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/teximage.h"
  43 #include "s_context.h"
  44 #include "s_texfetch.h"
  45 #include "../../gallium/auxiliary/util/u_format_rgb9e5.h"
  46 #include "../../gallium/auxiliary/util/u_format_r11g11b10f.h"
  47
  48
  49 /**
  50  * Convert an 8-bit sRGB value from non-linear space to a
  51  * linear RGB value in [0, 1].
  52  * Implemented with a 256-entry lookup table.
  53  */
  54 static inline GLfloat
  55 nonlinear_to_linear(GLubyte cs8)
  56 {
  57    static GLfloat table[256];
  58    static GLboolean tableReady = GL_FALSE;
  59    if (!tableReady) {
  60       /* compute lookup table now */
  61       GLuint i;
  62       for (i = 0; i < 256; i++) {
  63          const GLfloat cs = UBYTE_TO_FLOAT(i);
  64          if (cs <= 0.04045) {
  65             table[i] = cs / 12.92f;
  66          }
  67          else {
  68             table[i] = (GLfloat) pow((cs + 0.055) / 1.055, 2.4);
  69          }
  70       }
  71       tableReady = GL_TRUE;
  72    }
  73    return table[cs8];
  74 }
  75
  76
  77
  78 /* Texel fetch routines for all supported formats
  79  */
  80 #define DIM 1
  81 #include "s_texfetch_tmp.h"
  82
  83 #define DIM 2
  84 #include "s_texfetch_tmp.h"
  85
  86 #define DIM 3
  87 #include "s_texfetch_tmp.h"
  88
  89 /**
  90  * Null texel fetch function.
  91  *
  92  * Have to have this so the FetchTexel function pointer is never NULL.
  93  */
  94 static void fetch_null_texelf( const struct swrast_texture_image *texImage,
  95                                GLint i, GLint j, GLint k, GLfloat *texel )
  96 {
  97    (void) texImage; (void) i; (void) j; (void) k;
  98    texel[RCOMP] = 0.0;
  99    texel[GCOMP] = 0.0;
 100    texel[BCOMP] = 0.0;
 101    texel[ACOMP] = 0.0;
 102    _mesa_warning(NULL, "fetch_null_texelf() called!");
 103 }
 104
 105 static void store_null_texel(struct swrast_texture_image *texImage,
 106                              GLint i, GLint j, GLint k, const void *texel)
 107 {
 108    (void) texImage;
 109    (void) i;
 110    (void) j;
 111    (void) k;
 112    (void) texel;
 113    /* no-op */
 114 }
 115
 116
 117
 118 /**
 119  * Table to map MESA_FORMAT_ to texel fetch/store funcs.
 120  * XXX this is somewhat temporary.
 121  */
 122 static struct {
 123    gl_format Name;
 124    FetchTexelFunc Fetch1D;
 125    FetchTexelFunc Fetch2D;
 126    FetchTexelFunc Fetch3D;
 127    StoreTexelFunc StoreTexel;
 128 }
 129 texfetch_funcs[MESA_FORMAT_COUNT] =
 130 {
 131    {
 132       MESA_FORMAT_NONE,
 133       fetch_null_texelf,
 134       fetch_null_texelf,
 135       fetch_null_texelf,
 136       store_null_texel
 137    },
 138
 139    {
 140       MESA_FORMAT_RGBA8888,
 141       fetch_texel_1d_f_rgba8888,
 142       fetch_texel_2d_f_rgba8888,
 143       fetch_texel_3d_f_rgba8888,
 144       store_texel_rgba8888
 145    },
 146    {
 147       MESA_FORMAT_RGBA8888_REV,
 148       fetch_texel_1d_f_rgba8888_rev,
 149       fetch_texel_2d_f_rgba8888_rev,
 150       fetch_texel_3d_f_rgba8888_rev,
 151       store_texel_rgba8888_rev
 152    },
 153    {
 154       MESA_FORMAT_ARGB8888,
 155       fetch_texel_1d_f_argb8888,
 156       fetch_texel_2d_f_argb8888,
 157       fetch_texel_3d_f_argb8888,
 158       store_texel_argb8888
 159    },
 160    {
 161       MESA_FORMAT_ARGB8888_REV,
 162       fetch_texel_1d_f_argb8888_rev,
 163       fetch_texel_2d_f_argb8888_rev,
 164       fetch_texel_3d_f_argb8888_rev,
 165       store_texel_argb8888_rev
 166    },
 167    {
 168       MESA_FORMAT_RGBX8888,
 169       fetch_texel_1d_f_rgbx8888,
 170       fetch_texel_2d_f_rgbx8888,
 171       fetch_texel_3d_f_rgbx8888,
 172       store_texel_rgbx8888
 173    },
 174    {
 175       MESA_FORMAT_RGBX8888_REV,
 176       fetch_texel_1d_f_rgbx8888_rev,
 177       fetch_texel_2d_f_rgbx8888_rev,
 178       fetch_texel_3d_f_rgbx8888_rev,
 179       store_texel_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       store_texel_xrgb8888
 187    },
 188    {
