src/mesa/main/texformat.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.1
   4  *
   5  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   6  * Copyright (c) 2008 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 texformat.c
  29  * Texture formats.
  30  *
  31  * \author Gareth Hughes
  32  */
  33
  34
  35 #include "colormac.h"
  36 #include "context.h"
  37 #include "texcompress.h"
  38 #include "texcompress_fxt1.h"
  39 #include "texcompress_s3tc.h"
  40 #include "texformat.h"
  41 #include "texstore.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  * Notes about the predefined gl_texture_formats:
 118  *
 119  * 1. There are 1D, 2D and 3D functions for fetching texels from texture
 120  *    images, returning both GLchan values and GLfloat values.  (six
 121  *    functions in total)
 122  *    You don't have to provide both the GLchan and GLfloat functions;
 123  *    just one or the other is OK.  Mesa will use an "adaptor" to convert
 124  *    between GLchan/GLfloat when needed.
 125  *    Since the adaptors have small performance penalty, we provide both
 126  *    GLchan and GLfloat functions for some common formats like RGB, RGBA.
 127  */
 128
 129
 130 /***************************************************************/
 131 /** \name Default GLchan-based formats */
 132 /*@{*/
 133
 134 const struct gl_texture_format _mesa_texformat_rgba = {
 135    MESA_FORMAT_RGBA,                    /* MesaFormat */
 136    GL_RGBA,                             /* BaseFormat */
 137    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 138    CHAN_BITS,                           /* RedBits */
 139    CHAN_BITS,                           /* GreenBits */
 140    CHAN_BITS,                           /* BlueBits */
 141    CHAN_BITS,                           /* AlphaBits */
 142    0,                                   /* LuminanceBits */
 143    0,                                   /* IntensityBits */
 144    0,                                   /* IndexBits */
 145    0,                                   /* DepthBits */
 146    0,                                   /* StencilBits */
 147    4 * sizeof(GLchan),                  /* TexelBytes */
 148 };
 149
 150 const struct gl_texture_format _mesa_texformat_rgb = {
 151    MESA_FORMAT_RGB,                     /* MesaFormat */
 152    GL_RGB,                              /* BaseFormat */
 153    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 154    CHAN_BITS,                           /* RedBits */
 155    CHAN_BITS,                           /* GreenBits */
 156    CHAN_BITS,                           /* BlueBits */
 157    0,                                   /* AlphaBits */
 158    0,                                   /* LuminanceBits */
 159    0,                                   /* IntensityBits */
 160    0,                                   /* IndexBits */
 161    0,                                   /* DepthBits */
 162    0,                                   /* StencilBits */
 163    3 * sizeof(GLchan),                  /* TexelBytes */
 164 };
 165
 166 const struct gl_texture_format _mesa_texformat_alpha = {
 167    MESA_FORMAT_ALPHA,                   /* MesaFormat */
 168    GL_ALPHA,                            /* BaseFormat */
 169    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 170    0,                                   /* RedBits */
 171    0,                                   /* GreenBits */
 172    0,                                   /* BlueBits */
 173    CHAN_BITS,                           /* AlphaBits */
 174    0,                                   /* LuminanceBits */
 175    0,                                   /* IntensityBits */
 176    0,                                   /* IndexBits */
 177    0,                                   /* DepthBits */
 178    0,                                   /* StencilBits */
 179    sizeof(GLchan),                      /* TexelBytes */
 180 };
 181
 182 const struct gl_texture_format _mesa_texformat_luminance = {
 183    MESA_FORMAT_LUMINANCE,               /* MesaFormat */
 184    GL_LUMINANCE,                        /* BaseFormat */
 185    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 186    0,                                   /* RedBits */
 187    0,                                   /* GreenBits */
 188    0,                                   /* BlueBits */
 189    0,                                   /* AlphaBits */
 190    CHAN_BITS,                           /* LuminanceBits */
 191    0,                                   /* IntensityBits */
 192    0,                                   /* IndexBits */
 193    0,                                   /* DepthBits */
 194    0,                                   /* StencilBits */
 195    sizeof(GLchan),                      /* TexelBytes */
 196 };
 197
 198 const struct gl_texture_format _mesa_texformat_luminance_alpha = {
 199    MESA_FORMAT_LUMINANCE_ALPHA,         /* MesaFormat */
 200    GL_LUMINANCE_ALPHA,                  /* BaseFormat */
 201    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 202    0,                                   /* RedBits */
 203    0,                                   /* GreenBits */
 204    0,                                   /* BlueBits */
 205    CHAN_BITS,                           /* AlphaBits */
 206    CHAN_BITS,                           /* LuminanceBits */
 207    0,                                   /* IntensityBits */
 208    0,                                   /* IndexBits */
 209    0,                                   /* DepthBits */
 210    0,                                   /* StencilBits */
 211    2 * sizeof(GLchan),                  /* TexelBytes */
 212 };
 213
 214 const struct gl_texture_format _mesa_texformat_intensity = {
 215    MESA_FORMAT_INTENSITY,               /* MesaFormat */
 216    GL_INTENSITY,                        /* BaseFormat */
 217    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 218    0,                                   /* RedBits */
 219    0,                                   /* GreenBits */
 220    0,                                   /* BlueBits */
 221    0,                                   /* AlphaBits */
 222    0,                                   /* LuminanceBits */
 223    CHAN_BITS,                           /* IntensityBits */
 224    0,                                   /* IndexBits */
 225    0,                                   /* DepthBits */
 226    0,                                   /* StencilBits */
 227    sizeof(GLchan),                      /* TexelBytes */
 228 };
 229
 230
 231 #if FEATURE_EXT_texture_sRGB
 232
 233 const struct gl_texture_format _mesa_texformat_srgb8 = {
 234    MESA_FORMAT_SRGB8,                   /* MesaFormat */
 235    GL_RGB,                              /* BaseFormat */
 236    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 237    8,                                   /* RedBits */
 238    8,                                   /* GreenBits */
 239    8,                                   /* BlueBits */
 240    0,                                   /* AlphaBits */
 241    0,                                   /* LuminanceBits */
 242    0,                                   /* IntensityBits */
 243    0,                                   /* IndexBits */
 244    0,                                   /* DepthBits */
 245    0,                                   /* StencilBits */
 246    3,                                   /* TexelBytes */
 247 };
 248
 249 const struct gl_texture_format _mesa_texformat_srgba8 = {
 250    MESA_FORMAT_SRGBA8,                  /* MesaFormat */
 251    GL_RGBA,                             /* BaseFormat */
 252    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 253    8,                                   /* RedBits */
 254    8,                                   /* GreenBits */
 255    8,                                   /* BlueBits */
 256    8,                                   /* AlphaBits */
 257    0,                                   /* LuminanceBits */
 258    0,                                   /* IntensityBits */
 259    0,                                   /* IndexBits */
 260    0,                                   /* DepthBits */
 261    0,                                   /* StencilBits */
 262    4,                                   /* TexelBytes */
 263 };
 264
 265 const struct gl_texture_format _mesa_texformat_sargb8 = {
 266    MESA_FORMAT_SARGB8,                  /* MesaFormat */
 267    GL_RGBA,                             /* BaseFormat */
 268    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 269    8,                                   /* RedBits */
 270    8,                                   /* GreenBits */
 271    8,                                   /* BlueBits */
 272    8,                                   /* AlphaBits */
 273    0,                                   /* LuminanceBits */
 274    0,                                   /* IntensityBits */
 275    0,                                   /* IndexBits */
 276    0,                                   /* DepthBits */
 277    0,                                   /* StencilBits */
 278    4,                                   /* TexelBytes */
 279 };
 280
 281 const struct gl_texture_format _mesa_texformat_sl8 = {
 282    MESA_FORMAT_SL8,                     /* MesaFormat */
 283    GL_LUMINANCE,                        /* BaseFormat */
 284    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 285    0,                                   /* RedBits */
 286    0,                                   /* GreenBits */
 287    0,                                   /* BlueBits */
 288    0,                                   /* AlphaBits */
 289    8,                                   /* LuminanceBits */
 290    0,                                   /* IntensityBits */
 291    0,                                   /* IndexBits */
 292    0,                                   /* DepthBits */
 293    0,                                   /* StencilBits */
 294    1,                                   /* TexelBytes */
 295 };
 296
 297 /* Note: this format name looks like a misnomer, make it sal8? */
 298 const struct gl_texture_format _mesa_texformat_sla8 = {
 299    MESA_FORMAT_SLA8,                    /* MesaFormat */
 300    GL_LUMINANCE_ALPHA,                  /* BaseFormat */
 301    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 302    0,                                   /* RedBits */
 303    0,                                   /* GreenBits */
 304    0,                                   /* BlueBits */
 305    8,                                   /* AlphaBits */
 306    8,                                   /* LuminanceBits */
 307    0,                                   /* IntensityBits */
 308    0,                                   /* IndexBits */
 309    0,                                   /* DepthBits */
 310    0,                                   /* StencilBits */
 311    2,                                   /* TexelBytes */
 312 };
 313
 314 #endif /* FEATURE_EXT_texture_sRGB */
 315
 316 const struct gl_texture_format _mesa_texformat_rgba_float32 = {
 317    MESA_FORMAT_RGBA_FLOAT32,            /* MesaFormat */
 318    GL_RGBA,                             /* BaseFormat */
 319    GL_FLOAT,                            /* DataType */
 320    8 * sizeof(GLfloat),                 /* RedBits */
 321    8 * sizeof(GLfloat),                 /* GreenBits */
 322    8 * sizeof(GLfloat),                 /* BlueBits */
 323    8 * sizeof(GLfloat),                 /* AlphaBits */
 324    0,                                   /* LuminanceBits */
 325    0,                                   /* IntensityBits */
 326    0,                                   /* IndexBits */
 327    0,                                   /* DepthBits */
 328    0,                                   /* StencilBits */
 329    4 * sizeof(GLfloat),                 /* TexelBytes */
 330 };
 331
 332 const struct gl_texture_format _mesa_texformat_rgba_float16 = {
 333    MESA_FORMAT_RGBA_FLOAT16,            /* MesaFormat */
 334    GL_RGBA,                             /* BaseFormat */
 335    GL_FLOAT,                            /* DataType */
 336    8 * sizeof(GLhalfARB),               /* RedBits */
 337    8 * sizeof(GLhalfARB),               /* GreenBits */
