src/egl/main/eglconfig.c

   1 /**
   2  * EGL Configuration (pixel format) functions.
   3  */
   4
   5
   6 #include <stdlib.h>
   7 #include <stdio.h>
   8 #include <string.h>
   9 #include <assert.h>
  10 #include "eglconfig.h"
  11 #include "egldisplay.h"
  12 #include "egldriver.h"
  13 #include "eglglobals.h"
  14 #include "egllog.h"
  15
  16
  17 #define MIN2(A, B)  (((A) < (B)) ? (A) : (B))
  18
  19
  20 /**
  21  * Convert an _EGLConfig to a __GLcontextModes object.
  22  * NOTE: This routine may be incomplete - we're only making sure that
  23  * the fields needed by Mesa (for _mesa_create_context/framebuffer) are
  24  * set correctly.
  25  */
  26 void
  27 _eglConfigToContextModesRec(const _EGLConfig *config, __GLcontextModes *mode)
  28 {
  29    memset(mode, 0, sizeof(*mode));
  30
  31    mode->rgbMode = GL_TRUE; /* no color index */
  32    mode->colorIndexMode = GL_FALSE;
  33    mode->doubleBufferMode = GL_TRUE;  /* always DB for now */
  34    mode->stereoMode = GL_FALSE;
  35
  36    mode->redBits = GET_CONFIG_ATTRIB(config, EGL_RED_SIZE);
  37    mode->greenBits = GET_CONFIG_ATTRIB(config, EGL_GREEN_SIZE);
  38    mode->blueBits = GET_CONFIG_ATTRIB(config, EGL_BLUE_SIZE);
  39    mode->alphaBits = GET_CONFIG_ATTRIB(config, EGL_ALPHA_SIZE);
  40    mode->rgbBits = GET_CONFIG_ATTRIB(config, EGL_BUFFER_SIZE);
  41
  42    /* no rgba masks - fix? */
  43
  44    mode->depthBits = GET_CONFIG_ATTRIB(config, EGL_DEPTH_SIZE);
  45    mode->haveDepthBuffer = mode->depthBits > 0;
  46
  47    mode->stencilBits = GET_CONFIG_ATTRIB(config, EGL_STENCIL_SIZE);
  48    mode->haveStencilBuffer = mode->stencilBits > 0;
  49
  50    /* no accum */
  51
  52    mode->level = GET_CONFIG_ATTRIB(config, EGL_LEVEL);
  53    mode->samples = GET_CONFIG_ATTRIB(config, EGL_SAMPLES);
  54    mode->sampleBuffers = GET_CONFIG_ATTRIB(config, EGL_SAMPLE_BUFFERS);
  55
  56    /* surface type - not really needed */
  57    mode->visualType = GLX_TRUE_COLOR;
  58    mode->renderType = GLX_RGBA_BIT;
  59 }
  60
  61
  62 void
  63 _eglSetConfigAttrib(_EGLConfig *config, EGLint attr, EGLint val)
  64 {
  65    assert(attr >= FIRST_ATTRIB);
  66    assert(attr < FIRST_ATTRIB + MAX_ATTRIBS);
  67    config->Attrib[attr - FIRST_ATTRIB] = val;
  68 }
  69
  70
  71 /**
  72  * Init the given _EGLconfig to default values.
  73  * \param id  the configuration's ID.
