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 pointer determines which driver API we'll use in the case of the
  86  * loader not passing us an explicit driver extensions list (that would,
  87  * itself, contain a pointer to a driver API.)
  88  *
  89  * A driver's driDriverGetExtensions_drivername() can update this pointer to
  90  * what it's returning, and a loader that is ignorant of createNewScreen2()
  91  * will get the correct driver screen created, as long as no other
  92  * driDriverGetExtensions() happened in between the first one and the
  93  * createNewScreen().
  94  *
  95  * This allows the X Server to not require the significant dri_interface.h
  96  * updates for doing createNewScreen2(), which would discourage backporting of
  97  * the X Server patches to support the new loader interface.
  98  */
  99 const struct __DriverAPIRec *globalDriverAPI = &driDriverAPI;
 100
 101 /**
 102  * This is the first entrypoint in the driver called by the DRI driver loader
 103  * after dlopen()ing it.
 104  *
 105  * It's used to create global state for the driver across contexts on the same
 106  * Display.
 107  */
 108 static __DRIscreen *
 109 dri2CreateNewScreen2(int scrn, int fd,
 110                      const __DRIextension **extensions,
 111                      const __DRIextension **driver_extensions,
 112                      const __DRIconfig ***driver_configs, void *data)
 113 {
 114     static const __DRIextension *emptyExtensionList[] = { NULL };
 115     __DRIscreen *psp;
 116
 117     psp = calloc(1, sizeof(*psp));
 118     if (!psp)
 119         return NULL;
 120
 121     /* By default, use the global driDriverAPI symbol (non-megadrivers). */
 122     psp->driver = globalDriverAPI;
 123
 124     /* If the driver exposes its vtable through its extensions list
 125      * (megadrivers), use that instead.
 126      */
 127     if (driver_extensions) {
 128        for (int i = 0; driver_extensions[i]; i++) {
 129           if (strcmp(driver_extensions[i]->name, __DRI_DRIVER_VTABLE) == 0) {
 130              psp->driver =
 131                 ((__DRIDriverVtableExtension *)driver_extensions[i])->vtable;
 132           }
 133        }
 134     }
 135
 136     setupLoaderExtensions(psp, extensions);
 137
 138 #ifndef __NOT_HAVE_DRM_H
 139     if (fd != -1) {
 140        drmVersionPtr version = drmGetVersion(fd);
 141        if (version) {
 142           psp->drm_version.major = version->version_major;
 143           psp->drm_version.minor = version->version_minor;
 144           psp->drm_version.patch = version->version_patchlevel;
 145           drmFreeVersion(version);
 146        }
 147     }
 148 #endif
 149
 150     psp->loaderPrivate = data;
 151
 152     psp->extensions = emptyExtensionList;
 153     psp->fd = fd;
 154     psp->myNum = scrn;
 155
 156     *driver_configs = psp->driver->InitScreen(psp);
 157     if (*driver_configs == NULL) {
 158         free(psp);
 159         return NULL;
 160     }
 161
 162     int gl_version_override = _mesa_get_gl_version_override();
 163     if (gl_version_override >= 31) {
 164        psp->max_gl_core_version = MAX2(psp->max_gl_core_version,
 165                                        gl_version_override);
 166     } else {
 167        psp->max_gl_compat_version = MAX2(psp->max_gl_compat_version,
 168                                          gl_version_override);
 169     }
 170
 171     psp->api_mask = (1 << __DRI_API_OPENGL);
 172     if (psp->max_gl_core_version > 0)
 173        psp->api_mask |= (1 << __DRI_API_OPENGL_CORE);
 174     if (psp->max_gl_es1_version > 0)
 175        psp->api_mask |= (1 << __DRI_API_GLES);
 176     if (psp->max_gl_es2_version > 0)
 177        psp->api_mask |= (1 << __DRI_API_GLES2);
 178     if (psp->max_gl_es2_version >= 30)
 179        psp->api_mask |= (1 << __DRI_API_GLES3);
 180
 181     driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions);
 182     driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum, "dri2");
 183
 184
 185     return psp;
 186 }
 187
 188 static __DRIscreen *
 189 dri2CreateNewScreen(int scrn, int fd,
 190                     const __DRIextension **extensions,
 191                     const __DRIconfig ***driver_configs, void *data)
 192 {
 193    return dri2CreateNewScreen2(scrn, fd, extensions, NULL,
 194                                driver_configs, data);
 195 }
 196
 197 /** swrast driver createNewScreen entrypoint. */
 198 static __DRIscreen *
 199 driSWRastCreateNewScreen(int scrn, const __DRIextension **extensions,
 200                          const __DRIconfig ***driver_configs, void *data)
 201 {
 202    return dri2CreateNewScreen2(scrn, -1, extensions, NULL,
 203                                driver_configs, data);
 204 }
 205
 206 static __DRIscreen *
 207 driSWRastCreateNewScreen2(int scrn, const __DRIextension **extensions,
 208                           const __DRIextension **driver_extensions,
 209                           const __DRIconfig ***driver_configs, void *data)
 210 {
 211    return dri2CreateNewScreen2(scrn, -1, extensions, driver_extensions,
 212                                driver_configs, data);
 213 }
 214
 215 /**
 216  * Destroy the per-screen private information.
