src/mesa/drivers/dri/common/dri_util.c

   1 /**
   2  * \file dri_util.c
   3  * DRI utility functions.
   4  *
   5  * This module acts as glue between GLX and the actual hardware driver.  A DRI
   6  * driver doesn't really \e have to use any of this - it's optional.  But, some
   7  * useful stuff is done here that otherwise would have to be duplicated in most
   8  * drivers.
   9  *
  10  * Basically, these utility functions take care of some of the dirty details of
  11  * screen initialization, context creation, context binding, DRM setup, etc.
  12  *
  13  * These functions are compiled into each DRI driver so libGL.so knows nothing
  14  * about them.
  15  */
  16
  17
  18 #include <assert.h>
  19 #include <stdarg.h>
  20 #include <unistd.h>
  21 #include <sys/mman.h>
  22 #include <stdio.h>
  23
  24 #ifndef MAP_FAILED
  25 #define MAP_FAILED ((void *)-1)
  26 #endif
  27
  28 #include "main/imports.h"
  29 #define None 0
  30
  31 #include "dri_util.h"
  32 #include "drm_sarea.h"
  33 #include "utils.h"
  34 #include "xmlpool.h"
  35
  36 PUBLIC const char __dri2ConfigOptions[] =
  37    DRI_CONF_BEGIN
  38       DRI_CONF_SECTION_PERFORMANCE
  39          DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_1)
  40       DRI_CONF_SECTION_END
  41    DRI_CONF_END;
  42
  43 static const uint __dri2NConfigOptions = 1;
  44
  45 #ifndef GLX_OML_sync_control
  46 typedef GLboolean ( * PFNGLXGETMSCRATEOMLPROC) (__DRIdrawable *drawable, int32_t *numerator, int32_t *denominator);
  47 #endif
  48
  49 static void dri_get_drawable(__DRIdrawable *pdp);
  50 static void dri_put_drawable(__DRIdrawable *pdp);
  51
  52 /**
  53  * This is just a token extension used to signal that the driver
  54  * supports setting a read drawable.
  55  */
  56 const __DRIextension driReadDrawableExtension = {
  57     __DRI_READ_DRAWABLE, __DRI_READ_DRAWABLE_VERSION
  58 };
  59
  60 GLint
  61 driIntersectArea( drm_clip_rect_t rect1, drm_clip_rect_t rect2 )
  62 {
  63    if (rect2.x1 > rect1.x1) rect1.x1 = rect2.x1;
  64    if (rect2.x2 < rect1.x2) rect1.x2 = rect2.x2;
  65    if (rect2.y1 > rect1.y1) rect1.y1 = rect2.y1;
  66    if (rect2.y2 < rect1.y2) rect1.y2 = rect2.y2;
  67
  68    if (rect1.x1 > rect1.x2 || rect1.y1 > rect1.y2) return 0;
  69
  70    return (rect1.x2 - rect1.x1) * (rect1.y2 - rect1.y1);
  71 }
  72
  73 /*****************************************************************/
  74 /** \name Context (un)binding functions                          */
  75 /*****************************************************************/
  76 /*@{*/
  77
  78 /**
  79  * Unbind context.
  80  *
  81  * \param scrn the screen.
  82  * \param gc context.
  83  *
  84  * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
  85  *
  86  * \internal
  87  * This function calls __DriverAPIRec::UnbindContext, and then decrements
  88  * __DRIdrawableRec::refcount which must be non-zero for a successful
  89  * return.
  90  *
  91  * While casting the opaque private pointers associated with the parameters
  92  * into their respective real types it also assures they are not \c NULL.
  93  */
  94 static int driUnbindContext(__DRIcontext *pcp)
  95 {
  96     __DRIscreen *psp;
  97     __DRIdrawable *pdp;
  98     __DRIdrawable *prp;
  99
 100     /*
 101     ** Assume error checking is done properly in glXMakeCurrent before
 102     ** calling driUnbindContext.
