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/image.h"
  40 #include "main/macros.h"
  41
  42 #include "pipe/p_context.h"
  43 #include "pipe/p_defines.h"
  44 #include "pipe/p_screen.h"
  45 #include "util/u_format.h"
  46 #include "st_context.h"
  47 #include "st_format.h"
  48
  49
  50 static GLuint
  51 format_max_bits(enum pipe_format format)
  52 {
  53    GLuint size = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0);
  54
  55    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 1));
  56    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 2));
  57    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3));
  58    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0));
  59    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1));
  60    return size;
  61 }
  62
  63
  64 /**
  65  * Return basic GL datatype for the given gallium format.
  66  */
  67 GLenum
  68 st_format_datatype(enum pipe_format format)
  69 {
  70    const struct util_format_description *desc;
  71
  72    desc = util_format_description(format);
  73    assert(desc);
  74
  75    if (desc->layout == UTIL_FORMAT_LAYOUT_PLAIN) {
  76       if (format == PIPE_FORMAT_B5G5R5A1_UNORM ||
  77           format == PIPE_FORMAT_B5G6R5_UNORM) {
  78          return GL_UNSIGNED_SHORT;
  79       }
  80       else if (format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
  81                format == PIPE_FORMAT_S8_USCALED_Z24_UNORM) {
  82          return GL_UNSIGNED_INT_24_8;
  83       }
  84       else {
  85          const GLuint size = format_max_bits(format);
  86          if (size == 8) {
  87             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
  88                return GL_UNSIGNED_BYTE;
  89             else
  90                return GL_BYTE;
  91          }
  92          else if (size == 16) {
  93             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
  94                return GL_UNSIGNED_SHORT;
  95             else
  96                return GL_SHORT;
  97          }
  98          else {
  99             assert( size <= 32 );
 100             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
 101                return GL_UNSIGNED_INT;
 102             else
 103                return GL_INT;
 104          }
 105       }
 106    }
 107    else if (format == PIPE_FORMAT_UYVY) {
 108       return GL_UNSIGNED_SHORT;
 109    }
 110    else if (format == PIPE_FORMAT_YUYV) {
 111       return GL_UNSIGNED_SHORT;
 112    }
 113    else {
 114       /* compressed format? */
 115       assert(0);
 116    }
 117
 118    assert(0);
 119    return GL_NONE;
 120 }
 121
 122
 123 /**
 124  * Translate Mesa format to Gallium format.
 125  */
 126 enum pipe_format
 127 st_mesa_format_to_pipe_format(gl_format mesaFormat)
 128 {
 129    switch (mesaFormat) {
