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