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 #include "../glsl/glsl_parser_extras.h"
  36
  37 PUBLIC const char __dri2ConfigOptions[] =
  38    DRI_CONF_BEGIN
  39       DRI_CONF_SECTION_PERFORMANCE
  40          DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_1)
  41       DRI_CONF_SECTION_END
  42    DRI_CONF_END;
  43
  44 static const uint __dri2NConfigOptions = 1;
  45
  46 #ifndef GLX_OML_sync_control
  47 typedef GLboolean ( * PFNGLXGETMSCRATEOMLPROC) (__DRIdrawable *drawable, int32_t *numerator, int32_t *denominator);
  48 #endif
  49
  50 static void dri_get_drawable(__DRIdrawable *pdp);
  51 static void dri_put_drawable(__DRIdrawable *pdp);
  52
  53 GLint
  54 driIntersectArea( drm_clip_rect_t rect1, drm_clip_rect_t rect2 )
  55 {
  56    if (rect2.x1 > rect1.x1) rect1.x1 = rect2.x1;
  57    if (rect2.x2 < rect1.x2) rect1.x2 = rect2.x2;
  58    if (rect2.y1 > rect1.y1) rect1.y1 = rect2.y1;
  59    if (rect2.y2 < rect1.y2) rect1.y2 = rect2.y2;
  60
  61    if (rect1.x1 > rect1.x2 || rect1.y1 > rect1.y2) return 0;
  62
  63    return (rect1.x2 - rect1.x1) * (rect1.y2 - rect1.y1);
  64 }
  65
  66 /*****************************************************************/
  67 /** \name Context (un)binding functions                          */
  68 /*****************************************************************/
  69 /*@{*/
  70
  71 /**
  72  * Unbind context.
  73  *
  74  * \param scrn the screen.
  75  * \param gc context.
  76  *
  77  * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
  78  *
  79  * \internal
  80  * This function calls __DriverAPIRec::UnbindContext, and then decrements
  81  * __DRIdrawableRec::refcount which must be non-zero for a successful
  82  * return.
  83  *
  84  * While casting the opaque private pointers associated with the parameters
  85  * into their respective real types it also assures they are not \c NULL.
  86  */
  87 static int driUnbindContext(__DRIcontext *pcp)
  88 {
  89     __DRIscreen *psp;
  90     __DRIdrawable *pdp;
  91     __DRIdrawable *prp;
  92
  93     /*
  94     ** Assume error checking is done properly in glXMakeCurrent before
  95     ** calling driUnbindContext.
  96     */
  97
  98     if (pcp == NULL)
  99         return GL_FALSE;
 100
 101     psp = pcp->driScreenPriv;
 102     pdp = pcp->driDrawablePriv;
 103     prp = pcp->driReadablePriv;
 104
 105     /* already unbound */
 106     if (!pdp && !prp)
 107       return GL_TRUE;
 108     /* Let driver unbind drawable from context */
 109     (*psp->DriverAPI.UnbindContext)(pcp);
 110
 111     assert(pdp);
 112     if (pdp->refcount == 0) {
 113         /* ERROR!!! */
 114         return GL_FALSE;
 115     }
 116
 117     dri_put_drawable(pdp);
 118
 119     if (prp != pdp) {
 120         if (prp->refcount == 0) {
 121             /* ERROR!!! */
 122             return GL_FALSE;
 123         }
 124
 125         dri_put_drawable(prp);
 126     }
 127
 128
 129     /* XXX this is disabled so that if we call SwapBuffers on an unbound
 130      * window we can determine the last context bound to the window and
 131      * use that context's lock. (BrianP, 2-Dec-2000)
 132      */
 133     pcp->driDrawablePriv = pcp->driReadablePriv = NULL;
 134
 135     return GL_TRUE;
 136 }
 137
 138 /**
 139  * This function takes both a read buffer and a draw buffer.  This is needed
 140  * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
 141  * function.
 142  */
 143 static int driBindContext(__DRIcontext *pcp,
 144                           __DRIdrawable *pdp,
 145                           __DRIdrawable *prp)
 146 {
 147     __DRIscreen *psp = NULL;
 148
 149     /*
 150     ** Assume error checking is done properly in glXMakeCurrent before
 151     ** calling driUnbindContext.
