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_ARGB1555:
 222       return PIPE_FORMAT_A1R5G5B5_UNORM;
 223    case MESA_FORMAT_ARGB4444:
 224       return PIPE_FORMAT_A4R4G4B4_UNORM;
 225    case MESA_FORMAT_RGB565:
 226       return PIPE_FORMAT_R5G6B5_UNORM;
 227    case MESA_FORMAT_AL88:
 228       return PIPE_FORMAT_A8L8_UNORM;
 229    case MESA_FORMAT_A8:
 230       return PIPE_FORMAT_A8_UNORM;
 231    case MESA_FORMAT_L8:
 232       return PIPE_FORMAT_L8_UNORM;
 233    case MESA_FORMAT_I8:
 234       return PIPE_FORMAT_I8_UNORM;
 235    case MESA_FORMAT_Z16:
 236       return PIPE_FORMAT_Z16_UNORM;
 237    case MESA_FORMAT_Z32:
 238       return PIPE_FORMAT_Z32_UNORM;
 239    case MESA_FORMAT_Z24_S8:
 240       return PIPE_FORMAT_Z24S8_UNORM;
 241    case MESA_FORMAT_S8_Z24:
 242       return PIPE_FORMAT_S8Z24_UNORM;
 243    case MESA_FORMAT_YCBCR:
 244       return PIPE_FORMAT_YCBCR;
 245 #if FEATURE_texture_s3tc
 246    case MESA_FORMAT_RGB_DXT1:
 247       return PIPE_FORMAT_DXT1_RGB;
 248    case MESA_FORMAT_RGBA_DXT1:
 249       return PIPE_FORMAT_DXT1_RGBA;
 250    case MESA_FORMAT_RGBA_DXT3:
 251       return PIPE_FORMAT_DXT3_RGBA;
 252    case MESA_FORMAT_RGBA_DXT5:
 253       return PIPE_FORMAT_DXT5_RGBA;
 254 #if FEATURE_EXT_texture_sRGB
 255    case MESA_FORMAT_SRGB_DXT1:
 256       return PIPE_FORMAT_DXT1_SRGB;
 257    case MESA_FORMAT_SRGBA_DXT1:
 258       return PIPE_FORMAT_DXT1_SRGBA;
 259    case MESA_FORMAT_SRGBA_DXT3:
 260       return PIPE_FORMAT_DXT3_SRGBA;
 261    case MESA_FORMAT_SRGBA_DXT5:
 262       return PIPE_FORMAT_DXT5_SRGBA;
 263 #endif
 264 #endif
 265 #if FEATURE_EXT_texture_sRGB
 266    case MESA_FORMAT_SLA8:
 267       return PIPE_FORMAT_A8L8_SRGB;
 268    case MESA_FORMAT_SL8:
 269       return PIPE_FORMAT_L8_SRGB;
 270    case MESA_FORMAT_SRGB8:
 271       return PIPE_FORMAT_R8G8B8_SRGB;
 272    case MESA_FORMAT_SRGBA8:
 273       return PIPE_FORMAT_R8G8B8A8_SRGB;
 274    case MESA_FORMAT_SARGB8:
 275       return PIPE_FORMAT_A8R8G8B8_SRGB;
 276 #endif
 277    default:
 278       assert(0);
 279       return 0;
 280    }
 281 }
 282
 283
 284 gl_format
 285 st_pipe_format_to_mesa_format(enum pipe_format pipeFormat)
 286 {
 287    switch (pipeFormat) {
 288    case PIPE_FORMAT_A8R8G8B8_UNORM:
 289       return MESA_FORMAT_ARGB8888;
 290    case PIPE_FORMAT_A1R5G5B5_UNORM:
 291       return MESA_FORMAT_ARGB1555;
 292    case PIPE_FORMAT_A4R4G4B4_UNORM:
 293       return MESA_FORMAT_ARGB4444;
 294    case PIPE_FORMAT_R5G6B5_UNORM:
 295       return MESA_FORMAT_RGB565;
 296    case PIPE_FORMAT_A8L8_UNORM:
 297       return MESA_FORMAT_AL88;
 298    case PIPE_FORMAT_A8_UNORM:
 299       return MESA_FORMAT_A8;
 300    case PIPE_FORMAT_L8_UNORM:
 301       return MESA_FORMAT_L8;
 302    case PIPE_FORMAT_I8_UNORM:
 303       return MESA_FORMAT_I8;
 304    case PIPE_FORMAT_Z16_UNORM:
 305       return MESA_FORMAT_Z16;
 306    case PIPE_FORMAT_Z32_UNORM:
 307       return MESA_FORMAT_Z32;
 308    case PIPE_FORMAT_Z24S8_UNORM:
 309       return MESA_FORMAT_Z24_S8;
 310    case PIPE_FORMAT_S8Z24_UNORM:
 311       return MESA_FORMAT_S8_Z24;
 312    case PIPE_FORMAT_S8_UNORM:
 313       return MESA_FORMAT_S8;
 314
 315    case PIPE_FORMAT_YCBCR:
 316       return MESA_FORMAT_YCBCR;
 317    case PIPE_FORMAT_R16G16B16A16_SNORM:
 318       return MESA_FORMAT_SIGNED_RGBA_16;
 319
 320 #if FEATURE_texture_s3tc
 321    case PIPE_FORMAT_DXT1_RGB:
 322       return MESA_FORMAT_RGB_DXT1;
 323    case PIPE_FORMAT_DXT1_RGBA:
 324       return MESA_FORMAT_RGBA_DXT1;
 325    case PIPE_FORMAT_DXT3_RGBA:
 326       return MESA_FORMAT_RGBA_DXT3;
 327    case PIPE_FORMAT_DXT5_RGBA:
 328       return MESA_FORMAT_RGBA_DXT5;
 329 #if FEATURE_EXT_texture_sRGB
 330    case PIPE_FORMAT_DXT1_SRGB:
 331       return MESA_FORMAT_SRGB_DXT1;
 332    case PIPE_FORMAT_DXT1_SRGBA:
 333       return MESA_FORMAT_SRGBA_DXT1;
 334    case PIPE_FORMAT_DXT3_SRGBA:
 335       return MESA_FORMAT_SRGBA_DXT3;
 336    case PIPE_FORMAT_DXT5_SRGBA:
 337       return MESA_FORMAT_SRGBA_DXT5;
 338 #endif
 339 #endif
 340 #if FEATURE_EXT_texture_sRGB
 341    case PIPE_FORMAT_A8L8_SRGB:
 342       return MESA_FORMAT_SLA8;
 343    case PIPE_FORMAT_L8_SRGB:
 344       return MESA_FORMAT_SL8;
 345    case PIPE_FORMAT_R8G8B8_SRGB:
 346       return MESA_FORMAT_SRGB8;
 347    case PIPE_FORMAT_R8G8B8A8_SRGB:
 348       return MESA_FORMAT_SRGBA8;
 349    case PIPE_FORMAT_A8R8G8B8_SRGB:
 350       return MESA_FORMAT_SARGB8;
 351 #endif
 352    default:
 353       assert(0);
 354       return 0;
 355    }
 356 }
 357
 358
 359 /**
 360  * Find an RGBA format supported by the context/winsys.
 361  */
 362 static enum pipe_format
 363 default_rgba_format(struct pipe_screen *screen,
 364                     enum pipe_texture_target target,
 365                     unsigned tex_usage,
 366                     unsigned geom_flags)
 367 {
 368    static const enum pipe_format colorFormats[] = {
 369       PIPE_FORMAT_A8R8G8B8_UNORM,
 370       PIPE_FORMAT_B8G8R8A8_UNORM,
 371       PIPE_FORMAT_R8G8B8A8_UNORM,
 372       PIPE_FORMAT_R5G6B5_UNORM
 373    };
 374    uint i;
 375    for (i = 0; i < Elements(colorFormats); i++) {
 376       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 377          return colorFormats[i];
 378       }
 379    }
 380    return PIPE_FORMAT_NONE;
 381 }
 382
 383 /**
 384  * Find an sRGBA format supported by the context/winsys.
 385  */
 386 static enum pipe_format
 387 default_srgba_format(struct pipe_screen *screen,
 388                     enum pipe_texture_target target,
 389                     unsigned tex_usage,
 390                     unsigned geom_flags)
 391 {
 392    static const enum pipe_format colorFormats[] = {
 393       PIPE_FORMAT_A8R8G8B8_SRGB,
 394       PIPE_FORMAT_B8G8R8A8_SRGB,
 395       PIPE_FORMAT_R8G8B8A8_SRGB,
 396    };
 397    uint i;
 398    for (i = 0; i < Elements(colorFormats); i++) {
 399       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 400          return colorFormats[i];
 401       }
 402    }
 403    return PIPE_FORMAT_NONE;
 404 }
 405
 406 /**
 407  * Search list of formats for first RGBA format with >8 bits/channel.
