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 "util/u_format.h"
  46 #include "st_context.h"
  47 #include "st_format.h"
  48
  49
  50 static GLuint
  51 format_max_bits(enum pipe_format format)
  52 {
  53    GLuint size = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0);
  54
  55    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 1));
  56    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 2));
  57    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3));
  58    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0));
  59    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1));
  60    return size;
  61 }
  62
  63 static GLuint
  64 format_size(enum pipe_format format)
  65 {
  66    return
  67       util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0) +
  68       util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 1) +
  69       util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 2) +
  70       util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3) +
  71       util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0) +
  72       util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1);
  73 }
  74
  75 /*
  76  * XXX temporary here
  77  */
  78 GLboolean
  79 st_get_format_info(enum pipe_format format, struct pipe_format_info *pinfo)
  80 {
  81    const struct util_format_description *desc;
  82
  83    desc = util_format_description(format);
  84    assert(desc);
  85
  86    if (desc->layout == UTIL_FORMAT_LAYOUT_ARITH ||
  87        desc->layout == UTIL_FORMAT_LAYOUT_ARRAY) {
  88 #if 0
  89       printf("%s\n", pf_name( format ) );
  90 #endif
  91
  92       /* Data type */
  93       if (format == PIPE_FORMAT_A1R5G5B5_UNORM || format == PIPE_FORMAT_R5G6B5_UNORM) {
  94          pinfo->datatype = GL_UNSIGNED_SHORT;
  95       }
  96       else if (format == PIPE_FORMAT_S8Z24_UNORM) {
  97          pinfo->datatype = GL_UNSIGNED_INT_24_8;
  98       }
  99       else {
 100          const GLuint size = format_max_bits(format);
 101          if (size == 8) {
 102             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
 103                pinfo->datatype = GL_UNSIGNED_BYTE;
 104             else
 105                pinfo->datatype = GL_BYTE;
 106          }
 107          else if (size == 16) {
 108             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
 109                pinfo->datatype = GL_UNSIGNED_SHORT;
 110             else
 111                pinfo->datatype = GL_SHORT;
 112          }
 113          else {
 114             assert( size <= 32 );
 115             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
 116                pinfo->datatype = GL_UNSIGNED_INT;
 117             else
 118                pinfo->datatype = GL_INT;
 119          }
 120       }
 121
 122       /* Component bits */
 123       pinfo->red_bits = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0);
 124       pinfo->green_bits = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 1);
 125       pinfo->blue_bits = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 2);
 126       pinfo->alpha_bits = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3);
 127       pinfo->depth_bits = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0);
 128       pinfo->stencil_bits = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1);
 129       pinfo->luminance_bits = 0;
 130       pinfo->intensity_bits = 0;
 131
 132       /* Format size */
 133       pinfo->size = format_size(format) / 8;
 134
 135       /* Luminance & Intensity bits */
 136       if (desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&
 137           desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
 138           desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X) {
 139          if (desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_X) {
 140             pinfo->intensity_bits = pinfo->red_bits;
 141          }
 142          else {
 143             pinfo->luminance_bits = pinfo->red_bits;
 144          }
 145          pinfo->red_bits = 0;
 146       }
 147
 148       pinfo->mesa_format = st_pipe_format_to_mesa_format(format);
 149    }
 150    else if (desc->layout == UTIL_FORMAT_LAYOUT_YUV) {
 151       pinfo->mesa_format = MESA_FORMAT_YCBCR;
 152       pinfo->datatype = GL_UNSIGNED_SHORT;
 153       pinfo->size = 2; /* two bytes per "texel" */
 154    }
 155    else {
 156       /* compressed format? */
 157       assert(0);
 158    }
 159
 160 #if 0
 161    printf(
 162       "ST_FORMAT: R(%u), G(%u), B(%u), A(%u), Z(%u), S(%u)\n",
 163       pinfo->red_bits,
 164       pinfo->green_bits,
 165       pinfo->blue_bits,
 166       pinfo->alpha_bits,
 167       pinfo->depth_bits,
 168       pinfo->stencil_bits );
 169 #endif
 170
 171    pinfo->format = format;
 172
 173    return GL_TRUE;
 174 }
 175
 176
 177 /**
 178  * Return bytes per pixel for the given format.
