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_texfetch.h"
  44 #include "../../gallium/auxiliary/util/u_format_rgb9e5.h"
  45 #include "../../gallium/auxiliary/util/u_format_r11g11b10f.h"
  46
  47
  48 /**
  49  * Convert an 8-bit sRGB value from non-linear space to a
  50  * linear RGB value in [0, 1].
  51  * Implemented with a 256-entry lookup table.
  52  */
  53 static INLINE GLfloat
  54 nonlinear_to_linear(GLubyte cs8)
  55 {
  56    static GLfloat table[256];
  57    static GLboolean tableReady = GL_FALSE;
  58    if (!tableReady) {
  59       /* compute lookup table now */
  60       GLuint i;
  61       for (i = 0; i < 256; i++) {
  62          const GLfloat cs = UBYTE_TO_FLOAT(i);
  63          if (cs <= 0.04045) {
  64             table[i] = cs / 12.92f;
  65          }
  66          else {
  67             table[i] = (GLfloat) pow((cs + 0.055) / 1.055, 2.4);
  68          }
  69       }
  70       tableReady = GL_TRUE;
  71    }
  72    return table[cs8];
  73 }
  74
  75
  76
  77 /* Texel fetch routines for all supported formats
  78  */
  79 #define DIM 1
  80 #include "s_texfetch_tmp.h"
  81
  82 #define DIM 2
  83 #include "s_texfetch_tmp.h"
  84
  85 #define DIM 3
  86 #include "s_texfetch_tmp.h"
  87
  88 /**
  89  * Null texel fetch function.
  90  *
  91  * Have to have this so the FetchTexel function pointer is never NULL.
  92  */
  93 static void fetch_null_texelf( const struct gl_texture_image *texImage,
  94                                GLint i, GLint j, GLint k, GLfloat *texel )
  95 {
  96    (void) texImage; (void) i; (void) j; (void) k;
  97    texel[RCOMP] = 0.0;
  98    texel[GCOMP] = 0.0;
  99    texel[BCOMP] = 0.0;
 100    texel[ACOMP] = 0.0;
 101    _mesa_warning(NULL, "fetch_null_texelf() called!");
 102 }
 103
 104 static void store_null_texel(struct gl_texture_image *texImage,
 105                              GLint i, GLint j, GLint k, const void *texel)
 106 {
 107    (void) texImage;
 108    (void) i;
 109    (void) j;
 110    (void) k;
 111    (void) texel;
 112    /* no-op */
 113 }
 114
 115
 116
 117 /**
 118  * Table to map MESA_FORMAT_ to texel fetch/store funcs.
 119  * XXX this is somewhat temporary.
 120  */
 121 static struct {
 122    gl_format Name;
 123    FetchTexelFuncF Fetch1D;
 124    FetchTexelFuncF Fetch2D;
 125    FetchTexelFuncF Fetch3D;
 126    StoreTexelFunc StoreTexel;
 127 }
 128 texfetch_funcs[MESA_FORMAT_COUNT] =
 129 {
 130    {
 131       MESA_FORMAT_NONE,
 132       fetch_null_texelf,
 133       fetch_null_texelf,
 134       fetch_null_texelf,
 135       store_null_texel
 136    },
 137
 138    {
 139       MESA_FORMAT_RGBA8888,
 140       fetch_texel_1d_f_rgba8888,
 141       fetch_texel_2d_f_rgba8888,
 142       fetch_texel_3d_f_rgba8888,
 143       store_texel_rgba8888
 144    },
 145    {
 146       MESA_FORMAT_RGBA8888_REV,
 147       fetch_texel_1d_f_rgba8888_rev,
 148       fetch_texel_2d_f_rgba8888_rev,
 149       fetch_texel_3d_f_rgba8888_rev,
 150       store_texel_rgba8888_rev
 151    },
 152    {
 153       MESA_FORMAT_ARGB8888,
 154       fetch_texel_1d_f_argb8888,
 155       fetch_texel_2d_f_argb8888,
 156       fetch_texel_3d_f_argb8888,
 157       store_texel_argb8888
 158    },
 159    {
 160       MESA_FORMAT_ARGB8888_REV,
 161       fetch_texel_1d_f_argb8888_rev,
 162       fetch_texel_2d_f_argb8888_rev,
 163       fetch_texel_3d_f_argb8888_rev,
 164       store_texel_argb8888_rev
 165    },
 166    {
 167       MESA_FORMAT_XRGB8888,
 168       fetch_texel_1d_f_xrgb8888,
 169       fetch_texel_2d_f_xrgb8888,
 170       fetch_texel_3d_f_xrgb8888,
