aboutsummaryrefslogtreecommitdiff
path: root/nx-X11/programs/Xserver/GL/mesa/X/xf86glx.c
blob: 19b5be637870449554889517dbbf900bf467b748 (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
/* $XFree86: xc/programs/Xserver/GL/mesa/src/X/xf86glx.c,v 1.19 2003/07/16 01:38:27 dawes Exp $ */
/**************************************************************************

Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
All Rights Reserved.

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sub license, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice (including the
next paragraph) shall be included in all copies or substantial portions
of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

**************************************************************************/

/*
 * Authors:
 *   Kevin E. Martin <kevin@precisioninsight.com>
 *   Brian E. Paul <brian@precisioninsight.com>
 *
 */

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include <regionstr.h>
#include <resource.h>
#include <GL/gl.h>
#include <GL/glxint.h>
#include <GL/glxtokens.h>
#include <scrnintstr.h>
#include <config.h>
#include <glxserver.h>
#include <glxscreens.h>
#include <glxdrawable.h>
#include <glxcontext.h>
#include <glxext.h>
#include <glxutil.h>
#include "xf86glxint.h"
#include "context.h"
#include "xmesaP.h"
#include <GL/xf86glx.h>
#include "context.h"

/*
 * This define is for the glcore.h header file.
 * If you add it here, then make sure you also add it in
 * ../../../glx/Imakefile.
 */
#if 0
#define DEBUG
#include <GL/internal/glcore.h>
#undef DEBUG
#else
#include <GL/internal/glcore.h>
#endif

#include "glcontextmodes.h"

#ifdef NXAGENT_SERVER
#include "../main/WSDrawBuffer.h"
#endif

/*
 * This structure is statically allocated in the __glXScreens[]
 * structure.  This struct is not used anywhere other than in
 * __glXScreenInit to initialize each of the active screens
 * (__glXActiveScreens[]).  Several of the fields must be initialized by
 * the screenProbe routine before they are copied to the active screens
 * struct.  In particular, the contextCreate, pGlxVisual, numVisuals,
 * and numUsableVisuals fields must be initialized.
 */
static __GLXscreenInfo __glDDXScreenInfo = {
    __MESA_screenProbe,   /* Must be generic and handle all screens */
    __MESA_createContext, /* Substitute screen's createContext routine */
    __MESA_createBuffer,  /* Substitute screen's createBuffer routine */
    NULL,                 /* Set up modes in probe */
    NULL,                 /* Set up pVisualPriv in probe */
    0,                    /* Set up numVisuals in probe */
    0,                    /* Set up numUsableVisuals in probe */
    NULL,                 /* GLextensions is overwritten by __glXScreenInit */
    "Vendor String",      /* GLXvendor is overwritten by __glXScreenInit */
    "Version String",     /* GLXversion is overwritten by __glXScreenInit */
    "Extensions String",  /* GLXextensions is overwritten by __glXScreenInit */
    NULL                  /* WrappedPositionWindow is overwritten */
};

#ifdef NXAGENT_SERVER
WSDrawBufferPtr pWSDrawBuffer = NULL;

void AddWSDrawBuffer(GLframebuffer *mesa_buffer)
{
  WSDrawBufferPtr prevWSDB;
  WSDrawBufferPtr newWSDB;
  WSDrawBufferPtr p;

  prevWSDB = NULL;
  newWSDB = NULL;
  p = pWSDrawBuffer;
  while (p != NULL) {
    prevWSDB = p;
    if (prevWSDB -> DrawBuffer == mesa_buffer) {
      return;
    }
    p = p -> next;
  }
  newWSDB = malloc(sizeof(WSDrawBufferRec));
  newWSDB -> DrawBuffer = mesa_buffer;
  newWSDB -> next = NULL;

  if (pWSDrawBuffer == NULL)
    pWSDrawBuffer = newWSDB;
  else
    prevWSDB -> next = newWSDB;
}
#endif

void *__glXglDDXScreenInfo(void) {
    return &__glDDXScreenInfo;
}

static __GLXextensionInfo __glDDXExtensionInfo = {
    GL_CORE_MESA,
    __MESA_resetExtension,
    __MESA_initVisuals,
    __MESA_setVisualConfigs
};

