src/glx/dri_common.c

   1 /*
   2  * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
   3  * Copyright © 2008 Red Hat, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Soft-
   7  * ware"), to deal in the Software without restriction, including without
   8  * limitation the rights to use, copy, modify, merge, publish, distribute,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, provided that the above copyright
  11  * notice(s) and this permission notice appear in all copies of the Soft-
  12  * ware and that both the above copyright notice(s) and this permission
  13  * notice appear in supporting documentation.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
  17  * ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY
  18  * RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN
  19  * THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSE-
  20  * QUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  21  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  22  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFOR-
  23  * MANCE OF THIS SOFTWARE.
  24  *
  25  * Except as contained in this notice, the name of a copyright holder shall
  26  * not be used in advertising or otherwise to promote the sale, use or
  27  * other dealings in this Software without prior written authorization of
  28  * the copyright holder.
  29  *
  30  * Authors:
  31  *   Kevin E. Martin <kevin@precisioninsight.com>
  32  *   Brian Paul <brian@precisioninsight.com>
  33  *   Kristian Høgsberg (krh@redhat.com)
  34  */
  35
  36 #if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
  37
  38 #include <unistd.h>
  39 #include <dlfcn.h>
  40 #include <stdarg.h>
  41 #include "glxclient.h"
  42 #include "dri_common.h"
  43 #include "loader.h"
  44
  45 #ifndef RTLD_NOW
  46 #define RTLD_NOW 0
  47 #endif
  48 #ifndef RTLD_GLOBAL
  49 #define RTLD_GLOBAL 0
  50 #endif
  51
  52 _X_HIDDEN void
  53 dri_message(int level, const char *f, ...)
  54 {
  55    va_list args;
  56    int threshold = _LOADER_WARNING;
  57    const char *libgl_debug;
  58
  59    libgl_debug = getenv("LIBGL_DEBUG");
  60    if (libgl_debug) {
  61       if (strstr(libgl_debug, "quiet"))
  62          threshold = _LOADER_FATAL;
  63       else if (strstr(libgl_debug, "verbose"))
  64          threshold = _LOADER_DEBUG;
  65    }
  66
  67    /* Note that the _LOADER_* levels are lower numbers for more severe. */
  68    if (level <= threshold) {
  69       fprintf(stderr, "libGL%s: ", level <= _LOADER_WARNING ? " error" : "");
  70       va_start(args, f);
  71       vfprintf(stderr, f, args);
  72       va_end(args);
  73    }
  74 }
  75
  76 /**
  77  * Print informational message to stderr if LIBGL_DEBUG is set to
  78  * "verbose".
  79  */
  80 _X_HIDDEN void
  81 InfoMessageF(const char *f, ...)
  82 {
  83    va_list args;
  84    const char *env;
  85
  86    if ((env = getenv("LIBGL_DEBUG")) && strstr(env, "verbose")) {
  87       fprintf(stderr, "libGL: ");
  88       va_start(args, f);
  89       vfprintf(stderr, f, args);
  90       va_end(args);
  91    }
  92 }
  93
  94 /**
  95  * Print error message to stderr if LIBGL_DEBUG is set to anything but
  96  * "quiet", (do nothing if LIBGL_DEBUG is unset).
  97  */
  98 _X_HIDDEN void
  99 ErrorMessageF(const char *f, ...)
 100 {
 101    va_list args;
 102    const char *env;
 103
 104    if ((env = getenv("LIBGL_DEBUG")) && !strstr(env, "quiet")) {
 105       fprintf(stderr, "libGL error: ");
 106       va_start(args, f);
 107       vfprintf(stderr, f, args);
 108       va_end(args);
 109    }
 110 }
 111
 112 /**
 113  * Print error message unless LIBGL_DEBUG is set to "quiet".
 114  *
 115  * The distinction between CriticalErrorMessageF and ErrorMessageF is
 116  * that critcial errors will be printed by default, (even when
 117  * LIBGL_DEBUG is unset).