 103     */
 104
 105     if (pcp == NULL)
 106         return GL_FALSE;
 107
 108     psp = pcp->driScreenPriv;
 109     pdp = pcp->driDrawablePriv;
 110     prp = pcp->driReadablePriv;
 111
 112     /* already unbound */
 113     if (!pdp && !prp)
 114       return GL_TRUE;
 115     /* Let driver unbind drawable from context */
 116     (*psp->DriverAPI.UnbindContext)(pcp);
 117
 118     assert(pdp);
 119     if (pdp->refcount == 0) {
 120         /* ERROR!!! */
 121         return GL_FALSE;
 122     }
 123
 124     dri_put_drawable(pdp);
 125
 126     if (prp != pdp) {
 127         if (prp->refcount == 0) {
 128             /* ERROR!!! */
 129             return GL_FALSE;
 130         }
 131
 132         dri_put_drawable(prp);
 133     }
 134
 135
 136     /* XXX this is disabled so that if we call SwapBuffers on an unbound
 137      * window we can determine the last context bound to the window and
 138      * use that context's lock. (BrianP, 2-Dec-2000)
 139      */
 140     pcp->driDrawablePriv = pcp->driReadablePriv = NULL;
 141
 142     return GL_TRUE;
 143 }
 144
 145 /**
 146  * This function takes both a read buffer and a draw buffer.  This is needed
 147  * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
 148  * function.
 149  */
 150 static int driBindContext(__DRIcontext *pcp,
 151                           __DRIdrawable *pdp,
 152                           __DRIdrawable *prp)
 153 {
 154     __DRIscreen *psp = NULL;
 155
 156     /*
 157     ** Assume error checking is done properly in glXMakeCurrent before
 158     ** calling driUnbindContext.
 159     */
 160
 161     if (!pcp)
 162         return GL_FALSE;
 163
 164     /* Bind the drawable to the context */
 165     psp = pcp->driScreenPriv;
 166     pcp->driDrawablePriv = pdp;
 167     pcp->driReadablePriv = prp;
 168     if (pdp) {
 169         pdp->driContextPriv = pcp;
 170         dri_get_drawable(pdp);
 171     }
 172     if (prp && pdp != prp) {
 173         dri_get_drawable(prp);
 174     }
 175
 176     /*
 177     ** Now that we have a context associated with this drawable, we can
 178     ** initialize the drawable information if has not been done before.
 179     */
 180
 181     if (!psp->dri2.enabled) {
 182         if (pdp && !pdp->pStamp) {
 183             DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 184             __driUtilUpdateDrawableInfo(pdp);
 185             DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 186         }
 187         if (prp && pdp != prp && !prp->pStamp) {
 188             DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 189             __driUtilUpdateDrawableInfo(prp);
 190             DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 191         }
 192     }
 193
 194     /* Call device-specific MakeCurrent */
 195     return (*psp->DriverAPI.MakeCurrent)(pcp, pdp, prp);
 196 }
 197
 198 /*@}*/
 199
 200
 201 /*****************************************************************/
 202 /** \name Drawable handling functions                            */
 203 /*****************************************************************/
 204 /*@{*/
 205
 206 /**
 207  * Update private drawable information.
 208  *
 209  * \param pdp pointer to the private drawable information to update.
 210  *
 211  * This function basically updates the __DRIdrawable struct's
 212  * cliprect information by calling \c __DRIinterfaceMethods::getDrawableInfo.
 213  * This is usually called by the DRI_VALIDATE_DRAWABLE_INFO macro which
 214  * compares the __DRIdrwablePrivate pStamp and lastStamp values.  If
 215  * the values are different that means we have to update the clipping
 216  * info.
 217  */
 218 void
 219 __driUtilUpdateDrawableInfo(__DRIdrawable *pdp)
 220 {
 221     __DRIscreen *psp = pdp->driScreenPriv;
 222     __DRIcontext *pcp = pdp->driContextPriv;
 223
 224     if (!pcp
 225         || ((pdp != pcp->driDrawablePriv) && (pdp != pcp->driReadablePriv))) {
 226         /* ERROR!!!
 227          * ...but we must ignore it. There can be many contexts bound to a
 228          * drawable.
 229          */
 230     }
 231
 232     if (pdp->pClipRects) {
 233         free(pdp->pClipRects);
 234         pdp->pClipRects = NULL;
 235     }
 236
 237     if (pdp->pBackClipRects) {
 238         free(pdp->pBackClipRects);
 239         pdp->pBackClipRects = NULL;
 240     }
 241
 242     DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 243
 244     if (! (*psp->getDrawableInfo->getDrawableInfo)(pdp,
 245                           &pdp->index, &pdp->lastStamp,
 246                           &pdp->x, &pdp->y, &pdp->w, &pdp->h,
 247                           &pdp->numClipRects, &pdp->pClipRects,
 248                           &pdp->backX,
 249                           &pdp->backY,
 250                           &pdp->numBackClipRects,
 251                           &pdp->pBackClipRects,
 252                           pdp->loaderPrivate)) {
 253         /* Error -- eg the window may have been destroyed.  Keep going
 254          * with no cliprects.
