src/mesa/main/texformat.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.7
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  * Copyright (c) 2008-2009 VMware, Inc.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 /**
  28  * \file texformat.c
  29  * Texture formats.
  30  *
  31  * \author Gareth Hughes
  32  * \author Brian Paul
  33  */
  34
  35
  36 #include "context.h"
  37 #include "enums.h"
  38 #include "mfeatures.h"
  39 #include "mtypes.h"
  40 #include "texcompress.h"
  41 #include "texformat.h"
  42
  43 #define RETURN_IF_SUPPORTED(f) do {             \
  44    if (ctx->TextureFormatSupported[f])          \
  45       return f;                                 \
  46 } while (0)
  47
  48 /**
  49  * Choose an appropriate texture format given the format, type and
  50  * internalFormat parameters passed to glTexImage().
  51  *
  52  * \param ctx  the GL context.
  53  * \param internalFormat  user's prefered internal texture format.
  54  * \param format  incoming image pixel format.
  55  * \param type  incoming image data type.
  56  *
  57  * \return a pointer to a gl_texture_format object which describes the
  58  * choosen texture format, or NULL on failure.
  59  *
  60  * This is called via dd_function_table::ChooseTextureFormat.  Hardware drivers
  61  * will typically override this function with a specialized version.
  62  */
  63 gl_format
  64 _mesa_choose_tex_format(struct gl_context *ctx, GLenum target,
  65                         GLint internalFormat, GLenum format, GLenum type)
  66 {
  67    (void) format;
  68    (void) type;
  69
  70    switch (internalFormat) {
  71       /* shallow RGBA formats */
  72       case 4:
  73       case GL_RGBA:
  74          if (type == GL_UNSIGNED_SHORT_4_4_4_4_REV) {
  75             RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);
  76          } else if (type == GL_UNSIGNED_SHORT_1_5_5_5_REV) {
  77             RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB1555);
  78          } else if (type == GL_UNSIGNED_INT_2_10_10_10_REV) {
  79             RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB2101010);
  80          }
  81          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
  82          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
  83          break;
  84
  85       case GL_RGBA8:
  86          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
  87          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
  88          break;
  89       case GL_RGB5_A1:
  90          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB1555);
  91          break;
  92       case GL_RGBA2:
  93          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444_REV); /* just to test another format*/
  94          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);
  95          break;
  96       case GL_RGBA4:
  97          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);
  98          break;
  99
 100       /* deep RGBA formats */
 101       case GL_RGB10_A2:
 102          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB2101010);
 103          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 104          break;
 105       case GL_RGBA12:
 106       case GL_RGBA16:
 107          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);
 108          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);
 109          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
 110          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 111          break;
 112
 113       /* shallow RGB formats */
 114       case 3:
 115       case GL_RGB:
 116          if (type == GL_UNSIGNED_INT_2_10_10_10_REV) {
 117             RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB2101010);
 118          }
 119          /* fallthrough */
 120       case GL_RGB8:
 121          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
 122          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 123          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 124          break;
 125       case GL_R3_G3_B2:
 126          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB332);
 127          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);
 128          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565_REV);
 129          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
 130          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 131          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 132          break;
 133       case GL_RGB4:
 134          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565_REV); /* just to test another format */
 135          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);
 136          break;
 137       case GL_RGB5:
 138          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);
 139          break;
 140
 141       /* deep RGB formats */
 142       case GL_RGB10:
 143       case GL_RGB12:
 144       case GL_RGB16:
 145          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);
 146          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 147          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 148          break;
 149
 150       /* Alpha formats */
 151       case GL_ALPHA:
 152       case GL_ALPHA4:
 153       case GL_ALPHA8:
 154          RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
 155          break;
 156
 157       case GL_ALPHA12:
 158       case GL_ALPHA16:
 159          RETURN_IF_SUPPORTED(MESA_FORMAT_A16);
 160          RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
