src/glx/x11/dri2.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
  34 #ifdef GLX_DIRECT_RENDERING
  35
  36 #define NEED_REPLIES
  37 #include <stdio.h>
  38 #include <X11/Xlibint.h>
  39 #include <X11/extensions/Xext.h>
  40 #include <X11/extensions/extutil.h>
  41 #include <X11/extensions/dri2proto.h>
  42 #include "xf86drm.h"
  43 #include "dri2.h"
  44 #include "glxclient.h"
  45 #include "GL/glxext.h"
  46
  47 /* Allow the build to work with an older versions of dri2proto.h and
  48  * dri2tokens.h.
  49  */
  50 #if DRI2_MINOR < 1
  51 #undef DRI2_MINOR
  52 #define DRI2_MINOR 1
  53 #define X_DRI2GetBuffersWithFormat 7
  54 #endif
  55
  56
  57 static char dri2ExtensionName[] = DRI2_NAME;
  58 static XExtensionInfo *dri2Info;
  59 static XEXT_GENERATE_CLOSE_DISPLAY (DRI2CloseDisplay, dri2Info)
  60
  61 static Bool
  62 DRI2WireToEvent(Display *dpy, XEvent *event, xEvent *wire);
  63 static Status
  64 DRI2EventToWire(Display *dpy, XEvent *event, xEvent *wire);
  65
  66 static /* const */ XExtensionHooks dri2ExtensionHooks = {
  67   NULL,                   /* create_gc */
  68   NULL,                   /* copy_gc */
  69   NULL,                   /* flush_gc */
  70   NULL,                   /* free_gc */
  71   NULL,                   /* create_font */
  72   NULL,                   /* free_font */
  73   DRI2CloseDisplay,       /* close_display */
  74   DRI2WireToEvent,        /* wire_to_event */
  75   DRI2EventToWire,        /* event_to_wire */
  76   NULL,                   /* error */
  77   NULL,                   /* error_string */
  78 };
  79
  80 static XEXT_GENERATE_FIND_DISPLAY (DRI2FindDisplay,
  81                                    dri2Info,
  82                                    dri2ExtensionName,
  83                                    &dri2ExtensionHooks,
  84                                    1, NULL)
  85
  86 static Bool
  87 DRI2WireToEvent(Display *dpy, XEvent *event, xEvent *wire)
  88 {
  89    XExtDisplayInfo *info = DRI2FindDisplay(dpy);
  90    XExtDisplayInfo *glx_info = __glXFindDisplay(dpy);
  91    static int glx_event_base;
  92    static Bool found_glx_info = False;
  93
  94    XextCheckExtension(dpy, info, dri2ExtensionName, False);
  95
  96    switch ((wire->u.u.type & 0x7f) - info->codes->first_event) {
  97    case DRI2_BufferSwapComplete:
  98    {
  99       GLXBufferSwapComplete *aevent = (GLXBufferSwapComplete *)event;
 100       xDRI2BufferSwapComplete *awire = (xDRI2BufferSwapComplete *)wire;
 101       aevent->serial = _XSetLastRequestRead(dpy, (xGenericReply *) wire);
 102       aevent->type =
 103           (glx_info->codes->first_event + GLX_BufferSwapComplete) & 0x75;
 104       aevent->send_event = (awire->type & 0x80) != 0;
 105       aevent->display = dpy;
 106       aevent->drawable = awire->drawable;
 107       switch (awire->event_type) {
 108       case DRI2_EXCHANGE_COMPLETE:
 109          aevent->event_type = GLX_EXCHANGE_COMPLETE_INTEL;
 110          break;
 111       case DRI2_BLIT_COMPLETE:
 112          aevent->event_type = GLX_BLIT_COMPLETE_INTEL;
 113          break;
 114       case DRI2_FLIP_COMPLETE:
 115          aevent->event_type = GLX_FLIP_COMPLETE_INTEL;
 116          break;
 117       default:
 118          /* unknown swap completion type */
 119          return False;
 120       }
 121       aevent->ust = ((CARD64)awire->ust_hi << 32) | awire->ust_lo;
 122       aevent->msc = ((CARD64)awire->msc_hi << 32) | awire->msc_lo;
 123       aevent->sbc = ((CARD64)awire->sbc_hi << 32) | awire->sbc_lo;
 124       return True;
 125    }
 126    default:
 127       /* client doesn't support server event */
 128       break;
 129    }
 130
 131    return False;
 132 }
 133
 134 /* We don't actually support this.  It doesn't make sense for clients to
 135  * send each other DRI2 events.
