src/mesa/state_tracker/st_format.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * 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
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 /**
  30  * Texture Image-related functions.
  31  * \author Brian Paul
  32  */
  33
  34 #include "main/imports.h"
  35 #include "main/context.h"
  36 #include "main/texstore.h"
  37 #include "main/texformat.h"
  38 #include "main/enums.h"
  39 #include "main/macros.h"
  40
  41 #include "pipe/p_context.h"
  42 #include "pipe/p_defines.h"
  43 #include "st_context.h"
  44 #include "st_format.h"
  45
  46 static GLuint
  47 format_bits(
  48    pipe_format_rgbazs_t  info,
  49    GLuint comp )
  50 {
  51    GLuint   size;
  52
  53    if (pf_swizzle_x(info) == comp) {
  54       size = pf_size_x(info);
  55    }
  56    else if (pf_swizzle_y(info) == comp) {
  57       size = pf_size_y(info);
  58    }
  59    else if (pf_swizzle_z(info) == comp) {
  60       size = pf_size_z(info);
  61    }
  62    else if (pf_swizzle_w(info) == comp) {
  63       size = pf_size_w(info);
  64    }
  65    else {
  66       size = 0;
  67    }
  68    return size << (pf_exp8(info) * 3);
  69 }
  70
  71 static GLuint
  72 format_max_bits(
  73    pipe_format_rgbazs_t  info )
  74 {
  75    GLuint   size = format_bits( info, PIPE_FORMAT_COMP_R );
  76
  77    size = MAX2( size, format_bits( info, PIPE_FORMAT_COMP_G ) );
  78    size = MAX2( size, format_bits( info, PIPE_FORMAT_COMP_B ) );
  79    size = MAX2( size, format_bits( info, PIPE_FORMAT_COMP_A ) );
  80    size = MAX2( size, format_bits( info, PIPE_FORMAT_COMP_Z ) );
  81    size = MAX2( size, format_bits( info, PIPE_FORMAT_COMP_S ) );
  82    return size;
  83 }
  84
  85 static GLuint
  86 format_size(
  87    pipe_format_rgbazs_t  info )
  88 {
  89    return
  90       format_bits( info, PIPE_FORMAT_COMP_R ) +
  91       format_bits( info, PIPE_FORMAT_COMP_G ) +
  92       format_bits( info, PIPE_FORMAT_COMP_B ) +
  93       format_bits( info, PIPE_FORMAT_COMP_A ) +
  94       format_bits( info, PIPE_FORMAT_COMP_Z ) +
  95       format_bits( info, PIPE_FORMAT_COMP_S );
  96 }
  97
  98 /*
  99  * XXX temporary here
 100  */
 101 GLboolean
 102 st_get_format_info(enum pipe_format format, struct pipe_format_info *pinfo)
 103 {
 104    if (pf_layout(format) == PIPE_FORMAT_LAYOUT_RGBAZS) {
 105       pipe_format_rgbazs_t info;
 106
 107       info = format;
 108
 109 #if 0
 110       {
 111          char  fmtname[256];
 112
 113          pf_sprint_name( fmtname, format );
 114          printf(
 115             "%s\n",
 116             fmtname );
 117       }
 118 #endif
 119
 120       /* Data type */
 121       if (format == PIPE_FORMAT_A1R5G5B5_UNORM || format == PIPE_FORMAT_R5G6B5_UNORM) {
 122          pinfo->datatype = GL_UNSIGNED_SHORT;
 123       }
 124       else {
 125          GLuint size;
 126
 127          size = format_max_bits( info );
 128          if (size == 8) {
 129             if (pf_type(info) == PIPE_FORMAT_TYPE_UNORM)
 130                pinfo->datatype = GL_UNSIGNED_BYTE;
 131             else
 132                pinfo->datatype = GL_BYTE;
