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                format == PIPE_FORMAT_Z24S8_UNORM) {
 104          pinfo->datatype = GL_UNSIGNED_INT_24_8;
 105       }
 106       else {
 107          const GLuint size = format_max_bits( info );
 108          if (size == 8) {
 109             if (pf_type(info) == PIPE_FORMAT_TYPE_UNORM)
 110                pinfo->datatype = GL_UNSIGNED_BYTE;
 111             else
 112                pinfo->datatype = GL_BYTE;
 113          }
 114          else if (size == 16) {
 115             if (pf_type(info) == PIPE_FORMAT_TYPE_UNORM)
 116                pinfo->datatype = GL_UNSIGNED_SHORT;
 117             else
 118                pinfo->datatype = GL_SHORT;
 119          }
 120          else {
 121             assert( size <= 32 );
 122             if (pf_type(info) == PIPE_FORMAT_TYPE_UNORM)
 123                pinfo->datatype = GL_UNSIGNED_INT;
 124             else
 125                pinfo->datatype = GL_INT;
 126          }
 127       }
 128
 129       /* Component bits */
 130       pinfo->red_bits = format_bits( info, PIPE_FORMAT_COMP_R );
 131       pinfo->green_bits = format_bits( info, PIPE_FORMAT_COMP_G );
 132       pinfo->blue_bits = format_bits( info, PIPE_FORMAT_COMP_B );
 133       pinfo->alpha_bits = format_bits( info, PIPE_FORMAT_COMP_A );
 134       pinfo->depth_bits = format_bits( info, PIPE_FORMAT_COMP_Z );
 135       pinfo->stencil_bits = format_bits( info, PIPE_FORMAT_COMP_S );
 136       pinfo->luminance_bits = 0;
 137       pinfo->intensity_bits = 0;
 138
 139       /* Format size */
 140       pinfo->size = format_size( info ) / 8;
 141
 142       /* Luminance & Intensity bits */
 143       if( pf_swizzle_x(info) == PIPE_FORMAT_COMP_R &&
 144           pf_swizzle_y(info) == PIPE_FORMAT_COMP_R &&
 145           pf_swizzle_z(info) == PIPE_FORMAT_COMP_R ) {
 146          if( pf_swizzle_w(info) == PIPE_FORMAT_COMP_R ) {
 147             pinfo->intensity_bits = pinfo->red_bits;
 148          }
 149          else {
 150             pinfo->luminance_bits = pinfo->red_bits;
 151          }
 152          pinfo->red_bits = 0;
 153       }
 154
 155       pinfo->mesa_format = st_pipe_format_to_mesa_format(format);
 156    }
 157    else if (pf_layout(format) == PIPE_FORMAT_LAYOUT_YCBCR) {
 158       pinfo->mesa_format = MESA_FORMAT_YCBCR;
 159       pinfo->datatype = GL_UNSIGNED_SHORT;
 160       pinfo->size = 2; /* two bytes per "texel" */
 161    }
 162    else {
 163       /* compressed format? */
 164       assert(0);
 165    }
 166
 167 #if 0
 168    printf(
 169       "ST_FORMAT: R(%u), G(%u), B(%u), A(%u), Z(%u), S(%u)\n",
 170       pinfo->red_bits,
 171       pinfo->green_bits,
 172       pinfo->blue_bits,
 173       pinfo->alpha_bits,
 174       pinfo->depth_bits,
 175       pinfo->stencil_bits );
 176 #endif
 177
 178    pinfo->format = format;
 179
 180    return GL_TRUE;
 181 }
 182
 183
 184 /**
 185  * Return bytes per pixel for the given format.
 186  */
 187 GLuint
 188 st_sizeof_format(enum pipe_format format)
 189 {
 190    struct pipe_format_info info;
 191    if (!st_get_format_info( format, &info )) {
 192       assert( 0 );
 193       return 0;
 194    }
 195    return info.size;
 196 }
 197
 198
 199 /**
 200  * Return bytes per pixel for the given format.
