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 OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  22  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  23  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24  * OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #include "context.h"
  29 #include "glformats.h"
  30
  31
  32 /**
  33  * \return GL_TRUE if type is packed pixel type, GL_FALSE otherwise.
  34  */
  35 GLboolean
  36 _mesa_type_is_packed(GLenum type)
  37 {
  38    switch (type) {
  39    case GL_UNSIGNED_BYTE_3_3_2:
  40    case GL_UNSIGNED_BYTE_2_3_3_REV:
  41    case MESA_UNSIGNED_BYTE_4_4:
  42    case GL_UNSIGNED_SHORT_5_6_5:
  43    case GL_UNSIGNED_SHORT_5_6_5_REV:
  44    case GL_UNSIGNED_SHORT_4_4_4_4:
  45    case GL_UNSIGNED_SHORT_4_4_4_4_REV:
  46    case GL_UNSIGNED_SHORT_5_5_5_1:
  47    case GL_UNSIGNED_SHORT_1_5_5_5_REV:
  48    case GL_UNSIGNED_INT_8_8_8_8:
  49    case GL_UNSIGNED_INT_8_8_8_8_REV:
  50    case GL_UNSIGNED_INT_10_10_10_2:
  51    case GL_UNSIGNED_INT_2_10_10_10_REV:
  52    case GL_UNSIGNED_SHORT_8_8_MESA:
  53    case GL_UNSIGNED_SHORT_8_8_REV_MESA:
  54    case GL_UNSIGNED_INT_24_8_EXT:
  55    case GL_UNSIGNED_INT_5_9_9_9_REV:
  56    case GL_UNSIGNED_INT_10F_11F_11F_REV:
  57    case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
  58       return GL_TRUE;
  59    }
  60
  61    return GL_FALSE;
  62 }
  63
  64
  65 /**
  66  * Get the size of a GL data type.
  67  *
  68  * \param type GL data type.
  69  *
  70  * \return the size, in bytes, of the given data type, 0 if a GL_BITMAP, or -1
  71  * if an invalid type enum.
  72  */
  73 GLint
  74 _mesa_sizeof_type(GLenum type)
  75 {
  76    switch (type) {
  77    case GL_BITMAP:
  78       return 0;
  79    case GL_UNSIGNED_BYTE:
  80       return sizeof(GLubyte);
  81    case GL_BYTE:
  82       return sizeof(GLbyte);
  83    case GL_UNSIGNED_SHORT:
  84       return sizeof(GLushort);
  85    case GL_SHORT:
  86       return sizeof(GLshort);
  87    case GL_UNSIGNED_INT:
  88       return sizeof(GLuint);
  89    case GL_INT:
  90       return sizeof(GLint);
  91    case GL_FLOAT:
  92       return sizeof(GLfloat);
  93    case GL_DOUBLE:
  94       return sizeof(GLdouble);
  95    case GL_HALF_FLOAT_ARB:
  96       return sizeof(GLhalfARB);
  97    case GL_FIXED:
  98       return sizeof(GLfixed);
  99    default:
 100       return -1;
 101    }
 102 }
 103
 104
 105 /**
 106  * Same as _mesa_sizeof_type() but also accepting the packed pixel
 107  * format data types.
 108  */
 109 GLint
 110 _mesa_sizeof_packed_type(GLenum type)
 111 {
 112    switch (type) {
 113    case GL_BITMAP:
 114       return 0;
 115    case GL_UNSIGNED_BYTE:
 116       return sizeof(GLubyte);
 117    case GL_BYTE:
 118       return sizeof(GLbyte);
 119    case GL_UNSIGNED_SHORT:
 120       return sizeof(GLushort);
 121    case GL_SHORT:
 122       return sizeof(GLshort);
 123    case GL_UNSIGNED_INT:
 124       return sizeof(GLuint);
 125    case GL_INT:
 126       return sizeof(GLint);
 127    case GL_HALF_FLOAT_ARB:
 128       return sizeof(GLhalfARB);
 129    case GL_FLOAT:
 130       return sizeof(GLfloat);
 131    case GL_UNSIGNED_BYTE_3_3_2:
 132    case GL_UNSIGNED_BYTE_2_3_3_REV:
 133    case MESA_UNSIGNED_BYTE_4_4:
 134       return sizeof(GLubyte);
 135    case GL_UNSIGNED_SHORT_5_6_5:
 136    case GL_UNSIGNED_SHORT_5_6_5_REV:
 137    case GL_UNSIGNED_SHORT_4_4_4_4:
 138    case GL_UNSIGNED_SHORT_4_4_4_4_REV:
 139    case GL_UNSIGNED_SHORT_5_5_5_1:
 140    case GL_UNSIGNED_SHORT_1_5_5_5_REV:
 141    case GL_UNSIGNED_SHORT_8_8_MESA:
 142    case GL_UNSIGNED_SHORT_8_8_REV_MESA:
 143       return sizeof(GLushort);
 144    case GL_UNSIGNED_INT_8_8_8_8:
 145    case GL_UNSIGNED_INT_8_8_8_8_REV:
 146    case GL_UNSIGNED_INT_10_10_10_2:
 147    case GL_UNSIGNED_INT_2_10_10_10_REV:
 148    case GL_UNSIGNED_INT_24_8_EXT:
 149    case GL_UNSIGNED_INT_5_9_9_9_REV:
 150    case GL_UNSIGNED_INT_10F_11F_11F_REV:
 151       return sizeof(GLuint);
 152    case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
 153       return 8;
 154    default:
 155       return -1;
 156    }
 157 }
 158
 159
 160 /**
 161  * Get the number of components in a pixel format.
 162  *
 163  * \param format pixel format.
 164  *
 165  * \return the number of components in the given format, or -1 if a bad format.
 166  */
 167 GLint
 168 _mesa_components_in_format(GLenum format)
 169 {
 170    switch (format) {
 171    case GL_COLOR_INDEX:
 172    case GL_STENCIL_INDEX:
 173    case GL_DEPTH_COMPONENT:
 174    case GL_RED:
 175    case GL_RED_INTEGER_EXT:
 176    case GL_GREEN:
 177    case GL_GREEN_INTEGER_EXT:
 178    case GL_BLUE:
 179    case GL_BLUE_INTEGER_EXT:
 180    case GL_ALPHA:
 181    case GL_ALPHA_INTEGER_EXT:
 182    case GL_LUMINANCE:
 183    case GL_LUMINANCE_INTEGER_EXT:
 184    case GL_INTENSITY:
 185       return 1;
 186
 187    case GL_LUMINANCE_ALPHA:
 188    case GL_LUMINANCE_ALPHA_INTEGER_EXT:
 189    case GL_RG:
 190    case GL_YCBCR_MESA:
 191    case GL_DEPTH_STENCIL_EXT:
 192    case GL_DUDV_ATI:
 193    case GL_DU8DV8_ATI:
 194    case GL_RG_INTEGER:
 195       return 2;
 196
 197    case GL_RGB:
 198    case GL_BGR:
 199    case GL_RGB_INTEGER_EXT:
 200    case GL_BGR_INTEGER_EXT:
 201       return 3;
 202
 203    case GL_RGBA:
 204    case GL_BGRA:
 205    case GL_ABGR_EXT:
 206    case GL_RGBA_INTEGER_EXT:
 207    case GL_BGRA_INTEGER_EXT:
 208       return 4;
 209
 210    default:
 211       return -1;
 212    }
 213 }
 214
 215
 216 /**
 217  * Get the bytes per pixel of pixel format type pair.
 218  *
 219  * \param format pixel format.
 220  * \param type pixel type.
 221  *
 222  * \return bytes per pixel, or -1 if a bad format or type was given.
 223  */
 224 GLint
 225 _mesa_bytes_per_pixel(GLenum format, GLenum type)
 226 {
 227    GLint comps = _mesa_components_in_format(format);
 228    if (comps < 0)
 229       return -1;
 230
 231    switch (type) {
 232    case GL_BITMAP:
 233       return 0;  /* special case */
 234    case GL_BYTE:
 235    case GL_UNSIGNED_BYTE:
 236       return comps * sizeof(GLubyte);
 237    case GL_SHORT:
 238    case GL_UNSIGNED_SHORT:
 239       return comps * sizeof(GLshort);
 240    case GL_INT:
 241    case GL_UNSIGNED_INT:
 242       return comps * sizeof(GLint);
 243    case GL_FLOAT:
 244       return comps * sizeof(GLfloat);
 245    case GL_HALF_FLOAT_ARB:
 246       return comps * sizeof(GLhalfARB);
 247    case GL_UNSIGNED_BYTE_3_3_2:
 248    case GL_UNSIGNED_BYTE_2_3_3_REV:
 249       if (format == GL_RGB || format == GL_BGR ||
 250           format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
 251          return sizeof(GLubyte);
 252       else
 253          return -1;  /* error */
 254    case GL_UNSIGNED_SHORT_5_6_5:
 255    case GL_UNSIGNED_SHORT_5_6_5_REV:
 256       if (format == GL_RGB || format == GL_BGR ||
 257           format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
 258          return sizeof(GLushort);
 259       else
 260          return -1;  /* error */
 261    case GL_UNSIGNED_SHORT_4_4_4_4:
 262    case GL_UNSIGNED_SHORT_4_4_4_4_REV:
 263    case GL_UNSIGNED_SHORT_5_5_5_1:
 264    case GL_UNSIGNED_SHORT_1_5_5_5_REV:
 265       if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
 266           format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)
 267          return sizeof(GLushort);
 268       else
 269          return -1;
 270    case GL_UNSIGNED_INT_8_8_8_8:
 271    case GL_UNSIGNED_INT_8_8_8_8_REV:
 272    case GL_UNSIGNED_INT_10_10_10_2:
 273    case GL_UNSIGNED_INT_2_10_10_10_REV:
 274       if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
 275           format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT ||
 276           format == GL_RGB)
 277          return sizeof(GLuint);
 278       else
 279          return -1;
 280    case GL_UNSIGNED_SHORT_8_8_MESA:
 281    case GL_UNSIGNED_SHORT_8_8_REV_MESA:
 282       if (format == GL_YCBCR_MESA)
 283          return sizeof(GLushort);
 284       else
 285          return -1;
 286    case GL_UNSIGNED_INT_24_8_EXT:
 287       if (format == GL_DEPTH_STENCIL_EXT)
 288          return sizeof(GLuint);
 289       else
 290          return -1;
 291    case GL_UNSIGNED_INT_5_9_9_9_REV:
 292       if (format == GL_RGB)
 293          return sizeof(GLuint);
 294       else
 295          return -1;
 296    case GL_UNSIGNED_INT_10F_11F_11F_REV:
 297       if (format == GL_RGB)
 298          return sizeof(GLuint);
 299       else
 300          return -1;
 301    case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
 302       if (format == GL_DEPTH_STENCIL)
 303          return 8;
 304       else
 305          return -1;
 306    default:
 307       return -1;
 308    }
 309 }
 310
 311
 312 /**
 313  * Get the number of bytes for a vertex attrib with the given number of
 314  * components and type.
