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

   1 /* $XFree86: xc/lib/GL/dri/dri_util.c,v 1.7 2003/04/28 17:01:25 dawes Exp $ */
   2 /**
   3  * \file dri_util.c
   4  * DRI utility functions.
   5  *
   6  * This module acts as glue between GLX and the actual hardware driver.  A DRI
   7  * driver doesn't really \e have to use any of this - it's optional.  But, some
   8  * useful stuff is done here that otherwise would have to be duplicated in most
   9  * drivers.
  10  *
  11  * Basically, these utility functions take care of some of the dirty details of
  12  * screen initialization, context creation, context binding, DRM setup, etc.
  13  *
  14  * These functions are compiled into each DRI driver so libGL.so knows nothing
  15  * about them.
  16  */
  17
  18
  19 #include <assert.h>
  20 #include <stdarg.h>
  21 #include <unistd.h>
  22 #include <sys/mman.h>
  23 #include <stdio.h>
  24
  25 #ifndef MAP_FAILED
  26 #define MAP_FAILED ((void *)-1)
  27 #endif
  28
  29 #include "main/imports.h"
  30 #define None 0
  31
  32 #include "dri_util.h"
  33 #include "drm_sarea.h"
  34 #include "utils.h"
  35
  36 #ifndef GLX_OML_sync_control
  37 typedef GLboolean ( * PFNGLXGETMSCRATEOMLPROC) (__DRIdrawable *drawable, int32_t *numerator, int32_t *denominator);
  38 #endif
  39
  40 /**
  41  * This is just a token extension used to signal that the driver
  42  * supports setting a read drawable.
  43  */
  44 const __DRIextension driReadDrawableExtension = {
  45     __DRI_READ_DRAWABLE, __DRI_READ_DRAWABLE_VERSION
  46 };
  47
  48 /**
  49  * Print message to \c stderr if the \c LIBGL_DEBUG environment variable
  50  * is set.
  51  *
  52  * Is called from the drivers.
  53  *
  54  * \param f \c printf like format string.
  55  */
  56 void
  57 __driUtilMessage(const char *f, ...)
  58 {
  59     va_list args;
  60
  61     if (getenv("LIBGL_DEBUG")) {
  62         fprintf(stderr, "libGL error: \n");
  63         va_start(args, f);
  64         vfprintf(stderr, f, args);
  65         va_end(args);
  66         fprintf(stderr, "\n");
  67     }
  68 }
  69
  70 GLint
  71 driIntersectArea( drm_clip_rect_t rect1, drm_clip_rect_t rect2 )
  72 {
  73    if (rect2.x1 > rect1.x1) rect1.x1 = rect2.x1;
  74    if (rect2.x2 < rect1.x2) rect1.x2 = rect2.x2;
  75    if (rect2.y1 > rect1.y1) rect1.y1 = rect2.y1;
  76    if (rect2.y2 < rect1.y2) rect1.y2 = rect2.y2;
  77
  78    if (rect1.x1 > rect1.x2 || rect1.y1 > rect1.y2) return 0;
  79
  80    return (rect1.x2 - rect1.x1) * (rect1.y2 - rect1.y1);
  81 }
  82
  83 /*****************************************************************/
  84 /** \name Context (un)binding functions                          */
  85 /*****************************************************************/
  86 /*@{*/
  87
  88 /**
  89  * Unbind context.
  90  *
  91  * \param scrn the screen.
  92  * \param gc context.
  93  *
  94  * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
  95  *
  96  * \internal
  97  * This function calls __DriverAPIRec::UnbindContext, and then decrements
  98  * __DRIdrawablePrivateRec::refcount which must be non-zero for a successful
  99  * return.
 100  *
 101  * While casting the opaque private pointers associated with the parameters
 102  * into their respective real types it also assures they are not \c NULL.
 103  */
 104 static int driUnbindContext(__DRIcontext *pcp)
 105 {
 106     __DRIscreen *psp;
 107     __DRIdrawable *pdp;
 108     __DRIdrawable *prp;
 109
 110     /*
 111     ** Assume error checking is done properly in glXMakeCurrent before
 112     ** calling driUnbindContext.
