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    FetchTexelFuncF Fetch1D;
 125    FetchTexelFuncF Fetch2D;
 126    FetchTexelFuncF 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_XRGB8888,
 169       fetch_texel_1d_f_xrgb8888,
 170       fetch_texel_2d_f_xrgb8888,
 171       fetch_texel_3d_f_xrgb8888,
 172       store_texel_xrgb8888
 173    },
 174    {
 175       MESA_FORMAT_XRGB8888_REV,
 176       fetch_texel_1d_f_xrgb8888_rev,
 177       fetch_texel_2d_f_xrgb8888_rev,
 178       fetch_texel_3d_f_xrgb8888_rev,
 179       store_texel_xrgb8888_rev,
 180    },
 181    {
 182       MESA_FORMAT_RGB888,
 183       fetch_texel_1d_f_rgb888,
 184       fetch_texel_2d_f_rgb888,
 185       fetch_texel_3d_f_rgb888,
 186       store_texel_rgb888
 187    },
 188    {
 189       MESA_FORMAT_BGR888,
 190       fetch_texel_1d_f_bgr888,
 191       fetch_texel_2d_f_bgr888,
 192       fetch_texel_3d_f_bgr888,
 193       store_texel_bgr888
 194    },
 195    {
 196       MESA_FORMAT_RGB565,
 197       fetch_texel_1d_f_rgb565,
 198       fetch_texel_2d_f_rgb565,
 199       fetch_texel_3d_f_rgb565,
 200       store_texel_rgb565
 201    },
 202    {
 203       MESA_FORMAT_RGB565_REV,
 204       fetch_texel_1d_f_rgb565_rev,
 205       fetch_texel_2d_f_rgb565_rev,
 206       fetch_texel_3d_f_rgb565_rev,
 207       store_texel_rgb565_rev
 208    },
 209    {
 210       MESA_FORMAT_ARGB4444,
 211       fetch_texel_1d_f_argb4444,
 212       fetch_texel_2d_f_argb4444,
 213       fetch_texel_3d_f_argb4444,
 214       store_texel_argb4444
 215    },
 216    {
 217       MESA_FORMAT_ARGB4444_REV,
 218       fetch_texel_1d_f_argb4444_rev,
 219       fetch_texel_2d_f_argb4444_rev,
 220       fetch_texel_3d_f_argb4444_rev,
 221       store_texel_argb4444_rev
 222    },
 223    {
 224       MESA_FORMAT_RGBA5551,
 225       fetch_texel_1d_f_rgba5551,
 226       fetch_texel_2d_f_rgba5551,
 227       fetch_texel_3d_f_rgba5551,
 228       store_texel_rgba5551
 229    },
 230    {
 231       MESA_FORMAT_ARGB1555,
 232       fetch_texel_1d_f_argb1555,
 233       fetch_texel_2d_f_argb1555,
 234       fetch_texel_3d_f_argb1555,
 235       store_texel_argb1555
 236    },
 237    {
 238       MESA_FORMAT_ARGB1555_REV,
 239       fetch_texel_1d_f_argb1555_rev,
 240       fetch_texel_2d_f_argb1555_rev,
 241       fetch_texel_3d_f_argb1555_rev,
 242       store_texel_argb1555_rev
 243    },
 244    {
 245       MESA_FORMAT_AL44,
 246       fetch_texel_1d_f_al44,
 247       fetch_texel_2d_f_al44,
 248       fetch_texel_3d_f_al44,
 249       store_texel_al44
 250    },
 251    {
 252       MESA_FORMAT_AL88,
 253       fetch_texel_1d_f_al88,
 254       fetch_texel_2d_f_al88,
 255       fetch_texel_3d_f_al88,
 256       store_texel_al88
 257    },
 258    {
 259       MESA_FORMAT_AL88_REV,
 260       fetch_texel_1d_f_al88_rev,
 261       fetch_texel_2d_f_al88_rev,
 262       fetch_texel_3d_f_al88_rev,
 263       store_texel_al88_rev
 264    },
 265    {
 266       MESA_FORMAT_AL1616,
 267       fetch_texel_1d_f_al1616,
 268       fetch_texel_2d_f_al1616,
 269       fetch_texel_3d_f_al1616,
