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/errors.h"
  53 #include "main/macros.h"
  54
  55 const char __dri2ConfigOptions[] =
  56    DRI_CONF_BEGIN
  57       DRI_CONF_SECTION_PERFORMANCE
  58          DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_1)
  59       DRI_CONF_SECTION_END
  60    DRI_CONF_END;
  61
  62 /*****************************************************************/
  63 /** \name Screen handling functions                              */
  64 /*****************************************************************/
  65 /*@{*/
  66
  67 static void
  68 setupLoaderExtensions(__DRIscreen *psp,
  69                       const __DRIextension **extensions)
  70 {
  71     int i;
  72
  73     for (i = 0; extensions[i]; i++) {
  74         if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
  75             psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
  76         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)
  77             psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];
  78         if (strcmp(extensions[i]->name, __DRI_USE_INVALIDATE) == 0)
  79             psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];
  80         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
  81             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
  82         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOADER) == 0)
  83            psp->image.loader = (__DRIimageLoaderExtension *) extensions[i];
  84     }
  85 }
  86
  87 /**
  88  * This pointer determines which driver API we'll use in the case of the
  89  * loader not passing us an explicit driver extensions list (that would,
  90  * itself, contain a pointer to a driver API.)
  91  *
  92  * A driver's driDriverGetExtensions_drivername() can update this pointer to
  93  * what it's returning, and a loader that is ignorant of createNewScreen2()
  94  * will get the correct driver screen created, as long as no other
  95  * driDriverGetExtensions() happened in between the first one and the
  96  * createNewScreen().
  97  *
  98  * This allows the X Server to not require the significant dri_interface.h
  99  * updates for doing createNewScreen2(), which would discourage backporting of
 100  * the X Server patches to support the new loader interface.
 101  */
 102 const struct __DriverAPIRec *globalDriverAPI = &driDriverAPI;
 103
 104 /**
 105  * This is the first entrypoint in the driver called by the DRI driver loader
 106  * after dlopen()ing it.
 107  *
 108  * It's used to create global state for the driver across contexts on the same
 109  * Display.
 110  */
 111 static __DRIscreen *
 112 driCreateNewScreen2(int scrn, int fd,
 113                     const __DRIextension **extensions,
 114                     const __DRIextension **driver_extensions,
 115                     const __DRIconfig ***driver_configs, void *data)
 116 {
 117     static const __DRIextension *emptyExtensionList[] = { NULL };
 118     __DRIscreen *psp;
 119
 120     psp = calloc(1, sizeof(*psp));
 121     if (!psp)
 122         return NULL;
 123
 124     /* By default, use the global driDriverAPI symbol (non-megadrivers). */
 125     psp->driver = globalDriverAPI;
 126
 127     /* If the driver exposes its vtable through its extensions list
 128      * (megadrivers), use that instead.
