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 driConfigEqual(const __DRIcoreExtension *core,
 270                struct glx_config *config, const __DRIconfig *driConfig)
 271 {
 272    unsigned int attrib, value, glxValue;
 273    int i;
 274
 275    i = 0;
 276    while (core->indexConfigAttrib(driConfig, i++, &attrib, &value)) {
 277       switch (attrib) {
 278       case __DRI_ATTRIB_RENDER_TYPE:
 279          glxValue = 0;
 280          if (value & __DRI_ATTRIB_RGBA_BIT) {
 281             glxValue |= GLX_RGBA_BIT;
 282          }
 283          if (value & __DRI_ATTRIB_COLOR_INDEX_BIT) {
 284             glxValue |= GLX_COLOR_INDEX_BIT;
 285          }
 286          if (value & __DRI_ATTRIB_FLOAT_BIT) {
 287             glxValue |= GLX_RGBA_FLOAT_BIT_ARB;
 288          }
 289          if (value & __DRI_ATTRIB_UNSIGNED_FLOAT_BIT) {
 290             glxValue |= GLX_RGBA_UNSIGNED_FLOAT_BIT_EXT;
 291          }
 292          if (glxValue != config->renderType)
 293             return GL_FALSE;
 294          break;
 295
 296       case __DRI_ATTRIB_CONFIG_CAVEAT:
 297          if (value & __DRI_ATTRIB_NON_CONFORMANT_CONFIG)
 298             glxValue = GLX_NON_CONFORMANT_CONFIG;
 299          else if (value & __DRI_ATTRIB_SLOW_BIT)
 300             glxValue = GLX_SLOW_CONFIG;
 301          else
 302             glxValue = GLX_NONE;
 303          if (glxValue != config->visualRating)
 304             return GL_FALSE;
 305          break;
 306
 307       case __DRI_ATTRIB_BIND_TO_TEXTURE_TARGETS:
 308          glxValue = 0;
 309          if (value & __DRI_ATTRIB_TEXTURE_1D_BIT)
 310             glxValue |= GLX_TEXTURE_1D_BIT_EXT;
 311          if (value & __DRI_ATTRIB_TEXTURE_2D_BIT)
 312             glxValue |= GLX_TEXTURE_2D_BIT_EXT;
 313          if (value & __DRI_ATTRIB_TEXTURE_RECTANGLE_BIT)
 314             glxValue |= GLX_TEXTURE_RECTANGLE_BIT_EXT;
 315          if (config->bindToTextureTargets != GLX_DONT_CARE &&
 316              glxValue != config->bindToTextureTargets)
 317             return GL_FALSE;
 318          break;
 319
 320       default:
 321          if (!scalarEqual(config, attrib, value))
 322             return GL_FALSE;
 323       }
 324    }
 325
 326    return GL_TRUE;
 327 }
 328
 329 static struct glx_config *
 330 createDriMode(const __DRIcoreExtension * core,
 331               struct glx_config *config, const __DRIconfig **driConfigs)
 332 {
 333    __GLXDRIconfigPrivate *driConfig;
 334    int i;
 335
 336    for (i = 0; driConfigs[i]; i++) {
 337       if (driConfigEqual(core, config, driConfigs[i]))
 338          break;
 339    }
 340
 341    if (driConfigs[i] == NULL)
 342       return NULL;
 343
 344    driConfig = malloc(sizeof *driConfig);
 345    if (driConfig == NULL)
 346       return NULL;
 347
 348    driConfig->base = *config;
 349    driConfig->driConfig = driConfigs[i];
 350
 351    return &driConfig->base;
 352 }
 353
 354 _X_HIDDEN struct glx_config *
 355 driConvertConfigs(const __DRIcoreExtension * core,
 356                   struct glx_config *configs, const __DRIconfig **driConfigs)
 357 {
 358    struct glx_config head, *tail, *m;
 359
 360    tail = &head;
 361    head.next = NULL;
 362    for (m = configs; m; m = m->next) {
 363       tail->next = createDriMode(core, m, driConfigs);
 364       if (tail->next == NULL) {