 161          break;
 162
 163       /* Luminance formats */
 164       case 1:
 165       case GL_LUMINANCE:
 166       case GL_LUMINANCE4:
 167       case GL_LUMINANCE8:
 168          RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
 169          break;
 170
 171       case GL_LUMINANCE12:
 172       case GL_LUMINANCE16:
 173          RETURN_IF_SUPPORTED(MESA_FORMAT_L16);
 174          RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
 175          break;
 176
 177       /* Luminance/Alpha formats */
 178       case GL_LUMINANCE4_ALPHA4:
 179          RETURN_IF_SUPPORTED(MESA_FORMAT_AL44);
 180          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 181          break;
 182
 183       case 2:
 184       case GL_LUMINANCE_ALPHA:
 185       case GL_LUMINANCE6_ALPHA2:
 186       case GL_LUMINANCE8_ALPHA8:
 187          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 188          break;
 189
 190       case GL_LUMINANCE12_ALPHA4:
 191       case GL_LUMINANCE12_ALPHA12:
 192       case GL_LUMINANCE16_ALPHA16:
 193          RETURN_IF_SUPPORTED(MESA_FORMAT_AL1616);
 194          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 195          break;
 196
 197       case GL_INTENSITY:
 198       case GL_INTENSITY4:
 199       case GL_INTENSITY8:
 200          RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
 201          break;
 202
 203       case GL_INTENSITY12:
 204       case GL_INTENSITY16:
 205          RETURN_IF_SUPPORTED(MESA_FORMAT_I16);
 206          RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
 207          break;
 208
 209       default:
 210          ; /* fallthrough */
 211    }
 212
 213    if (ctx->Extensions.ARB_depth_texture) {
 214       switch (internalFormat) {
 215          case GL_DEPTH_COMPONENT:
 216          case GL_DEPTH_COMPONENT24:
 217          case GL_DEPTH_COMPONENT32:
 218             RETURN_IF_SUPPORTED(MESA_FORMAT_Z32);
 219             RETURN_IF_SUPPORTED(MESA_FORMAT_X8_Z24);
 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_X8_Z24);
 225             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 226          default:
 227             ; /* fallthrough */
 228       }
 229    }
 230
 231    switch (internalFormat) {
 232       case GL_COMPRESSED_ALPHA_ARB:
 233          RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
 234          break;
 235       case GL_COMPRESSED_LUMINANCE_ARB:
 236          RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
 237          break;
 238       case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
 239          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 240          break;
 241       case GL_COMPRESSED_INTENSITY_ARB:
 242          RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
 243          break;
 244       case GL_COMPRESSED_RGB_ARB:
 245          /* We don't use texture compression for 1D and 1D array textures.
 246           * For 1D textures, compressions doesn't buy us much.
 247           * For 1D ARRAY textures, there's complicated issues with updating
 248           * sub-regions on non-block boundaries with glCopyTexSubImage, among
 249           * other issues.  FWIW, the GL_EXT_texture_array extension prohibits
 250           * 1D ARRAY textures in S3TC format.
 251           */
 252          if (target != GL_TEXTURE_1D && target != GL_TEXTURE_1D_ARRAY) {
 253             if (ctx->Extensions.EXT_texture_compression_s3tc ||
 254                 ctx->Extensions.ANGLE_texture_compression_dxt)
 255                RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 256             if (ctx->Extensions.TDFX_texture_compression_FXT1)
 257                RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);
 258          }
 259          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
 260          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 261          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 262          break;
 263       case GL_COMPRESSED_RGBA_ARB:
 264          /* We don't use texture compression for 1D and 1D array textures. */
 265          if (target != GL_TEXTURE_1D && target != GL_TEXTURE_1D_ARRAY) {
 266             if (ctx->Extensions.EXT_texture_compression_s3tc ||
 267                 ctx->Extensions.ANGLE_texture_compression_dxt)
 268                RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3); /* Not rgba_dxt1, see spec */
 269             if (ctx->Extensions.TDFX_texture_compression_FXT1)
 270                RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);
 271          }
 272          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
 273          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 274          break;
 275       default:
 276          ; /* fallthrough */
 277    }
 278
 279    if (ctx->Extensions.ARB_ES2_compatibility) {
 280       switch (internalFormat) {
 281          case GL_RGB565:
 282             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);
 283             break;
 284          default:
 285          ; /* fallthrough */
 286       }
 287    }
 288
 289    if (ctx->Extensions.MESA_ycbcr_texture) {
 290       if (internalFormat == GL_YCBCR_MESA) {
 291          if (type == GL_UNSIGNED_SHORT_8_8_MESA)
 292             RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR);
 293          else
 294             RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR_REV);
 295       }
 296    }
 297
 298    /* For non-generic compressed format we assert two things:
 299     *
 300     * 1. The format has already been validated against the set of available
 301     *    extensions.
