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 #ifndef DEFAULT_DRIVER_DIR
  77 /* this is normally defined in Mesa/configs/default with DRI_DRIVER_SEARCH_PATH */
  78 #define DEFAULT_DRIVER_DIR "/usr/local/lib/dri"
  79 #endif
  80
  81 /**
  82  * Try to \c dlopen the named driver.
  83  *
  84  * This function adds the "_dri.so" suffix to the driver name and searches the
  85  * directories specified by the \c LIBGL_DRIVERS_PATH environment variable in
  86  * order to find the driver.
  87  *
  88  * \param driverName - a name like "i965", "radeon", "nouveau", etc.
  89  *
  90  * \returns
  91  * A handle from \c dlopen, or \c NULL if driver file not found.
  92  */
  93 _X_HIDDEN void *
  94 driOpenDriver(const char *driverName)
  95 {
  96    void *glhandle, *handle;
  97    const char *libPaths, *p, *next;
  98    char realDriverName[200];
  99    int len;
 100
 101    /* Attempt to make sure libGL symbols will be visible to the driver */
 102    glhandle = dlopen("libGL.so.1", RTLD_NOW | RTLD_GLOBAL);
 103
 104    libPaths = NULL;
 105    if (geteuid() == getuid()) {
 106       /* don't allow setuid apps to use LIBGL_DRIVERS_PATH */
 107       libPaths = getenv("LIBGL_DRIVERS_PATH");
 108       if (!libPaths)
 109          libPaths = getenv("LIBGL_DRIVERS_DIR");        /* deprecated */
 110    }
 111    if (libPaths == NULL)
 112       libPaths = DEFAULT_DRIVER_DIR;
 113
 114    handle = NULL;
 115    for (p = libPaths; *p; p = next) {
 116       next = strchr(p, ':');
 117       if (next == NULL) {
 118          len = strlen(p);
 119          next = p + len;
 120       }
 121       else {
 122          len = next - p;
 123          next++;
 124       }
 125
 126 #ifdef GLX_USE_TLS
 127       snprintf(realDriverName, sizeof realDriverName,
 128                "%.*s/tls/%s_dri.so", len, p, driverName);
 129       InfoMessageF("OpenDriver: trying %s\n", realDriverName);
 130       handle = dlopen(realDriverName, RTLD_NOW | RTLD_GLOBAL);
 131 #endif
 132
 133       if (handle == NULL) {
 134          snprintf(realDriverName, sizeof realDriverName,
 135                   "%.*s/%s_dri.so", len, p, driverName);
 136          InfoMessageF("OpenDriver: trying %s\n", realDriverName);
 137          handle = dlopen(realDriverName, RTLD_NOW | RTLD_GLOBAL);
 138       }
 139
 140       if (handle != NULL)
 141          break;
 142       else
 143          InfoMessageF("dlopen %s failed (%s)\n", realDriverName, dlerror());
 144    }
 145
 146    if (!handle)
 147       ErrorMessageF("unable to load driver: %s_dri.so\n", driverName);
 148
 149    if (glhandle)
 150       dlclose(glhandle);
 151
 152    return handle;
 153 }
 154
 155 _X_HIDDEN const __DRIextension **
 156 driGetDriverExtensions(void *handle, const char *driver_name)
 157 {
 158    const __DRIextension **extensions = NULL;
 159    const __DRIextension **(*get_extensions)(void);
 160    char *get_extensions_name;
 161
 162    if (asprintf(&get_extensions_name, "%s_%s",
 163                 __DRI_DRIVER_GET_EXTENSIONS, driver_name) != -1) {
 164       get_extensions = dlsym(handle, get_extensions_name);
 165       if (get_extensions) {
 166          free(get_extensions_name);
 167          return get_extensions();
 168       } else {
 169          InfoMessageF("driver does not expose %s(): %s\n",
