aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/mesa/drivers/dri/common/dri_util.c
blob: adc6716c6fab6b52d5740e7a9ff0e90fd030eacc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
/**
 * \file dri_util.c
 * DRI utility functions.
 *
 * This module acts as glue between GLX and the actual hardware driver.  A DRI
 * driver doesn't really \e have to use any of this - it's optional.  But, some
 * useful stuff is done here that otherwise would have to be duplicated in most
 * drivers.
 * 
 * Basically, these utility functions take care of some of the dirty details of
 * screen initialization, context creation, context binding, DRM setup, etc.
 *
 * These functions are compiled into each DRI driver so libGL.so knows nothing
 * about them.
 */


#include <assert.h>
#include <stdarg.h>
#include <unistd.h>
#include <sys/mman.h>
#include <stdio.h>

#ifndef MAP_FAILED
#define MAP_FAILED ((void *)-1)
#endif

#include "main/imports.h"
#define None 0

#include "dri_util.h"
#include "drm_sarea.h"
#include "utils.h"
#include "xmlpool.h"
#include "../glsl/glsl_parser_extras.h"

PUBLIC const char __dri2ConfigOptions[] =
   DRI_CONF_BEGIN
      DRI_CONF_SECTION_PERFORMANCE
         DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_1)
      DRI_CONF_SECTION_END
   DRI_CONF_END;

static const uint __dri2NConfigOptions = 1;

#ifndef GLX_OML_sync_control
typedef GLboolean ( * PFNGLXGETMSCRATEOMLPROC) (__DRIdrawable *drawable, int32_t *numerator, int32_t *denominator);
#endif

static void dri_get_drawable(__DRIdrawable *pdp);
static void dri_put_drawable(__DRIdrawable *pdp);

/**
 * This is just a token extension used to signal that the driver
 * supports setting a read drawable.
 */
const __DRIextension driReadDrawableExtension = {
    __DRI_READ_DRAWABLE, __DRI_READ_DRAWABLE_VERSION
};

GLint
driIntersectArea( drm_clip_rect_t rect1, drm_clip_rect_t rect2 )
{
   if (rect2.x1 > rect1.x1) rect1.x1 = rect2.x1;
   if (rect2.x2 < rect1.x2) rect1.x2 = rect2.x2;
   if (rect2.y1 > rect1.y1) rect1.y1 = rect2.y1;
   if (rect2.y2 < rect1.y2) rect1.y2 = rect2.y2;

   if (rect1.x1 > rect1.x2 || rect1.y1 > rect1.y2) return 0;

   return (rect1.x2 - rect1.x1) * (rect1.y2 - rect1.y1);
}

/*****************************************************************/
/** \name Context (un)binding functions                          */
/*****************************************************************/
/*@{*/

/**
 * Unbind context.
 * 
 * \param scrn the screen.
 * \param gc context.
 *
 * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
 * 
 * \internal
 * This function calls __DriverAPIRec::UnbindContext, and then decrements
 * __DRIdrawableRec::refcount which must be non-zero for a successful
 * return.
 * 
 * While casting the opaque private pointers associated with the parameters
 * into their respective real types it also assures they are not \c NULL. 
 */
static int driUnbindContext(__DRIcontext *pcp)
{
    __DRIscreen *psp;
    __DRIdrawable *pdp;
    __DRIdrawable *prp;

    /*
    ** Assume error checking is done properly in glXMakeCurrent before
    ** calling driUnbindContext.
    */

    if (pcp == NULL)
        return GL_FALSE;

    psp = pcp->driScreenPriv;
    pdp = pcp->driDrawablePriv;
    prp = pcp->driReadablePriv;

