src/mesa/main/texformat.c

   1 /* $Id: texformat.c,v 1.7 2001/03/30 14:44:43 gareth Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * Author:
  27  *    Gareth Hughes <gareth@valinux.com>
  28  */
  29
  30 #ifdef PC_HEADER
  31 #include "all.h"
  32 #else
  33 #include "glheader.h"
  34 #include "colormac.h"
  35 #include "context.h"
  36 #include "image.h"
  37 #include "mem.h"
  38 #include "mmath.h"
  39 #include "mtypes.h"
  40 #include "texformat.h"
  41 #include "teximage.h"
  42 #include "texstate.h"
  43 #include "swrast/s_span.h"
  44 #endif
  45
  46
  47 /* Texel fetch routines for all supported formats:
  48  */
  49 #define DIM 1
  50 #include "texformat_tmp.h"
  51
  52 #define DIM 2
  53 #include "texformat_tmp.h"
  54
  55 #define DIM 3
  56 #include "texformat_tmp.h"
  57
  58 /* Have to have this so the FetchTexel function pointer is never NULL.
  59  */
  60 static void fetch_null_texel( const struct gl_texture_image *texImage,
  61                               GLint i, GLint j, GLint k, GLvoid *texel )
  62 {
  63    GLchan *rgba = (GLchan *) texel;
  64    rgba[RCOMP] = 0;
  65    rgba[GCOMP] = 0;
  66    rgba[BCOMP] = 0;
  67    rgba[ACOMP] = 0;
  68 }
  69
  70
  71 /* =============================================================
  72  * Default GLchan-based formats:
  73  */
  74
  75 const struct gl_texture_format _mesa_texformat_rgba = {
  76    MESA_FORMAT_RGBA,                    /* MesaFormat */
  77    GL_RGBA,                             /* IntFormat */
  78    CHAN_TYPE,                           /* Type */
  79    CHAN_BITS,                           /* RedBits */
  80    CHAN_BITS,                           /* GreenBits */
  81    CHAN_BITS,                           /* BlueBits */
  82    CHAN_BITS,                           /* AlphaBits */
  83    0,                                   /* LuminanceBits */
  84    0,                                   /* IntensityBits */
  85    0,                                   /* IndexBits */
  86    0,                                   /* DepthBits */
  87    4 * CHAN_BITS / 8,                   /* TexelBytes */
  88    fetch_1d_texel_rgba,                 /* FetchTexel1D */
  89    fetch_2d_texel_rgba,                 /* FetchTexel2D */
  90    fetch_3d_texel_rgba,                 /* FetchTexel3D */
  91 };
  92
  93 const struct gl_texture_format _mesa_texformat_rgb = {
  94    MESA_FORMAT_RGB,                     /* MesaFormat */
  95    GL_RGB,                              /* IntFormat */
  96    CHAN_TYPE,                           /* Type */
  97    CHAN_BITS,                           /* RedBits */
  98    CHAN_BITS,                           /* GreenBits */
  99    CHAN_BITS,                           /* BlueBits */
 100    0,                                   /* AlphaBits */
 101    0,                                   /* LuminanceBits */
 102    0,                                   /* IntensityBits */
 103    0,                                   /* IndexBits */
 104    0,                                   /* DepthBits */
 105    3 * CHAN_BITS / 8,                   /* TexelBytes */
 106    fetch_1d_texel_rgb,                  /* FetchTexel1D */
 107    fetch_2d_texel_rgb,                  /* FetchTexel2D */
 108    fetch_3d_texel_rgb,                  /* FetchTexel3D */
 109 };
 110
 111 const struct gl_texture_format _mesa_texformat_alpha = {
 112    MESA_FORMAT_ALPHA,                   /* MesaFormat */
 113    GL_ALPHA,                            /* IntFormat */
 114    CHAN_TYPE,                           /* Type */
 115    0,                                   /* RedBits */
 116    0,                                   /* GreenBits */
 117    0,                                   /* BlueBits */
 118    CHAN_BITS,                           /* AlphaBits */
 119    0,                                   /* LuminanceBits */
 120    0,                                   /* IntensityBits */
 121    0,                                   /* IndexBits */
 122    0,                                   /* DepthBits */
 123    CHAN_BITS / 8,                       /* TexelBytes */
 124    fetch_1d_texel_alpha,                /* FetchTexel1D */
 125    fetch_2d_texel_alpha,                /* FetchTexel2D */
 126    fetch_3d_texel_alpha,                /* FetchTexel3D */
 127 };
 128
 129 const struct gl_texture_format _mesa_texformat_luminance = {
 130    MESA_FORMAT_LUMINANCE,               /* MesaFormat */
 131    GL_LUMINANCE,                        /* IntFormat */
 132    CHAN_TYPE,                           /* Type */