 133          }
 134          else if (size == 16) {
 135             if (pf_type(info) == PIPE_FORMAT_TYPE_UNORM)
 136                pinfo->datatype = GL_UNSIGNED_SHORT;
 137             else
 138                pinfo->datatype = GL_SHORT;
 139          }
 140          else {
 141             assert( size <= 32 );
 142             if (pf_type(info) == PIPE_FORMAT_TYPE_UNORM)
 143                pinfo->datatype = GL_UNSIGNED_INT;
 144             else
 145                pinfo->datatype = GL_INT;
 146          }
 147       }
 148
 149       /* Component bits */
 150       pinfo->red_bits = format_bits( info, PIPE_FORMAT_COMP_R );
 151       pinfo->green_bits = format_bits( info, PIPE_FORMAT_COMP_G );
 152       pinfo->blue_bits = format_bits( info, PIPE_FORMAT_COMP_B );
 153       pinfo->alpha_bits = format_bits( info, PIPE_FORMAT_COMP_A );
 154       pinfo->depth_bits = format_bits( info, PIPE_FORMAT_COMP_Z );
 155       pinfo->stencil_bits = format_bits( info, PIPE_FORMAT_COMP_S );
 156       pinfo->luminance_bits = 0;
 157       pinfo->intensity_bits = 0;
 158
 159       /* Format size */
 160       pinfo->size = format_size( info ) / 8;
 161
 162       /* Luminance & Intensity bits */
 163       if( pf_swizzle_x(info) == PIPE_FORMAT_COMP_R &&
 164           pf_swizzle_y(info) == PIPE_FORMAT_COMP_R &&
 165           pf_swizzle_z(info) == PIPE_FORMAT_COMP_R ) {
 166          if( pf_swizzle_w(info) == PIPE_FORMAT_COMP_R ) {
 167             pinfo->intensity_bits = pinfo->red_bits;
 168          }
 169          else {
 170             pinfo->luminance_bits = pinfo->red_bits;
 171          }
 172          pinfo->red_bits = 0;
 173       }
 174
 175       /* Base format */
 176       if (pinfo->depth_bits) {
 177          if (pinfo->stencil_bits) {
 178             pinfo->base_format = GL_DEPTH_STENCIL_EXT;
 179          }
 180          else {
 181             pinfo->base_format = GL_DEPTH_COMPONENT;
 182          }
 183       }
 184       else if (pinfo->stencil_bits) {
 185          pinfo->base_format = GL_STENCIL_INDEX;
 186       }
 187       else {
 188          pinfo->base_format = GL_RGBA;
 189       }
 190    }
 191    else {
 192       pipe_format_ycbcr_t info;
 193
 194       assert( pf_layout(format) == PIPE_FORMAT_LAYOUT_YCBCR );
 195
 196       info = format;
 197
 198       /* TODO */
 199       assert( 0 );
 200    }
 201
 202 #if 0
 203    printf(
 204       "ST_FORMAT: R(%u), G(%u), B(%u), A(%u), Z(%u), S(%u)\n",
 205       pinfo->red_bits,
 206       pinfo->green_bits,
 207       pinfo->blue_bits,
 208       pinfo->alpha_bits,
 209       pinfo->depth_bits,
 210       pinfo->stencil_bits );
 211 #endif
 212
 213    pinfo->format = format;
 214
 215    return GL_TRUE;
 216 }
 217
 218
 219 /**
 220  * Return bytes per pixel for the given format.
 221  */
 222 GLuint
 223 st_sizeof_format(enum pipe_format format)
 224 {
 225    struct pipe_format_info info;
 226    if (!st_get_format_info( format, &info )) {
 227       assert( 0 );
 228       return 0;
 229    }
 230    return info.size;
 231 }
 232
 233
 234 /**
 235  * Return bytes per pixel for the given format.