 118  */
 119 _X_HIDDEN void
 120 CriticalErrorMessageF(const char *f, ...)
 121 {
 122    va_list args;
 123    const char *env;
 124
 125    if (!(env = getenv("LIBGL_DEBUG")) || !strstr(env, "quiet")) {
 126       fprintf(stderr, "libGL error: ");
 127       va_start(args, f);
 128       vfprintf(stderr, f, args);
 129       va_end(args);
 130
 131       if (!env || !strstr(env, "verbose"))
 132          fprintf(stderr, "libGL error: Try again with LIBGL_DEBUG=verbose for more details.\n");
 133    }
 134 }
 135
 136 #ifndef DEFAULT_DRIVER_DIR
 137 /* this is normally defined in Mesa/configs/default with DRI_DRIVER_SEARCH_PATH */
 138 #define DEFAULT_DRIVER_DIR "/usr/local/lib/dri"
 139 #endif
 140
 141 /**
 142  * Try to \c dlopen the named driver.
 143  *
 144  * This function adds the "_dri.so" suffix to the driver name and searches the
 145  * directories specified by the \c LIBGL_DRIVERS_PATH environment variable in
 146  * order to find the driver.
 147  *
 148  * \param driverName - a name like "i965", "radeon", "nouveau", etc.
 149  *
 150  * \returns
 151  * A handle from \c dlopen, or \c NULL if driver file not found.
 152  */
 153 _X_HIDDEN void *
 154 driOpenDriver(const char *driverName)
 155 {
 156    void *glhandle, *handle;
 157    const char *libPaths, *p, *next;
 158    char realDriverName[200];
 159    int len;
 160
 161    /* Attempt to make sure libGL symbols will be visible to the driver */
 162    glhandle = dlopen("libGL.so.1", RTLD_NOW | RTLD_GLOBAL);
 163
 164    libPaths = NULL;
 165    if (geteuid() == getuid()) {
 166       /* don't allow setuid apps to use LIBGL_DRIVERS_PATH */
 167       libPaths = getenv("LIBGL_DRIVERS_PATH");
 168       if (!libPaths)
 169          libPaths = getenv("LIBGL_DRIVERS_DIR");        /* deprecated */
 170    }
 171    if (libPaths == NULL)
 172       libPaths = DEFAULT_DRIVER_DIR;
 173
 174    handle = NULL;
 175    for (p = libPaths; *p; p = next) {
 176       next = strchr(p, ':');
 177       if (next == NULL) {
 178          len = strlen(p);
 179          next = p + len;
 180       }
 181       else {
 182          len = next - p;
 183          next++;
 184       }
 185
 186 #ifdef GLX_USE_TLS
 187       snprintf(realDriverName, sizeof realDriverName,
 188                "%.*s/tls/%s_dri.so", len, p, driverName);
 189       InfoMessageF("OpenDriver: trying %s\n", realDriverName);
 190       handle = dlopen(realDriverName, RTLD_NOW | RTLD_GLOBAL);
 191 #endif
 192
 193       if (handle == NULL) {
 194          snprintf(realDriverName, sizeof realDriverName,
 195                   "%.*s/%s_dri.so", len, p, driverName);
 196          InfoMessageF("OpenDriver: trying %s\n", realDriverName);
 197          handle = dlopen(realDriverName, RTLD_NOW | RTLD_GLOBAL);
 198       }
 199
 200       if (handle != NULL)
 201          break;
 202       else
 203          ErrorMessageF("dlopen %s failed (%s)\n", realDriverName, dlerror());
 204    }
 205
 206    if (!handle)
 207       ErrorMessageF("unable to load driver: %s_dri.so\n", driverName);
 208
 209    if (glhandle)
 210       dlclose(glhandle);
 211
 212    return handle;
 213 }
 214
 215 _X_HIDDEN const __DRIextension **
 216 driGetDriverExtensions(void *handle, const char *driver_name)
 217 {
 218    const __DRIextension **extensions = NULL;
 219    const __DRIextension **(*get_extensions)(void);
 220    char *get_extensions_name;
 221
 222    if (asprintf(&get_extensions_name, "%s_%s",
 223                 __DRI_DRIVER_GET_EXTENSIONS, driver_name) != -1) {
 224       get_extensions = dlsym(handle, get_extensions_name);
 225       if (get_extensions) {
 226          free(get_extensions_name);
 227          return get_extensions();
