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_Z24S8_UNORM ||
  80                format == PIPE_FORMAT_S8Z24_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_S8Z24_UNORM;
 155    case MESA_FORMAT_S8_Z24:
 156       return PIPE_FORMAT_Z24S8_UNORM;
 157    case MESA_FORMAT_Z24_X8:
 158       return PIPE_FORMAT_X8Z24_UNORM;
 159    case MESA_FORMAT_X8_Z24:
 160       return PIPE_FORMAT_Z24X8_UNORM;
 161    case MESA_FORMAT_YCBCR:
 162       return PIPE_FORMAT_UYVY;
 163 #if FEATURE_texture_s3tc
 164    case MESA_FORMAT_RGB_DXT1:
 165       return PIPE_FORMAT_DXT1_RGB;
 166    case MESA_FORMAT_RGBA_DXT1:
 167       return PIPE_FORMAT_DXT1_RGBA;
 168    case MESA_FORMAT_RGBA_DXT3:
 169       return PIPE_FORMAT_DXT3_RGBA;
 170    case MESA_FORMAT_RGBA_DXT5:
 171       return PIPE_FORMAT_DXT5_RGBA;
 172 #if FEATURE_EXT_texture_sRGB
 173    case MESA_FORMAT_SRGB_DXT1:
 174       return PIPE_FORMAT_DXT1_SRGB;
 175    case MESA_FORMAT_SRGBA_DXT1:
 176       return PIPE_FORMAT_DXT1_SRGBA;
 177    case MESA_FORMAT_SRGBA_DXT3:
 178       return PIPE_FORMAT_DXT3_SRGBA;
 179    case MESA_FORMAT_SRGBA_DXT5:
 180       return PIPE_FORMAT_DXT5_SRGBA;
 181 #endif
 182 #endif
 183 #if FEATURE_EXT_texture_sRGB
 184    case MESA_FORMAT_SLA8:
 185       return PIPE_FORMAT_L8A8_SRGB;
 186    case MESA_FORMAT_SL8:
 187       return PIPE_FORMAT_L8_SRGB;
 188    case MESA_FORMAT_SRGB8:
 189       return PIPE_FORMAT_R8G8B8_SRGB;
 190    case MESA_FORMAT_SRGBA8:
 191       return PIPE_FORMAT_A8B8G8R8_SRGB;
 192    case MESA_FORMAT_SARGB8:
 193       return PIPE_FORMAT_B8G8R8A8_SRGB;
 194 #endif
 195    default:
 196       assert(0);
 197       return 0;
 198    }
 199 }
 200
 201
 202 /**
 203  * Translate Gallium format to Mesa format.
 204  */
 205 gl_format
 206 st_pipe_format_to_mesa_format(enum pipe_format format)
 207 {
 208    switch (format) {
 209    case PIPE_FORMAT_B8G8R8A8_UNORM:
 210       return MESA_FORMAT_ARGB8888;
 211    case PIPE_FORMAT_B8G8R8X8_UNORM:
 212       return MESA_FORMAT_XRGB8888;
 213    case PIPE_FORMAT_A8R8G8B8_UNORM:
 214       return MESA_FORMAT_ARGB8888_REV;
 215    case PIPE_FORMAT_X8R8G8B8_UNORM:
 216       return MESA_FORMAT_XRGB8888_REV;
 217    case PIPE_FORMAT_B5G5R5A1_UNORM:
 218       return MESA_FORMAT_ARGB1555;
 219    case PIPE_FORMAT_B4G4R4A4_UNORM:
 220       return MESA_FORMAT_ARGB4444;
 221    case PIPE_FORMAT_B5G6R5_UNORM:
 222       return MESA_FORMAT_RGB565;
 223    case PIPE_FORMAT_L8A8_UNORM:
 224       return MESA_FORMAT_AL88;
 225    case PIPE_FORMAT_A8_UNORM:
 226       return MESA_FORMAT_A8;
 227    case PIPE_FORMAT_L8_UNORM:
 228       return MESA_FORMAT_L8;
 229    case PIPE_FORMAT_I8_UNORM:
 230       return MESA_FORMAT_I8;
 231    case PIPE_FORMAT_S8_UNORM:
 232       return MESA_FORMAT_S8;
 233
 234    case PIPE_FORMAT_R16G16B16A16_SNORM:
 235       return MESA_FORMAT_SIGNED_RGBA_16;
 236
 237    case PIPE_FORMAT_Z16_UNORM:
 238       return MESA_FORMAT_Z16;
 239    case PIPE_FORMAT_Z32_UNORM:
 240       return MESA_FORMAT_Z32;
 241    case PIPE_FORMAT_S8Z24_UNORM:
 242       return MESA_FORMAT_Z24_S8;
 243    case PIPE_FORMAT_X8Z24_UNORM:
 244       return MESA_FORMAT_Z24_X8;
 245    case PIPE_FORMAT_Z24X8_UNORM:
 246       return MESA_FORMAT_X8_Z24;
 247    case PIPE_FORMAT_Z24S8_UNORM:
 248       return MESA_FORMAT_S8_Z24;
 249
 250    case PIPE_FORMAT_UYVY:
 251       return MESA_FORMAT_YCBCR;
 252    case PIPE_FORMAT_YUYV:
 253       return MESA_FORMAT_YCBCR_REV;
 254
 255 #if FEATURE_texture_s3tc
 256    case PIPE_FORMAT_DXT1_RGB:
 257       return MESA_FORMAT_RGB_DXT1;
 258    case PIPE_FORMAT_DXT1_RGBA:
 259       return MESA_FORMAT_RGBA_DXT1;
 260    case PIPE_FORMAT_DXT3_RGBA:
 261       return MESA_FORMAT_RGBA_DXT3;
 262    case PIPE_FORMAT_DXT5_RGBA:
 263       return MESA_FORMAT_RGBA_DXT5;
 264 #if FEATURE_EXT_texture_sRGB
 265    case PIPE_FORMAT_DXT1_SRGB:
 266       return MESA_FORMAT_SRGB_DXT1;
 267    case PIPE_FORMAT_DXT1_SRGBA:
 268       return MESA_FORMAT_SRGBA_DXT1;
 269    case PIPE_FORMAT_DXT3_SRGBA:
 270       return MESA_FORMAT_SRGBA_DXT3;
 271    case PIPE_FORMAT_DXT5_SRGBA:
 272       return MESA_FORMAT_SRGBA_DXT5;
 273 #endif
 274 #endif
 275
 276 #if FEATURE_EXT_texture_sRGB
 277    case PIPE_FORMAT_L8A8_SRGB:
 278       return MESA_FORMAT_SLA8;
 279    case PIPE_FORMAT_L8_SRGB:
 280       return MESA_FORMAT_SL8;
 281    case PIPE_FORMAT_R8G8B8_SRGB:
 282       return MESA_FORMAT_SRGB8;
 283    case PIPE_FORMAT_A8B8G8R8_SRGB:
 284       return MESA_FORMAT_SRGBA8;
 285    case PIPE_FORMAT_B8G8R8A8_SRGB:
 286       return MESA_FORMAT_SARGB8;
 287 #endif
 288    default:
 289       assert(0);
 290       return MESA_FORMAT_NONE;
 291    }
 292 }
 293
 294
 295 /**
 296  * Find an RGBA format supported by the context/winsys.
 297  */
 298 static enum pipe_format
 299 default_rgba_format(struct pipe_screen *screen,
 300                     enum pipe_texture_target target,
 301                     unsigned tex_usage,
 302                     unsigned geom_flags)
 303 {
 304    static const enum pipe_format colorFormats[] = {
 305       PIPE_FORMAT_B8G8R8A8_UNORM,
 306       PIPE_FORMAT_A8R8G8B8_UNORM,
 307       PIPE_FORMAT_A8B8G8R8_UNORM,
 308       PIPE_FORMAT_B5G6R5_UNORM
 309    };
 310    uint i;
 311    for (i = 0; i < Elements(colorFormats); i++) {
 312       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 313          return colorFormats[i];
 314       }
 315    }
 316    return PIPE_FORMAT_NONE;
 317 }
 318
 319 /**
 320  * Find an RGB format supported by the context/winsys.
 321  */
 322 static enum pipe_format
 323 default_rgb_format(struct pipe_screen *screen,
 324                    enum pipe_texture_target target,
 325                    unsigned tex_usage,
 326                    unsigned geom_flags)
 327 {
 328    static const enum pipe_format colorFormats[] = {
 329       PIPE_FORMAT_B8G8R8X8_UNORM,
 330       PIPE_FORMAT_X8R8G8B8_UNORM,
 331       PIPE_FORMAT_X8B8G8R8_UNORM,
 332       PIPE_FORMAT_B8G8R8A8_UNORM,
 333       PIPE_FORMAT_A8R8G8B8_UNORM,
 334       PIPE_FORMAT_A8B8G8R8_UNORM,
 335       PIPE_FORMAT_B5G6R5_UNORM
 336    };
 337    uint i;
 338    for (i = 0; i < Elements(colorFormats); i++) {
 339       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 340          return colorFormats[i];
 341       }
 342    }
 343    return PIPE_FORMAT_NONE;
 344 }
 345
 346 /**
 347  * Find an sRGBA format supported by the context/winsys.