 133    0,                                   /* RedBits */
 134    0,                                   /* GreenBits */
 135    0,                                   /* BlueBits */
 136    0,                                   /* AlphaBits */
 137    CHAN_BITS,                           /* LuminanceBits */
 138    0,                                   /* IntensityBits */
 139    0,                                   /* IndexBits */
 140    0,                                   /* DepthBits */
 141    CHAN_BITS / 8,                       /* TexelBytes */
 142    fetch_1d_texel_luminance,            /* FetchTexel1D */
 143    fetch_2d_texel_luminance,            /* FetchTexel2D */
 144    fetch_3d_texel_luminance,            /* FetchTexel3D */
 145 };
 146
 147 const struct gl_texture_format _mesa_texformat_luminance_alpha = {
 148    MESA_FORMAT_LUMINANCE_ALPHA,         /* MesaFormat */
 149    GL_LUMINANCE_ALPHA,                  /* IntFormat */
 150    CHAN_TYPE,                           /* Type */
 151    0,                                   /* RedBits */
 152    0,                                   /* GreenBits */
 153    0,                                   /* BlueBits */
 154    CHAN_BITS,                           /* AlphaBits */
 155    CHAN_BITS,                           /* LuminanceBits */
 156    0,                                   /* IntensityBits */
 157    0,                                   /* IndexBits */
 158    0,                                   /* DepthBits */
 159    2 * CHAN_BITS / 8,                   /* TexelBytes */
 160    fetch_1d_texel_luminance_alpha,      /* FetchTexel1D */
 161    fetch_2d_texel_luminance_alpha,      /* FetchTexel2D */
 162    fetch_3d_texel_luminance_alpha,      /* FetchTexel3D */
 163 };
 164
 165 const struct gl_texture_format _mesa_texformat_intensity = {
 166    MESA_FORMAT_INTENSITY,               /* MesaFormat */
 167    GL_INTENSITY,                        /* IntFormat */
 168    CHAN_TYPE,                           /* Type */
 169    0,                                   /* RedBits */
 170    0,                                   /* GreenBits */
 171    0,                                   /* BlueBits */
 172    0,                                   /* AlphaBits */
 173    0,                                   /* LuminanceBits */
 174    CHAN_BITS,                           /* IntensityBits */
 175    0,                                   /* IndexBits */
 176    0,                                   /* DepthBits */
 177    CHAN_BITS / 8,                       /* TexelBytes */
 178    fetch_1d_texel_intensity,            /* FetchTexel1D */
 179    fetch_2d_texel_intensity,            /* FetchTexel2D */
 180    fetch_3d_texel_intensity,            /* FetchTexel3D */
 181 };
 182
 183 const struct gl_texture_format _mesa_texformat_color_index = {
 184    MESA_FORMAT_COLOR_INDEX,             /* MesaFormat */
 185    GL_COLOR_INDEX,                      /* IntFormat */
 186    CHAN_TYPE,                           /* Type */
 187    0,                                   /* RedBits */
 188    0,                                   /* GreenBits */
 189    0,                                   /* BlueBits */
 190    0,                                   /* AlphaBits */
 191    0,                                   /* LuminanceBits */
 192    0,                                   /* IntensityBits */
 193    CHAN_BITS,                           /* IndexBits */
 194    0,                                   /* DepthBits */
 195    CHAN_BITS / 8,                       /* TexelBytes */
 196    fetch_1d_texel_color_index,          /* FetchTexel1D */
 197    fetch_2d_texel_color_index,          /* FetchTexel2D */
 198    fetch_3d_texel_color_index,          /* FetchTexel3D */
 199 };
 200
 201 const struct gl_texture_format _mesa_texformat_depth_component = {
 202    MESA_FORMAT_DEPTH_COMPONENT,         /* MesaFormat */
 203    GL_DEPTH_COMPONENT,                  /* IntFormat */
 204    GL_FLOAT,                            /* Type */
 205    0,                                   /* RedBits */
 206    0,                                   /* GreenBits */
 207    0,                                   /* BlueBits */
 208    0,                                   /* AlphaBits */
 209    0,                                   /* LuminanceBits */
 210    0,                                   /* IntensityBits */
 211    0,                                   /* IndexBits */
 212    sizeof(GLfloat) * 8,                 /* DepthBits */
 213    sizeof(GLfloat),                     /* TexelBytes */