 236  */
 237 GLenum
 238 st_format_datatype(enum pipe_format format)
 239 {
 240    struct pipe_format_info info;
 241    if (!st_get_format_info( format, &info )) {
 242       assert( 0 );
 243       return 0;
 244    }
 245    return info.datatype;
 246 }
 247
 248
 249 enum pipe_format
 250 st_mesa_format_to_pipe_format(GLuint mesaFormat)
 251 {
 252    switch (mesaFormat) {
 253       /* fix this */
 254    case MESA_FORMAT_ARGB8888_REV:
 255    case MESA_FORMAT_ARGB8888:
 256       return PIPE_FORMAT_A8R8G8B8_UNORM;
 257    case MESA_FORMAT_ARGB4444:
 258       return PIPE_FORMAT_A4R4G4B4_UNORM;
 259    case MESA_FORMAT_AL88:
 260       return PIPE_FORMAT_U_A8_L8;
 261    case MESA_FORMAT_A8:
 262       return PIPE_FORMAT_U_A8;
 263    case MESA_FORMAT_L8:
 264       return PIPE_FORMAT_U_L8;
 265    case MESA_FORMAT_I8:
 266       return PIPE_FORMAT_U_I8;
 267    case MESA_FORMAT_Z16:
 268       return PIPE_FORMAT_Z16_UNORM;
 269    default:
 270       assert(0);
 271       return 0;
 272    }
 273 }
 274
 275 /**
 276  * Find an RGBA format supported by the context/winsys.
 277  */
 278 static GLuint
 279 default_rgba_format(struct pipe_context *pipe, uint type)
 280 {
 281    static const enum pipe_format colorFormats[] = {
 282       PIPE_FORMAT_R8G8B8A8_UNORM,
 283       PIPE_FORMAT_A8R8G8B8_UNORM,
 284       PIPE_FORMAT_B8G8R8A8_UNORM,
 285       PIPE_FORMAT_R5G6B5_UNORM
 286    };
 287    uint i;
 288    for (i = 0; i < Elements(colorFormats); i++) {
 289       if (pipe->is_format_supported( pipe, colorFormats[i], type )) {
 290          return colorFormats[i];
 291       }
 292    }
 293    return PIPE_FORMAT_NONE;
 294 }
 295
 296
 297 /**
 298  * Search list of formats for first RGBA format with >8 bits/channel.
 299  */
 300 static GLuint
 301 default_deep_rgba_format(struct pipe_context *pipe, uint type)
 302 {
 303    if (pipe->is_format_supported(pipe, PIPE_FORMAT_R16G16B16A16_SNORM, type)) {
 304       return PIPE_FORMAT_R16G16B16A16_SNORM;
 305    }
 306    return PIPE_FORMAT_NONE;
 307 }
 308
 309
 310 /**
 311  * Find an Z format supported by the context/winsys.
 312  */
 313 static GLuint
 314 default_depth_format(struct pipe_context *pipe, uint type)
 315 {
 316    static const enum pipe_format zFormats[] = {
 317       PIPE_FORMAT_Z16_UNORM,
 318       PIPE_FORMAT_Z32_UNORM,
 319       PIPE_FORMAT_S8Z24_UNORM,
 320       PIPE_FORMAT_Z24S8_UNORM
 321    };
 322    uint i;
 323    for (i = 0; i < Elements(zFormats); i++) {
 324       if (pipe->is_format_supported( pipe, zFormats[i], type )) {
 325          return zFormats[i];
 326       }
 327    }
 328    return PIPE_FORMAT_NONE;
 329 }
 330
 331
 332 /**
 333  * Choose the PIPE_FORMAT_ to use for storing a texture image based
 334  * on the user's internalFormat, format and type parameters.
 335  * We query the pipe device for a list of formats which it supports
 336  * and choose from them.
 337  * If we find a device that needs a more intricate selection mechanism,
 338  * this function _could_ get pushed down into the pipe device.
 339  *
 340  * Note: also used for glRenderbufferStorageEXT()
 341  *
 342  * Note: format and type may be GL_NONE (see renderbuffers)
 343  *
 344  * \return PIPE_FORMAT_NONE if error/problem.
