summaryrefslogtreecommitdiff
path: root/src/gallium/winsys/xlib/xm_api.c
blob: 26b722f3439208c3c34351d4ef8fd1a5ecc843e3 (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
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
/*
 * Mesa 3-D graphics library
 * Version:  7.1
 *
 * Copyright (C) 1999-2007  Brian Paul   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, sublicense,
 * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL 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.
 */

/**
 * \file xm_api.c
 *
 * All the XMesa* API functions.
 *
 *
 * NOTES:
 *
 * The window coordinate system origin (0,0) is in the lower-left corner
 * of the window.  X11's window coordinate origin is in the upper-left
 * corner of the window.  Therefore, most drawing functions in this
 * file have to flip Y coordinates.
 *
 * Define USE_XSHM in the Makefile with -DUSE_XSHM if you want to compile
 * in support for the MIT Shared Memory extension.  If enabled, when you
 * use an Ximage for the back buffer in double buffered mode, the "swap"
 * operation will be faster.  You must also link with -lXext.
 *
 * Byte swapping:  If the Mesa host and the X display use a different
 * byte order then there's some trickiness to be aware of when using
 * XImages.  The byte ordering used for the XImage is that of the X
 * display, not the Mesa host.
 * The color-to-pixel encoding for True/DirectColor must be done
 * according to the display's visual red_mask, green_mask, and blue_mask.
 * If XPutPixel is used to put a pixel into an XImage then XPutPixel will
 * do byte swapping if needed.  If one wants to directly "poke" the pixel
 * into the XImage's buffer then the pixel must be byte swapped first.
 *
 */

#ifdef __CYGWIN__
#undef WIN32
#undef __WIN32__
#endif

#include "glxheader.h"
#include "GL/xmesa.h"
#include "xmesaP.h"
#include "main/context.h"
#include "main/framebuffer.h"
#include "glapi/glthread.h"

#include "state_tracker/st_public.h"
#include "state_tracker/st_context.h"
#include "pipe/p_defines.h"
#include "pipe/p_context.h"

#include "xm_winsys_aub.h"

/**
 * Global X driver lock
 */
_glthread_Mutex _xmesa_lock;


int xmesa_mode;


/**********************************************************************/
/*****                     X Utility Functions                    *****/
/**********************************************************************/


/**
 * Return the host's byte order as LSBFirst or MSBFirst ala X.
 */
#ifndef XFree86Server
static int host_byte_order( void )
{
   int i = 1;
   char *cptr = (char *) &i;
   return (*cptr==1) ? LSBFirst : MSBFirst;
}
#endif


/**
 * Check if the X Shared Memory extension is available.
 * Return:  0 = not available
 *          1 = shared XImage support available
 *          2 = shared Pixmap support available also
 */
int xmesa_check_for_xshm( XMesaDisplay *display )
{
#if defined(USE_XSHM) && !defined(XFree86Server)
   int major, minor, ignore;
   Bool pixmaps;

   if (getenv("SP_NO_RAST")) 
      return 0;

   if (getenv("MESA_NOSHM")) {
      return 0;
   }

   if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
      if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
	 return (pixmaps==True) ? 2 : 1;
      }
      else {
	 return 0;
      }
   }
   else {
      return 0;
   }
#else
   /* No  XSHM support */
   return 0;
#endif
}


/**
 * Return the true number of bits per pixel for XImages.
 * For example, if we request a 24-bit deep visual we may actually need/get
 * 32bpp XImages.  This function returns the appropriate bpp.
 * Input:  dpy - the X display
 *         visinfo - desribes the visual to be used for XImages
 * Return:  true number of bits per pixel for XImages
 */
static int
bits_per_pixel( XMesaVisual xmv )
{
#ifdef XFree86Server
   const int depth = xmv->nplanes;
   int i;
   assert(depth > 0);
   for (i = 0; i < screenInfo.numPixmapFormats; i++) {
      if (screenInfo.formats[i].depth == depth)
         return screenInfo.formats[i].bitsPerPixel;
   }
   return depth;  /* should never get here, but this should be safe */
#else
   XMesaDisplay *dpy = xmv->display;
   XMesaVisualInfo visinfo = xmv->visinfo;
   XMesaImage *img;
   int bitsPerPixel;
   /* Create a temporary XImage */
   img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
		       ZPixmap, 0,           /*format, offset*/
		       (char*) MALLOC(8),    /*data*/
		       1, 1,                 /*width, height*/
		       32,                   /*bitmap_pad*/
		       0                     /*bytes_per_line*/
                     );
   assert(img);
   /* grab the bits/pixel value */
   bitsPerPixel = img->bits_per_pixel;
   /* free the XImage */
   _mesa_free( img->data );
   img->data = NULL;
   XMesaDestroyImage( img );
   return bitsPerPixel;
#endif
}



