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 GL_LIB_NAME
  77 #define GL_LIB_NAME "libGL.so.1"
  78 #endif
  79
  80 /**
  81  * Try to \c dlopen the named driver.
  82  *
  83  * This function adds the "_dri.so" suffix to the driver name and searches the
  84  * directories specified by the \c LIBGL_DRIVERS_PATH environment variable in
  85  * order to find the driver.
  86  *
  87  * \param driverName - a name like "i965", "radeon", "nouveau", etc.
  88  * \param out_driver_handle - Address to return the resulting dlopen() handle.
  89  *
  90  * \returns
  91  * The __DRIextension entrypoint table for the driver, or \c NULL if driver
  92  * file not found.
  93  */
  94 _X_HIDDEN const __DRIextension **
  95 driOpenDriver(const char *driverName, void **out_driver_handle)
  96 {
  97    void *glhandle;
  98
  99    /* Attempt to make sure libGL symbols will be visible to the driver */
 100    glhandle = dlopen(GL_LIB_NAME, RTLD_NOW | RTLD_GLOBAL);
 101
 102    static const char *search_path_vars[] = {
 103       "LIBGL_DRIVERS_PATH",
 104       "LIBGL_DRIVERS_DIR", /* deprecated */
 105       NULL
 106    };
 107
 108    const __DRIextension **extensions =
 109       loader_open_driver(driverName, out_driver_handle, search_path_vars);
 110
 111    if (glhandle)
 112       dlclose(glhandle);
 113
 114    return extensions;
 115 }
 116
 117 static GLboolean
 118 __driGetMSCRate(__DRIdrawable *draw,
 119                 int32_t * numerator, int32_t * denominator,
 120                 void *loaderPrivate)
 121 {
 122    __GLXDRIdrawable *glxDraw = loaderPrivate;
 123
 124    return __glxGetMscRate(glxDraw->psc, numerator, denominator);
 125 }
 126
 127 _X_HIDDEN const __DRIsystemTimeExtension systemTimeExtension = {
 128    .base = {__DRI_SYSTEM_TIME, 1 },
 129
 130    .getUST              = __glXGetUST,
 131    .getMSCRate          = __driGetMSCRate
 132 };
 133
 134 #define __ATTRIB(attrib, field) \
 135     { attrib, offsetof(struct glx_config, field) }
 136
 137 static const struct
 138 {
 139    unsigned int attrib, offset;
 140 } attribMap[] = {
 141    __ATTRIB(__DRI_ATTRIB_BUFFER_SIZE, rgbBits),
 142       __ATTRIB(__DRI_ATTRIB_LEVEL, level),
 143       __ATTRIB(__DRI_ATTRIB_RED_SIZE, redBits),
 144       __ATTRIB(__DRI_ATTRIB_GREEN_SIZE, greenBits),
 145       __ATTRIB(__DRI_ATTRIB_BLUE_SIZE, blueBits),
 146       __ATTRIB(__DRI_ATTRIB_ALPHA_SIZE, alphaBits),
 147       __ATTRIB(__DRI_ATTRIB_DEPTH_SIZE, depthBits),
 148       __ATTRIB(__DRI_ATTRIB_STENCIL_SIZE, stencilBits),
 149       __ATTRIB(__DRI_ATTRIB_ACCUM_RED_SIZE, accumRedBits),
 150       __ATTRIB(__DRI_ATTRIB_ACCUM_GREEN_SIZE, accumGreenBits),
 151       __ATTRIB(__DRI_ATTRIB_ACCUM_BLUE_SIZE, accumBlueBits),
 152       __ATTRIB(__DRI_ATTRIB_ACCUM_ALPHA_SIZE, accumAlphaBits),
 153       __ATTRIB(__DRI_ATTRIB_SAMPLE_BUFFERS, sampleBuffers),
 154       __ATTRIB(__DRI_ATTRIB_SAMPLES, samples),
 155       __ATTRIB(__DRI_ATTRIB_DOUBLE_BUFFER, doubleBufferMode),
 156       __ATTRIB(__DRI_ATTRIB_STEREO, stereoMode),
 157       __ATTRIB(__DRI_ATTRIB_AUX_BUFFERS, numAuxBuffers),
 158 #if 0
 159       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_TYPE, transparentPixel),
 160       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_INDEX_VALUE, transparentIndex),
 161       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_RED_VALUE, transparentRed),
 162       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_GREEN_VALUE, transparentGreen),
 163       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_BLUE_VALUE, transparentBlue),
 164       __ATTRIB(__DRI_ATTRIB_TRANSPARENT_ALPHA_VALUE, transparentAlpha),
 165       __ATTRIB(__DRI_ATTRIB_RED_MASK, redMask),
 166       __ATTRIB(__DRI_ATTRIB_GREEN_MASK, greenMask),
 167       __ATTRIB(__DRI_ATTRIB_BLUE_MASK, blueMask),
