aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/mesa/drivers/dri/common/dri_util.c
blob: db44eede651168185ee04a53f4557631aa508c37 (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
/*
 * (C) Copyright IBM Corporation 2002, 2004
 * 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
 * on 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
 * THE AUTHORS AND/OR THEIR 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.
 */

/**
 * \file dri_util.c
 * DRI utility functions.
 *
 * This module acts as glue between GLX and the actual hardware driver.  A DRI
 * driver doesn't really \e have to use any of this - it's optional.  But, some
 * useful stuff is done here that otherwise would have to be duplicated in most
 * drivers.
 * 
 * Basically, these utility functions take care of some of the dirty details of
 * screen initialization, context creation, context binding, DRM setup, etc.
 *
 * These functions are compiled into each DRI driver so libGL.so knows nothing
 * about them.
 */


#include <stdbool.h>
#ifndef __NOT_HAVE_DRM_H
#include <xf86drm.h>
#endif
#include "dri_util.h"
#include "utils.h"
#include "xmlpool.h"
#include "../glsl/glsl_parser_extras.h"
#include "main/mtypes.h"
#include "main/version.h"
#include "main/macros.h"

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

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

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

    for (i = 0; extensions[i]; i++) {
	if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
	    psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
	if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)
	    psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];
	if (strcmp(extensions[i]->name, __DRI_USE_INVALIDATE) == 0)
	    psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];
	if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
	    psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
    }
}

/**
 * This is the first entrypoint in the driver called by the DRI driver loader
 * after dlopen()ing it.
 *
 * It's used to create global state for the driver across contexts on the same
 * Display.
 */
static __DRIscreen *
dri2CreateNewScreen(int scrn, int fd,
		    const __DRIextension **extensions,
		    const __DRIconfig ***driver_configs, void *data)
{
    static const __DRIextension *emptyExtensionList[] = { NULL };
    __DRIscreen *psp;

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

    psp->driver = &driDriverAPI;

    setupLoaderExtensions(psp, extensions);

#ifndef __NOT_HAVE_DRM_H
    if (fd != -1) {
       drmVersionPtr version = drmGetVersion(fd);
       if (version) {
          psp->drm_version.major = version->version_major;
          psp->drm_version.minor = version->version_minor;
          psp->drm_version.patch = version->version_patchlevel;
          drmFreeVersion(version);
       }
    }
#endif

    psp->loaderPrivate = data;

    psp->extensions = emptyExtensionList;
    psp->fd = fd;
    psp->myNum = scrn;

    *driver_configs = psp->driver->InitScreen(psp);
    if (*driver_configs == NULL) {
	free(psp);
	return NULL;
    }

    int gl_version_override = _mesa_get_gl_version_override();
    if (gl_version_override >= 31) {
       psp->max_gl_core_version = MAX2(psp->max_gl_core_version,
                                       gl_version_override);
    } else {
       psp->max_gl_compat_version = MAX2(psp->max_gl_compat_version,
                                         gl_version_override);
    }

    psp->api_mask = (1 << __DRI_API_OPENGL);
    if (psp->max_gl_core_version > 0)
       psp->api_mask |= (1 << __DRI_API_OPENGL_CORE);
    if (psp->max_gl_es1_version > 0)
       psp->api_mask |= (1 << __DRI_API_GLES);
    if (psp->max_gl_es2_version > 0)
       psp->api_mask |= (1 << __DRI_API_GLES2);
    if (psp->max_gl_es2_version >= 30)
       psp->api_mask |= (1 << __DRI_API_GLES3);

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


    return psp;
}

/** swrast driver createNewScreen entrypoint. */
static __DRIscreen *
driCreateNewScreen(int scrn, const __DRIextension **extensions,
		   const __DRIconfig ***driver_configs, void *data)
{
   return dri2CreateNewScreen(scrn, -1, extensions, driver_configs, data);
}

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

       _mesa_destroy_shader_compiler();

	psp->driver->DestroyScreen(psp);

	driDestroyOptionCache(&psp->optionCache);
	driDestroyOptionInfo(&psp->optionInfo);

	free(psp);
    }
}

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

/*@}*/


static bool
validate_context_version(__DRIscreen *screen,
                         int mesa_api,
                         unsigned major_version,
                         unsigned minor_version,
                         unsigned *dri_ctx_error)
{
   unsigned req_version = 10 * major_version + minor_version;
   unsigned max_version = 0;

   switch (mesa_api) {
   case API_OPENGL_COMPAT:
      max_version = screen->max_gl_compat_version;
      break;
   case API_OPENGL_CORE:
      max_version = screen->max_gl_core_version;
      break;
   case API_OPENGLES:
      max_version = screen->max_gl_es1_version;
      break;
   case API_OPENGLES2:
      max_version = screen->max_gl_es2_version;
      break;
   default:
      max_version = 0;
      break;
   }

   if (max_version == 0) {
      *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
      return false;
   } else if (req_version > max_version) {
      *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
      return false;
   }