 136  */
 137 static Status
 138 DRI2EventToWire(Display *dpy, XEvent *event, xEvent *wire)
 139 {
 140    XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 141
 142    XextCheckExtension(dpy, info, dri2ExtensionName, False);
 143
 144    switch (event->type) {
 145    default:
 146       /* client doesn't support server event */
 147       break;
 148    }
 149
 150    return Success;
 151 }
 152
 153 Bool
 154 DRI2QueryExtension(Display * dpy, int *eventBase, int *errorBase)
 155 {
 156    XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 157
 158    if (XextHasExtension(info)) {
 159       *eventBase = info->codes->first_event;
 160       *errorBase = info->codes->first_error;
 161       return True;
 162    }
 163
 164    return False;
 165 }
 166
 167 Bool
 168 DRI2QueryVersion(Display * dpy, int *major, int *minor)
 169 {
 170    XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 171    xDRI2QueryVersionReply rep;
 172    xDRI2QueryVersionReq *req;
 173
 174    XextCheckExtension(dpy, info, dri2ExtensionName, False);
 175
 176    LockDisplay(dpy);
 177    GetReq(DRI2QueryVersion, req);
 178    req->reqType = info->codes->major_opcode;
 179    req->dri2ReqType = X_DRI2QueryVersion;
 180    req->majorVersion = DRI2_MAJOR;
 181    req->minorVersion = DRI2_MINOR;
 182    if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
 183       UnlockDisplay(dpy);
 184       SyncHandle();
 185       return False;
 186    }
 187    *major = rep.majorVersion;
 188    *minor = rep.minorVersion;
 189    UnlockDisplay(dpy);
 190    SyncHandle();
 191
 192    return True;
 193 }
 194
 195 Bool
 196 DRI2Connect(Display * dpy, XID window, char **driverName, char **deviceName)
 197 {
 198    XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 199    xDRI2ConnectReply rep;
 200    xDRI2ConnectReq *req;
 201
 202    XextCheckExtension(dpy, info, dri2ExtensionName, False);
 203
 204    LockDisplay(dpy);
 205    GetReq(DRI2Connect, req);
 206    req->reqType = info->codes->major_opcode;
 207    req->dri2ReqType = X_DRI2Connect;
 208    req->window = window;
 209    req->driverType = DRI2DriverDRI;
 210    if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
 211       UnlockDisplay(dpy);
 212       SyncHandle();
 213       return False;
 214    }
 215
 216    if (rep.driverNameLength == 0 && rep.deviceNameLength == 0) {
 217       UnlockDisplay(dpy);
 218       SyncHandle();
 219       return False;
 220    }
 221
 222    *driverName = Xmalloc(rep.driverNameLength + 1);
 223    if (*driverName == NULL) {
 224       _XEatData(dpy,
 225                 ((rep.driverNameLength + 3) & ~3) +
 226                 ((rep.deviceNameLength + 3) & ~3));
 227       UnlockDisplay(dpy);
 228       SyncHandle();
 229       return False;
 230    }
 231    _XReadPad(dpy, *driverName, rep.driverNameLength);
 232    (*driverName)[rep.driverNameLength] = '\0';
 233
 234    *deviceName = Xmalloc(rep.deviceNameLength + 1);
 235    if (*deviceName == NULL) {
 236       Xfree(*driverName);
 237       _XEatData(dpy, ((rep.deviceNameLength + 3) & ~3));
 238       UnlockDisplay(dpy);
 239       SyncHandle();
 240       return False;
 241    }
 242    _XReadPad(dpy, *deviceName, rep.deviceNameLength);
 243    (*deviceName)[rep.deviceNameLength] = '\0';
 244
 245    UnlockDisplay(dpy);
 246    SyncHandle();
 247
 248    return True;
 249 }
 250
 251 Bool
 252 DRI2Authenticate(Display * dpy, XID window, drm_magic_t magic)
 253 {
 254    XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 255    xDRI2AuthenticateReq *req;
 256    xDRI2AuthenticateReply rep;
 257
 258    XextCheckExtension(dpy, info, dri2ExtensionName, False);
 259
 260    LockDisplay(dpy);
 261    GetReq(DRI2Authenticate, req);
 262    req->reqType = info->codes->major_opcode;
