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 driCreateNewScreen2(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 driCreateNewScreen2(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 driCreateNewScreen2(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 driCreateNewScreen2(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 driCreateContextAttribs(__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     bool notify_reset = false;
 310
 311     assert((num_attribs == 0) || (attribs != NULL));
 312
 313     if (!(screen->api_mask & (1 << api))) {
 314         *error = __DRI_CTX_ERROR_BAD_API;
 315         return NULL;
 316     }
 317
 318     switch (api) {
 319     case __DRI_API_OPENGL:
 320         mesa_api = API_OPENGL_COMPAT;
 321         break;
 322     case __DRI_API_GLES:
 323         mesa_api = API_OPENGLES;
 324         break;
 325     case __DRI_API_GLES2:
 326     case __DRI_API_GLES3:
 327         mesa_api = API_OPENGLES2;
 328         break;
 329     case __DRI_API_OPENGL_CORE:
 330         mesa_api = API_OPENGL_CORE;
 331         break;
 332     default:
 333         *error = __DRI_CTX_ERROR_BAD_API;
 334         return NULL;
 335     }
 336
 337     for (unsigned i = 0; i < num_attribs; i++) {
 338         switch (attribs[i * 2]) {
 339         case __DRI_CTX_ATTRIB_MAJOR_VERSION:
 340             major_version = attribs[i * 2 + 1];
 341             break;
 342         case __DRI_CTX_ATTRIB_MINOR_VERSION:
 343             minor_version = attribs[i * 2 + 1];
 344             break;
 345         case __DRI_CTX_ATTRIB_FLAGS:
 346             flags = attribs[i * 2 + 1];
 347             break;
 348         case __DRI_CTX_ATTRIB_RESET_STRATEGY:
 349             notify_reset = (attribs[i * 2 + 1]
 350                             != __DRI_CTX_RESET_NO_NOTIFICATION);
 351             break;
 352         default:
 353             /* We can't create a context that satisfies the requirements of an
 354              * attribute that we don't understand.  Return failure.
 355              */
 356             assert(!"Should not get here.");
 357             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 358             return NULL;
 359         }
 360     }
 361
 362     /* Mesa does not support the GL_ARB_compatibilty extension or the
 363      * compatibility profile.  This means that we treat a API_OPENGL_COMPAT 3.1 as
 364      * API_OPENGL_CORE and reject API_OPENGL_COMPAT 3.2+.
 365      */
 366     if (mesa_api == API_OPENGL_COMPAT && major_version == 3 && minor_version == 1)
 367        mesa_api = API_OPENGL_CORE;
 368
 369     if (mesa_api == API_OPENGL_COMPAT
 370         && ((major_version > 3)
 371             || (major_version == 3 && minor_version >= 2))) {
 372        *error = __DRI_CTX_ERROR_BAD_API;
 373        return NULL;
 374     }
 375
 376     /* The EGL_KHR_create_context spec says:
 377      *
 378      *     "Flags are only defined for OpenGL context creation, and specifying
 379      *     a flags value other than zero for other types of contexts,
 380      *     including OpenGL ES contexts, will generate an error."
 381      *
 382      * The GLX_EXT_create_context_es2_profile specification doesn't say
 383      * anything specific about this case.  However, none of the known flags
 384      * have any meaning in an ES context, so this seems safe.
 385      */
 386     if (mesa_api != API_OPENGL_COMPAT
 387         && mesa_api != API_OPENGL_CORE
 388         && flags != 0) {
 389         *error = __DRI_CTX_ERROR_BAD_FLAG;
 390         return NULL;
 391     }
 392
 393     /* There are no forward-compatible contexts before OpenGL 3.0.  The
 394      * GLX_ARB_create_context spec says:
 395      *
 396      *     "Forward-compatible contexts are defined only for OpenGL versions
 397      *     3.0 and later."
 398      *
 399      * Forward-looking contexts are supported by silently converting the
 400      * requested API to API_OPENGL_CORE.
 401      *
 402      * In Mesa, a debug context is the same as a regular context.