 217  *
 218  * \internal
 219  * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
 220  * drmClose(), and finally frees \p screenPrivate.
 221  */
 222 static void driDestroyScreen(__DRIscreen *psp)
 223 {
 224     if (psp) {
 225         /* No interaction with the X-server is possible at this point.  This
 226          * routine is called after XCloseDisplay, so there is no protocol
 227          * stream open to the X-server anymore.
 228          */
 229
 230        _mesa_destroy_shader_compiler();
 231
 232         psp->driver->DestroyScreen(psp);
 233
 234         driDestroyOptionCache(&psp->optionCache);
 235         driDestroyOptionInfo(&psp->optionInfo);
 236
 237         free(psp);
 238     }
 239 }
 240
 241 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 242 {
 243     return psp->extensions;
 244 }
 245
 246 /*@}*/
 247
 248
 249 static bool
 250 validate_context_version(__DRIscreen *screen,
 251                          int mesa_api,
 252                          unsigned major_version,
 253                          unsigned minor_version,
 254                          unsigned *dri_ctx_error)
 255 {
 256    unsigned req_version = 10 * major_version + minor_version;
 257    unsigned max_version = 0;
 258
 259    switch (mesa_api) {
 260    case API_OPENGL_COMPAT:
 261       max_version = screen->max_gl_compat_version;
 262       break;
 263    case API_OPENGL_CORE:
 264       max_version = screen->max_gl_core_version;
 265       break;
 266    case API_OPENGLES:
 267       max_version = screen->max_gl_es1_version;
 268       break;
 269    case API_OPENGLES2:
 270       max_version = screen->max_gl_es2_version;
 271       break;
 272    default:
 273       max_version = 0;
 274       break;
 275    }
 276
 277    if (max_version == 0) {
 278       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
 279       return false;
 280    } else if (req_version > max_version) {
 281       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
 282       return false;
 283    }
 284
 285    return true;
 286 }
 287
 288 /*****************************************************************/
 289 /** \name Context handling functions                             */
 290 /*****************************************************************/
 291 /*@{*/
 292
 293 static __DRIcontext *
 294 dri2CreateContextAttribs(__DRIscreen *screen, int api,
 295                          const __DRIconfig *config,
 296                          __DRIcontext *shared,
 297                          unsigned num_attribs,
 298                          const uint32_t *attribs,
 299                          unsigned *error,
 300                          void *data)
 301 {
 302     __DRIcontext *context;
 303     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
 304     void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 305     gl_api mesa_api;
 306     unsigned major_version = 1;
 307     unsigned minor_version = 0;
 308     uint32_t flags = 0;
 309
 310     assert((num_attribs == 0) || (attribs != NULL));
 311
 312     if (!(screen->api_mask & (1 << api))) {
 313         *error = __DRI_CTX_ERROR_BAD_API;
 314         return NULL;
 315     }
 316
