src/mesa/drivers/dri/common/dri_util.c

   1 /*
   2  * (C) Copyright IBM Corporation 2002, 2004
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * on the rights to use, copy, modify, merge, publish, distribute, sub
   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file dri_util.c
  27  * DRI utility functions.
  28  *
  29  * This module acts as glue between GLX and the actual hardware driver.  A DRI
  30  * driver doesn't really \e have to use any of this - it's optional.  But, some
  31  * useful stuff is done here that otherwise would have to be duplicated in most
  32  * drivers.
  33  *
  34  * Basically, these utility functions take care of some of the dirty details of
  35  * screen initialization, context creation, context binding, DRM setup, etc.
  36  *
  37  * These functions are compiled into each DRI driver so libGL.so knows nothing
  38  * about them.
  39  */
  40
  41
  42 #include <stdbool.h>
  43 #ifndef __NOT_HAVE_DRM_H
  44 #include <xf86drm.h>
  45 #endif
  46 #include "dri_util.h"
  47 #include "utils.h"
  48 #include "xmlpool.h"
  49 #include "../glsl/glsl_parser_extras.h"
  50 #include "main/version.h"
  51 #include "main/macros.h"
  52
  53 PUBLIC const char __dri2ConfigOptions[] =
  54    DRI_CONF_BEGIN
  55       DRI_CONF_SECTION_PERFORMANCE
  56          DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_1)
  57       DRI_CONF_SECTION_END
  58    DRI_CONF_END;
  59
  60 /*****************************************************************/
  61 /** \name Screen handling functions                              */
  62 /*****************************************************************/
  63 /*@{*/
  64
  65 static void
  66 setupLoaderExtensions(__DRIscreen *psp,
  67                       const __DRIextension **extensions)
  68 {
  69     int i;
  70
  71     for (i = 0; extensions[i]; i++) {
  72         if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
  73             psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
  74         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)
  75             psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];
  76         if (strcmp(extensions[i]->name, __DRI_USE_INVALIDATE) == 0)
  77             psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];
  78         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
  79             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
  80     }
  81 }
  82
  83 /**
  84  * This is the first entrypoint in the driver called by the DRI driver loader
  85  * after dlopen()ing it.
  86  *
  87  * It's used to create global state for the driver across contexts on the same
  88  * Display.
  89  */
  90 static __DRIscreen *
  91 dri2CreateNewScreen(int scrn, int fd,
  92                     const __DRIextension **extensions,
  93                     const __DRIconfig ***driver_configs, void *data)
  94 {
  95     static const __DRIextension *emptyExtensionList[] = { NULL };
  96     __DRIscreen *psp;
  97
  98     psp = calloc(1, sizeof(*psp));
  99     if (!psp)
 100         return NULL;
 101
 102     psp->driver = &driDriverAPI;
 103
 104     setupLoaderExtensions(psp, extensions);
 105
 106 #ifndef __NOT_HAVE_DRM_H
 107     if (fd != -1) {
 108        drmVersionPtr version = drmGetVersion(fd);
 109        if (version) {
 110           psp->drm_version.major = version->version_major;
 111           psp->drm_version.minor = version->version_minor;
 112           psp->drm_version.patch = version->version_patchlevel;
 113           drmFreeVersion(version);
 114        }
 115     }
 116 #endif
 117
 118     psp->loaderPrivate = data;
 119
 120     psp->extensions = emptyExtensionList;
 121     psp->fd = fd;
 122     psp->myNum = scrn;
 123
 124     *driver_configs = psp->driver->InitScreen(psp);
 125     if (*driver_configs == NULL) {
 126         free(psp);
 127         return NULL;
 128     }
 129
 130     int gl_version_override = _mesa_get_gl_version_override();
 131     if (gl_version_override >= 31) {
 132        psp->max_gl_core_version = MAX2(psp->max_gl_core_version,
 133                                        gl_version_override);
 134     } else {
 135        psp->max_gl_compat_version = MAX2(psp->max_gl_compat_version,
 136                                          gl_version_override);
 137     }
 138
 139     psp->api_mask = (1 << __DRI_API_OPENGL);
 140     if (psp->max_gl_core_version > 0)
 141        psp->api_mask |= (1 << __DRI_API_OPENGL_CORE);
 142     if (psp->max_gl_es1_version > 0)
 143        psp->api_mask |= (1 << __DRI_API_GLES);
 144     if (psp->max_gl_es2_version > 0)
 145        psp->api_mask |= (1 << __DRI_API_GLES2);
 146     if (psp->max_gl_es2_version >= 30)
 147        psp->api_mask |= (1 << __DRI_API_GLES3);
 148
 149     driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions);
 150     driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum, "dri2");
 151
 152
 153     return psp;
 154 }
 155
 156 /** swrast driver createNewScreen entrypoint. */
 157 static __DRIscreen *
 158 driCreateNewScreen(int scrn, const __DRIextension **extensions,
 159                    const __DRIconfig ***driver_configs, void *data)
 160 {
 161    return dri2CreateNewScreen(scrn, -1, extensions, driver_configs, data);
 162 }
 163
 164 /**
 165  * Destroy the per-screen private information.
