src/mesa/state_tracker/st_format.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * Copyright (c) 2008-2010 VMware, Inc.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29
  30 /**
  31  * Mesa / Gallium format conversion and format selection code.
  32  * \author Brian Paul
  33  */
  34
  35 #include "main/imports.h"
  36 #include "main/context.h"
  37 #include "main/texstore.h"
  38 #include "main/enums.h"
  39 #include "main/macros.h"
  40
  41 #include "pipe/p_context.h"
  42 #include "pipe/p_defines.h"
  43 #include "pipe/p_screen.h"
  44 #include "util/u_format.h"
  45 #include "st_context.h"
  46 #include "st_format.h"
  47
  48
  49 static GLuint
  50 format_max_bits(enum pipe_format format)
  51 {
  52    GLuint size = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0);
  53
  54    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 1));
  55    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 2));
  56    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3));
  57    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0));
  58    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1));
  59    return size;
  60 }
  61
  62
  63 /**
  64  * Return basic GL datatype for the given gallium format.
  65  */
  66 GLenum
  67 st_format_datatype(enum pipe_format format)
  68 {
  69    const struct util_format_description *desc;
  70
  71    desc = util_format_description(format);
  72    assert(desc);
  73
  74    if (desc->layout == UTIL_FORMAT_LAYOUT_PLAIN) {
  75       if (format == PIPE_FORMAT_B5G5R5A1_UNORM ||
  76           format == PIPE_FORMAT_B5G6R5_UNORM) {
  77          return GL_UNSIGNED_SHORT;
  78       }
  79       else if (format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
  80                format == PIPE_FORMAT_S8_USCALED_Z24_UNORM) {
  81          return GL_UNSIGNED_INT_24_8;
  82       }
  83       else {
  84          const GLuint size = format_max_bits(format);
  85          if (size == 8) {
  86             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
  87                return GL_UNSIGNED_BYTE;
  88             else
  89                return GL_BYTE;
  90          }
  91          else if (size == 16) {
  92             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
  93                return GL_UNSIGNED_SHORT;
  94             else
  95                return GL_SHORT;
  96          }
  97          else {
  98             assert( size <= 32 );
  99             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
 100                return GL_UNSIGNED_INT;
 101             else
 102                return GL_INT;
 103          }
 104       }
 105    }
 106    else if (format == PIPE_FORMAT_UYVY) {
 107       return GL_UNSIGNED_SHORT;
 108    }
 109    else if (format == PIPE_FORMAT_YUYV) {
 110       return GL_UNSIGNED_SHORT;
 111    }
 112    else {
 113       /* compressed format? */
 114       assert(0);
 115    }
 116
 117    assert(0);
 118    return GL_NONE;
 119 }
 120
 121
 122 /**
