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 static void driCopySubBuffer(__DRIdrawable *dPriv,
 364                               int x, int y, int w, int h)
 365 {
 366     drm_clip_rect_t rect;
 367
 368     rect.x1 = x;
 369     rect.y1 = dPriv->h - y - h;
 370     rect.x2 = x + w;
 371     rect.y2 = rect.y1 + h;
 372     driReportDamage(dPriv, &rect, 1);
 373
 374     dPriv->driScreenPriv->DriverAPI.CopySubBuffer(dPriv, x, y, w, h);
 375 }
 376
 377 const __DRIcopySubBufferExtension driCopySubBufferExtension = {
 378     { __DRI_COPY_SUB_BUFFER, __DRI_COPY_SUB_BUFFER_VERSION },
 379     driCopySubBuffer
 380 };
 381
 382 static void driSetSwapInterval(__DRIdrawable *dPriv, unsigned int interval)
 383 {
 384     dPriv->swap_interval = interval;
 385 }
 386
 387 static unsigned int driGetSwapInterval(__DRIdrawable *dPriv)
 388 {
 389     return dPriv->swap_interval;
 390 }
 391
 392 const __DRIswapControlExtension driSwapControlExtension = {
 393     { __DRI_SWAP_CONTROL, __DRI_SWAP_CONTROL_VERSION },
 394     driSetSwapInterval,
 395     driGetSwapInterval
 396 };
 397
 398
 399 /**
 400  * This is called via __DRIscreenRec's createNewDrawable pointer.
 401  */
 402 static __DRIdrawable *
 403 driCreateNewDrawable(__DRIscreen *psp, const __DRIconfig *config,
 404                      drm_drawable_t hwDrawable, int renderType,
 405                      const int *attrs, void *data)
 406 {
 407     __DRIdrawable *pdp;
 408
 409     /* Since pbuffers are not yet supported, no drawable attributes are
 410      * supported either.
 411      */
 412     (void) attrs;
 413     (void) renderType;
 414
 415     pdp = malloc(sizeof *pdp);
 416     if (!pdp) {
 417         return NULL;
 418     }
 419
 420     pdp->driContextPriv = NULL;
 421     pdp->loaderPrivate = data;
 422     pdp->hHWDrawable = hwDrawable;
 423     pdp->refcount = 1;
 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
 440     if (!(*psp->DriverAPI.CreateBuffer)(psp, pdp, &config->modes, 0)) {
 441        free(pdp);
 442        return NULL;
 443     }
 444
 445     pdp->msc_base = 0;
 446
 447     /* This special default value is replaced with the configured
 448      * default value when the drawable is first bound to a direct
 449      * rendering context.
 450      */
 451     pdp->swap_interval = (unsigned)-1;
 452
 453     return pdp;
 454 }
 455
 456
 457 static __DRIdrawable *
 458 dri2CreateNewDrawable(__DRIscreen *screen,
 459                       const __DRIconfig *config,
 460                       void *loaderPrivate)
 461 {
 462     __DRIdrawable *pdraw;
 463
 464     pdraw = driCreateNewDrawable(screen, config, 0, 0, NULL, loaderPrivate);
 465     if (!pdraw)
 466         return NULL;
 467
 468     pdraw->pClipRects = &pdraw->dri2.clipRect;
 469     pdraw->pBackClipRects = &pdraw->dri2.clipRect;
 470
 471     pdraw->pStamp = &pdraw->dri2.stamp;
 472     *pdraw->pStamp = pdraw->lastStamp + 1;
 473
 474     return pdraw;
 475 }
 476
 477 static __DRIbuffer *
 478 dri2AllocateBuffer(__DRIscreen *screen,
 479                    unsigned int attachment, unsigned int format,
 480                    int width, int height)
 481 {
 482     return (*screen->DriverAPI.AllocateBuffer)(screen, attachment, format,
 483                                                width, height);
 484 }
 485
 486 static void
 487 dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 488 {
 489    (*screen->DriverAPI.ReleaseBuffer)(screen, buffer);
 490 }
 491
 492
 493 static int
 494 dri2ConfigQueryb(__DRIscreen *screen, const char *var, GLboolean *val)
 495 {
 496    if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
 497       return -1;
 498
 499    *val = driQueryOptionb(&screen->optionCache, var);
 500
 501    return 0;
 502 }
 503
 504 static int
 505 dri2ConfigQueryi(__DRIscreen *screen, const char *var, GLint *val)
 506 {
 507    if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
 508        !driCheckOption(&screen->optionCache, var, DRI_ENUM))
 509       return -1;
 510
 511     *val = driQueryOptioni(&screen->optionCache, var);
 512
 513     return 0;
 514 }
 515
 516 static int
 517 dri2ConfigQueryf(__DRIscreen *screen, const char *var, GLfloat *val)
 518 {
 519    if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
 520       return -1;
 521
 522     *val = driQueryOptionf(&screen->optionCache, var);