 166  *
 167  * \internal
 168  * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
 169  * drmClose(), and finally frees \p screenPrivate.
 170  */
 171 static void driDestroyScreen(__DRIscreen *psp)
 172 {
 173     if (psp) {
 174         /* No interaction with the X-server is possible at this point.  This
 175          * routine is called after XCloseDisplay, so there is no protocol
 176          * stream open to the X-server anymore.
 177          */
 178
 179        _mesa_destroy_shader_compiler();
 180
 181         psp->driver->DestroyScreen(psp);
 182
 183         driDestroyOptionCache(&psp->optionCache);
 184         driDestroyOptionInfo(&psp->optionInfo);
 185
 186         free(psp);
 187     }
 188 }
 189
 190 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 191 {
 192     return psp->extensions;
 193 }
 194
 195 /*@}*/
 196
 197
 198 static bool
 199 validate_context_version(__DRIscreen *screen,
 200                          int mesa_api,
 201                          unsigned major_version,
 202                          unsigned minor_version,
 203                          unsigned *dri_ctx_error)
 204 {
 205    unsigned req_version = 10 * major_version + minor_version;
 206    unsigned max_version = 0;
 207
 208    switch (mesa_api) {
 209    case API_OPENGL_COMPAT:
 210       max_version = screen->max_gl_compat_version;
 211       break;
 212    case API_OPENGL_CORE:
 213       max_version = screen->max_gl_core_version;
 214       break;
 215    case API_OPENGLES:
 216       max_version = screen->max_gl_es1_version;
 217       break;
 218    case API_OPENGLES2:
 219       max_version = screen->max_gl_es2_version;
 220       break;
 221    default:
 222       max_version = 0;
 223       break;
 224    }
 225
 226    if (max_version == 0) {
 227       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
 228       return false;
 229    } else if (req_version > max_version) {
 230       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
 231       return false;
 232    }
 233
 234    return true;
 235 }
 236
 237 /*****************************************************************/
 238 /** \name Context handling functions                             */
 239 /*****************************************************************/
 240 /*@{*/
 241
 242 static __DRIcontext *
 243 dri2CreateContextAttribs(__DRIscreen *screen, int api,
 244                          const __DRIconfig *config,
 245                          __DRIcontext *shared,
 246                          unsigned num_attribs,
 247                          const uint32_t *attribs,
 248                          unsigned *error,
 249                          void *data)
 250 {
 251     __DRIcontext *context;
 252     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
 253     void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 254     gl_api mesa_api;
 255     unsigned major_version = 1;
 256     unsigned minor_version = 0;
 257     uint32_t flags = 0;
 258
 259     assert((num_attribs == 0) || (attribs != NULL));
 260
 261     if (!(screen->api_mask & (1 << api))) {
 262         *error = __DRI_CTX_ERROR_BAD_API;
 263         return NULL;
 264     }
 265