 123  * Translate Mesa format to Gallium format.
 124  */
 125 enum pipe_format
 126 st_mesa_format_to_pipe_format(gl_format mesaFormat)
 127 {
 128    switch (mesaFormat) {
 129    case MESA_FORMAT_RGBA8888:
 130       return PIPE_FORMAT_A8B8G8R8_UNORM;
 131    case MESA_FORMAT_RGBA8888_REV:
 132       return PIPE_FORMAT_R8G8B8A8_UNORM;
 133    case MESA_FORMAT_ARGB8888:
 134       return PIPE_FORMAT_B8G8R8A8_UNORM;
 135    case MESA_FORMAT_ARGB8888_REV:
 136       return PIPE_FORMAT_A8R8G8B8_UNORM;
 137    case MESA_FORMAT_XRGB8888:
 138       return PIPE_FORMAT_B8G8R8X8_UNORM;
 139    case MESA_FORMAT_XRGB8888_REV:
 140       return PIPE_FORMAT_X8R8G8B8_UNORM;
 141    case MESA_FORMAT_ARGB1555:
 142       return PIPE_FORMAT_B5G5R5A1_UNORM;
 143    case MESA_FORMAT_ARGB4444:
 144       return PIPE_FORMAT_B4G4R4A4_UNORM;
 145    case MESA_FORMAT_RGB565:
 146       return PIPE_FORMAT_B5G6R5_UNORM;
 147    case MESA_FORMAT_AL88:
 148       return PIPE_FORMAT_L8A8_UNORM;
 149    case MESA_FORMAT_A8:
 150       return PIPE_FORMAT_A8_UNORM;
 151    case MESA_FORMAT_L8:
 152       return PIPE_FORMAT_L8_UNORM;
 153    case MESA_FORMAT_I8:
 154       return PIPE_FORMAT_I8_UNORM;
 155    case MESA_FORMAT_Z16:
 156       return PIPE_FORMAT_Z16_UNORM;
 157    case MESA_FORMAT_Z32:
 158       return PIPE_FORMAT_Z32_UNORM;
 159    case MESA_FORMAT_Z24_S8:
 160       return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 161    case MESA_FORMAT_S8_Z24:
 162       return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 163    case MESA_FORMAT_Z24_X8:
 164       return PIPE_FORMAT_X8Z24_UNORM;
 165    case MESA_FORMAT_X8_Z24:
 166       return PIPE_FORMAT_Z24X8_UNORM;
 167    case MESA_FORMAT_YCBCR:
 168       return PIPE_FORMAT_UYVY;
 169 #if FEATURE_texture_s3tc
 170    case MESA_FORMAT_RGB_DXT1:
 171       return PIPE_FORMAT_DXT1_RGB;
 172    case MESA_FORMAT_RGBA_DXT1:
 173       return PIPE_FORMAT_DXT1_RGBA;
 174    case MESA_FORMAT_RGBA_DXT3:
 175       return PIPE_FORMAT_DXT3_RGBA;
 176    case MESA_FORMAT_RGBA_DXT5:
 177       return PIPE_FORMAT_DXT5_RGBA;
 178 #if FEATURE_EXT_texture_sRGB
 179    case MESA_FORMAT_SRGB_DXT1:
 180       return PIPE_FORMAT_DXT1_SRGB;
 181    case MESA_FORMAT_SRGBA_DXT1:
 182       return PIPE_FORMAT_DXT1_SRGBA;
 183    case MESA_FORMAT_SRGBA_DXT3:
 184       return PIPE_FORMAT_DXT3_SRGBA;
 185    case MESA_FORMAT_SRGBA_DXT5:
 186       return PIPE_FORMAT_DXT5_SRGBA;
 187 #endif
 188 #endif
 189 #if FEATURE_EXT_texture_sRGB
 190    case MESA_FORMAT_SLA8:
 191       return PIPE_FORMAT_L8A8_SRGB;
 192    case MESA_FORMAT_SL8:
 193       return PIPE_FORMAT_L8_SRGB;
 194    case MESA_FORMAT_SRGB8:
 195       return PIPE_FORMAT_R8G8B8_SRGB;
 196    case MESA_FORMAT_SRGBA8:
 197       return PIPE_FORMAT_A8B8G8R8_SRGB;
 198    case MESA_FORMAT_SARGB8:
 199       return PIPE_FORMAT_B8G8R8A8_SRGB;
 200 #endif
 201    default:
 202       assert(0);
 203       return PIPE_FORMAT_NONE;
 204    }
 205 }
 206
 207
 208 /**
 209  * Translate Gallium format to Mesa format.
