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/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 "s_context.h"
  45 #include "s_texfetch.h"
  46 #include "../../gallium/auxiliary/util/u_format_rgb9e5.h"
  47 #include "../../gallium/auxiliary/util/u_format_r11g11b10f.h"
  48
  49
  50 /**
  51  * Convert an 8-bit sRGB value from non-linear space to a
  52  * linear RGB value in [0, 1].
  53  * Implemented with a 256-entry lookup table.
  54  */
  55 static inline GLfloat
  56 nonlinear_to_linear(GLubyte cs8)
  57 {
  58    static GLfloat table[256];
  59    static GLboolean tableReady = GL_FALSE;
  60    if (!tableReady) {
  61       /* compute lookup table now */
  62       GLuint i;
  63       for (i = 0; i < 256; i++) {
  64          const GLfloat cs = UBYTE_TO_FLOAT(i);
  65          if (cs <= 0.04045) {
  66             table[i] = cs / 12.92f;
  67          }
  68          else {
  69             table[i] = (GLfloat) pow((cs + 0.055) / 1.055, 2.4);
  70          }
  71       }
  72       tableReady = GL_TRUE;
  73    }
  74    return table[cs8];
  75 }
  76
  77
  78
  79 /* Texel fetch routines for all supported formats
  80  */
  81 #define DIM 1
  82 #include "s_texfetch_tmp.h"
  83
  84 #define DIM 2
  85 #include "s_texfetch_tmp.h"
  86
  87 #define DIM 3
  88 #include "s_texfetch_tmp.h"
  89
  90 /**
  91  * Null texel fetch function.
  92  *
  93  * Have to have this so the FetchTexel function pointer is never NULL.
  94  */
  95 static void fetch_null_texelf( const struct swrast_texture_image *texImage,
  96                                GLint i, GLint j, GLint k, GLfloat *texel )
  97 {
  98    (void) texImage; (void) i; (void) j; (void) k;
  99    texel[RCOMP] = 0.0;
 100    texel[GCOMP] = 0.0;
 101    texel[BCOMP] = 0.0;
 102    texel[ACOMP] = 0.0;
 103    _mesa_warning(NULL, "fetch_null_texelf() called!");
 104 }
 105
 106
 107 /**
 108  * Table to map MESA_FORMAT_ to texel fetch/store funcs.
 109  * XXX this is somewhat temporary.
 110  */
 111 static struct {
 112    gl_format Name;
 113    FetchTexelFunc Fetch1D;
 114    FetchTexelFunc Fetch2D;
 115    FetchTexelFunc Fetch3D;
 116 }
 117 texfetch_funcs[MESA_FORMAT_COUNT] =
 118 {
 119    {
 120       MESA_FORMAT_NONE,
 121       fetch_null_texelf,
 122       fetch_null_texelf,
 123       fetch_null_texelf
 124    },
 125
 126    {
 127       MESA_FORMAT_RGBA8888,
 128       fetch_texel_1d_f_rgba8888,
 129       fetch_texel_2d_f_rgba8888,
 130       fetch_texel_3d_f_rgba8888
 131    },
 132    {
 133       MESA_FORMAT_RGBA8888_REV,
 134       fetch_texel_1d_f_rgba8888_rev,
 135       fetch_texel_2d_f_rgba8888_rev,
 136       fetch_texel_3d_f_rgba8888_rev
 137    },
 138    {
 139       MESA_FORMAT_ARGB8888,
 140       fetch_texel_1d_f_argb8888,
 141       fetch_texel_2d_f_argb8888,
 142       fetch_texel_3d_f_argb8888
 143    },
 144    {
 145       MESA_FORMAT_ARGB8888_REV,
 146       fetch_texel_1d_f_argb8888_rev,
 147       fetch_texel_2d_f_argb8888_rev,
 148       fetch_texel_3d_f_argb8888_rev
 149    },
 150    {
 151       MESA_FORMAT_RGBX8888,
 152       fetch_texel_1d_f_rgbx8888,
 153       fetch_texel_2d_f_rgbx8888,
 154       fetch_texel_3d_f_rgbx8888
 155    },
 156    {
 157       MESA_FORMAT_RGBX8888_REV,
 158       fetch_texel_1d_f_rgbx8888_rev,
 159       fetch_texel_2d_f_rgbx8888_rev,
 160       fetch_texel_3d_f_rgbx8888_rev
 161    },
 162    {
 163       MESA_FORMAT_XRGB8888,
 164       fetch_texel_1d_f_xrgb8888,