 214    fetch_1d_texel_depth_component,      /* FetchTexel1D */
 215    fetch_2d_texel_depth_component,      /* FetchTexel2D */
 216    fetch_3d_texel_depth_component,      /* FetchTexel3D */
 217 };
 218
 219
 220 /* =============================================================
 221  * Hardware formats:
 222  */
 223
 224 const struct gl_texture_format _mesa_texformat_rgba8888 = {
 225    MESA_FORMAT_RGBA8888,                /* MesaFormat */
 226    GL_RGBA,                             /* IntFormat */
 227    GL_UNSIGNED_INT_8_8_8_8,             /* Type */
 228    8,                                   /* RedBits */
 229    8,                                   /* GreenBits */
 230    8,                                   /* BlueBits */
 231    8,                                   /* AlphaBits */
 232    0,                                   /* LuminanceBits */
 233    0,                                   /* IntensityBits */
 234    0,                                   /* IndexBits */
 235    0,                                   /* DepthBits */
 236    4,                                   /* TexelBytes */
 237    fetch_1d_texel_rgba8888,             /* FetchTexel1D */
 238    fetch_2d_texel_rgba8888,             /* FetchTexel2D */
 239    fetch_3d_texel_rgba8888,             /* FetchTexel3D */
 240 };
 241
 242 const struct gl_texture_format _mesa_texformat_argb8888 = {
 243    MESA_FORMAT_ARGB8888,                /* MesaFormat */
 244    GL_BGRA,                             /* IntFormat */
 245    GL_UNSIGNED_INT_8_8_8_8_REV,         /* Type */
 246    8,                                   /* RedBits */
 247    8,                                   /* GreenBits */
 248    8,                                   /* BlueBits */
 249    8,                                   /* AlphaBits */
 250    0,                                   /* LuminanceBits */
 251    0,                                   /* IntensityBits */
 252    0,                                   /* IndexBits */
 253    0,                                   /* DepthBits */
 254    4,                                   /* TexelBytes */
 255    fetch_1d_texel_argb8888,             /* FetchTexel1D */
 256    fetch_2d_texel_argb8888,             /* FetchTexel2D */
 257    fetch_3d_texel_argb8888,             /* FetchTexel3D */
 258 };
 259
 260 const struct gl_texture_format _mesa_texformat_rgb888 = {
 261    MESA_FORMAT_RGB888,                  /* MesaFormat */
 262    GL_BGR,                              /* IntFormat */
 263    GL_UNSIGNED_BYTE,                    /* Type */
 264    8,                                   /* RedBits */
 265    8,                                   /* GreenBits */
 266    8,                                   /* BlueBits */
 267    0,                                   /* AlphaBits */
 268    0,                                   /* LuminanceBits */
 269    0,                                   /* IntensityBits */
 270    0,                                   /* IndexBits */
 271    0,                                   /* DepthBits */
 272    3,                                   /* TexelBytes */
 273    fetch_1d_texel_rgb888,               /* FetchTexel1D */
 274    fetch_2d_texel_rgb888,               /* FetchTexel2D */
 275    fetch_3d_texel_rgb888,               /* FetchTexel3D */
 276 };
 277
 278 const struct gl_texture_format _mesa_texformat_rgb565 = {
 279    MESA_FORMAT_RGB565,                  /* MesaFormat */
 280    GL_RGB,                              /* IntFormat */
 281    GL_UNSIGNED_SHORT_5_6_5,             /* Type */
 282    5,                                   /* RedBits */
 283    6,                                   /* GreenBits */
 284    5,                                   /* BlueBits */
 285    0,                                   /* AlphaBits */
 286    0,                                   /* LuminanceBits */
 287    0,                                   /* IntensityBits */
 288    0,                                   /* IndexBits */
 289    0,                                   /* DepthBits */
 290    2,                                   /* TexelBytes */
 291    fetch_1d_texel_rgb565,               /* FetchTexel1D */
 292    fetch_2d_texel_rgb565,               /* FetchTexel2D */
 293    fetch_3d_texel_rgb565,               /* FetchTexel3D */
 294 };
 295
 296 const struct gl_texture_format _mesa_texformat_argb4444 = {
 297    MESA_FORMAT_ARGB4444,                /* MesaFormat */
 298    GL_BGRA,                             /* IntFormat */
 299    GL_UNSIGNED_SHORT_4_4_4_4_REV,       /* Type */