 270       store_texel_al1616
 271    },
 272    {
 273       MESA_FORMAT_AL1616_REV,
 274       fetch_texel_1d_f_al1616_rev,
 275       fetch_texel_2d_f_al1616_rev,
 276       fetch_texel_3d_f_al1616_rev,
 277       store_texel_al1616_rev
 278    },
 279    {
 280       MESA_FORMAT_RGB332,
 281       fetch_texel_1d_f_rgb332,
 282       fetch_texel_2d_f_rgb332,
 283       fetch_texel_3d_f_rgb332,
 284       store_texel_rgb332
 285    },
 286    {
 287       MESA_FORMAT_A8,
 288       fetch_texel_1d_f_a8,
 289       fetch_texel_2d_f_a8,
 290       fetch_texel_3d_f_a8,
 291       store_texel_a8
 292    },
 293    {
 294       MESA_FORMAT_A16,
 295       fetch_texel_1d_f_a16,
 296       fetch_texel_2d_f_a16,
 297       fetch_texel_3d_f_a16,
 298       store_texel_a16
 299    },
 300    {
 301       MESA_FORMAT_L8,
 302       fetch_texel_1d_f_l8,
 303       fetch_texel_2d_f_l8,
 304       fetch_texel_3d_f_l8,
 305       store_texel_l8
 306    },
 307    {
 308       MESA_FORMAT_L16,
 309       fetch_texel_1d_f_l16,
 310       fetch_texel_2d_f_l16,
 311       fetch_texel_3d_f_l16,
 312       store_texel_l16
 313    },
 314    {
 315       MESA_FORMAT_I8,
 316       fetch_texel_1d_f_i8,
 317       fetch_texel_2d_f_i8,
 318       fetch_texel_3d_f_i8,
 319       store_texel_i8
 320    },
 321    {
 322       MESA_FORMAT_I16,
 323       fetch_texel_1d_f_i16,
 324       fetch_texel_2d_f_i16,
 325       fetch_texel_3d_f_i16,
 326       store_texel_i16
 327    },
 328    {
 329       MESA_FORMAT_YCBCR,
 330       fetch_texel_1d_f_ycbcr,
 331       fetch_texel_2d_f_ycbcr,
 332       fetch_texel_3d_f_ycbcr,
 333       store_texel_ycbcr
 334    },
 335    {
 336       MESA_FORMAT_YCBCR_REV,
 337       fetch_texel_1d_f_ycbcr_rev,
 338       fetch_texel_2d_f_ycbcr_rev,
 339       fetch_texel_3d_f_ycbcr_rev,
 340       store_texel_ycbcr_rev
 341    },
 342    {
 343       MESA_FORMAT_R8,
 344       fetch_texel_1d_f_r8,
 345       fetch_texel_2d_f_r8,
 346       fetch_texel_3d_f_r8,
 347       store_texel_r8,
 348    },
 349    {
 350       MESA_FORMAT_RG88,
 351       fetch_texel_1d_f_rg88,
 352       fetch_texel_2d_f_rg88,
 353       fetch_texel_3d_f_rg88,
 354       store_texel_rg88,
 355    },
 356    {
 357       MESA_FORMAT_RG88_REV,
 358       fetch_texel_1d_f_rg88_rev,
 359       fetch_texel_2d_f_rg88_rev,
 360       fetch_texel_3d_f_rg88_rev,
 361       store_texel_rg88_rev,
 362    },
 363    {
 364       MESA_FORMAT_R16,
 365       fetch_texel_1d_f_r16,
 366       fetch_texel_2d_f_r16,
 367       fetch_texel_3d_f_r16,
 368       store_texel_r16,
 369    },
 370    {
 371       MESA_FORMAT_RG1616,
 372       fetch_texel_1d_f_rg1616,
 373       fetch_texel_2d_f_rg1616,
 374       fetch_texel_3d_f_rg1616,
 375       store_texel_rg1616,
 376    },
 377    {
 378       MESA_FORMAT_RG1616_REV,
 379       fetch_texel_1d_f_rg1616_rev,
 380       fetch_texel_2d_f_rg1616_rev,
 381       fetch_texel_3d_f_rg1616_rev,
 382       store_texel_rg1616_rev,
 383    },
 384    {
 385       MESA_FORMAT_ARGB2101010,
 386       fetch_texel_1d_f_argb2101010,
 387       fetch_texel_2d_f_argb2101010,
