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_B8G8R8A8_UNORM:
 295       return MESA_FORMAT_ARGB8888_REV;
 296    case PIPE_FORMAT_A1R5G5B5_UNORM:
 297       return MESA_FORMAT_ARGB1555;
 298    case PIPE_FORMAT_A4R4G4B4_UNORM:
 299       return MESA_FORMAT_ARGB4444;
 300    case PIPE_FORMAT_R5G6B5_UNORM:
 301       return MESA_FORMAT_RGB565;
 302    case PIPE_FORMAT_A8L8_UNORM:
 303       return MESA_FORMAT_AL88;
 304    case PIPE_FORMAT_A8_UNORM:
 305       return MESA_FORMAT_A8;
 306    case PIPE_FORMAT_L8_UNORM:
 307       return MESA_FORMAT_L8;
 308    case PIPE_FORMAT_I8_UNORM:
 309       return MESA_FORMAT_I8;
 310    case PIPE_FORMAT_Z16_UNORM:
 311       return MESA_FORMAT_Z16;
 312    case PIPE_FORMAT_Z32_UNORM:
 313       return MESA_FORMAT_Z32;
 314    case PIPE_FORMAT_Z24X8_UNORM:
 315       return MESA_FORMAT_Z24_X8;
 316    case PIPE_FORMAT_Z24S8_UNORM:
 317       return MESA_FORMAT_Z24_S8;
 318    case PIPE_FORMAT_X8Z24_UNORM:
 319       return MESA_FORMAT_X8_Z24;
 320    case PIPE_FORMAT_S8Z24_UNORM:
 321       return MESA_FORMAT_S8_Z24;
 322    case PIPE_FORMAT_S8_UNORM:
 323       return MESA_FORMAT_S8;
 324
 325    case PIPE_FORMAT_YCBCR:
 326       return MESA_FORMAT_YCBCR;
 327    case PIPE_FORMAT_R16G16B16A16_SNORM:
 328       return MESA_FORMAT_SIGNED_RGBA_16;
 329
 330 #if FEATURE_texture_s3tc
 331    case PIPE_FORMAT_DXT1_RGB:
 332       return MESA_FORMAT_RGB_DXT1;
 333    case PIPE_FORMAT_DXT1_RGBA:
 334       return MESA_FORMAT_RGBA_DXT1;
 335    case PIPE_FORMAT_DXT3_RGBA:
 336       return MESA_FORMAT_RGBA_DXT3;
 337    case PIPE_FORMAT_DXT5_RGBA:
 338       return MESA_FORMAT_RGBA_DXT5;
 339 #if FEATURE_EXT_texture_sRGB
 340    case PIPE_FORMAT_DXT1_SRGB:
 341       return MESA_FORMAT_SRGB_DXT1;
 342    case PIPE_FORMAT_DXT1_SRGBA:
 343       return MESA_FORMAT_SRGBA_DXT1;
 344    case PIPE_FORMAT_DXT3_SRGBA:
 345       return MESA_FORMAT_SRGBA_DXT3;
 346    case PIPE_FORMAT_DXT5_SRGBA:
 347       return MESA_FORMAT_SRGBA_DXT5;
 348 #endif
 349 #endif
 350 #if FEATURE_EXT_texture_sRGB
 351    case PIPE_FORMAT_A8L8_SRGB:
 352       return MESA_FORMAT_SLA8;
 353    case PIPE_FORMAT_L8_SRGB:
 354       return MESA_FORMAT_SL8;
 355    case PIPE_FORMAT_R8G8B8_SRGB:
 356       return MESA_FORMAT_SRGB8;
 357    case PIPE_FORMAT_R8G8B8A8_SRGB:
 358       return MESA_FORMAT_SRGBA8;
 359    case PIPE_FORMAT_A8R8G8B8_SRGB:
 360       return MESA_FORMAT_SARGB8;
 361 #endif
 362    default:
 363       assert(0);
 364       return 0;
 365    }
 366 }
 367
 368
 369 /**
 370  * Find an RGBA format supported by the context/winsys.