 179  */
 180 GLuint
 181 st_sizeof_format(enum pipe_format format)
 182 {
 183    struct pipe_format_info info;
 184    if (!st_get_format_info( format, &info )) {
 185       assert( 0 );
 186       return 0;
 187    }
 188    return info.size;
 189 }
 190
 191
 192 /**
 193  * Return bytes per pixel for the given format.
 194  */
 195 GLenum
 196 st_format_datatype(enum pipe_format format)
 197 {
 198    struct pipe_format_info info;
 199    if (!st_get_format_info( format, &info )) {
 200       assert( 0 );
 201       return 0;
 202    }
 203    return info.datatype;
 204 }
 205
 206
 207 enum pipe_format
 208 st_mesa_format_to_pipe_format(gl_format mesaFormat)
 209 {
 210    switch (mesaFormat) {
 211       /* fix this */
 212    case MESA_FORMAT_ARGB8888_REV:
 213    case MESA_FORMAT_ARGB8888:
 214       return PIPE_FORMAT_A8R8G8B8_UNORM;
 215    case MESA_FORMAT_XRGB8888:
 216       return PIPE_FORMAT_X8R8G8B8_UNORM;
 217    case MESA_FORMAT_ARGB1555:
 218       return PIPE_FORMAT_A1R5G5B5_UNORM;
 219    case MESA_FORMAT_ARGB4444:
 220       return PIPE_FORMAT_A4R4G4B4_UNORM;
 221    case MESA_FORMAT_RGB565:
 222       return PIPE_FORMAT_R5G6B5_UNORM;
 223    case MESA_FORMAT_AL88:
 224       return PIPE_FORMAT_A8L8_UNORM;
 225    case MESA_FORMAT_A8:
 226       return PIPE_FORMAT_A8_UNORM;
 227    case MESA_FORMAT_L8:
 228       return PIPE_FORMAT_L8_UNORM;
 229    case MESA_FORMAT_I8:
 230       return PIPE_FORMAT_I8_UNORM;
 231    case MESA_FORMAT_Z16:
 232       return PIPE_FORMAT_Z16_UNORM;
 233    case MESA_FORMAT_Z32:
 234       return PIPE_FORMAT_Z32_UNORM;
 235    case MESA_FORMAT_Z24_S8:
 236       return PIPE_FORMAT_Z24S8_UNORM;
 237    case MESA_FORMAT_S8_Z24:
 238       return PIPE_FORMAT_S8Z24_UNORM;
 239    case MESA_FORMAT_YCBCR:
 240       return PIPE_FORMAT_YCBCR;
 241 #if FEATURE_texture_s3tc
 242    case MESA_FORMAT_RGB_DXT1:
 243       return PIPE_FORMAT_DXT1_RGB;
 244    case MESA_FORMAT_RGBA_DXT1:
 245       return PIPE_FORMAT_DXT1_RGBA;
 246    case MESA_FORMAT_RGBA_DXT3:
 247       return PIPE_FORMAT_DXT3_RGBA;
 248    case MESA_FORMAT_RGBA_DXT5:
 249       return PIPE_FORMAT_DXT5_RGBA;
 250 #if FEATURE_EXT_texture_sRGB
 251    case MESA_FORMAT_SRGB_DXT1:
 252       return PIPE_FORMAT_DXT1_SRGB;
 253    case MESA_FORMAT_SRGBA_DXT1:
 254       return PIPE_FORMAT_DXT1_SRGBA;
 255    case MESA_FORMAT_SRGBA_DXT3:
 256       return PIPE_FORMAT_DXT3_SRGBA;
 257    case MESA_FORMAT_SRGBA_DXT5:
 258       return PIPE_FORMAT_DXT5_SRGBA;
 259 #endif
 260 #endif
 261 #if FEATURE_EXT_texture_sRGB
 262    case MESA_FORMAT_SLA8:
 263       return PIPE_FORMAT_A8L8_SRGB;