 189       MESA_FORMAT_XRGB8888_REV,
 190       fetch_texel_1d_f_xrgb8888_rev,
 191       fetch_texel_2d_f_xrgb8888_rev,
 192       fetch_texel_3d_f_xrgb8888_rev,
 193       store_texel_xrgb8888_rev,
 194    },
 195    {
 196       MESA_FORMAT_RGB888,
 197       fetch_texel_1d_f_rgb888,
 198       fetch_texel_2d_f_rgb888,
 199       fetch_texel_3d_f_rgb888,
 200       store_texel_rgb888
 201    },
 202    {
 203       MESA_FORMAT_BGR888,
 204       fetch_texel_1d_f_bgr888,
 205       fetch_texel_2d_f_bgr888,
 206       fetch_texel_3d_f_bgr888,
 207       store_texel_bgr888
 208    },
 209    {
 210       MESA_FORMAT_RGB565,
 211       fetch_texel_1d_f_rgb565,
 212       fetch_texel_2d_f_rgb565,
 213       fetch_texel_3d_f_rgb565,
 214       store_texel_rgb565
 215    },
 216    {
 217       MESA_FORMAT_RGB565_REV,
 218       fetch_texel_1d_f_rgb565_rev,
 219       fetch_texel_2d_f_rgb565_rev,
 220       fetch_texel_3d_f_rgb565_rev,
 221       store_texel_rgb565_rev
 222    },
 223    {
 224       MESA_FORMAT_ARGB4444,
 225       fetch_texel_1d_f_argb4444,
 226       fetch_texel_2d_f_argb4444,
 227       fetch_texel_3d_f_argb4444,
 228       store_texel_argb4444
 229    },
 230    {
 231       MESA_FORMAT_ARGB4444_REV,
 232       fetch_texel_1d_f_argb4444_rev,
 233       fetch_texel_2d_f_argb4444_rev,
 234       fetch_texel_3d_f_argb4444_rev,
 235       store_texel_argb4444_rev
 236    },
 237    {
 238       MESA_FORMAT_RGBA5551,
 239       fetch_texel_1d_f_rgba5551,
 240       fetch_texel_2d_f_rgba5551,
 241       fetch_texel_3d_f_rgba5551,
 242       store_texel_rgba5551
 243    },
 244    {
 245       MESA_FORMAT_ARGB1555,
 246       fetch_texel_1d_f_argb1555,
 247       fetch_texel_2d_f_argb1555,
 248       fetch_texel_3d_f_argb1555,
 249       store_texel_argb1555
 250    },
 251    {
 252       MESA_FORMAT_ARGB1555_REV,
 253       fetch_texel_1d_f_argb1555_rev,
 254       fetch_texel_2d_f_argb1555_rev,
 255       fetch_texel_3d_f_argb1555_rev,
 256       store_texel_argb1555_rev
 257    },
 258    {
 259       MESA_FORMAT_AL44,
 260       fetch_texel_1d_f_al44,
 261       fetch_texel_2d_f_al44,
 262       fetch_texel_3d_f_al44,
 263       store_texel_al44
 264    },
 265    {
 266       MESA_FORMAT_AL88,
 267       fetch_texel_1d_f_al88,
 268       fetch_texel_2d_f_al88,
 269       fetch_texel_3d_f_al88,
 270       store_texel_al88
 271    },
 272    {
 273       MESA_FORMAT_AL88_REV,
 274       fetch_texel_1d_f_al88_rev,
 275       fetch_texel_2d_f_al88_rev,
 276       fetch_texel_3d_f_al88_rev,
 277       store_texel_al88_rev
 278    },
 279    {
 280       MESA_FORMAT_AL1616,
 281       fetch_texel_1d_f_al1616,
 282       fetch_texel_2d_f_al1616,
 283       fetch_texel_3d_f_al1616,
 284       store_texel_al1616
 285    },
 286    {
 287       MESA_FORMAT_AL1616_REV,
 288       fetch_texel_1d_f_al1616_rev,
 289       fetch_texel_2d_f_al1616_rev,
 290       fetch_texel_3d_f_al1616_rev,
 291       store_texel_al1616_rev
 292    },
 293    {
 294       MESA_FORMAT_RGB332,
 295       fetch_texel_1d_f_rgb332,
 296       fetch_texel_2d_f_rgb332,
 297       fetch_texel_3d_f_rgb332,
 298       store_texel_rgb332
 299    },
 300    {
 301       MESA_FORMAT_A8,
 302       fetch_texel_1d_f_a8,
 303       fetch_texel_2d_f_a8,
 304       fetch_texel_3d_f_a8,
 305       store_texel_a8
 306    },
 307    {
 308       MESA_FORMAT_A16,
 309       fetch_texel_1d_f_a16,
 310       fetch_texel_2d_f_a16,
 311       fetch_texel_3d_f_a16,
 312       store_texel_a16
 313    },
 314    {
 315       MESA_FORMAT_L8,
 316       fetch_texel_1d_f_l8,
 317       fetch_texel_2d_f_l8,
 318       fetch_texel_3d_f_l8,
 319       store_texel_l8
 320    },
 321    {
 322       MESA_FORMAT_L16,
 323       fetch_texel_1d_f_l16,
 324       fetch_texel_2d_f_l16,
 325       fetch_texel_3d_f_l16,
 326       store_texel_l16
 327    },
 328    {
 329       MESA_FORMAT_I8,
 330       fetch_texel_1d_f_i8,
 331       fetch_texel_2d_f_i8,
 332       fetch_texel_3d_f_i8,
 333       store_texel_i8
 334    },