    /* already unbound */
    if (!pdp && !prp)
      return GL_TRUE;
    /* Let driver unbind drawable from context */
    (*psp->DriverAPI.UnbindContext)(pcp);

    assert(pdp);
    if (pdp->refcount == 0) {
	/* ERROR!!! */
	return GL_FALSE;
    }

    dri_put_drawable(pdp);

    if (prp != pdp) {
        if (prp->refcount == 0) {
	    /* ERROR!!! */
	    return GL_FALSE;
	}

    	dri_put_drawable(prp);
    }


    /* XXX this is disabled so that if we call SwapBuffers on an unbound
     * window we can determine the last context bound to the window and
     * use that context's lock. (BrianP, 2-Dec-2000)
     */
    pcp->driDrawablePriv = pcp->driReadablePriv = NULL;

    return GL_TRUE;
}

/**
 * This function takes both a read buffer and a draw buffer.  This is needed
 * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
 * function.
 */
static int driBindContext(__DRIcontext *pcp,
			  __DRIdrawable *pdp,
			  __DRIdrawable *prp)
{
    __DRIscreen *psp = NULL;

    /*
    ** Assume error checking is done properly in glXMakeCurrent before
    ** calling driUnbindContext.
    */

    if (!pcp)
	return GL_FALSE;

    /* Bind the drawable to the context */
    psp = pcp->driScreenPriv;
    pcp->driDrawablePriv = pdp;
    pcp->driReadablePriv = prp;
    if (pdp) {
	pdp->driContextPriv = pcp;
	dri_get_drawable(pdp);
    }
    if (prp && pdp != prp) {
	dri_get_drawable(prp);
    }

    /*
    ** Now that we have a context associated with this drawable, we can
    ** initialize the drawable information if has not been done before.
    */

    if (!psp->dri2.enabled) {
	if (pdp && !pdp->pStamp) {
	    DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
	    __driUtilUpdateDrawableInfo(pdp);
	    DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
	}
	if (prp && pdp != prp && !prp->pStamp) {
	    DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
	    __driUtilUpdateDrawableInfo(prp);
	    DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
        }
    }

    /* Call device-specific MakeCurrent */
    return (*psp->DriverAPI.MakeCurrent)(pcp, pdp, prp);
}

/*@}*/


/*****************************************************************/
/** \name Drawable handling functions                            */
/*****************************************************************/
/*@{*/

/**
 * Update private drawable information.
 *
 * \param pdp pointer to the private drawable information to update.
 * 
 * This function basically updates the __DRIdrawable struct's
 * cliprect information by calling \c __DRIinterfaceMethods::getDrawableInfo.
 * This is usually called by the DRI_VALIDATE_DRAWABLE_INFO macro which
 * compares the __DRIdrwablePrivate pStamp and lastStamp values.  If
 * the values are different that means we have to update the clipping
 * info.
 */
void
__driUtilUpdateDrawableInfo(__DRIdrawable *pdp)
{
    __DRIscreen *psp = pdp->driScreenPriv;
    __DRIcontext *pcp = pdp->driContextPriv;
    
    if (!pcp 
	|| ((pdp != pcp->driDrawablePriv) && (pdp != pcp->driReadablePriv))) {
	/* ERROR!!! 
	 * ...but we must ignore it. There can be many contexts bound to a
	 * drawable.
	 */
    }

    if (pdp->pClipRects) {
	free(pdp->pClipRects); 
	pdp->pClipRects = NULL;
    }

    if (pdp->pBackClipRects) {
	free(pdp->pBackClipRects); 
	pdp->pBackClipRects = NULL;
    }

    DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);

    if (! (*psp->getDrawableInfo->getDrawableInfo)(pdp,
			  &pdp->index, &pdp->lastStamp,
			  &pdp->x, &pdp->y, &pdp->w, &pdp->h,
			  &pdp->numClipRects, &pdp->pClipRects,
			  &pdp->backX,
			  &pdp->backY,
			  &pdp->numBackClipRects,
			  &pdp->pBackClipRects,
			  pdp->loaderPrivate)) {
	/* Error -- eg the window may have been destroyed.  Keep going
	 * with no cliprects.
	 */
        pdp->pStamp = &pdp->lastStamp; /* prevent endless loop */
	pdp->numClipRects = 0;
	pdp->pClipRects = NULL;
	pdp->numBackClipRects = 0;
	pdp->pBackClipRects = NULL;
    }
    else
       pdp->pStamp = &(psp->pSAREA->drawableTable[pdp->index].stamp);

    DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
}

/*@}*/

/*****************************************************************/
/** \name GLX callbacks                                          */
/*****************************************************************/
/*@{*/

static void driReportDamage(__DRIdrawable *pdp,
			    struct drm_clip_rect *pClipRects, int numClipRects)
{
    __DRIscreen *psp = pdp->driScreenPriv;

    /* Check that we actually have the new damage report method */
    if (psp->damage) {
	/* Report the damage.  Currently, all our drivers draw
	 * directly to the front buffer, so we report the damage there
	 * rather than to the backing storein (if any).
	 */
	(*psp->damage->reportDamage)(pdp,
				     pdp->x, pdp->y,
				     pClipRects, numClipRects,
				     GL_TRUE, pdp->loaderPrivate);
    }
}


/**
 * Swap buffers.
 *
 * \param drawablePrivate opaque pointer to the per-drawable private info.
 * 
 * \internal
 * This function calls __DRIdrawable::swapBuffers.
 * 
 * Is called directly from glXSwapBuffers().
 */
static void driSwapBuffers(__DRIdrawable *dPriv)
{
    __DRIscreen *psp = dPriv->driScreenPriv;
    drm_clip_rect_t *rects;
    int i;

    psp->DriverAPI.SwapBuffers(dPriv);

    if (!dPriv->numClipRects)
        return;

    rects = malloc(sizeof(*rects) * dPriv->numClipRects);

    if (!rects)
        return;

    for (i = 0; i < dPriv->numClipRects; i++) {
        rects[i].x1 = dPriv->pClipRects[i].x1 - dPriv->x;
        rects[i].y1 = dPriv->pClipRects[i].y1 - dPriv->y;
        rects[i].x2 = dPriv->pClipRects[i].x2 - dPriv->x;
        rects[i].y2 = dPriv->pClipRects[i].y2 - dPriv->y;
    }

    driReportDamage(dPriv, rects, dPriv->numClipRects);
    free(rects);
}

static int driDrawableGetMSC( __DRIscreen *sPriv, __DRIdrawable *dPriv,
			      int64_t *msc )
{
    return sPriv->DriverAPI.GetDrawableMSC(sPriv, dPriv, msc);
}


static int driWaitForMSC(__DRIdrawable *dPriv, int64_t target_msc,
			 int64_t divisor, int64_t remainder,
			 int64_t * msc, int64_t * sbc)
{
    __DRIswapInfo  sInfo;
    int  status;

    status = dPriv->driScreenPriv->DriverAPI.WaitForMSC( dPriv, target_msc,
                                                         divisor, remainder,
                                                         msc );

    /* GetSwapInfo() may not be provided by the driver if GLX_SGI_video_sync
     * is supported but GLX_OML_sync_control is not.  Therefore, don't return
     * an error value if GetSwapInfo() is not implemented.
    */
    if ( status == 0
         && dPriv->driScreenPriv->DriverAPI.GetSwapInfo ) {
        status = dPriv->driScreenPriv->DriverAPI.GetSwapInfo( dPriv, & sInfo );
        *sbc = sInfo.swap_count;
    }

    return status;
}


const __DRImediaStreamCounterExtension driMediaStreamCounterExtension = {
    { __DRI_MEDIA_STREAM_COUNTER, __DRI_MEDIA_STREAM_COUNTER_VERSION },
    driWaitForMSC,
    driDrawableGetMSC,
};


static void driCopySubBuffer(__DRIdrawable *dPriv,
			      int x, int y, int w, int h)
{
    drm_clip_rect_t rect;

