src/glx/x11/dri2_glx.c

   1 /*
   2  * Copyright © 2008 Red Hat, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Soft-
   6  * ware"), to deal in the Software without restriction, including without
   7  * limitation the rights to use, copy, modify, merge, publish, distribute,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, provided that the above copyright
  10  * notice(s) and this permission notice appear in all copies of the Soft-
  11  * ware and that both the above copyright notice(s) and this permission
  12  * notice appear in supporting documentation.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
  16  * ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY
  17  * RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN
  18  * THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSE-
  19  * QUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  20  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  21  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFOR-
  22  * MANCE OF THIS SOFTWARE.
  23  *
  24  * Except as contained in this notice, the name of a copyright holder shall
  25  * not be used in advertising or otherwise to promote the sale, use or
  26  * other dealings in this Software without prior written authorization of
  27  * the copyright holder.
  28  *
  29  * Authors:
  30  *   Kristian Høgsberg (krh@redhat.com)
  31  */
  32
  33 #ifdef GLX_DIRECT_RENDERING
  34
  35 #include <X11/Xlib.h>
  36 #include <X11/extensions/Xfixes.h>
  37 #include <X11/extensions/Xdamage.h>
  38 #include "glapi.h"
  39 #include "glxclient.h"
  40 #include "glcontextmodes.h"
  41 #include "xf86dri.h"
  42 #include <dlfcn.h>
  43 #include <fcntl.h>
  44 #include <unistd.h>
  45 #include <sys/types.h>
  46 #include <sys/mman.h>
  47 #include "xf86drm.h"
  48 #include "dri2.h"
  49 #include "dri_common.h"
  50 #include "../../mesa/drivers/dri/common/dri_util.h"
  51
  52 #undef DRI2_MINOR
  53 #define DRI2_MINOR 1
  54
  55 typedef struct __GLXDRIdisplayPrivateRec __GLXDRIdisplayPrivate;
  56 typedef struct __GLXDRIcontextPrivateRec __GLXDRIcontextPrivate;
  57 typedef struct __GLXDRIdrawablePrivateRec __GLXDRIdrawablePrivate;
  58
  59 struct __GLXDRIdisplayPrivateRec
  60 {
  61    __GLXDRIdisplay base;
  62
  63    /*
  64     ** XFree86-DRI version information
  65     */
  66    int driMajor;
  67    int driMinor;
  68    int driPatch;
  69    int swapAvailable;
  70 };
  71
  72 struct __GLXDRIcontextPrivateRec
  73 {
  74    __GLXDRIcontext base;
  75    __DRIcontext *driContext;
  76    __GLXscreenConfigs *psc;
  77 };
  78
  79 struct __GLXDRIdrawablePrivateRec
  80 {
  81    __GLXDRIdrawable base;
  82    __DRIbuffer buffers[5];
  83    int bufferCount;
  84    int width, height;
  85    int have_back;
  86    int have_fake_front;
  87    int swap_interval;
  88 };
  89
  90 static void dri2WaitX(__GLXDRIdrawable * pdraw);
  91
  92 static void
  93 dri2DestroyContext(__GLXDRIcontext * context,
  94                    __GLXscreenConfigs * psc, Display * dpy)
  95 {
  96    __GLXDRIcontextPrivate *pcp = (__GLXDRIcontextPrivate *) context;
  97    const __DRIcoreExtension *core = pcp->psc->core;
  98
  99    (*core->destroyContext) (pcp->driContext);
 100
 101    Xfree(pcp);
 102 }
 103
 104 static Bool
 105 dri2BindContext(__GLXDRIcontext * context,
 106                 __GLXDRIdrawable * draw, __GLXDRIdrawable * read)
 107 {
 108    __GLXDRIcontextPrivate *pcp = (__GLXDRIcontextPrivate *) context;
 109    const __DRIcoreExtension *core = pcp->psc->core;
 110