 255          */
 256         pdp->pStamp = &pdp->lastStamp; /* prevent endless loop */
 257         pdp->numClipRects = 0;
 258         pdp->pClipRects = NULL;
 259         pdp->numBackClipRects = 0;
 260         pdp->pBackClipRects = NULL;
 261     }
 262     else
 263        pdp->pStamp = &(psp->pSAREA->drawableTable[pdp->index].stamp);
 264
 265     DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 266 }
 267
 268 /*@}*/
 269
 270 /*****************************************************************/
 271 /** \name GLX callbacks                                          */
 272 /*****************************************************************/
 273 /*@{*/
 274
 275 static void driReportDamage(__DRIdrawable *pdp,
 276                             struct drm_clip_rect *pClipRects, int numClipRects)
 277 {
 278     __DRIscreen *psp = pdp->driScreenPriv;
 279
 280     /* Check that we actually have the new damage report method */
 281     if (psp->damage) {
 282         /* Report the damage.  Currently, all our drivers draw
 283          * directly to the front buffer, so we report the damage there
 284          * rather than to the backing storein (if any).
 285          */
 286         (*psp->damage->reportDamage)(pdp,
 287                                      pdp->x, pdp->y,
 288                                      pClipRects, numClipRects,
 289                                      GL_TRUE, pdp->loaderPrivate);
 290     }
 291 }
 292
 293
 294 /**
 295  * Swap buffers.
 296  *
 297  * \param drawablePrivate opaque pointer to the per-drawable private info.
 298  *
 299  * \internal
 300  * This function calls __DRIdrawable::swapBuffers.
 301  *
 302  * Is called directly from glXSwapBuffers().
 303  */
 304 static void driSwapBuffers(__DRIdrawable *dPriv)
 305 {
 306     __DRIscreen *psp = dPriv->driScreenPriv;
 307     drm_clip_rect_t *rects;
 308     int i;
 309
 310     psp->DriverAPI.SwapBuffers(dPriv);
 311
 312     if (!dPriv->numClipRects)
 313         return;
 314
 315     rects = malloc(sizeof(*rects) * dPriv->numClipRects);
 316
 317     if (!rects)
 318         return;
 319
 320     for (i = 0; i < dPriv->numClipRects; i++) {
 321         rects[i].x1 = dPriv->pClipRects[i].x1 - dPriv->x;
 322         rects[i].y1 = dPriv->pClipRects[i].y1 - dPriv->y;
 323         rects[i].x2 = dPriv->pClipRects[i].x2 - dPriv->x;
 324         rects[i].y2 = dPriv->pClipRects[i].y2 - dPriv->y;
 325     }
 326
 327     driReportDamage(dPriv, rects, dPriv->numClipRects);
 328     free(rects);
 329 }
 330
 331 static int driDrawableGetMSC( __DRIscreen *sPriv, __DRIdrawable *dPriv,
 332                               int64_t *msc )
 333 {
 334     return sPriv->DriverAPI.GetDrawableMSC(sPriv, dPriv, msc);
 335 }
 336
 337
 338 static int driWaitForMSC(__DRIdrawable *dPriv, int64_t target_msc,
 339                          int64_t divisor, int64_t remainder,
 340                          int64_t * msc, int64_t * sbc)
 341 {
 342     __DRIswapInfo  sInfo;
 343     int  status;
 344
 345     status = dPriv->driScreenPriv->DriverAPI.WaitForMSC( dPriv, target_msc,
 346                                                          divisor, remainder,
 347                                                          msc );
 348
 349     /* GetSwapInfo() may not be provided by the driver if GLX_SGI_video_sync
 350      * is supported but GLX_OML_sync_control is not.  Therefore, don't return
 351      * an error value if GetSwapInfo() is not implemented.