 129      */
 130     if (driver_extensions) {
 131        for (int i = 0; driver_extensions[i]; i++) {
 132           if (strcmp(driver_extensions[i]->name, __DRI_DRIVER_VTABLE) == 0) {
 133              psp->driver =
 134                 ((__DRIDriverVtableExtension *)driver_extensions[i])->vtable;
 135           }
 136        }
 137     }
 138
 139     setupLoaderExtensions(psp, extensions);
 140
 141 #ifndef __NOT_HAVE_DRM_H
 142     if (fd != -1) {
 143        drmVersionPtr version = drmGetVersion(fd);
 144        if (version) {
 145           psp->drm_version.major = version->version_major;
 146           psp->drm_version.minor = version->version_minor;
 147           psp->drm_version.patch = version->version_patchlevel;
 148           drmFreeVersion(version);
 149        }
 150     }
 151 #endif
 152
 153     psp->loaderPrivate = data;
 154
 155     psp->extensions = emptyExtensionList;
 156     psp->fd = fd;
 157     psp->myNum = scrn;
 158
 159     *driver_configs = psp->driver->InitScreen(psp);
 160     if (*driver_configs == NULL) {
 161         free(psp);
 162         return NULL;
 163     }
 164
 165     int gl_version_override = _mesa_get_gl_version_override();
 166     if (gl_version_override >= 31) {
 167        psp->max_gl_core_version = MAX2(psp->max_gl_core_version,
 168                                        gl_version_override);
 169     } else {
 170        psp->max_gl_compat_version = MAX2(psp->max_gl_compat_version,
 171                                          gl_version_override);
 172     }
 173
 174     psp->api_mask = (1 << __DRI_API_OPENGL);
 175     if (psp->max_gl_core_version > 0)
 176        psp->api_mask |= (1 << __DRI_API_OPENGL_CORE);
 177     if (psp->max_gl_es1_version > 0)
 178        psp->api_mask |= (1 << __DRI_API_GLES);
 179     if (psp->max_gl_es2_version > 0)
 180        psp->api_mask |= (1 << __DRI_API_GLES2);
 181     if (psp->max_gl_es2_version >= 30)
 182        psp->api_mask |= (1 << __DRI_API_GLES3);
 183
 184     driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions);
 185     driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum, "dri2");
 186
 187
 188     return psp;
 189 }
 190
 191 static __DRIscreen *
 192 dri2CreateNewScreen(int scrn, int fd,
 193                     const __DRIextension **extensions,
 194                     const __DRIconfig ***driver_configs, void *data)
 195 {
 196    return driCreateNewScreen2(scrn, fd, extensions, NULL,
 197                                driver_configs, data);
 198 }
 199
 200 /** swrast driver createNewScreen entrypoint. */
 201 static __DRIscreen *
 202 driSWRastCreateNewScreen(int scrn, const __DRIextension **extensions,
 203                          const __DRIconfig ***driver_configs, void *data)
 204 {
 205    return driCreateNewScreen2(scrn, -1, extensions, NULL,
 206                                driver_configs, data);
 207 }
 208
 209 static __DRIscreen *
 210 driSWRastCreateNewScreen2(int scrn, const __DRIextension **extensions,
 211                           const __DRIextension **driver_extensions,
 212                           const __DRIconfig ***driver_configs, void *data)
 213 {
 214    return driCreateNewScreen2(scrn, -1, extensions, driver_extensions,
 215                                driver_configs, data);
 216 }
 217
 218 /**
 219  * Destroy the per-screen private information.
 220  *
 221  * \internal
 222  * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
 223  * drmClose(), and finally frees \p screenPrivate.
 224  */
 225 static void driDestroyScreen(__DRIscreen *psp)
 226 {
 227     if (psp) {
 228         /* No interaction with the X-server is possible at this point.  This
 229          * routine is called after XCloseDisplay, so there is no protocol
 230          * stream open to the X-server anymore.