 408  */
 409 static enum pipe_format
 410 default_deep_rgba_format(struct pipe_screen *screen,
 411                          enum pipe_texture_target target,
 412                          unsigned tex_usage,
 413                          unsigned geom_flags)
 414 {
 415    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM, target, tex_usage, geom_flags)) {
 416       return PIPE_FORMAT_R16G16B16A16_SNORM;
 417    }
 418    if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 419       return default_rgba_format(screen, target, tex_usage, geom_flags);
 420    else
 421       return PIPE_FORMAT_NONE;
 422 }
 423
 424
 425 /**
 426  * Find an Z format supported by the context/winsys.
 427  */
 428 static enum pipe_format
 429 default_depth_format(struct pipe_screen *screen,
 430                      enum pipe_texture_target target,
 431                      unsigned tex_usage,
 432                      unsigned geom_flags)
 433 {
 434    static const enum pipe_format zFormats[] = {
 435       PIPE_FORMAT_Z16_UNORM,
 436       PIPE_FORMAT_Z32_UNORM,
 437       PIPE_FORMAT_S8Z24_UNORM,
 438       PIPE_FORMAT_Z24S8_UNORM
 439    };
 440    uint i;
 441    for (i = 0; i < Elements(zFormats); i++) {
 442       if (screen->is_format_supported( screen, zFormats[i], target, tex_usage, geom_flags )) {
 443          return zFormats[i];
 444       }
 445    }
 446    return PIPE_FORMAT_NONE;
 447 }
 448
 449
 450 /**
 451  * Given an OpenGL internalFormat value for a texture or surface, return
 452  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
 453  * \param target  one of PIPE_TEXTURE_x
 454  * \param tex_usage  either PIPE_TEXTURE_USAGE_RENDER_TARGET
 455  *                   or PIPE_TEXTURE_USAGE_SAMPLER
 456  */
 457 enum pipe_format
 458 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 459                  enum pipe_texture_target target, unsigned tex_usage)
 460 {
 461    unsigned geom_flags = 0;
 462
 463    switch (internalFormat) {
 464    case 4:
 465    case GL_RGBA:
 466    case GL_COMPRESSED_RGBA:
 467    case 3:
 468    case GL_RGB:
 469    case GL_COMPRESSED_RGB:
 470    case GL_RGBA8:
 471    case GL_RGB10_A2:
 472    case GL_RGBA12:
 473       return default_rgba_format( screen, target, tex_usage, geom_flags );
 474    case GL_RGBA16:
 475       if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 476          return default_deep_rgba_format( screen, target, tex_usage, geom_flags );
 477       else
 478          return default_rgba_format( screen, target, tex_usage, geom_flags );
 479
 480    case GL_RGBA4:
 481    case GL_RGBA2:
 482       if (screen->is_format_supported( screen, PIPE_FORMAT_A4R4G4B4_UNORM, target, tex_usage, geom_flags ))
 483          return PIPE_FORMAT_A4R4G4B4_UNORM;
 484       return default_rgba_format( screen, target, tex_usage, geom_flags );
 485
 486    case GL_RGB5_A1:
 487       if (screen->is_format_supported( screen, PIPE_FORMAT_A1R5G5B5_UNORM, target, tex_usage, geom_flags ))
 488          return PIPE_FORMAT_A1R5G5B5_UNORM;
 489       return default_rgba_format( screen, target, tex_usage, geom_flags );
 490
 491    case GL_RGB8:
 492    case GL_RGB10:
 493    case GL_RGB12:
 494    case GL_RGB16:
 495       return default_rgba_format( screen, target, tex_usage, geom_flags );
 496
 497    case GL_RGB5:
 498    case GL_RGB4:
 499    case GL_R3_G3_B2:
 500       if (screen->is_format_supported( screen, PIPE_FORMAT_R5G6B5_UNORM, target, tex_usage, geom_flags ))
 501          return PIPE_FORMAT_R5G6B5_UNORM;
 502       if (screen->is_format_supported( screen, PIPE_FORMAT_A1R5G5B5_UNORM, target, tex_usage, geom_flags ))
 503          return PIPE_FORMAT_A1R5G5B5_UNORM;