 371  */
 372 static enum pipe_format
 373 default_rgba_format(struct pipe_screen *screen,
 374                     enum pipe_texture_target target,
 375                     unsigned tex_usage,
 376                     unsigned geom_flags)
 377 {
 378    static const enum pipe_format colorFormats[] = {
 379       PIPE_FORMAT_A8R8G8B8_UNORM,
 380       PIPE_FORMAT_B8G8R8A8_UNORM,
 381       PIPE_FORMAT_R8G8B8A8_UNORM,
 382       PIPE_FORMAT_R5G6B5_UNORM
 383    };
 384    uint i;
 385    for (i = 0; i < Elements(colorFormats); i++) {
 386       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 387          return colorFormats[i];
 388       }
 389    }
 390    return PIPE_FORMAT_NONE;
 391 }
 392
 393 /**
 394  * Find an sRGBA format supported by the context/winsys.
 395  */
 396 static enum pipe_format
 397 default_srgba_format(struct pipe_screen *screen,
 398                     enum pipe_texture_target target,
 399                     unsigned tex_usage,
 400                     unsigned geom_flags)
 401 {
 402    static const enum pipe_format colorFormats[] = {
 403       PIPE_FORMAT_A8R8G8B8_SRGB,
 404       PIPE_FORMAT_B8G8R8A8_SRGB,
 405       PIPE_FORMAT_R8G8B8A8_SRGB,
 406    };
 407    uint i;
 408    for (i = 0; i < Elements(colorFormats); i++) {
 409       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 410          return colorFormats[i];
 411       }
 412    }
 413    return PIPE_FORMAT_NONE;
 414 }
 415
 416 /**
 417  * Search list of formats for first RGBA format with >8 bits/channel.
 418  */
 419 static enum pipe_format
 420 default_deep_rgba_format(struct pipe_screen *screen,
 421                          enum pipe_texture_target target,
 422                          unsigned tex_usage,
 423                          unsigned geom_flags)
 424 {
 425    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM, target, tex_usage, geom_flags)) {
 426       return PIPE_FORMAT_R16G16B16A16_SNORM;
 427    }
 428    if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 429       return default_rgba_format(screen, target, tex_usage, geom_flags);
 430    else
 431       return PIPE_FORMAT_NONE;
 432 }
 433
 434
 435 /**
 436  * Find an Z format supported by the context/winsys.
 437  */
 438 static enum pipe_format
 439 default_depth_format(struct pipe_screen *screen,
 440                      enum pipe_texture_target target,
 441                      unsigned tex_usage,
 442                      unsigned geom_flags)
 443 {
 444    static const enum pipe_format zFormats[] = {
 445       PIPE_FORMAT_Z16_UNORM,
 446       PIPE_FORMAT_Z32_UNORM,
 447       PIPE_FORMAT_S8Z24_UNORM,
 448       PIPE_FORMAT_Z24S8_UNORM
 449    };
 450    uint i;
 451    for (i = 0; i < Elements(zFormats); i++) {
 452       if (screen->is_format_supported( screen, zFormats[i], target, tex_usage, geom_flags )) {
 453          return zFormats[i];
 454       }
 455    }
 456    return PIPE_FORMAT_NONE;
 457 }
 458
 459
 460 /**
 461  * Given an OpenGL internalFormat value for a texture or surface, return
 462  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
 463  * \param target  one of PIPE_TEXTURE_x
 464  * \param tex_usage  either PIPE_TEXTURE_USAGE_RENDER_TARGET
 465  *                   or PIPE_TEXTURE_USAGE_SAMPLER
 466  */
 467 enum pipe_format