 388       fetch_texel_3d_f_argb2101010,
 389       store_texel_argb2101010
 390    },
 391    {
 392       MESA_FORMAT_Z24_S8,
 393       fetch_texel_1d_f_z24_s8,
 394       fetch_texel_2d_f_z24_s8,
 395       fetch_texel_3d_f_z24_s8,
 396       store_texel_z24_s8
 397    },
 398    {
 399       MESA_FORMAT_S8_Z24,
 400       fetch_texel_1d_f_s8_z24,
 401       fetch_texel_2d_f_s8_z24,
 402       fetch_texel_3d_f_s8_z24,
 403       store_texel_s8_z24
 404    },
 405    {
 406       MESA_FORMAT_Z16,
 407       fetch_texel_1d_f_z16,
 408       fetch_texel_2d_f_z16,
 409       fetch_texel_3d_f_z16,
 410       store_texel_z16
 411    },
 412    {
 413       MESA_FORMAT_X8_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_Z24_X8,
 421       fetch_texel_1d_f_z24_s8,
 422       fetch_texel_2d_f_z24_s8,
 423       fetch_texel_3d_f_z24_s8,
 424       store_texel_z24_s8
 425    },
 426    {
 427       MESA_FORMAT_Z32,
 428       fetch_texel_1d_f_z32,
 429       fetch_texel_2d_f_z32,
 430       fetch_texel_3d_f_z32,
 431       store_texel_z32
 432    },
 433    {
 434       MESA_FORMAT_S8,
 435       NULL,
 436       NULL,
 437       NULL,
 438       NULL
 439    },
 440    {
 441       MESA_FORMAT_SRGB8,
 442       fetch_texel_1d_srgb8,
 443       fetch_texel_2d_srgb8,
 444       fetch_texel_3d_srgb8,
 445       store_texel_srgb8
 446    },
 447    {
 448       MESA_FORMAT_SRGBA8,
 449       fetch_texel_1d_srgba8,
 450       fetch_texel_2d_srgba8,
 451       fetch_texel_3d_srgba8,
 452       store_texel_srgba8
 453    },
 454    {
 455       MESA_FORMAT_SARGB8,
 456       fetch_texel_1d_sargb8,
 457       fetch_texel_2d_sargb8,
 458       fetch_texel_3d_sargb8,
 459       store_texel_sargb8
 460    },
 461    {
 462       MESA_FORMAT_SL8,
 463       fetch_texel_1d_sl8,
 464       fetch_texel_2d_sl8,
 465       fetch_texel_3d_sl8,
 466       store_texel_sl8
 467    },
 468    {
 469       MESA_FORMAT_SLA8,
 470       fetch_texel_1d_sla8,
 471       fetch_texel_2d_sla8,
 472       fetch_texel_3d_sla8,
 473       store_texel_sla8
 474    },
 475    {
 476       MESA_FORMAT_SRGB_DXT1,
 477       NULL,
 478       _mesa_fetch_texel_2d_f_srgb_dxt1,
 479       NULL,
 480       NULL
 481    },
 482    {
 483       MESA_FORMAT_SRGBA_DXT1,
 484       NULL,
 485       _mesa_fetch_texel_2d_f_srgba_dxt1,
 486       NULL,
 487       NULL
 488    },
 489    {
 490       MESA_FORMAT_SRGBA_DXT3,
 491       NULL,
 492       _mesa_fetch_texel_2d_f_srgba_dxt3,
 493       NULL,
 494       NULL
 495    },
 496    {
 497       MESA_FORMAT_SRGBA_DXT5,
 498       NULL,
 499       _mesa_fetch_texel_2d_f_srgba_dxt5,
 500       NULL,
 501       NULL
 502    },
 503
 504    {
 505       MESA_FORMAT_RGB_FXT1,
 506       NULL,
 507       _mesa_fetch_texel_2d_f_rgb_fxt1,
 508       NULL,
 509       NULL
 510    },
 511    {
 512       MESA_FORMAT_RGBA_FXT1,
 513       NULL,
 514       _mesa_fetch_texel_2d_f_rgba_fxt1,
 515       NULL,
 516       NULL
 517    },
 518    {
 519       MESA_FORMAT_RGB_DXT1,
 520       NULL,
 521       _mesa_fetch_texel_2d_f_rgb_dxt1,
 522       NULL,
 523       NULL