 130    case MESA_FORMAT_RGBA8888:
 131       return PIPE_FORMAT_A8B8G8R8_UNORM;
 132    case MESA_FORMAT_RGBA8888_REV:
 133       return PIPE_FORMAT_R8G8B8A8_UNORM;
 134    case MESA_FORMAT_ARGB8888:
 135       return PIPE_FORMAT_B8G8R8A8_UNORM;
 136    case MESA_FORMAT_ARGB8888_REV:
 137       return PIPE_FORMAT_A8R8G8B8_UNORM;
 138    case MESA_FORMAT_XRGB8888:
 139       return PIPE_FORMAT_B8G8R8X8_UNORM;
 140    case MESA_FORMAT_XRGB8888_REV:
 141       return PIPE_FORMAT_X8R8G8B8_UNORM;
 142    case MESA_FORMAT_ARGB1555:
 143       return PIPE_FORMAT_B5G5R5A1_UNORM;
 144    case MESA_FORMAT_ARGB4444:
 145       return PIPE_FORMAT_B4G4R4A4_UNORM;
 146    case MESA_FORMAT_RGB565:
 147       return PIPE_FORMAT_B5G6R5_UNORM;
 148    case MESA_FORMAT_AL88:
 149       return PIPE_FORMAT_L8A8_UNORM;
 150    case MESA_FORMAT_A8:
 151       return PIPE_FORMAT_A8_UNORM;
 152    case MESA_FORMAT_L8:
 153       return PIPE_FORMAT_L8_UNORM;
 154    case MESA_FORMAT_I8:
 155       return PIPE_FORMAT_I8_UNORM;
 156    case MESA_FORMAT_Z16:
 157       return PIPE_FORMAT_Z16_UNORM;
 158    case MESA_FORMAT_Z32:
 159       return PIPE_FORMAT_Z32_UNORM;
 160    case MESA_FORMAT_Z24_S8:
 161       return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 162    case MESA_FORMAT_S8_Z24:
 163       return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 164    case MESA_FORMAT_Z24_X8:
 165       return PIPE_FORMAT_X8Z24_UNORM;
 166    case MESA_FORMAT_X8_Z24:
 167       return PIPE_FORMAT_Z24X8_UNORM;
 168    case MESA_FORMAT_YCBCR:
 169       return PIPE_FORMAT_UYVY;
 170 #if FEATURE_texture_s3tc
 171    case MESA_FORMAT_RGB_DXT1:
 172       return PIPE_FORMAT_DXT1_RGB;
 173    case MESA_FORMAT_RGBA_DXT1:
 174       return PIPE_FORMAT_DXT1_RGBA;
 175    case MESA_FORMAT_RGBA_DXT3:
 176       return PIPE_FORMAT_DXT3_RGBA;
 177    case MESA_FORMAT_RGBA_DXT5:
 178       return PIPE_FORMAT_DXT5_RGBA;
 179 #if FEATURE_EXT_texture_sRGB
 180    case MESA_FORMAT_SRGB_DXT1:
 181       return PIPE_FORMAT_DXT1_SRGB;
 182    case MESA_FORMAT_SRGBA_DXT1:
 183       return PIPE_FORMAT_DXT1_SRGBA;
 184    case MESA_FORMAT_SRGBA_DXT3:
 185       return PIPE_FORMAT_DXT3_SRGBA;
 186    case MESA_FORMAT_SRGBA_DXT5:
 187       return PIPE_FORMAT_DXT5_SRGBA;
 188 #endif
 189 #endif
 190 #if FEATURE_EXT_texture_sRGB
 191    case MESA_FORMAT_SLA8:
 192       return PIPE_FORMAT_L8A8_SRGB;
 193    case MESA_FORMAT_SL8:
 194       return PIPE_FORMAT_L8_SRGB;
 195    case MESA_FORMAT_SRGB8:
 196       return PIPE_FORMAT_R8G8B8_SRGB;
 197    case MESA_FORMAT_SRGBA8:
 198       return PIPE_FORMAT_A8B8G8R8_SRGB;
 199    case MESA_FORMAT_SARGB8:
 200       return PIPE_FORMAT_B8G8R8A8_SRGB;
 201 #endif
 202    default:
 203       assert(0);
 204       return PIPE_FORMAT_NONE;
 205    }
 206 }
 207
 208
 209 /**
 210  * Translate Gallium format to Mesa format.
