src/mesa/main/glformats.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (c) 2008-2009  VMware, Inc.
   6  * Copyright (c) 2012 Intel Corporation
   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  * THE AUTHORS 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 #include "context.h"
  28 #include "glformats.h"
  29
  30
  31 /**
  32  * Test if the given format is an integer (non-normalized) format.
  33  */
  34 GLboolean
  35 _mesa_is_enum_format_integer(GLenum format)
  36 {
  37    switch (format) {
  38    /* generic integer formats */
  39    case GL_RED_INTEGER_EXT:
  40    case GL_GREEN_INTEGER_EXT:
  41    case GL_BLUE_INTEGER_EXT:
  42    case GL_ALPHA_INTEGER_EXT:
  43    case GL_RGB_INTEGER_EXT:
  44    case GL_RGBA_INTEGER_EXT:
  45    case GL_BGR_INTEGER_EXT:
  46    case GL_BGRA_INTEGER_EXT:
  47    case GL_LUMINANCE_INTEGER_EXT:
  48    case GL_LUMINANCE_ALPHA_INTEGER_EXT:
  49    case GL_RG_INTEGER:
  50    /* specific integer formats */
  51    case GL_RGBA32UI_EXT:
  52    case GL_RGB32UI_EXT:
  53    case GL_RG32UI:
  54    case GL_R32UI:
  55    case GL_ALPHA32UI_EXT:
  56    case GL_INTENSITY32UI_EXT:
  57    case GL_LUMINANCE32UI_EXT:
  58    case GL_LUMINANCE_ALPHA32UI_EXT:
  59    case GL_RGBA16UI_EXT:
  60    case GL_RGB16UI_EXT:
  61    case GL_RG16UI:
  62    case GL_R16UI:
  63    case GL_ALPHA16UI_EXT:
  64    case GL_INTENSITY16UI_EXT:
  65    case GL_LUMINANCE16UI_EXT:
  66    case GL_LUMINANCE_ALPHA16UI_EXT:
  67    case GL_RGBA8UI_EXT:
  68    case GL_RGB8UI_EXT:
  69    case GL_RG8UI:
  70    case GL_R8UI:
  71    case GL_ALPHA8UI_EXT:
  72    case GL_INTENSITY8UI_EXT:
  73    case GL_LUMINANCE8UI_EXT:
  74    case GL_LUMINANCE_ALPHA8UI_EXT:
  75    case GL_RGBA32I_EXT:
  76    case GL_RGB32I_EXT:
  77    case GL_RG32I:
  78    case GL_R32I:
  79    case GL_ALPHA32I_EXT:
  80    case GL_INTENSITY32I_EXT:
  81    case GL_LUMINANCE32I_EXT:
  82    case GL_LUMINANCE_ALPHA32I_EXT:
  83    case GL_RGBA16I_EXT:
  84    case GL_RGB16I_EXT:
  85    case GL_RG16I:
  86    case GL_R16I:
  87    case GL_ALPHA16I_EXT:
  88    case GL_INTENSITY16I_EXT:
  89    case GL_LUMINANCE16I_EXT:
  90    case GL_LUMINANCE_ALPHA16I_EXT:
  91    case GL_RGBA8I_EXT:
  92    case GL_RGB8I_EXT:
  93    case GL_RG8I:
  94    case GL_R8I:
  95    case GL_ALPHA8I_EXT:
  96    case GL_INTENSITY8I_EXT:
  97    case GL_LUMINANCE8I_EXT:
  98    case GL_LUMINANCE_ALPHA8I_EXT:
  99    case GL_RGB10_A2UI:
 100       return GL_TRUE;
 101    default:
 102       return GL_FALSE;
 103    }
 104 }
 105
 106
 107 /**
 108  * Test if the given type is an integer (non-normalized) format.