 171       store_texel_xrgb8888
 172    },
 173    {
 174       MESA_FORMAT_XRGB8888_REV,
 175       fetch_texel_1d_f_xrgb8888_rev,
 176       fetch_texel_2d_f_xrgb8888_rev,
 177       fetch_texel_3d_f_xrgb8888_rev,
 178       store_texel_xrgb8888_rev,
 179    },
 180    {
 181       MESA_FORMAT_RGB888,
 182       fetch_texel_1d_f_rgb888,
 183       fetch_texel_2d_f_rgb888,
 184       fetch_texel_3d_f_rgb888,
 185       store_texel_rgb888
 186    },
 187    {
 188       MESA_FORMAT_BGR888,
 189       fetch_texel_1d_f_bgr888,
 190       fetch_texel_2d_f_bgr888,
 191       fetch_texel_3d_f_bgr888,
 192       store_texel_bgr888
 193    },
 194    {
 195       MESA_FORMAT_RGB565,
 196       fetch_texel_1d_f_rgb565,
 197       fetch_texel_2d_f_rgb565,
 198       fetch_texel_3d_f_rgb565,
 199       store_texel_rgb565
 200    },
 201    {
 202       MESA_FORMAT_RGB565_REV,
 203       fetch_texel_1d_f_rgb565_rev,
 204       fetch_texel_2d_f_rgb565_rev,
 205       fetch_texel_3d_f_rgb565_rev,
 206       store_texel_rgb565_rev
 207    },
 208    {
 209       MESA_FORMAT_ARGB4444,
 210       fetch_texel_1d_f_argb4444,
 211       fetch_texel_2d_f_argb4444,
 212       fetch_texel_3d_f_argb4444,
 213       store_texel_argb4444
 214    },
 215    {
 216       MESA_FORMAT_ARGB4444_REV,
 217       fetch_texel_1d_f_argb4444_rev,
 218       fetch_texel_2d_f_argb4444_rev,
 219       fetch_texel_3d_f_argb4444_rev,
 220       store_texel_argb4444_rev
 221    },
 222    {
 223       MESA_FORMAT_RGBA5551,
 224       fetch_texel_1d_f_rgba5551,
 225       fetch_texel_2d_f_rgba5551,
 226       fetch_texel_3d_f_rgba5551,
 227       store_texel_rgba5551
 228    },
 229    {
 230       MESA_FORMAT_ARGB1555,
 231       fetch_texel_1d_f_argb1555,
 232       fetch_texel_2d_f_argb1555,
 233       fetch_texel_3d_f_argb1555,
 234       store_texel_argb1555
 235    },
 236    {
 237       MESA_FORMAT_ARGB1555_REV,
 238       fetch_texel_1d_f_argb1555_rev,
 239       fetch_texel_2d_f_argb1555_rev,
 240       fetch_texel_3d_f_argb1555_rev,
 241       store_texel_argb1555_rev
 242    },
 243    {
 244       MESA_FORMAT_AL44,
 245       fetch_texel_1d_f_al44,
 246       fetch_texel_2d_f_al44,
 247       fetch_texel_3d_f_al44,
 248       store_texel_al44
 249    },
 250    {
 251       MESA_FORMAT_AL88,
 252       fetch_texel_1d_f_al88,
 253       fetch_texel_2d_f_al88,
 254       fetch_texel_3d_f_al88,
 255       store_texel_al88
 256    },
 257    {
 258       MESA_FORMAT_AL88_REV,
 259       fetch_texel_1d_f_al88_rev,
 260       fetch_texel_2d_f_al88_rev,
 261       fetch_texel_3d_f_al88_rev,
 262       store_texel_al88_rev
 263    },
 264    {
 265       MESA_FORMAT_AL1616,
 266       fetch_texel_1d_f_al1616,
 267       fetch_texel_2d_f_al1616,
 268       fetch_texel_3d_f_al1616,
 269       store_texel_al1616
 270    },
 271    {
 272       MESA_FORMAT_AL1616_REV,
 273       fetch_texel_1d_f_al1616_rev,
 274       fetch_texel_2d_f_al1616_rev,
 275       fetch_texel_3d_f_al1616_rev,
 276       store_texel_al1616_rev
 277    },
 278    {
 279       MESA_FORMAT_RGB332,
 280       fetch_texel_1d_f_rgb332,
 281       fetch_texel_2d_f_rgb332,
 282       fetch_texel_3d_f_rgb332,
 283       store_texel_rgb332
 284    },
 285    {
 286       MESA_FORMAT_A8,
 287       fetch_texel_1d_f_a8,
 288       fetch_texel_2d_f_a8,
 289       fetch_texel_3d_f_a8,
 290       store_texel_a8
 291    },
 292    {
 293       MESA_FORMAT_A16,
 294       fetch_texel_1d_f_a16,
 295       fetch_texel_2d_f_a16,
 296       fetch_texel_3d_f_a16,
 297       store_texel_a16
 298    },
 299    {
 300       MESA_FORMAT_L8,
