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 "mfeatures.h"
  38 #include "mtypes.h"
  39 #include "texcompress.h"
  40 #include "texformat.h"
  41
  42 #define RETURN_IF_SUPPORTED(f) do {             \
  43    if (ctx->TextureFormatSupported[f])          \
  44       return f;                                 \
  45 } while (0)
  46
  47 /**
  48  * Choose an appropriate texture format given the format, type and
  49  * internalFormat parameters passed to glTexImage().
  50  *
  51  * \param ctx  the GL context.
  52  * \param internalFormat  user's prefered internal texture format.
  53  * \param format  incoming image pixel format.
  54  * \param type  incoming image data type.
  55  *
  56  * \return a pointer to a gl_texture_format object which describes the
  57  * choosen texture format, or NULL on failure.
  58  *
  59  * This is called via dd_function_table::ChooseTextureFormat.  Hardware drivers
  60  * will typically override this function with a specialized version.
  61  */
  62 gl_format
  63 _mesa_choose_tex_format( struct gl_context *ctx, GLint internalFormat,
  64                          GLenum format, GLenum type )
  65 {
  66    (void) format;
  67    (void) type;
  68
  69    switch (internalFormat) {
  70       /* shallow RGBA formats */
  71       case 4:
  72       case GL_RGBA:
  73          if (type == GL_UNSIGNED_SHORT_4_4_4_4_REV) {
  74             RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);
  75          } else if (type == GL_UNSIGNED_SHORT_1_5_5_5_REV) {
  76             RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB1555);
  77          }
  78          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
  79          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
  80          break;
  81
  82       case GL_RGBA8:
  83          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
  84          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
  85          break;
  86       case GL_RGB5_A1:
  87          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB1555);
  88          break;
  89       case GL_RGBA2:
  90          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444_REV); /* just to test another format*/
  91          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);
  92          break;
  93       case GL_RGBA4:
  94          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);
  95          break;
  96
  97       /* deep RGBA formats */
  98       case GL_RGB10_A2:
  99          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB2101010);
 100          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 101          break;
 102       case GL_RGBA12:
 103       case GL_RGBA16:
 104          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);
 105          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);
 106          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
 107          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 108          break;
 109
 110       /* shallow RGB formats */
 111       case 3:
 112       case GL_RGB:
 113       case GL_RGB8:
 114          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
 115          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 116          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 117          break;
 118       case GL_R3_G3_B2:
 119          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB332);
 120          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
 121          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 122          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 123          break;
 124       case GL_RGB4:
 125          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565_REV); /* just to test another format */
 126          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);
 127          break;
 128       case GL_RGB5:
 129          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);
 130          break;
 131
 132       /* deep RGB formats */
 133       case GL_RGB10:
 134       case GL_RGB12:
 135       case GL_RGB16:
 136          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);
 137          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 138          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 139          break;
 140
 141       /* Alpha formats */
 142       case GL_ALPHA:
 143       case GL_ALPHA4:
 144       case GL_ALPHA8:
 145          RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
 146          break;
 147
 148       case GL_ALPHA12:
 149       case GL_ALPHA16:
 150          RETURN_IF_SUPPORTED(MESA_FORMAT_A16);
 151          RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
 152          break;
 153
 154       /* Luminance formats */
 155       case 1:
 156       case GL_LUMINANCE:
 157       case GL_LUMINANCE4:
 158       case GL_LUMINANCE8:
 159          RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
 160          break;
 161
 162       case GL_LUMINANCE12:
 163       case GL_LUMINANCE16:
 164          RETURN_IF_SUPPORTED(MESA_FORMAT_L16);
 165          RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
 166          break;
 167
 168       /* Luminance/Alpha formats */
 169       case GL_LUMINANCE4_ALPHA4:
 170          RETURN_IF_SUPPORTED(MESA_FORMAT_AL44);
 171          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 172          break;
 173
 174       case 2:
 175       case GL_LUMINANCE_ALPHA:
 176       case GL_LUMINANCE6_ALPHA2:
 177       case GL_LUMINANCE8_ALPHA8:
 178          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 179          break;
 180
 181       case GL_LUMINANCE12_ALPHA4:
 182       case GL_LUMINANCE12_ALPHA12:
 183       case GL_LUMINANCE16_ALPHA16:
 184          RETURN_IF_SUPPORTED(MESA_FORMAT_AL1616);
 185          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 186          break;
 187
 188       case GL_INTENSITY:
 189       case GL_INTENSITY4:
 190       case GL_INTENSITY8:
 191          RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
 192          break;
 193
