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             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
 331             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 332             break;
 333          case GL_ALPHA32F_ARB:
 334             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
 335             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 336             break;
 337          case GL_LUMINANCE16F_ARB:
 338             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT16);
 339             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
 340             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 341             break;
 342          case GL_LUMINANCE32F_ARB:
 343             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
 344             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 345             break;
 346          case GL_LUMINANCE_ALPHA16F_ARB:
 347             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16);
 348             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
 349             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 350             break;
 351          case GL_LUMINANCE_ALPHA32F_ARB:
 352             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
 353             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 354             break;
 355          case GL_INTENSITY16F_ARB:
 356             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT16);
 357             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
 358             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 359             break;
 360          case GL_INTENSITY32F_ARB:
 361             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
 362             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 363             break;
 364          case GL_RGB16F_ARB:
 365             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT16);
 366             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
 367             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 368             break;
 369          case GL_RGB32F_ARB:
 370             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
 371             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 372             break;
 373          case GL_RGBA16F_ARB:
 374             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 375             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 376             break;
 377          case GL_RGBA32F_ARB:
 378             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 379             break;
 380          default:
 381             ; /* fallthrough */
 382       }
 383    }
 384
 385    if (ctx->Extensions.EXT_texture_shared_exponent) {
 386       switch (internalFormat) {
 387          case GL_RGB9_E5:
 388             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB9_E5_FLOAT);
 389             break;
 390          default:
 391             ; /* fallthrough */
 392       }
 393    }
 394
 395    if (ctx->Extensions.EXT_packed_depth_stencil) {
 396       switch (internalFormat) {
 397          case GL_DEPTH_STENCIL_EXT:
 398          case GL_DEPTH24_STENCIL8_EXT:
 399             RETURN_IF_SUPPORTED(MESA_FORMAT_Z24_S8);
 400             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 401             break;
 402          default:
 403             ; /* fallthrough */
 404       }
 405    }
 406
 407    if (ctx->Extensions.ATI_envmap_bumpmap) {
 408       switch (internalFormat) {
 409          case GL_DUDV_ATI:
 410          case GL_DU8DV8_ATI:
 411             RETURN_IF_SUPPORTED(MESA_FORMAT_DUDV8);
 412             break;
 413          default:
 414             ; /* fallthrough */
 415       }
 416    }
 417
 418    if (ctx->Extensions.EXT_texture_snorm) {
 419       switch (internalFormat) {
 420          case GL_RED_SNORM:
 421          case GL_R8_SNORM:
 422             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R8);
 423             break;
 424          case GL_RG_SNORM:
 425          case GL_RG8_SNORM:
 426             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG88_REV);
 427             break;
 428          case GL_RGB_SNORM:
 429          case GL_RGB8_SNORM:
 430             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 431             /* FALLTHROUGH */
 432          case GL_RGBA_SNORM:
 433          case GL_RGBA8_SNORM:
 434             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 435             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 436             break;
 437          case GL_ALPHA_SNORM:
 438          case GL_ALPHA8_SNORM:
 439             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A8);
 440             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 441             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 442             break;
 443          case GL_LUMINANCE_SNORM:
 444          case GL_LUMINANCE8_SNORM:
 445             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L8);
 446             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 447             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 448             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 449             break;
 450          case GL_LUMINANCE_ALPHA_SNORM:
 451          case GL_LUMINANCE8_ALPHA8_SNORM:
 452             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL88);
 453             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 454             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 455             break;
 456          case GL_INTENSITY_SNORM:
 457          case GL_INTENSITY8_SNORM:
 458             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I8);