 352     */
 353     if ( status == 0
 354          && dPriv->driScreenPriv->DriverAPI.GetSwapInfo ) {
 355         status = dPriv->driScreenPriv->DriverAPI.GetSwapInfo( dPriv, & sInfo );
 356         *sbc = sInfo.swap_count;
 357     }
 358
 359     return status;
 360 }
 361
 362
 363 const __DRImediaStreamCounterExtension driMediaStreamCounterExtension = {
 364     { __DRI_MEDIA_STREAM_COUNTER, __DRI_MEDIA_STREAM_COUNTER_VERSION },
 365     driWaitForMSC,
 366     driDrawableGetMSC,
 367 };
 368
 369
 370 static void driCopySubBuffer(__DRIdrawable *dPriv,
 371                               int x, int y, int w, int h)
 372 {
 373     drm_clip_rect_t rect;
 374
 375     rect.x1 = x;
 376     rect.y1 = dPriv->h - y - h;
 377     rect.x2 = x + w;
 378     rect.y2 = rect.y1 + h;
 379     driReportDamage(dPriv, &rect, 1);
 380
 381     dPriv->driScreenPriv->DriverAPI.CopySubBuffer(dPriv, x, y, w, h);
 382 }
 383
 384 const __DRIcopySubBufferExtension driCopySubBufferExtension = {
 385     { __DRI_COPY_SUB_BUFFER, __DRI_COPY_SUB_BUFFER_VERSION },
 386     driCopySubBuffer
 387 };
 388
 389 static void driSetSwapInterval(__DRIdrawable *dPriv, unsigned int interval)
 390 {
 391     dPriv->swap_interval = interval;
 392 }
 393
 394 static unsigned int driGetSwapInterval(__DRIdrawable *dPriv)
 395 {
 396     return dPriv->swap_interval;
 397 }
 398
 399 const __DRIswapControlExtension driSwapControlExtension = {
 400     { __DRI_SWAP_CONTROL, __DRI_SWAP_CONTROL_VERSION },
 401     driSetSwapInterval,
 402     driGetSwapInterval
 403 };
 404
 405
 406 /**
 407  * This is called via __DRIscreenRec's createNewDrawable pointer.
 408  */
 409 static __DRIdrawable *
 410 driCreateNewDrawable(__DRIscreen *psp, const __DRIconfig *config,
 411                      drm_drawable_t hwDrawable, int renderType,
 412                      const int *attrs, void *data)
 413 {
 414     __DRIdrawable *pdp;
 415
 416     /* Since pbuffers are not yet supported, no drawable attributes are
 417      * supported either.
 418      */
 419     (void) attrs;
 420
 421     pdp = malloc(sizeof *pdp);
 422     if (!pdp) {
 423         return NULL;
 424     }
 425
 426     pdp->loaderPrivate = data;
 427     pdp->hHWDrawable = hwDrawable;
 428     pdp->refcount = 1;
 429     pdp->pStamp = NULL;
 430     pdp->lastStamp = 0;
 431     pdp->index = 0;
 432     pdp->x = 0;
 433     pdp->y = 0;
 434     pdp->w = 0;
 435     pdp->h = 0;
 436     pdp->numClipRects = 0;
 437     pdp->numBackClipRects = 0;
 438     pdp->pClipRects = NULL;
 439     pdp->pBackClipRects = NULL;
 440     pdp->vblSeq = 0;
 441     pdp->vblFlags = 0;
 442
 443     pdp->driScreenPriv = psp;
 444
 445     if (!(*psp->DriverAPI.CreateBuffer)(psp, pdp, &config->modes,
 446                                         renderType == GLX_PIXMAP_BIT)) {
 447        free(pdp);
 448        return NULL;
 449     }
 450
 451     pdp->msc_base = 0;
 452
 453     /* This special default value is replaced with the configured
 454      * default value when the drawable is first bound to a direct
 455      * rendering context.
