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       /* fix this */
 130    case MESA_FORMAT_ARGB8888_REV:
 131    case MESA_FORMAT_ARGB8888:
 132       return PIPE_FORMAT_B8G8R8A8_UNORM;
 133    case MESA_FORMAT_XRGB8888:
 134       return PIPE_FORMAT_B8G8R8X8_UNORM;
 135    case MESA_FORMAT_ARGB1555:
 136       return PIPE_FORMAT_B5G5R5A1_UNORM;
 137    case MESA_FORMAT_ARGB4444:
 138       return PIPE_FORMAT_B4G4R4A4_UNORM;
 139    case MESA_FORMAT_RGB565:
 140       return PIPE_FORMAT_B5G6R5_UNORM;
 141    case MESA_FORMAT_AL88:
 142       return PIPE_FORMAT_L8A8_UNORM;
 143    case MESA_FORMAT_A8:
 144       return PIPE_FORMAT_A8_UNORM;
 145    case MESA_FORMAT_L8:
 146       return PIPE_FORMAT_L8_UNORM;
 147    case MESA_FORMAT_I8:
 148       return PIPE_FORMAT_I8_UNORM;
 149    case MESA_FORMAT_Z16:
 150       return PIPE_FORMAT_Z16_UNORM;
 151    case MESA_FORMAT_Z32:
 152       return PIPE_FORMAT_Z32_UNORM;
 153    case MESA_FORMAT_Z24_S8:
 154       return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 155    case MESA_FORMAT_S8_Z24:
 156       return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 157    case MESA_FORMAT_YCBCR:
 158       return PIPE_FORMAT_UYVY;
 159 #if FEATURE_texture_s3tc
 160    case MESA_FORMAT_RGB_DXT1:
 161       return PIPE_FORMAT_DXT1_RGB;
 162    case MESA_FORMAT_RGBA_DXT1:
 163       return PIPE_FORMAT_DXT1_RGBA;
 164    case MESA_FORMAT_RGBA_DXT3:
 165       return PIPE_FORMAT_DXT3_RGBA;
 166    case MESA_FORMAT_RGBA_DXT5:
 167       return PIPE_FORMAT_DXT5_RGBA;
 168 #if FEATURE_EXT_texture_sRGB
 169    case MESA_FORMAT_SRGB_DXT1:
 170       return PIPE_FORMAT_DXT1_SRGB;
 171    case MESA_FORMAT_SRGBA_DXT1:
 172       return PIPE_FORMAT_DXT1_SRGBA;
 173    case MESA_FORMAT_SRGBA_DXT3:
 174       return PIPE_FORMAT_DXT3_SRGBA;
 175    case MESA_FORMAT_SRGBA_DXT5:
 176       return PIPE_FORMAT_DXT5_SRGBA;
 177 #endif
 178 #endif
 179 #if FEATURE_EXT_texture_sRGB
 180    case MESA_FORMAT_SLA8:
 181       return PIPE_FORMAT_L8A8_SRGB;
 182    case MESA_FORMAT_SL8:
 183       return PIPE_FORMAT_L8_SRGB;
 184    case MESA_FORMAT_SRGB8:
 185       return PIPE_FORMAT_R8G8B8_SRGB;
 186    case MESA_FORMAT_SRGBA8:
 187       return PIPE_FORMAT_A8B8G8R8_SRGB;
 188    case MESA_FORMAT_SARGB8:
 189       return PIPE_FORMAT_B8G8R8A8_SRGB;
 190 #endif
 191    default:
 192       assert(0);
 193       return 0;
 194    }
 195 }
 196
 197
 198 /**
 199  * Translate Gallium format to Mesa format.
