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  * This is called during glTexImage2D, for example.
 393  *
 394  * The bindings parameter typically has PIPE_BIND_SAMPLER_VIEW set, plus
 395  * either PIPE_BINDING_RENDER_TARGET or PIPE_BINDING_DEPTH_STENCIL if
 396  * we want render-to-texture ability.
 397  *
 398  * \param internalFormat  the user value passed to glTexImage2D
 399  * \param target  one of PIPE_TEXTURE_x
 400  * \param bindings  bitmask of PIPE_BIND_x flags.
 401  */
 402 enum pipe_format
 403 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 404                  enum pipe_texture_target target, unsigned bindings)
 405 {
 406    unsigned geom_flags = 0; /* we don't care about POT vs. NPOT here, yet */
 407
 408    switch (internalFormat) {
 409    case 4:
 410    case GL_RGBA:
 411    case GL_RGBA8:
 412    case GL_RGB10_A2:
 413    case GL_RGBA12:
 414       return default_rgba_format( screen, target, bindings, geom_flags );
 415    case 3:
 416    case GL_RGB:
 417       return default_rgb_format( screen, target, bindings, geom_flags );
 418    case GL_RGBA16:
 419       return default_rgba_format( screen, target, bindings, geom_flags );
 420
 421    case GL_RGBA4:
 422    case GL_RGBA2:
 423       if (screen->is_format_supported( screen, PIPE_FORMAT_B4G4R4A4_UNORM,
 424                                        target, bindings, geom_flags ))
 425          return PIPE_FORMAT_B4G4R4A4_UNORM;
 426       return default_rgba_format( screen, target, bindings, geom_flags );
 427
 428    case GL_RGB5_A1:
 429       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM,
 430                                        target, bindings, geom_flags ))
 431          return PIPE_FORMAT_B5G5R5A1_UNORM;
 432       return default_rgba_format( screen, target, bindings, geom_flags );
 433
 434    case GL_RGB8:
 435    case GL_RGB10:
 436    case GL_RGB12:
 437    case GL_RGB16:
 438       return default_rgb_format( screen, target, bindings, geom_flags );
 439
 440    case GL_RGB5:
 441    case GL_RGB4:
 442    case GL_R3_G3_B2:
 443       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G6R5_UNORM,
 444                                        target, bindings, geom_flags ))
 445          return PIPE_FORMAT_B5G6R5_UNORM;
 446       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM,
 447                                        target, bindings, geom_flags ))
 448          return PIPE_FORMAT_B5G5R5A1_UNORM;
 449       return default_rgba_format( screen, target, bindings, geom_flags );
 450
 451    case GL_ALPHA:
 452    case GL_ALPHA4:
 453    case GL_ALPHA8:
 454    case GL_ALPHA12:
 455    case GL_ALPHA16:
 456    case GL_COMPRESSED_ALPHA:
 457       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target,
 458                                        bindings, geom_flags ))
 459          return PIPE_FORMAT_A8_UNORM;
 460       return default_rgba_format( screen, target, bindings, geom_flags );
 461
 462    case 1:
 463    case GL_LUMINANCE:
 464    case GL_LUMINANCE4:
 465    case GL_LUMINANCE8:
 466    case GL_LUMINANCE12:
 467    case GL_LUMINANCE16:
 468    case GL_COMPRESSED_LUMINANCE:
 469       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target,
 470                                        bindings, geom_flags ))
 471          return PIPE_FORMAT_L8_UNORM;
 472       return default_rgba_format( screen, target, bindings, geom_flags );
 473
 474    case 2:
 475    case GL_LUMINANCE_ALPHA:
 476    case GL_LUMINANCE4_ALPHA4:
 477    case GL_LUMINANCE6_ALPHA2:
 478    case GL_LUMINANCE8_ALPHA8:
 479    case GL_LUMINANCE12_ALPHA4:
 480    case GL_LUMINANCE12_ALPHA12:
 481    case GL_LUMINANCE16_ALPHA16:
 482    case GL_COMPRESSED_LUMINANCE_ALPHA:
 483       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target,
 484                                        bindings, geom_flags ))
 485          return PIPE_FORMAT_L8A8_UNORM;
 486       return default_rgba_format( screen, target, bindings, geom_flags );
 487
 488    case GL_INTENSITY:
 489    case GL_INTENSITY4:
 490    case GL_INTENSITY8:
 491    case GL_INTENSITY12:
 492    case GL_INTENSITY16:
 493    case GL_COMPRESSED_INTENSITY:
 494       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target,
 495                                        bindings, geom_flags ))
 496          return PIPE_FORMAT_I8_UNORM;
 497       return default_rgba_format( screen, target, bindings, geom_flags );
 498
 499    case GL_YCBCR_MESA:
 500       if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 501                                       target, bindings, geom_flags)) {
 502          return PIPE_FORMAT_UYVY;
 503       }