 456      */
 457     pdp->swap_interval = (unsigned)-1;
 458
 459     return pdp;
 460 }
 461
 462
 463 static __DRIdrawable *
 464 dri2CreateNewDrawable(__DRIscreen *screen,
 465                       const __DRIconfig *config,
 466                       void *loaderPrivate)
 467 {
 468     __DRIdrawable *pdraw;
 469
 470     pdraw = driCreateNewDrawable(screen, config, 0, 0, NULL, loaderPrivate);
 471     if (!pdraw)
 472         return NULL;
 473
 474     pdraw->pClipRects = &pdraw->dri2.clipRect;
 475     pdraw->pBackClipRects = &pdraw->dri2.clipRect;
 476
 477     pdraw->pStamp = &pdraw->dri2.stamp;
 478     *pdraw->pStamp = pdraw->lastStamp + 1;
 479
 480     return pdraw;
 481 }
 482
 483 static int
 484 dri2ConfigQueryb(__DRIscreen *screen, const char *var, GLboolean *val)
 485 {
 486    if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
 487       return -1;
 488
 489    *val = driQueryOptionb(&screen->optionCache, var);
 490
 491    return 0;
 492 }
 493
 494 static int
 495 dri2ConfigQueryi(__DRIscreen *screen, const char *var, GLint *val)
 496 {
 497    if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
 498        !driCheckOption(&screen->optionCache, var, DRI_ENUM))
 499       return -1;
 500
 501     *val = driQueryOptioni(&screen->optionCache, var);
 502
 503     return 0;
 504 }
 505
 506 static int
 507 dri2ConfigQueryf(__DRIscreen *screen, const char *var, GLfloat *val)
 508 {
 509    if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
 510       return -1;
 511
 512     *val = driQueryOptionf(&screen->optionCache, var);
 513
 514     return 0;
 515 }
 516
 517
 518 static void dri_get_drawable(__DRIdrawable *pdp)
 519 {
 520     pdp->refcount++;
 521 }
 522
 523 static void dri_put_drawable(__DRIdrawable *pdp)
 524 {
 525     __DRIscreen *psp;
 526
 527     if (pdp) {
 528         pdp->refcount--;
 529         if (pdp->refcount)
 530             return;
 531
 532         psp = pdp->driScreenPriv;
 533         (*psp->DriverAPI.DestroyBuffer)(pdp);
 534         if (pdp->pClipRects && pdp->pClipRects != &pdp->dri2.clipRect) {
 535             free(pdp->pClipRects);
 536             pdp->pClipRects = NULL;
 537         }
 538         if (pdp->pBackClipRects && pdp->pClipRects != &pdp->dri2.clipRect) {
 539             free(pdp->pBackClipRects);
 540             pdp->pBackClipRects = NULL;
 541         }
 542         free(pdp);
 543     }
 544 }
 545
 546 static void
 547 driDestroyDrawable(__DRIdrawable *pdp)
 548 {
 549     dri_put_drawable(pdp);
 550 }
 551
 552 /*@}*/
 553
 554
 555 /*****************************************************************/
 556 /** \name Context handling functions                             */
 557 /*****************************************************************/
 558 /*@{*/
 559
 560 /**
 561  * Destroy the per-context private information.
 562  *
 563  * \internal
 564  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
 565  * drmDestroyContext(), and finally frees \p contextPrivate.
 566  */
 567 static void
 568 driDestroyContext(__DRIcontext *pcp)
 569 {
 570     if (pcp) {
 571         (*pcp->driScreenPriv->DriverAPI.DestroyContext)(pcp);
 572         free(pcp);
 573     }
 574 }
 575
 576
 577 /**
 578  * Create the per-drawable private driver information.
 579  *
 580  * \param render_type   Type of rendering target.  \c GLX_RGBA is the only
 581  *                      type likely to ever be supported for direct-rendering.
 582  * \param shared        Context with which to share textures, etc. or NULL
 583  *
 584  * \returns An opaque pointer to the per-context private information on
 585  *          success, or \c NULL on failure.
 586  *
 587  * \internal
 588  * This function allocates and fills a __DRIcontextRec structure.  It
 589  * performs some device independent initialization and passes all the
 590  * relevent information to __DriverAPIRec::CreateContext to create the
 591  * context.
 592  *
 593  */
 594 static __DRIcontext *
 595 driCreateNewContext(__DRIscreen *psp, const __DRIconfig *config,
 596                     int render_type, __DRIcontext *shared,
 597                     drm_context_t hwContext, void *data)
 598 {
 599     __DRIcontext *pcp;
 600     void * const shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 601
 602     pcp = malloc(sizeof *pcp);
 603     if (!pcp)
 604         return NULL;
 605
 606     pcp->driScreenPriv = psp;
 607     pcp->driDrawablePriv = NULL;
 608     pcp->loaderPrivate = data;
 609
 610     pcp->dri2.draw_stamp = 0;
 611     pcp->dri2.read_stamp = 0;
 612
 613     pcp->hHWContext = hwContext;
 614
 615     if ( !(*psp->DriverAPI.CreateContext)(&config->modes, pcp, shareCtx) ) {
 616         free(pcp);
 617         return NULL;
 618     }
 619
 620     return pcp;
 621 }
 622
 623
 624 static __DRIcontext *
 625 dri2CreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 626                       __DRIcontext *shared, void *data)
 627 {
 628     return driCreateNewContext(screen, config, 0, shared, 0, data);
 629 }
 630
 631
 632 static int
 633 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
 634 {
 635     return GL_FALSE;
 636 }
 637
 638 /*@}*/
 639
 640
 641 /*****************************************************************/
 642 /** \name Screen handling functions                              */
 643 /*****************************************************************/
 644 /*@{*/
 645
 646 /**
 647  * Destroy the per-screen private information.