 335    {
 336       MESA_FORMAT_I16,
 337       fetch_texel_1d_f_i16,
 338       fetch_texel_2d_f_i16,
 339       fetch_texel_3d_f_i16,
 340       store_texel_i16
 341    },
 342    {
 343       MESA_FORMAT_YCBCR,
 344       fetch_texel_1d_f_ycbcr,
 345       fetch_texel_2d_f_ycbcr,
 346       fetch_texel_3d_f_ycbcr,
 347       store_texel_ycbcr
 348    },
 349    {
 350       MESA_FORMAT_YCBCR_REV,
 351       fetch_texel_1d_f_ycbcr_rev,
 352       fetch_texel_2d_f_ycbcr_rev,
 353       fetch_texel_3d_f_ycbcr_rev,
 354       store_texel_ycbcr_rev
 355    },
 356    {
 357       MESA_FORMAT_R8,
 358       fetch_texel_1d_f_r8,
 359       fetch_texel_2d_f_r8,
 360       fetch_texel_3d_f_r8,
 361       store_texel_r8,
 362    },
 363    {
 364       MESA_FORMAT_RG88,
 365       fetch_texel_1d_f_rg88,
 366       fetch_texel_2d_f_rg88,
 367       fetch_texel_3d_f_rg88,
 368       store_texel_rg88,
 369    },
 370    {
 371       MESA_FORMAT_RG88_REV,
 372       fetch_texel_1d_f_rg88_rev,
 373       fetch_texel_2d_f_rg88_rev,
 374       fetch_texel_3d_f_rg88_rev,
 375       store_texel_rg88_rev,
 376    },
 377    {
 378       MESA_FORMAT_R16,
 379       fetch_texel_1d_f_r16,
 380       fetch_texel_2d_f_r16,
 381       fetch_texel_3d_f_r16,
 382       store_texel_r16,
 383    },
 384    {
 385       MESA_FORMAT_RG1616,
 386       fetch_texel_1d_f_rg1616,
 387       fetch_texel_2d_f_rg1616,
 388       fetch_texel_3d_f_rg1616,
 389       store_texel_rg1616,
 390    },
 391    {
 392       MESA_FORMAT_RG1616_REV,
 393       fetch_texel_1d_f_rg1616_rev,
 394       fetch_texel_2d_f_rg1616_rev,
 395       fetch_texel_3d_f_rg1616_rev,
 396       store_texel_rg1616_rev,
 397    },
 398    {
 399       MESA_FORMAT_ARGB2101010,
 400       fetch_texel_1d_f_argb2101010,
 401       fetch_texel_2d_f_argb2101010,
 402       fetch_texel_3d_f_argb2101010,
 403       store_texel_argb2101010
 404    },
 405    {
 406       MESA_FORMAT_Z24_S8,
 407       fetch_texel_1d_f_z24_s8,
 408       fetch_texel_2d_f_z24_s8,
 409       fetch_texel_3d_f_z24_s8,
 410       store_texel_z24_s8
 411    },
 412    {
 413       MESA_FORMAT_S8_Z24,
 414       fetch_texel_1d_f_s8_z24,
 415       fetch_texel_2d_f_s8_z24,
 416       fetch_texel_3d_f_s8_z24,
 417       store_texel_s8_z24
 418    },
 419    {
 420       MESA_FORMAT_Z16,
 421       fetch_texel_1d_f_z16,
 422       fetch_texel_2d_f_z16,
 423       fetch_texel_3d_f_z16,
 424       store_texel_z16
 425    },
 426    {
 427       MESA_FORMAT_X8_Z24,
 428       fetch_texel_1d_f_s8_z24,
 429       fetch_texel_2d_f_s8_z24,
 430       fetch_texel_3d_f_s8_z24,
 431       store_texel_s8_z24
 432    },
 433    {
 434       MESA_FORMAT_Z24_X8,
 435       fetch_texel_1d_f_z24_s8,
 436       fetch_texel_2d_f_z24_s8,
 437       fetch_texel_3d_f_z24_s8,
 438       store_texel_z24_s8
 439    },
 440    {
 441       MESA_FORMAT_Z32,
 442       fetch_texel_1d_f_z32,
 443       fetch_texel_2d_f_z32,
 444       fetch_texel_3d_f_z32,
 445       store_texel_z32
 446    },
 447    {
 448       MESA_FORMAT_S8,
 449       NULL,
 450       NULL,
 451       NULL,
 452       NULL
 453    },
 454    {
 455       MESA_FORMAT_SRGB8,
 456       fetch_texel_1d_srgb8,
 457       fetch_texel_2d_srgb8,
 458       fetch_texel_3d_srgb8,
 459       store_texel_srgb8
 460    },
 461    {
 462       MESA_FORMAT_SRGBA8,
 463       fetch_texel_1d_srgba8,
 464       fetch_texel_2d_srgba8,
 465       fetch_texel_3d_srgba8,
 466       store_texel_srgba8
 467    },
 468    {
 469       MESA_FORMAT_SARGB8,
 470       fetch_texel_1d_sargb8,
 471       fetch_texel_2d_sargb8,
 472       fetch_texel_3d_sargb8,
 473       store_texel_sargb8
 474    },
 475    {
 476       MESA_FORMAT_SL8,
 477       fetch_texel_1d_sl8,
 478       fetch_texel_2d_sl8,
 479       fetch_texel_3d_sl8,
 480       store_texel_sl8
 481    },
 482    {
 483       MESA_FORMAT_SLA8,
 484       fetch_texel_1d_sla8,
 485       fetch_texel_2d_sla8,
 486       fetch_texel_3d_sla8,
 487       store_texel_sla8
 488    },
 489    {
