1 /* $XFree86: xc/lib/GL/dri/dri_util.c,v 1.7 2003/04/28 17:01:25 dawes Exp $ */
4 * DRI utility functions.
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
11 * Basically, these utility functions take care of some of the dirty details of
12 * screen initialization, context creation, context binding, DRM setup, etc.
14 * These functions are compiled into each DRI driver so libGL.so knows nothing
26 #define MAP_FAILED ((void *)-1)
33 #include "drm_sarea.h"
36 #ifndef GLX_OML_sync_control
37 typedef GLboolean ( * PFNGLXGETMSCRATEOMLPROC) (__DRIdrawable *drawable, int32_t *numerator, int32_t *denominator);
41 * This is just a token extension used to signal that the driver
42 * supports setting a read drawable.
44 const __DRIextension driReadDrawableExtension = {
45 __DRI_READ_DRAWABLE, __DRI_READ_DRAWABLE_VERSION
49 * Print message to \c stderr if the \c LIBGL_DEBUG environment variable
52 * Is called from the drivers.
54 * \param f \c printf like format string.
57 __driUtilMessage(const char *f, ...)
61 if (getenv("LIBGL_DEBUG")) {
62 fprintf(stderr, "libGL error: \n");
64 vfprintf(stderr, f, args);
66 fprintf(stderr, "\n");
71 driIntersectArea( drm_clip_rect_t rect1, drm_clip_rect_t rect2 )
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;
78 if (rect1.x1 > rect1.x2 || rect1.y1 > rect1.y2) return 0;
80 return (rect1.x2 - rect1.x1) * (rect1.y2 - rect1.y1);
83 /*****************************************************************/
84 /** \name Context (un)binding functions */
85 /*****************************************************************/
91 * \param scrn the screen.
94 * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
97 * This function calls __DriverAPIRec::UnbindContext, and then decrements
98 * __DRIdrawablePrivateRec::refcount which must be non-zero for a successful
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.
104 static int driUnbindContext(__DRIcontext *pcp)
111 ** Assume error checking is done properly in glXMakeCurrent before
112 ** calling driUnbindContext.
118 psp = pcp->driScreenPriv;
119 pdp = pcp->driDrawablePriv;
120 prp = pcp->driReadablePriv;
122 /* Let driver unbind drawable from context */
123 (*psp->DriverAPI.UnbindContext)(pcp);
125 if (pdp->refcount == 0) {
133 if (prp->refcount == 0) {
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)
147 /* Unbind the drawable */
148 pcp->driDrawablePriv = NULL;
149 pdp->driContextPriv = &psp->dummyContextPriv;
157 * This function takes both a read buffer and a draw buffer. This is needed
158 * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
161 static int driBindContext(__DRIcontext *pcp,
165 __DRIscreenPrivate *psp = pcp->driScreenPriv;
168 ** Assume error checking is done properly in glXMakeCurrent before
169 ** calling driBindContext.
172 if (pcp == NULL || pdp == None || prp == None)
175 /* Bind the drawable to the context */
176 pcp->driDrawablePriv = pdp;
177 pcp->driReadablePriv = prp;
178 pdp->driContextPriv = pcp;
185 ** Now that we have a context associated with this drawable, we can
186 ** initialize the drawable information if has not been done before.
189 if (psp->dri2.enabled) {
190 __driParseEvents(pcp, pdp);
191 __driParseEvents(pcp, prp);
193 if (!pdp->pStamp || *pdp->pStamp != pdp->lastStamp) {
194 DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
195 __driUtilUpdateDrawableInfo(pdp);
196 DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
199 if ((pdp != prp) && (!prp->pStamp || *prp->pStamp != prp->lastStamp)) {
200 DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
201 __driUtilUpdateDrawableInfo(prp);
202 DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
206 /* Call device-specific MakeCurrent */
207 (*psp->DriverAPI.MakeCurrent)(pcp, pdp, prp);
215 /*****************************************************************/
216 /** \name Drawable handling functions */
217 /*****************************************************************/
221 * Update private drawable information.
223 * \param pdp pointer to the private drawable information to update.
225 * This function basically updates the __DRIdrawablePrivate struct's
226 * cliprect information by calling \c __DRIinterfaceMethods::getDrawableInfo.