 211  */
 212 gl_format
 213 st_pipe_format_to_mesa_format(enum pipe_format format)
 214 {
 215    switch (format) {
 216    case PIPE_FORMAT_A8B8G8R8_UNORM:
 217       return MESA_FORMAT_RGBA8888;
 218    case PIPE_FORMAT_R8G8B8A8_UNORM:
 219       return MESA_FORMAT_RGBA8888_REV;
 220    case PIPE_FORMAT_B8G8R8A8_UNORM:
 221       return MESA_FORMAT_ARGB8888;
 222    case PIPE_FORMAT_A8R8G8B8_UNORM:
 223       return MESA_FORMAT_ARGB8888_REV;
 224    case PIPE_FORMAT_B8G8R8X8_UNORM:
 225       return MESA_FORMAT_XRGB8888;
 226    case PIPE_FORMAT_X8R8G8B8_UNORM:
 227       return MESA_FORMAT_XRGB8888_REV;
 228    case PIPE_FORMAT_B5G5R5A1_UNORM:
 229       return MESA_FORMAT_ARGB1555;
 230    case PIPE_FORMAT_B4G4R4A4_UNORM:
 231       return MESA_FORMAT_ARGB4444;
 232    case PIPE_FORMAT_B5G6R5_UNORM:
 233       return MESA_FORMAT_RGB565;
 234    case PIPE_FORMAT_L8A8_UNORM:
 235       return MESA_FORMAT_AL88;
 236    case PIPE_FORMAT_A8_UNORM:
 237       return MESA_FORMAT_A8;
 238    case PIPE_FORMAT_L8_UNORM:
 239       return MESA_FORMAT_L8;
 240    case PIPE_FORMAT_I8_UNORM:
 241       return MESA_FORMAT_I8;
 242    case PIPE_FORMAT_S8_USCALED:
 243       return MESA_FORMAT_S8;
 244
 245    case PIPE_FORMAT_R16G16B16A16_SNORM:
 246       return MESA_FORMAT_SIGNED_RGBA_16;
 247
 248    case PIPE_FORMAT_Z16_UNORM:
 249       return MESA_FORMAT_Z16;
 250    case PIPE_FORMAT_Z32_UNORM:
 251       return MESA_FORMAT_Z32;
 252    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 253       return MESA_FORMAT_Z24_S8;
 254    case PIPE_FORMAT_X8Z24_UNORM:
 255       return MESA_FORMAT_Z24_X8;
 256    case PIPE_FORMAT_Z24X8_UNORM:
 257       return MESA_FORMAT_X8_Z24;
 258    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 259       return MESA_FORMAT_S8_Z24;
 260
 261    case PIPE_FORMAT_UYVY:
 262       return MESA_FORMAT_YCBCR;
 263    case PIPE_FORMAT_YUYV:
 264       return MESA_FORMAT_YCBCR_REV;
 265
 266 #if FEATURE_texture_s3tc
 267    case PIPE_FORMAT_DXT1_RGB:
 268       return MESA_FORMAT_RGB_DXT1;
 269    case PIPE_FORMAT_DXT1_RGBA:
 270       return MESA_FORMAT_RGBA_DXT1;
 271    case PIPE_FORMAT_DXT3_RGBA:
 272       return MESA_FORMAT_RGBA_DXT3;
 273    case PIPE_FORMAT_DXT5_RGBA:
 274       return MESA_FORMAT_RGBA_DXT5;
 275 #if FEATURE_EXT_texture_sRGB
 276    case PIPE_FORMAT_DXT1_SRGB:
 277       return MESA_FORMAT_SRGB_DXT1;
 278    case PIPE_FORMAT_DXT1_SRGBA:
 279       return MESA_FORMAT_SRGBA_DXT1;
 280    case PIPE_FORMAT_DXT3_SRGBA:
 281       return MESA_FORMAT_SRGBA_DXT3;
 282    case PIPE_FORMAT_DXT5_SRGBA:
 283       return MESA_FORMAT_SRGBA_DXT5;
 284 #endif
 285 #endif
 286
 287 #if FEATURE_EXT_texture_sRGB
 288    case PIPE_FORMAT_L8A8_SRGB:
 289       return MESA_FORMAT_SLA8;
 290    case PIPE_FORMAT_L8_SRGB:
 291       return MESA_FORMAT_SL8;
 292    case PIPE_FORMAT_R8G8B8_SRGB:
 293       return MESA_FORMAT_SRGB8;
 294    case PIPE_FORMAT_A8B8G8R8_SRGB:
 295       return MESA_FORMAT_SRGBA8;
 296    case PIPE_FORMAT_B8G8R8A8_SRGB:
 297       return MESA_FORMAT_SARGB8;
 298 #endif
 299    default:
 300       assert(0);
 301       return MESA_FORMAT_NONE;
 302    }
 303 }
 304
 305
 306 /**
 307  * Return first supported format from the given list.