 210  */
 211 gl_format
 212 st_pipe_format_to_mesa_format(enum pipe_format format)
 213 {
 214    switch (format) {
 215    case PIPE_FORMAT_A8B8G8R8_UNORM:
 216       return MESA_FORMAT_RGBA8888;
 217    case PIPE_FORMAT_R8G8B8A8_UNORM:
 218       return MESA_FORMAT_RGBA8888_REV;
 219    case PIPE_FORMAT_B8G8R8A8_UNORM:
 220       return MESA_FORMAT_ARGB8888;
 221    case PIPE_FORMAT_A8R8G8B8_UNORM:
 222       return MESA_FORMAT_ARGB8888_REV;
 223    case PIPE_FORMAT_B8G8R8X8_UNORM:
 224       return MESA_FORMAT_XRGB8888;
 225    case PIPE_FORMAT_X8R8G8B8_UNORM:
 226       return MESA_FORMAT_XRGB8888_REV;
 227    case PIPE_FORMAT_B5G5R5A1_UNORM:
 228       return MESA_FORMAT_ARGB1555;
 229    case PIPE_FORMAT_B4G4R4A4_UNORM:
 230       return MESA_FORMAT_ARGB4444;
 231    case PIPE_FORMAT_B5G6R5_UNORM:
 232       return MESA_FORMAT_RGB565;
 233    case PIPE_FORMAT_L8A8_UNORM:
 234       return MESA_FORMAT_AL88;
 235    case PIPE_FORMAT_A8_UNORM:
 236       return MESA_FORMAT_A8;
 237    case PIPE_FORMAT_L8_UNORM:
 238       return MESA_FORMAT_L8;
 239    case PIPE_FORMAT_I8_UNORM:
 240       return MESA_FORMAT_I8;
 241    case PIPE_FORMAT_S8_USCALED:
 242       return MESA_FORMAT_S8;
 243
 244    case PIPE_FORMAT_R16G16B16A16_SNORM:
 245       return MESA_FORMAT_SIGNED_RGBA_16;
 246
 247    case PIPE_FORMAT_Z16_UNORM:
 248       return MESA_FORMAT_Z16;
 249    case PIPE_FORMAT_Z32_UNORM:
 250       return MESA_FORMAT_Z32;
 251    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 252       return MESA_FORMAT_Z24_S8;
 253    case PIPE_FORMAT_X8Z24_UNORM:
 254       return MESA_FORMAT_Z24_X8;
 255    case PIPE_FORMAT_Z24X8_UNORM:
 256       return MESA_FORMAT_X8_Z24;
 257    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 258       return MESA_FORMAT_S8_Z24;
 259
 260    case PIPE_FORMAT_UYVY:
 261       return MESA_FORMAT_YCBCR;
 262    case PIPE_FORMAT_YUYV:
 263       return MESA_FORMAT_YCBCR_REV;
 264
 265 #if FEATURE_texture_s3tc
 266    case PIPE_FORMAT_DXT1_RGB:
 267       return MESA_FORMAT_RGB_DXT1;
 268    case PIPE_FORMAT_DXT1_RGBA:
 269       return MESA_FORMAT_RGBA_DXT1;
 270    case PIPE_FORMAT_DXT3_RGBA:
 271       return MESA_FORMAT_RGBA_DXT3;
 272    case PIPE_FORMAT_DXT5_RGBA:
 273       return MESA_FORMAT_RGBA_DXT5;
 274 #if FEATURE_EXT_texture_sRGB
 275    case PIPE_FORMAT_DXT1_SRGB:
 276       return MESA_FORMAT_SRGB_DXT1;
 277    case PIPE_FORMAT_DXT1_SRGBA:
 278       return MESA_FORMAT_SRGBA_DXT1;
 279    case PIPE_FORMAT_DXT3_SRGBA:
 280       return MESA_FORMAT_SRGBA_DXT3;
 281    case PIPE_FORMAT_DXT5_SRGBA:
 282       return MESA_FORMAT_SRGBA_DXT5;
 283 #endif
 284 #endif
 285
 286 #if FEATURE_EXT_texture_sRGB
 287    case PIPE_FORMAT_L8A8_SRGB:
 288       return MESA_FORMAT_SLA8;
 289    case PIPE_FORMAT_L8_SRGB:
 290       return MESA_FORMAT_SL8;
 291    case PIPE_FORMAT_R8G8B8_SRGB:
 292       return MESA_FORMAT_SRGB8;
 293    case PIPE_FORMAT_A8B8G8R8_SRGB:
 294       return MESA_FORMAT_SRGBA8;
 295    case PIPE_FORMAT_B8G8R8A8_SRGB:
 296       return MESA_FORMAT_SARGB8;
 297 #endif
 298    default:
 299       assert(0);
 300       return MESA_FORMAT_NONE;
 301    }
 302 }
 303
 304
 305 /**
 306  * Return first supported format from the given list.