  74  */
  75 void
  76 _eglInitConfig(_EGLConfig *config, EGLint id)
  77 {
  78    memset(config, 0, sizeof(*config));
  79    config->Handle = id;
  80    _eglSetConfigAttrib(config, EGL_CONFIG_ID,               id);
  81    _eglSetConfigAttrib(config, EGL_BIND_TO_TEXTURE_RGB,     EGL_DONT_CARE);
  82    _eglSetConfigAttrib(config, EGL_BIND_TO_TEXTURE_RGBA,    EGL_DONT_CARE);
  83    _eglSetConfigAttrib(config, EGL_CONFIG_CAVEAT,           EGL_DONT_CARE);
  84    _eglSetConfigAttrib(config, EGL_NATIVE_RENDERABLE,       EGL_DONT_CARE);
  85    _eglSetConfigAttrib(config, EGL_NATIVE_VISUAL_TYPE,      EGL_DONT_CARE);
  86    _eglSetConfigAttrib(config, EGL_MIN_SWAP_INTERVAL,       EGL_DONT_CARE);
  87    _eglSetConfigAttrib(config, EGL_MAX_SWAP_INTERVAL,       EGL_DONT_CARE);
  88    _eglSetConfigAttrib(config, EGL_SURFACE_TYPE,
  89                    EGL_SCREEN_BIT_MESA | EGL_PBUFFER_BIT |
  90                    EGL_PIXMAP_BIT | EGL_WINDOW_BIT);
  91    _eglSetConfigAttrib(config, EGL_TRANSPARENT_TYPE,        EGL_NONE);
  92    _eglSetConfigAttrib(config, EGL_TRANSPARENT_RED_VALUE,   EGL_DONT_CARE);
  93    _eglSetConfigAttrib(config, EGL_TRANSPARENT_GREEN_VALUE, EGL_DONT_CARE);
  94    _eglSetConfigAttrib(config, EGL_TRANSPARENT_BLUE_VALUE,  EGL_DONT_CARE);
  95 #ifdef EGL_VERSION_1_2
  96    _eglSetConfigAttrib(config, EGL_COLOR_BUFFER_TYPE,       EGL_RGB_BUFFER);
  97    _eglSetConfigAttrib(config, EGL_RENDERABLE_TYPE,         EGL_OPENGL_ES_BIT);
  98 #endif /* EGL_VERSION_1_2 */
  99 }
 100
 101
 102 /**
 103  * Given an EGLConfig handle, return the corresponding _EGLConfig object.
 104  */
 105 _EGLConfig *
 106 _eglLookupConfig(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config)
 107 {
 108    EGLint i;
 109    _EGLDisplay *disp = _eglLookupDisplay(dpy);
 110    for (i = 0; i < disp->NumConfigs; i++) {
 111       if (disp->Configs[i].Handle == config) {
 112           return disp->Configs + i;
 113       }
 114    }
 115    return NULL;
 116 }
 117
 118
 119 /**
 120  * Add the given _EGLConfig to the given display.
 121  */
 122 _EGLConfig *
 123 _eglAddConfig(_EGLDisplay *display, const _EGLConfig *config)
 124 {
 125    _EGLConfig *newConfigs;
 126    EGLint n;
 127
 128    n = display->NumConfigs;
 129
 130    newConfigs = (_EGLConfig *) realloc(display->Configs,
 131                                        (n + 1) * sizeof(_EGLConfig));
 132    if (newConfigs) {
 133       display->Configs = newConfigs;
 134       display->Configs[n] = *config; /* copy struct */
 135       display->Configs[n].Handle = n;
 136       display->NumConfigs++;
 137       return display->Configs + n;
 138    }
 139    else {
 140       return NULL;
 141    }
 142 }
 143
 144
 145 /**
 146  * Parse the attrib_list to fill in the fields of the given _eglConfig
 147  * Return EGL_FALSE if any errors, EGL_TRUE otherwise.