 315  *
 316  * \param comps number of components.
 317  * \param type data type.
 318  *
 319  * \return bytes per attribute, or -1 if a bad comps/type combination was given.
 320  */
 321 GLint
 322 _mesa_bytes_per_vertex_attrib(GLint comps, GLenum type)
 323 {
 324    switch (type) {
 325    case GL_BYTE:
 326    case GL_UNSIGNED_BYTE:
 327       return comps * sizeof(GLubyte);
 328    case GL_SHORT:
 329    case GL_UNSIGNED_SHORT:
 330       return comps * sizeof(GLshort);
 331    case GL_INT:
 332    case GL_UNSIGNED_INT:
 333       return comps * sizeof(GLint);
 334    case GL_FLOAT:
 335       return comps * sizeof(GLfloat);
 336    case GL_HALF_FLOAT_ARB:
 337       return comps * sizeof(GLhalfARB);
 338    case GL_DOUBLE:
 339       return comps * sizeof(GLdouble);
 340    case GL_FIXED:
 341       return comps * sizeof(GLfixed);
 342    case GL_INT_2_10_10_10_REV:
 343    case GL_UNSIGNED_INT_2_10_10_10_REV:
 344       if (comps == 4)
 345          return sizeof(GLuint);
 346       else
 347          return -1;
 348    case GL_UNSIGNED_INT_10F_11F_11F_REV:
 349       if (comps == 3)
 350          return sizeof(GLuint);
 351       else
 352          return -1;
 353    default:
 354       return -1;
 355    }
 356 }
 357
 358
 359 /**
 360  * Test if the given format is an integer (non-normalized) format.
 361  */
 362 GLboolean
 363 _mesa_is_enum_format_unsigned_int(GLenum format)
 364 {
 365    switch (format) {
 366    /* specific integer formats */
 367    case GL_RGBA32UI_EXT:
 368    case GL_RGB32UI_EXT:
 369    case GL_RG32UI:
 370    case GL_R32UI:
 371    case GL_ALPHA32UI_EXT:
 372    case GL_INTENSITY32UI_EXT:
 373    case GL_LUMINANCE32UI_EXT:
 374    case GL_LUMINANCE_ALPHA32UI_EXT:
 375    case GL_RGBA16UI_EXT:
 376    case GL_RGB16UI_EXT:
 377    case GL_RG16UI:
 378    case GL_R16UI:
 379    case GL_ALPHA16UI_EXT:
 380    case GL_INTENSITY16UI_EXT:
 381    case GL_LUMINANCE16UI_EXT:
 382    case GL_LUMINANCE_ALPHA16UI_EXT:
 383    case GL_RGBA8UI_EXT:
 384    case GL_RGB8UI_EXT:
 385    case GL_RG8UI:
 386    case GL_R8UI:
 387    case GL_ALPHA8UI_EXT:
 388    case GL_INTENSITY8UI_EXT:
 389    case GL_LUMINANCE8UI_EXT:
 390    case GL_LUMINANCE_ALPHA8UI_EXT:
 391    case GL_RGB10_A2UI:
 392       return GL_TRUE;
 393    default:
 394       return GL_FALSE;
 395    }
 396 }
 397
 398
 399 /**
 400  * Test if the given format is an integer (non-normalized) format.
 401  */
 402 GLboolean
 403 _mesa_is_enum_format_signed_int(GLenum format)
 404 {
 405    switch (format) {
 406    /* generic integer formats */
 407    case GL_RED_INTEGER_EXT:
 408    case GL_GREEN_INTEGER_EXT:
 409    case GL_BLUE_INTEGER_EXT:
 410    case GL_ALPHA_INTEGER_EXT:
 411    case GL_RGB_INTEGER_EXT:
 412    case GL_RGBA_INTEGER_EXT:
 413    case GL_BGR_INTEGER_EXT:
 414    case GL_BGRA_INTEGER_EXT:
 415    case GL_LUMINANCE_INTEGER_EXT:
 416    case GL_LUMINANCE_ALPHA_INTEGER_EXT:
 417    case GL_RG_INTEGER:
 418    /* specific integer formats */
 419    case GL_RGBA32I_EXT:
 420    case GL_RGB32I_EXT:
 421    case GL_RG32I:
 422    case GL_R32I:
 423    case GL_ALPHA32I_EXT:
 424    case GL_INTENSITY32I_EXT:
 425    case GL_LUMINANCE32I_EXT:
 426    case GL_LUMINANCE_ALPHA32I_EXT:
 427    case GL_RGBA16I_EXT:
 428    case GL_RGB16I_EXT:
 429    case GL_RG16I:
 430    case GL_R16I:
 431    case GL_ALPHA16I_EXT:
 432    case GL_INTENSITY16I_EXT:
 433    case GL_LUMINANCE16I_EXT:
 434    case GL_LUMINANCE_ALPHA16I_EXT:
 435    case GL_RGBA8I_EXT:
 436    case GL_RGB8I_EXT:
 437    case GL_RG8I:
 438    case GL_R8I:
 439    case GL_ALPHA8I_EXT:
 440    case GL_INTENSITY8I_EXT:
 441    case GL_LUMINANCE8I_EXT:
 442    case GL_LUMINANCE_ALPHA8I_EXT:
 443       return GL_TRUE;
 444    default:
 445       return GL_FALSE;
 446    }
 447 }
 448
 449
 450 /**
 451  * Test if the given format is an integer (non-normalized) format.
 452  */
 453 GLboolean
 454 _mesa_is_enum_format_integer(GLenum format)
 455 {
 456    return _mesa_is_enum_format_unsigned_int(format) ||
 457           _mesa_is_enum_format_signed_int(format);
 458 }
 459
 460
 461 /**
 462  * Test if the given type is an integer (non-normalized) format.
 463  */
 464 GLboolean
 465 _mesa_is_type_integer(GLenum type)
 466 {
 467    switch (type) {
 468    case GL_INT:
 469    case GL_UNSIGNED_INT:
 470    case GL_SHORT:
 471    case GL_UNSIGNED_SHORT:
 472    case GL_BYTE:
 473    case GL_UNSIGNED_BYTE:
 474       return GL_TRUE;
 475    default:
 476       return GL_FALSE;
 477    }
 478 }
 479
 480
 481 /**
 482  * Test if the given format or type is an integer (non-normalized) format.
 483  */
 484 extern GLboolean
 485 _mesa_is_enum_format_or_type_integer(GLenum format, GLenum type)
 486 {
 487    return _mesa_is_enum_format_integer(format) || _mesa_is_type_integer(type);
 488 }
 489
 490
 491 GLboolean
 492 _mesa_is_type_unsigned(GLenum type)
 493 {
 494    switch (type) {
 495    case GL_UNSIGNED_INT:
 496    case GL_UNSIGNED_INT_8_8_8_8:
 497    case GL_UNSIGNED_INT_8_8_8_8_REV:
 498    case GL_UNSIGNED_INT_10_10_10_2:
 499    case GL_UNSIGNED_INT_2_10_10_10_REV:
 500
 501    case GL_UNSIGNED_SHORT:
 502    case GL_UNSIGNED_SHORT_4_4_4_4:
 503    case GL_UNSIGNED_SHORT_5_5_5_1:
 504    case GL_UNSIGNED_SHORT_5_6_5:
 505    case GL_UNSIGNED_SHORT_5_6_5_REV:
 506    case GL_UNSIGNED_SHORT_4_4_4_4_REV:
 507    case GL_UNSIGNED_SHORT_1_5_5_5_REV:
 508    case GL_UNSIGNED_SHORT_8_8_MESA:
 509    case GL_UNSIGNED_SHORT_8_8_REV_MESA:
 510
 511    case GL_UNSIGNED_BYTE:
 512    case GL_UNSIGNED_BYTE_3_3_2:
 513    case GL_UNSIGNED_BYTE_2_3_3_REV:
 514       return GL_TRUE;
 515
 516    default:
 517       return GL_FALSE;
 518    }
 519 }
 520
 521
 522 /**
 523  * Test if the given image format is a color/RGBA format (i.e., not color
 524  * index, depth, stencil, etc).
 525  * \param format  the image format value (may by an internal texture format)
 526  * \return GL_TRUE if its a color/RGBA format, GL_FALSE otherwise.
