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_S8_Z24);
 221             break;
 222          case GL_DEPTH_COMPONENT16:
 223             RETURN_IF_SUPPORTED(MESA_FORMAT_Z16);
 224             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 225          default:
 226             ; /* fallthrough */
 227       }
 228    }
 229
 230    switch (internalFormat) {
 231       case GL_COMPRESSED_ALPHA_ARB:
 232          RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
 233          break;
 234       case GL_COMPRESSED_LUMINANCE_ARB:
 235          RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
 236          break;
 237       case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
 238          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 239          break;
 240       case GL_COMPRESSED_INTENSITY_ARB:
 241          RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
 242          break;
 243       case GL_COMPRESSED_RGB_ARB:
 244          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 245              ctx->Extensions.S3_s3tc)
 246             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 247          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 248             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);
 249          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
 250          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 251          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 252          break;
 253       case GL_COMPRESSED_RGBA_ARB:
 254          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 255              ctx->Extensions.S3_s3tc)
 256             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3); /* Not rgba_dxt1, see spec */
 257          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 258             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);
 259          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
 260          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 261          break;
 262       default:
 263          ; /* fallthrough */
 264    }
 265
 266    if (ctx->Extensions.MESA_ycbcr_texture) {
 267       if (internalFormat == GL_YCBCR_MESA) {
 268          if (type == GL_UNSIGNED_SHORT_8_8_MESA)
 269             RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR);
 270          else
 271             RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR_REV);
 272       }
 273    }
 274
 275 #if FEATURE_texture_fxt1
 276    if (ctx->Extensions.TDFX_texture_compression_FXT1) {
 277       switch (internalFormat) {
 278          case GL_COMPRESSED_RGB_FXT1_3DFX:
 279             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);
 280          break;
 281          case GL_COMPRESSED_RGBA_FXT1_3DFX:
 282             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);
 283          break;
 284          default:
 285             ; /* fallthrough */
 286       }
 287    }
 288 #endif
 289
 290 #if FEATURE_texture_s3tc
 291    if (ctx->Extensions.EXT_texture_compression_s3tc) {
 292       switch (internalFormat) {
 293          case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 294             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 295             break;
 296          case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 297             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT1);
 298             break;
 299          case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 300             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);
 301             break;
 302          case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 303             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT5);
 304             break;
 305          default:
 306             ; /* fallthrough */
 307       }
 308    }
 309
 310    if (ctx->Extensions.S3_s3tc) {
 311       switch (internalFormat) {
 312          case GL_RGB_S3TC:
 313          case GL_RGB4_S3TC:
 314             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 315             break;
 316          case GL_RGBA_S3TC:
 317          case GL_RGBA4_S3TC:
 318             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);
 319             break;
 320          default:
 321             ; /* fallthrough */
 322       }
 323    }
 324 #endif
 325
 326    if (ctx->Extensions.ARB_texture_float) {
 327       switch (internalFormat) {
 328          case GL_ALPHA16F_ARB:
 329             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT16);
 330             break;
 331          case GL_ALPHA32F_ARB:
 332             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
 333             break;
 334          case GL_LUMINANCE16F_ARB:
 335             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT16);
 336             break;
 337          case GL_LUMINANCE32F_ARB:
 338             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
 339             break;
 340          case GL_LUMINANCE_ALPHA16F_ARB:
 341             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16);
 342             break;
 343          case GL_LUMINANCE_ALPHA32F_ARB:
 344             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
 345             break;
 346          case GL_INTENSITY16F_ARB:
 347             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT16);
 348             break;
 349          case GL_INTENSITY32F_ARB:
 350             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
 351             break;
 352          case GL_RGB16F_ARB:
 353             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT16);
 354             break;
 355          case GL_RGB32F_ARB:
 356             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
 357             break;
 358          case GL_RGBA16F_ARB:
 359             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 360             break;
 361          case GL_RGBA32F_ARB:
 362             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 363             break;
 364          default:
 365             ; /* fallthrough */
 366       }
 367    }
 368
 369    if (ctx->Extensions.EXT_packed_depth_stencil) {
 370       switch (internalFormat) {
 371          case GL_DEPTH_STENCIL_EXT:
 372          case GL_DEPTH24_STENCIL8_EXT:
 373             RETURN_IF_SUPPORTED(MESA_FORMAT_Z24_S8);
 374             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 375             break;
 376          default:
 377             ; /* fallthrough */
 378       }
 379    }
 380
 381    if (ctx->Extensions.ATI_envmap_bumpmap) {
 382       switch (internalFormat) {
 383          case GL_DUDV_ATI:
 384          case GL_DU8DV8_ATI:
 385             RETURN_IF_SUPPORTED(MESA_FORMAT_DUDV8);
 386             break;
 387          default:
 388             ; /* fallthrough */
 389       }
 390    }
 391
 392    if (ctx->Extensions.EXT_texture_snorm) {
 393       switch (internalFormat) {
 394          case GL_RED_SNORM:
 395          case GL_R8_SNORM:
 396             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R8);
 397             break;
 398          case GL_RG_SNORM:
 399          case GL_RG8_SNORM:
 400             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG88_REV);
 401             break;
 402          case GL_RGB_SNORM:
 403          case GL_RGB8_SNORM:
 404             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 405             /* FALLTHROUGH */
 406          case GL_RGBA_SNORM:
 407          case GL_RGBA8_SNORM:
 408             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 409             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 410             break;
 411          case GL_ALPHA_SNORM:
 412          case GL_ALPHA8_SNORM:
 413             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A8);
 414             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 415             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 416             break;
 417          case GL_LUMINANCE_SNORM:
 418          case GL_LUMINANCE8_SNORM:
 419             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L8);
 420             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 421             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 422             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 423             break;
 424          case GL_LUMINANCE_ALPHA_SNORM:
 425          case GL_LUMINANCE8_ALPHA8_SNORM:
 426             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL88);
 427             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 428             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 429             break;
 430          case GL_INTENSITY_SNORM:
 431          case GL_INTENSITY8_SNORM:
 432             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I8);
 433             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 434             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 435             break;
 436          case GL_R16_SNORM:
 437             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R16);
 438             break;
 439          case GL_RG16_SNORM:
 440             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_GR1616);
 441             break;
 442          case GL_RGB16_SNORM:
 443             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGB_16);
 444             /* FALLTHROUGH */
 445          case GL_RGBA16_SNORM:
 446             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 447             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 448             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 449             break;
 450          case GL_ALPHA16_SNORM:
 451             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A16);
 452             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 453             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 454             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 455             break;
 456          case GL_LUMINANCE16_SNORM:
 457             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L16);
 458             /* FALLTHROUGH */
 459          case GL_LUMINANCE16_ALPHA16_SNORM:
 460             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL1616);
 461             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 462             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 463             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 464             break;
 465          case GL_INTENSITY16_SNORM:
 466             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I16);
 467             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 468             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 469             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 470             break;
 471          default:
 472             ; /* fall-through */
 473       }
 474    }
 475
 476 #if FEATURE_EXT_texture_sRGB
 477    if (ctx->Extensions.EXT_texture_sRGB) {
 478       switch (internalFormat) {
 479          case GL_SRGB_EXT:
 480          case GL_SRGB8_EXT:
 481             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 482             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 483             break;
 484          case GL_SRGB_ALPHA_EXT:
 485          case GL_SRGB8_ALPHA8_EXT:
 486             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 487             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 488             break;
 489          case GL_SLUMINANCE_EXT:
 490          case GL_SLUMINANCE8_EXT:
 491             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 492             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 493             break;
 494          case GL_SLUMINANCE_ALPHA_EXT:
 495          case GL_SLUMINANCE8_ALPHA8_EXT:
 496             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 497             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 498             break;
 499          case GL_COMPRESSED_SLUMINANCE_EXT:
 500             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 501             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 502             break;
 503          case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 504             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 505             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 506             break;
 507          case GL_COMPRESSED_SRGB_EXT:
 508 #if FEATURE_texture_s3tc
 509             if (ctx->Extensions.EXT_texture_compression_s3tc)
 510                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
 511 #endif
 512             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 513             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 514             break;
 515          case GL_COMPRESSED_SRGB_ALPHA_EXT:
 516 #if FEATURE_texture_s3tc
 517             if (ctx->Extensions.EXT_texture_compression_s3tc)
 518                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3); /* Not srgba_dxt1, see spec */
 519 #endif
 520             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 521             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 522             break;
 523 #if FEATURE_texture_s3tc