 152     */
 153
 154     if (!pcp)
 155         return GL_FALSE;
 156
 157     /* Bind the drawable to the context */
 158     psp = pcp->driScreenPriv;
 159     pcp->driDrawablePriv = pdp;
 160     pcp->driReadablePriv = prp;
 161     if (pdp) {
 162         pdp->driContextPriv = pcp;
 163         dri_get_drawable(pdp);
 164     }
 165     if (prp && pdp != prp) {
 166         dri_get_drawable(prp);
 167     }
 168
 169     /*
 170     ** Now that we have a context associated with this drawable, we can
 171     ** initialize the drawable information if has not been done before.
 172     */
 173
 174     if (!psp->dri2.enabled) {
 175         if (pdp && !pdp->pStamp) {
 176             DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 177             __driUtilUpdateDrawableInfo(pdp);
 178             DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 179         }
 180         if (prp && pdp != prp && !prp->pStamp) {
 181             DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 182             __driUtilUpdateDrawableInfo(prp);
 183             DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 184         }
 185     }
 186
 187     /* Call device-specific MakeCurrent */
 188     return (*psp->DriverAPI.MakeCurrent)(pcp, pdp, prp);
 189 }
 190
 191 /*@}*/
 192
 193
 194 /*****************************************************************/
 195 /** \name Drawable handling functions                            */
 196 /*****************************************************************/
 197 /*@{*/
 198
 199 /**
 200  * Update private drawable information.
 201  *
 202  * \param pdp pointer to the private drawable information to update.
 203  *
 204  * This function basically updates the __DRIdrawable struct's
 205  * cliprect information by calling \c __DRIinterfaceMethods::getDrawableInfo.
 206  * This is usually called by the DRI_VALIDATE_DRAWABLE_INFO macro which
 207  * compares the __DRIdrwablePrivate pStamp and lastStamp values.  If
 208  * the values are different that means we have to update the clipping
 209  * info.
 210  */
 211 void
 212 __driUtilUpdateDrawableInfo(__DRIdrawable *pdp)
 213 {
 214     __DRIscreen *psp = pdp->driScreenPriv;
 215     __DRIcontext *pcp = pdp->driContextPriv;
 216
 217     if (!pcp
 218         || ((pdp != pcp->driDrawablePriv) && (pdp != pcp->driReadablePriv))) {
 219         /* ERROR!!!
 220          * ...but we must ignore it. There can be many contexts bound to a
 221          * drawable.
 222          */
 223     }
 224
 225     if (pdp->pClipRects) {
 226         free(pdp->pClipRects);
 227         pdp->pClipRects = NULL;
 228     }
 229
 230     if (pdp->pBackClipRects) {
 231         free(pdp->pBackClipRects);
 232         pdp->pBackClipRects = NULL;
 233     }
 234
 235     DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 236
 237     if (! (*psp->getDrawableInfo->getDrawableInfo)(pdp,
 238                           &pdp->index, &pdp->lastStamp,
 239                           &pdp->x, &pdp->y, &pdp->w, &pdp->h,
 240                           &pdp->numClipRects, &pdp->pClipRects,
 241                           &pdp->backX,
 242                           &pdp->backY,
 243                           &pdp->numBackClipRects,
 244                           &pdp->pBackClipRects,
 245                           pdp->loaderPrivate)) {
 246         /* Error -- eg the window may have been destroyed.  Keep going
 247          * with no cliprects.
 248          */
 249         pdp->pStamp = &pdp->lastStamp; /* prevent endless loop */
 250         pdp->numClipRects = 0;
 251         pdp->pClipRects = NULL;
 252         pdp->numBackClipRects = 0;
 253         pdp->pBackClipRects = NULL;
 254     }
 255     else
 256        pdp->pStamp = &(psp->pSAREA->drawableTable[pdp->index].stamp);
 257
 258     DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
 259 }
 260
 261 /*@}*/
 262
 263 /*****************************************************************/
 264 /** \name GLX callbacks                                          */
 265 /*****************************************************************/
 266 /*@{*/
 267
 268 static void driReportDamage(__DRIdrawable *pdp,
 269                             struct drm_clip_rect *pClipRects, int numClipRects)
 270 {
 271     __DRIscreen *psp = pdp->driScreenPriv;
 272
 273     /* Check that we actually have the new damage report method */
 274     if (psp->damage) {
 275         /* Report the damage.  Currently, all our drivers draw
 276          * directly to the front buffer, so we report the damage there
 277          * rather than to the backing storein (if any).