 490       MESA_FORMAT_SRGB_DXT1,
 491       NULL,
 492       _mesa_fetch_texel_2d_f_srgb_dxt1,
 493       NULL,
 494       NULL
 495    },
 496    {
 497       MESA_FORMAT_SRGBA_DXT1,
 498       NULL,
 499       _mesa_fetch_texel_2d_f_srgba_dxt1,
 500       NULL,
 501       NULL
 502    },
 503    {
 504       MESA_FORMAT_SRGBA_DXT3,
 505       NULL,
 506       _mesa_fetch_texel_2d_f_srgba_dxt3,
 507       NULL,
 508       NULL
 509    },
 510    {
 511       MESA_FORMAT_SRGBA_DXT5,
 512       NULL,
 513       _mesa_fetch_texel_2d_f_srgba_dxt5,
 514       NULL,
 515       NULL
 516    },
 517
 518    {
 519       MESA_FORMAT_RGB_FXT1,
 520       NULL,
 521       _mesa_fetch_texel_2d_f_rgb_fxt1,
 522       NULL,
 523       NULL
 524    },
 525    {
 526       MESA_FORMAT_RGBA_FXT1,
 527       NULL,
 528       _mesa_fetch_texel_2d_f_rgba_fxt1,
 529       NULL,
 530       NULL
 531    },
 532    {
 533       MESA_FORMAT_RGB_DXT1,
 534       NULL,
 535       _mesa_fetch_texel_2d_f_rgb_dxt1,
 536       NULL,
 537       NULL
 538    },
 539    {
 540       MESA_FORMAT_RGBA_DXT1,
 541       NULL,
 542       _mesa_fetch_texel_2d_f_rgba_dxt1,
 543       NULL,
 544       NULL
 545    },
 546    {
 547       MESA_FORMAT_RGBA_DXT3,
 548       NULL,
 549       _mesa_fetch_texel_2d_f_rgba_dxt3,
 550       NULL,
 551       NULL
 552    },
 553    {
 554       MESA_FORMAT_RGBA_DXT5,
 555       NULL,
 556       _mesa_fetch_texel_2d_f_rgba_dxt5,
 557       NULL,
 558       NULL
 559    },
 560    {
 561       MESA_FORMAT_RGBA_FLOAT32,
 562       fetch_texel_1d_f_rgba_f32,
 563       fetch_texel_2d_f_rgba_f32,
 564       fetch_texel_3d_f_rgba_f32,
 565       store_texel_rgba_f32
 566    },
 567    {
 568       MESA_FORMAT_RGBA_FLOAT16,
 569       fetch_texel_1d_f_rgba_f16,
 570       fetch_texel_2d_f_rgba_f16,
 571       fetch_texel_3d_f_rgba_f16,
 572       store_texel_rgba_f16
 573    },
 574    {
 575       MESA_FORMAT_RGB_FLOAT32,
 576       fetch_texel_1d_f_rgb_f32,
 577       fetch_texel_2d_f_rgb_f32,
 578       fetch_texel_3d_f_rgb_f32,
 579       store_texel_rgb_f32
 580    },
 581    {
 582       MESA_FORMAT_RGB_FLOAT16,
 583       fetch_texel_1d_f_rgb_f16,
 584       fetch_texel_2d_f_rgb_f16,
 585       fetch_texel_3d_f_rgb_f16,
 586       store_texel_rgb_f16
 587    },
 588    {
 589       MESA_FORMAT_ALPHA_FLOAT32,
 590       fetch_texel_1d_f_alpha_f32,
 591       fetch_texel_2d_f_alpha_f32,
 592       fetch_texel_3d_f_alpha_f32,
 593       store_texel_alpha_f32
 594    },
 595    {
 596       MESA_FORMAT_ALPHA_FLOAT16,
 597       fetch_texel_1d_f_alpha_f16,
 598       fetch_texel_2d_f_alpha_f16,
 599       fetch_texel_3d_f_alpha_f16,
 600       store_texel_alpha_f16
 601    },
 602    {
 603       MESA_FORMAT_LUMINANCE_FLOAT32,
 604       fetch_texel_1d_f_luminance_f32,
 605       fetch_texel_2d_f_luminance_f32,
 606       fetch_texel_3d_f_luminance_f32,
 607       store_texel_luminance_f32
 608    },
 609    {
 610       MESA_FORMAT_LUMINANCE_FLOAT16,
 611       fetch_texel_1d_f_luminance_f16,
 612       fetch_texel_2d_f_luminance_f16,
 613       fetch_texel_3d_f_luminance_f16,
 614       store_texel_luminance_f16
 615    },
 616    {
 617       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32,
 618       fetch_texel_1d_f_luminance_alpha_f32,
 619       fetch_texel_2d_f_luminance_alpha_f32,
 620       fetch_texel_3d_f_luminance_alpha_f32,
 621       store_texel_luminance_alpha_f32
 622    },
 623    {
 624       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16,
 625       fetch_texel_1d_f_luminance_alpha_f16,
 626       fetch_texel_2d_f_luminance_alpha_f16,
 627       fetch_texel_3d_f_luminance_alpha_f16,
 628       store_texel_luminance_alpha_f16
 629    },
 630    {
 631       MESA_FORMAT_INTENSITY_FLOAT32,
 632       fetch_texel_1d_f_intensity_f32,
 633       fetch_texel_2d_f_intensity_f32,
 634       fetch_texel_3d_f_intensity_f32,
 635       store_texel_intensity_f32
 636    },
 637    {
 638       MESA_FORMAT_INTENSITY_FLOAT16,
