src/mesa/main/texformat.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.7
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  * Copyright (c) 2008-2009 VMware, Inc.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 /**
  28  * \file texformat.c
  29  * Texture formats.
  30  *
  31  * \author Gareth Hughes
  32  * \author Brian Paul
  33  */
  34
  35
  36 #include "context.h"
  37 #include "enums.h"
  38 #include "mfeatures.h"
  39 #include "mtypes.h"
  40 #include "texcompress.h"
  41 #include "texformat.h"
  42
  43 #define RETURN_IF_SUPPORTED(f) do {             \
  44    if (ctx->TextureFormatSupported[f])          \
  45       return f;                                 \
  46 } while (0)
  47
  48 /**
  49  * Choose an appropriate texture format given the format, type and
  50  * internalFormat parameters passed to glTexImage().
  51  *
  52  * \param ctx  the GL context.
  53  * \param internalFormat  user's prefered internal texture format.
  54  * \param format  incoming image pixel format.
  55  * \param type  incoming image data type.
  56  *
  57  * \return a pointer to a gl_texture_format object which describes the
  58  * choosen texture format, or NULL on failure.
  59  *
  60  * This is called via dd_function_table::ChooseTextureFormat.  Hardware drivers
  61  * will typically override this function with a specialized version.
  62  */
  63 gl_format
  64 _mesa_choose_tex_format(struct gl_context *ctx, GLenum target,
  65                         GLint internalFormat, GLenum format, GLenum type)
  66 {
  67    (void) format;
  68    (void) type;
  69
  70    switch (internalFormat) {
  71       /* shallow RGBA formats */
  72       case 4:
  73       case GL_RGBA:
  74          if (type == GL_UNSIGNED_SHORT_4_4_4_4_REV) {
  75             RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);
  76          } else if (type == GL_UNSIGNED_SHORT_1_5_5_5_REV) {
  77             RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB1555);
  78          }
  79          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
  80          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
  81          break;
  82
  83       case GL_RGBA8:
  84          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
  85          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
  86          break;
  87       case GL_RGB5_A1:
  88          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB1555);
  89          break;
  90       case GL_RGBA2:
  91          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444_REV); /* just to test another format*/
  92          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);
  93          break;
  94       case GL_RGBA4:
  95          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);
  96          break;
  97
  98       /* deep RGBA formats */
  99       case GL_RGB10_A2:
 100          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB2101010);
 101          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 102          break;
 103       case GL_RGBA12:
 104       case GL_RGBA16:
 105          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);
 106          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);
 107          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
 108          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 109          break;
 110
 111       /* shallow RGB formats */
 112       case 3:
 113       case GL_RGB:
 114       case GL_RGB8:
 115          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
 116          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 117          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 118          break;
 119       case GL_R3_G3_B2:
 120          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB332);
 121          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);
 122          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565_REV);
 123          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
 124          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 125          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 126          break;
 127       case GL_RGB4:
 128          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565_REV); /* just to test another format */
 129          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);
 130          break;
 131       case GL_RGB5:
 132          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);
 133          break;
 134
 135       /* deep RGB formats */
 136       case GL_RGB10:
 137       case GL_RGB12:
 138       case GL_RGB16:
 139          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);
 140          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 141          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 142          break;
 143
 144       /* Alpha formats */
 145       case GL_ALPHA:
 146       case GL_ALPHA4:
 147       case GL_ALPHA8:
 148          RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
 149          break;
 150
 151       case GL_ALPHA12:
 152       case GL_ALPHA16:
 153          RETURN_IF_SUPPORTED(MESA_FORMAT_A16);
 154          RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
 155          break;
 156
 157       /* Luminance formats */
 158       case 1:
 159       case GL_LUMINANCE:
 160       case GL_LUMINANCE4:
 161       case GL_LUMINANCE8:
 162          RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
 163          break;
 164
 165       case GL_LUMINANCE12:
 166       case GL_LUMINANCE16:
 167          RETURN_IF_SUPPORTED(MESA_FORMAT_L16);
 168          RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
 169          break;
 170
 171       /* Luminance/Alpha formats */
 172       case GL_LUMINANCE4_ALPHA4:
 173          RETURN_IF_SUPPORTED(MESA_FORMAT_AL44);