 200  */
 201 gl_format
 202 st_pipe_format_to_mesa_format(enum pipe_format format)
 203 {
 204    switch (format) {
 205    case PIPE_FORMAT_B8G8R8A8_UNORM:
 206       return MESA_FORMAT_ARGB8888;
 207    case PIPE_FORMAT_B8G8R8X8_UNORM:
 208       return MESA_FORMAT_XRGB8888;
 209    case PIPE_FORMAT_A8R8G8B8_UNORM:
 210       return MESA_FORMAT_ARGB8888_REV;
 211    case PIPE_FORMAT_X8R8G8B8_UNORM:
 212       return MESA_FORMAT_XRGB8888_REV;
 213    case PIPE_FORMAT_B5G5R5A1_UNORM:
 214       return MESA_FORMAT_ARGB1555;
 215    case PIPE_FORMAT_B4G4R4A4_UNORM:
 216       return MESA_FORMAT_ARGB4444;
 217    case PIPE_FORMAT_B5G6R5_UNORM:
 218       return MESA_FORMAT_RGB565;
 219    case PIPE_FORMAT_L8A8_UNORM:
 220       return MESA_FORMAT_AL88;
 221    case PIPE_FORMAT_A8_UNORM:
 222       return MESA_FORMAT_A8;
 223    case PIPE_FORMAT_L8_UNORM:
 224       return MESA_FORMAT_L8;
 225    case PIPE_FORMAT_I8_UNORM:
 226       return MESA_FORMAT_I8;
 227    case PIPE_FORMAT_S8_USCALED:
 228       return MESA_FORMAT_S8;
 229
 230    case PIPE_FORMAT_R16G16B16A16_SNORM:
 231       return MESA_FORMAT_SIGNED_RGBA_16;
 232
 233    case PIPE_FORMAT_Z16_UNORM:
 234       return MESA_FORMAT_Z16;
 235    case PIPE_FORMAT_Z32_UNORM:
 236       return MESA_FORMAT_Z32;
 237    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 238       return MESA_FORMAT_Z24_S8;
 239    case PIPE_FORMAT_X8Z24_UNORM:
 240       return MESA_FORMAT_Z24_X8;
 241    case PIPE_FORMAT_Z24X8_UNORM:
 242       return MESA_FORMAT_X8_Z24;
 243    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 244       return MESA_FORMAT_S8_Z24;
 245
 246    case PIPE_FORMAT_UYVY:
 247       return MESA_FORMAT_YCBCR;
 248    case PIPE_FORMAT_YUYV:
 249       return MESA_FORMAT_YCBCR_REV;
 250
 251 #if FEATURE_texture_s3tc
 252    case PIPE_FORMAT_DXT1_RGB:
 253       return MESA_FORMAT_RGB_DXT1;
 254    case PIPE_FORMAT_DXT1_RGBA:
 255       return MESA_FORMAT_RGBA_DXT1;
 256    case PIPE_FORMAT_DXT3_RGBA:
 257       return MESA_FORMAT_RGBA_DXT3;
 258    case PIPE_FORMAT_DXT5_RGBA:
 259       return MESA_FORMAT_RGBA_DXT5;
 260 #if FEATURE_EXT_texture_sRGB
 261    case PIPE_FORMAT_DXT1_SRGB:
 262       return MESA_FORMAT_SRGB_DXT1;
 263    case PIPE_FORMAT_DXT1_SRGBA:
 264       return MESA_FORMAT_SRGBA_DXT1;
 265    case PIPE_FORMAT_DXT3_SRGBA:
 266       return MESA_FORMAT_SRGBA_DXT3;
 267    case PIPE_FORMAT_DXT5_SRGBA:
 268       return MESA_FORMAT_SRGBA_DXT5;
 269 #endif
 270 #endif
 271
 272 #if FEATURE_EXT_texture_sRGB
 273    case PIPE_FORMAT_L8A8_SRGB:
 274       return MESA_FORMAT_SLA8;
 275    case PIPE_FORMAT_L8_SRGB:
 276       return MESA_FORMAT_SL8;
 277    case PIPE_FORMAT_R8G8B8_SRGB:
 278       return MESA_FORMAT_SRGB8;
 279    case PIPE_FORMAT_A8B8G8R8_SRGB:
 280       return MESA_FORMAT_SRGBA8;
 281    case PIPE_FORMAT_B8G8R8A8_SRGB:
 282       return MESA_FORMAT_SARGB8;
 283 #endif
 284    default:
 285       assert(0);
 286       return MESA_FORMAT_NONE;
 287    }
 288 }
 289
 290
 291 /**
 292  * Find an RGBA format supported by the context/winsys.