 278          */
 279         (*psp->damage->reportDamage)(pdp,
 280                                      pdp->x, pdp->y,
 281                                      pClipRects, numClipRects,
 282                                      GL_TRUE, pdp->loaderPrivate);
 283     }
 284 }
 285
 286
 287 /**
 288  * Swap buffers.
 289  *
 290  * \param drawablePrivate opaque pointer to the per-drawable private info.
 291  *
 292  * \internal
 293  * This function calls __DRIdrawable::swapBuffers.
 294  *
 295  * Is called directly from glXSwapBuffers().
 296  */
 297 static void driSwapBuffers(__DRIdrawable *dPriv)
 298 {
 299     __DRIscreen *psp = dPriv->driScreenPriv;
 300     drm_clip_rect_t *rects;
 301     int i;
 302
 303     psp->DriverAPI.SwapBuffers(dPriv);
 304
 305     if (!dPriv->numClipRects)
 306         return;
 307
 308     rects = malloc(sizeof(*rects) * dPriv->numClipRects);
 309
 310     if (!rects)
 311         return;
 312
 313     for (i = 0; i < dPriv->numClipRects; i++) {
 314         rects[i].x1 = dPriv->pClipRects[i].x1 - dPriv->x;
 315         rects[i].y1 = dPriv->pClipRects[i].y1 - dPriv->y;
 316         rects[i].x2 = dPriv->pClipRects[i].x2 - dPriv->x;
 317         rects[i].y2 = dPriv->pClipRects[i].y2 - dPriv->y;
 318     }
 319
 320     driReportDamage(dPriv, rects, dPriv->numClipRects);
 321     free(rects);
 322 }
 323
 324 static int driDrawableGetMSC( __DRIscreen *sPriv, __DRIdrawable *dPriv,
 325                               int64_t *msc )
 326 {
 327     return sPriv->DriverAPI.GetDrawableMSC(sPriv, dPriv, msc);
 328 }
 329
 330
 331 static int driWaitForMSC(__DRIdrawable *dPriv, int64_t target_msc,
 332                          int64_t divisor, int64_t remainder,
 333                          int64_t * msc, int64_t * sbc)
 334 {
 335     __DRIswapInfo  sInfo;
 336     int  status;
 337
 338     status = dPriv->driScreenPriv->DriverAPI.WaitForMSC( dPriv, target_msc,
 339                                                          divisor, remainder,
 340                                                          msc );
 341
 342     /* GetSwapInfo() may not be provided by the driver if GLX_SGI_video_sync
 343      * is supported but GLX_OML_sync_control is not.  Therefore, don't return
 344      * an error value if GetSwapInfo() is not implemented.
 345     */
 346     if ( status == 0
 347          && dPriv->driScreenPriv->DriverAPI.GetSwapInfo ) {
 348         status = dPriv->driScreenPriv->DriverAPI.GetSwapInfo( dPriv, & sInfo );
 349         *sbc = sInfo.swap_count;
 350     }
 351
 352     return status;
 353 }
 354
 355
 356 const __DRImediaStreamCounterExtension driMediaStreamCounterExtension = {
 357     { __DRI_MEDIA_STREAM_COUNTER, __DRI_MEDIA_STREAM_COUNTER_VERSION },
 358     driWaitForMSC,
 359     driDrawableGetMSC,
 360 };
 361
 362
 363 /**
 364  * This is called via __DRIscreenRec's createNewDrawable pointer.
 365  */
 366 static __DRIdrawable *
 367 driCreateNewDrawable(__DRIscreen *psp, const __DRIconfig *config,
 368                      drm_drawable_t hwDrawable, int renderType,
 369                      const int *attrs, void *data)
 370 {
 371     __DRIdrawable *pdp;
 372
 373     /* Since pbuffers are not yet supported, no drawable attributes are
 374      * supported either.