 109  */
 110 GLboolean
 111 _mesa_is_type_integer(GLenum type)
 112 {
 113    switch (type) {
 114    case GL_INT:
 115    case GL_UNSIGNED_INT:
 116    case GL_SHORT:
 117    case GL_UNSIGNED_SHORT:
 118    case GL_BYTE:
 119    case GL_UNSIGNED_BYTE:
 120       return GL_TRUE;
 121    default:
 122       return GL_FALSE;
 123    }
 124 }
 125
 126
 127 /**
 128  * Test if the given format or type is an integer (non-normalized) format.
 129  */
 130 extern GLboolean
 131 _mesa_is_enum_format_or_type_integer(GLenum format, GLenum type)
 132 {
 133    return _mesa_is_enum_format_integer(format) || _mesa_is_type_integer(type);
 134 }
 135
 136
 137 GLboolean
 138 _mesa_is_type_unsigned(GLenum type)
 139 {
 140    switch (type) {
 141    case GL_UNSIGNED_INT:
 142    case GL_UNSIGNED_INT_8_8_8_8:
 143    case GL_UNSIGNED_INT_8_8_8_8_REV:
 144    case GL_UNSIGNED_INT_10_10_10_2:
 145    case GL_UNSIGNED_INT_2_10_10_10_REV:
 146
 147    case GL_UNSIGNED_SHORT:
 148    case GL_UNSIGNED_SHORT_4_4_4_4:
 149    case GL_UNSIGNED_SHORT_5_5_5_1:
 150    case GL_UNSIGNED_SHORT_5_6_5:
 151    case GL_UNSIGNED_SHORT_5_6_5_REV:
 152    case GL_UNSIGNED_SHORT_4_4_4_4_REV:
 153    case GL_UNSIGNED_SHORT_1_5_5_5_REV:
 154    case GL_UNSIGNED_SHORT_8_8_MESA:
 155    case GL_UNSIGNED_SHORT_8_8_REV_MESA:
 156
 157    case GL_UNSIGNED_BYTE:
 158    case GL_UNSIGNED_BYTE_3_3_2:
 159    case GL_UNSIGNED_BYTE_2_3_3_REV:
 160       return GL_TRUE;
 161
 162    default:
 163       return GL_FALSE;
 164    }
 165 }
 166
 167
 168 /**
 169  * Test if the given image format is a color/RGBA format (i.e., not color
 170  * index, depth, stencil, etc).
 171  * \param format  the image format value (may by an internal texture format)
 172  * \return GL_TRUE if its a color/RGBA format, GL_FALSE otherwise.
 173  */
 174 GLboolean
 175 _mesa_is_color_format(GLenum format)
 176 {
 177    switch (format) {
 178       case GL_RED:
 179       case GL_GREEN:
 180       case GL_BLUE:
 181       case GL_ALPHA:
 182       case GL_ALPHA4:
 183       case GL_ALPHA8:
 184       case GL_ALPHA12:
 185       case GL_ALPHA16:
 186       case 1:
 187       case GL_LUMINANCE:
 188       case GL_LUMINANCE4:
 189       case GL_LUMINANCE8:
 190       case GL_LUMINANCE12:
 191       case GL_LUMINANCE16:
 192       case 2:
 193       case GL_LUMINANCE_ALPHA:
 194       case GL_LUMINANCE4_ALPHA4:
 195       case GL_LUMINANCE6_ALPHA2:
 196       case GL_LUMINANCE8_ALPHA8:
 197       case GL_LUMINANCE12_ALPHA4:
 198       case GL_LUMINANCE12_ALPHA12:
 199       case GL_LUMINANCE16_ALPHA16:
 200       case GL_INTENSITY:
 201       case GL_INTENSITY4:
 202       case GL_INTENSITY8:
 203       case GL_INTENSITY12:
 204       case GL_INTENSITY16:
 205       case GL_R8:
 206       case GL_R16:
 207       case GL_RG:
 208       case GL_RG8:
 209       case GL_RG16:
 210       case 3:
 211       case GL_RGB:
 212       case GL_BGR:
 213       case GL_R3_G3_B2:
 214       case GL_RGB4:
 215       case GL_RGB5:
 216       case GL_RGB565:
 217       case GL_RGB8:
 218       case GL_RGB10:
 219       case GL_RGB12:
 220       case GL_RGB16:
 221       case 4:
 222       case GL_ABGR_EXT:
 223       case GL_RGBA:
 224       case GL_BGRA:
 225       case GL_RGBA2:
 226       case GL_RGBA4:
 227       case GL_RGB5_A1:
 228       case GL_RGBA8:
 229       case GL_RGB10_A2:
 230       case GL_RGBA12:
 231       case GL_RGBA16:
 232       /* float texture formats */
 233       case GL_ALPHA16F_ARB:
 234       case GL_ALPHA32F_ARB:
 235       case GL_LUMINANCE16F_ARB:
 236       case GL_LUMINANCE32F_ARB:
 237       case GL_LUMINANCE_ALPHA16F_ARB:
 238       case GL_LUMINANCE_ALPHA32F_ARB:
 239       case GL_INTENSITY16F_ARB:
 240       case GL_INTENSITY32F_ARB:
 241       case GL_R16F:
 242       case GL_R32F:
 243       case GL_RG16F:
 244       case GL_RG32F:
 245       case GL_RGB16F_ARB:
 246       case GL_RGB32F_ARB:
 247       case GL_RGBA16F_ARB:
 248       case GL_RGBA32F_ARB:
 249       /* compressed formats */
 250       case GL_COMPRESSED_ALPHA:
 251       case GL_COMPRESSED_LUMINANCE:
 252       case GL_COMPRESSED_LUMINANCE_ALPHA:
 253       case GL_COMPRESSED_INTENSITY:
 254       case GL_COMPRESSED_RED:
 255       case GL_COMPRESSED_RG:
 256       case GL_COMPRESSED_RGB:
 257       case GL_COMPRESSED_RGBA:
 258       case GL_RGB_S3TC:
 259       case GL_RGB4_S3TC:
 260       case GL_RGBA_S3TC:
 261       case GL_RGBA4_S3TC:
 262       case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 263       case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 264       case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 265       case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 266       case GL_COMPRESSED_RGB_FXT1_3DFX:
 267       case GL_COMPRESSED_RGBA_FXT1_3DFX:
 268 #if FEATURE_EXT_texture_sRGB
 269       case GL_SRGB_EXT:
 270       case GL_SRGB8_EXT:
 271       case GL_SRGB_ALPHA_EXT:
 272       case GL_SRGB8_ALPHA8_EXT:
 273       case GL_SLUMINANCE_ALPHA_EXT:
 274       case GL_SLUMINANCE8_ALPHA8_EXT:
 275       case GL_SLUMINANCE_EXT:
 276       case GL_SLUMINANCE8_EXT:
 277       case GL_COMPRESSED_SRGB_EXT:
 278       case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 279       case GL_COMPRESSED_SRGB_ALPHA_EXT:
 280       case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 281       case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 282       case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 283       case GL_COMPRESSED_SLUMINANCE_EXT:
 284       case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 285 #endif /* FEATURE_EXT_texture_sRGB */
 286       case GL_COMPRESSED_RED_RGTC1:
 287       case GL_COMPRESSED_SIGNED_RED_RGTC1:
 288       case GL_COMPRESSED_RG_RGTC2:
 289       case GL_COMPRESSED_SIGNED_RG_RGTC2:
 290       case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
 291       case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
 292       case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
 293       case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
 294       case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
 295       case GL_ETC1_RGB8_OES:
 296       /* generic integer formats */
 297       case GL_RED_INTEGER_EXT:
 298       case GL_GREEN_INTEGER_EXT:
 299       case GL_BLUE_INTEGER_EXT:
 300       case GL_ALPHA_INTEGER_EXT:
 301       case GL_RGB_INTEGER_EXT:
 302       case GL_RGBA_INTEGER_EXT:
 303       case GL_BGR_INTEGER_EXT:
 304       case GL_BGRA_INTEGER_EXT:
 305       case GL_RG_INTEGER:
 306       case GL_LUMINANCE_INTEGER_EXT:
 307       case GL_LUMINANCE_ALPHA_INTEGER_EXT:
 308       /* sized integer formats */
 309       case GL_RGBA32UI_EXT:
 310       case GL_RGB32UI_EXT:
 311       case GL_RG32UI:
 312       case GL_R32UI:
 313       case GL_ALPHA32UI_EXT:
 314       case GL_INTENSITY32UI_EXT:
 315       case GL_LUMINANCE32UI_EXT:
 316       case GL_LUMINANCE_ALPHA32UI_EXT:
 317       case GL_RGBA16UI_EXT:
 318       case GL_RGB16UI_EXT:
 319       case GL_RG16UI:
 320       case GL_R16UI:
 321       case GL_ALPHA16UI_EXT:
 322       case GL_INTENSITY16UI_EXT:
 323       case GL_LUMINANCE16UI_EXT:
 324       case GL_LUMINANCE_ALPHA16UI_EXT:
 325       case GL_RGBA8UI_EXT:
 326       case GL_RGB8UI_EXT:
 327       case GL_RG8UI:
 328       case GL_R8UI:
 329       case GL_ALPHA8UI_EXT:
 330       case GL_INTENSITY8UI_EXT:
 331       case GL_LUMINANCE8UI_EXT:
 332       case GL_LUMINANCE_ALPHA8UI_EXT:
 333       case GL_RGBA32I_EXT:
 334       case GL_RGB32I_EXT:
 335       case GL_RG32I:
 336       case GL_R32I:
 337       case GL_ALPHA32I_EXT:
 338       case GL_INTENSITY32I_EXT:
 339       case GL_LUMINANCE32I_EXT:
 340       case GL_LUMINANCE_ALPHA32I_EXT:
 341       case GL_RGBA16I_EXT:
 342       case GL_RGB16I_EXT:
 343       case GL_RG16I:
 344       case GL_R16I:
 345       case GL_ALPHA16I_EXT:
 346       case GL_INTENSITY16I_EXT:
 347       case GL_LUMINANCE16I_EXT:
 348       case GL_LUMINANCE_ALPHA16I_EXT:
 349       case GL_RGBA8I_EXT:
 350       case GL_RGB8I_EXT:
 351       case GL_RG8I:
 352       case GL_R8I:
 353       case GL_ALPHA8I_EXT:
 354       case GL_INTENSITY8I_EXT:
 355       case GL_LUMINANCE8I_EXT:
 356       case GL_LUMINANCE_ALPHA8I_EXT:
 357       /* signed, normalized texture formats */
 358       case GL_RED_SNORM:
 359       case GL_R8_SNORM:
 360       case GL_R16_SNORM:
 361       case GL_RG_SNORM:
 362       case GL_RG8_SNORM:
 363       case GL_RG16_SNORM:
 364       case GL_RGB_SNORM:
 365       case GL_RGB8_SNORM:
 366       case GL_RGB16_SNORM:
 367       case GL_RGBA_SNORM:
 368       case GL_RGBA8_SNORM:
 369       case GL_RGBA16_SNORM:
 370       case GL_ALPHA_SNORM:
 371       case GL_ALPHA8_SNORM:
 372       case GL_ALPHA16_SNORM:
 373       case GL_LUMINANCE_SNORM:
 374       case GL_LUMINANCE8_SNORM:
 375       case GL_LUMINANCE16_SNORM:
 376       case GL_LUMINANCE_ALPHA_SNORM:
 377       case GL_LUMINANCE8_ALPHA8_SNORM:
 378       case GL_LUMINANCE16_ALPHA16_SNORM:
 379       case GL_INTENSITY_SNORM:
 380       case GL_INTENSITY8_SNORM:
 381       case GL_INTENSITY16_SNORM:
 382       case GL_RGB9_E5:
 383       case GL_R11F_G11F_B10F:
 384       case GL_RGB10_A2UI:
 385          return GL_TRUE;
 386       case GL_YCBCR_MESA:  /* not considered to be RGB */
 387          /* fall-through */
 388       default:
 389          return GL_FALSE;
 390    }
 391 }
 392
 393
 394 /**
 395  * Test if the given image format is a depth component format.
