 649       NULL,
 650       NULL
 651    },
 652
 653    {
 654       MESA_FORMAT_INTENSITY_UINT16,
 655       NULL,
 656       NULL,
 657       NULL
 658    },
 659
 660    {
 661       MESA_FORMAT_INTENSITY_UINT32,
 662       NULL,
 663       NULL,
 664       NULL
 665    },
 666
 667    {
 668       MESA_FORMAT_INTENSITY_INT8,
 669       NULL,
 670       NULL,
 671       NULL
 672    },
 673
 674    {
 675       MESA_FORMAT_INTENSITY_INT16,
 676       NULL,
 677       NULL,
 678       NULL
 679    },
 680
 681    {
 682       MESA_FORMAT_INTENSITY_INT32,
 683       NULL,
 684       NULL,
 685       NULL
 686    },
 687
 688
 689    {
 690       MESA_FORMAT_LUMINANCE_UINT8,
 691       NULL,
 692       NULL,
 693       NULL
 694    },
 695
 696    {
 697       MESA_FORMAT_LUMINANCE_UINT16,
 698       NULL,
 699       NULL,
 700       NULL
 701    },
 702
 703    {
 704       MESA_FORMAT_LUMINANCE_UINT32,
 705       NULL,
 706       NULL,
 707       NULL
 708    },
 709
 710    {
 711       MESA_FORMAT_LUMINANCE_INT8,
 712       NULL,
 713       NULL,
 714       NULL
 715    },
 716
 717    {
 718       MESA_FORMAT_LUMINANCE_INT16,
 719       NULL,
 720       NULL,
 721       NULL
 722    },
 723
 724    {
 725       MESA_FORMAT_LUMINANCE_INT32,
 726       NULL,
 727       NULL,
 728       NULL
 729    },
 730
 731
 732    {
 733       MESA_FORMAT_LUMINANCE_ALPHA_UINT8,
 734       NULL,
 735       NULL,
 736       NULL
 737    },
 738
 739    {
 740       MESA_FORMAT_LUMINANCE_ALPHA_UINT16,
 741       NULL,
 742       NULL,
 743       NULL
 744    },
 745
 746    {
 747       MESA_FORMAT_LUMINANCE_ALPHA_UINT32,
 748       NULL,
 749       NULL,
 750       NULL
 751    },
 752
 753    {
 754       MESA_FORMAT_LUMINANCE_ALPHA_INT8,
 755       NULL,
 756       NULL,
 757       NULL
 758    },
 759
 760    {
 761       MESA_FORMAT_LUMINANCE_ALPHA_INT16,
 762       NULL,
 763       NULL,
 764       NULL
 765    },
 766
 767    {
 768       MESA_FORMAT_LUMINANCE_ALPHA_INT32,
 769       NULL,
 770       NULL,
 771       NULL
 772    },
 773
 774
 775    {
 776       MESA_FORMAT_R_INT8,
 777       NULL,
 778       NULL,
 779       NULL
 780    },
 781
 782    {
 783       MESA_FORMAT_RG_INT8,
 784       NULL,
 785       NULL,
 786       NULL
 787    },
 788
 789    {
 790       MESA_FORMAT_RGB_INT8,
 791       NULL,
 792       NULL,
 793       NULL
 794    },
 795
 796    /* non-normalized, signed int */
 797    {
 798       MESA_FORMAT_RGBA_INT8,
 799       fetch_texel_1d_rgba_int8,
 800       fetch_texel_2d_rgba_int8,
 801       fetch_texel_3d_rgba_int8
 802    },
 803    {
 804       MESA_FORMAT_R_INT16,
 805       NULL,
 806       NULL,
 807       NULL
 808    },
 809    {
 810       MESA_FORMAT_RG_INT16,
 811       NULL,
 812       NULL,
 813       NULL
 814    },
 815    {
 816       MESA_FORMAT_RGB_INT16,
 817       NULL,
 818       NULL,
 819       NULL
 820    },
 821    {
 822       MESA_FORMAT_RGBA_INT16,
 823       fetch_texel_1d_rgba_int16,
 824       fetch_texel_2d_rgba_int16,
 825       fetch_texel_3d_rgba_int16
 826    },
 827    {
 828       MESA_FORMAT_R_INT32,
 829       NULL,
 830       NULL,
 831       NULL
 832    },
 833    {
 834       MESA_FORMAT_RG_INT32,