 375      */
 376     (void) attrs;
 377     (void) renderType;
 378
 379     pdp = malloc(sizeof *pdp);
 380     if (!pdp) {
 381         return NULL;
 382     }
 383
 384     pdp->driContextPriv = NULL;
 385     pdp->loaderPrivate = data;
 386     pdp->hHWDrawable = hwDrawable;
 387     pdp->refcount = 1;
 388     pdp->pStamp = NULL;
 389     pdp->lastStamp = 0;
 390     pdp->index = 0;
 391     pdp->x = 0;
 392     pdp->y = 0;
 393     pdp->w = 0;
 394     pdp->h = 0;
 395     pdp->numClipRects = 0;
 396     pdp->numBackClipRects = 0;
 397     pdp->pClipRects = NULL;
 398     pdp->pBackClipRects = NULL;
 399     pdp->vblSeq = 0;
 400     pdp->vblFlags = 0;
 401
 402     pdp->driScreenPriv = psp;
 403
 404     if (!(*psp->DriverAPI.CreateBuffer)(psp, pdp, &config->modes, 0)) {
 405        free(pdp);
 406        return NULL;
 407     }
 408
 409     pdp->msc_base = 0;
 410
 411     /* This special default value is replaced with the configured
 412      * default value when the drawable is first bound to a direct
 413      * rendering context.
 414      */
 415     pdp->swap_interval = (unsigned)-1;
 416
 417     return pdp;
 418 }
 419
 420
 421 static __DRIdrawable *
 422 dri2CreateNewDrawable(__DRIscreen *screen,
 423                       const __DRIconfig *config,
 424                       void *loaderPrivate)
 425 {
 426     __DRIdrawable *pdraw;
 427
 428     pdraw = driCreateNewDrawable(screen, config, 0, 0, NULL, loaderPrivate);
 429     if (!pdraw)
 430         return NULL;
 431
 432     pdraw->pClipRects = &pdraw->dri2.clipRect;
 433     pdraw->pBackClipRects = &pdraw->dri2.clipRect;
 434
 435     pdraw->pStamp = &pdraw->dri2.stamp;
 436     *pdraw->pStamp = pdraw->lastStamp + 1;
 437
 438     return pdraw;
 439 }
 440
 441 static __DRIbuffer *
 442 dri2AllocateBuffer(__DRIscreen *screen,
 443                    unsigned int attachment, unsigned int format,
 444                    int width, int height)
 445 {
 446     return (*screen->DriverAPI.AllocateBuffer)(screen, attachment, format,
 447                                                width, height);
 448 }
 449
 450 static void
 451 dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 452 {
 453    (*screen->DriverAPI.ReleaseBuffer)(screen, buffer);
 454 }
 455
 456
 457 static int
 458 dri2ConfigQueryb(__DRIscreen *screen, const char *var, GLboolean *val)
 459 {
 460    if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
 461       return -1;
 462
 463    *val = driQueryOptionb(&screen->optionCache, var);
 464
 465    return 0;
 466 }
 467
 468 static int
 469 dri2ConfigQueryi(__DRIscreen *screen, const char *var, GLint *val)
 470 {
 471    if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
 472        !driCheckOption(&screen->optionCache, var, DRI_ENUM))
 473       return -1;
 474
 475     *val = driQueryOptioni(&screen->optionCache, var);
 476
 477     return 0;
 478 }
 479
 480 static int
 481 dri2ConfigQueryf(__DRIscreen *screen, const char *var, GLfloat *val)
 482 {
 483    if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
 484       return -1;
 485
 486     *val = driQueryOptionf(&screen->optionCache, var);
 487
 488     return 0;
 489 }
 490
 491
 492 static void dri_get_drawable(__DRIdrawable *pdp)
 493 {
 494     pdp->refcount++;
 495 }
 496
 497 static void dri_put_drawable(__DRIdrawable *pdp)
 498 {
 499     __DRIscreen *psp;
 500
 501     if (pdp) {
 502         pdp->refcount--;
 503         if (pdp->refcount)
 504             return;
 505
 506         psp = pdp->driScreenPriv;
 507         (*psp->DriverAPI.DestroyBuffer)(pdp);
 508         if (pdp->pClipRects && pdp->pClipRects != &pdp->dri2.clipRect) {
 509             free(pdp->pClipRects);
 510             pdp->pClipRects = NULL;
 511         }
 512         if (pdp->pBackClipRects && pdp->pClipRects != &pdp->dri2.clipRect) {
 513             free(pdp->pBackClipRects);
 514             pdp->pBackClipRects = NULL;
 515         }
 516         free(pdp);
 517     }
 518 }
 519
 520 static void
 521 driDestroyDrawable(__DRIdrawable *pdp)
 522 {
 523     dri_put_drawable(pdp);
 524 }
 525
 526 /*@}*/
 527
 528
 529 /*****************************************************************/
 530 /** \name Context handling functions                             */
 531 /*****************************************************************/
 532 /*@{*/
 533
 534 /**
 535  * Destroy the per-context private information.
