src/mesa/main/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 texfetch.c
  29  *
  30  * Texel fetch/store functions
  31  *
  32  * \author Gareth Hughes
  33  */
  34
  35
  36 #include "colormac.h"
  37 #include "macros.h"
  38 #include "texcompress.h"
  39 #include "texcompress_fxt1.h"
  40 #include "texcompress_s3tc.h"
  41 #include "texcompress_rgtc.h"
  42 #include "texfetch.h"
  43 #include "teximage.h"
  44 #include "../../gallium/auxiliary/util/u_format_rgb9e5.h"
  45
  46
  47 /**
  48  * Convert an 8-bit sRGB value from non-linear space to a
  49  * linear RGB value in [0, 1].
  50  * Implemented with a 256-entry lookup table.
  51  */
  52 static INLINE GLfloat
  53 nonlinear_to_linear(GLubyte cs8)
  54 {
  55    static GLfloat table[256];
  56    static GLboolean tableReady = GL_FALSE;
  57    if (!tableReady) {
  58       /* compute lookup table now */
  59       GLuint i;
  60       for (i = 0; i < 256; i++) {
  61          const GLfloat cs = UBYTE_TO_FLOAT(i);
  62          if (cs <= 0.04045) {
  63             table[i] = cs / 12.92f;
  64          }
  65          else {
  66             table[i] = (GLfloat) pow((cs + 0.055) / 1.055, 2.4);
  67          }
  68       }
  69       tableReady = GL_TRUE;
  70    }
  71    return table[cs8];
  72 }
  73
  74
  75
  76 /* Texel fetch routines for all supported formats
  77  */
  78 #define DIM 1
  79 #include "texfetch_tmp.h"
  80
  81 #define DIM 2
  82 #include "texfetch_tmp.h"
  83
  84 #define DIM 3
  85 #include "texfetch_tmp.h"
  86
  87 /**
  88  * Null texel fetch function.
  89  *
  90  * Have to have this so the FetchTexel function pointer is never NULL.
  91  */
  92 static void fetch_null_texelf( const struct gl_texture_image *texImage,
  93                                GLint i, GLint j, GLint k, GLfloat *texel )
  94 {
  95    (void) texImage; (void) i; (void) j; (void) k;
  96    texel[RCOMP] = 0.0;
  97    texel[GCOMP] = 0.0;
  98    texel[BCOMP] = 0.0;
  99    texel[ACOMP] = 0.0;
 100    _mesa_warning(NULL, "fetch_null_texelf() called!");
 101 }
 102
 103 static void store_null_texel(struct gl_texture_image *texImage,
 104                              GLint i, GLint j, GLint k, const void *texel)
 105 {
 106    (void) texImage;
 107    (void) i;
 108    (void) j;
 109    (void) k;
 110    (void) texel;
 111    /* no-op */
 112 }
 113
 114
 115
 116 /**
 117  * Table to map MESA_FORMAT_ to texel fetch/store funcs.
 118  * XXX this is somewhat temporary.
 119  */
 120 static struct {
 121    gl_format Name;
 122    FetchTexelFuncF Fetch1D;
 123    FetchTexelFuncF Fetch2D;
 124    FetchTexelFuncF Fetch3D;
 125    StoreTexelFunc StoreTexel;
 126 }
 127 texfetch_funcs[MESA_FORMAT_COUNT] =
 128 {
 129    {
 130       MESA_FORMAT_NONE,
 131       fetch_null_texelf,
 132       fetch_null_texelf,
 133       fetch_null_texelf,
 134       store_null_texel
 135    },
 136
 137    {
 138       MESA_FORMAT_RGBA8888,
 139       fetch_texel_1d_f_rgba8888,
 140       fetch_texel_2d_f_rgba8888,
 141       fetch_texel_3d_f_rgba8888,
 142       store_texel_rgba8888
 143    },
 144    {
 145       MESA_FORMAT_RGBA8888_REV,
 146       fetch_texel_1d_f_rgba8888_rev,
 147       fetch_texel_2d_f_rgba8888_rev,
 148       fetch_texel_3d_f_rgba8888_rev,
 149       store_texel_rgba8888_rev
 150    },
 151    {
 152       MESA_FORMAT_ARGB8888,
 153       fetch_texel_1d_f_argb8888,
 154       fetch_texel_2d_f_argb8888,
 155       fetch_texel_3d_f_argb8888,
 156       store_texel_argb8888
 157    },
 158    {
 159       MESA_FORMAT_ARGB8888_REV,