void *__glXglDDXExtensionInfo(void) {
    return &__glDDXExtensionInfo;
}

static __MESA_screen  MESAScreens[MAXSCREENS];
static __GLcontext   *MESA_CC        = NULL;

static int                 numConfigs     = 0;
static __GLXvisualConfig  *visualConfigs  = NULL;
static void              **visualPrivates = NULL;


static int count_bits(unsigned int n)
{
   int bits = 0;

   while (n > 0) {
      if (n & 1) bits++;
      n >>= 1;
   }
   return bits;
}


static XMesaVisual find_mesa_visual(int screen, VisualID vid)
{
    __MESA_screen * const pMScr = &MESAScreens[screen];
    const __GLcontextModes *modes;
    unsigned i = 0;

    for ( modes = pMScr->modes ; modes != NULL ; modes = modes->next ) {
	if ( modes->visualID == vid ) {
	    break;
	}

	i++;
    }

    return (modes != NULL) ? pMScr->xm_vis[i] : NULL;
}


/*
 * In the case the driver defines no GLX visuals we'll use these.
 * Note that for TrueColor and DirectColor visuals, bufferSize is the 
 * sum of redSize, greenSize, blueSize and alphaSize, which may be larger 
 * than the nplanes/rootDepth of the server's X11 visuals
 */
#define NUM_FALLBACK_CONFIGS 5
static __GLXvisualConfig FallbackConfigs[NUM_FALLBACK_CONFIGS] = {
  /* [0] = RGB, double buffered, Z */
  {
    -1,                 /* vid */
    -1,                 /* class */
    True,               /* rgba */
    -1, -1, -1, 0,      /* rgba sizes */
    -1, -1, -1, 0,      /* rgba masks */
     0,  0,  0, 0,      /* rgba accum sizes */
    True,               /* doubleBuffer */
    False,              /* stereo */
    -1,                 /* bufferSize */
    16,                 /* depthSize */
    0,                  /* stencilSize */
    0,                  /* auxBuffers */
    0,                  /* level */
    GLX_NONE,           /* visualRating */
    GLX_NONE,           /* transparentPixel */
    0, 0, 0, 0,         /* transparent rgba color (floats scaled to ints) */
    0                   /* transparentIndex */
  },
  /* [1] = RGB, double buffered, Z, stencil, accum */
  {
    -1,                 /* vid */
    -1,                 /* class */
    True,               /* rgba */
    -1, -1, -1, 0,      /* rgba sizes */
    -1, -1, -1, 0,      /* rgba masks */
    16, 16, 16, 0,      /* rgba accum sizes */
    True,               /* doubleBuffer */
    False,              /* stereo */
    -1,                 /* bufferSize */
    16,                 /* depthSize */
    8,                  /* stencilSize */
    0,                  /* auxBuffers */
    0,                  /* level */
    GLX_NONE,           /* visualRating */
    GLX_NONE,           /* transparentPixel */
    0, 0, 0, 0,         /* transparent rgba color (floats scaled to ints) */
    0                   /* transparentIndex */
  },
  /* [2] = RGB+Alpha, double buffered, Z, stencil, accum */
  {
    -1,                 /* vid */
    -1,                 /* class */
    True,               /* rgba */
    -1, -1, -1, 8,      /* rgba sizes */
    -1, -1, -1, -1,     /* rgba masks */
    16, 16, 16, 16,     /* rgba accum sizes */
    True,               /* doubleBuffer */
    False,              /* stereo */
    -1,                 /* bufferSize */
    16,                 /* depthSize */
    8,                  /* stencilSize */
    0,                  /* auxBuffers */
    0,                  /* level */
    GLX_NONE,           /* visualRating */
    GLX_NONE,           /* transparentPixel */
    0, 0, 0, 0,         /* transparent rgba color (floats scaled to ints) */
    0                   /* transparentIndex */
  },
  /* [3] = RGB+Alpha, single buffered, Z, stencil, accum */
  {
    -1,                 /* vid */
    -1,                 /* class */
    True,               /* rgba */
    -1, -1, -1, 8,      /* rgba sizes */
    -1, -1, -1, -1,     /* rgba masks */
    16, 16, 16, 16,     /* rgba accum sizes */
    False,              /* doubleBuffer */
    False,              /* stereo */
    -1,                 /* bufferSize */
    16,                 /* depthSize */
    8,                  /* stencilSize */
    0,                  /* auxBuffers */
    0,                  /* level */
    GLX_NONE,           /* visualRating */
    GLX_NONE,           /* transparentPixel */
    0, 0, 0, 0,         /* transparent rgba color (floats scaled to ints) */
    0                   /* transparentIndex */
  },
  /* [4] = CI, double buffered, Z */
  {
    -1,                 /* vid */
    -1,                 /* class */
    False,              /* rgba? (false = color index) */
    -1, -1, -1, 0,      /* rgba sizes */
    -1, -1, -1, 0,      /* rgba masks */
     0,  0,  0, 0,      /* rgba accum sizes */
    True,               /* doubleBuffer */
    False,              /* stereo */
    -1,                 /* bufferSize */
    16,                 /* depthSize */
    0,                  /* stencilSize */
    0,                  /* auxBuffers */
    0,                  /* level */
    GLX_NONE,           /* visualRating */
    GLX_NONE,           /* transparentPixel */
    0, 0, 0, 0,         /* transparent rgba color (floats scaled to ints) */
    0                   /* transparentIndex */
  },
};