 317     switch (api) {
 318     case __DRI_API_OPENGL:
 319         mesa_api = API_OPENGL_COMPAT;
 320         break;
 321     case __DRI_API_GLES:
 322         mesa_api = API_OPENGLES;
 323         break;
 324     case __DRI_API_GLES2:
 325     case __DRI_API_GLES3:
 326         mesa_api = API_OPENGLES2;
 327         break;
 328     case __DRI_API_OPENGL_CORE:
 329         mesa_api = API_OPENGL_CORE;
 330         break;
 331     default:
 332         *error = __DRI_CTX_ERROR_BAD_API;
 333         return NULL;
 334     }
 335
 336     for (unsigned i = 0; i < num_attribs; i++) {
 337         switch (attribs[i * 2]) {
 338         case __DRI_CTX_ATTRIB_MAJOR_VERSION:
 339             major_version = attribs[i * 2 + 1];
 340             break;
 341         case __DRI_CTX_ATTRIB_MINOR_VERSION:
 342             minor_version = attribs[i * 2 + 1];
 343             break;
 344         case __DRI_CTX_ATTRIB_FLAGS:
 345             flags = attribs[i * 2 + 1];
 346             break;
 347         default:
 348             /* We can't create a context that satisfies the requirements of an
 349              * attribute that we don't understand.  Return failure.
 350              */
 351             assert(!"Should not get here.");
 352             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 353             return NULL;
 354         }
 355     }
 356
 357     /* Mesa does not support the GL_ARB_compatibilty extension or the
 358      * compatibility profile.  This means that we treat a API_OPENGL_COMPAT 3.1 as
 359      * API_OPENGL_CORE and reject API_OPENGL_COMPAT 3.2+.
 360      */
 361     if (mesa_api == API_OPENGL_COMPAT && major_version == 3 && minor_version == 1)
 362        mesa_api = API_OPENGL_CORE;
 363
 364     if (mesa_api == API_OPENGL_COMPAT
 365         && ((major_version > 3)
 366             || (major_version == 3 && minor_version >= 2))) {
 367        *error = __DRI_CTX_ERROR_BAD_API;
 368        return NULL;
 369     }
 370
 371     /* The EGL_KHR_create_context spec says:
 372      *
 373      *     "Flags are only defined for OpenGL context creation, and specifying
 374      *     a flags value other than zero for other types of contexts,
 375      *     including OpenGL ES contexts, will generate an error."
 376      *
 377      * The GLX_EXT_create_context_es2_profile specification doesn't say
 378      * anything specific about this case.  However, none of the known flags
 379      * have any meaning in an ES context, so this seems safe.
 380      */
 381     if (mesa_api != API_OPENGL_COMPAT
 382         && mesa_api != API_OPENGL_CORE
 383         && flags != 0) {
 384         *error = __DRI_CTX_ERROR_BAD_FLAG;
 385         return NULL;
 386     }
 387
 388     /* There are no forward-compatible contexts before OpenGL 3.0.  The
 389      * GLX_ARB_create_context spec says:
 390      *
 391      *     "Forward-compatible contexts are defined only for OpenGL versions
 392      *     3.0 and later."
 393      *
 394      * Forward-looking contexts are supported by silently converting the
 395      * requested API to API_OPENGL_CORE.
 396      *
 397      * In Mesa, a debug context is the same as a regular context.