 264    case MESA_FORMAT_SL8:
 265       return PIPE_FORMAT_L8_SRGB;
 266    case MESA_FORMAT_SRGB8:
 267       return PIPE_FORMAT_R8G8B8_SRGB;
 268    case MESA_FORMAT_SRGBA8:
 269       return PIPE_FORMAT_R8G8B8A8_SRGB;
 270    case MESA_FORMAT_SARGB8:
 271       return PIPE_FORMAT_A8R8G8B8_SRGB;
 272 #endif
 273    default:
 274       assert(0);
 275       return 0;
 276    }
 277 }
 278
 279
 280 gl_format
 281 st_pipe_format_to_mesa_format(enum pipe_format pipeFormat)
 282 {
 283    switch (pipeFormat) {
 284    case PIPE_FORMAT_A8R8G8B8_UNORM:
 285       return MESA_FORMAT_ARGB8888;
 286    case PIPE_FORMAT_X8R8G8B8_UNORM:
 287       return MESA_FORMAT_XRGB8888;
 288    case PIPE_FORMAT_B8G8R8A8_UNORM:
 289       return MESA_FORMAT_ARGB8888_REV;
 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_Z24X8_UNORM:
 309       return MESA_FORMAT_Z24_X8;
 310    case PIPE_FORMAT_Z24S8_UNORM:
 311       return MESA_FORMAT_Z24_S8;
 312    case PIPE_FORMAT_X8Z24_UNORM:
 313       return MESA_FORMAT_X8_Z24;
 314    case PIPE_FORMAT_S8Z24_UNORM:
 315       return MESA_FORMAT_S8_Z24;
 316    case PIPE_FORMAT_S8_UNORM:
 317       return MESA_FORMAT_S8;
 318
 319    case PIPE_FORMAT_YCBCR:
 320       return MESA_FORMAT_YCBCR;
 321    case PIPE_FORMAT_R16G16B16A16_SNORM:
 322       return MESA_FORMAT_SIGNED_RGBA_16;
 323
 324 #if FEATURE_texture_s3tc
 325    case PIPE_FORMAT_DXT1_RGB:
 326       return MESA_FORMAT_RGB_DXT1;
 327    case PIPE_FORMAT_DXT1_RGBA:
 328       return MESA_FORMAT_RGBA_DXT1;
 329    case PIPE_FORMAT_DXT3_RGBA:
 330       return MESA_FORMAT_RGBA_DXT3;
 331    case PIPE_FORMAT_DXT5_RGBA:
 332       return MESA_FORMAT_RGBA_DXT5;
 333 #if FEATURE_EXT_texture_sRGB
 334    case PIPE_FORMAT_DXT1_SRGB:
 335       return MESA_FORMAT_SRGB_DXT1;
 336    case PIPE_FORMAT_DXT1_SRGBA:
 337       return MESA_FORMAT_SRGBA_DXT1;
 338    case PIPE_FORMAT_DXT3_SRGBA:
 339       return MESA_FORMAT_SRGBA_DXT3;
 340    case PIPE_FORMAT_DXT5_SRGBA:
 341       return MESA_FORMAT_SRGBA_DXT5;
 342 #endif
 343 #endif
 344 #if FEATURE_EXT_texture_sRGB
 345    case PIPE_FORMAT_A8L8_SRGB:
 346       return MESA_FORMAT_SLA8;
 347    case PIPE_FORMAT_L8_SRGB:
 348       return MESA_FORMAT_SL8;
 349    case PIPE_FORMAT_R8G8B8_SRGB:
 350       return MESA_FORMAT_SRGB8;
 351    case PIPE_FORMAT_R8G8B8A8_SRGB:
 352       return MESA_FORMAT_SRGBA8;
 353    case PIPE_FORMAT_A8R8G8B8_SRGB:
 354       return MESA_FORMAT_SARGB8;
 355 #endif
 356    default:
 357       assert(0);
 358       return 0;
 359    }
 360 }
 361
 362
 363 /**
 364  * Find an RGBA format supported by the context/winsys.