 396  */
 397 GLboolean
 398 _mesa_is_depth_format(GLenum format)
 399 {
 400    switch (format) {
 401       case GL_DEPTH_COMPONENT:
 402       case GL_DEPTH_COMPONENT16:
 403       case GL_DEPTH_COMPONENT24:
 404       case GL_DEPTH_COMPONENT32:
 405       case GL_DEPTH_COMPONENT32F:
 406          return GL_TRUE;
 407       default:
 408          return GL_FALSE;
 409    }
 410 }
 411
 412
 413 /**
 414  * Test if the given image format is a stencil format.
 415  */
 416 GLboolean
 417 _mesa_is_stencil_format(GLenum format)
 418 {
 419    switch (format) {
 420       case GL_STENCIL_INDEX:
 421          return GL_TRUE;
 422       default:
 423          return GL_FALSE;
 424    }
 425 }
 426
 427
 428 /**
 429  * Test if the given image format is a YCbCr format.
 430  */
 431 GLboolean
 432 _mesa_is_ycbcr_format(GLenum format)
 433 {
 434    switch (format) {
 435       case GL_YCBCR_MESA:
 436          return GL_TRUE;
 437       default:
 438          return GL_FALSE;
 439    }
 440 }
 441
 442
 443 /**
 444  * Test if the given image format is a depth+stencil format.
 445  */
 446 GLboolean
 447 _mesa_is_depthstencil_format(GLenum format)
 448 {
 449    switch (format) {
 450       case GL_DEPTH24_STENCIL8_EXT:
 451       case GL_DEPTH_STENCIL_EXT:
 452       case GL_DEPTH32F_STENCIL8:
 453          return GL_TRUE;
 454       default:
 455          return GL_FALSE;
 456    }
 457 }
 458
 459
 460 /**
 461  * Test if the given image format is a depth or stencil format.
 462  */
 463 GLboolean
 464 _mesa_is_depth_or_stencil_format(GLenum format)
 465 {
 466    switch (format) {
 467       case GL_DEPTH_COMPONENT:
 468       case GL_DEPTH_COMPONENT16:
 469       case GL_DEPTH_COMPONENT24:
 470       case GL_DEPTH_COMPONENT32:
 471       case GL_STENCIL_INDEX:
 472       case GL_STENCIL_INDEX1_EXT:
 473       case GL_STENCIL_INDEX4_EXT:
 474       case GL_STENCIL_INDEX8_EXT:
 475       case GL_STENCIL_INDEX16_EXT:
 476       case GL_DEPTH_STENCIL_EXT:
 477       case GL_DEPTH24_STENCIL8_EXT:
 478       case GL_DEPTH_COMPONENT32F:
 479       case GL_DEPTH32F_STENCIL8:
 480          return GL_TRUE;
 481       default:
 482          return GL_FALSE;
 483    }
 484 }
 485
 486
 487 /**
 488  * Test if the given image format is a dudv format.
 489  */
 490 GLboolean
 491 _mesa_is_dudv_format(GLenum format)
 492 {
 493    switch (format) {
 494       case GL_DUDV_ATI:
 495       case GL_DU8DV8_ATI:
 496          return GL_TRUE;
 497       default:
 498          return GL_FALSE;
 499    }
 500 }
 501
 502
 503 /**
 504  * Test if an image format is a supported compressed format.
