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/image.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                format == PIPE_FORMAT_Z24X8_UNORM ||
  82                format == PIPE_FORMAT_X8Z24_UNORM) {
  83          return GL_UNSIGNED_INT_24_8;
  84       }
  85       else {
  86          const GLuint size = format_max_bits(format);
  87          if (size == 8) {
  88             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
  89                return GL_UNSIGNED_BYTE;
  90             else
  91                return GL_BYTE;
  92          }
  93          else if (size == 16) {
  94             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
  95                return GL_UNSIGNED_SHORT;
  96             else
  97                return GL_SHORT;
  98          }
  99          else {
 100             assert( size <= 32 );
 101             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
 102                return GL_UNSIGNED_INT;
 103             else
 104                return GL_INT;
 105          }
 106       }
 107    }
 108    else if (format == PIPE_FORMAT_UYVY) {
 109       return GL_UNSIGNED_SHORT;
 110    }
 111    else if (format == PIPE_FORMAT_YUYV) {
 112       return GL_UNSIGNED_SHORT;
 113    }
 114    else {
 115       /* compressed format? */
 116       assert(0);
 117    }
 118
 119    assert(0);
 120    return GL_NONE;
 121 }
 122
 123
 124 /**
 125  * Translate Mesa format to Gallium format.
 126  */
 127 enum pipe_format
 128 st_mesa_format_to_pipe_format(gl_format mesaFormat)
 129 {
 130    switch (mesaFormat) {
 131    case MESA_FORMAT_RGBA8888:
 132       return PIPE_FORMAT_A8B8G8R8_UNORM;
 133    case MESA_FORMAT_RGBA8888_REV:
 134       return PIPE_FORMAT_R8G8B8A8_UNORM;
 135    case MESA_FORMAT_ARGB8888:
 136       return PIPE_FORMAT_B8G8R8A8_UNORM;
 137    case MESA_FORMAT_ARGB8888_REV:
 138       return PIPE_FORMAT_A8R8G8B8_UNORM;
 139    case MESA_FORMAT_XRGB8888:
 140       return PIPE_FORMAT_B8G8R8X8_UNORM;
 141    case MESA_FORMAT_XRGB8888_REV:
 142       return PIPE_FORMAT_X8R8G8B8_UNORM;
 143    case MESA_FORMAT_ARGB1555:
 144       return PIPE_FORMAT_B5G5R5A1_UNORM;
 145    case MESA_FORMAT_ARGB4444:
 146       return PIPE_FORMAT_B4G4R4A4_UNORM;
 147    case MESA_FORMAT_RGB565:
 148       return PIPE_FORMAT_B5G6R5_UNORM;
 149    case MESA_FORMAT_AL88:
 150       return PIPE_FORMAT_L8A8_UNORM;
 151    case MESA_FORMAT_A8:
 152       return PIPE_FORMAT_A8_UNORM;
 153    case MESA_FORMAT_L8:
 154       return PIPE_FORMAT_L8_UNORM;
 155    case MESA_FORMAT_I8:
 156       return PIPE_FORMAT_I8_UNORM;
 157    case MESA_FORMAT_Z16:
 158       return PIPE_FORMAT_Z16_UNORM;
 159    case MESA_FORMAT_Z32:
 160       return PIPE_FORMAT_Z32_UNORM;
 161    case MESA_FORMAT_Z24_S8:
 162       return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 163    case MESA_FORMAT_S8_Z24:
 164       return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 165    case MESA_FORMAT_Z24_X8:
 166       return PIPE_FORMAT_X8Z24_UNORM;
 167    case MESA_FORMAT_X8_Z24:
 168       return PIPE_FORMAT_Z24X8_UNORM;
 169    case MESA_FORMAT_S8:
 170       return PIPE_FORMAT_S8_USCALED;
 171    case MESA_FORMAT_YCBCR:
 172       return PIPE_FORMAT_UYVY;
 173 #if FEATURE_texture_s3tc
 174    case MESA_FORMAT_RGB_DXT1:
 175       return PIPE_FORMAT_DXT1_RGB;
 176    case MESA_FORMAT_RGBA_DXT1:
 177       return PIPE_FORMAT_DXT1_RGBA;
 178    case MESA_FORMAT_RGBA_DXT3:
 179       return PIPE_FORMAT_DXT3_RGBA;
 180    case MESA_FORMAT_RGBA_DXT5:
 181       return PIPE_FORMAT_DXT5_RGBA;
 182 #if FEATURE_EXT_texture_sRGB
 183    case MESA_FORMAT_SRGB_DXT1:
 184       return PIPE_FORMAT_DXT1_SRGB;
 185    case MESA_FORMAT_SRGBA_DXT1:
 186       return PIPE_FORMAT_DXT1_SRGBA;
 187    case MESA_FORMAT_SRGBA_DXT3:
 188       return PIPE_FORMAT_DXT3_SRGBA;
 189    case MESA_FORMAT_SRGBA_DXT5:
 190       return PIPE_FORMAT_DXT5_SRGBA;
 191 #endif
 192 #endif
 193 #if FEATURE_EXT_texture_sRGB
 194    case MESA_FORMAT_SLA8:
 195       return PIPE_FORMAT_L8A8_SRGB;
 196    case MESA_FORMAT_SL8:
 197       return PIPE_FORMAT_L8_SRGB;
 198    case MESA_FORMAT_SRGB8:
 199       return PIPE_FORMAT_R8G8B8_SRGB;
 200    case MESA_FORMAT_SRGBA8:
 201       return PIPE_FORMAT_A8B8G8R8_SRGB;
 202    case MESA_FORMAT_SARGB8:
 203       return PIPE_FORMAT_B8G8R8A8_SRGB;
 204 #endif
 205    case MESA_FORMAT_R8:
 206       return PIPE_FORMAT_R8_UNORM;
 207    case MESA_FORMAT_R16:
 208       return PIPE_FORMAT_R16_UNORM;
 209    case MESA_FORMAT_RG88:
 210       return PIPE_FORMAT_R8G8_UNORM;
 211    case MESA_FORMAT_RG1616:
 212       return PIPE_FORMAT_R16G16_UNORM;
 213    default:
 214       assert(0);
 215       return PIPE_FORMAT_NONE;
 216    }
 217 }
 218
 219
 220 /**
 221  * Translate Gallium format to Mesa format.
 222  */
 223 gl_format
 224 st_pipe_format_to_mesa_format(enum pipe_format format)
 225 {
 226    switch (format) {
 227    case PIPE_FORMAT_A8B8G8R8_UNORM:
 228       return MESA_FORMAT_RGBA8888;
 229    case PIPE_FORMAT_R8G8B8A8_UNORM:
 230       return MESA_FORMAT_RGBA8888_REV;
 231    case PIPE_FORMAT_B8G8R8A8_UNORM:
 232       return MESA_FORMAT_ARGB8888;
 233    case PIPE_FORMAT_A8R8G8B8_UNORM:
 234       return MESA_FORMAT_ARGB8888_REV;
 235    case PIPE_FORMAT_B8G8R8X8_UNORM:
 236       return MESA_FORMAT_XRGB8888;
 237    case PIPE_FORMAT_X8R8G8B8_UNORM:
 238       return MESA_FORMAT_XRGB8888_REV;
 239    case PIPE_FORMAT_B5G5R5A1_UNORM:
 240       return MESA_FORMAT_ARGB1555;
 241    case PIPE_FORMAT_B4G4R4A4_UNORM:
 242       return MESA_FORMAT_ARGB4444;
 243    case PIPE_FORMAT_B5G6R5_UNORM:
 244       return MESA_FORMAT_RGB565;
 245    case PIPE_FORMAT_L8A8_UNORM:
 246       return MESA_FORMAT_AL88;
 247    case PIPE_FORMAT_A8_UNORM:
 248       return MESA_FORMAT_A8;
 249    case PIPE_FORMAT_L8_UNORM:
 250       return MESA_FORMAT_L8;
 251    case PIPE_FORMAT_I8_UNORM:
 252       return MESA_FORMAT_I8;
 253    case PIPE_FORMAT_S8_USCALED:
 254       return MESA_FORMAT_S8;
 255
 256    case PIPE_FORMAT_R16G16B16A16_SNORM:
 257       return MESA_FORMAT_SIGNED_RGBA_16;