 148  */
 149 EGLBoolean
 150 _eglParseConfigAttribs(_EGLConfig *config, const EGLint *attrib_list)
 151 {
 152    EGLint i;
 153
 154    /* set all config attribs to EGL_DONT_CARE */
 155    for (i = 0; i < MAX_ATTRIBS; i++) {
 156       config->Attrib[i] = EGL_DONT_CARE;
 157    }
 158
 159    for (i = 0; attrib_list && attrib_list[i] != EGL_NONE; i++) {
 160       const EGLint attr = attrib_list[i];
 161       if (attr >= EGL_BUFFER_SIZE &&
 162           attr <= EGL_MAX_SWAP_INTERVAL) {
 163          EGLint k = attr - FIRST_ATTRIB;
 164          assert(k >= 0);
 165          assert(k < MAX_ATTRIBS);
 166          config->Attrib[k] = attrib_list[++i];
 167       }
 168 #ifdef EGL_VERSION_1_2
 169       else if (attr == EGL_COLOR_BUFFER_TYPE) {
 170          EGLint bufType = attrib_list[++i];
 171          if (bufType != EGL_RGB_BUFFER && bufType != EGL_LUMINANCE_BUFFER) {
 172             _eglError(EGL_BAD_ATTRIBUTE, "eglChooseConfig");
 173             return EGL_FALSE;
 174          }
 175          _eglSetConfigAttrib(config, EGL_COLOR_BUFFER_TYPE, bufType);
 176       }
 177       else if (attr == EGL_RENDERABLE_TYPE) {
 178          EGLint renType = attrib_list[++i];
 179          if (renType & ~(EGL_OPENGL_ES_BIT | EGL_OPENVG_BIT)) {
 180             _eglError(EGL_BAD_ATTRIBUTE, "eglChooseConfig");
 181             return EGL_FALSE;
 182          }
 183          _eglSetConfigAttrib(config, EGL_RENDERABLE_TYPE, renType);
 184       }
 185       else if (attr == EGL_ALPHA_MASK_SIZE ||
 186                attr == EGL_LUMINANCE_SIZE) {
 187          EGLint value = attrib_list[++i];
 188          _eglSetConfigAttrib(config, attr, value);
 189       }
 190 #endif /* EGL_VERSION_1_2 */
 191       else {
 192          _eglError(EGL_BAD_ATTRIBUTE, "eglChooseConfig");
 193          return EGL_FALSE;
 194       }
 195    }
 196    return EGL_TRUE;
 197 }
 198
 199
 200 #define EXACT 1
 201 #define ATLEAST 2
 202 #define MASK 3
 203 #define SMALLER 4
 204 #define SPECIAL 5
 205 #define NONE 6
 206
 207 struct sort_info {
 208    EGLint Attribute;
 209    EGLint MatchCriteria;
 210    EGLint SortOrder;
 211 };
 212
 213 /* This encodes the info from Table 3.5 of the EGL spec, ordered by
 214  * Sort Priority.
 215  *
 216  * XXX To do: EGL 1.2 attribs
 217  */
 218 static struct sort_info SortInfo[] = {
 219    { EGL_CONFIG_CAVEAT,           EXACT,   SPECIAL },
 220    { EGL_RED_SIZE,                ATLEAST, SPECIAL },
 221    { EGL_GREEN_SIZE,              ATLEAST, SPECIAL },
 222    { EGL_BLUE_SIZE,               ATLEAST, SPECIAL },
 223    { EGL_ALPHA_SIZE,              ATLEAST, SPECIAL },
 224    { EGL_BUFFER_SIZE,             ATLEAST, SMALLER },
 225    { EGL_SAMPLE_BUFFERS,          ATLEAST, SMALLER },
 226    { EGL_SAMPLES,                 ATLEAST, SMALLER },
 227    { EGL_DEPTH_SIZE,              ATLEAST, SMALLER },
 228    { EGL_STENCIL_SIZE,            ATLEAST, SMALLER },
 229    { EGL_NATIVE_VISUAL_TYPE,      EXACT,   SPECIAL },
 230    { EGL_CONFIG_ID,               EXACT,   SMALLER },
 231    { EGL_BIND_TO_TEXTURE_RGB,     EXACT,   NONE    },
 232    { EGL_BIND_TO_TEXTURE_RGBA,    EXACT,   NONE    },
 233    { EGL_LEVEL,                   EXACT,   NONE    },
 234    { EGL_NATIVE_RENDERABLE,       EXACT,   NONE    },
 235    { EGL_MAX_SWAP_INTERVAL,       EXACT,   NONE    },
 236    { EGL_MIN_SWAP_INTERVAL,       EXACT,   NONE    },
 237    { EGL_SURFACE_TYPE,            MASK,    NONE    },
 238    { EGL_TRANSPARENT_TYPE,        EXACT,   NONE    },
 239    { EGL_TRANSPARENT_RED_VALUE,   EXACT,   NONE    },
 240    { EGL_TRANSPARENT_GREEN_VALUE, EXACT,   NONE    },
 241    { EGL_TRANSPARENT_BLUE_VALUE,  EXACT,   NONE    },
 242    { 0, 0, 0 }
 243 };
 244
 245
 246 /**
 247  * Return EGL_TRUE if the attributes of c meet or exceed the minimums
 248  * specified by min.