 648  *
 649  * \internal
 650  * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
 651  * drmClose(), and finally frees \p screenPrivate.
 652  */
 653 static void driDestroyScreen(__DRIscreen *psp)
 654 {
 655     if (psp) {
 656         /* No interaction with the X-server is possible at this point.  This
 657          * routine is called after XCloseDisplay, so there is no protocol
 658          * stream open to the X-server anymore.
 659          */
 660
 661         if (psp->DriverAPI.DestroyScreen)
 662             (*psp->DriverAPI.DestroyScreen)(psp);
 663
 664         if (!psp->dri2.enabled) {
 665            (void)drmUnmap((drmAddress)psp->pSAREA, SAREA_MAX);
 666            (void)drmUnmap((drmAddress)psp->pFB, psp->fbSize);
 667            (void)drmCloseOnce(psp->fd);
 668         }
 669
 670         free(psp);
 671     }
 672 }
 673
 674 static void
 675 setupLoaderExtensions(__DRIscreen *psp,
 676                       const __DRIextension **extensions)
 677 {
 678     int i;
 679
 680     for (i = 0; extensions[i]; i++) {
 681         if (strcmp(extensions[i]->name, __DRI_GET_DRAWABLE_INFO) == 0)
 682             psp->getDrawableInfo = (__DRIgetDrawableInfoExtension *) extensions[i];
 683         if (strcmp(extensions[i]->name, __DRI_DAMAGE) == 0)
 684             psp->damage = (__DRIdamageExtension *) extensions[i];
 685         if (strcmp(extensions[i]->name, __DRI_SYSTEM_TIME) == 0)
 686             psp->systemTime = (__DRIsystemTimeExtension *) extensions[i];
 687         if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
 688             psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
 689         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)
 690             psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];
 691     }
 692 }
 693
 694 /**
 695  * This is the bootstrap function for the driver.  libGL supplies all of the
 696  * requisite information about the system, and the driver initializes itself.
 697  * This routine also fills in the linked list pointed to by \c driver_modes
 698  * with the \c __GLcontextModes that the driver can support for windows or
 699  * pbuffers.
 700  *
 701  * For legacy DRI.
 702  *
 703  * \param scrn  Index of the screen
 704  * \param ddx_version Version of the 2D DDX.  This may not be meaningful for
 705  *                    all drivers.
 706  * \param dri_version Version of the "server-side" DRI.
 707  * \param drm_version Version of the kernel DRM.
 708  * \param frame_buffer Data describing the location and layout of the
 709  *                     framebuffer.
 710  * \param pSAREA       Pointer to the SAREA.
 711  * \param fd           Device handle for the DRM.
 712  * \param extensions   ??
 713  * \param driver_modes  Returns modes suppoted by the driver
 714  * \param loaderPrivate  ??
 715  *
 716  * \note There is no need to check the minimum API version in this
 717  * function.  Since the name of this function is versioned, it is
 718  * impossible for a loader that is too old to even load this driver.
 719  */
 720 static __DRIscreen *
 721 driCreateNewScreen(int scrn,
 722                    const __DRIversion *ddx_version,
 723                    const __DRIversion *dri_version,
 724                    const __DRIversion *drm_version,
 725                    const __DRIframebuffer *frame_buffer,
 726                    drmAddress pSAREA, int fd,
 727                    const __DRIextension **extensions,
 728                    const __DRIconfig ***driver_modes,
 729                    void *loaderPrivate)
 730 {
 731     static const __DRIextension *emptyExtensionList[] = { NULL };
 732     __DRIscreen *psp;
 733
 734     psp = calloc(1, sizeof *psp);
 735     if (!psp)
 736         return NULL;
 737
 738     setupLoaderExtensions(psp, extensions);
 739
 740     /*
 741     ** NOT_DONE: This is used by the X server to detect when the client
 742     ** has died while holding the drawable lock.  The client sets the
 743     ** drawable lock to this value.