 835       NULL,
 836       NULL,
 837       NULL
 838    },
 839    {
 840       MESA_FORMAT_RGB_INT32,
 841       NULL,
 842       NULL,
 843       NULL
 844    },
 845    {
 846       MESA_FORMAT_RGBA_INT32,
 847       fetch_texel_1d_rgba_int32,
 848       fetch_texel_2d_rgba_int32,
 849       fetch_texel_3d_rgba_int32
 850    },
 851
 852    /* non-normalized, unsigned int */
 853    {
 854       MESA_FORMAT_R_UINT8,
 855       NULL,
 856       NULL,
 857       NULL
 858    },
 859    {
 860       MESA_FORMAT_RG_UINT8,
 861       NULL,
 862       NULL,
 863       NULL
 864    },
 865    {
 866       MESA_FORMAT_RGB_UINT8,
 867       NULL,
 868       NULL,
 869       NULL
 870    },
 871    {
 872       MESA_FORMAT_RGBA_UINT8,
 873       fetch_texel_1d_rgba_uint8,
 874       fetch_texel_2d_rgba_uint8,
 875       fetch_texel_3d_rgba_uint8
 876    },
 877    {
 878       MESA_FORMAT_R_UINT16,
 879       NULL,
 880       NULL,
 881       NULL
 882    },
 883    {
 884       MESA_FORMAT_RG_UINT16,
 885       NULL,
 886       NULL,
 887       NULL
 888    },
 889    {
 890       MESA_FORMAT_RGB_UINT16,
 891       NULL,
 892       NULL,
 893       NULL
 894    },
 895    {
 896       MESA_FORMAT_RGBA_UINT16,
 897       fetch_texel_1d_rgba_uint16,
 898       fetch_texel_2d_rgba_uint16,
 899       fetch_texel_3d_rgba_uint16
 900    },
 901    {
 902       MESA_FORMAT_R_UINT32,
 903       NULL,
 904       NULL,
 905       NULL
 906    },
 907    {
 908       MESA_FORMAT_RG_UINT32,
 909       NULL,
 910       NULL,
 911       NULL
 912    },
 913    {
 914       MESA_FORMAT_RGB_UINT32,
 915       NULL,
 916       NULL,
 917       NULL
 918    },
 919    {
 920       MESA_FORMAT_RGBA_UINT32,
 921       fetch_texel_1d_rgba_uint32,
 922       fetch_texel_2d_rgba_uint32,
 923       fetch_texel_3d_rgba_uint32
 924    },
 925
 926    /* dudv */
 927    {
 928       MESA_FORMAT_DUDV8,
 929       fetch_texel_1d_dudv8,
 930       fetch_texel_2d_dudv8,
 931       fetch_texel_3d_dudv8
 932    },
 933
 934    /* signed, normalized */
 935    {
 936       MESA_FORMAT_SIGNED_R8,
 937       fetch_texel_1d_signed_r8,
 938       fetch_texel_2d_signed_r8,
 939       fetch_texel_3d_signed_r8
 940    },
 941    {
 942       MESA_FORMAT_SIGNED_RG88_REV,
 943       fetch_texel_1d_signed_rg88_rev,
 944       fetch_texel_2d_signed_rg88_rev,
 945       fetch_texel_3d_signed_rg88_rev
 946    },
 947    {
 948       MESA_FORMAT_SIGNED_RGBX8888,
 949       fetch_texel_1d_signed_rgbx8888,
 950       fetch_texel_2d_signed_rgbx8888,
 951       fetch_texel_3d_signed_rgbx8888
 952    },
 953    {
 954       MESA_FORMAT_SIGNED_RGBA8888,
 955       fetch_texel_1d_signed_rgba8888,
 956       fetch_texel_2d_signed_rgba8888,
 957       fetch_texel_3d_signed_rgba8888
 958    },
 959    {
 960       MESA_FORMAT_SIGNED_RGBA8888_REV,
 961       fetch_texel_1d_signed_rgba8888_rev,
 962       fetch_texel_2d_signed_rgba8888_rev,
 963       fetch_texel_3d_signed_rgba8888_rev
 964    },
 965    {
 966       MESA_FORMAT_SIGNED_R16,
 967       fetch_texel_1d_signed_r16,
 968       fetch_texel_2d_signed_r16,
 969       fetch_texel_3d_signed_r16
 970    },
 971    {
 972       MESA_FORMAT_SIGNED_GR1616,
