aboutsummaryrefslogtreecommitdiff
path: root/xorg-server/hw/kdrive/ephyr/ephyrhostglx.c
blob: 1eec4e02b3f6dbd840d11eb1111b7c155d6fadb0 (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
/*
 * Xephyr - A kdrive X server thats runs in a host X window.
 *          Authored by Matthew Allum <mallum@openedhand.com>
 * 
 * Copyright © 2007 OpenedHand Ltd 
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of OpenedHand Ltd not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission. OpenedHand Ltd makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * OpenedHand Ltd DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL OpenedHand Ltd BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 *
 * a lots of the content of this file has been adapted from the mesa source
 * code.
 * Authors:
 *    Dodji Seketeli <dodji@openedhand.com>
 */
#ifdef HAVE_CONFIG_H
#include <kdrive-config.h>
#endif

/*
 * including some server headers (like kdrive-config.h)
 * might define the macro _XSERVER64
 * on 64 bits machines. That macro must _NOT_ be defined for Xlib
 * client code, otherwise bad things happen.
 * So let's undef that macro if necessary.
 */
#ifdef _XSERVER64
#undef _XSERVER64
#endif

#include <X11/Xlibint.h>
#include <GL/glx.h>
#include <GL/internal/glcore.h>
#include <GL/glxproto.h>
#include <GL/glxint.h>
#include "ephyrhostglx.h"
#define _HAVE_XALLOC_DECLS
#include "ephyrlog.h"
#include "hostx.h"

#ifdef XEPHYR_DRI
enum VisualConfRequestType {
    EPHYR_GET_FB_CONFIG,
    EPHYR_VENDOR_PRIV_GET_FB_CONFIG_SGIX,
    EPHYR_GET_VISUAL_CONFIGS

};

static Bool ephyrHostGLXGetVisualConfigsInternal
                                        (enum VisualConfRequestType a_type,
                                         int32_t a_screen,
                                         int32_t *a_num_visuals,
                                         int32_t *a_num_props,
                                         int32_t *a_props_buf_size,
                                         int32_t **a_props_buf);
Bool
ephyrHostGLXGetMajorOpcode (int *a_opcode)
{
    Bool is_ok=FALSE ;
    Display *dpy=hostx_get_display () ;
    static int opcode ;
    int first_event_return=0, first_error_return=0;

    EPHYR_RETURN_VAL_IF_FAIL (dpy, FALSE) ;
    EPHYR_LOG ("enter\n") ;
    if (!opcode) {
        if (!XQueryExtension (dpy, GLX_EXTENSION_NAME, &opcode,
                              &first_event_return, &first_error_return)) {
            EPHYR_LOG_ERROR ("XQueryExtension() failed\n") ;
            goto out ;
        }
    }
    *a_opcode = opcode ;
    is_ok = TRUE ;
out:
    EPHYR_LOG ("release\n") ;
    return is_ok ;
}

Bool
ephyrHostGLXQueryVersion (int *a_major, int *a_minor)
{
    Bool is_ok = FALSE ;
    Display *dpy = hostx_get_display () ;
    int major_opcode=0;
    xGLXQueryVersionReq *req=NULL;
    xGLXQueryVersionReply reply;

    EPHYR_RETURN_VAL_IF_FAIL (a_major && a_minor, FALSE) ;
    EPHYR_LOG ("enter\n") ;

    if (!ephyrHostGLXGetMajorOpcode (&major_opcode)) {
        EPHYR_LOG_ERROR ("failed to get major opcode\n") ;
        goto out ;
    }
    EPHYR_LOG ("major opcode: %d\n", major_opcode) ;

    /* Send the glXQueryVersion request */
    memset (&reply, 0, sizeof (reply)) ;
    LockDisplay (dpy);
    GetReq (GLXQueryVersion, req);
    req->reqType = major_opcode;
    req->glxCode = X_GLXQueryVersion;
    req->majorVersion = 2;
    req->minorVersion = 1;
    _XReply(dpy, (xReply*) &reply, 0, False);
    UnlockDisplay (dpy);
    SyncHandle ();

    *a_major = reply.majorVersion ;
    *a_minor = reply.minorVersion ;