 160       fetch_texel_1d_f_argb8888_rev,
 161       fetch_texel_2d_f_argb8888_rev,
 162       fetch_texel_3d_f_argb8888_rev,
 163       store_texel_argb8888_rev
 164    },
 165    {
 166       MESA_FORMAT_XRGB8888,
 167       fetch_texel_1d_f_xrgb8888,
 168       fetch_texel_2d_f_xrgb8888,
 169       fetch_texel_3d_f_xrgb8888,
 170       store_texel_xrgb8888
 171    },
 172    {
 173       MESA_FORMAT_XRGB8888_REV,
 174       fetch_texel_1d_f_xrgb8888_rev,
 175       fetch_texel_2d_f_xrgb8888_rev,
 176       fetch_texel_3d_f_xrgb8888_rev,
 177       store_texel_xrgb8888_rev,
 178    },
 179    {
 180       MESA_FORMAT_RGB888,
 181       fetch_texel_1d_f_rgb888,
 182       fetch_texel_2d_f_rgb888,
 183       fetch_texel_3d_f_rgb888,
 184       store_texel_rgb888
 185    },
 186    {
 187       MESA_FORMAT_BGR888,
 188       fetch_texel_1d_f_bgr888,
 189       fetch_texel_2d_f_bgr888,
 190       fetch_texel_3d_f_bgr888,
 191       store_texel_bgr888
 192    },
 193    {
 194       MESA_FORMAT_RGB565,
 195       fetch_texel_1d_f_rgb565,
 196       fetch_texel_2d_f_rgb565,
 197       fetch_texel_3d_f_rgb565,
 198       store_texel_rgb565
 199    },
 200    {
 201       MESA_FORMAT_RGB565_REV,
 202       fetch_texel_1d_f_rgb565_rev,
 203       fetch_texel_2d_f_rgb565_rev,
 204       fetch_texel_3d_f_rgb565_rev,
 205       store_texel_rgb565_rev
 206    },
 207    {
 208       MESA_FORMAT_ARGB4444,
 209       fetch_texel_1d_f_argb4444,
 210       fetch_texel_2d_f_argb4444,
 211       fetch_texel_3d_f_argb4444,
 212       store_texel_argb4444
 213    },
 214    {
 215       MESA_FORMAT_ARGB4444_REV,
 216       fetch_texel_1d_f_argb4444_rev,
 217       fetch_texel_2d_f_argb4444_rev,
 218       fetch_texel_3d_f_argb4444_rev,
 219       store_texel_argb4444_rev
 220    },
 221    {
 222       MESA_FORMAT_RGBA5551,
 223       fetch_texel_1d_f_rgba5551,
 224       fetch_texel_2d_f_rgba5551,
 225       fetch_texel_3d_f_rgba5551,
 226       store_texel_rgba5551
 227    },
 228    {
 229       MESA_FORMAT_ARGB1555,
 230       fetch_texel_1d_f_argb1555,
 231       fetch_texel_2d_f_argb1555,
 232       fetch_texel_3d_f_argb1555,
 233       store_texel_argb1555
 234    },
 235    {
 236       MESA_FORMAT_ARGB1555_REV,
 237       fetch_texel_1d_f_argb1555_rev,
 238       fetch_texel_2d_f_argb1555_rev,
 239       fetch_texel_3d_f_argb1555_rev,
 240       store_texel_argb1555_rev
 241    },
 242    {
 243       MESA_FORMAT_AL44,
 244       fetch_texel_1d_f_al44,
 245       fetch_texel_2d_f_al44,
 246       fetch_texel_3d_f_al44,
 247       store_texel_al44
 248    },
 249    {
 250       MESA_FORMAT_AL88,
 251       fetch_texel_1d_f_al88,
 252       fetch_texel_2d_f_al88,
 253       fetch_texel_3d_f_al88,
 254       store_texel_al88
 255    },
 256    {
 257       MESA_FORMAT_AL88_REV,
 258       fetch_texel_1d_f_al88_rev,
 259       fetch_texel_2d_f_al88_rev,
 260       fetch_texel_3d_f_al88_rev,
 261       store_texel_al88_rev
 262    },
 263    {
 264       MESA_FORMAT_AL1616,
 265       fetch_texel_1d_f_al1616,
 266       fetch_texel_2d_f_al1616,
 267       fetch_texel_3d_f_al1616,
 268       store_texel_al1616
 269    },
 270    {
 271       MESA_FORMAT_AL1616_REV,
 272       fetch_texel_1d_f_al1616_rev,
 273       fetch_texel_2d_f_al1616_rev,
 274       fetch_texel_3d_f_al1616_rev,
 275       store_texel_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       store_texel_rgb332
 283    },
 284    {
 285       MESA_FORMAT_A8,
 286       fetch_texel_1d_f_a8,
 287       fetch_texel_2d_f_a8,
 288       fetch_texel_3d_f_a8,