 165       fetch_texel_2d_f_xrgb8888,
 166       fetch_texel_3d_f_xrgb8888
 167    },
 168    {
 169       MESA_FORMAT_XRGB8888_REV,
 170       fetch_texel_1d_f_xrgb8888_rev,
 171       fetch_texel_2d_f_xrgb8888_rev,
 172       fetch_texel_3d_f_xrgb8888_rev
 173    },
 174    {
 175       MESA_FORMAT_RGB888,
 176       fetch_texel_1d_f_rgb888,
 177       fetch_texel_2d_f_rgb888,
 178       fetch_texel_3d_f_rgb888
 179    },
 180    {
 181       MESA_FORMAT_BGR888,
 182       fetch_texel_1d_f_bgr888,
 183       fetch_texel_2d_f_bgr888,
 184       fetch_texel_3d_f_bgr888
 185    },
 186    {
 187       MESA_FORMAT_RGB565,
 188       fetch_texel_1d_f_rgb565,
 189       fetch_texel_2d_f_rgb565,
 190       fetch_texel_3d_f_rgb565
 191    },
 192    {
 193       MESA_FORMAT_RGB565_REV,
 194       fetch_texel_1d_f_rgb565_rev,
 195       fetch_texel_2d_f_rgb565_rev,
 196       fetch_texel_3d_f_rgb565_rev
 197    },
 198    {
 199       MESA_FORMAT_ARGB4444,
 200       fetch_texel_1d_f_argb4444,
 201       fetch_texel_2d_f_argb4444,
 202       fetch_texel_3d_f_argb4444
 203    },
 204    {
 205       MESA_FORMAT_ARGB4444_REV,
 206       fetch_texel_1d_f_argb4444_rev,
 207       fetch_texel_2d_f_argb4444_rev,
 208       fetch_texel_3d_f_argb4444_rev
 209    },
 210    {
 211       MESA_FORMAT_RGBA5551,
 212       fetch_texel_1d_f_rgba5551,
 213       fetch_texel_2d_f_rgba5551,
 214       fetch_texel_3d_f_rgba5551
 215    },
 216    {
 217       MESA_FORMAT_ARGB1555,
 218       fetch_texel_1d_f_argb1555,
 219       fetch_texel_2d_f_argb1555,
 220       fetch_texel_3d_f_argb1555
 221    },
 222    {
 223       MESA_FORMAT_ARGB1555_REV,
 224       fetch_texel_1d_f_argb1555_rev,
 225       fetch_texel_2d_f_argb1555_rev,
 226       fetch_texel_3d_f_argb1555_rev
 227    },
 228    {
 229       MESA_FORMAT_AL44,
 230       fetch_texel_1d_f_al44,
 231       fetch_texel_2d_f_al44,
 232       fetch_texel_3d_f_al44
 233    },
 234    {
 235       MESA_FORMAT_AL88,
 236       fetch_texel_1d_f_al88,
 237       fetch_texel_2d_f_al88,
 238       fetch_texel_3d_f_al88
 239    },
 240    {
 241       MESA_FORMAT_AL88_REV,
 242       fetch_texel_1d_f_al88_rev,
 243       fetch_texel_2d_f_al88_rev,
 244       fetch_texel_3d_f_al88_rev
 245    },
 246    {
 247       MESA_FORMAT_AL1616,
 248       fetch_texel_1d_f_al1616,
 249       fetch_texel_2d_f_al1616,
 250       fetch_texel_3d_f_al1616
 251    },
 252    {
 253       MESA_FORMAT_AL1616_REV,
 254       fetch_texel_1d_f_al1616_rev,
 255       fetch_texel_2d_f_al1616_rev,
 256       fetch_texel_3d_f_al1616_rev
 257    },
 258    {
 259       MESA_FORMAT_RGB332,
 260       fetch_texel_1d_f_rgb332,
 261       fetch_texel_2d_f_rgb332,
 262       fetch_texel_3d_f_rgb332
 263    },
 264    {
 265       MESA_FORMAT_A8,
 266       fetch_texel_1d_f_a8,
 267       fetch_texel_2d_f_a8,
 268       fetch_texel_3d_f_a8
 269    },
 270    {
 271       MESA_FORMAT_A16,
 272       fetch_texel_1d_f_a16,
 273       fetch_texel_2d_f_a16,
 274       fetch_texel_3d_f_a16
 275    },
 276    {
 277       MESA_FORMAT_L8,
 278       fetch_texel_1d_f_l8,
 279       fetch_texel_2d_f_l8,
 280       fetch_texel_3d_f_l8
 281    },
 282    {
 283       MESA_FORMAT_L16,
 284       fetch_texel_1d_f_l16,
 285       fetch_texel_2d_f_l16,
 286       fetch_texel_3d_f_l16
 287    },
 288    {
 289       MESA_FORMAT_I8,
 290       fetch_texel_1d_f_i8,
 291       fetch_texel_2d_f_i8,
 292       fetch_texel_3d_f_i8
 293    },