 201  */
 202 GLenum
 203 st_format_datatype(enum pipe_format format)
 204 {
 205    struct pipe_format_info info;
 206    if (!st_get_format_info( format, &info )) {
 207       assert( 0 );
 208       return 0;
 209    }
 210    return info.datatype;
 211 }
 212
 213
 214 enum pipe_format
 215 st_mesa_format_to_pipe_format(gl_format mesaFormat)
 216 {
 217    switch (mesaFormat) {
 218       /* fix this */
 219    case MESA_FORMAT_ARGB8888_REV:
 220    case MESA_FORMAT_ARGB8888:
 221       return PIPE_FORMAT_A8R8G8B8_UNORM;
 222    case MESA_FORMAT_XRGB8888:
 223       return PIPE_FORMAT_X8R8G8B8_UNORM;
 224    case MESA_FORMAT_ARGB1555:
 225       return PIPE_FORMAT_A1R5G5B5_UNORM;
 226    case MESA_FORMAT_ARGB4444:
 227       return PIPE_FORMAT_A4R4G4B4_UNORM;
 228    case MESA_FORMAT_RGB565:
 229       return PIPE_FORMAT_R5G6B5_UNORM;
 230    case MESA_FORMAT_AL88:
 231       return PIPE_FORMAT_A8L8_UNORM;
 232    case MESA_FORMAT_A8:
 233       return PIPE_FORMAT_A8_UNORM;
 234    case MESA_FORMAT_L8:
 235       return PIPE_FORMAT_L8_UNORM;
 236    case MESA_FORMAT_I8:
 237       return PIPE_FORMAT_I8_UNORM;
 238    case MESA_FORMAT_Z16:
 239       return PIPE_FORMAT_Z16_UNORM;
 240    case MESA_FORMAT_Z32:
 241       return PIPE_FORMAT_Z32_UNORM;
 242    case MESA_FORMAT_Z24_S8:
 243       return PIPE_FORMAT_Z24S8_UNORM;
 244    case MESA_FORMAT_S8_Z24:
 245       return PIPE_FORMAT_S8Z24_UNORM;
 246    case MESA_FORMAT_YCBCR:
 247       return PIPE_FORMAT_YCBCR;
 248 #if FEATURE_texture_s3tc
 249    case MESA_FORMAT_RGB_DXT1:
 250       return PIPE_FORMAT_DXT1_RGB;
 251    case MESA_FORMAT_RGBA_DXT1:
 252       return PIPE_FORMAT_DXT1_RGBA;
 253    case MESA_FORMAT_RGBA_DXT3:
 254       return PIPE_FORMAT_DXT3_RGBA;
 255    case MESA_FORMAT_RGBA_DXT5:
 256       return PIPE_FORMAT_DXT5_RGBA;
 257 #if FEATURE_EXT_texture_sRGB
 258    case MESA_FORMAT_SRGB_DXT1:
 259       return PIPE_FORMAT_DXT1_SRGB;
 260    case MESA_FORMAT_SRGBA_DXT1:
 261       return PIPE_FORMAT_DXT1_SRGBA;
 262    case MESA_FORMAT_SRGBA_DXT3:
 263       return PIPE_FORMAT_DXT3_SRGBA;
 264    case MESA_FORMAT_SRGBA_DXT5:
 265       return PIPE_FORMAT_DXT5_SRGBA;
 266 #endif
 267 #endif
 268 #if FEATURE_EXT_texture_sRGB
 269    case MESA_FORMAT_SLA8:
 270       return PIPE_FORMAT_A8L8_SRGB;
 271    case MESA_FORMAT_SL8:
 272       return PIPE_FORMAT_L8_SRGB;
 273    case MESA_FORMAT_SRGB8:
 274       return PIPE_FORMAT_R8G8B8_SRGB;
 275    case MESA_FORMAT_SRGBA8:
 276       return PIPE_FORMAT_R8G8B8A8_SRGB;
 277    case MESA_FORMAT_SARGB8:
 278       return PIPE_FORMAT_A8R8G8B8_SRGB;
 279 #endif
 280    default:
 281       assert(0);
 282       return 0;
 283    }
 284 }
 285
 286
 287 gl_format
 288 st_pipe_format_to_mesa_format(enum pipe_format pipeFormat)