 111    return (*core->bindContext) (pcp->driContext,
 112                                 draw->driDrawable, read->driDrawable);
 113 }
 114
 115 static void
 116 dri2UnbindContext(__GLXDRIcontext * context)
 117 {
 118    __GLXDRIcontextPrivate *pcp = (__GLXDRIcontextPrivate *) context;
 119    const __DRIcoreExtension *core = pcp->psc->core;
 120
 121    (*core->unbindContext) (pcp->driContext);
 122 }
 123
 124 static __GLXDRIcontext *
 125 dri2CreateContext(__GLXscreenConfigs * psc,
 126                   const __GLcontextModes * mode,
 127                   GLXContext gc, GLXContext shareList, int renderType)
 128 {
 129    __GLXDRIcontextPrivate *pcp, *pcp_shared;
 130    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) mode;
 131    __DRIcontext *shared = NULL;
 132
 133    if (shareList) {
 134       pcp_shared = (__GLXDRIcontextPrivate *) shareList->driContext;
 135       shared = pcp_shared->driContext;
 136    }
 137
 138    pcp = Xmalloc(sizeof *pcp);
 139    if (pcp == NULL)
 140       return NULL;
 141
 142    pcp->psc = psc;
 143    pcp->driContext =
 144       (*psc->dri2->createNewContext) (psc->__driScreen,
 145                                       config->driConfig, shared, pcp);
 146    gc->__driContext = pcp->driContext;
 147
 148    if (pcp->driContext == NULL) {
 149       Xfree(pcp);
 150       return NULL;
 151    }
 152
 153    pcp->base.destroyContext = dri2DestroyContext;
 154    pcp->base.bindContext = dri2BindContext;
 155    pcp->base.unbindContext = dri2UnbindContext;
 156
 157    return &pcp->base;
 158 }
 159
 160 static void
 161 dri2DestroyDrawable(__GLXDRIdrawable * pdraw)
 162 {
 163    const __DRIcoreExtension *core = pdraw->psc->core;
 164
 165    (*core->destroyDrawable) (pdraw->driDrawable);
 166    DRI2DestroyDrawable(pdraw->psc->dpy, pdraw->xDrawable);
 167    Xfree(pdraw);
 168 }
 169
 170 static __GLXDRIdrawable *
 171 dri2CreateDrawable(__GLXscreenConfigs * psc,
 172                    XID xDrawable,
 173                    GLXDrawable drawable, const __GLcontextModes * modes)
 174 {
 175    __GLXDRIdrawablePrivate *pdraw;
 176    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) modes;
 177
 178    pdraw = Xmalloc(sizeof(*pdraw));
 179    if (!pdraw)
 180       return NULL;
 181
 182    pdraw->base.destroyDrawable = dri2DestroyDrawable;
 183    pdraw->base.xDrawable = xDrawable;
 184    pdraw->base.drawable = drawable;
 185    pdraw->base.psc = psc;
 186    pdraw->bufferCount = 0;
 187
 188    DRI2CreateDrawable(psc->dpy, xDrawable);
 189
 190    /* Create a new drawable */
 191    pdraw->base.driDrawable =
 192       (*psc->dri2->createNewDrawable) (psc->__driScreen,
 193                                        config->driConfig, pdraw);
 194
 195    if (!pdraw->base.driDrawable) {
 196       DRI2DestroyDrawable(psc->dpy, xDrawable);
 197       Xfree(pdraw);
 198       return NULL;
 199    }
 200
 201    return &pdraw->base;
 202 }
 203
 204 static int
 205 dri2DrawableGetMSC(__GLXscreenConfigs *psc, __GLXDRIdrawable *pdraw,
 206                    int64_t *ust, int64_t *msc, int64_t *sbc)
 207 {
 208    return DRI2GetMSC(psc->dpy, pdraw->drawable, ust, msc, sbc);
 209 }
 210
 211 static int
 212 dri2WaitForMSC(__GLXDRIdrawable *pdraw, int64_t target_msc, int64_t divisor,
 213                int64_t remainder, int64_t *ust, int64_t *msc, int64_t *sbc)
 214 {
 215    return DRI2WaitMSC(pdraw->psc->dpy, pdraw->drawable, target_msc, divisor,
 216                       remainder, ust, msc, sbc);
 217 }
 218
 219 static int