 263    req->dri2ReqType = X_DRI2Authenticate;
 264    req->window = window;
 265    req->magic = magic;
 266
 267    if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
 268       UnlockDisplay(dpy);
 269       SyncHandle();
 270       return False;
 271    }
 272
 273    UnlockDisplay(dpy);
 274    SyncHandle();
 275
 276    return rep.authenticated;
 277 }
 278
 279 void
 280 DRI2CreateDrawable(Display * dpy, XID drawable)
 281 {
 282    XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 283    xDRI2CreateDrawableReq *req;
 284
 285    XextSimpleCheckExtension(dpy, info, dri2ExtensionName);
 286
 287    LockDisplay(dpy);
 288    GetReq(DRI2CreateDrawable, req);
 289    req->reqType = info->codes->major_opcode;
 290    req->dri2ReqType = X_DRI2CreateDrawable;
 291    req->drawable = drawable;
 292    UnlockDisplay(dpy);
 293    SyncHandle();
 294 }
 295
 296 void
 297 DRI2DestroyDrawable(Display * dpy, XID drawable)
 298 {
 299    XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 300    xDRI2DestroyDrawableReq *req;
 301
 302    XextSimpleCheckExtension(dpy, info, dri2ExtensionName);
 303
 304    XSync(dpy, False);
 305
 306    LockDisplay(dpy);
 307    GetReq(DRI2DestroyDrawable, req);
 308    req->reqType = info->codes->major_opcode;
 309    req->dri2ReqType = X_DRI2DestroyDrawable;
 310    req->drawable = drawable;
 311    UnlockDisplay(dpy);
 312    SyncHandle();
 313 }
 314
 315 DRI2Buffer *
 316 DRI2GetBuffers(Display * dpy, XID drawable,
 317                int *width, int *height,
 318                unsigned int *attachments, int count, int *outCount)
 319 {
 320    XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 321    xDRI2GetBuffersReply rep;
 322    xDRI2GetBuffersReq *req;
 323    DRI2Buffer *buffers;
 324    xDRI2Buffer repBuffer;
 325    CARD32 *p;
 326    int i;
 327
 328    XextCheckExtension(dpy, info, dri2ExtensionName, False);
 329
 330    LockDisplay(dpy);
 331    GetReqExtra(DRI2GetBuffers, count * 4, req);
 332    req->reqType = info->codes->major_opcode;
 333    req->dri2ReqType = X_DRI2GetBuffers;
 334    req->drawable = drawable;
 335    req->count = count;
 336    p = (CARD32 *) & req[1];
 337    for (i = 0; i < count; i++)
 338       p[i] = attachments[i];
 339
 340    if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
 341       UnlockDisplay(dpy);
 342       SyncHandle();
 343       return NULL;
 344    }
 345
 346    *width = rep.width;
 347    *height = rep.height;
 348    *outCount = rep.count;
 349
 350    buffers = Xmalloc(rep.count * sizeof buffers[0]);
 351    if (buffers == NULL) {
 352       _XEatData(dpy, rep.count * sizeof repBuffer);
 353       UnlockDisplay(dpy);
 354       SyncHandle();
 355       return NULL;
 356    }
 357
 358    for (i = 0; i < rep.count; i++) {
 359       _XReadPad(dpy, (char *) &repBuffer, sizeof repBuffer);
 360       buffers[i].attachment = repBuffer.attachment;
 361       buffers[i].name = repBuffer.name;
 362       buffers[i].pitch = repBuffer.pitch;
 363       buffers[i].cpp = repBuffer.cpp;
 364       buffers[i].flags = repBuffer.flags;
 365    }
 366
 367    UnlockDisplay(dpy);
 368    SyncHandle();
 369
 370    return buffers;
 371 }
 372
 373
 374 DRI2Buffer *
 375 DRI2GetBuffersWithFormat(Display * dpy, XID drawable,
 376                          int *width, int *height,
 377                          unsigned int *attachments, int count, int *outCount)
 378 {
 379    XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 380    xDRI2GetBuffersReply rep;
 381    xDRI2GetBuffersReq *req;
 382    DRI2Buffer *buffers;
 383    xDRI2Buffer repBuffer;
 384    CARD32 *p;
 385    int i;
 386
 387    XextCheckExtension(dpy, info, dri2ExtensionName, False);
 388
 389    LockDisplay(dpy);
 390    GetReqExtra(DRI2GetBuffers, count * (4 * 2), req);