 307  */
 308 static enum pipe_format
 309 find_supported_format(struct pipe_screen *screen,
 310                       const enum pipe_format formats[],
 311                       uint num_formats,
 312                       enum pipe_texture_target target,
 313                       unsigned tex_usage,
 314                       unsigned geom_flags)
 315 {
 316    uint i;
 317    for (i = 0; i < num_formats; i++) {
 318       if (screen->is_format_supported(screen, formats[i], target,
 319                                       tex_usage, geom_flags)) {
 320          return formats[i];
 321       }
 322    }
 323    return PIPE_FORMAT_NONE;
 324 }
 325
 326
 327 /**
 328  * Find an RGBA format supported by the context/winsys.
 329  */
 330 static enum pipe_format
 331 default_rgba_format(struct pipe_screen *screen,
 332                     enum pipe_texture_target target,
 333                     unsigned tex_usage,
 334                     unsigned geom_flags)
 335 {
 336    static const enum pipe_format colorFormats[] = {
 337       PIPE_FORMAT_B8G8R8A8_UNORM,
 338       PIPE_FORMAT_A8R8G8B8_UNORM,
 339       PIPE_FORMAT_A8B8G8R8_UNORM,
 340       PIPE_FORMAT_B5G6R5_UNORM
 341    };
 342    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 343                                 target, tex_usage, geom_flags);
 344 }
 345
 346
 347 /**
 348  * Find an RGB format supported by the context/winsys.
 349  */
 350 static enum pipe_format
 351 default_rgb_format(struct pipe_screen *screen,
 352                    enum pipe_texture_target target,
 353                    unsigned tex_usage,
 354                    unsigned geom_flags)
 355 {
 356    static const enum pipe_format colorFormats[] = {
 357       PIPE_FORMAT_B8G8R8X8_UNORM,
 358       PIPE_FORMAT_X8R8G8B8_UNORM,
 359       PIPE_FORMAT_X8B8G8R8_UNORM,
 360       PIPE_FORMAT_B8G8R8A8_UNORM,
 361       PIPE_FORMAT_A8R8G8B8_UNORM,
 362       PIPE_FORMAT_A8B8G8R8_UNORM,
 363       PIPE_FORMAT_B5G6R5_UNORM
 364    };
 365    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 366                                 target, tex_usage, geom_flags);
 367 }
 368
 369 /**
 370  * Find an sRGBA format supported by the context/winsys.
 371  */
 372 static enum pipe_format
 373 default_srgba_format(struct pipe_screen *screen,
 374                     enum pipe_texture_target target,
 375                     unsigned tex_usage,
 376                     unsigned geom_flags)
 377 {
 378    static const enum pipe_format colorFormats[] = {
 379       PIPE_FORMAT_B8G8R8A8_SRGB,
 380       PIPE_FORMAT_A8R8G8B8_SRGB,
 381       PIPE_FORMAT_A8B8G8R8_SRGB,
 382    };
 383    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 384                                 target, tex_usage, geom_flags);
 385 }
 386
 387
 388 /**
 389  * Search list of formats for first RGBA format with >8 bits/channel.