 294    {
 295       MESA_FORMAT_I16,
 296       fetch_texel_1d_f_i16,
 297       fetch_texel_2d_f_i16,
 298       fetch_texel_3d_f_i16
 299    },
 300    {
 301       MESA_FORMAT_YCBCR,
 302       fetch_texel_1d_f_ycbcr,
 303       fetch_texel_2d_f_ycbcr,
 304       fetch_texel_3d_f_ycbcr
 305    },
 306    {
 307       MESA_FORMAT_YCBCR_REV,
 308       fetch_texel_1d_f_ycbcr_rev,
 309       fetch_texel_2d_f_ycbcr_rev,
 310       fetch_texel_3d_f_ycbcr_rev
 311    },
 312    {
 313       MESA_FORMAT_R8,
 314       fetch_texel_1d_f_r8,
 315       fetch_texel_2d_f_r8,
 316       fetch_texel_3d_f_r8
 317    },
 318    {
 319       MESA_FORMAT_GR88,
 320       fetch_texel_1d_f_gr88,
 321       fetch_texel_2d_f_gr88,
 322       fetch_texel_3d_f_gr88
 323    },
 324    {
 325       MESA_FORMAT_RG88,
 326       fetch_texel_1d_f_rg88,
 327       fetch_texel_2d_f_rg88,
 328       fetch_texel_3d_f_rg88
 329    },
 330    {
 331       MESA_FORMAT_R16,
 332       fetch_texel_1d_f_r16,
 333       fetch_texel_2d_f_r16,
 334       fetch_texel_3d_f_r16
 335    },
 336    {
 337       MESA_FORMAT_RG1616,
 338       fetch_texel_1d_f_rg1616,
 339       fetch_texel_2d_f_rg1616,
 340       fetch_texel_3d_f_rg1616
 341    },
 342    {
 343       MESA_FORMAT_RG1616_REV,
 344       fetch_texel_1d_f_rg1616_rev,
 345       fetch_texel_2d_f_rg1616_rev,
 346       fetch_texel_3d_f_rg1616_rev
 347    },
 348    {
 349       MESA_FORMAT_ARGB2101010,
 350       fetch_texel_1d_f_argb2101010,
 351       fetch_texel_2d_f_argb2101010,
 352       fetch_texel_3d_f_argb2101010
 353    },
 354    {
 355       MESA_FORMAT_Z24_S8,
 356       fetch_texel_1d_f_z24_s8,
 357       fetch_texel_2d_f_z24_s8,
 358       fetch_texel_3d_f_z24_s8
 359    },
 360    {
 361       MESA_FORMAT_S8_Z24,
 362       fetch_texel_1d_f_s8_z24,
 363       fetch_texel_2d_f_s8_z24,
 364       fetch_texel_3d_f_s8_z24
 365    },
 366    {
 367       MESA_FORMAT_Z16,
 368       fetch_texel_1d_f_z16,
 369       fetch_texel_2d_f_z16,
 370       fetch_texel_3d_f_z16
 371    },
 372    {
 373       MESA_FORMAT_X8_Z24,
 374       fetch_texel_1d_f_s8_z24,
 375       fetch_texel_2d_f_s8_z24,
 376       fetch_texel_3d_f_s8_z24
 377    },
 378    {
 379       MESA_FORMAT_Z24_X8,
 380       fetch_texel_1d_f_z24_s8,
 381       fetch_texel_2d_f_z24_s8,
 382       fetch_texel_3d_f_z24_s8
 383    },
 384    {
 385       MESA_FORMAT_Z32,
 386       fetch_texel_1d_f_z32,
 387       fetch_texel_2d_f_z32,
 388       fetch_texel_3d_f_z32
 389    },
 390    {
 391       MESA_FORMAT_S8,
 392       NULL,
 393       NULL,
 394       NULL
 395    },
 396    {
 397       MESA_FORMAT_SRGB8,
 398       fetch_texel_1d_srgb8,
 399       fetch_texel_2d_srgb8,
 400       fetch_texel_3d_srgb8
 401    },
 402    {
 403       MESA_FORMAT_SRGBA8,
 404       fetch_texel_1d_srgba8,
 405       fetch_texel_2d_srgba8,
 406       fetch_texel_3d_srgba8
 407    },
 408    {
 409       MESA_FORMAT_SARGB8,
 410       fetch_texel_1d_sargb8,
 411       fetch_texel_2d_sargb8,
 412       fetch_texel_3d_sargb8
 413    },
 414    {
 415       MESA_FORMAT_SL8,
 416       fetch_texel_1d_sl8,
 417       fetch_texel_2d_sl8,
 418       fetch_texel_3d_sl8
 419    },
 420    {
 421       MESA_FORMAT_SLA8,
 422       fetch_texel_1d_sla8,
 423       fetch_texel_2d_sla8,
 424       fetch_texel_3d_sla8
 425    },
 426    {
 427       MESA_FORMAT_SRGB_DXT1,
 428       NULL,
 429       _mesa_fetch_texel_2d_f_srgb_dxt1,
 430       NULL
 431    },