 338    8 * sizeof(GLhalfARB),               /* BlueBits */
 339    8 * sizeof(GLhalfARB),               /* AlphaBits */
 340    0,                                   /* LuminanceBits */
 341    0,                                   /* IntensityBits */
 342    0,                                   /* IndexBits */
 343    0,                                   /* DepthBits */
 344    0,                                   /* StencilBits */
 345    4 * sizeof(GLhalfARB),               /* TexelBytes */
 346 };
 347
 348 const struct gl_texture_format _mesa_texformat_rgb_float32 = {
 349    MESA_FORMAT_RGB_FLOAT32,             /* MesaFormat */
 350    GL_RGB,                              /* BaseFormat */
 351    GL_FLOAT,                            /* DataType */
 352    8 * sizeof(GLfloat),                 /* RedBits */
 353    8 * sizeof(GLfloat),                 /* GreenBits */
 354    8 * sizeof(GLfloat),                 /* BlueBits */
 355    0,                                   /* AlphaBits */
 356    0,                                   /* LuminanceBits */
 357    0,                                   /* IntensityBits */
 358    0,                                   /* IndexBits */
 359    0,                                   /* DepthBits */
 360    0,                                   /* StencilBits */
 361    3 * sizeof(GLfloat),                 /* TexelBytes */
 362 };
 363
 364 const struct gl_texture_format _mesa_texformat_rgb_float16 = {
 365    MESA_FORMAT_RGB_FLOAT16,             /* MesaFormat */
 366    GL_RGB,                              /* BaseFormat */
 367    GL_FLOAT,                            /* DataType */
 368    8 * sizeof(GLhalfARB),               /* RedBits */
 369    8 * sizeof(GLhalfARB),               /* GreenBits */
 370    8 * sizeof(GLhalfARB),               /* BlueBits */
 371    0,                                   /* AlphaBits */
 372    0,                                   /* LuminanceBits */
 373    0,                                   /* IntensityBits */
 374    0,                                   /* IndexBits */
 375    0,                                   /* DepthBits */
 376    0,                                   /* StencilBits */
 377    3 * sizeof(GLhalfARB),               /* TexelBytes */
 378 };
 379
 380 const struct gl_texture_format _mesa_texformat_alpha_float32 = {
 381    MESA_FORMAT_ALPHA_FLOAT32,           /* MesaFormat */
 382    GL_ALPHA,                            /* BaseFormat */
 383    GL_FLOAT,                            /* DataType */
 384    0,                                   /* RedBits */
 385    0,                                   /* GreenBits */
 386    0,                                   /* BlueBits */
 387    8 * sizeof(GLfloat),                 /* AlphaBits */
 388    0,                                   /* LuminanceBits */
 389    0,                                   /* IntensityBits */
 390    0,                                   /* IndexBits */
 391    0,                                   /* DepthBits */
 392    0,                                   /* StencilBits */
 393    1 * sizeof(GLfloat),                 /* TexelBytes */
 394 };
 395
 396 const struct gl_texture_format _mesa_texformat_alpha_float16 = {
 397    MESA_FORMAT_ALPHA_FLOAT16,           /* MesaFormat */
 398    GL_ALPHA,                            /* BaseFormat */
 399    GL_FLOAT,                            /* DataType */
 400    0,                                   /* RedBits */
 401    0,                                   /* GreenBits */
 402    0,                                   /* BlueBits */
 403    8 * sizeof(GLhalfARB),               /* AlphaBits */
 404    0,                                   /* LuminanceBits */
 405    0,                                   /* IntensityBits */
 406    0,                                   /* IndexBits */
 407    0,                                   /* DepthBits */
 408    0,                                   /* StencilBits */
 409    1 * sizeof(GLhalfARB),               /* TexelBytes */
 410 };
 411
 412 const struct gl_texture_format _mesa_texformat_luminance_float32 = {
 413    MESA_FORMAT_LUMINANCE_FLOAT32,       /* MesaFormat */
 414    GL_LUMINANCE,                        /* BaseFormat */
 415    GL_FLOAT,                            /* DataType */
 416    0,                                   /* RedBits */
 417    0,                                   /* GreenBits */
 418    0,                                   /* BlueBits */
 419    0,                                   /* AlphaBits */
 420    8 * sizeof(GLfloat),                 /* LuminanceBits */
 421    0,                                   /* IntensityBits */
 422    0,                                   /* IndexBits */
 423    0,                                   /* DepthBits */
 424    0,                                   /* StencilBits */
 425    1 * sizeof(GLfloat),                 /* TexelBytes */
 426 };
 427
 428 const struct gl_texture_format _mesa_texformat_luminance_float16 = {
 429    MESA_FORMAT_LUMINANCE_FLOAT16,       /* MesaFormat */
 430    GL_LUMINANCE,                        /* BaseFormat */
 431    GL_FLOAT,                            /* DataType */
 432    0,                                   /* RedBits */
 433    0,                                   /* GreenBits */
 434    0,                                   /* BlueBits */
 435    0,                                   /* AlphaBits */
 436    8 * sizeof(GLhalfARB),               /* LuminanceBits */
 437    0,                                   /* IntensityBits */
 438    0,                                   /* IndexBits */
 439    0,                                   /* DepthBits */
 440    0,                                   /* StencilBits */
 441    1 * sizeof(GLhalfARB),               /* TexelBytes */
 442 };
 443
 444 const struct gl_texture_format _mesa_texformat_luminance_alpha_float32 = {
 445    MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32, /* MesaFormat */
 446    GL_LUMINANCE_ALPHA,                  /* BaseFormat */
 447    GL_FLOAT,                            /* DataType */
 448    0,                                   /* RedBits */
 449    0,                                   /* GreenBits */
 450    0,                                   /* BlueBits */
 451    8 * sizeof(GLfloat),                 /* AlphaBits */
 452    8 * sizeof(GLfloat),                 /* LuminanceBits */
 453    0,                                   /* IntensityBits */
 454    0,                                   /* IndexBits */
 455    0,                                   /* DepthBits */
 456    0,                                   /* StencilBits */
 457    2 * sizeof(GLfloat),                 /* TexelBytes */
 458 };
 459
 460 const struct gl_texture_format _mesa_texformat_luminance_alpha_float16 = {
 461    MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16, /* MesaFormat */
 462    GL_LUMINANCE_ALPHA,                  /* BaseFormat */
 463    GL_FLOAT,                            /* DataType */
 464    0,                                   /* RedBits */
 465    0,                                   /* GreenBits */
 466    0,                                   /* BlueBits */
 467    8 * sizeof(GLhalfARB),               /* AlphaBits */
 468    8 * sizeof(GLhalfARB),               /* LuminanceBits */
 469    0,                                   /* IntensityBits */
 470    0,                                   /* IndexBits */
 471    0,                                   /* DepthBits */
 472    0,                                   /* StencilBits */
 473    2 * sizeof(GLhalfARB),               /* TexelBytes */
 474 };
 475
 476 const struct gl_texture_format _mesa_texformat_intensity_float32 = {
 477    MESA_FORMAT_INTENSITY_FLOAT32,       /* MesaFormat */
 478    GL_INTENSITY,                        /* BaseFormat */
 479    GL_FLOAT,                            /* DataType */
 480    0,                                   /* RedBits */
 481    0,                                   /* GreenBits */
 482    0,                                   /* BlueBits */
 483    0,                                   /* AlphaBits */
 484    0,                                   /* LuminanceBits */
 485    8 * sizeof(GLfloat),                 /* IntensityBits */
 486    0,                                   /* IndexBits */
 487    0,                                   /* DepthBits */
 488    0,                                   /* StencilBits */
 489    1 * sizeof(GLfloat),                 /* TexelBytes */
 490 };
 491
 492 const struct gl_texture_format _mesa_texformat_intensity_float16 = {
 493    MESA_FORMAT_INTENSITY_FLOAT16,       /* MesaFormat */
 494    GL_INTENSITY,                        /* BaseFormat */
 495    GL_FLOAT,                            /* DataType */
 496    0,                                   /* RedBits */
 497    0,                                   /* GreenBits */
 498    0,                                   /* BlueBits */
 499    0,                                   /* AlphaBits */
 500    0,                                   /* LuminanceBits */
 501    8 * sizeof(GLhalfARB),               /* IntensityBits */
 502    0,                                   /* IndexBits */
 503    0,                                   /* DepthBits */
 504    0,                                   /* StencilBits */
 505    1 * sizeof(GLhalfARB),               /* TexelBytes */
 506 };
 507
 508 const struct gl_texture_format _mesa_texformat_dudv8 = {
 509    MESA_FORMAT_DUDV8,                   /* MesaFormat */
 510    GL_DUDV_ATI,                         /* BaseFormat */
 511    GL_SIGNED_NORMALIZED,                /* DataType */
 512    /* maybe should add dudvBits field, but spec seems to be
 513       lacking the ability to query with GetTexLevelParameter anyway */
 514    0,                                   /* RedBits */
 515    0,                                   /* GreenBits */
 516    0,                                   /* BlueBits */
 517    0,                                   /* AlphaBits */
 518    0,                                   /* LuminanceBits */
 519    0,                                   /* IntensityBits */
 520    0,                                   /* IndexBits */
 521    0,                                   /* DepthBits */
 522    0,                                   /* StencilBits */
 523    2,                                   /* TexelBytes */
 524 };
 525
 526 const struct gl_texture_format _mesa_texformat_signed_rgba8888 = {
 527    MESA_FORMAT_SIGNED_RGBA8888,         /* MesaFormat */
 528    GL_RGBA,                             /* BaseFormat */
 529    GL_SIGNED_NORMALIZED,                /* DataType */
 530    8,                                   /* RedBits */
 531    8,                                   /* GreenBits */
 532    8,                                   /* BlueBits */
 533    8,                                   /* AlphaBits */
 534    0,                                   /* LuminanceBits */
 535    0,                                   /* IntensityBits */
 536    0,                                   /* IndexBits */
 537    0,                                   /* DepthBits */
 538    0,                                   /* StencilBits */
 539    4,                                   /* TexelBytes */
 540 };
 541
 542 const struct gl_texture_format _mesa_texformat_signed_rgba8888_rev = {
 543    MESA_FORMAT_SIGNED_RGBA8888_REV,     /* MesaFormat */
 544    GL_RGBA,                             /* BaseFormat */
 545    GL_SIGNED_NORMALIZED,                /* DataType */
 546    8,                                   /* RedBits */
 547    8,                                   /* GreenBits */
 548    8,                                   /* BlueBits */
 549    8,                                   /* AlphaBits */
 550    0,                                   /* LuminanceBits */
 551    0,                                   /* IntensityBits */
 552    0,                                   /* IndexBits */
 553    0,                                   /* DepthBits */
 554    0,                                   /* StencilBits */
 555    4,                                   /* TexelBytes */
 556 };
 557
 558 /*@}*/
 559
 560
 561 /***************************************************************/
 562 /** \name Hardware formats */
 563 /*@{*/
 564
 565 const struct gl_texture_format _mesa_texformat_rgba8888 = {