 113     */
 114
 115     if (pcp == NULL)
 116         return GL_FALSE;
 117
 118     psp = pcp->driScreenPriv;
 119     pdp = pcp->driDrawablePriv;
 120     prp = pcp->driReadablePriv;
 121
 122     /* Let driver unbind drawable from context */
 123     (*psp->DriverAPI.UnbindContext)(pcp);
 124
 125     if (pdp->refcount == 0) {
 126         /* ERROR!!! */
 127         return GL_FALSE;
 128     }
 129
 130     pdp->refcount--;
 131
 132     if (prp != pdp) {
 133         if (prp->refcount == 0) {
 134             /* ERROR!!! */
 135             return GL_FALSE;
 136         }
 137
 138         prp->refcount--;
 139     }
 140
 141
 142     /* XXX this is disabled so that if we call SwapBuffers on an unbound
 143      * window we can determine the last context bound to the window and
 144      * use that context's lock. (BrianP, 2-Dec-2000)
 145      */
 146 #if 0
 147     /* Unbind the drawable */
 148     pcp->driDrawablePriv = NULL;
 149     pdp->driContextPriv = &psp->dummyContextPriv;
 150 #endif
 151
 152     return GL_TRUE;
 153 }
 154
 155 /**
 156  * This function takes both a read buffer and a draw buffer.  This is needed
 157  * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
 158  * function.
 159  */
 160 static int driBindContext(__DRIcontext *pcp,
 161                           __DRIdrawable *pdp,
 162                           __DRIdrawable *prp)
 163 {
 164     __DRIscreenPrivate *psp = pcp->driScreenPriv;
 165
 166     /*
 167     ** Assume error checking is done properly in glXMakeCurrent before
 168     ** calling driBindContext.
 169     */
 170
 171     if (pcp == NULL || pdp == None || prp == None)
 172         return GL_FALSE;
 173
 174     /* Bind the drawable to the context */
 175     pcp->driDrawablePriv = pdp;
 176     pcp->driReadablePriv = prp;
 177     pdp->driContextPriv = pcp;
 178     pdp->refcount++;
 179     if ( pdp != prp ) {
 180         prp->refcount++;
 181     }
 182
 183     /*
 184     ** Now that we have a context associated with this drawable, we can
 185     ** initialize the drawable information if has not been done before.
 186     */
 187
 188     if (!psp->dri2.enabled) {
 189         if (!pdp->pStamp || *pdp->pStamp != pdp->lastStamp) {
 190             DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 191             __driUtilUpdateDrawableInfo(pdp);
 192             DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 193         }
 194
 195         if ((pdp != prp) && (!prp->pStamp || *prp->pStamp != prp->lastStamp)) {
 196             DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 197             __driUtilUpdateDrawableInfo(prp);
 198             DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 199         }
 200     }
 201
 202     /* Call device-specific MakeCurrent */
 203     (*psp->DriverAPI.MakeCurrent)(pcp, pdp, prp);
 204
 205     return GL_TRUE;
 206 }
 207
 208 /*@}*/
 209
 210
 211 /*****************************************************************/
 212 /** \name Drawable handling functions                            */
 213 /*****************************************************************/
 214 /*@{*/
 215
 216 /**
 217  * Update private drawable information.
 218  *
 219  * \param pdp pointer to the private drawable information to update.
 220  *
 221  * This function basically updates the __DRIdrawablePrivate struct's
 222  * cliprect information by calling \c __DRIinterfaceMethods::getDrawableInfo.
 223  * This is usually called by the DRI_VALIDATE_DRAWABLE_INFO macro which
 224  * compares the __DRIdrwablePrivate pStamp and lastStamp values.  If
 225  * the values are different that means we have to update the clipping
 226  * info.
 227  */
 228 void
 229 __driUtilUpdateDrawableInfo(__DRIdrawablePrivate *pdp)
 230 {
 231     __DRIscreenPrivate *psp = pdp->driScreenPriv;
 232     __DRIcontextPrivate *pcp = pdp->driContextPriv;
 233
 234     if (!pcp
 235         || ((pdp != pcp->driDrawablePriv) && (pdp != pcp->driReadablePriv))) {
 236         /* ERROR!!!
 237          * ...but we must ignore it. There can be many contexts bound to a
 238          * drawable.