 403      */
 404     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
 405        mesa_api = API_OPENGL_CORE;
 406     }
 407
 408     if ((flags & ~(__DRI_CTX_FLAG_DEBUG | __DRI_CTX_FLAG_FORWARD_COMPATIBLE))
 409         != 0) {
 410         *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
 411         return NULL;
 412     }
 413
 414     if (!validate_context_version(screen, mesa_api,
 415                                   major_version, minor_version, error))
 416        return NULL;
 417
 418     context = calloc(1, sizeof *context);
 419     if (!context) {
 420         *error = __DRI_CTX_ERROR_NO_MEMORY;
 421         return NULL;
 422     }
 423
 424     context->loaderPrivate = data;
 425
 426     context->driScreenPriv = screen;
 427     context->driDrawablePriv = NULL;
 428     context->driReadablePriv = NULL;
 429
 430     if (!screen->driver->CreateContext(mesa_api, modes, context,
 431                                        major_version, minor_version,
 432                                        flags, notify_reset, error, shareCtx)) {
 433         free(context);
 434         return NULL;
 435     }
 436
 437     struct gl_context *ctx = context->driverPrivate;
 438     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0)
 439         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 440     if ((flags & __DRI_CTX_FLAG_DEBUG) != 0) {
 441         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 442         ctx->Debug.DebugOutput = GL_TRUE;
 443     }
 444
 445     *error = __DRI_CTX_ERROR_SUCCESS;
 446     return context;
 447 }
 448
 449 static __DRIcontext *
 450 driCreateNewContextForAPI(__DRIscreen *screen, int api,
 451                           const __DRIconfig *config,
 452                           __DRIcontext *shared, void *data)
 453 {
 454     unsigned error;
 455
 456     return driCreateContextAttribs(screen, api, config, shared, 0, NULL,
 457                                    &error, data);
 458 }
 459
 460 static __DRIcontext *
 461 driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 462                     __DRIcontext *shared, void *data)
 463 {
 464     return driCreateNewContextForAPI(screen, __DRI_API_OPENGL,
 465                                      config, shared, data);
 466 }
 467
 468 /**
 469  * Destroy the per-context private information.
 470  *
 471  * \internal
 472  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
 473  * drmDestroyContext(), and finally frees \p contextPrivate.
 474  */
 475 static void
 476 driDestroyContext(__DRIcontext *pcp)
 477 {
 478     if (pcp) {
 479         pcp->driScreenPriv->driver->DestroyContext(pcp);
 480         free(pcp);
 481     }
 482 }
 483
 484 static int
 485 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
 486 {
 487     (void) dest;
 488     (void) src;
 489     (void) mask;
 490     return GL_FALSE;
 491 }
 492
 493 /*@}*/
 494
 495
 496 /*****************************************************************/
 497 /** \name Context (un)binding functions                          */
 498 /*****************************************************************/
 499 /*@{*/
 500
 501 static void dri_get_drawable(__DRIdrawable *pdp);
 502 static void dri_put_drawable(__DRIdrawable *pdp);
 503
 504 /**
 505  * This function takes both a read buffer and a draw buffer.  This is needed
 506  * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
 507  * function.
 508  */
 509 static int driBindContext(__DRIcontext *pcp,
 510                           __DRIdrawable *pdp,
 511                           __DRIdrawable *prp)
 512 {
 513     /*
 514     ** Assume error checking is done properly in glXMakeCurrent before
 515     ** calling driUnbindContext.
 516     */
 517
 518     if (!pcp)
 519         return GL_FALSE;
 520
 521     /* Bind the drawable to the context */
 522     pcp->driDrawablePriv = pdp;
 523     pcp->driReadablePriv = prp;
 524     if (pdp) {
 525         pdp->driContextPriv = pcp;
 526         dri_get_drawable(pdp);
 527     }
 528     if (prp && pdp != prp) {
 529         dri_get_drawable(prp);
 530     }
 531
 532     return pcp->driScreenPriv->driver->MakeCurrent(pcp, pdp, prp);
 533 }
 534
 535 /**
 536  * Unbind context.