 249  */
 250 static EGLBoolean
 251 _eglConfigQualifies(const _EGLConfig *c, const _EGLConfig *min)
 252 {
 253    EGLint i;
 254    for (i = 0; SortInfo[i].Attribute != 0; i++) {
 255       const EGLint mv = GET_CONFIG_ATTRIB(min, SortInfo[i].Attribute);
 256       if (mv != EGL_DONT_CARE) {
 257          const EGLint cv = GET_CONFIG_ATTRIB(c, SortInfo[i].Attribute);
 258          if (SortInfo[i].MatchCriteria == EXACT) {
 259             if (cv != mv) {
 260                return EGL_FALSE;
 261             }
 262          }
 263          else if (SortInfo[i].MatchCriteria == ATLEAST) {
 264             if (cv < mv) {
 265                return EGL_FALSE;
 266             }
 267          }
 268          else {
 269             assert(SortInfo[i].MatchCriteria == MASK);
 270             if ((mv & cv) != mv) {
 271                return EGL_FALSE;
 272             }
 273          }
 274       }
 275    }
 276    return EGL_TRUE;
 277 }
 278
 279
 280 /**
 281  * Compare configs 'a' and 'b' and return -1 if a belongs before b,
 282  * 1 if a belongs after b, or 0 if they're equal.
 283  * Used by qsort().
 284  */
 285 static int
 286 _eglCompareConfigs(const void *a, const void *b)
 287 {
 288    const _EGLConfig *aConfig = (const _EGLConfig *) a;
 289    const _EGLConfig *bConfig = (const _EGLConfig *) b;
 290    EGLint i;
 291
 292    for (i = 0; SortInfo[i].Attribute != 0; i++) {
 293       const EGLint aVal = GET_CONFIG_ATTRIB(aConfig, SortInfo[i].Attribute);
 294       const EGLint bVal = GET_CONFIG_ATTRIB(bConfig, SortInfo[i].Attribute);
 295       if (SortInfo[i].SortOrder == SMALLER) {
 296          if (aVal < bVal)
 297             return -1;
 298          else if (aVal > bVal)
 299             return 1;
 300          /* else, continue examining attribute values */
 301       }
 302       else if (SortInfo[i].SortOrder == SPECIAL) {
 303          if (SortInfo[i].Attribute == EGL_CONFIG_CAVEAT) {
 304             /* values are EGL_NONE, SLOW_CONFIG, or NON_CONFORMANT_CONFIG */
 305             if (aVal < bVal)
 306                return -1;
 307             else if (aVal > bVal)
 308                return 1;
 309          }
 310          else if (SortInfo[i].Attribute == EGL_RED_SIZE ||
 311                   SortInfo[i].Attribute == EGL_GREEN_SIZE ||
 312                   SortInfo[i].Attribute == EGL_BLUE_SIZE ||
 313                   SortInfo[i].Attribute == EGL_ALPHA_SIZE) {
 314             if (aVal > bVal)
 315                return -1;
 316             else if (aVal < bVal)
 317                return 1;
 318          }
 319          else {
 320             assert(SortInfo[i].Attribute == EGL_NATIVE_VISUAL_TYPE);
 321             if (aVal < bVal)
 322                return -1;
 323             else if (aVal > bVal)
 324                return 1;
 325          }
 326       }
 327       else {
 328          assert(SortInfo[i].SortOrder == NONE);
 329          /* continue examining attribute values */
 330       }
 331    }
 332
 333    /* all attributes identical */
 334    return 0;
 335 }
 336
 337
 338 /**
 339  * Typical fallback routine for eglChooseConfig
 340  */
 341 EGLBoolean
 342 _eglChooseConfig(_EGLDriver *drv, EGLDisplay dpy, const EGLint *attrib_list,
 343                  EGLConfig *configs, EGLint config_size, EGLint *num_configs)
 344 {
 345    _EGLDisplay *disp = _eglLookupDisplay(dpy);
 346    _EGLConfig **configList, criteria;
 347    EGLint i, count;
 348
 349    /* parse the attrib_list to initialize criteria */
 350    if (!_eglParseConfigAttribs(&criteria, attrib_list)) {
 351       return EGL_FALSE;
 352    }
 353
 354    /* allocate array of config pointers */
 355    configList = (_EGLConfig **) malloc(config_size * sizeof(_EGLConfig *));
 356    if (!configList) {
 357       _eglError(EGL_BAD_CONFIG, "eglChooseConfig(out of memory)");
 358       return EGL_FALSE;
 359    }
 360
 361    /* make array of pointers to qualifying configs */
 362    for (i = count = 0; i < disp->NumConfigs && count < config_size; i++) {
 363       if (_eglConfigQualifies(disp->Configs + i, &criteria)) {
 364          configList[count++] = disp->Configs + i;
 365       }
 366    }
 367
 368    /* sort array of pointers */
 369    qsort(configList, count, sizeof(_EGLConfig *), _eglCompareConfigs);
 370
 371    /* copy config handles to output array */
 372    for (i = 0; i < count; i++) {
 373       configs[i] = configList[i]->Handle;
 374    }
 375
 376    free(configList);
 377
 378    *num_configs = count;
 379
 380    return EGL_TRUE;
 381 }
 382
 383
 384 /**
 385  * Fallback for eglGetConfigAttrib.