/*
 * Determine if a given X window ID is valid (window exists).
 * Do this by calling XGetWindowAttributes() for the window and
 * checking if we catch an X error.
 * Input:  dpy - the display
 *         win - the window to check for existance
 * Return:  GL_TRUE - window exists
 *          GL_FALSE - window doesn't exist
 */
#ifndef XFree86Server
static GLboolean WindowExistsFlag;

static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
{
   (void) dpy;
   if (xerr->error_code == BadWindow) {
      WindowExistsFlag = GL_FALSE;
   }
   return 0;
}

static GLboolean window_exists( XMesaDisplay *dpy, Window win )
{
   XWindowAttributes wa;
   int (*old_handler)( XMesaDisplay*, XErrorEvent* );
   WindowExistsFlag = GL_TRUE;
   old_handler = XSetErrorHandler(window_exists_err_handler);
   XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
   XSetErrorHandler(old_handler);
   return WindowExistsFlag;
}

static Status
get_drawable_size( XMesaDisplay *dpy, Drawable d, uint *width, uint *height )
{
   Window root;
   Status stat;
   int xpos, ypos;
   unsigned int w, h, bw, depth;
   stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
   *width = w;
   *height = h;
   return stat;
}
#endif


/**
 * Return the size of the window (or pixmap) that corresponds to the
 * given XMesaBuffer.
 * \param width  returns width in pixels
 * \param height  returns height in pixels
 */
static void
xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
                      GLuint *width, GLuint *height)
{
#ifdef XFree86Server
   *width = MIN2(b->drawable->width, MAX_WIDTH);
   *height = MIN2(b->drawable->height, MAX_HEIGHT);
#else
   Status stat;

   _glthread_LOCK_MUTEX(_xmesa_lock);
   XSync(b->xm_visual->display, 0); /* added for Chromium */
   stat = get_drawable_size(dpy, b->drawable, width, height);
   _glthread_UNLOCK_MUTEX(_xmesa_lock);

   if (!stat) {
      /* probably querying a window that's recently been destroyed */
      _mesa_warning(NULL, "XGetGeometry failed!\n");
      *width = *height = 1;
   }
#endif
}


/**
 * Choose the pixel format for the given visual.
 * This will tell the gallium driver how to pack pixel data into
 * drawing surfaces.
 */
static GLuint
choose_pixel_format(XMesaVisual v)
{
   if (   GET_REDMASK(v)   == 0x0000ff
       && GET_GREENMASK(v) == 0x00ff00
       && GET_BLUEMASK(v)  == 0xff0000
       && v->BitsPerPixel == 32) {
      if (CHECK_BYTE_ORDER(v)) {
         /* no byteswapping needed */
         return 0 /* PIXEL_FORMAT_U_A8_B8_G8_R8 */;
      }
      else {
         return PIPE_FORMAT_R8G8B8A8_UNORM;
      }
   }
   else if (   GET_REDMASK(v)   == 0xff0000
            && GET_GREENMASK(v) == 0x00ff00
            && GET_BLUEMASK(v)  == 0x0000ff
            && v->BitsPerPixel == 32) {
      if (CHECK_BYTE_ORDER(v)) {
         /* no byteswapping needed */
         return PIPE_FORMAT_A8R8G8B8_UNORM;
      }
      else {
         return PIPE_FORMAT_B8G8R8A8_UNORM;
      }
   }
   else if (   GET_REDMASK(v)   == 0xf800
            && GET_GREENMASK(v) == 0x07e0
            && GET_BLUEMASK(v)  == 0x001f
            && CHECK_BYTE_ORDER(v)
            && v->BitsPerPixel == 16) {
      /* 5-6-5 RGB */
      return PIPE_FORMAT_R5G6B5_UNORM;
   }

   assert(0);
   return 0;
}



/**********************************************************************/
/*****                Linked list of XMesaBuffers                 *****/
/**********************************************************************/

XMesaBuffer XMesaBufferList = NULL;


/**
 * Allocate a new XMesaBuffer object which corresponds to the given drawable.
 * Note that XMesaBuffer is derived from GLframebuffer.
 * The new XMesaBuffer will not have any size (Width=Height=0).
 *
 * \param d  the corresponding X drawable (window or pixmap)
 * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
 * \param vis  the buffer's visual
 * \param cmap  the window's colormap, if known.
 * \return new XMesaBuffer or NULL if any problem
 */
static XMesaBuffer
create_xmesa_buffer(XMesaDrawable d, BufferType type,
                    XMesaVisual vis, XMesaColormap cmap)
{
   XMesaBuffer b;
   GLframebuffer *fb;
   enum pipe_format colorFormat, depthFormat, stencilFormat;
   uint width, height;

   ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);

   b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
   if (!b)
      return NULL;

   b->drawable = d;

   b->xm_visual = vis;
   b->type = type;
   b->cmap = cmap;

   /* determine PIPE_FORMATs for buffers */
   colorFormat = choose_pixel_format(vis);

   if (vis->mesa_visual.depthBits == 0)
      depthFormat = PIPE_FORMAT_NONE;
   else if (vis->mesa_visual.depthBits <= 16)
      depthFormat = PIPE_FORMAT_Z16_UNORM;
   else if (vis->mesa_visual.depthBits <= 24)
      depthFormat = PIPE_FORMAT_S8Z24_UNORM;
   else
      depthFormat = PIPE_FORMAT_Z32_UNORM;

   if (vis->mesa_visual.stencilBits == 8) {
      if (depthFormat == PIPE_FORMAT_S8Z24_UNORM)
         stencilFormat = depthFormat;
      else
         stencilFormat = PIPE_FORMAT_S8_UNORM;
   }
   else {
      stencilFormat = PIPE_FORMAT_NONE;
   }


   get_drawable_size(vis->display, d, &width, &height);

   /*
    * Create framebuffer, but we'll plug in our own renderbuffers below.
    */
   b->stfb = st_create_framebuffer(&vis->mesa_visual,
                                   colorFormat, depthFormat, stencilFormat,
                                   width, height,
                                   (void *) b);
   fb = &b->stfb->Base;

   /*
    * Create scratch XImage for xmesa_display_surface()
    */
   b->tempImage = XCreateImage(vis->display,
                               vis->visinfo->visual,
                               vis->visinfo->depth,
                               ZPixmap, 0,   /* format, offset */
                               NULL,         /* data */
                               0, 0,         /* size */
                               32,           /* bitmap_pad */
                               0);           /* bytes_per_line */

   /* GLX_EXT_texture_from_pixmap */
   b->TextureTarget = 0;
   b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
   b->TextureMipmap = 0;

   /* insert buffer into linked list */
   b->Next = XMesaBufferList;
   XMesaBufferList = b;

   return b;
}


/**
 * Find an XMesaBuffer by matching X display and colormap but NOT matching
 * the notThis buffer.
 */
XMesaBuffer
xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
{
   XMesaBuffer b;
   for (b = XMesaBufferList; b; b = b->Next) {
      if (b->xm_visual->display == dpy &&
          b->cmap == cmap &&
          b != notThis) {
         return b;
      }
   }
   return NULL;
}


/**
 * Remove buffer from linked list, delete if no longer referenced.
 */
static void
xmesa_free_buffer(XMesaBuffer buffer)
{
   XMesaBuffer prev = NULL, b;

   for (b = XMesaBufferList; b; b = b->Next) {
      if (b == buffer) {
         struct gl_framebuffer *fb = &buffer->stfb->Base;

         /* unlink buffer from list */
         if (prev)
            prev->Next = buffer->Next;
         else
            XMesaBufferList = buffer->Next;

         /* mark as delete pending */
         fb->DeletePending = GL_TRUE;

         /* Since the X window for the XMesaBuffer is going away, we don't
          * want to dereference this pointer in the future.
          */
         b->drawable = 0;

         buffer->tempImage->data = NULL;
         XDestroyImage(buffer->tempImage);

         /* Unreference.  If count = zero we'll really delete the buffer */
         _mesa_unreference_framebuffer(&fb);

         XFreeGC(b->xm_visual->display, b->gc);

         free(buffer);

         return;
      }
      /* continue search */
      prev = b;
   }
   /* buffer not found in XMesaBufferList */
   _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
}



/**********************************************************************/
/*****                   Misc Private Functions                   *****/
/**********************************************************************/


/**
 * When a context is bound for the first time, we can finally finish
 * initializing the context's visual and buffer information.
 * \param v  the XMesaVisual to initialize
 * \param b  the XMesaBuffer to initialize (may be NULL)
 * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
 * \param window  the window/pixmap we're rendering into
 * \param cmap  the colormap associated with the window/pixmap
 * \return GL_TRUE=success, GL_FALSE=failure
 */
static GLboolean
initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
                             GLboolean rgb_flag, XMesaDrawable window,
                             XMesaColormap cmap)
{
#ifdef XFree86Server
   int client = (window) ? CLIENT_ID(window->id) : 0;
#endif