 231          */
 232
 233        _mesa_destroy_shader_compiler();
 234
 235         psp->driver->DestroyScreen(psp);
 236
 237         driDestroyOptionCache(&psp->optionCache);
 238         driDestroyOptionInfo(&psp->optionInfo);
 239
 240         free(psp);
 241     }
 242 }
 243
 244 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 245 {
 246     return psp->extensions;
 247 }
 248
 249 /*@}*/
 250
 251
 252 static bool
 253 validate_context_version(__DRIscreen *screen,
 254                          int mesa_api,
 255                          unsigned major_version,
 256                          unsigned minor_version,
 257                          unsigned *dri_ctx_error)
 258 {
 259    unsigned req_version = 10 * major_version + minor_version;
 260    unsigned max_version = 0;
 261
 262    switch (mesa_api) {
 263    case API_OPENGL_COMPAT:
 264       max_version = screen->max_gl_compat_version;
 265       break;
 266    case API_OPENGL_CORE:
 267       max_version = screen->max_gl_core_version;
 268       break;
 269    case API_OPENGLES:
 270       max_version = screen->max_gl_es1_version;
 271       break;
 272    case API_OPENGLES2:
 273       max_version = screen->max_gl_es2_version;
 274       break;
 275    default:
 276       max_version = 0;
 277       break;
 278    }
 279
 280    if (max_version == 0) {
 281       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
 282       return false;
 283    } else if (req_version > max_version) {
 284       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
 285       return false;
 286    }
 287
 288    return true;
 289 }
 290
 291 /*****************************************************************/
 292 /** \name Context handling functions                             */
 293 /*****************************************************************/
 294 /*@{*/
 295
 296 static __DRIcontext *
 297 driCreateContextAttribs(__DRIscreen *screen, int api,
 298                         const __DRIconfig *config,
 299                         __DRIcontext *shared,
 300                         unsigned num_attribs,
 301                         const uint32_t *attribs,
 302                         unsigned *error,
 303                         void *data)
 304 {
 305     __DRIcontext *context;
 306     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
 307     void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 308     gl_api mesa_api;
 309     unsigned major_version = 1;
 310     unsigned minor_version = 0;
 311     uint32_t flags = 0;
 312     bool notify_reset = false;
 313
 314     assert((num_attribs == 0) || (attribs != NULL));
 315
 316     if (!(screen->api_mask & (1 << api))) {
 317         *error = __DRI_CTX_ERROR_BAD_API;
 318         return NULL;
 319     }
 320
 321     switch (api) {
 322     case __DRI_API_OPENGL:
 323         mesa_api = API_OPENGL_COMPAT;
 324         break;
 325     case __DRI_API_GLES:
 326         mesa_api = API_OPENGLES;
 327         break;
 328     case __DRI_API_GLES2:
 329     case __DRI_API_GLES3:
 330         mesa_api = API_OPENGLES2;
 331         break;
 332     case __DRI_API_OPENGL_CORE:
 333         mesa_api = API_OPENGL_CORE;
 334         break;
 335     default:
 336         *error = __DRI_CTX_ERROR_BAD_API;
 337         return NULL;
 338     }
 339
 340     for (unsigned i = 0; i < num_attribs; i++) {
 341         switch (attribs[i * 2]) {
 342         case __DRI_CTX_ATTRIB_MAJOR_VERSION:
 343             major_version = attribs[i * 2 + 1];
 344             break;
 345         case __DRI_CTX_ATTRIB_MINOR_VERSION:
 346             minor_version = attribs[i * 2 + 1];
 347             break;
 348         case __DRI_CTX_ATTRIB_FLAGS:
 349             flags = attribs[i * 2 + 1];
 350             break;
 351         case __DRI_CTX_ATTRIB_RESET_STRATEGY:
 352             notify_reset = (attribs[i * 2 + 1]
 353                             != __DRI_CTX_RESET_NO_NOTIFICATION);
 354             break;
 355         default:
 356             /* We can't create a context that satisfies the requirements of an
 357              * attribute that we don't understand.  Return failure.
 358              */
 359             assert(!"Should not get here.");
 360             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 361             return NULL;
 362         }
 363     }
 364
 365     /* Mesa does not support the GL_ARB_compatibilty extension or the
 366      * compatibility profile.  This means that we treat a API_OPENGL_COMPAT 3.1 as
 367      * API_OPENGL_CORE and reject API_OPENGL_COMPAT 3.2+.
 368      */
 369     if (mesa_api == API_OPENGL_COMPAT && major_version == 3 && minor_version == 1)
 370        mesa_api = API_OPENGL_CORE;
 371
 372     if (mesa_api == API_OPENGL_COMPAT
 373         && ((major_version > 3)
 374             || (major_version == 3 && minor_version >= 2))) {
 375        *error = __DRI_CTX_ERROR_BAD_API;
 376        return NULL;
 377     }
 378
 379     /* The latest version of EGL_KHR_create_context spec says:
 380      *
 381      *     "If the EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR flag bit is set in
 382      *     EGL_CONTEXT_FLAGS_KHR, then a <debug context> will be created.