 289       store_texel_a8
 290    },
 291    {
 292       MESA_FORMAT_A16,
 293       fetch_texel_1d_f_a16,
 294       fetch_texel_2d_f_a16,
 295       fetch_texel_3d_f_a16,
 296       store_texel_a16
 297    },
 298    {
 299       MESA_FORMAT_L8,
 300       fetch_texel_1d_f_l8,
 301       fetch_texel_2d_f_l8,
 302       fetch_texel_3d_f_l8,
 303       store_texel_l8
 304    },
 305    {
 306       MESA_FORMAT_L16,
 307       fetch_texel_1d_f_l16,
 308       fetch_texel_2d_f_l16,
 309       fetch_texel_3d_f_l16,
 310       store_texel_l16
 311    },
 312    {
 313       MESA_FORMAT_I8,
 314       fetch_texel_1d_f_i8,
 315       fetch_texel_2d_f_i8,
 316       fetch_texel_3d_f_i8,
 317       store_texel_i8
 318    },
 319    {
 320       MESA_FORMAT_I16,
 321       fetch_texel_1d_f_i16,
 322       fetch_texel_2d_f_i16,
 323       fetch_texel_3d_f_i16,
 324       store_texel_i16
 325    },
 326    {
 327       MESA_FORMAT_CI8,
 328       fetch_texel_1d_f_ci8,
 329       fetch_texel_2d_f_ci8,
 330       fetch_texel_3d_f_ci8,
 331       store_texel_ci8
 332    },
 333    {
 334       MESA_FORMAT_YCBCR,
 335       fetch_texel_1d_f_ycbcr,
 336       fetch_texel_2d_f_ycbcr,
 337       fetch_texel_3d_f_ycbcr,
 338       store_texel_ycbcr
 339    },
 340    {
 341       MESA_FORMAT_YCBCR_REV,
 342       fetch_texel_1d_f_ycbcr_rev,
 343       fetch_texel_2d_f_ycbcr_rev,
 344       fetch_texel_3d_f_ycbcr_rev,
 345       store_texel_ycbcr_rev
 346    },
 347    {
 348       MESA_FORMAT_R8,
 349       fetch_texel_1d_f_r8,
 350       fetch_texel_2d_f_r8,
 351       fetch_texel_3d_f_r8,
 352       store_texel_r8,
 353    },
 354    {
 355       MESA_FORMAT_RG88,
 356       fetch_texel_1d_f_rg88,
 357       fetch_texel_2d_f_rg88,
 358       fetch_texel_3d_f_rg88,
 359       store_texel_rg88,
 360    },
 361    {
 362       MESA_FORMAT_RG88_REV,
 363       fetch_texel_1d_f_rg88_rev,
 364       fetch_texel_2d_f_rg88_rev,
 365       fetch_texel_3d_f_rg88_rev,
 366       store_texel_rg88_rev,
 367    },
 368    {
 369       MESA_FORMAT_R16,
 370       fetch_texel_1d_f_r16,
 371       fetch_texel_2d_f_r16,
 372       fetch_texel_3d_f_r16,
 373       store_texel_r16,
 374    },
 375    {
 376       MESA_FORMAT_RG1616,
 377       fetch_texel_1d_f_rg1616,
 378       fetch_texel_2d_f_rg1616,
 379       fetch_texel_3d_f_rg1616,
 380       store_texel_rg1616,
 381    },
 382    {
 383       MESA_FORMAT_RG1616_REV,
 384       fetch_texel_1d_f_rg1616_rev,
 385       fetch_texel_2d_f_rg1616_rev,
 386       fetch_texel_3d_f_rg1616_rev,
 387       store_texel_rg1616_rev,
 388    },
 389    {
 390       MESA_FORMAT_ARGB2101010,
 391       fetch_texel_1d_f_argb2101010,
 392       fetch_texel_2d_f_argb2101010,
 393       fetch_texel_3d_f_argb2101010,
 394       store_texel_argb2101010
 395    },
 396    {
 397       MESA_FORMAT_Z24_S8,
 398       fetch_texel_1d_f_z24_s8,
 399       fetch_texel_2d_f_z24_s8,
 400       fetch_texel_3d_f_z24_s8,
 401       store_texel_z24_s8
 402    },
 403    {
 404       MESA_FORMAT_S8_Z24,
 405       fetch_texel_1d_f_s8_z24,
 406       fetch_texel_2d_f_s8_z24,
 407       fetch_texel_3d_f_s8_z24,
 408       store_texel_s8_z24
 409    },
 410    {
 411       MESA_FORMAT_Z16,
 412       fetch_texel_1d_f_z16,
 413       fetch_texel_2d_f_z16,
 414       fetch_texel_3d_f_z16,
 415       store_texel_z16
 416    },
 417    {
 418       MESA_FORMAT_X8_Z24,
 419       fetch_texel_1d_f_s8_z24,
 420       fetch_texel_2d_f_s8_z24,
 421       fetch_texel_3d_f_s8_z24,
 422       store_texel_s8_z24