 239          */
 240     }
 241
 242     if (pdp->pClipRects) {
 243         _mesa_free(pdp->pClipRects);
 244         pdp->pClipRects = NULL;
 245     }
 246
 247     if (pdp->pBackClipRects) {
 248         _mesa_free(pdp->pBackClipRects);
 249         pdp->pBackClipRects = NULL;
 250     }
 251
 252     DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 253
 254     if (! (*psp->getDrawableInfo->getDrawableInfo)(pdp,
 255                           &pdp->index, &pdp->lastStamp,
 256                           &pdp->x, &pdp->y, &pdp->w, &pdp->h,
 257                           &pdp->numClipRects, &pdp->pClipRects,
 258                           &pdp->backX,
 259                           &pdp->backY,
 260                           &pdp->numBackClipRects,
 261                           &pdp->pBackClipRects,
 262                           pdp->loaderPrivate)) {
 263         /* Error -- eg the window may have been destroyed.  Keep going
 264          * with no cliprects.
 265          */
 266         pdp->pStamp = &pdp->lastStamp; /* prevent endless loop */
 267         pdp->numClipRects = 0;
 268         pdp->pClipRects = NULL;
 269         pdp->numBackClipRects = 0;
 270         pdp->pBackClipRects = NULL;
 271     }
 272     else
 273        pdp->pStamp = &(psp->pSAREA->drawableTable[pdp->index].stamp);
 274
 275     DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 276 }
 277
 278 /*@}*/
 279
 280 /*****************************************************************/
 281 /** \name GLX callbacks                                          */
 282 /*****************************************************************/
 283 /*@{*/
 284
 285 static void driReportDamage(__DRIdrawable *pdp,
 286                             struct drm_clip_rect *pClipRects, int numClipRects)
 287 {
 288     __DRIscreen *psp = pdp->driScreenPriv;
 289
 290     /* Check that we actually have the new damage report method */
 291     if (psp->damage) {
 292         /* Report the damage.  Currently, all our drivers draw
 293          * directly to the front buffer, so we report the damage there
 294          * rather than to the backing storein (if any).
 295          */
 296         (*psp->damage->reportDamage)(pdp,
 297                                      pdp->x, pdp->y,
 298                                      pClipRects, numClipRects,
 299                                      GL_TRUE, pdp->loaderPrivate);
 300     }
 301 }
 302
 303
 304 /**
 305  * Swap buffers.
 306  *
 307  * \param drawablePrivate opaque pointer to the per-drawable private info.
 308  *
 309  * \internal
 310  * This function calls __DRIdrawablePrivate::swapBuffers.
 311  *
 312  * Is called directly from glXSwapBuffers().
 313  */
 314 static void driSwapBuffers(__DRIdrawable *dPriv)
 315 {
 316     __DRIscreen *psp = dPriv->driScreenPriv;
 317
 318     if (!dPriv->numClipRects)
 319         return;
 320
 321     psp->DriverAPI.SwapBuffers(dPriv);
 322
 323     driReportDamage(dPriv, dPriv->pClipRects, dPriv->numClipRects);
 324 }
 325
 326 static int driDrawableGetMSC( __DRIscreen *sPriv, __DRIdrawable *dPriv,
 327                               int64_t *msc )
 328 {
 329     return sPriv->DriverAPI.GetDrawableMSC(sPriv, dPriv, msc);
 330 }
 331
 332
 333 static int driWaitForMSC(__DRIdrawable *dPriv, int64_t target_msc,
 334                          int64_t divisor, int64_t remainder,
 335                          int64_t * msc, int64_t * sbc)
 336 {
 337     __DRIswapInfo  sInfo;
 338     int  status;
 339
 340     status = dPriv->driScreenPriv->DriverAPI.WaitForMSC( dPriv, target_msc,
 341                                                          divisor, remainder,
 342                                                          msc );
 343
 344     /* GetSwapInfo() may not be provided by the driver if GLX_SGI_video_sync
 345      * is supported but GLX_OML_sync_control is not.  Therefore, don't return
 346      * an error value if GetSwapInfo() is not implemented.