 524    },
 525    {
 526       MESA_FORMAT_RGBA_DXT1,
 527       NULL,
 528       _mesa_fetch_texel_2d_f_rgba_dxt1,
 529       NULL,
 530       NULL
 531    },
 532    {
 533       MESA_FORMAT_RGBA_DXT3,
 534       NULL,
 535       _mesa_fetch_texel_2d_f_rgba_dxt3,
 536       NULL,
 537       NULL
 538    },
 539    {
 540       MESA_FORMAT_RGBA_DXT5,
 541       NULL,
 542       _mesa_fetch_texel_2d_f_rgba_dxt5,
 543       NULL,
 544       NULL
 545    },
 546    {
 547       MESA_FORMAT_RGBA_FLOAT32,
 548       fetch_texel_1d_f_rgba_f32,
 549       fetch_texel_2d_f_rgba_f32,
 550       fetch_texel_3d_f_rgba_f32,
 551       store_texel_rgba_f32
 552    },
 553    {
 554       MESA_FORMAT_RGBA_FLOAT16,
 555       fetch_texel_1d_f_rgba_f16,
 556       fetch_texel_2d_f_rgba_f16,
 557       fetch_texel_3d_f_rgba_f16,
 558       store_texel_rgba_f16
 559    },
 560    {
 561       MESA_FORMAT_RGB_FLOAT32,
 562       fetch_texel_1d_f_rgb_f32,
 563       fetch_texel_2d_f_rgb_f32,
 564       fetch_texel_3d_f_rgb_f32,
 565       store_texel_rgb_f32
 566    },
 567    {
 568       MESA_FORMAT_RGB_FLOAT16,
 569       fetch_texel_1d_f_rgb_f16,
 570       fetch_texel_2d_f_rgb_f16,
 571       fetch_texel_3d_f_rgb_f16,
 572       store_texel_rgb_f16
 573    },
 574    {
 575       MESA_FORMAT_ALPHA_FLOAT32,
 576       fetch_texel_1d_f_alpha_f32,
 577       fetch_texel_2d_f_alpha_f32,
 578       fetch_texel_3d_f_alpha_f32,
 579       store_texel_alpha_f32
 580    },
 581    {
 582       MESA_FORMAT_ALPHA_FLOAT16,
 583       fetch_texel_1d_f_alpha_f16,
 584       fetch_texel_2d_f_alpha_f16,
 585       fetch_texel_3d_f_alpha_f16,
 586       store_texel_alpha_f16
 587    },
 588    {
 589       MESA_FORMAT_LUMINANCE_FLOAT32,
 590       fetch_texel_1d_f_luminance_f32,
 591       fetch_texel_2d_f_luminance_f32,
 592       fetch_texel_3d_f_luminance_f32,
 593       store_texel_luminance_f32
 594    },
 595    {
 596       MESA_FORMAT_LUMINANCE_FLOAT16,
 597       fetch_texel_1d_f_luminance_f16,
 598       fetch_texel_2d_f_luminance_f16,
 599       fetch_texel_3d_f_luminance_f16,
 600       store_texel_luminance_f16
 601    },
 602    {
 603       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32,
 604       fetch_texel_1d_f_luminance_alpha_f32,
 605       fetch_texel_2d_f_luminance_alpha_f32,
 606       fetch_texel_3d_f_luminance_alpha_f32,
 607       store_texel_luminance_alpha_f32
 608    },
 609    {
 610       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16,
 611       fetch_texel_1d_f_luminance_alpha_f16,
 612       fetch_texel_2d_f_luminance_alpha_f16,
 613       fetch_texel_3d_f_luminance_alpha_f16,
 614       store_texel_luminance_alpha_f16
 615    },
 616    {
 617       MESA_FORMAT_INTENSITY_FLOAT32,
 618       fetch_texel_1d_f_intensity_f32,
 619       fetch_texel_2d_f_intensity_f32,
 620       fetch_texel_3d_f_intensity_f32,
 621       store_texel_intensity_f32
 622    },
 623    {
 624       MESA_FORMAT_INTENSITY_FLOAT16,
 625       fetch_texel_1d_f_intensity_f16,
 626       fetch_texel_2d_f_intensity_f16,
 627       fetch_texel_3d_f_intensity_f16,