 468 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 469                  enum pipe_texture_target target, unsigned tex_usage)
 470 {
 471    unsigned geom_flags = 0;
 472
 473    switch (internalFormat) {
 474    case 4:
 475    case GL_RGBA:
 476    case GL_COMPRESSED_RGBA:
 477    case 3:
 478    case GL_RGB:
 479    case GL_COMPRESSED_RGB:
 480    case GL_RGBA8:
 481    case GL_RGB10_A2:
 482    case GL_RGBA12:
 483       return default_rgba_format( screen, target, tex_usage, geom_flags );
 484    case GL_RGBA16:
 485       if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 486          return default_deep_rgba_format( screen, target, tex_usage, geom_flags );
 487       else
 488          return default_rgba_format( screen, target, tex_usage, geom_flags );
 489
 490    case GL_RGBA4:
 491    case GL_RGBA2:
 492       if (screen->is_format_supported( screen, PIPE_FORMAT_A4R4G4B4_UNORM, target, tex_usage, geom_flags ))
 493          return PIPE_FORMAT_A4R4G4B4_UNORM;
 494       return default_rgba_format( screen, target, tex_usage, geom_flags );
 495
 496    case GL_RGB5_A1:
 497       if (screen->is_format_supported( screen, PIPE_FORMAT_A1R5G5B5_UNORM, target, tex_usage, geom_flags ))
 498          return PIPE_FORMAT_A1R5G5B5_UNORM;
 499       return default_rgba_format( screen, target, tex_usage, geom_flags );
 500
 501    case GL_RGB8:
 502    case GL_RGB10:
 503    case GL_RGB12:
 504    case GL_RGB16:
 505       return default_rgba_format( screen, target, tex_usage, geom_flags );
 506
 507    case GL_RGB5:
 508    case GL_RGB4:
 509    case GL_R3_G3_B2:
 510       if (screen->is_format_supported( screen, PIPE_FORMAT_R5G6B5_UNORM, target, tex_usage, geom_flags ))
 511          return PIPE_FORMAT_R5G6B5_UNORM;
 512       if (screen->is_format_supported( screen, PIPE_FORMAT_A1R5G5B5_UNORM, target, tex_usage, geom_flags ))
 513          return PIPE_FORMAT_A1R5G5B5_UNORM;
 514       return default_rgba_format( screen, target, tex_usage, geom_flags );
 515
 516    case GL_ALPHA:
 517    case GL_ALPHA4:
 518    case GL_ALPHA8:
 519    case GL_ALPHA12:
 520    case GL_ALPHA16:
 521    case GL_COMPRESSED_ALPHA:
 522       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target, tex_usage, geom_flags ))
 523          return PIPE_FORMAT_A8_UNORM;
 524       return default_rgba_format( screen, target, tex_usage, geom_flags );
 525
 526    case 1:
 527    case GL_LUMINANCE:
 528    case GL_LUMINANCE4:
 529    case GL_LUMINANCE8:
 530    case GL_LUMINANCE12:
 531    case GL_LUMINANCE16:
 532    case GL_COMPRESSED_LUMINANCE:
 533       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target, tex_usage, geom_flags ))
 534          return PIPE_FORMAT_L8_UNORM;
 535       return default_rgba_format( screen, target, tex_usage, geom_flags );
 536
 537    case 2:
 538    case GL_LUMINANCE_ALPHA:
 539    case GL_LUMINANCE4_ALPHA4:
 540    case GL_LUMINANCE6_ALPHA2:
 541    case GL_LUMINANCE8_ALPHA8:
 542    case GL_LUMINANCE12_ALPHA4:
 543    case GL_LUMINANCE12_ALPHA12:
 544    case GL_LUMINANCE16_ALPHA16:
 545    case GL_COMPRESSED_LUMINANCE_ALPHA:
 546       if (screen->is_format_supported( screen, PIPE_FORMAT_A8L8_UNORM, target, tex_usage, geom_flags ))
 547          return PIPE_FORMAT_A8L8_UNORM;