 258
 259    case PIPE_FORMAT_Z16_UNORM:
 260       return MESA_FORMAT_Z16;
 261    case PIPE_FORMAT_Z32_UNORM:
 262       return MESA_FORMAT_Z32;
 263    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 264       return MESA_FORMAT_Z24_S8;
 265    case PIPE_FORMAT_X8Z24_UNORM:
 266       return MESA_FORMAT_Z24_X8;
 267    case PIPE_FORMAT_Z24X8_UNORM:
 268       return MESA_FORMAT_X8_Z24;
 269    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 270       return MESA_FORMAT_S8_Z24;
 271
 272    case PIPE_FORMAT_UYVY:
 273       return MESA_FORMAT_YCBCR;
 274    case PIPE_FORMAT_YUYV:
 275       return MESA_FORMAT_YCBCR_REV;
 276
 277 #if FEATURE_texture_s3tc
 278    case PIPE_FORMAT_DXT1_RGB:
 279       return MESA_FORMAT_RGB_DXT1;
 280    case PIPE_FORMAT_DXT1_RGBA:
 281       return MESA_FORMAT_RGBA_DXT1;
 282    case PIPE_FORMAT_DXT3_RGBA:
 283       return MESA_FORMAT_RGBA_DXT3;
 284    case PIPE_FORMAT_DXT5_RGBA:
 285       return MESA_FORMAT_RGBA_DXT5;
 286 #if FEATURE_EXT_texture_sRGB
 287    case PIPE_FORMAT_DXT1_SRGB:
 288       return MESA_FORMAT_SRGB_DXT1;
 289    case PIPE_FORMAT_DXT1_SRGBA:
 290       return MESA_FORMAT_SRGBA_DXT1;
 291    case PIPE_FORMAT_DXT3_SRGBA:
 292       return MESA_FORMAT_SRGBA_DXT3;
 293    case PIPE_FORMAT_DXT5_SRGBA:
 294       return MESA_FORMAT_SRGBA_DXT5;
 295 #endif
 296 #endif
 297
 298 #if FEATURE_EXT_texture_sRGB
 299    case PIPE_FORMAT_L8A8_SRGB:
 300       return MESA_FORMAT_SLA8;
 301    case PIPE_FORMAT_L8_SRGB:
 302       return MESA_FORMAT_SL8;
 303    case PIPE_FORMAT_R8G8B8_SRGB:
 304       return MESA_FORMAT_SRGB8;
 305    case PIPE_FORMAT_A8B8G8R8_SRGB:
 306       return MESA_FORMAT_SRGBA8;
 307    case PIPE_FORMAT_B8G8R8A8_SRGB:
 308       return MESA_FORMAT_SARGB8;
 309 #endif
 310
 311    case PIPE_FORMAT_R8_UNORM:
 312       return MESA_FORMAT_R8;
 313    case PIPE_FORMAT_R16_UNORM:
 314       return MESA_FORMAT_R16;
 315    case PIPE_FORMAT_R8G8_UNORM:
 316       return MESA_FORMAT_RG88;
 317    case PIPE_FORMAT_R16G16_UNORM:
 318       return MESA_FORMAT_RG1616;
 319    default:
 320       assert(0);
 321       return MESA_FORMAT_NONE;
 322    }
 323 }
 324
 325
 326 /**
 327  * Return first supported format from the given list.
 328  */
 329 static enum pipe_format
 330 find_supported_format(struct pipe_screen *screen,
 331                       const enum pipe_format formats[],
 332                       uint num_formats,
 333                       enum pipe_texture_target target,
 334                       unsigned sample_count,
 335                       unsigned tex_usage,
 336                       unsigned geom_flags)
 337 {
 338    uint i;
 339    for (i = 0; i < num_formats; i++) {
 340       if (screen->is_format_supported(screen, formats[i], target,
 341                                       sample_count, tex_usage, geom_flags)) {
 342          return formats[i];
 343       }
 344    }
 345    return PIPE_FORMAT_NONE;
 346 }
 347
 348
 349 /**
 350  * Find an RGBA format supported by the context/winsys.