static Bool init_visuals(int *nvisualp, VisualPtr *visualp,
			 VisualID *defaultVisp,
			 int ndepth, DepthPtr pdepth,
			 int rootDepth)
{
    int numRGBconfigs;
    int numCIconfigs;
    int numVisuals = *nvisualp;
    int numNewVisuals;
    int numNewConfigs;
    VisualPtr pVisual = *visualp;
    VisualPtr pVisualNew = NULL;
    VisualID *orig_vid = NULL;
    __GLcontextModes *modes;
    __GLXvisualConfig *pNewVisualConfigs = NULL;
    void **glXVisualPriv;
    void **pNewVisualPriv;
    int found_default;
    int i, j, k;

    if (numConfigs > 0)
        numNewConfigs = numConfigs;
    else
        numNewConfigs = NUM_FALLBACK_CONFIGS;

    /* Alloc space for the list of new GLX visuals */
    pNewVisualConfigs = (__GLXvisualConfig *)
                     __glXMalloc(numNewConfigs * sizeof(__GLXvisualConfig));
    if (!pNewVisualConfigs) {
	return FALSE;
    }

    /* Alloc space for the list of new GLX visual privates */
    pNewVisualPriv = (void **) __glXMalloc(numNewConfigs * sizeof(void *));
    if (!pNewVisualPriv) {
	__glXFree(pNewVisualConfigs);
	return FALSE;
    }

    /*
    ** If SetVisualConfigs was not called, then use default GLX
    ** visual configs.
    */
    if (numConfigs == 0) {
	memcpy(pNewVisualConfigs, FallbackConfigs,
               NUM_FALLBACK_CONFIGS * sizeof(__GLXvisualConfig));
	memset(pNewVisualPriv, 0, NUM_FALLBACK_CONFIGS * sizeof(void *));
    }
    else {
        /* copy driver's visual config info */
        for (i = 0; i < numConfigs; i++) {
            pNewVisualConfigs[i] = visualConfigs[i];
            pNewVisualPriv[i] = visualPrivates[i];
        }
    }

    /* Count the number of RGB and CI visual configs */
    numRGBconfigs = 0;
    numCIconfigs = 0;
    for (i = 0; i < numNewConfigs; i++) {
	if (pNewVisualConfigs[i].rgba)
	    numRGBconfigs++;
	else
	    numCIconfigs++;
    }

    /* Count the total number of visuals to compute */
    numNewVisuals = 0;
    for (i = 0; i < numVisuals; i++) {
        numNewVisuals +=
	    (pVisual[i].class == TrueColor || pVisual[i].class == DirectColor)
	    ? numRGBconfigs : numCIconfigs;
    }

    /* Reset variables for use with the next screen/driver's visual configs */
    visualConfigs = NULL;
    numConfigs = 0;