 365  */
 366 static enum pipe_format
 367 default_rgba_format(struct pipe_screen *screen,
 368                     enum pipe_texture_target target,
 369                     unsigned tex_usage,
 370                     unsigned geom_flags)
 371 {
 372    static const enum pipe_format colorFormats[] = {
 373       PIPE_FORMAT_A8R8G8B8_UNORM,
 374       PIPE_FORMAT_B8G8R8A8_UNORM,
 375       PIPE_FORMAT_R8G8B8A8_UNORM,
 376       PIPE_FORMAT_R5G6B5_UNORM
 377    };
 378    uint i;
 379    for (i = 0; i < Elements(colorFormats); i++) {
 380       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 381          return colorFormats[i];
 382       }
 383    }
 384    return PIPE_FORMAT_NONE;
 385 }
 386
 387 /**
 388  * Find an RGB format supported by the context/winsys.
 389  */
 390 static enum pipe_format
 391 default_rgb_format(struct pipe_screen *screen,
 392                    enum pipe_texture_target target,
 393                    unsigned tex_usage,
 394                    unsigned geom_flags)
 395 {
 396    static const enum pipe_format colorFormats[] = {
 397       PIPE_FORMAT_X8R8G8B8_UNORM,
 398       PIPE_FORMAT_B8G8R8X8_UNORM,
 399       PIPE_FORMAT_R8G8B8X8_UNORM,
 400       PIPE_FORMAT_A8R8G8B8_UNORM,
 401       PIPE_FORMAT_B8G8R8A8_UNORM,
 402       PIPE_FORMAT_R8G8B8A8_UNORM,
 403       PIPE_FORMAT_R5G6B5_UNORM
 404    };
 405    uint i;
 406    for (i = 0; i < Elements(colorFormats); i++) {
 407       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 408          return colorFormats[i];
 409       }
 410    }
 411    return PIPE_FORMAT_NONE;
 412 }
 413
 414 /**
 415  * Find an sRGBA format supported by the context/winsys.
 416  */
 417 static enum pipe_format
 418 default_srgba_format(struct pipe_screen *screen,
 419                     enum pipe_texture_target target,
 420                     unsigned tex_usage,
 421                     unsigned geom_flags)
 422 {
 423    static const enum pipe_format colorFormats[] = {
 424       PIPE_FORMAT_A8R8G8B8_SRGB,
 425       PIPE_FORMAT_B8G8R8A8_SRGB,
 426       PIPE_FORMAT_R8G8B8A8_SRGB,
 427    };
 428    uint i;
 429    for (i = 0; i < Elements(colorFormats); i++) {
 430       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 431          return colorFormats[i];
 432       }
 433    }
 434    return PIPE_FORMAT_NONE;
 435 }
 436
 437 /**
 438  * Search list of formats for first RGBA format with >8 bits/channel.
 439  */
 440 static enum pipe_format
 441 default_deep_rgba_format(struct pipe_screen *screen,
 442                          enum pipe_texture_target target,
 443                          unsigned tex_usage,
 444                          unsigned geom_flags)
 445 {
 446    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM, target, tex_usage, geom_flags)) {
 447       return PIPE_FORMAT_R16G16B16A16_SNORM;
 448    }
 449    if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 450       return default_rgba_format(screen, target, tex_usage, geom_flags);
 451    else
 452       return PIPE_FORMAT_NONE;
 453 }
 454
 455
 456 /**
 457  * Find an Z format supported by the context/winsys.