 524          case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 525             if (ctx->Extensions.EXT_texture_compression_s3tc)
 526                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
 527             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 528             break;
 529          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 530             if (ctx->Extensions.EXT_texture_compression_s3tc)
 531                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT1);
 532             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 533             break;
 534          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 535             if (ctx->Extensions.EXT_texture_compression_s3tc)
 536                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3);
 537             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 538             break;
 539          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 540             if (ctx->Extensions.EXT_texture_compression_s3tc)
 541                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT5);
 542             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 543             break;
 544 #endif
 545          default:
 546             ; /* fallthrough */
 547       }
 548    }
 549 #endif /* FEATURE_EXT_texture_sRGB */
 550
 551    if (ctx->Extensions.EXT_texture_integer) {
 552       switch (internalFormat) {
 553       case GL_RGBA32UI_EXT:
 554       case GL_RGB32UI_EXT:
 555       case GL_ALPHA32UI_EXT:
 556       case GL_INTENSITY32UI_EXT:
 557       case GL_LUMINANCE32UI_EXT:
 558       case GL_LUMINANCE_ALPHA32UI_EXT:
 559          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 560          break;
 561       case GL_RGBA16UI_EXT:
 562       case GL_RGB16UI_EXT:
 563       case GL_ALPHA16UI_EXT:
 564       case GL_INTENSITY16UI_EXT:
 565       case GL_LUMINANCE16UI_EXT:
 566       case GL_LUMINANCE_ALPHA16UI_EXT:
 567          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 568          break;
 569       case GL_RGBA8UI_EXT:
 570       case GL_RGB8UI_EXT:
 571       case GL_ALPHA8UI_EXT:
 572       case GL_INTENSITY8UI_EXT:
 573       case GL_LUMINANCE8UI_EXT:
 574       case GL_LUMINANCE_ALPHA8UI_EXT:
 575          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 576          break;
 577       case GL_RGBA32I_EXT:
 578       case GL_RGB32I_EXT:
 579       case GL_ALPHA32I_EXT:
 580       case GL_INTENSITY32I_EXT:
 581       case GL_LUMINANCE32I_EXT:
 582       case GL_LUMINANCE_ALPHA32I_EXT:
 583          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 584          break;
 585       case GL_RGBA16I_EXT:
 586       case GL_RGB16I_EXT:
 587       case GL_ALPHA16I_EXT:
 588       case GL_INTENSITY16I_EXT:
 589       case GL_LUMINANCE16I_EXT:
 590       case GL_LUMINANCE_ALPHA16I_EXT:
 591          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 592          break;
 593       case GL_RGBA8I_EXT:
 594       case GL_RGB8I_EXT:
 595       case GL_ALPHA8I_EXT:
 596       case GL_INTENSITY8I_EXT:
 597       case GL_LUMINANCE8I_EXT:
 598       case GL_LUMINANCE_ALPHA8I_EXT:
 599          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 600          break;
 601       }
 602    }
 603
 604    if (ctx->Extensions.ARB_texture_rg) {
 605       switch (internalFormat) {
 606       case GL_R8:
 607       case GL_RED:
 608       case GL_COMPRESSED_RED:
 609          RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
 610          break;
 611
 612       case GL_R16:
 613          RETURN_IF_SUPPORTED(MESA_FORMAT_R16);
 614          break;
 615
 616       case GL_RG:
 617       case GL_RG8:
 618       case GL_COMPRESSED_RG:
 619          RETURN_IF_SUPPORTED(MESA_FORMAT_RG88);
 620          break;
 621
 622       case GL_RG16:
 623          RETURN_IF_SUPPORTED(MESA_FORMAT_RG1616);
 624          break;
 625
 626       default:
 627          ; /* fallthrough */
 628       }
 629    }
 630
 631    if (ctx->Extensions.ARB_texture_rg && ctx->Extensions.ARB_texture_float) {
 632       switch (internalFormat) {
 633       case GL_R16F:
 634          return MESA_FORMAT_R_FLOAT16;
 635       case GL_R32F:
 636          return MESA_FORMAT_R_FLOAT32;
 637       case GL_RG16F:
 638          return MESA_FORMAT_RG_FLOAT16;
 639       case GL_RG32F:
 640          return MESA_FORMAT_RG_FLOAT32;
 641
 642       default:
 643          ; /* fallthrough */
 644       }
 645    }
 646
 647    if (ctx->Extensions.EXT_texture_format_BGRA8888) {
 648       switch (internalFormat) {
 649       case GL_BGRA:
 650          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 651          break;
 652
 653       default:
 654          ; /* fallthrough */
 655       }
 656    }
 657
 658    if (ctx->Extensions.ARB_texture_compression_rgtc) {
 659       switch (internalFormat) {
 660          case GL_COMPRESSED_RED_RGTC1:
 661             RETURN_IF_SUPPORTED(MESA_FORMAT_RED_RGTC1);
 662             break;
 663          case GL_COMPRESSED_SIGNED_RED_RGTC1:
 664             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RED_RGTC1);
 665             break;
 666          case GL_COMPRESSED_RG_RGTC2:
 667             RETURN_IF_SUPPORTED(MESA_FORMAT_RG_RGTC2);
 668             break;
 669          case GL_COMPRESSED_SIGNED_RG_RGTC2:
 670             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG_RGTC2);
 671             break;
 672          default:
 673             ; /* fallthrough */
 674       }
 675    }
 676
 677    if (ctx->Extensions.EXT_texture_compression_latc) {
 678       switch (internalFormat) {
 679          case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
 680             RETURN_IF_SUPPORTED(MESA_FORMAT_L_LATC1);
 681             break;
 682          case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
 683             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L_LATC1);
 684             break;
 685          case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
 686             RETURN_IF_SUPPORTED(MESA_FORMAT_LA_LATC2);
 687             break;
 688          case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
 689             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_LA_LATC2);
 690             break;
 691          default:
 692             ; /* fallthrough */
 693       }
 694    }
 695
 696    if (ctx->Extensions.ATI_texture_compression_3dc) {
 697       switch (internalFormat) {
 698          case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
 699             RETURN_IF_SUPPORTED(MESA_FORMAT_LA_LATC2);
 700             break;
 701          default:
 702             ; /* fallthrough */
 703       }
 704    }
 705
 706    _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
 707    return MESA_FORMAT_NONE;
 708 }
 709