 504       return default_rgba_format( screen, target, tex_usage, geom_flags );
 505
 506    case GL_ALPHA:
 507    case GL_ALPHA4:
 508    case GL_ALPHA8:
 509    case GL_ALPHA12:
 510    case GL_ALPHA16:
 511    case GL_COMPRESSED_ALPHA:
 512       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target, tex_usage, geom_flags ))
 513          return PIPE_FORMAT_A8_UNORM;
 514       return default_rgba_format( screen, target, tex_usage, geom_flags );
 515
 516    case 1:
 517    case GL_LUMINANCE:
 518    case GL_LUMINANCE4:
 519    case GL_LUMINANCE8:
 520    case GL_LUMINANCE12:
 521    case GL_LUMINANCE16:
 522    case GL_COMPRESSED_LUMINANCE:
 523       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target, tex_usage, geom_flags ))
 524          return PIPE_FORMAT_L8_UNORM;
 525       return default_rgba_format( screen, target, tex_usage, geom_flags );
 526
 527    case 2:
 528    case GL_LUMINANCE_ALPHA:
 529    case GL_LUMINANCE4_ALPHA4:
 530    case GL_LUMINANCE6_ALPHA2:
 531    case GL_LUMINANCE8_ALPHA8:
 532    case GL_LUMINANCE12_ALPHA4:
 533    case GL_LUMINANCE12_ALPHA12:
 534    case GL_LUMINANCE16_ALPHA16:
 535    case GL_COMPRESSED_LUMINANCE_ALPHA:
 536       if (screen->is_format_supported( screen, PIPE_FORMAT_A8L8_UNORM, target, tex_usage, geom_flags ))
 537          return PIPE_FORMAT_A8L8_UNORM;
 538       return default_rgba_format( screen, target, tex_usage, geom_flags );
 539
 540    case GL_INTENSITY:
 541    case GL_INTENSITY4:
 542    case GL_INTENSITY8:
 543    case GL_INTENSITY12:
 544    case GL_INTENSITY16:
 545    case GL_COMPRESSED_INTENSITY:
 546       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target, tex_usage, geom_flags ))
 547          return PIPE_FORMAT_I8_UNORM;
 548       return default_rgba_format( screen, target, tex_usage, geom_flags );
 549
 550    case GL_YCBCR_MESA:
 551       if (screen->is_format_supported(screen, PIPE_FORMAT_YCBCR,
 552                                       target, tex_usage, geom_flags)) {
 553          return PIPE_FORMAT_YCBCR;
 554       }
 555       if (screen->is_format_supported(screen, PIPE_FORMAT_YCBCR_REV,
 556                                       target, tex_usage, geom_flags)) {
 557          return PIPE_FORMAT_YCBCR_REV;
 558       }
 559       return PIPE_FORMAT_NONE;
 560
 561    case GL_RGB_S3TC:
 562    case GL_RGB4_S3TC:
 563    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 564       return PIPE_FORMAT_DXT1_RGB;
 565
 566    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 567       return PIPE_FORMAT_DXT1_RGBA;
 568
 569    case GL_RGBA_S3TC:
 570    case GL_RGBA4_S3TC:
 571    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 572       return PIPE_FORMAT_DXT3_RGBA;
 573
 574    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 575       return PIPE_FORMAT_DXT5_RGBA;
 576
 577 #if 0
 578    case GL_COMPRESSED_RGB_FXT1_3DFX:
 579       return PIPE_FORMAT_RGB_FXT1;
 580    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 581       return PIPE_FORMAT_RGB_FXT1;
 582 #endif
 583
 584    case GL_DEPTH_COMPONENT16:
 585       if (screen->is_format_supported( screen, PIPE_FORMAT_Z16_UNORM, target, tex_usage, geom_flags ))
 586          return PIPE_FORMAT_Z16_UNORM;
 587       /* fall-through */
 588    case GL_DEPTH_COMPONENT24:
 589       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 590          return PIPE_FORMAT_S8Z24_UNORM;
 591       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 592          return PIPE_FORMAT_Z24S8_UNORM;
 593       /* fall-through */
 594    case GL_DEPTH_COMPONENT32:
 595       if (screen->is_format_supported( screen, PIPE_FORMAT_Z32_UNORM, target, tex_usage, geom_flags ))
