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 "context.h"
  38 #include "texcompress.h"
  39 #include "texcompress_fxt1.h"
  40 #include "texcompress_s3tc.h"
  41 #include "texfetch.h"
  42
  43
  44 #if FEATURE_EXT_texture_sRGB
  45
  46 /**
  47  * Convert an 8-bit sRGB value from non-linear space to a
  48  * linear RGB value in [0, 1].
  49  * Implemented with a 256-entry lookup table.
  50  */
  51 static INLINE GLfloat
  52 nonlinear_to_linear(GLubyte cs8)
  53 {
  54    static GLfloat table[256];
  55    static GLboolean tableReady = GL_FALSE;
  56    if (!tableReady) {
  57       /* compute lookup table now */
  58       GLuint i;
  59       for (i = 0; i < 256; i++) {
  60          const GLfloat cs = UBYTE_TO_FLOAT(i);
  61          if (cs <= 0.04045) {
  62             table[i] = cs / 12.92f;
  63          }
  64          else {
  65             table[i] = (GLfloat) _mesa_pow((cs + 0.055) / 1.055, 2.4);
  66          }
  67       }
  68       tableReady = GL_TRUE;
  69    }
  70    return table[cs8];
  71 }
  72
  73
  74 #endif /* FEATURE_EXT_texture_sRGB */
  75
  76
  77 /* Texel fetch routines for all supported formats
  78  */
  79 #define DIM 1
  80 #include "texformat_tmp.h"
  81
  82 #define DIM 2
  83 #include "texformat_tmp.h"
  84
  85 #define DIM 3
  86 #include "texformat_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    GLuint 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_SRGB8,
 132       fetch_texel_1d_srgb8,
 133       fetch_texel_2d_srgb8,
 134       fetch_texel_3d_srgb8,
 135       store_texel_srgb8
 136    },
 137    {
 138       MESA_FORMAT_SRGBA8,
 139       fetch_texel_1d_srgba8,
 140       fetch_texel_2d_srgba8,
 141       fetch_texel_3d_srgba8,
 142       store_texel_srgba8
 143    },
 144    {
 145       MESA_FORMAT_SARGB8,
 146       fetch_texel_1d_sargb8,
 147       fetch_texel_2d_sargb8,
 148       fetch_texel_3d_sargb8,
 149       store_texel_sargb8
 150    },
 151    {
 152       MESA_FORMAT_SL8,
 153       fetch_texel_1d_sl8,
 154       fetch_texel_2d_sl8,
 155       fetch_texel_3d_sl8,
 156       store_texel_sl8
 157    },
 158    {
 159       MESA_FORMAT_SLA8,
 160       fetch_texel_1d_sla8,
 161       fetch_texel_2d_sla8,
 162       fetch_texel_3d_sla8,
 163       store_texel_sla8
 164    },
 165    {
 166       MESA_FORMAT_RGB_FXT1,
 167       NULL,
 168       _mesa_fetch_texel_2d_f_rgb_fxt1,
 169       NULL,
 170       NULL
 171    },
 172    {
 173       MESA_FORMAT_RGBA_FXT1,
 174       NULL,
 175       _mesa_fetch_texel_2d_f_rgba_fxt1,
 176       NULL,
 177       NULL
 178    },
 179    {
 180       MESA_FORMAT_RGB_DXT1,
 181       NULL,
 182       _mesa_fetch_texel_2d_f_rgb_dxt1,
 183       NULL,
 184       NULL
 185    },
 186    {
 187       MESA_FORMAT_RGBA_DXT1,
 188       NULL,
 189       _mesa_fetch_texel_2d_f_rgba_dxt1,
 190       NULL,
 191       NULL
 192    },
 193    {
 194       MESA_FORMAT_RGBA_DXT3,
 195       NULL,
 196       _mesa_fetch_texel_2d_f_rgba_dxt3,
 197       NULL,
 198       NULL
 199    },
 200    {
 201       MESA_FORMAT_RGBA_DXT5,
 202       NULL,
 203       _mesa_fetch_texel_2d_f_rgba_dxt5,
 204       NULL,
 205       NULL
 206    },
 207    {
 208       MESA_FORMAT_SRGB_DXT1,
 209       NULL,
 210       _mesa_fetch_texel_2d_f_srgb_dxt1,
 211       NULL,
 212       NULL
 213    },
 214    {
