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/mtypes.h"
  51 #include "main/version.h"
  52 #include "main/macros.h"
  53
  54 PUBLIC const char __dri2ConfigOptions[] =
  55    DRI_CONF_BEGIN
  56       DRI_CONF_SECTION_PERFORMANCE
  57          DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_1)
  58       DRI_CONF_SECTION_END
  59    DRI_CONF_END;
  60
  61 /*****************************************************************/
  62 /** \name Screen handling functions                              */
  63 /*****************************************************************/
  64 /*@{*/
  65
  66 static void
  67 setupLoaderExtensions(__DRIscreen *psp,
  68                       const __DRIextension **extensions)
  69 {
  70     int i;
  71
  72     for (i = 0; extensions[i]; i++) {
  73         if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
  74             psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
  75         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)
  76             psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];
  77         if (strcmp(extensions[i]->name, __DRI_USE_INVALIDATE) == 0)
  78             psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];
  79         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
  80             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
  81     }
  82 }
  83
  84 /**
  85  * This is the first entrypoint in the driver called by the DRI driver loader
  86  * after dlopen()ing it.
  87  *
  88  * It's used to create global state for the driver across contexts on the same
  89  * Display.
  90  */
  91 static __DRIscreen *
  92 dri2CreateNewScreen2(int scrn, int fd,
  93                      const __DRIextension **extensions,
  94                      const __DRIextension **driver_extensions,
  95                      const __DRIconfig ***driver_configs, void *data)
  96 {
  97     static const __DRIextension *emptyExtensionList[] = { NULL };
  98     __DRIscreen *psp;
  99
 100     psp = calloc(1, sizeof(*psp));
 101     if (!psp)
 102         return NULL;
 103
 104     /* By default, use the global driDriverAPI symbol (non-megadrivers). */
 105     psp->driver = &driDriverAPI;
 106
 107     /* If the driver exposes its vtable through its extensions list
 108      * (megadrivers), use that instead.
 109      */
 110     if (driver_extensions) {
 111        for (int i = 0; driver_extensions[i]; i++) {
 112           if (strcmp(driver_extensions[i]->name, __DRI_DRIVER_VTABLE) == 0) {
 113              psp->driver =
 114                 ((__DRIDriverVtableExtension *)driver_extensions[i])->vtable;
 115           }
 116        }
 117     }
 118
 119     setupLoaderExtensions(psp, extensions);
 120
 121 #ifndef __NOT_HAVE_DRM_H
 122     if (fd != -1) {
 123        drmVersionPtr version = drmGetVersion(fd);
 124        if (version) {
 125           psp->drm_version.major = version->version_major;
 126           psp->drm_version.minor = version->version_minor;
 127           psp->drm_version.patch = version->version_patchlevel;
 128           drmFreeVersion(version);
 129        }
 130     }
 131 #endif
 132
 133     psp->loaderPrivate = data;
 134
 135     psp->extensions = emptyExtensionList;
 136     psp->fd = fd;
 137     psp->myNum = scrn;
 138
 139     *driver_configs = psp->driver->InitScreen(psp);
 140     if (*driver_configs == NULL) {
 141         free(psp);
 142         return NULL;
 143     }
 144
 145     int gl_version_override = _mesa_get_gl_version_override();
 146     if (gl_version_override >= 31) {
 147        psp->max_gl_core_version = MAX2(psp->max_gl_core_version,
 148                                        gl_version_override);
 149     } else {
 150        psp->max_gl_compat_version = MAX2(psp->max_gl_compat_version,
 151                                          gl_version_override);
 152     }
 153
 154     psp->api_mask = (1 << __DRI_API_OPENGL);
 155     if (psp->max_gl_core_version > 0)
 156        psp->api_mask |= (1 << __DRI_API_OPENGL_CORE);