 398      */
 399     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
 400        mesa_api = API_OPENGL_CORE;
 401     }
 402
 403     if ((flags & ~(__DRI_CTX_FLAG_DEBUG | __DRI_CTX_FLAG_FORWARD_COMPATIBLE))
 404         != 0) {
 405         *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
 406         return NULL;
 407     }
 408
 409     if (!validate_context_version(screen, mesa_api,
 410                                   major_version, minor_version, error))
 411        return NULL;
 412
 413     context = calloc(1, sizeof *context);
 414     if (!context) {
 415         *error = __DRI_CTX_ERROR_NO_MEMORY;
 416         return NULL;
 417     }
 418
 419     context->loaderPrivate = data;
 420
 421     context->driScreenPriv = screen;
 422     context->driDrawablePriv = NULL;
 423     context->driReadablePriv = NULL;
 424
 425     if (!screen->driver->CreateContext(mesa_api, modes, context,
 426                                        major_version, minor_version,
 427                                        flags, error, shareCtx) ) {
 428         free(context);
 429         return NULL;
 430     }
 431
 432     struct gl_context *ctx = context->driverPrivate;
 433     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0)
 434         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 435     if ((flags & __DRI_CTX_FLAG_DEBUG) != 0) {
 436         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 437         ctx->Debug.DebugOutput = GL_TRUE;
 438     }
 439
 440     *error = __DRI_CTX_ERROR_SUCCESS;
 441     return context;
 442 }
 443
 444 static __DRIcontext *
 445 dri2CreateNewContextForAPI(__DRIscreen *screen, int api,
 446                            const __DRIconfig *config,
 447                            __DRIcontext *shared, void *data)
 448 {
 449     unsigned error;
 450
 451     return dri2CreateContextAttribs(screen, api, config, shared, 0, NULL,
 452                                     &error, data);
 453 }
 454
 455 static __DRIcontext *
 456 dri2CreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 457                       __DRIcontext *shared, void *data)
 458 {
 459     return dri2CreateNewContextForAPI(screen, __DRI_API_OPENGL,
 460                                       config, shared, data);
 461 }
 462
 463 /**
 464  * Destroy the per-context private information.
 465  *
 466  * \internal
 467  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
 468  * drmDestroyContext(), and finally frees \p contextPrivate.
 469  */
 470 static void
 471 driDestroyContext(__DRIcontext *pcp)
 472 {
 473     if (pcp) {
 474         pcp->driScreenPriv->driver->DestroyContext(pcp);
 475         free(pcp);
 476     }
 477 }
 478
 479 static int
 480 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
 481 {
 482     (void) dest;
 483     (void) src;
 484     (void) mask;
 485     return GL_FALSE;
 486 }
 487
 488 /*@}*/
 489
 490
 491 /*****************************************************************/
 492 /** \name Context (un)binding functions                          */
 493 /*****************************************************************/
 494 /*@{*/
 495
 496 static void dri_get_drawable(__DRIdrawable *pdp);
 497 static void dri_put_drawable(__DRIdrawable *pdp);
 498
 499 /**
 500  * This function takes both a read buffer and a draw buffer.  This is needed
 501  * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
 502  * function.
 503  */
 504 static int driBindContext(__DRIcontext *pcp,
 505                           __DRIdrawable *pdp,
 506                           __DRIdrawable *prp)
 507 {
 508     /*
 509     ** Assume error checking is done properly in glXMakeCurrent before
 510     ** calling driUnbindContext.
 511     */
 512
 513     if (!pcp)
 514         return GL_FALSE;
 515
 516     /* Bind the drawable to the context */
 517     pcp->driDrawablePriv = pdp;
 518     pcp->driReadablePriv = prp;
 519     if (pdp) {
 520         pdp->driContextPriv = pcp;
 521         dri_get_drawable(pdp);
 522     }
 523     if (prp && pdp != prp) {
 524         dri_get_drawable(prp);
 525     }
 526
 527     return pcp->driScreenPriv->driver->MakeCurrent(pcp, pdp, prp);
 528 }
 529
 530 /**
 531  * Unbind context.
 532  *
 533  * \param scrn the screen.
 534  * \param gc context.
 535  *
 536  * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
 537  *
 538  * \internal
 539  * This function calls __DriverAPIRec::UnbindContext, and then decrements
 540  * __DRIdrawableRec::refcount which must be non-zero for a successful
 541  * return.
 542  *
 543  * While casting the opaque private pointers associated with the parameters
 544  * into their respective real types it also assures they are not \c NULL.
 545  */
 546 static int driUnbindContext(__DRIcontext *pcp)
 547 {
 548     __DRIdrawable *pdp;
 549     __DRIdrawable *prp;
 550
 551     /*
 552     ** Assume error checking is done properly in glXMakeCurrent before
 553     ** calling driUnbindContext.