 301       fetch_texel_1d_f_l8,
 302       fetch_texel_2d_f_l8,
 303       fetch_texel_3d_f_l8,
 304       store_texel_l8
 305    },
 306    {
 307       MESA_FORMAT_L16,
 308       fetch_texel_1d_f_l16,
 309       fetch_texel_2d_f_l16,
 310       fetch_texel_3d_f_l16,
 311       store_texel_l16
 312    },
 313    {
 314       MESA_FORMAT_I8,
 315       fetch_texel_1d_f_i8,
 316       fetch_texel_2d_f_i8,
 317       fetch_texel_3d_f_i8,
 318       store_texel_i8
 319    },
 320    {
 321       MESA_FORMAT_I16,
 322       fetch_texel_1d_f_i16,
 323       fetch_texel_2d_f_i16,
 324       fetch_texel_3d_f_i16,
 325       store_texel_i16
 326    },
 327    {
 328       MESA_FORMAT_YCBCR,
 329       fetch_texel_1d_f_ycbcr,
 330       fetch_texel_2d_f_ycbcr,
 331       fetch_texel_3d_f_ycbcr,
 332       store_texel_ycbcr
 333    },
 334    {
 335       MESA_FORMAT_YCBCR_REV,
 336       fetch_texel_1d_f_ycbcr_rev,
 337       fetch_texel_2d_f_ycbcr_rev,
 338       fetch_texel_3d_f_ycbcr_rev,
 339       store_texel_ycbcr_rev
 340    },
 341    {
 342       MESA_FORMAT_R8,
 343       fetch_texel_1d_f_r8,
 344       fetch_texel_2d_f_r8,
 345       fetch_texel_3d_f_r8,
 346       store_texel_r8,
 347    },
 348    {
 349       MESA_FORMAT_RG88,
 350       fetch_texel_1d_f_rg88,
 351       fetch_texel_2d_f_rg88,
 352       fetch_texel_3d_f_rg88,
 353       store_texel_rg88,
 354    },
 355    {
 356       MESA_FORMAT_RG88_REV,
 357       fetch_texel_1d_f_rg88_rev,
 358       fetch_texel_2d_f_rg88_rev,
 359       fetch_texel_3d_f_rg88_rev,
 360       store_texel_rg88_rev,
 361    },
 362    {
 363       MESA_FORMAT_R16,
 364       fetch_texel_1d_f_r16,
 365       fetch_texel_2d_f_r16,
 366       fetch_texel_3d_f_r16,
 367       store_texel_r16,
 368    },
 369    {
 370       MESA_FORMAT_RG1616,
 371       fetch_texel_1d_f_rg1616,
 372       fetch_texel_2d_f_rg1616,
 373       fetch_texel_3d_f_rg1616,
 374       store_texel_rg1616,
 375    },
 376    {
 377       MESA_FORMAT_RG1616_REV,
 378       fetch_texel_1d_f_rg1616_rev,
 379       fetch_texel_2d_f_rg1616_rev,
 380       fetch_texel_3d_f_rg1616_rev,
 381       store_texel_rg1616_rev,
 382    },
 383    {
 384       MESA_FORMAT_ARGB2101010,
 385       fetch_texel_1d_f_argb2101010,
 386       fetch_texel_2d_f_argb2101010,
 387       fetch_texel_3d_f_argb2101010,
 388       store_texel_argb2101010
 389    },
 390    {
 391       MESA_FORMAT_Z24_S8,
 392       fetch_texel_1d_f_z24_s8,
 393       fetch_texel_2d_f_z24_s8,
 394       fetch_texel_3d_f_z24_s8,
 395       store_texel_z24_s8
 396    },
 397    {
 398       MESA_FORMAT_S8_Z24,
 399       fetch_texel_1d_f_s8_z24,
 400       fetch_texel_2d_f_s8_z24,
 401       fetch_texel_3d_f_s8_z24,
 402       store_texel_s8_z24
 403    },
 404    {
 405       MESA_FORMAT_Z16,
 406       fetch_texel_1d_f_z16,
 407       fetch_texel_2d_f_z16,
 408       fetch_texel_3d_f_z16,
 409       store_texel_z16
 410    },
 411    {
 412       MESA_FORMAT_X8_Z24,
 413       fetch_texel_1d_f_s8_z24,
 414       fetch_texel_2d_f_s8_z24,
 415       fetch_texel_3d_f_s8_z24,
 416       store_texel_s8_z24
 417    },
 418    {
 419       MESA_FORMAT_Z24_X8,
 420       fetch_texel_1d_f_z24_s8,
 421       fetch_texel_2d_f_z24_s8,
 422       fetch_texel_3d_f_z24_s8,
 423       store_texel_z24_s8
 424    },
 425    {
 426       MESA_FORMAT_Z32,
 427       fetch_texel_1d_f_z32,
 428       fetch_texel_2d_f_z32,
 429       fetch_texel_3d_f_z32,
 430       store_texel_z32
 431    },
 432    {
 433       MESA_FORMAT_S8,
 434       NULL,
 435       NULL,
 436       NULL,
 437       NULL