 351  */
 352 static enum pipe_format
 353 default_rgba_format(struct pipe_screen *screen,
 354                     enum pipe_texture_target target,
 355                     unsigned sample_count,
 356                     unsigned tex_usage,
 357                     unsigned geom_flags)
 358 {
 359    static const enum pipe_format colorFormats[] = {
 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, sample_count, tex_usage, geom_flags);
 367 }
 368
 369
 370 /**
 371  * Find an RGB format supported by the context/winsys.
 372  */
 373 static enum pipe_format
 374 default_rgb_format(struct pipe_screen *screen,
 375                    enum pipe_texture_target target,
 376                    unsigned sample_count,
 377                    unsigned tex_usage,
 378                    unsigned geom_flags)
 379 {
 380    static const enum pipe_format colorFormats[] = {
 381       PIPE_FORMAT_B8G8R8X8_UNORM,
 382       PIPE_FORMAT_X8R8G8B8_UNORM,
 383       PIPE_FORMAT_X8B8G8R8_UNORM,
 384       PIPE_FORMAT_B8G8R8A8_UNORM,
 385       PIPE_FORMAT_A8R8G8B8_UNORM,
 386       PIPE_FORMAT_A8B8G8R8_UNORM,
 387       PIPE_FORMAT_B5G6R5_UNORM
 388    };
 389    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 390                                 target, sample_count, tex_usage, geom_flags);
 391 }
 392
 393 /**
 394  * Find an sRGBA format supported by the context/winsys.
 395  */
 396 static enum pipe_format
 397 default_srgba_format(struct pipe_screen *screen,
 398                     enum pipe_texture_target target,
 399                     unsigned sample_count,
 400                     unsigned tex_usage,
 401                     unsigned geom_flags)
 402 {
 403    static const enum pipe_format colorFormats[] = {
 404       PIPE_FORMAT_B8G8R8A8_SRGB,
 405       PIPE_FORMAT_A8R8G8B8_SRGB,
 406       PIPE_FORMAT_A8B8G8R8_SRGB,
 407    };
 408    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 409                                 target, sample_count, tex_usage, geom_flags);
 410 }
 411
 412
 413 /**
 414  * Given an OpenGL internalFormat value for a texture or surface, return
 415  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
 416  * This is called during glTexImage2D, for example.
 417  *
 418  * The bindings parameter typically has PIPE_BIND_SAMPLER_VIEW set, plus
 419  * either PIPE_BINDING_RENDER_TARGET or PIPE_BINDING_DEPTH_STENCIL if
 420  * we want render-to-texture ability.
 421  *
 422  * \param internalFormat  the user value passed to glTexImage2D
 423  * \param target  one of PIPE_TEXTURE_x
 424  * \param bindings  bitmask of PIPE_BIND_x flags.
 425  */
 426 enum pipe_format
 427 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 428                  enum pipe_texture_target target, unsigned sample_count,
 429                  unsigned bindings)
 430 {
 431    unsigned geom_flags = 0; /* we don't care about POT vs. NPOT here, yet */
 432
 433    switch (internalFormat) {
 434    case 4:
 435    case GL_RGBA:
 436    case GL_RGBA8:
 437    case GL_RGB10_A2:
 438    case GL_RGBA12:
 439       return default_rgba_format( screen, target, sample_count, bindings,
 440                                   geom_flags );
 441    case 3:
 442    case GL_RGB:
 443       return default_rgb_format( screen, target, sample_count, bindings,
 444                                  geom_flags );
 445    case GL_RGBA16:
 446       return default_rgba_format( screen, target, sample_count, bindings,
 447                                   geom_flags );
 448
 449    case GL_RGBA4:
 450    case GL_RGBA2:
 451       if (screen->is_format_supported( screen, PIPE_FORMAT_B4G4R4A4_UNORM,
 452                                        target, sample_count, bindings,
 453                                        geom_flags ))
 454          return PIPE_FORMAT_B4G4R4A4_UNORM;
 455       return default_rgba_format( screen, target, sample_count, bindings,
 456                                   geom_flags );
 457
 458    case GL_RGB5_A1:
 459       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM,
 460                                        target, sample_count, bindings,
 461                                        geom_flags ))
 462          return PIPE_FORMAT_B5G5R5A1_UNORM;
 463       return default_rgba_format( screen, target, sample_count, bindings,
 464                                   geom_flags );
 465
 466    case GL_RGB8:
 467    case GL_RGB10:
 468    case GL_RGB12:
 469    case GL_RGB16:
 470       return default_rgb_format( screen, target, sample_count, bindings,
 471                                  geom_flags );