 365          /* no matching dri config for m */
 366          continue;
 367       }
 368
 369
 370       tail = tail->next;
 371    }
 372
 373    return head.next;
 374 }
 375
 376 _X_HIDDEN void
 377 driDestroyConfigs(const __DRIconfig **configs)
 378 {
 379    int i;
 380
 381    for (i = 0; configs[i]; i++)
 382       free((__DRIconfig *) configs[i]);
 383    free(configs);
 384 }
 385
 386 _X_HIDDEN __GLXDRIdrawable *
 387 driFetchDrawable(struct glx_context *gc, GLXDrawable glxDrawable)
 388 {
 389    struct glx_display *const priv = __glXInitialize(gc->psc->dpy);
 390    __GLXDRIdrawable *pdraw;
 391    struct glx_screen *psc;
 392
 393    if (priv == NULL)
 394       return NULL;
 395
 396    if (glxDrawable == None)
 397       return NULL;
 398
 399    psc = priv->screens[gc->screen];
 400    if (priv->drawHash == NULL)
 401       return NULL;
 402
 403    if (__glxHashLookup(priv->drawHash, glxDrawable, (void *) &pdraw) == 0) {
 404       pdraw->refcount ++;
 405       return pdraw;
 406    }
 407
 408    pdraw = psc->driScreen->createDrawable(psc, glxDrawable,
 409                                           glxDrawable, gc->config);
 410
 411    if (pdraw == NULL) {
 412       ErrorMessageF("failed to create drawable\n");
 413       return NULL;
 414    }
 415
 416    if (__glxHashInsert(priv->drawHash, glxDrawable, pdraw)) {
 417       (*pdraw->destroyDrawable) (pdraw);
 418       return NULL;
 419    }
 420    pdraw->refcount = 1;
 421
 422    return pdraw;
 423 }
 424
 425 _X_HIDDEN void
 426 driReleaseDrawables(struct glx_context *gc)
 427 {
 428    const struct glx_display *priv = gc->psc->display;
 429    __GLXDRIdrawable *pdraw;
 430
 431    if (priv == NULL)
 432       return;
 433
 434    if (__glxHashLookup(priv->drawHash,
 435                        gc->currentDrawable, (void *) &pdraw) == 0) {
 436       if (pdraw->drawable == pdraw->xDrawable) {
 437          pdraw->refcount --;
 438          if (pdraw->refcount == 0) {
 439             (*pdraw->destroyDrawable)(pdraw);
 440             __glxHashDelete(priv->drawHash, gc->currentDrawable);
 441          }
 442       }
 443    }
 444
 445    if (__glxHashLookup(priv->drawHash,
 446                        gc->currentReadable, (void *) &pdraw) == 0) {
 447       if (pdraw->drawable == pdraw->xDrawable) {
 448          pdraw->refcount --;
 449          if (pdraw->refcount == 0) {
 450             (*pdraw->destroyDrawable)(pdraw);
 451             __glxHashDelete(priv->drawHash, gc->currentReadable);
 452          }
 453       }
 454    }
 455
 456    gc->currentDrawable = None;
 457    gc->currentReadable = None;
 458
 459 }
 460
 461 _X_HIDDEN bool
 462 dri2_convert_glx_attribs(unsigned num_attribs, const uint32_t *attribs,
 463                          unsigned *major_ver, unsigned *minor_ver,
 464                          uint32_t *render_type, uint32_t *flags, unsigned *api,
 465                          int *reset, unsigned *error)
 466 {
 467    unsigned i;
 468    bool got_profile = false;
 469    uint32_t profile;
 470
 471    *major_ver = 1;
 472    *minor_ver = 0;
 473    *render_type = GLX_RGBA_TYPE;
 474    *reset = __DRI_CTX_RESET_NO_NOTIFICATION;
 475    *flags = 0;
 476    *api = __DRI_API_OPENGL;
 477
 478    if (num_attribs == 0) {
 479       return true;
 480    }
 481
 482    /* This is actually an internal error, but what the heck.