 438    },
 439    {
 440       MESA_FORMAT_SRGB8,
 441       fetch_texel_1d_srgb8,
 442       fetch_texel_2d_srgb8,
 443       fetch_texel_3d_srgb8,
 444       store_texel_srgb8
 445    },
 446    {
 447       MESA_FORMAT_SRGBA8,
 448       fetch_texel_1d_srgba8,
 449       fetch_texel_2d_srgba8,
 450       fetch_texel_3d_srgba8,
 451       store_texel_srgba8
 452    },
 453    {
 454       MESA_FORMAT_SARGB8,
 455       fetch_texel_1d_sargb8,
 456       fetch_texel_2d_sargb8,
 457       fetch_texel_3d_sargb8,
 458       store_texel_sargb8
 459    },
 460    {
 461       MESA_FORMAT_SL8,
 462       fetch_texel_1d_sl8,
 463       fetch_texel_2d_sl8,
 464       fetch_texel_3d_sl8,
 465       store_texel_sl8
 466    },
 467    {
 468       MESA_FORMAT_SLA8,
 469       fetch_texel_1d_sla8,
 470       fetch_texel_2d_sla8,
 471       fetch_texel_3d_sla8,
 472       store_texel_sla8
 473    },
 474    {
 475       MESA_FORMAT_SRGB_DXT1,
 476       NULL,
 477       _mesa_fetch_texel_2d_f_srgb_dxt1,
 478       NULL,
 479       NULL
 480    },
 481    {
 482       MESA_FORMAT_SRGBA_DXT1,
 483       NULL,
 484       _mesa_fetch_texel_2d_f_srgba_dxt1,
 485       NULL,
 486       NULL
 487    },
 488    {
 489       MESA_FORMAT_SRGBA_DXT3,
 490       NULL,
 491       _mesa_fetch_texel_2d_f_srgba_dxt3,
 492       NULL,
 493       NULL
 494    },
 495    {
 496       MESA_FORMAT_SRGBA_DXT5,
 497       NULL,
 498       _mesa_fetch_texel_2d_f_srgba_dxt5,
 499       NULL,
 500       NULL
 501    },
 502
 503    {
 504       MESA_FORMAT_RGB_FXT1,
 505       NULL,
 506       _mesa_fetch_texel_2d_f_rgb_fxt1,
 507       NULL,
 508       NULL
 509    },
 510    {
 511       MESA_FORMAT_RGBA_FXT1,
 512       NULL,
 513       _mesa_fetch_texel_2d_f_rgba_fxt1,
 514       NULL,
 515       NULL
 516    },
 517    {
 518       MESA_FORMAT_RGB_DXT1,
 519       NULL,
 520       _mesa_fetch_texel_2d_f_rgb_dxt1,
 521       NULL,
 522       NULL
 523    },
 524    {
 525       MESA_FORMAT_RGBA_DXT1,
 526       NULL,
 527       _mesa_fetch_texel_2d_f_rgba_dxt1,
 528       NULL,
 529       NULL
 530    },
 531    {
 532       MESA_FORMAT_RGBA_DXT3,
 533       NULL,
 534       _mesa_fetch_texel_2d_f_rgba_dxt3,
 535       NULL,
 536       NULL
 537    },
 538    {
 539       MESA_FORMAT_RGBA_DXT5,
 540       NULL,
 541       _mesa_fetch_texel_2d_f_rgba_dxt5,
 542       NULL,
 543       NULL
 544    },
 545    {
 546       MESA_FORMAT_RGBA_FLOAT32,
 547       fetch_texel_1d_f_rgba_f32,
 548       fetch_texel_2d_f_rgba_f32,
 549       fetch_texel_3d_f_rgba_f32,
 550       store_texel_rgba_f32
 551    },
 552    {
 553       MESA_FORMAT_RGBA_FLOAT16,
 554       fetch_texel_1d_f_rgba_f16,
 555       fetch_texel_2d_f_rgba_f16,
 556       fetch_texel_3d_f_rgba_f16,
 557       store_texel_rgba_f16
 558    },
 559    {
 560       MESA_FORMAT_RGB_FLOAT32,
 561       fetch_texel_1d_f_rgb_f32,
 562       fetch_texel_2d_f_rgb_f32,
 563       fetch_texel_3d_f_rgb_f32,
 564       store_texel_rgb_f32
 565    },
 566    {
 567       MESA_FORMAT_RGB_FLOAT16,
 568       fetch_texel_1d_f_rgb_f16,
 569       fetch_texel_2d_f_rgb_f16,
 570       fetch_texel_3d_f_rgb_f16,
 571       store_texel_rgb_f16
 572    },
 573    {
 574       MESA_FORMAT_ALPHA_FLOAT32,
 575       fetch_texel_1d_f_alpha_f32,
 576       fetch_texel_2d_f_alpha_f32,
 577       fetch_texel_3d_f_alpha_f32,
 578       store_texel_alpha_f32
 579    },
 580    {
 581       MESA_FORMAT_ALPHA_FLOAT16,
 582       fetch_texel_1d_f_alpha_f16,
 583       fetch_texel_2d_f_alpha_f16,
 584       fetch_texel_3d_f_alpha_f16,