 194       case GL_INTENSITY12:
 195       case GL_INTENSITY16:
 196          RETURN_IF_SUPPORTED(MESA_FORMAT_I16);
 197          RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
 198          break;
 199
 200       case GL_COLOR_INDEX:
 201       case GL_COLOR_INDEX1_EXT:
 202       case GL_COLOR_INDEX2_EXT:
 203       case GL_COLOR_INDEX4_EXT:
 204       case GL_COLOR_INDEX12_EXT:
 205       case GL_COLOR_INDEX16_EXT:
 206       case GL_COLOR_INDEX8_EXT:
 207          RETURN_IF_SUPPORTED(MESA_FORMAT_CI8);
 208          break;
 209
 210       default:
 211          ; /* fallthrough */
 212    }
 213
 214    if (ctx->Extensions.ARB_depth_texture) {
 215       switch (internalFormat) {
 216          case GL_DEPTH_COMPONENT:
 217          case GL_DEPTH_COMPONENT24:
 218          case GL_DEPTH_COMPONENT32:
 219             RETURN_IF_SUPPORTED(MESA_FORMAT_Z32);
 220             RETURN_IF_SUPPORTED(MESA_FORMAT_X8_Z24);
 221             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 222             break;
 223          case GL_DEPTH_COMPONENT16:
 224             RETURN_IF_SUPPORTED(MESA_FORMAT_Z16);
 225             RETURN_IF_SUPPORTED(MESA_FORMAT_X8_Z24);
 226             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 227          default:
 228             ; /* fallthrough */
 229       }
 230    }
 231
 232    switch (internalFormat) {
 233       case GL_COMPRESSED_ALPHA_ARB:
 234          RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
 235          break;
 236       case GL_COMPRESSED_LUMINANCE_ARB:
 237          RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
 238          break;
 239       case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
 240          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 241          break;
 242       case GL_COMPRESSED_INTENSITY_ARB:
 243          RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
 244          break;
 245       case GL_COMPRESSED_RGB_ARB:
 246          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 247              ctx->Extensions.S3_s3tc)
 248             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 249          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 250             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);
 251          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
 252          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 253          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 254          break;
 255       case GL_COMPRESSED_RGBA_ARB:
 256          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 257              ctx->Extensions.S3_s3tc)
 258             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3); /* Not rgba_dxt1, see spec */
 259          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 260             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);
 261          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
 262          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 263          break;
 264       default:
 265          ; /* fallthrough */
 266    }
 267
 268    if (ctx->Extensions.MESA_ycbcr_texture) {
 269       if (internalFormat == GL_YCBCR_MESA) {
 270          if (type == GL_UNSIGNED_SHORT_8_8_MESA)
 271             RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR);
 272          else
 273             RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR_REV);
 274       }
 275    }
 276
 277 #if FEATURE_texture_fxt1
 278    if (ctx->Extensions.TDFX_texture_compression_FXT1) {
 279       switch (internalFormat) {
 280          case GL_COMPRESSED_RGB_FXT1_3DFX:
 281             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);
 282          break;
 283          case GL_COMPRESSED_RGBA_FXT1_3DFX:
 284             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);
 285          break;
 286          default:
 287             ; /* fallthrough */
 288       }
 289    }
 290 #endif
 291
 292 #if FEATURE_texture_s3tc
 293    if (ctx->Extensions.EXT_texture_compression_s3tc) {
 294       switch (internalFormat) {
 295          case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 296             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 297             break;
 298          case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 299             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT1);
 300             break;
 301          case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 302             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);
 303             break;
 304          case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 305             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT5);
 306             break;
 307          default:
 308             ; /* fallthrough */
 309       }
 310    }
 311
 312    if (ctx->Extensions.S3_s3tc) {
 313       switch (internalFormat) {
 314          case GL_RGB_S3TC:
 315          case GL_RGB4_S3TC:
 316             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 317             break;
 318          case GL_RGBA_S3TC:
 319          case GL_RGBA4_S3TC:
 320             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);
 321             break;
 322          default:
 323             ; /* fallthrough */
 324       }
 325    }
 326 #endif
 327
 328    if (ctx->Extensions.ARB_texture_float) {
 329       switch (internalFormat) {
 330          case GL_ALPHA16F_ARB:
 331             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT16);
 332             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
 333             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 334             break;
 335          case GL_ALPHA32F_ARB:
 336             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
 337             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 338             break;
 339          case GL_LUMINANCE16F_ARB:
 340             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT16);
 341             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