 554     */
 555
 556     if (pcp == NULL)
 557         return GL_FALSE;
 558
 559     pdp = pcp->driDrawablePriv;
 560     prp = pcp->driReadablePriv;
 561
 562     /* already unbound */
 563     if (!pdp && !prp)
 564         return GL_TRUE;
 565
 566     pcp->driScreenPriv->driver->UnbindContext(pcp);
 567
 568     assert(pdp);
 569     if (pdp->refcount == 0) {
 570         /* ERROR!!! */
 571         return GL_FALSE;
 572     }
 573
 574     dri_put_drawable(pdp);
 575
 576     if (prp != pdp) {
 577         if (prp->refcount == 0) {
 578             /* ERROR!!! */
 579             return GL_FALSE;
 580         }
 581
 582         dri_put_drawable(prp);
 583     }
 584
 585     pcp->driDrawablePriv = NULL;
 586     pcp->driReadablePriv = NULL;
 587
 588     return GL_TRUE;
 589 }
 590
 591 /*@}*/
 592
 593
 594 static void dri_get_drawable(__DRIdrawable *pdp)
 595 {
 596     pdp->refcount++;
 597 }
 598
 599 static void dri_put_drawable(__DRIdrawable *pdp)
 600 {
 601     if (pdp) {
 602         pdp->refcount--;
 603         if (pdp->refcount)
 604             return;
 605
 606         pdp->driScreenPriv->driver->DestroyBuffer(pdp);
 607         free(pdp);
 608     }
 609 }
 610
 611 static __DRIdrawable *
 612 dri2CreateNewDrawable(__DRIscreen *screen,
 613                       const __DRIconfig *config,
 614                       void *data)
 615 {
 616     __DRIdrawable *pdraw;
 617
 618     pdraw = malloc(sizeof *pdraw);
 619     if (!pdraw)
 620         return NULL;
 621
 622     pdraw->loaderPrivate = data;
 623
 624     pdraw->driScreenPriv = screen;
 625     pdraw->driContextPriv = NULL;
 626     pdraw->refcount = 0;
 627     pdraw->lastStamp = 0;
 628     pdraw->w = 0;
 629     pdraw->h = 0;
 630
 631     dri_get_drawable(pdraw);
 632
 633     if (!screen->driver->CreateBuffer(screen, pdraw, &config->modes,
 634                                       GL_FALSE)) {
 635        free(pdraw);
 636        return NULL;
 637     }
 638
 639     pdraw->dri2.stamp = pdraw->lastStamp + 1;
 640
 641     return pdraw;
 642 }
 643
 644 static void
 645 driDestroyDrawable(__DRIdrawable *pdp)
 646 {
 647     dri_put_drawable(pdp);
 648 }
 649
 650 static __DRIbuffer *
 651 dri2AllocateBuffer(__DRIscreen *screen,
 652                    unsigned int attachment, unsigned int format,
 653                    int width, int height)
 654 {
 655     return screen->driver->AllocateBuffer(screen, attachment, format,
 656                                           width, height);
 657 }
 658
 659 static void
 660 dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 661 {
 662     screen->driver->ReleaseBuffer(screen, buffer);
 663 }
 664
 665
 666 static int
 667 dri2ConfigQueryb(__DRIscreen *screen, const char *var, GLboolean *val)
 668 {
 669    if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
 670       return -1;
 671
 672    *val = driQueryOptionb(&screen->optionCache, var);
 673
 674    return 0;
 675 }
 676
 677 static int
 678 dri2ConfigQueryi(__DRIscreen *screen, const char *var, GLint *val)
 679 {
 680    if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
 681        !driCheckOption(&screen->optionCache, var, DRI_ENUM))
 682       return -1;
 683
 684     *val = driQueryOptioni(&screen->optionCache, var);
 685
 686     return 0;
 687 }
 688
 689 static int
 690 dri2ConfigQueryf(__DRIscreen *screen, const char *var, GLfloat *val)
 691 {
 692    if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
 693       return -1;
 694
 695     *val = driQueryOptionf(&screen->optionCache, var);
 696
 697     return 0;
 698 }
 699
 700 static unsigned int
 701 dri2GetAPIMask(__DRIscreen *screen)
 702 {
 703     return screen->api_mask;
 704 }
 705
 706 /**
 707  * swrast swapbuffers entrypoint.