 293  */
 294 static enum pipe_format
 295 default_rgba_format(struct pipe_screen *screen,
 296                     enum pipe_texture_target target,
 297                     unsigned tex_usage,
 298                     unsigned geom_flags)
 299 {
 300    static const enum pipe_format colorFormats[] = {
 301       PIPE_FORMAT_B8G8R8A8_UNORM,
 302       PIPE_FORMAT_A8R8G8B8_UNORM,
 303       PIPE_FORMAT_A8B8G8R8_UNORM,
 304       PIPE_FORMAT_B5G6R5_UNORM
 305    };
 306    uint i;
 307    for (i = 0; i < Elements(colorFormats); i++) {
 308       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 309          return colorFormats[i];
 310       }
 311    }
 312    return PIPE_FORMAT_NONE;
 313 }
 314
 315 /**
 316  * Find an RGB format supported by the context/winsys.
 317  */
 318 static enum pipe_format
 319 default_rgb_format(struct pipe_screen *screen,
 320                    enum pipe_texture_target target,
 321                    unsigned tex_usage,
 322                    unsigned geom_flags)
 323 {
 324    static const enum pipe_format colorFormats[] = {
 325       PIPE_FORMAT_B8G8R8X8_UNORM,
 326       PIPE_FORMAT_X8R8G8B8_UNORM,
 327       PIPE_FORMAT_X8B8G8R8_UNORM,
 328       PIPE_FORMAT_B8G8R8A8_UNORM,
 329       PIPE_FORMAT_A8R8G8B8_UNORM,
 330       PIPE_FORMAT_A8B8G8R8_UNORM,
 331       PIPE_FORMAT_B5G6R5_UNORM
 332    };
 333    uint i;
 334    for (i = 0; i < Elements(colorFormats); i++) {
 335       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 336          return colorFormats[i];
 337       }
 338    }
 339    return PIPE_FORMAT_NONE;
 340 }
 341
 342 /**
 343  * Find an sRGBA format supported by the context/winsys.
 344  */
 345 static enum pipe_format
 346 default_srgba_format(struct pipe_screen *screen,
 347                     enum pipe_texture_target target,
 348                     unsigned tex_usage,
 349                     unsigned geom_flags)
 350 {
 351    static const enum pipe_format colorFormats[] = {
 352       PIPE_FORMAT_B8G8R8A8_SRGB,
 353       PIPE_FORMAT_A8R8G8B8_SRGB,
 354       PIPE_FORMAT_A8B8G8R8_SRGB,
 355    };
 356    uint i;
 357    for (i = 0; i < Elements(colorFormats); i++) {
 358       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 359          return colorFormats[i];
 360       }
 361    }
 362    return PIPE_FORMAT_NONE;
 363 }
 364
 365 /**
 366  * Search list of formats for first RGBA format with >8 bits/channel.
 367  */
 368 static enum pipe_format
 369 default_deep_rgba_format(struct pipe_screen *screen,
 370                          enum pipe_texture_target target,
 371                          unsigned tex_usage,
 372                          unsigned geom_flags)
 373 {
 374    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM, target, tex_usage, geom_flags)) {
 375       return PIPE_FORMAT_R16G16B16A16_SNORM;
 376    }
 377    if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 378       return default_rgba_format(screen, target, tex_usage, geom_flags);
 379    else
 380       return PIPE_FORMAT_NONE;
 381 }
 382
 383
 384 /**
 385  * Find an Z format supported by the context/winsys.