 157     if (psp->max_gl_es1_version > 0)
 158        psp->api_mask |= (1 << __DRI_API_GLES);
 159     if (psp->max_gl_es2_version > 0)
 160        psp->api_mask |= (1 << __DRI_API_GLES2);
 161     if (psp->max_gl_es2_version >= 30)
 162        psp->api_mask |= (1 << __DRI_API_GLES3);
 163
 164     driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions);
 165     driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum, "dri2");
 166
 167
 168     return psp;
 169 }
 170
 171 static __DRIscreen *
 172 dri2CreateNewScreen(int scrn, int fd,
 173                     const __DRIextension **extensions,
 174                     const __DRIconfig ***driver_configs, void *data)
 175 {
 176    return dri2CreateNewScreen2(scrn, fd, extensions, NULL,
 177                                driver_configs, data);
 178 }
 179
 180 /** swrast driver createNewScreen entrypoint. */
 181 static __DRIscreen *
 182 driSWRastCreateNewScreen(int scrn, const __DRIextension **extensions,
 183                          const __DRIconfig ***driver_configs, void *data)
 184 {
 185    return dri2CreateNewScreen2(scrn, -1, extensions, NULL,
 186                                driver_configs, data);
 187 }
 188
 189 static __DRIscreen *
 190 driSWRastCreateNewScreen2(int scrn, const __DRIextension **extensions,
 191                           const __DRIextension **driver_extensions,
 192                           const __DRIconfig ***driver_configs, void *data)
 193 {
 194    return dri2CreateNewScreen2(scrn, -1, extensions, driver_extensions,
 195                                driver_configs, data);
 196 }
 197
 198 /**
 199  * Destroy the per-screen private information.
 200  *
 201  * \internal
 202  * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
 203  * drmClose(), and finally frees \p screenPrivate.
 204  */
 205 static void driDestroyScreen(__DRIscreen *psp)
 206 {
 207     if (psp) {
 208         /* No interaction with the X-server is possible at this point.  This
 209          * routine is called after XCloseDisplay, so there is no protocol
 210          * stream open to the X-server anymore.
 211          */
 212
 213        _mesa_destroy_shader_compiler();
 214
 215         psp->driver->DestroyScreen(psp);
 216
 217         driDestroyOptionCache(&psp->optionCache);
 218         driDestroyOptionInfo(&psp->optionInfo);
 219
 220         free(psp);
 221     }
 222 }
 223
 224 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 225 {
 226     return psp->extensions;
 227 }
 228
 229 /*@}*/
 230
 231
 232 static bool
 233 validate_context_version(__DRIscreen *screen,
 234                          int mesa_api,
 235                          unsigned major_version,
 236                          unsigned minor_version,
 237                          unsigned *dri_ctx_error)
 238 {
 239    unsigned req_version = 10 * major_version + minor_version;
 240    unsigned max_version = 0;
 241
 242    switch (mesa_api) {
 243    case API_OPENGL_COMPAT:
 244       max_version = screen->max_gl_compat_version;
 245       break;
 246    case API_OPENGL_CORE:
 247       max_version = screen->max_gl_core_version;
 248       break;
 249    case API_OPENGLES:
 250       max_version = screen->max_gl_es1_version;
 251       break;
 252    case API_OPENGLES2:
 253       max_version = screen->max_gl_es2_version;
 254       break;
 255    default:
 256       max_version = 0;
 257       break;
 258    }
 259
 260    if (max_version == 0) {
 261       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
 262       return false;
 263    } else if (req_version > max_version) {
 264       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
 265       return false;
 266    }
 267
 268    return true;
 269 }
 270
 271 /*****************************************************************/
 272 /** \name Context handling functions                             */
 273 /*****************************************************************/
 274 /*@{*/
 275
 276 static __DRIcontext *