 432    {
 433       MESA_FORMAT_SRGBA_DXT1,
 434       NULL,
 435       _mesa_fetch_texel_2d_f_srgba_dxt1,
 436       NULL
 437    },
 438    {
 439       MESA_FORMAT_SRGBA_DXT3,
 440       NULL,
 441       _mesa_fetch_texel_2d_f_srgba_dxt3,
 442       NULL
 443    },
 444    {
 445       MESA_FORMAT_SRGBA_DXT5,
 446       NULL,
 447       _mesa_fetch_texel_2d_f_srgba_dxt5,
 448       NULL
 449    },
 450
 451    {
 452       MESA_FORMAT_RGB_FXT1,
 453       NULL,
 454       _mesa_fetch_texel_2d_f_rgb_fxt1,
 455       NULL
 456    },
 457    {
 458       MESA_FORMAT_RGBA_FXT1,
 459       NULL,
 460       _mesa_fetch_texel_2d_f_rgba_fxt1,
 461       NULL
 462    },
 463    {
 464       MESA_FORMAT_RGB_DXT1,
 465       NULL,
 466       _mesa_fetch_texel_2d_f_rgb_dxt1,
 467       NULL
 468    },
 469    {
 470       MESA_FORMAT_RGBA_DXT1,
 471       NULL,
 472       _mesa_fetch_texel_2d_f_rgba_dxt1,
 473       NULL
 474    },
 475    {
 476       MESA_FORMAT_RGBA_DXT3,
 477       NULL,
 478       _mesa_fetch_texel_2d_f_rgba_dxt3,
 479       NULL
 480    },
 481    {
 482       MESA_FORMAT_RGBA_DXT5,
 483       NULL,
 484       _mesa_fetch_texel_2d_f_rgba_dxt5,
 485       NULL
 486    },
 487    {
 488       MESA_FORMAT_RGBA_FLOAT32,
 489       fetch_texel_1d_f_rgba_f32,
 490       fetch_texel_2d_f_rgba_f32,
 491       fetch_texel_3d_f_rgba_f32
 492    },
 493    {
 494       MESA_FORMAT_RGBA_FLOAT16,
 495       fetch_texel_1d_f_rgba_f16,
 496       fetch_texel_2d_f_rgba_f16,
 497       fetch_texel_3d_f_rgba_f16
 498    },
 499    {
 500       MESA_FORMAT_RGB_FLOAT32,
 501       fetch_texel_1d_f_rgb_f32,
 502       fetch_texel_2d_f_rgb_f32,
 503       fetch_texel_3d_f_rgb_f32
 504    },
 505    {
 506       MESA_FORMAT_RGB_FLOAT16,
 507       fetch_texel_1d_f_rgb_f16,
 508       fetch_texel_2d_f_rgb_f16,
 509       fetch_texel_3d_f_rgb_f16
 510    },
 511    {
 512       MESA_FORMAT_ALPHA_FLOAT32,
 513       fetch_texel_1d_f_alpha_f32,
 514       fetch_texel_2d_f_alpha_f32,
 515       fetch_texel_3d_f_alpha_f32
 516    },
 517    {
 518       MESA_FORMAT_ALPHA_FLOAT16,
 519       fetch_texel_1d_f_alpha_f16,
 520       fetch_texel_2d_f_alpha_f16,
 521       fetch_texel_3d_f_alpha_f16
 522    },
 523    {
 524       MESA_FORMAT_LUMINANCE_FLOAT32,
 525       fetch_texel_1d_f_luminance_f32,
 526       fetch_texel_2d_f_luminance_f32,
 527       fetch_texel_3d_f_luminance_f32
 528    },
 529    {
 530       MESA_FORMAT_LUMINANCE_FLOAT16,
 531       fetch_texel_1d_f_luminance_f16,
 532       fetch_texel_2d_f_luminance_f16,
 533       fetch_texel_3d_f_luminance_f16
 534    },
 535    {
 536       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32,
 537       fetch_texel_1d_f_luminance_alpha_f32,
 538       fetch_texel_2d_f_luminance_alpha_f32,
 539       fetch_texel_3d_f_luminance_alpha_f32
 540    },
 541    {
 542       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16,
 543       fetch_texel_1d_f_luminance_alpha_f16,
 544       fetch_texel_2d_f_luminance_alpha_f16,
 545       fetch_texel_3d_f_luminance_alpha_f16
 546    },
 547    {
 548       MESA_FORMAT_INTENSITY_FLOAT32,
 549       fetch_texel_1d_f_intensity_f32,
 550       fetch_texel_2d_f_intensity_f32,
 551       fetch_texel_3d_f_intensity_f32
 552    },
 553    {
 554       MESA_FORMAT_INTENSITY_FLOAT16,
 555       fetch_texel_1d_f_intensity_f16,
 556       fetch_texel_2d_f_intensity_f16,
 557       fetch_texel_3d_f_intensity_f16
 558    },