 585       store_texel_alpha_f16
 586    },
 587    {
 588       MESA_FORMAT_LUMINANCE_FLOAT32,
 589       fetch_texel_1d_f_luminance_f32,
 590       fetch_texel_2d_f_luminance_f32,
 591       fetch_texel_3d_f_luminance_f32,
 592       store_texel_luminance_f32
 593    },
 594    {
 595       MESA_FORMAT_LUMINANCE_FLOAT16,
 596       fetch_texel_1d_f_luminance_f16,
 597       fetch_texel_2d_f_luminance_f16,
 598       fetch_texel_3d_f_luminance_f16,
 599       store_texel_luminance_f16
 600    },
 601    {
 602       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32,
 603       fetch_texel_1d_f_luminance_alpha_f32,
 604       fetch_texel_2d_f_luminance_alpha_f32,
 605       fetch_texel_3d_f_luminance_alpha_f32,
 606       store_texel_luminance_alpha_f32
 607    },
 608    {
 609       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16,
 610       fetch_texel_1d_f_luminance_alpha_f16,
 611       fetch_texel_2d_f_luminance_alpha_f16,
 612       fetch_texel_3d_f_luminance_alpha_f16,
 613       store_texel_luminance_alpha_f16
 614    },
 615    {
 616       MESA_FORMAT_INTENSITY_FLOAT32,
 617       fetch_texel_1d_f_intensity_f32,
 618       fetch_texel_2d_f_intensity_f32,
 619       fetch_texel_3d_f_intensity_f32,
 620       store_texel_intensity_f32
 621    },
 622    {
 623       MESA_FORMAT_INTENSITY_FLOAT16,
 624       fetch_texel_1d_f_intensity_f16,
 625       fetch_texel_2d_f_intensity_f16,
 626       fetch_texel_3d_f_intensity_f16,
 627       store_texel_intensity_f16
 628    },
 629    {
 630       MESA_FORMAT_R_FLOAT32,
 631       fetch_texel_1d_f_r_f32,
 632       fetch_texel_2d_f_r_f32,
 633       fetch_texel_3d_f_r_f32,
 634       store_texel_r_f32
 635    },
 636    {
 637       MESA_FORMAT_R_FLOAT16,
 638       fetch_texel_1d_f_r_f16,
 639       fetch_texel_2d_f_r_f16,
 640       fetch_texel_3d_f_r_f16,
 641       store_texel_r_f16
 642    },
 643    {
 644       MESA_FORMAT_RG_FLOAT32,
 645       fetch_texel_1d_f_rg_f32,
 646       fetch_texel_2d_f_rg_f32,
 647       fetch_texel_3d_f_rg_f32,
 648       store_texel_rg_f32
 649    },
 650    {
 651       MESA_FORMAT_RG_FLOAT16,
 652       fetch_texel_1d_f_rg_f16,
 653       fetch_texel_2d_f_rg_f16,
 654       fetch_texel_3d_f_rg_f16,
 655       store_texel_rg_f16
 656    },
 657
 658    /* non-normalized, signed int */
 659    {
 660       MESA_FORMAT_RGBA_INT8,
 661       fetch_texel_1d_rgba_int8,
 662       fetch_texel_2d_rgba_int8,
 663       fetch_texel_3d_rgba_int8,
 664       store_texel_rgba_int8
 665    },
 666    {
 667       MESA_FORMAT_RGBA_INT16,
 668       fetch_texel_1d_rgba_int16,
 669       fetch_texel_2d_rgba_int16,
 670       fetch_texel_3d_rgba_int16,
 671       store_texel_rgba_int16
 672    },
 673    {
 674       MESA_FORMAT_RGBA_INT32,
 675       fetch_texel_1d_rgba_int32,
 676       fetch_texel_2d_rgba_int32,
 677       fetch_texel_3d_rgba_int32,
 678       store_texel_rgba_int32
 679    },
 680
 681    /* non-normalized, unsigned int */
 682    {
 683       MESA_FORMAT_RGBA_UINT8,
 684       fetch_texel_1d_rgba_uint8,
 685       fetch_texel_2d_rgba_uint8,
 686       fetch_texel_3d_rgba_uint8,
 687       store_texel_rgba_uint8
 688    },
 689    {
 690       MESA_FORMAT_RGBA_UINT16,
 691       fetch_texel_1d_rgba_uint16,
 692       fetch_texel_2d_rgba_uint16,
 693       fetch_texel_3d_rgba_uint16,
 694       store_texel_rgba_uint16
 695    },
 696    {
 697       MESA_FORMAT_RGBA_UINT32,
 698       fetch_texel_1d_rgba_uint32,
 699       fetch_texel_2d_rgba_uint32,
 700       fetch_texel_3d_rgba_uint32,
 701       store_texel_rgba_uint32
 702    },
 703