 536  *
 537  * \internal
 538  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
 539  * drmDestroyContext(), and finally frees \p contextPrivate.
 540  */
 541 static void
 542 driDestroyContext(__DRIcontext *pcp)
 543 {
 544     if (pcp) {
 545         (*pcp->driScreenPriv->DriverAPI.DestroyContext)(pcp);
 546         free(pcp);
 547     }
 548 }
 549
 550
 551 /**
 552  * Create the per-drawable private driver information.
 553  *
 554  * \param render_type   Type of rendering target.  \c GLX_RGBA_TYPE is the only
 555  *                      type likely to ever be supported for direct-rendering.
 556  *                      However, \c GLX_RGBA_FLOAT_TYPE_ARB may eventually be
 557  *                      supported by some drivers.
 558  * \param shared        Context with which to share textures, etc. or NULL
 559  *
 560  * \returns An opaque pointer to the per-context private information on
 561  *          success, or \c NULL on failure.
 562  *
 563  * \internal
 564  * This function allocates and fills a __DRIcontextRec structure.  It
 565  * performs some device independent initialization and passes all the
 566  * relevent information to __DriverAPIRec::CreateContext to create the
 567  * context.
 568  *
 569  */
 570 static __DRIcontext *
 571 driCreateNewContext(__DRIscreen *psp, const __DRIconfig *config,
 572                     int render_type, __DRIcontext *shared,
 573                     drm_context_t hwContext, void *data)
 574 {
 575     __DRIcontext *pcp;
 576     void * const shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 577
 578     (void) render_type;
 579
 580     pcp = malloc(sizeof *pcp);
 581     if (!pcp)
 582         return NULL;
 583
 584     pcp->driScreenPriv = psp;
 585     pcp->driDrawablePriv = NULL;
 586     pcp->loaderPrivate = data;
 587
 588     pcp->dri2.draw_stamp = 0;
 589     pcp->dri2.read_stamp = 0;
 590
 591     pcp->hHWContext = hwContext;
 592
 593     if ( !(*psp->DriverAPI.CreateContext)(API_OPENGL,
 594                                           &config->modes, pcp, shareCtx) ) {
 595         free(pcp);
 596         return NULL;
 597     }
 598
 599     return pcp;
 600 }
 601
 602 static unsigned int
 603 dri2GetAPIMask(__DRIscreen *screen)
 604 {
 605     return screen->api_mask;
 606 }
 607
 608 static __DRIcontext *
 609 dri2CreateNewContextForAPI(__DRIscreen *screen, int api,
 610                            const __DRIconfig *config,
 611                            __DRIcontext *shared, void *data)
 612 {
 613     __DRIcontext *context;
 614     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
 615     void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 616     gl_api mesa_api;
 617
 618     if (!(screen->api_mask & (1 << api)))
 619         return NULL;
 620
 621     switch (api) {
 622     case __DRI_API_OPENGL:
 623             mesa_api = API_OPENGL;
 624             break;
 625     case __DRI_API_GLES:
 626             mesa_api = API_OPENGLES;
 627             break;
 628     case __DRI_API_GLES2:
 629             mesa_api = API_OPENGLES2;
 630             break;
 631     default:
 632             return NULL;
 633     }
 634
 635     context = malloc(sizeof *context);
 636     if (!context)
 637         return NULL;
 638
 639     context->driScreenPriv = screen;
 640     context->driDrawablePriv = NULL;
 641     context->loaderPrivate = data;
 642
 643     if (!(*screen->DriverAPI.CreateContext)(mesa_api, modes,
 644                                             context, shareCtx) ) {
 645         free(context);
 646         return NULL;
 647     }
 648
 649     return context;
 650 }
 651
 652
 653 static __DRIcontext *
 654 dri2CreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 655                       __DRIcontext *shared, void *data)
 656 {
 657    return dri2CreateNewContextForAPI(screen, __DRI_API_OPENGL,
 658                                      config, shared, data);
 659 }
 660
 661 static int
 662 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
 663 {
 664     (void) dest;
 665     (void) src;
 666     (void) mask;
 667     return GL_FALSE;
 668 }
 669
 670 /*@}*/
 671
 672
 673 /*****************************************************************/
 674 /** \name Screen handling functions                              */
 675 /*****************************************************************/
 676 /*@{*/
 677
 678 /**
 679  * Destroy the per-screen private information.