 559    {
 560       MESA_FORMAT_R_FLOAT32,
 561       fetch_texel_1d_f_r_f32,
 562       fetch_texel_2d_f_r_f32,
 563       fetch_texel_3d_f_r_f32
 564    },
 565    {
 566       MESA_FORMAT_R_FLOAT16,
 567       fetch_texel_1d_f_r_f16,
 568       fetch_texel_2d_f_r_f16,
 569       fetch_texel_3d_f_r_f16
 570    },
 571    {
 572       MESA_FORMAT_RG_FLOAT32,
 573       fetch_texel_1d_f_rg_f32,
 574       fetch_texel_2d_f_rg_f32,
 575       fetch_texel_3d_f_rg_f32
 576    },
 577    {
 578       MESA_FORMAT_RG_FLOAT16,
 579       fetch_texel_1d_f_rg_f16,
 580       fetch_texel_2d_f_rg_f16,
 581       fetch_texel_3d_f_rg_f16
 582    },
 583
 584    {
 585       MESA_FORMAT_ALPHA_UINT8,
 586       NULL,
 587       NULL,
 588       NULL
 589    },
 590
 591    {
 592       MESA_FORMAT_ALPHA_UINT16,
 593       NULL,
 594       NULL,
 595       NULL
 596    },
 597
 598    {
 599       MESA_FORMAT_ALPHA_UINT32,
 600       NULL,
 601       NULL,
 602       NULL
 603    },
 604
 605    {
 606       MESA_FORMAT_ALPHA_INT8,
 607       NULL,
 608       NULL,
 609       NULL
 610    },
 611
 612    {
 613       MESA_FORMAT_ALPHA_INT16,
 614       NULL,
 615       NULL,
 616       NULL
 617    },
 618
 619    {
 620       MESA_FORMAT_ALPHA_INT32,
 621       NULL,
 622       NULL,
 623       NULL
 624    },
 625
 626
 627    {
 628       MESA_FORMAT_INTENSITY_UINT8,
 629       NULL,
 630       NULL,
 631       NULL
 632    },
 633
 634    {
 635       MESA_FORMAT_INTENSITY_UINT16,
 636       NULL,
 637       NULL,
 638       NULL
 639    },
 640
 641    {
 642       MESA_FORMAT_INTENSITY_UINT32,
 643       NULL,
 644       NULL,
 645       NULL
 646    },
 647
 648    {
 649       MESA_FORMAT_INTENSITY_INT8,
 650       NULL,
 651       NULL,
 652       NULL
 653    },
 654
 655    {
 656       MESA_FORMAT_INTENSITY_INT16,
 657       NULL,
 658       NULL,
 659       NULL
 660    },
 661
 662    {
 663       MESA_FORMAT_INTENSITY_INT32,
 664       NULL,
 665       NULL,
 666       NULL
 667    },
 668
 669
 670    {
 671       MESA_FORMAT_LUMINANCE_UINT8,
 672       NULL,
 673       NULL,
 674       NULL
 675    },
 676
 677    {
 678       MESA_FORMAT_LUMINANCE_UINT16,
 679       NULL,
 680       NULL,
 681       NULL
 682    },
 683
 684    {
 685       MESA_FORMAT_LUMINANCE_UINT32,
 686       NULL,
 687       NULL,
 688       NULL
 689    },
 690
 691    {
 692       MESA_FORMAT_LUMINANCE_INT8,
 693       NULL,
 694       NULL,
 695       NULL
 696    },
 697
 698    {
 699       MESA_FORMAT_LUMINANCE_INT16,
 700       NULL,
 701       NULL,
 702       NULL
 703    },
 704
 705    {
 706       MESA_FORMAT_LUMINANCE_INT32,
 707       NULL,
 708       NULL,
 709       NULL
 710    },
 711
 712
 713    {
 714       MESA_FORMAT_LUMINANCE_ALPHA_UINT8,
 715       NULL,
 716       NULL,
 717       NULL
 718    },
 719
 720    {
 721       MESA_FORMAT_LUMINANCE_ALPHA_UINT16,
 722       NULL,
 723       NULL,
 724       NULL
 725    },
 726
 727    {
 728       MESA_FORMAT_LUMINANCE_ALPHA_UINT32,
 729       NULL,
 730       NULL,
 731       NULL
 732    },
 733
 734    {
 735       MESA_FORMAT_LUMINANCE_ALPHA_INT8,
 736       NULL,
 737       NULL,
 738       NULL
 739    },
 740
 741    {
 742       MESA_FORMAT_LUMINANCE_ALPHA_INT16,
 743       NULL,
 744       NULL,
 745       NULL
 746    },
 747
 748    {
 749       MESA_FORMAT_LUMINANCE_ALPHA_INT32,
 750       NULL,
 751       NULL,
 752       NULL
 753    },
 754
 755
 756    {