 566    MESA_FORMAT_RGBA8888,                /* MesaFormat */
 567    GL_RGBA,                             /* BaseFormat */
 568    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 569    8,                                   /* RedBits */
 570    8,                                   /* GreenBits */
 571    8,                                   /* BlueBits */
 572    8,                                   /* AlphaBits */
 573    0,                                   /* LuminanceBits */
 574    0,                                   /* IntensityBits */
 575    0,                                   /* IndexBits */
 576    0,                                   /* DepthBits */
 577    0,                                   /* StencilBits */
 578    4,                                   /* TexelBytes */
 579 };
 580
 581 const struct gl_texture_format _mesa_texformat_rgba8888_rev = {
 582    MESA_FORMAT_RGBA8888_REV,            /* MesaFormat */
 583    GL_RGBA,                             /* BaseFormat */
 584    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 585    8,                                   /* RedBits */
 586    8,                                   /* GreenBits */
 587    8,                                   /* BlueBits */
 588    8,                                   /* AlphaBits */
 589    0,                                   /* LuminanceBits */
 590    0,                                   /* IntensityBits */
 591    0,                                   /* IndexBits */
 592    0,                                   /* DepthBits */
 593    0,                                   /* StencilBits */
 594    4,                                   /* TexelBytes */
 595 };
 596
 597 const struct gl_texture_format _mesa_texformat_argb8888 = {
 598    MESA_FORMAT_ARGB8888,                /* MesaFormat */
 599    GL_RGBA,                             /* BaseFormat */
 600    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 601    8,                                   /* RedBits */
 602    8,                                   /* GreenBits */
 603    8,                                   /* BlueBits */
 604    8,                                   /* AlphaBits */
 605    0,                                   /* LuminanceBits */
 606    0,                                   /* IntensityBits */
 607    0,                                   /* IndexBits */
 608    0,                                   /* DepthBits */
 609    0,                                   /* StencilBits */
 610    4,                                   /* TexelBytes */
 611 };
 612
 613 const struct gl_texture_format _mesa_texformat_argb8888_rev = {
 614    MESA_FORMAT_ARGB8888_REV,            /* MesaFormat */
 615    GL_RGBA,                             /* BaseFormat */
 616    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 617    8,                                   /* RedBits */
 618    8,                                   /* GreenBits */
 619    8,                                   /* BlueBits */
 620    8,                                   /* AlphaBits */
 621    0,                                   /* LuminanceBits */
 622    0,                                   /* IntensityBits */
 623    0,                                   /* IndexBits */
 624    0,                                   /* DepthBits */
 625    0,                                   /* StencilBits */
 626    4,                                   /* TexelBytes */
 627 };
 628
 629 const struct gl_texture_format _mesa_texformat_rgb888 = {
 630    MESA_FORMAT_RGB888,                  /* MesaFormat */
 631    GL_RGB,                              /* BaseFormat */
 632    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 633    8,                                   /* RedBits */
 634    8,                                   /* GreenBits */
 635    8,                                   /* BlueBits */
 636    0,                                   /* AlphaBits */
 637    0,                                   /* LuminanceBits */
 638    0,                                   /* IntensityBits */
 639    0,                                   /* IndexBits */
 640    0,                                   /* DepthBits */
 641    0,                                   /* StencilBits */
 642    3,                                   /* TexelBytes */
 643 };
 644
 645 const struct gl_texture_format _mesa_texformat_bgr888 = {
 646    MESA_FORMAT_BGR888,                  /* MesaFormat */
 647    GL_RGB,                              /* BaseFormat */
 648    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 649    8,                                   /* RedBits */
 650    8,                                   /* GreenBits */
 651    8,                                   /* BlueBits */
 652    0,                                   /* AlphaBits */
 653    0,                                   /* LuminanceBits */
 654    0,                                   /* IntensityBits */
 655    0,                                   /* IndexBits */
 656    0,                                   /* DepthBits */
 657    0,                                   /* StencilBits */
 658    3,                                   /* TexelBytes */
 659 };
 660
 661 const struct gl_texture_format _mesa_texformat_rgb565 = {
 662    MESA_FORMAT_RGB565,                  /* MesaFormat */
 663    GL_RGB,                              /* BaseFormat */
 664    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 665    5,                                   /* RedBits */
 666    6,                                   /* GreenBits */
 667    5,                                   /* BlueBits */
 668    0,                                   /* AlphaBits */
 669    0,                                   /* LuminanceBits */
 670    0,                                   /* IntensityBits */
 671    0,                                   /* IndexBits */
 672    0,                                   /* DepthBits */
 673    0,                                   /* StencilBits */
 674    2,                                   /* TexelBytes */
 675 };
 676
 677 const struct gl_texture_format _mesa_texformat_rgb565_rev = {
 678    MESA_FORMAT_RGB565_REV,              /* MesaFormat */
 679    GL_RGB,                              /* BaseFormat */
 680    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 681    5,                                   /* RedBits */
 682    6,                                   /* GreenBits */
 683    5,                                   /* BlueBits */
 684    0,                                   /* AlphaBits */
 685    0,                                   /* LuminanceBits */
 686    0,                                   /* IntensityBits */
 687    0,                                   /* IndexBits */
 688    0,                                   /* DepthBits */
 689    0,                                   /* StencilBits */
 690    2,                                   /* TexelBytes */
 691 };
 692
 693 const struct gl_texture_format _mesa_texformat_rgba4444 = {
 694    MESA_FORMAT_RGBA4444,                /* MesaFormat */
 695    GL_RGBA,                             /* BaseFormat */
 696    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 697    4,                                   /* RedBits */
 698    4,                                   /* GreenBits */
 699    4,                                   /* BlueBits */
 700    4,                                   /* AlphaBits */
 701    0,                                   /* LuminanceBits */
 702    0,                                   /* IntensityBits */
 703    0,                                   /* IndexBits */
 704    0,                                   /* DepthBits */
 705    0,                                   /* StencilBits */
 706    2,                                   /* TexelBytes */
 707 };
 708
 709 const struct gl_texture_format _mesa_texformat_argb4444 = {
 710    MESA_FORMAT_ARGB4444,                /* MesaFormat */
 711    GL_RGBA,                             /* BaseFormat */
 712    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 713    4,                                   /* RedBits */
 714    4,                                   /* GreenBits */
 715    4,                                   /* BlueBits */
 716    4,                                   /* AlphaBits */
 717    0,                                   /* LuminanceBits */
 718    0,                                   /* IntensityBits */
 719    0,                                   /* IndexBits */
 720    0,                                   /* DepthBits */
 721    0,                                   /* StencilBits */
 722    2,                                   /* TexelBytes */
 723 };
 724
 725 const struct gl_texture_format _mesa_texformat_argb4444_rev = {
 726    MESA_FORMAT_ARGB4444_REV,            /* MesaFormat */
 727    GL_RGBA,                             /* BaseFormat */
 728    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 729    4,                                   /* RedBits */
 730    4,                                   /* GreenBits */
 731    4,                                   /* BlueBits */
 732    4,                                   /* AlphaBits */
 733    0,                                   /* LuminanceBits */
 734    0,                                   /* IntensityBits */
 735    0,                                   /* IndexBits */
 736    0,                                   /* DepthBits */
 737    0,                                   /* StencilBits */
 738    2,                                   /* TexelBytes */
 739 };
 740
 741 const struct gl_texture_format _mesa_texformat_rgba5551 = {
 742    MESA_FORMAT_RGBA5551,                /* MesaFormat */
 743    GL_RGBA,                             /* BaseFormat */
 744    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 745    5,                                   /* RedBits */
 746    5,                                   /* GreenBits */
 747    5,                                   /* BlueBits */
 748    1,                                   /* AlphaBits */
 749    0,                                   /* LuminanceBits */
 750    0,                                   /* IntensityBits */
 751    0,                                   /* IndexBits */
 752    0,                                   /* DepthBits */
 753    0,                                   /* StencilBits */
 754    2,                                   /* TexelBytes */
 755 };
 756
 757 const struct gl_texture_format _mesa_texformat_argb1555 = {
 758    MESA_FORMAT_ARGB1555,                /* MesaFormat */
 759    GL_RGBA,                             /* BaseFormat */
 760    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 761    5,                                   /* RedBits */
 762    5,                                   /* GreenBits */
 763    5,                                   /* BlueBits */
 764    1,                                   /* AlphaBits */
 765    0,                                   /* LuminanceBits */
 766    0,                                   /* IntensityBits */
 767    0,                                   /* IndexBits */
 768    0,                                   /* DepthBits */
 769    0,                                   /* StencilBits */
 770    2,                                   /* TexelBytes */
 771 };
 772
 773 const struct gl_texture_format _mesa_texformat_argb1555_rev = {
 774    MESA_FORMAT_ARGB1555_REV,            /* MesaFormat */
 775    GL_RGBA,                             /* BaseFormat */
 776    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 777    5,                                   /* RedBits */
 778    5,                                   /* GreenBits */
 779    5,                                   /* BlueBits */
 780    1,                                   /* AlphaBits */
 781    0,                                   /* LuminanceBits */
 782    0,                                   /* IntensityBits */
 783    0,                                   /* IndexBits */
 784    0,                                   /* DepthBits */
 785    0,                                   /* StencilBits */
 786    2,                                   /* TexelBytes */
 787 };
 788
 789 const struct gl_texture_format _mesa_texformat_al88 = {
 790    MESA_FORMAT_AL88,                    /* MesaFormat */
 791    GL_LUMINANCE_ALPHA,                  /* BaseFormat */