 174          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 175          break;
 176
 177       case 2:
 178       case GL_LUMINANCE_ALPHA:
 179       case GL_LUMINANCE6_ALPHA2:
 180       case GL_LUMINANCE8_ALPHA8:
 181          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 182          break;
 183
 184       case GL_LUMINANCE12_ALPHA4:
 185       case GL_LUMINANCE12_ALPHA12:
 186       case GL_LUMINANCE16_ALPHA16:
 187          RETURN_IF_SUPPORTED(MESA_FORMAT_AL1616);
 188          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 189          break;
 190
 191       case GL_INTENSITY:
 192       case GL_INTENSITY4:
 193       case GL_INTENSITY8:
 194          RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
 195          break;
 196
 197       case GL_INTENSITY12:
 198       case GL_INTENSITY16:
 199          RETURN_IF_SUPPORTED(MESA_FORMAT_I16);
 200          RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
 201          break;
 202
 203       default:
 204          ; /* fallthrough */
 205    }
 206
 207    if (ctx->Extensions.ARB_depth_texture) {
 208       switch (internalFormat) {
 209          case GL_DEPTH_COMPONENT:
 210          case GL_DEPTH_COMPONENT24:
 211          case GL_DEPTH_COMPONENT32:
 212             RETURN_IF_SUPPORTED(MESA_FORMAT_Z32);
 213             RETURN_IF_SUPPORTED(MESA_FORMAT_X8_Z24);
 214             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 215             break;
 216          case GL_DEPTH_COMPONENT16:
 217             RETURN_IF_SUPPORTED(MESA_FORMAT_Z16);
 218             RETURN_IF_SUPPORTED(MESA_FORMAT_X8_Z24);
 219             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 220          default:
 221             ; /* fallthrough */
 222       }
 223    }
 224
 225    switch (internalFormat) {
 226       case GL_COMPRESSED_ALPHA_ARB:
 227          RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
 228          break;
 229       case GL_COMPRESSED_LUMINANCE_ARB:
 230          RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
 231          break;
 232       case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
 233          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 234          break;
 235       case GL_COMPRESSED_INTENSITY_ARB:
 236          RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
 237          break;
 238       case GL_COMPRESSED_RGB_ARB:
 239          /* We don't use texture compression for 1D and 1D array textures.
 240           * For 1D textures, compressions doesn't buy us much.
 241           * For 1D ARRAY textures, there's complicated issues with updating
 242           * sub-regions on non-block boundaries with glCopyTexSubImage, among
 243           * other issues.  FWIW, the GL_EXT_texture_array extension prohibits
 244           * 1D ARRAY textures in S3TC format.
 245           */
 246          if (target != GL_TEXTURE_1D && target != GL_TEXTURE_1D_ARRAY) {
 247             if (ctx->Extensions.EXT_texture_compression_s3tc ||
 248                 ctx->Extensions.S3_s3tc)
 249                RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 250             if (ctx->Extensions.TDFX_texture_compression_FXT1)
 251                RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);
 252          }
 253          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
 254          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 255          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 256          break;
 257       case GL_COMPRESSED_RGBA_ARB:
 258          /* We don't use texture compression for 1D and 1D array textures. */
 259          if (target != GL_TEXTURE_1D && target != GL_TEXTURE_1D_ARRAY) {
 260             if (ctx->Extensions.EXT_texture_compression_s3tc ||
 261                 ctx->Extensions.S3_s3tc)
 262                RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3); /* Not rgba_dxt1, see spec */
 263             if (ctx->Extensions.TDFX_texture_compression_FXT1)
 264                RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);
 265          }
 266          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
 267          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 268          break;
 269       default:
 270          ; /* fallthrough */
 271    }
 272
 273    if (ctx->Extensions.ARB_ES2_compatibility) {
 274       switch (internalFormat) {
 275          case GL_RGB565:
 276             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);
 277             break;
 278          default:
 279          ; /* fallthrough */
 280       }
 281    }
 282
 283    if (ctx->Extensions.MESA_ycbcr_texture) {
 284       if (internalFormat == GL_YCBCR_MESA) {
 285          if (type == GL_UNSIGNED_SHORT_8_8_MESA)
 286             RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR);
 287          else
 288             RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR_REV);
 289       }
 290    }
 291
 292 #if FEATURE_texture_fxt1
 293    if (ctx->Extensions.TDFX_texture_compression_FXT1) {
 294       switch (internalFormat) {
 295          case GL_COMPRESSED_RGB_FXT1_3DFX:
 296             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);
 297          break;
 298          case GL_COMPRESSED_RGBA_FXT1_3DFX:
 299             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);
 300          break;
 301          default:
 302             ; /* fallthrough */
 303       }
 304    }
 305 #endif
 306
 307 #if FEATURE_texture_s3tc
 308    if (ctx->Extensions.EXT_texture_compression_s3tc) {
 309       switch (internalFormat) {
 310          case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 311             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 312             break;
 313          case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 314             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT1);