 757       MESA_FORMAT_R_INT8,
 758       NULL,
 759       NULL,
 760       NULL
 761    },
 762
 763    {
 764       MESA_FORMAT_RG_INT8,
 765       NULL,
 766       NULL,
 767       NULL
 768    },
 769
 770    {
 771       MESA_FORMAT_RGB_INT8,
 772       NULL,
 773       NULL,
 774       NULL
 775    },
 776
 777    /* non-normalized, signed int */
 778    {
 779       MESA_FORMAT_RGBA_INT8,
 780       fetch_texel_1d_rgba_int8,
 781       fetch_texel_2d_rgba_int8,
 782       fetch_texel_3d_rgba_int8
 783    },
 784    {
 785       MESA_FORMAT_R_INT16,
 786       NULL,
 787       NULL,
 788       NULL
 789    },
 790    {
 791       MESA_FORMAT_RG_INT16,
 792       NULL,
 793       NULL,
 794       NULL
 795    },
 796    {
 797       MESA_FORMAT_RGB_INT16,
 798       NULL,
 799       NULL,
 800       NULL
 801    },
 802    {
 803       MESA_FORMAT_RGBA_INT16,
 804       fetch_texel_1d_rgba_int16,
 805       fetch_texel_2d_rgba_int16,
 806       fetch_texel_3d_rgba_int16
 807    },
 808    {
 809       MESA_FORMAT_R_INT32,
 810       NULL,
 811       NULL,
 812       NULL
 813    },
 814    {
 815       MESA_FORMAT_RG_INT32,
 816       NULL,
 817       NULL,
 818       NULL
 819    },
 820    {
 821       MESA_FORMAT_RGB_INT32,
 822       NULL,
 823       NULL,
 824       NULL
 825    },
 826    {
 827       MESA_FORMAT_RGBA_INT32,
 828       fetch_texel_1d_rgba_int32,
 829       fetch_texel_2d_rgba_int32,
 830       fetch_texel_3d_rgba_int32
 831    },
 832
 833    /* non-normalized, unsigned int */
 834    {
 835       MESA_FORMAT_R_UINT8,
 836       NULL,
 837       NULL,
 838       NULL
 839    },
 840    {
 841       MESA_FORMAT_RG_UINT8,
 842       NULL,
 843       NULL,
 844       NULL
 845    },
 846    {
 847       MESA_FORMAT_RGB_UINT8,
 848       NULL,
 849       NULL,
 850       NULL
 851    },
 852    {
 853       MESA_FORMAT_RGBA_UINT8,
 854       fetch_texel_1d_rgba_uint8,
 855       fetch_texel_2d_rgba_uint8,
 856       fetch_texel_3d_rgba_uint8
 857    },
 858    {
 859       MESA_FORMAT_R_UINT16,
 860       NULL,
 861       NULL,
 862       NULL
 863    },
 864    {
 865       MESA_FORMAT_RG_UINT16,
 866       NULL,
 867       NULL,
 868       NULL
 869    },
 870    {
 871       MESA_FORMAT_RGB_UINT16,
 872       NULL,
 873       NULL,
 874       NULL
 875    },
 876    {
 877       MESA_FORMAT_RGBA_UINT16,
 878       fetch_texel_1d_rgba_uint16,
 879       fetch_texel_2d_rgba_uint16,
 880       fetch_texel_3d_rgba_uint16
 881    },
 882    {
 883       MESA_FORMAT_R_UINT32,
 884       NULL,
 885       NULL,
 886       NULL
 887    },
 888    {
 889       MESA_FORMAT_RG_UINT32,
 890       NULL,
 891       NULL,
 892       NULL
 893    },
 894    {
 895       MESA_FORMAT_RGB_UINT32,
 896       NULL,
 897       NULL,
 898       NULL
 899    },
 900    {
 901       MESA_FORMAT_RGBA_UINT32,
 902       fetch_texel_1d_rgba_uint32,
 903       fetch_texel_2d_rgba_uint32,
 904       fetch_texel_3d_rgba_uint32
 905    },
 906
 907    /* dudv */
 908    {
 909       MESA_FORMAT_DUDV8,
 910       fetch_texel_1d_dudv8,
 911       fetch_texel_2d_dudv8,
 912       fetch_texel_3d_dudv8
 913    },
 914
 915    /* signed, normalized */
 916    {
 917       MESA_FORMAT_SIGNED_R8,
 918       fetch_texel_1d_signed_r8,
 919       fetch_texel_2d_signed_r8,
 920       fetch_texel_3d_signed_r8
 921    },
 922    {
 923       MESA_FORMAT_SIGNED_RG88_REV,
 924       fetch_texel_1d_signed_rg88_rev,