    rect.x1 = x;
    rect.y1 = dPriv->h - y - h;
    rect.x2 = x + w;
    rect.y2 = rect.y1 + h;
    driReportDamage(dPriv, &rect, 1);

    dPriv->driScreenPriv->DriverAPI.CopySubBuffer(dPriv, x, y, w, h);
}

const __DRIcopySubBufferExtension driCopySubBufferExtension = {
    { __DRI_COPY_SUB_BUFFER, __DRI_COPY_SUB_BUFFER_VERSION },
    driCopySubBuffer
};

static void driSetSwapInterval(__DRIdrawable *dPriv, unsigned int interval)
{
    dPriv->swap_interval = interval;
}

static unsigned int driGetSwapInterval(__DRIdrawable *dPriv)
{
    return dPriv->swap_interval;
}

const __DRIswapControlExtension driSwapControlExtension = {
    { __DRI_SWAP_CONTROL, __DRI_SWAP_CONTROL_VERSION },
    driSetSwapInterval,
    driGetSwapInterval
};


/**
 * This is called via __DRIscreenRec's createNewDrawable pointer.
 */
static __DRIdrawable *
driCreateNewDrawable(__DRIscreen *psp, const __DRIconfig *config,
		     drm_drawable_t hwDrawable, int renderType,
		     const int *attrs, void *data)
{
    __DRIdrawable *pdp;

    /* Since pbuffers are not yet supported, no drawable attributes are
     * supported either.
     */
    (void) attrs;
    (void) renderType;

    pdp = malloc(sizeof *pdp);
    if (!pdp) {
	return NULL;
    }

    pdp->driContextPriv = NULL;
    pdp->loaderPrivate = data;
    pdp->hHWDrawable = hwDrawable;
    pdp->refcount = 1;
    pdp->pStamp = NULL;
    pdp->lastStamp = 0;
    pdp->index = 0;
    pdp->x = 0;
    pdp->y = 0;
    pdp->w = 0;
    pdp->h = 0;
    pdp->numClipRects = 0;
    pdp->numBackClipRects = 0;
    pdp->pClipRects = NULL;
    pdp->pBackClipRects = NULL;
    pdp->vblSeq = 0;
    pdp->vblFlags = 0;

    pdp->driScreenPriv = psp;

    if (!(*psp->DriverAPI.CreateBuffer)(psp, pdp, &config->modes, 0)) {
       free(pdp);
       return NULL;
    }

    pdp->msc_base = 0;

    /* This special default value is replaced with the configured
     * default value when the drawable is first bound to a direct
     * rendering context. 
     */
    pdp->swap_interval = (unsigned)-1;

    return pdp;
}


static __DRIdrawable *
dri2CreateNewDrawable(__DRIscreen *screen,
		      const __DRIconfig *config,
		      void *loaderPrivate)
{
    __DRIdrawable *pdraw;

    pdraw = driCreateNewDrawable(screen, config, 0, 0, NULL, loaderPrivate);
    if (!pdraw)
    	return NULL;

    pdraw->pClipRects = &pdraw->dri2.clipRect;
    pdraw->pBackClipRects = &pdraw->dri2.clipRect;

    pdraw->pStamp = &pdraw->dri2.stamp;
    *pdraw->pStamp = pdraw->lastStamp + 1;

    return pdraw;
}

static __DRIbuffer *
dri2AllocateBuffer(__DRIscreen *screen,
		   unsigned int attachment, unsigned int format,
		   int width, int height)
{
    return (*screen->DriverAPI.AllocateBuffer)(screen, attachment, format,
					       width, height);
}

static void
dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
{
   (*screen->DriverAPI.ReleaseBuffer)(screen, buffer);
}


static int
dri2ConfigQueryb(__DRIscreen *screen, const char *var, GLboolean *val)
{
   if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
      return -1;

   *val = driQueryOptionb(&screen->optionCache, var);

   return 0;
}

static int
dri2ConfigQueryi(__DRIscreen *screen, const char *var, GLint *val)
{
   if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
       !driCheckOption(&screen->optionCache, var, DRI_ENUM))
      return -1;