 537  *
 538  * \param scrn the screen.
 539  * \param gc context.
 540  *
 541  * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
 542  *
 543  * \internal
 544  * This function calls __DriverAPIRec::UnbindContext, and then decrements
 545  * __DRIdrawableRec::refcount which must be non-zero for a successful
 546  * return.
 547  *
 548  * While casting the opaque private pointers associated with the parameters
 549  * into their respective real types it also assures they are not \c NULL.
 550  */
 551 static int driUnbindContext(__DRIcontext *pcp)
 552 {
 553     __DRIdrawable *pdp;
 554     __DRIdrawable *prp;
 555
 556     /*
 557     ** Assume error checking is done properly in glXMakeCurrent before
 558     ** calling driUnbindContext.
 559     */
 560
 561     if (pcp == NULL)
 562         return GL_FALSE;
 563
 564     pdp = pcp->driDrawablePriv;
 565     prp = pcp->driReadablePriv;
 566
 567     /* already unbound */
 568     if (!pdp && !prp)
 569         return GL_TRUE;
 570
 571     pcp->driScreenPriv->driver->UnbindContext(pcp);
 572
 573     assert(pdp);
 574     if (pdp->refcount == 0) {
 575         /* ERROR!!! */
 576         return GL_FALSE;
 577     }
 578
 579     dri_put_drawable(pdp);
 580
 581     if (prp != pdp) {
 582         if (prp->refcount == 0) {
 583             /* ERROR!!! */
 584             return GL_FALSE;
 585         }
 586
 587         dri_put_drawable(prp);
 588     }
 589
 590     pcp->driDrawablePriv = NULL;
 591     pcp->driReadablePriv = NULL;
 592
 593     return GL_TRUE;
 594 }
 595
 596 /*@}*/
 597
 598
 599 static void dri_get_drawable(__DRIdrawable *pdp)
 600 {
 601     pdp->refcount++;
 602 }
 603
 604 static void dri_put_drawable(__DRIdrawable *pdp)
 605 {
 606     if (pdp) {
 607         pdp->refcount--;
 608         if (pdp->refcount)
 609             return;
 610
 611         pdp->driScreenPriv->driver->DestroyBuffer(pdp);
 612         free(pdp);
 613     }
 614 }
 615
 616 static __DRIdrawable *
 617 driCreateNewDrawable(__DRIscreen *screen,
 618                      const __DRIconfig *config,
 619                      void *data)
 620 {
 621     __DRIdrawable *pdraw;
 622
 623     pdraw = malloc(sizeof *pdraw);
 624     if (!pdraw)
 625         return NULL;
 626
 627     pdraw->loaderPrivate = data;
 628
 629     pdraw->driScreenPriv = screen;
 630     pdraw->driContextPriv = NULL;
 631     pdraw->refcount = 0;
 632     pdraw->lastStamp = 0;
 633     pdraw->w = 0;
 634     pdraw->h = 0;
 635
 636     dri_get_drawable(pdraw);
 637
 638     if (!screen->driver->CreateBuffer(screen, pdraw, &config->modes,
 639                                       GL_FALSE)) {
 640        free(pdraw);
 641        return NULL;
 642     }
 643
 644     pdraw->dri2.stamp = pdraw->lastStamp + 1;
 645
 646     return pdraw;
 647 }
 648
 649 static void
 650 driDestroyDrawable(__DRIdrawable *pdp)
 651 {
 652     dri_put_drawable(pdp);
 653 }
 654
 655 static __DRIbuffer *
 656 dri2AllocateBuffer(__DRIscreen *screen,
 657                    unsigned int attachment, unsigned int format,
 658                    int width, int height)
 659 {
 660     return screen->driver->AllocateBuffer(screen, attachment, format,
 661                                           width, height);
 662 }
 663
 664 static void
 665 dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 666 {
 667     screen->driver->ReleaseBuffer(screen, buffer);
 668 }
 669
 670
 671 static int
 672 dri2ConfigQueryb(__DRIscreen *screen, const char *var, GLboolean *val)
 673 {
 674    if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
 675       return -1;
 676
 677    *val = driQueryOptionb(&screen->optionCache, var);
 678
 679    return 0;
 680 }
 681
 682 static int
 683 dri2ConfigQueryi(__DRIscreen *screen, const char *var, GLint *val)
 684 {
 685    if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
 686        !driCheckOption(&screen->optionCache, var, DRI_ENUM))
 687       return -1;
 688
 689     *val = driQueryOptioni(&screen->optionCache, var);
 690
 691     return 0;
 692 }
 693
 694 static int
 695 dri2ConfigQueryf(__DRIscreen *screen, const char *var, GLfloat *val)
 696 {
 697    if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
 698       return -1;
 699
 700     *val = driQueryOptionf(&screen->optionCache, var);
 701
 702     return 0;
 703 }
 704
 705 static unsigned int
 706 driGetAPIMask(__DRIscreen *screen)
 707 {
 708     return screen->api_mask;
 709 }
 710
 711 /**
 712  * swrast swapbuffers entrypoint.