 548       return default_rgba_format( screen, target, tex_usage, geom_flags );
 549
 550    case GL_INTENSITY:
 551    case GL_INTENSITY4:
 552    case GL_INTENSITY8:
 553    case GL_INTENSITY12:
 554    case GL_INTENSITY16:
 555    case GL_COMPRESSED_INTENSITY:
 556       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target, tex_usage, geom_flags ))
 557          return PIPE_FORMAT_I8_UNORM;
 558       return default_rgba_format( screen, target, tex_usage, geom_flags );
 559
 560    case GL_YCBCR_MESA:
 561       if (screen->is_format_supported(screen, PIPE_FORMAT_YCBCR,
 562                                       target, tex_usage, geom_flags)) {
 563          return PIPE_FORMAT_YCBCR;
 564       }
 565       if (screen->is_format_supported(screen, PIPE_FORMAT_YCBCR_REV,
 566                                       target, tex_usage, geom_flags)) {
 567          return PIPE_FORMAT_YCBCR_REV;
 568       }
 569       return PIPE_FORMAT_NONE;
 570
 571    case GL_RGB_S3TC:
 572    case GL_RGB4_S3TC:
 573    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 574       return PIPE_FORMAT_DXT1_RGB;
 575
 576    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 577       return PIPE_FORMAT_DXT1_RGBA;
 578
 579    case GL_RGBA_S3TC:
 580    case GL_RGBA4_S3TC:
 581    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 582       return PIPE_FORMAT_DXT3_RGBA;
 583
 584    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 585       return PIPE_FORMAT_DXT5_RGBA;
 586
 587 #if 0
 588    case GL_COMPRESSED_RGB_FXT1_3DFX:
 589       return PIPE_FORMAT_RGB_FXT1;
 590    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 591       return PIPE_FORMAT_RGB_FXT1;
 592 #endif
 593
 594    case GL_DEPTH_COMPONENT16:
 595       if (screen->is_format_supported( screen, PIPE_FORMAT_Z16_UNORM, target, tex_usage, geom_flags ))
 596          return PIPE_FORMAT_Z16_UNORM;
 597       /* fall-through */
 598    case GL_DEPTH_COMPONENT24:
 599       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 600          return PIPE_FORMAT_S8Z24_UNORM;
 601       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 602          return PIPE_FORMAT_Z24S8_UNORM;
 603       /* fall-through */
 604    case GL_DEPTH_COMPONENT32:
 605       if (screen->is_format_supported( screen, PIPE_FORMAT_Z32_UNORM, target, tex_usage, geom_flags ))
 606          return PIPE_FORMAT_Z32_UNORM;
 607       /* fall-through */
 608    case GL_DEPTH_COMPONENT:
 609       return default_depth_format( screen, target, tex_usage, geom_flags );
 610
 611    case GL_STENCIL_INDEX:
 612    case GL_STENCIL_INDEX1_EXT:
 613    case GL_STENCIL_INDEX4_EXT:
 614    case GL_STENCIL_INDEX8_EXT:
 615    case GL_STENCIL_INDEX16_EXT:
 616       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_UNORM, target, tex_usage, geom_flags ))
 617          return PIPE_FORMAT_S8_UNORM;
 618       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 619          return PIPE_FORMAT_S8Z24_UNORM;
 620       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 621          return PIPE_FORMAT_Z24S8_UNORM;
 622       return PIPE_FORMAT_NONE;
 623
 624    case GL_DEPTH_STENCIL_EXT:
 625    case GL_DEPTH24_STENCIL8_EXT:
 626       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 627          return PIPE_FORMAT_S8Z24_UNORM;