 266     switch (api) {
 267     case __DRI_API_OPENGL:
 268         mesa_api = API_OPENGL_COMPAT;
 269         break;
 270     case __DRI_API_GLES:
 271         mesa_api = API_OPENGLES;
 272         break;
 273     case __DRI_API_GLES2:
 274     case __DRI_API_GLES3:
 275         mesa_api = API_OPENGLES2;
 276         break;
 277     case __DRI_API_OPENGL_CORE:
 278         mesa_api = API_OPENGL_CORE;
 279         break;
 280     default:
 281         *error = __DRI_CTX_ERROR_BAD_API;
 282         return NULL;
 283     }
 284
 285     for (unsigned i = 0; i < num_attribs; i++) {
 286         switch (attribs[i * 2]) {
 287         case __DRI_CTX_ATTRIB_MAJOR_VERSION:
 288             major_version = attribs[i * 2 + 1];
 289             break;
 290         case __DRI_CTX_ATTRIB_MINOR_VERSION:
 291             minor_version = attribs[i * 2 + 1];
 292             break;
 293         case __DRI_CTX_ATTRIB_FLAGS:
 294             flags = attribs[i * 2 + 1];
 295             break;
 296         default:
 297             /* We can't create a context that satisfies the requirements of an
 298              * attribute that we don't understand.  Return failure.
 299              */
 300             assert(!"Should not get here.");
 301             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 302             return NULL;
 303         }
 304     }
 305
 306     /* Mesa does not support the GL_ARB_compatibilty extension or the
 307      * compatibility profile.  This means that we treat a API_OPENGL_COMPAT 3.1 as
 308      * API_OPENGL_CORE and reject API_OPENGL_COMPAT 3.2+.
 309      */
 310     if (mesa_api == API_OPENGL_COMPAT && major_version == 3 && minor_version == 1)
 311        mesa_api = API_OPENGL_CORE;
 312
 313     if (mesa_api == API_OPENGL_COMPAT
 314         && ((major_version > 3)
 315             || (major_version == 3 && minor_version >= 2))) {
 316        *error = __DRI_CTX_ERROR_BAD_API;
 317        return NULL;
 318     }
 319
 320     /* The EGL_KHR_create_context spec says:
 321      *
 322      *     "Flags are only defined for OpenGL context creation, and specifying
 323      *     a flags value other than zero for other types of contexts,
 324      *     including OpenGL ES contexts, will generate an error."
 325      *
 326      * The GLX_EXT_create_context_es2_profile specification doesn't say
 327      * anything specific about this case.  However, none of the known flags
 328      * have any meaning in an ES context, so this seems safe.
 329      */
 330     if (mesa_api != API_OPENGL_COMPAT
 331         && mesa_api != API_OPENGL_CORE
 332         && flags != 0) {
 333         *error = __DRI_CTX_ERROR_BAD_FLAG;
 334         return NULL;
 335     }
 336
 337     /* There are no forward-compatible contexts before OpenGL 3.0.  The
 338      * GLX_ARB_create_context spec says:
 339      *
 340      *     "Forward-compatible contexts are defined only for OpenGL versions
 341      *     3.0 and later."
 342      *
 343      * Forward-looking contexts are supported by silently converting the
 344      * requested API to API_OPENGL_CORE.
 345      *
 346      * In Mesa, a debug context is the same as a regular context.