 168       __ATTRIB(__DRI_ATTRIB_ALPHA_MASK, alphaMask),
 169 #endif
 170       __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_WIDTH, maxPbufferWidth),
 171       __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_HEIGHT, maxPbufferHeight),
 172       __ATTRIB(__DRI_ATTRIB_MAX_PBUFFER_PIXELS, maxPbufferPixels),
 173       __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_WIDTH, optimalPbufferWidth),
 174       __ATTRIB(__DRI_ATTRIB_OPTIMAL_PBUFFER_HEIGHT, optimalPbufferHeight),
 175       __ATTRIB(__DRI_ATTRIB_SWAP_METHOD, swapMethod),
 176       __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGB, bindToTextureRgb),
 177       __ATTRIB(__DRI_ATTRIB_BIND_TO_TEXTURE_RGBA, bindToTextureRgba),
 178       __ATTRIB(__DRI_ATTRIB_BIND_TO_MIPMAP_TEXTURE,
 179                      bindToMipmapTexture),
 180       __ATTRIB(__DRI_ATTRIB_YINVERTED, yInverted),
 181       __ATTRIB(__DRI_ATTRIB_FRAMEBUFFER_SRGB_CAPABLE, sRGBCapable)
 182 };
 183
 184 static int
 185 scalarEqual(struct glx_config *mode, unsigned int attrib, unsigned int value)
 186 {
 187    unsigned glxValue, i;
 188
 189    for (i = 0; i < ARRAY_SIZE(attribMap); i++)
 190       if (attribMap[i].attrib == attrib) {
 191          glxValue = *(unsigned int *) ((char *) mode + attribMap[i].offset);
 192          return glxValue == GLX_DONT_CARE || glxValue == value;
 193       }
 194
 195    return GL_TRUE;              /* Is a non-existing attribute equal to value? */
 196 }
 197
 198 static int
 199 driConfigEqual(const __DRIcoreExtension *core,
 200                struct glx_config *config, const __DRIconfig *driConfig)
 201 {
 202    unsigned int attrib, value, glxValue;
 203    int i;
 204
 205    i = 0;
 206    while (core->indexConfigAttrib(driConfig, i++, &attrib, &value)) {
 207       switch (attrib) {
 208       case __DRI_ATTRIB_RENDER_TYPE:
 209          glxValue = 0;
 210          if (value & __DRI_ATTRIB_RGBA_BIT) {
 211             glxValue |= GLX_RGBA_BIT;
 212          }
 213          if (value & __DRI_ATTRIB_COLOR_INDEX_BIT) {
 214             glxValue |= GLX_COLOR_INDEX_BIT;
 215          }
 216          if (value & __DRI_ATTRIB_FLOAT_BIT) {
 217             glxValue |= GLX_RGBA_FLOAT_BIT_ARB;
 218          }
 219          if (value & __DRI_ATTRIB_UNSIGNED_FLOAT_BIT) {
 220             glxValue |= GLX_RGBA_UNSIGNED_FLOAT_BIT_EXT;
 221          }
 222          if (glxValue != config->renderType)
 223             return GL_FALSE;
 224          break;
 225
 226       case __DRI_ATTRIB_CONFIG_CAVEAT:
 227          if (value & __DRI_ATTRIB_NON_CONFORMANT_CONFIG)
 228             glxValue = GLX_NON_CONFORMANT_CONFIG;
 229          else if (value & __DRI_ATTRIB_SLOW_BIT)
 230             glxValue = GLX_SLOW_CONFIG;
 231          else
 232             glxValue = GLX_NONE;
 233          if (glxValue != config->visualRating)
 234             return GL_FALSE;
 235          break;
 236
 237       case __DRI_ATTRIB_BIND_TO_TEXTURE_TARGETS:
 238          glxValue = 0;
 239          if (value & __DRI_ATTRIB_TEXTURE_1D_BIT)
 240             glxValue |= GLX_TEXTURE_1D_BIT_EXT;
 241          if (value & __DRI_ATTRIB_TEXTURE_2D_BIT)
 242             glxValue |= GLX_TEXTURE_2D_BIT_EXT;
 243          if (value & __DRI_ATTRIB_TEXTURE_RECTANGLE_BIT)
 244             glxValue |= GLX_TEXTURE_RECTANGLE_BIT_EXT;
 245          if (config->bindToTextureTargets != GLX_DONT_CARE &&
 246              glxValue != config->bindToTextureTargets)
 247             return GL_FALSE;
 248          break;
 249
 250       case __DRI_ATTRIB_SWAP_METHOD:
 251          if (value == __DRI_ATTRIB_SWAP_EXCHANGE)
 252             glxValue = GLX_SWAP_EXCHANGE_OML;
 253          else if (value == __DRI_ATTRIB_SWAP_COPY)
 254             glxValue = GLX_SWAP_COPY_OML;