 792    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 793    0,                                   /* RedBits */
 794    0,                                   /* GreenBits */
 795    0,                                   /* BlueBits */
 796    8,                                   /* AlphaBits */
 797    8,                                   /* LuminanceBits */
 798    0,                                   /* IntensityBits */
 799    0,                                   /* IndexBits */
 800    0,                                   /* DepthBits */
 801    0,                                   /* StencilBits */
 802    2,                                   /* TexelBytes */
 803 };
 804
 805 const struct gl_texture_format _mesa_texformat_al88_rev = {
 806    MESA_FORMAT_AL88_REV,                /* MesaFormat */
 807    GL_LUMINANCE_ALPHA,                  /* BaseFormat */
 808    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 809    0,                                   /* RedBits */
 810    0,                                   /* GreenBits */
 811    0,                                   /* BlueBits */
 812    8,                                   /* AlphaBits */
 813    8,                                   /* LuminanceBits */
 814    0,                                   /* IntensityBits */
 815    0,                                   /* IndexBits */
 816    0,                                   /* DepthBits */
 817    0,                                   /* StencilBits */
 818    2,                                   /* TexelBytes */
 819 };
 820
 821 const struct gl_texture_format _mesa_texformat_rgb332 = {
 822    MESA_FORMAT_RGB332,                  /* MesaFormat */
 823    GL_RGB,                              /* BaseFormat */
 824    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 825    3,                                   /* RedBits */
 826    3,                                   /* GreenBits */
 827    2,                                   /* BlueBits */
 828    0,                                   /* AlphaBits */
 829    0,                                   /* LuminanceBits */
 830    0,                                   /* IntensityBits */
 831    0,                                   /* IndexBits */
 832    0,                                   /* DepthBits */
 833    0,                                   /* StencilBits */
 834    1,                                   /* TexelBytes */
 835 };
 836
 837 const struct gl_texture_format _mesa_texformat_a8 = {
 838    MESA_FORMAT_A8,                      /* MesaFormat */
 839    GL_ALPHA,                            /* BaseFormat */
 840    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 841    0,                                   /* RedBits */
 842    0,                                   /* GreenBits */
 843    0,                                   /* BlueBits */
 844    8,                                   /* AlphaBits */
 845    0,                                   /* LuminanceBits */
 846    0,                                   /* IntensityBits */
 847    0,                                   /* IndexBits */
 848    0,                                   /* DepthBits */
 849    0,                                   /* StencilBits */
 850    1,                                   /* TexelBytes */
 851 };
 852
 853 const struct gl_texture_format _mesa_texformat_l8 = {
 854    MESA_FORMAT_L8,                      /* MesaFormat */
 855    GL_LUMINANCE,                        /* BaseFormat */
 856    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 857    0,                                   /* RedBits */
 858    0,                                   /* GreenBits */
 859    0,                                   /* BlueBits */
 860    0,                                   /* AlphaBits */
 861    8,                                   /* LuminanceBits */
 862    0,                                   /* IntensityBits */
 863    0,                                   /* IndexBits */
 864    0,                                   /* DepthBits */
 865    0,                                   /* StencilBits */
 866    1,                                   /* TexelBytes */
 867 };
 868
 869 const struct gl_texture_format _mesa_texformat_i8 = {
 870    MESA_FORMAT_I8,                      /* MesaFormat */
 871    GL_INTENSITY,                        /* BaseFormat */
 872    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 873    0,                                   /* RedBits */
 874    0,                                   /* GreenBits */
 875    0,                                   /* BlueBits */
 876    0,                                   /* AlphaBits */
 877    0,                                   /* LuminanceBits */
 878    8,                                   /* IntensityBits */
 879    0,                                   /* IndexBits */
 880    0,                                   /* DepthBits */
 881    0,                                   /* StencilBits */
 882    1,                                   /* TexelBytes */
 883 };
 884
 885 const struct gl_texture_format _mesa_texformat_ci8 = {
 886    MESA_FORMAT_CI8,                     /* MesaFormat */
 887    GL_COLOR_INDEX,                      /* BaseFormat */
 888    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 889    0,                                   /* RedBits */
 890    0,                                   /* GreenBits */
 891    0,                                   /* BlueBits */
 892    0,                                   /* AlphaBits */
 893    0,                                   /* LuminanceBits */
 894    0,                                   /* IntensityBits */
 895    8,                                   /* IndexBits */
 896    0,                                   /* DepthBits */
 897    0,                                   /* StencilBits */
 898    1,                                   /* TexelBytes */
 899 };
 900
 901 const struct gl_texture_format _mesa_texformat_ycbcr = {
 902    MESA_FORMAT_YCBCR,                   /* MesaFormat */
 903    GL_YCBCR_MESA,                       /* BaseFormat */
 904    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 905    0,                                   /* RedBits */
 906    0,                                   /* GreenBits */
 907    0,                                   /* BlueBits */
 908    0,                                   /* AlphaBits */
 909    0,                                   /* LuminanceBits */
 910    0,                                   /* IntensityBits */
 911    0,                                   /* IndexBits */
 912    0,                                   /* DepthBits */
 913    0,                                   /* StencilBits */
 914    2,                                   /* TexelBytes */
 915 };
 916
 917 const struct gl_texture_format _mesa_texformat_ycbcr_rev = {
 918    MESA_FORMAT_YCBCR_REV,               /* MesaFormat */
 919    GL_YCBCR_MESA,                       /* BaseFormat */
 920    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 921    0,                                   /* RedBits */
 922    0,                                   /* GreenBits */
 923    0,                                   /* BlueBits */
 924    0,                                   /* AlphaBits */
 925    0,                                   /* LuminanceBits */
 926    0,                                   /* IntensityBits */
 927    0,                                   /* IndexBits */
 928    0,                                   /* DepthBits */
 929    0,                                   /* StencilBits */
 930    2,                                   /* TexelBytes */
 931 };
 932
 933 const struct gl_texture_format _mesa_texformat_z24_s8 = {
 934    MESA_FORMAT_Z24_S8,                  /* MesaFormat */
 935    GL_DEPTH_STENCIL_EXT,                /* BaseFormat */
 936    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 937    0,                                   /* RedBits */
 938    0,                                   /* GreenBits */
 939    0,                                   /* BlueBits */
 940    0,                                   /* AlphaBits */
 941    0,                                   /* LuminanceBits */
 942    0,                                   /* IntensityBits */
 943    0,                                   /* IndexBits */
 944    24,                                  /* DepthBits */
 945    8,                                   /* StencilBits */
 946    4,                                   /* TexelBytes */
 947 };
 948
 949 const struct gl_texture_format _mesa_texformat_s8_z24 = {
 950    MESA_FORMAT_S8_Z24,                  /* MesaFormat */
 951    GL_DEPTH_STENCIL_EXT,                /* BaseFormat */
 952    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 953    0,                                   /* RedBits */
 954    0,                                   /* GreenBits */
 955    0,                                   /* BlueBits */
 956    0,                                   /* AlphaBits */
 957    0,                                   /* LuminanceBits */
 958    0,                                   /* IntensityBits */
 959    0,                                   /* IndexBits */
 960    24,                                  /* DepthBits */
 961    8,                                   /* StencilBits */
 962    4,                                   /* TexelBytes */
 963 };
 964
 965 const struct gl_texture_format _mesa_texformat_z16 = {
 966    MESA_FORMAT_Z16,                     /* MesaFormat */
 967    GL_DEPTH_COMPONENT,                  /* BaseFormat */
 968    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 969    0,                                   /* RedBits */
 970    0,                                   /* GreenBits */
 971    0,                                   /* BlueBits */
 972    0,                                   /* AlphaBits */
 973    0,                                   /* LuminanceBits */
 974    0,                                   /* IntensityBits */
 975    0,                                   /* IndexBits */
 976    sizeof(GLushort) * 8,                /* DepthBits */
 977    0,                                   /* StencilBits */
 978    sizeof(GLushort),                    /* TexelBytes */
 979 };
 980
 981 const struct gl_texture_format _mesa_texformat_z32 = {
 982    MESA_FORMAT_Z32,                     /* MesaFormat */
 983    GL_DEPTH_COMPONENT,                  /* BaseFormat */
 984    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 985    0,                                   /* RedBits */
 986    0,                                   /* GreenBits */
 987    0,                                   /* BlueBits */
 988    0,                                   /* AlphaBits */
 989    0,                                   /* LuminanceBits */
 990    0,                                   /* IntensityBits */
 991    0,                                   /* IndexBits */
 992    sizeof(GLuint) * 8,                  /* DepthBits */
 993    0,                                   /* StencilBits */
 994    sizeof(GLuint),                      /* TexelBytes */
 995 };
 996
 997 /*@}*/
 998
 999
1000 /***************************************************************/
1001 /** \name Null format (useful for proxy textures) */
1002 /*@{*/
1003
1004 const struct gl_texture_format _mesa_null_texformat = {
1005    -1,                                  /* MesaFormat */
1006    0,                                   /* BaseFormat */
1007    GL_NONE,                             /* DataType */
1008    0,                                   /* RedBits */
1009    0,                                   /* GreenBits */
1010    0,                                   /* BlueBits */
1011    0,                                   /* AlphaBits */
1012    0,                                   /* LuminanceBits */
1013    0,                                   /* IntensityBits */
1014    0,                                   /* IndexBits */
1015    0,                                   /* DepthBits */
1016    0,                                   /* StencilBits */
1017    0,                                   /* TexelBytes */
1018 };
1019
1020 /*@}*/
1021
1022
1023 /**
1024  * Choose an appropriate texture format given the format, type and
1025  * internalFormat parameters passed to glTexImage().