 628       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 629          return PIPE_FORMAT_Z24S8_UNORM;
 630       return PIPE_FORMAT_NONE;
 631
 632    case GL_SRGB_EXT:
 633    case GL_SRGB8_EXT:
 634    case GL_COMPRESSED_SRGB_EXT:
 635    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 636    case GL_SRGB_ALPHA_EXT:
 637    case GL_SRGB8_ALPHA8_EXT:
 638       return default_srgba_format( screen, target, tex_usage, geom_flags );
 639    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 640       return PIPE_FORMAT_DXT1_SRGB;
 641    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 642       return PIPE_FORMAT_DXT1_SRGBA;
 643    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 644       return PIPE_FORMAT_DXT3_SRGBA;
 645    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 646       return PIPE_FORMAT_DXT5_SRGBA;
 647
 648    case GL_SLUMINANCE_ALPHA_EXT:
 649    case GL_SLUMINANCE8_ALPHA8_EXT:
 650    case GL_COMPRESSED_SLUMINANCE_EXT:
 651    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 652       if (screen->is_format_supported( screen, PIPE_FORMAT_A8L8_SRGB, target, tex_usage, geom_flags ))
 653          return PIPE_FORMAT_A8L8_SRGB;
 654       return default_srgba_format( screen, target, tex_usage, geom_flags );
 655
 656    case GL_SLUMINANCE_EXT:
 657    case GL_SLUMINANCE8_EXT:
 658       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_SRGB, target, tex_usage, geom_flags ))
 659          return PIPE_FORMAT_L8_SRGB;
 660       return default_srgba_format( screen, target, tex_usage, geom_flags );
 661
 662    default:
 663       return PIPE_FORMAT_NONE;
 664    }
 665 }
 666
 667
 668 static GLboolean
 669 is_depth_or_stencil_format(GLenum internalFormat)
 670 {
 671    switch (internalFormat) {
 672    case GL_DEPTH_COMPONENT:
 673    case GL_DEPTH_COMPONENT16:
 674    case GL_DEPTH_COMPONENT24:
 675    case GL_DEPTH_COMPONENT32:
 676    case GL_STENCIL_INDEX:
 677    case GL_STENCIL_INDEX1_EXT:
 678    case GL_STENCIL_INDEX4_EXT:
 679    case GL_STENCIL_INDEX8_EXT:
 680    case GL_STENCIL_INDEX16_EXT:
 681    case GL_DEPTH_STENCIL_EXT:
 682    case GL_DEPTH24_STENCIL8_EXT:
 683       return GL_TRUE;
 684    default:
 685       return GL_FALSE;
 686    }
 687 }
 688
 689 /**
 690  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 691  */
 692 enum pipe_format
 693 st_choose_renderbuffer_format(struct pipe_screen *screen,
 694                               GLenum internalFormat)
 695 {
 696    uint usage;
 697    if (is_depth_or_stencil_format(internalFormat))
 698       usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
 699    else
 700       usage = PIPE_TEXTURE_USAGE_RENDER_TARGET;
 701    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D, usage);
 702 }
 703
 704
 705 static gl_format
 706 translate_gallium_format_to_mesa_format(enum pipe_format format)
 707 {
 708    switch (format) {
 709    case PIPE_FORMAT_A8R8G8B8_UNORM:
 710       return MESA_FORMAT_ARGB8888;
 711    case PIPE_FORMAT_X8R8G8B8_UNORM:
 712       return MESA_FORMAT_XRGB8888;
 713    case PIPE_FORMAT_A1R5G5B5_UNORM:
 714       return MESA_FORMAT_ARGB1555;
 715    case PIPE_FORMAT_A4R4G4B4_UNORM:
 716       return MESA_FORMAT_ARGB4444;
 717    case PIPE_FORMAT_R5G6B5_UNORM:
 718       return MESA_FORMAT_RGB565;