 973       fetch_texel_1d_signed_rg1616,
 974       fetch_texel_2d_signed_rg1616,
 975       fetch_texel_3d_signed_rg1616
 976    },
 977    {
 978       MESA_FORMAT_SIGNED_RGB_16,
 979       fetch_texel_1d_signed_rgb_16,
 980       fetch_texel_2d_signed_rgb_16,
 981       fetch_texel_3d_signed_rgb_16
 982    },
 983    {
 984       MESA_FORMAT_SIGNED_RGBA_16,
 985       fetch_texel_1d_signed_rgba_16,
 986       fetch_texel_2d_signed_rgba_16,
 987       fetch_texel_3d_signed_rgba_16
 988    },
 989    {
 990       MESA_FORMAT_RGBA_16,
 991       fetch_texel_1d_rgba_16,
 992       fetch_texel_2d_rgba_16,
 993       fetch_texel_3d_rgba_16
 994    },
 995    {
 996       MESA_FORMAT_RED_RGTC1,
 997       fetch_compressed,
 998       fetch_compressed,
 999       fetch_compressed
1000    },
1001    {
1002       MESA_FORMAT_SIGNED_RED_RGTC1,
1003       fetch_compressed,
1004       fetch_compressed,
1005       fetch_compressed
1006    },
1007    {
1008       MESA_FORMAT_RG_RGTC2,
1009       fetch_compressed,
1010       fetch_compressed,
1011       fetch_compressed
1012    },
1013    {
1014       MESA_FORMAT_SIGNED_RG_RGTC2,
1015       fetch_compressed,
1016       fetch_compressed,
1017       fetch_compressed
1018    },
1019    {
1020       MESA_FORMAT_L_LATC1,
1021       fetch_compressed,
1022       fetch_compressed,
1023       fetch_compressed
1024    },
1025    {
1026       MESA_FORMAT_SIGNED_L_LATC1,
1027       fetch_compressed,
1028       fetch_compressed,
1029       fetch_compressed
1030    },
1031    {
1032       MESA_FORMAT_LA_LATC2,
1033       fetch_compressed,
1034       fetch_compressed,
1035       fetch_compressed
1036    },
1037    {
1038       MESA_FORMAT_SIGNED_LA_LATC2,
1039       fetch_compressed,
1040       fetch_compressed,
1041       fetch_compressed
1042    },
1043    {
1044       MESA_FORMAT_ETC1_RGB8,
1045       fetch_compressed,
1046       fetch_compressed,
1047       fetch_compressed
1048    },
1049    {
1050       MESA_FORMAT_ETC2_RGB8,
1051       fetch_compressed,
1052       fetch_compressed,
1053       fetch_compressed
1054    },
1055    {
1056       MESA_FORMAT_ETC2_SRGB8,
1057       fetch_compressed,
1058       fetch_compressed,
1059       fetch_compressed
1060    },
1061    {
1062       MESA_FORMAT_ETC2_RGBA8_EAC,
1063       fetch_compressed,
1064       fetch_compressed,
1065       fetch_compressed
1066    },
1067    {
1068       MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC,
1069       fetch_compressed,
1070       fetch_compressed,
1071       fetch_compressed
1072    },
1073    {
1074       MESA_FORMAT_ETC2_R11_EAC,
1075       fetch_compressed,
1076       fetch_compressed,
1077       fetch_compressed
1078    },
1079    {
1080       MESA_FORMAT_ETC2_RG11_EAC,
1081       fetch_compressed,
1082       fetch_compressed,
1083       fetch_compressed
1084    },
1085    {
1086       MESA_FORMAT_ETC2_SIGNED_R11_EAC,
1087       fetch_compressed,
1088       fetch_compressed,
1089       fetch_compressed
1090    },
1091    {
1092       MESA_FORMAT_ETC2_SIGNED_RG11_EAC,
1093       fetch_compressed,
1094       fetch_compressed,
1095       fetch_compressed
1096    },
1097    {
1098       MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1,