 255          else
 256             glxValue = GLX_SWAP_UNDEFINED_OML;
 257
 258          if (!scalarEqual(config, attrib, glxValue))
 259             return GL_FALSE;
 260
 261          break;
 262
 263       default:
 264          if (!scalarEqual(config, attrib, value))
 265             return GL_FALSE;
 266       }
 267    }
 268
 269    return GL_TRUE;
 270 }
 271
 272 static struct glx_config *
 273 createDriMode(const __DRIcoreExtension * core,
 274               struct glx_config *config, const __DRIconfig **driConfigs)
 275 {
 276    __GLXDRIconfigPrivate *driConfig;
 277    int i;
 278
 279    for (i = 0; driConfigs[i]; i++) {
 280       if (driConfigEqual(core, config, driConfigs[i]))
 281          break;
 282    }
 283
 284    if (driConfigs[i] == NULL)
 285       return NULL;
 286
 287    driConfig = malloc(sizeof *driConfig);
 288    if (driConfig == NULL)
 289       return NULL;
 290
 291    driConfig->base = *config;
 292    driConfig->driConfig = driConfigs[i];
 293
 294    return &driConfig->base;
 295 }
 296
 297 _X_HIDDEN struct glx_config *
 298 driConvertConfigs(const __DRIcoreExtension * core,
 299                   struct glx_config *configs, const __DRIconfig **driConfigs)
 300 {
 301    struct glx_config head, *tail, *m;
 302
 303    tail = &head;
 304    head.next = NULL;
 305    for (m = configs; m; m = m->next) {
 306       tail->next = createDriMode(core, m, driConfigs);
 307       if (tail->next == NULL) {
 308          /* no matching dri config for m */
 309          continue;
 310       }
 311
 312
 313       tail = tail->next;
 314    }
 315
 316    return head.next;
 317 }
 318
 319 _X_HIDDEN void
 320 driDestroyConfigs(const __DRIconfig **configs)
 321 {
 322    int i;
 323
 324    for (i = 0; configs[i]; i++)
 325       free((__DRIconfig *) configs[i]);
 326    free(configs);
 327 }
 328
 329 static struct glx_config *
 330 driInferDrawableConfig(struct glx_screen *psc, GLXDrawable draw)
 331 {
 332    unsigned int fbconfig = 0;
 333
 334    if (__glXGetDrawableAttribute(psc->dpy, draw, GLX_FBCONFIG_ID, &fbconfig)) {
 335       return glx_config_find_fbconfig(psc->configs, fbconfig);
 336    }
 337
 338    return NULL;
 339 }
 340
 341 _X_HIDDEN __GLXDRIdrawable *
 342 driFetchDrawable(struct glx_context *gc, GLXDrawable glxDrawable)
 343 {
 344    struct glx_display *const priv = __glXInitialize(gc->psc->dpy);
 345    __GLXDRIdrawable *pdraw;
 346    struct glx_screen *psc;
 347    struct glx_config *config = gc->config;
 348
 349    if (priv == NULL)
 350       return NULL;
 351
 352    if (glxDrawable == None)
 353       return NULL;
 354
 355    psc = priv->screens[gc->screen];
 356    if (priv->drawHash == NULL)
 357       return NULL;
 358
 359    if (__glxHashLookup(priv->drawHash, glxDrawable, (void *) &pdraw) == 0) {
 360       pdraw->refcount ++;
 361       return pdraw;
 362    }
 363
 364    if (config == NULL)
 365       config = driInferDrawableConfig(gc->psc, glxDrawable);
 366    if (config == NULL)
 367       return NULL;
 368
 369    pdraw = psc->driScreen->createDrawable(psc, glxDrawable, glxDrawable,
 370                                           config);
 371
 372    if (pdraw == NULL) {
 373       ErrorMessageF("failed to create drawable\n");
 374       return NULL;
 375    }
 376
 377    if (__glxHashInsert(priv->drawHash, glxDrawable, pdraw)) {
 378       (*pdraw->destroyDrawable) (pdraw);
 379       return NULL;
 380    }
 381    pdraw->refcount = 1;
 382
 383    return pdraw;
 384 }
 385
 386 _X_HIDDEN void
 387 driReleaseDrawables(struct glx_context *gc)
 388 {
 389    const struct glx_display *priv = gc->psc->display;
 390    __GLXDRIdrawable *pdraw;
 391
 392    if (priv == NULL)
 393       return;
 394
 395    if (__glxHashLookup(priv->drawHash,