 680  *
 681  * \internal
 682  * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
 683  * drmClose(), and finally frees \p screenPrivate.
 684  */
 685 static void driDestroyScreen(__DRIscreen *psp)
 686 {
 687     if (psp) {
 688         /* No interaction with the X-server is possible at this point.  This
 689          * routine is called after XCloseDisplay, so there is no protocol
 690          * stream open to the X-server anymore.
 691          */
 692
 693        _mesa_destroy_shader_compiler();
 694
 695         if (psp->DriverAPI.DestroyScreen)
 696             (*psp->DriverAPI.DestroyScreen)(psp);
 697
 698         if (!psp->dri2.enabled) {
 699            (void)drmUnmap((drmAddress)psp->pSAREA, SAREA_MAX);
 700            (void)drmUnmap((drmAddress)psp->pFB, psp->fbSize);
 701            (void)drmCloseOnce(psp->fd);
 702         } else {
 703            driDestroyOptionCache(&psp->optionCache);
 704            driDestroyOptionInfo(&psp->optionInfo);
 705         }
 706
 707         free(psp);
 708     }
 709 }
 710
 711 static void
 712 setupLoaderExtensions(__DRIscreen *psp,
 713                       const __DRIextension **extensions)
 714 {
 715     int i;
 716
 717     for (i = 0; extensions[i]; i++) {
 718         if (strcmp(extensions[i]->name, __DRI_GET_DRAWABLE_INFO) == 0)
 719             psp->getDrawableInfo = (__DRIgetDrawableInfoExtension *) extensions[i];
 720         if (strcmp(extensions[i]->name, __DRI_DAMAGE) == 0)
 721             psp->damage = (__DRIdamageExtension *) extensions[i];
 722         if (strcmp(extensions[i]->name, __DRI_SYSTEM_TIME) == 0)
 723             psp->systemTime = (__DRIsystemTimeExtension *) extensions[i];
 724         if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
 725             psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
 726         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)
 727             psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];
 728         if (strcmp(extensions[i]->name, __DRI_USE_INVALIDATE) == 0)
 729             psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];
 730     }
 731 }
 732
 733 /**
 734  * This is the bootstrap function for the driver.  libGL supplies all of the
 735  * requisite information about the system, and the driver initializes itself.
 736  * This routine also fills in the linked list pointed to by \c driver_modes
 737  * with the \c struct gl_config that the driver can support for windows or
 738  * pbuffers.
 739  *
 740  * For legacy DRI.
 741  *
 742  * \param scrn  Index of the screen
 743  * \param ddx_version Version of the 2D DDX.  This may not be meaningful for
 744  *                    all drivers.
 745  * \param dri_version Version of the "server-side" DRI.
 746  * \param drm_version Version of the kernel DRM.
 747  * \param frame_buffer Data describing the location and layout of the
 748  *                     framebuffer.
 749  * \param pSAREA       Pointer to the SAREA.
 750  * \param fd           Device handle for the DRM.
 751  * \param extensions   ??
 752  * \param driver_modes  Returns modes suppoted by the driver
 753  * \param loaderPrivate  ??
 754  *
 755  * \note There is no need to check the minimum API version in this
 756  * function.  Since the name of this function is versioned, it is
 757  * impossible for a loader that is too old to even load this driver.