 345  */
 346 GLuint
 347 st_choose_pipe_format(struct pipe_context *pipe, GLint internalFormat,
 348                       GLenum format, GLenum type, uint surfType)
 349 {
 350    assert(surfType == PIPE_TEXTURE ||
 351           surfType == PIPE_SURFACE ||
 352           surfType == PIPE_SCREEN_SURFACE);
 353
 354    switch (internalFormat) {
 355    case 4:
 356    case GL_RGBA:
 357    case GL_COMPRESSED_RGBA:
 358       if (format == GL_BGRA) {
 359          if (type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_INT_8_8_8_8_REV) {
 360             if (pipe->is_format_supported( pipe, PIPE_FORMAT_A8R8G8B8_UNORM, surfType ))
 361                return PIPE_FORMAT_A8R8G8B8_UNORM;
 362          }
 363          else if (type == GL_UNSIGNED_SHORT_4_4_4_4_REV) {
 364             if (pipe->is_format_supported( pipe, PIPE_FORMAT_A4R4G4B4_UNORM, surfType ))
 365                return PIPE_FORMAT_A4R4G4B4_UNORM;
 366          }
 367          else if (type == GL_UNSIGNED_SHORT_1_5_5_5_REV) {
 368             if (pipe->is_format_supported( pipe, PIPE_FORMAT_A1R5G5B5_UNORM, surfType ))
 369                return PIPE_FORMAT_A1R5G5B5_UNORM;
 370          }
 371       }
 372       return default_rgba_format( pipe, surfType );
 373
 374    case 3:
 375    case GL_RGB:
 376    case GL_COMPRESSED_RGB:
 377       if (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) {
 378          if (pipe->is_format_supported( pipe, PIPE_FORMAT_R5G6B5_UNORM, surfType ))
 379             return PIPE_FORMAT_R5G6B5_UNORM;
 380       }
 381       return default_rgba_format( pipe, surfType );
 382
 383    case GL_RGBA8:
 384    case GL_RGB10_A2:
 385    case GL_RGBA12:
 386       return default_rgba_format( pipe, surfType );
 387    case GL_RGBA16:
 388       return default_deep_rgba_format( pipe, surfType );
 389
 390    case GL_RGBA4:
 391    case GL_RGBA2:
 392       if (pipe->is_format_supported( pipe, PIPE_FORMAT_A4R4G4B4_UNORM, surfType ))
 393          return PIPE_FORMAT_A4R4G4B4_UNORM;
 394       return default_rgba_format( pipe, surfType );
 395
 396    case GL_RGB5_A1:
 397       if (pipe->is_format_supported( pipe, PIPE_FORMAT_A1R5G5B5_UNORM, surfType ))
 398          return PIPE_FORMAT_A1R5G5B5_UNORM;
 399       return default_rgba_format( pipe, surfType );
 400
 401    case GL_RGB8:
 402    case GL_RGB10:
 403    case GL_RGB12:
 404    case GL_RGB16:
 405       return default_rgba_format( pipe, surfType );
 406
 407    case GL_RGB5:
 408    case GL_RGB4:
 409    case GL_R3_G3_B2:
 410       if (pipe->is_format_supported( pipe, PIPE_FORMAT_A1R5G5B5_UNORM, surfType ))
 411          return PIPE_FORMAT_A1R5G5B5_UNORM;
 412       return default_rgba_format( pipe, surfType );
 413
 414    case GL_ALPHA:
 415    case GL_ALPHA4:
 416    case GL_ALPHA8:
 417    case GL_ALPHA12:
 418    case GL_ALPHA16:
 419    case GL_COMPRESSED_ALPHA:
 420       if (pipe->is_format_supported( pipe, PIPE_FORMAT_U_A8, surfType ))
 421          return PIPE_FORMAT_U_A8;
 422       return default_rgba_format( pipe, surfType );
 423
 424    case 1:
 425    case GL_LUMINANCE:
 426    case GL_LUMINANCE4:
 427    case GL_LUMINANCE8:
 428    case GL_LUMINANCE12:
 429    case GL_LUMINANCE16:
 430    case GL_COMPRESSED_LUMINANCE:
 431       if (pipe->is_format_supported( pipe, PIPE_FORMAT_U_A8, surfType ))
 432          return PIPE_FORMAT_U_A8;
 433       return default_rgba_format( pipe, surfType );
 434
 435    case 2:
 436    case GL_LUMINANCE_ALPHA:
 437    case GL_LUMINANCE4_ALPHA4:
 438    case GL_LUMINANCE6_ALPHA2:
 439    case GL_LUMINANCE8_ALPHA8:
 440    case GL_LUMINANCE12_ALPHA4:
 441    case GL_LUMINANCE12_ALPHA12:
 442    case GL_LUMINANCE16_ALPHA16:
 443    case GL_COMPRESSED_LUMINANCE_ALPHA:
 444       if (pipe->is_format_supported( pipe, PIPE_FORMAT_U_A8_L8, surfType ))
 445          return PIPE_FORMAT_U_A8_L8;
 446       return default_rgba_format( pipe, surfType );
 447
 448    case GL_INTENSITY:
 449    case GL_INTENSITY4:
 450    case GL_INTENSITY8:
 451    case GL_INTENSITY12:
 452    case GL_INTENSITY16:
 453    case GL_COMPRESSED_INTENSITY:
 454       if (pipe->is_format_supported( pipe, PIPE_FORMAT_U_I8, surfType ))
 455          return PIPE_FORMAT_U_I8;
 456       return default_rgba_format( pipe, surfType );
 457
 458    case GL_YCBCR_MESA:
 459       if (type == GL_UNSIGNED_SHORT_8_8_MESA || type == GL_UNSIGNED_BYTE) {
 460          if (pipe->is_format_supported( pipe, PIPE_FORMAT_YCBCR, surfType ))
 461             return PIPE_FORMAT_YCBCR;
 462       }
 463       else {
 464          if (pipe->is_format_supported( pipe, PIPE_FORMAT_YCBCR_REV, surfType ))
 465             return PIPE_FORMAT_YCBCR_REV;
 466       }
 467       return PIPE_FORMAT_NONE;
 468
 469 #if 0
 470    case GL_COMPRESSED_RGB_FXT1_3DFX:
 471       return &_mesa_texformat_rgb_fxt1;
 472    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 473       return &_mesa_texformat_rgba_fxt1;
 474
 475    case GL_RGB_S3TC:
 476    case GL_RGB4_S3TC:
 477    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 478       return &_mesa_texformat_rgb_dxt1;
 479
 480    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 481       return &_mesa_texformat_rgba_dxt1;
 482
 483    case GL_RGBA_S3TC:
 484    case GL_RGBA4_S3TC:
 485    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 486       return &_mesa_texformat_rgba_dxt3;
 487
 488    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 489       return &_mesa_texformat_rgba_dxt5;
 490 #endif
 491
 492    case GL_DEPTH_COMPONENT16:
 493       if (pipe->is_format_supported( pipe, PIPE_FORMAT_Z16_UNORM, surfType ))
 494          return PIPE_FORMAT_Z16_UNORM;
 495       /* fall-through */
 496    case GL_DEPTH_COMPONENT24:
 497       if (pipe->is_format_supported( pipe, PIPE_FORMAT_S8Z24_UNORM, surfType ))
 498          return PIPE_FORMAT_S8Z24_UNORM;
 499       if (pipe->is_format_supported( pipe, PIPE_FORMAT_Z24S8_UNORM, surfType ))
 500          return PIPE_FORMAT_Z24S8_UNORM;
 501       /* fall-through */
 502    case GL_DEPTH_COMPONENT32:
 503       if (pipe->is_format_supported( pipe, PIPE_FORMAT_Z32_UNORM, surfType ))