 386  */
 387 EGLBoolean
 388 _eglGetConfigAttrib(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config,
 389                     EGLint attribute, EGLint *value)
 390 {
 391    const _EGLConfig *conf = _eglLookupConfig(drv, dpy, config);
 392    const EGLint k = attribute - FIRST_ATTRIB;
 393    if (k >= 0 && k < MAX_ATTRIBS) {
 394       *value = conf->Attrib[k];
 395       return EGL_TRUE;
 396    }
 397    else {
 398       _eglError(EGL_BAD_ATTRIBUTE, "eglGetConfigAttrib");
 399       return EGL_FALSE;
 400    }
 401 }
 402
 403
 404 /**
 405  * Fallback for eglGetConfigs.
 406  */
 407 EGLBoolean
 408 _eglGetConfigs(_EGLDriver *drv, EGLDisplay dpy, EGLConfig *configs,
 409                EGLint config_size, EGLint *num_config)
 410 {
 411    _EGLDisplay *disp = _eglLookupDisplay(dpy);
 412
 413    if (!drv->Initialized) {
 414       _eglError(EGL_NOT_INITIALIZED, "eglGetConfigs");
 415       return EGL_FALSE;
 416    }
 417
 418    if (configs) {
 419       EGLint i;
 420       *num_config = MIN2(disp->NumConfigs, config_size);
 421       for (i = 0; i < *num_config; i++) {
 422          configs[i] = disp->Configs[i].Handle;
 423       }
 424    }
 425    else {
 426       /* just return total number of supported configs */
 427       *num_config = disp->NumConfigs;
 428    }
 429
 430    return EGL_TRUE;
 431 }
 432
 433
 434 /**
 435  * Creates a set of \c __GLcontextModes that a driver will expose.
 436  *
 437  * A set of \c __GLcontextModes will be created based on the supplied
 438  * parameters.  The number of modes processed will be 2 *
 439  * \c num_depth_stencil_bits * \c num_db_modes.
 440  *
 441  * For the most part, data is just copied from \c depth_bits, \c stencil_bits,
 442  * \c db_modes, and \c visType into each \c __GLcontextModes element.
 443  * However, the meanings of \c fb_format and \c fb_type require further
 444  * explanation.  The \c fb_format specifies which color components are in
 445  * each pixel and what the default order is.  For example, \c GL_RGB specifies
 446  * that red, green, blue are available and red is in the "most significant"
 447  * position and blue is in the "least significant".  The \c fb_type specifies
 448  * the bit sizes of each component and the actual ordering.  For example, if
 449  * \c GL_UNSIGNED_SHORT_5_6_5_REV is specified with \c GL_RGB, bits [15:11]
 450  * are the blue value, bits [10:5] are the green value, and bits [4:0] are
 451  * the red value.
 452  *
 453  * One sublte issue is the combination of \c GL_RGB  or \c GL_BGR and either
 454  * of the \c GL_UNSIGNED_INT_8_8_8_8 modes.  The resulting mask values in the
 455  * \c __GLcontextModes structure is \b identical to the \c GL_RGBA or
 456  * \c GL_BGRA case, except the \c alphaMask is zero.  This means that, as
 457  * far as this routine is concerned, \c GL_RGB with \c GL_UNSIGNED_INT_8_8_8_8
 458  * still uses 32-bits.