227 * This is usually called by the DRI_VALIDATE_DRAWABLE_INFO macro which
228 * compares the __DRIdrwablePrivate pStamp and lastStamp values. If
229 * the values are different that means we have to update the clipping
233 __driUtilUpdateDrawableInfo(__DRIdrawablePrivate *pdp)
235 __DRIscreenPrivate *psp = pdp->driScreenPriv;
236 __DRIcontextPrivate *pcp = pdp->driContextPriv;
239 || ((pdp != pcp->driDrawablePriv) && (pdp != pcp->driReadablePriv))) {
241 * ...but we must ignore it. There can be many contexts bound to a
246 if (pdp->pClipRects) {
247 _mesa_free(pdp->pClipRects);
248 pdp->pClipRects = NULL;
251 if (pdp->pBackClipRects) {
252 _mesa_free(pdp->pBackClipRects);
253 pdp->pBackClipRects = NULL;
256 DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
258 if (! (*psp->getDrawableInfo->getDrawableInfo)(pdp,
259 &pdp->index, &pdp->lastStamp,
260 &pdp->x, &pdp->y, &pdp->w, &pdp->h,
261 &pdp->numClipRects, &pdp->pClipRects,
264 &pdp->numBackClipRects,
265 &pdp->pBackClipRects,
266 pdp->loaderPrivate)) {
267 /* Error -- eg the window may have been destroyed. Keep going
270 pdp->pStamp = &pdp->lastStamp; /* prevent endless loop */
271 pdp->numClipRects = 0;
272 pdp->pClipRects = NULL;
273 pdp->numBackClipRects = 0;
274 pdp->pBackClipRects = NULL;
277 pdp->pStamp = &(psp->pSAREA->drawableTable[pdp->index].stamp);
279 DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
284 __driParseEvents(__DRIcontextPrivate *pcp, __DRIdrawablePrivate *pdp)
286 __DRIscreenPrivate *psp = pdp->driScreenPriv;
287 __DRIDrawableConfigEvent *dc, *last_dc;
288 __DRIBufferAttachEvent *ba, *last_ba;
289 unsigned int tail, mask, *p, end, total, size, changed;
293 /* Check for wraparound. */
294 if (pcp && psp->dri2.buffer->prealloc - pdp->dri2.tail > psp->dri2.buffer->size) {
295 /* If prealloc overlaps into what we just parsed, the
296 * server overwrote it and we have to reset our tail
298 DRM_UNLOCK(psp->fd, psp->lock, pcp->hHWContext);
299 (*psp->dri2.loader->reemitDrawableInfo)(pdp, &pdp->dri2.tail,
301 DRM_LIGHT_LOCK(psp->fd, psp->lock, pcp->hHWContext);
304 total = psp->dri2.buffer->head - pdp->dri2.tail;
305 mask = psp->dri2.buffer->size - 1;
306 end = psp->dri2.buffer->head;
307 data = psp->dri2.buffer->data;
313 for (tail = pdp->dri2.tail; tail != end; tail += size) {
314 p = (unsigned int *) (data + (tail & mask));
315 size = DRI2_EVENT_SIZE(*p);
316 if (size > total || (tail & mask) + size > psp->dri2.buffer->size) {
317 /* illegal data, bail out. */
318 fprintf(stderr, "illegal event size\n");
322 switch (DRI2_EVENT_TYPE(*p)) {
323 case DRI2_EVENT_DRAWABLE_CONFIG:
324 dc = (__DRIDrawableConfigEvent *) p;
325 if (dc->drawable == pdp->dri2.drawable_id)
329 case DRI2_EVENT_BUFFER_ATTACH:
330 ba = (__DRIBufferAttachEvent *) p;
331 if (ba->drawable == pdp->dri2.drawable_id &&
332 ba->buffer.attachment == DRI_DRAWABLE_BUFFER_FRONT_LEFT)
339 if (pdp->w != last_dc->width || pdp->h != last_dc->height)
344 pdp->w = last_dc->width;
345 pdp->h = last_dc->height;
349 pdp->numBackClipRects = 1;
350 pdp->pBackClipRects[0].x1 = 0;
351 pdp->pBackClipRects[0].y1 = 0;
352 pdp->pBackClipRects[0].x2 = pdp->w;
353 pdp->pBackClipRects[0].y2 = pdp->h;
355 pdp->numClipRects = last_dc->num_rects;
356 _mesa_free(pdp->pClipRects);
357 rect_size = last_dc->num_rects * sizeof last_dc->rects[0];
358 pdp->pClipRects = _mesa_malloc(rect_size);
359 memcpy(pdp->pClipRects, last_dc->rects, rect_size);
362 /* We only care about the most recent drawable config. */
363 if (last_dc && changed)
364 (*psp->DriverAPI.HandleDrawableConfig)(pdp, pcp, last_dc);
366 /* Front buffer attachments are special, they typically mean that
367 * we're rendering to a redirected window (or a child window of a
368 * redirected window) and that it got resized. Resizing the root
369 * window on randr events is a special case of this. Other causes
370 * may be a window transitioning between redirected and
371 * non-redirected, or a window getting reparented between parents
372 * with different window pixmaps (eg two redirected windows).