 383      *     [...] This bit is supported for OpenGL and OpenGL ES contexts.
 384      *
 385      * None of the other flags have any meaning in an ES context, so this seems safe.
 386      */
 387     if (mesa_api != API_OPENGL_COMPAT
 388         && mesa_api != API_OPENGL_CORE
 389         && (flags & ~__DRI_CTX_FLAG_DEBUG)) {
 390         *error = __DRI_CTX_ERROR_BAD_FLAG;
 391         return NULL;
 392     }
 393
 394     /* There are no forward-compatible contexts before OpenGL 3.0.  The
 395      * GLX_ARB_create_context spec says:
 396      *
 397      *     "Forward-compatible contexts are defined only for OpenGL versions
 398      *     3.0 and later."
 399      *
 400      * Forward-looking contexts are supported by silently converting the
 401      * requested API to API_OPENGL_CORE.
 402      *
 403      * In Mesa, a debug context is the same as a regular context.
 404      */
 405     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
 406        mesa_api = API_OPENGL_CORE;
 407     }
 408
 409     const uint32_t allowed_flags = (__DRI_CTX_FLAG_DEBUG
 410                                     | __DRI_CTX_FLAG_FORWARD_COMPATIBLE
 411                                     | __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS);
 412     if (flags & ~allowed_flags) {
 413         *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
 414         return NULL;
 415     }
 416
 417     if (!validate_context_version(screen, mesa_api,
 418                                   major_version, minor_version, error))
 419        return NULL;
 420
 421     context = calloc(1, sizeof *context);
 422     if (!context) {
 423         *error = __DRI_CTX_ERROR_NO_MEMORY;
 424         return NULL;
 425     }
 426
 427     context->loaderPrivate = data;
 428
 429     context->driScreenPriv = screen;
 430     context->driDrawablePriv = NULL;
 431     context->driReadablePriv = NULL;
 432
 433     if (!screen->driver->CreateContext(mesa_api, modes, context,
 434                                        major_version, minor_version,
 435                                        flags, notify_reset, error, shareCtx)) {
 436         free(context);
 437         return NULL;
 438     }
 439
 440     *error = __DRI_CTX_ERROR_SUCCESS;
 441     return context;
 442 }
 443
 444 void
 445 driContextSetFlags(struct gl_context *ctx, uint32_t flags)
 446 {
 447     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0)
 448         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 449     if ((flags & __DRI_CTX_FLAG_DEBUG) != 0) {
 450        _mesa_set_debug_state_int(ctx, GL_DEBUG_OUTPUT, GL_TRUE);
 451         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 452     }
 453 }
 454
 455 static __DRIcontext *
 456 driCreateNewContextForAPI(__DRIscreen *screen, int api,
 457                           const __DRIconfig *config,
 458                           __DRIcontext *shared, void *data)
 459 {
 460     unsigned error;
 461
 462     return driCreateContextAttribs(screen, api, config, shared, 0, NULL,
 463                                    &error, data);
 464 }
 465
 466 static __DRIcontext *
 467 driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 468                     __DRIcontext *shared, void *data)
 469 {
 470     return driCreateNewContextForAPI(screen, __DRI_API_OPENGL,
 471                                      config, shared, data);
 472 }
 473
 474 /**
 475  * Destroy the per-context private information.
 476  *
 477  * \internal
 478  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
 479  * drmDestroyContext(), and finally frees \p contextPrivate.