 347      */
 348     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
 349        mesa_api = API_OPENGL_CORE;
 350     }
 351
 352     if ((flags & ~(__DRI_CTX_FLAG_DEBUG | __DRI_CTX_FLAG_FORWARD_COMPATIBLE))
 353         != 0) {
 354         *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
 355         return NULL;
 356     }
 357
 358     if (!validate_context_version(screen, mesa_api,
 359                                   major_version, minor_version, error))
 360        return NULL;
 361
 362     context = calloc(1, sizeof *context);
 363     if (!context) {
 364         *error = __DRI_CTX_ERROR_NO_MEMORY;
 365         return NULL;
 366     }
 367
 368     context->loaderPrivate = data;
 369
 370     context->driScreenPriv = screen;
 371     context->driDrawablePriv = NULL;
 372     context->driReadablePriv = NULL;
 373
 374     if (!screen->driver->CreateContext(mesa_api, modes, context,
 375                                        major_version, minor_version,
 376                                        flags, error, shareCtx) ) {
 377         free(context);
 378         return NULL;
 379     }
 380
 381     *error = __DRI_CTX_ERROR_SUCCESS;
 382     return context;
 383 }
 384
 385 static __DRIcontext *
 386 dri2CreateNewContextForAPI(__DRIscreen *screen, int api,
 387                            const __DRIconfig *config,
 388                            __DRIcontext *shared, void *data)
 389 {
 390     unsigned error;
 391
 392     return dri2CreateContextAttribs(screen, api, config, shared, 0, NULL,
 393                                     &error, data);
 394 }
 395
 396 static __DRIcontext *
 397 dri2CreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 398                       __DRIcontext *shared, void *data)
 399 {
 400     return dri2CreateNewContextForAPI(screen, __DRI_API_OPENGL,
 401                                       config, shared, data);
 402 }
 403
 404 /**
 405  * Destroy the per-context private information.
 406  *
 407  * \internal
 408  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
 409  * drmDestroyContext(), and finally frees \p contextPrivate.
 410  */
 411 static void
 412 driDestroyContext(__DRIcontext *pcp)
 413 {
 414     if (pcp) {
 415         pcp->driScreenPriv->driver->DestroyContext(pcp);
 416         free(pcp);
 417     }
 418 }
 419
 420 static int
 421 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
 422 {
 423     (void) dest;
 424     (void) src;
 425     (void) mask;
 426     return GL_FALSE;
 427 }
 428
 429 /*@}*/
 430
 431
 432 /*****************************************************************/
 433 /** \name Context (un)binding functions                          */
 434 /*****************************************************************/
 435 /*@{*/
 436
 437 static void dri_get_drawable(__DRIdrawable *pdp);
 438 static void dri_put_drawable(__DRIdrawable *pdp);
 439
 440 /**
 441  * This function takes both a read buffer and a draw buffer.  This is needed
 442  * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
 443  * function.
 444  */
 445 static int driBindContext(__DRIcontext *pcp,
 446                           __DRIdrawable *pdp,
 447                           __DRIdrawable *prp)
 448 {
 449     /*
 450     ** Assume error checking is done properly in glXMakeCurrent before
 451     ** calling driUnbindContext.
 452     */
 453
 454     if (!pcp)
 455         return GL_FALSE;
 456
 457     /* Bind the drawable to the context */
 458     pcp->driDrawablePriv = pdp;
 459     pcp->driReadablePriv = prp;
 460     if (pdp) {
 461         pdp->driContextPriv = pcp;
 462         dri_get_drawable(pdp);
 463     }
 464     if (prp && pdp != prp) {
 465         dri_get_drawable(prp);
 466     }
 467
 468     return pcp->driScreenPriv->driver->MakeCurrent(pcp, pdp, prp);
 469 }
 470
 471 /**
 472  * Unbind context.
 473  *
 474  * \param scrn the screen.
 475  * \param gc context.
 476  *
 477  * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
 478  *
 479  * \internal
 480  * This function calls __DriverAPIRec::UnbindContext, and then decrements
 481  * __DRIdrawableRec::refcount which must be non-zero for a successful
 482  * return.
 483  *
 484  * While casting the opaque private pointers associated with the parameters
 485  * into their respective real types it also assures they are not \c NULL.
 486  */
 487 static int driUnbindContext(__DRIcontext *pcp)
 488 {
 489     __DRIdrawable *pdp;
 490     __DRIdrawable *prp;
 491
 492     /*
 493     ** Assume error checking is done properly in glXMakeCurrent before
 494     ** calling driUnbindContext.