373 * These events are special in that the X server allocates the
374 * buffer and that the buffer may be shared by other child
375 * windows. When our window share the window pixmap with its
376 * parent, drawable config events doesn't affect the front buffer.
377 * We only care about the last such event in the buffer; in fact,
378 * older events will refer to invalid buffer objects.*/
380 (*psp->DriverAPI.HandleBufferAttach)(pdp, pcp, last_ba);
382 /* If there was a drawable config event in the buffer and it
383 * changed the size of the window, all buffer auxillary buffer
384 * attachments prior to that are invalid (as opposed to the front
385 * buffer case discussed above). In that case we can start
386 * looking for buffer attachment after the last drawable config
387 * event. If there is no drawable config event in this batch of
388 * events, we have to assume that the last batch might have had
389 * one and process all buffer attach events.*/
390 if (last_dc && changed)
391 tail = (unsigned char *) last_dc - data;
393 tail = pdp->dri2.tail;
395 for ( ; tail != end; tail += size) {
396 ba = (__DRIBufferAttachEvent *) (data + (tail & mask));
397 size = DRI2_EVENT_SIZE(ba->event_header);
399 if (DRI2_EVENT_TYPE(ba->event_header) != DRI2_EVENT_BUFFER_ATTACH)
401 if (ba->drawable != pdp->dri2.drawable_id)
406 (*psp->DriverAPI.HandleBufferAttach)(pdp, pcp, ba);
410 pdp->dri2.tail = tail;
412 return changed || last_ba;
417 /*****************************************************************/
418 /** \name GLX callbacks */
419 /*****************************************************************/
422 static void driReportDamage(__DRIdrawable *pdp,
423 struct drm_clip_rect *pClipRects, int numClipRects)
425 __DRIscreen *psp = pdp->driScreenPriv;
427 /* Check that we actually have the new damage report method */
428 if (psp->dri2.enabled) {
429 (*psp->dri2.loader->postDamage)(pdp,
433 } else if (psp->damage) {
434 /* Report the damage. Currently, all our drivers draw
435 * directly to the front buffer, so we report the damage there
436 * rather than to the backing storein (if any).
438 (*psp->damage->reportDamage)(pdp,
440 pClipRects, numClipRects,
441 GL_TRUE, pdp->loaderPrivate);
449 * \param drawablePrivate opaque pointer to the per-drawable private info.
452 * This function calls __DRIdrawablePrivate::swapBuffers.
454 * Is called directly from glXSwapBuffers().
456 static void driSwapBuffers(__DRIdrawable *dPriv)
458 __DRIscreen *psp = dPriv->driScreenPriv;
460 if (!dPriv->numClipRects)
463 if (psp->dri2.enabled)
464 __driParseEvents(NULL, dPriv);
466 psp->DriverAPI.SwapBuffers(dPriv);
468 driReportDamage(dPriv, dPriv->pClipRects, dPriv->numClipRects);
471 static int driDrawableGetMSC( __DRIscreen *sPriv, __DRIdrawable *dPriv,
474 return sPriv->DriverAPI.GetDrawableMSC(sPriv, dPriv, msc);
478 static int driWaitForMSC(__DRIdrawable *dPriv, int64_t target_msc,
479 int64_t divisor, int64_t remainder,
480 int64_t * msc, int64_t * sbc)
485 status = dPriv->driScreenPriv->DriverAPI.WaitForMSC( dPriv, target_msc,
489 /* GetSwapInfo() may not be provided by the driver if GLX_SGI_video_sync
490 * is supported but GLX_OML_sync_control is not. Therefore, don't return
491 * an error value if GetSwapInfo() is not implemented.