 347     */
 348     if ( status == 0
 349          && dPriv->driScreenPriv->DriverAPI.GetSwapInfo ) {
 350         status = dPriv->driScreenPriv->DriverAPI.GetSwapInfo( dPriv, & sInfo );
 351         *sbc = sInfo.swap_count;
 352     }
 353
 354     return status;
 355 }
 356
 357
 358 const __DRImediaStreamCounterExtension driMediaStreamCounterExtension = {
 359     { __DRI_MEDIA_STREAM_COUNTER, __DRI_MEDIA_STREAM_COUNTER_VERSION },
 360     driWaitForMSC,
 361     driDrawableGetMSC,
 362 };
 363
 364
 365 static void driCopySubBuffer(__DRIdrawable *dPriv,
 366                               int x, int y, int w, int h)
 367 {
 368     drm_clip_rect_t rect;
 369
 370     rect.x1 = x;
 371     rect.y1 = dPriv->h - y - h;
 372     rect.x2 = x + w;
 373     rect.y2 = rect.y1 + h;
 374     driReportDamage(dPriv, &rect, 1);
 375
 376     dPriv->driScreenPriv->DriverAPI.CopySubBuffer(dPriv, x, y, w, h);
 377 }
 378
 379 const __DRIcopySubBufferExtension driCopySubBufferExtension = {
 380     { __DRI_COPY_SUB_BUFFER, __DRI_COPY_SUB_BUFFER_VERSION },
 381     driCopySubBuffer
 382 };
 383
 384 static void driSetSwapInterval(__DRIdrawable *dPriv, unsigned int interval)
 385 {
 386     dPriv->swap_interval = interval;
 387 }
 388
 389 static unsigned int driGetSwapInterval(__DRIdrawable *dPriv)
 390 {
 391     return dPriv->swap_interval;
 392 }
 393
 394 const __DRIswapControlExtension driSwapControlExtension = {
 395     { __DRI_SWAP_CONTROL, __DRI_SWAP_CONTROL_VERSION },
 396     driSetSwapInterval,
 397     driGetSwapInterval
 398 };
 399
 400
 401 /**
 402  * This is called via __DRIscreenRec's createNewDrawable pointer.
 403  */
 404 static __DRIdrawable *
 405 driCreateNewDrawable(__DRIscreen *psp, const __DRIconfig *config,
 406                      drm_drawable_t hwDrawable, int renderType,
 407                      const int *attrs, void *data)
 408 {
 409     __DRIdrawable *pdp;
 410
 411     /* Since pbuffers are not yet supported, no drawable attributes are
 412      * supported either.
 413      */
 414     (void) attrs;
 415
 416     pdp = _mesa_malloc(sizeof *pdp);
 417     if (!pdp) {
 418         return NULL;
 419     }
 420
 421     pdp->loaderPrivate = data;
 422     pdp->hHWDrawable = hwDrawable;
 423     pdp->refcount = 0;
 424     pdp->pStamp = NULL;
 425     pdp->lastStamp = 0;
 426     pdp->index = 0;
 427     pdp->x = 0;
 428     pdp->y = 0;
 429     pdp->w = 0;
 430     pdp->h = 0;
 431     pdp->numClipRects = 0;
 432     pdp->numBackClipRects = 0;
 433     pdp->pClipRects = NULL;
 434     pdp->pBackClipRects = NULL;
 435     pdp->vblSeq = 0;
 436     pdp->vblFlags = 0;
 437
 438     pdp->driScreenPriv = psp;
 439     pdp->driContextPriv = &psp->dummyContextPriv;
 440
 441     if (!(*psp->DriverAPI.CreateBuffer)(psp, pdp, &config->modes,
 442                                         renderType == GLX_PIXMAP_BIT)) {
 443        _mesa_free(pdp);
 444        return NULL;
 445     }
 446
 447     pdp->msc_base = 0;
 448
 449     /* This special default value is replaced with the configured
 450      * default value when the drawable is first bound to a direct
 451      * rendering context.