 596          return PIPE_FORMAT_Z32_UNORM;
 597       /* fall-through */
 598    case GL_DEPTH_COMPONENT:
 599       return default_depth_format( screen, target, tex_usage, geom_flags );
 600
 601    case GL_STENCIL_INDEX:
 602    case GL_STENCIL_INDEX1_EXT:
 603    case GL_STENCIL_INDEX4_EXT:
 604    case GL_STENCIL_INDEX8_EXT:
 605    case GL_STENCIL_INDEX16_EXT:
 606       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_UNORM, target, tex_usage, geom_flags ))
 607          return PIPE_FORMAT_S8_UNORM;
 608       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 609          return PIPE_FORMAT_S8Z24_UNORM;
 610       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 611          return PIPE_FORMAT_Z24S8_UNORM;
 612       return PIPE_FORMAT_NONE;
 613
 614    case GL_DEPTH_STENCIL_EXT:
 615    case GL_DEPTH24_STENCIL8_EXT:
 616       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 617          return PIPE_FORMAT_S8Z24_UNORM;
 618       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 619          return PIPE_FORMAT_Z24S8_UNORM;
 620       return PIPE_FORMAT_NONE;
 621
 622    case GL_SRGB_EXT:
 623    case GL_SRGB8_EXT:
 624    case GL_COMPRESSED_SRGB_EXT:
 625    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 626    case GL_SRGB_ALPHA_EXT:
 627    case GL_SRGB8_ALPHA8_EXT:
 628       return default_srgba_format( screen, target, tex_usage, geom_flags );
 629    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 630       return PIPE_FORMAT_DXT1_SRGB;
 631    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 632       return PIPE_FORMAT_DXT1_SRGBA;
 633    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 634       return PIPE_FORMAT_DXT3_SRGBA;
 635    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 636       return PIPE_FORMAT_DXT5_SRGBA;
 637
 638    case GL_SLUMINANCE_ALPHA_EXT:
 639    case GL_SLUMINANCE8_ALPHA8_EXT:
 640    case GL_COMPRESSED_SLUMINANCE_EXT:
 641    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 642       if (screen->is_format_supported( screen, PIPE_FORMAT_A8L8_SRGB, target, tex_usage, geom_flags ))
 643          return PIPE_FORMAT_A8L8_SRGB;
 644       return default_srgba_format( screen, target, tex_usage, geom_flags );
 645
 646    case GL_SLUMINANCE_EXT:
 647    case GL_SLUMINANCE8_EXT:
 648       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_SRGB, target, tex_usage, geom_flags ))
 649          return PIPE_FORMAT_L8_SRGB;
 650       return default_srgba_format( screen, target, tex_usage, geom_flags );
 651
 652    default:
 653       return PIPE_FORMAT_NONE;
 654    }
 655 }
 656
 657
 658 static GLboolean
 659 is_depth_or_stencil_format(GLenum internalFormat)
 660 {
 661    switch (internalFormat) {
 662    case GL_DEPTH_COMPONENT:
 663    case GL_DEPTH_COMPONENT16:
 664    case GL_DEPTH_COMPONENT24:
 665    case GL_DEPTH_COMPONENT32:
 666    case GL_STENCIL_INDEX:
 667    case GL_STENCIL_INDEX1_EXT:
 668    case GL_STENCIL_INDEX4_EXT:
 669    case GL_STENCIL_INDEX8_EXT:
 670    case GL_STENCIL_INDEX16_EXT:
 671    case GL_DEPTH_STENCIL_EXT:
 672    case GL_DEPTH24_STENCIL8_EXT:
 673       return GL_TRUE;
 674    default:
 675       return GL_FALSE;
 676    }
 677 }
 678
 679 /**
 680  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 681  */
 682 enum pipe_format
 683 st_choose_renderbuffer_format(struct pipe_screen *screen,
 684                               GLenum internalFormat)
 685 {
 686    uint usage;
 687    if (is_depth_or_stencil_format(internalFormat))
 688       usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
 689    else
 690       usage = PIPE_TEXTURE_USAGE_RENDER_TARGET;
 691    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D, usage);