 483     */
 484    if (attribs == NULL) {
 485       *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 486       return false;
 487    }
 488
 489    for (i = 0; i < num_attribs; i++) {
 490       switch (attribs[i * 2]) {
 491       case GLX_CONTEXT_MAJOR_VERSION_ARB:
 492          *major_ver = attribs[i * 2 + 1];
 493          break;
 494       case GLX_CONTEXT_MINOR_VERSION_ARB:
 495          *minor_ver = attribs[i * 2 + 1];
 496          break;
 497       case GLX_CONTEXT_FLAGS_ARB:
 498          *flags = attribs[i * 2 + 1];
 499          break;
 500       case GLX_CONTEXT_PROFILE_MASK_ARB:
 501          profile = attribs[i * 2 + 1];
 502          got_profile = true;
 503          break;
 504       case GLX_RENDER_TYPE:
 505          *render_type = attribs[i * 2 + 1];
 506          break;
 507       case GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB:
 508          switch (attribs[i * 2 + 1]) {
 509          case GLX_NO_RESET_NOTIFICATION_ARB:
 510             *reset = __DRI_CTX_RESET_NO_NOTIFICATION;
 511             break;
 512          case GLX_LOSE_CONTEXT_ON_RESET_ARB:
 513             *reset = __DRI_CTX_RESET_LOSE_CONTEXT;
 514             break;
 515          default:
 516             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 517             return false;
 518          }
 519          break;
 520       default:
 521          /* If an unknown attribute is received, fail.
 522           */
 523          *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 524          return false;
 525       }
 526    }
 527
 528    if (!got_profile) {
 529       if (*major_ver > 3 || (*major_ver == 3 && *minor_ver >= 2))
 530          *api = __DRI_API_OPENGL_CORE;
 531    } else {
 532       switch (profile) {
 533       case GLX_CONTEXT_CORE_PROFILE_BIT_ARB:
 534          /* There are no profiles before OpenGL 3.2.  The
 535           * GLX_ARB_create_context_profile spec says:
 536           *
 537           *     "If the requested OpenGL version is less than 3.2,
 538           *     GLX_CONTEXT_PROFILE_MASK_ARB is ignored and the functionality
 539           *     of the context is determined solely by the requested version."
 540           */
 541          *api = (*major_ver > 3 || (*major_ver == 3 && *minor_ver >= 2))
 542             ? __DRI_API_OPENGL_CORE : __DRI_API_OPENGL;
 543          break;
 544       case GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB:
 545          *api = __DRI_API_OPENGL;
 546          break;
 547       case GLX_CONTEXT_ES2_PROFILE_BIT_EXT:
 548          *api = __DRI_API_GLES2;
 549          break;
 550       default:
 551          *error = __DRI_CTX_ERROR_BAD_API;
 552          return false;
 553       }
 554    }
 555
 556    /* Unknown flag value.
 557     */
 558    if (*flags & ~(__DRI_CTX_FLAG_DEBUG | __DRI_CTX_FLAG_FORWARD_COMPATIBLE
 559                   | __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS)) {
 560       *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
 561       return false;
 562    }
 563
 564    /* There are no forward-compatible contexts before OpenGL 3.0.  The
 565     * GLX_ARB_create_context spec says:
 566     *
 567     *     "Forward-compatible contexts are defined only for OpenGL versions
 568     *     3.0 and later."
 569     */
 570    if (*major_ver < 3 && (*flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
 571       *error = __DRI_CTX_ERROR_BAD_FLAG;
 572       return false;
 573    }
 574
 575    if (*major_ver >= 3 && *render_type == GLX_COLOR_INDEX_TYPE) {
 576       *error = __DRI_CTX_ERROR_BAD_FLAG;
 577       return false;
 578    }
 579
 580    /* The GLX_EXT_create_context_es2_profile spec says:
 581     *
 582     *     "... If the version requested is 2.0, and the
 583     *     GLX_CONTEXT_ES2_PROFILE_BIT_EXT bit is set in the
 584     *     GLX_CONTEXT_PROFILE_MASK_ARB attribute (see below), then the context
 585     *     returned will implement OpenGL ES 2.0. This is the only way in which
 586     *     an implementation may request an OpenGL ES 2.0 context."
 587     */
 588    if (*api == __DRI_API_GLES2 && (*major_ver != 2 || *minor_ver != 0)) {
 589       *error = __DRI_CTX_ERROR_BAD_API;
 590       return false;
 591    }
 592
 593    *error = __DRI_CTX_ERROR_SUCCESS;
 594    return true;
 595 }
 596
 597 #endif /* GLX_DIRECT_RENDERING */