 523
 524     return 0;
 525 }
 526
 527
 528 static void dri_get_drawable(__DRIdrawable *pdp)
 529 {
 530     pdp->refcount++;
 531 }
 532
 533 static void dri_put_drawable(__DRIdrawable *pdp)
 534 {
 535     __DRIscreen *psp;
 536
 537     if (pdp) {
 538         pdp->refcount--;
 539         if (pdp->refcount)
 540             return;
 541
 542         psp = pdp->driScreenPriv;
 543         (*psp->DriverAPI.DestroyBuffer)(pdp);
 544         if (pdp->pClipRects && pdp->pClipRects != &pdp->dri2.clipRect) {
 545             free(pdp->pClipRects);
 546             pdp->pClipRects = NULL;
 547         }
 548         if (pdp->pBackClipRects && pdp->pClipRects != &pdp->dri2.clipRect) {
 549             free(pdp->pBackClipRects);
 550             pdp->pBackClipRects = NULL;
 551         }
 552         free(pdp);
 553     }
 554 }
 555
 556 static void
 557 driDestroyDrawable(__DRIdrawable *pdp)
 558 {
 559     dri_put_drawable(pdp);
 560 }
 561
 562 /*@}*/
 563
 564
 565 /*****************************************************************/
 566 /** \name Context handling functions                             */
 567 /*****************************************************************/
 568 /*@{*/
 569
 570 /**
 571  * Destroy the per-context private information.
 572  *
 573  * \internal
 574  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
 575  * drmDestroyContext(), and finally frees \p contextPrivate.
 576  */
 577 static void
 578 driDestroyContext(__DRIcontext *pcp)
 579 {
 580     if (pcp) {
 581         (*pcp->driScreenPriv->DriverAPI.DestroyContext)(pcp);
 582         free(pcp);
 583     }
 584 }
 585
 586
 587 /**
 588  * Create the per-drawable private driver information.
 589  *
 590  * \param render_type   Type of rendering target.  \c GLX_RGBA_TYPE is the only
 591  *                      type likely to ever be supported for direct-rendering.
 592  *                      However, \c GLX_RGBA_FLOAT_TYPE_ARB may eventually be
 593  *                      supported by some drivers.
 594  * \param shared        Context with which to share textures, etc. or NULL
 595  *
 596  * \returns An opaque pointer to the per-context private information on
 597  *          success, or \c NULL on failure.
 598  *
 599  * \internal
 600  * This function allocates and fills a __DRIcontextRec structure.  It
 601  * performs some device independent initialization and passes all the
 602  * relevent information to __DriverAPIRec::CreateContext to create the
 603  * context.
 604  *
 605  */
 606 static __DRIcontext *
 607 driCreateNewContext(__DRIscreen *psp, const __DRIconfig *config,
 608                     int render_type, __DRIcontext *shared,
 609                     drm_context_t hwContext, void *data)
 610 {
 611     __DRIcontext *pcp;
 612     void * const shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 613
 614     (void) render_type;
 615
 616     pcp = malloc(sizeof *pcp);
 617     if (!pcp)
 618         return NULL;
 619
 620     pcp->driScreenPriv = psp;
 621     pcp->driDrawablePriv = NULL;
 622     pcp->loaderPrivate = data;
 623
 624     pcp->dri2.draw_stamp = 0;
 625     pcp->dri2.read_stamp = 0;
 626
 627     pcp->hHWContext = hwContext;
 628
 629     if ( !(*psp->DriverAPI.CreateContext)(API_OPENGL,
 630                                           &config->modes, pcp, shareCtx) ) {
 631         free(pcp);
 632         return NULL;
 633     }
 634
 635     return pcp;
 636 }
 637
 638 static unsigned int
 639 dri2GetAPIMask(__DRIscreen *screen)
 640 {
 641     return screen->api_mask;
 642 }
 643
 644 static __DRIcontext *
 645 dri2CreateNewContextForAPI(__DRIscreen *screen, int api,
 646                            const __DRIconfig *config,
 647                            __DRIcontext *shared, void *data)
 648 {
 649     __DRIcontext *context;
 650     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
 651     void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 652     gl_api mesa_api;
 653
 654     if (!(screen->api_mask & (1 << api)))
 655         return NULL;
 656
 657     switch (api) {
 658     case __DRI_API_OPENGL:
 659             mesa_api = API_OPENGL;
 660             break;
 661     case __DRI_API_GLES:
 662             mesa_api = API_OPENGLES;
 663             break;
 664     case __DRI_API_GLES2:
 665             mesa_api = API_OPENGLES2;