 302     *
 303     * 2. The driver only enables the extension if it supports all of the
 304     *    formats that are part of that extension.
 305     */
 306    switch (internalFormat) {
 307    case GL_COMPRESSED_RGB_FXT1_3DFX:
 308       return MESA_FORMAT_RGB_FXT1;
 309    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 310       return MESA_FORMAT_RGBA_FXT1;
 311    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 312    case GL_RGB_S3TC:
 313    case GL_RGB4_S3TC:
 314       return MESA_FORMAT_RGB_DXT1;
 315    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 316       return MESA_FORMAT_RGBA_DXT1;
 317    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 318    case GL_RGBA_S3TC:
 319    case GL_RGBA4_S3TC:
 320       return MESA_FORMAT_RGBA_DXT3;
 321    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 322       return MESA_FORMAT_RGBA_DXT5;
 323    case GL_COMPRESSED_RED_RGTC1:
 324       return MESA_FORMAT_RED_RGTC1;
 325    case GL_COMPRESSED_SIGNED_RED_RGTC1:
 326       return MESA_FORMAT_SIGNED_RED_RGTC1;
 327    case GL_COMPRESSED_RG_RGTC2:
 328       return MESA_FORMAT_RG_RGTC2;
 329    case GL_COMPRESSED_SIGNED_RG_RGTC2:
 330       return MESA_FORMAT_SIGNED_RG_RGTC2;
 331    case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
 332       return MESA_FORMAT_L_LATC1;
 333    case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
 334       return MESA_FORMAT_SIGNED_L_LATC1;
 335    case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
 336       return MESA_FORMAT_LA_LATC2;
 337    case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
 338       return MESA_FORMAT_SIGNED_LA_LATC2;
 339    case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
 340       return MESA_FORMAT_LA_LATC2;
 341    case GL_ETC1_RGB8_OES:
 342       return MESA_FORMAT_ETC1_RGB8;
 343    case GL_COMPRESSED_RGB8_ETC2:
 344       return MESA_FORMAT_ETC2_RGB8;
 345    case GL_COMPRESSED_SRGB8_ETC2:
 346       return MESA_FORMAT_ETC2_SRGB8;
 347    case GL_COMPRESSED_RGBA8_ETC2_EAC:
 348       return MESA_FORMAT_ETC2_RGBA8_EAC;
 349    case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:
 350       return MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC;
 351    case GL_COMPRESSED_R11_EAC:
 352       return MESA_FORMAT_ETC2_R11_EAC;
 353    case GL_COMPRESSED_RG11_EAC:
 354       return MESA_FORMAT_ETC2_RG11_EAC;
 355    case GL_COMPRESSED_SIGNED_R11_EAC:
 356       return MESA_FORMAT_ETC2_SIGNED_R11_EAC;
 357    case GL_COMPRESSED_SIGNED_RG11_EAC:
 358       return MESA_FORMAT_ETC2_SIGNED_RG11_EAC;
 359    case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
 360       return MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1;
 361    case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:
 362       return MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1;
 363    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 364       return MESA_FORMAT_SRGB_DXT1;
 365    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 366       return MESA_FORMAT_SRGBA_DXT1;
 367    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 368       return MESA_FORMAT_SRGBA_DXT3;
 369    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 370       return MESA_FORMAT_SRGBA_DXT5;
 371    default:
 372       ; /* fallthrough */
 373    }
 374
 375    if (ctx->Extensions.ARB_texture_float) {
 376       switch (internalFormat) {
 377          case GL_ALPHA16F_ARB:
 378             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT16);
 379             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
 380             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 381             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 382             break;
 383          case GL_ALPHA32F_ARB:
 384             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
 385             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 386             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT16);
 387             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 388             break;
 389          case GL_LUMINANCE16F_ARB:
 390             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT16);
 391             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
 392             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 393             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 394             break;
 395          case GL_LUMINANCE32F_ARB:
 396             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
 397             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 398             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT16);
 399             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 400             break;
 401          case GL_LUMINANCE_ALPHA16F_ARB:
 402             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16);
 403             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
 404             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 405             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 406             break;
 407          case GL_LUMINANCE_ALPHA32F_ARB:
 408             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
 409             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 410             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16);
 411             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 412             break;
 413          case GL_INTENSITY16F_ARB:
 414             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT16);