 527  */
 528 GLboolean
 529 _mesa_is_color_format(GLenum format)
 530 {
 531    switch (format) {
 532       case GL_RED:
 533       case GL_GREEN:
 534       case GL_BLUE:
 535       case GL_ALPHA:
 536       case GL_ALPHA4:
 537       case GL_ALPHA8:
 538       case GL_ALPHA12:
 539       case GL_ALPHA16:
 540       case 1:
 541       case GL_LUMINANCE:
 542       case GL_LUMINANCE4:
 543       case GL_LUMINANCE8:
 544       case GL_LUMINANCE12:
 545       case GL_LUMINANCE16:
 546       case 2:
 547       case GL_LUMINANCE_ALPHA:
 548       case GL_LUMINANCE4_ALPHA4:
 549       case GL_LUMINANCE6_ALPHA2:
 550       case GL_LUMINANCE8_ALPHA8:
 551       case GL_LUMINANCE12_ALPHA4:
 552       case GL_LUMINANCE12_ALPHA12:
 553       case GL_LUMINANCE16_ALPHA16:
 554       case GL_INTENSITY:
 555       case GL_INTENSITY4:
 556       case GL_INTENSITY8:
 557       case GL_INTENSITY12:
 558       case GL_INTENSITY16:
 559       case GL_R8:
 560       case GL_R16:
 561       case GL_RG:
 562       case GL_RG8:
 563       case GL_RG16:
 564       case 3:
 565       case GL_RGB:
 566       case GL_BGR:
 567       case GL_R3_G3_B2:
 568       case GL_RGB4:
 569       case GL_RGB5:
 570       case GL_RGB565:
 571       case GL_RGB8:
 572       case GL_RGB10:
 573       case GL_RGB12:
 574       case GL_RGB16:
 575       case 4:
 576       case GL_ABGR_EXT:
 577       case GL_RGBA:
 578       case GL_BGRA:
 579       case GL_RGBA2:
 580       case GL_RGBA4:
 581       case GL_RGB5_A1:
 582       case GL_RGBA8:
 583       case GL_RGB10_A2:
 584       case GL_RGBA12:
 585       case GL_RGBA16:
 586       /* float texture formats */
 587       case GL_ALPHA16F_ARB:
 588       case GL_ALPHA32F_ARB:
 589       case GL_LUMINANCE16F_ARB:
 590       case GL_LUMINANCE32F_ARB:
 591       case GL_LUMINANCE_ALPHA16F_ARB:
 592       case GL_LUMINANCE_ALPHA32F_ARB:
 593       case GL_INTENSITY16F_ARB:
 594       case GL_INTENSITY32F_ARB:
 595       case GL_R16F:
 596       case GL_R32F:
 597       case GL_RG16F:
 598       case GL_RG32F:
 599       case GL_RGB16F_ARB:
 600       case GL_RGB32F_ARB:
 601       case GL_RGBA16F_ARB:
 602       case GL_RGBA32F_ARB:
 603       /* compressed formats */
 604       case GL_COMPRESSED_ALPHA:
 605       case GL_COMPRESSED_LUMINANCE:
 606       case GL_COMPRESSED_LUMINANCE_ALPHA:
 607       case GL_COMPRESSED_INTENSITY:
 608       case GL_COMPRESSED_RED:
 609       case GL_COMPRESSED_RG:
 610       case GL_COMPRESSED_RGB:
 611       case GL_COMPRESSED_RGBA:
 612       case GL_RGB_S3TC:
 613       case GL_RGB4_S3TC:
 614       case GL_RGBA_S3TC:
 615       case GL_RGBA4_S3TC:
 616       case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 617       case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 618       case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 619       case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 620       case GL_COMPRESSED_RGB_FXT1_3DFX:
 621       case GL_COMPRESSED_RGBA_FXT1_3DFX:
 622       case GL_SRGB_EXT:
 623       case GL_SRGB8_EXT:
 624       case GL_SRGB_ALPHA_EXT:
 625       case GL_SRGB8_ALPHA8_EXT:
 626       case GL_SLUMINANCE_ALPHA_EXT:
 627       case GL_SLUMINANCE8_ALPHA8_EXT:
 628       case GL_SLUMINANCE_EXT:
 629       case GL_SLUMINANCE8_EXT:
 630       case GL_COMPRESSED_SRGB_EXT:
 631       case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 632       case GL_COMPRESSED_SRGB_ALPHA_EXT:
 633       case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 634       case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 635       case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 636       case GL_COMPRESSED_SLUMINANCE_EXT:
 637       case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 638       case GL_COMPRESSED_RED_RGTC1:
 639       case GL_COMPRESSED_SIGNED_RED_RGTC1:
 640       case GL_COMPRESSED_RG_RGTC2:
 641       case GL_COMPRESSED_SIGNED_RG_RGTC2:
 642       case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
 643       case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
 644       case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
 645       case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
 646       case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
 647       case GL_ETC1_RGB8_OES:
 648       case GL_COMPRESSED_RGB8_ETC2:
 649       case GL_COMPRESSED_SRGB8_ETC2:
 650       case GL_COMPRESSED_RGBA8_ETC2_EAC:
 651       case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:
 652       case GL_COMPRESSED_R11_EAC:
 653       case GL_COMPRESSED_RG11_EAC:
 654       case GL_COMPRESSED_SIGNED_R11_EAC:
 655       case GL_COMPRESSED_SIGNED_RG11_EAC:
 656       case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
 657       case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:
 658       /* generic integer formats */
 659       case GL_RED_INTEGER_EXT:
 660       case GL_GREEN_INTEGER_EXT:
 661       case GL_BLUE_INTEGER_EXT:
 662       case GL_ALPHA_INTEGER_EXT:
 663       case GL_RGB_INTEGER_EXT:
 664       case GL_RGBA_INTEGER_EXT:
 665       case GL_BGR_INTEGER_EXT:
 666       case GL_BGRA_INTEGER_EXT:
 667       case GL_RG_INTEGER:
 668       case GL_LUMINANCE_INTEGER_EXT:
 669       case GL_LUMINANCE_ALPHA_INTEGER_EXT:
 670       /* sized integer formats */
 671       case GL_RGBA32UI_EXT:
 672       case GL_RGB32UI_EXT:
 673       case GL_RG32UI:
 674       case GL_R32UI:
 675       case GL_ALPHA32UI_EXT:
 676       case GL_INTENSITY32UI_EXT:
 677       case GL_LUMINANCE32UI_EXT:
 678       case GL_LUMINANCE_ALPHA32UI_EXT:
 679       case GL_RGBA16UI_EXT:
 680       case GL_RGB16UI_EXT:
 681       case GL_RG16UI:
 682       case GL_R16UI:
 683       case GL_ALPHA16UI_EXT:
 684       case GL_INTENSITY16UI_EXT:
 685       case GL_LUMINANCE16UI_EXT:
 686       case GL_LUMINANCE_ALPHA16UI_EXT:
 687       case GL_RGBA8UI_EXT:
 688       case GL_RGB8UI_EXT:
 689       case GL_RG8UI:
 690       case GL_R8UI:
 691       case GL_ALPHA8UI_EXT:
 692       case GL_INTENSITY8UI_EXT:
 693       case GL_LUMINANCE8UI_EXT:
 694       case GL_LUMINANCE_ALPHA8UI_EXT:
 695       case GL_RGBA32I_EXT:
 696       case GL_RGB32I_EXT:
 697       case GL_RG32I:
 698       case GL_R32I:
 699       case GL_ALPHA32I_EXT:
 700       case GL_INTENSITY32I_EXT:
 701       case GL_LUMINANCE32I_EXT:
 702       case GL_LUMINANCE_ALPHA32I_EXT:
 703       case GL_RGBA16I_EXT:
 704       case GL_RGB16I_EXT:
 705       case GL_RG16I:
 706       case GL_R16I:
 707       case GL_ALPHA16I_EXT:
 708       case GL_INTENSITY16I_EXT:
 709       case GL_LUMINANCE16I_EXT:
 710       case GL_LUMINANCE_ALPHA16I_EXT:
 711       case GL_RGBA8I_EXT:
 712       case GL_RGB8I_EXT:
 713       case GL_RG8I:
 714       case GL_R8I:
 715       case GL_ALPHA8I_EXT:
 716       case GL_INTENSITY8I_EXT:
 717       case GL_LUMINANCE8I_EXT:
 718       case GL_LUMINANCE_ALPHA8I_EXT:
 719       /* signed, normalized texture formats */
 720       case GL_RED_SNORM:
 721       case GL_R8_SNORM:
 722       case GL_R16_SNORM:
 723       case GL_RG_SNORM:
 724       case GL_RG8_SNORM:
 725       case GL_RG16_SNORM:
 726       case GL_RGB_SNORM:
 727       case GL_RGB8_SNORM:
 728       case GL_RGB16_SNORM:
 729       case GL_RGBA_SNORM:
 730       case GL_RGBA8_SNORM:
 731       case GL_RGBA16_SNORM:
 732       case GL_ALPHA_SNORM:
 733       case GL_ALPHA8_SNORM:
 734       case GL_ALPHA16_SNORM:
 735       case GL_LUMINANCE_SNORM:
 736       case GL_LUMINANCE8_SNORM:
 737       case GL_LUMINANCE16_SNORM:
 738       case GL_LUMINANCE_ALPHA_SNORM:
 739       case GL_LUMINANCE8_ALPHA8_SNORM:
 740       case GL_LUMINANCE16_ALPHA16_SNORM:
 741       case GL_INTENSITY_SNORM:
 742       case GL_INTENSITY8_SNORM:
 743       case GL_INTENSITY16_SNORM:
 744       case GL_RGB9_E5:
 745       case GL_R11F_G11F_B10F:
 746       case GL_RGB10_A2UI:
 747          return GL_TRUE;
 748       case GL_YCBCR_MESA:  /* not considered to be RGB */
 749          /* fall-through */
 750       default:
 751          return GL_FALSE;
 752    }
 753 }
 754
 755
 756 /**
 757  * Test if the given image format is a depth component format.