   return true;
}

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

static __DRIcontext *
dri2CreateContextAttribs(__DRIscreen *screen, int api,
			 const __DRIconfig *config,
			 __DRIcontext *shared,
			 unsigned num_attribs,
			 const uint32_t *attribs,
			 unsigned *error,
			 void *data)
{
    __DRIcontext *context;
    const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
    void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
    gl_api mesa_api;
    unsigned major_version = 1;
    unsigned minor_version = 0;
    uint32_t flags = 0;

    assert((num_attribs == 0) || (attribs != NULL));

    if (!(screen->api_mask & (1 << api))) {
	*error = __DRI_CTX_ERROR_BAD_API;
	return NULL;
    }

    switch (api) {
    case __DRI_API_OPENGL:
	mesa_api = API_OPENGL_COMPAT;
	break;
    case __DRI_API_GLES:
	mesa_api = API_OPENGLES;
	break;
    case __DRI_API_GLES2:
    case __DRI_API_GLES3:
	mesa_api = API_OPENGLES2;
	break;
    case __DRI_API_OPENGL_CORE:
        mesa_api = API_OPENGL_CORE;
        break;
    default:
	*error = __DRI_CTX_ERROR_BAD_API;
	return NULL;
    }

    for (unsigned i = 0; i < num_attribs; i++) {
	switch (attribs[i * 2]) {
	case __DRI_CTX_ATTRIB_MAJOR_VERSION:
	    major_version = attribs[i * 2 + 1];
	    break;
	case __DRI_CTX_ATTRIB_MINOR_VERSION:
	    minor_version = attribs[i * 2 + 1];
	    break;
	case __DRI_CTX_ATTRIB_FLAGS:
	    flags = attribs[i * 2 + 1];
	    break;
	default:
	    /* We can't create a context that satisfies the requirements of an
	     * attribute that we don't understand.  Return failure.
	     */
	    assert(!"Should not get here.");
	    *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
	    return NULL;
	}
    }

    /* Mesa does not support the GL_ARB_compatibilty extension or the
     * compatibility profile.  This means that we treat a API_OPENGL_COMPAT 3.1 as
     * API_OPENGL_CORE and reject API_OPENGL_COMPAT 3.2+.
     */
    if (mesa_api == API_OPENGL_COMPAT && major_version == 3 && minor_version == 1)
       mesa_api = API_OPENGL_CORE;

    if (mesa_api == API_OPENGL_COMPAT
        && ((major_version > 3)
            || (major_version == 3 && minor_version >= 2))) {
       *error = __DRI_CTX_ERROR_BAD_API;
       return NULL;
    }

    /* The EGL_KHR_create_context spec says:
     *
     *     "Flags are only defined for OpenGL context creation, and specifying
     *     a flags value other than zero for other types of contexts,
     *     including OpenGL ES contexts, will generate an error."
     *
     * The GLX_EXT_create_context_es2_profile specification doesn't say
     * anything specific about this case.  However, none of the known flags
     * have any meaning in an ES context, so this seems safe.
     */
    if (mesa_api != API_OPENGL_COMPAT
        && mesa_api != API_OPENGL_CORE
        && flags != 0) {
	*error = __DRI_CTX_ERROR_BAD_FLAG;
	return NULL;
    }

    /* There are no forward-compatible contexts before OpenGL 3.0.  The
     * GLX_ARB_create_context spec says:
     *
     *     "Forward-compatible contexts are defined only for OpenGL versions
     *     3.0 and later."
     *
     * Forward-looking contexts are supported by silently converting the
     * requested API to API_OPENGL_CORE.
     *
     * In Mesa, a debug context is the same as a regular context.
     */
    if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
       mesa_api = API_OPENGL_CORE;
    }

    if ((flags & ~(__DRI_CTX_FLAG_DEBUG | __DRI_CTX_FLAG_FORWARD_COMPATIBLE))
        != 0) {
	*error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
	return NULL;
    }

    if (!validate_context_version(screen, mesa_api,
                                  major_version, minor_version, error))
       return NULL;

    context = calloc(1, sizeof *context);
    if (!context) {
	*error = __DRI_CTX_ERROR_NO_MEMORY;
	return NULL;
    }

    context->loaderPrivate = data;

    context->driScreenPriv = screen;
    context->driDrawablePriv = NULL;
    context->driReadablePriv = NULL;

    if (!screen->driver->CreateContext(mesa_api, modes, context,
                                       major_version, minor_version,
                                       flags, error, shareCtx) ) {
        free(context);
        return NULL;
    }

    struct gl_context *ctx = context->driverPrivate;
    if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0)
        ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
    if ((flags & __DRI_CTX_FLAG_DEBUG) != 0) {
        ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
        ctx->Debug.DebugOutput = GL_TRUE;
    }

    *error = __DRI_CTX_ERROR_SUCCESS;
    return context;
}

static __DRIcontext *
dri2CreateNewContextForAPI(__DRIscreen *screen, int api,
			   const __DRIconfig *config,
			   __DRIcontext *shared, void *data)
{
    unsigned error;

    return dri2CreateContextAttribs(screen, api, config, shared, 0, NULL,
				    &error, data);
}