 170                       get_extensions_name, dlerror());
 171          free(get_extensions_name);
 172       }
 173    }
 174
 175    extensions = dlsym(handle, __DRI_DRIVER_EXTENSIONS);
 176    if (extensions == NULL) {
 177       ErrorMessageF("driver exports no extensions (%s)\n", dlerror());
 178       return NULL;
 179    }
 180
 181    return extensions;
 182 }
 183
 184 static GLboolean
 185 __driGetMSCRate(__DRIdrawable *draw,
 186                 int32_t * numerator, int32_t * denominator,
 187                 void *loaderPrivate)
 188 {
 189    __GLXDRIdrawable *glxDraw = loaderPrivate;
 190
 191    return __glxGetMscRate(glxDraw->psc, numerator, denominator);
 192 }
 193
 194 _X_HIDDEN const __DRIsystemTimeExtension systemTimeExtension = {
 195    .base = {__DRI_SYSTEM_TIME, 1 },
 196
 197    .getUST              = __glXGetUST,
 198    .getMSCRate          = __driGetMSCRate
 199 };
 200
 201 #define __ATTRIB(attrib, field) \
 202     { attrib, offsetof(struct glx_config, field) }
 203
 204 static const struct
 205 {
 206    unsigned int attrib, offset;
 207 } attribMap[] = {
 208    __ATTRIB(__DRI_ATTRIB_BUFFER_SIZE, rgbBits),
 209       __ATTRIB(__DRI_ATTRIB_LEVEL, level),
 210       __ATTRIB(__DRI_ATTRIB_RED_SIZE, redBits),
 211       __ATTRIB(__DRI_ATTRIB_GREEN_SIZE, greenBits),
 212       __ATTRIB(__DRI_ATTRIB_BLUE_SIZE, blueBits),
 213       __ATTRIB(__DRI_ATTRIB_ALPHA_SIZE, alphaBits),
 214       __ATTRIB(__DRI_ATTRIB_DEPTH_SIZE, depthBits),
 215       __ATTRIB(__DRI_ATTRIB_STENCIL_SIZE, stencilBits),
 216       __ATTRIB(__DRI_ATTRIB_ACCUM_RED_SIZE, accumRedBits),
 217       __ATTRIB(__DRI_ATTRIB_ACCUM_GREEN_SIZE, accumGreenBits),
 218       __ATTRIB(__DRI_ATTRIB_ACCUM_BLUE_SIZE, accumBlueBits),
 219       __ATTRIB(__DRI_ATTRIB_ACCUM_ALPHA_SIZE, accumAlphaBits),
 220       __ATTRIB(__DRI_ATTRIB_SAMPLE_BUFFERS, sampleBuffers),
 221       __ATTRIB(__DRI_ATTRIB_SAMPLES, samples),
 222       __ATTRIB(__DRI_ATTRIB_DOUBLE_BUFFER, doubleBufferMode),
 223       __ATTRIB(__DRI_ATTRIB_STEREO, stereoMode),
 224       __ATTRIB(__DRI_ATTRIB_AUX_BUFFERS, numAuxBuffers),
 225 #if 0
 226       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_TYPE, transparentPixel),
 227       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_INDEX_VALUE, transparentIndex),
 228       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_RED_VALUE, transparentRed),
 229       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_GREEN_VALUE, transparentGreen),
 230       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_BLUE_VALUE, transparentBlue),
 231       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_ALPHA_VALUE, transparentAlpha),
 232       __ATTRIB(__DRI_ATTRIB_RED_MASK, redMask),
 233       __ATTRIB(__DRI_ATTRIB_GREEN_MASK, greenMask),
 234       __ATTRIB(__DRI_ATTRIB_BLUE_MASK, blueMask),
 235       __ATTRIB(__DRI_ATTRIB_ALPHA_MASK, alphaMask),
 236 #endif
 237       __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_WIDTH, maxPbufferWidth),
 238       __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_HEIGHT, maxPbufferHeight),
 239       __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_PIXELS, maxPbufferPixels),
 240       __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_WIDTH, optimalPbufferWidth),