 220 dri2WaitForSBC(__GLXDRIdrawable *pdraw, int64_t target_sbc, int64_t *ust,
 221                int64_t *msc, int64_t *sbc)
 222 {
 223    return DRI2WaitSBC(pdraw->psc->dpy, pdraw->drawable, target_sbc, ust, msc,
 224                       sbc);
 225 }
 226
 227 static void
 228 dri2CopySubBuffer(__GLXDRIdrawable *pdraw, int x, int y, int width, int height)
 229 {
 230    __GLXDRIdrawablePrivate *priv = (__GLXDRIdrawablePrivate *) pdraw;
 231    XRectangle xrect;
 232    XserverRegion region;
 233
 234    /* Check we have the right attachments */
 235    if (!priv->have_back)
 236       return;
 237
 238    xrect.x = x;
 239    xrect.y = priv->height - y - height;
 240    xrect.width = width;
 241    xrect.height = height;
 242
 243 #ifdef __DRI2_FLUSH
 244    if (pdraw->psc->f)
 245       (*pdraw->psc->f->flush) (pdraw->driDrawable);
 246 #endif
 247
 248    region = XFixesCreateRegion(pdraw->psc->dpy, &xrect, 1);
 249    /* should get a fence ID back from here at some point */
 250    DRI2CopyRegion(pdraw->psc->dpy, pdraw->xDrawable, region,
 251                   DRI2BufferFrontLeft, DRI2BufferBackLeft);
 252    XFixesDestroyRegion(pdraw->psc->dpy, region);
 253
 254    /* Refresh the fake front (if present) after we just damaged the real
 255     * front.
 256     */
 257    dri2WaitX(pdraw);
 258 }
 259
 260 static void
 261 dri2WaitX(__GLXDRIdrawable *pdraw)
 262 {
 263    __GLXDRIdrawablePrivate *priv = (__GLXDRIdrawablePrivate *) pdraw;
 264    XRectangle xrect;
 265    XserverRegion region;
 266
 267    /* Check we have the right attachments */
 268    if (!priv->have_fake_front)
 269       return;
 270
 271    xrect.x = 0;
 272    xrect.y = 0;
 273    xrect.width = priv->width;
 274    xrect.height = priv->height;
 275
 276 #ifdef __DRI2_FLUSH
 277    if (pdraw->psc->f)
 278       (*pdraw->psc->f->flush) (pdraw->driDrawable);
 279 #endif
 280
 281    region = XFixesCreateRegion(pdraw->psc->dpy, &xrect, 1);
 282    DRI2CopyRegion(pdraw->psc->dpy, pdraw->xDrawable, region,
 283                   DRI2BufferFakeFrontLeft, DRI2BufferFrontLeft);
 284    XFixesDestroyRegion(pdraw->psc->dpy, region);
 285 }
 286
 287 static void
 288 dri2WaitGL(__GLXDRIdrawable * pdraw)
 289 {
 290    __GLXDRIdrawablePrivate *priv = (__GLXDRIdrawablePrivate *) pdraw;
 291    XRectangle xrect;
 292    XserverRegion region;
 293
 294    if (!priv->have_fake_front)
 295       return;
 296
 297    xrect.x = 0;
 298    xrect.y = 0;
 299    xrect.width = priv->width;
 300    xrect.height = priv->height;
 301
 302 #ifdef __DRI2_FLUSH
 303    if (pdraw->psc->f)
 304       (*pdraw->psc->f->flush) (pdraw->driDrawable);
 305 #endif
 306
 307    region = XFixesCreateRegion(pdraw->psc->dpy, &xrect, 1);
 308    DRI2CopyRegion(pdraw->psc->dpy, pdraw->xDrawable, region,
 309                   DRI2BufferFrontLeft, DRI2BufferFakeFrontLeft);
 310    XFixesDestroyRegion(pdraw->psc->dpy, region);
 311 }
 312
 313
 314 static void
 315 dri2FlushFrontBuffer(__DRIdrawable * driDrawable, void *loaderPrivate)
 316 {
 317    (void) driDrawable;
 318    dri2WaitGL((__GLXDRIdrawable *) loaderPrivate);
 319 }
 320
 321
 322 static void
 323 dri2DestroyScreen(__GLXscreenConfigs * psc)
 324 {
 325    /* Free the direct rendering per screen data */
 326    (*psc->core->destroyScreen) (psc->__driScreen);
 327    close(psc->fd);
 328    psc->__driScreen = NULL;
 329 }
 330
 331 /**
 332  * Process list of buffer received from the server
 333  *
 334  * Processes the list of buffers received in a reply from the server to either
 335  * \c DRI2GetBuffers or \c DRI2GetBuffersWithFormat.