 215       MESA_FORMAT_SRGBA_DXT1,
 216       NULL,
 217       _mesa_fetch_texel_2d_f_srgba_dxt1,
 218       NULL,
 219       NULL
 220    },
 221    {
 222       MESA_FORMAT_SRGBA_DXT3,
 223       NULL,
 224       _mesa_fetch_texel_2d_f_srgba_dxt3,
 225       NULL,
 226       NULL
 227    },
 228    {
 229       MESA_FORMAT_SRGBA_DXT5,
 230       NULL,
 231       _mesa_fetch_texel_2d_f_srgba_dxt5,
 232       NULL,
 233       NULL
 234    },
 235    {
 236       MESA_FORMAT_RGBA_FLOAT32,
 237       fetch_texel_1d_f_rgba_f32,
 238       fetch_texel_2d_f_rgba_f32,
 239       fetch_texel_3d_f_rgba_f32,
 240       store_texel_rgba_f32
 241    },
 242    {
 243       MESA_FORMAT_RGBA_FLOAT16,
 244       fetch_texel_1d_f_rgba_f16,
 245       fetch_texel_2d_f_rgba_f16,
 246       fetch_texel_3d_f_rgba_f16,
 247       store_texel_rgba_f16
 248    },
 249    {
 250       MESA_FORMAT_RGB_FLOAT32,
 251       fetch_texel_1d_f_rgb_f32,
 252       fetch_texel_2d_f_rgb_f32,
 253       fetch_texel_3d_f_rgb_f32,
 254       store_texel_rgb_f32
 255    },
 256    {
 257       MESA_FORMAT_RGB_FLOAT16,
 258       fetch_texel_1d_f_rgb_f16,
 259       fetch_texel_2d_f_rgb_f16,
 260       fetch_texel_3d_f_rgb_f16,
 261       store_texel_rgb_f16
 262    },
 263    {
 264       MESA_FORMAT_ALPHA_FLOAT32,
 265       fetch_texel_1d_f_alpha_f32,
 266       fetch_texel_2d_f_alpha_f32,
 267       fetch_texel_3d_f_alpha_f32,
 268       store_texel_alpha_f32
 269    },
 270    {
 271       MESA_FORMAT_ALPHA_FLOAT16,
 272       fetch_texel_1d_f_alpha_f16,
 273       fetch_texel_2d_f_alpha_f16,
 274       fetch_texel_3d_f_alpha_f16,
 275       store_texel_alpha_f16
 276    },
 277    {
 278       MESA_FORMAT_LUMINANCE_FLOAT32,
 279       fetch_texel_1d_f_luminance_f32,
 280       fetch_texel_2d_f_luminance_f32,
 281       fetch_texel_3d_f_luminance_f32,
 282       store_texel_luminance_f32
 283    },
 284    {
 285       MESA_FORMAT_LUMINANCE_FLOAT16,
 286       fetch_texel_1d_f_luminance_f16,
 287       fetch_texel_2d_f_luminance_f16,
 288       fetch_texel_3d_f_luminance_f16,
 289       store_texel_luminance_f16
 290    },
 291    {
 292       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32,
 293       fetch_texel_1d_f_luminance_alpha_f32,
 294       fetch_texel_2d_f_luminance_alpha_f32,
 295       fetch_texel_3d_f_luminance_alpha_f32,
 296       store_texel_luminance_alpha_f32
 297    },
 298    {
 299       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16,
 300       fetch_texel_1d_f_luminance_alpha_f16,
 301       fetch_texel_2d_f_luminance_alpha_f16,
 302       fetch_texel_3d_f_luminance_alpha_f16,
 303       store_texel_luminance_alpha_f16
 304    },
 305    {
 306       MESA_FORMAT_INTENSITY_FLOAT32,
 307       fetch_texel_1d_f_intensity_f32,
 308       fetch_texel_2d_f_intensity_f32,
 309       fetch_texel_3d_f_intensity_f32,
 310       store_texel_intensity_f32
 311    },
 312    {
 313       MESA_FORMAT_INTENSITY_FLOAT16,
 314       fetch_texel_1d_f_intensity_f16,
 315       fetch_texel_2d_f_intensity_f16,
 316       fetch_texel_3d_f_intensity_f16,
 317       store_texel_intensity_f16
 318    },
 319    {
 320       MESA_FORMAT_DUDV8,
 321       fetch_texel_1d_dudv8,
 322       fetch_texel_2d_dudv8,
 323       fetch_texel_3d_dudv8,
 324       NULL
 325    },
 326    {
 327       MESA_FORMAT_SIGNED_RGBA8888,