 480  */
 481 static void
 482 driDestroyContext(__DRIcontext *pcp)
 483 {
 484     if (pcp) {
 485         pcp->driScreenPriv->driver->DestroyContext(pcp);
 486         free(pcp);
 487     }
 488 }
 489
 490 static int
 491 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
 492 {
 493     (void) dest;
 494     (void) src;
 495     (void) mask;
 496     return GL_FALSE;
 497 }
 498
 499 /*@}*/
 500
 501
 502 /*****************************************************************/
 503 /** \name Context (un)binding functions                          */
 504 /*****************************************************************/
 505 /*@{*/
 506
 507 static void dri_get_drawable(__DRIdrawable *pdp);
 508 static void dri_put_drawable(__DRIdrawable *pdp);
 509
 510 /**
 511  * This function takes both a read buffer and a draw buffer.  This is needed
 512  * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
 513  * function.
 514  */
 515 static int driBindContext(__DRIcontext *pcp,
 516                           __DRIdrawable *pdp,
 517                           __DRIdrawable *prp)
 518 {
 519     /*
 520     ** Assume error checking is done properly in glXMakeCurrent before
 521     ** calling driUnbindContext.
 522     */
 523
 524     if (!pcp)
 525         return GL_FALSE;
 526
 527     /* Bind the drawable to the context */
 528     pcp->driDrawablePriv = pdp;
 529     pcp->driReadablePriv = prp;
 530     if (pdp) {
 531         pdp->driContextPriv = pcp;
 532         dri_get_drawable(pdp);
 533     }
 534     if (prp && pdp != prp) {
 535         dri_get_drawable(prp);
 536     }
 537
 538     return pcp->driScreenPriv->driver->MakeCurrent(pcp, pdp, prp);
 539 }
 540
 541 /**
 542  * Unbind context.
 543  *
 544  * \param scrn the screen.
 545  * \param gc context.
 546  *
 547  * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
 548  *
 549  * \internal
 550  * This function calls __DriverAPIRec::UnbindContext, and then decrements
 551  * __DRIdrawableRec::refcount which must be non-zero for a successful
 552  * return.
 553  *
 554  * While casting the opaque private pointers associated with the parameters
 555  * into their respective real types it also assures they are not \c NULL.
 556  */
 557 static int driUnbindContext(__DRIcontext *pcp)
 558 {
 559     __DRIdrawable *pdp;
 560     __DRIdrawable *prp;
 561
 562     /*
 563     ** Assume error checking is done properly in glXMakeCurrent before
 564     ** calling driUnbindContext.
 565     */
 566
 567     if (pcp == NULL)
 568         return GL_FALSE;
 569
 570     /*
 571     ** Call driUnbindContext before checking for valid drawables
 572     ** to handle surfaceless contexts properly.
 573     */
 574     pcp->driScreenPriv->driver->UnbindContext(pcp);
 575
 576     pdp = pcp->driDrawablePriv;
 577     prp = pcp->driReadablePriv;
 578
 579     /* already unbound */
 580     if (!pdp && !prp)
 581         return GL_TRUE;
 582
 583     assert(pdp);
 584     if (pdp->refcount == 0) {
 585         /* ERROR!!! */
 586         return GL_FALSE;
 587     }
 588
 589     dri_put_drawable(pdp);
 590
 591     if (prp != pdp) {
 592         if (prp->refcount == 0) {
 593             /* ERROR!!! */
 594             return GL_FALSE;