 336  */
 337 static void
 338 process_buffers(__GLXDRIdrawablePrivate * pdraw, DRI2Buffer * buffers,
 339                 unsigned count)
 340 {
 341    int i;
 342
 343    pdraw->bufferCount = count;
 344    pdraw->have_fake_front = 0;
 345    pdraw->have_back = 0;
 346
 347    /* This assumes the DRI2 buffer attachment tokens matches the
 348     * __DRIbuffer tokens. */
 349    for (i = 0; i < count; i++) {
 350       pdraw->buffers[i].attachment = buffers[i].attachment;
 351       pdraw->buffers[i].name = buffers[i].name;
 352       pdraw->buffers[i].pitch = buffers[i].pitch;
 353       pdraw->buffers[i].cpp = buffers[i].cpp;
 354       pdraw->buffers[i].flags = buffers[i].flags;
 355       if (pdraw->buffers[i].attachment == __DRI_BUFFER_FAKE_FRONT_LEFT)
 356          pdraw->have_fake_front = 1;
 357       if (pdraw->buffers[i].attachment == __DRI_BUFFER_BACK_LEFT)
 358          pdraw->have_back = 1;
 359    }
 360
 361 }
 362
 363 static int64_t
 364 dri2SwapBuffers(__GLXDRIdrawable *pdraw, int64_t target_msc, int64_t divisor,
 365                 int64_t remainder)
 366 {
 367     __GLXDRIdrawablePrivate *priv = (__GLXDRIdrawablePrivate *) pdraw;
 368     __GLXdisplayPrivate *dpyPriv = __glXInitialize(priv->base.psc->dpy);
 369     __GLXDRIdisplayPrivate *pdp =
 370         (__GLXDRIdisplayPrivate *)dpyPriv->dri2Display;
 371     int64_t ret;
 372
 373 #ifdef __DRI2_FLUSH
 374     if (pdraw->psc->f)
 375         (*pdraw->psc->f->flush)(pdraw->driDrawable);
 376 #endif
 377
 378     /* Old servers can't handle swapbuffers */
 379     if (!pdp->swapAvailable) {
 380        dri2CopySubBuffer(pdraw, 0, 0, priv->width, priv->height);
 381        return 0;
 382     }
 383
 384     DRI2SwapBuffers(pdraw->psc->dpy, pdraw->drawable, target_msc, divisor,
 385                     remainder, &ret);
 386
 387 #if __DRI2_FLUSH_VERSION >= 2
 388     if (pdraw->psc->f)
 389        (*pdraw->psc->f->flushInvalidate)(pdraw->driDrawable);
 390 #endif
 391
 392     return ret;
 393 }
 394
 395 static __DRIbuffer *
 396 dri2GetBuffers(__DRIdrawable * driDrawable,
 397                int *width, int *height,
 398                unsigned int *attachments, int count,
 399                int *out_count, void *loaderPrivate)
 400 {
 401    __GLXDRIdrawablePrivate *pdraw = loaderPrivate;
 402    DRI2Buffer *buffers;
 403
 404    buffers = DRI2GetBuffers(pdraw->base.psc->dpy, pdraw->base.xDrawable,
 405                             width, height, attachments, count, out_count);
 406    if (buffers == NULL)
 407       return NULL;
 408
 409    pdraw->width = *width;
 410    pdraw->height = *height;
 411    process_buffers(pdraw, buffers, *out_count);
 412
 413    Xfree(buffers);
 414
 415    return pdraw->buffers;
 416 }
 417
 418 static __DRIbuffer *
 419 dri2GetBuffersWithFormat(__DRIdrawable * driDrawable,
 420                          int *width, int *height,
 421                          unsigned int *attachments, int count,
 422                          int *out_count, void *loaderPrivate)
 423 {
 424    __GLXDRIdrawablePrivate *pdraw = loaderPrivate;
 425    DRI2Buffer *buffers;
 426
 427    buffers = DRI2GetBuffersWithFormat(pdraw->base.psc->dpy,
 428                                       pdraw->base.xDrawable,
 429                                       width, height, attachments,
 430                                       count, out_count);
 431    if (buffers == NULL)
 432       return NULL;
 433
 434    pdraw->width = *width;
 435    pdraw->height = *height;
 436    process_buffers(pdraw, buffers, *out_count);
 437
 438    Xfree(buffers);
 439
 440    return pdraw->buffers;