 504          return PIPE_FORMAT_Z32_UNORM;
 505       /* fall-through */
 506    case GL_DEPTH_COMPONENT:
 507       return default_depth_format( pipe, surfType );
 508
 509    case GL_STENCIL_INDEX:
 510    case GL_STENCIL_INDEX1_EXT:
 511    case GL_STENCIL_INDEX4_EXT:
 512    case GL_STENCIL_INDEX8_EXT:
 513    case GL_STENCIL_INDEX16_EXT:
 514       if (pipe->is_format_supported( pipe, PIPE_FORMAT_U_S8, surfType ))
 515          return PIPE_FORMAT_U_S8;
 516       if (pipe->is_format_supported( pipe, PIPE_FORMAT_S8Z24_UNORM, surfType ))
 517          return PIPE_FORMAT_S8Z24_UNORM;
 518       if (pipe->is_format_supported( pipe, PIPE_FORMAT_Z24S8_UNORM, surfType ))
 519          return PIPE_FORMAT_Z24S8_UNORM;
 520       return PIPE_FORMAT_NONE;
 521
 522    case GL_DEPTH_STENCIL_EXT:
 523    case GL_DEPTH24_STENCIL8_EXT:
 524       if (pipe->is_format_supported( pipe, PIPE_FORMAT_S8Z24_UNORM, surfType ))
 525          return PIPE_FORMAT_S8Z24_UNORM;
 526       if (pipe->is_format_supported( pipe, PIPE_FORMAT_Z24S8_UNORM, surfType ))
 527          return PIPE_FORMAT_Z24S8_UNORM;
 528       return PIPE_FORMAT_NONE;
 529
 530    default:
 531       return PIPE_FORMAT_NONE;
 532    }
 533 }
 534
 535
 536
 537 /* It works out that this function is fine for all the supported
 538  * hardware.  However, there is still a need to map the formats onto
 539  * hardware descriptors.
 540  */
 541 /* Note that the i915 can actually support many more formats than
 542  * these if we take the step of simply swizzling the colors
 543  * immediately after sampling...
 544  */
 545 const struct gl_texture_format *
 546 st_ChooseTextureFormat(GLcontext * ctx, GLint internalFormat,
 547                        GLenum format, GLenum type)
 548 {
 549 #if 0
 550    struct intel_context *intel = intel_context(ctx);
 551    const GLboolean do32bpt = (intel->intelScreen->front.cpp == 4);
 552 #else
 553    const GLboolean do32bpt = 1;
 554 #endif
 555
 556    (void) ctx;
 557
 558    switch (internalFormat) {
 559    case 4:
 560    case GL_RGBA:
 561    case GL_COMPRESSED_RGBA:
 562       if (format == GL_BGRA) {
 563          if (type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_INT_8_8_8_8_REV) {
 564             return &_mesa_texformat_argb8888;
 565          }
 566          else if (type == GL_UNSIGNED_SHORT_4_4_4_4_REV) {
 567             return &_mesa_texformat_argb4444;
 568          }
 569          else if (type == GL_UNSIGNED_SHORT_1_5_5_5_REV) {
 570             return &_mesa_texformat_argb1555;
 571          }
 572       }
 573       return do32bpt ? &_mesa_texformat_argb8888 : &_mesa_texformat_argb4444;
 574
 575    case 3:
 576    case GL_RGB:
 577    case GL_COMPRESSED_RGB:
 578       if (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) {
 579          return &_mesa_texformat_rgb565;
 580       }
 581       return do32bpt ? &_mesa_texformat_argb8888 : &_mesa_texformat_rgb565;
 582
 583    case GL_RGBA8:
 584    case GL_RGB10_A2:
 585    case GL_RGBA12:
 586    case GL_RGBA16:
 587       return do32bpt ? &_mesa_texformat_argb8888 : &_mesa_texformat_argb4444;
 588
 589    case GL_RGBA4:
 590    case GL_RGBA2:
 591       return &_mesa_texformat_argb4444;
 592
 593    case GL_RGB5_A1:
 594       return &_mesa_texformat_argb1555;
 595
 596    case GL_RGB8:
 597    case GL_RGB10:
 598    case GL_RGB12:
 599    case GL_RGB16:
 600       return &_mesa_texformat_argb8888;
 601
 602    case GL_RGB5:
 603    case GL_RGB4:
 604    case GL_R3_G3_B2:
 605       return &_mesa_texformat_rgb565;
 606
 607    case GL_ALPHA:
 608    case GL_ALPHA4:
 609    case GL_ALPHA8:
 610    case GL_ALPHA12:
 611    case GL_ALPHA16:
 612    case GL_COMPRESSED_ALPHA:
 613       return &_mesa_texformat_a8;
 614
 615    case 1:
 616    case GL_LUMINANCE:
 617    case GL_LUMINANCE4:
 618    case GL_LUMINANCE8:
 619    case GL_LUMINANCE12:
 620    case GL_LUMINANCE16:
 621    case GL_COMPRESSED_LUMINANCE:
 622       return &_mesa_texformat_l8;
 623
 624    case 2:
 625    case GL_LUMINANCE_ALPHA:
 626    case GL_LUMINANCE4_ALPHA4:
 627    case GL_LUMINANCE6_ALPHA2:
 628    case GL_LUMINANCE8_ALPHA8:
 629    case GL_LUMINANCE12_ALPHA4:
 630    case GL_LUMINANCE12_ALPHA12:
 631    case GL_LUMINANCE16_ALPHA16:
 632    case GL_COMPRESSED_LUMINANCE_ALPHA:
 633       return &_mesa_texformat_al88;
 634
 635    case GL_INTENSITY:
 636    case GL_INTENSITY4:
 637    case GL_INTENSITY8:
 638    case GL_INTENSITY12:
 639    case GL_INTENSITY16:
 640    case GL_COMPRESSED_INTENSITY:
 641       return &_mesa_texformat_i8;
 642
 643    case GL_YCBCR_MESA:
 644       if (type == GL_UNSIGNED_SHORT_8_8_MESA || type == GL_UNSIGNED_BYTE)
 645          return &_mesa_texformat_ycbcr;
 646       else
 647          return &_mesa_texformat_ycbcr_rev;
 648
 649    case GL_COMPRESSED_RGB_FXT1_3DFX:
 650       return &_mesa_texformat_rgb_fxt1;
 651    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 652       return &_mesa_texformat_rgba_fxt1;
 653
 654    case GL_RGB_S3TC:
 655    case GL_RGB4_S3TC:
 656    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 657       return &_mesa_texformat_rgb_dxt1;
 658
 659    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 660       return &_mesa_texformat_rgba_dxt1;
 661
 662    case GL_RGBA_S3TC:
 663    case GL_RGBA4_S3TC:
 664    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 665       return &_mesa_texformat_rgba_dxt3;
 666
 667    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 668       return &_mesa_texformat_rgba_dxt5;
 669
 670    case GL_DEPTH_COMPONENT:
 671    case GL_DEPTH_COMPONENT16:
 672    case GL_DEPTH_COMPONENT24:
 673    case GL_DEPTH_COMPONENT32:
 674       return &_mesa_texformat_z16;
 675
 676    case GL_DEPTH_STENCIL_EXT:
 677    case GL_DEPTH24_STENCIL8_EXT:
 678       return &_mesa_texformat_z24_s8;
 679
 680    default:
 681       fprintf(stderr, "unexpected texture format %s in %s\n",
 682               _mesa_lookup_enum_by_nr(internalFormat), __FUNCTION__);
 683       return NULL;
 684    }
 685
 686    return NULL;                 /* never get here */
 687 }