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       default:
 208          ; /* fallthrough */
 209    }
 210
 211    if (ctx->Extensions.ARB_depth_texture) {
 212       switch (internalFormat) {
 213          case GL_DEPTH_COMPONENT:
 214          case GL_DEPTH_COMPONENT24:
 215          case GL_DEPTH_COMPONENT32:
 216             RETURN_IF_SUPPORTED(MESA_FORMAT_Z32);
 217             RETURN_IF_SUPPORTED(MESA_FORMAT_X8_Z24);
 218             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 219             break;
 220          case GL_DEPTH_COMPONENT16:
 221             RETURN_IF_SUPPORTED(MESA_FORMAT_Z16);
 222             RETURN_IF_SUPPORTED(MESA_FORMAT_X8_Z24);
 223             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 224          default:
 225             ; /* fallthrough */
 226       }
 227    }
 228
 229    switch (internalFormat) {
 230       case GL_COMPRESSED_ALPHA_ARB:
 231          RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
 232          break;
 233       case GL_COMPRESSED_LUMINANCE_ARB:
 234          RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
 235          break;
 236       case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
 237          RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
 238          break;
 239       case GL_COMPRESSED_INTENSITY_ARB:
 240          RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
 241          break;
 242       case GL_COMPRESSED_RGB_ARB:
 243          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 244              ctx->Extensions.S3_s3tc)
 245             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 246          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 247             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);
 248          RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
 249          RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
 250          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 251          break;
 252       case GL_COMPRESSED_RGBA_ARB:
 253          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 254              ctx->Extensions.S3_s3tc)
 255             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3); /* Not rgba_dxt1, see spec */
 256          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 257             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);
 258          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
 259          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 260          break;
 261       default:
 262          ; /* fallthrough */
 263    }
 264
 265    if (ctx->Extensions.MESA_ycbcr_texture) {
 266       if (internalFormat == GL_YCBCR_MESA) {
 267          if (type == GL_UNSIGNED_SHORT_8_8_MESA)
 268             RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR);
 269          else
 270             RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR_REV);
 271       }
 272    }
 273
 274 #if FEATURE_texture_fxt1
 275    if (ctx->Extensions.TDFX_texture_compression_FXT1) {
 276       switch (internalFormat) {
 277          case GL_COMPRESSED_RGB_FXT1_3DFX:
 278             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);
 279          break;
 280          case GL_COMPRESSED_RGBA_FXT1_3DFX:
 281             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);
 282          break;
 283          default:
 284             ; /* fallthrough */
 285       }
 286    }
 287 #endif
 288
 289 #if FEATURE_texture_s3tc
 290    if (ctx->Extensions.EXT_texture_compression_s3tc) {
 291       switch (internalFormat) {
 292          case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 293             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 294             break;
 295          case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 296             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT1);
 297             break;
 298          case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 299             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);
 300             break;
 301          case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 302             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT5);
 303             break;
 304          default:
 305             ; /* fallthrough */
 306       }
 307    }
 308
 309    if (ctx->Extensions.S3_s3tc) {
 310       switch (internalFormat) {
 311          case GL_RGB_S3TC:
 312          case GL_RGB4_S3TC:
 313             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
 314             break;
 315          case GL_RGBA_S3TC:
 316          case GL_RGBA4_S3TC:
 317             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);
 318             break;
 319          default:
 320             ; /* fallthrough */
 321       }
 322    }
 323 #endif
 324
 325    if (ctx->Extensions.ARB_texture_float) {
 326       switch (internalFormat) {
 327          case GL_ALPHA16F_ARB:
 328             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT16);
 329             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
 330             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 331             break;
 332          case GL_ALPHA32F_ARB:
 333             RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
 334             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 335             break;
 336          case GL_LUMINANCE16F_ARB:
 337             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT16);
 338             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
 339             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 340             break;
 341          case GL_LUMINANCE32F_ARB:
 342             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
 343             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 344             break;
 345          case GL_LUMINANCE_ALPHA16F_ARB:
 346             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16);
 347             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
 348             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 349             break;
 350          case GL_LUMINANCE_ALPHA32F_ARB:
 351             RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
 352             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 353             break;
 354          case GL_INTENSITY16F_ARB:
 355             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT16);
 356             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
 357             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 358             break;
 359          case GL_INTENSITY32F_ARB:
 360             RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
 361             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 362             break;
 363          case GL_RGB16F_ARB:
 364             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT16);
 365             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
 366             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 367             break;
 368          case GL_RGB32F_ARB:
 369             RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
 370             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 371             break;
 372          case GL_RGBA16F_ARB:
 373             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
 374             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 375             break;
 376          case GL_RGBA32F_ARB:
 377             RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 378             break;
 379          default:
 380             ; /* fallthrough */
 381       }
 382    }
 383
 384    if (ctx->Extensions.EXT_texture_shared_exponent) {
 385       switch (internalFormat) {
 386          case GL_RGB9_E5:
 387             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_RGB9_E5_FLOAT]);
 388             return MESA_FORMAT_RGB9_E5_FLOAT;
 389          default:
 390             ; /* fallthrough */
 391       }
 392    }
 393
 394    if (ctx->Extensions.EXT_packed_float) {
 395       switch (internalFormat) {
 396          case GL_R11F_G11F_B10F:
 397             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_R11_G11_B10_FLOAT]);
 398             return MESA_FORMAT_R11_G11_B10_FLOAT;
 399          default:
 400             ; /* fallthrough */
 401       }
 402    }
 403
 404    if (ctx->Extensions.EXT_packed_depth_stencil) {
 405       switch (internalFormat) {
 406          case GL_DEPTH_STENCIL_EXT:
 407          case GL_DEPTH24_STENCIL8_EXT:
 408             RETURN_IF_SUPPORTED(MESA_FORMAT_Z24_S8);
 409             RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
 410             break;
 411          default:
 412             ; /* fallthrough */
 413       }
 414    }
 415
 416    if (ctx->Extensions.ARB_depth_buffer_float) {
 417       switch (internalFormat) {
 418          case GL_DEPTH_COMPONENT32F:
 419             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_Z32_FLOAT]);
 420             return MESA_FORMAT_Z32_FLOAT;
 421          case GL_DEPTH32F_STENCIL8:
 422             ASSERT(ctx->TextureFormatSupported[MESA_FORMAT_Z32_FLOAT_X24S8]);
 423             return MESA_FORMAT_Z32_FLOAT_X24S8;
 424          default:
 425             ; /* fallthrough */
 426       }
 427    }
 428
 429    if (ctx->Extensions.ATI_envmap_bumpmap) {
 430       switch (internalFormat) {
 431          case GL_DUDV_ATI:
 432          case GL_DU8DV8_ATI:
 433             RETURN_IF_SUPPORTED(MESA_FORMAT_DUDV8);
 434             break;
 435          default:
 436             ; /* fallthrough */
 437       }
 438    }
 439
 440    if (ctx->Extensions.EXT_texture_snorm) {
 441       switch (internalFormat) {
 442          case GL_RED_SNORM:
 443          case GL_R8_SNORM:
 444             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R8);
 445             break;
 446          case GL_RG_SNORM:
 447          case GL_RG8_SNORM:
 448             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG88_REV);
 449             break;
 450          case GL_RGB_SNORM:
 451          case GL_RGB8_SNORM:
 452             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 453             /* FALLTHROUGH */
 454          case GL_RGBA_SNORM:
 455          case GL_RGBA8_SNORM:
 456             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 457             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 458             break;
 459          case GL_ALPHA_SNORM:
 460          case GL_ALPHA8_SNORM:
 461             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A8);
 462             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 463             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 464             break;
 465          case GL_LUMINANCE_SNORM:
 466          case GL_LUMINANCE8_SNORM:
 467             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L8);
 468             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
 469             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 470             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 471             break;
 472          case GL_LUMINANCE_ALPHA_SNORM:
 473          case GL_LUMINANCE8_ALPHA8_SNORM:
 474             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL88);
 475             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 476             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 477             break;
 478          case GL_INTENSITY_SNORM:
 479          case GL_INTENSITY8_SNORM:
 480             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I8);
 481             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 482             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 483             break;
 484          case GL_R16_SNORM:
 485             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R16);
 486             break;
 487          case GL_RG16_SNORM:
 488             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_GR1616);
 489             break;
 490          case GL_RGB16_SNORM:
 491             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGB_16);
 492             /* FALLTHROUGH */
 493          case GL_RGBA16_SNORM:
 494             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 495             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 496             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 497             break;
 498          case GL_ALPHA16_SNORM:
 499             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_A16);
 500             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 501             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 502             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 503             break;
 504          case GL_LUMINANCE16_SNORM:
 505             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L16);
 506             /* FALLTHROUGH */
 507          case GL_LUMINANCE16_ALPHA16_SNORM:
 508             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_AL1616);
 509             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 510             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 511             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 512             break;
 513          case GL_INTENSITY16_SNORM:
 514             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_I16);
 515             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
 516             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
 517             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
 518             break;
 519          default:
 520             ; /* fall-through */
 521       }
 522    }
 523
 524 #if FEATURE_EXT_texture_sRGB
 525    if (ctx->Extensions.EXT_texture_sRGB) {
 526       switch (internalFormat) {
 527          case GL_SRGB_EXT:
 528          case GL_SRGB8_EXT:
 529             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 530             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 531             break;
 532          case GL_SRGB_ALPHA_EXT:
 533          case GL_SRGB8_ALPHA8_EXT:
 534             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 535             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 536             break;
 537          case GL_SLUMINANCE_EXT:
 538          case GL_SLUMINANCE8_EXT:
 539             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 540             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 541             break;
 542          case GL_SLUMINANCE_ALPHA_EXT:
 543          case GL_SLUMINANCE8_ALPHA8_EXT:
 544             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 545             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 546             break;
 547          case GL_COMPRESSED_SLUMINANCE_EXT:
 548             RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
 549             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 550             break;
 551          case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 552             RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
 553             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 554             break;
 555          case GL_COMPRESSED_SRGB_EXT:
 556 #if FEATURE_texture_s3tc
 557             if (ctx->Extensions.EXT_texture_compression_s3tc)
 558                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
 559 #endif
 560             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
 561             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 562             break;
 563          case GL_COMPRESSED_SRGB_ALPHA_EXT:
 564 #if FEATURE_texture_s3tc
 565             if (ctx->Extensions.EXT_texture_compression_s3tc)
 566                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3); /* Not srgba_dxt1, see spec */
 567 #endif
 568             RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
 569             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 570             break;
 571 #if FEATURE_texture_s3tc
 572          case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 573             if (ctx->Extensions.EXT_texture_compression_s3tc)
 574                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
 575             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 576             break;
 577          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 578             if (ctx->Extensions.EXT_texture_compression_s3tc)
 579                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT1);
 580             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 581             break;
 582          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 583             if (ctx->Extensions.EXT_texture_compression_s3tc)
 584                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3);
 585             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 586             break;
 587          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 588             if (ctx->Extensions.EXT_texture_compression_s3tc)
 589                RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT5);
 590             RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
 591             break;
 592 #endif
 593          default:
 594             ; /* fallthrough */
 595       }
 596    }
 597 #endif /* FEATURE_EXT_texture_sRGB */
 598
 599    if (ctx->Extensions.EXT_texture_integer) {
 600       switch (internalFormat) {
 601       case GL_RGBA32UI_EXT:
 602       case GL_RGB32UI_EXT:
 603       case GL_ALPHA32UI_EXT:
 604       case GL_INTENSITY32UI_EXT:
 605       case GL_LUMINANCE32UI_EXT:
 606       case GL_LUMINANCE_ALPHA32UI_EXT:
 607          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
 608          break;
 609       case GL_RGBA16UI_EXT:
 610       case GL_RGB16UI_EXT:
 611       case GL_ALPHA16UI_EXT:
 612       case GL_INTENSITY16UI_EXT:
 613       case GL_LUMINANCE16UI_EXT:
 614       case GL_LUMINANCE_ALPHA16UI_EXT:
 615          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
 616          break;
 617       case GL_RGBA8UI_EXT:
 618       case GL_RGB8UI_EXT:
 619       case GL_ALPHA8UI_EXT:
 620       case GL_INTENSITY8UI_EXT:
 621       case GL_LUMINANCE8UI_EXT:
 622       case GL_LUMINANCE_ALPHA8UI_EXT:
 623          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
 624          break;
 625       case GL_RGBA32I_EXT:
 626       case GL_RGB32I_EXT:
 627       case GL_ALPHA32I_EXT:
 628       case GL_INTENSITY32I_EXT:
 629       case GL_LUMINANCE32I_EXT:
 630       case GL_LUMINANCE_ALPHA32I_EXT:
 631          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
 632          break;
 633       case GL_RGBA16I_EXT:
 634       case GL_RGB16I_EXT:
 635       case GL_ALPHA16I_EXT:
 636       case GL_INTENSITY16I_EXT:
 637       case GL_LUMINANCE16I_EXT:
 638       case GL_LUMINANCE_ALPHA16I_EXT:
 639          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
 640          break;
 641       case GL_RGBA8I_EXT:
 642       case GL_RGB8I_EXT:
 643       case GL_ALPHA8I_EXT:
 644       case GL_INTENSITY8I_EXT:
 645       case GL_LUMINANCE8I_EXT:
 646       case GL_LUMINANCE_ALPHA8I_EXT:
 647          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
 648          break;
 649       }
 650    }
 651
 652    if (ctx->Extensions.ARB_texture_rg) {
 653       switch (internalFormat) {
 654       case GL_R8:
 655       case GL_RED:
 656          RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
 657          break;
 658
 659       case GL_COMPRESSED_RED:
 660          RETURN_IF_SUPPORTED(MESA_FORMAT_RED_RGTC1);
 661          RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
 662          break;
 663
 664       case GL_R16:
 665          RETURN_IF_SUPPORTED(MESA_FORMAT_R16);
 666          break;
 667
 668       case GL_RG:
 669       case GL_RG8:
 670          RETURN_IF_SUPPORTED(MESA_FORMAT_RG88);
 671          break;
 672
 673       case GL_COMPRESSED_RG:
 674          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_RGTC2);
 675          RETURN_IF_SUPPORTED(MESA_FORMAT_RG88);
 676          break;
 677
 678       case GL_RG16:
 679          RETURN_IF_SUPPORTED(MESA_FORMAT_RG1616);
 680          break;
 681
 682       default:
 683          ; /* fallthrough */
 684       }
 685    }
 686
 687    if (ctx->Extensions.ARB_texture_rg && ctx->Extensions.ARB_texture_float) {
 688       switch (internalFormat) {
 689       case GL_R16F:
 690          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT16);
 691          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT32);
 692          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 693          break;
 694       case GL_R32F:
 695          RETURN_IF_SUPPORTED(MESA_FORMAT_R_FLOAT32);
 696          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 697          break;
 698       case GL_RG16F:
 699          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT16);
 700          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 701          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 702          break;
 703       case GL_RG32F:
 704          RETURN_IF_SUPPORTED(MESA_FORMAT_RG_FLOAT32);
 705          RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
 706          break;
 707
 708       default:
 709          ; /* fallthrough */
 710       }
 711    }
 712
 713    if (ctx->Extensions.EXT_texture_format_BGRA8888) {
 714       switch (internalFormat) {
 715       case GL_BGRA:
 716          RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
 717          break;
 718
 719       default:
 720          ; /* fallthrough */
 721       }
 722    }
 723
 724    if (ctx->Extensions.ARB_texture_compression_rgtc) {
 725       switch (internalFormat) {
 726          case GL_COMPRESSED_RED_RGTC1:
 727             RETURN_IF_SUPPORTED(MESA_FORMAT_RED_RGTC1);
 728             break;
 729          case GL_COMPRESSED_SIGNED_RED_RGTC1:
 730             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RED_RGTC1);
 731             break;
 732          case GL_COMPRESSED_RG_RGTC2:
 733             RETURN_IF_SUPPORTED(MESA_FORMAT_RG_RGTC2);
 734             break;
 735          case GL_COMPRESSED_SIGNED_RG_RGTC2:
 736             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG_RGTC2);
 737             break;
 738          default:
 739             ; /* fallthrough */
 740       }
 741    }
 742
 743    if (ctx->Extensions.EXT_texture_compression_latc) {
 744       switch (internalFormat) {
 745          case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
 746             RETURN_IF_SUPPORTED(MESA_FORMAT_L_LATC1);
 747             break;
 748          case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
 749             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_L_LATC1);
 750             break;
 751          case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
 752             RETURN_IF_SUPPORTED(MESA_FORMAT_LA_LATC2);
 753             break;
 754          case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
 755             RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_LA_LATC2);
 756             break;
 757          default:
 758             ; /* fallthrough */
 759       }
 760    }
 761
 762    if (ctx->Extensions.ATI_texture_compression_3dc) {
 763       switch (internalFormat) {
 764          case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
 765             RETURN_IF_SUPPORTED(MESA_FORMAT_LA_LATC2);
 766             break;
 767          default:
 768             ; /* fallthrough */
 769       }
 770    }
 771
 772    _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
 773    return MESA_FORMAT_NONE;
 774 }
 775