 241       __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_HEIGHT, optimalPbufferHeight),
 242 #if 0
 243       __ATTRIB(__DRI_ATTRIB_SWAP_METHOD, swapMethod),
 244 #endif
 245 __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGB, bindToTextureRgb),
 246       __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGBA, bindToTextureRgba),
 247       __ATTRIB(__DRI_ATTRIB_BIND_TO_MIPMAP_TEXTURE,
 248                      bindToMipmapTexture),
 249       __ATTRIB(__DRI_ATTRIB_YINVERTED, yInverted),
 250       __ATTRIB(__DRI_ATTRIB_FRAMEBUFFER_SRGB_CAPABLE, sRGBCapable)
 251 };
 252
 253 static int
 254 scalarEqual(struct glx_config *mode, unsigned int attrib, unsigned int value)
 255 {
 256    unsigned int glxValue;
 257    int i;
 258
 259    for (i = 0; i < ARRAY_SIZE(attribMap); i++)
 260       if (attribMap[i].attrib == attrib) {
 261          glxValue = *(unsigned int *) ((char *) mode + attribMap[i].offset);
 262          return glxValue == GLX_DONT_CARE || glxValue == value;
 263       }
 264
 265    return GL_TRUE;              /* Is a non-existing attribute equal to value? */
 266 }
 267
 268 static int
 269 scalarGreaterEqual(struct glx_config *mode, unsigned int attrib, unsigned int value)
 270 {
 271    unsigned int glxValue;
 272    int i;
 273
 274    for (i = 0; i < ARRAY_SIZE(attribMap); i++)
 275       if (attribMap[i].attrib == attrib) {
 276          glxValue = *(unsigned int *) ((char *) mode + attribMap[i].offset);
 277          return glxValue == GLX_DONT_CARE || glxValue >= value;
 278       }
 279
 280    return GL_TRUE;              /* Is a non-existing attribute greater than or equal to value? */
 281 }
 282
 283 static int
 284 booleanSupported(struct glx_config *mode, unsigned int attrib, unsigned int value)
 285 {
 286    unsigned int glxValue;
 287    int i;
 288
 289    for (i = 0; i < ARRAY_SIZE(attribMap); i++)
 290       if (attribMap[i].attrib == attrib) {
 291          glxValue = *(unsigned int *) ((char *) mode + attribMap[i].offset);
 292          return glxValue == GLX_DONT_CARE || glxValue;
 293       }
 294
 295    return GL_TRUE;              /* Is a non-existing attribute supported? */
 296 }
 297
 298 static int
 299 driConfigEqual(const __DRIcoreExtension *core,
 300                struct glx_config *config, const __DRIconfig *driConfig)
 301 {
 302    unsigned int attrib, value, glxValue;
 303    int i;
 304
 305    i = 0;
 306    while (core->indexConfigAttrib(driConfig, i++, &attrib, &value)) {
 307       switch (attrib) {
 308       case __DRI_ATTRIB_RENDER_TYPE:
 309          glxValue = 0;
 310          if (value & __DRI_ATTRIB_RGBA_BIT) {
 311             glxValue |= GLX_RGBA_BIT;
 312          }
 313          if (value & __DRI_ATTRIB_COLOR_INDEX_BIT) {
 314             glxValue |= GLX_COLOR_INDEX_BIT;
 315          }
 316          if (value & __DRI_ATTRIB_FLOAT_BIT) {
 317             glxValue |= GLX_RGBA_FLOAT_BIT_ARB;
 318          }
 319          if (value & __DRI_ATTRIB_UNSIGNED_FLOAT_BIT) {
 320             glxValue |= GLX_RGBA_UNSIGNED_FLOAT_BIT_EXT;
 321          }
 322          if (glxValue != config->renderType)
 323             return GL_FALSE;
 324          break;
 325
 326       case __DRI_ATTRIB_CONFIG_CAVEAT:
 327          if (value & __DRI_ATTRIB_NON_CONFORMANT_CONFIG)
 328             glxValue = GLX_NON_CONFORMANT_CONFIG;