 452      */
 453     pdp->swap_interval = (unsigned)-1;
 454
 455     return pdp;
 456 }
 457
 458
 459 static __DRIdrawable *
 460 dri2CreateNewDrawable(__DRIscreen *screen,
 461                       const __DRIconfig *config,
 462                       void *loaderPrivate)
 463 {
 464     __DRIdrawable *pdraw;
 465
 466     pdraw = driCreateNewDrawable(screen, config, 0, 0, NULL, loaderPrivate);
 467     if (!pdraw)
 468         return NULL;
 469
 470     pdraw->pClipRects = _mesa_malloc(sizeof *pdraw->pBackClipRects);
 471     pdraw->pBackClipRects = _mesa_malloc(sizeof *pdraw->pBackClipRects);
 472
 473     return pdraw;
 474 }
 475
 476
 477 static void
 478 driDestroyDrawable(__DRIdrawable *pdp)
 479 {
 480     __DRIscreenPrivate *psp;
 481
 482     if (pdp) {
 483         psp = pdp->driScreenPriv;
 484         (*psp->DriverAPI.DestroyBuffer)(pdp);
 485         if (pdp->pClipRects) {
 486             _mesa_free(pdp->pClipRects);
 487             pdp->pClipRects = NULL;
 488         }
 489         if (pdp->pBackClipRects) {
 490             _mesa_free(pdp->pBackClipRects);
 491             pdp->pBackClipRects = NULL;
 492         }
 493         _mesa_free(pdp);
 494     }
 495 }
 496
 497 /*@}*/
 498
 499
 500 /*****************************************************************/
 501 /** \name Context handling functions                             */
 502 /*****************************************************************/
 503 /*@{*/
 504
 505 /**
 506  * Destroy the per-context private information.
 507  *
 508  * \internal
 509  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
 510  * drmDestroyContext(), and finally frees \p contextPrivate.
 511  */
 512 static void
 513 driDestroyContext(__DRIcontext *pcp)
 514 {
 515     if (pcp) {
 516         (*pcp->driScreenPriv->DriverAPI.DestroyContext)(pcp);
 517         _mesa_free(pcp);
 518     }
 519 }
 520
 521
 522 /**
 523  * Create the per-drawable private driver information.
 524  *
 525  * \param render_type   Type of rendering target.  \c GLX_RGBA is the only
 526  *                      type likely to ever be supported for direct-rendering.
 527  * \param shared        Context with which to share textures, etc. or NULL
 528  *
 529  * \returns An opaque pointer to the per-context private information on
 530  *          success, or \c NULL on failure.
 531  *
 532  * \internal
 533  * This function allocates and fills a __DRIcontextPrivateRec structure.  It
 534  * performs some device independent initialization and passes all the
 535  * relevent information to __DriverAPIRec::CreateContext to create the
 536  * context.
 537  *
 538  */
 539 static __DRIcontext *
 540 driCreateNewContext(__DRIscreen *psp, const __DRIconfig *config,
 541                     int render_type, __DRIcontext *shared,
 542                     drm_context_t hwContext, void *data)
 543 {
 544     __DRIcontext *pcp;
 545     void * const shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 546
 547     pcp = _mesa_malloc(sizeof *pcp);
 548     if (!pcp)
 549         return NULL;
 550
 551     pcp->driScreenPriv = psp;
 552     pcp->driDrawablePriv = NULL;
 553
 554     /* When the first context is created for a screen, initialize a "dummy"
 555      * context.
 556      */
 557
 558     if (!psp->dri2.enabled && !psp->dummyContextPriv.driScreenPriv) {
 559         psp->dummyContextPriv.hHWContext = psp->pSAREA->dummy_context;
 560         psp->dummyContextPriv.driScreenPriv = psp;
 561         psp->dummyContextPriv.driDrawablePriv = NULL;
 562         psp->dummyContextPriv.driverPrivate = NULL;
 563         /* No other fields should be used! */
 564     }
 565
 566     pcp->hHWContext = hwContext;
 567
 568     if ( !(*psp->DriverAPI.CreateContext)(&config->modes, pcp, shareCtx) ) {
 569         _mesa_free(pcp);
 570         return NULL;
 571     }
 572
 573     return pcp;
 574 }
 575
 576
 577 static __DRIcontext *
 578 dri2CreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 579                       __DRIcontext *shared, void *data)
 580 {
 581     return driCreateNewContext(screen, config, 0, shared, 0, data);
 582 }
 583
 584
 585 static int
 586 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
 587 {
 588     return GL_FALSE;
 589 }
 590
 591 /*@}*/
 592
 593
 594 /*****************************************************************/
 595 /** \name Screen handling functions                              */
 596 /*****************************************************************/
 597 /*@{*/
 598
 599 /**
 600  * Destroy the per-screen private information.