 692 }
 693
 694
 695 static gl_format
 696 translate_gallium_format_to_mesa_format(enum pipe_format format)
 697 {
 698    switch (format) {
 699    case PIPE_FORMAT_A8R8G8B8_UNORM:
 700       return MESA_FORMAT_ARGB8888;
 701    case PIPE_FORMAT_A1R5G5B5_UNORM:
 702       return MESA_FORMAT_ARGB1555;
 703    case PIPE_FORMAT_A4R4G4B4_UNORM:
 704       return MESA_FORMAT_ARGB4444;
 705    case PIPE_FORMAT_R5G6B5_UNORM:
 706       return MESA_FORMAT_RGB565;
 707    case PIPE_FORMAT_A8L8_UNORM:
 708       return MESA_FORMAT_AL88;
 709    case PIPE_FORMAT_A8_UNORM:
 710       return MESA_FORMAT_A8;
 711    case PIPE_FORMAT_L8_UNORM:
 712       return MESA_FORMAT_L8;
 713    case PIPE_FORMAT_I8_UNORM:
 714       return MESA_FORMAT_I8;
 715    case PIPE_FORMAT_Z16_UNORM:
 716       return MESA_FORMAT_Z16;
 717    case PIPE_FORMAT_Z32_UNORM:
 718       return MESA_FORMAT_Z32;
 719    case PIPE_FORMAT_Z24S8_UNORM:
 720       return MESA_FORMAT_Z24_S8;
 721    case PIPE_FORMAT_S8Z24_UNORM:
 722       return MESA_FORMAT_S8_Z24;
 723    case PIPE_FORMAT_YCBCR:
 724       return MESA_FORMAT_YCBCR;
 725    case PIPE_FORMAT_YCBCR_REV:
 726       return MESA_FORMAT_YCBCR_REV;
 727 #if FEATURE_texture_s3tc
 728    case PIPE_FORMAT_DXT1_RGB:
 729       return MESA_FORMAT_RGB_DXT1;
 730    case PIPE_FORMAT_DXT1_RGBA:
 731       return MESA_FORMAT_RGBA_DXT1;
 732    case PIPE_FORMAT_DXT3_RGBA:
 733       return MESA_FORMAT_RGBA_DXT3;
 734    case PIPE_FORMAT_DXT5_RGBA:
 735       return MESA_FORMAT_RGBA_DXT5;
 736 #if FEATURE_EXT_texture_sRGB
 737    case PIPE_FORMAT_DXT1_SRGB:
 738       return MESA_FORMAT_SRGB_DXT1;
 739    case PIPE_FORMAT_DXT1_SRGBA:
 740       return MESA_FORMAT_SRGBA_DXT1;
 741    case PIPE_FORMAT_DXT3_SRGBA:
 742       return MESA_FORMAT_SRGBA_DXT3;
 743    case PIPE_FORMAT_DXT5_SRGBA:
 744       return MESA_FORMAT_SRGBA_DXT5;
 745 #endif
 746 #endif
 747 #if FEATURE_EXT_texture_sRGB
 748    case PIPE_FORMAT_A8L8_SRGB:
 749       return MESA_FORMAT_SLA8;
 750    case PIPE_FORMAT_L8_SRGB:
 751       return MESA_FORMAT_SL8;
 752    case PIPE_FORMAT_R8G8B8_SRGB:
 753       return MESA_FORMAT_SRGB8;
 754    case PIPE_FORMAT_R8G8B8A8_SRGB:
 755       return MESA_FORMAT_SRGBA8;
 756    case PIPE_FORMAT_A8R8G8B8_SRGB:
 757       return MESA_FORMAT_SARGB8;
 758 #endif
 759    /* XXX add additional cases */
 760    default:
 761       assert(0);
 762       return MESA_FORMAT_NONE;
 763    }
 764 }
 765
 766
 767 /**
 768  * Called via ctx->Driver.chooseTextureFormat().
 769  */
 770 gl_format
 771 st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 772                        GLenum format, GLenum type)
 773 {
 774    enum pipe_format pFormat;
 775
 776    (void) format;
 777    (void) type;
 778
 779    pFormat = st_choose_format(ctx->st->pipe->screen, internalFormat,
 780                               PIPE_TEXTURE_2D, PIPE_TEXTURE_USAGE_SAMPLER);
 781    if (pFormat == PIPE_FORMAT_NONE)
 782       return MESA_FORMAT_NONE;
 783
 784    return translate_gallium_format_to_mesa_format(pFormat);
 785 }
 786
 787
 788 /**
 789  * Test if a gallium format is equivalent to a GL format/type.
 790  */
 791 GLboolean
 792 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 793 {
 794    switch (pFormat) {
 795    case PIPE_FORMAT_R8G8B8A8_UNORM:
 796       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 797    case PIPE_FORMAT_B8G8R8A8_UNORM:
 798       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 799    case PIPE_FORMAT_R5G6B5_UNORM:
 800       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 801    /* XXX more combos... */
 802    default:
 803       return GL_FALSE;
 804    }
 805 }