 925       fetch_texel_2d_signed_rg88_rev,
 926       fetch_texel_3d_signed_rg88_rev
 927    },
 928    {
 929       MESA_FORMAT_SIGNED_RGBX8888,
 930       fetch_texel_1d_signed_rgbx8888,
 931       fetch_texel_2d_signed_rgbx8888,
 932       fetch_texel_3d_signed_rgbx8888
 933    },
 934    {
 935       MESA_FORMAT_SIGNED_RGBA8888,
 936       fetch_texel_1d_signed_rgba8888,
 937       fetch_texel_2d_signed_rgba8888,
 938       fetch_texel_3d_signed_rgba8888
 939    },
 940    {
 941       MESA_FORMAT_SIGNED_RGBA8888_REV,
 942       fetch_texel_1d_signed_rgba8888_rev,
 943       fetch_texel_2d_signed_rgba8888_rev,
 944       fetch_texel_3d_signed_rgba8888_rev
 945    },
 946    {
 947       MESA_FORMAT_SIGNED_R16,
 948       fetch_texel_1d_signed_r16,
 949       fetch_texel_2d_signed_r16,
 950       fetch_texel_3d_signed_r16
 951    },
 952    {
 953       MESA_FORMAT_SIGNED_GR1616,
 954       fetch_texel_1d_signed_rg1616,
 955       fetch_texel_2d_signed_rg1616,
 956       fetch_texel_3d_signed_rg1616
 957    },
 958    {
 959       MESA_FORMAT_SIGNED_RGB_16,
 960       fetch_texel_1d_signed_rgb_16,
 961       fetch_texel_2d_signed_rgb_16,
 962       fetch_texel_3d_signed_rgb_16
 963    },
 964    {
 965       MESA_FORMAT_SIGNED_RGBA_16,
 966       fetch_texel_1d_signed_rgba_16,
 967       fetch_texel_2d_signed_rgba_16,
 968       fetch_texel_3d_signed_rgba_16
 969    },
 970    {
 971       MESA_FORMAT_RGBA_16,
 972       fetch_texel_1d_rgba_16,
 973       fetch_texel_2d_rgba_16,
 974       fetch_texel_3d_rgba_16
 975    },
 976    {
 977       MESA_FORMAT_RED_RGTC1,
 978       NULL,
 979       _mesa_fetch_texel_2d_f_red_rgtc1,
 980       NULL
 981    },
 982    {
 983       MESA_FORMAT_SIGNED_RED_RGTC1,
 984       NULL,
 985       _mesa_fetch_texel_2d_f_signed_red_rgtc1,
 986       NULL
 987    },
 988    {
 989       MESA_FORMAT_RG_RGTC2,
 990       NULL,
 991       _mesa_fetch_texel_2d_f_rg_rgtc2,
 992       NULL
 993    },
 994    {
 995       MESA_FORMAT_SIGNED_RG_RGTC2,
 996       NULL,
 997       _mesa_fetch_texel_2d_f_signed_rg_rgtc2,
 998       NULL
 999    },
1000    {
1001       MESA_FORMAT_L_LATC1,
1002       NULL,
1003       _mesa_fetch_texel_2d_f_l_latc1,
1004       NULL
1005    },
1006    {
1007       MESA_FORMAT_SIGNED_L_LATC1,
1008       NULL,
1009       _mesa_fetch_texel_2d_f_signed_l_latc1,
1010       NULL
1011    },
1012    {
1013       MESA_FORMAT_LA_LATC2,
1014       NULL,
1015       _mesa_fetch_texel_2d_f_la_latc2,
1016       NULL
1017    },
1018    {
1019       MESA_FORMAT_SIGNED_LA_LATC2,
1020       NULL,
1021       _mesa_fetch_texel_2d_f_signed_la_latc2,
1022       NULL
1023    },
1024    {
1025       MESA_FORMAT_ETC1_RGB8,
1026       NULL,
1027       _mesa_fetch_texel_2d_f_etc1_rgb8,
1028       NULL
1029    },
1030    {
1031       MESA_FORMAT_SIGNED_A8,
1032       fetch_texel_1d_signed_a8,
1033       fetch_texel_2d_signed_a8,
1034       fetch_texel_3d_signed_a8
1035    },
1036    {
1037       MESA_FORMAT_SIGNED_L8,
1038       fetch_texel_1d_signed_l8,
1039       fetch_texel_2d_signed_l8,
1040       fetch_texel_3d_signed_l8
1041    },
1042    {
1043       MESA_FORMAT_SIGNED_AL88,
1044       fetch_texel_1d_signed_al88,
1045       fetch_texel_2d_signed_al88,
1046       fetch_texel_3d_signed_al88
1047    },
1048    {
1049       MESA_FORMAT_SIGNED_I8,
1050       fetch_texel_1d_signed_i8,
1051       fetch_texel_2d_signed_i8,
1052       fetch_texel_3d_signed_i8
1053    },
1054    {
1055       MESA_FORMAT_SIGNED_A16,