 228       } else {
 229          InfoMessageF("driver does not expose %s(): %s\n",
 230                       get_extensions_name, dlerror());
 231          free(get_extensions_name);
 232       }
 233    }
 234
 235    extensions = dlsym(handle, __DRI_DRIVER_EXTENSIONS);
 236    if (extensions == NULL) {
 237       ErrorMessageF("driver exports no extensions (%s)\n", dlerror());
 238       return NULL;
 239    }
 240
 241    return extensions;
 242 }
 243
 244 static GLboolean
 245 __driGetMSCRate(__DRIdrawable *draw,
 246                 int32_t * numerator, int32_t * denominator,
 247                 void *loaderPrivate)
 248 {
 249    __GLXDRIdrawable *glxDraw = loaderPrivate;
 250
 251    return __glxGetMscRate(glxDraw->psc, numerator, denominator);
 252 }
 253
 254 _X_HIDDEN const __DRIsystemTimeExtension systemTimeExtension = {
 255    {__DRI_SYSTEM_TIME, __DRI_SYSTEM_TIME_VERSION},
 256    __glXGetUST,
 257    __driGetMSCRate
 258 };
 259
 260 #define __ATTRIB(attrib, field) \
 261     { attrib, offsetof(struct glx_config, field) }
 262
 263 static const struct
 264 {
 265    unsigned int attrib, offset;
 266 } attribMap[] = {
 267    __ATTRIB(__DRI_ATTRIB_BUFFER_SIZE, rgbBits),
 268       __ATTRIB(__DRI_ATTRIB_LEVEL, level),
 269       __ATTRIB(__DRI_ATTRIB_RED_SIZE, redBits),
 270       __ATTRIB(__DRI_ATTRIB_GREEN_SIZE, greenBits),
 271       __ATTRIB(__DRI_ATTRIB_BLUE_SIZE, blueBits),
 272       __ATTRIB(__DRI_ATTRIB_ALPHA_SIZE, alphaBits),
 273       __ATTRIB(__DRI_ATTRIB_DEPTH_SIZE, depthBits),
 274       __ATTRIB(__DRI_ATTRIB_STENCIL_SIZE, stencilBits),
 275       __ATTRIB(__DRI_ATTRIB_ACCUM_RED_SIZE, accumRedBits),
 276       __ATTRIB(__DRI_ATTRIB_ACCUM_GREEN_SIZE, accumGreenBits),
 277       __ATTRIB(__DRI_ATTRIB_ACCUM_BLUE_SIZE, accumBlueBits),
 278       __ATTRIB(__DRI_ATTRIB_ACCUM_ALPHA_SIZE, accumAlphaBits),
 279       __ATTRIB(__DRI_ATTRIB_SAMPLE_BUFFERS, sampleBuffers),
 280       __ATTRIB(__DRI_ATTRIB_SAMPLES, samples),
 281       __ATTRIB(__DRI_ATTRIB_DOUBLE_BUFFER, doubleBufferMode),
 282       __ATTRIB(__DRI_ATTRIB_STEREO, stereoMode),
 283       __ATTRIB(__DRI_ATTRIB_AUX_BUFFERS, numAuxBuffers),
 284 #if 0
 285       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_TYPE, transparentPixel),
 286       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_INDEX_VALUE, transparentIndex),
 287       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_RED_VALUE, transparentRed),
 288       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_GREEN_VALUE, transparentGreen),
 289       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_BLUE_VALUE, transparentBlue),
 290       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_ALPHA_VALUE, transparentAlpha),
 291       __ATTRIB(__DRI_ATTRIB_RED_MASK, redMask),
 292       __ATTRIB(__DRI_ATTRIB_GREEN_MASK, greenMask),
 293       __ATTRIB(__DRI_ATTRIB_BLUE_MASK, blueMask),
 294       __ATTRIB(__DRI_ATTRIB_ALPHA_MASK, alphaMask),
 295 #endif
 296       __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_WIDTH, maxPbufferWidth),
 297       __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_HEIGHT, maxPbufferHeight),
 298       __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_PIXELS, maxPbufferPixels),
 299       __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_WIDTH, optimalPbufferWidth),
 300       __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_HEIGHT, optimalPbufferHeight),
 301 #if 0
 302       __ATTRIB(__DRI_ATTRIB_SWAP_METHOD, swapMethod),
 303 #endif
 304 __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGB, bindToTextureRgb),
 305       __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGBA, bindToTextureRgba),