   ASSERT(!b || b->xm_visual == v);

   /* Save true bits/pixel */
   v->BitsPerPixel = bits_per_pixel(v);
   assert(v->BitsPerPixel > 0);

   if (rgb_flag == GL_FALSE) {
      /* COLOR-INDEXED WINDOW: not supported*/
      return GL_FALSE;
   }
   else {
      /* RGB WINDOW:
       * We support RGB rendering into almost any kind of visual.
       */
      const int xclass = v->mesa_visual.visualType;
      if (xclass != GLX_TRUE_COLOR && xclass == !GLX_DIRECT_COLOR) {
	 _mesa_warning(NULL,
            "XMesa: RGB mode rendering not supported in given visual.\n");
	 return GL_FALSE;
      }
      v->mesa_visual.indexBits = 0;

      if (v->BitsPerPixel == 32) {
         /* We use XImages for all front/back buffers.  If an X Window or
          * X Pixmap is 32bpp, there's no guarantee that the alpha channel
          * will be preserved.  For XImages we're in luck.
          */
         v->mesa_visual.alphaBits = 8;
      }
   }

   /*
    * If MESA_INFO env var is set print out some debugging info
    * which can help Brian figure out what's going on when a user
    * reports bugs.
    */
   if (_mesa_getenv("MESA_INFO")) {
      _mesa_printf("X/Mesa visual = %p\n", (void *) v);
      _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
      _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
      _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
   }

   if (b && window) {
      /* these should have been set in create_xmesa_buffer */
      ASSERT(b->drawable == window);

      /* Setup for single/double buffering */
      if (v->mesa_visual.doubleBufferMode) {
         /* Double buffered */
         b->shm = xmesa_check_for_xshm( v->display );
      }

      /* X11 graphics context */
#ifdef XFree86Server
      b->gc = CreateScratchGC(v->display, window->depth);
#else
      b->gc = XCreateGC( v->display, window, 0, NULL );
#endif
      XMesaSetFunction( v->display, b->gc, GXcopy );
   }

   return GL_TRUE;
}



#define NUM_VISUAL_TYPES   6

/**
 * Convert an X visual type to a GLX visual type.
 * 
 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
 *        to be converted.
 * \return If \c visualType is a valid X visual type, a GLX visual type will
 *         be returned.  Otherwise \c GLX_NONE will be returned.
 * 
 * \note
 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
 * DRI CVS tree.
 */
static GLint
xmesa_convert_from_x_visual_type( int visualType )
{
    static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
	GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
	GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
	GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
    };

    return ( (unsigned) visualType < NUM_VISUAL_TYPES )
	? glx_visual_types[ visualType ] : GLX_NONE;
}


/**********************************************************************/
/*****                       Public Functions                     *****/
/**********************************************************************/


/*
 * Create a new X/Mesa visual.
 * Input:  display - X11 display
 *         visinfo - an XVisualInfo pointer
 *         rgb_flag - GL_TRUE = RGB mode,
 *                    GL_FALSE = color index mode
 *         alpha_flag - alpha buffer requested?
 *         db_flag - GL_TRUE = double-buffered,
 *                   GL_FALSE = single buffered
 *         stereo_flag - stereo visual?
 *         ximage_flag - GL_TRUE = use an XImage for back buffer,
 *                       GL_FALSE = use an off-screen pixmap for back buffer
 *         depth_size - requested bits/depth values, or zero
 *         stencil_size - requested bits/stencil values, or zero
 *         accum_red_size - requested bits/red accum values, or zero
 *         accum_green_size - requested bits/green accum values, or zero
 *         accum_blue_size - requested bits/blue accum values, or zero
 *         accum_alpha_size - requested bits/alpha accum values, or zero
 *         num_samples - number of samples/pixel if multisampling, or zero
 *         level - visual level, usually 0
 *         visualCaveat - ala the GLX extension, usually GLX_NONE
 * Return;  a new XMesaVisual or 0 if error.
 */
PUBLIC
XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
                               XMesaVisualInfo visinfo,
                               GLboolean rgb_flag,
                               GLboolean alpha_flag,
                               GLboolean db_flag,
                               GLboolean stereo_flag,
                               GLboolean ximage_flag,
                               GLint depth_size,
                               GLint stencil_size,
                               GLint accum_red_size,
                               GLint accum_green_size,
                               GLint accum_blue_size,
                               GLint accum_alpha_size,
                               GLint num_samples,
                               GLint level,
                               GLint visualCaveat )
{
   XMesaVisual v;
   GLint red_bits, green_bits, blue_bits, alpha_bits;