    /* Alloc temp space for the list of orig VisualIDs for each new visual */
    orig_vid = (VisualID *)__glXMalloc(numNewVisuals * sizeof(VisualID));
    if (!orig_vid) {
	__glXFree(pNewVisualPriv);
	__glXFree(pNewVisualConfigs);
	return FALSE;
    }

    /* Alloc space for the list of glXVisuals */
    modes = _gl_context_modes_create(numNewVisuals, sizeof(__GLcontextModes));
    if (modes == NULL) {
	__glXFree(orig_vid);
	__glXFree(pNewVisualPriv);
	__glXFree(pNewVisualConfigs);
	return FALSE;
    }

    /* Alloc space for the list of glXVisualPrivates */
    glXVisualPriv = (void **)__glXMalloc(numNewVisuals * sizeof(void *));
    if (!glXVisualPriv) {
	_gl_context_modes_destroy( modes );
	__glXFree(orig_vid);
	__glXFree(pNewVisualPriv);
	__glXFree(pNewVisualConfigs);
	return FALSE;
    }

    /* Alloc space for the new list of the X server's visuals */
    pVisualNew = (VisualPtr)__glXMalloc(numNewVisuals * sizeof(VisualRec));
    if (!pVisualNew) {
	__glXFree(glXVisualPriv);
	_gl_context_modes_destroy( modes );
	__glXFree(orig_vid);
	__glXFree(pNewVisualPriv);
	__glXFree(pNewVisualConfigs);
	return FALSE;
    }

    /* Initialize the new visuals */
    found_default = FALSE;
    MESAScreens[screenInfo.numScreens-1].modes = modes;
    for (i = j = 0; i < numVisuals; i++) {
        int is_rgb = (pVisual[i].class == TrueColor ||
		      pVisual[i].class == DirectColor);

	for (k = 0; k < numNewConfigs; k++) {
	    if (pNewVisualConfigs[k].rgba != is_rgb)
		continue;

	    assert( modes != NULL );

	    /* Initialize the new visual */
	    pVisualNew[j] = pVisual[i];
	    pVisualNew[j].vid = FakeClientID(0);

	    /* Check for the default visual */
	    if (!found_default && pVisual[i].vid == *defaultVisp) {
		*defaultVisp = pVisualNew[j].vid;
		found_default = TRUE;
	    }

	    /* Save the old VisualID */
	    orig_vid[j] = pVisual[i].vid;

	    /* Initialize the glXVisual */
	    _gl_copy_visual_to_context_mode( modes, & pNewVisualConfigs[k] );
	    modes->visualID = pVisualNew[j].vid;

	    /*
	     * If the class is -1, then assume the X visual information
	     * is identical to what GLX needs, and take them from the X
	     * visual.  NOTE: if class != -1, then all other fields MUST
	     * be initialized.
	     */
	    if (modes->visualType == GLX_NONE) {
		modes->visualType = _gl_convert_from_x_visual_type( pVisual[i].class );
		modes->redBits    = count_bits(pVisual[i].redMask);
		modes->greenBits  = count_bits(pVisual[i].greenMask);
		modes->blueBits   = count_bits(pVisual[i].blueMask);
		modes->alphaBits  = modes->alphaBits;
		modes->redMask    = pVisual[i].redMask;
		modes->greenMask  = pVisual[i].greenMask;
		modes->blueMask   = pVisual[i].blueMask;
		modes->alphaMask  = modes->alphaMask;
		modes->rgbBits = (is_rgb)
		    ? (modes->redBits + modes->greenBits +
		       modes->blueBits + modes->alphaBits)
		    : rootDepth;
	    }

	    /* Save the device-dependent private for this visual */
	    glXVisualPriv[j] = pNewVisualPriv[k];

	    j++;
	    modes = modes->next;
	}
    }

    assert(j <= numNewVisuals);

    /* Save the GLX visuals in the screen structure */
    MESAScreens[screenInfo.numScreens-1].num_vis = numNewVisuals;
    MESAScreens[screenInfo.numScreens-1].private = glXVisualPriv;

    /* Set up depth's VisualIDs */
    for (i = 0; i < ndepth; i++) {
	int numVids = 0;
	VisualID *pVids = NULL;
	int k, n = 0;