 342             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 343             break;
 344          case GL_LUMINANCE32F_ARB:
 345             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
 346             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 347             break;
 348          case GL_LUMINANCE_ALPHA16F_ARB:
 349             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16);
 350             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
 351             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 352             break;
 353          case GL_LUMINANCE_ALPHA32F_ARB:
 354             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
 355             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 356             break;
 357          case GL_INTENSITY16F_ARB:
 358             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT16);
 359             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
 360             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 361             break;
 362          case GL_INTENSITY32F_ARB:
 363             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
 364             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 365             break;
 366          case GL_RGB16F_ARB:
 367             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT16);
 368             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
 369             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 370             break;
 371          case GL_RGB32F_ARB:
 372             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
 373             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 374             break;
 375          case GL_RGBA16F_ARB:
 376             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 377             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 378             break;
 379          case GL_RGBA32F_ARB:
 380             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 381             break;
 382          default:
 383             ; /* fallthrough */
 384       }
 385    }
 386
 387    if (ctx->Extensions.EXT_texture_shared_exponent) {
 388       switch (internalFormat) {
 389          case GL_RGB9_E5:
 390             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_RGB9_E5_FLOAT]);
 391             return MESA_FORMAT_RGB9_E5_FLOAT;
 392          default:
 393             ; /* fallthrough */
 394       }
 395    }
 396
 397    if (ctx->Extensions.EXT_packed_float) {
 398       switch (internalFormat) {
 399          case GL_R11F_G11F_B10F:
 400             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_R11_G11_B10_FLOAT]);
 401             return MESA_FORMAT_R11_G11_B10_FLOAT;
 402          default:
 403             ; /* fallthrough */
 404       }
 405    }
 406
 407    if (ctx->Extensions.EXT_packed_depth_stencil) {
 408       switch (internalFormat) {
 409          case GL_DEPTH_STENCIL_EXT:
 410          case GL_DEPTH24_STENCIL8_EXT:
 411             RETURN_IF_SUPPORTED(MESA_FORMAT_Z24_S8);
 412             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 413             break;
 414          default:
 415             ; /* fallthrough */
 416       }
 417    }
 418
 419    if (ctx->Extensions.ARB_depth_buffer_float) {
 420       switch (internalFormat) {
 421          case GL_DEPTH_COMPONENT32F:
 422             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_Z32_FLOAT]);
 423             return MESA_FORMAT_Z32_FLOAT;
 424          case GL_DEPTH32F_STENCIL8:
 425             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_Z32_FLOAT_X24S8]);
 426             return MESA_FORMAT_Z32_FLOAT_X24S8;
 427          default:
 428             ; /* fallthrough */
 429       }
 430    }
 431
 432    if (ctx->Extensions.ATI_envmap_bumpmap) {
 433       switch (internalFormat) {
 434          case GL_DUDV_ATI:
 435          case GL_DU8DV8_ATI:
 436             RETURN_IF_SUPPORTED(MESA_FORMAT_DUDV8);
 437             break;
 438          default:
 439             ; /* fallthrough */
 440       }
 441    }
 442
 443    if (ctx->Extensions.EXT_texture_snorm) {
 444       switch (internalFormat) {
 445          case GL_RED_SNORM:
 446          case GL_R8_SNORM:
 447             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R8);
 448             break;
 449          case GL_RG_SNORM:
 450          case GL_RG8_SNORM:
 451             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG88_REV);
 452             break;
 453          case GL_RGB_SNORM:
 454          case GL_RGB8_SNORM:
 455             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 456             /* FALLTHROUGH */
 457          case GL_RGBA_SNORM:
 458          case GL_RGBA8_SNORM:
 459             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 460             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 461             break;
 462          case GL_ALPHA_SNORM:
 463          case GL_ALPHA8_SNORM:
 464             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A8);
 465             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 466             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 467             break;
 468          case GL_LUMINANCE_SNORM:
 469          case GL_LUMINANCE8_SNORM:
 470             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L8);
 471             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 472             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 473             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 474             break;
 475          case GL_LUMINANCE_ALPHA_SNORM:
 476          case GL_LUMINANCE8_ALPHA8_SNORM:
 477             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL88);
 478             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 479             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 480             break;
 481          case GL_INTENSITY_SNORM:
 482          case GL_INTENSITY8_SNORM:
 483             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I8);