 306       __ATTRIB(__DRI_ATTRIB_BIND_TO_MIPMAP_TEXTURE,
 307                      bindToMipmapTexture),
 308       __ATTRIB(__DRI_ATTRIB_YINVERTED, yInverted),
 309       __ATTRIB(__DRI_ATTRIB_FRAMEBUFFER_SRGB_CAPABLE, sRGBCapable)
 310 };
 311
 312 static int
 313 scalarEqual(struct glx_config *mode, unsigned int attrib, unsigned int value)
 314 {
 315    unsigned int glxValue;
 316    int i;
 317
 318    for (i = 0; i < ARRAY_SIZE(attribMap); i++)
 319       if (attribMap[i].attrib == attrib) {
 320          glxValue = *(unsigned int *) ((char *) mode + attribMap[i].offset);
 321          return glxValue == GLX_DONT_CARE || glxValue == value;
 322       }
 323
 324    return GL_TRUE;              /* Is a non-existing attribute equal to value? */
 325 }
 326
 327 static int
 328 driConfigEqual(const __DRIcoreExtension *core,
 329                struct glx_config *config, const __DRIconfig *driConfig)
 330 {
 331    unsigned int attrib, value, glxValue;
 332    int i;
 333
 334    i = 0;
 335    while (core->indexConfigAttrib(driConfig, i++, &attrib, &value)) {
 336       switch (attrib) {
 337       case __DRI_ATTRIB_RENDER_TYPE:
 338          glxValue = 0;
 339          if (value & __DRI_ATTRIB_RGBA_BIT) {
 340             glxValue |= GLX_RGBA_BIT;
 341          }
 342          if (value & __DRI_ATTRIB_COLOR_INDEX_BIT) {
 343             glxValue |= GLX_COLOR_INDEX_BIT;
 344          }
 345          if (value & __DRI_ATTRIB_FLOAT_BIT) {
 346             glxValue |= GLX_RGBA_FLOAT_BIT_ARB;
 347          }
 348          if (value & __DRI_ATTRIB_UNSIGNED_FLOAT_BIT) {
 349             glxValue |= GLX_RGBA_UNSIGNED_FLOAT_BIT_EXT;
 350          }
 351          if (glxValue != config->renderType)
 352             return GL_FALSE;
 353          break;
 354
 355       case __DRI_ATTRIB_CONFIG_CAVEAT:
 356          if (value & __DRI_ATTRIB_NON_CONFORMANT_CONFIG)
 357             glxValue = GLX_NON_CONFORMANT_CONFIG;
 358          else if (value & __DRI_ATTRIB_SLOW_BIT)
 359             glxValue = GLX_SLOW_CONFIG;
 360          else
 361             glxValue = GLX_NONE;
 362          if (glxValue != config->visualRating)
 363             return GL_FALSE;
 364          break;
 365
 366       case __DRI_ATTRIB_BIND_TO_TEXTURE_TARGETS:
 367          glxValue = 0;
 368          if (value & __DRI_ATTRIB_TEXTURE_1D_BIT)
 369             glxValue |= GLX_TEXTURE_1D_BIT_EXT;
 370          if (value & __DRI_ATTRIB_TEXTURE_2D_BIT)
 371             glxValue |= GLX_TEXTURE_2D_BIT_EXT;
 372          if (value & __DRI_ATTRIB_TEXTURE_RECTANGLE_BIT)
 373             glxValue |= GLX_TEXTURE_RECTANGLE_BIT_EXT;
 374          if (config->bindToTextureTargets != GLX_DONT_CARE &&
 375              glxValue != config->bindToTextureTargets)
 376             return GL_FALSE;
 377          break;
 378
 379       default:
 380          if (!scalarEqual(config, attrib, value))
 381             return GL_FALSE;
 382       }
 383    }
 384
 385    return GL_TRUE;
 386 }
 387
 388 static struct glx_config *
 389 createDriMode(const __DRIcoreExtension * core,
 390               struct glx_config *config, const __DRIconfig **driConfigs)
 391 {
 392    __GLXDRIconfigPrivate *driConfig;
 393    int i;
 394
 395    for (i = 0; driConfigs[i]; i++) {
 396       if (driConfigEqual(core, config, driConfigs[i]))
 397          break;
 398    }
 399
 400    if (driConfigs[i] == NULL)
 401       return NULL;
 402
 403    driConfig = malloc(sizeof *driConfig);
 404    if (driConfig == NULL)
 405       return NULL;
 406
 407    driConfig->base = *config;
 408    driConfig->driConfig = driConfigs[i];
 409
 410    return &driConfig->base;
 411 }
 412
 413 _X_HIDDEN struct glx_config *