 744     */
 745     psp->drawLockID = 1;
 746
 747     psp->drm_version = *drm_version;
 748     psp->ddx_version = *ddx_version;
 749     psp->dri_version = *dri_version;
 750
 751     psp->pSAREA = pSAREA;
 752     psp->lock = (drmLock *) &psp->pSAREA->lock;
 753
 754     psp->pFB = frame_buffer->base;
 755     psp->fbSize = frame_buffer->size;
 756     psp->fbStride = frame_buffer->stride;
 757     psp->fbWidth = frame_buffer->width;
 758     psp->fbHeight = frame_buffer->height;
 759     psp->devPrivSize = frame_buffer->dev_priv_size;
 760     psp->pDevPriv = frame_buffer->dev_priv;
 761     psp->fbBPP = psp->fbStride * 8 / frame_buffer->width;
 762
 763     psp->extensions = emptyExtensionList;
 764     psp->fd = fd;
 765     psp->myNum = scrn;
 766     psp->dri2.enabled = GL_FALSE;
 767
 768     psp->DriverAPI = driDriverAPI;
 769
 770     *driver_modes = driDriverAPI.InitScreen(psp);
 771     if (*driver_modes == NULL) {
 772         free(psp);
 773         return NULL;
 774     }
 775
 776     return psp;
 777 }
 778
 779 /**
 780  * DRI2
 781  */
 782 static __DRIscreen *
 783 dri2CreateNewScreen(int scrn, int fd,
 784                     const __DRIextension **extensions,
 785                     const __DRIconfig ***driver_configs, void *data)
 786 {
 787     static const __DRIextension *emptyExtensionList[] = { NULL };
 788     __DRIscreen *psp;
 789     drmVersionPtr version;
 790     driOptionCache options;
 791
 792     if (driDriverAPI.InitScreen2 == NULL)
 793         return NULL;
 794
 795     psp = calloc(1, sizeof(*psp));
 796     if (!psp)
 797         return NULL;
 798
 799     setupLoaderExtensions(psp, extensions);
 800
 801     version = drmGetVersion(fd);
 802     if (version) {
 803         psp->drm_version.major = version->version_major;
 804         psp->drm_version.minor = version->version_minor;
 805         psp->drm_version.patch = version->version_patchlevel;
 806         drmFreeVersion(version);
 807     }
 808
 809     psp->extensions = emptyExtensionList;
 810     psp->fd = fd;
 811     psp->myNum = scrn;
 812     psp->dri2.enabled = GL_TRUE;
 813
 814     psp->DriverAPI = driDriverAPI;
 815     *driver_configs = driDriverAPI.InitScreen2(psp);
 816     if (*driver_configs == NULL) {
 817         free(psp);
 818         return NULL;
 819     }
 820
 821     psp->DriverAPI = driDriverAPI;
 822
 823     driParseOptionInfo(&options, __dri2ConfigOptions, __dri2NConfigOptions);
 824     driParseConfigFiles(&psp->optionCache, &options, psp->myNum, "dri2");
 825
 826     return psp;
 827 }
 828
 829 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 830 {
 831     return psp->extensions;
 832 }
 833
 834 /** Core interface */
 835 const __DRIcoreExtension driCoreExtension = {
 836     { __DRI_CORE, __DRI_CORE_VERSION },
 837     NULL,
 838     driDestroyScreen,
 839     driGetExtensions,
 840     driGetConfigAttrib,
 841     driIndexConfigAttrib,
 842     NULL,
 843     driDestroyDrawable,
 844     driSwapBuffers,
 845     NULL,
 846     driCopyContext,
 847     driDestroyContext,
 848     driBindContext,
 849     driUnbindContext
 850 };
 851
 852 /** Legacy DRI interface */
 853 const __DRIlegacyExtension driLegacyExtension = {
 854     { __DRI_LEGACY, __DRI_LEGACY_VERSION },
 855     driCreateNewScreen,
 856     driCreateNewDrawable,
 857     driCreateNewContext,
 858 };
 859
 860 /** DRI2 interface */
 861 const __DRIdri2Extension driDRI2Extension = {
 862     { __DRI_DRI2, __DRI_DRI2_VERSION },
 863     dri2CreateNewScreen,
 864     dri2CreateNewDrawable,
 865     dri2CreateNewContext,
 866 };
 867
 868 const __DRI2configQueryExtension dri2ConfigQueryExtension = {
 869    { __DRI2_CONFIG_QUERY, __DRI2_CONFIG_QUERY_VERSION },
 870    dri2ConfigQueryb,
 871    dri2ConfigQueryi,
 872    dri2ConfigQueryf,
 873 };
 874
 875 static int