 386  */
 387 static enum pipe_format
 388 default_depth_format(struct pipe_screen *screen,
 389                      enum pipe_texture_target target,
 390                      unsigned tex_usage,
 391                      unsigned geom_flags)
 392 {
 393    static const enum pipe_format zFormats[] = {
 394       PIPE_FORMAT_Z16_UNORM,
 395       PIPE_FORMAT_Z32_UNORM,
 396       PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 397       PIPE_FORMAT_S8_USCALED_Z24_UNORM
 398    };
 399    uint i;
 400    for (i = 0; i < Elements(zFormats); i++) {
 401       if (screen->is_format_supported( screen, zFormats[i], target, tex_usage, geom_flags )) {
 402          return zFormats[i];
 403       }
 404    }
 405    return PIPE_FORMAT_NONE;
 406 }
 407
 408
 409 /**
 410  * Given an OpenGL internalFormat value for a texture or surface, return
 411  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
 412  * \param target  one of PIPE_TEXTURE_x
 413  * \param tex_usage  either PIPE_TEXTURE_USAGE_RENDER_TARGET
 414  *                   or PIPE_TEXTURE_USAGE_SAMPLER
 415  */
 416 enum pipe_format
 417 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 418                  enum pipe_texture_target target, unsigned tex_usage)
 419 {
 420    unsigned geom_flags = 0;
 421
 422    switch (internalFormat) {
 423    case 4:
 424    case GL_RGBA:
 425    case GL_COMPRESSED_RGBA:
 426    case GL_RGBA8:
 427    case GL_RGB10_A2:
 428    case GL_RGBA12:
 429       return default_rgba_format( screen, target, tex_usage, geom_flags );
 430    case 3:
 431    case GL_RGB:
 432    case GL_COMPRESSED_RGB:
 433       return default_rgb_format( screen, target, tex_usage, geom_flags );
 434    case GL_RGBA16:
 435       if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 436          return default_deep_rgba_format( screen, target, tex_usage, geom_flags );
 437       else
 438          return default_rgba_format( screen, target, tex_usage, geom_flags );
 439
 440    case GL_RGBA4:
 441    case GL_RGBA2:
 442       if (screen->is_format_supported( screen, PIPE_FORMAT_B4G4R4A4_UNORM, target, tex_usage, geom_flags ))
 443          return PIPE_FORMAT_B4G4R4A4_UNORM;
 444       return default_rgba_format( screen, target, tex_usage, geom_flags );
 445
 446    case GL_RGB5_A1:
 447       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM, target, tex_usage, geom_flags ))
 448          return PIPE_FORMAT_B5G5R5A1_UNORM;
 449       return default_rgba_format( screen, target, tex_usage, geom_flags );
 450
 451    case GL_RGB8:
 452    case GL_RGB10:
 453    case GL_RGB12:
 454    case GL_RGB16:
 455       return default_rgb_format( screen, target, tex_usage, geom_flags );
 456
 457    case GL_RGB5:
 458    case GL_RGB4:
 459    case GL_R3_G3_B2:
 460       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G6R5_UNORM, target, tex_usage, geom_flags ))
 461          return PIPE_FORMAT_B5G6R5_UNORM;
 462       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM, target, tex_usage, geom_flags ))
 463          return PIPE_FORMAT_B5G5R5A1_UNORM;
 464       return default_rgba_format( screen, target, tex_usage, geom_flags );
 465
 466    case GL_ALPHA:
 467    case GL_ALPHA4:
 468    case GL_ALPHA8:
 469    case GL_ALPHA12:
 470    case GL_ALPHA16:
 471    case GL_COMPRESSED_ALPHA:
 472       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target, tex_usage, geom_flags ))
 473          return PIPE_FORMAT_A8_UNORM;
 474       return default_rgba_format( screen, target, tex_usage, geom_flags );
 475
 476    case 1:
 477    case GL_LUMINANCE:
 478    case GL_LUMINANCE4:
 479    case GL_LUMINANCE8:
 480    case GL_LUMINANCE12:
 481    case GL_LUMINANCE16:
 482    case GL_COMPRESSED_LUMINANCE:
 483       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target, tex_usage, geom_flags ))
 484          return PIPE_FORMAT_L8_UNORM;
 485       return default_rgba_format( screen, target, tex_usage, geom_flags );
 486
 487    case 2:
 488    case GL_LUMINANCE_ALPHA:
 489    case GL_LUMINANCE4_ALPHA4:
 490    case GL_LUMINANCE6_ALPHA2:
 491    case GL_LUMINANCE8_ALPHA8:
 492    case GL_LUMINANCE12_ALPHA4:
 493    case GL_LUMINANCE12_ALPHA12:
 494    case GL_LUMINANCE16_ALPHA16:
 495    case GL_COMPRESSED_LUMINANCE_ALPHA:
 496       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target, tex_usage, geom_flags ))
 497          return PIPE_FORMAT_L8A8_UNORM;
 498       return default_rgba_format( screen, target, tex_usage, geom_flags );
 499
 500    case GL_INTENSITY:
 501    case GL_INTENSITY4:
 502    case GL_INTENSITY8:
 503    case GL_INTENSITY12:
 504    case GL_INTENSITY16:
 505    case GL_COMPRESSED_INTENSITY:
 506       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target, tex_usage, geom_flags ))
 507          return PIPE_FORMAT_I8_UNORM;
 508       return default_rgba_format( screen, target, tex_usage, geom_flags );
 509
 510    case GL_YCBCR_MESA:
 511       if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 512                                       target, tex_usage, geom_flags)) {
 513          return PIPE_FORMAT_UYVY;
 514       }
 515       if (screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 516                                       target, tex_usage, geom_flags)) {
 517          return PIPE_FORMAT_YUYV;
 518       }
 519       return PIPE_FORMAT_NONE;
 520
 521    case GL_RGB_S3TC:
 522    case GL_RGB4_S3TC:
 523    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 524       return PIPE_FORMAT_DXT1_RGB;
 525
 526    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 527       return PIPE_FORMAT_DXT1_RGBA;
 528
 529    case GL_RGBA_S3TC:
 530    case GL_RGBA4_S3TC:
 531    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 532       return PIPE_FORMAT_DXT3_RGBA;
 533
 534    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 535       return PIPE_FORMAT_DXT5_RGBA;
 536
 537 #if 0
 538    case GL_COMPRESSED_RGB_FXT1_3DFX:
 539       return PIPE_FORMAT_RGB_FXT1;
 540    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 541       return PIPE_FORMAT_RGB_FXT1;
 542 #endif
 543
 544    case GL_DEPTH_COMPONENT16:
 545       if (screen->is_format_supported( screen, PIPE_FORMAT_Z16_UNORM, target, tex_usage, geom_flags ))
 546          return PIPE_FORMAT_Z16_UNORM;
 547       /* fall-through */
 548    case GL_DEPTH_COMPONENT24:
 549       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED, target, tex_usage, geom_flags ))
 550          return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 551       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM, target, tex_usage, geom_flags ))
 552          return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 553       /* fall-through */
 554    case GL_DEPTH_COMPONENT32:
 555       if (screen->is_format_supported( screen, PIPE_FORMAT_Z32_UNORM, target, tex_usage, geom_flags ))
 556          return PIPE_FORMAT_Z32_UNORM;
 557       /* fall-through */
 558    case GL_DEPTH_COMPONENT:
 559       return default_depth_format( screen, target, tex_usage, geom_flags );
 560
 561    case GL_STENCIL_INDEX:
 562    case GL_STENCIL_INDEX1_EXT:
 563    case GL_STENCIL_INDEX4_EXT:
 564    case GL_STENCIL_INDEX8_EXT:
 565    case GL_STENCIL_INDEX16_EXT:
 566       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_USCALED, target, tex_usage, geom_flags ))
 567          return PIPE_FORMAT_S8_USCALED;
 568       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED, target, tex_usage, geom_flags ))
 569          return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 570       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM, target, tex_usage, geom_flags ))
 571          return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 572       return PIPE_FORMAT_NONE;
 573
 574    case GL_DEPTH_STENCIL_EXT:
 575    case GL_DEPTH24_STENCIL8_EXT:
 576       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED, target, tex_usage, geom_flags ))
 577          return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 578       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM, target, tex_usage, geom_flags ))