#ifndef XFree86Server
   /* For debugging only */
   if (_mesa_getenv("MESA_XSYNC")) {
      /* This makes debugging X easier.
       * In your debugger, set a breakpoint on _XError to stop when an
       * X protocol error is generated.
       */
      XSynchronize( display, 1 );
   }
#endif

   v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
   if (!v) {
      return NULL;
   }

   v->display = display;

   /* Save a copy of the XVisualInfo struct because the user may X_mesa_free()
    * the struct but we may need some of the information contained in it
    * at a later time.
    */
#ifndef XFree86Server
   v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
   if(!v->visinfo) {
      _mesa_free(v);
      return NULL;
   }
   MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
#endif

   v->ximage_flag = ximage_flag;

#ifdef XFree86Server
   /* We could calculate these values by ourselves.  nplanes is either the sum
    * of the red, green, and blue bits or the number index bits.
    * ColormapEntries is either (1U << index_bits) or
    * (1U << max(redBits, greenBits, blueBits)).
    */
   assert(visinfo->nplanes > 0);
   v->nplanes = visinfo->nplanes;
   v->ColormapEntries = visinfo->ColormapEntries;

   v->mesa_visual.redMask = visinfo->redMask;
   v->mesa_visual.greenMask = visinfo->greenMask;
   v->mesa_visual.blueMask = visinfo->blueMask;
   v->mesa_visual.visualID = visinfo->vid;
   v->mesa_visual.screen = 0; /* FIXME: What should be done here? */
#else
   v->mesa_visual.redMask = visinfo->red_mask;
   v->mesa_visual.greenMask = visinfo->green_mask;
   v->mesa_visual.blueMask = visinfo->blue_mask;
   v->mesa_visual.visualID = visinfo->visualid;
   v->mesa_visual.screen = visinfo->screen;
#endif

#if defined(XFree86Server) || !(defined(__cplusplus) || defined(c_plusplus))
   v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
#else
   v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
#endif

   v->mesa_visual.visualRating = visualCaveat;

   if (alpha_flag)
      v->mesa_visual.alphaBits = 8;

   (void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );

   {
      const int xclass = v->mesa_visual.visualType;
      if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
         red_bits   = _mesa_bitcount(GET_REDMASK(v));
         green_bits = _mesa_bitcount(GET_GREENMASK(v));
         blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
      }
      else {
         /* this is an approximation */
         int depth;
         depth = GET_VISUAL_DEPTH(v);
         red_bits = depth / 3;
         depth -= red_bits;
         green_bits = depth / 2;
         depth -= green_bits;
         blue_bits = depth;
         alpha_bits = 0;
         assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
      }
      alpha_bits = v->mesa_visual.alphaBits;
   }

   _mesa_initialize_visual( &v->mesa_visual,
                            rgb_flag, db_flag, stereo_flag,
                            red_bits, green_bits,
                            blue_bits, alpha_bits,
                            v->mesa_visual.indexBits,
                            depth_size,
                            stencil_size,
                            accum_red_size, accum_green_size,
                            accum_blue_size, accum_alpha_size,
                            0 );

   /* XXX minor hack */
   v->mesa_visual.level = level;
   return v;
}


PUBLIC
void XMesaDestroyVisual( XMesaVisual v )
{
#ifndef XFree86Server
   _mesa_free(v->visinfo);
#endif
   _mesa_free(v);
}



/**
 * Create a new XMesaContext.
 * \param v  the XMesaVisual
 * \param share_list  another XMesaContext with which to share display
 *                    lists or NULL if no sharing is wanted.
 * \return an XMesaContext or NULL if error.
 */
PUBLIC
XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
{
   static GLboolean firstTime = GL_TRUE;
   struct pipe_context *pipe;
   XMesaContext c;
   GLcontext *mesaCtx;
   uint pf;

   if (firstTime) {
      _glthread_INIT_MUTEX(_xmesa_lock);
      firstTime = GL_FALSE;
   }

   /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
   c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
   if (!c)
      return NULL;

   pf = choose_pixel_format(v);
   assert(pf);

   c->xm_visual = v;
   c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */

   if (!getenv("XM_AUB")) {
      xmesa_mode = XMESA_SOFTPIPE;
      pipe = xmesa_create_pipe_context( c, pf );
   }
   else {
      xmesa_mode = XMESA_AUB;
      pipe = xmesa_create_i965simple(xmesa_get_pipe_winsys_aub(v));
   }

   c->st = st_create_context(pipe, &v->mesa_visual,
                             share_list ? share_list->st : NULL);
   mesaCtx = c->st->ctx;
   c->st->ctx->DriverCtx = c;