 639       fetch_texel_1d_f_intensity_f16,
 640       fetch_texel_2d_f_intensity_f16,
 641       fetch_texel_3d_f_intensity_f16,
 642       store_texel_intensity_f16
 643    },
 644    {
 645       MESA_FORMAT_R_FLOAT32,
 646       fetch_texel_1d_f_r_f32,
 647       fetch_texel_2d_f_r_f32,
 648       fetch_texel_3d_f_r_f32,
 649       store_texel_r_f32
 650    },
 651    {
 652       MESA_FORMAT_R_FLOAT16,
 653       fetch_texel_1d_f_r_f16,
 654       fetch_texel_2d_f_r_f16,
 655       fetch_texel_3d_f_r_f16,
 656       store_texel_r_f16
 657    },
 658    {
 659       MESA_FORMAT_RG_FLOAT32,
 660       fetch_texel_1d_f_rg_f32,
 661       fetch_texel_2d_f_rg_f32,
 662       fetch_texel_3d_f_rg_f32,
 663       store_texel_rg_f32
 664    },
 665    {
 666       MESA_FORMAT_RG_FLOAT16,
 667       fetch_texel_1d_f_rg_f16,
 668       fetch_texel_2d_f_rg_f16,
 669       fetch_texel_3d_f_rg_f16,
 670       store_texel_rg_f16
 671    },
 672
 673    {
 674       MESA_FORMAT_ALPHA_UINT8,
 675       NULL,
 676       NULL,
 677       NULL,
 678       NULL
 679    },
 680
 681    {
 682       MESA_FORMAT_ALPHA_UINT16,
 683       NULL,
 684       NULL,
 685       NULL,
 686       NULL
 687    },
 688
 689    {
 690       MESA_FORMAT_ALPHA_UINT32,
 691       NULL,
 692       NULL,
 693       NULL,
 694       NULL
 695    },
 696
 697    {
 698       MESA_FORMAT_ALPHA_INT8,
 699       NULL,
 700       NULL,
 701       NULL,
 702       NULL
 703    },
 704
 705    {
 706       MESA_FORMAT_ALPHA_INT16,
 707       NULL,
 708       NULL,
 709       NULL,
 710       NULL
 711    },
 712
 713    {
 714       MESA_FORMAT_ALPHA_INT32,
 715       NULL,
 716       NULL,
 717       NULL,
 718       NULL
 719    },
 720
 721
 722    {
 723       MESA_FORMAT_INTENSITY_UINT8,
 724       NULL,
 725       NULL,
 726       NULL,
 727       NULL
 728    },
 729
 730    {
 731       MESA_FORMAT_INTENSITY_UINT16,
 732       NULL,
 733       NULL,
 734       NULL,
 735       NULL
 736    },
 737
 738    {
 739       MESA_FORMAT_INTENSITY_UINT32,
 740       NULL,
 741       NULL,
 742       NULL,
 743       NULL
 744    },
 745
 746    {
 747       MESA_FORMAT_INTENSITY_INT8,
 748       NULL,
 749       NULL,
 750       NULL,
 751       NULL
 752    },
 753
 754    {
 755       MESA_FORMAT_INTENSITY_INT16,
 756       NULL,
 757       NULL,
 758       NULL,
 759       NULL
 760    },
 761
 762    {
 763       MESA_FORMAT_INTENSITY_INT32,
 764       NULL,
 765       NULL,
 766       NULL,
 767       NULL
 768    },
 769
 770
 771    {
 772       MESA_FORMAT_LUMINANCE_UINT8,
 773       NULL,
 774       NULL,
 775       NULL,
 776       NULL
 777    },
 778
 779    {
 780       MESA_FORMAT_LUMINANCE_UINT16,
 781       NULL,
 782       NULL,
 783       NULL,
 784       NULL
 785    },
 786
 787    {
 788       MESA_FORMAT_LUMINANCE_UINT32,
 789       NULL,
 790       NULL,
 791       NULL,
 792       NULL
 793    },
 794
 795    {
 796       MESA_FORMAT_LUMINANCE_INT8,
 797       NULL,
 798       NULL,
 799       NULL,
 800       NULL
 801    },
 802
 803    {
 804       MESA_FORMAT_LUMINANCE_INT16,
 805       NULL,
 806       NULL,
 807       NULL,
 808       NULL
 809    },
 810
 811    {
 812       MESA_FORMAT_LUMINANCE_INT32,
 813       NULL,
 814       NULL,
 815       NULL,
 816       NULL
 817    },
 818
 819
 820    {
 821       MESA_FORMAT_LUMINANCE_ALPHA_UINT8,
 822       NULL,
 823       NULL,
 824       NULL,
 825       NULL
 826    },
 827
 828    {
 829       MESA_FORMAT_LUMINANCE_ALPHA_UINT16,
 830       NULL,
 831       NULL,
 832       NULL,
 833       NULL
 834    },
 835
 836    {
 837       MESA_FORMAT_LUMINANCE_ALPHA_UINT32,
 838       NULL,
 839       NULL,
 840       NULL,
 841       NULL
 842    },
 843
 844    {
 845       MESA_FORMAT_LUMINANCE_ALPHA_INT8,
 846       NULL,
 847       NULL,
 848       NULL,
 849       NULL
 850    },
 851
 852    {
 853       MESA_FORMAT_LUMINANCE_ALPHA_INT16,
 854       NULL,
 855       NULL,
 856       NULL,
 857       NULL
 858    },
 859
 860    {