 423    },
 424    {
 425       MESA_FORMAT_Z24_X8,
 426       fetch_texel_1d_f_z24_s8,
 427       fetch_texel_2d_f_z24_s8,
 428       fetch_texel_3d_f_z24_s8,
 429       store_texel_z24_s8
 430    },
 431    {
 432       MESA_FORMAT_Z32,
 433       fetch_texel_1d_f_z32,
 434       fetch_texel_2d_f_z32,
 435       fetch_texel_3d_f_z32,
 436       store_texel_z32
 437    },
 438    {
 439       MESA_FORMAT_S8,
 440       NULL,
 441       NULL,
 442       NULL,
 443       NULL
 444    },
 445    {
 446       MESA_FORMAT_SRGB8,
 447       fetch_texel_1d_srgb8,
 448       fetch_texel_2d_srgb8,
 449       fetch_texel_3d_srgb8,
 450       store_texel_srgb8
 451    },
 452    {
 453       MESA_FORMAT_SRGBA8,
 454       fetch_texel_1d_srgba8,
 455       fetch_texel_2d_srgba8,
 456       fetch_texel_3d_srgba8,
 457       store_texel_srgba8
 458    },
 459    {
 460       MESA_FORMAT_SARGB8,
 461       fetch_texel_1d_sargb8,
 462       fetch_texel_2d_sargb8,
 463       fetch_texel_3d_sargb8,
 464       store_texel_sargb8
 465    },
 466    {
 467       MESA_FORMAT_SL8,
 468       fetch_texel_1d_sl8,
 469       fetch_texel_2d_sl8,
 470       fetch_texel_3d_sl8,
 471       store_texel_sl8
 472    },
 473    {
 474       MESA_FORMAT_SLA8,
 475       fetch_texel_1d_sla8,
 476       fetch_texel_2d_sla8,
 477       fetch_texel_3d_sla8,
 478       store_texel_sla8
 479    },
 480    {
 481       MESA_FORMAT_SRGB_DXT1,
 482       NULL,
 483       _mesa_fetch_texel_2d_f_srgb_dxt1,
 484       NULL,
 485       NULL
 486    },
 487    {
 488       MESA_FORMAT_SRGBA_DXT1,
 489       NULL,
 490       _mesa_fetch_texel_2d_f_srgba_dxt1,
 491       NULL,
 492       NULL
 493    },
 494    {
 495       MESA_FORMAT_SRGBA_DXT3,
 496       NULL,
 497       _mesa_fetch_texel_2d_f_srgba_dxt3,
 498       NULL,
 499       NULL
 500    },
 501    {
 502       MESA_FORMAT_SRGBA_DXT5,
 503       NULL,
 504       _mesa_fetch_texel_2d_f_srgba_dxt5,
 505       NULL,
 506       NULL
 507    },
 508
 509    {
 510       MESA_FORMAT_RGB_FXT1,
 511       NULL,
 512       _mesa_fetch_texel_2d_f_rgb_fxt1,
 513       NULL,
 514       NULL
 515    },
 516    {
 517       MESA_FORMAT_RGBA_FXT1,
 518       NULL,
 519       _mesa_fetch_texel_2d_f_rgba_fxt1,
 520       NULL,
 521       NULL
 522    },
 523    {
 524       MESA_FORMAT_RGB_DXT1,
 525       NULL,
 526       _mesa_fetch_texel_2d_f_rgb_dxt1,
 527       NULL,
 528       NULL
 529    },
 530    {
 531       MESA_FORMAT_RGBA_DXT1,
 532       NULL,
 533       _mesa_fetch_texel_2d_f_rgba_dxt1,
 534       NULL,
 535       NULL
 536    },
 537    {
 538       MESA_FORMAT_RGBA_DXT3,
 539       NULL,
 540       _mesa_fetch_texel_2d_f_rgba_dxt3,
 541       NULL,
 542       NULL
 543    },
 544    {
 545       MESA_FORMAT_RGBA_DXT5,
 546       NULL,
 547       _mesa_fetch_texel_2d_f_rgba_dxt5,
 548       NULL,
 549       NULL
 550    },
 551    {
 552       MESA_FORMAT_RGBA_FLOAT32,
 553       fetch_texel_1d_f_rgba_f32,
 554       fetch_texel_2d_f_rgba_f32,
 555       fetch_texel_3d_f_rgba_f32,
 556       store_texel_rgba_f32
 557    },
 558    {
 559       MESA_FORMAT_RGBA_FLOAT16,
 560       fetch_texel_1d_f_rgba_f16,
 561       fetch_texel_2d_f_rgba_f16,
 562       fetch_texel_3d_f_rgba_f16,
 563       store_texel_rgba_f16
 564    },
 565    {
 566       MESA_FORMAT_RGB_FLOAT32,
 567       fetch_texel_1d_f_rgb_f32,
 568       fetch_texel_2d_f_rgb_f32,
 569       fetch_texel_3d_f_rgb_f32,
 570       store_texel_rgb_f32
 571    },
 572    {
 573       MESA_FORMAT_RGB_FLOAT16,
 574       fetch_texel_1d_f_rgb_f16,