#if 00
   _mesa_enable_sw_extensions(mesaCtx);
   _mesa_enable_1_3_extensions(mesaCtx);
   _mesa_enable_1_4_extensions(mesaCtx);
   _mesa_enable_1_5_extensions(mesaCtx);
   _mesa_enable_2_0_extensions(mesaCtx);
#endif

#ifdef XFree86Server
   /* If we're running in the X server, do bounds checking to prevent
    * segfaults and server crashes!
    */
   mesaCtx->Const.CheckArrayBounds = GL_TRUE;
#endif

   return c;
}



PUBLIC
void XMesaDestroyContext( XMesaContext c )
{
   st_destroy_context(c->st);
   _mesa_free(c);
}



/**
 * Private function for creating an XMesaBuffer which corresponds to an
 * X window or pixmap.
 * \param v  the window's XMesaVisual
 * \param w  the window we're wrapping
 * \return  new XMesaBuffer or NULL if error
 */
PUBLIC XMesaBuffer
XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
{
#ifndef XFree86Server
   XWindowAttributes attr;
#endif
   XMesaBuffer b;
   XMesaColormap cmap;
   int depth;

   assert(v);
   assert(w);

   /* Check that window depth matches visual depth */
#ifdef XFree86Server
   depth = ((XMesaDrawable)w)->depth;
#else
   XGetWindowAttributes( v->display, w, &attr );
   depth = attr.depth;
#endif
   if (GET_VISUAL_DEPTH(v) != depth) {
      _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
                    GET_VISUAL_DEPTH(v), depth);
      return NULL;
   }

   /* Find colormap */
#ifdef XFree86Server
   cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
#else
   if (attr.colormap) {
      cmap = attr.colormap;
   }
   else {
      _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
      /* this is weird, a window w/out a colormap!? */
      /* OK, let's just allocate a new one and hope for the best */
      cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
   }
#endif

   b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
   if (!b)
      return NULL;

   if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
                                      (XMesaDrawable) w, cmap )) {
      xmesa_free_buffer(b);
      return NULL;
   }

   return b;
}



/**
 * Create a new XMesaBuffer from an X pixmap.
 *
 * \param v    the XMesaVisual
 * \param p    the pixmap
 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
 *             \c GLX_DIRECT_COLOR visual for the pixmap
 * \returns new XMesaBuffer or NULL if error
 */
PUBLIC XMesaBuffer
XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
{
   XMesaBuffer b;

   assert(v);

   b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
   if (!b)
      return NULL;

   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
				     (XMesaDrawable) p, cmap)) {
      xmesa_free_buffer(b);
      return NULL;
   }

   return b;
}


/**
 * For GLX_EXT_texture_from_pixmap
 */
XMesaBuffer
XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
                               XMesaColormap cmap,
                               int format, int target, int mipmap)
{
   GET_CURRENT_CONTEXT(ctx);
   XMesaBuffer b;
   GLuint width, height;

   assert(v);

   b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
   if (!b)
      return NULL;

   /* get pixmap size, update framebuffer/renderbuffer dims */
   xmesa_get_window_size(v->display, b, &width, &height);
   _mesa_resize_framebuffer(NULL, &(b->stfb->Base), width, height);

   if (target == 0) {
      /* examine dims */
      if (ctx->Extensions.ARB_texture_non_power_of_two) {
         target = GLX_TEXTURE_2D_EXT;
      }
      else if (   _mesa_bitcount(width)  == 1
               && _mesa_bitcount(height) == 1) {
         /* power of two size */
         if (height == 1) {
            target = GLX_TEXTURE_1D_EXT;
         }
         else {
            target = GLX_TEXTURE_2D_EXT;
         }
      }
      else if (ctx->Extensions.NV_texture_rectangle) {
         target = GLX_TEXTURE_RECTANGLE_EXT;
      }
      else {
         /* non power of two textures not supported */
         XMesaDestroyBuffer(b);
         return 0;
      }
   }

   b->TextureTarget = target;
   b->TextureFormat = format;
   b->TextureMipmap = mipmap;

   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
				     (XMesaDrawable) p, cmap)) {
      xmesa_free_buffer(b);
      return NULL;
   }

   return b;
}



XMesaBuffer
XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
                   unsigned int width, unsigned int height)
{
#ifndef XFree86Server
   XMesaWindow root;
   XMesaDrawable drawable;  /* X Pixmap Drawable */
   XMesaBuffer b;