 595         }
 596
 597         dri_put_drawable(prp);
 598     }
 599
 600     pcp->driDrawablePriv = NULL;
 601     pcp->driReadablePriv = NULL;
 602
 603     return GL_TRUE;
 604 }
 605
 606 /*@}*/
 607
 608
 609 static void dri_get_drawable(__DRIdrawable *pdp)
 610 {
 611     pdp->refcount++;
 612 }
 613
 614 static void dri_put_drawable(__DRIdrawable *pdp)
 615 {
 616     if (pdp) {
 617         pdp->refcount--;
 618         if (pdp->refcount)
 619             return;
 620
 621         pdp->driScreenPriv->driver->DestroyBuffer(pdp);
 622         free(pdp);
 623     }
 624 }
 625
 626 static __DRIdrawable *
 627 driCreateNewDrawable(__DRIscreen *screen,
 628                      const __DRIconfig *config,
 629                      void *data)
 630 {
 631     __DRIdrawable *pdraw;
 632
 633     pdraw = malloc(sizeof *pdraw);
 634     if (!pdraw)
 635         return NULL;
 636
 637     pdraw->loaderPrivate = data;
 638
 639     pdraw->driScreenPriv = screen;
 640     pdraw->driContextPriv = NULL;
 641     pdraw->refcount = 0;
 642     pdraw->lastStamp = 0;
 643     pdraw->w = 0;
 644     pdraw->h = 0;
 645
 646     dri_get_drawable(pdraw);
 647
 648     if (!screen->driver->CreateBuffer(screen, pdraw, &config->modes,
 649                                       GL_FALSE)) {
 650        free(pdraw);
 651        return NULL;
 652     }
 653
 654     pdraw->dri2.stamp = pdraw->lastStamp + 1;
 655
 656     return pdraw;
 657 }
 658
 659 static void
 660 driDestroyDrawable(__DRIdrawable *pdp)
 661 {
 662     dri_put_drawable(pdp);
 663 }
 664
 665 static __DRIbuffer *
 666 dri2AllocateBuffer(__DRIscreen *screen,
 667                    unsigned int attachment, unsigned int format,
 668                    int width, int height)
 669 {
 670     return screen->driver->AllocateBuffer(screen, attachment, format,
 671                                           width, height);
 672 }
 673
 674 static void
 675 dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 676 {
 677     screen->driver->ReleaseBuffer(screen, buffer);
 678 }
 679
 680
 681 static int
 682 dri2ConfigQueryb(__DRIscreen *screen, const char *var, unsigned char *val)
 683 {
 684    if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
 685       return -1;
 686
 687    *val = driQueryOptionb(&screen->optionCache, var);
 688
 689    return 0;
 690 }
 691
 692 static int
 693 dri2ConfigQueryi(__DRIscreen *screen, const char *var, int *val)
 694 {
 695    if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
 696        !driCheckOption(&screen->optionCache, var, DRI_ENUM))
 697       return -1;
 698
 699     *val = driQueryOptioni(&screen->optionCache, var);
 700
 701     return 0;
 702 }
 703
 704 static int
 705 dri2ConfigQueryf(__DRIscreen *screen, const char *var, float *val)
 706 {
 707    if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
 708       return -1;
 709
 710     *val = driQueryOptionf(&screen->optionCache, var);
 711
 712     return 0;
 713 }
 714
 715 static unsigned int
 716 driGetAPIMask(__DRIscreen *screen)
 717 {
 718     return screen->api_mask;
 719 }
 720
 721 /**
 722  * swrast swapbuffers entrypoint.
 723  *
 724  * DRI2 implements this inside the loader with only flushes handled by the
 725  * driver.