 308  */
 309 static enum pipe_format
 310 find_supported_format(struct pipe_screen *screen,
 311                       const enum pipe_format formats[],
 312                       uint num_formats,
 313                       enum pipe_texture_target target,
 314                       unsigned tex_usage,
 315                       unsigned geom_flags)
 316 {
 317    uint i;
 318    for (i = 0; i < num_formats; i++) {
 319       if (screen->is_format_supported(screen, formats[i], target,
 320                                       tex_usage, geom_flags)) {
 321          return formats[i];
 322       }
 323    }
 324    return PIPE_FORMAT_NONE;
 325 }
 326
 327
 328 /**
 329  * Find an RGBA format supported by the context/winsys.
 330  */
 331 static enum pipe_format
 332 default_rgba_format(struct pipe_screen *screen,
 333                     enum pipe_texture_target target,
 334                     unsigned tex_usage,
 335                     unsigned geom_flags)
 336 {
 337    static const enum pipe_format colorFormats[] = {
 338       PIPE_FORMAT_B8G8R8A8_UNORM,
 339       PIPE_FORMAT_A8R8G8B8_UNORM,
 340       PIPE_FORMAT_A8B8G8R8_UNORM,
 341       PIPE_FORMAT_B5G6R5_UNORM
 342    };
 343    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 344                                 target, tex_usage, geom_flags);
 345 }
 346
 347
 348 /**
 349  * Find an RGB format supported by the context/winsys.
 350  */
 351 static enum pipe_format
 352 default_rgb_format(struct pipe_screen *screen,
 353                    enum pipe_texture_target target,
 354                    unsigned tex_usage,
 355                    unsigned geom_flags)
 356 {
 357    static const enum pipe_format colorFormats[] = {
 358       PIPE_FORMAT_B8G8R8X8_UNORM,
 359       PIPE_FORMAT_X8R8G8B8_UNORM,
 360       PIPE_FORMAT_X8B8G8R8_UNORM,
 361       PIPE_FORMAT_B8G8R8A8_UNORM,
 362       PIPE_FORMAT_A8R8G8B8_UNORM,
 363       PIPE_FORMAT_A8B8G8R8_UNORM,
 364       PIPE_FORMAT_B5G6R5_UNORM
 365    };
 366    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 367                                 target, tex_usage, geom_flags);
 368 }
 369
 370 /**
 371  * Find an sRGBA format supported by the context/winsys.
 372  */
 373 static enum pipe_format
 374 default_srgba_format(struct pipe_screen *screen,
 375                     enum pipe_texture_target target,
 376                     unsigned tex_usage,
 377                     unsigned geom_flags)
 378 {
 379    static const enum pipe_format colorFormats[] = {
 380       PIPE_FORMAT_B8G8R8A8_SRGB,
 381       PIPE_FORMAT_A8R8G8B8_SRGB,
 382       PIPE_FORMAT_A8B8G8R8_SRGB,
 383    };
 384    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 385                                 target, tex_usage, geom_flags);
 386 }
 387
 388
 389 /**
 390  * Given an OpenGL internalFormat value for a texture or surface, return
 391  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
 392  * \param target  one of PIPE_TEXTURE_x
 393  * \param tex_usage  either PIPE_BIND_RENDER_TARGET
 394  *                   or PIPE_BIND_SAMPLER_VIEW
 395  */
 396 enum pipe_format
 397 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 398                  enum pipe_texture_target target, unsigned tex_usage)
 399 {
 400    unsigned geom_flags = 0;
 401
 402    switch (internalFormat) {
 403    case 4:
 404    case GL_RGBA:
 405    case GL_RGBA8:
 406    case GL_RGB10_A2:
 407    case GL_RGBA12:
 408       return default_rgba_format( screen, target, tex_usage, geom_flags );
 409    case 3:
 410    case GL_RGB:
 411       return default_rgb_format( screen, target, tex_usage, geom_flags );
 412    case GL_RGBA16:
 413       return default_rgba_format( screen, target, tex_usage, geom_flags );
 414
 415    case GL_RGBA4:
 416    case GL_RGBA2:
 417       if (screen->is_format_supported( screen, PIPE_FORMAT_B4G4R4A4_UNORM, target, tex_usage, geom_flags ))
 418          return PIPE_FORMAT_B4G4R4A4_UNORM;