 329          else if (value & __DRI_ATTRIB_SLOW_BIT)
 330             glxValue = GLX_SLOW_CONFIG;
 331          else
 332             glxValue = GLX_NONE;
 333          if (glxValue != config->visualRating)
 334             return GL_FALSE;
 335          break;
 336
 337       case __DRI_ATTRIB_BIND_TO_TEXTURE_TARGETS:
 338          glxValue = 0;
 339          if (value & __DRI_ATTRIB_TEXTURE_1D_BIT)
 340             glxValue |= GLX_TEXTURE_1D_BIT_EXT;
 341          if (value & __DRI_ATTRIB_TEXTURE_2D_BIT)
 342             glxValue |= GLX_TEXTURE_2D_BIT_EXT;
 343          if (value & __DRI_ATTRIB_TEXTURE_RECTANGLE_BIT)
 344             glxValue |= GLX_TEXTURE_RECTANGLE_BIT_EXT;
 345          if (config->bindToTextureTargets != GLX_DONT_CARE &&
 346              glxValue != (config->bindToTextureTargets & glxValue))
 347             return GL_FALSE;
 348          break;
 349
 350       case __DRI_ATTRIB_STENCIL_SIZE:
 351       case __DRI_ATTRIB_ACCUM_RED_SIZE:
 352       case __DRI_ATTRIB_ACCUM_GREEN_SIZE:
 353       case __DRI_ATTRIB_ACCUM_BLUE_SIZE:
 354       case __DRI_ATTRIB_ACCUM_ALPHA_SIZE:
 355          if (value != 0 && !scalarEqual(config, attrib, value))
 356             return GL_FALSE;
 357          break;
 358
 359       case __DRI_ATTRIB_DOUBLE_BUFFER:
 360       case __DRI_ATTRIB_BIND_TO_TEXTURE_RGB:
 361       case __DRI_ATTRIB_BIND_TO_TEXTURE_RGBA:
 362       case __DRI_ATTRIB_BIND_TO_MIPMAP_TEXTURE:
 363       case __DRI_ATTRIB_FRAMEBUFFER_SRGB_CAPABLE:
 364           if (value && !booleanSupported(config, attrib, value))
 365             return GL_FALSE;
 366           break;
 367
 368       case __DRI_ATTRIB_SAMPLE_BUFFERS:
 369       case __DRI_ATTRIB_SAMPLES:
 370       case __DRI_ATTRIB_AUX_BUFFERS:
 371       case __DRI_ATTRIB_MAX_PBUFFER_WIDTH:
 372       case __DRI_ATTRIB_MAX_PBUFFER_HEIGHT:
 373       case __DRI_ATTRIB_MAX_PBUFFER_PIXELS:
 374          if (!scalarGreaterEqual(config, attrib, value))
 375             return GL_FALSE;
 376
 377       default:
 378          if (!scalarEqual(config, attrib, value))
 379             return GL_FALSE;
 380       }
 381    }
 382
 383    return GL_TRUE;
 384 }
 385
 386 static struct glx_config *
 387 createDriMode(const __DRIcoreExtension * core,
 388               struct glx_config *config, const __DRIconfig **driConfigs)
 389 {
 390    __GLXDRIconfigPrivate *driConfig;
 391    int i;
 392
 393    for (i = 0; driConfigs[i]; i++) {
 394       if (driConfigEqual(core, config, driConfigs[i]))
 395          break;
 396    }
 397
 398    if (driConfigs[i] == NULL)
 399       return NULL;
 400
 401    driConfig = malloc(sizeof *driConfig);
 402    if (driConfig == NULL)
 403       return NULL;
 404
 405    driConfig->base = *config;
 406    driConfig->driConfig = driConfigs[i];
 407
 408    return &driConfig->base;
 409 }
 410
 411 _X_HIDDEN struct glx_config *
 412 driConvertConfigs(const __DRIcoreExtension * core,
 413                   struct glx_config *configs, const __DRIconfig **driConfigs)
 414 {
 415    struct glx_config head, *tail, *m;
 416
 417    tail = &head;
 418    head.next = NULL;
 419    for (m = configs; m; m = m->next) {
 420       tail->next = createDriMode(core, m, driConfigs);
 421       if (tail->next == NULL) {
 422          /* no matching dri config for m */
