aboutsummaryrefslogtreecommitdiff
path: root/xorg-server/glx/glxext.c
blob: 31cdfb3c94cd1953d0c42187c55a369a09584cc7 (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
/*
 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
 * Copyright (C) 1991-2000 Silicon Graphics, Inc. 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 including the dates of first publication and
 * either this permission notice or a reference to
 * http://oss.sgi.com/projects/FreeB/
 * 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
 * SILICON GRAPHICS, INC. 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.
 *
 * Except as contained in this notice, the name of Silicon Graphics, Inc.
 * shall not be used in advertising or otherwise to promote the sale, use or
 * other dealings in this Software without prior written authorization from
 * Silicon Graphics, Inc.
 */

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

#include "glheader.h"

#endif

#include <string.h>
#include "glxserver.h"
#include <windowstr.h>
#include <propertyst.h>
#include <registry.h>
#include "privates.h"
#include <os.h>
#include "extinit.h"
#include "glx_extinit.h"
#include "unpack.h"
#include "glxutil.h"
#include "glxext.h"
#include "indirect_table.h"
#include "indirect_util.h"
#include "glapi.h"

/*
** The last context used by the server.  It is the context that is current
** from the server's perspective.
*/
__GLXcontext *__glXLastContext;

/*
** X resources.
*/
RESTYPE __glXContextRes;
RESTYPE __glXDrawableRes;

/*
** Reply for most singles.
*/
xGLXSingleReply __glXReply;

static DevPrivateKeyRec glxClientPrivateKeyRec;

#define glxClientPrivateKey (&glxClientPrivateKeyRec)

/*
** Forward declarations.
*/
static int __glXDispatch(ClientPtr);

/*
** Called when the extension is reset.
*/
static void
ResetExtension(ExtensionEntry * extEntry)
{
    __glXFlushContextCache();
}

/*
** Reset state used to keep track of large (multi-request) commands.
*/
void
__glXResetLargeCommandStatus(__GLXclientState * cl)
{
    cl->largeCmdBytesSoFar = 0;
    cl->largeCmdBytesTotal = 0;
    cl->largeCmdRequestsSoFar = 0;
    cl->largeCmdRequestsTotal = 0;
}

/*
 * This procedure is called when the client who created the context goes away
 * OR when glXDestroyContext is called.  In either case, all we do is flag that
 * the ID is no longer valid, and (maybe) free the context.
 */
static int
ContextGone(__GLXcontext * cx, XID id)
{
    cx->idExists = GL_FALSE;
    if (!cx->currentClient) {
        __glXFreeContext(cx);
    }

    return True;
}

static __GLXcontext *glxPendingDestroyContexts;
static __GLXcontext *glxAllContexts;
static int glxServerLeaveCount;
static int glxBlockClients;

/*
** Destroy routine that gets called when a drawable is freed.  A drawable
** contains the ancillary buffers needed for rendering.
*/
static Bool
DrawableGone(__GLXdrawable * glxPriv, XID xid)
{
    __GLXcontext *c, *next;

    if (glxPriv->type == GLX_DRAWABLE_WINDOW) {
        /* If this was created by glXCreateWindow, free the matching resource */
        if (glxPriv->drawId != glxPriv->pDraw->id) {
            if (xid == glxPriv->drawId)
                FreeResourceByType(glxPriv->pDraw->id, __glXDrawableRes, TRUE);
            else
                FreeResourceByType(glxPriv->drawId, __glXDrawableRes, TRUE);
        }
        /* otherwise this window was implicitly created by MakeCurrent */
    }

    for (c = glxAllContexts; c; c = next) {
        next = c->next;
        if (c->currentClient &&
		(c->drawPriv == glxPriv || c->readPriv == glxPriv)) {
            /* just force a re-bind the next time through */
            (*c->loseCurrent) (c);
            if (c == __glXLastContext)
                __glXFlushContextCache();
        }
        if (c->drawPriv == glxPriv)
            c->drawPriv = NULL;
        if (c->readPriv == glxPriv)
            c->readPriv = NULL;
    }