 315             break;
 316          case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 317             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);
 318             break;
 319          case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 320             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT5);
 321             break;
 322          default:
 323             ; /* fallthrough */
 324       }
 325    }
 326
 327    if (ctx->Extensions.S3_s3tc) {
 328       switch (internalFormat) {
 329          case GL_RGB_S3TC:
 330          case GL_RGB4_S3TC:
 331             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 332             break;
 333          case GL_RGBA_S3TC:
 334          case GL_RGBA4_S3TC:
 335             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);
 336             break;
 337          default:
 338             ; /* fallthrough */
 339       }
 340    }
 341 #endif
 342
 343    if (ctx->Extensions.ARB_texture_float) {
 344       switch (internalFormat) {
 345          case GL_ALPHA16F_ARB:
 346             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT16);
 347             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
 348             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 349             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 350             break;
 351          case GL_ALPHA32F_ARB:
 352             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
 353             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 354             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT16);
 355             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 356             break;
 357          case GL_LUMINANCE16F_ARB:
 358             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT16);
 359             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
 360             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 361             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 362             break;
 363          case GL_LUMINANCE32F_ARB:
 364             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
 365             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 366             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT16);
 367             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 368             break;
 369          case GL_LUMINANCE_ALPHA16F_ARB:
 370             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16);
 371             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
 372             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 373             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 374             break;
 375          case GL_LUMINANCE_ALPHA32F_ARB:
 376             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
 377             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 378             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16);
 379             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 380             break;
 381          case GL_INTENSITY16F_ARB:
 382             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT16);
 383             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
 384             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 385             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 386             break;
 387          case GL_INTENSITY32F_ARB:
 388             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
 389             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 390             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT16);
 391             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 392             break;
 393          case GL_RGB16F_ARB:
 394             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT16);
 395             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 396             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
 397             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 398             break;
 399          case GL_RGB32F_ARB:
 400             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
 401             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 402             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT16);
 403             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 404             break;
 405          case GL_RGBA16F_ARB:
 406             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 407             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 408             break;
 409          case GL_RGBA32F_ARB:
 410             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 411             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 412             break;
 413          default:
 414             ; /* fallthrough */
 415       }
 416    }
 417
 418    if (ctx->Extensions.EXT_texture_shared_exponent) {
 419       switch (internalFormat) {
 420          case GL_RGB9_E5:
 421             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_RGB9_E5_FLOAT]);
 422             return MESA_FORMAT_RGB9_E5_FLOAT;
 423          default:
 424             ; /* fallthrough */
 425       }
 426    }
 427
 428    if (ctx->Extensions.EXT_packed_float) {
 429       switch (internalFormat) {
 430          case GL_R11F_G11F_B10F:
 431             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_R11_G11_B10_FLOAT]);
 432             return MESA_FORMAT_R11_G11_B10_FLOAT;
 433          default:
 434             ; /* fallthrough */
 435       }
 436    }
 437
 438    if (ctx->Extensions.EXT_packed_depth_stencil) {
 439       switch (internalFormat) {
 440          case GL_DEPTH_STENCIL_EXT:
 441          case GL_DEPTH24_STENCIL8_EXT:
 442             RETURN_IF_SUPPORTED(MESA_FORMAT_Z24_S8);
 443             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 444             break;
 445          default:
 446             ; /* fallthrough */
 447       }
 448    }
 449
 450    if (ctx->Extensions.ARB_depth_buffer_float) {
 451       switch (internalFormat) {
 452          case GL_DEPTH_COMPONENT32F:
 453             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_Z32_FLOAT]);
 454             return MESA_FORMAT_Z32_FLOAT;
 455          case GL_DEPTH32F_STENCIL8:
 456             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_Z32_FLOAT_X24S8]);
 457             return MESA_FORMAT_Z32_FLOAT_X24S8;
 458          default:
 459             ; /* fallthrough */
 460       }
 461    }
 462
 463    if (ctx->Extensions.ATI_envmap_bumpmap) {
 464       switch (internalFormat) {
 465          case GL_DUDV_ATI:
 466          case GL_DU8DV8_ATI:
 467             RETURN_IF_SUPPORTED(MESA_FORMAT_DUDV8);
 468             break;
 469          default:
 470             ; /* fallthrough */
 471       }
 472    }
 473
 474    if (ctx->Extensions.EXT_texture_snorm) {
 475       switch (internalFormat) {
 476          case GL_RED_SNORM:
 477          case GL_R8_SNORM:
 478             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R8);
 479             break;
 480          case GL_RG_SNORM:
 481          case GL_RG8_SNORM:
 482             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG88_REV);
 483             break;
 484          case GL_RGB_SNORM:
 485          case GL_RGB8_SNORM:
 486             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 487             /* FALLTHROUGH */
 488          case GL_RGBA_SNORM:
 489          case GL_RGBA8_SNORM:
 490             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 491             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 492             break;
 493          case GL_ALPHA_SNORM:
 494          case GL_ALPHA8_SNORM:
 495             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A8);
 496             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 497             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 498             break;
 499          case GL_LUMINANCE_SNORM:
 500          case GL_LUMINANCE8_SNORM:
 501             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L8);
 502             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 503             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 504             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 505             break;
 506          case GL_LUMINANCE_ALPHA_SNORM:
 507          case GL_LUMINANCE8_ALPHA8_SNORM:
 508             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL88);
 509             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 510             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 511             break;
 512          case GL_INTENSITY_SNORM:
 513          case GL_INTENSITY8_SNORM:
 514             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I8);
 515             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 516             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 517             break;
 518          case GL_R16_SNORM:
 519             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R16);
 520             break;
 521          case GL_RG16_SNORM:
 522             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_GR1616);
 523             break;
 524          case GL_RGB16_SNORM:
 525             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGB_16);
 526             /* FALLTHROUGH */
 527          case GL_RGBA16_SNORM:
 528             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 529             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 530             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 531             break;
 532          case GL_ALPHA16_SNORM:
 533             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A16);
 534             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 535             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 536             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 537             break;
 538          case GL_LUMINANCE16_SNORM:
 539             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L16);
 540             /* FALLTHROUGH */
 541          case GL_LUMINANCE16_ALPHA16_SNORM:
 542             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL1616);
 543             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 544             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 545             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 546             break;
 547          case GL_INTENSITY16_SNORM:
 548             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I16);
 549             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 550             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 551             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 552             break;
 553          default:
 554             ; /* fall-through */
 555       }
 556    }
 557
 558 #if FEATURE_EXT_texture_sRGB
 559    if (ctx->Extensions.EXT_texture_sRGB) {
 560       switch (internalFormat) {
 561          case GL_SRGB_EXT:
 562          case GL_SRGB8_EXT:
 563             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 564             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 565             break;
 566          case GL_SRGB_ALPHA_EXT:
 567          case GL_SRGB8_ALPHA8_EXT:
 568             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 569             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 570             break;
 571          case GL_SLUMINANCE_EXT:
 572          case GL_SLUMINANCE8_EXT:
 573             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 574             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 575             break;
 576          case GL_SLUMINANCE_ALPHA_EXT:
 577          case GL_SLUMINANCE8_ALPHA8_EXT:
 578             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 579             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 580             break;
 581          case GL_COMPRESSED_SLUMINANCE_EXT:
 582             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 583             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 584             break;
 585          case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 586             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 587             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 588             break;
 589          case GL_COMPRESSED_SRGB_EXT:
 590 #if FEATURE_texture_s3tc
 591             if (ctx->Extensions.EXT_texture_compression_s3tc)
 592                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
 593 #endif
 594             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 595             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 596             break;
 597          case GL_COMPRESSED_SRGB_ALPHA_EXT:
 598 #if FEATURE_texture_s3tc
 599             if (ctx->Extensions.EXT_texture_compression_s3tc)
 600                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3); /* Not srgba_dxt1, see spec */
 601 #endif
 602             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 603             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 604             break;
 605 #if FEATURE_texture_s3tc
 606          case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 607             if (ctx->Extensions.EXT_texture_compression_s3tc)
 608                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
 609             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 610             break;
 611          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 612             if (ctx->Extensions.EXT_texture_compression_s3tc)
 613                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT1);
 614             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 615             break;
 616          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 617             if (ctx->Extensions.EXT_texture_compression_s3tc)
 618                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3);
 619             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 620             break;
 621          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 622             if (ctx->Extensions.EXT_texture_compression_s3tc)
 623                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT5);
 624             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 625             break;
 626 #endif
 627          default:
 628             ; /* fallthrough */
 629       }
 630    }
 631 #endif /* FEATURE_EXT_texture_sRGB */
 632
 633    if (ctx->Extensions.EXT_texture_integer) {
 634       switch (internalFormat) {
 635       case GL_ALPHA8UI_EXT:
 636          RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_UINT8);
 637          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 638          break;
 639       case GL_ALPHA16UI_EXT:
 640          RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_UINT16);
 641          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 642          break;
 643       case GL_ALPHA32UI_EXT:
 644          RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_UINT32);
 645          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 646          break;
 647       case GL_ALPHA8I_EXT:
 648          RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_INT8);
 649          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 650          break;
 651       case GL_ALPHA16I_EXT:
 652          RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_INT16);
 653          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 654          break;
 655       case GL_ALPHA32I_EXT:
 656          RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_INT32);
 657          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 658          break;
 659       case GL_LUMINANCE8UI_EXT:
 660          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_UINT8);
 661          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 662          break;
 663       case GL_LUMINANCE16UI_EXT:
 664          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_UINT16);
 665          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 666          break;
 667       case GL_LUMINANCE32UI_EXT:
 668          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_UINT32);
 669          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 670          break;
 671       case GL_LUMINANCE8I_EXT:
 672          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_INT8);
 673          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 674          break;
 675       case GL_LUMINANCE16I_EXT:
 676          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_INT16);
 677          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 678          break;
 679       case GL_LUMINANCE32I_EXT:
 680          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_INT32);
 681          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 682          break;
 683       case GL_LUMINANCE_ALPHA8UI_EXT:
 684          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_UINT8);
 685          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 686          break;
 687       case GL_LUMINANCE_ALPHA16UI_EXT:
 688          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_UINT16);