 472
 473    case GL_RGB5:
 474    case GL_RGB4:
 475    case GL_R3_G3_B2:
 476       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G6R5_UNORM,
 477                                        target, sample_count, bindings,
 478                                        geom_flags ))
 479          return PIPE_FORMAT_B5G6R5_UNORM;
 480       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM,
 481                                        target, sample_count, bindings,
 482                                        geom_flags ))
 483          return PIPE_FORMAT_B5G5R5A1_UNORM;
 484       return default_rgba_format( screen, target, sample_count, bindings,
 485                                   geom_flags );
 486
 487    case GL_ALPHA:
 488    case GL_ALPHA4:
 489    case GL_ALPHA8:
 490    case GL_ALPHA12:
 491    case GL_ALPHA16:
 492    case GL_COMPRESSED_ALPHA:
 493       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target,
 494                                        sample_count, bindings, geom_flags ))
 495          return PIPE_FORMAT_A8_UNORM;
 496       return default_rgba_format( screen, target, sample_count, bindings,
 497                                   geom_flags );
 498
 499    case 1:
 500    case GL_LUMINANCE:
 501    case GL_LUMINANCE4:
 502    case GL_LUMINANCE8:
 503    case GL_LUMINANCE12:
 504    case GL_LUMINANCE16:
 505    case GL_COMPRESSED_LUMINANCE:
 506       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target,
 507                                        sample_count, bindings, geom_flags ))
 508          return PIPE_FORMAT_L8_UNORM;
 509       return default_rgba_format( screen, target, sample_count, bindings,
 510                                   geom_flags );
 511
 512    case 2:
 513    case GL_LUMINANCE_ALPHA:
 514    case GL_LUMINANCE4_ALPHA4:
 515    case GL_LUMINANCE6_ALPHA2:
 516    case GL_LUMINANCE8_ALPHA8:
 517    case GL_LUMINANCE12_ALPHA4:
 518    case GL_LUMINANCE12_ALPHA12:
 519    case GL_LUMINANCE16_ALPHA16:
 520    case GL_COMPRESSED_LUMINANCE_ALPHA:
 521       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target,
 522                                        sample_count, bindings, geom_flags ))
 523          return PIPE_FORMAT_L8A8_UNORM;
 524       return default_rgba_format( screen, target, sample_count, bindings,
 525                                   geom_flags );
 526
 527    case GL_INTENSITY:
 528    case GL_INTENSITY4:
 529    case GL_INTENSITY8:
 530    case GL_INTENSITY12:
 531    case GL_INTENSITY16:
 532    case GL_COMPRESSED_INTENSITY:
 533       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target,
 534                                        sample_count, bindings, geom_flags ))
 535          return PIPE_FORMAT_I8_UNORM;
 536       return default_rgba_format( screen, target, sample_count, bindings,
 537                                   geom_flags );
 538
 539    case GL_YCBCR_MESA:
 540       if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY, target,
 541                                       sample_count, bindings, geom_flags)) {
 542          return PIPE_FORMAT_UYVY;
 543       }
 544       if (screen->is_format_supported(screen, PIPE_FORMAT_YUYV, target,
 545                                       sample_count, bindings, geom_flags)) {
 546          return PIPE_FORMAT_YUYV;
 547       }
 548       return PIPE_FORMAT_NONE;
 549
 550    case GL_COMPRESSED_RGB:
 551       /* can only sample from compressed formats */
 552       if (bindings & ~PIPE_BIND_SAMPLER_VIEW)
 553          return PIPE_FORMAT_NONE;
 554       else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGB,
 555                                            target, sample_count, bindings,
 556                                            geom_flags))
 557          return PIPE_FORMAT_DXT1_RGB;
 558       else
 559          return default_rgb_format(screen, target, sample_count, bindings,
 560                                    geom_flags);
 561
 562    case GL_COMPRESSED_RGBA:
 563       /* can only sample from compressed formats */
 564       if (bindings & ~PIPE_BIND_SAMPLER_VIEW)
 565          return PIPE_FORMAT_NONE;
 566       else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_RGBA,
 567                                            target, sample_count, bindings,
 568                                            geom_flags))
 569          return PIPE_FORMAT_DXT3_RGBA;
 570       else
 571          return default_rgba_format(screen, target, sample_count, bindings,
 572                                     geom_flags);
 573