 504       if (screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 505                                       target, bindings, geom_flags)) {
 506          return PIPE_FORMAT_YUYV;
 507       }
 508       return PIPE_FORMAT_NONE;
 509
 510    case GL_COMPRESSED_RGB:
 511       /* can only sample from compressed formats */
 512       if (bindings & ~PIPE_BIND_SAMPLER_VIEW)
 513          return PIPE_FORMAT_NONE;
 514       else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGB,
 515                                            target, bindings, geom_flags))
 516          return PIPE_FORMAT_DXT1_RGB;
 517       else
 518          return default_rgb_format(screen, target, bindings, geom_flags);
 519
 520    case GL_COMPRESSED_RGBA:
 521       /* can only sample from compressed formats */
 522       if (bindings & ~PIPE_BIND_SAMPLER_VIEW)
 523          return PIPE_FORMAT_NONE;
 524       else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_RGBA,
 525                                            target, bindings, geom_flags))
 526          return PIPE_FORMAT_DXT3_RGBA;
 527       else
 528          return default_rgba_format(screen, target, bindings, geom_flags);
 529
 530    case GL_RGB_S3TC:
 531    case GL_RGB4_S3TC:
 532    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 533       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGB,
 534                                       target, bindings, geom_flags))
 535          return PIPE_FORMAT_DXT1_RGB;
 536       else
 537          return PIPE_FORMAT_NONE;
 538
 539    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 540       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGBA,
 541                                       target, bindings, geom_flags))
 542          return PIPE_FORMAT_DXT1_RGBA;
 543       else
 544          return PIPE_FORMAT_NONE;
 545
 546    case GL_RGBA_S3TC:
 547    case GL_RGBA4_S3TC:
 548    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 549       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_RGBA,
 550                                       target, bindings, geom_flags))
 551          return PIPE_FORMAT_DXT3_RGBA;
 552       else
 553          return PIPE_FORMAT_NONE;
 554
 555    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 556       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 557                                       target, bindings, geom_flags))
 558          return PIPE_FORMAT_DXT5_RGBA;
 559       else
 560          return PIPE_FORMAT_NONE;
 561
 562 #if 0
 563    case GL_COMPRESSED_RGB_FXT1_3DFX:
 564       return PIPE_FORMAT_RGB_FXT1;
 565    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 566       return PIPE_FORMAT_RGB_FXT1;
 567 #endif
 568
 569    case GL_DEPTH_COMPONENT16:
 570       if (screen->is_format_supported(screen, PIPE_FORMAT_Z16_UNORM, target,
 571                                       bindings, geom_flags))
 572          return PIPE_FORMAT_Z16_UNORM;
 573       /* fall-through */
 574    case GL_DEPTH_COMPONENT24:
 575       if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 576                                       target, bindings, geom_flags))
 577          return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 578       if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 579                                       target, bindings, geom_flags))
 580          return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 581       /* fall-through */
 582    case GL_DEPTH_COMPONENT32:
 583       if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_UNORM,
 584                                       target, bindings, geom_flags))
 585          return PIPE_FORMAT_Z32_UNORM;
 586       /* fall-through */
 587    case GL_DEPTH_COMPONENT:
 588       {
 589          static const enum pipe_format formats[] = {
 590             PIPE_FORMAT_Z16_UNORM,
 591             PIPE_FORMAT_Z32_UNORM,
 592             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 593             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 594          };
 595          return find_supported_format(screen, formats, Elements(formats),
 596                                       target, bindings, geom_flags);
 597       }
 598
 599    case GL_STENCIL_INDEX:
 600    case GL_STENCIL_INDEX1_EXT:
 601    case GL_STENCIL_INDEX4_EXT:
 602    case GL_STENCIL_INDEX8_EXT:
 603    case GL_STENCIL_INDEX16_EXT:
 604       {
 605          static const enum pipe_format formats[] = {
 606             PIPE_FORMAT_S8_USCALED,
 607             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 608             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 609          };
 610          return find_supported_format(screen, formats, Elements(formats),