1026  *
1027  * \param ctx  the GL context.
1028  * \param internalFormat  user's prefered internal texture format.
1029  * \param format  incoming image pixel format.
1030  * \param type  incoming image data type.
1031  *
1032  * \return a pointer to a gl_texture_format object which describes the
1033  * choosen texture format, or NULL on failure.
1034  *
1035  * This is called via dd_function_table::ChooseTextureFormat.  Hardware drivers
1036  * will typically override this function with a specialized version.
1037  */
1038 const struct gl_texture_format *
1039 _mesa_choose_tex_format( GLcontext *ctx, GLint internalFormat,
1040                          GLenum format, GLenum type )
1041 {
1042    (void) format;
1043    (void) type;
1044
1045    switch (internalFormat) {
1046       /* RGBA formats */
1047       case 4:
1048       case GL_RGBA:
1049       case GL_RGB10_A2:
1050       case GL_RGBA12:
1051       case GL_RGBA16:
1052          return &_mesa_texformat_rgba;
1053       case GL_RGBA8:
1054          return &_mesa_texformat_rgba8888;
1055       case GL_RGB5_A1:
1056          return &_mesa_texformat_argb1555;
1057       case GL_RGBA2:
1058          return &_mesa_texformat_argb4444_rev; /* just to test another format*/
1059       case GL_RGBA4:
1060          return &_mesa_texformat_argb4444;
1061
1062       /* RGB formats */
1063       case 3:
1064       case GL_RGB:
1065       case GL_RGB10:
1066       case GL_RGB12:
1067       case GL_RGB16:
1068          return &_mesa_texformat_rgb;
1069       case GL_RGB8:
1070          return &_mesa_texformat_rgb888;
1071       case GL_R3_G3_B2:
1072          return &_mesa_texformat_rgb332;
1073       case GL_RGB4:
1074          return &_mesa_texformat_rgb565_rev; /* just to test another format */
1075       case GL_RGB5:
1076          return &_mesa_texformat_rgb565;
1077
1078       /* Alpha formats */
1079       case GL_ALPHA:
1080       case GL_ALPHA4:
1081       case GL_ALPHA12:
1082       case GL_ALPHA16:
1083          return &_mesa_texformat_alpha;
1084       case GL_ALPHA8:
1085          return &_mesa_texformat_a8;
1086
1087       /* Luminance formats */
1088       case 1:
1089       case GL_LUMINANCE:
1090       case GL_LUMINANCE4:
1091       case GL_LUMINANCE12:
1092       case GL_LUMINANCE16:
1093          return &_mesa_texformat_luminance;
1094       case GL_LUMINANCE8:
1095          return &_mesa_texformat_l8;
1096
1097       /* Luminance/Alpha formats */
1098       case 2:
1099       case GL_LUMINANCE_ALPHA:
1100       case GL_LUMINANCE4_ALPHA4:
1101       case GL_LUMINANCE6_ALPHA2:
1102       case GL_LUMINANCE12_ALPHA4:
1103       case GL_LUMINANCE12_ALPHA12:
1104       case GL_LUMINANCE16_ALPHA16:
1105          return &_mesa_texformat_luminance_alpha;
1106       case GL_LUMINANCE8_ALPHA8:
1107          return &_mesa_texformat_al88;
1108
1109       case GL_INTENSITY:
1110       case GL_INTENSITY4:
1111       case GL_INTENSITY12:
1112       case GL_INTENSITY16:
1113          return &_mesa_texformat_intensity;
1114       case GL_INTENSITY8:
1115          return &_mesa_texformat_i8;
1116
1117       case GL_COLOR_INDEX:
1118       case GL_COLOR_INDEX1_EXT:
1119       case GL_COLOR_INDEX2_EXT:
1120       case GL_COLOR_INDEX4_EXT:
1121       case GL_COLOR_INDEX12_EXT:
1122       case GL_COLOR_INDEX16_EXT:
1123       case GL_COLOR_INDEX8_EXT:
1124          return &_mesa_texformat_ci8;
1125
1126       default:
1127          ; /* fallthrough */
1128    }
1129
1130    if (ctx->Extensions.ARB_depth_texture) {
1131       switch (internalFormat) {
1132          case GL_DEPTH_COMPONENT:
1133          case GL_DEPTH_COMPONENT24:
1134          case GL_DEPTH_COMPONENT32:
1135             return &_mesa_texformat_z32;
1136          case GL_DEPTH_COMPONENT16:
1137             return &_mesa_texformat_z16;
1138          default:
1139             ; /* fallthrough */
1140       }
1141    }
1142
1143    switch (internalFormat) {
1144       case GL_COMPRESSED_ALPHA_ARB:
1145          return &_mesa_texformat_alpha;
1146       case GL_COMPRESSED_LUMINANCE_ARB:
1147          return &_mesa_texformat_luminance;
1148       case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
1149          return &_mesa_texformat_luminance_alpha;
1150       case GL_COMPRESSED_INTENSITY_ARB:
1151          return &_mesa_texformat_intensity;
1152       case GL_COMPRESSED_RGB_ARB:
1153 #if FEATURE_texture_fxt1
1154          if (ctx->Extensions.TDFX_texture_compression_FXT1)
1155             return &_mesa_texformat_rgb_fxt1;
1156 #endif
1157 #if FEATURE_texture_s3tc
1158          if (ctx->Extensions.EXT_texture_compression_s3tc ||
1159              ctx->Extensions.S3_s3tc)
1160             return &_mesa_texformat_rgb_dxt1;
1161 #endif
1162          return &_mesa_texformat_rgb;
1163       case GL_COMPRESSED_RGBA_ARB:
1164 #if FEATURE_texture_fxt1
1165          if (ctx->Extensions.TDFX_texture_compression_FXT1)
1166             return &_mesa_texformat_rgba_fxt1;
1167 #endif
1168 #if FEATURE_texture_s3tc
1169          if (ctx->Extensions.EXT_texture_compression_s3tc ||
1170              ctx->Extensions.S3_s3tc)
1171             return &_mesa_texformat_rgba_dxt3; /* Not rgba_dxt1, see spec */
1172 #endif
1173          return &_mesa_texformat_rgba;
1174       default:
1175          ; /* fallthrough */
1176    }
1177
1178    if (ctx->Extensions.MESA_ycbcr_texture) {
1179       if (internalFormat == GL_YCBCR_MESA) {
1180          if (type == GL_UNSIGNED_SHORT_8_8_MESA)
1181             return &_mesa_texformat_ycbcr;
1182          else
1183             return &_mesa_texformat_ycbcr_rev;
1184       }
1185    }
1186
1187 #if FEATURE_texture_fxt1
1188    if (ctx->Extensions.TDFX_texture_compression_FXT1) {
1189       switch (internalFormat) {
1190          case GL_COMPRESSED_RGB_FXT1_3DFX:
1191             return &_mesa_texformat_rgb_fxt1;
1192          case GL_COMPRESSED_RGBA_FXT1_3DFX:
1193             return &_mesa_texformat_rgba_fxt1;
1194          default:
1195             ; /* fallthrough */
1196       }
1197    }
1198 #endif
1199
1200 #if FEATURE_texture_s3tc
1201    if (ctx->Extensions.EXT_texture_compression_s3tc) {
1202       switch (internalFormat) {
1203          case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
1204             return &_mesa_texformat_rgb_dxt1;
1205          case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
1206             return &_mesa_texformat_rgba_dxt1;
1207          case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
1208             return &_mesa_texformat_rgba_dxt3;
1209          case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
1210             return &_mesa_texformat_rgba_dxt5;
1211          default:
1212             ; /* fallthrough */
1213       }
1214    }
1215
1216    if (ctx->Extensions.S3_s3tc) {
1217       switch (internalFormat) {
1218          case GL_RGB_S3TC:
1219          case GL_RGB4_S3TC:
1220             return &_mesa_texformat_rgb_dxt1;
1221          case GL_RGBA_S3TC:
1222          case GL_RGBA4_S3TC:
1223             return &_mesa_texformat_rgba_dxt3;
1224          default:
1225             ; /* fallthrough */
1226       }
1227    }
1228 #endif
1229
1230    if (ctx->Extensions.ARB_texture_float) {
1231       switch (internalFormat) {
1232          case GL_ALPHA16F_ARB:
1233             return &_mesa_texformat_alpha_float16;
1234          case GL_ALPHA32F_ARB:
1235             return &_mesa_texformat_alpha_float32;
1236          case GL_LUMINANCE16F_ARB:
1237             return &_mesa_texformat_luminance_float16;
1238          case GL_LUMINANCE32F_ARB:
1239             return &_mesa_texformat_luminance_float32;
1240          case GL_LUMINANCE_ALPHA16F_ARB:
1241             return &_mesa_texformat_luminance_alpha_float16;
1242          case GL_LUMINANCE_ALPHA32F_ARB:
1243             return &_mesa_texformat_luminance_alpha_float32;
1244          case GL_INTENSITY16F_ARB:
1245             return &_mesa_texformat_intensity_float16;
1246          case GL_INTENSITY32F_ARB:
1247             return &_mesa_texformat_intensity_float32;
1248          case GL_RGB16F_ARB:
1249             return &_mesa_texformat_rgb_float16;
1250          case GL_RGB32F_ARB:
1251             return &_mesa_texformat_rgb_float32;
1252          case GL_RGBA16F_ARB:
1253             return &_mesa_texformat_rgba_float16;
1254          case GL_RGBA32F_ARB:
1255             return &_mesa_texformat_rgba_float32;
1256          default:
1257             ; /* fallthrough */
1258       }
1259    }
1260
1261    if (ctx->Extensions.EXT_packed_depth_stencil) {
1262       switch (internalFormat) {
1263          case GL_DEPTH_STENCIL_EXT:
1264          case GL_DEPTH24_STENCIL8_EXT:
1265             return &_mesa_texformat_z24_s8;
1266          default:
1267             ; /* fallthrough */
1268       }
1269    }
1270