 575       fetch_texel_2d_f_rgb_f16,
 576       fetch_texel_3d_f_rgb_f16,
 577       store_texel_rgb_f16
 578    },
 579    {
 580       MESA_FORMAT_ALPHA_FLOAT32,
 581       fetch_texel_1d_f_alpha_f32,
 582       fetch_texel_2d_f_alpha_f32,
 583       fetch_texel_3d_f_alpha_f32,
 584       store_texel_alpha_f32
 585    },
 586    {
 587       MESA_FORMAT_ALPHA_FLOAT16,
 588       fetch_texel_1d_f_alpha_f16,
 589       fetch_texel_2d_f_alpha_f16,
 590       fetch_texel_3d_f_alpha_f16,
 591       store_texel_alpha_f16
 592    },
 593    {
 594       MESA_FORMAT_LUMINANCE_FLOAT32,
 595       fetch_texel_1d_f_luminance_f32,
 596       fetch_texel_2d_f_luminance_f32,
 597       fetch_texel_3d_f_luminance_f32,
 598       store_texel_luminance_f32
 599    },
 600    {
 601       MESA_FORMAT_LUMINANCE_FLOAT16,
 602       fetch_texel_1d_f_luminance_f16,
 603       fetch_texel_2d_f_luminance_f16,
 604       fetch_texel_3d_f_luminance_f16,
 605       store_texel_luminance_f16
 606    },
 607    {
 608       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32,
 609       fetch_texel_1d_f_luminance_alpha_f32,
 610       fetch_texel_2d_f_luminance_alpha_f32,
 611       fetch_texel_3d_f_luminance_alpha_f32,
 612       store_texel_luminance_alpha_f32
 613    },
 614    {
 615       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16,
 616       fetch_texel_1d_f_luminance_alpha_f16,
 617       fetch_texel_2d_f_luminance_alpha_f16,
 618       fetch_texel_3d_f_luminance_alpha_f16,
 619       store_texel_luminance_alpha_f16
 620    },
 621    {
 622       MESA_FORMAT_INTENSITY_FLOAT32,
 623       fetch_texel_1d_f_intensity_f32,
 624       fetch_texel_2d_f_intensity_f32,
 625       fetch_texel_3d_f_intensity_f32,
 626       store_texel_intensity_f32
 627    },
 628    {
 629       MESA_FORMAT_INTENSITY_FLOAT16,
 630       fetch_texel_1d_f_intensity_f16,
 631       fetch_texel_2d_f_intensity_f16,
 632       fetch_texel_3d_f_intensity_f16,
 633       store_texel_intensity_f16
 634    },
 635    {
 636       MESA_FORMAT_R_FLOAT32,
 637       fetch_texel_1d_f_r_f32,
 638       fetch_texel_2d_f_r_f32,
 639       fetch_texel_3d_f_r_f32,
 640       store_texel_r_f32
 641    },
 642    {
 643       MESA_FORMAT_R_FLOAT16,
 644       fetch_texel_1d_f_r_f16,
 645       fetch_texel_2d_f_r_f16,
 646       fetch_texel_3d_f_r_f16,
 647       store_texel_r_f16
 648    },
 649    {
 650       MESA_FORMAT_RG_FLOAT32,
 651       fetch_texel_1d_f_rg_f32,
 652       fetch_texel_2d_f_rg_f32,
 653       fetch_texel_3d_f_rg_f32,
 654       store_texel_rg_f32
 655    },
 656    {
 657       MESA_FORMAT_RG_FLOAT16,
 658       fetch_texel_1d_f_rg_f16,
 659       fetch_texel_2d_f_rg_f16,
 660       fetch_texel_3d_f_rg_f16,
 661       store_texel_rg_f16
 662    },
 663
 664    /* non-normalized, signed int */
 665    {
 666       MESA_FORMAT_RGBA_INT8,
 667       fetch_texel_1d_rgba_int8,
 668       fetch_texel_2d_rgba_int8,
 669       fetch_texel_3d_rgba_int8,
 670       store_texel_rgba_int8
 671    },
 672    {
 673       MESA_FORMAT_RGBA_INT16,
 674       fetch_texel_1d_rgba_int16,
 675       fetch_texel_2d_rgba_int16,
 676       fetch_texel_3d_rgba_int16,
 677       store_texel_rgba_int16
 678    },
 679    {
 680       MESA_FORMAT_RGBA_INT32,
 681       fetch_texel_1d_rgba_int32,
 682       fetch_texel_2d_rgba_int32,
 683       fetch_texel_3d_rgba_int32,
 684       store_texel_rgba_int32
 685    },
 686
 687    /* non-normalized, unsigned int */
 688    {
 689       MESA_FORMAT_RGBA_UINT8,
 690       fetch_texel_1d_rgba_uint8,