	/* Count the new number of VisualIDs at this depth */
	for (j = 0; j < pdepth[i].numVids; j++)
	    for (k = 0; k < numNewVisuals; k++)
		if (pdepth[i].vids[j] == orig_vid[k])
		    numVids++;

	/* Allocate a new list of VisualIDs for this depth */
	pVids = (VisualID *)__glXMalloc(numVids * sizeof(VisualID));

	/* Initialize the new list of VisualIDs for this depth */
	for (j = 0; j < pdepth[i].numVids; j++)
	    for (k = 0; k < numNewVisuals; k++)
		if (pdepth[i].vids[j] == orig_vid[k])
		    pVids[n++] = pVisualNew[k].vid;

	/* Update this depth's list of VisualIDs */
	__glXFree(pdepth[i].vids);
	pdepth[i].vids = pVids;
	pdepth[i].numVids = numVids;
    }

    /* Update the X server's visuals */
    *nvisualp = numNewVisuals;
    *visualp = pVisualNew;

    /* Free the old list of the X server's visuals */
    __glXFree(pVisual);

    /* Clean up temporary allocations */
    __glXFree(orig_vid);
    __glXFree(pNewVisualPriv);
    __glXFree(pNewVisualConfigs);

    /* Free the private list created by DDX HW driver */
    if (visualPrivates)
        xfree(visualPrivates);
    visualPrivates = NULL;

    return TRUE;
}

void __MESA_setVisualConfigs(int nconfigs, __GLXvisualConfig *configs,
			     void **privates)
{
    numConfigs = nconfigs;
    visualConfigs = configs;
    visualPrivates = privates;
}

Bool __MESA_initVisuals(VisualPtr *visualp, DepthPtr *depthp,
			int *nvisualp, int *ndepthp, int *rootDepthp,
			VisualID *defaultVisp, unsigned long sizes,
			int bitsPerRGB)
{
    /*
     * Setup the visuals supported by this particular screen.
     */
    return init_visuals(nvisualp, visualp, defaultVisp,
			*ndepthp, *depthp, *rootDepthp);
}

static void fixup_visuals(int screen)
{
    ScreenPtr pScreen = screenInfo.screens[screen];
    __MESA_screen *pMScr = &MESAScreens[screen];
    int j;
    __GLcontextModes *modes;

    for ( modes = pMScr->modes ; modes != NULL ; modes = modes->next ) {
	const int vis_class = _gl_convert_to_x_visual_type( modes->visualType );
	const int nplanes = (modes->rgbBits - modes->alphaBits);
	const VisualPtr pVis = pScreen->visuals;

	/* Find a visual that matches the GLX visual's class and size */
	for (j = 0; j < pScreen->numVisuals; j++) {
	    if (pVis[j].class == vis_class &&
		pVis[j].nplanes == nplanes) {

		/* Fixup the masks */
		modes->redMask   = pVis[j].redMask;
		modes->greenMask = pVis[j].greenMask;
		modes->blueMask  = pVis[j].blueMask;

		/* Recalc the sizes */
		modes->redBits   = count_bits(modes->redMask);
		modes->greenBits = count_bits(modes->greenMask);
		modes->blueBits  = count_bits(modes->blueMask);
	    }
	}
    }
}

static void init_screen_visuals(int screen)
{
    ScreenPtr pScreen = screenInfo.screens[screen];
    __GLcontextModes *modes;
    XMesaVisual *pXMesaVisual;
    int *used;
    int i, j;

    /* Alloc space for the list of XMesa visuals */
    pXMesaVisual = (XMesaVisual *)__glXMalloc(MESAScreens[screen].num_vis *
					      sizeof(XMesaVisual));
    __glXMemset(pXMesaVisual, 0,
		MESAScreens[screen].num_vis * sizeof(XMesaVisual));