 758  */
 759 static __DRIscreen *
 760 driCreateNewScreen(int scrn,
 761                    const __DRIversion *ddx_version,
 762                    const __DRIversion *dri_version,
 763                    const __DRIversion *drm_version,
 764                    const __DRIframebuffer *frame_buffer,
 765                    drmAddress pSAREA, int fd,
 766                    const __DRIextension **extensions,
 767                    const __DRIconfig ***driver_modes,
 768                    void *loaderPrivate)
 769 {
 770     static const __DRIextension *emptyExtensionList[] = { NULL };
 771     __DRIscreen *psp;
 772
 773     (void) loaderPrivate;
 774
 775     if (driDriverAPI.InitScreen == NULL) {
 776         __driUtilMessage("driver does not support DRI1");
 777         return NULL;
 778     }
 779
 780     psp = calloc(1, sizeof *psp);
 781     if (!psp)
 782         return NULL;
 783
 784     setupLoaderExtensions(psp, extensions);
 785
 786     /*
 787     ** NOT_DONE: This is used by the X server to detect when the client
 788     ** has died while holding the drawable lock.  The client sets the
 789     ** drawable lock to this value.
 790     */
 791     psp->drawLockID = 1;
 792
 793     psp->drm_version = *drm_version;
 794     psp->ddx_version = *ddx_version;
 795     psp->dri_version = *dri_version;
 796
 797     psp->pSAREA = pSAREA;
 798     psp->lock = (drmLock *) &psp->pSAREA->lock;
 799
 800     psp->pFB = frame_buffer->base;
 801     psp->fbSize = frame_buffer->size;
 802     psp->fbStride = frame_buffer->stride;
 803     psp->fbWidth = frame_buffer->width;
 804     psp->fbHeight = frame_buffer->height;
 805     psp->devPrivSize = frame_buffer->dev_priv_size;
 806     psp->pDevPriv = frame_buffer->dev_priv;
 807     psp->fbBPP = psp->fbStride * 8 / frame_buffer->width;
 808
 809     psp->extensions = emptyExtensionList;
 810     psp->fd = fd;
 811     psp->myNum = scrn;
 812     psp->dri2.enabled = GL_FALSE;
 813
 814     psp->DriverAPI = driDriverAPI;
 815     psp->api_mask = (1 << __DRI_API_OPENGL);
 816
 817     *driver_modes = driDriverAPI.InitScreen(psp);
 818     if (*driver_modes == NULL) {
 819         free(psp);
 820         return NULL;
 821     }
 822
 823     return psp;
 824 }
 825
 826 /**
 827  * DRI2
 828  */
 829 static __DRIscreen *
 830 dri2CreateNewScreen(int scrn, int fd,
 831                     const __DRIextension **extensions,
 832                     const __DRIconfig ***driver_configs, void *data)
 833 {
 834     static const __DRIextension *emptyExtensionList[] = { NULL };
 835     __DRIscreen *psp;
 836     drmVersionPtr version;
 837
 838     if (driDriverAPI.InitScreen2 == NULL)
 839         return NULL;
 840
 841     psp = calloc(1, sizeof(*psp));
 842     if (!psp)
 843         return NULL;
 844
 845     setupLoaderExtensions(psp, extensions);
 846
 847     version = drmGetVersion(fd);
 848     if (version) {
 849         psp->drm_version.major = version->version_major;
 850         psp->drm_version.minor = version->version_minor;
 851         psp->drm_version.patch = version->version_patchlevel;
 852         drmFreeVersion(version);
 853     }
 854
 855     psp->extensions = emptyExtensionList;
 856     psp->fd = fd;
 857     psp->myNum = scrn;
 858     psp->dri2.enabled = GL_TRUE;
 859
 860     psp->DriverAPI = driDriverAPI;
 861     psp->api_mask = (1 << __DRI_API_OPENGL);
 862     *driver_configs = driDriverAPI.InitScreen2(psp);
 863     if (*driver_configs == NULL) {
 864         free(psp);
 865         return NULL;
 866     }
 867
 868     psp->DriverAPI = driDriverAPI;
 869     psp->loaderPrivate = data;
 870
 871     driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions,
 872                        __dri2NConfigOptions);
 873     driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum,
 874                         "dri2");
 875
 876     return psp;
 877 }
 878