 423          continue;
 424       }
 425
 426
 427       tail = tail->next;
 428    }
 429
 430    return head.next;
 431 }
 432
 433 _X_HIDDEN void
 434 driDestroyConfigs(const __DRIconfig **configs)
 435 {
 436    int i;
 437
 438    for (i = 0; configs[i]; i++)
 439       free((__DRIconfig *) configs[i]);
 440    free(configs);
 441 }
 442
 443 _X_HIDDEN __GLXDRIdrawable *
 444 driFetchDrawable(struct glx_context *gc, GLXDrawable glxDrawable)
 445 {
 446    struct glx_display *const priv = __glXInitialize(gc->psc->dpy);
 447    __GLXDRIdrawable *pdraw;
 448    struct glx_screen *psc;
 449
 450    if (priv == NULL)
 451       return NULL;
 452
 453    if (glxDrawable == None)
 454       return NULL;
 455
 456    psc = priv->screens[gc->screen];
 457    if (priv->drawHash == NULL)
 458       return NULL;
 459
 460    if (__glxHashLookup(priv->drawHash, glxDrawable, (void *) &pdraw) == 0) {
 461       pdraw->refcount ++;
 462       return pdraw;
 463    }
 464
 465    pdraw = psc->driScreen->createDrawable(psc, glxDrawable,
 466                                           glxDrawable, gc->config);
 467
 468    if (pdraw == NULL) {
 469       ErrorMessageF("failed to create drawable\n");
 470       return NULL;
 471    }
 472
 473    if (__glxHashInsert(priv->drawHash, glxDrawable, pdraw)) {
 474       (*pdraw->destroyDrawable) (pdraw);
 475       return NULL;
 476    }
 477    pdraw->refcount = 1;
 478
 479    return pdraw;
 480 }
 481
 482 _X_HIDDEN void
 483 driReleaseDrawables(struct glx_context *gc)
 484 {
 485    const struct glx_display *priv = gc->psc->display;
 486    __GLXDRIdrawable *pdraw;
 487
 488    if (priv == NULL)
 489       return;
 490
 491    if (__glxHashLookup(priv->drawHash,
 492                        gc->currentDrawable, (void *) &pdraw) == 0) {
 493       if (pdraw->drawable == pdraw->xDrawable) {
 494          pdraw->refcount --;
 495          if (pdraw->refcount == 0) {
 496             (*pdraw->destroyDrawable)(pdraw);
 497             __glxHashDelete(priv->drawHash, gc->currentDrawable);
 498          }
 499       }
 500    }
 501
 502    if (__glxHashLookup(priv->drawHash,
 503                        gc->currentReadable, (void *) &pdraw) == 0) {
 504       if (pdraw->drawable == pdraw->xDrawable) {
 505          pdraw->refcount --;
 506          if (pdraw->refcount == 0) {
 507             (*pdraw->destroyDrawable)(pdraw);
 508             __glxHashDelete(priv->drawHash, gc->currentReadable);
 509          }
 510       }
 511    }
 512
 513    gc->currentDrawable = None;
 514    gc->currentReadable = None;
 515
 516 }
 517
 518 _X_HIDDEN bool
 519 dri2_convert_glx_attribs(unsigned num_attribs, const uint32_t *attribs,
 520                          unsigned *major_ver, unsigned *minor_ver,
 521                          uint32_t *render_type, uint32_t *flags, unsigned *api,
 522                          int *reset, unsigned *error)
 523 {
 524    unsigned i;
 525    bool got_profile = false;
 526    uint32_t profile;
 527
 528    *major_ver = 1;
 529    *minor_ver = 0;
 530    *render_type = GLX_RGBA_TYPE;
 531    *reset = __DRI_CTX_RESET_NO_NOTIFICATION;
 532    *flags = 0;
 533    *api = __DRI_API_OPENGL;
 534
 535    if (num_attribs == 0) {
 536       return true;
 537    }
 538
 539    /* This is actually an internal error, but what the heck.