 758  */
 759 GLboolean
 760 _mesa_is_depth_format(GLenum format)
 761 {
 762    switch (format) {
 763       case GL_DEPTH_COMPONENT:
 764       case GL_DEPTH_COMPONENT16:
 765       case GL_DEPTH_COMPONENT24:
 766       case GL_DEPTH_COMPONENT32:
 767       case GL_DEPTH_COMPONENT32F:
 768          return GL_TRUE;
 769       default:
 770          return GL_FALSE;
 771    }
 772 }
 773
 774
 775 /**
 776  * Test if the given image format is a stencil format.
 777  */
 778 GLboolean
 779 _mesa_is_stencil_format(GLenum format)
 780 {
 781    switch (format) {
 782       case GL_STENCIL_INDEX:
 783          return GL_TRUE;
 784       default:
 785          return GL_FALSE;
 786    }
 787 }
 788
 789
 790 /**
 791  * Test if the given image format is a YCbCr format.
 792  */
 793 GLboolean
 794 _mesa_is_ycbcr_format(GLenum format)
 795 {
 796    switch (format) {
 797       case GL_YCBCR_MESA:
 798          return GL_TRUE;
 799       default:
 800          return GL_FALSE;
 801    }
 802 }
 803
 804
 805 /**
 806  * Test if the given image format is a depth+stencil format.
 807  */
 808 GLboolean
 809 _mesa_is_depthstencil_format(GLenum format)
 810 {
 811    switch (format) {
 812       case GL_DEPTH24_STENCIL8_EXT:
 813       case GL_DEPTH_STENCIL_EXT:
 814       case GL_DEPTH32F_STENCIL8:
 815          return GL_TRUE;
 816       default:
 817          return GL_FALSE;
 818    }
 819 }
 820
 821
 822 /**
 823  * Test if the given image format is a depth or stencil format.
 824  */
 825 GLboolean
 826 _mesa_is_depth_or_stencil_format(GLenum format)
 827 {
 828    switch (format) {
 829       case GL_DEPTH_COMPONENT:
 830       case GL_DEPTH_COMPONENT16:
 831       case GL_DEPTH_COMPONENT24:
 832       case GL_DEPTH_COMPONENT32:
 833       case GL_STENCIL_INDEX:
 834       case GL_STENCIL_INDEX1_EXT:
 835       case GL_STENCIL_INDEX4_EXT:
 836       case GL_STENCIL_INDEX8_EXT:
 837       case GL_STENCIL_INDEX16_EXT:
 838       case GL_DEPTH_STENCIL_EXT:
 839       case GL_DEPTH24_STENCIL8_EXT:
 840       case GL_DEPTH_COMPONENT32F:
 841       case GL_DEPTH32F_STENCIL8:
 842          return GL_TRUE;
 843       default:
 844          return GL_FALSE;
 845    }
 846 }
 847
 848
 849 /**
 850  * Test if the given image format is a dudv format.
 851  */
 852 GLboolean
 853 _mesa_is_dudv_format(GLenum format)
 854 {
 855    switch (format) {
 856       case GL_DUDV_ATI:
 857       case GL_DU8DV8_ATI:
 858          return GL_TRUE;
 859       default:
 860          return GL_FALSE;
 861    }
 862 }
 863
 864
 865 /**
 866  * Test if an image format is a supported compressed format.
 867  * \param format the internal format token provided by the user.
 868  * \return GL_TRUE if compressed, GL_FALSE if uncompressed
 869  */
 870 GLboolean
 871 _mesa_is_compressed_format(struct gl_context *ctx, GLenum format)
 872 {
 873    switch (format) {
 874    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 875    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 876    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 877    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 878       /* Assume that the ANGLE flag will always be set if the EXT flag is set.
 879        */
 880       return ctx->Extensions.ANGLE_texture_compression_dxt;
 881    case GL_RGB_S3TC:
 882    case GL_RGB4_S3TC:
 883    case GL_RGBA_S3TC:
 884    case GL_RGBA4_S3TC:
 885       return _mesa_is_desktop_gl(ctx) &&
 886          ctx->Extensions.ANGLE_texture_compression_dxt;
 887    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 888    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 889    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 890    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 891       return _mesa_is_desktop_gl(ctx)
 892          && ctx->Extensions.EXT_texture_sRGB
 893          && ctx->Extensions.EXT_texture_compression_s3tc;
 894    case GL_COMPRESSED_RGB_FXT1_3DFX:
 895    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 896       return _mesa_is_desktop_gl(ctx)
 897          && ctx->Extensions.TDFX_texture_compression_FXT1;
 898    case GL_COMPRESSED_RED_RGTC1:
 899    case GL_COMPRESSED_SIGNED_RED_RGTC1:
 900    case GL_COMPRESSED_RG_RGTC2:
 901    case GL_COMPRESSED_SIGNED_RG_RGTC2:
 902       return _mesa_is_desktop_gl(ctx)
 903          && ctx->Extensions.ARB_texture_compression_rgtc;
 904    case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
 905    case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
 906    case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
 907    case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
 908       return ctx->API == API_OPENGL_COMPAT
 909          && ctx->Extensions.EXT_texture_compression_latc;
 910    case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
 911       return ctx->API == API_OPENGL_COMPAT
 912          && ctx->Extensions.ATI_texture_compression_3dc;
 913    case GL_ETC1_RGB8_OES:
 914       return _mesa_is_gles(ctx)
 915          && ctx->Extensions.OES_compressed_ETC1_RGB8_texture;
 916    case GL_COMPRESSED_RGB8_ETC2:
 917    case GL_COMPRESSED_SRGB8_ETC2:
 918    case GL_COMPRESSED_RGBA8_ETC2_EAC:
 919    case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:
 920    case GL_COMPRESSED_R11_EAC:
 921    case GL_COMPRESSED_RG11_EAC:
 922    case GL_COMPRESSED_SIGNED_R11_EAC:
 923    case GL_COMPRESSED_SIGNED_RG11_EAC:
 924    case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
 925    case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:
 926       return _mesa_is_gles3(ctx) || ctx->Extensions.ARB_ES3_compatibility;
 927    case GL_PALETTE4_RGB8_OES:
 928    case GL_PALETTE4_RGBA8_OES:
 929    case GL_PALETTE4_R5_G6_B5_OES:
 930    case GL_PALETTE4_RGBA4_OES:
 931    case GL_PALETTE4_RGB5_A1_OES:
 932    case GL_PALETTE8_RGB8_OES:
 933    case GL_PALETTE8_RGBA8_OES:
 934    case GL_PALETTE8_R5_G6_B5_OES:
 935    case GL_PALETTE8_RGBA4_OES:
 936    case GL_PALETTE8_RGB5_A1_OES:
 937       return ctx->API == API_OPENGLES;
 938    default:
 939       return GL_FALSE;
 940    }
 941 }
 942
 943
 944 /**
 945  * Convert various base formats to the cooresponding integer format.
 946  */
 947 GLenum
 948 _mesa_base_format_to_integer_format(GLenum format)
 949 {
 950    switch(format) {
 951    case GL_RED:
 952       return GL_RED_INTEGER;
 953    case GL_GREEN:
 954       return GL_GREEN_INTEGER;
 955    case GL_BLUE:
 956       return GL_BLUE_INTEGER;
 957    case GL_RG:
 958       return GL_RG_INTEGER;
 959    case GL_RGB:
 960       return GL_RGB_INTEGER;
 961    case GL_RGBA:
 962       return GL_RGBA_INTEGER;
 963    case GL_BGR:
 964       return GL_BGR_INTEGER;
 965    case GL_BGRA:
 966       return GL_BGRA_INTEGER;
 967    case GL_ALPHA:
 968       return GL_ALPHA_INTEGER;
 969    case GL_LUMINANCE:
 970       return GL_LUMINANCE_INTEGER_EXT;
 971    case GL_LUMINANCE_ALPHA:
 972       return GL_LUMINANCE_ALPHA_INTEGER_EXT;
 973    }
 974
 975    return format;
 976 }
 977
 978
 979 /**
 980  * Does the given base texture/renderbuffer format have the channel
 981  * named by 'pname'?