 348  */
 349 static enum pipe_format
 350 default_srgba_format(struct pipe_screen *screen,
 351                     enum pipe_texture_target target,
 352                     unsigned tex_usage,
 353                     unsigned geom_flags)
 354 {
 355    static const enum pipe_format colorFormats[] = {
 356       PIPE_FORMAT_B8G8R8A8_SRGB,
 357       PIPE_FORMAT_A8R8G8B8_SRGB,
 358       PIPE_FORMAT_A8B8G8R8_SRGB,
 359    };
 360    uint i;
 361    for (i = 0; i < Elements(colorFormats); i++) {
 362       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 363          return colorFormats[i];
 364       }
 365    }
 366    return PIPE_FORMAT_NONE;
 367 }
 368
 369 /**
 370  * Search list of formats for first RGBA format with >8 bits/channel.
 371  */
 372 static enum pipe_format
 373 default_deep_rgba_format(struct pipe_screen *screen,
 374                          enum pipe_texture_target target,
 375                          unsigned tex_usage,
 376                          unsigned geom_flags)
 377 {
 378    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM, target, tex_usage, geom_flags)) {
 379       return PIPE_FORMAT_R16G16B16A16_SNORM;
 380    }
 381    if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 382       return default_rgba_format(screen, target, tex_usage, geom_flags);
 383    else
 384       return PIPE_FORMAT_NONE;
 385 }
 386
 387
 388 /**
 389  * Find an Z format supported by the context/winsys.
 390  */
 391 static enum pipe_format
 392 default_depth_format(struct pipe_screen *screen,
 393                      enum pipe_texture_target target,
 394                      unsigned tex_usage,
 395                      unsigned geom_flags)
 396 {
 397    static const enum pipe_format zFormats[] = {
 398       PIPE_FORMAT_Z16_UNORM,
 399       PIPE_FORMAT_Z32_UNORM,
 400       PIPE_FORMAT_Z24S8_UNORM,
 401       PIPE_FORMAT_S8Z24_UNORM
 402    };
 403    uint i;
 404    for (i = 0; i < Elements(zFormats); i++) {
 405       if (screen->is_format_supported( screen, zFormats[i], target, tex_usage, geom_flags )) {
 406          return zFormats[i];
 407       }
 408    }
 409    return PIPE_FORMAT_NONE;
 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  * \param target  one of PIPE_TEXTURE_x
 417  * \param tex_usage  either PIPE_TEXTURE_USAGE_RENDER_TARGET
 418  *                   or PIPE_TEXTURE_USAGE_SAMPLER
 419  */
 420 enum pipe_format
 421 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 422                  enum pipe_texture_target target, unsigned tex_usage)
 423 {
 424    unsigned geom_flags = 0;
 425
 426    switch (internalFormat) {
 427    case 4:
 428    case GL_RGBA:
 429    case GL_COMPRESSED_RGBA:
 430    case GL_RGBA8:
 431    case GL_RGB10_A2:
 432    case GL_RGBA12:
 433       return default_rgba_format( screen, target, tex_usage, geom_flags );
 434    case 3:
 435    case GL_RGB:
 436    case GL_COMPRESSED_RGB:
 437       return default_rgb_format( screen, target, tex_usage, geom_flags );
 438    case GL_RGBA16:
 439       if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 440          return default_deep_rgba_format( screen, target, tex_usage, geom_flags );
 441       else
 442          return default_rgba_format( screen, target, tex_usage, geom_flags );
 443
 444    case GL_RGBA4:
 445    case GL_RGBA2:
 446       if (screen->is_format_supported( screen, PIPE_FORMAT_B4G4R4A4_UNORM, target, tex_usage, geom_flags ))
 447          return PIPE_FORMAT_B4G4R4A4_UNORM;
 448       return default_rgba_format( screen, target, tex_usage, geom_flags );
 449
 450    case GL_RGB5_A1:
 451       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM, target, tex_usage, geom_flags ))
 452          return PIPE_FORMAT_B5G5R5A1_UNORM;
 453       return default_rgba_format( screen, target, tex_usage, geom_flags );
 454
 455    case GL_RGB8:
 456    case GL_RGB10:
 457    case GL_RGB12:
 458    case GL_RGB16:
 459       return default_rgb_format( screen, target, tex_usage, geom_flags );
 460
 461    case GL_RGB5:
 462    case GL_RGB4:
 463    case GL_R3_G3_B2:
 464       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G6R5_UNORM, target, tex_usage, geom_flags ))
 465          return PIPE_FORMAT_B5G6R5_UNORM;
 466       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM, target, tex_usage, geom_flags ))