 876 driFrameTracking(__DRIdrawable *drawable, GLboolean enable)
 877 {
 878     return GLX_BAD_CONTEXT;
 879 }
 880
 881 static int
 882 driQueryFrameTracking(__DRIdrawable *dpriv,
 883                       int64_t * sbc, int64_t * missedFrames,
 884                       float * lastMissedUsage, float * usage)
 885 {
 886    __DRIswapInfo   sInfo;
 887    int             status;
 888    int64_t         ust;
 889    __DRIscreen *psp = dpriv->driScreenPriv;
 890
 891    status = dpriv->driScreenPriv->DriverAPI.GetSwapInfo( dpriv, & sInfo );
 892    if ( status == 0 ) {
 893       *sbc = sInfo.swap_count;
 894       *missedFrames = sInfo.swap_missed_count;
 895       *lastMissedUsage = sInfo.swap_missed_usage;
 896
 897       (*psp->systemTime->getUST)( & ust );
 898       *usage = driCalculateSwapUsage( dpriv, sInfo.swap_ust, ust );
 899    }
 900
 901    return status;
 902 }
 903
 904 const __DRIframeTrackingExtension driFrameTrackingExtension = {
 905     { __DRI_FRAME_TRACKING, __DRI_FRAME_TRACKING_VERSION },
 906     driFrameTracking,
 907     driQueryFrameTracking
 908 };
 909
 910 /**
 911  * Calculate amount of swap interval used between GLX buffer swaps.
 912  *
 913  * The usage value, on the range [0,max], is the fraction of total swap
 914  * interval time used between GLX buffer swaps is calculated.
 915  *
 916  *            \f$p = t_d / (i * t_r)\f$
 917  *
 918  * Where \f$t_d\f$ is the time since the last GLX buffer swap, \f$i\f$ is the
 919  * swap interval (as set by \c glXSwapIntervalSGI), and \f$t_r\f$ time
 920  * required for a single vertical refresh period (as returned by \c
 921  * glXGetMscRateOML).
 922  *
 923  * See the documentation for the GLX_MESA_swap_frame_usage extension for more
 924  * details.
 925  *
 926  * \param   dPriv  Pointer to the private drawable structure.
 927  * \return  If less than a single swap interval time period was required
 928  *          between GLX buffer swaps, a number greater than 0 and less than
 929  *          1.0 is returned.  If exactly one swap interval time period is
 930  *          required, 1.0 is returned, and if more than one is required then
 931  *          a number greater than 1.0 will be returned.
 932  *
 933  * \sa glXSwapIntervalSGI glXGetMscRateOML
 934  *
 935  * \todo Instead of caching the \c glXGetMscRateOML function pointer, would it
 936  *       be possible to cache the sync rate?
 937  */
 938 float
 939 driCalculateSwapUsage( __DRIdrawable *dPriv, int64_t last_swap_ust,
 940                        int64_t current_ust )
 941 {
 942    int32_t   n;
 943    int32_t   d;
 944    int       interval;
 945    float     usage = 1.0;
 946    __DRIscreen *psp = dPriv->driScreenPriv;
 947
 948    if ( (*psp->systemTime->getMSCRate)(dPriv, &n, &d, dPriv->loaderPrivate) ) {
 949       interval = (dPriv->swap_interval != 0) ? dPriv->swap_interval : 1;
 950
 951
 952       /* We want to calculate
 953        * (current_UST - last_swap_UST) / (interval * us_per_refresh).  We get
 954        * current_UST by calling __glXGetUST.  last_swap_UST is stored in
 955        * dPriv->swap_ust.  interval has already been calculated.
 956        *
 957        * The only tricky part is us_per_refresh.  us_per_refresh is
 958        * 1000000 / MSC_rate.  We know the MSC_rate is n / d.  We can flip it
 959        * around and say us_per_refresh = 1000000 * d / n.  Since this goes in
 960        * the denominator of the final calculation, we calculate
 961        * (interval * 1000000 * d) and move n into the numerator.
 962        */
 963
 964       usage = (current_ust - last_swap_ust);
 965       usage *= n;
 966       usage /= (interval * d);
 967       usage /= 1000000.0;
 968    }
 969
 970    return usage;
 971 }
 972
 973 void
 974 dri2InvalidateDrawable(__DRIdrawable *drawable)
 975 {
 976     drawable->dri2.stamp++;
 977 }
 978
 979 /*@}*/