 982  */
 983 GLboolean
 984 _mesa_base_format_has_channel(GLenum base_format, GLenum pname)
 985 {
 986    switch (pname) {
 987    case GL_TEXTURE_RED_SIZE:
 988    case GL_TEXTURE_RED_TYPE:
 989    case GL_RENDERBUFFER_RED_SIZE_EXT:
 990    case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
 991       if (base_format == GL_RED ||
 992           base_format == GL_RG ||
 993           base_format == GL_RGB ||
 994           base_format == GL_RGBA) {
 995          return GL_TRUE;
 996       }
 997       return GL_FALSE;
 998    case GL_TEXTURE_GREEN_SIZE:
 999    case GL_TEXTURE_GREEN_TYPE:
1000    case GL_RENDERBUFFER_GREEN_SIZE_EXT:
1001    case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
1002       if (base_format == GL_RG ||
1003           base_format == GL_RGB ||
1004           base_format == GL_RGBA) {
1005          return GL_TRUE;
1006       }
1007       return GL_FALSE;
1008    case GL_TEXTURE_BLUE_SIZE:
1009    case GL_TEXTURE_BLUE_TYPE:
1010    case GL_RENDERBUFFER_BLUE_SIZE_EXT:
1011    case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
1012       if (base_format == GL_RGB ||
1013           base_format == GL_RGBA) {
1014          return GL_TRUE;
1015       }
1016       return GL_FALSE;
1017    case GL_TEXTURE_ALPHA_SIZE:
1018    case GL_TEXTURE_ALPHA_TYPE:
1019    case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
1020    case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
1021       if (base_format == GL_RGBA ||
1022           base_format == GL_ALPHA ||
1023           base_format == GL_LUMINANCE_ALPHA) {
1024          return GL_TRUE;
1025       }
1026       return GL_FALSE;
1027    case GL_TEXTURE_LUMINANCE_SIZE:
1028    case GL_TEXTURE_LUMINANCE_TYPE:
1029       if (base_format == GL_LUMINANCE ||
1030           base_format == GL_LUMINANCE_ALPHA) {
1031          return GL_TRUE;
1032       }
1033       return GL_FALSE;
1034    case GL_TEXTURE_INTENSITY_SIZE:
1035    case GL_TEXTURE_INTENSITY_TYPE:
1036       if (base_format == GL_INTENSITY) {
1037          return GL_TRUE;
1038       }
1039       return GL_FALSE;
1040    case GL_TEXTURE_DEPTH_SIZE:
1041    case GL_TEXTURE_DEPTH_TYPE:
1042    case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
1043    case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
1044       if (base_format == GL_DEPTH_STENCIL ||
1045           base_format == GL_DEPTH_COMPONENT) {
1046          return GL_TRUE;
1047       }
1048       return GL_FALSE;
1049    case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
1050    case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
1051       if (base_format == GL_DEPTH_STENCIL ||
1052           base_format == GL_STENCIL_INDEX) {
1053          return GL_TRUE;
1054       }
1055       return GL_FALSE;
1056    default:
1057       _mesa_warning(NULL, "%s: Unexpected channel token 0x%x\n",
1058                     __FUNCTION__, pname);
1059       return GL_FALSE;
1060    }
1061
1062    return GL_FALSE;
1063 }
1064
1065
1066 /**
1067  * Returns the number of channels/components for a base format.
1068  */
1069 GLint
1070 _mesa_base_format_component_count(GLenum base_format)
1071 {
1072    switch (base_format) {
1073    case GL_RED:
1074    case GL_ALPHA:
1075    case GL_INTENSITY:
1076    case GL_DEPTH_COMPONENT:
1077       return 1;
1078    case GL_RG:
1079    case GL_LUMINANCE_ALPHA:
1080    case GL_DEPTH_STENCIL:
1081       return 2;
1082    case GL_RGB:
1083       return 3;
1084    case GL_RGBA:
1085       return 4;
1086    default:
1087       return -1;
1088    }
1089 }
1090
1091
1092 /**
1093  * If format is a generic compressed format, return the corresponding
1094  * non-compressed format.  For other formats, return the format as-is.
1095  */
1096 GLenum
1097 _mesa_generic_compressed_format_to_uncompressed_format(GLenum format)
1098 {
1099    switch (format) {
1100    case GL_COMPRESSED_RED:
1101       return GL_RED;
1102    case GL_COMPRESSED_RG:
1103       return GL_RG;
1104    case GL_COMPRESSED_RGB:
1105       return GL_RGB;
1106    case GL_COMPRESSED_RGBA:
1107       return GL_RGBA;
1108    case GL_COMPRESSED_ALPHA:
1109       return GL_ALPHA;
1110    case GL_COMPRESSED_LUMINANCE:
1111       return GL_LUMINANCE;
1112    case GL_COMPRESSED_LUMINANCE_ALPHA:
1113       return GL_LUMINANCE_ALPHA;
1114    case GL_COMPRESSED_INTENSITY:
1115       return GL_INTENSITY;
1116    /* sRGB formats */
1117    case GL_COMPRESSED_SRGB:
1118       return GL_SRGB;
1119    case GL_COMPRESSED_SRGB_ALPHA:
1120       return GL_SRGB_ALPHA;
1121    case GL_COMPRESSED_SLUMINANCE:
1122       return GL_SLUMINANCE;
1123    case GL_COMPRESSED_SLUMINANCE_ALPHA:
1124       return GL_SLUMINANCE_ALPHA;
1125    default:
1126       return format;
1127    }
1128 }
1129
1130
1131 /**
1132  * Return the equivalent non-generic internal format.
1133  * This is useful for comparing whether two internal formats are equivalent.
1134  */
1135 GLenum
1136 _mesa_get_nongeneric_internalformat(GLenum format)
1137 {
1138    switch (format) {
1139    /* GL 1.1 formats. */
1140    case 4:
1141    case GL_RGBA:
1142       return GL_RGBA8;
1143    case 3:
1144    case GL_RGB:
1145       return GL_RGB8;
1146    case 2:
1147    case GL_LUMINANCE_ALPHA:
1148       return GL_LUMINANCE8_ALPHA8;
1149    case 1:
1150    case GL_LUMINANCE:
1151       return GL_LUMINANCE8;
1152    case GL_ALPHA:
1153       return GL_ALPHA8;
1154    case GL_INTENSITY:
1155       return GL_INTENSITY8;
1156
1157    /* GL_ARB_texture_rg */
1158    case GL_RED:
1159       return GL_R8;
1160    case GL_RG:
1161       return GL_RG8;
1162
1163    /* GL_EXT_texture_sRGB */
1164    case GL_SRGB:
1165       return GL_SRGB8;
1166    case GL_SRGB_ALPHA:
1167       return GL_SRGB8_ALPHA8;
1168    case GL_SLUMINANCE:
1169       return GL_SLUMINANCE8;
1170    case GL_SLUMINANCE_ALPHA:
1171       return GL_SLUMINANCE8_ALPHA8;
1172
1173    /* GL_EXT_texture_snorm */
1174    case GL_RGBA_SNORM:
1175       return GL_RGBA8_SNORM;
1176    case GL_RGB_SNORM:
1177       return GL_RGB8_SNORM;
1178    case GL_RG_SNORM:
1179       return GL_RG8_SNORM;
1180    case GL_RED_SNORM:
1181       return GL_R8_SNORM;
1182    case GL_LUMINANCE_ALPHA_SNORM:
1183       return GL_LUMINANCE8_ALPHA8_SNORM;
1184    case GL_LUMINANCE_SNORM:
1185       return GL_LUMINANCE8_SNORM;
1186    case GL_ALPHA_SNORM:
1187       return GL_ALPHA8_SNORM;
1188    case GL_INTENSITY_SNORM:
1189       return GL_INTENSITY8_SNORM;
1190
1191    default:
1192       return format;
1193    }
1194 }
1195
1196
1197 /**
1198  * Convert an sRGB internal format to linear.
1199  */
1200 GLenum
1201 _mesa_get_linear_internalformat(GLenum format)
1202 {
1203    switch (format) {
1204    case GL_SRGB:
1205       return GL_RGB;
1206    case GL_SRGB_ALPHA:
1207       return GL_RGBA;
1208    case GL_SRGB8:
1209       return GL_RGB8;
1210    case GL_SRGB8_ALPHA8:
1211       return GL_RGBA8;
1212    case GL_SLUMINANCE8:
1213       return GL_LUMINANCE8;
1214    case GL_SLUMINANCE:
1215       return GL_LUMINANCE;
1216    case GL_SLUMINANCE_ALPHA:
1217       return GL_LUMINANCE_ALPHA;
1218    case GL_SLUMINANCE8_ALPHA8:
1219       return GL_LUMINANCE8_ALPHA8;
1220    default:
1221       return format;
1222    }
1223 }
1224
1225
1226 /**
1227  * Do error checking of format/type combinations for glReadPixels,
1228  * glDrawPixels and glTex[Sub]Image.  Note that depending on the format
1229  * and type values, we may either generate GL_INVALID_OPERATION or
1230  * GL_INVALID_ENUM.
1231  *
1232  * \param format pixel format.
1233  * \param type pixel type.