 708  *
 709  * DRI2 implements this inside the loader with only flushes handled by the
 710  * driver.
 711  */
 712 static void
 713 driSwapBuffers(__DRIdrawable *pdp)
 714 {
 715     assert(pdp->driScreenPriv->swrast_loader);
 716
 717     pdp->driScreenPriv->driver->SwapBuffers(pdp);
 718 }
 719
 720 /** Core interface */
 721 const __DRIcoreExtension driCoreExtension = {
 722     .base = { __DRI_CORE, __DRI_CORE_VERSION },
 723
 724     .createNewScreen            = NULL,
 725     .destroyScreen              = driDestroyScreen,
 726     .getExtensions              = driGetExtensions,
 727     .getConfigAttrib            = driGetConfigAttrib,
 728     .indexConfigAttrib          = driIndexConfigAttrib,
 729     .createNewDrawable          = NULL,
 730     .destroyDrawable            = driDestroyDrawable,
 731     .swapBuffers                = driSwapBuffers, /* swrast */
 732     .createNewContext           = dri2CreateNewContext, /* swrast */
 733     .copyContext                = driCopyContext,
 734     .destroyContext             = driDestroyContext,
 735     .bindContext                = driBindContext,
 736     .unbindContext              = driUnbindContext
 737 };
 738
 739 /** DRI2 interface */
 740 const __DRIdri2Extension driDRI2Extension = {
 741     .base = { __DRI_DRI2, 4 },
 742
 743     .createNewScreen            = dri2CreateNewScreen,
 744     .createNewDrawable          = dri2CreateNewDrawable,
 745     .createNewContext           = dri2CreateNewContext,
 746     .getAPIMask                 = dri2GetAPIMask,
 747     .createNewContextForAPI     = dri2CreateNewContextForAPI,
 748     .allocateBuffer             = dri2AllocateBuffer,
 749     .releaseBuffer              = dri2ReleaseBuffer,
 750     .createContextAttribs       = dri2CreateContextAttribs,
 751     .createNewScreen2           = dri2CreateNewScreen2,
 752 };
 753
 754 const __DRIswrastExtension driSWRastExtension = {
 755     { __DRI_SWRAST, 4 },
 756     driSWRastCreateNewScreen,
 757     dri2CreateNewDrawable,
 758     dri2CreateNewContextForAPI,
 759     dri2CreateContextAttribs,
 760     driSWRastCreateNewScreen2,
 761 };
 762
 763 const __DRI2configQueryExtension dri2ConfigQueryExtension = {
 764    .base = { __DRI2_CONFIG_QUERY, __DRI2_CONFIG_QUERY_VERSION },
 765
 766    .configQueryb        = dri2ConfigQueryb,
 767    .configQueryi        = dri2ConfigQueryi,
 768    .configQueryf        = dri2ConfigQueryf,
 769 };
 770
 771 void
 772 dri2InvalidateDrawable(__DRIdrawable *drawable)
 773 {
 774     drawable->dri2.stamp++;
 775 }
 776
 777 /**
 778  * Check that the gl_framebuffer associated with dPriv is the right size.
 779  * Resize the gl_framebuffer if needed.
 780  * It's expected that the dPriv->driverPrivate member points to a
 781  * gl_framebuffer object.
 782  */
 783 void
 784 driUpdateFramebufferSize(struct gl_context *ctx, const __DRIdrawable *dPriv)
 785 {
 786    struct gl_framebuffer *fb = (struct gl_framebuffer *) dPriv->driverPrivate;
 787    if (fb && (dPriv->w != fb->Width || dPriv->h != fb->Height)) {
 788       ctx->Driver.ResizeBuffers(ctx, fb, dPriv->w, dPriv->h);
 789       /* if the driver needs the hw lock for ResizeBuffers, the drawable
 790          might have changed again by now */
 791       assert(fb->Width == dPriv->w);
 792       assert(fb->Height == dPriv->h);
 793    }
 794 }