 396                        gc->currentDrawable, (void *) &pdraw) == 0) {
 397       if (pdraw->drawable == pdraw->xDrawable) {
 398          pdraw->refcount --;
 399          if (pdraw->refcount == 0) {
 400             (*pdraw->destroyDrawable)(pdraw);
 401             __glxHashDelete(priv->drawHash, gc->currentDrawable);
 402          }
 403       }
 404    }
 405
 406    if (__glxHashLookup(priv->drawHash,
 407                        gc->currentReadable, (void *) &pdraw) == 0) {
 408       if (pdraw->drawable == pdraw->xDrawable) {
 409          pdraw->refcount --;
 410          if (pdraw->refcount == 0) {
 411             (*pdraw->destroyDrawable)(pdraw);
 412             __glxHashDelete(priv->drawHash, gc->currentReadable);
 413          }
 414       }
 415    }
 416
 417    gc->currentDrawable = None;
 418    gc->currentReadable = None;
 419
 420 }
 421
 422 _X_HIDDEN bool
 423 dri2_convert_glx_attribs(unsigned num_attribs, const uint32_t *attribs,
 424                          unsigned *major_ver, unsigned *minor_ver,
 425                          uint32_t *render_type, uint32_t *flags, unsigned *api,
 426                          int *reset, int *release, unsigned *error)
 427 {
 428    unsigned i;
 429    bool got_profile = false;
 430    int no_error = 0;
 431    uint32_t profile;
 432
 433    *major_ver = 1;
 434    *minor_ver = 0;
 435    *render_type = GLX_RGBA_TYPE;
 436    *reset = __DRI_CTX_RESET_NO_NOTIFICATION;
 437    *release = __DRI_CTX_RELEASE_BEHAVIOR_FLUSH;
 438    *flags = 0;
 439    *api = __DRI_API_OPENGL;
 440
 441    if (num_attribs == 0) {
 442       return true;
 443    }
 444
 445    /* This is actually an internal error, but what the heck.
 446     */
 447    if (attribs == NULL) {
 448       *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 449       return false;
 450    }
 451
 452    for (i = 0; i < num_attribs; i++) {
 453       switch (attribs[i * 2]) {
 454       case GLX_CONTEXT_MAJOR_VERSION_ARB:
 455          *major_ver = attribs[i * 2 + 1];
 456          break;
 457       case GLX_CONTEXT_MINOR_VERSION_ARB:
 458          *minor_ver = attribs[i * 2 + 1];
 459          break;
 460       case GLX_CONTEXT_FLAGS_ARB:
 461          *flags = attribs[i * 2 + 1];
 462          break;
 463       case GLX_CONTEXT_OPENGL_NO_ERROR_ARB:
 464          no_error = attribs[i * 2 + 1];
 465          break;
 466       case GLX_CONTEXT_PROFILE_MASK_ARB:
 467          profile = attribs[i * 2 + 1];
 468          got_profile = true;
 469          break;
 470       case GLX_RENDER_TYPE:
 471          *render_type = attribs[i * 2 + 1];
 472          break;
 473       case GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB:
 474          switch (attribs[i * 2 + 1]) {
 475          case GLX_NO_RESET_NOTIFICATION_ARB:
 476             *reset = __DRI_CTX_RESET_NO_NOTIFICATION;
 477             break;
 478          case GLX_LOSE_CONTEXT_ON_RESET_ARB:
 479             *reset = __DRI_CTX_RESET_LOSE_CONTEXT;
 480             break;
 481          default:
 482             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 483             return false;
 484          }
 485          break;
 486       case GLX_CONTEXT_RELEASE_BEHAVIOR_ARB:
 487          switch (attribs[i * 2 + 1]) {
 488          case GLX_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB:
 489             *release = __DRI_CTX_RELEASE_BEHAVIOR_NONE;
 490             break;
 491          case GLX_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB:
 492             *release = __DRI_CTX_RELEASE_BEHAVIOR_FLUSH;
 493             break;
 494          default:
 495             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 496             return false;
 497          }
 498          break;
 499       default:
 500          /* If an unknown attribute is received, fail.