 691       fetch_texel_2d_rgba_uint8,
 692       fetch_texel_3d_rgba_uint8,
 693       store_texel_rgba_uint8
 694    },
 695    {
 696       MESA_FORMAT_RGBA_UINT16,
 697       fetch_texel_1d_rgba_uint16,
 698       fetch_texel_2d_rgba_uint16,
 699       fetch_texel_3d_rgba_uint16,
 700       store_texel_rgba_uint16
 701    },
 702    {
 703       MESA_FORMAT_RGBA_UINT32,
 704       fetch_texel_1d_rgba_uint32,
 705       fetch_texel_2d_rgba_uint32,
 706       fetch_texel_3d_rgba_uint32,
 707       store_texel_rgba_uint32
 708    },
 709
 710    /* dudv */
 711    {
 712       MESA_FORMAT_DUDV8,
 713       fetch_texel_1d_dudv8,
 714       fetch_texel_2d_dudv8,
 715       fetch_texel_3d_dudv8,
 716       NULL
 717    },
 718
 719    /* signed, normalized */
 720    {
 721       MESA_FORMAT_SIGNED_R8,
 722       fetch_texel_1d_signed_r8,
 723       fetch_texel_2d_signed_r8,
 724       fetch_texel_3d_signed_r8,
 725       store_texel_signed_r8
 726    },
 727    {
 728       MESA_FORMAT_SIGNED_RG88_REV,
 729       fetch_texel_1d_signed_rg88_rev,
 730       fetch_texel_2d_signed_rg88_rev,
 731       fetch_texel_3d_signed_rg88_rev,
 732       store_texel_signed_rg88_rev
 733    },
 734    {
 735       MESA_FORMAT_SIGNED_RGBX8888,
 736       fetch_texel_1d_signed_rgbx8888,
 737       fetch_texel_2d_signed_rgbx8888,
 738       fetch_texel_3d_signed_rgbx8888,
 739       store_texel_signed_rgbx8888
 740    },
 741    {
 742       MESA_FORMAT_SIGNED_RGBA8888,
 743       fetch_texel_1d_signed_rgba8888,
 744       fetch_texel_2d_signed_rgba8888,
 745       fetch_texel_3d_signed_rgba8888,
 746       store_texel_signed_rgba8888
 747    },
 748    {
 749       MESA_FORMAT_SIGNED_RGBA8888_REV,
 750       fetch_texel_1d_signed_rgba8888_rev,
 751       fetch_texel_2d_signed_rgba8888_rev,
 752       fetch_texel_3d_signed_rgba8888_rev,
 753       store_texel_signed_rgba8888_rev
 754    },
 755    {
 756       MESA_FORMAT_SIGNED_R16,
 757       fetch_texel_1d_signed_r16,
 758       fetch_texel_2d_signed_r16,
 759       fetch_texel_3d_signed_r16,
 760       store_texel_signed_r16
 761    },
 762    {
 763       MESA_FORMAT_SIGNED_GR1616,
 764       fetch_texel_1d_signed_rg1616,
 765       fetch_texel_2d_signed_rg1616,
 766       fetch_texel_3d_signed_rg1616,
 767       store_texel_signed_rg1616
 768    },
 769    {
 770       MESA_FORMAT_SIGNED_RGB_16,
 771       fetch_texel_1d_signed_rgb_16,
 772       fetch_texel_2d_signed_rgb_16,
 773       fetch_texel_3d_signed_rgb_16,
 774       store_texel_signed_rgb_16
 775    },
 776    {
 777       MESA_FORMAT_SIGNED_RGBA_16,
 778       fetch_texel_1d_signed_rgba_16,
 779       fetch_texel_2d_signed_rgba_16,
 780       fetch_texel_3d_signed_rgba_16,
 781       store_texel_signed_rgba_16
 782    },
 783    {
 784       MESA_FORMAT_RGBA_16,
 785       fetch_texel_1d_rgba_16,
 786       fetch_texel_2d_rgba_16,
 787       fetch_texel_3d_rgba_16,
 788       store_texel_rgba_16
 789    },
 790    {
 791       MESA_FORMAT_RED_RGTC1,
 792       NULL,
 793       _mesa_fetch_texel_2d_f_red_rgtc1,
 794       NULL,
 795       NULL
 796    },
 797    {
 798       MESA_FORMAT_SIGNED_RED_RGTC1,
 799       NULL,
 800       _mesa_fetch_texel_2d_f_signed_red_rgtc1,
 801       NULL,
 802       NULL
 803    },
 804    {
 805       MESA_FORMAT_RG_RGTC2,
 806       NULL,
 807       _mesa_fetch_texel_2d_f_rg_rgtc2,
 808       NULL,
 809       NULL
 810    },
 811    {
 812       MESA_FORMAT_SIGNED_RG_RGTC2,
 813       NULL,
 814       _mesa_fetch_texel_2d_f_signed_rg_rgtc2,
 815       NULL,