 277 dri2CreateContextAttribs(__DRIscreen *screen, int api,
 278                          const __DRIconfig *config,
 279                          __DRIcontext *shared,
 280                          unsigned num_attribs,
 281                          const uint32_t *attribs,
 282                          unsigned *error,
 283                          void *data)
 284 {
 285     __DRIcontext *context;
 286     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
 287     void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 288     gl_api mesa_api;
 289     unsigned major_version = 1;
 290     unsigned minor_version = 0;
 291     uint32_t flags = 0;
 292
 293     assert((num_attribs == 0) || (attribs != NULL));
 294
 295     if (!(screen->api_mask & (1 << api))) {
 296         *error = __DRI_CTX_ERROR_BAD_API;
 297         return NULL;
 298     }
 299
 300     switch (api) {
 301     case __DRI_API_OPENGL:
 302         mesa_api = API_OPENGL_COMPAT;
 303         break;
 304     case __DRI_API_GLES:
 305         mesa_api = API_OPENGLES;
 306         break;
 307     case __DRI_API_GLES2:
 308     case __DRI_API_GLES3:
 309         mesa_api = API_OPENGLES2;
 310         break;
 311     case __DRI_API_OPENGL_CORE:
 312         mesa_api = API_OPENGL_CORE;
 313         break;
 314     default:
 315         *error = __DRI_CTX_ERROR_BAD_API;
 316         return NULL;
 317     }
 318
 319     for (unsigned i = 0; i < num_attribs; i++) {
 320         switch (attribs[i * 2]) {
 321         case __DRI_CTX_ATTRIB_MAJOR_VERSION:
 322             major_version = attribs[i * 2 + 1];
 323             break;
 324         case __DRI_CTX_ATTRIB_MINOR_VERSION:
 325             minor_version = attribs[i * 2 + 1];
 326             break;
 327         case __DRI_CTX_ATTRIB_FLAGS:
 328             flags = attribs[i * 2 + 1];
 329             break;
 330         default:
 331             /* We can't create a context that satisfies the requirements of an
 332              * attribute that we don't understand.  Return failure.
 333              */
 334             assert(!"Should not get here.");
 335             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 336             return NULL;
 337         }
 338     }
 339
 340     /* Mesa does not support the GL_ARB_compatibilty extension or the
 341      * compatibility profile.  This means that we treat a API_OPENGL_COMPAT 3.1 as
 342      * API_OPENGL_CORE and reject API_OPENGL_COMPAT 3.2+.
 343      */
 344     if (mesa_api == API_OPENGL_COMPAT && major_version == 3 && minor_version == 1)
 345        mesa_api = API_OPENGL_CORE;
 346
 347     if (mesa_api == API_OPENGL_COMPAT
 348         && ((major_version > 3)
 349             || (major_version == 3 && minor_version >= 2))) {
 350        *error = __DRI_CTX_ERROR_BAD_API;
 351        return NULL;
 352     }
 353
 354     /* The EGL_KHR_create_context spec says:
 355      *
 356      *     "Flags are only defined for OpenGL context creation, and specifying
 357      *     a flags value other than zero for other types of contexts,
 358      *     including OpenGL ES contexts, will generate an error."
 359      *
 360      * The GLX_EXT_create_context_es2_profile specification doesn't say
 361      * anything specific about this case.  However, none of the known flags
 362      * have any meaning in an ES context, so this seems safe.
 363      */
 364     if (mesa_api != API_OPENGL_COMPAT
 365         && mesa_api != API_OPENGL_CORE
 366         && flags != 0) {
 367         *error = __DRI_CTX_ERROR_BAD_FLAG;
 368         return NULL;
 369     }
 370
 371     /* There are no forward-compatible contexts before OpenGL 3.0.  The
 372      * GLX_ARB_create_context spec says:
 373      *
 374      *     "Forward-compatible contexts are defined only for OpenGL versions
 375      *     3.0 and later."
 376      *
 377      * Forward-looking contexts are supported by silently converting the
 378      * requested API to API_OPENGL_CORE.
 379      *
 380      * In Mesa, a debug context is the same as a regular context.