 495     */
 496
 497     if (pcp == NULL)
 498         return GL_FALSE;
 499
 500     pdp = pcp->driDrawablePriv;
 501     prp = pcp->driReadablePriv;
 502
 503     /* already unbound */
 504     if (!pdp && !prp)
 505         return GL_TRUE;
 506
 507     pcp->driScreenPriv->driver->UnbindContext(pcp);
 508
 509     assert(pdp);
 510     if (pdp->refcount == 0) {
 511         /* ERROR!!! */
 512         return GL_FALSE;
 513     }
 514
 515     dri_put_drawable(pdp);
 516
 517     if (prp != pdp) {
 518         if (prp->refcount == 0) {
 519             /* ERROR!!! */
 520             return GL_FALSE;
 521         }
 522
 523         dri_put_drawable(prp);
 524     }
 525
 526     pcp->driDrawablePriv = NULL;
 527     pcp->driReadablePriv = NULL;
 528
 529     return GL_TRUE;
 530 }
 531
 532 /*@}*/
 533
 534
 535 static void dri_get_drawable(__DRIdrawable *pdp)
 536 {
 537     pdp->refcount++;
 538 }
 539
 540 static void dri_put_drawable(__DRIdrawable *pdp)
 541 {
 542     if (pdp) {
 543         pdp->refcount--;
 544         if (pdp->refcount)
 545             return;
 546
 547         pdp->driScreenPriv->driver->DestroyBuffer(pdp);
 548         free(pdp);
 549     }
 550 }
 551
 552 static __DRIdrawable *
 553 dri2CreateNewDrawable(__DRIscreen *screen,
 554                       const __DRIconfig *config,
 555                       void *data)
 556 {
 557     __DRIdrawable *pdraw;
 558
 559     pdraw = malloc(sizeof *pdraw);
 560     if (!pdraw)
 561         return NULL;
 562
 563     pdraw->loaderPrivate = data;
 564
 565     pdraw->driScreenPriv = screen;
 566     pdraw->driContextPriv = NULL;
 567     pdraw->refcount = 0;
 568     pdraw->lastStamp = 0;
 569     pdraw->w = 0;
 570     pdraw->h = 0;
 571
 572     dri_get_drawable(pdraw);
 573
 574     if (!screen->driver->CreateBuffer(screen, pdraw, &config->modes,
 575                                       GL_FALSE)) {
 576        free(pdraw);
 577        return NULL;
 578     }
 579
 580     pdraw->dri2.stamp = pdraw->lastStamp + 1;
 581
 582     return pdraw;
 583 }
 584
 585 static void
 586 driDestroyDrawable(__DRIdrawable *pdp)
 587 {
 588     dri_put_drawable(pdp);
 589 }
 590
 591 static __DRIbuffer *
 592 dri2AllocateBuffer(__DRIscreen *screen,
 593                    unsigned int attachment, unsigned int format,
 594                    int width, int height)
 595 {
 596     return screen->driver->AllocateBuffer(screen, attachment, format,
 597                                           width, height);
 598 }
 599
 600 static void
 601 dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 602 {
 603     screen->driver->ReleaseBuffer(screen, buffer);
 604 }
 605
 606
 607 static int
 608 dri2ConfigQueryb(__DRIscreen *screen, const char *var, GLboolean *val)
 609 {
 610    if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
 611       return -1;
 612
 613    *val = driQueryOptionb(&screen->optionCache, var);
 614
 615    return 0;
 616 }
 617
 618 static int
 619 dri2ConfigQueryi(__DRIscreen *screen, const char *var, GLint *val)
 620 {
 621    if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
 622        !driCheckOption(&screen->optionCache, var, DRI_ENUM))
 623       return -1;
 624
 625     *val = driQueryOptioni(&screen->optionCache, var);
 626
 627     return 0;
 628 }
 629
 630 static int
 631 dri2ConfigQueryf(__DRIscreen *screen, const char *var, GLfloat *val)
 632 {
 633    if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
 634       return -1;
 635
 636     *val = driQueryOptionf(&screen->optionCache, var);
 637
 638     return 0;
 639 }
 640
 641 static unsigned int
 642 dri2GetAPIMask(__DRIscreen *screen)
 643 {
 644     return screen->api_mask;
 645 }
 646
 647 /**
 648  * swrast swapbuffers entrypoint.