 501           */
 502          *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 503          return false;
 504       }
 505    }
 506
 507    if (no_error) {
 508       *flags |= __DRI_CTX_FLAG_NO_ERROR;
 509    }
 510
 511    if (!got_profile) {
 512       if (*major_ver > 3 || (*major_ver == 3 && *minor_ver >= 2))
 513          *api = __DRI_API_OPENGL_CORE;
 514    } else {
 515       switch (profile) {
 516       case GLX_CONTEXT_CORE_PROFILE_BIT_ARB:
 517          /* There are no profiles before OpenGL 3.2.  The
 518           * GLX_ARB_create_context_profile spec says:
 519           *
 520           *     "If the requested OpenGL version is less than 3.2,
 521           *     GLX_CONTEXT_PROFILE_MASK_ARB is ignored and the functionality
 522           *     of the context is determined solely by the requested version."
 523           */
 524          *api = (*major_ver > 3 || (*major_ver == 3 && *minor_ver >= 2))
 525             ? __DRI_API_OPENGL_CORE : __DRI_API_OPENGL;
 526          break;
 527       case GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB:
 528          *api = __DRI_API_OPENGL;
 529          break;
 530       case GLX_CONTEXT_ES_PROFILE_BIT_EXT:
 531          if (*major_ver >= 3)
 532             *api = __DRI_API_GLES3;
 533          else if (*major_ver == 2 && *minor_ver == 0)
 534             *api = __DRI_API_GLES2;
 535          else if (*major_ver == 1 && *minor_ver < 2)
 536             *api = __DRI_API_GLES;
 537          else {
 538             *error = __DRI_CTX_ERROR_BAD_API;
 539             return false;
 540          }
 541          break;
 542       default:
 543          *error = __DRI_CTX_ERROR_BAD_API;
 544          return false;
 545       }
 546    }
 547
 548    /* Unknown flag value.
 549     */
 550    if (*flags & ~(__DRI_CTX_FLAG_DEBUG | __DRI_CTX_FLAG_FORWARD_COMPATIBLE
 551                   | __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS
 552                   | __DRI_CTX_FLAG_NO_ERROR)) {
 553       *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
 554       return false;
 555    }
 556
 557    /* There are no forward-compatible contexts before OpenGL 3.0.  The
 558     * GLX_ARB_create_context spec says:
 559     *
 560     *     "Forward-compatible contexts are defined only for OpenGL versions
 561     *     3.0 and later."
 562     */
 563    if (*major_ver < 3 && (*flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
 564       *error = __DRI_CTX_ERROR_BAD_FLAG;
 565       return false;
 566    }
 567
 568    if (*major_ver >= 3 && *render_type == GLX_COLOR_INDEX_TYPE) {
 569       *error = __DRI_CTX_ERROR_BAD_FLAG;
 570       return false;
 571    }
 572
 573    *error = __DRI_CTX_ERROR_SUCCESS;
 574    return true;
 575 }
 576
 577 _X_HIDDEN bool
 578 dri2_check_no_error(uint32_t flags, struct glx_context *share_context,
 579                     int major, unsigned *error)
 580 {
 581    Bool noError = flags & __DRI_CTX_FLAG_NO_ERROR;
 582
 583    /* The KHR_no_error specs say:
 584     *
 585     *    Requires OpenGL ES 2.0 or OpenGL 2.0.
 586     */
 587    if (noError && major < 2) {
 588       *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 589       return false;
 590    }
 591
 592    /* The GLX_ARB_create_context_no_error specs say:
 593     *
 594     *    BadMatch is generated if the value of GLX_CONTEXT_OPENGL_NO_ERROR_ARB
 595     *    used to create <share_context> does not match the value of
 596     *    GLX_CONTEXT_OPENGL_NO_ERROR_ARB for the context being created.
 597     */
 598    if (share_context && !!share_context->noError != !!noError) {
 599       *error = __DRI_CTX_ERROR_BAD_FLAG;
 600       return false;
 601    }
 602
 603    /* The GLX_ARB_create_context_no_error specs say:
 604     *
 605     *    BadMatch is generated if the GLX_CONTEXT_OPENGL_NO_ERROR_ARB is TRUE at
 606     *    the same time as a debug or robustness context is specified.
 607     *
 608     */
 609    if (noError && ((flags & __DRI_CTX_FLAG_DEBUG) ||
 610                    (flags & __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS))) {
 611       *error = __DRI_CTX_ERROR_BAD_FLAG;
 612       return false;
 613    }
 614
 615    return true;
 616 }
 617
 618 #endif /* GLX_DIRECT_RENDERING */