1099       fetch_compressed,
1100       fetch_compressed,
1101       fetch_compressed
1102    },
1103    {
1104       MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1,
1105       fetch_compressed,
1106       fetch_compressed,
1107       fetch_compressed
1108    },
1109    {
1110       MESA_FORMAT_SIGNED_A8,
1111       fetch_texel_1d_signed_a8,
1112       fetch_texel_2d_signed_a8,
1113       fetch_texel_3d_signed_a8
1114    },
1115    {
1116       MESA_FORMAT_SIGNED_L8,
1117       fetch_texel_1d_signed_l8,
1118       fetch_texel_2d_signed_l8,
1119       fetch_texel_3d_signed_l8
1120    },
1121    {
1122       MESA_FORMAT_SIGNED_AL88,
1123       fetch_texel_1d_signed_al88,
1124       fetch_texel_2d_signed_al88,
1125       fetch_texel_3d_signed_al88
1126    },
1127    {
1128       MESA_FORMAT_SIGNED_I8,
1129       fetch_texel_1d_signed_i8,
1130       fetch_texel_2d_signed_i8,
1131       fetch_texel_3d_signed_i8
1132    },
1133    {
1134       MESA_FORMAT_SIGNED_A16,
1135       fetch_texel_1d_signed_a16,
1136       fetch_texel_2d_signed_a16,
1137       fetch_texel_3d_signed_a16
1138    },
1139    {
1140       MESA_FORMAT_SIGNED_L16,
1141       fetch_texel_1d_signed_l16,
1142       fetch_texel_2d_signed_l16,
1143       fetch_texel_3d_signed_l16
1144    },
1145    {
1146       MESA_FORMAT_SIGNED_AL1616,
1147       fetch_texel_1d_signed_al1616,
1148       fetch_texel_2d_signed_al1616,
1149       fetch_texel_3d_signed_al1616
1150    },
1151    {
1152       MESA_FORMAT_SIGNED_I16,
1153       fetch_texel_1d_signed_i16,
1154       fetch_texel_2d_signed_i16,
1155       fetch_texel_3d_signed_i16
1156    },
1157    {
1158       MESA_FORMAT_RGB9_E5_FLOAT,
1159       fetch_texel_1d_rgb9_e5,
1160       fetch_texel_2d_rgb9_e5,
1161       fetch_texel_3d_rgb9_e5
1162    },
1163    {
1164       MESA_FORMAT_R11_G11_B10_FLOAT,
1165       fetch_texel_1d_r11_g11_b10f,
1166       fetch_texel_2d_r11_g11_b10f,
1167       fetch_texel_3d_r11_g11_b10f
1168    },
1169    {
1170       MESA_FORMAT_Z32_FLOAT,
1171       fetch_texel_1d_f_r_f32, /* Reuse the R32F functions. */
1172       fetch_texel_2d_f_r_f32,
1173       fetch_texel_3d_f_r_f32
1174    },
1175    {
1176       MESA_FORMAT_Z32_FLOAT_X24S8,
1177       fetch_texel_1d_z32f_x24s8,
1178       fetch_texel_2d_z32f_x24s8,
1179       fetch_texel_3d_z32f_x24s8
1180    },
1181    {
1182       MESA_FORMAT_ARGB2101010_UINT,
1183       NULL,
1184       NULL,
1185       NULL
1186    },
1187    {
1188       MESA_FORMAT_ABGR2101010_UINT,
1189       NULL,
1190       NULL,
1191       NULL
1192    },
1193    {
1194       MESA_FORMAT_XRGB4444_UNORM,
1195       NULL,
1196       NULL,
1197       NULL
1198    },
1199    {
1200       MESA_FORMAT_XRGB1555_UNORM,
1201       NULL,
1202       NULL,
1203       NULL
1204    },
1205    {
1206       MESA_FORMAT_XBGR8888_SNORM,
1207       NULL,
1208       NULL,
1209       NULL
1210    },
1211    {
1212       MESA_FORMAT_XBGR8888_SRGB,
1213       NULL,
1214       NULL,
1215       NULL
1216    },
1217    {
1218       MESA_FORMAT_XBGR8888_UINT,
1219       NULL,
1220       NULL,
1221       NULL
1222    },
1223    {
1224       MESA_FORMAT_XBGR8888_SINT,
1225       NULL,
1226       NULL,
1227       NULL
1228    },
1229    {