1056       fetch_texel_1d_signed_a16,
1057       fetch_texel_2d_signed_a16,
1058       fetch_texel_3d_signed_a16
1059    },
1060    {
1061       MESA_FORMAT_SIGNED_L16,
1062       fetch_texel_1d_signed_l16,
1063       fetch_texel_2d_signed_l16,
1064       fetch_texel_3d_signed_l16
1065    },
1066    {
1067       MESA_FORMAT_SIGNED_AL1616,
1068       fetch_texel_1d_signed_al1616,
1069       fetch_texel_2d_signed_al1616,
1070       fetch_texel_3d_signed_al1616
1071    },
1072    {
1073       MESA_FORMAT_SIGNED_I16,
1074       fetch_texel_1d_signed_i16,
1075       fetch_texel_2d_signed_i16,
1076       fetch_texel_3d_signed_i16
1077    },
1078    {
1079       MESA_FORMAT_RGB9_E5_FLOAT,
1080       fetch_texel_1d_rgb9_e5,
1081       fetch_texel_2d_rgb9_e5,
1082       fetch_texel_3d_rgb9_e5
1083    },
1084    {
1085       MESA_FORMAT_R11_G11_B10_FLOAT,
1086       fetch_texel_1d_r11_g11_b10f,
1087       fetch_texel_2d_r11_g11_b10f,
1088       fetch_texel_3d_r11_g11_b10f
1089    },
1090    {
1091       MESA_FORMAT_Z32_FLOAT,
1092       fetch_texel_1d_f_r_f32, /* Reuse the R32F functions. */
1093       fetch_texel_2d_f_r_f32,
1094       fetch_texel_3d_f_r_f32
1095    },
1096    {
1097       MESA_FORMAT_Z32_FLOAT_X24S8,
1098       fetch_texel_1d_z32f_x24s8,
1099       fetch_texel_2d_z32f_x24s8,
1100       fetch_texel_3d_z32f_x24s8
1101    },
1102    {
1103       MESA_FORMAT_ARGB2101010_UINT,
1104       NULL,
1105       NULL,
1106       NULL
1107    }
1108 };
1109
1110
1111 FetchTexelFunc
1112 _mesa_get_texel_fetch_func(gl_format format, GLuint dims)
1113 {
1114 #ifdef DEBUG
1115    /* check that the table entries are sorted by format name */
1116    gl_format fmt;
1117    for (fmt = 0; fmt < MESA_FORMAT_COUNT; fmt++) {
1118       assert(texfetch_funcs[fmt].Name == fmt);
1119    }
1120 #endif
1121
1122    STATIC_ASSERT(Elements(texfetch_funcs) == MESA_FORMAT_COUNT);
1123
1124    assert(format < MESA_FORMAT_COUNT);
1125
1126    switch (dims) {
1127    case 1:
1128       return texfetch_funcs[format].Fetch1D;
1129    case 2:
1130       return texfetch_funcs[format].Fetch2D;
1131    case 3:
1132       return texfetch_funcs[format].Fetch3D;
1133    default:
1134       assert(0 && "bad dims in _mesa_get_texel_fetch_func");
1135       return NULL;
1136    }
1137 }
1138
1139
1140 /**
1141  * Initialize the texture image's FetchTexel methods.
1142  */
1143 static void
1144 set_fetch_functions(struct swrast_texture_image *texImage, GLuint dims)
1145 {
1146    gl_format format = texImage->Base.TexFormat;
1147
1148    ASSERT(dims == 1 || dims == 2 || dims == 3);
1149
1150    if (texImage->Base.TexObject->Sampler.sRGBDecode == GL_SKIP_DECODE_EXT &&
1151        _mesa_get_format_color_encoding(format) == GL_SRGB) {
1152       format = _mesa_get_srgb_format_linear(format);
1153    }
1154
1155    texImage->FetchTexel = _mesa_get_texel_fetch_func(format, dims);
1156    ASSERT(texImage->FetchTexel);
1157 }
1158
1159 void
1160 _mesa_update_fetch_functions(struct gl_texture_object *texObj)
1161 {
1162    GLuint face, i;
1163    GLuint dims;
1164
1165    dims = _mesa_get_texture_dimensions(texObj->Target);
1166
1167    for (face = 0; face < 6; face++) {
1168       for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
1169          if (texObj->Image[face][i]) {
1170             set_fetch_functions(swrast_texture_image(texObj->Image[face][i]),
1171                                 dims);
1172          }
1173       }
1174    }
1175 }