 419       return default_rgba_format( screen, target, tex_usage, geom_flags );
 420
 421    case GL_RGB5_A1:
 422       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM, target, tex_usage, geom_flags ))
 423          return PIPE_FORMAT_B5G5R5A1_UNORM;
 424       return default_rgba_format( screen, target, tex_usage, geom_flags );
 425
 426    case GL_RGB8:
 427    case GL_RGB10:
 428    case GL_RGB12:
 429    case GL_RGB16:
 430       return default_rgb_format( screen, target, tex_usage, geom_flags );
 431
 432    case GL_RGB5:
 433    case GL_RGB4:
 434    case GL_R3_G3_B2:
 435       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G6R5_UNORM, target, tex_usage, geom_flags ))
 436          return PIPE_FORMAT_B5G6R5_UNORM;
 437       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM, target, tex_usage, geom_flags ))
 438          return PIPE_FORMAT_B5G5R5A1_UNORM;
 439       return default_rgba_format( screen, target, tex_usage, geom_flags );
 440
 441    case GL_ALPHA:
 442    case GL_ALPHA4:
 443    case GL_ALPHA8:
 444    case GL_ALPHA12:
 445    case GL_ALPHA16:
 446    case GL_COMPRESSED_ALPHA:
 447       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target, tex_usage, geom_flags ))
 448          return PIPE_FORMAT_A8_UNORM;
 449       return default_rgba_format( screen, target, tex_usage, geom_flags );
 450
 451    case 1:
 452    case GL_LUMINANCE:
 453    case GL_LUMINANCE4:
 454    case GL_LUMINANCE8:
 455    case GL_LUMINANCE12:
 456    case GL_LUMINANCE16:
 457    case GL_COMPRESSED_LUMINANCE:
 458       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target, tex_usage, geom_flags ))
 459          return PIPE_FORMAT_L8_UNORM;
 460       return default_rgba_format( screen, target, tex_usage, geom_flags );
 461
 462    case 2:
 463    case GL_LUMINANCE_ALPHA:
 464    case GL_LUMINANCE4_ALPHA4:
 465    case GL_LUMINANCE6_ALPHA2:
 466    case GL_LUMINANCE8_ALPHA8:
 467    case GL_LUMINANCE12_ALPHA4:
 468    case GL_LUMINANCE12_ALPHA12:
 469    case GL_LUMINANCE16_ALPHA16:
 470    case GL_COMPRESSED_LUMINANCE_ALPHA:
 471       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target, tex_usage, geom_flags ))
 472          return PIPE_FORMAT_L8A8_UNORM;
 473       return default_rgba_format( screen, target, tex_usage, geom_flags );
 474
 475    case GL_INTENSITY:
 476    case GL_INTENSITY4:
 477    case GL_INTENSITY8:
 478    case GL_INTENSITY12:
 479    case GL_INTENSITY16:
 480    case GL_COMPRESSED_INTENSITY:
 481       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target, tex_usage, geom_flags ))
 482          return PIPE_FORMAT_I8_UNORM;
 483       return default_rgba_format( screen, target, tex_usage, geom_flags );
 484
 485    case GL_YCBCR_MESA:
 486       if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 487                                       target, tex_usage, geom_flags)) {
 488          return PIPE_FORMAT_UYVY;
 489       }
 490       if (screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 491                                       target, tex_usage, geom_flags)) {
 492          return PIPE_FORMAT_YUYV;
 493       }
 494       return PIPE_FORMAT_NONE;
 495
 496    case GL_COMPRESSED_RGB:
 497       /* can only sample from compressed formats */
 498       if (tex_usage & ~PIPE_BIND_SAMPLER_VIEW)
 499          return PIPE_FORMAT_NONE;
 500       else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGB,
 501                                            target, tex_usage, geom_flags))
 502          return PIPE_FORMAT_DXT1_RGB;
 503       else
 504          return default_rgb_format(screen, target, tex_usage, geom_flags);
 505
 506    case GL_COMPRESSED_RGBA:
 507       /* can only sample from compressed formats */
 508       if (tex_usage & ~PIPE_BIND_SAMPLER_VIEW)
 509          return PIPE_FORMAT_NONE;
 510       else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_RGBA,
 511                                            target, tex_usage, geom_flags))
 512          return PIPE_FORMAT_DXT3_RGBA;