 415             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
 416             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 417             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 418             break;
 419          case GL_INTENSITY32F_ARB:
 420             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
 421             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 422             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT16);
 423             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 424             break;
 425          case GL_RGB16F_ARB:
 426             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT16);
 427             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 428             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
 429             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 430             break;
 431          case GL_RGB32F_ARB:
 432             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
 433             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 434             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT16);
 435             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 436             break;
 437          case GL_RGBA16F_ARB:
 438             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 439             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 440             break;
 441          case GL_RGBA32F_ARB:
 442             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 443             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 444             break;
 445          default:
 446             ; /* fallthrough */
 447       }
 448    }
 449
 450    if (ctx->Extensions.EXT_texture_shared_exponent) {
 451       switch (internalFormat) {
 452          case GL_RGB9_E5:
 453             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_RGB9_E5_FLOAT]);
 454             return MESA_FORMAT_RGB9_E5_FLOAT;
 455          default:
 456             ; /* fallthrough */
 457       }
 458    }
 459
 460    if (ctx->Extensions.EXT_packed_float) {
 461       switch (internalFormat) {
 462          case GL_R11F_G11F_B10F:
 463             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_R11_G11_B10_FLOAT]);
 464             return MESA_FORMAT_R11_G11_B10_FLOAT;
 465          default:
 466             ; /* fallthrough */
 467       }
 468    }
 469
 470    if (ctx->Extensions.EXT_packed_depth_stencil) {
 471       switch (internalFormat) {
 472          case GL_DEPTH_STENCIL_EXT:
 473          case GL_DEPTH24_STENCIL8_EXT:
 474             RETURN_IF_SUPPORTED(MESA_FORMAT_Z24_S8);
 475             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 476             break;
 477          default:
 478             ; /* fallthrough */
 479       }
 480    }
 481
 482    if (ctx->Extensions.ARB_depth_buffer_float) {
 483       switch (internalFormat) {
 484          case GL_DEPTH_COMPONENT32F:
 485             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_Z32_FLOAT]);
 486             return MESA_FORMAT_Z32_FLOAT;
 487          case GL_DEPTH32F_STENCIL8:
 488             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_Z32_FLOAT_X24S8]);
 489             return MESA_FORMAT_Z32_FLOAT_X24S8;
 490          default:
 491             ; /* fallthrough */
 492       }
 493    }
 494
 495    if (ctx->Extensions.ATI_envmap_bumpmap) {
 496       switch (internalFormat) {
 497          case GL_DUDV_ATI:
 498          case GL_DU8DV8_ATI:
 499             RETURN_IF_SUPPORTED(MESA_FORMAT_DUDV8);
 500             break;
 501          default:
 502             ; /* fallthrough */
 503       }
 504    }
 505
 506    if (ctx->Extensions.EXT_texture_snorm) {
 507       switch (internalFormat) {
 508          case GL_RED_SNORM:
 509          case GL_R8_SNORM:
 510             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R8);
 511             break;
 512          case GL_RG_SNORM:
 513          case GL_RG8_SNORM:
 514             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG88_REV);
 515             break;
 516          case GL_RGB_SNORM:
 517          case GL_RGB8_SNORM:
 518             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 519             /* FALLTHROUGH */
 520          case GL_RGBA_SNORM:
 521          case GL_RGBA8_SNORM:
 522             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 523             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 524             break;
 525          case GL_ALPHA_SNORM:
 526          case GL_ALPHA8_SNORM:
 527             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A8);
 528             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 529             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 530             break;
 531          case GL_LUMINANCE_SNORM:
 532          case GL_LUMINANCE8_SNORM:
 533             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L8);
 534             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 535             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 536             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 537             break;
 538          case GL_LUMINANCE_ALPHA_SNORM:
 539          case GL_LUMINANCE8_ALPHA8_SNORM:
 540             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL88);
 541             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 542             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 543             break;
 544          case GL_INTENSITY_SNORM:
 545          case GL_INTENSITY8_SNORM:
 546             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I8);
 547             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 548             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 549             break;
 550          case GL_R16_SNORM:
 551             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R16);
 552             break;
 553          case GL_RG16_SNORM:
 554             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_GR1616);
 555             break;
 556          case GL_RGB16_SNORM:
 557             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGB_16);
 558             /* FALLTHROUGH */
 559          case GL_RGBA16_SNORM:
 560             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 561             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 562             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 563             break;
 564          case GL_ALPHA16_SNORM:
 565             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A16);
 566             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 567             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 568             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 569             break;
 570          case GL_LUMINANCE16_SNORM:
 571             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L16);
 572             /* FALLTHROUGH */
 573          case GL_LUMINANCE16_ALPHA16_SNORM:
 574             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL1616);
 575             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 576             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 577             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 578             break;
 579          case GL_INTENSITY16_SNORM:
 580             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I16);
 581             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 582             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 583             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 584             break;
 585          default:
 586             ; /* fall-through */
 587       }
 588    }
 589
 590    if (ctx->Extensions.EXT_texture_sRGB) {
 591       switch (internalFormat) {
 592          case GL_SRGB_EXT:
 593          case GL_SRGB8_EXT:
 594             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 595             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 596             break;
 597          case GL_SRGB_ALPHA_EXT:
 598          case GL_SRGB8_ALPHA8_EXT:
 599             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 600             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 601             break;
 602          case GL_SLUMINANCE_EXT:
 603          case GL_SLUMINANCE8_EXT:
 604             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 605             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 606             break;
 607          case GL_SLUMINANCE_ALPHA_EXT:
 608          case GL_SLUMINANCE8_ALPHA8_EXT:
 609             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 610             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 611             break;
 612          case GL_COMPRESSED_SLUMINANCE_EXT:
 613             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 614             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 615             break;
 616          case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 617             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 618             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 619             break;
 620          case GL_COMPRESSED_SRGB_EXT:
 621             if (ctx->Extensions.EXT_texture_compression_s3tc)
 622                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
 623             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 624             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 625             break;
 626          case GL_COMPRESSED_SRGB_ALPHA_EXT:
 627             if (ctx->Extensions.EXT_texture_compression_s3tc)
 628                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3); /* Not srgba_dxt1, see spec */
 629             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 630             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 631             break;
 632          default:
 633             ; /* fallthrough */
 634       }
 635    }
 636
 637    if (ctx->Extensions.EXT_texture_integer) {
 638       switch (internalFormat) {
 639       case GL_ALPHA8UI_EXT:
 640          RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_UINT8);
 641          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 642          break;
 643       case GL_ALPHA16UI_EXT:
 644          RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_UINT16);
 645          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 646          break;
 647       case GL_ALPHA32UI_EXT:
 648          RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_UINT32);
 649          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 650          break;
 651       case GL_ALPHA8I_EXT:
 652          RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_INT8);
 653          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 654          break;
 655       case GL_ALPHA16I_EXT:
 656          RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_INT16);
 657          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 658          break;
 659       case GL_ALPHA32I_EXT:
 660          RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_INT32);
 661          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 662          break;
 663       case GL_LUMINANCE8UI_EXT:
 664          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_UINT8);
 665          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 666          break;
 667       case GL_LUMINANCE16UI_EXT:
 668          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_UINT16);
 669          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 670          break;
 671       case GL_LUMINANCE32UI_EXT:
 672          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_UINT32);
 673          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 674          break;
 675       case GL_LUMINANCE8I_EXT:
 676          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_INT8);
 677          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 678          break;
 679       case GL_LUMINANCE16I_EXT:
 680          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_INT16);
 681          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 682          break;
 683       case GL_LUMINANCE32I_EXT:
 684          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_INT32);
 685          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 686          break;
 687       case GL_LUMINANCE_ALPHA8UI_EXT:
 688          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_UINT8);
 689          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 690          break;
 691       case GL_LUMINANCE_ALPHA16UI_EXT:
 692          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_UINT16);
 693          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 694          break;
 695       case GL_LUMINANCE_ALPHA32UI_EXT:
 696          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_UINT32);
 697          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 698          break;
 699       case GL_LUMINANCE_ALPHA8I_EXT:
 700          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_INT8);
 701          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 702          break;
 703       case GL_LUMINANCE_ALPHA16I_EXT:
 704          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_INT16);
 705          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 706          break;
 707       case GL_LUMINANCE_ALPHA32I_EXT:
 708          RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_INT32);
 709          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 710          break;
 711       case GL_INTENSITY8UI_EXT:
 712          RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_UINT8);
 713          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 714          break;
 715       case GL_INTENSITY16UI_EXT:
 716          RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_UINT16);
 717          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 718          break;
 719       case GL_INTENSITY32UI_EXT:
 720          RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_UINT32);
 721          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 722          break;
 723       case GL_INTENSITY8I_EXT:
 724          RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_INT8);
 725          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 726          break;
 727       case GL_INTENSITY16I_EXT:
 728          RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_INT16);
 729          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 730          break;
 731       case GL_INTENSITY32I_EXT:
 732          RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_INT32);
 733          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 734          break;
 735       }
 736    }
 737
 738    if (ctx->Version >= 30 ||
 739        ctx->Extensions.EXT_texture_integer) {
 740       switch (internalFormat) {
 741       case GL_RGB8UI_EXT:
 742          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_UINT8);
 743          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 744          break;
 745       case GL_RGB16UI_EXT:
 746          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_UINT16);
 747          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 748          break;
 749       case GL_RGB32UI_EXT:
 750          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_UINT32);
 751          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 752          break;
 753       case GL_RGB8I_EXT:
 754          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_INT8);
 755          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 756          break;
 757       case GL_RGB16I_EXT:
 758          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_INT16);
 759          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 760          break;
 761       case GL_RGB32I_EXT:
 762          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_INT32);
 763          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 764          break;
 765       case GL_RGBA8UI_EXT:
 766          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 767          break;
 768       case GL_RGBA16UI_EXT:
 769          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 770          break;
 771       case GL_RGBA32UI_EXT:
 772          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 773          break;
 774       case GL_RGBA8I_EXT:
 775          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 776          break;
 777       case GL_RGBA16I_EXT:
 778          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 779          break;
 780       case GL_RGBA32I_EXT:
 781          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 782          break;
 783       }
 784    }
 785
 786    if (ctx->Extensions.ARB_texture_rg) {
 787       switch (internalFormat) {
 788       case GL_R8:
 789       case GL_RED:
 790          RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
 791          break;
 792
 793       case GL_COMPRESSED_RED:
 794          if (target != GL_TEXTURE_1D && target != GL_TEXTURE_1D_ARRAY)
 795             RETURN_IF_SUPPORTED(MESA_FORMAT_RED_RGTC1);
 796          RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
 797          break;
 798
 799       case GL_R16:
 800          RETURN_IF_SUPPORTED(MESA_FORMAT_R16);
 801          break;
 802
 803       case GL_RG:
 804       case GL_RG8:
 805          RETURN_IF_SUPPORTED(MESA_FORMAT_GR88);
 806          break;
 807
 808       case GL_COMPRESSED_RG:
 809          if (target != GL_TEXTURE_1D && target != GL_TEXTURE_1D_ARRAY)
 810             RETURN_IF_SUPPORTED(MESA_FORMAT_RG_RGTC2);
 811          RETURN_IF_SUPPORTED(MESA_FORMAT_GR88);
 812          break;
 813
 814       case GL_RG16:
 815          RETURN_IF_SUPPORTED(MESA_FORMAT_GR1616);
 816          break;
 817
 818       default:
 819          ; /* fallthrough */
 820       }
 821    }
 822
 823    if (ctx->Extensions.ARB_texture_rg && ctx->Extensions.ARB_texture_float) {
 824       switch (internalFormat) {
 825       case GL_R16F:
 826          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT16);
 827          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT16);
 828          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT32);
 829          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 830          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 831          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 832          break;
 833       case GL_R32F:
 834          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT32);
 835          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 836          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 837          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT16);
 838          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT16);
 839          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 840          break;
 841       case GL_RG16F:
 842          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT16);
 843          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 844          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 845          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 846          break;
 847       case GL_RG32F:
 848          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 849          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 850          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT16);
 851          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 852          break;
 853
 854       default:
 855          ; /* fallthrough */
 856       }
 857    }
 858
 859    if (ctx->Version >= 30 ||
 860        (ctx->Extensions.ARB_texture_rg &&
 861         ctx->Extensions.EXT_texture_integer)) {
 862       switch (internalFormat) {
 863       case GL_R8UI:
 864          RETURN_IF_SUPPORTED(MESA_FORMAT_R_UINT8);
 865          break;
 866       case GL_RG8UI:
 867          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_UINT8);
 868          break;
 869       case GL_R16UI:
 870          RETURN_IF_SUPPORTED(MESA_FORMAT_R_UINT16);
 871          break;
 872       case GL_RG16UI:
 873          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_UINT16);
 874          break;
 875       case GL_R32UI:
 876          RETURN_IF_SUPPORTED(MESA_FORMAT_R_UINT32);
 877          break;
 878       case GL_RG32UI:
 879          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_UINT32);
 880          break;
 881       case GL_R8I:
 882          RETURN_IF_SUPPORTED(MESA_FORMAT_R_INT8);
 883          break;
 884       case GL_RG8I:
 885          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_INT8);
 886          break;
 887       case GL_R16I:
 888          RETURN_IF_SUPPORTED(MESA_FORMAT_R_INT16);
 889          break;
 890       case GL_RG16I:
 891          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_INT16);
 892          break;
 893       case GL_R32I:
 894          RETURN_IF_SUPPORTED(MESA_FORMAT_R_INT32);
 895          break;
 896       case GL_RG32I:
 897          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_INT32);
 898          break;
 899       default:
 900          break;
 901       }
 902    }
 903
 904    if (ctx->Extensions.ARB_texture_rgb10_a2ui) {
 905       switch (internalFormat) {
 906       case GL_RGB10_A2UI:
 907          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB2101010_UINT);
 908          RETURN_IF_SUPPORTED(MESA_FORMAT_ABGR2101010_UINT);
 909          break;
 910       default:
 911          break;
 912       }
 913    }
 914    /* GL_BGRA can be an internal format *only* in OpenGL ES (1.x or 2.0).
 915     */
 916    if (_mesa_is_gles(ctx)) {
 917       switch (internalFormat) {
 918       case GL_BGRA:
 919          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 920          break;
 921
 922       default:
 923          ; /* fallthrough */
 924       }
 925    }
 926
 927    _mesa_problem(ctx, "unexpected format %s in _mesa_choose_tex_format()",
 928                  _mesa_lookup_enum_by_nr(internalFormat));
 929    return MESA_FORMAT_NONE;
 930 }
 931