    /* FIXME: Change 'used' to be a array of bits (rather than of ints),
     * FIXME: create a stack array of 8 or 16 bytes.  If 'numVisuals' is less
     * FIXME: than 64 or 128 the stack array can be used instead of calling
     * FIXME: __glXMalloc / __glXFree.  If nothing else, convert 'used' to
     * FIXME: array of bytes instead of ints!
     */
    used = (int *)__glXMalloc(pScreen->numVisuals * sizeof(int));
    __glXMemset(used, 0, pScreen->numVisuals * sizeof(int));

    i = 0;
    for ( modes = MESAScreens[screen].modes 
	  ; modes != NULL
	  ; modes = modes->next ) {
	const int vis_class = _gl_convert_to_x_visual_type( modes->visualType );
	const int nplanes = (modes->rgbBits - modes->alphaBits);
	const VisualPtr pVis = pScreen->visuals;

	for (j = 0; j < pScreen->numVisuals; j++) {
	    if (pVis[j].class     == vis_class &&
		pVis[j].nplanes   == nplanes &&
		pVis[j].redMask   == modes->redMask &&
		pVis[j].greenMask == modes->greenMask &&
		pVis[j].blueMask  == modes->blueMask &&
		!used[j]) {

		/* Create the XMesa visual */
		pXMesaVisual[i] =
		    XMesaCreateVisual(pScreen,
				      pVis,
				      modes->rgbMode,
				      (modes->alphaBits > 0),
				      modes->doubleBufferMode,
				      modes->stereoMode,
				      GL_TRUE, /* ximage_flag */
				      modes->depthBits,
				      modes->stencilBits,
				      modes->accumRedBits,
				      modes->accumGreenBits,
				      modes->accumBlueBits,
				      modes->accumAlphaBits,
				      modes->samples,
				      modes->level,
				      modes->visualRating);
		/* Set the VisualID */
		modes->visualID = pVis[j].vid;

		/* Mark this visual used */
		used[j] = 1;
		break;
	    }
	}

	if ( j == pScreen->numVisuals ) {
	    ErrorF("No matching visual for __GLcontextMode with "
		   "visual class = %d (%d), nplanes = %u\n",
		   vis_class, 
		   modes->visualType,
		   (modes->rgbBits - modes->alphaBits) );
	}
	else if ( modes->visualID == -1 ) {
	    FatalError( "Matching visual found, but visualID still -1!\n" );
	}

	i++;
    }

    __glXFree(used);

    MESAScreens[screen].xm_vis = pXMesaVisual;
}

Bool __MESA_screenProbe(int screen)
{
    /*
     * Set up the current screen's visuals.
     */
    __glDDXScreenInfo.modes = MESAScreens[screen].modes;
    __glDDXScreenInfo.pVisualPriv = MESAScreens[screen].private;
    __glDDXScreenInfo.numVisuals =
	__glDDXScreenInfo.numUsableVisuals = MESAScreens[screen].num_vis;

    /*
     * Set the current screen's createContext routine.  This could be
     * wrapped by a DDX GLX context creation routine.
     */
    __glDDXScreenInfo.createContext = __MESA_createContext;

    /*
     * The ordering of the rgb compenents might have been changed by the
     * driver after mi initialized them.
     */
    fixup_visuals(screen);

    /*
     * Find the GLX visuals that are supported by this screen and create
     * XMesa's visuals.
     */
    init_screen_visuals(screen);

    return TRUE;
}

extern void __MESA_resetExtension(void)
{
    int i, j;

    XMesaReset();

    for (i = 0; i < screenInfo.numScreens; i++) {
	for (j = 0; j < MESAScreens[i].num_vis; j++) {
	  if (MESAScreens[i].xm_vis[j]) {
	        XMesaDestroyVisual(MESAScreens[i].xm_vis[j]);
		MESAScreens[i].xm_vis[j] = NULL;
	  }
	}
	_gl_context_modes_destroy( MESAScreens[i].modes );
	MESAScreens[i].modes = NULL;
	__glXFree(MESAScreens[i].private);
	MESAScreens[i].private = NULL;
	__glXFree(MESAScreens[i].xm_vis);
	MESAScreens[i].xm_vis = NULL;
	MESAScreens[i].num_vis = 0;
    }
    __glDDXScreenInfo.modes = NULL;
    MESA_CC = NULL;
}

void __MESA_createBuffer(__GLXdrawablePrivate *glxPriv)
{
    DrawablePtr pDraw = glxPriv->pDraw;
    XMesaVisual xm_vis = find_mesa_visual(pDraw->pScreen->myNum,
					  glxPriv->modes->visualID);
    __GLdrawablePrivate *glPriv = &glxPriv->glPriv;
    __MESA_buffer buf;

    if (xm_vis == NULL) {
	ErrorF("find_mesa_visual returned NULL for visualID = 0x%04x\n",
	       glxPriv->modes->visualID);
    }
    buf = (__MESA_buffer)__glXMalloc(sizeof(struct __MESA_bufferRec));