 513       else
 514          return default_rgba_format(screen, target, tex_usage, geom_flags);
 515
 516    case GL_RGB_S3TC:
 517    case GL_RGB4_S3TC:
 518    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 519       return PIPE_FORMAT_DXT1_RGB;
 520
 521    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 522       return PIPE_FORMAT_DXT1_RGBA;
 523
 524    case GL_RGBA_S3TC:
 525    case GL_RGBA4_S3TC:
 526    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 527       return PIPE_FORMAT_DXT3_RGBA;
 528
 529    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 530       return PIPE_FORMAT_DXT5_RGBA;
 531
 532 #if 0
 533    case GL_COMPRESSED_RGB_FXT1_3DFX:
 534       return PIPE_FORMAT_RGB_FXT1;
 535    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 536       return PIPE_FORMAT_RGB_FXT1;
 537 #endif
 538
 539    case GL_DEPTH_COMPONENT16:
 540       if (screen->is_format_supported( screen, PIPE_FORMAT_Z16_UNORM, target, tex_usage, geom_flags ))
 541          return PIPE_FORMAT_Z16_UNORM;
 542       /* fall-through */
 543    case GL_DEPTH_COMPONENT24:
 544       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED, target, tex_usage, geom_flags ))
 545          return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 546       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM, target, tex_usage, geom_flags ))
 547          return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 548       /* fall-through */
 549    case GL_DEPTH_COMPONENT32:
 550       if (screen->is_format_supported( screen, PIPE_FORMAT_Z32_UNORM, target, tex_usage, geom_flags ))
 551          return PIPE_FORMAT_Z32_UNORM;
 552       /* fall-through */
 553    case GL_DEPTH_COMPONENT:
 554       {
 555          static const enum pipe_format formats[] = {
 556             PIPE_FORMAT_Z16_UNORM,
 557             PIPE_FORMAT_Z32_UNORM,
 558             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 559             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 560          };
 561          return find_supported_format(screen, formats, Elements(formats),
 562                                       target, tex_usage, geom_flags);
 563       }
 564
 565    case GL_STENCIL_INDEX:
 566    case GL_STENCIL_INDEX1_EXT:
 567    case GL_STENCIL_INDEX4_EXT:
 568    case GL_STENCIL_INDEX8_EXT:
 569    case GL_STENCIL_INDEX16_EXT:
 570       {
 571          static const enum pipe_format formats[] = {
 572             PIPE_FORMAT_S8_USCALED,
 573             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 574             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 575          };
 576          return find_supported_format(screen, formats, Elements(formats),
 577                                       target, tex_usage, geom_flags);
 578       }
 579
 580    case GL_DEPTH_STENCIL_EXT:
 581    case GL_DEPTH24_STENCIL8_EXT:
 582       {
 583          static const enum pipe_format formats[] = {
 584             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 585             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 586          };
 587          return find_supported_format(screen, formats, Elements(formats),
 588                                       target, tex_usage, geom_flags);
 589       }
 590
 591    case GL_SRGB_EXT:
 592    case GL_SRGB8_EXT:
 593    case GL_COMPRESSED_SRGB_EXT:
 594    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 595    case GL_SRGB_ALPHA_EXT:
 596    case GL_SRGB8_ALPHA8_EXT:
 597       return default_srgba_format( screen, target, tex_usage, geom_flags );
 598    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 599       return PIPE_FORMAT_DXT1_SRGB;
 600    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 601       return PIPE_FORMAT_DXT1_SRGBA;
 602    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 603       return PIPE_FORMAT_DXT3_SRGBA;
 604    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 605       return PIPE_FORMAT_DXT5_SRGBA;