 414 driConvertConfigs(const __DRIcoreExtension * core,
 415                   struct glx_config *configs, const __DRIconfig **driConfigs)
 416 {
 417    struct glx_config head, *tail, *m;
 418
 419    tail = &head;
 420    head.next = NULL;
 421    for (m = configs; m; m = m->next) {
 422       tail->next = createDriMode(core, m, driConfigs);
 423       if (tail->next == NULL) {
 424          /* no matching dri config for m */
 425          continue;
 426       }
 427
 428
 429       tail = tail->next;
 430    }
 431
 432    return head.next;
 433 }
 434
 435 _X_HIDDEN void
 436 driDestroyConfigs(const __DRIconfig **configs)
 437 {
 438    int i;
 439
 440    for (i = 0; configs[i]; i++)
 441       free((__DRIconfig *) configs[i]);
 442    free(configs);
 443 }
 444
 445 _X_HIDDEN __GLXDRIdrawable *
 446 driFetchDrawable(struct glx_context *gc, GLXDrawable glxDrawable)
 447 {
 448    struct glx_display *const priv = __glXInitialize(gc->psc->dpy);
 449    __GLXDRIdrawable *pdraw;
 450    struct glx_screen *psc;
 451
 452    if (priv == NULL)
 453       return NULL;
 454
 455    psc = priv->screens[gc->screen];
 456    if (priv->drawHash == NULL)
 457       return NULL;
 458
 459    if (__glxHashLookup(priv->drawHash, glxDrawable, (void *) &pdraw) == 0) {
 460       pdraw->refcount ++;
 461       return pdraw;
 462    }
 463
 464    pdraw = psc->driScreen->createDrawable(psc, glxDrawable,
 465                                           glxDrawable, gc->config);
 466
 467    if (pdraw == NULL) {
 468       ErrorMessageF("failed to create drawable\n");
 469       return NULL;
 470    }
 471
 472    if (__glxHashInsert(priv->drawHash, glxDrawable, pdraw)) {
 473       (*pdraw->destroyDrawable) (pdraw);
 474       return NULL;
 475    }
 476    pdraw->refcount = 1;
 477
 478    return pdraw;
 479 }
 480
 481 _X_HIDDEN void
 482 driReleaseDrawables(struct glx_context *gc)
 483 {
 484    const struct glx_display *priv = gc->psc->display;
 485    __GLXDRIdrawable *pdraw;
 486
 487    if (priv == NULL)
 488       return;
 489
 490    if (__glxHashLookup(priv->drawHash,
 491                        gc->currentDrawable, (void *) &pdraw) == 0) {
 492       if (pdraw->drawable == pdraw->xDrawable) {
 493          pdraw->refcount --;
 494          if (pdraw->refcount == 0) {
 495             (*pdraw->destroyDrawable)(pdraw);
 496             __glxHashDelete(priv->drawHash, gc->currentDrawable);
 497          }
 498       }
 499    }
 500
 501    if (__glxHashLookup(priv->drawHash,
 502                        gc->currentReadable, (void *) &pdraw) == 0) {
 503       if (pdraw->drawable == pdraw->xDrawable) {
 504          pdraw->refcount --;
 505          if (pdraw->refcount == 0) {
 506             (*pdraw->destroyDrawable)(pdraw);
 507             __glxHashDelete(priv->drawHash, gc->currentReadable);
 508          }
 509       }
 510    }
 511
 512    gc->currentDrawable = None;
 513    gc->currentReadable = None;
 514
 515 }
 516
 517 _X_HIDDEN bool
 518 dri2_convert_glx_attribs(unsigned num_attribs, const uint32_t *attribs,
 519                          unsigned *major_ver, unsigned *minor_ver,
 520                          uint32_t *render_type, uint32_t *flags, unsigned *api,
 521                          int *reset, unsigned *error)
 522 {
 523    unsigned i;
 524    bool got_profile = false;
 525    uint32_t profile;
 526
 527    *major_ver = 1;
 528    *minor_ver = 0;
 529    *render_type = GLX_RGBA_TYPE;
 530    *reset = __DRI_CTX_RESET_NO_NOTIFICATION;
 531    *flags = 0;
 532    *api = __DRI_API_OPENGL;
 533
 534    if (num_attribs == 0) {
 535       return true;
 536    }
 537
 538    /* This is actually an internal error, but what the heck.