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

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

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

/*@}*/


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

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

/**
 * This function takes both a read buffer and a draw buffer.  This is needed
 * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
 * function.
 */
static int driBindContext(__DRIcontext *pcp,
			  __DRIdrawable *pdp,
			  __DRIdrawable *prp)
{
    /*
    ** Assume error checking is done properly in glXMakeCurrent before
    ** calling driUnbindContext.
    */

    if (!pcp)
	return GL_FALSE;

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

    return pcp->driScreenPriv->driver->MakeCurrent(pcp, pdp, prp);
}

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

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

    if (pcp == NULL)
	return GL_FALSE;

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

    /* already unbound */
    if (!pdp && !prp)
	return GL_TRUE;

    pcp->driScreenPriv->driver->UnbindContext(pcp);

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

    dri_put_drawable(pdp);

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

	dri_put_drawable(prp);
    }

    pcp->driDrawablePriv = NULL;
    pcp->driReadablePriv = NULL;

    return GL_TRUE;
}

/*@}*/


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

static void dri_put_drawable(__DRIdrawable *pdp)
{
    if (pdp) {
	pdp->refcount--;
	if (pdp->refcount)
	    return;

	pdp->driScreenPriv->driver->DestroyBuffer(pdp);
	free(pdp);
    }
}

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

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

    pdraw->loaderPrivate = data;

    pdraw->driScreenPriv = screen;
    pdraw->driContextPriv = NULL;
    pdraw->refcount = 0;
    pdraw->lastStamp = 0;
    pdraw->w = 0;
    pdraw->h = 0;

    dri_get_drawable(pdraw);

    if (!screen->driver->CreateBuffer(screen, pdraw, &config->modes,
                                      GL_FALSE)) {
       free(pdraw);
       return NULL;
    }

    pdraw->dri2.stamp = pdraw->lastStamp + 1;

    return pdraw;
}

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

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

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


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

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

   return 0;
}

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

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

    return 0;
}

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

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

    return 0;
}

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

/**
 * swrast swapbuffers entrypoint.
 *
 * DRI2 implements this inside the loader with only flushes handled by the
 * driver.
 */
static void
driSwapBuffers(__DRIdrawable *pdp)
{
    assert(pdp->driScreenPriv->swrast_loader);

    pdp->driScreenPriv->driver->SwapBuffers(pdp);
}

/** Core interface */
const __DRIcoreExtension driCoreExtension = {
    .base = { __DRI_CORE, __DRI_CORE_VERSION },

    .createNewScreen            = NULL,
    .destroyScreen              = driDestroyScreen,
    .getExtensions              = driGetExtensions,
    .getConfigAttrib            = driGetConfigAttrib,
    .indexConfigAttrib          = driIndexConfigAttrib,
    .createNewDrawable          = NULL,
    .destroyDrawable            = driDestroyDrawable,
    .swapBuffers                = driSwapBuffers, /* swrast */
    .createNewContext           = dri2CreateNewContext, /* swrast */
    .copyContext                = driCopyContext,
    .destroyContext             = driDestroyContext,
    .bindContext                = driBindContext,
    .unbindContext              = driUnbindContext
};

/** DRI2 interface */
const __DRIdri2Extension driDRI2Extension = {
    .base = { __DRI_DRI2, 3 },

    .createNewScreen            = dri2CreateNewScreen,
    .createNewDrawable          = dri2CreateNewDrawable,
    .createNewContext           = dri2CreateNewContext,
    .getAPIMask                 = dri2GetAPIMask,
    .createNewContextForAPI     = dri2CreateNewContextForAPI,
    .allocateBuffer             = dri2AllocateBuffer,
    .releaseBuffer              = dri2ReleaseBuffer,
    .createContextAttribs       = dri2CreateContextAttribs
};

const __DRIswrastExtension driSWRastExtension = {
    { __DRI_SWRAST, __DRI_SWRAST_VERSION },
    driCreateNewScreen,
    dri2CreateNewDrawable,
    dri2CreateNewContextForAPI,
    dri2CreateContextAttribs
};

const __DRI2configQueryExtension dri2ConfigQueryExtension = {
   .base = { __DRI2_CONFIG_QUERY, __DRI2_CONFIG_QUERY_VERSION },

   .configQueryb        = dri2ConfigQueryb,
   .configQueryi        = dri2ConfigQueryi,
   .configQueryf        = dri2ConfigQueryf,
};

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

/**
 * Check that the gl_framebuffer associated with dPriv is the right size.
 * Resize the gl_framebuffer if needed.
 * It's expected that the dPriv->driverPrivate member points to a
 * gl_framebuffer object.
 */
void
driUpdateFramebufferSize(struct gl_context *ctx, const __DRIdrawable *dPriv)
{
   struct gl_framebuffer *fb = (struct gl_framebuffer *) dPriv->driverPrivate;
   if (fb && (dPriv->w != fb->Width || dPriv->h != fb->Height)) {
      ctx->Driver.ResizeBuffers(ctx, fb, dPriv->w, dPriv->h);
      /* if the driver needs the hw lock for ResizeBuffers, the drawable
         might have changed again by now */
      assert(fb->Width == dPriv->w);
      assert(fb->Height == dPriv->h);
   }
}