 666             break;
 667     default:
 668             return NULL;
 669     }
 670
 671     context = malloc(sizeof *context);
 672     if (!context)
 673         return NULL;
 674
 675     context->driScreenPriv = screen;
 676     context->driDrawablePriv = NULL;
 677     context->loaderPrivate = data;
 678
 679     if (!(*screen->DriverAPI.CreateContext)(mesa_api, modes,
 680                                             context, shareCtx) ) {
 681         free(context);
 682         return NULL;
 683     }
 684
 685     return context;
 686 }
 687
 688
 689 static __DRIcontext *
 690 dri2CreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 691                       __DRIcontext *shared, void *data)
 692 {
 693    return dri2CreateNewContextForAPI(screen, __DRI_API_OPENGL,
 694                                      config, shared, data);
 695 }
 696
 697 static int
 698 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
 699 {
 700     (void) dest;
 701     (void) src;
 702     (void) mask;
 703     return GL_FALSE;
 704 }
 705
 706 /*@}*/
 707
 708
 709 /*****************************************************************/
 710 /** \name Screen handling functions                              */
 711 /*****************************************************************/
 712 /*@{*/
 713
 714 /**
 715  * Destroy the per-screen private information.
 716  *
 717  * \internal
 718  * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
 719  * drmClose(), and finally frees \p screenPrivate.
 720  */
 721 static void driDestroyScreen(__DRIscreen *psp)
 722 {
 723     if (psp) {
 724         /* No interaction with the X-server is possible at this point.  This
 725          * routine is called after XCloseDisplay, so there is no protocol
 726          * stream open to the X-server anymore.
 727          */
 728
 729        _mesa_destroy_shader_compiler();
 730
 731         if (psp->DriverAPI.DestroyScreen)
 732             (*psp->DriverAPI.DestroyScreen)(psp);
 733
 734         if (!psp->dri2.enabled) {
 735            (void)drmUnmap((drmAddress)psp->pSAREA, SAREA_MAX);
 736            (void)drmUnmap((drmAddress)psp->pFB, psp->fbSize);
 737            (void)drmCloseOnce(psp->fd);
 738         } else {
 739            driDestroyOptionCache(&psp->optionCache);
 740            driDestroyOptionInfo(&psp->optionInfo);
 741         }
 742
 743         free(psp);
 744     }
 745 }
 746
 747 static void
 748 setupLoaderExtensions(__DRIscreen *psp,
 749                       const __DRIextension **extensions)
 750 {
 751     int i;
 752
 753     for (i = 0; extensions[i]; i++) {
 754         if (strcmp(extensions[i]->name, __DRI_GET_DRAWABLE_INFO) == 0)
 755             psp->getDrawableInfo = (__DRIgetDrawableInfoExtension *) extensions[i];
 756         if (strcmp(extensions[i]->name, __DRI_DAMAGE) == 0)
 757             psp->damage = (__DRIdamageExtension *) extensions[i];
 758         if (strcmp(extensions[i]->name, __DRI_SYSTEM_TIME) == 0)
 759             psp->systemTime = (__DRIsystemTimeExtension *) extensions[i];
 760         if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
 761             psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
 762         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)
 763             psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];
 764         if (strcmp(extensions[i]->name, __DRI_USE_INVALIDATE) == 0)
 765             psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];
 766     }
 767 }
 768
 769 /**
 770  * This is the bootstrap function for the driver.  libGL supplies all of the
 771  * requisite information about the system, and the driver initializes itself.
 772  * This routine also fills in the linked list pointed to by \c driver_modes
 773  * with the \c struct gl_config that the driver can support for windows or
 774  * pbuffers.
 775  *
 776  * For legacy DRI.
 777  *
 778  * \param scrn  Index of the screen
 779  * \param ddx_version Version of the 2D DDX.  This may not be meaningful for
 780  *                    all drivers.
 781  * \param dri_version Version of the "server-side" DRI.
 782  * \param drm_version Version of the kernel DRM.
 783  * \param frame_buffer Data describing the location and layout of the
 784  *                     framebuffer.
 785  * \param pSAREA       Pointer to the SAREA.