    *val = driQueryOptioni(&screen->optionCache, var);

    return 0;
}

static int
dri2ConfigQueryf(__DRIscreen *screen, const char *var, GLfloat *val)
{
   if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
      return -1;

    *val = driQueryOptionf(&screen->optionCache, var);

    return 0;
}


static void dri_get_drawable(__DRIdrawable *pdp)
{
    pdp->refcount++;
}
	
static void dri_put_drawable(__DRIdrawable *pdp)
{
    __DRIscreen *psp;

    if (pdp) {
	pdp->refcount--;
	if (pdp->refcount)
	    return;

	psp = pdp->driScreenPriv;
        (*psp->DriverAPI.DestroyBuffer)(pdp);
	if (pdp->pClipRects && pdp->pClipRects != &pdp->dri2.clipRect) {
	    free(pdp->pClipRects);
	    pdp->pClipRects = NULL;
	}
	if (pdp->pBackClipRects && pdp->pClipRects != &pdp->dri2.clipRect) {
	    free(pdp->pBackClipRects);
	    pdp->pBackClipRects = NULL;
	}
	free(pdp);
    }
}

static void
driDestroyDrawable(__DRIdrawable *pdp)
{
    dri_put_drawable(pdp);
}

/*@}*/


/*****************************************************************/
/** \name Context handling functions                             */
/*****************************************************************/
/*@{*/

/**
 * Destroy the per-context private information.
 * 
 * \internal
 * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
 * drmDestroyContext(), and finally frees \p contextPrivate.
 */
static void
driDestroyContext(__DRIcontext *pcp)
{
    if (pcp) {
	(*pcp->driScreenPriv->DriverAPI.DestroyContext)(pcp);
	free(pcp);
    }
}


/**
 * Create the per-drawable private driver information.
 * 
 * \param render_type   Type of rendering target.  \c GLX_RGBA_TYPE is the only
 *                      type likely to ever be supported for direct-rendering.
 *                      However, \c GLX_RGBA_FLOAT_TYPE_ARB may eventually be
 *                      supported by some drivers.
 * \param shared        Context with which to share textures, etc. or NULL
 *
 * \returns An opaque pointer to the per-context private information on
 *          success, or \c NULL on failure.
 * 
 * \internal
 * This function allocates and fills a __DRIcontextRec structure.  It
 * performs some device independent initialization and passes all the
 * relevent information to __DriverAPIRec::CreateContext to create the
 * context.
 *
 */
static __DRIcontext *
driCreateNewContext(__DRIscreen *psp, const __DRIconfig *config,
		    int render_type, __DRIcontext *shared, 
		    drm_context_t hwContext, void *data)
{
    __DRIcontext *pcp;
    void * const shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;

    (void) render_type;

    pcp = malloc(sizeof *pcp);
    if (!pcp)
	return NULL;

    pcp->driScreenPriv = psp;
    pcp->driDrawablePriv = NULL;
    pcp->loaderPrivate = data;
    
    pcp->dri2.draw_stamp = 0;
    pcp->dri2.read_stamp = 0;

    pcp->hHWContext = hwContext;

    if ( !(*psp->DriverAPI.CreateContext)(API_OPENGL,
					  &config->modes, pcp, shareCtx) ) {
        free(pcp);
        return NULL;
    }

    return pcp;
}

static unsigned int
dri2GetAPIMask(__DRIscreen *screen)
{
    return screen->api_mask;
}

static __DRIcontext *
dri2CreateNewContextForAPI(__DRIscreen *screen, int api,
			   const __DRIconfig *config,
			   __DRIcontext *shared, void *data)
{
    __DRIcontext *context;
    const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
    void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
    gl_api mesa_api;

    if (!(screen->api_mask & (1 << api)))
	return NULL;