 628       store_texel_intensity_f16
 629    },
 630    {
 631       MESA_FORMAT_R_FLOAT32,
 632       fetch_texel_1d_f_r_f32,
 633       fetch_texel_2d_f_r_f32,
 634       fetch_texel_3d_f_r_f32,
 635       store_texel_r_f32
 636    },
 637    {
 638       MESA_FORMAT_R_FLOAT16,
 639       fetch_texel_1d_f_r_f16,
 640       fetch_texel_2d_f_r_f16,
 641       fetch_texel_3d_f_r_f16,
 642       store_texel_r_f16
 643    },
 644    {
 645       MESA_FORMAT_RG_FLOAT32,
 646       fetch_texel_1d_f_rg_f32,
 647       fetch_texel_2d_f_rg_f32,
 648       fetch_texel_3d_f_rg_f32,
 649       store_texel_rg_f32
 650    },
 651    {
 652       MESA_FORMAT_RG_FLOAT16,
 653       fetch_texel_1d_f_rg_f16,
 654       fetch_texel_2d_f_rg_f16,
 655       fetch_texel_3d_f_rg_f16,
 656       store_texel_rg_f16
 657    },
 658
 659    /* non-normalized, signed int */
 660    {
 661       MESA_FORMAT_RGBA_INT8,
 662       fetch_texel_1d_rgba_int8,
 663       fetch_texel_2d_rgba_int8,
 664       fetch_texel_3d_rgba_int8,
 665       store_texel_rgba_int8
 666    },
 667    {
 668       MESA_FORMAT_RGBA_INT16,
 669       fetch_texel_1d_rgba_int16,
 670       fetch_texel_2d_rgba_int16,
 671       fetch_texel_3d_rgba_int16,
 672       store_texel_rgba_int16
 673    },
 674    {
 675       MESA_FORMAT_RGBA_INT32,
 676       fetch_texel_1d_rgba_int32,
 677       fetch_texel_2d_rgba_int32,
 678       fetch_texel_3d_rgba_int32,
 679       store_texel_rgba_int32
 680    },
 681
 682    /* non-normalized, unsigned int */
 683    {
 684       MESA_FORMAT_RGBA_UINT8,
 685       fetch_texel_1d_rgba_uint8,
 686       fetch_texel_2d_rgba_uint8,
 687       fetch_texel_3d_rgba_uint8,
 688       store_texel_rgba_uint8
 689    },
 690    {
 691       MESA_FORMAT_RGBA_UINT16,
 692       fetch_texel_1d_rgba_uint16,
 693       fetch_texel_2d_rgba_uint16,
 694       fetch_texel_3d_rgba_uint16,
 695       store_texel_rgba_uint16
 696    },
 697    {
 698       MESA_FORMAT_RGBA_UINT32,
 699       fetch_texel_1d_rgba_uint32,
 700       fetch_texel_2d_rgba_uint32,
 701       fetch_texel_3d_rgba_uint32,
 702       store_texel_rgba_uint32
 703    },
 704
 705    /* dudv */
 706    {
 707       MESA_FORMAT_DUDV8,
 708       fetch_texel_1d_dudv8,
 709       fetch_texel_2d_dudv8,
 710       fetch_texel_3d_dudv8,
 711       NULL
 712    },
 713
 714    /* signed, normalized */
 715    {
 716       MESA_FORMAT_SIGNED_R8,
 717       fetch_texel_1d_signed_r8,
 718       fetch_texel_2d_signed_r8,
 719       fetch_texel_3d_signed_r8,
 720       store_texel_signed_r8
 721    },
 722    {
 723       MESA_FORMAT_SIGNED_RG88_REV,
 724       fetch_texel_1d_signed_rg88_rev,
 725       fetch_texel_2d_signed_rg88_rev,
 726       fetch_texel_3d_signed_rg88_rev,
 727       store_texel_signed_rg88_rev
 728    },
 729    {
 730       MESA_FORMAT_SIGNED_RGBX8888,
 731       fetch_texel_1d_signed_rgbx8888,
 732       fetch_texel_2d_signed_rgbx8888,
 733       fetch_texel_3d_signed_rgbx8888,
 734       store_texel_signed_rgbx8888
 735    },
 736    {
 737       MESA_FORMAT_SIGNED_RGBA8888,
 738       fetch_texel_1d_signed_rgba8888,
