src/mesa/state_tracker/st_format.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * Copyright (c) 2008 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  * Texture Image-related functions.
  32  * \author Brian Paul
  33  */
  34
  35 #include "main/imports.h"
  36 #include "main/context.h"
  37 #include "main/texstore.h"
  38 #include "main/texformat.h"
  39 #include "main/enums.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 "st_context.h"
  46 #include "st_format.h"
  47
  48 static GLuint
  49 format_bits(
  50    pipe_format_rgbazs_t  info,
  51    GLuint comp )
  52 {
  53    return pf_get_component_bits( (enum pipe_format) info, comp );
  54 }
  55
  56 static GLuint
  57 format_max_bits(
  58    pipe_format_rgbazs_t  info )
  59 {
  60    GLuint   size = format_bits( info, PIPE_FORMAT_COMP_R );
  61
  62    size = MAX2( size, format_bits( info, PIPE_FORMAT_COMP_G ) );
  63    size = MAX2( size, format_bits( info, PIPE_FORMAT_COMP_B ) );
  64    size = MAX2( size, format_bits( info, PIPE_FORMAT_COMP_A ) );
  65    size = MAX2( size, format_bits( info, PIPE_FORMAT_COMP_Z ) );
  66    size = MAX2( size, format_bits( info, PIPE_FORMAT_COMP_S ) );
  67    return size;
  68 }
  69
  70 static GLuint
  71 format_size(
  72    pipe_format_rgbazs_t  info )
  73 {
  74    return
  75       format_bits( info, PIPE_FORMAT_COMP_R ) +
  76       format_bits( info, PIPE_FORMAT_COMP_G ) +
  77       format_bits( info, PIPE_FORMAT_COMP_B ) +
  78       format_bits( info, PIPE_FORMAT_COMP_A ) +
  79       format_bits( info, PIPE_FORMAT_COMP_Z ) +
  80       format_bits( info, PIPE_FORMAT_COMP_S );
  81 }
  82
  83 /*
  84  * XXX temporary here
  85  */
  86 GLboolean
  87 st_get_format_info(enum pipe_format format, struct pipe_format_info *pinfo)
  88 {
  89    if (pf_layout(format) == PIPE_FORMAT_LAYOUT_RGBAZS) {
  90       pipe_format_rgbazs_t info;
  91
  92       info = format;
  93
  94 #if 0
  95       printf("%s\n", pf_name( format ) );
  96 #endif
  97
  98       /* Data type */
  99       if (format == PIPE_FORMAT_A1R5G5B5_UNORM || format == PIPE_FORMAT_R5G6B5_UNORM) {
 100          pinfo->datatype = GL_UNSIGNED_SHORT;
 101       }
 102       else if (format == PIPE_FORMAT_S8Z24_UNORM) {
 103          pinfo->datatype = GL_UNSIGNED_INT_24_8;
 104       }
 105       else {
 106          const GLuint size = format_max_bits( info );
 107          if (size == 8) {
 108             if (pf_type(info) == PIPE_FORMAT_TYPE_UNORM)
 109                pinfo->datatype = GL_UNSIGNED_BYTE;
 110             else
 111                pinfo->datatype = GL_BYTE;
 112          }
 113          else if (size == 16) {
 114             if (pf_type(info) == PIPE_FORMAT_TYPE_UNORM)
 115                pinfo->datatype = GL_UNSIGNED_SHORT;
 116             else
 117                pinfo->datatype = GL_SHORT;
 118          }
 119          else {
 120             assert( size <= 32 );
 121             if (pf_type(info) == PIPE_FORMAT_TYPE_UNORM)
 122                pinfo->datatype = GL_UNSIGNED_INT;
 123             else
 124                pinfo->datatype = GL_INT;
 125          }
 126       }
 127
 128       /* Component bits */
 129       pinfo->red_bits = format_bits( info, PIPE_FORMAT_COMP_R );