 601  *
 602  * \internal
 603  * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
 604  * drmClose(), and finally frees \p screenPrivate.
 605  */
 606 static void driDestroyScreen(__DRIscreen *psp)
 607 {
 608     if (psp) {
 609         /* No interaction with the X-server is possible at this point.  This
 610          * routine is called after XCloseDisplay, so there is no protocol
 611          * stream open to the X-server anymore.
 612          */
 613
 614         if (psp->DriverAPI.DestroyScreen)
 615             (*psp->DriverAPI.DestroyScreen)(psp);
 616
 617         if (!psp->dri2.enabled) {
 618            (void)drmUnmap((drmAddress)psp->pSAREA, SAREA_MAX);
 619            (void)drmUnmap((drmAddress)psp->pFB, psp->fbSize);
 620            (void)drmCloseOnce(psp->fd);
 621         }
 622
 623         _mesa_free(psp);
 624     }
 625 }
 626
 627 static void
 628 setupLoaderExtensions(__DRIscreen *psp,
 629                       const __DRIextension **extensions)
 630 {
 631     int i;
 632
 633     for (i = 0; extensions[i]; i++) {
 634         if (strcmp(extensions[i]->name, __DRI_GET_DRAWABLE_INFO) == 0)
 635             psp->getDrawableInfo = (__DRIgetDrawableInfoExtension *) extensions[i];
 636         if (strcmp(extensions[i]->name, __DRI_DAMAGE) == 0)
 637             psp->damage = (__DRIdamageExtension *) extensions[i];
 638         if (strcmp(extensions[i]->name, __DRI_SYSTEM_TIME) == 0)
 639             psp->systemTime = (__DRIsystemTimeExtension *) extensions[i];
 640         if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
 641             psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
 642     }
 643 }
 644
 645 /**
 646  * This is the bootstrap function for the driver.  libGL supplies all of the
 647  * requisite information about the system, and the driver initializes itself.
 648  * This routine also fills in the linked list pointed to by \c driver_modes
 649  * with the \c __GLcontextModes that the driver can support for windows or
 650  * pbuffers.
 651  *
 652  * For legacy DRI.
 653  *
 654  * \param scrn  Index of the screen
 655  * \param ddx_version Version of the 2D DDX.  This may not be meaningful for
 656  *                    all drivers.
 657  * \param dri_version Version of the "server-side" DRI.
 658  * \param drm_version Version of the kernel DRM.
 659  * \param frame_buffer Data describing the location and layout of the
 660  *                     framebuffer.
 661  * \param pSAREA       Pointer the the SAREA.
 662  * \param fd           Device handle for the DRM.
 663  * \param extensions   ??
 664  * \param driver_modes  Returns modes suppoted by the driver
 665  * \param loaderPrivate  ??
 666  *
 667  * \note There is no need to check the minimum API version in this
 668  * function.  Since the name of this function is versioned, it is
 669  * impossible for a loader that is too old to even load this driver.
 670  */
 671 static __DRIscreen *
 672 driCreateNewScreen(int scrn,
 673                    const __DRIversion *ddx_version,
 674                    const __DRIversion *dri_version,
 675                    const __DRIversion *drm_version,
 676                    const __DRIframebuffer *frame_buffer,
 677                    drmAddress pSAREA, int fd,
 678                    const __DRIextension **extensions,
 679                    const __DRIconfig ***driver_modes,
 680                    void *loaderPrivate)
 681 {
 682     static const __DRIextension *emptyExtensionList[] = { NULL };
 683     __DRIscreen *psp;
 684
 685     psp = _mesa_malloc(sizeof *psp);
 686     if (!psp)
 687         return NULL;
 688
 689     setupLoaderExtensions(psp, extensions);
 690
 691     /*
 692     ** NOT_DONE: This is used by the X server to detect when the client
 693     ** has died while holding the drawable lock.  The client sets the
 694     ** drawable lock to this value.