 459  *
 460  * If in doubt, look at the tables used in the function.
 461  *
 462  * \param ptr_to_modes  Pointer to a pointer to a linked list of
 463  *                      \c __GLcontextModes.  Upon completion, a pointer to
 464  *                      the next element to be process will be stored here.
 465  *                      If the function fails and returns \c GL_FALSE, this
 466  *                      value will be unmodified, but some elements in the
 467  *                      linked list may be modified.
 468  * \param fb_format     Format of the framebuffer.  Currently only \c GL_RGB,
 469  *                      \c GL_RGBA, \c GL_BGR, and \c GL_BGRA are supported.
 470  * \param fb_type       Type of the pixels in the framebuffer.  Currently only
 471  *                      \c GL_UNSIGNED_SHORT_5_6_5,
 472  *                      \c GL_UNSIGNED_SHORT_5_6_5_REV,
 473  *                      \c GL_UNSIGNED_INT_8_8_8_8, and
 474  *                      \c GL_UNSIGNED_INT_8_8_8_8_REV are supported.
 475  * \param depth_bits    Array of depth buffer sizes to be exposed.
 476  * \param stencil_bits  Array of stencil buffer sizes to be exposed.
 477  * \param num_depth_stencil_bits  Number of entries in both \c depth_bits and
 478  *                      \c stencil_bits.
 479  * \param db_modes      Array of buffer swap modes.  If an element has a
 480  *                      value of \c GLX_NONE, then it represents a
 481  *                      single-buffered mode.  Other valid values are
 482  *                      \c GLX_SWAP_EXCHANGE_OML, \c GLX_SWAP_COPY_OML, and
 483  *                      \c GLX_SWAP_UNDEFINED_OML.  See the
 484  *                      GLX_OML_swap_method extension spec for more details.
 485  * \param num_db_modes  Number of entries in \c db_modes.
 486  * \param visType       GLX visual type.  Usually either \c GLX_TRUE_COLOR or
 487  *                      \c GLX_DIRECT_COLOR.
 488  *
 489  * \returns
 490  * \c GL_TRUE on success or \c GL_FALSE on failure.  Currently the only
 491  * cause of failure is a bad parameter (i.e., unsupported \c fb_format or
 492  * \c fb_type).
 493  *
 494  * \todo
 495  * There is currently no way to support packed RGB modes (i.e., modes with
 496  * exactly 3 bytes per pixel) or floating-point modes.  This could probably
 497  * be done by creating some new, private enums with clever names likes
 498  * \c GL_UNSIGNED_3BYTE_8_8_8, \c GL_4FLOAT_32_32_32_32,
 499  * \c GL_4HALF_16_16_16_16, etc.  We can cross that bridge when we come to it.
 500  */
 501 GLboolean
 502 _eglFillInConfigs(_EGLConfig * configs,
 503                   GLenum fb_format, GLenum fb_type,
 504                   const u_int8_t * depth_bits, const u_int8_t * stencil_bits,
 505                   unsigned num_depth_stencil_bits,
 506                   const GLenum * db_modes, unsigned num_db_modes,
 507                   int visType)
 508 {
 509    static const u_int8_t bits_table[3][4] = {
 510             /* R  G  B  A */
 511             { 5, 6, 5, 0 },  /* Any GL_UNSIGNED_SHORT_5_6_5 */
 512             { 8, 8, 8, 0 },  /* Any RGB with any GL_UNSIGNED_INT_8_8_8_8 */
 513             { 8, 8, 8, 8 }  /* Any RGBA with any GL_UNSIGNED_INT_8_8_8_8 */
 514          };
 515
 516    /* The following arrays are all indexed by the fb_type masked with 0x07.
 517     * Given the four supported fb_type values, this results in valid array
 518     * indices of 3, 4, 5, and 7.