 579          return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 580       return PIPE_FORMAT_NONE;
 581
 582    case GL_SRGB_EXT:
 583    case GL_SRGB8_EXT:
 584    case GL_COMPRESSED_SRGB_EXT:
 585    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 586    case GL_SRGB_ALPHA_EXT:
 587    case GL_SRGB8_ALPHA8_EXT:
 588       return default_srgba_format( screen, target, tex_usage, geom_flags );
 589    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 590       return PIPE_FORMAT_DXT1_SRGB;
 591    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 592       return PIPE_FORMAT_DXT1_SRGBA;
 593    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 594       return PIPE_FORMAT_DXT3_SRGBA;
 595    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 596       return PIPE_FORMAT_DXT5_SRGBA;
 597
 598    case GL_SLUMINANCE_ALPHA_EXT:
 599    case GL_SLUMINANCE8_ALPHA8_EXT:
 600    case GL_COMPRESSED_SLUMINANCE_EXT:
 601    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 602       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_SRGB, target, tex_usage, geom_flags ))
 603          return PIPE_FORMAT_L8A8_SRGB;
 604       return default_srgba_format( screen, target, tex_usage, geom_flags );
 605
 606    case GL_SLUMINANCE_EXT:
 607    case GL_SLUMINANCE8_EXT:
 608       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_SRGB, target, tex_usage, geom_flags ))
 609          return PIPE_FORMAT_L8_SRGB;
 610       return default_srgba_format( screen, target, tex_usage, geom_flags );
 611
 612    default:
 613       return PIPE_FORMAT_NONE;
 614    }
 615 }
 616
 617
 618 static GLboolean
 619 is_depth_or_stencil_format(GLenum internalFormat)
 620 {
 621    switch (internalFormat) {
 622    case GL_DEPTH_COMPONENT:
 623    case GL_DEPTH_COMPONENT16:
 624    case GL_DEPTH_COMPONENT24:
 625    case GL_DEPTH_COMPONENT32:
 626    case GL_STENCIL_INDEX:
 627    case GL_STENCIL_INDEX1_EXT:
 628    case GL_STENCIL_INDEX4_EXT:
 629    case GL_STENCIL_INDEX8_EXT:
 630    case GL_STENCIL_INDEX16_EXT:
 631    case GL_DEPTH_STENCIL_EXT:
 632    case GL_DEPTH24_STENCIL8_EXT:
 633       return GL_TRUE;
 634    default:
 635       return GL_FALSE;
 636    }
 637 }
 638
 639 /**
 640  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 641  */
 642 enum pipe_format
 643 st_choose_renderbuffer_format(struct pipe_screen *screen,
 644                               GLenum internalFormat)
 645 {
 646    uint usage;
 647    if (is_depth_or_stencil_format(internalFormat))
 648       usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
 649    else
 650       usage = PIPE_TEXTURE_USAGE_RENDER_TARGET;
 651    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D, usage);
 652 }
 653
 654
 655 /**
 656  * Called via ctx->Driver.chooseTextureFormat().
 657  */
 658 gl_format
 659 st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 660                        GLenum format, GLenum type)
 661 {
 662    enum pipe_format pFormat;
 663
 664    (void) format;
 665    (void) type;
 666
 667    pFormat = st_choose_format(ctx->st->pipe->screen, internalFormat,
 668                               PIPE_TEXTURE_2D, PIPE_TEXTURE_USAGE_SAMPLER);
 669    if (pFormat == PIPE_FORMAT_NONE)
 670       return MESA_FORMAT_NONE;
 671
 672    return st_pipe_format_to_mesa_format(pFormat);
 673 }
 674
 675
 676 /**
 677  * Test if a gallium format is equivalent to a GL format/type.
 678  */
 679 GLboolean
 680 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 681 {
 682    switch (pFormat) {
 683    case PIPE_FORMAT_A8B8G8R8_UNORM:
 684       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 685    case PIPE_FORMAT_A8R8G8B8_UNORM:
 686       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 687    case PIPE_FORMAT_B5G6R5_UNORM:
 688       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 689    /* XXX more combos... */
 690    default:
 691       return GL_FALSE;
 692    }
 693 }