 289 {
 290    switch (pipeFormat) {
 291    case PIPE_FORMAT_A8R8G8B8_UNORM:
 292       return MESA_FORMAT_ARGB8888;
 293    case PIPE_FORMAT_X8R8G8B8_UNORM:
 294       return MESA_FORMAT_XRGB8888;
 295    case PIPE_FORMAT_B8G8R8A8_UNORM:
 296       return MESA_FORMAT_ARGB8888_REV;
 297    case PIPE_FORMAT_A1R5G5B5_UNORM:
 298       return MESA_FORMAT_ARGB1555;
 299    case PIPE_FORMAT_A4R4G4B4_UNORM:
 300       return MESA_FORMAT_ARGB4444;
 301    case PIPE_FORMAT_R5G6B5_UNORM:
 302       return MESA_FORMAT_RGB565;
 303    case PIPE_FORMAT_A8L8_UNORM:
 304       return MESA_FORMAT_AL88;
 305    case PIPE_FORMAT_A8_UNORM:
 306       return MESA_FORMAT_A8;
 307    case PIPE_FORMAT_L8_UNORM:
 308       return MESA_FORMAT_L8;
 309    case PIPE_FORMAT_I8_UNORM:
 310       return MESA_FORMAT_I8;
 311    case PIPE_FORMAT_Z16_UNORM:
 312       return MESA_FORMAT_Z16;
 313    case PIPE_FORMAT_Z32_UNORM:
 314       return MESA_FORMAT_Z32;
 315    case PIPE_FORMAT_Z24X8_UNORM:
 316       return MESA_FORMAT_Z24_X8;
 317    case PIPE_FORMAT_Z24S8_UNORM:
 318       return MESA_FORMAT_Z24_S8;
 319    case PIPE_FORMAT_X8Z24_UNORM:
 320       return MESA_FORMAT_X8_Z24;
 321    case PIPE_FORMAT_S8Z24_UNORM:
 322       return MESA_FORMAT_S8_Z24;
 323    case PIPE_FORMAT_S8_UNORM:
 324       return MESA_FORMAT_S8;
 325
 326    case PIPE_FORMAT_YCBCR:
 327       return MESA_FORMAT_YCBCR;
 328    case PIPE_FORMAT_R16G16B16A16_SNORM:
 329       return MESA_FORMAT_SIGNED_RGBA_16;
 330
 331 #if FEATURE_texture_s3tc
 332    case PIPE_FORMAT_DXT1_RGB:
 333       return MESA_FORMAT_RGB_DXT1;
 334    case PIPE_FORMAT_DXT1_RGBA:
 335       return MESA_FORMAT_RGBA_DXT1;
 336    case PIPE_FORMAT_DXT3_RGBA:
 337       return MESA_FORMAT_RGBA_DXT3;
 338    case PIPE_FORMAT_DXT5_RGBA:
 339       return MESA_FORMAT_RGBA_DXT5;
 340 #if FEATURE_EXT_texture_sRGB
 341    case PIPE_FORMAT_DXT1_SRGB:
 342       return MESA_FORMAT_SRGB_DXT1;
 343    case PIPE_FORMAT_DXT1_SRGBA:
 344       return MESA_FORMAT_SRGBA_DXT1;
 345    case PIPE_FORMAT_DXT3_SRGBA:
 346       return MESA_FORMAT_SRGBA_DXT3;
 347    case PIPE_FORMAT_DXT5_SRGBA:
 348       return MESA_FORMAT_SRGBA_DXT5;
 349 #endif
 350 #endif
 351 #if FEATURE_EXT_texture_sRGB
 352    case PIPE_FORMAT_A8L8_SRGB:
 353       return MESA_FORMAT_SLA8;
 354    case PIPE_FORMAT_L8_SRGB:
 355       return MESA_FORMAT_SL8;
 356    case PIPE_FORMAT_R8G8B8_SRGB:
 357       return MESA_FORMAT_SRGB8;
 358    case PIPE_FORMAT_R8G8B8A8_SRGB:
 359       return MESA_FORMAT_SRGBA8;
 360    case PIPE_FORMAT_A8R8G8B8_SRGB:
 361       return MESA_FORMAT_SARGB8;
 362 #endif
 363    default:
 364       assert(0);
 365       return 0;
 366    }
 367 }
 368
 369
 370 /**
 371  * Find an RGBA format supported by the context/winsys.