    EPHYR_LOG ("major:%d, minor:%d\n", *a_major, *a_minor) ;

    is_ok = TRUE ;
out:
    EPHYR_LOG ("leave\n") ;
    return is_ok ;
}

/**
 * GLX protocol structure for the ficticious "GXLGenericGetString" request.
 * 
 * This is a non-existant protocol packet.  It just so happens that all of
 * the real protocol packets used to request a string from the server have
 * an identical binary layout.  The only difference between them is the
 * meaning of the \c for_whom field and the value of the \c glxCode.
 * (this has been copied from the mesa source code)
 */
typedef struct GLXGenericGetString {
    CARD8 reqType;
    CARD8 glxCode;
    CARD16 length B16;
    CARD32 for_whom B32;
    CARD32 name B32;
} xGLXGenericGetStringReq;

/* These defines are only needed to make the GetReq macro happy.
 */
#define sz_xGLXGenericGetStringReq 12
#define X_GLXGenericGetString 0

Bool
ephyrHostGLXGetStringFromServer (int a_screen_number,
                                 int a_string_name,
                                 enum EphyrHostGLXGetStringOps a_op,
                                 char **a_string)
{
    Bool is_ok=FALSE ;
    Display *dpy = hostx_get_display () ;
    int default_screen = DefaultScreen (dpy);
    xGLXGenericGetStringReq *req=NULL;
    xGLXSingleReply reply;
    int length=0, numbytes=0, major_opcode=0, get_string_op=0;

    EPHYR_RETURN_VAL_IF_FAIL (dpy && a_string, FALSE) ;

    EPHYR_LOG ("enter\n") ;
    switch (a_op) {
        case EPHYR_HOST_GLX_QueryServerString:
            get_string_op = X_GLXQueryServerString;
            break ;
        case EPHYR_HOST_GLX_GetString:
            get_string_op = X_GLsop_GetString;
            EPHYR_LOG ("Going to glXGetString. strname:%#x, ctxttag:%d\n",
                       a_string_name, a_screen_number) ;
            break ;
        default:
            EPHYR_LOG_ERROR ("unknown EphyrHostGLXGetStringOp:%d\n", a_op) ;
            goto out ;
    }

    if (!ephyrHostGLXGetMajorOpcode (&major_opcode)) {
        EPHYR_LOG_ERROR ("failed to get major opcode\n") ;
        goto out ;
    }
    EPHYR_LOG ("major opcode: %d\n", major_opcode) ;

    LockDisplay (dpy);

    /* All of the GLX protocol requests for getting a string from the server
     * look the same.  The exact meaning of the a_for_whom field is usually
     * either the screen number (for glXQueryServerString) or the context tag
     * (for GLXSingle).
     */
    GetReq (GLXGenericGetString, req);
    req->reqType = major_opcode;
    req->glxCode = get_string_op;
    req->for_whom = default_screen;
    req->name = a_string_name;

    _XReply (dpy, (xReply *)&reply, 0, False);

    length = reply.length * 4;
    if (!length) {
        numbytes = 0;
    } else {
        numbytes = reply.size;
    }
    EPHYR_LOG ("going to get a string of size:%d\n", numbytes) ;

    *a_string = (char *) Xmalloc (numbytes +1);
    if (!a_string) {
        EPHYR_LOG_ERROR ("allocation failed\n") ;
        goto out;
    }

    memset (*a_string, 0, numbytes+1) ;
    if (_XRead (dpy, *a_string, numbytes)) {
        UnlockDisplay (dpy);
        SyncHandle ();
        EPHYR_LOG_ERROR ("read failed\n") ;
        goto out ;
    }
    length -= numbytes;
    _XEatData (dpy, length) ;
    UnlockDisplay (dpy);
    SyncHandle ();
    EPHYR_LOG ("strname:%#x, strvalue:'%s', strlen:%d\n",
               a_string_name, *a_string, numbytes) ;