494 && dPriv->driScreenPriv->DriverAPI.GetSwapInfo ) {
495 status = dPriv->driScreenPriv->DriverAPI.GetSwapInfo( dPriv, & sInfo );
496 *sbc = sInfo.swap_count;
503 const __DRImediaStreamCounterExtension driMediaStreamCounterExtension = {
504 { __DRI_MEDIA_STREAM_COUNTER, __DRI_MEDIA_STREAM_COUNTER_VERSION },
510 static void driCopySubBuffer(__DRIdrawable *dPriv,
511 int x, int y, int w, int h)
513 drm_clip_rect_t rect;
515 dPriv->driScreenPriv->DriverAPI.CopySubBuffer(dPriv, x, y, w, h);
518 rect.y1 = dPriv->h - y - h;
520 rect.y2 = rect.y1 + h;
521 driReportDamage(dPriv, &rect, 1);
524 const __DRIcopySubBufferExtension driCopySubBufferExtension = {
525 { __DRI_COPY_SUB_BUFFER, __DRI_COPY_SUB_BUFFER_VERSION },
529 static void driSetSwapInterval(__DRIdrawable *dPriv, unsigned int interval)
531 dPriv->swap_interval = interval;
534 static unsigned int driGetSwapInterval(__DRIdrawable *dPriv)
536 return dPriv->swap_interval;
539 const __DRIswapControlExtension driSwapControlExtension = {
540 { __DRI_SWAP_CONTROL, __DRI_SWAP_CONTROL_VERSION },
547 * This is called via __DRIscreenRec's createNewDrawable pointer.
549 static __DRIdrawable *
550 driCreateNewDrawable(__DRIscreen *psp, const __DRIconfig *config,
551 drm_drawable_t hwDrawable, int renderType,
552 const int *attrs, void *data)
556 /* Since pbuffers are not yet supported, no drawable attributes are
561 pdp = _mesa_malloc(sizeof *pdp);
566 pdp->loaderPrivate = data;
567 pdp->hHWDrawable = hwDrawable;
576 pdp->numClipRects = 0;
577 pdp->numBackClipRects = 0;
578 pdp->pClipRects = NULL;
579 pdp->pBackClipRects = NULL;
583 pdp->driScreenPriv = psp;
584 pdp->driContextPriv = &psp->dummyContextPriv;
586 if (!(*psp->DriverAPI.CreateBuffer)(psp, pdp, &config->modes,
587 renderType == GLX_PIXMAP_BIT)) {
594 /* This special default value is replaced with the configured
595 * default value when the drawable is first bound to a direct
598 pdp->swap_interval = (unsigned)-1;
604 static __DRIdrawable *
605 dri2CreateNewDrawable(__DRIscreen *screen, const __DRIconfig *config,
606 unsigned int drawable_id, unsigned int head, void *data)
608 __DRIdrawable *pdraw;
610 pdraw = driCreateNewDrawable(screen, config, 0, 0, NULL, data);
614 pdraw->dri2.drawable_id = drawable_id;
615 pdraw->dri2.tail = head;
616 pdraw->pBackClipRects = _mesa_malloc(sizeof *pdraw->pBackClipRects);
623 driDestroyDrawable(__DRIdrawable *pdp)
625 __DRIscreenPrivate *psp;
628 psp = pdp->driScreenPriv;
629 (*psp->DriverAPI.DestroyBuffer)(pdp);
630 if (pdp->pClipRects) {
631 _mesa_free(pdp->pClipRects);
632 pdp->pClipRects = NULL;
634 if (pdp->pBackClipRects) {
635 _mesa_free(pdp->pBackClipRects);
636 pdp->pBackClipRects = NULL;
645 /*****************************************************************/
646 /** \name Context handling functions */
647 /*****************************************************************/
651 * Destroy the per-context private information.
654 * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
655 * drmDestroyContext(), and finally frees \p contextPrivate.
658 driDestroyContext(__DRIcontext *pcp)
661 (*pcp->driScreenPriv->DriverAPI.DestroyContext)(pcp);
668 * Create the per-drawable private driver information.
670 * \param render_type Type of rendering target. \c GLX_RGBA is the only
671 * type likely to ever be supported for direct-rendering.
672 * \param shared Context with which to share textures, etc. or NULL
674 * \returns An opaque pointer to the per-context private information on
675 * success, or \c NULL on failure.