 606
 607    case GL_SLUMINANCE_ALPHA_EXT:
 608    case GL_SLUMINANCE8_ALPHA8_EXT:
 609    case GL_COMPRESSED_SLUMINANCE_EXT:
 610    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 611       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_SRGB, target, tex_usage, geom_flags ))
 612          return PIPE_FORMAT_L8A8_SRGB;
 613       return default_srgba_format( screen, target, tex_usage, geom_flags );
 614
 615    case GL_SLUMINANCE_EXT:
 616    case GL_SLUMINANCE8_EXT:
 617       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_SRGB, target, tex_usage, geom_flags ))
 618          return PIPE_FORMAT_L8_SRGB;
 619       return default_srgba_format( screen, target, tex_usage, geom_flags );
 620
 621    default:
 622       return PIPE_FORMAT_NONE;
 623    }
 624 }
 625
 626
 627 static GLboolean
 628 is_depth_or_stencil_format(GLenum internalFormat)
 629 {
 630    switch (internalFormat) {
 631    case GL_DEPTH_COMPONENT:
 632    case GL_DEPTH_COMPONENT16:
 633    case GL_DEPTH_COMPONENT24:
 634    case GL_DEPTH_COMPONENT32:
 635    case GL_STENCIL_INDEX:
 636    case GL_STENCIL_INDEX1_EXT:
 637    case GL_STENCIL_INDEX4_EXT:
 638    case GL_STENCIL_INDEX8_EXT:
 639    case GL_STENCIL_INDEX16_EXT:
 640    case GL_DEPTH_STENCIL_EXT:
 641    case GL_DEPTH24_STENCIL8_EXT:
 642       return GL_TRUE;
 643    default:
 644       return GL_FALSE;
 645    }
 646 }
 647
 648 /**
 649  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 650  */
 651 enum pipe_format
 652 st_choose_renderbuffer_format(struct pipe_screen *screen,
 653                               GLenum internalFormat)
 654 {
 655    uint usage;
 656    if (is_depth_or_stencil_format(internalFormat))
 657       usage = PIPE_BIND_DEPTH_STENCIL;
 658    else
 659       usage = PIPE_BIND_RENDER_TARGET;
 660    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D, usage);
 661 }
 662
 663
 664 /**
 665  * Called via ctx->Driver.chooseTextureFormat().
 666  */
 667 gl_format
 668 st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 669                        GLenum format, GLenum type)
 670 {
 671    struct pipe_screen *screen = st_context(ctx)->pipe->screen;
 672    enum pipe_format pFormat;
 673    uint bindings;
 674
 675    (void) format;
 676    (void) type;
 677
 678    /* GL textures may wind up being render targets, but we don't know
 679     * that in advance.  Specify potential render target flags now.
 680     */
 681    if (_mesa_is_depth_format(internalFormat) ||
 682        _mesa_is_depthstencil_format(internalFormat))
 683       bindings = PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_DEPTH_STENCIL;
 684    else
 685       bindings = PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_RENDER_TARGET;
 686
 687    pFormat = st_choose_format(screen, internalFormat,
 688                               PIPE_TEXTURE_2D, bindings);
 689
 690    if (pFormat == PIPE_FORMAT_NONE) {
 691       /* try choosing format again, this time without render target bindings */
 692       pFormat = st_choose_format(screen, internalFormat,
 693                                  PIPE_TEXTURE_2D, PIPE_BIND_SAMPLER_VIEW);
 694    }
 695
 696    if (pFormat == PIPE_FORMAT_NONE) {
 697       /* no luck at all */
 698       return MESA_FORMAT_NONE;
 699    }
 700
 701    return st_pipe_format_to_mesa_format(pFormat);
 702 }
 703
 704
 705 /**
 706  * Test if a gallium format is equivalent to a GL format/type.
 707  */
 708 GLboolean
 709 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 710 {
 711    switch (pFormat) {
 712    case PIPE_FORMAT_A8B8G8R8_UNORM:
 713       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 714    case PIPE_FORMAT_A8R8G8B8_UNORM:
 715       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 716    case PIPE_FORMAT_B5G6R5_UNORM:
 717       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 718    /* XXX more combos... */
 719    default:
 720       return GL_FALSE;
 721    }
 722 }