 574    case GL_RGB_S3TC:
 575    case GL_RGB4_S3TC:
 576    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 577       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGB,
 578                                       target, sample_count, bindings,
 579                                       geom_flags))
 580          return PIPE_FORMAT_DXT1_RGB;
 581       else
 582          return PIPE_FORMAT_NONE;
 583
 584    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 585       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGBA,
 586                                       target, sample_count, bindings,
 587                                       geom_flags))
 588          return PIPE_FORMAT_DXT1_RGBA;
 589       else
 590          return PIPE_FORMAT_NONE;
 591
 592    case GL_RGBA_S3TC:
 593    case GL_RGBA4_S3TC:
 594    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 595       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_RGBA,
 596                                       target, sample_count, bindings,
 597                                       geom_flags))
 598          return PIPE_FORMAT_DXT3_RGBA;
 599       else
 600          return PIPE_FORMAT_NONE;
 601
 602    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 603       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 604                                       target, sample_count, bindings,
 605                                       geom_flags))
 606          return PIPE_FORMAT_DXT5_RGBA;
 607       else
 608          return PIPE_FORMAT_NONE;
 609
 610 #if 0
 611    case GL_COMPRESSED_RGB_FXT1_3DFX:
 612       return PIPE_FORMAT_RGB_FXT1;
 613    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 614       return PIPE_FORMAT_RGB_FXT1;
 615 #endif
 616
 617    case GL_DEPTH_COMPONENT16:
 618       if (screen->is_format_supported(screen, PIPE_FORMAT_Z16_UNORM, target,
 619                                       sample_count, bindings, geom_flags))
 620          return PIPE_FORMAT_Z16_UNORM;
 621       /* fall-through */
 622    case GL_DEPTH_COMPONENT24:
 623       if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 624                                       target, sample_count, bindings, geom_flags))
 625          return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 626       if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 627                                       target, sample_count, bindings, geom_flags))
 628          return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 629       /* fall-through */
 630    case GL_DEPTH_COMPONENT32:
 631       if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_UNORM, target,
 632                                       sample_count, bindings, geom_flags))
 633          return PIPE_FORMAT_Z32_UNORM;
 634       /* fall-through */
 635    case GL_DEPTH_COMPONENT:
 636       {
 637          static const enum pipe_format formats[] = {
 638             PIPE_FORMAT_Z16_UNORM,
 639             PIPE_FORMAT_Z32_UNORM,
 640             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 641             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 642          };
 643          return find_supported_format(screen, formats, Elements(formats),
 644                                       target, sample_count, bindings, geom_flags);
 645       }
 646
 647    case GL_STENCIL_INDEX:
 648    case GL_STENCIL_INDEX1_EXT:
 649    case GL_STENCIL_INDEX4_EXT:
 650    case GL_STENCIL_INDEX8_EXT:
 651    case GL_STENCIL_INDEX16_EXT:
 652       {
 653          static const enum pipe_format formats[] = {
 654             PIPE_FORMAT_S8_USCALED,
 655             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 656             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 657          };
 658          return find_supported_format(screen, formats, Elements(formats),
 659                                       target, sample_count, bindings, geom_flags);
 660       }
 661
 662    case GL_DEPTH_STENCIL_EXT:
 663    case GL_DEPTH24_STENCIL8_EXT:
 664       {
 665          static const enum pipe_format formats[] = {
 666             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 667             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 668          };
 669          return find_supported_format(screen, formats, Elements(formats),
 670                                       target, sample_count, bindings, geom_flags);
 671       }
 672
 673    case GL_SRGB_EXT:
 674    case GL_SRGB8_EXT:
 675    case GL_COMPRESSED_SRGB_EXT:
 676    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 677    case GL_SRGB_ALPHA_EXT:
 678    case GL_SRGB8_ALPHA8_EXT:
 679       return default_srgba_format( screen, target, sample_count, bindings,
 680                                    geom_flags );
 681    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 682       return PIPE_FORMAT_DXT1_SRGB;
 683    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 684       return PIPE_FORMAT_DXT1_SRGBA;
 685    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 686       return PIPE_FORMAT_DXT3_SRGBA;
 687    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 688       return PIPE_FORMAT_DXT5_SRGBA;
 689
 690    case GL_SLUMINANCE_ALPHA_EXT:
 691    case GL_SLUMINANCE8_ALPHA8_EXT:
 692    case GL_COMPRESSED_SLUMINANCE_EXT:
 693    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 694       if (screen->is_format_supported(screen, PIPE_FORMAT_L8A8_SRGB, target,
 695                                       sample_count, bindings, geom_flags))
 696          return PIPE_FORMAT_L8A8_SRGB;
 697       return default_srgba_format( screen, target, sample_count, bindings,
 698                                    geom_flags );
 699
 700    case GL_SLUMINANCE_EXT:
 701    case GL_SLUMINANCE8_EXT:
 702       if (screen->is_format_supported(screen, PIPE_FORMAT_L8_SRGB, target,
 703                                       sample_count, bindings, geom_flags))
 704          return PIPE_FORMAT_L8_SRGB;
 705       return default_srgba_format( screen, target, sample_count, bindings,
 706                                    geom_flags );
 707
 708    case GL_RED:
 709    case GL_R8:
 710       if (screen->is_format_supported(screen, PIPE_FORMAT_R8_UNORM, target,
 711                                       sample_count, bindings, geom_flags))
 712               return PIPE_FORMAT_R8_UNORM;
 713       return PIPE_FORMAT_NONE;
 714    case GL_RG:
 715    case GL_RG8:
 716       if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM, target,
 717                                       sample_count, bindings, geom_flags))
 718               return PIPE_FORMAT_R8G8_UNORM;
 719       return PIPE_FORMAT_NONE;
 720
 721    case GL_R16:
 722       if (screen->is_format_supported(screen, PIPE_FORMAT_R16_UNORM, target,
 723                                       sample_count, bindings, geom_flags))
 724               return PIPE_FORMAT_R16_UNORM;
 725       return PIPE_FORMAT_NONE;
 726
 727    case GL_RG16:
 728       if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16_UNORM, target,
 729                                       sample_count, bindings, geom_flags))
 730               return PIPE_FORMAT_R16G16_UNORM;
 731       return PIPE_FORMAT_NONE;
 732
 733    case GL_COMPRESSED_RED_RGTC1:
 734       if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM, target,
 735                                       sample_count, bindings, geom_flags))
 736               return PIPE_FORMAT_RGTC1_UNORM;
 737       return PIPE_FORMAT_NONE;
 738
 739    case GL_COMPRESSED_SIGNED_RED_RGTC1:
 740       if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM, target,
 741                                       sample_count, bindings, geom_flags))
 742               return PIPE_FORMAT_RGTC1_SNORM;
 743       return PIPE_FORMAT_NONE;
 744
 745    case GL_COMPRESSED_RG_RGTC2:
 746       if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM, target,
 747                                       sample_count, bindings, geom_flags))
 748               return PIPE_FORMAT_RGTC2_UNORM;
 749       return PIPE_FORMAT_NONE;
 750
 751    case GL_COMPRESSED_SIGNED_RG_RGTC2:
 752       if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM, target,
 753                                       sample_count, bindings, geom_flags))
 754               return PIPE_FORMAT_RGTC2_SNORM;
 755       return PIPE_FORMAT_NONE;
 756
 757    default:
 758       return PIPE_FORMAT_NONE;
 759    }
 760 }
 761
 762
 763 /**
 764  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 765  */
 766 enum pipe_format
 767 st_choose_renderbuffer_format(struct pipe_screen *screen,
 768                               GLenum internalFormat, unsigned sample_count)
 769 {
 770    uint usage;
 771    if (_mesa_is_depth_or_stencil_format(internalFormat))
 772       usage = PIPE_BIND_DEPTH_STENCIL;
 773    else
 774       usage = PIPE_BIND_RENDER_TARGET;
 775    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D,
 776                            sample_count, usage);
 777 }
 778
 779
 780 /**
 781  * Called via ctx->Driver.chooseTextureFormat().