 467          return PIPE_FORMAT_B5G5R5A1_UNORM;
 468       return default_rgba_format( screen, target, tex_usage, geom_flags );
 469
 470    case GL_ALPHA:
 471    case GL_ALPHA4:
 472    case GL_ALPHA8:
 473    case GL_ALPHA12:
 474    case GL_ALPHA16:
 475    case GL_COMPRESSED_ALPHA:
 476       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target, tex_usage, geom_flags ))
 477          return PIPE_FORMAT_A8_UNORM;
 478       return default_rgba_format( screen, target, tex_usage, geom_flags );
 479
 480    case 1:
 481    case GL_LUMINANCE:
 482    case GL_LUMINANCE4:
 483    case GL_LUMINANCE8:
 484    case GL_LUMINANCE12:
 485    case GL_LUMINANCE16:
 486    case GL_COMPRESSED_LUMINANCE:
 487       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target, tex_usage, geom_flags ))
 488          return PIPE_FORMAT_L8_UNORM;
 489       return default_rgba_format( screen, target, tex_usage, geom_flags );
 490
 491    case 2:
 492    case GL_LUMINANCE_ALPHA:
 493    case GL_LUMINANCE4_ALPHA4:
 494    case GL_LUMINANCE6_ALPHA2:
 495    case GL_LUMINANCE8_ALPHA8:
 496    case GL_LUMINANCE12_ALPHA4:
 497    case GL_LUMINANCE12_ALPHA12:
 498    case GL_LUMINANCE16_ALPHA16:
 499    case GL_COMPRESSED_LUMINANCE_ALPHA:
 500       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target, tex_usage, geom_flags ))
 501          return PIPE_FORMAT_L8A8_UNORM;
 502       return default_rgba_format( screen, target, tex_usage, geom_flags );
 503
 504    case GL_INTENSITY:
 505    case GL_INTENSITY4:
 506    case GL_INTENSITY8:
 507    case GL_INTENSITY12:
 508    case GL_INTENSITY16:
 509    case GL_COMPRESSED_INTENSITY:
 510       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target, tex_usage, geom_flags ))
 511          return PIPE_FORMAT_I8_UNORM;
 512       return default_rgba_format( screen, target, tex_usage, geom_flags );
 513
 514    case GL_YCBCR_MESA:
 515       if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 516                                       target, tex_usage, geom_flags)) {
 517          return PIPE_FORMAT_UYVY;
 518       }
 519       if (screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 520                                       target, tex_usage, geom_flags)) {
 521          return PIPE_FORMAT_YUYV;
 522       }
 523       return PIPE_FORMAT_NONE;
 524
 525    case GL_RGB_S3TC:
 526    case GL_RGB4_S3TC:
 527    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 528       return PIPE_FORMAT_DXT1_RGB;
 529
 530    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 531       return PIPE_FORMAT_DXT1_RGBA;
 532
 533    case GL_RGBA_S3TC:
 534    case GL_RGBA4_S3TC:
 535    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 536       return PIPE_FORMAT_DXT3_RGBA;
 537
 538    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 539       return PIPE_FORMAT_DXT5_RGBA;
 540
 541 #if 0
 542    case GL_COMPRESSED_RGB_FXT1_3DFX:
 543       return PIPE_FORMAT_RGB_FXT1;
 544    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 545       return PIPE_FORMAT_RGB_FXT1;
 546 #endif
 547
 548    case GL_DEPTH_COMPONENT16:
 549       if (screen->is_format_supported( screen, PIPE_FORMAT_Z16_UNORM, target, tex_usage, geom_flags ))
 550          return PIPE_FORMAT_Z16_UNORM;
 551       /* fall-through */
 552    case GL_DEPTH_COMPONENT24:
 553       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 554          return PIPE_FORMAT_Z24S8_UNORM;
 555       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 556          return PIPE_FORMAT_S8Z24_UNORM;
 557       /* fall-through */
 558    case GL_DEPTH_COMPONENT32:
 559       if (screen->is_format_supported( screen, PIPE_FORMAT_Z32_UNORM, target, tex_usage, geom_flags ))
 560          return PIPE_FORMAT_Z32_UNORM;
 561       /* fall-through */
 562    case GL_DEPTH_COMPONENT:
 563       return default_depth_format( screen, target, tex_usage, geom_flags );
 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       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_UNORM, target, tex_usage, geom_flags ))
 571          return PIPE_FORMAT_S8_UNORM;
 572       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 573          return PIPE_FORMAT_Z24S8_UNORM;