    switch (api) {
    case __DRI_API_OPENGL:
	    mesa_api = API_OPENGL;
	    break;
    case __DRI_API_GLES:
	    mesa_api = API_OPENGLES;
	    break;
    case __DRI_API_GLES2:
	    mesa_api = API_OPENGLES2;
	    break;
    default:
	    return NULL;
    }

    context = malloc(sizeof *context);
    if (!context)
	return NULL;

    context->driScreenPriv = screen;
    context->driDrawablePriv = NULL;
    context->loaderPrivate = data;
    
    if (!(*screen->DriverAPI.CreateContext)(mesa_api, modes,
					    context, shareCtx) ) {
        free(context);
        return NULL;
    }

    return context;
}


static __DRIcontext *
dri2CreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
		      __DRIcontext *shared, void *data)
{
   return dri2CreateNewContextForAPI(screen, __DRI_API_OPENGL,
				     config, shared, data);
}

static int
driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
{
    (void) dest;
    (void) src;
    (void) mask;
    return GL_FALSE;
}

/*@}*/


/*****************************************************************/
/** \name Screen handling functions                              */
/*****************************************************************/
/*@{*/

/**
 * Destroy the per-screen private information.
 * 
 * \internal
 * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
 * drmClose(), and finally frees \p screenPrivate.
 */
static void driDestroyScreen(__DRIscreen *psp)
{
    if (psp) {
	/* No interaction with the X-server is possible at this point.  This
	 * routine is called after XCloseDisplay, so there is no protocol
	 * stream open to the X-server anymore.
	 */

       _mesa_destroy_shader_compiler();

	if (psp->DriverAPI.DestroyScreen)
	    (*psp->DriverAPI.DestroyScreen)(psp);

	if (!psp->dri2.enabled) {
	   (void)drmUnmap((drmAddress)psp->pSAREA, SAREA_MAX);
	   (void)drmUnmap((drmAddress)psp->pFB, psp->fbSize);
	   (void)drmCloseOnce(psp->fd);
	} else {
	   driDestroyOptionCache(&psp->optionCache);
	   driDestroyOptionInfo(&psp->optionInfo);
	}

	free(psp);
    }
}

static void
setupLoaderExtensions(__DRIscreen *psp,
		      const __DRIextension **extensions)
{
    int i;

    for (i = 0; extensions[i]; i++) {
	if (strcmp(extensions[i]->name, __DRI_GET_DRAWABLE_INFO) == 0)
	    psp->getDrawableInfo = (__DRIgetDrawableInfoExtension *) extensions[i];
	if (strcmp(extensions[i]->name, __DRI_DAMAGE) == 0)
	    psp->damage = (__DRIdamageExtension *) extensions[i];
	if (strcmp(extensions[i]->name, __DRI_SYSTEM_TIME) == 0)
	    psp->systemTime = (__DRIsystemTimeExtension *) extensions[i];
	if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
	    psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
	if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)
	    psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];
	if (strcmp(extensions[i]->name, __DRI_USE_INVALIDATE) == 0)
	    psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];
    }
}

/**
 * This is the bootstrap function for the driver.  libGL supplies all of the
 * requisite information about the system, and the driver initializes itself.
 * This routine also fills in the linked list pointed to by \c driver_modes
 * with the \c struct gl_config that the driver can support for windows or
 * pbuffers.
 *
 * For legacy DRI.
 * 
 * \param scrn  Index of the screen
 * \param ddx_version Version of the 2D DDX.  This may not be meaningful for
 *                    all drivers.
 * \param dri_version Version of the "server-side" DRI.
 * \param drm_version Version of the kernel DRM.
 * \param frame_buffer Data describing the location and layout of the
 *                     framebuffer.
 * \param pSAREA       Pointer to the SAREA.
 * \param fd           Device handle for the DRM.
 * \param extensions   ??
 * \param driver_modes  Returns modes suppoted by the driver
 * \param loaderPrivate  ??
 * 
 * \note There is no need to check the minimum API version in this
 * function.  Since the name of this function is versioned, it is
 * impossible for a loader that is too old to even load this driver.
 */
static __DRIscreen *
driCreateNewScreen(int scrn,
		   const __DRIversion *ddx_version,
		   const __DRIversion *dri_version,
		   const __DRIversion *drm_version,
		   const __DRIframebuffer *frame_buffer,
		   drmAddress pSAREA, int fd, 
		   const __DRIextension **extensions,
		   const __DRIconfig ***driver_modes,
		   void *loaderPrivate)
{
    static const __DRIextension *emptyExtensionList[] = { NULL };
    __DRIscreen *psp;