1234  *
1235  * \return GL_INVALID_ENUM, GL_INVALID_OPERATION or GL_NO_ERROR
1236  */
1237 GLenum
1238 _mesa_error_check_format_and_type(const struct gl_context *ctx,
1239                                   GLenum format, GLenum type)
1240 {
1241    /* special type-based checks (see glReadPixels, glDrawPixels error lists) */
1242    switch (type) {
1243    case GL_BITMAP:
1244       if (format != GL_COLOR_INDEX && format != GL_STENCIL_INDEX) {
1245          return GL_INVALID_ENUM;
1246       }
1247       break;
1248
1249    case GL_UNSIGNED_BYTE_3_3_2:
1250    case GL_UNSIGNED_BYTE_2_3_3_REV:
1251    case GL_UNSIGNED_SHORT_5_6_5:
1252    case GL_UNSIGNED_SHORT_5_6_5_REV:
1253       if (format == GL_RGB) {
1254          break; /* OK */
1255       }
1256       if (format == GL_RGB_INTEGER_EXT &&
1257           ctx->Extensions.ARB_texture_rgb10_a2ui) {
1258          break; /* OK */
1259       }
1260       return GL_INVALID_OPERATION;
1261
1262    case GL_UNSIGNED_SHORT_4_4_4_4:
1263    case GL_UNSIGNED_SHORT_4_4_4_4_REV:
1264    case GL_UNSIGNED_SHORT_5_5_5_1:
1265    case GL_UNSIGNED_SHORT_1_5_5_5_REV:
1266    case GL_UNSIGNED_INT_8_8_8_8:
1267    case GL_UNSIGNED_INT_8_8_8_8_REV:
1268    case GL_UNSIGNED_INT_10_10_10_2:
1269    case GL_UNSIGNED_INT_2_10_10_10_REV:
1270       if (format == GL_RGBA ||
1271           format == GL_BGRA ||
1272           format == GL_ABGR_EXT) {
1273          break; /* OK */
1274       }
1275       if ((format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT) &&
1276           ctx->Extensions.ARB_texture_rgb10_a2ui) {
1277          break; /* OK */
1278       }
1279       if (type == GL_UNSIGNED_INT_2_10_10_10_REV && format == GL_RGB &&
1280           ctx->API == API_OPENGLES2) {
1281          break; /* OK by GL_EXT_texture_type_2_10_10_10_REV */
1282       }
1283       return GL_INVALID_OPERATION;
1284
1285    case GL_UNSIGNED_INT_24_8:
1286       if (format != GL_DEPTH_STENCIL) {
1287          return GL_INVALID_OPERATION;
1288       }
1289       return GL_NO_ERROR;
1290
1291    case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
1292       if (!ctx->Extensions.ARB_depth_buffer_float) {
1293          return GL_INVALID_ENUM;
1294       }
1295       if (format != GL_DEPTH_STENCIL) {
1296          return GL_INVALID_OPERATION;
1297       }
1298       return GL_NO_ERROR;
1299
1300    case GL_UNSIGNED_INT_10F_11F_11F_REV:
1301       if (!ctx->Extensions.EXT_packed_float) {
1302          return GL_INVALID_ENUM;
1303       }
1304       if (format != GL_RGB) {
1305          return GL_INVALID_OPERATION;
1306       }
1307       return GL_NO_ERROR;
1308
1309    default:
1310       ; /* fall-through */
1311    }
1312
1313    /* now, for each format, check the type for compatibility */
1314    switch (format) {
1315       case GL_COLOR_INDEX:
1316       case GL_STENCIL_INDEX:
1317          switch (type) {
1318             case GL_BITMAP:
1319             case GL_BYTE:
1320             case GL_UNSIGNED_BYTE:
1321             case GL_SHORT:
1322             case GL_UNSIGNED_SHORT:
1323             case GL_INT:
1324             case GL_UNSIGNED_INT:
1325             case GL_FLOAT:
1326             case GL_HALF_FLOAT:
1327                return GL_NO_ERROR;
1328             default:
1329                return GL_INVALID_ENUM;
1330          }
1331
1332       case GL_RED:
1333       case GL_GREEN:
1334       case GL_BLUE:
1335       case GL_ALPHA:
1336 #if 0 /* not legal!  see table 3.6 of the 1.5 spec */
1337       case GL_INTENSITY:
1338 #endif
1339       case GL_LUMINANCE:
1340       case GL_LUMINANCE_ALPHA:
1341       case GL_DEPTH_COMPONENT:
1342          switch (type) {
1343             case GL_BYTE:
1344             case GL_UNSIGNED_BYTE:
1345             case GL_SHORT:
1346             case GL_UNSIGNED_SHORT:
1347             case GL_INT:
1348             case GL_UNSIGNED_INT:
1349             case GL_FLOAT:
1350             case GL_HALF_FLOAT:
1351                return GL_NO_ERROR;
1352             default:
1353                return GL_INVALID_ENUM;
1354          }
1355
1356       case GL_RG:
1357          if (!ctx->Extensions.ARB_texture_rg)
1358             return GL_INVALID_ENUM;
1359          switch (type) {
1360             case GL_BYTE:
1361             case GL_UNSIGNED_BYTE:
1362             case GL_SHORT:
1363             case GL_UNSIGNED_SHORT:
1364             case GL_INT:
1365             case GL_UNSIGNED_INT:
1366             case GL_FLOAT:
1367             case GL_HALF_FLOAT:
1368                return GL_NO_ERROR;
1369             default:
1370                return GL_INVALID_ENUM;
1371          }
1372
1373       case GL_RGB:
1374          switch (type) {
1375             case GL_BYTE:
1376             case GL_UNSIGNED_BYTE:
1377             case GL_SHORT:
1378             case GL_UNSIGNED_SHORT:
1379             case GL_INT:
1380             case GL_UNSIGNED_INT:
1381             case GL_FLOAT:
1382             case GL_UNSIGNED_BYTE_3_3_2:
1383             case GL_UNSIGNED_BYTE_2_3_3_REV:
1384             case GL_UNSIGNED_SHORT_5_6_5:
1385             case GL_UNSIGNED_SHORT_5_6_5_REV:
1386             case GL_HALF_FLOAT:
1387                return GL_NO_ERROR;
1388             case GL_UNSIGNED_INT_2_10_10_10_REV:
1389                /* OK by GL_EXT_texture_type_2_10_10_10_REV */
1390                return (ctx->API == API_OPENGLES2)
1391                   ? GL_NO_ERROR : GL_INVALID_ENUM;
1392             case GL_UNSIGNED_INT_5_9_9_9_REV:
1393                return ctx->Extensions.EXT_texture_shared_exponent
1394                   ? GL_NO_ERROR : GL_INVALID_ENUM;
1395             case GL_UNSIGNED_INT_10F_11F_11F_REV:
1396                return ctx->Extensions.EXT_packed_float
1397                   ? GL_NO_ERROR : GL_INVALID_ENUM;
1398             default:
1399                return GL_INVALID_ENUM;
1400          }
1401
1402       case GL_BGR:
1403          switch (type) {
1404             /* NOTE: no packed types are supported with BGR.  That's
1405              * intentional, according to the GL spec.
1406              */
1407             case GL_BYTE:
1408             case GL_UNSIGNED_BYTE:
1409             case GL_SHORT:
1410             case GL_UNSIGNED_SHORT:
1411             case GL_INT:
1412             case GL_UNSIGNED_INT:
1413             case GL_FLOAT:
1414             case GL_HALF_FLOAT:
1415                return GL_NO_ERROR;
1416             default:
1417                return GL_INVALID_ENUM;
1418          }
1419
1420       case GL_RGBA:
1421       case GL_BGRA:
1422       case GL_ABGR_EXT:
1423          switch (type) {
1424             case GL_BYTE:
1425             case GL_UNSIGNED_BYTE:
1426             case GL_SHORT:
1427             case GL_UNSIGNED_SHORT:
1428             case GL_INT:
1429             case GL_UNSIGNED_INT:
1430             case GL_FLOAT:
1431             case GL_UNSIGNED_SHORT_4_4_4_4:
1432             case GL_UNSIGNED_SHORT_4_4_4_4_REV:
1433             case GL_UNSIGNED_SHORT_5_5_5_1:
1434             case GL_UNSIGNED_SHORT_1_5_5_5_REV:
1435             case GL_UNSIGNED_INT_8_8_8_8:
1436             case GL_UNSIGNED_INT_8_8_8_8_REV:
1437             case GL_UNSIGNED_INT_10_10_10_2:
1438             case GL_UNSIGNED_INT_2_10_10_10_REV:
1439             case GL_HALF_FLOAT:
1440                return GL_NO_ERROR;
1441             default:
1442                return GL_INVALID_ENUM;
1443          }
1444
1445       case GL_YCBCR_MESA:
1446          if (!ctx->Extensions.MESA_ycbcr_texture)
1447             return GL_INVALID_ENUM;
1448          if (type == GL_UNSIGNED_SHORT_8_8_MESA ||
1449              type == GL_UNSIGNED_SHORT_8_8_REV_MESA)
1450             return GL_NO_ERROR;
1451          else
1452             return GL_INVALID_OPERATION;
1453
1454       case GL_DEPTH_STENCIL:
1455          if (type == GL_UNSIGNED_INT_24_8)
1456             return GL_NO_ERROR;
1457          else if (ctx->Extensions.ARB_depth_buffer_float &&
1458              type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV)
1459             return GL_NO_ERROR;
1460          else
1461             return GL_INVALID_ENUM;
1462
1463       case GL_DUDV_ATI:
1464       case GL_DU8DV8_ATI:
1465          if (!ctx->Extensions.ATI_envmap_bumpmap)
1466             return GL_INVALID_ENUM;
1467          switch (type) {
1468             case GL_BYTE:
1469             case GL_UNSIGNED_BYTE:
1470             case GL_SHORT:
1471             case GL_UNSIGNED_SHORT:
1472             case GL_INT:
1473             case GL_UNSIGNED_INT:
1474             case GL_FLOAT:
1475                return GL_NO_ERROR;
1476             default:
1477                return GL_INVALID_ENUM;
1478          }
1479
1480       /* integer-valued formats */
1481       case GL_RED_INTEGER_EXT:
1482       case GL_GREEN_INTEGER_EXT:
1483       case GL_BLUE_INTEGER_EXT:
1484       case GL_ALPHA_INTEGER_EXT:
1485       case GL_RG_INTEGER:
1486          switch (type) {
1487             case GL_BYTE:
1488             case GL_UNSIGNED_BYTE:
1489             case GL_SHORT:
1490             case GL_UNSIGNED_SHORT:
1491             case GL_INT:
1492             case GL_UNSIGNED_INT:
1493                return (ctx->Version >= 30 ||
1494                        ctx->Extensions.EXT_texture_integer)
1495                   ? GL_NO_ERROR : GL_INVALID_ENUM;
1496             default:
1497                return GL_INVALID_ENUM;
1498          }
1499
1500       case GL_RGB_INTEGER_EXT:
1501          switch (type) {
1502             case GL_BYTE:
1503             case GL_UNSIGNED_BYTE:
1504             case GL_SHORT:
1505             case GL_UNSIGNED_SHORT:
1506             case GL_INT:
1507             case GL_UNSIGNED_INT:
1508                return (ctx->Version >= 30 ||
1509                        ctx->Extensions.EXT_texture_integer)
1510                   ? GL_NO_ERROR : GL_INVALID_ENUM;
1511             case GL_UNSIGNED_BYTE_3_3_2:
1512             case GL_UNSIGNED_BYTE_2_3_3_REV:
1513             case GL_UNSIGNED_SHORT_5_6_5:
1514             case GL_UNSIGNED_SHORT_5_6_5_REV:
1515                return ctx->Extensions.ARB_texture_rgb10_a2ui
1516                   ? GL_NO_ERROR : GL_INVALID_ENUM;
1517             default:
1518                return GL_INVALID_ENUM;
1519          }
1520
1521       case GL_BGR_INTEGER_EXT:
1522          switch (type) {
1523             case GL_BYTE:
1524             case GL_UNSIGNED_BYTE:
1525             case GL_SHORT:
1526             case GL_UNSIGNED_SHORT:
1527             case GL_INT:
1528             case GL_UNSIGNED_INT:
1529             /* NOTE: no packed formats w/ BGR format */
1530                return (ctx->Version >= 30 ||
1531                        ctx->Extensions.EXT_texture_integer)
1532                   ? GL_NO_ERROR : GL_INVALID_ENUM;
1533             default:
1534                return GL_INVALID_ENUM;
1535          }
1536
1537       case GL_RGBA_INTEGER_EXT:
1538       case GL_BGRA_INTEGER_EXT:
1539          switch (type) {
1540             case GL_BYTE:
1541             case GL_UNSIGNED_BYTE:
1542             case GL_SHORT:
1543             case GL_UNSIGNED_SHORT:
1544             case GL_INT:
1545             case GL_UNSIGNED_INT:
1546                return (ctx->Version >= 30 ||
1547                        ctx->Extensions.EXT_texture_integer)
1548                   ? GL_NO_ERROR : GL_INVALID_ENUM;
1549             case GL_UNSIGNED_SHORT_4_4_4_4:
1550             case GL_UNSIGNED_SHORT_4_4_4_4_REV:
1551             case GL_UNSIGNED_SHORT_5_5_5_1:
1552             case GL_UNSIGNED_SHORT_1_5_5_5_REV:
1553             case GL_UNSIGNED_INT_8_8_8_8:
1554             case GL_UNSIGNED_INT_8_8_8_8_REV:
1555             case GL_UNSIGNED_INT_10_10_10_2:
1556             case GL_UNSIGNED_INT_2_10_10_10_REV:
1557                return ctx->Extensions.ARB_texture_rgb10_a2ui
1558                   ? GL_NO_ERROR : GL_INVALID_ENUM;
1559             default:
1560                return GL_INVALID_ENUM;
1561          }
1562
1563       case GL_LUMINANCE_INTEGER_EXT:
1564       case GL_LUMINANCE_ALPHA_INTEGER_EXT:
1565          switch (type) {
1566             case GL_BYTE:
1567             case GL_UNSIGNED_BYTE:
1568             case GL_SHORT:
1569             case GL_UNSIGNED_SHORT:
1570             case GL_INT:
1571             case GL_UNSIGNED_INT:
1572                return ctx->Extensions.EXT_texture_integer
1573                   ? GL_NO_ERROR : GL_INVALID_ENUM;
1574             default:
1575                return GL_INVALID_ENUM;
1576          }
1577
1578       default:
1579          return GL_INVALID_ENUM;
1580    }
1581    return GL_NO_ERROR;
1582 }
1583
1584
1585 /**
1586  * Do error checking of format/type combinations for OpenGL ES glReadPixels
1587  * and glTex[Sub]Image.
1588  * \return error code, or GL_NO_ERROR.
1589  */
1590 GLenum
1591 _mesa_es_error_check_format_and_type(GLenum format, GLenum type,
1592                                      unsigned dimensions)
1593 {
1594    GLboolean type_valid = GL_TRUE;
1595
1596    switch (format) {
1597    case GL_ALPHA:
1598    case GL_LUMINANCE:
1599    case GL_LUMINANCE_ALPHA:
1600       type_valid = (type == GL_UNSIGNED_BYTE
1601                     || type == GL_FLOAT
1602                     || type == GL_HALF_FLOAT_OES);
1603       break;
1604
1605    case GL_RGB:
1606       type_valid = (type == GL_UNSIGNED_BYTE
1607                     || type == GL_UNSIGNED_SHORT_5_6_5
1608                     || type == GL_FLOAT
1609                     || type == GL_HALF_FLOAT_OES);
1610       break;
1611
1612    case GL_RGBA:
1613       type_valid = (type == GL_UNSIGNED_BYTE
1614                     || type == GL_UNSIGNED_SHORT_4_4_4_4
1615                     || type == GL_UNSIGNED_SHORT_5_5_5_1
1616                     || type == GL_FLOAT
1617                     || type == GL_HALF_FLOAT_OES
1618                     || type == GL_UNSIGNED_INT_2_10_10_10_REV);
1619       break;
1620
1621    case GL_DEPTH_COMPONENT:
1622       /* This format is filtered against invalid dimensionalities elsewhere.
1623        */
1624       type_valid = (type == GL_UNSIGNED_SHORT
1625                     || type == GL_UNSIGNED_INT);
1626       break;
1627
1628    case GL_DEPTH_STENCIL:
1629       /* This format is filtered against invalid dimensionalities elsewhere.
1630        */
1631       type_valid = (type == GL_UNSIGNED_INT_24_8);
1632       break;
1633
1634    case GL_BGRA_EXT:
1635       type_valid = (type == GL_UNSIGNED_BYTE);
1636
1637       /* This feels like a bug in the EXT_texture_format_BGRA8888 spec, but
1638        * the format does not appear to be allowed for 3D textures in OpenGL
1639        * ES.
1640        */
1641       if (dimensions != 2)
1642          return GL_INVALID_VALUE;
1643
1644       break;
1645
1646    default:
1647       return GL_INVALID_VALUE;
1648    }
1649
1650    return type_valid ? GL_NO_ERROR : GL_INVALID_OPERATION;
1651 }
1652
1653
1654 /**
1655  * Do error checking of format/type combinations for OpenGL ES 3
1656  * glTex[Sub]Image.
1657  * \return error code, or GL_NO_ERROR.
1658  */
1659 GLenum
1660 _mesa_es3_error_check_format_and_type(GLenum format, GLenum type,
1661                                       GLenum internalFormat)
1662 {
1663    switch (format) {
1664    case GL_RGBA:
1665       switch (type) {
1666       case GL_UNSIGNED_BYTE:
1667          switch (internalFormat) {
1668          case GL_RGBA:
1669          case GL_RGBA8:
1670          case GL_RGB5_A1:
1671          case GL_RGBA4:
1672          case GL_SRGB8_ALPHA8_EXT:
1673             break;
1674          default:
1675             return GL_INVALID_OPERATION;
1676          }
1677          break;
1678
1679       case GL_BYTE:
1680          if (internalFormat != GL_RGBA8_SNORM)
1681             return GL_INVALID_OPERATION;
1682          break;
1683
1684       case GL_UNSIGNED_SHORT_4_4_4_4:
1685          switch (internalFormat) {
1686          case GL_RGBA:
1687          case GL_RGBA4:
1688             break;
1689          default:
1690             return GL_INVALID_OPERATION;
1691          }
1692          break;
1693
1694       case GL_UNSIGNED_SHORT_5_5_5_1:
1695          switch (internalFormat) {
1696          case GL_RGBA:
1697          case GL_RGB5_A1:
1698             break;
1699          default:
1700             return GL_INVALID_OPERATION;
1701          }
1702          break;
1703
1704       case GL_UNSIGNED_INT_2_10_10_10_REV:
1705          switch (internalFormat) {
1706          case GL_RGBA: /* GL_EXT_texture_type_2_10_10_10_REV */
1707          case GL_RGB10_A2:
1708          case GL_RGB5_A1:
1709             break;
1710          default:
1711             return GL_INVALID_OPERATION;
1712          }
1713          break;
1714
1715       case GL_HALF_FLOAT:
1716          if (internalFormat != GL_RGBA16F)
1717             return GL_INVALID_OPERATION;
1718          break;
1719
1720       case GL_FLOAT:
1721          switch (internalFormat) {
1722          case GL_RGBA16F:
1723          case GL_RGBA32F:
1724             break;
1725          default:
1726             return GL_INVALID_OPERATION;
1727          }
1728          break;
1729
1730       default:
1731          return GL_INVALID_OPERATION;
1732       }
1733       break;
1734
1735    case GL_RGBA_INTEGER:
1736       switch (type) {
1737       case GL_UNSIGNED_BYTE:
1738          if (internalFormat != GL_RGBA8UI)
1739             return GL_INVALID_OPERATION;
1740          break;
1741
1742       case GL_BYTE:
1743          if (internalFormat != GL_RGBA8I)
1744             return GL_INVALID_OPERATION;
1745          break;
1746
1747       case GL_UNSIGNED_SHORT:
1748          if (internalFormat != GL_RGBA16UI)
1749             return GL_INVALID_OPERATION;
1750          break;
1751
1752       case GL_SHORT:
1753          if (internalFormat != GL_RGBA16I)
1754             return GL_INVALID_OPERATION;
1755          break;
1756
1757       case GL_UNSIGNED_INT:
1758          if (internalFormat != GL_RGBA32UI)
1759             return GL_INVALID_OPERATION;
1760          break;
1761
1762       case GL_INT:
1763          if (internalFormat != GL_RGBA32I)
1764             return GL_INVALID_OPERATION;
1765          break;
1766
1767       case GL_UNSIGNED_INT_2_10_10_10_REV:
1768          if (internalFormat != GL_RGB10_A2UI)
1769             return GL_INVALID_OPERATION;
1770          break;
1771
1772       default:
1773          return GL_INVALID_OPERATION;
1774       }
1775       break;
1776
1777    case GL_RGB:
1778       switch (type) {
1779       case GL_UNSIGNED_BYTE:
1780          switch (internalFormat) {
1781          case GL_RGB:
1782          case GL_RGB8:
1783          case GL_RGB565:
1784          case GL_SRGB8:
1785             break;
1786          default:
1787             return GL_INVALID_OPERATION;
1788          }
1789          break;
1790
1791       case GL_BYTE:
1792          if (internalFormat != GL_RGB8_SNORM)
1793             return GL_INVALID_OPERATION;
1794          break;
1795
1796       case GL_UNSIGNED_SHORT_5_6_5:
1797          switch (internalFormat) {
1798          case GL_RGB:
1799          case GL_RGB565:
1800             break;
1801          default:
1802             return GL_INVALID_OPERATION;
1803          }
1804          break;
1805
1806       case GL_UNSIGNED_INT_10F_11F_11F_REV:
1807          if (internalFormat != GL_R11F_G11F_B10F)
1808             return GL_INVALID_OPERATION;
1809          break;
1810
1811       case GL_UNSIGNED_INT_5_9_9_9_REV:
1812          if (internalFormat != GL_RGB9_E5)
1813             return GL_INVALID_OPERATION;
1814          break;
1815
1816       case GL_HALF_FLOAT:
1817          switch (internalFormat) {
1818          case GL_RGB16F:
1819          case GL_R11F_G11F_B10F:
1820          case GL_RGB9_E5:
1821             break;
1822          default:
1823             return GL_INVALID_OPERATION;
1824          }
1825          break;
1826
1827       case GL_FLOAT:
1828          switch (internalFormat) {
1829          case GL_RGB16F:
1830          case GL_RGB32F:
1831          case GL_R11F_G11F_B10F:
1832          case GL_RGB9_E5:
1833             break;
1834          default:
1835             return GL_INVALID_OPERATION;
1836          }
1837          break;
1838
1839       case GL_UNSIGNED_INT_2_10_10_10_REV:
1840          switch (internalFormat) {
1841          case GL_RGB: /* GL_EXT_texture_type_2_10_10_10_REV */
1842             break;
1843          default:
1844             return GL_INVALID_OPERATION;
1845          }
1846          break;
1847
1848       default:
1849          return GL_INVALID_OPERATION;
1850       }
1851       break;
1852
1853    case GL_RGB_INTEGER:
1854       switch (type) {
1855       case GL_UNSIGNED_BYTE:
1856          if (internalFormat != GL_RGB8UI)
1857             return GL_INVALID_OPERATION;
1858          break;
1859
1860       case GL_BYTE:
1861          if (internalFormat != GL_RGB8I)
1862             return GL_INVALID_OPERATION;
1863          break;
1864
1865       case GL_UNSIGNED_SHORT:
1866          if (internalFormat != GL_RGB16UI)
1867             return GL_INVALID_OPERATION;
1868          break;
1869
1870       case GL_SHORT:
1871          if (internalFormat != GL_RGB16I)
1872             return GL_INVALID_OPERATION;
1873          break;
1874
1875       case GL_UNSIGNED_INT:
1876          if (internalFormat != GL_RGB32UI)
1877             return GL_INVALID_OPERATION;
1878          break;
1879
1880       case GL_INT:
1881          if (internalFormat != GL_RGB32I)
1882             return GL_INVALID_OPERATION;
1883          break;
1884
1885       default:
1886          return GL_INVALID_OPERATION;
1887       }
1888       break;
1889
1890    case GL_RG:
1891       switch (type) {
1892       case GL_UNSIGNED_BYTE:
1893          if (internalFormat != GL_RG8)
1894             return GL_INVALID_OPERATION;
1895          break;
1896
1897       case GL_BYTE:
1898          if (internalFormat != GL_RG8_SNORM)
1899             return GL_INVALID_OPERATION;
1900          break;
1901
1902       case GL_HALF_FLOAT:
1903          if (internalFormat != GL_RG16F)
1904             return GL_INVALID_OPERATION;
1905          break;
1906
1907       case GL_FLOAT:
1908          switch (internalFormat) {
1909          case GL_RG16F:
1910          case GL_RG32F:
1911             break;
1912          default:
1913             return GL_INVALID_OPERATION;
1914          }
1915          break;
1916
1917       default:
1918          return GL_INVALID_OPERATION;
1919       }
1920       break;
1921
1922    case GL_RG_INTEGER:
1923       switch (type) {
1924       case GL_UNSIGNED_BYTE:
1925          if (internalFormat != GL_RG8UI)
1926             return GL_INVALID_OPERATION;
1927          break;
1928
1929       case GL_BYTE:
1930          if (internalFormat != GL_RG8I)
1931             return GL_INVALID_OPERATION;
1932          break;
1933
1934       case GL_UNSIGNED_SHORT:
1935          if (internalFormat != GL_RG16UI)
1936             return GL_INVALID_OPERATION;
1937          break;
1938
1939       case GL_SHORT:
1940          if (internalFormat != GL_RG16I)
1941             return GL_INVALID_OPERATION;
1942          break;
1943
1944       case GL_UNSIGNED_INT:
1945          if (internalFormat != GL_RG32UI)
1946             return GL_INVALID_OPERATION;
1947          break;
1948
1949       case GL_INT:
1950          if (internalFormat != GL_RG32I)
1951             return GL_INVALID_OPERATION;
1952          break;
1953
1954       default:
1955          return GL_INVALID_OPERATION;
1956       }
1957       break;
1958
1959    case GL_RED:
1960       switch (type) {
1961       case GL_UNSIGNED_BYTE:
1962          if (internalFormat != GL_R8)
1963             return GL_INVALID_OPERATION;
1964          break;
1965
1966       case GL_BYTE:
1967          if (internalFormat != GL_R8_SNORM)
1968             return GL_INVALID_OPERATION;
1969          break;
1970
1971       case GL_HALF_FLOAT:
1972          if (internalFormat != GL_R16F)
1973             return GL_INVALID_OPERATION;
1974          break;
1975
1976       case GL_FLOAT:
1977          switch (internalFormat) {
1978          case GL_R16F:
1979          case GL_R32F:
1980             break;
1981          default:
1982             return GL_INVALID_OPERATION;
1983          }
1984          break;
1985
1986       default:
1987          return GL_INVALID_OPERATION;
1988       }
1989       break;
1990
1991    case GL_RED_INTEGER:
1992       switch (type) {
1993       case GL_UNSIGNED_BYTE:
1994          if (internalFormat != GL_R8UI)
1995             return GL_INVALID_OPERATION;
1996          break;
1997
1998       case GL_BYTE:
1999          if (internalFormat != GL_R8I)
2000             return GL_INVALID_OPERATION;
2001          break;
2002
2003       case GL_UNSIGNED_SHORT:
2004          if (internalFormat != GL_R16UI)
2005             return GL_INVALID_OPERATION;
2006          break;
2007
2008       case GL_SHORT:
2009          if (internalFormat != GL_R16I)
2010             return GL_INVALID_OPERATION;
2011          break;
2012
2013       case GL_UNSIGNED_INT:
2014          if (internalFormat != GL_R32UI)
2015             return GL_INVALID_OPERATION;
2016          break;
2017
2018       case GL_INT:
2019          if (internalFormat != GL_R32I)
2020             return GL_INVALID_OPERATION;
2021          break;
2022
2023       default:
2024          return GL_INVALID_OPERATION;
2025       }
2026       break;
2027
2028    case GL_DEPTH_COMPONENT:
2029       switch (type) {
2030       case GL_UNSIGNED_SHORT:
2031          if (internalFormat != GL_DEPTH_COMPONENT
2032              && internalFormat != GL_DEPTH_COMPONENT16)
2033             return GL_INVALID_OPERATION;
2034          break;
2035
2036       case GL_UNSIGNED_INT:
2037          switch (internalFormat) {
2038          case GL_DEPTH_COMPONENT:
2039          case GL_DEPTH_COMPONENT16:
2040          case GL_DEPTH_COMPONENT24:
2041             break;
2042          default:
2043             return GL_INVALID_OPERATION;
2044          }
2045          break;
2046
2047       case GL_FLOAT:
2048          if (internalFormat != GL_DEPTH_COMPONENT32F)
2049             return GL_INVALID_OPERATION;
2050          break;
2051
2052       default:
2053          return GL_INVALID_OPERATION;
2054       }
2055       break;
2056
2057    case GL_DEPTH_STENCIL:
2058       switch (type) {
2059       case GL_UNSIGNED_INT_24_8:
2060          if (internalFormat != GL_DEPTH_STENCIL
2061              && internalFormat != GL_DEPTH24_STENCIL8)
2062             return GL_INVALID_OPERATION;
2063          break;
2064
2065       case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
2066          if (internalFormat != GL_DEPTH32F_STENCIL8)
2067             return GL_INVALID_OPERATION;
2068          break;
2069
2070       default:
2071          return GL_INVALID_OPERATION;
2072       }
2073       break;
2074
2075    case GL_ALPHA:
2076    case GL_LUMINANCE:
2077    case GL_LUMINANCE_ALPHA:
2078       if (type != GL_UNSIGNED_BYTE || format != internalFormat)
2079          return GL_INVALID_OPERATION;
2080       break;
2081    }
2082
2083    return GL_NO_ERROR;
2084 }