 739       fetch_texel_2d_signed_rgba8888,
 740       fetch_texel_3d_signed_rgba8888,
 741       store_texel_signed_rgba8888
 742    },
 743    {
 744       MESA_FORMAT_SIGNED_RGBA8888_REV,
 745       fetch_texel_1d_signed_rgba8888_rev,
 746       fetch_texel_2d_signed_rgba8888_rev,
 747       fetch_texel_3d_signed_rgba8888_rev,
 748       store_texel_signed_rgba8888_rev
 749    },
 750    {
 751       MESA_FORMAT_SIGNED_R16,
 752       fetch_texel_1d_signed_r16,
 753       fetch_texel_2d_signed_r16,
 754       fetch_texel_3d_signed_r16,
 755       store_texel_signed_r16
 756    },
 757    {
 758       MESA_FORMAT_SIGNED_GR1616,
 759       fetch_texel_1d_signed_rg1616,
 760       fetch_texel_2d_signed_rg1616,
 761       fetch_texel_3d_signed_rg1616,
 762       store_texel_signed_rg1616
 763    },
 764    {
 765       MESA_FORMAT_SIGNED_RGB_16,
 766       fetch_texel_1d_signed_rgb_16,
 767       fetch_texel_2d_signed_rgb_16,
 768       fetch_texel_3d_signed_rgb_16,
 769       store_texel_signed_rgb_16
 770    },
 771    {
 772       MESA_FORMAT_SIGNED_RGBA_16,
 773       fetch_texel_1d_signed_rgba_16,
 774       fetch_texel_2d_signed_rgba_16,
 775       fetch_texel_3d_signed_rgba_16,
 776       store_texel_signed_rgba_16
 777    },
 778    {
 779       MESA_FORMAT_RGBA_16,
 780       fetch_texel_1d_rgba_16,
 781       fetch_texel_2d_rgba_16,
 782       fetch_texel_3d_rgba_16,
 783       store_texel_rgba_16
 784    },
 785    {
 786       MESA_FORMAT_RED_RGTC1,
 787       NULL,
 788       _mesa_fetch_texel_2d_f_red_rgtc1,
 789       NULL,
 790       NULL
 791    },
 792    {
 793       MESA_FORMAT_SIGNED_RED_RGTC1,
 794       NULL,
 795       _mesa_fetch_texel_2d_f_signed_red_rgtc1,
 796       NULL,
 797       NULL
 798    },
 799    {
 800       MESA_FORMAT_RG_RGTC2,
 801       NULL,
 802       _mesa_fetch_texel_2d_f_rg_rgtc2,
 803       NULL,
 804       NULL
 805    },
 806    {
 807       MESA_FORMAT_SIGNED_RG_RGTC2,
 808       NULL,
 809       _mesa_fetch_texel_2d_f_signed_rg_rgtc2,
 810       NULL,
 811       NULL
 812    },
 813    {
 814       MESA_FORMAT_L_LATC1,
 815       NULL,
 816       _mesa_fetch_texel_2d_f_l_latc1,
 817       NULL,
 818       NULL
 819    },
 820    {
 821       MESA_FORMAT_SIGNED_L_LATC1,
 822       NULL,
 823       _mesa_fetch_texel_2d_f_signed_l_latc1,
 824       NULL,
 825       NULL
 826    },
 827    {
 828       MESA_FORMAT_LA_LATC2,
 829       NULL,
 830       _mesa_fetch_texel_2d_f_la_latc2,
 831       NULL,
 832       NULL
 833    },
 834    {
 835       MESA_FORMAT_SIGNED_LA_LATC2,
 836       NULL,
 837       _mesa_fetch_texel_2d_f_signed_la_latc2,
 838       NULL,
 839       NULL
 840    },
 841    {
 842       MESA_FORMAT_SIGNED_A8,
 843       fetch_texel_1d_signed_a8,
 844       fetch_texel_2d_signed_a8,
 845       fetch_texel_3d_signed_a8,
 846       store_texel_signed_a8
 847    },
 848    {
 849       MESA_FORMAT_SIGNED_L8,
 850       fetch_texel_1d_signed_l8,
 851       fetch_texel_2d_signed_l8,
 852       fetch_texel_3d_signed_l8,
 853       store_texel_signed_l8
 854    },
 855    {
 856       MESA_FORMAT_SIGNED_AL88,