1230       MESA_FORMAT_XRGB2101010_UNORM,
1231       NULL,
1232       NULL,
1233       NULL
1234    },
1235    {
1236       MESA_FORMAT_XBGR16161616_UNORM,
1237       NULL,
1238       NULL,
1239       NULL
1240    },
1241    {
1242       MESA_FORMAT_XBGR16161616_SNORM,
1243       NULL,
1244       NULL,
1245       NULL
1246    },
1247    {
1248       MESA_FORMAT_XBGR16161616_FLOAT,
1249       NULL,
1250       NULL,
1251       NULL
1252    },
1253    {
1254       MESA_FORMAT_XBGR16161616_UINT,
1255       NULL,
1256       NULL,
1257       NULL
1258    },
1259    {
1260       MESA_FORMAT_XBGR16161616_SINT,
1261       NULL,
1262       NULL,
1263       NULL
1264    },
1265    {
1266       MESA_FORMAT_XBGR32323232_FLOAT,
1267       NULL,
1268       NULL,
1269       NULL
1270    },
1271    {
1272       MESA_FORMAT_XBGR32323232_UINT,
1273       NULL,
1274       NULL,
1275       NULL
1276    },
1277    {
1278       MESA_FORMAT_XBGR32323232_SINT,
1279       NULL,
1280       NULL,
1281       NULL
1282    },
1283 };
1284
1285
1286 /**
1287  * Initialize the texture image's FetchTexel methods.
1288  */
1289 static void
1290 set_fetch_functions(const struct gl_sampler_object *samp,
1291                     struct swrast_texture_image *texImage, GLuint dims)
1292 {
1293    gl_format format = texImage->Base.TexFormat;
1294
1295 #ifdef DEBUG
1296    /* check that the table entries are sorted by format name */
1297    gl_format fmt;
1298    for (fmt = 0; fmt < MESA_FORMAT_COUNT; fmt++) {
1299       assert(texfetch_funcs[fmt].Name == fmt);
1300    }
1301 #endif
1302
1303    STATIC_ASSERT(Elements(texfetch_funcs) == MESA_FORMAT_COUNT);
1304
1305    if (samp->sRGBDecode == GL_SKIP_DECODE_EXT &&
1306        _mesa_get_format_color_encoding(format) == GL_SRGB) {
1307       format = _mesa_get_srgb_format_linear(format);
1308    }
1309
1310    assert(format < MESA_FORMAT_COUNT);
1311
1312    switch (dims) {
1313    case 1:
1314       texImage->FetchTexel = texfetch_funcs[format].Fetch1D;
1315       break;
1316    case 2:
1317       texImage->FetchTexel = texfetch_funcs[format].Fetch2D;
1318       break;
1319    case 3:
1320       texImage->FetchTexel = texfetch_funcs[format].Fetch3D;
1321       break;
1322    default:
1323       assert(!"Bad dims in set_fetch_functions()");
1324    }
1325
1326    texImage->FetchCompressedTexel = _mesa_get_compressed_fetch_func(format);
1327
1328    ASSERT(texImage->FetchTexel);
1329 }
1330
1331 void
1332 _mesa_update_fetch_functions(struct gl_context *ctx, GLuint unit)
1333 {
1334    struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
1335    struct gl_sampler_object *samp;
1336    GLuint face, i;
1337    GLuint dims;
1338
1339    if (!texObj)
1340       return;
1341
1342    samp = _mesa_get_samplerobj(ctx, unit);
1343
1344    dims = _mesa_get_texture_dimensions(texObj->Target);
1345
1346    for (face = 0; face < 6; face++) {
1347       for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
1348          if (texObj->Image[face][i]) {
1349             set_fetch_functions(samp,
1350                                 swrast_texture_image(texObj->Image[face][i]),
1351                                 dims);
1352          }
1353       }
1354    }
1355 }