 372  */
 373 static enum pipe_format
 374 default_rgba_format(struct pipe_screen *screen,
 375                     enum pipe_texture_target target,
 376                     unsigned tex_usage,
 377                     unsigned geom_flags)
 378 {
 379    static const enum pipe_format colorFormats[] = {
 380       PIPE_FORMAT_A8R8G8B8_UNORM,
 381       PIPE_FORMAT_B8G8R8A8_UNORM,
 382       PIPE_FORMAT_R8G8B8A8_UNORM,
 383       PIPE_FORMAT_R5G6B5_UNORM
 384    };
 385    uint i;
 386    for (i = 0; i < Elements(colorFormats); i++) {
 387       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 388          return colorFormats[i];
 389       }
 390    }
 391    return PIPE_FORMAT_NONE;
 392 }
 393
 394 /**
 395  * Find an sRGBA format supported by the context/winsys.
 396  */
 397 static enum pipe_format
 398 default_srgba_format(struct pipe_screen *screen,
 399                     enum pipe_texture_target target,
 400                     unsigned tex_usage,
 401                     unsigned geom_flags)
 402 {
 403    static const enum pipe_format colorFormats[] = {
 404       PIPE_FORMAT_A8R8G8B8_SRGB,
 405       PIPE_FORMAT_B8G8R8A8_SRGB,
 406       PIPE_FORMAT_R8G8B8A8_SRGB,
 407    };
 408    uint i;
 409    for (i = 0; i < Elements(colorFormats); i++) {
 410       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 411          return colorFormats[i];
 412       }
 413    }
 414    return PIPE_FORMAT_NONE;
 415 }
 416
 417 /**
 418  * Search list of formats for first RGBA format with >8 bits/channel.
 419  */
 420 static enum pipe_format
 421 default_deep_rgba_format(struct pipe_screen *screen,
 422                          enum pipe_texture_target target,
 423                          unsigned tex_usage,
 424                          unsigned geom_flags)
 425 {
 426    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM, target, tex_usage, geom_flags)) {
 427       return PIPE_FORMAT_R16G16B16A16_SNORM;
 428    }
 429    if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 430       return default_rgba_format(screen, target, tex_usage, geom_flags);
 431    else
 432       return PIPE_FORMAT_NONE;
 433 }
 434
 435
 436 /**
 437  * Find an Z format supported by the context/winsys.