 539     */
 540    if (attribs == NULL) {
 541       *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 542       return false;
 543    }
 544
 545    for (i = 0; i < num_attribs; i++) {
 546       switch (attribs[i * 2]) {
 547       case GLX_CONTEXT_MAJOR_VERSION_ARB:
 548          *major_ver = attribs[i * 2 + 1];
 549          break;
 550       case GLX_CONTEXT_MINOR_VERSION_ARB:
 551          *minor_ver = attribs[i * 2 + 1];
 552          break;
 553       case GLX_CONTEXT_FLAGS_ARB:
 554          *flags = attribs[i * 2 + 1];
 555          break;
 556       case GLX_CONTEXT_PROFILE_MASK_ARB:
 557          profile = attribs[i * 2 + 1];
 558          got_profile = true;
 559          break;
 560       case GLX_RENDER_TYPE:
 561          *render_type = attribs[i * 2 + 1];
 562          break;
 563       case GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB:
 564          switch (attribs[i * 2 + 1]) {
 565          case GLX_NO_RESET_NOTIFICATION_ARB:
 566             *reset = __DRI_CTX_RESET_NO_NOTIFICATION;
 567             break;
 568          case GLX_LOSE_CONTEXT_ON_RESET_ARB:
 569             *reset = __DRI_CTX_RESET_LOSE_CONTEXT;
 570             break;
 571          default:
 572             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 573             return false;
 574          }
 575          break;
 576       default:
 577          /* If an unknown attribute is received, fail.
 578           */
 579          *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 580          return false;
 581       }
 582    }
 583
 584    if (!got_profile) {
 585       if (*major_ver > 3 || (*major_ver == 3 && *minor_ver >= 2))
 586          *api = __DRI_API_OPENGL_CORE;
 587    } else {
 588       switch (profile) {
 589       case GLX_CONTEXT_CORE_PROFILE_BIT_ARB:
 590          /* There are no profiles before OpenGL 3.2.  The
 591           * GLX_ARB_create_context_profile spec says:
 592           *
 593           *     "If the requested OpenGL version is less than 3.2,
 594           *     GLX_CONTEXT_PROFILE_MASK_ARB is ignored and the functionality
 595           *     of the context is determined solely by the requested version."
 596           */
 597          *api = (*major_ver > 3 || (*major_ver == 3 && *minor_ver >= 2))
 598             ? __DRI_API_OPENGL_CORE : __DRI_API_OPENGL;
 599          break;
 600       case GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB:
 601          *api = __DRI_API_OPENGL;
 602          break;
 603       case GLX_CONTEXT_ES2_PROFILE_BIT_EXT:
 604          *api = __DRI_API_GLES2;
 605          break;
 606       default:
 607          *error = __DRI_CTX_ERROR_BAD_API;
 608          return false;
 609       }
 610    }
 611
 612    /* Unknown flag value.
 613     */
 614    if (*flags & ~(__DRI_CTX_FLAG_DEBUG | __DRI_CTX_FLAG_FORWARD_COMPATIBLE
 615                   | __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS)) {
 616       *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
 617       return false;
 618    }
 619
 620    /* There are no forward-compatible contexts before OpenGL 3.0.  The
 621     * GLX_ARB_create_context spec says:
 622     *
 623     *     "Forward-compatible contexts are defined only for OpenGL versions
 624     *     3.0 and later."
 625     */
 626    if (*major_ver < 3 && (*flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
 627       *error = __DRI_CTX_ERROR_BAD_FLAG;
 628       return false;
 629    }
 630
 631    if (*major_ver >= 3 && *render_type == GLX_COLOR_INDEX_TYPE) {
 632       *error = __DRI_CTX_ERROR_BAD_FLAG;
 633       return false;
 634    }
 635
 636    /* The GLX_EXT_create_context_es2_profile spec says:
 637     *
 638     *     "... If the version requested is 2.0, and the
 639     *     GLX_CONTEXT_ES2_PROFILE_BIT_EXT bit is set in the
 640     *     GLX_CONTEXT_PROFILE_MASK_ARB attribute (see below), then the context
 641     *     returned will implement OpenGL ES 2.0. This is the only way in which
 642     *     an implementation may request an OpenGL ES 2.0 context."
 643     */
 644    if (*api == __DRI_API_GLES2 && (*major_ver != 2 || *minor_ver != 0)) {
 645       *error = __DRI_CTX_ERROR_BAD_API;
 646       return false;
 647    }
 648
 649    *error = __DRI_CTX_ERROR_SUCCESS;
 650    return true;
 651 }
 652
 653 #endif /* GLX_DIRECT_RENDERING */