    (void) loaderPrivate;

    if (driDriverAPI.InitScreen == NULL)
	return NULL;

    psp = calloc(1, sizeof *psp);
    if (!psp)
	return NULL;

    setupLoaderExtensions(psp, extensions);

    /*
    ** NOT_DONE: This is used by the X server to detect when the client
    ** has died while holding the drawable lock.  The client sets the
    ** drawable lock to this value.
    */
    psp->drawLockID = 1;

    psp->drm_version = *drm_version;
    psp->ddx_version = *ddx_version;
    psp->dri_version = *dri_version;

    psp->pSAREA = pSAREA;
    psp->lock = (drmLock *) &psp->pSAREA->lock;

    psp->pFB = frame_buffer->base;
    psp->fbSize = frame_buffer->size;
    psp->fbStride = frame_buffer->stride;
    psp->fbWidth = frame_buffer->width;
    psp->fbHeight = frame_buffer->height;
    psp->devPrivSize = frame_buffer->dev_priv_size;
    psp->pDevPriv = frame_buffer->dev_priv;
    psp->fbBPP = psp->fbStride * 8 / frame_buffer->width;

    psp->extensions = emptyExtensionList;
    psp->fd = fd;
    psp->myNum = scrn;
    psp->dri2.enabled = GL_FALSE;

    psp->DriverAPI = driDriverAPI;
    psp->api_mask = (1 << __DRI_API_OPENGL);

    *driver_modes = driDriverAPI.InitScreen(psp);
    if (*driver_modes == NULL) {
	free(psp);
	return NULL;
    }

    return psp;
}

/**
 * DRI2
 */
static __DRIscreen *
dri2CreateNewScreen(int scrn, int fd,
		    const __DRIextension **extensions,
		    const __DRIconfig ***driver_configs, void *data)
{
    static const __DRIextension *emptyExtensionList[] = { NULL };
    __DRIscreen *psp;
    drmVersionPtr version;

    if (driDriverAPI.InitScreen2 == NULL)
        return NULL;

    psp = calloc(1, sizeof(*psp));
    if (!psp)
	return NULL;

    setupLoaderExtensions(psp, extensions);

    version = drmGetVersion(fd);
    if (version) {
	psp->drm_version.major = version->version_major;
	psp->drm_version.minor = version->version_minor;
	psp->drm_version.patch = version->version_patchlevel;
	drmFreeVersion(version);
    }

    psp->extensions = emptyExtensionList;
    psp->fd = fd;
    psp->myNum = scrn;
    psp->dri2.enabled = GL_TRUE;

    psp->DriverAPI = driDriverAPI;
    psp->api_mask = (1 << __DRI_API_OPENGL);
    *driver_configs = driDriverAPI.InitScreen2(psp);
    if (*driver_configs == NULL) {
	free(psp);
	return NULL;
    }

    psp->DriverAPI = driDriverAPI;
    psp->loaderPrivate = data;

    driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions,
		       __dri2NConfigOptions);
    driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum,
			"dri2");

    return psp;
}

static const __DRIextension **driGetExtensions(__DRIscreen *psp)
{
    return psp->extensions;
}