 704    /* dudv */
 705    {
 706       MESA_FORMAT_DUDV8,
 707       fetch_texel_1d_dudv8,
 708       fetch_texel_2d_dudv8,
 709       fetch_texel_3d_dudv8,
 710       NULL
 711    },
 712
 713    /* signed, normalized */
 714    {
 715       MESA_FORMAT_SIGNED_R8,
 716       fetch_texel_1d_signed_r8,
 717       fetch_texel_2d_signed_r8,
 718       fetch_texel_3d_signed_r8,
 719       store_texel_signed_r8
 720    },
 721    {
 722       MESA_FORMAT_SIGNED_RG88_REV,
 723       fetch_texel_1d_signed_rg88_rev,
 724       fetch_texel_2d_signed_rg88_rev,
 725       fetch_texel_3d_signed_rg88_rev,
 726       store_texel_signed_rg88_rev
 727    },
 728    {
 729       MESA_FORMAT_SIGNED_RGBX8888,
 730       fetch_texel_1d_signed_rgbx8888,
 731       fetch_texel_2d_signed_rgbx8888,
 732       fetch_texel_3d_signed_rgbx8888,
 733       store_texel_signed_rgbx8888
 734    },
 735    {
 736       MESA_FORMAT_SIGNED_RGBA8888,
 737       fetch_texel_1d_signed_rgba8888,
 738       fetch_texel_2d_signed_rgba8888,
 739       fetch_texel_3d_signed_rgba8888,
 740       store_texel_signed_rgba8888
 741    },
 742    {
 743       MESA_FORMAT_SIGNED_RGBA8888_REV,
 744       fetch_texel_1d_signed_rgba8888_rev,
 745       fetch_texel_2d_signed_rgba8888_rev,
 746       fetch_texel_3d_signed_rgba8888_rev,
 747       store_texel_signed_rgba8888_rev
 748    },
 749    {
 750       MESA_FORMAT_SIGNED_R16,
 751       fetch_texel_1d_signed_r16,
 752       fetch_texel_2d_signed_r16,
 753       fetch_texel_3d_signed_r16,
 754       store_texel_signed_r16
 755    },
 756    {
 757       MESA_FORMAT_SIGNED_GR1616,
 758       fetch_texel_1d_signed_rg1616,
 759       fetch_texel_2d_signed_rg1616,
 760       fetch_texel_3d_signed_rg1616,
 761       store_texel_signed_rg1616
 762    },
 763    {
 764       MESA_FORMAT_SIGNED_RGB_16,
 765       fetch_texel_1d_signed_rgb_16,
 766       fetch_texel_2d_signed_rgb_16,
 767       fetch_texel_3d_signed_rgb_16,
 768       store_texel_signed_rgb_16
 769    },
 770    {
 771       MESA_FORMAT_SIGNED_RGBA_16,
 772       fetch_texel_1d_signed_rgba_16,
 773       fetch_texel_2d_signed_rgba_16,
 774       fetch_texel_3d_signed_rgba_16,
 775       store_texel_signed_rgba_16
 776    },
 777    {
 778       MESA_FORMAT_RGBA_16,
 779       fetch_texel_1d_rgba_16,
 780       fetch_texel_2d_rgba_16,
 781       fetch_texel_3d_rgba_16,
 782       store_texel_rgba_16
 783    },
 784    {
 785       MESA_FORMAT_RED_RGTC1,
 786       NULL,
 787       _mesa_fetch_texel_2d_f_red_rgtc1,
 788       NULL,
 789       NULL
 790    },
 791    {
 792       MESA_FORMAT_SIGNED_RED_RGTC1,
 793       NULL,
 794       _mesa_fetch_texel_2d_f_signed_red_rgtc1,
 795       NULL,
 796       NULL
 797    },
 798    {
 799       MESA_FORMAT_RG_RGTC2,
 800       NULL,
 801       _mesa_fetch_texel_2d_f_rg_rgtc2,
 802       NULL,
 803       NULL
 804    },
 805    {
 806       MESA_FORMAT_SIGNED_RG_RGTC2,
 807       NULL,
 808       _mesa_fetch_texel_2d_f_signed_rg_rgtc2,
 809       NULL,
 810       NULL
 811    },
 812    {
 813       MESA_FORMAT_L_LATC1,
 814       NULL,
 815       _mesa_fetch_texel_2d_f_l_latc1,
 816       NULL,
 817       NULL
 818    },
 819    {
 820       MESA_FORMAT_SIGNED_L_LATC1,
 821       NULL,
 822       _mesa_fetch_texel_2d_f_signed_l_latc1,
 823       NULL,
 824       NULL
 825    },
 826    {
 827       MESA_FORMAT_LA_LATC2,
 828       NULL,
 829       _mesa_fetch_texel_2d_f_la_latc2,
 830       NULL,
 831       NULL
 832    },
 833    {
 834       MESA_FORMAT_SIGNED_LA_LATC2,
 835       NULL,
 836       _mesa_fetch_texel_2d_f_signed_la_latc2,