    is_ok = TRUE ;
out:
    EPHYR_LOG ("leave\n") ;
    return is_ok ;
}

static Bool
ephyrHostGLXGetVisualConfigsInternal (enum VisualConfRequestType a_type,
                                      int32_t a_screen,
                                      int32_t *a_num_visuals,
                                      int32_t *a_num_props,
                                      int32_t *a_props_buf_size,
                                      int32_t **a_props_buf)
{
    Bool is_ok = FALSE ;
    Display *dpy = hostx_get_display () ;
    xGLXGetVisualConfigsReq *req;
    xGLXGetFBConfigsReq *fb_req;
    xGLXVendorPrivateWithReplyReq *vpreq;
    xGLXGetFBConfigsSGIXReq *sgi_req;
    xGLXGetVisualConfigsReply reply;
    char *server_glx_version=NULL,
         *server_glx_extensions=NULL ;
    int j=0,
        screens=0,
        major_opcode=0,
        num_props=0,
        num_visuals=0,
        props_buf_size=0,
        props_per_visual_size=0;
    int32_t *props_buf=NULL;

    EPHYR_RETURN_VAL_IF_FAIL (dpy, FALSE) ;

    screens = ScreenCount (dpy);
    if (!ephyrHostGLXGetMajorOpcode (&major_opcode)) {
        EPHYR_LOG_ERROR ("failed to get opcode\n") ;
        goto out ;
    }

    LockDisplay(dpy);
    switch (a_type) {
        case EPHYR_GET_FB_CONFIG:
        GetReq(GLXGetFBConfigs,fb_req);
        fb_req->reqType = major_opcode;
        fb_req->glxCode = X_GLXGetFBConfigs;
        fb_req->screen = DefaultScreen (dpy);
        break;

        case EPHYR_VENDOR_PRIV_GET_FB_CONFIG_SGIX:
        GetReqExtra(GLXVendorPrivateWithReply,
                    sz_xGLXGetFBConfigsSGIXReq
                         -
                    sz_xGLXVendorPrivateWithReplyReq,
                    vpreq);
        sgi_req = (xGLXGetFBConfigsSGIXReq *) vpreq;
        sgi_req->reqType = major_opcode;
        sgi_req->glxCode = X_GLXVendorPrivateWithReply;
        sgi_req->vendorCode = X_GLXvop_GetFBConfigsSGIX;
        sgi_req->screen = DefaultScreen (dpy);
        break;

        case EPHYR_GET_VISUAL_CONFIGS:
        GetReq(GLXGetVisualConfigs,req);
        req->reqType = major_opcode;
        req->glxCode = X_GLXGetVisualConfigs;
        req->screen = DefaultScreen (dpy);
        break;
    }

    if (!_XReply(dpy, (xReply*) &reply, 0, False)) {
        EPHYR_LOG_ERROR ("unknown error\n") ;
        UnlockDisplay(dpy);
        goto out ;
    }
   if (!reply.numVisuals) {
        EPHYR_LOG_ERROR ("screen does not support GL rendering\n") ;
        UnlockDisplay(dpy);
        goto out ;
    }
   num_visuals = reply.numVisuals ;

    /* FIXME: Is the __GLX_MIN_CONFIG_PROPS test correct for
     * FIXME: FBconfigs? 
     */
    /* Check number of properties */
    num_props = reply.numProps;
    if ((num_props < __GLX_MIN_CONFIG_PROPS) ||
        (num_props > __GLX_MAX_CONFIG_PROPS)) {
        /* Huh?  Not in protocol defined limits.  Punt */
        EPHYR_LOG_ERROR ("got a bad reply to request\n") ;
        UnlockDisplay(dpy);
        goto out ;
    }

    if (a_type != EPHYR_GET_VISUAL_CONFIGS) {
        num_props *= 2;
    }
    props_per_visual_size = num_props * __GLX_SIZE_INT32;
    props_buf_size = props_per_visual_size * reply.numVisuals;
    props_buf = malloc (props_buf_size) ;
    for (j = 0; j < reply.numVisuals; j++) {
        if (_XRead (dpy,
                    &((char*)props_buf)[j*props_per_visual_size],
                    props_per_visual_size) != Success) {
            EPHYR_LOG_ERROR ("read failed\n") ;
        }
    }
    UnlockDisplay(dpy);