1271    if (ctx->Extensions.ATI_envmap_bumpmap) {
1272       switch (internalFormat) {
1273          case GL_DUDV_ATI:
1274          case GL_DU8DV8_ATI:
1275             return &_mesa_texformat_dudv8;
1276          default:
1277             ; /* fallthrough */
1278       }
1279    }
1280
1281    if (ctx->Extensions.MESA_texture_signed_rgba) {
1282       switch (internalFormat) {
1283          case GL_RGBA_SNORM:
1284          case GL_RGBA8_SNORM:
1285             return &_mesa_texformat_signed_rgba8888;
1286          default:
1287             ; /* fallthrough */
1288       }
1289    }
1290
1291
1292 #if FEATURE_EXT_texture_sRGB
1293    if (ctx->Extensions.EXT_texture_sRGB) {
1294       switch (internalFormat) {
1295          case GL_SRGB_EXT:
1296          case GL_SRGB8_EXT:
1297             return &_mesa_texformat_srgb8;
1298          case GL_SRGB_ALPHA_EXT:
1299          case GL_SRGB8_ALPHA8_EXT:
1300             return &_mesa_texformat_srgba8;
1301          case GL_SLUMINANCE_EXT:
1302          case GL_SLUMINANCE8_EXT:
1303             return &_mesa_texformat_sl8;
1304          case GL_SLUMINANCE_ALPHA_EXT:
1305          case GL_SLUMINANCE8_ALPHA8_EXT:
1306             return &_mesa_texformat_sla8;
1307          case GL_COMPRESSED_SLUMINANCE_EXT:
1308             return &_mesa_texformat_sl8;
1309          case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
1310             return &_mesa_texformat_sla8;
1311          case GL_COMPRESSED_SRGB_EXT:
1312 #if FEATURE_texture_s3tc
1313             if (ctx->Extensions.EXT_texture_compression_s3tc)
1314                return &_mesa_texformat_srgb_dxt1;
1315 #endif
1316             return &_mesa_texformat_srgb8;
1317          case GL_COMPRESSED_SRGB_ALPHA_EXT:
1318 #if FEATURE_texture_s3tc
1319             if (ctx->Extensions.EXT_texture_compression_s3tc)
1320                return &_mesa_texformat_srgba_dxt3; /* Not srgba_dxt1, see spec */
1321 #endif
1322             return &_mesa_texformat_srgba8;
1323 #if FEATURE_texture_s3tc
1324          case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
1325             if (ctx->Extensions.EXT_texture_compression_s3tc)
1326                return &_mesa_texformat_srgb_dxt1;
1327             break;
1328          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
1329             if (ctx->Extensions.EXT_texture_compression_s3tc)
1330                return &_mesa_texformat_srgba_dxt1;
1331             break;
1332          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
1333             if (ctx->Extensions.EXT_texture_compression_s3tc)
1334                return &_mesa_texformat_srgba_dxt3;
1335             break;
1336          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
1337             if (ctx->Extensions.EXT_texture_compression_s3tc)
1338                return &_mesa_texformat_srgba_dxt5;
1339             break;
1340 #endif
1341          default:
1342             ; /* fallthrough */
1343       }
1344    }
1345 #endif /* FEATURE_EXT_texture_sRGB */
1346
1347    _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
1348    return NULL;
1349 }
1350
1351
1352
1353 /**
1354  * Return datatype and number of components per texel for the given gl_format.
1355  */
1356 void
1357 _mesa_format_to_type_and_comps(gl_format format,
1358                                GLenum *datatype, GLuint *comps)
1359 {
1360    switch (format) {
1361    case MESA_FORMAT_RGBA8888:
1362    case MESA_FORMAT_RGBA8888_REV:
1363    case MESA_FORMAT_ARGB8888:
1364    case MESA_FORMAT_ARGB8888_REV:
1365       *datatype = CHAN_TYPE;
1366       *comps = 4;
1367       return;
1368    case MESA_FORMAT_RGB888:
1369    case MESA_FORMAT_BGR888:
1370       *datatype = GL_UNSIGNED_BYTE;
1371       *comps = 3;
1372       return;
1373    case MESA_FORMAT_RGB565:
1374    case MESA_FORMAT_RGB565_REV:
1375       *datatype = GL_UNSIGNED_SHORT_5_6_5;
1376       *comps = 3;
1377       return;
1378
1379    case MESA_FORMAT_ARGB4444:
1380    case MESA_FORMAT_ARGB4444_REV:
1381       *datatype = GL_UNSIGNED_SHORT_4_4_4_4;
1382       *comps = 4;
1383       return;
1384
1385    case MESA_FORMAT_ARGB1555:
1386    case MESA_FORMAT_ARGB1555_REV:
1387       *datatype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
1388       *comps = 4;
1389       return;
1390
1391    case MESA_FORMAT_AL88:
1392    case MESA_FORMAT_AL88_REV:
1393       *datatype = GL_UNSIGNED_BYTE;
1394       *comps = 2;
1395       return;
1396    case MESA_FORMAT_RGB332:
1397       *datatype = GL_UNSIGNED_BYTE_3_3_2;
1398       *comps = 3;
1399       return;
1400
1401    case MESA_FORMAT_A8:
1402    case MESA_FORMAT_L8:
1403    case MESA_FORMAT_I8:
1404    case MESA_FORMAT_CI8:
1405       *datatype = GL_UNSIGNED_BYTE;
1406       *comps = 1;
1407       return;
1408
1409    case MESA_FORMAT_YCBCR:
1410    case MESA_FORMAT_YCBCR_REV:
1411       *datatype = GL_UNSIGNED_SHORT;
1412       *comps = 2;
1413       return;
1414
1415    case MESA_FORMAT_Z24_S8:
1416       *datatype = GL_UNSIGNED_INT;
1417       *comps = 1; /* XXX OK? */
1418       return;
1419
1420    case MESA_FORMAT_S8_Z24:
1421       *datatype = GL_UNSIGNED_INT;
1422       *comps = 1; /* XXX OK? */
1423       return;
1424
1425    case MESA_FORMAT_Z16:
1426       *datatype = GL_UNSIGNED_SHORT;
1427       *comps = 1;
1428       return;
1429
1430    case MESA_FORMAT_Z32:
1431       *datatype = GL_UNSIGNED_INT;
1432       *comps = 1;
1433       return;
1434
1435    case MESA_FORMAT_DUDV8:
1436       *datatype = GL_BYTE;
1437       *comps = 2;
1438       return;
1439
1440    case MESA_FORMAT_SIGNED_RGBA8888:
1441    case MESA_FORMAT_SIGNED_RGBA8888_REV:
1442       *datatype = GL_BYTE;
1443       *comps = 4;
1444       return;
1445
1446 #if FEATURE_EXT_texture_sRGB
1447    case MESA_FORMAT_SRGB8:
1448       *datatype = GL_UNSIGNED_BYTE;
1449       *comps = 3;
1450       return;
1451    case MESA_FORMAT_SRGBA8:
1452    case MESA_FORMAT_SARGB8:
1453       *datatype = GL_UNSIGNED_BYTE;
1454       *comps = 4;
1455       return;
1456    case MESA_FORMAT_SL8:
1457       *datatype = GL_UNSIGNED_BYTE;
1458       *comps = 1;
1459       return;
1460    case MESA_FORMAT_SLA8:
1461       *datatype = GL_UNSIGNED_BYTE;
1462       *comps = 2;
1463       return;
1464 #endif
1465
1466 #if FEATURE_texture_fxt1
1467    case MESA_FORMAT_RGB_FXT1:
1468    case MESA_FORMAT_RGBA_FXT1:
1469 #endif
1470 #if FEATURE_texture_s3tc
1471    case MESA_FORMAT_RGB_DXT1:
1472    case MESA_FORMAT_RGBA_DXT1:
1473    case MESA_FORMAT_RGBA_DXT3:
1474    case MESA_FORMAT_RGBA_DXT5:
1475 #if FEATURE_EXT_texture_sRGB
1476    case MESA_FORMAT_SRGB_DXT1:
1477    case MESA_FORMAT_SRGBA_DXT1:
1478    case MESA_FORMAT_SRGBA_DXT3:
1479    case MESA_FORMAT_SRGBA_DXT5:
1480 #endif
1481       /* XXX generate error instead? */
1482       *datatype = GL_UNSIGNED_BYTE;
1483       *comps = 0;
1484       return;
1485 #endif
1486
1487    case MESA_FORMAT_RGBA:
1488       *datatype = CHAN_TYPE;
1489       *comps = 4;
1490       return;
1491    case MESA_FORMAT_RGB:
1492       *datatype = CHAN_TYPE;
1493       *comps = 3;
1494       return;
1495    case MESA_FORMAT_LUMINANCE_ALPHA:
1496       *datatype = CHAN_TYPE;
1497       *comps = 2;
1498       return;
1499    case MESA_FORMAT_ALPHA:
1500    case MESA_FORMAT_LUMINANCE:
1501    case MESA_FORMAT_INTENSITY:
1502       *datatype = CHAN_TYPE;
1503       *comps = 1;
1504       return;
1505
1506    case MESA_FORMAT_RGBA_FLOAT32:
1507       *datatype = GL_FLOAT;
1508       *comps = 4;
1509       return;
1510    case MESA_FORMAT_RGBA_FLOAT16:
1511       *datatype = GL_HALF_FLOAT_ARB;
1512       *comps = 4;
1513       return;
1514    case MESA_FORMAT_RGB_FLOAT32:
1515       *datatype = GL_FLOAT;
1516       *comps = 3;
1517       return;
1518    case MESA_FORMAT_RGB_FLOAT16:
1519       *datatype = GL_HALF_FLOAT_ARB;
1520       *comps = 3;
1521       return;
1522    case MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32:
1523       *datatype = GL_FLOAT;
1524       *comps = 2;
1525       return;
1526    case MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16:
1527       *datatype = GL_HALF_FLOAT_ARB;
1528       *comps = 2;
1529       return;
1530    case MESA_FORMAT_ALPHA_FLOAT32:
1531    case MESA_FORMAT_LUMINANCE_FLOAT32:
1532    case MESA_FORMAT_INTENSITY_FLOAT32:
1533       *datatype = GL_FLOAT;
1534       *comps = 1;
1535       return;
1536    case MESA_FORMAT_ALPHA_FLOAT16:
1537    case MESA_FORMAT_LUMINANCE_FLOAT16:
1538    case MESA_FORMAT_INTENSITY_FLOAT16:
1539       *datatype = GL_HALF_FLOAT_ARB;
1540       *comps = 1;
1541       return;
1542
1543    default:
1544       _mesa_problem(NULL, "bad format in _mesa_format_to_type_and_comps");
1545       *datatype = 0;
1546       *comps = 1;
1547    }
1548 }
1549
1550
1551
1552 /**
1553  * Table to map MESA_FORMAT_ to texel fetch/store funcs.