 300    4,                                   /* RedBits */
 301    4,                                   /* GreenBits */
 302    4,                                   /* BlueBits */
 303    4,                                   /* AlphaBits */
 304    0,                                   /* LuminanceBits */
 305    0,                                   /* IntensityBits */
 306    0,                                   /* IndexBits */
 307    0,                                   /* DepthBits */
 308    2,                                   /* TexelBytes */
 309    fetch_1d_texel_argb4444,             /* FetchTexel1D */
 310    fetch_2d_texel_argb4444,             /* FetchTexel2D */
 311    fetch_3d_texel_argb4444,             /* FetchTexel3D */
 312 };
 313
 314 const struct gl_texture_format _mesa_texformat_argb1555 = {
 315    MESA_FORMAT_ARGB1555,                /* MesaFormat */
 316    GL_BGRA,                             /* IntFormat */
 317    GL_UNSIGNED_SHORT_1_5_5_5_REV,       /* Type */
 318    5,                                   /* RedBits */
 319    5,                                   /* GreenBits */
 320    5,                                   /* BlueBits */
 321    1,                                   /* AlphaBits */
 322    0,                                   /* LuminanceBits */
 323    0,                                   /* IntensityBits */
 324    0,                                   /* IndexBits */
 325    0,                                   /* DepthBits */
 326    2,                                   /* TexelBytes */
 327    fetch_1d_texel_argb1555,             /* FetchTexel1D */
 328    fetch_2d_texel_argb1555,             /* FetchTexel2D */
 329    fetch_3d_texel_argb1555,             /* FetchTexel3D */
 330 };
 331
 332 const struct gl_texture_format _mesa_texformat_al88 = {
 333    MESA_FORMAT_AL88,                    /* MesaFormat */
 334    GL_LUMINANCE_ALPHA,                  /* IntFormat */
 335    GL_UNSIGNED_BYTE,                    /* Type */
 336    0,                                   /* RedBits */
 337    0,                                   /* GreenBits */
 338    0,                                   /* BlueBits */
 339    8,                                   /* AlphaBits */
 340    8,                                   /* LuminanceBits */
 341    0,                                   /* IntensityBits */
 342    0,                                   /* IndexBits */
 343    0,                                   /* DepthBits */
 344    2,                                   /* TexelBytes */
 345    fetch_1d_texel_al88,                 /* FetchTexel1D */
 346    fetch_2d_texel_al88,                 /* FetchTexel2D */
 347    fetch_3d_texel_al88,                 /* FetchTexel3D */
 348 };
 349
 350 const struct gl_texture_format _mesa_texformat_rgb332 = {
 351    MESA_FORMAT_RGB332,                  /* MesaFormat */
 352    GL_RGB,                              /* IntFormat */
 353    GL_UNSIGNED_BYTE_3_3_2,              /* Type */
 354    3,                                   /* RedBits */
 355    3,                                   /* GreenBits */
 356    2,                                   /* BlueBits */
 357    0,                                   /* AlphaBits */
 358    0,                                   /* LuminanceBits */
 359    0,                                   /* IntensityBits */
 360    0,                                   /* IndexBits */
 361    0,                                   /* DepthBits */
 362    1,                                   /* TexelBytes */
 363    fetch_1d_texel_rgb332,               /* FetchTexel1D */
 364    fetch_2d_texel_rgb332,               /* FetchTexel2D */
 365    fetch_3d_texel_rgb332,               /* FetchTexel3D */
 366 };
 367
 368 const struct gl_texture_format _mesa_texformat_a8 = {
 369    MESA_FORMAT_A8,                      /* MesaFormat */
 370    GL_ALPHA,                            /* IntFormat */
 371    GL_UNSIGNED_BYTE,                    /* Type */
 372    0,                                   /* RedBits */
 373    0,                                   /* GreenBits */
 374    0,                                   /* BlueBits */
 375    8,                                   /* AlphaBits */
 376    0,                                   /* LuminanceBits */
 377    0,                                   /* IntensityBits */
 378    0,                                   /* IndexBits */
 379    0,                                   /* DepthBits */
 380    1,                                   /* TexelBytes */