    *a_num_visuals = num_visuals ;
    *a_num_props = reply.numProps ;
    *a_props_buf_size = props_buf_size ;
    *a_props_buf = props_buf ;
    is_ok = TRUE ;

out:
    if (server_glx_version) {
        XFree (server_glx_version) ;
        server_glx_version = NULL ;
    }
    if (server_glx_extensions) {
        XFree (server_glx_extensions) ;
        server_glx_extensions = NULL ;
    }
    SyncHandle () ;
    return is_ok;
}

Bool
ephyrHostGLXGetVisualConfigs (int32_t a_screen,
                              int32_t *a_num_visuals,
                              int32_t *a_num_props,
                              int32_t *a_props_buf_size,
                              int32_t **a_props_buf)
{
    Bool is_ok = FALSE;

    EPHYR_LOG ("enter\n") ;
    is_ok = ephyrHostGLXGetVisualConfigsInternal (EPHYR_GET_VISUAL_CONFIGS,
                                                  a_screen,
                                                  a_num_visuals,
                                                  a_num_props,
                                                  a_props_buf_size,
                                                  a_props_buf) ;

    EPHYR_LOG ("leave:%d\n", is_ok) ;
    return is_ok;
}

Bool
ephyrHostGLXVendorPrivGetFBConfigsSGIX (int a_screen,
                                        int32_t *a_num_visuals,
                                        int32_t *a_num_props,
                                        int32_t *a_props_buf_size,
                                        int32_t **a_props_buf)
{
    Bool is_ok=FALSE ;
    EPHYR_LOG ("enter\n") ;
    is_ok = ephyrHostGLXGetVisualConfigsInternal
                                        (EPHYR_VENDOR_PRIV_GET_FB_CONFIG_SGIX,
                                         a_screen,
                                         a_num_visuals,
                                         a_num_props,
                                         a_props_buf_size,
                                         a_props_buf) ;
    EPHYR_LOG ("leave\n") ;
    return is_ok ;
}

Bool
ephyrHostGLXSendClientInfo (int32_t a_major, int32_t a_minor,
                            const char* a_extension_list)
{
    Bool is_ok = FALSE ;
    Display *dpy = hostx_get_display () ;
    xGLXClientInfoReq *req;
    int size;
    int32_t major_opcode=0 ;

    EPHYR_RETURN_VAL_IF_FAIL (dpy && a_extension_list, FALSE) ;

    if (!ephyrHostGLXGetMajorOpcode (&major_opcode)) {
        EPHYR_LOG_ERROR ("failed to get major opcode\n") ;
        goto out ;
    }

    LockDisplay (dpy);

    GetReq (GLXClientInfo,req);
    req->reqType = major_opcode;
    req->glxCode = X_GLXClientInfo;
    req->major = a_major;
    req->minor = a_minor;

    size = strlen (a_extension_list) + 1;
    req->length += (size + 3) >> 2;
    req->numbytes = size;
    Data (dpy, a_extension_list, size);

    UnlockDisplay(dpy);
    SyncHandle();

    is_ok=TRUE ;

out:
    return is_ok ;
}

Bool
ephyrHostGLXCreateContext (int a_screen,
                           int a_visual_id,
                           int a_context_id,
                           int a_share_list_ctxt_id,
                           Bool a_direct)
{
    Bool is_ok = FALSE;
    Display *dpy = hostx_get_display ();
    int major_opcode=0, remote_context_id=0;
    xGLXCreateContextReq *req;

    EPHYR_LOG ("enter. screen:%d, visual:%d, contextid:%d, direct:%d\n",
               a_screen, a_visual_id, a_context_id, a_direct) ;

    if (!hostx_allocate_resource_id_peer (a_context_id, &remote_context_id)) {
        EPHYR_LOG_ERROR ("failed to peer the context id %d host X",
                         remote_context_id) ;
        goto out ;
    }

    if (!ephyrHostGLXGetMajorOpcode (&major_opcode)) {
        EPHYR_LOG_ERROR ("failed to get major opcode\n") ;
        goto out ;
    }

    LockDisplay (dpy) ;

    /* Send the glXCreateContext request */
    GetReq(GLXCreateContext,req);
    req->reqType = major_opcode;
    req->glxCode = X_GLXCreateContext;
    req->context = remote_context_id;
    req->visual = a_visual_id;
    req->screen = DefaultScreen (dpy);
    req->shareList = a_share_list_ctxt_id;
    req->isDirect = a_direct;