 611                                       target, bindings, geom_flags);
 612       }
 613
 614    case GL_DEPTH_STENCIL_EXT:
 615    case GL_DEPTH24_STENCIL8_EXT:
 616       {
 617          static const enum pipe_format formats[] = {
 618             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 619             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 620          };
 621          return find_supported_format(screen, formats, Elements(formats),
 622                                       target, bindings, geom_flags);
 623       }
 624
 625    case GL_SRGB_EXT:
 626    case GL_SRGB8_EXT:
 627    case GL_COMPRESSED_SRGB_EXT:
 628    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 629    case GL_SRGB_ALPHA_EXT:
 630    case GL_SRGB8_ALPHA8_EXT:
 631       return default_srgba_format( screen, target, bindings, geom_flags );
 632    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 633       return PIPE_FORMAT_DXT1_SRGB;
 634    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 635       return PIPE_FORMAT_DXT1_SRGBA;
 636    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 637       return PIPE_FORMAT_DXT3_SRGBA;
 638    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 639       return PIPE_FORMAT_DXT5_SRGBA;
 640
 641    case GL_SLUMINANCE_ALPHA_EXT:
 642    case GL_SLUMINANCE8_ALPHA8_EXT:
 643    case GL_COMPRESSED_SLUMINANCE_EXT:
 644    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 645       if (screen->is_format_supported(screen, PIPE_FORMAT_L8A8_SRGB,
 646                                       target, bindings, geom_flags))
 647          return PIPE_FORMAT_L8A8_SRGB;
 648       return default_srgba_format( screen, target, bindings, geom_flags );
 649
 650    case GL_SLUMINANCE_EXT:
 651    case GL_SLUMINANCE8_EXT:
 652       if (screen->is_format_supported(screen, PIPE_FORMAT_L8_SRGB,
 653                                       target, bindings, geom_flags))
 654          return PIPE_FORMAT_L8_SRGB;
 655       return default_srgba_format( screen, target, bindings, geom_flags );
 656
 657    default:
 658       return PIPE_FORMAT_NONE;
 659    }
 660 }
 661
 662
 663 /**
 664  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 665  */
 666 enum pipe_format
 667 st_choose_renderbuffer_format(struct pipe_screen *screen,
 668                               GLenum internalFormat)
 669 {
 670    uint usage;
 671    if (_mesa_is_depth_or_stencil_format(internalFormat))
 672       usage = PIPE_BIND_DEPTH_STENCIL;
 673    else
 674       usage = PIPE_BIND_RENDER_TARGET;
 675    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D, usage);
 676 }
 677
 678
 679 /**
 680  * Called via ctx->Driver.chooseTextureFormat().
 681  */
 682 gl_format
 683 st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 684                        GLenum format, GLenum type)
 685 {
 686    struct pipe_screen *screen = st_context(ctx)->pipe->screen;
 687    enum pipe_format pFormat;
 688    uint bindings;
 689
 690    (void) format;
 691    (void) type;
 692
 693    /* GL textures may wind up being render targets, but we don't know
 694     * that in advance.  Specify potential render target flags now.
 695     */
 696    if (_mesa_is_depth_format(internalFormat) ||
 697        _mesa_is_depthstencil_format(internalFormat))
 698       bindings = PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_DEPTH_STENCIL;
 699    else
 700       bindings = PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_RENDER_TARGET;
 701
 702    pFormat = st_choose_format(screen, internalFormat,
 703                               PIPE_TEXTURE_2D, bindings);
 704
 705    if (pFormat == PIPE_FORMAT_NONE) {
 706       /* try choosing format again, this time without render target bindings */
 707       pFormat = st_choose_format(screen, internalFormat,
 708                                  PIPE_TEXTURE_2D, PIPE_BIND_SAMPLER_VIEW);
 709    }
 710
 711    if (pFormat == PIPE_FORMAT_NONE) {
 712       /* no luck at all */
 713       return MESA_FORMAT_NONE;
 714    }
 715
 716    return st_pipe_format_to_mesa_format(pFormat);
 717 }
 718
 719
 720 /**
 721  * Test if a gallium format is equivalent to a GL format/type.
 722  */
 723 GLboolean
 724 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 725 {
 726    switch (pFormat) {
 727    case PIPE_FORMAT_A8B8G8R8_UNORM:
 728       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 729    case PIPE_FORMAT_A8R8G8B8_UNORM:
 730       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 731    case PIPE_FORMAT_B5G6R5_UNORM:
 732       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 733    /* XXX more combos... */
 734    default:
 735       return GL_FALSE;
 736    }
 737 }