 130       pinfo->green_bits = format_bits( info, PIPE_FORMAT_COMP_G );
 131       pinfo->blue_bits = format_bits( info, PIPE_FORMAT_COMP_B );
 132       pinfo->alpha_bits = format_bits( info, PIPE_FORMAT_COMP_A );
 133       pinfo->depth_bits = format_bits( info, PIPE_FORMAT_COMP_Z );
 134       pinfo->stencil_bits = format_bits( info, PIPE_FORMAT_COMP_S );
 135       pinfo->luminance_bits = 0;
 136       pinfo->intensity_bits = 0;
 137
 138       /* Format size */
 139       pinfo->size = format_size( info ) / 8;
 140
 141       /* Luminance & Intensity bits */
 142       if( pf_swizzle_x(info) == PIPE_FORMAT_COMP_R &&
 143           pf_swizzle_y(info) == PIPE_FORMAT_COMP_R &&
 144           pf_swizzle_z(info) == PIPE_FORMAT_COMP_R ) {
 145          if( pf_swizzle_w(info) == PIPE_FORMAT_COMP_R ) {
 146             pinfo->intensity_bits = pinfo->red_bits;
 147          }
 148          else {
 149             pinfo->luminance_bits = pinfo->red_bits;
 150          }
 151          pinfo->red_bits = 0;
 152       }
 153
 154       pinfo->mesa_format = st_pipe_format_to_mesa_format(format);
 155    }
 156    else if (pf_layout(format) == PIPE_FORMAT_LAYOUT_YCBCR) {
 157       pinfo->mesa_format = MESA_FORMAT_YCBCR;
 158       pinfo->datatype = GL_UNSIGNED_SHORT;
 159       pinfo->size = 2; /* two bytes per "texel" */
 160    }
 161    else {
 162       /* compressed format? */
 163       assert(0);
 164    }
 165
 166 #if 0
 167    printf(
 168       "ST_FORMAT: R(%u), G(%u), B(%u), A(%u), Z(%u), S(%u)\n",
 169       pinfo->red_bits,
 170       pinfo->green_bits,
 171       pinfo->blue_bits,
 172       pinfo->alpha_bits,
 173       pinfo->depth_bits,
 174       pinfo->stencil_bits );
 175 #endif
 176
 177    pinfo->format = format;
 178
 179    return GL_TRUE;
 180 }
 181
 182
 183 /**
 184  * Return bytes per pixel for the given format.
 185  */
 186 GLuint
 187 st_sizeof_format(enum pipe_format format)
 188 {
 189    struct pipe_format_info info;
 190    if (!st_get_format_info( format, &info )) {
 191       assert( 0 );
 192       return 0;
 193    }
 194    return info.size;
 195 }
 196
 197
 198 /**
 199  * Return bytes per pixel for the given format.
 200  */
 201 GLenum
 202 st_format_datatype(enum pipe_format format)
 203 {
 204    struct pipe_format_info info;
 205    if (!st_get_format_info( format, &info )) {
 206       assert( 0 );
 207       return 0;
 208    }
 209    return info.datatype;
 210 }
 211
 212
 213 enum pipe_format
 214 st_mesa_format_to_pipe_format(gl_format mesaFormat)
 215 {
 216    switch (mesaFormat) {
 217       /* fix this */
 218    case MESA_FORMAT_ARGB8888_REV:
 219    case MESA_FORMAT_ARGB8888:
 220       return PIPE_FORMAT_A8R8G8B8_UNORM;
 221    case MESA_FORMAT_XRGB8888:
 222       return PIPE_FORMAT_X8R8G8B8_UNORM;
 223    case MESA_FORMAT_ARGB1555:
 224       return PIPE_FORMAT_A1R5G5B5_UNORM;
 225    case MESA_FORMAT_ARGB4444:
 226       return PIPE_FORMAT_A4R4G4B4_UNORM;
 227    case MESA_FORMAT_RGB565:
 228       return PIPE_FORMAT_R5G6B5_UNORM;
 229    case MESA_FORMAT_AL88:
 230       return PIPE_FORMAT_A8L8_UNORM;
 231    case MESA_FORMAT_A8:
 232       return PIPE_FORMAT_A8_UNORM;