    UnlockDisplay (dpy);
    SyncHandle ();

    is_ok = TRUE ;

out:
    EPHYR_LOG ("leave\n") ;
    return is_ok ;
}

Bool
ephyrHostDestroyContext (int a_ctxt_id)
{
    Bool is_ok=FALSE;
    Display *dpy=hostx_get_display ();
    int major_opcode=0, remote_ctxt_id=0 ;
    xGLXDestroyContextReq *req=NULL;

    EPHYR_LOG ("enter:%d\n", a_ctxt_id) ;

    if (!ephyrHostGLXGetMajorOpcode (&major_opcode)) {
        EPHYR_LOG_ERROR ("failed to get major opcode\n") ;
        goto out ;
    }
    if (!hostx_get_resource_id_peer (a_ctxt_id, &remote_ctxt_id)) {
        EPHYR_LOG_ERROR ("failed to get remote glx ctxt id\n") ;
        goto out ;
    }
    EPHYR_LOG ("host context id:%d\n", remote_ctxt_id) ;

    LockDisplay (dpy);
    GetReq (GLXDestroyContext,req);
    req->reqType = major_opcode;
    req->glxCode = X_GLXDestroyContext;
    req->context = remote_ctxt_id;
    UnlockDisplay (dpy);
    SyncHandle ();

    is_ok = TRUE ;

out:
    EPHYR_LOG ("leave\n") ;
    return is_ok ;
}

Bool
ephyrHostGLXMakeCurrent (int a_drawable,
                         int a_glx_ctxt_id,
                         int a_old_ctxt_tag,
                         int *a_ctxt_tag)
{
    Bool is_ok=FALSE ;
    Display *dpy = hostx_get_display () ;
    int32_t major_opcode=0 ;
    int remote_glx_ctxt_id=0 ;
    xGLXMakeCurrentReq *req;
    xGLXMakeCurrentReply reply;

    EPHYR_RETURN_VAL_IF_FAIL (a_ctxt_tag, FALSE) ;

    EPHYR_LOG ("enter. drawable:%d, context:%d, oldtag:%d\n",
               a_drawable, a_glx_ctxt_id, a_old_ctxt_tag) ;

    if (!ephyrHostGLXGetMajorOpcode (&major_opcode)) {
        EPHYR_LOG_ERROR ("failed to get major opcode\n") ;
        goto out ;
    }
    if (!hostx_get_resource_id_peer (a_glx_ctxt_id, &remote_glx_ctxt_id)) {
        EPHYR_LOG_ERROR ("failed to get remote glx ctxt id\n") ;
        goto out ;
    }

    LockDisplay (dpy);

    GetReq (GLXMakeCurrent,req);
    req->reqType = major_opcode;
    req->glxCode = X_GLXMakeCurrent;
    req->drawable = a_drawable;
    req->context = remote_glx_ctxt_id;
    req->oldContextTag = a_old_ctxt_tag;

    memset (&reply, 0, sizeof (reply)) ;
    if (!_XReply (dpy, (xReply*)&reply, 0, False)) {
        EPHYR_LOG_ERROR ("failed to get reply from host\n") ;
        UnlockDisplay (dpy);
        SyncHandle ();
        goto out ;
    }
    UnlockDisplay (dpy);
    SyncHandle ();
    *a_ctxt_tag = reply.contextTag ;
    EPHYR_LOG ("context tag:%d\n", *a_ctxt_tag) ;
    is_ok = TRUE ;

out:
    EPHYR_LOG ("leave\n") ;
    return is_ok ;
}

#define X_GLXSingle 0

#define __EPHYR_GLX_SINGLE_PUT_CHAR(offset,a) \
    *((INT8 *) (pc + offset)) = a

#define EPHYR_GLX_SINGLE_PUT_SHORT(offset,a) \
    *((INT16 *) (pc + offset)) = a

#define EPHYR_GLX_SINGLE_PUT_LONG(offset,a) \
    *((INT32 *) (pc + offset)) = a

#define EPHYR_GLX_SINGLE_PUT_FLOAT(offset,a) \
    *((FLOAT32 *) (pc + offset)) = a