678 * This function allocates and fills a __DRIcontextPrivateRec structure. It
679 * performs some device independent initialization and passes all the
680 * relevent information to __DriverAPIRec::CreateContext to create the
684 static __DRIcontext *
685 driCreateNewContext(__DRIscreen *psp, const __DRIconfig *config,
686 int render_type, __DRIcontext *shared,
687 drm_context_t hwContext, void *data)
690 void * const shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
692 pcp = _mesa_malloc(sizeof *pcp);
696 pcp->driScreenPriv = psp;
697 pcp->driDrawablePriv = NULL;
699 /* When the first context is created for a screen, initialize a "dummy"
703 if (!psp->dri2.enabled && !psp->dummyContextPriv.driScreenPriv) {
704 psp->dummyContextPriv.hHWContext = psp->pSAREA->dummy_context;
705 psp->dummyContextPriv.driScreenPriv = psp;
706 psp->dummyContextPriv.driDrawablePriv = NULL;
707 psp->dummyContextPriv.driverPrivate = NULL;
708 /* No other fields should be used! */
711 pcp->hHWContext = hwContext;
713 if ( !(*psp->DriverAPI.CreateContext)(&config->modes, pcp, shareCtx) ) {
722 static __DRIcontext *
723 dri2CreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
724 __DRIcontext *shared, void *data)
726 drm_context_t hwContext;
729 /* DRI2 doesn't use kernel with context IDs, we just need an ID that's
730 * different from the kernel context ID to make drmLock() happy. */
733 hwContext = screen->dri2.lock->next_id;
734 DRM_CAS(&screen->dri2.lock->next_id, hwContext, hwContext + 1, ret);
737 return driCreateNewContext(screen, config, 0, shared, hwContext, data);
742 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
750 /*****************************************************************/
751 /** \name Screen handling functions */
752 /*****************************************************************/
756 * Destroy the per-screen private information.
759 * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
760 * drmClose(), and finally frees \p screenPrivate.
762 static void driDestroyScreen(__DRIscreen *psp)
765 /* No interaction with the X-server is possible at this point. This
766 * routine is called after XCloseDisplay, so there is no protocol
767 * stream open to the X-server anymore.
770 if (psp->DriverAPI.DestroyScreen)
771 (*psp->DriverAPI.DestroyScreen)(psp);
773 if (psp->dri2.enabled) {
775 drmBOUnmap(psp->fd, &psp->dri2.sareaBO);
776 drmBOUnreference(psp->fd, &psp->dri2.sareaBO);
779 (void)drmUnmap((drmAddress)psp->pSAREA, SAREA_MAX);
780 (void)drmUnmap((drmAddress)psp->pFB, psp->fbSize);
781 (void)drmCloseOnce(psp->fd);
789 setupLoaderExtensions(__DRIscreen *psp,
790 const __DRIextension **extensions)
794 for (i = 0; extensions[i]; i++) {
795 if (strcmp(extensions[i]->name, __DRI_GET_DRAWABLE_INFO) == 0)
796 psp->getDrawableInfo = (__DRIgetDrawableInfoExtension *) extensions[i];
797 if (strcmp(extensions[i]->name, __DRI_DAMAGE) == 0)
798 psp->damage = (__DRIdamageExtension *) extensions[i];
799 if (strcmp(extensions[i]->name, __DRI_SYSTEM_TIME) == 0)
800 psp->systemTime = (__DRIsystemTimeExtension *) extensions[i];
801 if (strcmp(extensions[i]->name, __DRI_LOADER) == 0)
802 psp->dri2.loader = (__DRIloaderExtension *) extensions[i];
807 * This is the bootstrap function for the driver. libGL supplies all of the
808 * requisite information about the system, and the driver initializes itself.
809 * This routine also fills in the linked list pointed to by \c driver_modes
810 * with the \c __GLcontextModes that the driver can support for windows or
815 * \param scrn Index of the screen
816 * \param ddx_version Version of the 2D DDX. This may not be meaningful for
818 * \param dri_version Version of the "server-side" DRI.
819 * \param drm_version Version of the kernel DRM.
820 * \param frame_buffer Data describing the location and layout of the
822 * \param pSAREA Pointer the the SAREA.
823 * \param fd Device handle for the DRM.
824 * \param extensions ??
