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       default:
 201          ; /* fallthrough */
 202    }
 203
 204    if (ctx->Extensions.ARB_depth_texture) {
 205       switch (internalFormat) {
 206          case GL_DEPTH_COMPONENT:
 207          case GL_DEPTH_COMPONENT24:
 208          case GL_DEPTH_COMPONENT32:
 209             RETURN_IF_SUPPORTED(MESA_FORMAT_Z32);
 210             RETURN_IF_SUPPORTED(MESA_FORMAT_X8_Z24);
 211             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 212             break;
 213          case GL_DEPTH_COMPONENT16:
 214             RETURN_IF_SUPPORTED(MESA_FORMAT_Z16);
 215             RETURN_IF_SUPPORTED(MESA_FORMAT_X8_Z24);
 216             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 217          default:
 218             ; /* fallthrough */
 219       }
 220    }
 221
 222    switch (internalFormat) {
 223       case GL_COMPRESSED_ALPHA_ARB:
 224          RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
 225          break;
 226       case GL_COMPRESSED_LUMINANCE_ARB:
 227          RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
 228          break;
 229       case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
 230          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 231          break;
 232       case GL_COMPRESSED_INTENSITY_ARB:
 233          RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
 234          break;
 235       case GL_COMPRESSED_RGB_ARB:
 236          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 237              ctx->Extensions.S3_s3tc)
 238             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 239          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 240             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);
 241          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
 242          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 243          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 244          break;
 245       case GL_COMPRESSED_RGBA_ARB:
 246          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 247              ctx->Extensions.S3_s3tc)
 248             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3); /* Not rgba_dxt1, see spec */
 249          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 250             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);
 251          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
 252          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 253          break;
 254       default:
 255          ; /* fallthrough */
 256    }
 257
 258    if (ctx->Extensions.MESA_ycbcr_texture) {
 259       if (internalFormat == GL_YCBCR_MESA) {
 260          if (type == GL_UNSIGNED_SHORT_8_8_MESA)
 261             RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR);
 262          else
 263             RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR_REV);
 264       }
 265    }
 266
 267 #if FEATURE_texture_fxt1
 268    if (ctx->Extensions.TDFX_texture_compression_FXT1) {
 269       switch (internalFormat) {
 270          case GL_COMPRESSED_RGB_FXT1_3DFX:
 271             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);
 272          break;
 273          case GL_COMPRESSED_RGBA_FXT1_3DFX:
 274             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);
 275          break;
 276          default:
 277             ; /* fallthrough */
 278       }
 279    }
 280 #endif
 281
 282 #if FEATURE_texture_s3tc
 283    if (ctx->Extensions.EXT_texture_compression_s3tc) {
 284       switch (internalFormat) {
 285          case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 286             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 287             break;
 288          case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 289             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT1);
 290             break;
 291          case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 292             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);
 293             break;
 294          case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 295             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT5);
 296             break;
 297          default:
 298             ; /* fallthrough */
 299       }
 300    }
 301
 302    if (ctx->Extensions.S3_s3tc) {
 303       switch (internalFormat) {
 304          case GL_RGB_S3TC:
 305          case GL_RGB4_S3TC:
 306             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 307             break;
 308          case GL_RGBA_S3TC:
 309          case GL_RGBA4_S3TC:
 310             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);
 311             break;
 312          default:
 313             ; /* fallthrough */
 314       }
 315    }
 316 #endif
 317
 318    if (ctx->Extensions.ARB_texture_float) {
 319       switch (internalFormat) {
 320          case GL_ALPHA16F_ARB:
 321             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT16);
 322             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
 323             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 324             break;
 325          case GL_ALPHA32F_ARB:
 326             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
 327             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 328             break;
 329          case GL_LUMINANCE16F_ARB:
 330             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT16);
 331             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
 332             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 333             break;
 334          case GL_LUMINANCE32F_ARB:
 335             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
 336             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 337             break;
 338          case GL_LUMINANCE_ALPHA16F_ARB:
 339             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16);
 340             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
 341             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 342             break;
 343          case GL_LUMINANCE_ALPHA32F_ARB:
 344             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
 345             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 346             break;
 347          case GL_INTENSITY16F_ARB:
 348             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT16);
 349             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
 350             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 351             break;
 352          case GL_INTENSITY32F_ARB:
 353             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
 354             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 355             break;
 356          case GL_RGB16F_ARB:
 357             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT16);
 358             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
 359             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 360             break;
 361          case GL_RGB32F_ARB:
 362             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
 363             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 364             break;
 365          case GL_RGBA16F_ARB:
 366             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 367             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 368             break;
 369          case GL_RGBA32F_ARB:
 370             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 371             break;
 372          default:
 373             ; /* fallthrough */
 374       }
 375    }
 376
 377    if (ctx->Extensions.EXT_texture_shared_exponent) {
 378       switch (internalFormat) {
 379          case GL_RGB9_E5:
 380             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_RGB9_E5_FLOAT]);
 381             return MESA_FORMAT_RGB9_E5_FLOAT;
 382          default:
 383             ; /* fallthrough */
 384       }
 385    }
 386
 387    if (ctx->Extensions.EXT_packed_float) {
 388       switch (internalFormat) {
 389          case GL_R11F_G11F_B10F:
 390             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_R11_G11_B10_FLOAT]);
 391             return MESA_FORMAT_R11_G11_B10_FLOAT;
 392          default:
 393             ; /* fallthrough */
 394       }
 395    }
 396
 397    if (ctx->Extensions.EXT_packed_depth_stencil) {
 398       switch (internalFormat) {
 399          case GL_DEPTH_STENCIL_EXT:
 400          case GL_DEPTH24_STENCIL8_EXT:
 401             RETURN_IF_SUPPORTED(MESA_FORMAT_Z24_S8);
 402             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 403             break;
 404          default:
 405             ; /* fallthrough */
 406       }
 407    }
 408
 409    if (ctx->Extensions.ARB_depth_buffer_float) {
 410       switch (internalFormat) {
 411          case GL_DEPTH_COMPONENT32F:
 412             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_Z32_FLOAT]);
 413             return MESA_FORMAT_Z32_FLOAT;
 414          case GL_DEPTH32F_STENCIL8:
 415             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_Z32_FLOAT_X24S8]);
 416             return MESA_FORMAT_Z32_FLOAT_X24S8;
 417          default:
 418             ; /* fallthrough */
 419       }
 420    }
 421
 422    if (ctx->Extensions.ATI_envmap_bumpmap) {
 423       switch (internalFormat) {
 424          case GL_DUDV_ATI:
 425          case GL_DU8DV8_ATI:
 426             RETURN_IF_SUPPORTED(MESA_FORMAT_DUDV8);
 427             break;
 428          default:
 429             ; /* fallthrough */
 430       }
 431    }
 432
 433    if (ctx->Extensions.EXT_texture_snorm) {
 434       switch (internalFormat) {
 435          case GL_RED_SNORM:
 436          case GL_R8_SNORM:
 437             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R8);
 438             break;
 439          case GL_RG_SNORM:
 440          case GL_RG8_SNORM:
 441             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG88_REV);
 442             break;
 443          case GL_RGB_SNORM:
 444          case GL_RGB8_SNORM:
 445             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 446             /* FALLTHROUGH */
 447          case GL_RGBA_SNORM:
 448          case GL_RGBA8_SNORM:
 449             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 450             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 451             break;
 452          case GL_ALPHA_SNORM:
 453          case GL_ALPHA8_SNORM:
 454             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A8);
 455             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 456             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 457             break;
 458          case GL_LUMINANCE_SNORM:
 459          case GL_LUMINANCE8_SNORM:
 460             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L8);
 461             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 462             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 463             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 464             break;
 465          case GL_LUMINANCE_ALPHA_SNORM:
 466          case GL_LUMINANCE8_ALPHA8_SNORM:
 467             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL88);
 468             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 469             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 470             break;
 471          case GL_INTENSITY_SNORM:
 472          case GL_INTENSITY8_SNORM:
 473             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I8);
 474             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 475             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 476             break;
 477          case GL_R16_SNORM:
 478             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R16);
 479             break;
 480          case GL_RG16_SNORM:
 481             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_GR1616);
 482             break;
 483          case GL_RGB16_SNORM:
 484             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGB_16);
 485             /* FALLTHROUGH */
 486          case GL_RGBA16_SNORM:
 487             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 488             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 489             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 490             break;
 491          case GL_ALPHA16_SNORM:
 492             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A16);
 493             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 494             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 495             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 496             break;
 497          case GL_LUMINANCE16_SNORM:
 498             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L16);
 499             /* FALLTHROUGH */
 500          case GL_LUMINANCE16_ALPHA16_SNORM:
 501             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL1616);
 502             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 503             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 504             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 505             break;
 506          case GL_INTENSITY16_SNORM:
 507             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I16);
 508             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 509             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 510             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 511             break;
 512          default:
 513             ; /* fall-through */
 514       }
 515    }
 516
 517 #if FEATURE_EXT_texture_sRGB
 518    if (ctx->Extensions.EXT_texture_sRGB) {
 519       switch (internalFormat) {
 520          case GL_SRGB_EXT:
 521          case GL_SRGB8_EXT:
 522             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 523             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 524             break;
 525          case GL_SRGB_ALPHA_EXT:
 526          case GL_SRGB8_ALPHA8_EXT:
 527             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 528             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 529             break;
 530          case GL_SLUMINANCE_EXT:
 531          case GL_SLUMINANCE8_EXT:
 532             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 533             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 534             break;
 535          case GL_SLUMINANCE_ALPHA_EXT:
 536          case GL_SLUMINANCE8_ALPHA8_EXT:
 537             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 538             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 539             break;
 540          case GL_COMPRESSED_SLUMINANCE_EXT:
 541             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 542             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 543             break;
 544          case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 545             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 546             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 547             break;
 548          case GL_COMPRESSED_SRGB_EXT:
 549 #if FEATURE_texture_s3tc
 550             if (ctx->Extensions.EXT_texture_compression_s3tc)
 551                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
 552 #endif
 553             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 554             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 555             break;
 556          case GL_COMPRESSED_SRGB_ALPHA_EXT:
 557 #if FEATURE_texture_s3tc
 558             if (ctx->Extensions.EXT_texture_compression_s3tc)
 559                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3); /* Not srgba_dxt1, see spec */
 560 #endif
 561             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 562             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 563             break;
 564 #if FEATURE_texture_s3tc
 565          case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 566             if (ctx->Extensions.EXT_texture_compression_s3tc)
 567                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
 568             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 569             break;
 570          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 571             if (ctx->Extensions.EXT_texture_compression_s3tc)
 572                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT1);
 573             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 574             break;
 575          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 576             if (ctx->Extensions.EXT_texture_compression_s3tc)
 577                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3);
 578             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 579             break;
 580          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 581             if (ctx->Extensions.EXT_texture_compression_s3tc)
 582                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT5);
 583             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 584             break;
 585 #endif
 586          default:
 587             ; /* fallthrough */
 588       }
 589    }
 590 #endif /* FEATURE_EXT_texture_sRGB */
 591
 592    if (ctx->Extensions.EXT_texture_integer) {
 593       switch (internalFormat) {
 594       case GL_RGBA32UI_EXT:
 595       case GL_RGB32UI_EXT:
 596       case GL_ALPHA32UI_EXT:
 597       case GL_INTENSITY32UI_EXT:
 598       case GL_LUMINANCE32UI_EXT:
 599       case GL_LUMINANCE_ALPHA32UI_EXT:
 600          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 601          break;