 391    req->reqType = info->codes->major_opcode;
 392    req->dri2ReqType = X_DRI2GetBuffersWithFormat;
 393    req->drawable = drawable;
 394    req->count = count;
 395    p = (CARD32 *) & req[1];
 396    for (i = 0; i < (count * 2); i++)
 397       p[i] = attachments[i];
 398
 399    if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
 400       UnlockDisplay(dpy);
 401       SyncHandle();
 402       return NULL;
 403    }
 404
 405    *width = rep.width;
 406    *height = rep.height;
 407    *outCount = rep.count;
 408
 409    buffers = Xmalloc(rep.count * sizeof buffers[0]);
 410    if (buffers == NULL) {
 411       _XEatData(dpy, rep.count * sizeof repBuffer);
 412       UnlockDisplay(dpy);
 413       SyncHandle();
 414       return NULL;
 415    }
 416
 417    for (i = 0; i < rep.count; i++) {
 418       _XReadPad(dpy, (char *) &repBuffer, sizeof repBuffer);
 419       buffers[i].attachment = repBuffer.attachment;
 420       buffers[i].name = repBuffer.name;
 421       buffers[i].pitch = repBuffer.pitch;
 422       buffers[i].cpp = repBuffer.cpp;
 423       buffers[i].flags = repBuffer.flags;
 424    }
 425
 426    UnlockDisplay(dpy);
 427    SyncHandle();
 428
 429    return buffers;
 430 }
 431
 432
 433 void
 434 DRI2CopyRegion(Display * dpy, XID drawable, XserverRegion region,
 435                CARD32 dest, CARD32 src)
 436 {
 437    XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 438    xDRI2CopyRegionReq *req;
 439    xDRI2CopyRegionReply rep;
 440
 441    XextSimpleCheckExtension(dpy, info, dri2ExtensionName);
 442
 443    LockDisplay(dpy);
 444    GetReq(DRI2CopyRegion, req);
 445    req->reqType = info->codes->major_opcode;
 446    req->dri2ReqType = X_DRI2CopyRegion;
 447    req->drawable = drawable;
 448    req->region = region;
 449    req->dest = dest;
 450    req->src = src;
 451
 452    _XReply(dpy, (xReply *) & rep, 0, xFalse);
 453
 454    UnlockDisplay(dpy);
 455    SyncHandle();
 456 }
 457
 458 static void
 459 load_swap_req(xDRI2SwapBuffersReq *req, CARD64 target, CARD64 divisor,
 460              CARD64 remainder)
 461 {
 462     req->target_msc_hi = target >> 32;
 463     req->target_msc_lo = target & 0xffffffff;
 464     req->divisor_hi = divisor >> 32;
 465     req->divisor_lo = divisor & 0xffffffff;
 466     req->remainder_hi = remainder >> 32;
 467     req->remainder_lo = remainder & 0xffffffff;
 468 }
 469
 470 static CARD64
 471 vals_to_card64(CARD32 lo, CARD32 hi)
 472 {
 473     return (CARD64)hi << 32 | lo;
 474 }
 475
 476 void DRI2SwapBuffers(Display *dpy, XID drawable, CARD64 target_msc,
 477                      CARD64 divisor, CARD64 remainder, CARD64 *count)
 478 {
 479     XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 480     xDRI2SwapBuffersReq *req;
 481     xDRI2SwapBuffersReply rep;
 482
 483     XextSimpleCheckExtension (dpy, info, dri2ExtensionName);
 484
 485     LockDisplay(dpy);
 486     GetReq(DRI2SwapBuffers, req);
 487     req->reqType = info->codes->major_opcode;
 488     req->dri2ReqType = X_DRI2SwapBuffers;
 489     req->drawable = drawable;
 490     load_swap_req(req, target_msc, divisor, remainder);
 491
 492     _XReply(dpy, (xReply *)&rep, 0, xFalse);
 493
 494     *count = vals_to_card64(rep.swap_lo, rep.swap_hi);
 495
 496     UnlockDisplay(dpy);
 497     SyncHandle();
 498 }
 499
 500 Bool DRI2GetMSC(Display *dpy, XID drawable, CARD64 *ust, CARD64 *msc,
 501                 CARD64 *sbc)
 502 {
 503     XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 504     xDRI2GetMSCReq *req;
 505     xDRI2MSCReply rep;
 506
 507     XextCheckExtension (dpy, info, dri2ExtensionName, False);
 508
 509     LockDisplay(dpy);
 510     GetReq(DRI2GetMSC, req);
 511     req->reqType = info->codes->major_opcode;