 458  */
 459 static enum pipe_format
 460 default_depth_format(struct pipe_screen *screen,
 461                      enum pipe_texture_target target,
 462                      unsigned tex_usage,
 463                      unsigned geom_flags)
 464 {
 465    static const enum pipe_format zFormats[] = {
 466       PIPE_FORMAT_Z16_UNORM,
 467       PIPE_FORMAT_Z32_UNORM,
 468       PIPE_FORMAT_S8Z24_UNORM,
 469       PIPE_FORMAT_Z24S8_UNORM
 470    };
 471    uint i;
 472    for (i = 0; i < Elements(zFormats); i++) {
 473       if (screen->is_format_supported( screen, zFormats[i], target, tex_usage, geom_flags )) {
 474          return zFormats[i];
 475       }
 476    }
 477    return PIPE_FORMAT_NONE;
 478 }
 479
 480
 481 /**
 482  * Given an OpenGL internalFormat value for a texture or surface, return
 483  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
 484  * \param target  one of PIPE_TEXTURE_x
 485  * \param tex_usage  either PIPE_TEXTURE_USAGE_RENDER_TARGET
 486  *                   or PIPE_TEXTURE_USAGE_SAMPLER
 487  */
 488 enum pipe_format
 489 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 490                  enum pipe_texture_target target, unsigned tex_usage)
 491 {
 492    unsigned geom_flags = 0;
 493
 494    switch (internalFormat) {
 495    case 4:
 496    case GL_RGBA:
 497    case GL_COMPRESSED_RGBA:
 498    case GL_RGBA8:
 499    case GL_RGB10_A2:
 500    case GL_RGBA12:
 501       return default_rgba_format( screen, target, tex_usage, geom_flags );
 502    case 3:
 503    case GL_RGB:
 504    case GL_COMPRESSED_RGB:
 505       return default_rgb_format( screen, target, tex_usage, geom_flags );
 506    case GL_RGBA16:
 507       if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 508          return default_deep_rgba_format( screen, target, tex_usage, geom_flags );
 509       else
 510          return default_rgba_format( screen, target, tex_usage, geom_flags );
 511
 512    case GL_RGBA4:
 513    case GL_RGBA2:
 514       if (screen->is_format_supported( screen, PIPE_FORMAT_A4R4G4B4_UNORM, target, tex_usage, geom_flags ))
 515          return PIPE_FORMAT_A4R4G4B4_UNORM;
 516       return default_rgba_format( screen, target, tex_usage, geom_flags );
 517
 518    case GL_RGB5_A1:
 519       if (screen->is_format_supported( screen, PIPE_FORMAT_A1R5G5B5_UNORM, target, tex_usage, geom_flags ))
 520          return PIPE_FORMAT_A1R5G5B5_UNORM;
 521       return default_rgba_format( screen, target, tex_usage, geom_flags );
 522
 523    case GL_RGB8:
 524    case GL_RGB10:
 525    case GL_RGB12:
 526    case GL_RGB16:
 527       return default_rgb_format( screen, target, tex_usage, geom_flags );
 528
 529    case GL_RGB5:
 530    case GL_RGB4:
 531    case GL_R3_G3_B2:
 532       if (screen->is_format_supported( screen, PIPE_FORMAT_R5G6B5_UNORM, target, tex_usage, geom_flags ))
 533          return PIPE_FORMAT_R5G6B5_UNORM;
 534       if (screen->is_format_supported( screen, PIPE_FORMAT_A1R5G5B5_UNORM, target, tex_usage, geom_flags ))
 535          return PIPE_FORMAT_A1R5G5B5_UNORM;
 536       return default_rgba_format( screen, target, tex_usage, geom_flags );
 537
 538    case GL_ALPHA:
 539    case GL_ALPHA4:
 540    case GL_ALPHA8:
 541    case GL_ALPHA12:
 542    case GL_ALPHA16:
 543    case GL_COMPRESSED_ALPHA:
 544       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target, tex_usage, geom_flags ))
 545          return PIPE_FORMAT_A8_UNORM;
 546       return default_rgba_format( screen, target, tex_usage, geom_flags );
 547