 837       NULL,
 838       NULL
 839    },
 840    {
 841       MESA_FORMAT_SIGNED_A8,
 842       fetch_texel_1d_signed_a8,
 843       fetch_texel_2d_signed_a8,
 844       fetch_texel_3d_signed_a8,
 845       store_texel_signed_a8
 846    },
 847    {
 848       MESA_FORMAT_SIGNED_L8,
 849       fetch_texel_1d_signed_l8,
 850       fetch_texel_2d_signed_l8,
 851       fetch_texel_3d_signed_l8,
 852       store_texel_signed_l8
 853    },
 854    {
 855       MESA_FORMAT_SIGNED_AL88,
 856       fetch_texel_1d_signed_al88,
 857       fetch_texel_2d_signed_al88,
 858       fetch_texel_3d_signed_al88,
 859       store_texel_signed_al88
 860    },
 861    {
 862       MESA_FORMAT_SIGNED_I8,
 863       fetch_texel_1d_signed_i8,
 864       fetch_texel_2d_signed_i8,
 865       fetch_texel_3d_signed_i8,
 866       store_texel_signed_i8
 867    },
 868    {
 869       MESA_FORMAT_SIGNED_A16,
 870       fetch_texel_1d_signed_a16,
 871       fetch_texel_2d_signed_a16,
 872       fetch_texel_3d_signed_a16,
 873       store_texel_signed_a16
 874    },
 875    {
 876       MESA_FORMAT_SIGNED_L16,
 877       fetch_texel_1d_signed_l16,
 878       fetch_texel_2d_signed_l16,
 879       fetch_texel_3d_signed_l16,
 880       store_texel_signed_l16
 881    },
 882    {
 883       MESA_FORMAT_SIGNED_AL1616,
 884       fetch_texel_1d_signed_al1616,
 885       fetch_texel_2d_signed_al1616,
 886       fetch_texel_3d_signed_al1616,
 887       store_texel_signed_al1616
 888    },
 889    {
 890       MESA_FORMAT_SIGNED_I16,
 891       fetch_texel_1d_signed_i16,
 892       fetch_texel_2d_signed_i16,
 893       fetch_texel_3d_signed_i16,
 894       store_texel_signed_i16
 895    },
 896    {
 897       MESA_FORMAT_RGB9_E5_FLOAT,
 898       fetch_texel_1d_rgb9_e5,
 899       fetch_texel_2d_rgb9_e5,
 900       fetch_texel_3d_rgb9_e5,
 901       store_texel_rgb9_e5
 902    },
 903    {
 904       MESA_FORMAT_R11_G11_B10_FLOAT,
 905       fetch_texel_1d_r11_g11_b10f,
 906       fetch_texel_2d_r11_g11_b10f,
 907       fetch_texel_3d_r11_g11_b10f,
 908       store_texel_r11_g11_b10f
 909    },
 910    {
 911       MESA_FORMAT_Z32_FLOAT,
 912       fetch_texel_1d_f_r_f32, /* Reuse the R32F functions. */
 913       fetch_texel_2d_f_r_f32,
 914       fetch_texel_3d_f_r_f32,
 915       store_texel_r_f32
 916    },
 917    {
 918       MESA_FORMAT_Z32_FLOAT_X24S8,
 919       fetch_texel_1d_z32f_x24s8,
 920       fetch_texel_2d_z32f_x24s8,
 921       fetch_texel_3d_z32f_x24s8,
 922       store_texel_z32f_x24s8
 923    }
 924 };
 925
 926
 927 FetchTexelFuncF
 928 _mesa_get_texel_fetch_func(gl_format format, GLuint dims)
 929 {
 930 #ifdef DEBUG
 931    /* check that the table entries are sorted by format name */
 932    gl_format fmt;
 933    for (fmt = 0; fmt < MESA_FORMAT_COUNT; fmt++) {
 934       assert(texfetch_funcs[fmt].Name == fmt);
 935    }
 936 #endif
 937
 938    assert(Elements(texfetch_funcs) == MESA_FORMAT_COUNT);
 939    assert(format < MESA_FORMAT_COUNT);
 940
 941    switch (dims) {
 942    case 1:
 943       return texfetch_funcs[format].Fetch1D;
 944    case 2:
 945       return texfetch_funcs[format].Fetch2D;
 946    case 3:
 947       return texfetch_funcs[format].Fetch3D;
 948    default:
 949       assert(0 && "bad dims in _mesa_get_texel_fetch_func");
 950       return NULL;
 951    }
 952 }
 953
 954
 955 StoreTexelFunc
 956 _mesa_get_texel_store_func(gl_format format)
 957 {
 958    assert(format < MESA_FORMAT_COUNT);
 959    return texfetch_funcs[format].StoreTexel;
 960 }
 961
 962
 963 /**
 964  * Adaptor for fetching a GLchan texel from a float-valued texture.