 328       fetch_texel_1d_signed_rgba8888,
 329       fetch_texel_2d_signed_rgba8888,
 330       fetch_texel_3d_signed_rgba8888,
 331       store_texel_signed_rgba8888
 332    },
 333    {
 334       MESA_FORMAT_SIGNED_RGBA8888_REV,
 335       fetch_texel_1d_signed_rgba8888_rev,
 336       fetch_texel_2d_signed_rgba8888_rev,
 337       fetch_texel_3d_signed_rgba8888_rev,
 338       store_texel_signed_rgba8888_rev
 339    },
 340    {
 341       MESA_FORMAT_RGBA8888,
 342       fetch_texel_1d_f_rgba8888,
 343       fetch_texel_2d_f_rgba8888,
 344       fetch_texel_3d_f_rgba8888,
 345       store_texel_rgba8888
 346    },
 347    {
 348       MESA_FORMAT_RGBA8888_REV,
 349       fetch_texel_1d_f_rgba8888_rev,
 350       fetch_texel_2d_f_rgba8888_rev,
 351       fetch_texel_3d_f_rgba8888_rev,
 352       store_texel_rgba8888_rev
 353    },
 354    {
 355       MESA_FORMAT_ARGB8888,
 356       fetch_texel_1d_f_argb8888,
 357       fetch_texel_2d_f_argb8888,
 358       fetch_texel_3d_f_argb8888,
 359       store_texel_argb8888
 360    },
 361    {
 362       MESA_FORMAT_ARGB8888_REV,
 363       fetch_texel_1d_f_argb8888_rev,
 364       fetch_texel_2d_f_argb8888_rev,
 365       fetch_texel_3d_f_argb8888_rev,
 366       store_texel_argb8888_rev
 367    },
 368    {
 369       MESA_FORMAT_RGB888,
 370       fetch_texel_1d_f_rgb888,
 371       fetch_texel_2d_f_rgb888,
 372       fetch_texel_3d_f_rgb888,
 373       store_texel_rgb888
 374    },
 375    {
 376       MESA_FORMAT_BGR888,
 377       fetch_texel_1d_f_bgr888,
 378       fetch_texel_2d_f_bgr888,
 379       fetch_texel_3d_f_bgr888,
 380       store_texel_bgr888
 381    },
 382    {
 383       MESA_FORMAT_RGB565,
 384       fetch_texel_1d_f_rgb565,
 385       fetch_texel_2d_f_rgb565,
 386       fetch_texel_3d_f_rgb565,
 387       store_texel_rgb565
 388    },
 389    {
 390       MESA_FORMAT_RGB565_REV,
 391       fetch_texel_1d_f_rgb565_rev,
 392       fetch_texel_2d_f_rgb565_rev,
 393       fetch_texel_3d_f_rgb565_rev,
 394       store_texel_rgb565_rev
 395    },
 396    {
 397       MESA_FORMAT_ARGB4444,
 398       fetch_texel_1d_f_argb4444,
 399       fetch_texel_2d_f_argb4444,
 400       fetch_texel_3d_f_argb4444,
 401       store_texel_argb4444
 402    },
 403    {
 404       MESA_FORMAT_ARGB4444_REV,
 405       fetch_texel_1d_f_argb4444_rev,
 406       fetch_texel_2d_f_argb4444_rev,
 407       fetch_texel_3d_f_argb4444_rev,
 408       store_texel_argb4444_rev
 409    },
 410    {
 411       MESA_FORMAT_RGBA5551,
 412       fetch_texel_1d_f_rgba5551,
 413       fetch_texel_2d_f_rgba5551,
 414       fetch_texel_3d_f_rgba5551,
 415       store_texel_rgba5551
 416    },
 417    {
 418       MESA_FORMAT_ARGB1555,
 419       fetch_texel_1d_f_argb1555,
 420       fetch_texel_2d_f_argb1555,
 421       fetch_texel_3d_f_argb1555,
 422       store_texel_argb1555
 423    },
 424    {
 425       MESA_FORMAT_ARGB1555_REV,
 426       fetch_texel_1d_f_argb1555_rev,
 427       fetch_texel_2d_f_argb1555_rev,
 428       fetch_texel_3d_f_argb1555_rev,
 429       store_texel_argb1555_rev
 430    },
 431    {
 432       MESA_FORMAT_AL88,
 433       fetch_texel_1d_f_al88,
 434       fetch_texel_2d_f_al88,
 435       fetch_texel_3d_f_al88,
 436       store_texel_al88
 437    },
 438    {
 439       MESA_FORMAT_AL88_REV,
 440       fetch_texel_1d_f_al88_rev,