 786  * \param fd           Device handle for the DRM.
 787  * \param extensions   ??
 788  * \param driver_modes  Returns modes suppoted by the driver
 789  * \param loaderPrivate  ??
 790  *
 791  * \note There is no need to check the minimum API version in this
 792  * function.  Since the name of this function is versioned, it is
 793  * impossible for a loader that is too old to even load this driver.
 794  */
 795 static __DRIscreen *
 796 driCreateNewScreen(int scrn,
 797                    const __DRIversion *ddx_version,
 798                    const __DRIversion *dri_version,
 799                    const __DRIversion *drm_version,
 800                    const __DRIframebuffer *frame_buffer,
 801                    drmAddress pSAREA, int fd,
 802                    const __DRIextension **extensions,
 803                    const __DRIconfig ***driver_modes,
 804                    void *loaderPrivate)
 805 {
 806     static const __DRIextension *emptyExtensionList[] = { NULL };
 807     __DRIscreen *psp;
 808
 809     (void) loaderPrivate;
 810
 811     if (driDriverAPI.InitScreen == NULL) {
 812         __driUtilMessage("driver does not support DRI1");
 813         return NULL;
 814     }
 815
 816     psp = calloc(1, sizeof *psp);
 817     if (!psp)
 818         return NULL;
 819
 820     setupLoaderExtensions(psp, extensions);
 821
 822     /*
 823     ** NOT_DONE: This is used by the X server to detect when the client
 824     ** has died while holding the drawable lock.  The client sets the
 825     ** drawable lock to this value.
 826     */
 827     psp->drawLockID = 1;
 828
 829     psp->drm_version = *drm_version;
 830     psp->ddx_version = *ddx_version;
 831     psp->dri_version = *dri_version;
 832
 833     psp->pSAREA = pSAREA;
 834     psp->lock = (drmLock *) &psp->pSAREA->lock;
 835
 836     psp->pFB = frame_buffer->base;
 837     psp->fbSize = frame_buffer->size;
 838     psp->fbStride = frame_buffer->stride;
 839     psp->fbWidth = frame_buffer->width;
 840     psp->fbHeight = frame_buffer->height;
 841     psp->devPrivSize = frame_buffer->dev_priv_size;
 842     psp->pDevPriv = frame_buffer->dev_priv;
 843     psp->fbBPP = psp->fbStride * 8 / frame_buffer->width;
 844
 845     psp->extensions = emptyExtensionList;
 846     psp->fd = fd;
 847     psp->myNum = scrn;
 848     psp->dri2.enabled = GL_FALSE;
 849
 850     psp->DriverAPI = driDriverAPI;
 851     psp->api_mask = (1 << __DRI_API_OPENGL);
 852
 853     *driver_modes = driDriverAPI.InitScreen(psp);
 854     if (*driver_modes == NULL) {
 855         free(psp);
 856         return NULL;
 857     }
 858
 859     return psp;
 860 }
 861
 862 /**
 863  * DRI2
 864  */
 865 static __DRIscreen *
 866 dri2CreateNewScreen(int scrn, int fd,
 867                     const __DRIextension **extensions,
 868                     const __DRIconfig ***driver_configs, void *data)
 869 {
 870     static const __DRIextension *emptyExtensionList[] = { NULL };
 871     __DRIscreen *psp;
 872     drmVersionPtr version;
 873
 874     if (driDriverAPI.InitScreen2 == NULL)
 875         return NULL;
 876
 877     psp = calloc(1, sizeof(*psp));
 878     if (!psp)
 879         return NULL;
 880
 881     setupLoaderExtensions(psp, extensions);
 882
 883     version = drmGetVersion(fd);
 884     if (version) {
 885         psp->drm_version.major = version->version_major;
 886         psp->drm_version.minor = version->version_minor;
 887         psp->drm_version.patch = version->version_patchlevel;
 888         drmFreeVersion(version);
 889     }
 890
 891     psp->extensions = emptyExtensionList;
 892     psp->fd = fd;
 893     psp->myNum = scrn;
 894     psp->dri2.enabled = GL_TRUE;
 895
 896     psp->DriverAPI = driDriverAPI;
 897     psp->api_mask = (1 << __DRI_API_OPENGL);
 898     *driver_configs = driDriverAPI.InitScreen2(psp);
 899     if (*driver_configs == NULL) {
 900         free(psp);
 901         return NULL;
 902     }
 903
 904     psp->DriverAPI = driDriverAPI;
 905     psp->loaderPrivate = data;
 906
 907     driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions,