 861       MESA_FORMAT_LUMINANCE_ALPHA_INT32,
 862       NULL,
 863       NULL,
 864       NULL,
 865       NULL
 866    },
 867
 868
 869    {
 870       MESA_FORMAT_R_INT8,
 871       NULL,
 872       NULL,
 873       NULL,
 874       NULL
 875    },
 876
 877    {
 878       MESA_FORMAT_RG_INT8,
 879       NULL,
 880       NULL,
 881       NULL,
 882       NULL
 883    },
 884
 885    {
 886       MESA_FORMAT_RGB_INT8,
 887       NULL,
 888       NULL,
 889       NULL,
 890       NULL
 891    },
 892
 893    /* non-normalized, signed int */
 894    {
 895       MESA_FORMAT_RGBA_INT8,
 896       fetch_texel_1d_rgba_int8,
 897       fetch_texel_2d_rgba_int8,
 898       fetch_texel_3d_rgba_int8,
 899       store_texel_rgba_int8
 900    },
 901    {
 902       MESA_FORMAT_R_INT16,
 903       NULL,
 904       NULL,
 905       NULL,
 906       NULL
 907    },
 908    {
 909       MESA_FORMAT_RG_INT16,
 910       NULL,
 911       NULL,
 912       NULL,
 913       NULL
 914    },
 915    {
 916       MESA_FORMAT_RGB_INT16,
 917       NULL,
 918       NULL,
 919       NULL,
 920       NULL
 921    },
 922    {
 923       MESA_FORMAT_RGBA_INT16,
 924       fetch_texel_1d_rgba_int16,
 925       fetch_texel_2d_rgba_int16,
 926       fetch_texel_3d_rgba_int16,
 927       store_texel_rgba_int16
 928    },
 929    {
 930       MESA_FORMAT_R_INT32,
 931       NULL,
 932       NULL,
 933       NULL,
 934       NULL
 935    },
 936    {
 937       MESA_FORMAT_RG_INT32,
 938       NULL,
 939       NULL,
 940       NULL,
 941       NULL
 942    },
 943    {
 944       MESA_FORMAT_RGB_INT32,
 945       NULL,
 946       NULL,
 947       NULL,
 948       NULL
 949    },
 950    {
 951       MESA_FORMAT_RGBA_INT32,
 952       fetch_texel_1d_rgba_int32,
 953       fetch_texel_2d_rgba_int32,
 954       fetch_texel_3d_rgba_int32,
 955       store_texel_rgba_int32
 956    },
 957
 958    /* non-normalized, unsigned int */
 959    {
 960       MESA_FORMAT_R_UINT8,
 961       NULL,
 962       NULL,
 963       NULL,
 964       NULL
 965    },
 966    {
 967       MESA_FORMAT_RG_UINT8,
 968       NULL,
 969       NULL,
 970       NULL,
 971       NULL
 972    },
 973    {
 974       MESA_FORMAT_RGB_UINT8,
 975       NULL,
 976       NULL,
 977       NULL,
 978       NULL
 979    },
 980    {
 981       MESA_FORMAT_RGBA_UINT8,
 982       fetch_texel_1d_rgba_uint8,
 983       fetch_texel_2d_rgba_uint8,
 984       fetch_texel_3d_rgba_uint8,
 985       store_texel_rgba_uint8
 986    },
 987    {
 988       MESA_FORMAT_R_UINT16,
 989       NULL,
 990       NULL,
 991       NULL,
 992       NULL
 993    },
 994    {
 995       MESA_FORMAT_RG_UINT16,
 996       NULL,
 997       NULL,
 998       NULL,
 999       NULL
1000    },
1001    {
1002       MESA_FORMAT_RGB_UINT16,
1003       NULL,
1004       NULL,
1005       NULL,
1006       NULL
1007    },
1008    {
1009       MESA_FORMAT_RGBA_UINT16,
1010       fetch_texel_1d_rgba_uint16,
1011       fetch_texel_2d_rgba_uint16,
1012       fetch_texel_3d_rgba_uint16,
1013       store_texel_rgba_uint16
1014    },
1015    {
1016       MESA_FORMAT_R_UINT32,
1017       NULL,
1018       NULL,
1019       NULL,
1020       NULL
1021    },
1022    {
1023       MESA_FORMAT_RG_UINT32,
1024       NULL,
1025       NULL,
1026       NULL,
1027       NULL
1028    },
1029    {
1030       MESA_FORMAT_RGB_UINT32,
1031       NULL,
1032       NULL,
1033       NULL,
1034       NULL
1035    },
1036    {
1037       MESA_FORMAT_RGBA_UINT32,
1038       fetch_texel_1d_rgba_uint32,
1039       fetch_texel_2d_rgba_uint32,
1040       fetch_texel_3d_rgba_uint32,
1041       store_texel_rgba_uint32
1042    },
1043
1044    /* dudv */
1045    {
1046       MESA_FORMAT_DUDV8,
1047       fetch_texel_1d_dudv8,
1048       fetch_texel_2d_dudv8,
1049       fetch_texel_3d_dudv8,
1050       NULL
1051    },
1052
1053    /* signed, normalized */
1054    {
1055       MESA_FORMAT_SIGNED_R8,
1056       fetch_texel_1d_signed_r8,
1057       fetch_texel_2d_signed_r8,
1058       fetch_texel_3d_signed_r8,