    /* drop our reference to any backing pixmap */
    if (glxPriv->type == GLX_DRAWABLE_PIXMAP)
        glxPriv->pDraw->pScreen->DestroyPixmap((PixmapPtr) glxPriv->pDraw);

    glxPriv->destroy(glxPriv);

    return True;
}

Bool
__glXAddContext(__GLXcontext * cx)
{
    /* Register this context as a resource.
     */
    if (!AddResource(cx->id, __glXContextRes, (void *)cx)) {
	return False;
    }

    cx->next = glxAllContexts;
    glxAllContexts = cx;
    return True;
}

static void
__glXRemoveFromContextList(__GLXcontext * cx)
{
    __GLXcontext *c, *prev;

    if (cx == glxAllContexts)
        glxAllContexts = cx->next;
    else {
        prev = glxAllContexts;
        for (c = glxAllContexts; c; c = c->next) {
            if (c == cx)
                prev->next = c->next;
            prev = c;
        }
    }
}

/*
** Free a context.
*/
GLboolean
__glXFreeContext(__GLXcontext * cx)
{
    if (cx->idExists || cx->currentClient)
        return GL_FALSE;

    __glXRemoveFromContextList(cx);

    free(cx->feedbackBuf);
    free(cx->selectBuf);
    if (cx == __glXLastContext) {
        __glXFlushContextCache();
    }

    /* We can get here through both regular dispatching from
     * __glXDispatch() or as a callback from the resource manager.  In
     * the latter case we need to lift the DRI lock manually. */

    if (!glxBlockClients) {
        __glXleaveServer(GL_FALSE);
        cx->destroy(cx);
        __glXenterServer(GL_FALSE);
    }
    else {
        cx->next = glxPendingDestroyContexts;
        glxPendingDestroyContexts = cx;
    }

    return GL_TRUE;
}

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

/*
** These routines can be used to check whether a particular GL command
** has caused an error.  Specifically, we use them to check whether a
** given query has caused an error, in which case a zero-length data
** reply is sent to the client.
*/

static GLboolean errorOccured = GL_FALSE;

/*
** The GL was will call this routine if an error occurs.
*/
void
__glXErrorCallBack(GLenum code)
{
    errorOccured = GL_TRUE;
}

/*
** Clear the error flag before calling the GL command.
*/
void
__glXClearErrorOccured(void)
{
    errorOccured = GL_FALSE;
}

/*
** Check if the GL command caused an error.
*/
GLboolean
__glXErrorOccured(void)
{
    return errorOccured;
}

static int __glXErrorBase;
int __glXEventBase;

int
__glXError(int error)
{
    return __glXErrorBase + error;
}

__GLXclientState *
glxGetClient(ClientPtr pClient)
{
    return dixLookupPrivate(&pClient->devPrivates, glxClientPrivateKey);
}

static void
glxClientCallback(CallbackListPtr *list, void *closure, void *data)
{
    NewClientInfoRec *clientinfo = (NewClientInfoRec *) data;
    ClientPtr pClient = clientinfo->client;
    __GLXclientState *cl = glxGetClient(pClient);
    __GLXcontext *c, *next;

    switch (pClient->clientState) {
    case ClientStateRunning:
        cl->client = pClient;
        break;

    case ClientStateGone:
        /* detach from all current contexts */
        for (c = glxAllContexts; c; c = next) {
            next = c->next;
            if (c->currentClient == pClient) {
                c->loseCurrent(c);
                c->currentClient = NULL;
                __glXFreeContext(c);
            }
        }

        free(cl->returnBuf);
        free(cl->largeCmdBuf);
        free(cl->GLClientextensions);
        break;

    default:
        break;
    }
}

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

static __GLXprovider *__glXProviderStack;

void
GlxPushProvider(__GLXprovider * provider)
{
    provider->next = __glXProviderStack;
    __glXProviderStack = provider;
}