 548    case 1:
 549    case GL_LUMINANCE:
 550    case GL_LUMINANCE4:
 551    case GL_LUMINANCE8:
 552    case GL_LUMINANCE12:
 553    case GL_LUMINANCE16:
 554    case GL_COMPRESSED_LUMINANCE:
 555       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target, tex_usage, geom_flags ))
 556          return PIPE_FORMAT_L8_UNORM;
 557       return default_rgba_format( screen, target, tex_usage, geom_flags );
 558
 559    case 2:
 560    case GL_LUMINANCE_ALPHA:
 561    case GL_LUMINANCE4_ALPHA4:
 562    case GL_LUMINANCE6_ALPHA2:
 563    case GL_LUMINANCE8_ALPHA8:
 564    case GL_LUMINANCE12_ALPHA4:
 565    case GL_LUMINANCE12_ALPHA12:
 566    case GL_LUMINANCE16_ALPHA16:
 567    case GL_COMPRESSED_LUMINANCE_ALPHA:
 568       if (screen->is_format_supported( screen, PIPE_FORMAT_A8L8_UNORM, target, tex_usage, geom_flags ))
 569          return PIPE_FORMAT_A8L8_UNORM;
 570       return default_rgba_format( screen, target, tex_usage, geom_flags );
 571
 572    case GL_INTENSITY:
 573    case GL_INTENSITY4:
 574    case GL_INTENSITY8:
 575    case GL_INTENSITY12:
 576    case GL_INTENSITY16:
 577    case GL_COMPRESSED_INTENSITY:
 578       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target, tex_usage, geom_flags ))
 579          return PIPE_FORMAT_I8_UNORM;
 580       return default_rgba_format( screen, target, tex_usage, geom_flags );
 581
 582    case GL_YCBCR_MESA:
 583       if (screen->is_format_supported(screen, PIPE_FORMAT_YCBCR,
 584                                       target, tex_usage, geom_flags)) {
 585          return PIPE_FORMAT_YCBCR;
 586       }
 587       if (screen->is_format_supported(screen, PIPE_FORMAT_YCBCR_REV,
 588                                       target, tex_usage, geom_flags)) {
 589          return PIPE_FORMAT_YCBCR_REV;
 590       }
 591       return PIPE_FORMAT_NONE;
 592
 593    case GL_RGB_S3TC:
 594    case GL_RGB4_S3TC:
 595    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 596       return PIPE_FORMAT_DXT1_RGB;
 597
 598    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 599       return PIPE_FORMAT_DXT1_RGBA;
 600
 601    case GL_RGBA_S3TC:
 602    case GL_RGBA4_S3TC:
 603    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 604       return PIPE_FORMAT_DXT3_RGBA;
 605
 606    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 607       return PIPE_FORMAT_DXT5_RGBA;
 608
 609 #if 0
 610    case GL_COMPRESSED_RGB_FXT1_3DFX:
 611       return PIPE_FORMAT_RGB_FXT1;
 612    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 613       return PIPE_FORMAT_RGB_FXT1;
 614 #endif
 615
 616    case GL_DEPTH_COMPONENT16:
 617       if (screen->is_format_supported( screen, PIPE_FORMAT_Z16_UNORM, target, tex_usage, geom_flags ))
 618          return PIPE_FORMAT_Z16_UNORM;
 619       /* fall-through */
 620    case GL_DEPTH_COMPONENT24:
 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       /* fall-through */
 626    case GL_DEPTH_COMPONENT32:
 627       if (screen->is_format_supported( screen, PIPE_FORMAT_Z32_UNORM, target, tex_usage, geom_flags ))
 628          return PIPE_FORMAT_Z32_UNORM;
 629       /* fall-through */
 630    case GL_DEPTH_COMPONENT:
 631       return default_depth_format( screen, target, tex_usage, geom_flags );
 632
 633    case GL_STENCIL_INDEX:
 634    case GL_STENCIL_INDEX1_EXT:
 635    case GL_STENCIL_INDEX4_EXT:
 636    case GL_STENCIL_INDEX8_EXT:
 637    case GL_STENCIL_INDEX16_EXT:
 638       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_UNORM, target, tex_usage, geom_flags ))