 857       fetch_texel_1d_signed_al88,
 858       fetch_texel_2d_signed_al88,
 859       fetch_texel_3d_signed_al88,
 860       store_texel_signed_al88
 861    },
 862    {
 863       MESA_FORMAT_SIGNED_I8,
 864       fetch_texel_1d_signed_i8,
 865       fetch_texel_2d_signed_i8,
 866       fetch_texel_3d_signed_i8,
 867       store_texel_signed_i8
 868    },
 869    {
 870       MESA_FORMAT_SIGNED_A16,
 871       fetch_texel_1d_signed_a16,
 872       fetch_texel_2d_signed_a16,
 873       fetch_texel_3d_signed_a16,
 874       store_texel_signed_a16
 875    },
 876    {
 877       MESA_FORMAT_SIGNED_L16,
 878       fetch_texel_1d_signed_l16,
 879       fetch_texel_2d_signed_l16,
 880       fetch_texel_3d_signed_l16,
 881       store_texel_signed_l16
 882    },
 883    {
 884       MESA_FORMAT_SIGNED_AL1616,
 885       fetch_texel_1d_signed_al1616,
 886       fetch_texel_2d_signed_al1616,
 887       fetch_texel_3d_signed_al1616,
 888       store_texel_signed_al1616
 889    },
 890    {
 891       MESA_FORMAT_SIGNED_I16,
 892       fetch_texel_1d_signed_i16,
 893       fetch_texel_2d_signed_i16,
 894       fetch_texel_3d_signed_i16,
 895       store_texel_signed_i16
 896    },
 897    {
 898       MESA_FORMAT_RGB9_E5_FLOAT,
 899       fetch_texel_1d_rgb9_e5,
 900       fetch_texel_2d_rgb9_e5,
 901       fetch_texel_3d_rgb9_e5,
 902       store_texel_rgb9_e5
 903    },
 904    {
 905       MESA_FORMAT_R11_G11_B10_FLOAT,
 906       fetch_texel_1d_r11_g11_b10f,
 907       fetch_texel_2d_r11_g11_b10f,
 908       fetch_texel_3d_r11_g11_b10f,
 909       store_texel_r11_g11_b10f
 910    },
 911    {
 912       MESA_FORMAT_Z32_FLOAT,
 913       fetch_texel_1d_f_r_f32, /* Reuse the R32F functions. */
 914       fetch_texel_2d_f_r_f32,
 915       fetch_texel_3d_f_r_f32,
 916       store_texel_r_f32
 917    },
 918    {
 919       MESA_FORMAT_Z32_FLOAT_X24S8,
 920       fetch_texel_1d_z32f_x24s8,
 921       fetch_texel_2d_z32f_x24s8,
 922       fetch_texel_3d_z32f_x24s8,
 923       store_texel_z32f_x24s8
 924    }
 925 };
 926
 927
 928 FetchTexelFuncF
 929 _mesa_get_texel_fetch_func(gl_format format, GLuint dims)
 930 {
 931 #ifdef DEBUG
 932    /* check that the table entries are sorted by format name */
 933    gl_format fmt;
 934    for (fmt = 0; fmt < MESA_FORMAT_COUNT; fmt++) {
 935       assert(texfetch_funcs[fmt].Name == fmt);
 936    }
 937 #endif
 938
 939    assert(Elements(texfetch_funcs) == MESA_FORMAT_COUNT);
 940    assert(format < MESA_FORMAT_COUNT);
 941
 942    switch (dims) {
 943    case 1:
 944       return texfetch_funcs[format].Fetch1D;
 945    case 2:
 946       return texfetch_funcs[format].Fetch2D;
 947    case 3:
 948       return texfetch_funcs[format].Fetch3D;
 949    default:
 950       assert(0 && "bad dims in _mesa_get_texel_fetch_func");
 951       return NULL;
 952    }
 953 }
 954
 955
 956 StoreTexelFunc
 957 _mesa_get_texel_store_func(gl_format format)
 958 {
 959    assert(format < MESA_FORMAT_COUNT);
 960    return texfetch_funcs[format].StoreTexel;
 961 }
 962
 963
 964 /**
 965  * Adaptor for fetching a GLchan texel from a float-valued texture.