 602       case GL_RGBA16UI_EXT:
 603       case GL_RGB16UI_EXT:
 604       case GL_ALPHA16UI_EXT:
 605       case GL_INTENSITY16UI_EXT:
 606       case GL_LUMINANCE16UI_EXT:
 607       case GL_LUMINANCE_ALPHA16UI_EXT:
 608          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 609          break;
 610       case GL_RGBA8UI_EXT:
 611       case GL_RGB8UI_EXT:
 612       case GL_ALPHA8UI_EXT:
 613       case GL_INTENSITY8UI_EXT:
 614       case GL_LUMINANCE8UI_EXT:
 615       case GL_LUMINANCE_ALPHA8UI_EXT:
 616          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 617          break;
 618       case GL_RGBA32I_EXT:
 619       case GL_RGB32I_EXT:
 620       case GL_ALPHA32I_EXT:
 621       case GL_INTENSITY32I_EXT:
 622       case GL_LUMINANCE32I_EXT:
 623       case GL_LUMINANCE_ALPHA32I_EXT:
 624          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 625          break;
 626       case GL_RGBA16I_EXT:
 627       case GL_RGB16I_EXT:
 628       case GL_ALPHA16I_EXT:
 629       case GL_INTENSITY16I_EXT:
 630       case GL_LUMINANCE16I_EXT:
 631       case GL_LUMINANCE_ALPHA16I_EXT:
 632          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 633          break;
 634       case GL_RGBA8I_EXT:
 635       case GL_RGB8I_EXT:
 636       case GL_ALPHA8I_EXT:
 637       case GL_INTENSITY8I_EXT:
 638       case GL_LUMINANCE8I_EXT:
 639       case GL_LUMINANCE_ALPHA8I_EXT:
 640          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 641          break;
 642       }
 643    }
 644
 645    if (ctx->Extensions.ARB_texture_rg) {
 646       switch (internalFormat) {
 647       case GL_R8:
 648       case GL_RED:
 649          RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
 650          break;
 651
 652       case GL_COMPRESSED_RED:
 653          RETURN_IF_SUPPORTED(MESA_FORMAT_RED_RGTC1);
 654          RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
 655          break;
 656
 657       case GL_R16:
 658          RETURN_IF_SUPPORTED(MESA_FORMAT_R16);
 659          break;
 660
 661       case GL_RG:
 662       case GL_RG8:
 663          RETURN_IF_SUPPORTED(MESA_FORMAT_RG88);
 664          break;
 665
 666       case GL_COMPRESSED_RG:
 667          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_RGTC2);
 668          RETURN_IF_SUPPORTED(MESA_FORMAT_RG88);
 669          break;
 670
 671       case GL_RG16:
 672          RETURN_IF_SUPPORTED(MESA_FORMAT_RG1616);
 673          break;
 674
 675       default:
 676          ; /* fallthrough */
 677       }
 678    }
 679
 680    if (ctx->Extensions.ARB_texture_rg && ctx->Extensions.ARB_texture_float) {
 681       switch (internalFormat) {
 682       case GL_R16F:
 683          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT16);
 684          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT32);
 685          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 686          break;
 687       case GL_R32F:
 688          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT32);
 689          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 690          break;
 691       case GL_RG16F:
 692          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT16);
 693          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 694          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 695          break;
 696       case GL_RG32F:
 697          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 698          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 699          break;
 700
 701       default:
 702          ; /* fallthrough */
 703       }
 704    }
 705
 706    if (ctx->Extensions.EXT_texture_format_BGRA8888) {
 707       switch (internalFormat) {
 708       case GL_BGRA:
 709          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 710          break;
 711
 712       default:
 713          ; /* fallthrough */
 714       }
 715    }
 716
 717    if (ctx->Extensions.ARB_texture_compression_rgtc) {
 718       switch (internalFormat) {
 719          case GL_COMPRESSED_RED_RGTC1:
 720             RETURN_IF_SUPPORTED(MESA_FORMAT_RED_RGTC1);
 721             break;
 722          case GL_COMPRESSED_SIGNED_RED_RGTC1:
 723             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RED_RGTC1);
 724             break;
 725          case GL_COMPRESSED_RG_RGTC2:
 726             RETURN_IF_SUPPORTED(MESA_FORMAT_RG_RGTC2);
 727             break;
 728          case GL_COMPRESSED_SIGNED_RG_RGTC2:
 729             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG_RGTC2);
 730             break;
 731          default:
 732             ; /* fallthrough */
 733       }
 734    }
 735
 736    if (ctx->Extensions.EXT_texture_compression_latc) {
 737       switch (internalFormat) {
 738          case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
 739             RETURN_IF_SUPPORTED(MESA_FORMAT_L_LATC1);
 740             break;
 741          case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
 742             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L_LATC1);
 743             break;
 744          case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
 745             RETURN_IF_SUPPORTED(MESA_FORMAT_LA_LATC2);
 746             break;
 747          case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
 748             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_LA_LATC2);
 749             break;
 750          default:
 751             ; /* fallthrough */
 752       }
 753    }
 754
 755    if (ctx->Extensions.ATI_texture_compression_3dc) {
 756       switch (internalFormat) {
 757          case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
 758             RETURN_IF_SUPPORTED(MESA_FORMAT_LA_LATC2);
 759             break;
 760          default:
 761             ; /* fallthrough */
 762       }
 763    }
 764
 765    _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
 766    return MESA_FORMAT_NONE;
 767 }
 768