 908                        __dri2NConfigOptions);
 909     driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum,
 910                         "dri2");
 911
 912     return psp;
 913 }
 914
 915 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 916 {
 917     return psp->extensions;
 918 }
 919
 920 /** Core interface */
 921 const __DRIcoreExtension driCoreExtension = {
 922     { __DRI_CORE, __DRI_CORE_VERSION },
 923     NULL,
 924     driDestroyScreen,
 925     driGetExtensions,
 926     driGetConfigAttrib,
 927     driIndexConfigAttrib,
 928     NULL,
 929     driDestroyDrawable,
 930     driSwapBuffers,
 931     NULL,
 932     driCopyContext,
 933     driDestroyContext,
 934     driBindContext,
 935     driUnbindContext
 936 };
 937
 938 /** DRI2 interface */
 939 const __DRIdri2Extension driDRI2Extension = {
 940     { __DRI_DRI2, __DRI_DRI2_VERSION },
 941     dri2CreateNewScreen,
 942     dri2CreateNewDrawable,
 943     dri2CreateNewContext,
 944     dri2GetAPIMask,
 945     dri2CreateNewContextForAPI,
 946     dri2AllocateBuffer,
 947     dri2ReleaseBuffer
 948 };
 949
 950 const __DRI2configQueryExtension dri2ConfigQueryExtension = {
 951    { __DRI2_CONFIG_QUERY, __DRI2_CONFIG_QUERY_VERSION },
 952    dri2ConfigQueryb,
 953    dri2ConfigQueryi,
 954    dri2ConfigQueryf,
 955 };
 956
 957 /**
 958  * Calculate amount of swap interval used between GLX buffer swaps.
 959  *
 960  * The usage value, on the range [0,max], is the fraction of total swap
 961  * interval time used between GLX buffer swaps is calculated.
 962  *
 963  *            \f$p = t_d / (i * t_r)\f$
 964  *
 965  * Where \f$t_d\f$ is the time since the last GLX buffer swap, \f$i\f$ is the
 966  * swap interval (as set by \c glXSwapIntervalSGI), and \f$t_r\f$ time
 967  * required for a single vertical refresh period (as returned by \c
 968  * glXGetMscRateOML).
 969  *
 970  * See the documentation for the GLX_MESA_swap_frame_usage extension for more
 971  * details.
 972  *
 973  * \param   dPriv  Pointer to the private drawable structure.
 974  * \return  If less than a single swap interval time period was required
 975  *          between GLX buffer swaps, a number greater than 0 and less than
 976  *          1.0 is returned.  If exactly one swap interval time period is
 977  *          required, 1.0 is returned, and if more than one is required then
 978  *          a number greater than 1.0 will be returned.
 979  *
 980  * \sa glXSwapIntervalSGI glXGetMscRateOML
 981  *
 982  * \todo Instead of caching the \c glXGetMscRateOML function pointer, would it
 983  *       be possible to cache the sync rate?
 984  */
 985 float
 986 driCalculateSwapUsage( __DRIdrawable *dPriv, int64_t last_swap_ust,
 987                        int64_t current_ust )
 988 {
 989    int32_t   n;
 990    int32_t   d;
 991    int       interval;
 992    float     usage = 1.0;
 993    __DRIscreen *psp = dPriv->driScreenPriv;
 994
 995    if ( (*psp->systemTime->getMSCRate)(dPriv, &n, &d, dPriv->loaderPrivate) ) {
 996       interval = (dPriv->swap_interval != 0) ? dPriv->swap_interval : 1;
 997
 998
 999       /* We want to calculate
1000        * (current_UST - last_swap_UST) / (interval * us_per_refresh).  We get
1001        * current_UST by calling __glXGetUST.  last_swap_UST is stored in
1002        * dPriv->swap_ust.  interval has already been calculated.
1003        *
1004        * The only tricky part is us_per_refresh.  us_per_refresh is
1005        * 1000000 / MSC_rate.  We know the MSC_rate is n / d.  We can flip it
1006        * around and say us_per_refresh = 1000000 * d / n.  Since this goes in
1007        * the denominator of the final calculation, we calculate
1008        * (interval * 1000000 * d) and move n into the numerator.
1009        */
1010
1011       usage = (current_ust - last_swap_ust);
1012       usage *= n;
1013       usage /= (interval * d);
1014       usage /= 1000000.0;
1015    }
1016
1017    return usage;
1018 }
1019
1020 void
1021 dri2InvalidateDrawable(__DRIdrawable *drawable)
1022 {
1023     drawable->dri2.stamp++;
1024 }
1025
1026 /*@}*/