 381      */
 382     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
 383        mesa_api = API_OPENGL_CORE;
 384     }
 385
 386     if ((flags & ~(__DRI_CTX_FLAG_DEBUG | __DRI_CTX_FLAG_FORWARD_COMPATIBLE))
 387         != 0) {
 388         *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
 389         return NULL;
 390     }
 391
 392     if (!validate_context_version(screen, mesa_api,
 393                                   major_version, minor_version, error))
 394        return NULL;
 395
 396     context = calloc(1, sizeof *context);
 397     if (!context) {
 398         *error = __DRI_CTX_ERROR_NO_MEMORY;
 399         return NULL;
 400     }
 401
 402     context->loaderPrivate = data;
 403
 404     context->driScreenPriv = screen;
 405     context->driDrawablePriv = NULL;
 406     context->driReadablePriv = NULL;
 407
 408     if (!screen->driver->CreateContext(mesa_api, modes, context,
 409                                        major_version, minor_version,
 410                                        flags, error, shareCtx) ) {
 411         free(context);
 412         return NULL;
 413     }
 414
 415     struct gl_context *ctx = context->driverPrivate;
 416     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0)
 417         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 418     if ((flags & __DRI_CTX_FLAG_DEBUG) != 0) {
 419         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 420         ctx->Debug.DebugOutput = GL_TRUE;
 421     }
 422
 423     *error = __DRI_CTX_ERROR_SUCCESS;
 424     return context;
 425 }
 426
 427 static __DRIcontext *
 428 dri2CreateNewContextForAPI(__DRIscreen *screen, int api,
 429                            const __DRIconfig *config,
 430                            __DRIcontext *shared, void *data)
 431 {
 432     unsigned error;
 433
 434     return dri2CreateContextAttribs(screen, api, config, shared, 0, NULL,
 435                                     &error, data);
 436 }
 437
 438 static __DRIcontext *
 439 dri2CreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 440                       __DRIcontext *shared, void *data)
 441 {
 442     return dri2CreateNewContextForAPI(screen, __DRI_API_OPENGL,
 443                                       config, shared, data);
 444 }
 445
 446 /**
 447  * Destroy the per-context private information.
 448  *
 449  * \internal
 450  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
 451  * drmDestroyContext(), and finally frees \p contextPrivate.
 452  */
 453 static void
 454 driDestroyContext(__DRIcontext *pcp)
 455 {
 456     if (pcp) {
 457         pcp->driScreenPriv->driver->DestroyContext(pcp);
 458         free(pcp);
 459     }
 460 }
 461
 462 static int
 463 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
 464 {
 465     (void) dest;
 466     (void) src;
 467     (void) mask;
 468     return GL_FALSE;
 469 }
 470
 471 /*@}*/
 472
 473
 474 /*****************************************************************/
 475 /** \name Context (un)binding functions                          */
 476 /*****************************************************************/
 477 /*@{*/
 478
 479 static void dri_get_drawable(__DRIdrawable *pdp);
 480 static void dri_put_drawable(__DRIdrawable *pdp);
 481
 482 /**
 483  * This function takes both a read buffer and a draw buffer.  This is needed
 484  * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
 485  * function.
 486  */
 487 static int driBindContext(__DRIcontext *pcp,
 488                           __DRIdrawable *pdp,
 489                           __DRIdrawable *prp)
 490 {
 491     /*
 492     ** Assume error checking is done properly in glXMakeCurrent before
 493     ** calling driUnbindContext.
 494     */
 495
 496     if (!pcp)
 497         return GL_FALSE;
 498
 499     /* Bind the drawable to the context */
 500     pcp->driDrawablePriv = pdp;
 501     pcp->driReadablePriv = prp;
 502     if (pdp) {
 503         pdp->driContextPriv = pcp;
 504         dri_get_drawable(pdp);
 505     }
 506     if (prp && pdp != prp) {
 507         dri_get_drawable(prp);
 508     }
 509
 510     return pcp->driScreenPriv->driver->MakeCurrent(pcp, pdp, prp);
 511 }
 512
 513 /**
 514  * Unbind context.
 515  *
 516  * \param scrn the screen.
 517  * \param gc context.
 518  *
 519  * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
 520  *
 521  * \internal
 522  * This function calls __DriverAPIRec::UnbindContext, and then decrements
 523  * __DRIdrawableRec::refcount which must be non-zero for a successful
 524  * return.
 525  *
 526  * While casting the opaque private pointers associated with the parameters
 527  * into their respective real types it also assures they are not \c NULL.
 528  */
 529 static int driUnbindContext(__DRIcontext *pcp)
 530 {
 531     __DRIdrawable *pdp;
 532     __DRIdrawable *prp;
 533
 534     /*
 535     ** Assume error checking is done properly in glXMakeCurrent before
 536     ** calling driUnbindContext.