/*
** Initialize the GLX extension.
*/
void
GlxExtensionInit(void)
{
    ExtensionEntry *extEntry;
    ScreenPtr pScreen;
    int i;
    __GLXprovider *p, **stack;
    Bool glx_provided = False;

    if (serverGeneration == 1) {
        for (stack = &__glXProviderStack; *stack; stack = &(*stack)->next)
            ;
        *stack = &__glXDRISWRastProvider;
    }

    __glXContextRes = CreateNewResourceType((DeleteType) ContextGone,
                                            "GLXContext");
    __glXDrawableRes = CreateNewResourceType((DeleteType) DrawableGone,
                                             "GLXDrawable");
    if (!__glXContextRes || !__glXDrawableRes)
        return;

    if (!dixRegisterPrivateKey
        (&glxClientPrivateKeyRec, PRIVATE_CLIENT, sizeof(__GLXclientState)))
        return;
    if (!AddCallback(&ClientStateCallback, glxClientCallback, 0))
        return;

    for (i = 0; i < screenInfo.numScreens; i++) {
        pScreen = screenInfo.screens[i];

        for (p = __glXProviderStack; p != NULL; p = p->next) {
            __GLXscreen *glxScreen;

            glxScreen = p->screenProbe(pScreen);
            if (glxScreen != NULL) {
                if (glxScreen->GLXminor < glxMinorVersion)
                    glxMinorVersion = glxScreen->GLXminor;
                LogMessage(X_INFO,
                           "GLX: Initialized %s GL provider for screen %d\n",
                           p->name, i);
                break;
            }

        }

        if (!p)
            LogMessage(X_INFO,
                       "GLX: no usable GL providers found for screen %d\n", i);
        else
            glx_provided = True;
    }

    /* don't register extension if GL is not provided on any screen */
    if (!glx_provided)
        return;

    /*
     ** Add extension to server extensions.
     */
    extEntry = AddExtension(GLX_EXTENSION_NAME, __GLX_NUMBER_EVENTS,
                            __GLX_NUMBER_ERRORS, __glXDispatch,
                            __glXDispatch, ResetExtension, StandardMinorOpcode);
    if (!extEntry) {
        FatalError("__glXExtensionInit: AddExtensions failed\n");
        return;
    }
    if (!AddExtensionAlias(GLX_EXTENSION_ALIAS, extEntry)) {
        ErrorF("__glXExtensionInit: AddExtensionAlias failed\n");
        return;
    }

    __glXErrorBase = extEntry->errorBase;
    __glXEventBase = extEntry->eventBase;
#if PRESENT
    __glXregisterPresentCompleteNotify();
#endif
}

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

void
__glXFlushContextCache(void)
{
    __glXLastContext = 0;
}

/*
** Make a context the current one for the GL (in this implementation, there
** is only one instance of the GL, and we use it to serve all GL clients by
** switching it between different contexts).  While we are at it, look up
** a context by its tag and return its (__GLXcontext *).
*/
__GLXcontext *
__glXForceCurrent(__GLXclientState * cl, GLXContextTag tag, int *error)
{
    __GLXcontext *cx;

    /*
     ** See if the context tag is legal; it is managed by the extension,
     ** so if it's invalid, we have an implementation error.
     */
    cx = __glXLookupContextByTag(cl, tag);
    if (!cx) {
        cl->client->errorValue = tag;
        *error = __glXError(GLXBadContextTag);
        return 0;
    }

    if (!cx->isDirect) {
        if (cx->drawPriv == NULL) {
            /*
             ** The drawable has vanished.  It must be a window, because only
             ** windows can be destroyed from under us; GLX pixmaps are
             ** refcounted and don't go away until no one is using them.
             */
            *error = __glXError(GLXBadCurrentWindow);
            return 0;
        }
    }

    if (cx->wait && (*cx->wait) (cx, cl, error))
        return NULL;

    if (cx == __glXLastContext && GET_DISPATCH()) {
        /* No need to re-bind */
        return cx;
    }