 441 }
 442
 443 static void
 444 dri2SetSwapInterval(__GLXDRIdrawable *pdraw, int interval)
 445 {
 446    __GLXDRIdrawablePrivate *priv =  (__GLXDRIdrawablePrivate *) pdraw;
 447
 448    DRI2SwapInterval(priv->base.psc->dpy, pdraw->xDrawable, interval);
 449    priv->swap_interval = interval;
 450 }
 451
 452 static unsigned int
 453 dri2GetSwapInterval(__GLXDRIdrawable *pdraw)
 454 {
 455    __GLXDRIdrawablePrivate *priv =  (__GLXDRIdrawablePrivate *) pdraw;
 456
 457   return priv->swap_interval;
 458 }
 459
 460 static const __DRIdri2LoaderExtension dri2LoaderExtension = {
 461    {__DRI_DRI2_LOADER, __DRI_DRI2_LOADER_VERSION},
 462    dri2GetBuffers,
 463    dri2FlushFrontBuffer,
 464    dri2GetBuffersWithFormat,
 465 };
 466
 467 static const __DRIdri2LoaderExtension dri2LoaderExtension_old = {
 468    {__DRI_DRI2_LOADER, __DRI_DRI2_LOADER_VERSION},
 469    dri2GetBuffers,
 470    dri2FlushFrontBuffer,
 471    NULL,
 472 };
 473
 474 static const __DRIextension *loader_extensions[] = {
 475    &dri2LoaderExtension.base,
 476    &systemTimeExtension.base,
 477    NULL
 478 };
 479
 480 static const __DRIextension *loader_extensions_old[] = {
 481    &dri2LoaderExtension_old.base,
 482    &systemTimeExtension.base,
 483    NULL
 484 };
 485
 486 static __GLXDRIscreen *
 487 dri2CreateScreen(__GLXscreenConfigs * psc, int screen,
 488                  __GLXdisplayPrivate * priv)
 489 {
 490    const __DRIconfig **driver_configs;
 491    const __DRIextension **extensions;
 492    const __GLXDRIdisplayPrivate *const pdp = (__GLXDRIdisplayPrivate *)
 493       priv->dri2Display;
 494    __GLXDRIscreen *psp;
 495    char *driverName, *deviceName;
 496    drm_magic_t magic;
 497    int i;
 498
 499    psp = Xmalloc(sizeof *psp);
 500    if (psp == NULL)
 501       return NULL;
 502
 503    /* Initialize per screen dynamic client GLX extensions */
 504    psc->ext_list_first_time = GL_TRUE;
 505
 506    if (!DRI2Connect(psc->dpy, RootWindow(psc->dpy, screen),
 507                     &driverName, &deviceName))
 508       return NULL;
 509
 510    psc->driver = driOpenDriver(driverName);
 511    if (psc->driver == NULL) {
 512       ErrorMessageF("driver pointer missing\n");
 513       goto handle_error;
 514    }
 515
 516    extensions = dlsym(psc->driver, __DRI_DRIVER_EXTENSIONS);
 517    if (extensions == NULL) {
 518       ErrorMessageF("driver exports no extensions (%s)\n", dlerror());
 519       goto handle_error;
 520    }
 521
 522    for (i = 0; extensions[i]; i++) {
 523       if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
 524          psc->core = (__DRIcoreExtension *) extensions[i];
 525       if (strcmp(extensions[i]->name, __DRI_DRI2) == 0)
 526          psc->dri2 = (__DRIdri2Extension *) extensions[i];
 527    }
 528
 529    if (psc->core == NULL || psc->dri2 == NULL) {
 530       ErrorMessageF("core dri or dri2 extension not found\n");
 531       goto handle_error;
 532    }
 533
 534    psc->fd = open(deviceName, O_RDWR);
 535    if (psc->fd < 0) {
 536       ErrorMessageF("failed to open drm device: %s\n", strerror(errno));
 537       return NULL;
 538    }
 539
 540    if (drmGetMagic(psc->fd, &magic)) {
 541       ErrorMessageF("failed to get magic\n");
 542       return NULL;
 543    }
 544
 545    if (!DRI2Authenticate(psc->dpy, RootWindow(psc->dpy, screen), magic)) {
 546       ErrorMessageF("failed to authenticate magic %d\n", magic);
 547       return NULL;
 548    }
 549
 550    /* If the server does not support the protocol for
 551     * DRI2GetBuffersWithFormat, don't supply that interface to the driver.