 695     */
 696     psp->drawLockID = 1;
 697
 698     psp->drm_version = *drm_version;
 699     psp->ddx_version = *ddx_version;
 700     psp->dri_version = *dri_version;
 701
 702     psp->pSAREA = pSAREA;
 703     psp->lock = (drmLock *) &psp->pSAREA->lock;
 704
 705     psp->pFB = frame_buffer->base;
 706     psp->fbSize = frame_buffer->size;
 707     psp->fbStride = frame_buffer->stride;
 708     psp->fbWidth = frame_buffer->width;
 709     psp->fbHeight = frame_buffer->height;
 710     psp->devPrivSize = frame_buffer->dev_priv_size;
 711     psp->pDevPriv = frame_buffer->dev_priv;
 712     psp->fbBPP = psp->fbStride * 8 / frame_buffer->width;
 713
 714     psp->extensions = emptyExtensionList;
 715     psp->fd = fd;
 716     psp->myNum = scrn;
 717     psp->dri2.enabled = GL_FALSE;
 718
 719     /*
 720     ** Do not init dummy context here; actual initialization will be
 721     ** done when the first DRI context is created.  Init screen priv ptr
 722     ** to NULL to let CreateContext routine that it needs to be inited.
 723     */
 724     psp->dummyContextPriv.driScreenPriv = NULL;
 725
 726     psp->DriverAPI = driDriverAPI;
 727
 728     *driver_modes = driDriverAPI.InitScreen(psp);
 729     if (*driver_modes == NULL) {
 730         _mesa_free(psp);
 731         return NULL;
 732     }
 733
 734     return psp;
 735 }
 736
 737 /**
 738  * DRI2
 739  */
 740 static __DRIscreen *
 741 dri2CreateNewScreen(int scrn, int fd,
 742                     const __DRIextension **extensions,
 743                     const __DRIconfig ***driver_configs, void *data)
 744 {
 745     static const __DRIextension *emptyExtensionList[] = { NULL };
 746     __DRIscreen *psp;
 747     drmVersionPtr version;
 748
 749     if (driDriverAPI.InitScreen2 == NULL)
 750         return NULL;
 751
 752     psp = _mesa_malloc(sizeof(*psp));
 753     if (!psp)
 754         return NULL;
 755
 756     setupLoaderExtensions(psp, extensions);
 757
 758     version = drmGetVersion(fd);
 759     if (version) {
 760         psp->drm_version.major = version->version_major;
 761         psp->drm_version.minor = version->version_minor;
 762         psp->drm_version.patch = version->version_patchlevel;
 763         drmFreeVersion(version);
 764     }
 765
 766     psp->extensions = emptyExtensionList;
 767     psp->fd = fd;
 768     psp->myNum = scrn;
 769     psp->dri2.enabled = GL_TRUE;
 770
 771     psp->DriverAPI = driDriverAPI;
 772     *driver_configs = driDriverAPI.InitScreen2(psp);
 773     if (*driver_configs == NULL) {
 774         _mesa_free(psp);
 775         return NULL;
 776     }
 777
 778     psp->DriverAPI = driDriverAPI;
 779
 780     return psp;
 781 }
 782
 783 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 784 {
 785     return psp->extensions;
 786 }
 787
 788 /** Core interface */
 789 const __DRIcoreExtension driCoreExtension = {
 790     { __DRI_CORE, __DRI_CORE_VERSION },
 791     NULL,
 792     driDestroyScreen,
 793     driGetExtensions,
 794     driGetConfigAttrib,
 795     driIndexConfigAttrib,
 796     NULL,
 797     driDestroyDrawable,
 798     driSwapBuffers,
 799     NULL,
 800     driCopyContext,
 801     driDestroyContext,
 802     driBindContext,
 803     driUnbindContext
 804 };
 805
 806 /** Legacy DRI interface */
 807 const __DRIlegacyExtension driLegacyExtension = {
 808     { __DRI_LEGACY, __DRI_LEGACY_VERSION },
 809     driCreateNewScreen,
 810     driCreateNewDrawable,
 811     driCreateNewContext,
 812 };
 813
 814 /** Legacy DRI interface */
 815 const __DRIdri2Extension driDRI2Extension = {
 816     { __DRI_DRI2, __DRI_DRI2_VERSION },
 817     dri2CreateNewScreen,
 818     dri2CreateNewDrawable,
 819     dri2CreateNewContext,
 820 };
 821
 822 /* This is the table of extensions that the loader will dlsym() for. */
 823 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 824     &driCoreExtension.base,