 879 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 880 {
 881     return psp->extensions;
 882 }
 883
 884 /** Core interface */
 885 const __DRIcoreExtension driCoreExtension = {
 886     { __DRI_CORE, __DRI_CORE_VERSION },
 887     NULL,
 888     driDestroyScreen,
 889     driGetExtensions,
 890     driGetConfigAttrib,
 891     driIndexConfigAttrib,
 892     NULL,
 893     driDestroyDrawable,
 894     driSwapBuffers,
 895     NULL,
 896     driCopyContext,
 897     driDestroyContext,
 898     driBindContext,
 899     driUnbindContext
 900 };
 901
 902 /** DRI2 interface */
 903 const __DRIdri2Extension driDRI2Extension = {
 904     { __DRI_DRI2, __DRI_DRI2_VERSION },
 905     dri2CreateNewScreen,
 906     dri2CreateNewDrawable,
 907     dri2CreateNewContext,
 908     dri2GetAPIMask,
 909     dri2CreateNewContextForAPI,
 910     dri2AllocateBuffer,
 911     dri2ReleaseBuffer
 912 };
 913
 914 const __DRI2configQueryExtension dri2ConfigQueryExtension = {
 915    { __DRI2_CONFIG_QUERY, __DRI2_CONFIG_QUERY_VERSION },
 916    dri2ConfigQueryb,
 917    dri2ConfigQueryi,
 918    dri2ConfigQueryf,
 919 };
 920
 921 /**
 922  * Calculate amount of swap interval used between GLX buffer swaps.
 923  *
 924  * The usage value, on the range [0,max], is the fraction of total swap
 925  * interval time used between GLX buffer swaps is calculated.
 926  *
 927  *            \f$p = t_d / (i * t_r)\f$
 928  *
 929  * Where \f$t_d\f$ is the time since the last GLX buffer swap, \f$i\f$ is the
 930  * swap interval (as set by \c glXSwapIntervalSGI), and \f$t_r\f$ time
 931  * required for a single vertical refresh period (as returned by \c
 932  * glXGetMscRateOML).
 933  *
 934  * See the documentation for the GLX_MESA_swap_frame_usage extension for more
 935  * details.
 936  *
 937  * \param   dPriv  Pointer to the private drawable structure.
 938  * \return  If less than a single swap interval time period was required
 939  *          between GLX buffer swaps, a number greater than 0 and less than
 940  *          1.0 is returned.  If exactly one swap interval time period is
 941  *          required, 1.0 is returned, and if more than one is required then
 942  *          a number greater than 1.0 will be returned.
 943  *
 944  * \sa glXSwapIntervalSGI glXGetMscRateOML
 945  *
 946  * \todo Instead of caching the \c glXGetMscRateOML function pointer, would it
 947  *       be possible to cache the sync rate?
 948  */
 949 float
 950 driCalculateSwapUsage( __DRIdrawable *dPriv, int64_t last_swap_ust,
 951                        int64_t current_ust )
 952 {
 953    int32_t   n;
 954    int32_t   d;
 955    int       interval;
 956    float     usage = 1.0;
 957    __DRIscreen *psp = dPriv->driScreenPriv;
 958
 959    if ( (*psp->systemTime->getMSCRate)(dPriv, &n, &d, dPriv->loaderPrivate) ) {
 960       interval = (dPriv->swap_interval != 0) ? dPriv->swap_interval : 1;
 961
 962
 963       /* We want to calculate
 964        * (current_UST - last_swap_UST) / (interval * us_per_refresh).  We get
 965        * current_UST by calling __glXGetUST.  last_swap_UST is stored in
 966        * dPriv->swap_ust.  interval has already been calculated.
 967        *
 968        * The only tricky part is us_per_refresh.  us_per_refresh is
 969        * 1000000 / MSC_rate.  We know the MSC_rate is n / d.  We can flip it
 970        * around and say us_per_refresh = 1000000 * d / n.  Since this goes in
 971        * the denominator of the final calculation, we calculate
 972        * (interval * 1000000 * d) and move n into the numerator.
 973        */
 974
 975       usage = (current_ust - last_swap_ust);
 976       usage *= n;
 977       usage /= (interval * d);
 978       usage /= 1000000.0;
 979    }
 980
 981    return usage;
 982 }
 983
 984 void
 985 dri2InvalidateDrawable(__DRIdrawable *drawable)
 986 {
 987     drawable->dri2.stamp++;
 988 }
 989
 990 /*@}*/