 505  * \param format the internal format token provided by the user.
 506  * \return GL_TRUE if compressed, GL_FALSE if uncompressed
 507  */
 508 GLboolean
 509 _mesa_is_compressed_format(struct gl_context *ctx, GLenum format)
 510 {
 511    switch (format) {
 512    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 513    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 514    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 515    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 516       return ctx->Extensions.EXT_texture_compression_s3tc;
 517    case GL_RGB_S3TC:
 518    case GL_RGB4_S3TC:
 519    case GL_RGBA_S3TC:
 520    case GL_RGBA4_S3TC:
 521       return ctx->Extensions.S3_s3tc;
 522    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 523    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 524    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 525    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 526       return ctx->Extensions.EXT_texture_sRGB
 527          && ctx->Extensions.EXT_texture_compression_s3tc;
 528    case GL_COMPRESSED_RGB_FXT1_3DFX:
 529    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 530       return ctx->Extensions.TDFX_texture_compression_FXT1;
 531    case GL_COMPRESSED_RED_RGTC1:
 532    case GL_COMPRESSED_SIGNED_RED_RGTC1:
 533    case GL_COMPRESSED_RG_RGTC2:
 534    case GL_COMPRESSED_SIGNED_RG_RGTC2:
 535       return ctx->Extensions.ARB_texture_compression_rgtc;
 536    case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
 537    case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
 538    case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
 539    case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
 540       return ctx->Extensions.EXT_texture_compression_latc;
 541    case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
 542       return ctx->Extensions.ATI_texture_compression_3dc;
 543    case GL_ETC1_RGB8_OES:
 544       return ctx->Extensions.OES_compressed_ETC1_RGB8_texture;
 545 #if FEATURE_ES
 546    case GL_PALETTE4_RGB8_OES:
 547    case GL_PALETTE4_RGBA8_OES:
 548    case GL_PALETTE4_R5_G6_B5_OES:
 549    case GL_PALETTE4_RGBA4_OES:
 550    case GL_PALETTE4_RGB5_A1_OES:
 551    case GL_PALETTE8_RGB8_OES:
 552    case GL_PALETTE8_RGBA8_OES:
 553    case GL_PALETTE8_R5_G6_B5_OES:
 554    case GL_PALETTE8_RGBA4_OES:
 555    case GL_PALETTE8_RGB5_A1_OES:
 556       return ctx->API == API_OPENGLES;
 557 #endif
 558    default:
 559       return GL_FALSE;
 560    }
 561 }
 562
 563
 564 /**
 565  * Convert various base formats to the cooresponding integer format.
 566  */
 567 GLenum
 568 _mesa_base_format_to_integer_format(GLenum format)
 569 {
 570    switch(format) {
 571    case GL_RED:
 572       return GL_RED_INTEGER;
 573    case GL_GREEN:
 574       return GL_GREEN_INTEGER;
 575    case GL_BLUE:
 576       return GL_BLUE_INTEGER;
 577    case GL_RG:
 578       return GL_RG_INTEGER;
 579    case GL_RGB:
 580       return GL_RGB_INTEGER;
 581    case GL_RGBA:
 582       return GL_RGBA_INTEGER;
 583    case GL_BGR:
 584       return GL_BGR_INTEGER;
 585    case GL_BGRA:
 586       return GL_BGRA_INTEGER;
 587    case GL_ALPHA:
 588       return GL_ALPHA_INTEGER;
 589    case GL_LUMINANCE:
 590       return GL_LUMINANCE_INTEGER_EXT;
 591    case GL_LUMINANCE_ALPHA:
 592       return GL_LUMINANCE_ALPHA_INTEGER_EXT;
 593    }
 594
 595    return format;
 596 }
 597