 825     &driLegacyExtension.base,
 826     &driDRI2Extension.base,
 827     NULL
 828 };
 829
 830 static int
 831 driFrameTracking(__DRIdrawable *drawable, GLboolean enable)
 832 {
 833     return GLX_BAD_CONTEXT;
 834 }
 835
 836 static int
 837 driQueryFrameTracking(__DRIdrawable *dpriv,
 838                       int64_t * sbc, int64_t * missedFrames,
 839                       float * lastMissedUsage, float * usage)
 840 {
 841    __DRIswapInfo   sInfo;
 842    int             status;
 843    int64_t         ust;
 844    __DRIscreenPrivate *psp = dpriv->driScreenPriv;
 845
 846    status = dpriv->driScreenPriv->DriverAPI.GetSwapInfo( dpriv, & sInfo );
 847    if ( status == 0 ) {
 848       *sbc = sInfo.swap_count;
 849       *missedFrames = sInfo.swap_missed_count;
 850       *lastMissedUsage = sInfo.swap_missed_usage;
 851
 852       (*psp->systemTime->getUST)( & ust );
 853       *usage = driCalculateSwapUsage( dpriv, sInfo.swap_ust, ust );
 854    }
 855
 856    return status;
 857 }
 858
 859 const __DRIframeTrackingExtension driFrameTrackingExtension = {
 860     { __DRI_FRAME_TRACKING, __DRI_FRAME_TRACKING_VERSION },
 861     driFrameTracking,
 862     driQueryFrameTracking
 863 };
 864
 865 /**
 866  * Calculate amount of swap interval used between GLX buffer swaps.
 867  *
 868  * The usage value, on the range [0,max], is the fraction of total swap
 869  * interval time used between GLX buffer swaps is calculated.
 870  *
 871  *            \f$p = t_d / (i * t_r)\f$
 872  *
 873  * Where \f$t_d\f$ is the time since the last GLX buffer swap, \f$i\f$ is the
 874  * swap interval (as set by \c glXSwapIntervalSGI), and \f$t_r\f$ time
 875  * required for a single vertical refresh period (as returned by \c
 876  * glXGetMscRateOML).
 877  *
 878  * See the documentation for the GLX_MESA_swap_frame_usage extension for more
 879  * details.
 880  *
 881  * \param   dPriv  Pointer to the private drawable structure.
 882  * \return  If less than a single swap interval time period was required
 883  *          between GLX buffer swaps, a number greater than 0 and less than
 884  *          1.0 is returned.  If exactly one swap interval time period is
 885  *          required, 1.0 is returned, and if more than one is required then
 886  *          a number greater than 1.0 will be returned.
 887  *
 888  * \sa glXSwapIntervalSGI glXGetMscRateOML
 889  *
 890  * \todo Instead of caching the \c glXGetMscRateOML function pointer, would it
 891  *       be possible to cache the sync rate?
 892  */
 893 float
 894 driCalculateSwapUsage( __DRIdrawablePrivate *dPriv, int64_t last_swap_ust,
 895                        int64_t current_ust )
 896 {
 897    int32_t   n;
 898    int32_t   d;
 899    int       interval;
 900    float     usage = 1.0;
 901    __DRIscreenPrivate *psp = dPriv->driScreenPriv;
 902
 903    if ( (*psp->systemTime->getMSCRate)(dPriv, &n, &d, dPriv->loaderPrivate) ) {
 904       interval = (dPriv->swap_interval != 0) ? dPriv->swap_interval : 1;
 905
 906
 907       /* We want to calculate
 908        * (current_UST - last_swap_UST) / (interval * us_per_refresh).  We get
 909        * current_UST by calling __glXGetUST.  last_swap_UST is stored in
 910        * dPriv->swap_ust.  interval has already been calculated.
 911        *
 912        * The only tricky part is us_per_refresh.  us_per_refresh is
 913        * 1000000 / MSC_rate.  We know the MSC_rate is n / d.  We can flip it
 914        * around and say us_per_refresh = 1000000 * d / n.  Since this goes in
 915        * the denominator of the final calculation, we calculate
 916        * (interval * 1000000 * d) and move n into the numerator.
 917        */
 918
 919       usage = (current_ust - last_swap_ust);
 920       usage *= n;
 921       usage /= (interval * d);
 922       usage /= 1000000.0;
 923    }
 924
 925    return usage;
 926 }
 927
 928 /*@}*/