 689          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 690          break;
 691       case GL_LUMINANCE_ALPHA32UI_EXT:
 692          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_UINT32);
 693          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 694          break;
 695       case GL_LUMINANCE_ALPHA8I_EXT:
 696          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_INT8);
 697          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 698          break;
 699       case GL_LUMINANCE_ALPHA16I_EXT:
 700          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_INT16);
 701          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 702          break;
 703       case GL_LUMINANCE_ALPHA32I_EXT:
 704          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_INT32);
 705          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 706          break;
 707       case GL_INTENSITY8UI_EXT:
 708          RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_UINT8);
 709          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 710          break;
 711       case GL_INTENSITY16UI_EXT:
 712          RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_UINT16);
 713          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 714          break;
 715       case GL_INTENSITY32UI_EXT:
 716          RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_UINT32);
 717          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 718          break;
 719       case GL_INTENSITY8I_EXT:
 720          RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_INT8);
 721          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 722          break;
 723       case GL_INTENSITY16I_EXT:
 724          RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_INT16);
 725          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 726          break;
 727       case GL_INTENSITY32I_EXT:
 728          RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_INT32);
 729          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 730          break;
 731       }
 732    }
 733
 734    if (ctx->Version >= 30 ||
 735        ctx->Extensions.EXT_texture_integer) {
 736       switch (internalFormat) {
 737       case GL_RGB8UI_EXT:
 738          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_UINT8);
 739          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 740          break;
 741       case GL_RGB16UI_EXT:
 742          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_UINT16);
 743          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 744          break;
 745       case GL_RGB32UI_EXT:
 746          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_UINT32);
 747          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 748          break;
 749       case GL_RGB8I_EXT:
 750          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_INT8);
 751          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 752          break;
 753       case GL_RGB16I_EXT:
 754          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_INT16);
 755          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 756          break;
 757       case GL_RGB32I_EXT:
 758          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_INT32);
 759          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 760          break;
 761       case GL_RGBA8UI_EXT:
 762          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 763          break;
 764       case GL_RGBA16UI_EXT:
 765          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 766          break;
 767       case GL_RGBA32UI_EXT:
 768          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 769          break;
 770       case GL_RGBA8I_EXT:
 771          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 772          break;
 773       case GL_RGBA16I_EXT:
 774          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 775          break;
 776       case GL_RGBA32I_EXT:
 777          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 778          break;
 779       }
 780    }
 781
 782    if (ctx->Extensions.ARB_texture_rg) {
 783       switch (internalFormat) {
 784       case GL_R8:
 785       case GL_RED:
 786          RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
 787          break;
 788
 789       case GL_COMPRESSED_RED:
 790          if (target != GL_TEXTURE_1D && target != GL_TEXTURE_1D_ARRAY)
 791             RETURN_IF_SUPPORTED(MESA_FORMAT_RED_RGTC1);
 792          RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
 793          break;
 794
 795       case GL_R16:
 796          RETURN_IF_SUPPORTED(MESA_FORMAT_R16);
 797          break;
 798
 799       case GL_RG:
 800       case GL_RG8:
 801          RETURN_IF_SUPPORTED(MESA_FORMAT_GR88);
 802          break;
 803
 804       case GL_COMPRESSED_RG:
 805          if (target != GL_TEXTURE_1D && target != GL_TEXTURE_1D_ARRAY)
 806             RETURN_IF_SUPPORTED(MESA_FORMAT_RG_RGTC2);
 807          RETURN_IF_SUPPORTED(MESA_FORMAT_GR88);
 808          break;
 809
 810       case GL_RG16:
 811          RETURN_IF_SUPPORTED(MESA_FORMAT_RG1616);
 812          break;
 813
 814       default:
 815          ; /* fallthrough */
 816       }
 817    }
 818
 819    if (ctx->Extensions.ARB_texture_rg && ctx->Extensions.ARB_texture_float) {
 820       switch (internalFormat) {
 821       case GL_R16F:
 822          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT16);
 823          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT16);
 824          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT32);
 825          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 826          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 827          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 828          break;
 829       case GL_R32F:
 830          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT32);
 831          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 832          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 833          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT16);
 834          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT16);
 835          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 836          break;
 837       case GL_RG16F:
 838          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT16);
 839          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 840          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 841          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 842          break;
 843       case GL_RG32F:
 844          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 845          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 846          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT16);
 847          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 848          break;
 849
 850       default:
 851          ; /* fallthrough */
 852       }
 853    }
 854
 855    if (ctx->Version >= 30 ||
 856        (ctx->Extensions.ARB_texture_rg &&
 857         ctx->Extensions.EXT_texture_integer)) {
 858       switch (internalFormat) {
 859       case GL_R8UI:
 860          RETURN_IF_SUPPORTED(MESA_FORMAT_R_UINT8);
 861          break;
 862       case GL_RG8UI:
 863          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_UINT8);
 864          break;
 865       case GL_R16UI:
 866          RETURN_IF_SUPPORTED(MESA_FORMAT_R_UINT16);
 867          break;
 868       case GL_RG16UI:
 869          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_UINT16);
 870          break;
 871       case GL_R32UI:
 872          RETURN_IF_SUPPORTED(MESA_FORMAT_R_UINT32);
 873          break;
 874       case GL_RG32UI:
 875          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_UINT32);
 876          break;
 877       case GL_R8I:
 878          RETURN_IF_SUPPORTED(MESA_FORMAT_R_INT8);
 879          break;
 880       case GL_RG8I:
 881          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_INT8);
 882          break;
 883       case GL_R16I:
 884          RETURN_IF_SUPPORTED(MESA_FORMAT_R_INT16);
 885          break;
 886       case GL_RG16I:
 887          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_INT16);
 888          break;
 889       case GL_R32I:
 890          RETURN_IF_SUPPORTED(MESA_FORMAT_R_INT32);
 891          break;
 892       case GL_RG32I:
 893          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_INT32);
 894          break;
 895       default:
 896          break;
 897       }
 898    }
 899
 900    if (ctx->Extensions.ARB_texture_rgb10_a2ui) {
 901       switch (internalFormat) {
 902       case GL_RGB10_A2UI:
 903          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB2101010_UINT);
 904          RETURN_IF_SUPPORTED(MESA_FORMAT_ABGR2101010_UINT);
 905          break;
 906       default:
 907          break;
 908       }
 909    }
 910    /* GL_BGRA can be an internal format *only* in OpenGL ES (1.x or 2.0).
 911     */
 912    if (_mesa_is_gles(ctx)) {
 913       switch (internalFormat) {
 914       case GL_BGRA:
 915          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 916          break;
 917
 918       default:
 919          ; /* fallthrough */
 920       }
 921    }
 922
 923    if (ctx->Extensions.ARB_texture_compression_rgtc) {
 924       switch (internalFormat) {
 925          case GL_COMPRESSED_RED_RGTC1:
 926             RETURN_IF_SUPPORTED(MESA_FORMAT_RED_RGTC1);
 927             break;
 928          case GL_COMPRESSED_SIGNED_RED_RGTC1:
 929             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RED_RGTC1);
 930             break;
 931          case GL_COMPRESSED_RG_RGTC2:
 932             RETURN_IF_SUPPORTED(MESA_FORMAT_RG_RGTC2);
 933             break;
 934          case GL_COMPRESSED_SIGNED_RG_RGTC2:
 935             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG_RGTC2);
 936             break;
 937          default:
 938             ; /* fallthrough */
 939       }
 940    }
 941
 942    if (ctx->Extensions.EXT_texture_compression_latc) {
 943       switch (internalFormat) {
 944          case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
 945             RETURN_IF_SUPPORTED(MESA_FORMAT_L_LATC1);
 946             break;
 947          case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
 948             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L_LATC1);
 949             break;
 950          case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
 951             RETURN_IF_SUPPORTED(MESA_FORMAT_LA_LATC2);
 952             break;
 953          case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
 954             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_LA_LATC2);
 955             break;
 956          default:
 957             ; /* fallthrough */
 958       }
 959    }
 960
 961    if (ctx->Extensions.ATI_texture_compression_3dc) {
 962       switch (internalFormat) {
 963          case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
 964             RETURN_IF_SUPPORTED(MESA_FORMAT_LA_LATC2);
 965             break;
 966          default:
 967             ; /* fallthrough */
 968       }
 969    }
 970
 971    if (ctx->Extensions.OES_compressed_ETC1_RGB8_texture) {
 972       switch (internalFormat) {
 973          case GL_ETC1_RGB8_OES:
 974             RETURN_IF_SUPPORTED(MESA_FORMAT_ETC1_RGB8);
 975             break;
 976          default:
 977             ; /* fallthrough */
 978       }
 979    }
 980
 981    _mesa_problem(ctx, "unexpected format %s in _mesa_choose_tex_format()",
 982                  _mesa_lookup_enum_by_nr(internalFormat));
 983    return MESA_FORMAT_NONE;
 984 }
 985