 816       NULL
 817    },
 818    {
 819       MESA_FORMAT_L_LATC1,
 820       NULL,
 821       _mesa_fetch_texel_2d_f_l_latc1,
 822       NULL,
 823       NULL
 824    },
 825    {
 826       MESA_FORMAT_SIGNED_L_LATC1,
 827       NULL,
 828       _mesa_fetch_texel_2d_f_signed_l_latc1,
 829       NULL,
 830       NULL
 831    },
 832    {
 833       MESA_FORMAT_LA_LATC2,
 834       NULL,
 835       _mesa_fetch_texel_2d_f_la_latc2,
 836       NULL,
 837       NULL
 838    },
 839    {
 840       MESA_FORMAT_SIGNED_LA_LATC2,
 841       NULL,
 842       _mesa_fetch_texel_2d_f_signed_la_latc2,
 843       NULL,
 844       NULL
 845    },
 846    {
 847       MESA_FORMAT_SIGNED_A8,
 848       fetch_texel_1d_signed_a8,
 849       fetch_texel_2d_signed_a8,
 850       fetch_texel_3d_signed_a8,
 851       store_texel_signed_a8
 852    },
 853    {
 854       MESA_FORMAT_SIGNED_L8,
 855       fetch_texel_1d_signed_l8,
 856       fetch_texel_2d_signed_l8,
 857       fetch_texel_3d_signed_l8,
 858       store_texel_signed_l8
 859    },
 860    {
 861       MESA_FORMAT_SIGNED_AL88,
 862       fetch_texel_1d_signed_al88,
 863       fetch_texel_2d_signed_al88,
 864       fetch_texel_3d_signed_al88,
 865       store_texel_signed_al88
 866    },
 867    {
 868       MESA_FORMAT_SIGNED_I8,
 869       fetch_texel_1d_signed_i8,
 870       fetch_texel_2d_signed_i8,
 871       fetch_texel_3d_signed_i8,
 872       store_texel_signed_i8
 873    },
 874    {
 875       MESA_FORMAT_SIGNED_A16,
 876       fetch_texel_1d_signed_a16,
 877       fetch_texel_2d_signed_a16,
 878       fetch_texel_3d_signed_a16,
 879       store_texel_signed_a16
 880    },
 881    {
 882       MESA_FORMAT_SIGNED_L16,
 883       fetch_texel_1d_signed_l16,
 884       fetch_texel_2d_signed_l16,
 885       fetch_texel_3d_signed_l16,
 886       store_texel_signed_l16
 887    },
 888    {
 889       MESA_FORMAT_SIGNED_AL1616,
 890       fetch_texel_1d_signed_al1616,
 891       fetch_texel_2d_signed_al1616,
 892       fetch_texel_3d_signed_al1616,
 893       store_texel_signed_al1616
 894    },
 895    {
 896       MESA_FORMAT_SIGNED_I16,
 897       fetch_texel_1d_signed_i16,
 898       fetch_texel_2d_signed_i16,
 899       fetch_texel_3d_signed_i16,
 900       store_texel_signed_i16
 901    },
 902    {
 903       MESA_FORMAT_RGB9_E5_FLOAT,
 904       fetch_texel_1d_rgb9_e5,
 905       fetch_texel_2d_rgb9_e5,
 906       fetch_texel_3d_rgb9_e5,
 907       store_texel_rgb9_e5
 908    },
 909 };
 910
 911
 912 FetchTexelFuncF
 913 _mesa_get_texel_fetch_func(gl_format format, GLuint dims)
 914 {
 915 #ifdef DEBUG
 916    /* check that the table entries are sorted by format name */
 917    gl_format fmt;
 918    for (fmt = 0; fmt < MESA_FORMAT_COUNT; fmt++) {
 919       assert(texfetch_funcs[fmt].Name == fmt);
 920    }
 921 #endif
 922
 923    assert(Elements(texfetch_funcs) == MESA_FORMAT_COUNT);
 924    assert(format < MESA_FORMAT_COUNT);
 925
 926    switch (dims) {
 927    case 1:
 928       return texfetch_funcs[format].Fetch1D;
 929    case 2:
 930       return texfetch_funcs[format].Fetch2D;
 931    case 3:
 932       return texfetch_funcs[format].Fetch3D;
 933    default:
 934       assert(0 && "bad dims in _mesa_get_texel_fetch_func");
 935       return NULL;
 936    }
 937 }
 938
 939
 940 StoreTexelFunc
 941 _mesa_get_texel_store_func(gl_format format)
 942 {
 943    assert(format < MESA_FORMAT_COUNT);
 944    return texfetch_funcs[format].StoreTexel;
 945 }
 946
 947
 948 /**
 949  * Adaptor for fetching a GLchan texel from a float-valued texture.