/** Core interface */
const __DRIcoreExtension driCoreExtension = {
    { __DRI_CORE, __DRI_CORE_VERSION },
    NULL,
    driDestroyScreen,
    driGetExtensions,
    driGetConfigAttrib,
    driIndexConfigAttrib,
    NULL,
    driDestroyDrawable,
    driSwapBuffers,
    NULL,
    driCopyContext,
    driDestroyContext,
    driBindContext,
    driUnbindContext
};

/** Legacy DRI interface */
const __DRIlegacyExtension driLegacyExtension = {
    { __DRI_LEGACY, __DRI_LEGACY_VERSION },
    driCreateNewScreen,
    driCreateNewDrawable,
    driCreateNewContext,
};

/** DRI2 interface */
const __DRIdri2Extension driDRI2Extension = {
    { __DRI_DRI2, __DRI_DRI2_VERSION },
    dri2CreateNewScreen,
    dri2CreateNewDrawable,
    dri2CreateNewContext,
    dri2GetAPIMask,
    dri2CreateNewContextForAPI,
    dri2AllocateBuffer,
    dri2ReleaseBuffer
};

const __DRI2configQueryExtension dri2ConfigQueryExtension = {
   { __DRI2_CONFIG_QUERY, __DRI2_CONFIG_QUERY_VERSION },
   dri2ConfigQueryb,
   dri2ConfigQueryi,
   dri2ConfigQueryf,
};

/**
 * Calculate amount of swap interval used between GLX buffer swaps.
 * 
 * The usage value, on the range [0,max], is the fraction of total swap
 * interval time used between GLX buffer swaps is calculated.
 *
 *            \f$p = t_d / (i * t_r)\f$
 * 
 * Where \f$t_d\f$ is the time since the last GLX buffer swap, \f$i\f$ is the
 * swap interval (as set by \c glXSwapIntervalSGI), and \f$t_r\f$ time
 * required for a single vertical refresh period (as returned by \c
 * glXGetMscRateOML).
 * 
 * See the documentation for the GLX_MESA_swap_frame_usage extension for more
 * details.
 *
 * \param   dPriv  Pointer to the private drawable structure.
 * \return  If less than a single swap interval time period was required
 *          between GLX buffer swaps, a number greater than 0 and less than
 *          1.0 is returned.  If exactly one swap interval time period is
 *          required, 1.0 is returned, and if more than one is required then
 *          a number greater than 1.0 will be returned.
 *
 * \sa glXSwapIntervalSGI glXGetMscRateOML
 * 
 * \todo Instead of caching the \c glXGetMscRateOML function pointer, would it
 *       be possible to cache the sync rate?
 */
float
driCalculateSwapUsage( __DRIdrawable *dPriv, int64_t last_swap_ust,
		       int64_t current_ust )
{
   int32_t   n;
   int32_t   d;
   int       interval;
   float     usage = 1.0;
   __DRIscreen *psp = dPriv->driScreenPriv;

   if ( (*psp->systemTime->getMSCRate)(dPriv, &n, &d, dPriv->loaderPrivate) ) {
      interval = (dPriv->swap_interval != 0) ? dPriv->swap_interval : 1;


      /* We want to calculate
       * (current_UST - last_swap_UST) / (interval * us_per_refresh).  We get
       * current_UST by calling __glXGetUST.  last_swap_UST is stored in
       * dPriv->swap_ust.  interval has already been calculated.
       *
       * The only tricky part is us_per_refresh.  us_per_refresh is
       * 1000000 / MSC_rate.  We know the MSC_rate is n / d.  We can flip it
       * around and say us_per_refresh = 1000000 * d / n.  Since this goes in
       * the denominator of the final calculation, we calculate
       * (interval * 1000000 * d) and move n into the numerator.
       */

      usage = (current_ust - last_swap_ust);
      usage *= n;
      usage /= (interval * d);
      usage /= 1000000.0;
   }
   
   return usage;
}

void
dri2InvalidateDrawable(__DRIdrawable *drawable)
{
    drawable->dri2.stamp++;
}

/*@}*/