825 * \param driver_modes Returns modes suppoted by the driver
826 * \param loaderPrivate ??
828 * \note There is no need to check the minimum API version in this
829 * function. Since the name of this function is versioned, it is
830 * impossible for a loader that is too old to even load this driver.
833 driCreateNewScreen(int scrn,
834 const __DRIversion *ddx_version,
835 const __DRIversion *dri_version,
836 const __DRIversion *drm_version,
837 const __DRIframebuffer *frame_buffer,
838 drmAddress pSAREA, int fd,
839 const __DRIextension **extensions,
840 const __DRIconfig ***driver_modes,
843 static const __DRIextension *emptyExtensionList[] = { NULL };
846 psp = _mesa_malloc(sizeof *psp);
850 setupLoaderExtensions(psp, extensions);
853 ** NOT_DONE: This is used by the X server to detect when the client
854 ** has died while holding the drawable lock. The client sets the
855 ** drawable lock to this value.
859 psp->drm_version = *drm_version;
860 psp->ddx_version = *ddx_version;
861 psp->dri_version = *dri_version;
863 psp->pSAREA = pSAREA;
864 psp->lock = (drmLock *) &psp->pSAREA->lock;
866 psp->pFB = frame_buffer->base;
867 psp->fbSize = frame_buffer->size;
868 psp->fbStride = frame_buffer->stride;
869 psp->fbWidth = frame_buffer->width;
870 psp->fbHeight = frame_buffer->height;
871 psp->devPrivSize = frame_buffer->dev_priv_size;
872 psp->pDevPriv = frame_buffer->dev_priv;
873 psp->fbBPP = psp->fbStride * 8 / frame_buffer->width;
875 psp->extensions = emptyExtensionList;
878 psp->dri2.enabled = GL_FALSE;
881 ** Do not init dummy context here; actual initialization will be
882 ** done when the first DRI context is created. Init screen priv ptr
883 ** to NULL to let CreateContext routine that it needs to be inited.
885 psp->dummyContextPriv.driScreenPriv = NULL;
887 psp->DriverAPI = driDriverAPI;
889 *driver_modes = driDriverAPI.InitScreen(psp);
890 if (*driver_modes == NULL) {
903 dri2CreateNewScreen(int scrn, int fd, unsigned int sarea_handle,
904 const __DRIextension **extensions,
905 const __DRIconfig ***driver_configs, void *data)
908 static const __DRIextension *emptyExtensionList[] = { NULL };
911 drmVersionPtr version;
913 if (driDriverAPI.InitScreen2 == NULL)
916 psp = _mesa_malloc(sizeof(*psp));
920 setupLoaderExtensions(psp, extensions);
922 version = drmGetVersion(fd);
924 psp->drm_version.major = version->version_major;
925 psp->drm_version.minor = version->version_minor;
926 psp->drm_version.patch = version->version_patchlevel;
927 drmFreeVersion(version);
930 psp->extensions = emptyExtensionList;
933 psp->dri2.enabled = GL_TRUE;
935 if (drmBOReference(psp->fd, sarea_handle, &psp->dri2.sareaBO)) {
936 fprintf(stderr, "Failed to reference DRI2 sarea BO\n");
941 if (drmBOMap(psp->fd, &psp->dri2.sareaBO,
942 DRM_BO_FLAG_READ | DRM_BO_FLAG_WRITE, 0, &psp->dri2.sarea)) {
943 drmBOUnreference(psp->fd, &psp->dri2.sareaBO);
949 while (DRI2_SAREA_BLOCK_TYPE(*p)) {
950 switch (DRI2_SAREA_BLOCK_TYPE(*p)) {
951 case DRI2_SAREA_BLOCK_LOCK:
952 psp->dri2.lock = (__DRILock *) p;
954 case DRI2_SAREA_BLOCK_EVENT_BUFFER:
955 psp->dri2.buffer = (__DRIEventBuffer *) p;
958 p = DRI2_SAREA_BLOCK_NEXT(p);
961 psp->lock = (drmLock *) &psp->dri2.lock->lock;
963 psp->DriverAPI = driDriverAPI;
964 *driver_configs = driDriverAPI.InitScreen2(psp);
965 if (*driver_configs == NULL) {
966 drmBOUnmap(psp->fd, &psp->dri2.sareaBO);
967 drmBOUnreference(psp->fd, &psp->dri2.sareaBO);
972 psp->DriverAPI = driDriverAPI;
980 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