 965  */
 966 static void
 967 fetch_texel_float_to_chan(const struct gl_texture_image *texImage,
 968                           GLint i, GLint j, GLint k, GLchan *texelOut)
 969 {
 970    GLfloat temp[4];
 971    GLenum baseFormat = _mesa_get_format_base_format(texImage->TexFormat);
 972
 973    ASSERT(texImage->FetchTexelf);
 974    texImage->FetchTexelf(texImage, i, j, k, temp);
 975    if (baseFormat == GL_DEPTH_COMPONENT ||
 976        baseFormat == GL_DEPTH_STENCIL_EXT) {
 977       /* just one channel */
 978       UNCLAMPED_FLOAT_TO_CHAN(texelOut[0], temp[0]);
 979    }
 980    else {
 981       /* four channels */
 982       UNCLAMPED_FLOAT_TO_CHAN(texelOut[0], temp[0]);
 983       UNCLAMPED_FLOAT_TO_CHAN(texelOut[1], temp[1]);
 984       UNCLAMPED_FLOAT_TO_CHAN(texelOut[2], temp[2]);
 985       UNCLAMPED_FLOAT_TO_CHAN(texelOut[3], temp[3]);
 986    }
 987 }
 988
 989
 990 #if 0
 991 /**
 992  * Adaptor for fetching a float texel from a GLchan-valued texture.
 993  */
 994 static void
 995 fetch_texel_chan_to_float(const struct gl_texture_image *texImage,
 996                           GLint i, GLint j, GLint k, GLfloat *texelOut)
 997 {
 998    GLchan temp[4];
 999    GLenum baseFormat = _mesa_get_format_base_format(texImage->TexFormat);
1000
1001    ASSERT(texImage->FetchTexelc);
1002    texImage->FetchTexelc(texImage, i, j, k, temp);
1003    if (baseFormat == GL_DEPTH_COMPONENT ||
1004        baseFormat == GL_DEPTH_STENCIL_EXT) {
1005       /* just one channel */
1006       texelOut[0] = CHAN_TO_FLOAT(temp[0]);
1007    }
1008    else {
1009       /* four channels */
1010       texelOut[0] = CHAN_TO_FLOAT(temp[0]);
1011       texelOut[1] = CHAN_TO_FLOAT(temp[1]);
1012       texelOut[2] = CHAN_TO_FLOAT(temp[2]);
1013       texelOut[3] = CHAN_TO_FLOAT(temp[3]);
1014    }
1015 }
1016 #endif
1017
1018
1019 /**
1020  * Initialize the texture image's FetchTexelc and FetchTexelf methods.
1021  */
1022 void
1023 _mesa_set_fetch_functions(struct gl_texture_image *texImage, GLuint dims)
1024 {
1025    gl_format format = texImage->TexFormat;
1026
1027    ASSERT(dims == 1 || dims == 2 || dims == 3);
1028
1029    if (texImage->TexObject->Sampler.sRGBDecode == GL_SKIP_DECODE_EXT &&
1030        _mesa_get_format_color_encoding(format) == GL_SRGB) {
1031       format = _mesa_get_srgb_format_linear(format);
1032    }
1033
1034    texImage->FetchTexelf = _mesa_get_texel_fetch_func(format, dims);
1035
1036    texImage->FetchTexelc = fetch_texel_float_to_chan;
1037
1038    ASSERT(texImage->FetchTexelc);
1039    ASSERT(texImage->FetchTexelf);
1040 }
1041
1042 void
1043 _mesa_update_fetch_functions(struct gl_texture_object *texObj)
1044 {
1045    GLuint face, i;
1046    GLuint dims;
1047
1048    dims = _mesa_get_texture_dimensions(texObj->Target);
1049
1050    for (face = 0; face < 6; face++) {
1051       for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
1052          if (texObj->Image[face][i]) {
1053             _mesa_set_fetch_functions(texObj->Image[face][i], dims);
1054          }
1055       }
1056    }
1057 }