 381    fetch_1d_texel_a8,                   /* FetchTexel1D */
 382    fetch_2d_texel_a8,                   /* FetchTexel2D */
 383    fetch_3d_texel_a8,                   /* FetchTexel3D */
 384 };
 385
 386 const struct gl_texture_format _mesa_texformat_l8 = {
 387    MESA_FORMAT_L8,                      /* MesaFormat */
 388    GL_LUMINANCE,                        /* IntFormat */
 389    GL_UNSIGNED_BYTE,                    /* Type */
 390    0,                                   /* RedBits */
 391    0,                                   /* GreenBits */
 392    0,                                   /* BlueBits */
 393    0,                                   /* AlphaBits */
 394    8,                                   /* LuminanceBits */
 395    0,                                   /* IntensityBits */
 396    0,                                   /* IndexBits */
 397    0,                                   /* DepthBits */
 398    1,                                   /* TexelBytes */
 399    fetch_1d_texel_l8,                   /* FetchTexel1D */
 400    fetch_2d_texel_l8,                   /* FetchTexel2D */
 401    fetch_3d_texel_l8,                   /* FetchTexel3D */
 402 };
 403
 404 const struct gl_texture_format _mesa_texformat_i8 = {
 405    MESA_FORMAT_I8,                      /* MesaFormat */
 406    GL_INTENSITY,                        /* IntFormat */
 407    GL_UNSIGNED_BYTE,                    /* Type */
 408    0,                                   /* RedBits */
 409    0,                                   /* GreenBits */
 410    0,                                   /* BlueBits */
 411    0,                                   /* AlphaBits */
 412    0,                                   /* LuminanceBits */
 413    8,                                   /* IntensityBits */
 414    0,                                   /* IndexBits */
 415    0,                                   /* DepthBits */
 416    1,                                   /* TexelBytes */
 417    fetch_1d_texel_i8,                   /* FetchTexel1D */
 418    fetch_2d_texel_i8,                   /* FetchTexel2D */
 419    fetch_3d_texel_i8,                   /* FetchTexel3D */
 420 };
 421
 422 const struct gl_texture_format _mesa_texformat_ci8 = {
 423    MESA_FORMAT_CI8,                     /* MesaFormat */
 424    GL_COLOR_INDEX,                      /* IntFormat */
 425    GL_UNSIGNED_BYTE,                    /* Type */
 426    0,                                   /* RedBits */
 427    0,                                   /* GreenBits */
 428    0,                                   /* BlueBits */
 429    0,                                   /* AlphaBits */
 430    0,                                   /* LuminanceBits */
 431    0,                                   /* IntensityBits */
 432    8,                                   /* IndexBits */
 433    0,                                   /* DepthBits */
 434    1,                                   /* TexelBytes */
 435    fetch_1d_texel_ci8,                  /* FetchTexel1D */
 436    fetch_2d_texel_ci8,                  /* FetchTexel2D */
 437    fetch_3d_texel_ci8,                  /* FetchTexel3D */
 438 };
 439
 440
 441 /* =============================================================
 442  * Null format:
 443  */
 444
 445 const struct gl_texture_format _mesa_null_texformat = {
 446    -1,                                  /* MesaFormat */
 447    0,                                   /* IntFormat */
 448    0,                                   /* Type */
 449    0,                                   /* RedBits */
 450    0,                                   /* GreenBits */
 451    0,                                   /* BlueBits */
 452    0,                                   /* AlphaBits */
 453    0,                                   /* LuminanceBits */
 454    0,                                   /* IntensityBits */
 455    0,                                   /* IndexBits */
 456    0,                                   /* DepthBits */
 457    0,                                   /* TexelBytes */
 458    fetch_null_texel,                    /* FetchTexel1D */
 459    fetch_null_texel,                    /* FetchTexel2D */
 460    fetch_null_texel,                    /* FetchTexel3D */
 461 };
 462
 463
 464
 465 /* Given an internal texture format or 1, 2, 3, 4 initialize the texture
 466  * image structure's default format and type information.  Drivers will
 467  * initialize these fields accordingly if they override the default
 468  * storage format.