 782  */
 783 gl_format
 784 st_ChooseTextureFormat_renderable(struct gl_context *ctx, GLint internalFormat,
 785                                   GLenum format, GLenum type, GLboolean renderable)
 786 {
 787    struct pipe_screen *screen = st_context(ctx)->pipe->screen;
 788    enum pipe_format pFormat;
 789    uint bindings;
 790
 791    (void) format;
 792    (void) type;
 793
 794    /* GL textures may wind up being render targets, but we don't know
 795     * that in advance.  Specify potential render target flags now.
 796     */
 797    bindings = PIPE_BIND_SAMPLER_VIEW;
 798    if (renderable == GL_TRUE) {
 799       if (_mesa_is_depth_format(internalFormat) ||
 800           _mesa_is_depth_or_stencil_format(internalFormat))
 801          bindings |= PIPE_BIND_DEPTH_STENCIL;
 802       else
 803          bindings |= PIPE_BIND_RENDER_TARGET;
 804    }
 805
 806    pFormat = st_choose_format(screen, internalFormat,
 807                               PIPE_TEXTURE_2D, 0, bindings);
 808
 809    if (pFormat == PIPE_FORMAT_NONE) {
 810       /* try choosing format again, this time without render target bindings */
 811       pFormat = st_choose_format(screen, internalFormat,
 812                                  PIPE_TEXTURE_2D, 0, PIPE_BIND_SAMPLER_VIEW);
 813    }
 814
 815    if (pFormat == PIPE_FORMAT_NONE) {
 816       /* no luck at all */
 817       return MESA_FORMAT_NONE;
 818    }
 819
 820    return st_pipe_format_to_mesa_format(pFormat);
 821 }
 822
 823 gl_format
 824 st_ChooseTextureFormat(struct gl_context *ctx, GLint internalFormat,
 825                        GLenum format, GLenum type)
 826 {
 827    return st_ChooseTextureFormat_renderable(ctx, internalFormat,
 828                                             format, type, GL_TRUE);
 829 }
 830
 831 /**
 832  * Test if a gallium format is equivalent to a GL format/type.
 833  */
 834 GLboolean
 835 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 836 {
 837    switch (pFormat) {
 838    case PIPE_FORMAT_A8B8G8R8_UNORM:
 839       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 840    case PIPE_FORMAT_A8R8G8B8_UNORM:
 841       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 842    case PIPE_FORMAT_B5G6R5_UNORM:
 843       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 844    /* XXX more combos... */
 845    default:
 846       return GL_FALSE;
 847    }
 848 }
 849
 850 GLboolean
 851 st_sampler_compat_formats(enum pipe_format format1, enum pipe_format format2)
 852 {
 853    if (format1 == format2)
 854       return GL_TRUE;
 855
 856    if (format1 == PIPE_FORMAT_B8G8R8A8_UNORM &&
 857        format2 == PIPE_FORMAT_B8G8R8X8_UNORM)
 858       return GL_TRUE;
 859
 860    if (format1 == PIPE_FORMAT_B8G8R8X8_UNORM &&
 861        format2 == PIPE_FORMAT_B8G8R8A8_UNORM)
 862       return GL_TRUE;
 863
 864    if (format1 == PIPE_FORMAT_A8B8G8R8_UNORM &&
 865        format2 == PIPE_FORMAT_X8B8G8R8_UNORM)
 866       return GL_TRUE;
 867
 868    if (format1 == PIPE_FORMAT_X8B8G8R8_UNORM &&
 869        format2 == PIPE_FORMAT_A8B8G8R8_UNORM)
 870       return GL_TRUE;
 871
 872    if (format1 == PIPE_FORMAT_A8R8G8B8_UNORM &&
 873        format2 == PIPE_FORMAT_X8R8G8B8_UNORM)
 874       return GL_TRUE;
 875
 876    if (format1 == PIPE_FORMAT_X8R8G8B8_UNORM &&
 877        format2 == PIPE_FORMAT_A8R8G8B8_UNORM)
 878       return GL_TRUE;
 879
 880    return GL_FALSE;
 881 }