   /* allocate pixmap for front buffer */
   root = RootWindow( v->display, v->visinfo->screen );
   drawable = XCreatePixmap(v->display, root, width, height,
                            v->visinfo->depth);
   if (!drawable)
      return NULL;

   b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
   if (!b)
      return NULL;

   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
				     drawable, cmap)) {
      xmesa_free_buffer(b);
      return NULL;
   }

   return b;
#else
   return 0;
#endif
}



/*
 * Deallocate an XMesaBuffer structure and all related info.
 */
PUBLIC void
XMesaDestroyBuffer(XMesaBuffer b)
{
   xmesa_free_buffer(b);
}


/**
 * Query the current window size and update the corresponding GLframebuffer
 * and all attached renderbuffers.
 * Called when:
 *  1. the first time a buffer is bound to a context.
 *  2. from the XMesaResizeBuffers() API function.
 *  3. SwapBuffers.  XXX probabaly from xm_flush_frontbuffer() too...
 * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
 * when resizing a buffer when no rendering context is bound.
 */
void
xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
{
   GLuint width, height;
   xmesa_get_window_size(drawBuffer->xm_visual->display, drawBuffer, &width, &height);
   st_resize_framebuffer(drawBuffer->stfb, width, height);
}


/*
 * Bind buffer b to context c and make c the current rendering context.
 */
GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
{
   return XMesaMakeCurrent2( c, b, b );
}


/*
 * Bind buffer b to context c and make c the current rendering context.
 */
PUBLIC
GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
                             XMesaBuffer readBuffer )
{
   if (c) {
      if (!drawBuffer || !readBuffer)
         return GL_FALSE;  /* must specify buffers! */

#if 0
      /* XXX restore this optimization */
      if (&(c->mesa) == _mesa_get_current_context()
          && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
          && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
          && xmesa_buffer(c->mesa.DrawBuffer)->wasCurrent) {
         /* same context and buffer, do nothing */
         return GL_TRUE;
      }
#endif

      c->xm_buffer = drawBuffer;

      /* Call this periodically to detect when the user has begun using
       * GL rendering from multiple threads.
       */
      _glapi_check_multithread();

      st_make_current(c->st, drawBuffer->stfb, readBuffer->stfb);

      xmesa_check_and_update_buffer_size(c, drawBuffer);
      if (readBuffer != drawBuffer)
         xmesa_check_and_update_buffer_size(c, readBuffer);

      /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
      drawBuffer->wasCurrent = GL_TRUE;
   }
   else {
      /* Detach */
      st_make_current( NULL, NULL, NULL );
   }
   return GL_TRUE;
}


/*
 * Unbind the context c from its buffer.
 */
GLboolean XMesaUnbindContext( XMesaContext c )
{
   /* A no-op for XFree86 integration purposes */
   return GL_TRUE;
}


XMesaContext XMesaGetCurrentContext( void )
{
   GET_CURRENT_CONTEXT(ctx);
   if (ctx) {
      XMesaContext xmesa = xmesa_context(ctx);
      return xmesa;
   }
   else {
      return 0;
   }
}


XMesaBuffer XMesaGetCurrentBuffer( void )
{
   GET_CURRENT_CONTEXT(ctx);
   if (ctx) {
      XMesaBuffer xmbuf = xmesa_buffer(ctx->DrawBuffer);
      return xmbuf;
   }
   else {
      return 0;
   }
}


/* New in Mesa 3.1 */
XMesaBuffer XMesaGetCurrentReadBuffer( void )
{
   GET_CURRENT_CONTEXT(ctx);
   if (ctx) {
      return xmesa_buffer(ctx->ReadBuffer);
   }
   else {
      return 0;
   }
}


#ifdef XFree86Server
PUBLIC
GLboolean XMesaForceCurrent(XMesaContext c)
{
   if (c) {
      _glapi_set_dispatch(c->mesa.CurrentDispatch);

      if (&(c->mesa) != _mesa_get_current_context()) {
	 _mesa_make_current(&c->mesa, c->mesa.DrawBuffer, c->mesa.ReadBuffer);
      }
   }
   else {
      _mesa_make_current(NULL, NULL, NULL);
   }
   return GL_TRUE;
}


PUBLIC
GLboolean XMesaLoseCurrent(XMesaContext c)
{
   (void) c;
   _mesa_make_current(NULL, NULL, NULL);
   return GL_TRUE;
}


PUBLIC
GLboolean XMesaCopyContext( XMesaContext xm_src, XMesaContext xm_dst, GLuint mask )
{
   _mesa_copy_context(&xm_src->mesa, &xm_dst->mesa, mask);
   return GL_TRUE;
}
#endif /* XFree86Server */