    /* Make this context the current one for the GL. */
    if (!cx->isDirect) {
        if (!(*cx->makeCurrent) (cx)) {
            /* Bind failed, and set the error code.  Bummer */
            cl->client->errorValue = cx->id;
            *error = __glXError(GLXBadContextState);
            return 0;
        }
    }
    __glXLastContext = cx;
    return cx;
}

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

void
glxSuspendClients(void)
{
    int i;

    for (i = 1; i < currentMaxClients; i++) {
        if (clients[i] && glxGetClient(clients[i])->inUse)
            IgnoreClient(clients[i]);
    }

    glxBlockClients = TRUE;
}

void
glxResumeClients(void)
{
    __GLXcontext *cx, *next;
    int i;

    glxBlockClients = FALSE;

    for (i = 1; i < currentMaxClients; i++) {
        if (clients[i] && glxGetClient(clients[i])->inUse)
            AttendClient(clients[i]);
    }

    __glXleaveServer(GL_FALSE);
    for (cx = glxPendingDestroyContexts; cx != NULL; cx = next) {
        next = cx->next;

        cx->destroy(cx);
    }
    glxPendingDestroyContexts = NULL;
    __glXenterServer(GL_FALSE);
}

static void
__glXnopEnterServer(GLboolean rendering)
{
}

static void
__glXnopLeaveServer(GLboolean rendering)
{
}

static void (*__glXenterServerFunc) (GLboolean) = __glXnopEnterServer;
static void (*__glXleaveServerFunc) (GLboolean) = __glXnopLeaveServer;

void
__glXsetEnterLeaveServerFuncs(void (*enter) (GLboolean),
                              void (*leave) (GLboolean))
{
    __glXenterServerFunc = enter;
    __glXleaveServerFunc = leave;
}

void
__glXenterServer(GLboolean rendering)
{
    glxServerLeaveCount--;

    if (glxServerLeaveCount == 0)
        (*__glXenterServerFunc) (rendering);
}

void
__glXleaveServer(GLboolean rendering)
{
    if (glxServerLeaveCount == 0)
        (*__glXleaveServerFunc) (rendering);

    glxServerLeaveCount++;
}

static glx_gpa_proc _get_proc_address;

void
__glXsetGetProcAddress(glx_gpa_proc get_proc_address)
{
    _get_proc_address = get_proc_address;
}

void *__glGetProcAddress(const char *proc)
{
    void *ret = _get_proc_address(proc);

    return ret ? ret : NoopDDA;
}

/*
** Top level dispatcher; all commands are executed from here down.
*/
static int
__glXDispatch(ClientPtr client)
{
    REQUEST(xGLXSingleReq);
    CARD8 opcode;
    __GLXdispatchSingleProcPtr proc;
    __GLXclientState *cl;
    int retval;

    opcode = stuff->glxCode;
    cl = glxGetClient(client);
    /* Mark it in use so we suspend it on VT switch. */
    cl->inUse = TRUE;

    /*
     ** If we're expecting a glXRenderLarge request, this better be one.
     */
    if ((cl->largeCmdRequestsSoFar != 0) && (opcode != X_GLXRenderLarge)) {
        client->errorValue = stuff->glxCode;
        return __glXError(GLXBadLargeRequest);
    }

    /* If we're currently blocking GLX clients, just put this guy to
     * sleep, reset the request and return. */
    if (glxBlockClients) {
        ResetCurrentRequest(client);
        client->sequence--;
        IgnoreClient(client);
        return Success;
    }

    /*
     ** Use the opcode to index into the procedure table.
     */
    proc = __glXGetProtocolDecodeFunction(&Single_dispatch_info, opcode,
                                          client->swapped);
    if (proc != NULL) {
        GLboolean rendering = opcode <= X_GLXRenderLarge;

        __glXleaveServer(rendering);

        retval = (*proc) (cl, (GLbyte *) stuff);

        __glXenterServer(rendering);
    }
    else {
        retval = BadRequest;
    }

    return retval;
}