 537     */
 538
 539     if (pcp == NULL)
 540         return GL_FALSE;
 541
 542     pdp = pcp->driDrawablePriv;
 543     prp = pcp->driReadablePriv;
 544
 545     /* already unbound */
 546     if (!pdp && !prp)
 547         return GL_TRUE;
 548
 549     pcp->driScreenPriv->driver->UnbindContext(pcp);
 550
 551     assert(pdp);
 552     if (pdp->refcount == 0) {
 553         /* ERROR!!! */
 554         return GL_FALSE;
 555     }
 556
 557     dri_put_drawable(pdp);
 558
 559     if (prp != pdp) {
 560         if (prp->refcount == 0) {
 561             /* ERROR!!! */
 562             return GL_FALSE;
 563         }
 564
 565         dri_put_drawable(prp);
 566     }
 567
 568     pcp->driDrawablePriv = NULL;
 569     pcp->driReadablePriv = NULL;
 570
 571     return GL_TRUE;
 572 }
 573
 574 /*@}*/
 575
 576
 577 static void dri_get_drawable(__DRIdrawable *pdp)
 578 {
 579     pdp->refcount++;
 580 }
 581
 582 static void dri_put_drawable(__DRIdrawable *pdp)
 583 {
 584     if (pdp) {
 585         pdp->refcount--;
 586         if (pdp->refcount)
 587             return;
 588
 589         pdp->driScreenPriv->driver->DestroyBuffer(pdp);
 590         free(pdp);
 591     }
 592 }
 593
 594 static __DRIdrawable *
 595 dri2CreateNewDrawable(__DRIscreen *screen,
 596                       const __DRIconfig *config,
 597                       void *data)
 598 {
 599     __DRIdrawable *pdraw;
 600
 601     pdraw = malloc(sizeof *pdraw);
 602     if (!pdraw)
 603         return NULL;
 604
 605     pdraw->loaderPrivate = data;
 606
 607     pdraw->driScreenPriv = screen;
 608     pdraw->driContextPriv = NULL;
 609     pdraw->refcount = 0;
 610     pdraw->lastStamp = 0;
 611     pdraw->w = 0;
 612     pdraw->h = 0;
 613
 614     dri_get_drawable(pdraw);
 615
 616     if (!screen->driver->CreateBuffer(screen, pdraw, &config->modes,
 617                                       GL_FALSE)) {
 618        free(pdraw);
 619        return NULL;
 620     }
 621
 622     pdraw->dri2.stamp = pdraw->lastStamp + 1;
 623
 624     return pdraw;
 625 }
 626
 627 static void
 628 driDestroyDrawable(__DRIdrawable *pdp)
 629 {
 630     dri_put_drawable(pdp);
 631 }
 632
 633 static __DRIbuffer *
 634 dri2AllocateBuffer(__DRIscreen *screen,
 635                    unsigned int attachment, unsigned int format,
 636                    int width, int height)
 637 {
 638     return screen->driver->AllocateBuffer(screen, attachment, format,
 639                                           width, height);
 640 }
 641
 642 static void
 643 dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 644 {
 645     screen->driver->ReleaseBuffer(screen, buffer);
 646 }
 647
 648
 649 static int
 650 dri2ConfigQueryb(__DRIscreen *screen, const char *var, GLboolean *val)
 651 {
 652    if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
 653       return -1;
 654
 655    *val = driQueryOptionb(&screen->optionCache, var);
 656
 657    return 0;
 658 }
 659
 660 static int
 661 dri2ConfigQueryi(__DRIscreen *screen, const char *var, GLint *val)
 662 {
 663    if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
 664        !driCheckOption(&screen->optionCache, var, DRI_ENUM))
 665       return -1;
 666
 667     *val = driQueryOptioni(&screen->optionCache, var);
 668
 669     return 0;
 670 }
 671
 672 static int
 673 dri2ConfigQueryf(__DRIscreen *screen, const char *var, GLfloat *val)
 674 {
 675    if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
 676       return -1;
 677
 678     *val = driQueryOptionf(&screen->optionCache, var);
 679
 680     return 0;
 681 }
 682
 683 static unsigned int
 684 dri2GetAPIMask(__DRIscreen *screen)
 685 {
 686     return screen->api_mask;
 687 }
 688
 689 /**
 690  * swrast swapbuffers entrypoint.
