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