 390  */
 391 static enum pipe_format
 392 default_deep_rgba_format(struct pipe_screen *screen,
 393                          enum pipe_texture_target target,
 394                          unsigned tex_usage,
 395                          unsigned geom_flags)
 396 {
 397    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM, target, tex_usage, geom_flags)) {
 398       return PIPE_FORMAT_R16G16B16A16_SNORM;
 399    }
 400    if (tex_usage & PIPE_BIND_RENDER_TARGET)
 401       return default_rgba_format(screen, target, tex_usage, geom_flags);
 402    else
 403       return PIPE_FORMAT_NONE;
 404 }
 405
 406
 407 /**
 408  * Given an OpenGL internalFormat value for a texture or surface, return
 409  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
 410  * \param target  one of PIPE_TEXTURE_x
 411  * \param tex_usage  either PIPE_BIND_RENDER_TARGET
 412  *                   or PIPE_BIND_SAMPLER_VIEW
 413  */
 414 enum pipe_format
 415 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 416                  enum pipe_texture_target target, unsigned tex_usage)
 417 {
 418    unsigned geom_flags = 0;
 419
 420    switch (internalFormat) {
 421    case 4:
 422    case GL_RGBA:
 423    case GL_COMPRESSED_RGBA:
 424    case GL_RGBA8:
 425    case GL_RGB10_A2:
 426    case GL_RGBA12:
 427       return default_rgba_format( screen, target, tex_usage, geom_flags );
 428    case 3:
 429    case GL_RGB:
 430    case GL_COMPRESSED_RGB:
 431       return default_rgb_format( screen, target, tex_usage, geom_flags );
 432    case GL_RGBA16:
 433       if (tex_usage & PIPE_BIND_RENDER_TARGET)
 434          return default_deep_rgba_format( screen, target, tex_usage, geom_flags );
 435       else
 436          return default_rgba_format( screen, target, tex_usage, geom_flags );
 437
 438    case GL_RGBA4:
 439    case GL_RGBA2:
 440       if (screen->is_format_supported( screen, PIPE_FORMAT_B4G4R4A4_UNORM, target, tex_usage, geom_flags ))
 441          return PIPE_FORMAT_B4G4R4A4_UNORM;
 442       return default_rgba_format( screen, target, tex_usage, geom_flags );
 443
 444    case GL_RGB5_A1:
 445       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM, target, tex_usage, geom_flags ))
 446          return PIPE_FORMAT_B5G5R5A1_UNORM;
 447       return default_rgba_format( screen, target, tex_usage, geom_flags );
 448
 449    case GL_RGB8:
 450    case GL_RGB10:
 451    case GL_RGB12:
 452    case GL_RGB16:
 453       return default_rgb_format( screen, target, tex_usage, geom_flags );
 454
 455    case GL_RGB5:
 456    case GL_RGB4:
 457    case GL_R3_G3_B2:
 458       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G6R5_UNORM, target, tex_usage, geom_flags ))
 459          return PIPE_FORMAT_B5G6R5_UNORM;
 460       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM, target, tex_usage, geom_flags ))
 461          return PIPE_FORMAT_B5G5R5A1_UNORM;
 462       return default_rgba_format( screen, target, tex_usage, geom_flags );
 463
 464    case GL_ALPHA:
 465    case GL_ALPHA4:
 466    case GL_ALPHA8:
 467    case GL_ALPHA12:
 468    case GL_ALPHA16:
 469    case GL_COMPRESSED_ALPHA:
 470       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target, tex_usage, geom_flags ))
 471          return PIPE_FORMAT_A8_UNORM;
 472       return default_rgba_format( screen, target, tex_usage, geom_flags );
 473
 474    case 1:
 475    case GL_LUMINANCE:
 476    case GL_LUMINANCE4:
 477    case GL_LUMINANCE8:
 478    case GL_LUMINANCE12:
 479    case GL_LUMINANCE16:
 480    case GL_COMPRESSED_LUMINANCE:
 481       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target, tex_usage, geom_flags ))
 482          return PIPE_FORMAT_L8_UNORM;
 483       return default_rgba_format( screen, target, tex_usage, geom_flags );
 484
 485    case 2:
 486    case GL_LUMINANCE_ALPHA:
 487    case GL_LUMINANCE4_ALPHA4:
 488    case GL_LUMINANCE6_ALPHA2:
 489    case GL_LUMINANCE8_ALPHA8:
 490    case GL_LUMINANCE12_ALPHA4:
 491    case GL_LUMINANCE12_ALPHA12:
 492    case GL_LUMINANCE16_ALPHA16:
 493    case GL_COMPRESSED_LUMINANCE_ALPHA:
 494       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target, tex_usage, geom_flags ))
 495          return PIPE_FORMAT_L8A8_UNORM;
 496       return default_rgba_format( screen, target, tex_usage, geom_flags );
 497
 498    case GL_INTENSITY:
 499    case GL_INTENSITY4:
 500    case GL_INTENSITY8:
 501    case GL_INTENSITY12:
 502    case GL_INTENSITY16:
 503    case GL_COMPRESSED_INTENSITY:
 504       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target, tex_usage, geom_flags ))
 505          return PIPE_FORMAT_I8_UNORM;
 506       return default_rgba_format( screen, target, tex_usage, geom_flags );
 507
 508    case GL_YCBCR_MESA:
 509       if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 510                                       target, tex_usage, geom_flags)) {
 511          return PIPE_FORMAT_UYVY;
 512       }
 513       if (screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 514                                       target, tex_usage, geom_flags)) {
 515          return PIPE_FORMAT_YUYV;
 516       }
 517       return PIPE_FORMAT_NONE;
 518
 519    case GL_RGB_S3TC:
 520    case GL_RGB4_S3TC:
 521    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 522       return PIPE_FORMAT_DXT1_RGB;
 523
 524    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 525       return PIPE_FORMAT_DXT1_RGBA;
 526
 527    case GL_RGBA_S3TC:
 528    case GL_RGBA4_S3TC:
 529    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 530       return PIPE_FORMAT_DXT3_RGBA;
 531
 532    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 533       return PIPE_FORMAT_DXT5_RGBA;
 534
 535 #if 0
 536    case GL_COMPRESSED_RGB_FXT1_3DFX:
 537       return PIPE_FORMAT_RGB_FXT1;
 538    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 539       return PIPE_FORMAT_RGB_FXT1;
 540 #endif
 541
 542    case GL_DEPTH_COMPONENT16:
 543       if (screen->is_format_supported( screen, PIPE_FORMAT_Z16_UNORM, target, tex_usage, geom_flags ))
 544          return PIPE_FORMAT_Z16_UNORM;
 545       /* fall-through */
 546    case GL_DEPTH_COMPONENT24:
 547       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED, target, tex_usage, geom_flags ))
 548          return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 549       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM, target, tex_usage, geom_flags ))
 550          return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 551       /* fall-through */
 552    case GL_DEPTH_COMPONENT32:
 553       if (screen->is_format_supported( screen, PIPE_FORMAT_Z32_UNORM, target, tex_usage, geom_flags ))
 554          return PIPE_FORMAT_Z32_UNORM;
 555       /* fall-through */
 556    case GL_DEPTH_COMPONENT:
 557       {
 558          static const enum pipe_format formats[] = {
 559             PIPE_FORMAT_Z16_UNORM,
 560             PIPE_FORMAT_Z32_UNORM,
 561             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 562             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 563          };
 564          return find_supported_format(screen, formats, Elements(formats),
 565                                       target, tex_usage, geom_flags);
 566       }
 567
 568    case GL_STENCIL_INDEX:
 569    case GL_STENCIL_INDEX1_EXT:
 570    case GL_STENCIL_INDEX4_EXT:
 571    case GL_STENCIL_INDEX8_EXT:
 572    case GL_STENCIL_INDEX16_EXT:
 573       {
 574          static const enum pipe_format formats[] = {
 575             PIPE_FORMAT_S8_USCALED,
 576             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 577             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 578          };
 579          return find_supported_format(screen, formats, Elements(formats),
 580                                       target, tex_usage, geom_flags);
 581       }
 582
 583    case GL_DEPTH_STENCIL_EXT:
 584    case GL_DEPTH24_STENCIL8_EXT:
 585       {
 586          static const enum pipe_format formats[] = {