 713  *
 714  * DRI2 implements this inside the loader with only flushes handled by the
 715  * driver.
 716  */
 717 static void
 718 driSwapBuffers(__DRIdrawable *pdp)
 719 {
 720     assert(pdp->driScreenPriv->swrast_loader);
 721
 722     pdp->driScreenPriv->driver->SwapBuffers(pdp);
 723 }
 724
 725 /** Core interface */
 726 const __DRIcoreExtension driCoreExtension = {
 727     .base = { __DRI_CORE, __DRI_CORE_VERSION },
 728
 729     .createNewScreen            = NULL,
 730     .destroyScreen              = driDestroyScreen,
 731     .getExtensions              = driGetExtensions,
 732     .getConfigAttrib            = driGetConfigAttrib,
 733     .indexConfigAttrib          = driIndexConfigAttrib,
 734     .createNewDrawable          = NULL,
 735     .destroyDrawable            = driDestroyDrawable,
 736     .swapBuffers                = driSwapBuffers, /* swrast */
 737     .createNewContext           = driCreateNewContext, /* swrast */
 738     .copyContext                = driCopyContext,
 739     .destroyContext             = driDestroyContext,
 740     .bindContext                = driBindContext,
 741     .unbindContext              = driUnbindContext
 742 };
 743
 744 /** DRI2 interface */
 745 const __DRIdri2Extension driDRI2Extension = {
 746     .base = { __DRI_DRI2, 4 },
 747
 748     .createNewScreen            = dri2CreateNewScreen,
 749     .createNewDrawable          = driCreateNewDrawable,
 750     .createNewContext           = driCreateNewContext,
 751     .getAPIMask                 = driGetAPIMask,
 752     .createNewContextForAPI     = driCreateNewContextForAPI,
 753     .allocateBuffer             = dri2AllocateBuffer,
 754     .releaseBuffer              = dri2ReleaseBuffer,
 755     .createContextAttribs       = driCreateContextAttribs,
 756     .createNewScreen2           = driCreateNewScreen2,
 757 };
 758
 759 const __DRIswrastExtension driSWRastExtension = {
 760     { __DRI_SWRAST, 4 },
 761     driSWRastCreateNewScreen,
 762     driCreateNewDrawable,
 763     driCreateNewContextForAPI,
 764     driCreateContextAttribs,
 765     driSWRastCreateNewScreen2,
 766 };
 767
 768 const __DRI2configQueryExtension dri2ConfigQueryExtension = {
 769    .base = { __DRI2_CONFIG_QUERY, __DRI2_CONFIG_QUERY_VERSION },
 770
 771    .configQueryb        = dri2ConfigQueryb,
 772    .configQueryi        = dri2ConfigQueryi,
 773    .configQueryf        = dri2ConfigQueryf,
 774 };
 775
 776 void
 777 dri2InvalidateDrawable(__DRIdrawable *drawable)
 778 {
 779     drawable->dri2.stamp++;
 780 }
 781
 782 /**
 783  * Check that the gl_framebuffer associated with dPriv is the right size.