 469  */
 470 void _mesa_init_tex_format( GLcontext *ctx, GLenum internalFormat,
 471                             struct gl_texture_image *texImage )
 472 {
 473    const struct gl_texture_format *texFormat;
 474
 475    /* Ask the driver for the base format, if it doesn't know, it will
 476     * return -1;
 477     */
 478    if ( ctx->Driver.BaseCompressedTexFormat ) {
 479       GLint format = 0;                 /* Silence compiler warning */
 480       format = (*ctx->Driver.BaseCompressedTexFormat)( ctx, format );
 481       if ( format >= 0 ) {
 482          internalFormat = format;
 483       }
 484    }
 485
 486    switch ( internalFormat ) {
 487       /* GH: Bias towards GL_RGB, GL_RGBA texture formats.  This has
 488        * got to be better than sticking them way down the end of this
 489        * huge list.
 490        */
 491    case 4:                              /* Quake3 uses this... */
 492    case GL_RGBA:
 493       texFormat = &_mesa_texformat_rgba;
 494       break;
 495
 496    case 3:                              /* ... and this. */
 497    case GL_RGB:
 498       texFormat = &_mesa_texformat_rgb;
 499       break;
 500
 501       /* GH: Okay, keep checking as normal.  Still test for GL_RGB,
 502        * GL_RGBA formats first.
 503        */
 504    case GL_RGBA2:
 505    case GL_RGBA4:
 506    case GL_RGB5_A1:
 507    case GL_RGBA8:
 508    case GL_RGB10_A2:
 509    case GL_RGBA12:
 510    case GL_RGBA16:
 511       texFormat = &_mesa_texformat_rgba;
 512       break;
 513
 514    case GL_R3_G3_B2:
 515    case GL_RGB4:
 516    case GL_RGB5:
 517    case GL_RGB8:
 518    case GL_RGB10:
 519    case GL_RGB12:
 520    case GL_RGB16:
 521       texFormat = &_mesa_texformat_rgb;
 522       break;
 523
 524    case GL_ALPHA:
 525    case GL_ALPHA4:
 526    case GL_ALPHA8:
 527    case GL_ALPHA12:
 528    case GL_ALPHA16:
 529       texFormat = &_mesa_texformat_alpha;
 530       break;
 531
 532    case 1:
 533    case GL_LUMINANCE:
 534    case GL_LUMINANCE4:
 535    case GL_LUMINANCE8:
 536    case GL_LUMINANCE12:
 537    case GL_LUMINANCE16:
 538       texFormat = &_mesa_texformat_luminance;
 539       break;
 540
 541    case 2:
 542    case GL_LUMINANCE_ALPHA:
 543    case GL_LUMINANCE4_ALPHA4:
 544    case GL_LUMINANCE6_ALPHA2:
 545    case GL_LUMINANCE8_ALPHA8:
 546    case GL_LUMINANCE12_ALPHA4:
 547    case GL_LUMINANCE12_ALPHA12:
 548    case GL_LUMINANCE16_ALPHA16:
 549       texFormat = &_mesa_texformat_luminance_alpha;
 550       break;
 551
 552    case GL_INTENSITY:
 553    case GL_INTENSITY4:
 554    case GL_INTENSITY8:
 555    case GL_INTENSITY12:
 556    case GL_INTENSITY16:
 557       texFormat = &_mesa_texformat_intensity;
 558       break;
 559
 560    case GL_COLOR_INDEX:
 561    case GL_COLOR_INDEX1_EXT:
 562    case GL_COLOR_INDEX2_EXT:
 563    case GL_COLOR_INDEX4_EXT:
 564    case GL_COLOR_INDEX8_EXT:
 565    case GL_COLOR_INDEX12_EXT:
 566    case GL_COLOR_INDEX16_EXT:
 567       texFormat = &_mesa_texformat_color_index;
 568       break;
 569
 570    case GL_DEPTH_COMPONENT:
 571    case GL_DEPTH_COMPONENT16_SGIX:
 572    case GL_DEPTH_COMPONENT24_SGIX:
 573    case GL_DEPTH_COMPONENT32_SGIX:
 574       if ( !ctx->Extensions.SGIX_depth_texture )
 575          _mesa_problem( ctx, "depth format without GL_SGIX_depth_texture" );
 576       texFormat = &_mesa_texformat_depth_component;
 577       break;
 578
 579    default:
 580       _mesa_problem( ctx, "unexpected format in _mesa_init_tex_format" );
 581       return;
 582    }
 583
 584    texImage->TexFormat = texFormat;
 585 }