 719    case PIPE_FORMAT_A8L8_UNORM:
 720       return MESA_FORMAT_AL88;
 721    case PIPE_FORMAT_A8_UNORM:
 722       return MESA_FORMAT_A8;
 723    case PIPE_FORMAT_L8_UNORM:
 724       return MESA_FORMAT_L8;
 725    case PIPE_FORMAT_I8_UNORM:
 726       return MESA_FORMAT_I8;
 727    case PIPE_FORMAT_Z16_UNORM:
 728       return MESA_FORMAT_Z16;
 729    case PIPE_FORMAT_Z32_UNORM:
 730       return MESA_FORMAT_Z32;
 731    case PIPE_FORMAT_Z24S8_UNORM:
 732       return MESA_FORMAT_Z24_S8;
 733    case PIPE_FORMAT_X8Z24_UNORM:
 734       return MESA_FORMAT_X8_Z24;
 735    case PIPE_FORMAT_S8Z24_UNORM:
 736       return MESA_FORMAT_S8_Z24;
 737    case PIPE_FORMAT_YCBCR:
 738       return MESA_FORMAT_YCBCR;
 739    case PIPE_FORMAT_YCBCR_REV:
 740       return MESA_FORMAT_YCBCR_REV;
 741 #if FEATURE_texture_s3tc
 742    case PIPE_FORMAT_DXT1_RGB:
 743       return MESA_FORMAT_RGB_DXT1;
 744    case PIPE_FORMAT_DXT1_RGBA:
 745       return MESA_FORMAT_RGBA_DXT1;
 746    case PIPE_FORMAT_DXT3_RGBA:
 747       return MESA_FORMAT_RGBA_DXT3;
 748    case PIPE_FORMAT_DXT5_RGBA:
 749       return MESA_FORMAT_RGBA_DXT5;
 750 #if FEATURE_EXT_texture_sRGB
 751    case PIPE_FORMAT_DXT1_SRGB:
 752       return MESA_FORMAT_SRGB_DXT1;
 753    case PIPE_FORMAT_DXT1_SRGBA:
 754       return MESA_FORMAT_SRGBA_DXT1;
 755    case PIPE_FORMAT_DXT3_SRGBA:
 756       return MESA_FORMAT_SRGBA_DXT3;
 757    case PIPE_FORMAT_DXT5_SRGBA:
 758       return MESA_FORMAT_SRGBA_DXT5;
 759 #endif
 760 #endif
 761 #if FEATURE_EXT_texture_sRGB
 762    case PIPE_FORMAT_A8L8_SRGB:
 763       return MESA_FORMAT_SLA8;
 764    case PIPE_FORMAT_L8_SRGB:
 765       return MESA_FORMAT_SL8;
 766    case PIPE_FORMAT_R8G8B8_SRGB:
 767       return MESA_FORMAT_SRGB8;
 768    case PIPE_FORMAT_R8G8B8A8_SRGB:
 769       return MESA_FORMAT_SRGBA8;
 770    case PIPE_FORMAT_A8R8G8B8_SRGB:
 771       return MESA_FORMAT_SARGB8;
 772 #endif
 773    /* XXX add additional cases */
 774    default:
 775       assert(0);
 776       return MESA_FORMAT_NONE;
 777    }
 778 }
 779
 780
 781 /**
 782  * Called via ctx->Driver.chooseTextureFormat().
 783  */
 784 gl_format
 785 st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 786                        GLenum format, GLenum type)
 787 {
 788    enum pipe_format pFormat;
 789
 790    (void) format;
 791    (void) type;
 792
 793    pFormat = st_choose_format(ctx->st->pipe->screen, internalFormat,
 794                               PIPE_TEXTURE_2D, PIPE_TEXTURE_USAGE_SAMPLER);
 795    if (pFormat == PIPE_FORMAT_NONE)
 796       return MESA_FORMAT_NONE;
 797
 798    return translate_gallium_format_to_mesa_format(pFormat);
 799 }
 800
 801
 802 /**
 803  * Test if a gallium format is equivalent to a GL format/type.
 804  */
 805 GLboolean
 806 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 807 {
 808    switch (pFormat) {
 809    case PIPE_FORMAT_R8G8B8A8_UNORM:
 810       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 811    case PIPE_FORMAT_B8G8R8A8_UNORM:
 812       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 813    case PIPE_FORMAT_R5G6B5_UNORM:
 814       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 815    /* XXX more combos... */
 816    default:
 817       return GL_FALSE;
 818    }
 819 }