    /* Create Mesa's buffers */
    if (glxPriv->type == DRAWABLE_WINDOW) {
	buf->xm_buf = (void *)XMesaCreateWindowBuffer(xm_vis,
						      (WindowPtr)pDraw);
    } else {
	buf->xm_buf = (void *)XMesaCreatePixmapBuffer(xm_vis,
						      (PixmapPtr)pDraw, 0);
    }

    /* Wrap the front buffer's resize routine */
    buf->fbresize = glPriv->frontBuffer.resize;
    glPriv->frontBuffer.resize = __MESA_resizeBuffers;

    /* Wrap the swap buffers routine */
    buf->fbswap = glxPriv->swapBuffers;
    glxPriv->swapBuffers = __MESA_swapBuffers;

    /* Save Mesa's private buffer structure */
    glPriv->private = (void *)buf;
    glPriv->freePrivate = __MESA_destroyBuffer;
}

GLboolean __MESA_resizeBuffers(__GLdrawableBuffer *buffer,
			       GLint x, GLint y,
			       GLuint width, GLuint height, 
			       __GLdrawablePrivate *glPriv,
			       GLuint bufferMask)
{
    __MESA_buffer buf = (__MESA_buffer)glPriv->private;

    if (buf->xm_buf)
	XMesaResizeBuffers(buf->xm_buf);

    return (*buf->fbresize)(buffer, x, y, width, height, glPriv, bufferMask);
}

GLboolean __MESA_swapBuffers(__GLXdrawablePrivate *glxPriv)
{
    __MESA_buffer buf = (__MESA_buffer)glxPriv->glPriv.private;

    /*
    ** Do not call the wrapped swap buffers routine since Mesa has
    ** already done the swap.
    */
    XMesaSwapBuffers(buf->xm_buf);

    return GL_TRUE;
}

void __MESA_destroyBuffer(__GLdrawablePrivate *glPriv)
{
    __MESA_buffer buf = (__MESA_buffer)glPriv->private;
    __GLXdrawablePrivate *glxPriv = (__GLXdrawablePrivate *)glPriv->other;

#ifdef NXAGENT_SERVER
    AddWSDrawBuffer(& (buf -> xm_buf -> mesa_buffer) );
#endif

    /* Destroy Mesa's buffers */
    if (buf->xm_buf)
	XMesaDestroyBuffer(buf->xm_buf);

    /* Unwrap these routines */
    glxPriv->swapBuffers = buf->fbswap;
    glPriv->frontBuffer.resize = buf->fbresize;

    __glXFree(glPriv->private);
    glPriv->private = NULL; 
}

__GLinterface *__MESA_createContext(__GLimports *imports,
				    __GLcontextModes *modes,
				    __GLinterface *shareGC)
{
    __GLcontext *gl_ctx = NULL;
    __GLcontext *m_share = NULL;
    __GLXcontext *glxc = (__GLXcontext *)imports->other;
    XMesaVisual xm_vis;

    if (shareGC) 
       m_share = (__GLcontext *)shareGC;

    xm_vis = find_mesa_visual(glxc->pScreen->myNum, glxc->modes->visualID);
    if (xm_vis) {
       XMesaContext xmshare = m_share ? m_share->DriverCtx : 0;
       XMesaContext xmctx = XMesaCreateContext(xm_vis, xmshare);
       gl_ctx = xmctx ? &xmctx->mesa : 0;
    }
    else {
	ErrorF("find_mesa_visual returned NULL for visualID = 0x%04x\n",
	       glxc->modes->visualID);
    }


    if (!gl_ctx)
       return NULL;
	