 459             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 460             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 461             break;
 462          case GL_R16_SNORM:
 463             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R16);
 464             break;
 465          case GL_RG16_SNORM:
 466             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_GR1616);
 467             break;
 468          case GL_RGB16_SNORM:
 469             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGB_16);
 470             /* FALLTHROUGH */
 471          case GL_RGBA16_SNORM:
 472             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 473             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 474             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 475             break;
 476          case GL_ALPHA16_SNORM:
 477             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A16);
 478             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 479             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 480             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 481             break;
 482          case GL_LUMINANCE16_SNORM:
 483             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L16);
 484             /* FALLTHROUGH */
 485          case GL_LUMINANCE16_ALPHA16_SNORM:
 486             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL1616);
 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_INTENSITY16_SNORM:
 492             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I16);
 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          default:
 498             ; /* fall-through */
 499       }
 500    }
 501
 502 #if FEATURE_EXT_texture_sRGB
 503    if (ctx->Extensions.EXT_texture_sRGB) {
 504       switch (internalFormat) {
 505          case GL_SRGB_EXT:
 506          case GL_SRGB8_EXT:
 507             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 508             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 509             break;
 510          case GL_SRGB_ALPHA_EXT:
 511          case GL_SRGB8_ALPHA8_EXT:
 512             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 513             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 514             break;
 515          case GL_SLUMINANCE_EXT:
 516          case GL_SLUMINANCE8_EXT:
 517             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 518             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 519             break;
 520          case GL_SLUMINANCE_ALPHA_EXT:
 521          case GL_SLUMINANCE8_ALPHA8_EXT:
 522             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 523             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 524             break;
 525          case GL_COMPRESSED_SLUMINANCE_EXT:
 526             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 527             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 528             break;
 529          case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 530             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 531             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 532             break;
 533          case GL_COMPRESSED_SRGB_EXT:
 534 #if FEATURE_texture_s3tc
 535             if (ctx->Extensions.EXT_texture_compression_s3tc)
 536                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
 537 #endif
 538             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 539             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 540             break;
 541          case GL_COMPRESSED_SRGB_ALPHA_EXT:
 542 #if FEATURE_texture_s3tc
 543             if (ctx->Extensions.EXT_texture_compression_s3tc)
 544                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3); /* Not srgba_dxt1, see spec */
 545 #endif
 546             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 547             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 548             break;
 549 #if FEATURE_texture_s3tc
 550          case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 551             if (ctx->Extensions.EXT_texture_compression_s3tc)
 552                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
 553             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 554             break;
 555          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 556             if (ctx->Extensions.EXT_texture_compression_s3tc)
 557                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT1);
 558             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 559             break;
 560          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 561             if (ctx->Extensions.EXT_texture_compression_s3tc)
 562                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3);
 563             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 564             break;
 565          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 566             if (ctx->Extensions.EXT_texture_compression_s3tc)
 567                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT5);
 568             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 569             break;
 570 #endif
 571          default:
 572             ; /* fallthrough */
 573       }
 574    }
 575 #endif /* FEATURE_EXT_texture_sRGB */
 576
 577    if (ctx->Extensions.EXT_texture_integer) {
 578       switch (internalFormat) {
 579       case GL_RGBA32UI_EXT:
 580       case GL_RGB32UI_EXT:
 581       case GL_ALPHA32UI_EXT:
 582       case GL_INTENSITY32UI_EXT:
 583       case GL_LUMINANCE32UI_EXT:
 584       case GL_LUMINANCE_ALPHA32UI_EXT:
 585          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 586          break;
 587       case GL_RGBA16UI_EXT:
 588       case GL_RGB16UI_EXT:
 589       case GL_ALPHA16UI_EXT:
 590       case GL_INTENSITY16UI_EXT:
 591       case GL_LUMINANCE16UI_EXT:
 592       case GL_LUMINANCE_ALPHA16UI_EXT:
 593          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 594          break;
 595       case GL_RGBA8UI_EXT:
 596       case GL_RGB8UI_EXT:
 597       case GL_ALPHA8UI_EXT:
 598       case GL_INTENSITY8UI_EXT:
 599       case GL_LUMINANCE8UI_EXT:
 600       case GL_LUMINANCE_ALPHA8UI_EXT:
 601          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 602          break;
 603       case GL_RGBA32I_EXT:
 604       case GL_RGB32I_EXT:
 605       case GL_ALPHA32I_EXT:
 606       case GL_INTENSITY32I_EXT:
 607       case GL_LUMINANCE32I_EXT:
 608       case GL_LUMINANCE_ALPHA32I_EXT:
 609          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 610          break;
 611       case GL_RGBA16I_EXT:
 612       case GL_RGB16I_EXT:
 613       case GL_ALPHA16I_EXT:
 614       case GL_INTENSITY16I_EXT:
 615       case GL_LUMINANCE16I_EXT:
 616       case GL_LUMINANCE_ALPHA16I_EXT:
 617          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 618          break;
 619       case GL_RGBA8I_EXT:
 620       case GL_RGB8I_EXT:
 621       case GL_ALPHA8I_EXT:
 622       case GL_INTENSITY8I_EXT:
 623       case GL_LUMINANCE8I_EXT:
 624       case GL_LUMINANCE_ALPHA8I_EXT:
 625          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 626          break;
 627       }
 628    }
 629
 630    if (ctx->Extensions.ARB_texture_rg) {
 631       switch (internalFormat) {
 632       case GL_R8:
 633       case GL_RED:
 634          RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
 635          break;
 636
 637       case GL_COMPRESSED_RED:
 638          RETURN_IF_SUPPORTED(MESA_FORMAT_RED_RGTC1);
 639          RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
 640          break;
 641
 642       case GL_R16:
 643          RETURN_IF_SUPPORTED(MESA_FORMAT_R16);
 644          break;
 645
 646       case GL_RG:
 647       case GL_RG8:
 648          RETURN_IF_SUPPORTED(MESA_FORMAT_RG88);
 649          break;
 650
 651       case GL_COMPRESSED_RG:
 652          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_RGTC2);
 653          RETURN_IF_SUPPORTED(MESA_FORMAT_RG88);
 654          break;
 655
 656       case GL_RG16:
 657          RETURN_IF_SUPPORTED(MESA_FORMAT_RG1616);
 658          break;
 659
 660       default:
 661          ; /* fallthrough */
 662       }
 663    }
 664
 665    if (ctx->Extensions.ARB_texture_rg && ctx->Extensions.ARB_texture_float) {
 666       switch (internalFormat) {
 667       case GL_R16F:
 668          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT16);
 669          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT32);
 670          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 671          break;
 672       case GL_R32F:
 673          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT32);
 674          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 675          break;
 676       case GL_RG16F:
 677          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT16);
 678          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 679          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 680          break;
 681       case GL_RG32F:
 682          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 683          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 684          break;
 685
 686       default:
 687          ; /* fallthrough */
 688       }
 689    }
 690
 691    if (ctx->Extensions.EXT_texture_format_BGRA8888) {
 692       switch (internalFormat) {
 693       case GL_BGRA:
 694          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 695          break;
 696
 697       default:
 698          ; /* fallthrough */
 699       }
 700    }
 701
 702    if (ctx->Extensions.ARB_texture_compression_rgtc) {
 703       switch (internalFormat) {
 704          case GL_COMPRESSED_RED_RGTC1:
 705             RETURN_IF_SUPPORTED(MESA_FORMAT_RED_RGTC1);
 706             break;
 707          case GL_COMPRESSED_SIGNED_RED_RGTC1:
 708             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RED_RGTC1);
 709             break;
 710          case GL_COMPRESSED_RG_RGTC2:
 711             RETURN_IF_SUPPORTED(MESA_FORMAT_RG_RGTC2);
 712             break;
 713          case GL_COMPRESSED_SIGNED_RG_RGTC2:
 714             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG_RGTC2);
 715             break;
 716          default:
 717             ; /* fallthrough */
 718       }
 719    }
 720
 721    if (ctx->Extensions.EXT_texture_compression_latc) {
 722       switch (internalFormat) {
 723          case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
 724             RETURN_IF_SUPPORTED(MESA_FORMAT_L_LATC1);
 725             break;
 726          case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
 727             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L_LATC1);
 728             break;
 729          case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
 730             RETURN_IF_SUPPORTED(MESA_FORMAT_LA_LATC2);
 731             break;
 732          case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
 733             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_LA_LATC2);
 734             break;
 735          default:
 736             ; /* fallthrough */
 737       }
 738    }
 739
 740    if (ctx->Extensions.ATI_texture_compression_3dc) {
 741       switch (internalFormat) {
 742          case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
 743             RETURN_IF_SUPPORTED(MESA_FORMAT_LA_LATC2);
 744             break;
 745          default:
 746             ; /* fallthrough */
 747       }
 748    }
 749
 750    _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
 751    return MESA_FORMAT_NONE;
 752 }
 753