 649  *
 650  * DRI2 implements this inside the loader with only flushes handled by the
 651  * driver.
 652  */
 653 static void
 654 driSwapBuffers(__DRIdrawable *pdp)
 655 {
 656     assert(pdp->driScreenPriv->swrast_loader);
 657
 658     pdp->driScreenPriv->driver->SwapBuffers(pdp);
 659 }
 660
 661 /** Core interface */
 662 const __DRIcoreExtension driCoreExtension = {
 663     .base = { __DRI_CORE, __DRI_CORE_VERSION },
 664
 665     .createNewScreen            = NULL,
 666     .destroyScreen              = driDestroyScreen,
 667     .getExtensions              = driGetExtensions,
 668     .getConfigAttrib            = driGetConfigAttrib,
 669     .indexConfigAttrib          = driIndexConfigAttrib,
 670     .createNewDrawable          = NULL,
 671     .destroyDrawable            = driDestroyDrawable,
 672     .swapBuffers                = driSwapBuffers, /* swrast */
 673     .createNewContext           = dri2CreateNewContext, /* swrast */
 674     .copyContext                = driCopyContext,
 675     .destroyContext             = driDestroyContext,
 676     .bindContext                = driBindContext,
 677     .unbindContext              = driUnbindContext
 678 };
 679
 680 /** DRI2 interface */
 681 const __DRIdri2Extension driDRI2Extension = {
 682     .base = { __DRI_DRI2, 3 },
 683
 684     .createNewScreen            = dri2CreateNewScreen,
 685     .createNewDrawable          = dri2CreateNewDrawable,
 686     .createNewContext           = dri2CreateNewContext,
 687     .getAPIMask                 = dri2GetAPIMask,
 688     .createNewContextForAPI     = dri2CreateNewContextForAPI,
 689     .allocateBuffer             = dri2AllocateBuffer,
 690     .releaseBuffer              = dri2ReleaseBuffer,
 691     .createContextAttribs       = dri2CreateContextAttribs
 692 };
 693
 694 const __DRIswrastExtension driSWRastExtension = {
 695     { __DRI_SWRAST, __DRI_SWRAST_VERSION },
 696     driCreateNewScreen,
 697     dri2CreateNewDrawable,
 698     dri2CreateNewContextForAPI,
 699     dri2CreateContextAttribs
 700 };
 701
 702 const __DRI2configQueryExtension dri2ConfigQueryExtension = {
 703    .base = { __DRI2_CONFIG_QUERY, __DRI2_CONFIG_QUERY_VERSION },
 704
 705    .configQueryb        = dri2ConfigQueryb,
 706    .configQueryi        = dri2ConfigQueryi,
 707    .configQueryf        = dri2ConfigQueryf,
 708 };
 709
 710 void
 711 dri2InvalidateDrawable(__DRIdrawable *drawable)
 712 {
 713     drawable->dri2.stamp++;
 714 }
 715
 716 /**
 717  * Check that the gl_framebuffer associated with dPriv is the right size.
 718  * Resize the gl_framebuffer if needed.
 719  * It's expected that the dPriv->driverPrivate member points to a
 720  * gl_framebuffer object.
 721  */
 722 void
 723 driUpdateFramebufferSize(struct gl_context *ctx, const __DRIdrawable *dPriv)
 724 {
 725    struct gl_framebuffer *fb = (struct gl_framebuffer *) dPriv->driverPrivate;
 726    if (fb && (dPriv->w != fb->Width || dPriv->h != fb->Height)) {
 727       ctx->Driver.ResizeBuffers(ctx, fb, dPriv->w, dPriv->h);
 728       /* if the driver needs the hw lock for ResizeBuffers, the drawable
 729          might have changed again by now */
 730       assert(fb->Width == dPriv->w);
 731       assert(fb->Height == dPriv->h);
 732    }
 733 }