    gl_ctx->imports = *imports;
    gl_ctx->exports.destroyContext = __MESA_destroyContext;
    gl_ctx->exports.loseCurrent = __MESA_loseCurrent;
    gl_ctx->exports.makeCurrent = __MESA_makeCurrent;
    gl_ctx->exports.shareContext = __MESA_shareContext;
    gl_ctx->exports.copyContext = __MESA_copyContext;
    gl_ctx->exports.forceCurrent = __MESA_forceCurrent;
    gl_ctx->exports.notifyResize = __MESA_notifyResize;
    gl_ctx->exports.notifyDestroy = __MESA_notifyDestroy;
    gl_ctx->exports.notifySwapBuffers = __MESA_notifySwapBuffers;
    gl_ctx->exports.dispatchExec = __MESA_dispatchExec;
    gl_ctx->exports.beginDispatchOverride = __MESA_beginDispatchOverride;
    gl_ctx->exports.endDispatchOverride = __MESA_endDispatchOverride;

    return (__GLinterface *)gl_ctx;
}

GLboolean __MESA_destroyContext(__GLcontext *gc)
{
    XMesaContext xmesa = (XMesaContext) gc->DriverCtx;
    XMesaDestroyContext( xmesa );
    return GL_TRUE;
}

GLboolean __MESA_loseCurrent(__GLcontext *gc)
{
    XMesaContext xmesa = (XMesaContext) gc->DriverCtx;
    MESA_CC = NULL;
    __glXLastContext = NULL;
    return XMesaLoseCurrent(xmesa);
}

GLboolean __MESA_makeCurrent(__GLcontext *gc)
{
    __GLdrawablePrivate *drawPriv = gc->imports.getDrawablePrivate( gc );
    __MESA_buffer drawBuf = (__MESA_buffer)drawPriv->private;
    __GLdrawablePrivate *readPriv = gc->imports.getReadablePrivate( gc );
    __MESA_buffer readBuf = (__MESA_buffer)readPriv->private;
    XMesaContext xmesa = (XMesaContext) gc->DriverCtx;

    MESA_CC = gc;
    return XMesaMakeCurrent2(xmesa, drawBuf->xm_buf, readBuf->xm_buf);
}

GLboolean __MESA_shareContext(__GLcontext *gc, __GLcontext *gcShare)
{
    /* NOT_DONE */
    /* XXX I don't see where/how this could ever be called */
    ErrorF("__MESA_shareContext\n");
    return GL_FALSE;
}

GLboolean __MESA_copyContext(__GLcontext *dst, const __GLcontext *src,
			     GLuint mask)
{
    XMesaContext xm_dst = (XMesaContext) dst->DriverCtx;
    const XMesaContext xm_src = (const XMesaContext) src->DriverCtx;
    _mesa_copy_context(&xm_src->mesa, &xm_dst->mesa, mask);
    return GL_TRUE;
}

GLboolean __MESA_forceCurrent(__GLcontext *gc)
{
    XMesaContext xmesa = (XMesaContext) gc->DriverCtx;
    MESA_CC = gc;
    return XMesaForceCurrent(xmesa);
}

GLboolean __MESA_notifyResize(__GLcontext *gc)
{
    /* NOT_DONE */
    ErrorF("__MESA_notifyResize\n");
    return GL_FALSE;
}

void __MESA_notifyDestroy(__GLcontext *gc)
{
    /* NOT_DONE */
    ErrorF("__MESA_notifyDestroy\n");
    return;
}

void __MESA_notifySwapBuffers(__GLcontext *gc)
{
    _mesa_notifySwapBuffers(gc);
}

struct __GLdispatchStateRec *__MESA_dispatchExec(__GLcontext *gc)
{
    /* NOT_DONE */
    ErrorF("__MESA_dispatchExec\n");
    return NULL;
}

void __MESA_beginDispatchOverride(__GLcontext *gc)
{
    /* NOT_DONE */
    ErrorF("__MESA_beginDispatchOverride\n");
    return;
}

void __MESA_endDispatchOverride(__GLcontext *gc)
{
    /* NOT_DONE */
    ErrorF("__MESA_endDispatchOverride\n");
    return;
}


/*
 * Server-side GLX uses these functions which are normally defined
 * in the OpenGL SI.
 */

GLuint __glFloorLog2(GLuint val)
{
    int c = 0;

    while (val > 1) {
	c++;
	val >>= 1;
    }
    return c;
}