1059       store_texel_signed_r8
1060    },
1061    {
1062       MESA_FORMAT_SIGNED_RG88_REV,
1063       fetch_texel_1d_signed_rg88_rev,
1064       fetch_texel_2d_signed_rg88_rev,
1065       fetch_texel_3d_signed_rg88_rev,
1066       store_texel_signed_rg88_rev
1067    },
1068    {
1069       MESA_FORMAT_SIGNED_RGBX8888,
1070       fetch_texel_1d_signed_rgbx8888,
1071       fetch_texel_2d_signed_rgbx8888,
1072       fetch_texel_3d_signed_rgbx8888,
1073       store_texel_signed_rgbx8888
1074    },
1075    {
1076       MESA_FORMAT_SIGNED_RGBA8888,
1077       fetch_texel_1d_signed_rgba8888,
1078       fetch_texel_2d_signed_rgba8888,
1079       fetch_texel_3d_signed_rgba8888,
1080       store_texel_signed_rgba8888
1081    },
1082    {
1083       MESA_FORMAT_SIGNED_RGBA8888_REV,
1084       fetch_texel_1d_signed_rgba8888_rev,
1085       fetch_texel_2d_signed_rgba8888_rev,
1086       fetch_texel_3d_signed_rgba8888_rev,
1087       store_texel_signed_rgba8888_rev
1088    },
1089    {
1090       MESA_FORMAT_SIGNED_R16,
1091       fetch_texel_1d_signed_r16,
1092       fetch_texel_2d_signed_r16,
1093       fetch_texel_3d_signed_r16,
1094       store_texel_signed_r16
1095    },
1096    {
1097       MESA_FORMAT_SIGNED_GR1616,
1098       fetch_texel_1d_signed_rg1616,
1099       fetch_texel_2d_signed_rg1616,
1100       fetch_texel_3d_signed_rg1616,
1101       store_texel_signed_rg1616
1102    },
1103    {
1104       MESA_FORMAT_SIGNED_RGB_16,
1105       fetch_texel_1d_signed_rgb_16,
1106       fetch_texel_2d_signed_rgb_16,
1107       fetch_texel_3d_signed_rgb_16,
1108       store_texel_signed_rgb_16
1109    },
1110    {
1111       MESA_FORMAT_SIGNED_RGBA_16,
1112       fetch_texel_1d_signed_rgba_16,
1113       fetch_texel_2d_signed_rgba_16,
1114       fetch_texel_3d_signed_rgba_16,
1115       store_texel_signed_rgba_16
1116    },
1117    {
1118       MESA_FORMAT_RGBA_16,
1119       fetch_texel_1d_rgba_16,
1120       fetch_texel_2d_rgba_16,
1121       fetch_texel_3d_rgba_16,
1122       store_texel_rgba_16
1123    },
1124    {
1125       MESA_FORMAT_RED_RGTC1,
1126       NULL,
1127       _mesa_fetch_texel_2d_f_red_rgtc1,
1128       NULL,
1129       NULL
1130    },
1131    {
1132       MESA_FORMAT_SIGNED_RED_RGTC1,
1133       NULL,
1134       _mesa_fetch_texel_2d_f_signed_red_rgtc1,
1135       NULL,
1136       NULL
1137    },
1138    {
1139       MESA_FORMAT_RG_RGTC2,
1140       NULL,
1141       _mesa_fetch_texel_2d_f_rg_rgtc2,
1142       NULL,
1143       NULL
1144    },
1145    {
1146       MESA_FORMAT_SIGNED_RG_RGTC2,
1147       NULL,
1148       _mesa_fetch_texel_2d_f_signed_rg_rgtc2,
1149       NULL,
1150       NULL
1151    },
1152    {
1153       MESA_FORMAT_L_LATC1,
1154       NULL,
1155       _mesa_fetch_texel_2d_f_l_latc1,
1156       NULL,
1157       NULL
1158    },
1159    {
1160       MESA_FORMAT_SIGNED_L_LATC1,
1161       NULL,
1162       _mesa_fetch_texel_2d_f_signed_l_latc1,
1163       NULL,
1164       NULL
1165    },
1166    {
1167       MESA_FORMAT_LA_LATC2,
1168       NULL,
1169       _mesa_fetch_texel_2d_f_la_latc2,
1170       NULL,
1171       NULL
1172    },
1173    {
1174       MESA_FORMAT_SIGNED_LA_LATC2,
1175       NULL,
1176       _mesa_fetch_texel_2d_f_signed_la_latc2,
1177       NULL,
1178       NULL
1179    },
1180    {
1181       MESA_FORMAT_SIGNED_A8,
1182       fetch_texel_1d_signed_a8,
1183       fetch_texel_2d_signed_a8,
1184       fetch_texel_3d_signed_a8,
1185       store_texel_signed_a8
1186    },
1187    {
1188       MESA_FORMAT_SIGNED_L8,
1189       fetch_texel_1d_signed_l8,
1190       fetch_texel_2d_signed_l8,
1191       fetch_texel_3d_signed_l8,
1192       store_texel_signed_l8
1193    },
1194    {
1195       MESA_FORMAT_SIGNED_AL88,
1196       fetch_texel_1d_signed_al88,
1197       fetch_texel_2d_signed_al88,
1198       fetch_texel_3d_signed_al88,
1199       store_texel_signed_al88
1200    },
1201    {
1202       MESA_FORMAT_SIGNED_I8,
1203       fetch_texel_1d_signed_i8,
1204       fetch_texel_2d_signed_i8,
1205       fetch_texel_3d_signed_i8,