982 return psp->extensions;
985 /** Legacy DRI interface */
986 const __DRIlegacyExtension driLegacyExtension = {
987 { __DRI_LEGACY, __DRI_LEGACY_VERSION },
989 driCreateNewDrawable,
993 /** DRI2 interface */
994 const __DRIcoreExtension driCoreExtension = {
995 { __DRI_CORE, __DRI_CORE_VERSION },
1000 driIndexConfigAttrib,
1001 dri2CreateNewDrawable,
1004 dri2CreateNewContext,
1011 /* This is the table of extensions that the loader will dlsym() for. */
1012 PUBLIC const __DRIextension *__driDriverExtensions[] = {
1013 &driCoreExtension.base,
1014 &driLegacyExtension.base,
1019 driFrameTracking(__DRIdrawable *drawable, GLboolean enable)
1021 return GLX_BAD_CONTEXT;
1025 driQueryFrameTracking(__DRIdrawable *dpriv,
1026 int64_t * sbc, int64_t * missedFrames,
1027 float * lastMissedUsage, float * usage)
1029 __DRIswapInfo sInfo;
1032 __DRIscreenPrivate *psp = dpriv->driScreenPriv;
1034 status = dpriv->driScreenPriv->DriverAPI.GetSwapInfo( dpriv, & sInfo );
1035 if ( status == 0 ) {
1036 *sbc = sInfo.swap_count;
1037 *missedFrames = sInfo.swap_missed_count;
1038 *lastMissedUsage = sInfo.swap_missed_usage;
1040 (*psp->systemTime->getUST)( & ust );
1041 *usage = driCalculateSwapUsage( dpriv, sInfo.swap_ust, ust );
1047 const __DRIframeTrackingExtension driFrameTrackingExtension = {
1048 { __DRI_FRAME_TRACKING, __DRI_FRAME_TRACKING_VERSION },
1050 driQueryFrameTracking
1054 * Calculate amount of swap interval used between GLX buffer swaps.
1056 * The usage value, on the range [0,max], is the fraction of total swap
1057 * interval time used between GLX buffer swaps is calculated.
1059 * \f$p = t_d / (i * t_r)\f$
1061 * Where \f$t_d\f$ is the time since the last GLX buffer swap, \f$i\f$ is the
1062 * swap interval (as set by \c glXSwapIntervalSGI), and \f$t_r\f$ time
1063 * required for a single vertical refresh period (as returned by \c
1064 * glXGetMscRateOML).
1066 * See the documentation for the GLX_MESA_swap_frame_usage extension for more
1069 * \param dPriv Pointer to the private drawable structure.
1070 * \return If less than a single swap interval time period was required
1071 * between GLX buffer swaps, a number greater than 0 and less than
1072 * 1.0 is returned. If exactly one swap interval time period is
1073 * required, 1.0 is returned, and if more than one is required then
1074 * a number greater than 1.0 will be returned.
1076 * \sa glXSwapIntervalSGI glXGetMscRateOML
1078 * \todo Instead of caching the \c glXGetMscRateOML function pointer, would it
1079 * be possible to cache the sync rate?
1082 driCalculateSwapUsage( __DRIdrawablePrivate *dPriv, int64_t last_swap_ust,
1083 int64_t current_ust )
1089 __DRIscreenPrivate *psp = dPriv->driScreenPriv;
1091 if ( (*psp->systemTime->getMSCRate)(dPriv, &n, &d, dPriv->loaderPrivate) ) {
1092 interval = (dPriv->swap_interval != 0) ? dPriv->swap_interval : 1;
1095 /* We want to calculate
1096 * (current_UST - last_swap_UST) / (interval * us_per_refresh). We get
1097 * current_UST by calling __glXGetUST. last_swap_UST is stored in
1098 * dPriv->swap_ust. interval has already been calculated.
1100 * The only tricky part is us_per_refresh. us_per_refresh is
1101 * 1000000 / MSC_rate. We know the MSC_rate is n / d. We can flip it
1102 * around and say us_per_refresh = 1000000 * d / n. Since this goes in
1103 * the denominator of the final calculation, we calculate
1104 * (interval * 1000000 * d) and move n into the numerator.
1107 usage = (current_ust - last_swap_ust);
1109 usage /= (interval * d);