 639          return PIPE_FORMAT_S8_UNORM;
 640       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 641          return PIPE_FORMAT_S8Z24_UNORM;
 642       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 643          return PIPE_FORMAT_Z24S8_UNORM;
 644       return PIPE_FORMAT_NONE;
 645
 646    case GL_DEPTH_STENCIL_EXT:
 647    case GL_DEPTH24_STENCIL8_EXT:
 648       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 649          return PIPE_FORMAT_S8Z24_UNORM;
 650       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 651          return PIPE_FORMAT_Z24S8_UNORM;
 652       return PIPE_FORMAT_NONE;
 653
 654    case GL_SRGB_EXT:
 655    case GL_SRGB8_EXT:
 656    case GL_COMPRESSED_SRGB_EXT:
 657    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 658    case GL_SRGB_ALPHA_EXT:
 659    case GL_SRGB8_ALPHA8_EXT:
 660       return default_srgba_format( screen, target, tex_usage, geom_flags );
 661    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 662       return PIPE_FORMAT_DXT1_SRGB;
 663    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 664       return PIPE_FORMAT_DXT1_SRGBA;
 665    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 666       return PIPE_FORMAT_DXT3_SRGBA;
 667    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 668       return PIPE_FORMAT_DXT5_SRGBA;
 669
 670    case GL_SLUMINANCE_ALPHA_EXT:
 671    case GL_SLUMINANCE8_ALPHA8_EXT:
 672    case GL_COMPRESSED_SLUMINANCE_EXT:
 673    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 674       if (screen->is_format_supported( screen, PIPE_FORMAT_A8L8_SRGB, target, tex_usage, geom_flags ))
 675          return PIPE_FORMAT_A8L8_SRGB;
 676       return default_srgba_format( screen, target, tex_usage, geom_flags );
 677
 678    case GL_SLUMINANCE_EXT:
 679    case GL_SLUMINANCE8_EXT:
 680       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_SRGB, target, tex_usage, geom_flags ))
 681          return PIPE_FORMAT_L8_SRGB;
 682       return default_srgba_format( screen, target, tex_usage, geom_flags );
 683
 684    default:
 685       return PIPE_FORMAT_NONE;
 686    }
 687 }
 688
 689
 690 static GLboolean
 691 is_depth_or_stencil_format(GLenum internalFormat)
 692 {
 693    switch (internalFormat) {
 694    case GL_DEPTH_COMPONENT:
 695    case GL_DEPTH_COMPONENT16:
 696    case GL_DEPTH_COMPONENT24:
 697    case GL_DEPTH_COMPONENT32:
 698    case GL_STENCIL_INDEX:
 699    case GL_STENCIL_INDEX1_EXT:
 700    case GL_STENCIL_INDEX4_EXT:
 701    case GL_STENCIL_INDEX8_EXT:
 702    case GL_STENCIL_INDEX16_EXT:
 703    case GL_DEPTH_STENCIL_EXT:
 704    case GL_DEPTH24_STENCIL8_EXT:
 705       return GL_TRUE;
 706    default:
 707       return GL_FALSE;
 708    }
 709 }
 710
 711 /**
 712  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 713  */
 714 enum pipe_format
 715 st_choose_renderbuffer_format(struct pipe_screen *screen,
 716                               GLenum internalFormat)
 717 {
 718    uint usage;
 719    if (is_depth_or_stencil_format(internalFormat))
 720       usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
 721    else
 722       usage = PIPE_TEXTURE_USAGE_RENDER_TARGET;
 723    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D, usage);
 724 }
 725
 726
 727 static gl_format
 728 translate_gallium_format_to_mesa_format(enum pipe_format format)
 729 {
 730    switch (format) {
 731    case PIPE_FORMAT_A8R8G8B8_UNORM:
 732       return MESA_FORMAT_ARGB8888;
 733    case PIPE_FORMAT_X8R8G8B8_UNORM:
 734       return MESA_FORMAT_XRGB8888;
 735    case PIPE_FORMAT_A1R5G5B5_UNORM:
 736       return MESA_FORMAT_ARGB1555;
 737    case PIPE_FORMAT_A4R4G4B4_UNORM:
 738       return MESA_FORMAT_ARGB4444;
 739    case PIPE_FORMAT_R5G6B5_UNORM:
 740       return MESA_FORMAT_RGB565;
 741    case PIPE_FORMAT_A8L8_UNORM:
 742       return MESA_FORMAT_AL88;
 743    case PIPE_FORMAT_A8_UNORM:
 744       return MESA_FORMAT_A8;
 745    case PIPE_FORMAT_L8_UNORM:
 746       return MESA_FORMAT_L8;
 747    case PIPE_FORMAT_I8_UNORM:
 748       return MESA_FORMAT_I8;
 749    case PIPE_FORMAT_Z16_UNORM:
 750       return MESA_FORMAT_Z16;
 751    case PIPE_FORMAT_Z32_UNORM:
 752       return MESA_FORMAT_Z32;
 753    case PIPE_FORMAT_Z24S8_UNORM:
 754       return MESA_FORMAT_Z24_S8;
 755    case PIPE_FORMAT_X8Z24_UNORM:
 756       return MESA_FORMAT_X8_Z24;
 757    case PIPE_FORMAT_S8Z24_UNORM:
 758       return MESA_FORMAT_S8_Z24;
 759    case PIPE_FORMAT_YCBCR:
 760       return MESA_FORMAT_YCBCR;
 761    case PIPE_FORMAT_YCBCR_REV:
 762       return MESA_FORMAT_YCBCR_REV;
 763 #if FEATURE_texture_s3tc
 764    case PIPE_FORMAT_DXT1_RGB:
 765       return MESA_FORMAT_RGB_DXT1;
 766    case PIPE_FORMAT_DXT1_RGBA:
 767       return MESA_FORMAT_RGBA_DXT1;
 768    case PIPE_FORMAT_DXT3_RGBA:
 769       return MESA_FORMAT_RGBA_DXT3;
 770    case PIPE_FORMAT_DXT5_RGBA:
 771       return MESA_FORMAT_RGBA_DXT5;
 772 #if FEATURE_EXT_texture_sRGB
 773    case PIPE_FORMAT_DXT1_SRGB:
 774       return MESA_FORMAT_SRGB_DXT1;
 775    case PIPE_FORMAT_DXT1_SRGBA:
 776       return MESA_FORMAT_SRGBA_DXT1;
 777    case PIPE_FORMAT_DXT3_SRGBA:
 778       return MESA_FORMAT_SRGBA_DXT3;
 779    case PIPE_FORMAT_DXT5_SRGBA:
 780       return MESA_FORMAT_SRGBA_DXT5;
 781 #endif
 782 #endif
 783 #if FEATURE_EXT_texture_sRGB
 784    case PIPE_FORMAT_A8L8_SRGB:
 785       return MESA_FORMAT_SLA8;
 786    case PIPE_FORMAT_L8_SRGB:
 787       return MESA_FORMAT_SL8;
 788    case PIPE_FORMAT_R8G8B8_SRGB:
 789       return MESA_FORMAT_SRGB8;
 790    case PIPE_FORMAT_R8G8B8A8_SRGB:
 791       return MESA_FORMAT_SRGBA8;
 792    case PIPE_FORMAT_A8R8G8B8_SRGB:
 793       return MESA_FORMAT_SARGB8;
 794 #endif
 795    /* XXX add additional cases */
 796    default:
 797       assert(0);
 798       return MESA_FORMAT_NONE;
 799    }
 800 }
 801
 802
 803 /**
 804  * Called via ctx->Driver.chooseTextureFormat().
 805  */
 806 gl_format
 807 st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 808                        GLenum format, GLenum type)
 809 {
 810    enum pipe_format pFormat;
 811
 812    (void) format;
 813    (void) type;
 814
 815    pFormat = st_choose_format(ctx->st->pipe->screen, internalFormat,
 816                               PIPE_TEXTURE_2D, PIPE_TEXTURE_USAGE_SAMPLER);
 817    if (pFormat == PIPE_FORMAT_NONE)
 818       return MESA_FORMAT_NONE;
 819
 820    return translate_gallium_format_to_mesa_format(pFormat);
 821 }
 822
 823
 824 /**
 825  * Test if a gallium format is equivalent to a GL format/type.
 826  */
 827 GLboolean
 828 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 829 {
 830    switch (pFormat) {
 831    case PIPE_FORMAT_R8G8B8A8_UNORM:
 832       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 833    case PIPE_FORMAT_B8G8R8A8_UNORM:
 834       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 835    case PIPE_FORMAT_R5G6B5_UNORM:
 836       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 837    /* XXX more combos... */
 838    default:
 839       return GL_FALSE;
 840    }
 841 }