 540     */
 541    if (attribs == NULL) {
 542       *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 543       return false;
 544    }
 545
 546    for (i = 0; i < num_attribs; i++) {
 547       switch (attribs[i * 2]) {
 548       case GLX_CONTEXT_MAJOR_VERSION_ARB:
 549          *major_ver = attribs[i * 2 + 1];
 550          break;
 551       case GLX_CONTEXT_MINOR_VERSION_ARB:
 552          *minor_ver = attribs[i * 2 + 1];
 553          break;
 554       case GLX_CONTEXT_FLAGS_ARB:
 555          *flags = attribs[i * 2 + 1];
 556          break;
 557       case GLX_CONTEXT_PROFILE_MASK_ARB:
 558          profile = attribs[i * 2 + 1];
 559          got_profile = true;
 560          break;
 561       case GLX_RENDER_TYPE:
 562          *render_type = attribs[i * 2 + 1];
 563          break;
 564       case GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB:
 565          switch (attribs[i * 2 + 1]) {
 566          case GLX_NO_RESET_NOTIFICATION_ARB:
 567             *reset = __DRI_CTX_RESET_NO_NOTIFICATION;
 568             break;
 569          case GLX_LOSE_CONTEXT_ON_RESET_ARB:
 570             *reset = __DRI_CTX_RESET_LOSE_CONTEXT;
 571             break;
 572          default:
 573             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 574             return false;
 575          }
 576          break;
 577       default:
 578          /* If an unknown attribute is received, fail.
 579           */
 580          *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 581          return false;
 582       }
 583    }
 584
 585    if (!got_profile) {
 586       if (*major_ver > 3 || (*major_ver == 3 && *minor_ver >= 2))
 587          *api = __DRI_API_OPENGL_CORE;
 588    } else {
 589       switch (profile) {
 590       case GLX_CONTEXT_CORE_PROFILE_BIT_ARB:
 591          /* There are no profiles before OpenGL 3.2.  The
 592           * GLX_ARB_create_context_profile spec says:
 593           *
 594           *     "If the requested OpenGL version is less than 3.2,
 595           *     GLX_CONTEXT_PROFILE_MASK_ARB is ignored and the functionality
 596           *     of the context is determined solely by the requested version."
 597           */
 598          *api = (*major_ver > 3 || (*major_ver == 3 && *minor_ver >= 2))
 599             ? __DRI_API_OPENGL_CORE : __DRI_API_OPENGL;
 600          break;
 601       case GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB:
 602          *api = __DRI_API_OPENGL;
 603          break;
 604       case GLX_CONTEXT_ES2_PROFILE_BIT_EXT:
 605          *api = __DRI_API_GLES2;
 606          break;
 607       default:
 608          *error = __DRI_CTX_ERROR_BAD_API;
 609          return false;
 610       }
 611    }
 612
 613    /* Unknown flag value.
 614     */
 615    if (*flags & ~(__DRI_CTX_FLAG_DEBUG | __DRI_CTX_FLAG_FORWARD_COMPATIBLE
 616                   | __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS)) {
 617       *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
 618       return false;
 619    }
 620
 621    /* There are no forward-compatible contexts before OpenGL 3.0.  The
 622     * GLX_ARB_create_context spec says:
 623     *
 624     *     "Forward-compatible contexts are defined only for OpenGL versions
 625     *     3.0 and later."
 626     */
 627    if (*major_ver < 3 && (*flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
 628       *error = __DRI_CTX_ERROR_BAD_FLAG;
 629       return false;
 630    }
 631
 632    if (*major_ver >= 3 && *render_type == GLX_COLOR_INDEX_TYPE) {
 633       *error = __DRI_CTX_ERROR_BAD_FLAG;
 634       return false;
 635    }
 636
 637    /* The GLX_EXT_create_context_es2_profile spec says:
 638     *
 639     *     "... If the version requested is 2.0, and the
 640     *     GLX_CONTEXT_ES2_PROFILE_BIT_EXT bit is set in the
 641     *     GLX_CONTEXT_PROFILE_MASK_ARB attribute (see below), then the context
 642     *     returned will implement OpenGL ES 2.0. This is the only way in which
 643     *     an implementation may request an OpenGL ES 2.0 context."
 644     */
 645    if (*api == __DRI_API_GLES2 && (*major_ver != 2 || *minor_ver != 0)) {
 646       *error = __DRI_CTX_ERROR_BAD_API;
 647       return false;
 648    }
 649
 650    *error = __DRI_CTX_ERROR_SUCCESS;
 651    return true;
 652 }
 653
 654 #endif /* GLX_DIRECT_RENDERING */