1554  * XXX this is somewhat temporary.
1555  */
1556 static struct {
1557    GLuint Name;
1558    FetchTexelFuncF Fetch1D;
1559    FetchTexelFuncF Fetch2D;
1560    FetchTexelFuncF Fetch3D;
1561    StoreTexelFunc StoreTexel;
1562 }
1563 texfetch_funcs[MESA_FORMAT_COUNT] =
1564 {
1565    {
1566       MESA_FORMAT_RGBA,
1567       fetch_texel_1d_f_rgba,
1568       fetch_texel_2d_f_rgba,
1569       fetch_texel_3d_f_rgba,
1570       store_texel_rgba
1571    },
1572    {
1573       MESA_FORMAT_RGB,
1574       fetch_texel_1d_f_rgb,
1575       fetch_texel_2d_f_rgb,
1576       fetch_texel_3d_f_rgb,
1577       store_texel_rgb
1578    },
1579    {
1580       MESA_FORMAT_ALPHA,
1581       fetch_texel_1d_f_alpha,
1582       fetch_texel_2d_f_alpha,
1583       fetch_texel_3d_f_alpha,
1584       store_texel_alpha
1585    },
1586    {
1587       MESA_FORMAT_LUMINANCE,
1588       fetch_texel_1d_f_luminance,
1589       fetch_texel_2d_f_luminance,
1590       fetch_texel_3d_f_luminance,
1591       store_texel_luminance
1592    },
1593    {
1594       MESA_FORMAT_LUMINANCE_ALPHA,
1595       fetch_texel_1d_f_luminance_alpha,
1596       fetch_texel_2d_f_luminance_alpha,
1597       fetch_texel_3d_f_luminance_alpha,
1598       store_texel_luminance_alpha
1599    },
1600    {
1601       MESA_FORMAT_INTENSITY,
1602       fetch_texel_1d_f_intensity,
1603       fetch_texel_2d_f_intensity,
1604       fetch_texel_3d_f_intensity,
1605       store_texel_intensity
1606    },
1607    {
1608       MESA_FORMAT_SRGB8,
1609       fetch_texel_1d_srgb8,
1610       fetch_texel_2d_srgb8,
1611       fetch_texel_3d_srgb8,
1612       store_texel_srgb8
1613    },
1614    {
1615       MESA_FORMAT_SRGBA8,
1616       fetch_texel_1d_srgba8,
1617       fetch_texel_2d_srgba8,
1618       fetch_texel_3d_srgba8,
1619       store_texel_srgba8
1620    },
1621    {
1622       MESA_FORMAT_SARGB8,
1623       fetch_texel_1d_sargb8,
1624       fetch_texel_2d_sargb8,
1625       fetch_texel_3d_sargb8,
1626       store_texel_sargb8
1627    },
1628    {
1629       MESA_FORMAT_SL8,
1630       fetch_texel_1d_sl8,
1631       fetch_texel_2d_sl8,
1632       fetch_texel_3d_sl8,
1633       store_texel_sl8
1634    },
1635    {
1636       MESA_FORMAT_SLA8,
1637       fetch_texel_1d_sla8,
1638       fetch_texel_2d_sla8,
1639       fetch_texel_3d_sla8,
1640       store_texel_sla8
1641    },
1642    {
1643       MESA_FORMAT_RGB_FXT1,
1644       NULL,
1645       _mesa_fetch_texel_2d_f_rgb_fxt1,
1646       NULL,
1647       NULL
1648    },
1649    {
1650       MESA_FORMAT_RGBA_FXT1,
1651       NULL,
1652       _mesa_fetch_texel_2d_f_rgba_fxt1,
1653       NULL,
1654       NULL
1655    },
1656    {
1657       MESA_FORMAT_RGB_DXT1,
1658       NULL,
1659       _mesa_fetch_texel_2d_f_rgb_dxt1,
1660       NULL,
1661       NULL
1662    },
1663    {
1664       MESA_FORMAT_RGBA_DXT1,
1665       NULL,
1666       _mesa_fetch_texel_2d_f_rgba_dxt1,
1667       NULL,
1668       NULL
1669    },
1670    {
1671       MESA_FORMAT_RGBA_DXT3,
1672       NULL,
1673       _mesa_fetch_texel_2d_f_rgba_dxt3,
1674       NULL,
1675       NULL
1676    },
1677    {
1678       MESA_FORMAT_RGBA_DXT5,
1679       NULL,
1680       _mesa_fetch_texel_2d_f_rgba_dxt5,
1681       NULL,
1682       NULL
1683    },
1684    {
1685       MESA_FORMAT_SRGB_DXT1,
1686       NULL,
1687       _mesa_fetch_texel_2d_f_srgb_dxt1,
1688       NULL,
1689       NULL
1690    },
1691    {
1692       MESA_FORMAT_SRGBA_DXT1,
1693       NULL,
1694       _mesa_fetch_texel_2d_f_srgba_dxt1,
1695       NULL,
1696       NULL
1697    },
1698    {
1699       MESA_FORMAT_SRGBA_DXT3,
1700       NULL,
1701       _mesa_fetch_texel_2d_f_srgba_dxt3,
1702       NULL,
1703       NULL
1704    },
1705    {
1706       MESA_FORMAT_SRGBA_DXT5,
1707       NULL,
1708       _mesa_fetch_texel_2d_f_srgba_dxt5,
1709       NULL,
1710       NULL
1711    },
1712    {
1713       MESA_FORMAT_RGBA_FLOAT32,
1714       fetch_texel_1d_f_rgba_f32,
1715       fetch_texel_2d_f_rgba_f32,
1716       fetch_texel_3d_f_rgba_f32,
1717       store_texel_rgba_f32
1718    },
1719    {
1720       MESA_FORMAT_RGBA_FLOAT16,
1721       fetch_texel_1d_f_rgba_f16,
1722       fetch_texel_2d_f_rgba_f16,
1723       fetch_texel_3d_f_rgba_f16,
1724       store_texel_rgba_f16
1725    },
1726    {
1727       MESA_FORMAT_RGB_FLOAT32,
1728       fetch_texel_1d_f_rgb_f32,
1729       fetch_texel_2d_f_rgb_f32,
1730       fetch_texel_3d_f_rgb_f32,
1731       store_texel_rgb_f32
1732    },
1733    {
1734       MESA_FORMAT_RGB_FLOAT16,
1735       fetch_texel_1d_f_rgb_f16,
1736       fetch_texel_2d_f_rgb_f16,
1737       fetch_texel_3d_f_rgb_f16,
1738       store_texel_rgb_f16
1739    },
1740    {
1741       MESA_FORMAT_ALPHA_FLOAT32,
1742       fetch_texel_1d_f_alpha_f32,
1743       fetch_texel_2d_f_alpha_f32,
1744       fetch_texel_3d_f_alpha_f32,
1745       store_texel_alpha_f32
1746    },
1747    {
1748       MESA_FORMAT_ALPHA_FLOAT16,
1749       fetch_texel_1d_f_alpha_f16,
1750       fetch_texel_2d_f_alpha_f16,
1751       fetch_texel_3d_f_alpha_f16,
1752       store_texel_alpha_f16
1753    },
1754    {
1755       MESA_FORMAT_LUMINANCE_FLOAT32,
1756       fetch_texel_1d_f_luminance_f32,
1757       fetch_texel_2d_f_luminance_f32,
1758       fetch_texel_3d_f_luminance_f32,
1759       store_texel_luminance_f32
1760    },
1761    {
1762       MESA_FORMAT_LUMINANCE_FLOAT16,
1763       fetch_texel_1d_f_luminance_f16,
1764       fetch_texel_2d_f_luminance_f16,
1765       fetch_texel_3d_f_luminance_f16,
1766       store_texel_luminance_f16
1767    },
1768    {
1769       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32,
1770       fetch_texel_1d_f_luminance_alpha_f32,
1771       fetch_texel_2d_f_luminance_alpha_f32,
1772       fetch_texel_3d_f_luminance_alpha_f32,
1773       store_texel_luminance_alpha_f32
1774    },
1775    {
1776       MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16,
1777       fetch_texel_1d_f_luminance_alpha_f16,
1778       fetch_texel_2d_f_luminance_alpha_f16,
1779       fetch_texel_3d_f_luminance_alpha_f16,
1780       store_texel_luminance_alpha_f16
1781    },
1782    {
1783       MESA_FORMAT_INTENSITY_FLOAT32,
1784       fetch_texel_1d_f_intensity_f32,
1785       fetch_texel_2d_f_intensity_f32,
1786       fetch_texel_3d_f_intensity_f32,
1787       store_texel_intensity_f32
1788    },
1789    {
1790       MESA_FORMAT_INTENSITY_FLOAT16,
1791       fetch_texel_1d_f_intensity_f16,
1792       fetch_texel_2d_f_intensity_f16,
1793       fetch_texel_3d_f_intensity_f16,
1794       store_texel_intensity_f16
1795    },
1796    {
1797       MESA_FORMAT_DUDV8,
1798       fetch_texel_1d_dudv8,
1799       fetch_texel_2d_dudv8,
1800       fetch_texel_3d_dudv8,
1801       NULL
1802    },
1803    {
1804       MESA_FORMAT_SIGNED_RGBA8888,
1805       fetch_texel_1d_signed_rgba8888,
1806       fetch_texel_2d_signed_rgba8888,