 438  */
 439 static enum pipe_format
 440 default_depth_format(struct pipe_screen *screen,
 441                      enum pipe_texture_target target,
 442                      unsigned tex_usage,
 443                      unsigned geom_flags)
 444 {
 445    static const enum pipe_format zFormats[] = {
 446       PIPE_FORMAT_Z16_UNORM,
 447       PIPE_FORMAT_Z32_UNORM,
 448       PIPE_FORMAT_S8Z24_UNORM,
 449       PIPE_FORMAT_Z24S8_UNORM
 450    };
 451    uint i;
 452    for (i = 0; i < Elements(zFormats); i++) {
 453       if (screen->is_format_supported( screen, zFormats[i], target, tex_usage, geom_flags )) {
 454          return zFormats[i];
 455       }
 456    }
 457    return PIPE_FORMAT_NONE;
 458 }
 459
 460
 461 /**
 462  * Given an OpenGL internalFormat value for a texture or surface, return
 463  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
 464  * \param target  one of PIPE_TEXTURE_x
 465  * \param tex_usage  either PIPE_TEXTURE_USAGE_RENDER_TARGET
 466  *                   or PIPE_TEXTURE_USAGE_SAMPLER
 467  */
 468 enum pipe_format
 469 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 470                  enum pipe_texture_target target, unsigned tex_usage)
 471 {
 472    unsigned geom_flags = 0;
 473
 474    switch (internalFormat) {
 475    case 4:
 476    case GL_RGBA:
 477    case GL_COMPRESSED_RGBA:
 478    case 3:
 479    case GL_RGB:
 480    case GL_COMPRESSED_RGB:
 481    case GL_RGBA8:
 482    case GL_RGB10_A2:
 483    case GL_RGBA12:
 484       return default_rgba_format( screen, target, tex_usage, geom_flags );
 485    case GL_RGBA16:
 486       if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 487          return default_deep_rgba_format( screen, target, tex_usage, geom_flags );
 488       else
 489          return default_rgba_format( screen, target, tex_usage, geom_flags );
 490
 491    case GL_RGBA4:
 492    case GL_RGBA2:
 493       if (screen->is_format_supported( screen, PIPE_FORMAT_A4R4G4B4_UNORM, target, tex_usage, geom_flags ))
 494          return PIPE_FORMAT_A4R4G4B4_UNORM;
 495       return default_rgba_format( screen, target, tex_usage, geom_flags );
 496
 497    case GL_RGB5_A1:
 498       if (screen->is_format_supported( screen, PIPE_FORMAT_A1R5G5B5_UNORM, target, tex_usage, geom_flags ))
 499          return PIPE_FORMAT_A1R5G5B5_UNORM;
 500       return default_rgba_format( screen, target, tex_usage, geom_flags );
 501
 502    case GL_RGB8:
 503    case GL_RGB10:
 504    case GL_RGB12:
 505    case GL_RGB16:
 506       return default_rgba_format( screen, target, tex_usage, geom_flags );
 507
 508    case GL_RGB5:
 509    case GL_RGB4:
 510    case GL_R3_G3_B2:
 511       if (screen->is_format_supported( screen, PIPE_FORMAT_R5G6B5_UNORM, target, tex_usage, geom_flags ))
 512          return PIPE_FORMAT_R5G6B5_UNORM;
 513       if (screen->is_format_supported( screen, PIPE_FORMAT_A1R5G5B5_UNORM, target, tex_usage, geom_flags ))
 514          return PIPE_FORMAT_A1R5G5B5_UNORM;
 515       return default_rgba_format( screen, target, tex_usage, geom_flags );
 516
 517    case GL_ALPHA:
 518    case GL_ALPHA4:
 519    case GL_ALPHA8:
 520    case GL_ALPHA12:
 521    case GL_ALPHA16:
 522    case GL_COMPRESSED_ALPHA:
 523       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target, tex_usage, geom_flags ))
 524          return PIPE_FORMAT_A8_UNORM;
 525       return default_rgba_format( screen, target, tex_usage, geom_flags );
 526
 527    case 1:
 528    case GL_LUMINANCE:
 529    case GL_LUMINANCE4:
 530    case GL_LUMINANCE8:
 531    case GL_LUMINANCE12:
 532    case GL_LUMINANCE16:
 533    case GL_COMPRESSED_LUMINANCE:
 534       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target, tex_usage, geom_flags ))
 535          return PIPE_FORMAT_L8_UNORM;
 536       return default_rgba_format( screen, target, tex_usage, geom_flags );
 537
 538    case 2:
 539    case GL_LUMINANCE_ALPHA:
 540    case GL_LUMINANCE4_ALPHA4:
 541    case GL_LUMINANCE6_ALPHA2:
 542    case GL_LUMINANCE8_ALPHA8:
 543    case GL_LUMINANCE12_ALPHA4:
 544    case GL_LUMINANCE12_ALPHA12:
 545    case GL_LUMINANCE16_ALPHA16:
 546    case GL_COMPRESSED_LUMINANCE_ALPHA:
 547       if (screen->is_format_supported( screen, PIPE_FORMAT_A8L8_UNORM, target, tex_usage, geom_flags ))
 548          return PIPE_FORMAT_A8L8_UNORM;
 549       return default_rgba_format( screen, target, tex_usage, geom_flags );
 550
 551    case GL_INTENSITY:
 552    case GL_INTENSITY4:
 553    case GL_INTENSITY8:
 554    case GL_INTENSITY12:
 555    case GL_INTENSITY16:
 556    case GL_COMPRESSED_INTENSITY:
 557       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target, tex_usage, geom_flags ))
 558          return PIPE_FORMAT_I8_UNORM;
 559       return default_rgba_format( screen, target, tex_usage, geom_flags );
 560
 561    case GL_YCBCR_MESA:
 562       if (screen->is_format_supported(screen, PIPE_FORMAT_YCBCR,
 563                                       target, tex_usage, geom_flags)) {
 564          return PIPE_FORMAT_YCBCR;
 565       }
 566       if (screen->is_format_supported(screen, PIPE_FORMAT_YCBCR_REV,
 567                                       target, tex_usage, geom_flags)) {
 568          return PIPE_FORMAT_YCBCR_REV;
 569       }
 570       return PIPE_FORMAT_NONE;
 571
 572    case GL_RGB_S3TC:
 573    case GL_RGB4_S3TC:
 574    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 575       return PIPE_FORMAT_DXT1_RGB;
 576
 577    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 578       return PIPE_FORMAT_DXT1_RGBA;
 579
 580    case GL_RGBA_S3TC:
 581    case GL_RGBA4_S3TC:
 582    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 583       return PIPE_FORMAT_DXT3_RGBA;
 584
 585    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 586       return PIPE_FORMAT_DXT5_RGBA;
 587
 588 #if 0
 589    case GL_COMPRESSED_RGB_FXT1_3DFX:
 590       return PIPE_FORMAT_RGB_FXT1;
 591    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 592       return PIPE_FORMAT_RGB_FXT1;
 593 #endif
 594
 595    case GL_DEPTH_COMPONENT16:
 596       if (screen->is_format_supported( screen, PIPE_FORMAT_Z16_UNORM, target, tex_usage, geom_flags ))
 597          return PIPE_FORMAT_Z16_UNORM;
 598       /* fall-through */
 599    case GL_DEPTH_COMPONENT24:
 600       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 601          return PIPE_FORMAT_S8Z24_UNORM;
 602       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 603          return PIPE_FORMAT_Z24S8_UNORM;
 604       /* fall-through */
 605    case GL_DEPTH_COMPONENT32:
 606       if (screen->is_format_supported( screen, PIPE_FORMAT_Z32_UNORM, target, tex_usage, geom_flags ))
 607          return PIPE_FORMAT_Z32_UNORM;
 608       /* fall-through */
 609    case GL_DEPTH_COMPONENT:
 610       return default_depth_format( screen, target, tex_usage, geom_flags );
 611
 612    case GL_STENCIL_INDEX:
 613    case GL_STENCIL_INDEX1_EXT:
 614    case GL_STENCIL_INDEX4_EXT:
 615    case GL_STENCIL_INDEX8_EXT:
 616    case GL_STENCIL_INDEX16_EXT:
 617       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_UNORM, target, tex_usage, geom_flags ))