 691  *
 692  * DRI2 implements this inside the loader with only flushes handled by the
 693  * driver.
 694  */
 695 static void
 696 driSwapBuffers(__DRIdrawable *pdp)
 697 {
 698     assert(pdp->driScreenPriv->swrast_loader);
 699
 700     pdp->driScreenPriv->driver->SwapBuffers(pdp);
 701 }
 702
 703 /** Core interface */
 704 const __DRIcoreExtension driCoreExtension = {
 705     .base = { __DRI_CORE, __DRI_CORE_VERSION },
 706
 707     .createNewScreen            = NULL,
 708     .destroyScreen              = driDestroyScreen,
 709     .getExtensions              = driGetExtensions,
 710     .getConfigAttrib            = driGetConfigAttrib,
 711     .indexConfigAttrib          = driIndexConfigAttrib,
 712     .createNewDrawable          = NULL,
 713     .destroyDrawable            = driDestroyDrawable,
 714     .swapBuffers                = driSwapBuffers, /* swrast */
 715     .createNewContext           = dri2CreateNewContext, /* swrast */
 716     .copyContext                = driCopyContext,
 717     .destroyContext             = driDestroyContext,
 718     .bindContext                = driBindContext,
 719     .unbindContext              = driUnbindContext
 720 };
 721
 722 /** DRI2 interface */
 723 const __DRIdri2Extension driDRI2Extension = {
 724     .base = { __DRI_DRI2, 4 },
 725
 726     .createNewScreen            = dri2CreateNewScreen,
 727     .createNewDrawable          = dri2CreateNewDrawable,
 728     .createNewContext           = dri2CreateNewContext,
 729     .getAPIMask                 = dri2GetAPIMask,
 730     .createNewContextForAPI     = dri2CreateNewContextForAPI,
 731     .allocateBuffer             = dri2AllocateBuffer,
 732     .releaseBuffer              = dri2ReleaseBuffer,
 733     .createContextAttribs       = dri2CreateContextAttribs,
 734     .createNewScreen2           = dri2CreateNewScreen2,
 735 };
 736
 737 const __DRIswrastExtension driSWRastExtension = {
 738     { __DRI_SWRAST, 4 },
 739     driSWRastCreateNewScreen,
 740     dri2CreateNewDrawable,
 741     dri2CreateNewContextForAPI,
 742     dri2CreateContextAttribs,
 743     driSWRastCreateNewScreen2,
 744 };
 745
 746 const __DRI2configQueryExtension dri2ConfigQueryExtension = {
 747    .base = { __DRI2_CONFIG_QUERY, __DRI2_CONFIG_QUERY_VERSION },
 748
 749    .configQueryb        = dri2ConfigQueryb,
 750    .configQueryi        = dri2ConfigQueryi,
 751    .configQueryf        = dri2ConfigQueryf,
 752 };
 753
 754 void
 755 dri2InvalidateDrawable(__DRIdrawable *drawable)
 756 {
 757     drawable->dri2.stamp++;
 758 }
 759
 760 /**
 761  * Check that the gl_framebuffer associated with dPriv is the right size.
 762  * Resize the gl_framebuffer if needed.
 763  * It's expected that the dPriv->driverPrivate member points to a
 764  * gl_framebuffer object.
 765  */
 766 void
 767 driUpdateFramebufferSize(struct gl_context *ctx, const __DRIdrawable *dPriv)
 768 {
 769    struct gl_framebuffer *fb = (struct gl_framebuffer *) dPriv->driverPrivate;
 770    if (fb && (dPriv->w != fb->Width || dPriv->h != fb->Height)) {
 771       ctx->Driver.ResizeBuffers(ctx, fb, dPriv->w, dPriv->h);
 772       /* if the driver needs the hw lock for ResizeBuffers, the drawable
 773          might have changed again by now */
 774       assert(fb->Width == dPriv->w);
 775       assert(fb->Height == dPriv->h);
 776    }
 777 }