 966  */
 967 static void
 968 fetch_texel_float_to_chan(const struct swrast_texture_image *texImage,
 969                           GLint i, GLint j, GLint k, GLchan *texelOut)
 970 {
 971    GLfloat temp[4];
 972    GLenum baseFormat = _mesa_get_format_base_format(texImage->Base.TexFormat);
 973
 974    ASSERT(texImage->FetchTexelf);
 975    texImage->FetchTexelf(texImage, i, j, k, temp);
 976    if (baseFormat == GL_DEPTH_COMPONENT ||
 977        baseFormat == GL_DEPTH_STENCIL_EXT) {
 978       /* just one channel */
 979       UNCLAMPED_FLOAT_TO_CHAN(texelOut[0], temp[0]);
 980    }
 981    else {
 982       /* four channels */
 983       UNCLAMPED_FLOAT_TO_CHAN(texelOut[0], temp[0]);
 984       UNCLAMPED_FLOAT_TO_CHAN(texelOut[1], temp[1]);
 985       UNCLAMPED_FLOAT_TO_CHAN(texelOut[2], temp[2]);
 986       UNCLAMPED_FLOAT_TO_CHAN(texelOut[3], temp[3]);
 987    }
 988 }
 989
 990
 991 #if 0
 992 /**
 993  * Adaptor for fetching a float texel from a GLchan-valued texture.
 994  */
 995 static void
 996 fetch_texel_chan_to_float(const struct swrast_texture_image *texImage,
 997                           GLint i, GLint j, GLint k, GLfloat *texelOut)
 998 {
 999    GLchan temp[4];
1000    GLenum baseFormat = _mesa_get_format_base_format(texImage->TexFormat);
1001
1002    ASSERT(texImage->FetchTexelc);
1003    texImage->FetchTexelc(texImage, i, j, k, temp);
1004    if (baseFormat == GL_DEPTH_COMPONENT ||
1005        baseFormat == GL_DEPTH_STENCIL_EXT) {
1006       /* just one channel */
1007       texelOut[0] = CHAN_TO_FLOAT(temp[0]);
1008    }
1009    else {
1010       /* four channels */
1011       texelOut[0] = CHAN_TO_FLOAT(temp[0]);
1012       texelOut[1] = CHAN_TO_FLOAT(temp[1]);
1013       texelOut[2] = CHAN_TO_FLOAT(temp[2]);
1014       texelOut[3] = CHAN_TO_FLOAT(temp[3]);
1015    }
1016 }
1017 #endif
1018
1019
1020 /**
1021  * Initialize the texture image's FetchTexelc and FetchTexelf methods.
1022  */
1023 static void
1024 set_fetch_functions(struct swrast_texture_image *texImage, GLuint dims)
1025 {
1026    gl_format format = texImage->Base.TexFormat;
1027
1028    ASSERT(dims == 1 || dims == 2 || dims == 3);
1029
1030    if (texImage->Base.TexObject->Sampler.sRGBDecode == GL_SKIP_DECODE_EXT &&
1031        _mesa_get_format_color_encoding(format) == GL_SRGB) {
1032       format = _mesa_get_srgb_format_linear(format);
1033    }
1034
1035    texImage->FetchTexelf = _mesa_get_texel_fetch_func(format, dims);
1036
1037    texImage->FetchTexelc = fetch_texel_float_to_chan;
1038
1039    ASSERT(texImage->FetchTexelc);
1040    ASSERT(texImage->FetchTexelf);
1041 }
1042
1043 void
1044 _mesa_update_fetch_functions(struct gl_texture_object *texObj)
1045 {
1046    GLuint face, i;
1047    GLuint dims;
1048
1049    dims = _mesa_get_texture_dimensions(texObj->Target);
1050
1051    for (face = 0; face < 6; face++) {
1052       for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
1053          if (texObj->Image[face][i]) {
1054             set_fetch_functions(swrast_texture_image(texObj->Image[face][i]),
1055                                 dims);
1056          }
1057       }
1058    }
1059 }