 552     */
 553    psc->__driScreen =
 554       psc->dri2->createNewScreen(screen, psc->fd, ((pdp->driMinor < 1)
 555                                                    ? loader_extensions_old
 556                                                    : loader_extensions),
 557                                  &driver_configs, psc);
 558
 559    if (psc->__driScreen == NULL) {
 560       ErrorMessageF("failed to create dri screen\n");
 561       return NULL;
 562    }
 563
 564    driBindCommonExtensions(psc);
 565    dri2BindExtensions(psc);
 566
 567    psc->configs = driConvertConfigs(psc->core, psc->configs, driver_configs);
 568    psc->visuals = driConvertConfigs(psc->core, psc->visuals, driver_configs);
 569
 570    psc->driver_configs = driver_configs;
 571
 572    psp->destroyScreen = dri2DestroyScreen;
 573    psp->createContext = dri2CreateContext;
 574    psp->createDrawable = dri2CreateDrawable;
 575    psp->swapBuffers = dri2SwapBuffers;
 576    psp->waitGL = dri2WaitGL;
 577    psp->waitX = dri2WaitX;
 578    psp->getDrawableMSC = dri2DrawableGetMSC;
 579    psp->waitForMSC = dri2WaitForMSC;
 580    psp->waitForSBC = dri2WaitForSBC;
 581    psp->setSwapInterval = dri2SetSwapInterval;
 582    psp->getSwapInterval = dri2GetSwapInterval;
 583
 584    /* DRI2 suports SubBuffer through DRI2CopyRegion, so it's always
 585     * available.*/
 586    psp->copySubBuffer = dri2CopySubBuffer;
 587    __glXEnableDirectExtension(psc, "GLX_MESA_copy_sub_buffer");
 588
 589    Xfree(driverName);
 590    Xfree(deviceName);
 591
 592    return psp;
 593
 594 handle_error:
 595    Xfree(driverName);
 596    Xfree(deviceName);
 597
 598    /* FIXME: clean up here */
 599
 600    return NULL;
 601 }
 602
 603 /* Called from __glXFreeDisplayPrivate.
 604  */
 605 static void
 606 dri2DestroyDisplay(__GLXDRIdisplay * dpy)
 607 {
 608    Xfree(dpy);
 609 }
 610
 611 /*
 612  * Allocate, initialize and return a __DRIdisplayPrivate object.
 613  * This is called from __glXInitialize() when we are given a new
 614  * display pointer.
 615  */
 616 _X_HIDDEN __GLXDRIdisplay *
 617 dri2CreateDisplay(Display * dpy)
 618 {
 619    __GLXDRIdisplayPrivate *pdp;
 620    int eventBase, errorBase;
 621
 622    if (!DRI2QueryExtension(dpy, &eventBase, &errorBase))
 623       return NULL;
 624
 625    pdp = Xmalloc(sizeof *pdp);
 626    if (pdp == NULL)
 627       return NULL;
 628
 629    if (!DRI2QueryVersion(dpy, &pdp->driMajor, &pdp->driMinor)) {
 630       Xfree(pdp);
 631       return NULL;
 632    }
 633
 634    pdp->driPatch = 0;
 635    pdp->swapAvailable = 0;
 636    if (pdp->driMinor >= 2)
 637       pdp->swapAvailable = 1;
 638
 639    pdp->base.destroyDisplay = dri2DestroyDisplay;
 640    pdp->base.createScreen = dri2CreateScreen;
 641
 642    return &pdp->base;
 643 }
 644
 645 #endif /* GLX_DIRECT_RENDERING */