 784  * Resize the gl_framebuffer if needed.
 785  * It's expected that the dPriv->driverPrivate member points to a
 786  * gl_framebuffer object.
 787  */
 788 void
 789 driUpdateFramebufferSize(struct gl_context *ctx, const __DRIdrawable *dPriv)
 790 {
 791    struct gl_framebuffer *fb = (struct gl_framebuffer *) dPriv->driverPrivate;
 792    if (fb && (dPriv->w != fb->Width || dPriv->h != fb->Height)) {
 793       ctx->Driver.ResizeBuffers(ctx, fb, dPriv->w, dPriv->h);
 794       /* if the driver needs the hw lock for ResizeBuffers, the drawable
 795          might have changed again by now */
 796       assert(fb->Width == dPriv->w);
 797       assert(fb->Height == dPriv->h);
 798    }
 799 }
 800
 801 uint32_t
 802 driGLFormatToImageFormat(gl_format format)
 803 {
 804    switch (format) {
 805    case MESA_FORMAT_RGB565:
 806       return __DRI_IMAGE_FORMAT_RGB565;
 807    case MESA_FORMAT_XRGB8888:
 808       return __DRI_IMAGE_FORMAT_XRGB8888;
 809    case MESA_FORMAT_ARGB2101010:
 810       return __DRI_IMAGE_FORMAT_ARGB2101010;
 811    case MESA_FORMAT_XRGB2101010_UNORM:
 812       return __DRI_IMAGE_FORMAT_XRGB2101010;
 813    case MESA_FORMAT_ARGB8888:
 814       return __DRI_IMAGE_FORMAT_ARGB8888;
 815    case MESA_FORMAT_RGBA8888_REV:
 816       return __DRI_IMAGE_FORMAT_ABGR8888;
 817    case MESA_FORMAT_RGBX8888_REV:
 818       return __DRI_IMAGE_FORMAT_XBGR8888;
 819    case MESA_FORMAT_R8:
 820       return __DRI_IMAGE_FORMAT_R8;
 821    case MESA_FORMAT_GR88:
 822       return __DRI_IMAGE_FORMAT_GR88;
 823    case MESA_FORMAT_NONE:
 824       return __DRI_IMAGE_FORMAT_NONE;
 825    case MESA_FORMAT_SARGB8:
 826       return __DRI_IMAGE_FORMAT_SARGB8;
 827    default:
 828       return 0;
 829    }
 830 }
 831
 832 gl_format
 833 driImageFormatToGLFormat(uint32_t image_format)
 834 {
 835    switch (image_format) {
 836    case __DRI_IMAGE_FORMAT_RGB565:
 837       return MESA_FORMAT_RGB565;
 838    case __DRI_IMAGE_FORMAT_XRGB8888:
 839       return MESA_FORMAT_XRGB8888;
 840    case __DRI_IMAGE_FORMAT_ARGB2101010:
 841       return MESA_FORMAT_ARGB2101010;
 842    case __DRI_IMAGE_FORMAT_XRGB2101010:
 843       return MESA_FORMAT_XRGB2101010_UNORM;
 844    case __DRI_IMAGE_FORMAT_ARGB8888:
 845       return MESA_FORMAT_ARGB8888;
 846    case __DRI_IMAGE_FORMAT_ABGR8888:
 847       return MESA_FORMAT_RGBA8888_REV;
 848    case __DRI_IMAGE_FORMAT_XBGR8888:
 849       return MESA_FORMAT_RGBX8888_REV;
 850    case __DRI_IMAGE_FORMAT_R8:
 851       return MESA_FORMAT_R8;
 852    case __DRI_IMAGE_FORMAT_GR88:
 853       return MESA_FORMAT_GR88;
 854    case __DRI_IMAGE_FORMAT_SARGB8:
 855       return MESA_FORMAT_SARGB8;
 856    case __DRI_IMAGE_FORMAT_NONE:
 857       return MESA_FORMAT_NONE;
 858    default:
 859       return MESA_FORMAT_NONE;
 860    }
 861 }