1807       fetch_texel_3d_signed_rgba8888,
1808       store_texel_signed_rgba8888
1809    },
1810    {
1811       MESA_FORMAT_SIGNED_RGBA8888_REV,
1812       fetch_texel_1d_signed_rgba8888_rev,
1813       fetch_texel_2d_signed_rgba8888_rev,
1814       fetch_texel_3d_signed_rgba8888_rev,
1815       store_texel_signed_rgba8888_rev
1816    },
1817    {
1818       MESA_FORMAT_RGBA8888,
1819       fetch_texel_1d_f_rgba8888,
1820       fetch_texel_2d_f_rgba8888,
1821       fetch_texel_3d_f_rgba8888,
1822       store_texel_rgba8888
1823    },
1824    {
1825       MESA_FORMAT_RGBA8888_REV,
1826       fetch_texel_1d_f_rgba8888_rev,
1827       fetch_texel_2d_f_rgba8888_rev,
1828       fetch_texel_3d_f_rgba8888_rev,
1829       store_texel_rgba8888_rev
1830    },
1831    {
1832       MESA_FORMAT_ARGB8888,
1833       fetch_texel_1d_f_argb8888,
1834       fetch_texel_2d_f_argb8888,
1835       fetch_texel_3d_f_argb8888,
1836       store_texel_argb8888
1837    },
1838    {
1839       MESA_FORMAT_ARGB8888_REV,
1840       fetch_texel_1d_f_argb8888_rev,
1841       fetch_texel_2d_f_argb8888_rev,
1842       fetch_texel_3d_f_argb8888_rev,
1843       store_texel_argb8888_rev
1844    },
1845    {
1846       MESA_FORMAT_RGB888,
1847       fetch_texel_1d_f_rgb888,
1848       fetch_texel_2d_f_rgb888,
1849       fetch_texel_3d_f_rgb888,
1850       store_texel_rgb888
1851    },
1852    {
1853       MESA_FORMAT_BGR888,
1854       fetch_texel_1d_f_bgr888,
1855       fetch_texel_2d_f_bgr888,
1856       fetch_texel_3d_f_bgr888,
1857       store_texel_bgr888
1858    },
1859    {
1860       MESA_FORMAT_RGB565,
1861       fetch_texel_1d_f_rgb565,
1862       fetch_texel_2d_f_rgb565,
1863       fetch_texel_3d_f_rgb565,
1864       store_texel_rgb565
1865    },
1866    {
1867       MESA_FORMAT_RGB565_REV,
1868       fetch_texel_1d_f_rgb565_rev,
1869       fetch_texel_2d_f_rgb565_rev,
1870       fetch_texel_3d_f_rgb565_rev,
1871       store_texel_rgb565_rev
1872    },
1873    {
1874       MESA_FORMAT_RGBA4444,
1875       fetch_texel_1d_f_rgba4444,
1876       fetch_texel_2d_f_rgba4444,
1877       fetch_texel_3d_f_rgba4444,
1878       store_texel_rgba4444
1879    },
1880    {
1881       MESA_FORMAT_ARGB4444,
1882       fetch_texel_1d_f_argb4444,
1883       fetch_texel_2d_f_argb4444,
1884       fetch_texel_3d_f_argb4444,
1885       store_texel_argb4444
1886    },
1887    {
1888       MESA_FORMAT_ARGB4444_REV,
1889       fetch_texel_1d_f_argb4444_rev,
1890       fetch_texel_2d_f_argb4444_rev,
1891       fetch_texel_3d_f_argb4444_rev,
1892       store_texel_argb4444_rev
1893    },
1894    {
1895       MESA_FORMAT_RGBA5551,
1896       fetch_texel_1d_f_rgba5551,
1897       fetch_texel_2d_f_rgba5551,
1898       fetch_texel_3d_f_rgba5551,
1899       store_texel_rgba5551
1900    },
1901    {
1902       MESA_FORMAT_ARGB1555,
1903       fetch_texel_1d_f_argb1555,
1904       fetch_texel_2d_f_argb1555,
1905       fetch_texel_3d_f_argb1555,
1906       store_texel_argb1555
1907    },
1908    {
1909       MESA_FORMAT_ARGB1555_REV,
1910       fetch_texel_1d_f_argb1555_rev,
1911       fetch_texel_2d_f_argb1555_rev,
1912       fetch_texel_3d_f_argb1555_rev,
1913       store_texel_argb1555_rev
1914    },
1915    {
1916       MESA_FORMAT_AL88,
1917       fetch_texel_1d_f_al88,
1918       fetch_texel_2d_f_al88,
1919       fetch_texel_3d_f_al88,
1920       store_texel_al88
1921    },
1922    {
1923       MESA_FORMAT_AL88_REV,
1924       fetch_texel_1d_f_al88_rev,
1925       fetch_texel_2d_f_al88_rev,
1926       fetch_texel_3d_f_al88_rev,
1927       store_texel_al88_rev
1928    },
1929    {
1930       MESA_FORMAT_RGB332,
1931       fetch_texel_1d_f_rgb332,
1932       fetch_texel_2d_f_rgb332,
1933       fetch_texel_3d_f_rgb332,
1934       store_texel_rgb332
1935    },
1936    {
1937       MESA_FORMAT_A8,
1938       fetch_texel_1d_f_a8,
1939       fetch_texel_2d_f_a8,
1940       fetch_texel_3d_f_a8,
1941       store_texel_a8
1942    },
1943    {
1944       MESA_FORMAT_L8,
1945       fetch_texel_1d_f_l8,
1946       fetch_texel_2d_f_l8,
1947       fetch_texel_3d_f_l8,
1948       store_texel_l8
1949    },
1950    {
1951       MESA_FORMAT_I8,
1952       fetch_texel_1d_f_i8,
1953       fetch_texel_2d_f_i8,
1954       fetch_texel_3d_f_i8,
1955       store_texel_i8
1956    },
1957    {
1958       MESA_FORMAT_CI8,
1959       fetch_texel_1d_f_ci8,
1960       fetch_texel_2d_f_ci8,
1961       fetch_texel_3d_f_ci8,
1962       store_texel_ci8
1963    },
1964    {
1965       MESA_FORMAT_YCBCR,
1966       fetch_texel_1d_f_ycbcr,
1967       fetch_texel_2d_f_ycbcr,
1968       fetch_texel_3d_f_ycbcr,
1969       store_texel_ycbcr
1970    },
1971    {
1972       MESA_FORMAT_YCBCR_REV,
1973       fetch_texel_1d_f_ycbcr_rev,
1974       fetch_texel_2d_f_ycbcr_rev,
1975       fetch_texel_3d_f_ycbcr_rev,
1976       store_texel_ycbcr_rev
1977    },
1978    {
1979       MESA_FORMAT_Z24_S8,
1980       fetch_texel_1d_f_z24_s8,
1981       fetch_texel_2d_f_z24_s8,
1982       fetch_texel_3d_f_z24_s8,
1983       store_texel_z24_s8
1984    },
1985    {
1986       MESA_FORMAT_S8_Z24,
1987       fetch_texel_1d_f_s8_z24,
1988       fetch_texel_2d_f_s8_z24,
1989       fetch_texel_3d_f_s8_z24,
1990       store_texel_s8_z24
1991    },
1992    {
1993       MESA_FORMAT_Z16,
1994       fetch_texel_1d_f_z16,
1995       fetch_texel_2d_f_z16,
1996       fetch_texel_3d_f_z16,
1997       store_texel_z16
1998    },
1999    {
2000       MESA_FORMAT_Z32,
2001       fetch_texel_1d_f_z32,
2002       fetch_texel_2d_f_z32,
2003       fetch_texel_3d_f_z32,
2004       store_texel_z32
2005    }
2006 };
2007
2008
2009 FetchTexelFuncF
2010 _mesa_get_texel_fetch_func(GLuint format, GLuint dims)
2011 {
2012    FetchTexelFuncF f;
2013    GLuint i;
2014    /* XXX replace loop with direct table lookup */
2015    for (i = 0; i < MESA_FORMAT_COUNT; i++) {
2016       if (texfetch_funcs[i].Name == format) {
2017          switch (dims) {
2018          case 1:
2019             f = texfetch_funcs[i].Fetch1D;
2020             break;
2021          case 2:
2022             f = texfetch_funcs[i].Fetch2D;
2023             break;
2024          case 3:
2025             f = texfetch_funcs[i].Fetch3D;
2026             break;
2027          }
2028          if (!f)
2029             f = fetch_null_texelf;
2030          return f;
2031       }
2032    }
2033    return NULL;
2034 }
2035
2036
2037 StoreTexelFunc
2038 _mesa_get_texel_store_func(GLuint format)
2039 {
2040    GLuint i;
2041    /* XXX replace loop with direct table lookup */
2042    for (i = 0; i < MESA_FORMAT_COUNT; i++) {
2043       if (texfetch_funcs[i].Name == format) {
2044          if (texfetch_funcs[i].StoreTexel)
2045             return texfetch_funcs[i].StoreTexel;
2046          else
2047             return store_null_texel;
2048       }
2049    }
2050    return NULL;
2051 }