 519     */
 520    static const u_int32_t masks_table_rgb[8][4] = {
 521             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 522             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 523             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 524             {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5       */
 525             {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5_REV   */
 526             {0xFF000000, 0x00FF0000, 0x0000FF00, 0x00000000},  /* 8_8_8_8     */
 527             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 528             {0x000000FF, 0x0000FF00, 0x00FF0000, 0x00000000}  /* 8_8_8_8_REV */
 529          };
 530
 531    static const u_int32_t masks_table_rgba[8][4] = {
 532             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 533             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 534             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 535             {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5       */
 536             {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5_REV   */
 537             {0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF},  /* 8_8_8_8     */
 538             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 539             {0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000},  /* 8_8_8_8_REV */
 540          };
 541
 542    static const u_int32_t masks_table_bgr[8][4] = {
 543             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 544             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 545             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 546             {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5       */
 547             {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5_REV   */
 548             {0x0000FF00, 0x00FF0000, 0xFF000000, 0x00000000},  /* 8_8_8_8     */
 549             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 550             {0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000},  /* 8_8_8_8_REV */
 551          };
 552
 553    static const u_int32_t masks_table_bgra[8][4] = {
 554             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 555             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 556             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 557             {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5       */
 558             {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5_REV   */
 559             {0x0000FF00, 0x00FF0000, 0xFF000000, 0x000000FF},  /* 8_8_8_8     */
 560             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 561             {0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000},  /* 8_8_8_8_REV */
 562          };
 563
 564    static const u_int8_t bytes_per_pixel[8] = {
 565             0, 0, 0, 2, 2, 4, 0, 4
 566          };
 567
 568    const u_int8_t * bits;
 569    const u_int32_t * masks;
 570    const int index = fb_type & 0x07;
 571    _EGLConfig *config;
 572    unsigned i;
 573    unsigned j;
 574    unsigned k;
 575
 576    if ( bytes_per_pixel[index] == 0 ) {
 577       _eglLog(_EGL_INFO,
 578               "[%s:%u] Framebuffer type 0x%04x has 0 bytes per pixel.",
 579               __FUNCTION__, __LINE__, fb_type);
 580       return GL_FALSE;
 581    }
 582
 583    /* Valid types are GL_UNSIGNED_SHORT_5_6_5 and GL_UNSIGNED_INT_8_8_8_8 and
 584     * the _REV versions.
 585     *
 586     * Valid formats are GL_RGBA, GL_RGB, and GL_BGRA.
 587     */
 588    switch ( fb_format ) {
 589    case GL_RGB:
 590       bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[1];
 591       masks = masks_table_rgb[index];
 592       break;
 593
 594    case GL_RGBA:
 595       bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[2];
 596       masks = masks_table_rgba[index];
 597       break;
 598
 599    case GL_BGR:
 600       bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[1];
 601       masks = masks_table_bgr[index];
 602       break;
 603
 604    case GL_BGRA:
 605       bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[2];
 606       masks = masks_table_bgra[index];
 607       break;
 608
 609    default:
 610       _eglLog(_EGL_WARNING,
 611               "[%s:%u] Framebuffer format 0x%04x is not GL_RGB, GL_RGBA, GL_BGR, or GL_BGRA.",
 612               __FUNCTION__, __LINE__, fb_format);
 613       return GL_FALSE;
 614    }
 615
 616    config = configs;
 617    for (k = 0; k < num_depth_stencil_bits; k++) {
 618       for (i = 0; i < num_db_modes; i++)  {
 619          for (j = 0; j < 2; j++) {
 620             _eglSetConfigAttrib(config, EGL_RED_SIZE, bits[0]);
 621             _eglSetConfigAttrib(config, EGL_GREEN_SIZE, bits[1]);
 622             _eglSetConfigAttrib(config, EGL_BLUE_SIZE, bits[2]);
 623             _eglSetConfigAttrib(config, EGL_ALPHA_SIZE, bits[3]);
 624             _eglSetConfigAttrib(config, EGL_BUFFER_SIZE,
 625                                 bits[0] + bits[1] + bits[2] + bits[3]);
 626
 627             _eglSetConfigAttrib(config, EGL_STENCIL_SIZE, stencil_bits[k]);
 628             _eglSetConfigAttrib(config, EGL_DEPTH_SIZE, depth_bits[i]);
 629
 630             _eglSetConfigAttrib(config, EGL_SURFACE_TYPE, EGL_SCREEN_BIT_MESA |
 631                          EGL_PBUFFER_BIT | EGL_PIXMAP_BIT | EGL_WINDOW_BIT);
 632
 633             config++;
 634          }
 635       }
 636    }
 637    return GL_TRUE;
 638 }