#ifndef FX
GLboolean XMesaSetFXmode( GLint mode )
{
   (void) mode;
   return GL_FALSE;
}
#endif



/*
 * Copy the back buffer to the front buffer.  If there's no back buffer
 * this is a no-op.
 */
PUBLIC
void XMesaSwapBuffers( XMesaBuffer b )
{
   struct pipe_surface *surf;

   /* If we're swapping the buffer associated with the current context
    * we have to flush any pending rendering commands first.
    */
   st_notify_swapbuffers(b->stfb);

   surf = st_get_framebuffer_surface(b->stfb, ST_SURFACE_BACK_LEFT);
   if (surf) {
      if (xmesa_mode == XMESA_AUB)
         xmesa_display_aub( surf );
      else
	 xmesa_display_surface(b, surf);
   }

   xmesa_check_and_update_buffer_size(NULL, b);
}



/*
 * Copy sub-region of back buffer to front buffer
 */
void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
{
   struct pipe_surface *surf_front
      = st_get_framebuffer_surface(b->stfb, ST_SURFACE_FRONT_LEFT);
   struct pipe_surface *surf_back
      = st_get_framebuffer_surface(b->stfb, ST_SURFACE_BACK_LEFT);
   struct pipe_context *pipe = NULL; /* XXX fix */

   if (!surf_front || !surf_back)
      return;

   pipe->surface_copy(pipe,
                      FALSE,
                      surf_front, x, y,  /* dest */
                      surf_back, x, y,   /* src */
                      width, height);
}



/*
 * Return the depth buffer associated with an XMesaBuffer.
 * Input:  b - the XMesa buffer handle
 * Output:  width, height - size of buffer in pixels
 *          bytesPerValue - bytes per depth value (2 or 4)
 *          buffer - pointer to depth buffer values
 * Return:  GL_TRUE or GL_FALSE to indicate success or failure.
 */
GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
                               GLint *bytesPerValue, void **buffer )
{
   *width = 0;
   *height = 0;
   *bytesPerValue = 0;
   *buffer = 0;
   return GL_FALSE;
}


void XMesaFlush( XMesaContext c )
{
   if (c && c->xm_visual->display) {
#ifdef XFree86Server
      /* NOT_NEEDED */
#else
      XSync( c->xm_visual->display, False );
#endif
   }
}



const char *XMesaGetString( XMesaContext c, int name )
{
   (void) c;
   if (name==XMESA_VERSION) {
      return "5.0";
   }
   else if (name==XMESA_EXTENSIONS) {
      return "";
   }
   else {
      return NULL;
   }
}



XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
{
   XMesaBuffer b;
   for (b=XMesaBufferList; b; b=b->Next) {
      if (b->drawable == d && b->xm_visual->display == dpy) {
         return b;
      }
   }
   return NULL;
}


/**
 * Free/destroy all XMesaBuffers associated with given display.
 */
void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
{
   XMesaBuffer b, next;
   for (b = XMesaBufferList; b; b = next) {
      next = b->Next;
      if (b->xm_visual->display == dpy) {
         xmesa_free_buffer(b);
      }
   }
}


/*
 * Look for XMesaBuffers whose X window has been destroyed.
 * Deallocate any such XMesaBuffers.
 */
void XMesaGarbageCollect( void )
{
   XMesaBuffer b, next;
   for (b=XMesaBufferList; b; b=next) {
      next = b->Next;
      if (b->xm_visual &&
          b->xm_visual->display &&
          b->drawable &&
          b->type == WINDOW) {
#ifdef XFree86Server
	 /* NOT_NEEDED */
#else
         XSync(b->xm_visual->display, False);
         if (!window_exists( b->xm_visual->display, b->drawable )) {
            /* found a dead window, free the ancillary info */
            XMesaDestroyBuffer( b );
         }
#endif
      }
   }
}


unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
                                GLfloat red, GLfloat green,
                                GLfloat blue, GLfloat alpha )
{
   /* no longer supported */
   return 0;
}


/*
 * This is typically called when the window size changes and we need
 * to reallocate the buffer's back/depth/stencil/accum buffers.
 */
PUBLIC void
XMesaResizeBuffers( XMesaBuffer b )
{
   GET_CURRENT_CONTEXT(ctx);
   XMesaContext xmctx = xmesa_context(ctx);
   if (!xmctx)
      return;
   xmesa_check_and_update_buffer_size(xmctx, b);
}




PUBLIC void
XMesaBindTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer,
                  const int *attrib_list)
{
}



PUBLIC void
XMesaReleaseTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer)
{
}