 233    case MESA_FORMAT_L8:
 234       return PIPE_FORMAT_L8_UNORM;
 235    case MESA_FORMAT_I8:
 236       return PIPE_FORMAT_I8_UNORM;
 237    case MESA_FORMAT_Z16:
 238       return PIPE_FORMAT_Z16_UNORM;
 239    case MESA_FORMAT_Z32:
 240       return PIPE_FORMAT_Z32_UNORM;
 241    case MESA_FORMAT_Z24_S8:
 242       return PIPE_FORMAT_Z24S8_UNORM;
 243    case MESA_FORMAT_S8_Z24:
 244       return PIPE_FORMAT_S8Z24_UNORM;
 245    case MESA_FORMAT_YCBCR:
 246       return PIPE_FORMAT_YCBCR;
 247 #if FEATURE_texture_s3tc
 248    case MESA_FORMAT_RGB_DXT1:
 249       return PIPE_FORMAT_DXT1_RGB;
 250    case MESA_FORMAT_RGBA_DXT1:
 251       return PIPE_FORMAT_DXT1_RGBA;
 252    case MESA_FORMAT_RGBA_DXT3:
 253       return PIPE_FORMAT_DXT3_RGBA;
 254    case MESA_FORMAT_RGBA_DXT5:
 255       return PIPE_FORMAT_DXT5_RGBA;
 256 #if FEATURE_EXT_texture_sRGB
 257    case MESA_FORMAT_SRGB_DXT1:
 258       return PIPE_FORMAT_DXT1_SRGB;
 259    case MESA_FORMAT_SRGBA_DXT1:
 260       return PIPE_FORMAT_DXT1_SRGBA;
 261    case MESA_FORMAT_SRGBA_DXT3:
 262       return PIPE_FORMAT_DXT3_SRGBA;
 263    case MESA_FORMAT_SRGBA_DXT5:
 264       return PIPE_FORMAT_DXT5_SRGBA;
 265 #endif
 266 #endif
 267 #if FEATURE_EXT_texture_sRGB
 268    case MESA_FORMAT_SLA8:
 269       return PIPE_FORMAT_A8L8_SRGB;
 270    case MESA_FORMAT_SL8:
 271       return PIPE_FORMAT_L8_SRGB;
 272    case MESA_FORMAT_SRGB8:
 273       return PIPE_FORMAT_R8G8B8_SRGB;
 274    case MESA_FORMAT_SRGBA8:
 275       return PIPE_FORMAT_R8G8B8A8_SRGB;
 276    case MESA_FORMAT_SARGB8:
 277       return PIPE_FORMAT_A8R8G8B8_SRGB;
 278 #endif
 279    default:
 280       assert(0);
 281       return 0;
 282    }
 283 }
 284
 285
 286 gl_format
 287 st_pipe_format_to_mesa_format(enum pipe_format pipeFormat)
 288 {
 289    switch (pipeFormat) {
 290    case PIPE_FORMAT_A8R8G8B8_UNORM:
 291       return MESA_FORMAT_ARGB8888;
 292    case PIPE_FORMAT_X8R8G8B8_UNORM:
 293       return MESA_FORMAT_XRGB8888;
 294    case PIPE_FORMAT_A1R5G5B5_UNORM:
 295       return MESA_FORMAT_ARGB1555;
 296    case PIPE_FORMAT_A4R4G4B4_UNORM:
 297       return MESA_FORMAT_ARGB4444;
 298    case PIPE_FORMAT_R5G6B5_UNORM:
 299       return MESA_FORMAT_RGB565;
 300    case PIPE_FORMAT_A8L8_UNORM:
 301       return MESA_FORMAT_AL88;
 302    case PIPE_FORMAT_A8_UNORM:
 303       return MESA_FORMAT_A8;
 304    case PIPE_FORMAT_L8_UNORM:
 305       return MESA_FORMAT_L8;
 306    case PIPE_FORMAT_I8_UNORM:
 307       return MESA_FORMAT_I8;
 308    case PIPE_FORMAT_Z16_UNORM:
 309       return MESA_FORMAT_Z16;
 310    case PIPE_FORMAT_Z32_UNORM:
 311       return MESA_FORMAT_Z32;
 312    case PIPE_FORMAT_Z24S8_UNORM:
 313       return MESA_FORMAT_Z24_S8;
 314    case PIPE_FORMAT_X8Z24_UNORM:
 315    case PIPE_FORMAT_S8Z24_UNORM:
 316       return MESA_FORMAT_S8_Z24;
 317    case PIPE_FORMAT_S8_UNORM:
 318       return MESA_FORMAT_S8;
 319
 320    case PIPE_FORMAT_YCBCR:
 321       return MESA_FORMAT_YCBCR;
 322    case PIPE_FORMAT_R16G16B16A16_SNORM:
 323       return MESA_FORMAT_SIGNED_RGBA_16;
 324
 325 #if FEATURE_texture_s3tc
 326    case PIPE_FORMAT_DXT1_RGB:
 327       return MESA_FORMAT_RGB_DXT1;
 328    case PIPE_FORMAT_DXT1_RGBA:
 329       return MESA_FORMAT_RGBA_DXT1;
 330    case PIPE_FORMAT_DXT3_RGBA:
 331       return MESA_FORMAT_RGBA_DXT3;
 332    case PIPE_FORMAT_DXT5_RGBA:
 333       return MESA_FORMAT_RGBA_DXT5;
 334 #if FEATURE_EXT_texture_sRGB
 335    case PIPE_FORMAT_DXT1_SRGB:
 336       return MESA_FORMAT_SRGB_DXT1;
 337    case PIPE_FORMAT_DXT1_SRGBA:
 338       return MESA_FORMAT_SRGBA_DXT1;
 339    case PIPE_FORMAT_DXT3_SRGBA:
 340       return MESA_FORMAT_SRGBA_DXT3;
 341    case PIPE_FORMAT_DXT5_SRGBA:
 342       return MESA_FORMAT_SRGBA_DXT5;
 343 #endif
 344 #endif
 345 #if FEATURE_EXT_texture_sRGB
 346    case PIPE_FORMAT_A8L8_SRGB:
 347       return MESA_FORMAT_SLA8;
 348    case PIPE_FORMAT_L8_SRGB:
 349       return MESA_FORMAT_SL8;
 350    case PIPE_FORMAT_R8G8B8_SRGB:
 351       return MESA_FORMAT_SRGB8;
 352    case PIPE_FORMAT_R8G8B8A8_SRGB:
 353       return MESA_FORMAT_SRGBA8;
 354    case PIPE_FORMAT_A8R8G8B8_SRGB:
 355       return MESA_FORMAT_SARGB8;
 356 #endif
 357    default:
 358       assert(0);
 359       return 0;
 360    }
 361 }
 362
 363
 364 /**
 365  * Find an RGBA format supported by the context/winsys.
 366  */
 367 static enum pipe_format
 368 default_rgba_format(struct pipe_screen *screen,
 369                     enum pipe_texture_target target,
 370                     unsigned tex_usage,
 371                     unsigned geom_flags)
 372 {
 373    static const enum pipe_format colorFormats[] = {
 374       PIPE_FORMAT_A8R8G8B8_UNORM,
 375       PIPE_FORMAT_B8G8R8A8_UNORM,
 376       PIPE_FORMAT_R8G8B8A8_UNORM,
 377       PIPE_FORMAT_R5G6B5_UNORM
 378    };
 379    uint i;
 380    for (i = 0; i < Elements(colorFormats); i++) {
 381       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 382          return colorFormats[i];
 383       }
 384    }
 385    return PIPE_FORMAT_NONE;
 386 }
 387
 388 /**
 389  * Find an sRGBA format supported by the context/winsys.
 390  */
 391 static enum pipe_format
 392 default_srgba_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 colorFormats[] = {
 398       PIPE_FORMAT_A8R8G8B8_SRGB,
 399       PIPE_FORMAT_B8G8R8A8_SRGB,
 400       PIPE_FORMAT_R8G8B8A8_SRGB,
 401    };
 402    uint i;
 403    for (i = 0; i < Elements(colorFormats); i++) {
 404       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 405          return colorFormats[i];
 406       }
 407    }
 408    return PIPE_FORMAT_NONE;
 409 }
 410
 411 /**
 412  * Search list of formats for first RGBA format with >8 bits/channel.
 413  */
 414 static enum pipe_format
 415 default_deep_rgba_format(struct pipe_screen *screen,
 416                          enum pipe_texture_target target,
 417                          unsigned tex_usage,
 418                          unsigned geom_flags)
 419 {
 420    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM, target, tex_usage, geom_flags)) {
 421       return PIPE_FORMAT_R16G16B16A16_SNORM;
 422    }
 423    if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 424       return default_rgba_format(screen, target, tex_usage, geom_flags);
 425    else
 426       return PIPE_FORMAT_NONE;
 427 }
 428
 429
 430 /**
 431  * Find an Z format supported by the context/winsys.