 574       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 575          return PIPE_FORMAT_S8Z24_UNORM;
 576       return PIPE_FORMAT_NONE;
 577
 578    case GL_DEPTH_STENCIL_EXT:
 579    case GL_DEPTH24_STENCIL8_EXT:
 580       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 581          return PIPE_FORMAT_Z24S8_UNORM;
 582       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 583          return PIPE_FORMAT_S8Z24_UNORM;
 584       return PIPE_FORMAT_NONE;
 585
 586    case GL_SRGB_EXT:
 587    case GL_SRGB8_EXT:
 588    case GL_COMPRESSED_SRGB_EXT:
 589    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 590    case GL_SRGB_ALPHA_EXT:
 591    case GL_SRGB8_ALPHA8_EXT:
 592       return default_srgba_format( screen, target, tex_usage, geom_flags );
 593    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 594       return PIPE_FORMAT_DXT1_SRGB;
 595    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 596       return PIPE_FORMAT_DXT1_SRGBA;
 597    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 598       return PIPE_FORMAT_DXT3_SRGBA;
 599    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 600       return PIPE_FORMAT_DXT5_SRGBA;
 601
 602    case GL_SLUMINANCE_ALPHA_EXT:
 603    case GL_SLUMINANCE8_ALPHA8_EXT:
 604    case GL_COMPRESSED_SLUMINANCE_EXT:
 605    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 606       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_SRGB, target, tex_usage, geom_flags ))
 607          return PIPE_FORMAT_L8A8_SRGB;
 608       return default_srgba_format( screen, target, tex_usage, geom_flags );
 609
 610    case GL_SLUMINANCE_EXT:
 611    case GL_SLUMINANCE8_EXT:
 612       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_SRGB, target, tex_usage, geom_flags ))
 613          return PIPE_FORMAT_L8_SRGB;
 614       return default_srgba_format( screen, target, tex_usage, geom_flags );
 615
 616    default:
 617       return PIPE_FORMAT_NONE;
 618    }
 619 }
 620
 621
 622 static GLboolean
 623 is_depth_or_stencil_format(GLenum internalFormat)
 624 {
 625    switch (internalFormat) {
 626    case GL_DEPTH_COMPONENT:
 627    case GL_DEPTH_COMPONENT16:
 628    case GL_DEPTH_COMPONENT24:
 629    case GL_DEPTH_COMPONENT32:
 630    case GL_STENCIL_INDEX:
 631    case GL_STENCIL_INDEX1_EXT:
 632    case GL_STENCIL_INDEX4_EXT:
 633    case GL_STENCIL_INDEX8_EXT:
 634    case GL_STENCIL_INDEX16_EXT:
 635    case GL_DEPTH_STENCIL_EXT:
 636    case GL_DEPTH24_STENCIL8_EXT:
 637       return GL_TRUE;
 638    default:
 639       return GL_FALSE;
 640    }
 641 }
 642
 643 /**
 644  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 645  */
 646 enum pipe_format
 647 st_choose_renderbuffer_format(struct pipe_screen *screen,
 648                               GLenum internalFormat)
 649 {
 650    uint usage;
 651    if (is_depth_or_stencil_format(internalFormat))
 652       usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
 653    else
 654       usage = PIPE_TEXTURE_USAGE_RENDER_TARGET;
 655    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D, usage);
 656 }
 657
 658
 659 /**
 660  * Called via ctx->Driver.chooseTextureFormat().
 661  */
 662 gl_format
 663 st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 664                        GLenum format, GLenum type)
 665 {
 666    enum pipe_format pFormat;
 667
 668    (void) format;
 669    (void) type;
 670
 671    pFormat = st_choose_format(ctx->st->pipe->screen, internalFormat,
 672                               PIPE_TEXTURE_2D, PIPE_TEXTURE_USAGE_SAMPLER);
 673    if (pFormat == PIPE_FORMAT_NONE)
 674       return MESA_FORMAT_NONE;
 675
 676    return st_pipe_format_to_mesa_format(pFormat);
 677 }
 678
 679
 680 /**
 681  * Test if a gallium format is equivalent to a GL format/type.
 682  */
 683 GLboolean
 684 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 685 {
 686    switch (pFormat) {
 687    case PIPE_FORMAT_A8B8G8R8_UNORM:
 688       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 689    case PIPE_FORMAT_A8R8G8B8_UNORM:
 690       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 691    case PIPE_FORMAT_B5G6R5_UNORM:
 692       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 693    /* XXX more combos... */
 694    default:
 695       return GL_FALSE;
 696    }
 697 }