 512     req->dri2ReqType = X_DRI2GetMSC;
 513     req->drawable = drawable;
 514
 515     if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
 516         UnlockDisplay(dpy);
 517         SyncHandle();
 518         return False;
 519     }
 520
 521     *ust = vals_to_card64(rep.ust_lo, rep.ust_hi);
 522     *msc = vals_to_card64(rep.msc_lo, rep.msc_hi);
 523     *sbc = vals_to_card64(rep.sbc_lo, rep.sbc_hi);
 524
 525     UnlockDisplay(dpy);
 526     SyncHandle();
 527
 528     return True;
 529 }
 530
 531 static void
 532 load_msc_req(xDRI2WaitMSCReq *req, CARD64 target, CARD64 divisor,
 533              CARD64 remainder)
 534 {
 535     req->target_msc_hi = target >> 32;
 536     req->target_msc_lo = target & 0xffffffff;
 537     req->divisor_hi = divisor >> 32;
 538     req->divisor_lo = divisor & 0xffffffff;
 539     req->remainder_hi = remainder >> 32;
 540     req->remainder_lo = remainder & 0xffffffff;
 541 }
 542
 543 Bool DRI2WaitMSC(Display *dpy, XID drawable, CARD64 target_msc, CARD64 divisor,
 544                  CARD64 remainder, CARD64 *ust, CARD64 *msc, CARD64 *sbc)
 545 {
 546     XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 547     xDRI2WaitMSCReq *req;
 548     xDRI2MSCReply rep;
 549
 550     XextCheckExtension (dpy, info, dri2ExtensionName, False);
 551
 552     LockDisplay(dpy);
 553     GetReq(DRI2WaitMSC, req);
 554     req->reqType = info->codes->major_opcode;
 555     req->dri2ReqType = X_DRI2WaitMSC;
 556     req->drawable = drawable;
 557     load_msc_req(req, target_msc, divisor, remainder);
 558
 559     if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
 560         UnlockDisplay(dpy);
 561         SyncHandle();
 562         return False;
 563     }
 564
 565     *ust = ((CARD64)rep.ust_hi << 32) | (CARD64)rep.ust_lo;
 566     *msc = ((CARD64)rep.msc_hi << 32) | (CARD64)rep.msc_lo;
 567     *sbc = ((CARD64)rep.sbc_hi << 32) | (CARD64)rep.sbc_lo;
 568
 569     UnlockDisplay(dpy);
 570     SyncHandle();
 571
 572     return True;
 573 }
 574
 575 static void
 576 load_sbc_req(xDRI2WaitSBCReq *req, CARD64 target)
 577 {
 578     req->target_sbc_hi = target >> 32;
 579     req->target_sbc_lo = target & 0xffffffff;
 580 }
 581
 582 Bool DRI2WaitSBC(Display *dpy, XID drawable, CARD64 target_sbc, CARD64 *ust,
 583                  CARD64 *msc, CARD64 *sbc)
 584 {
 585     XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 586     xDRI2WaitSBCReq *req;
 587     xDRI2MSCReply rep;
 588
 589     XextCheckExtension (dpy, info, dri2ExtensionName, False);
 590
 591     LockDisplay(dpy);
 592     GetReq(DRI2WaitSBC, req);
 593     req->reqType = info->codes->major_opcode;
 594     req->dri2ReqType = X_DRI2WaitSBC;
 595     req->drawable = drawable;
 596     load_sbc_req(req, target_sbc);
 597
 598     if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
 599         UnlockDisplay(dpy);
 600         SyncHandle();
 601         return False;
 602     }
 603
 604     *ust = ((CARD64)rep.ust_hi << 32) | rep.ust_lo;
 605     *msc = ((CARD64)rep.msc_hi << 32) | rep.msc_lo;
 606     *sbc = ((CARD64)rep.sbc_hi << 32) | rep.sbc_lo;
 607
 608     UnlockDisplay(dpy);
 609     SyncHandle();
 610
 611     return True;
 612 }
 613
 614 void DRI2SwapInterval(Display *dpy, XID drawable, int interval)
 615 {
 616     XExtDisplayInfo *info = DRI2FindDisplay(dpy);
 617     xDRI2SwapIntervalReq *req;
 618
 619     XextSimpleCheckExtension (dpy, info, dri2ExtensionName);
 620
 621     LockDisplay(dpy);
 622     GetReq(DRI2SwapInterval, req);
 623     req->reqType = info->codes->major_opcode;
 624     req->dri2ReqType = X_DRI2SwapInterval;
 625     req->drawable = drawable;
 626     req->interval = interval;
 627     UnlockDisplay(dpy);
 628     SyncHandle();
 629 }
 630
 631 #endif /* GLX_DIRECT_RENDERING */