#define EPHYR_GLX_SINGLE_READ_XREPLY()       \
    (void) _XReply(dpy, (xReply*) &reply, 0, False)

#define EPHYR_GLX_SINGLE_GET_RETVAL(a,cast) \
    a = (cast) reply.retval

#define EPHYR_GLX_SINGLE_GET_SIZE(a) \
    a = (GLint) reply.size

#define EPHYR_GLX_SINGLE_GET_CHAR(p) \
    *p = *(GLbyte *)&reply.pad3;

#define EPHYR_GLX_SINGLE_GET_SHORT(p) \
    *p = *(GLshort *)&reply.pad3;

#define EPHYR_GLX_SINGLE_GET_LONG(p) \
    *p = *(GLint *)&reply.pad3;

#define EPHYR_GLX_SINGLE_GET_FLOAT(p) \
    *p = *(GLfloat *)&reply.pad3;

Bool
ephyrHostGetIntegerValue (int a_current_context_tag, int a_int, int *a_val)
{
    Bool is_ok=FALSE;
    Display *dpy = hostx_get_display () ;
    int major_opcode=0, size=0;
    xGLXSingleReq *req=NULL;
    xGLXSingleReply reply;
    unsigned char* pc=NULL ;

    EPHYR_RETURN_VAL_IF_FAIL (a_val, FALSE) ;

    EPHYR_LOG ("enter\n") ;
    if (!ephyrHostGLXGetMajorOpcode (&major_opcode)) {
        EPHYR_LOG_ERROR ("failed to get major opcode\n") ;
        goto out ;
    }
    LockDisplay (dpy) ;
    GetReqExtra (GLXSingle, 4, req) ;
    req->reqType = major_opcode ;
    req->glxCode = X_GLsop_GetIntegerv ;
    req->contextTag = a_current_context_tag;
    pc = ((unsigned char *)(req) + sz_xGLXSingleReq) ;
    EPHYR_GLX_SINGLE_PUT_LONG (0, a_int) ;
    EPHYR_GLX_SINGLE_READ_XREPLY () ;
    EPHYR_GLX_SINGLE_GET_SIZE (size) ;
    if (!size) {
        UnlockDisplay (dpy) ;
        SyncHandle () ;
        EPHYR_LOG_ERROR ("X_GLsop_GetIngerv failed\n") ;
        goto out ;
    }
    EPHYR_GLX_SINGLE_GET_LONG (a_val) ;
    UnlockDisplay (dpy) ;
    SyncHandle () ;
    is_ok = TRUE ;

out:
    EPHYR_LOG ("leave\n") ;
    return is_ok ;
}

Bool
ephyrHostIsContextDirect (int a_ctxt_id,
                          int *a_is_direct)
{
    Bool is_ok=FALSE;
    Display *dpy = hostx_get_display () ;
    xGLXIsDirectReq *req=NULL;
    xGLXIsDirectReply reply;
    int major_opcode=0, remote_glx_ctxt_id=0;

    EPHYR_LOG ("enter\n") ;
    if (!ephyrHostGLXGetMajorOpcode (&major_opcode)) {
        EPHYR_LOG_ERROR ("failed to get major opcode\n") ;
        goto out ;
    }
    if (!hostx_get_resource_id_peer (a_ctxt_id, &remote_glx_ctxt_id)) {
        EPHYR_LOG_ERROR ("failed to get remote glx ctxt id\n") ;
        goto out ;
    }
    memset (&reply, 0, sizeof (reply)) ;

    /* Send the glXIsDirect request */
    LockDisplay (dpy);
    GetReq (GLXIsDirect,req);
    req->reqType = major_opcode;
    req->glxCode = X_GLXIsDirect;
    req->context = remote_glx_ctxt_id;
    if (!_XReply (dpy, (xReply*) &reply, 0, False)) {
        EPHYR_LOG_ERROR ("fail in reading reply from host\n") ;
        UnlockDisplay (dpy);
        SyncHandle ();
        goto out ;
    }
    UnlockDisplay (dpy);
    SyncHandle ();
    *a_is_direct = reply.isDirect ;
    is_ok = TRUE ;

out:
    EPHYR_LOG ("leave\n") ;
    return is_ok ;
}

#endif /*XEPHYR_DRI*/