 432  */
 433 static enum pipe_format
 434 default_depth_format(struct pipe_screen *screen,
 435                      enum pipe_texture_target target,
 436                      unsigned tex_usage,
 437                      unsigned geom_flags)
 438 {
 439    static const enum pipe_format zFormats[] = {
 440       PIPE_FORMAT_Z16_UNORM,
 441       PIPE_FORMAT_Z32_UNORM,
 442       PIPE_FORMAT_S8Z24_UNORM,
 443       PIPE_FORMAT_Z24S8_UNORM
 444    };
 445    uint i;
 446    for (i = 0; i < Elements(zFormats); i++) {
 447       if (screen->is_format_supported( screen, zFormats[i], target, tex_usage, geom_flags )) {
 448          return zFormats[i];
 449       }
 450    }
 451    return PIPE_FORMAT_NONE;
 452 }
 453
 454
 455 /**
 456  * Given an OpenGL internalFormat value for a texture or surface, return
 457  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
 458  * \param target  one of PIPE_TEXTURE_x
 459  * \param tex_usage  either PIPE_TEXTURE_USAGE_RENDER_TARGET
 460  *                   or PIPE_TEXTURE_USAGE_SAMPLER
 461  */
 462 enum pipe_format
 463 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 464                  enum pipe_texture_target target, unsigned tex_usage)
 465 {
 466    unsigned geom_flags = 0;
 467
 468    switch (internalFormat) {
 469    case 4:
 470    case GL_RGBA:
 471    case GL_COMPRESSED_RGBA:
 472    case 3:
 473    case GL_RGB:
 474    case GL_COMPRESSED_RGB:
 475    case GL_RGBA8:
 476    case GL_RGB10_A2:
 477    case GL_RGBA12:
 478       return default_rgba_format( screen, target, tex_usage, geom_flags );
 479    case GL_RGBA16:
 480       if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 481          return default_deep_rgba_format( screen, target, tex_usage, geom_flags );
 482       else
 483          return default_rgba_format( screen, target, tex_usage, geom_flags );
 484
 485    case GL_RGBA4:
 486    case GL_RGBA2:
 487       if (screen->is_format_supported( screen, PIPE_FORMAT_A4R4G4B4_UNORM, target, tex_usage, geom_flags ))
 488          return PIPE_FORMAT_A4R4G4B4_UNORM;
 489       return default_rgba_format( screen, target, tex_usage, geom_flags );
 490
 491    case GL_RGB5_A1:
 492       if (screen->is_format_supported( screen, PIPE_FORMAT_A1R5G5B5_UNORM, target, tex_usage, geom_flags ))
 493          return PIPE_FORMAT_A1R5G5B5_UNORM;
 494       return default_rgba_format( screen, target, tex_usage, geom_flags );
 495
 496    case GL_RGB8:
 497    case GL_RGB10:
 498    case GL_RGB12:
 499    case GL_RGB16:
 500       return default_rgba_format( screen, target, tex_usage, geom_flags );
 501
 502    case GL_RGB5:
 503    case GL_RGB4:
 504    case GL_R3_G3_B2:
 505       if (screen->is_format_supported( screen, PIPE_FORMAT_R5G6B5_UNORM, target, tex_usage, geom_flags ))
 506          return PIPE_FORMAT_R5G6B5_UNORM;
 507       if (screen->is_format_supported( screen, PIPE_FORMAT_A1R5G5B5_UNORM, target, tex_usage, geom_flags ))
 508          return PIPE_FORMAT_A1R5G5B5_UNORM;
 509       return default_rgba_format( screen, target, tex_usage, geom_flags );
 510
 511    case GL_ALPHA:
 512    case GL_ALPHA4:
 513    case GL_ALPHA8:
 514    case GL_ALPHA12:
 515    case GL_ALPHA16:
 516    case GL_COMPRESSED_ALPHA:
 517       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target, tex_usage, geom_flags ))
 518          return PIPE_FORMAT_A8_UNORM;
 519       return default_rgba_format( screen, target, tex_usage, geom_flags );
 520
 521    case 1:
 522    case GL_LUMINANCE:
 523    case GL_LUMINANCE4:
 524    case GL_LUMINANCE8:
 525    case GL_LUMINANCE12:
 526    case GL_LUMINANCE16:
 527    case GL_COMPRESSED_LUMINANCE:
 528       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target, tex_usage, geom_flags ))
 529          return PIPE_FORMAT_L8_UNORM;
 530       return default_rgba_format( screen, target, tex_usage, geom_flags );
 531
 532    case 2:
 533    case GL_LUMINANCE_ALPHA:
 534    case GL_LUMINANCE4_ALPHA4:
 535    case GL_LUMINANCE6_ALPHA2:
 536    case GL_LUMINANCE8_ALPHA8:
 537    case GL_LUMINANCE12_ALPHA4:
 538    case GL_LUMINANCE12_ALPHA12:
 539    case GL_LUMINANCE16_ALPHA16:
 540    case GL_COMPRESSED_LUMINANCE_ALPHA:
 541       if (screen->is_format_supported( screen, PIPE_FORMAT_A8L8_UNORM, target, tex_usage, geom_flags ))
 542          return PIPE_FORMAT_A8L8_UNORM;
 543       return default_rgba_format( screen, target, tex_usage, geom_flags );
 544
 545    case GL_INTENSITY:
 546    case GL_INTENSITY4:
 547    case GL_INTENSITY8:
 548    case GL_INTENSITY12:
 549    case GL_INTENSITY16:
 550    case GL_COMPRESSED_INTENSITY:
 551       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target, tex_usage, geom_flags ))
 552          return PIPE_FORMAT_I8_UNORM;
 553       return default_rgba_format( screen, target, tex_usage, geom_flags );
 554
 555    case GL_YCBCR_MESA:
 556       if (screen->is_format_supported(screen, PIPE_FORMAT_YCBCR,
 557                                       target, tex_usage, geom_flags)) {
 558          return PIPE_FORMAT_YCBCR;
 559       }
 560       if (screen->is_format_supported(screen, PIPE_FORMAT_YCBCR_REV,
 561                                       target, tex_usage, geom_flags)) {
 562          return PIPE_FORMAT_YCBCR_REV;
 563       }
 564       return PIPE_FORMAT_NONE;
 565
 566    case GL_RGB_S3TC:
 567    case GL_RGB4_S3TC:
 568    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 569       return PIPE_FORMAT_DXT1_RGB;
 570
 571    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 572       return PIPE_FORMAT_DXT1_RGBA;
 573
 574    case GL_RGBA_S3TC:
 575    case GL_RGBA4_S3TC:
 576    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 577       return PIPE_FORMAT_DXT3_RGBA;
 578
 579    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 580       return PIPE_FORMAT_DXT5_RGBA;
 581
 582 #if 0
 583    case GL_COMPRESSED_RGB_FXT1_3DFX:
 584       return PIPE_FORMAT_RGB_FXT1;
 585    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 586       return PIPE_FORMAT_RGB_FXT1;
 587 #endif
 588
 589    case GL_DEPTH_COMPONENT16:
 590       if (screen->is_format_supported( screen, PIPE_FORMAT_Z16_UNORM, target, tex_usage, geom_flags ))
 591          return PIPE_FORMAT_Z16_UNORM;
 592       /* fall-through */
 593    case GL_DEPTH_COMPONENT24:
 594       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 595          return PIPE_FORMAT_S8Z24_UNORM;
 596       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 597          return PIPE_FORMAT_Z24S8_UNORM;
 598       /* fall-through */
 599    case GL_DEPTH_COMPONENT32:
 600       if (screen->is_format_supported( screen, PIPE_FORMAT_Z32_UNORM, target, tex_usage, geom_flags ))
 601          return PIPE_FORMAT_Z32_UNORM;
 602       /* fall-through */
 603    case GL_DEPTH_COMPONENT:
 604       return default_depth_format( screen, target, tex_usage, geom_flags );
 605
 606    case GL_STENCIL_INDEX:
 607    case GL_STENCIL_INDEX1_EXT:
 608    case GL_STENCIL_INDEX4_EXT:
 609    case GL_STENCIL_INDEX8_EXT:
 610    case GL_STENCIL_INDEX16_EXT:
 611       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_UNORM, target, tex_usage, geom_flags ))
 612          return PIPE_FORMAT_S8_UNORM;
 613       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 614          return PIPE_FORMAT_S8Z24_UNORM;
 615       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 616          return PIPE_FORMAT_Z24S8_UNORM;
 617       return PIPE_FORMAT_NONE;
 618
 619    case GL_DEPTH_STENCIL_EXT:
 620    case GL_DEPTH24_STENCIL8_EXT:
 621       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 622          return PIPE_FORMAT_S8Z24_UNORM;
 623       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 624          return PIPE_FORMAT_Z24S8_UNORM;
 625       return PIPE_FORMAT_NONE;
 626
 627    case GL_SRGB_EXT:
 628    case GL_SRGB8_EXT:
 629    case GL_COMPRESSED_SRGB_EXT:
 630    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 631    case GL_SRGB_ALPHA_EXT:
 632    case GL_SRGB8_ALPHA8_EXT:
 633       return default_srgba_format( screen, target, tex_usage, geom_flags );
 634    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 635       return PIPE_FORMAT_DXT1_SRGB;
 636    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 637       return PIPE_FORMAT_DXT1_SRGBA;
 638    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 639       return PIPE_FORMAT_DXT3_SRGBA;
 640    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 641       return PIPE_FORMAT_DXT5_SRGBA;
 642
 643    case GL_SLUMINANCE_ALPHA_EXT:
 644    case GL_SLUMINANCE8_ALPHA8_EXT:
 645    case GL_COMPRESSED_SLUMINANCE_EXT:
 646    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 647       if (screen->is_format_supported( screen, PIPE_FORMAT_A8L8_SRGB, target, tex_usage, geom_flags ))
 648          return PIPE_FORMAT_A8L8_SRGB;
 649       return default_srgba_format( screen, target, tex_usage, geom_flags );
 650
 651    case GL_SLUMINANCE_EXT:
 652    case GL_SLUMINANCE8_EXT:
 653       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_SRGB, target, tex_usage, geom_flags ))
 654          return PIPE_FORMAT_L8_SRGB;
 655       return default_srgba_format( screen, target, tex_usage, geom_flags );
 656
 657    default:
 658       return PIPE_FORMAT_NONE;
 659    }
 660 }
 661
 662
 663 static GLboolean
 664 is_depth_or_stencil_format(GLenum internalFormat)
 665 {
 666    switch (internalFormat) {
 667    case GL_DEPTH_COMPONENT:
 668    case GL_DEPTH_COMPONENT16:
 669    case GL_DEPTH_COMPONENT24:
 670    case GL_DEPTH_COMPONENT32:
 671    case GL_STENCIL_INDEX:
 672    case GL_STENCIL_INDEX1_EXT:
 673    case GL_STENCIL_INDEX4_EXT:
 674    case GL_STENCIL_INDEX8_EXT:
 675    case GL_STENCIL_INDEX16_EXT:
 676    case GL_DEPTH_STENCIL_EXT:
 677    case GL_DEPTH24_STENCIL8_EXT:
 678       return GL_TRUE;
 679    default:
 680       return GL_FALSE;
 681    }
 682 }
 683
 684 /**
 685  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 686  */
 687 enum pipe_format
 688 st_choose_renderbuffer_format(struct pipe_screen *screen,
 689                               GLenum internalFormat)
 690 {
 691    uint usage;
 692    if (is_depth_or_stencil_format(internalFormat))
 693       usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
 694    else
 695       usage = PIPE_TEXTURE_USAGE_RENDER_TARGET;
 696    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D, usage);
 697 }
 698
 699
 700 static gl_format
 701 translate_gallium_format_to_mesa_format(enum pipe_format format)
 702 {
 703    switch (format) {
 704    case PIPE_FORMAT_A8R8G8B8_UNORM:
 705       return MESA_FORMAT_ARGB8888;