 950  */
 951 static void
 952 fetch_texel_float_to_chan(const struct gl_texture_image *texImage,
 953                           GLint i, GLint j, GLint k, GLchan *texelOut)
 954 {
 955    GLfloat temp[4];
 956    GLenum baseFormat = _mesa_get_format_base_format(texImage->TexFormat);
 957
 958    ASSERT(texImage->FetchTexelf);
 959    texImage->FetchTexelf(texImage, i, j, k, temp);
 960    if (baseFormat == GL_DEPTH_COMPONENT ||
 961        baseFormat == GL_DEPTH_STENCIL_EXT) {
 962       /* just one channel */
 963       UNCLAMPED_FLOAT_TO_CHAN(texelOut[0], temp[0]);
 964    }
 965    else {
 966       /* four channels */
 967       UNCLAMPED_FLOAT_TO_CHAN(texelOut[0], temp[0]);
 968       UNCLAMPED_FLOAT_TO_CHAN(texelOut[1], temp[1]);
 969       UNCLAMPED_FLOAT_TO_CHAN(texelOut[2], temp[2]);
 970       UNCLAMPED_FLOAT_TO_CHAN(texelOut[3], temp[3]);
 971    }
 972 }
 973
 974
 975 #if 0
 976 /**
 977  * Adaptor for fetching a float texel from a GLchan-valued texture.
 978  */
 979 static void
 980 fetch_texel_chan_to_float(const struct gl_texture_image *texImage,
 981                           GLint i, GLint j, GLint k, GLfloat *texelOut)
 982 {
 983    GLchan temp[4];
 984    GLenum baseFormat = _mesa_get_format_base_format(texImage->TexFormat);
 985
 986    ASSERT(texImage->FetchTexelc);
 987    texImage->FetchTexelc(texImage, i, j, k, temp);
 988    if (baseFormat == GL_DEPTH_COMPONENT ||
 989        baseFormat == GL_DEPTH_STENCIL_EXT) {
 990       /* just one channel */
 991       texelOut[0] = CHAN_TO_FLOAT(temp[0]);
 992    }
 993    else {
 994       /* four channels */
 995       texelOut[0] = CHAN_TO_FLOAT(temp[0]);
 996       texelOut[1] = CHAN_TO_FLOAT(temp[1]);
 997       texelOut[2] = CHAN_TO_FLOAT(temp[2]);
 998       texelOut[3] = CHAN_TO_FLOAT(temp[3]);
 999    }
1000 }
1001 #endif
1002
1003
1004 /**
1005  * Initialize the texture image's FetchTexelc and FetchTexelf methods.
1006  */
1007 void
1008 _mesa_set_fetch_functions(struct gl_texture_image *texImage, GLuint dims)
1009 {
1010    gl_format format = texImage->TexFormat;
1011
1012    ASSERT(dims == 1 || dims == 2 || dims == 3);
1013
1014    if (texImage->TexObject->Sampler.sRGBDecode == GL_SKIP_DECODE_EXT &&
1015        _mesa_get_format_color_encoding(format) == GL_SRGB) {
1016       format = _mesa_get_srgb_format_linear(format);
1017    }
1018
1019    texImage->FetchTexelf = _mesa_get_texel_fetch_func(format, dims);
1020
1021    texImage->FetchTexelc = fetch_texel_float_to_chan;
1022
1023    ASSERT(texImage->FetchTexelc);
1024    ASSERT(texImage->FetchTexelf);
1025 }
1026
1027 void
1028 _mesa_update_fetch_functions(struct gl_texture_object *texObj)
1029 {
1030    GLuint face, i;
1031    GLuint dims;
1032
1033    dims = _mesa_get_texture_dimensions(texObj->Target);
1034
1035    for (face = 0; face < 6; face++) {
1036       for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
1037          if (texObj->Image[face][i]) {
1038             _mesa_set_fetch_functions(texObj->Image[face][i], dims);
1039          }
1040       }
1041    }
1042 }