 484             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 485             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 486             break;
 487          case GL_R16_SNORM:
 488             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R16);
 489             break;
 490          case GL_RG16_SNORM:
 491             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_GR1616);
 492             break;
 493          case GL_RGB16_SNORM:
 494             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGB_16);
 495             /* FALLTHROUGH */
 496          case GL_RGBA16_SNORM:
 497             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 498             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 499             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 500             break;
 501          case GL_ALPHA16_SNORM:
 502             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A16);
 503             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 504             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 505             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 506             break;
 507          case GL_LUMINANCE16_SNORM:
 508             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L16);
 509             /* FALLTHROUGH */
 510          case GL_LUMINANCE16_ALPHA16_SNORM:
 511             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL1616);
 512             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 513             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 514             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 515             break;
 516          case GL_INTENSITY16_SNORM:
 517             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I16);
 518             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 519             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 520             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 521             break;
 522          default:
 523             ; /* fall-through */
 524       }
 525    }
 526
 527 #if FEATURE_EXT_texture_sRGB
 528    if (ctx->Extensions.EXT_texture_sRGB) {
 529       switch (internalFormat) {
 530          case GL_SRGB_EXT:
 531          case GL_SRGB8_EXT:
 532             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 533             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 534             break;
 535          case GL_SRGB_ALPHA_EXT:
 536          case GL_SRGB8_ALPHA8_EXT:
 537             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 538             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 539             break;
 540          case GL_SLUMINANCE_EXT:
 541          case GL_SLUMINANCE8_EXT:
 542             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 543             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 544             break;
 545          case GL_SLUMINANCE_ALPHA_EXT:
 546          case GL_SLUMINANCE8_ALPHA8_EXT:
 547             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 548             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 549             break;
 550          case GL_COMPRESSED_SLUMINANCE_EXT:
 551             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 552             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 553             break;
 554          case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 555             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 556             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 557             break;
 558          case GL_COMPRESSED_SRGB_EXT:
 559 #if FEATURE_texture_s3tc
 560             if (ctx->Extensions.EXT_texture_compression_s3tc)
 561                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
 562 #endif
 563             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 564             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 565             break;
 566          case GL_COMPRESSED_SRGB_ALPHA_EXT:
 567 #if FEATURE_texture_s3tc
 568             if (ctx->Extensions.EXT_texture_compression_s3tc)
 569                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3); /* Not srgba_dxt1, see spec */
 570 #endif
 571             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 572             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 573             break;
 574 #if FEATURE_texture_s3tc
 575          case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 576             if (ctx->Extensions.EXT_texture_compression_s3tc)
 577                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
 578             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 579             break;
 580          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 581             if (ctx->Extensions.EXT_texture_compression_s3tc)
 582                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT1);
 583             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 584             break;
 585          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 586             if (ctx->Extensions.EXT_texture_compression_s3tc)
 587                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3);
 588             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 589             break;
 590          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 591             if (ctx->Extensions.EXT_texture_compression_s3tc)
 592                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT5);
 593             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 594             break;
 595 #endif
 596          default:
 597             ; /* fallthrough */
 598       }
 599    }
 600 #endif /* FEATURE_EXT_texture_sRGB */
 601
 602    if (ctx->Extensions.EXT_texture_integer) {
 603       switch (internalFormat) {
 604       case GL_RGBA32UI_EXT:
 605       case GL_RGB32UI_EXT:
 606       case GL_ALPHA32UI_EXT:
 607       case GL_INTENSITY32UI_EXT:
 608       case GL_LUMINANCE32UI_EXT:
 609       case GL_LUMINANCE_ALPHA32UI_EXT:
 610          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 611          break;
 612       case GL_RGBA16UI_EXT:
 613       case GL_RGB16UI_EXT:
 614       case GL_ALPHA16UI_EXT:
 615       case GL_INTENSITY16UI_EXT:
 616       case GL_LUMINANCE16UI_EXT:
 617       case GL_LUMINANCE_ALPHA16UI_EXT:
 618          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 619          break;
 620       case GL_RGBA8UI_EXT:
 621       case GL_RGB8UI_EXT:
 622       case GL_ALPHA8UI_EXT:
 623       case GL_INTENSITY8UI_EXT:
 624       case GL_LUMINANCE8UI_EXT:
 625       case GL_LUMINANCE_ALPHA8UI_EXT:
 626          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 627          break;
 628       case GL_RGBA32I_EXT:
 629       case GL_RGB32I_EXT:
 630       case GL_ALPHA32I_EXT:
 631       case GL_INTENSITY32I_EXT:
 632       case GL_LUMINANCE32I_EXT:
 633       case GL_LUMINANCE_ALPHA32I_EXT:
 634          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 635          break;
 636       case GL_RGBA16I_EXT:
 637       case GL_RGB16I_EXT:
 638       case GL_ALPHA16I_EXT:
 639       case GL_INTENSITY16I_EXT:
 640       case GL_LUMINANCE16I_EXT:
 641       case GL_LUMINANCE_ALPHA16I_EXT:
 642          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 643          break;
 644       case GL_RGBA8I_EXT:
 645       case GL_RGB8I_EXT:
 646       case GL_ALPHA8I_EXT:
 647       case GL_INTENSITY8I_EXT:
 648       case GL_LUMINANCE8I_EXT:
 649       case GL_LUMINANCE_ALPHA8I_EXT:
 650          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 651          break;
 652       }
 653    }
 654
 655    if (ctx->Extensions.ARB_texture_rg) {
 656       switch (internalFormat) {
 657       case GL_R8:
 658       case GL_RED:
 659          RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
 660          break;
 661
 662       case GL_COMPRESSED_RED:
 663          RETURN_IF_SUPPORTED(MESA_FORMAT_RED_RGTC1);
 664          RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
 665          break;
 666
 667       case GL_R16:
 668          RETURN_IF_SUPPORTED(MESA_FORMAT_R16);
 669          break;
 670
 671       case GL_RG:
 672       case GL_RG8:
 673          RETURN_IF_SUPPORTED(MESA_FORMAT_RG88);
 674          break;
 675
 676       case GL_COMPRESSED_RG:
 677          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_RGTC2);
 678          RETURN_IF_SUPPORTED(MESA_FORMAT_RG88);
 679          break;
 680
 681       case GL_RG16:
 682          RETURN_IF_SUPPORTED(MESA_FORMAT_RG1616);
 683          break;
 684
 685       default:
 686          ; /* fallthrough */
 687       }
 688    }
 689
 690    if (ctx->Extensions.ARB_texture_rg && ctx->Extensions.ARB_texture_float) {
 691       switch (internalFormat) {
 692       case GL_R16F:
 693          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT16);
 694          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT32);
 695          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 696          break;
 697       case GL_R32F:
 698          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT32);
 699          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 700          break;
 701       case GL_RG16F:
 702          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT16);
 703          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 704          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 705          break;
 706       case GL_RG32F:
 707          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 708          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 709          break;
 710
 711       default:
 712          ; /* fallthrough */
 713       }
 714    }
 715
 716    if (ctx->Extensions.EXT_texture_format_BGRA8888) {
 717       switch (internalFormat) {
 718       case GL_BGRA:
 719          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 720          break;
 721
 722       default:
 723          ; /* fallthrough */
 724       }
 725    }
 726
 727    if (ctx->Extensions.ARB_texture_compression_rgtc) {
 728       switch (internalFormat) {
 729          case GL_COMPRESSED_RED_RGTC1:
 730             RETURN_IF_SUPPORTED(MESA_FORMAT_RED_RGTC1);
 731             break;
 732          case GL_COMPRESSED_SIGNED_RED_RGTC1:
 733             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RED_RGTC1);
 734             break;
 735          case GL_COMPRESSED_RG_RGTC2:
 736             RETURN_IF_SUPPORTED(MESA_FORMAT_RG_RGTC2);
 737             break;
 738          case GL_COMPRESSED_SIGNED_RG_RGTC2:
 739             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG_RGTC2);
 740             break;
 741          default:
 742             ; /* fallthrough */
 743       }
 744    }
 745
 746    if (ctx->Extensions.EXT_texture_compression_latc) {
 747       switch (internalFormat) {
 748          case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
 749             RETURN_IF_SUPPORTED(MESA_FORMAT_L_LATC1);
 750             break;
 751          case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
 752             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L_LATC1);
 753             break;
 754          case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
 755             RETURN_IF_SUPPORTED(MESA_FORMAT_LA_LATC2);
 756             break;
 757          case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
 758             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_LA_LATC2);
 759             break;
 760          default:
 761             ; /* fallthrough */
 762       }
 763    }
 764
 765    if (ctx->Extensions.ATI_texture_compression_3dc) {
 766       switch (internalFormat) {
 767          case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
 768             RETURN_IF_SUPPORTED(MESA_FORMAT_LA_LATC2);
 769             break;
 770          default:
 771             ; /* fallthrough */
 772       }
 773    }
 774
 775    _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
 776    return MESA_FORMAT_NONE;
 777 }
 778