 618          return PIPE_FORMAT_S8_UNORM;
 619       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 620          return PIPE_FORMAT_S8Z24_UNORM;
 621       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 622          return PIPE_FORMAT_Z24S8_UNORM;
 623       return PIPE_FORMAT_NONE;
 624
 625    case GL_DEPTH_STENCIL_EXT:
 626    case GL_DEPTH24_STENCIL8_EXT:
 627       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 628          return PIPE_FORMAT_S8Z24_UNORM;
 629       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 630          return PIPE_FORMAT_Z24S8_UNORM;
 631       return PIPE_FORMAT_NONE;
 632
 633    case GL_SRGB_EXT:
 634    case GL_SRGB8_EXT:
 635    case GL_COMPRESSED_SRGB_EXT:
 636    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 637    case GL_SRGB_ALPHA_EXT:
 638    case GL_SRGB8_ALPHA8_EXT:
 639       return default_srgba_format( screen, target, tex_usage, geom_flags );
 640    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 641       return PIPE_FORMAT_DXT1_SRGB;
 642    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 643       return PIPE_FORMAT_DXT1_SRGBA;
 644    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 645       return PIPE_FORMAT_DXT3_SRGBA;
 646    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 647       return PIPE_FORMAT_DXT5_SRGBA;
 648
 649    case GL_SLUMINANCE_ALPHA_EXT:
 650    case GL_SLUMINANCE8_ALPHA8_EXT:
 651    case GL_COMPRESSED_SLUMINANCE_EXT:
 652    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 653       if (screen->is_format_supported( screen, PIPE_FORMAT_A8L8_SRGB, target, tex_usage, geom_flags ))
 654          return PIPE_FORMAT_A8L8_SRGB;
 655       return default_srgba_format( screen, target, tex_usage, geom_flags );
 656
 657    case GL_SLUMINANCE_EXT:
 658    case GL_SLUMINANCE8_EXT:
 659       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_SRGB, target, tex_usage, geom_flags ))
 660          return PIPE_FORMAT_L8_SRGB;
 661       return default_srgba_format( screen, target, tex_usage, geom_flags );
 662
 663    default:
 664       return PIPE_FORMAT_NONE;
 665    }
 666 }
 667
 668
 669 static GLboolean
 670 is_depth_or_stencil_format(GLenum internalFormat)
 671 {
 672    switch (internalFormat) {
 673    case GL_DEPTH_COMPONENT:
 674    case GL_DEPTH_COMPONENT16:
 675    case GL_DEPTH_COMPONENT24:
 676    case GL_DEPTH_COMPONENT32:
 677    case GL_STENCIL_INDEX:
 678    case GL_STENCIL_INDEX1_EXT:
 679    case GL_STENCIL_INDEX4_EXT:
 680    case GL_STENCIL_INDEX8_EXT:
 681    case GL_STENCIL_INDEX16_EXT:
 682    case GL_DEPTH_STENCIL_EXT:
 683    case GL_DEPTH24_STENCIL8_EXT:
 684       return GL_TRUE;
 685    default:
 686       return GL_FALSE;
 687    }
 688 }
 689
 690 /**
 691  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 692  */
 693 enum pipe_format
 694 st_choose_renderbuffer_format(struct pipe_screen *screen,
 695                               GLenum internalFormat)
 696 {
 697    uint usage;
 698    if (is_depth_or_stencil_format(internalFormat))
 699       usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
 700    else
 701       usage = PIPE_TEXTURE_USAGE_RENDER_TARGET;
 702    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D, usage);
 703 }
 704
 705
 706 static gl_format
 707 translate_gallium_format_to_mesa_format(enum pipe_format format)
 708 {
 709    switch (format) {
 710    case PIPE_FORMAT_A8R8G8B8_UNORM:
 711       return MESA_FORMAT_ARGB8888;
 712    case PIPE_FORMAT_X8R8G8B8_UNORM:
 713       return MESA_FORMAT_XRGB8888;
 714    case PIPE_FORMAT_A1R5G5B5_UNORM:
 715       return MESA_FORMAT_ARGB1555;
 716    case PIPE_FORMAT_A4R4G4B4_UNORM:
 717       return MESA_FORMAT_ARGB4444;
 718    case PIPE_FORMAT_R5G6B5_UNORM:
 719       return MESA_FORMAT_RGB565;
 720    case PIPE_FORMAT_A8L8_UNORM:
 721       return MESA_FORMAT_AL88;
 722    case PIPE_FORMAT_A8_UNORM:
 723       return MESA_FORMAT_A8;
 724    case PIPE_FORMAT_L8_UNORM:
 725       return MESA_FORMAT_L8;
 726    case PIPE_FORMAT_I8_UNORM:
 727       return MESA_FORMAT_I8;
 728    case PIPE_FORMAT_Z16_UNORM:
 729       return MESA_FORMAT_Z16;
 730    case PIPE_FORMAT_Z32_UNORM:
 731       return MESA_FORMAT_Z32;
 732    case PIPE_FORMAT_Z24S8_UNORM:
 733       return MESA_FORMAT_Z24_S8;
 734    case PIPE_FORMAT_X8Z24_UNORM:
 735       return MESA_FORMAT_X8_Z24;
 736    case PIPE_FORMAT_S8Z24_UNORM:
 737       return MESA_FORMAT_S8_Z24;
 738    case PIPE_FORMAT_YCBCR:
 739       return MESA_FORMAT_YCBCR;
 740    case PIPE_FORMAT_YCBCR_REV:
 741       return MESA_FORMAT_YCBCR_REV;
 742 #if FEATURE_texture_s3tc
 743    case PIPE_FORMAT_DXT1_RGB:
 744       return MESA_FORMAT_RGB_DXT1;
 745    case PIPE_FORMAT_DXT1_RGBA:
 746       return MESA_FORMAT_RGBA_DXT1;
 747    case PIPE_FORMAT_DXT3_RGBA:
 748       return MESA_FORMAT_RGBA_DXT3;
 749    case PIPE_FORMAT_DXT5_RGBA:
 750       return MESA_FORMAT_RGBA_DXT5;
 751 #if FEATURE_EXT_texture_sRGB
 752    case PIPE_FORMAT_DXT1_SRGB:
 753       return MESA_FORMAT_SRGB_DXT1;
 754    case PIPE_FORMAT_DXT1_SRGBA:
 755       return MESA_FORMAT_SRGBA_DXT1;
 756    case PIPE_FORMAT_DXT3_SRGBA:
 757       return MESA_FORMAT_SRGBA_DXT3;
 758    case PIPE_FORMAT_DXT5_SRGBA:
 759       return MESA_FORMAT_SRGBA_DXT5;
 760 #endif
 761 #endif
 762 #if FEATURE_EXT_texture_sRGB
 763    case PIPE_FORMAT_A8L8_SRGB:
 764       return MESA_FORMAT_SLA8;
 765    case PIPE_FORMAT_L8_SRGB:
 766       return MESA_FORMAT_SL8;
 767    case PIPE_FORMAT_R8G8B8_SRGB:
 768       return MESA_FORMAT_SRGB8;
 769    case PIPE_FORMAT_R8G8B8A8_SRGB:
 770       return MESA_FORMAT_SRGBA8;
 771    case PIPE_FORMAT_A8R8G8B8_SRGB:
 772       return MESA_FORMAT_SARGB8;
 773 #endif
 774    /* XXX add additional cases */
 775    default:
 776       assert(0);
 777       return MESA_FORMAT_NONE;
 778    }
 779 }
 780
 781
 782 /**
 783  * Called via ctx->Driver.chooseTextureFormat().
 784  */
 785 gl_format
 786 st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 787                        GLenum format, GLenum type)
 788 {
 789    enum pipe_format pFormat;
 790
 791    (void) format;
 792    (void) type;
 793
 794    pFormat = st_choose_format(ctx->st->pipe->screen, internalFormat,
 795                               PIPE_TEXTURE_2D, PIPE_TEXTURE_USAGE_SAMPLER);
 796    if (pFormat == PIPE_FORMAT_NONE)
 797       return MESA_FORMAT_NONE;
 798
 799    return translate_gallium_format_to_mesa_format(pFormat);
 800 }
 801
 802
 803 /**
 804  * Test if a gallium format is equivalent to a GL format/type.
 805  */
 806 GLboolean
 807 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 808 {
 809    switch (pFormat) {
 810    case PIPE_FORMAT_R8G8B8A8_UNORM:
 811       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 812    case PIPE_FORMAT_B8G8R8A8_UNORM:
 813       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 814    case PIPE_FORMAT_R5G6B5_UNORM:
 815       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 816    /* XXX more combos... */
 817    default:
 818       return GL_FALSE;
 819    }
 820 }