 587             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 588             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 589          };
 590          return find_supported_format(screen, formats, Elements(formats),
 591                                       target, tex_usage, geom_flags);
 592       }
 593
 594    case GL_SRGB_EXT:
 595    case GL_SRGB8_EXT:
 596    case GL_COMPRESSED_SRGB_EXT:
 597    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 598    case GL_SRGB_ALPHA_EXT:
 599    case GL_SRGB8_ALPHA8_EXT:
 600       return default_srgba_format( screen, target, tex_usage, geom_flags );
 601    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 602       return PIPE_FORMAT_DXT1_SRGB;
 603    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 604       return PIPE_FORMAT_DXT1_SRGBA;
 605    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 606       return PIPE_FORMAT_DXT3_SRGBA;
 607    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 608       return PIPE_FORMAT_DXT5_SRGBA;
 609
 610    case GL_SLUMINANCE_ALPHA_EXT:
 611    case GL_SLUMINANCE8_ALPHA8_EXT:
 612    case GL_COMPRESSED_SLUMINANCE_EXT:
 613    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 614       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_SRGB, target, tex_usage, geom_flags ))
 615          return PIPE_FORMAT_L8A8_SRGB;
 616       return default_srgba_format( screen, target, tex_usage, geom_flags );
 617
 618    case GL_SLUMINANCE_EXT:
 619    case GL_SLUMINANCE8_EXT:
 620       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_SRGB, target, tex_usage, geom_flags ))
 621          return PIPE_FORMAT_L8_SRGB;
 622       return default_srgba_format( screen, target, tex_usage, geom_flags );
 623
 624    default:
 625       return PIPE_FORMAT_NONE;
 626    }
 627 }
 628
 629
 630 static GLboolean
 631 is_depth_or_stencil_format(GLenum internalFormat)
 632 {
 633    switch (internalFormat) {
 634    case GL_DEPTH_COMPONENT:
 635    case GL_DEPTH_COMPONENT16:
 636    case GL_DEPTH_COMPONENT24:
 637    case GL_DEPTH_COMPONENT32:
 638    case GL_STENCIL_INDEX:
 639    case GL_STENCIL_INDEX1_EXT:
 640    case GL_STENCIL_INDEX4_EXT:
 641    case GL_STENCIL_INDEX8_EXT:
 642    case GL_STENCIL_INDEX16_EXT:
 643    case GL_DEPTH_STENCIL_EXT:
 644    case GL_DEPTH24_STENCIL8_EXT:
 645       return GL_TRUE;
 646    default:
 647       return GL_FALSE;
 648    }
 649 }
 650
 651 /**
 652  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 653  */
 654 enum pipe_format
 655 st_choose_renderbuffer_format(struct pipe_screen *screen,
 656                               GLenum internalFormat)
 657 {
 658    uint usage;
 659    if (is_depth_or_stencil_format(internalFormat))
 660       usage = PIPE_BIND_DEPTH_STENCIL;
 661    else
 662       usage = PIPE_BIND_RENDER_TARGET;
 663    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D, usage);
 664 }
 665
 666
 667 /**
 668  * Called via ctx->Driver.chooseTextureFormat().
 669  */
 670 gl_format
 671 st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 672                        GLenum format, GLenum type)
 673 {
 674    enum pipe_format pFormat;
 675
 676    (void) format;
 677    (void) type;
 678
 679    pFormat = st_choose_format(ctx->st->pipe->screen, internalFormat,
 680                               PIPE_TEXTURE_2D, PIPE_BIND_SAMPLER_VIEW);
 681    if (pFormat == PIPE_FORMAT_NONE)
 682       return MESA_FORMAT_NONE;
 683
 684    return st_pipe_format_to_mesa_format(pFormat);
 685 }
 686
 687
 688 /**
 689  * Test if a gallium format is equivalent to a GL format/type.
 690  */
 691 GLboolean
 692 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 693 {
 694    switch (pFormat) {
 695    case PIPE_FORMAT_A8B8G8R8_UNORM:
 696       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 697    case PIPE_FORMAT_A8R8G8B8_UNORM:
 698       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 699    case PIPE_FORMAT_B5G6R5_UNORM:
 700       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 701    /* XXX more combos... */
 702    default:
 703       return GL_FALSE;
 704    }
 705 }