 706    case PIPE_FORMAT_X8R8G8B8_UNORM:
 707       return MESA_FORMAT_XRGB8888;
 708    case PIPE_FORMAT_A1R5G5B5_UNORM:
 709       return MESA_FORMAT_ARGB1555;
 710    case PIPE_FORMAT_A4R4G4B4_UNORM:
 711       return MESA_FORMAT_ARGB4444;
 712    case PIPE_FORMAT_R5G6B5_UNORM:
 713       return MESA_FORMAT_RGB565;
 714    case PIPE_FORMAT_A8L8_UNORM:
 715       return MESA_FORMAT_AL88;
 716    case PIPE_FORMAT_A8_UNORM:
 717       return MESA_FORMAT_A8;
 718    case PIPE_FORMAT_L8_UNORM:
 719       return MESA_FORMAT_L8;
 720    case PIPE_FORMAT_I8_UNORM:
 721       return MESA_FORMAT_I8;
 722    case PIPE_FORMAT_Z16_UNORM:
 723       return MESA_FORMAT_Z16;
 724    case PIPE_FORMAT_Z32_UNORM:
 725       return MESA_FORMAT_Z32;
 726    case PIPE_FORMAT_Z24S8_UNORM:
 727       return MESA_FORMAT_Z24_S8;
 728    case PIPE_FORMAT_X8Z24_UNORM:
 729    case PIPE_FORMAT_S8Z24_UNORM:
 730       return MESA_FORMAT_S8_Z24;
 731    case PIPE_FORMAT_YCBCR:
 732       return MESA_FORMAT_YCBCR;
 733    case PIPE_FORMAT_YCBCR_REV:
 734       return MESA_FORMAT_YCBCR_REV;
 735 #if FEATURE_texture_s3tc
 736    case PIPE_FORMAT_DXT1_RGB:
 737       return MESA_FORMAT_RGB_DXT1;
 738    case PIPE_FORMAT_DXT1_RGBA:
 739       return MESA_FORMAT_RGBA_DXT1;
 740    case PIPE_FORMAT_DXT3_RGBA:
 741       return MESA_FORMAT_RGBA_DXT3;
 742    case PIPE_FORMAT_DXT5_RGBA:
 743       return MESA_FORMAT_RGBA_DXT5;
 744 #if FEATURE_EXT_texture_sRGB
 745    case PIPE_FORMAT_DXT1_SRGB:
 746       return MESA_FORMAT_SRGB_DXT1;
 747    case PIPE_FORMAT_DXT1_SRGBA:
 748       return MESA_FORMAT_SRGBA_DXT1;
 749    case PIPE_FORMAT_DXT3_SRGBA:
 750       return MESA_FORMAT_SRGBA_DXT3;
 751    case PIPE_FORMAT_DXT5_SRGBA:
 752       return MESA_FORMAT_SRGBA_DXT5;
 753 #endif
 754 #endif
 755 #if FEATURE_EXT_texture_sRGB
 756    case PIPE_FORMAT_A8L8_SRGB:
 757       return MESA_FORMAT_SLA8;
 758    case PIPE_FORMAT_L8_SRGB:
 759       return MESA_FORMAT_SL8;
 760    case PIPE_FORMAT_R8G8B8_SRGB:
 761       return MESA_FORMAT_SRGB8;
 762    case PIPE_FORMAT_R8G8B8A8_SRGB:
 763       return MESA_FORMAT_SRGBA8;
 764    case PIPE_FORMAT_A8R8G8B8_SRGB:
 765       return MESA_FORMAT_SARGB8;
 766 #endif
 767    /* XXX add additional cases */
 768    default:
 769       assert(0);
 770       return MESA_FORMAT_NONE;
 771    }
 772 }
 773
 774
 775 /**
 776  * Called via ctx->Driver.chooseTextureFormat().
 777  */
 778 gl_format
 779 st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 780                        GLenum format, GLenum type)
 781 {
 782    enum pipe_format pFormat;
 783
 784    (void) format;
 785    (void) type;
 786
 787    pFormat = st_choose_format(ctx->st->pipe->screen, internalFormat,
 788                               PIPE_TEXTURE_2D, PIPE_TEXTURE_USAGE_SAMPLER);
 789    if (pFormat == PIPE_FORMAT_NONE)
 790       return MESA_FORMAT_NONE;
 791
 792    return translate_gallium_format_to_mesa_format(pFormat);
 793 }
 794
 795
 796 /**
 797  * Test if a gallium format is equivalent to a GL format/type.
 798  */
 799 GLboolean
 800 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 801 {
 802    switch (pFormat) {
 803    case PIPE_FORMAT_R8G8B8A8_UNORM:
 804       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 805    case PIPE_FORMAT_B8G8R8A8_UNORM:
 806       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 807    case PIPE_FORMAT_R5G6B5_UNORM:
 808       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 809    /* XXX more combos... */
 810    default:
 811       return GL_FALSE;
 812    }
 813 }