1206       store_texel_signed_i8
1207    },
1208    {
1209       MESA_FORMAT_SIGNED_A16,
1210       fetch_texel_1d_signed_a16,
1211       fetch_texel_2d_signed_a16,
1212       fetch_texel_3d_signed_a16,
1213       store_texel_signed_a16
1214    },
1215    {
1216       MESA_FORMAT_SIGNED_L16,
1217       fetch_texel_1d_signed_l16,
1218       fetch_texel_2d_signed_l16,
1219       fetch_texel_3d_signed_l16,
1220       store_texel_signed_l16
1221    },
1222    {
1223       MESA_FORMAT_SIGNED_AL1616,
1224       fetch_texel_1d_signed_al1616,
1225       fetch_texel_2d_signed_al1616,
1226       fetch_texel_3d_signed_al1616,
1227       store_texel_signed_al1616
1228    },
1229    {
1230       MESA_FORMAT_SIGNED_I16,
1231       fetch_texel_1d_signed_i16,
1232       fetch_texel_2d_signed_i16,
1233       fetch_texel_3d_signed_i16,
1234       store_texel_signed_i16
1235    },
1236    {
1237       MESA_FORMAT_RGB9_E5_FLOAT,
1238       fetch_texel_1d_rgb9_e5,
1239       fetch_texel_2d_rgb9_e5,
1240       fetch_texel_3d_rgb9_e5,
1241       store_texel_rgb9_e5
1242    },
1243    {
1244       MESA_FORMAT_R11_G11_B10_FLOAT,
1245       fetch_texel_1d_r11_g11_b10f,
1246       fetch_texel_2d_r11_g11_b10f,
1247       fetch_texel_3d_r11_g11_b10f,
1248       store_texel_r11_g11_b10f
1249    },
1250    {
1251       MESA_FORMAT_Z32_FLOAT,
1252       fetch_texel_1d_f_r_f32, /* Reuse the R32F functions. */
1253       fetch_texel_2d_f_r_f32,
1254       fetch_texel_3d_f_r_f32,
1255       store_texel_r_f32
1256    },
1257    {
1258       MESA_FORMAT_Z32_FLOAT_X24S8,
1259       fetch_texel_1d_z32f_x24s8,
1260       fetch_texel_2d_z32f_x24s8,
1261       fetch_texel_3d_z32f_x24s8,
1262       store_texel_z32f_x24s8
1263    },
1264    {
1265       MESA_FORMAT_ARGB2101010_UINT,
1266       NULL,
1267       NULL,
1268       NULL,
1269       NULL
1270    }
1271 };
1272
1273
1274 FetchTexelFunc
1275 _mesa_get_texel_fetch_func(gl_format format, GLuint dims)
1276 {
1277 #ifdef DEBUG
1278    /* check that the table entries are sorted by format name */
1279    gl_format fmt;
1280    for (fmt = 0; fmt < MESA_FORMAT_COUNT; fmt++) {
1281       assert(texfetch_funcs[fmt].Name == fmt);
1282    }
1283 #endif
1284
1285    assert(Elements(texfetch_funcs) == MESA_FORMAT_COUNT);
1286    assert(format < MESA_FORMAT_COUNT);
1287
1288    switch (dims) {
1289    case 1:
1290       return texfetch_funcs[format].Fetch1D;
1291    case 2:
1292       return texfetch_funcs[format].Fetch2D;
1293    case 3:
1294       return texfetch_funcs[format].Fetch3D;
1295    default:
1296       assert(0 && "bad dims in _mesa_get_texel_fetch_func");
1297       return NULL;
1298    }
1299 }
1300
1301
1302 StoreTexelFunc
1303 _mesa_get_texel_store_func(gl_format format)
1304 {
1305    assert(format < MESA_FORMAT_COUNT);
1306    return texfetch_funcs[format].StoreTexel;
1307 }
1308
1309
1310 /**
1311  * Initialize the texture image's FetchTexel methods.
1312  */
1313 static void
1314 set_fetch_functions(struct swrast_texture_image *texImage, GLuint dims)
1315 {
1316    gl_format format = texImage->Base.TexFormat;
1317
1318    ASSERT(dims == 1 || dims == 2 || dims == 3);
1319
1320    if (texImage->Base.TexObject->Sampler.sRGBDecode == GL_SKIP_DECODE_EXT &&
1321        _mesa_get_format_color_encoding(format) == GL_SRGB) {
1322       format = _mesa_get_srgb_format_linear(format);
1323    }
1324
1325    texImage->FetchTexel = _mesa_get_texel_fetch_func(format, dims);
1326    ASSERT(texImage->FetchTexel);
1327 }
1328
1329 void
1330 _mesa_update_fetch_functions(struct gl_texture_object *texObj)
1331 {
1332    GLuint face, i;
1333    GLuint dims;
1334
1335    dims = _mesa_get_texture_dimensions(texObj->Target);
1336
1337    for (face = 0; face < 6; face++) {
1338       for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
1339          if (texObj->Image[face][i]) {
1340             set_fetch_functions(swrast_texture_image(texObj->Image[face][i]),
1341                                 dims);
1342          }
1343       }
1344    }
1345 }