 441       fetch_texel_2d_f_al88_rev,
 442       fetch_texel_3d_f_al88_rev,
 443       store_texel_al88_rev
 444    },
 445    {
 446       MESA_FORMAT_RGB332,
 447       fetch_texel_1d_f_rgb332,
 448       fetch_texel_2d_f_rgb332,
 449       fetch_texel_3d_f_rgb332,
 450       store_texel_rgb332
 451    },
 452    {
 453       MESA_FORMAT_A8,
 454       fetch_texel_1d_f_a8,
 455       fetch_texel_2d_f_a8,
 456       fetch_texel_3d_f_a8,
 457       store_texel_a8
 458    },
 459    {
 460       MESA_FORMAT_L8,
 461       fetch_texel_1d_f_l8,
 462       fetch_texel_2d_f_l8,
 463       fetch_texel_3d_f_l8,
 464       store_texel_l8
 465    },
 466    {
 467       MESA_FORMAT_I8,
 468       fetch_texel_1d_f_i8,
 469       fetch_texel_2d_f_i8,
 470       fetch_texel_3d_f_i8,
 471       store_texel_i8
 472    },
 473    {
 474       MESA_FORMAT_CI8,
 475       fetch_texel_1d_f_ci8,
 476       fetch_texel_2d_f_ci8,
 477       fetch_texel_3d_f_ci8,
 478       store_texel_ci8
 479    },
 480    {
 481       MESA_FORMAT_YCBCR,
 482       fetch_texel_1d_f_ycbcr,
 483       fetch_texel_2d_f_ycbcr,
 484       fetch_texel_3d_f_ycbcr,
 485       store_texel_ycbcr
 486    },
 487    {
 488       MESA_FORMAT_YCBCR_REV,
 489       fetch_texel_1d_f_ycbcr_rev,
 490       fetch_texel_2d_f_ycbcr_rev,
 491       fetch_texel_3d_f_ycbcr_rev,
 492       store_texel_ycbcr_rev
 493    },
 494    {
 495       MESA_FORMAT_Z24_S8,
 496       fetch_texel_1d_f_z24_s8,
 497       fetch_texel_2d_f_z24_s8,
 498       fetch_texel_3d_f_z24_s8,
 499       store_texel_z24_s8
 500    },
 501    {
 502       MESA_FORMAT_S8_Z24,
 503       fetch_texel_1d_f_s8_z24,
 504       fetch_texel_2d_f_s8_z24,
 505       fetch_texel_3d_f_s8_z24,
 506       store_texel_s8_z24
 507    },
 508    {
 509       MESA_FORMAT_Z16,
 510       fetch_texel_1d_f_z16,
 511       fetch_texel_2d_f_z16,
 512       fetch_texel_3d_f_z16,
 513       store_texel_z16
 514    },
 515    {
 516       MESA_FORMAT_Z32,
 517       fetch_texel_1d_f_z32,
 518       fetch_texel_2d_f_z32,
 519       fetch_texel_3d_f_z32,
 520       store_texel_z32
 521    }
 522 };
 523
 524
 525 FetchTexelFuncF
 526 _mesa_get_texel_fetch_func(gl_format format, GLuint dims)
 527 {
 528    FetchTexelFuncF f;
 529    GLuint i;
 530    /* XXX replace loop with direct table lookup */
 531    for (i = 0; i < MESA_FORMAT_COUNT; i++) {
 532       if (texfetch_funcs[i].Name == format) {
 533          switch (dims) {
 534          case 1:
 535             f = texfetch_funcs[i].Fetch1D;
 536             break;
 537          case 2:
 538             f = texfetch_funcs[i].Fetch2D;
 539             break;
 540          case 3:
 541             f = texfetch_funcs[i].Fetch3D;
 542             break;
 543          }
 544          if (!f)
 545             f = fetch_null_texelf;
 546          return f;
 547       }
 548    }
 549    return NULL;
 550 }
 551
 552
 553 StoreTexelFunc
 554 _mesa_get_texel_store_func(gl_format format)
 555 {
 556    GLuint i;
 557    /* XXX replace loop with direct table lookup */
 558    for (i = 0; i < MESA_FORMAT_COUNT; i++) {
 559       if (texfetch_funcs[i].Name == format) {
 560          if (texfetch_funcs[i].StoreTexel)
 561             return texfetch_funcs[i].StoreTexel;
 562          else
 563             return store_null_texel;
 564       }
 565    }
 566    return NULL;
 567 }