 726  */
 727 static void
 728 driSwapBuffers(__DRIdrawable *pdp)
 729 {
 730     assert(pdp->driScreenPriv->swrast_loader);
 731
 732     pdp->driScreenPriv->driver->SwapBuffers(pdp);
 733 }
 734
 735 /** Core interface */
 736 const __DRIcoreExtension driCoreExtension = {
 737     .base = { __DRI_CORE, 1 },
 738
 739     .createNewScreen            = NULL,
 740     .destroyScreen              = driDestroyScreen,
 741     .getExtensions              = driGetExtensions,
 742     .getConfigAttrib            = driGetConfigAttrib,
 743     .indexConfigAttrib          = driIndexConfigAttrib,
 744     .createNewDrawable          = NULL,
 745     .destroyDrawable            = driDestroyDrawable,
 746     .swapBuffers                = driSwapBuffers, /* swrast */
 747     .createNewContext           = driCreateNewContext, /* swrast */
 748     .copyContext                = driCopyContext,
 749     .destroyContext             = driDestroyContext,
 750     .bindContext                = driBindContext,
 751     .unbindContext              = driUnbindContext
 752 };
 753
 754 /** DRI2 interface */
 755 const __DRIdri2Extension driDRI2Extension = {
 756     .base = { __DRI_DRI2, 4 },
 757
 758     .createNewScreen            = dri2CreateNewScreen,
 759     .createNewDrawable          = driCreateNewDrawable,
 760     .createNewContext           = driCreateNewContext,
 761     .getAPIMask                 = driGetAPIMask,
 762     .createNewContextForAPI     = driCreateNewContextForAPI,
 763     .allocateBuffer             = dri2AllocateBuffer,
 764     .releaseBuffer              = dri2ReleaseBuffer,
 765     .createContextAttribs       = driCreateContextAttribs,
 766     .createNewScreen2           = driCreateNewScreen2,
 767 };
 768
 769 const __DRIswrastExtension driSWRastExtension = {
 770     .base = { __DRI_SWRAST, 4 },
 771
 772     .createNewScreen            = driSWRastCreateNewScreen,
 773     .createNewDrawable          = driCreateNewDrawable,
 774     .createNewContextForAPI     = driCreateNewContextForAPI,
 775     .createContextAttribs       = driCreateContextAttribs,
 776     .createNewScreen2           = driSWRastCreateNewScreen2,
 777 };
 778
 779 const __DRI2configQueryExtension dri2ConfigQueryExtension = {
 780    .base = { __DRI2_CONFIG_QUERY, 1 },
 781
 782    .configQueryb        = dri2ConfigQueryb,
 783    .configQueryi        = dri2ConfigQueryi,
 784    .configQueryf        = dri2ConfigQueryf,
 785 };
 786
 787 void
 788 dri2InvalidateDrawable(__DRIdrawable *drawable)
 789 {
 790     drawable->dri2.stamp++;
 791 }
 792
 793 /**
 794  * Check that the gl_framebuffer associated with dPriv is the right size.
 795  * Resize the gl_framebuffer if needed.
 796  * It's expected that the dPriv->driverPrivate member points to a
 797  * gl_framebuffer object.
 798  */
 799 void
 800 driUpdateFramebufferSize(struct gl_context *ctx, const __DRIdrawable *dPriv)
 801 {
 802    struct gl_framebuffer *fb = (struct gl_framebuffer *) dPriv->driverPrivate;
 803    if (fb && (dPriv->w != fb->Width || dPriv->h != fb->Height)) {
 804       ctx->Driver.ResizeBuffers(ctx, fb, dPriv->w, dPriv->h);
 805       /* if the driver needs the hw lock for ResizeBuffers, the drawable
 806          might have changed again by now */
 807       assert(fb->Width == dPriv->w);
 808       assert(fb->Height == dPriv->h);
 809    }
 810 }
 811
 812 uint32_t
 813 driGLFormatToImageFormat(mesa_format format)
 814 {
 815    switch (format) {
 816    case MESA_FORMAT_B5G6R5_UNORM:
 817       return __DRI_IMAGE_FORMAT_RGB565;
 818    case MESA_FORMAT_B8G8R8X8_UNORM:
 819       return __DRI_IMAGE_FORMAT_XRGB8888;
 820    case MESA_FORMAT_B10G10R10A2_UNORM:
 821       return __DRI_IMAGE_FORMAT_ARGB2101010;
 822    case MESA_FORMAT_B10G10R10X2_UNORM:
 823       return __DRI_IMAGE_FORMAT_XRGB2101010;
 824    case MESA_FORMAT_B8G8R8A8_UNORM:
 825       return __DRI_IMAGE_FORMAT_ARGB8888;
 826    case MESA_FORMAT_R8G8B8A8_UNORM:
 827       return __DRI_IMAGE_FORMAT_ABGR8888;
 828    case MESA_FORMAT_R8G8B8X8_UNORM:
 829       return __DRI_IMAGE_FORMAT_XBGR8888;
 830    case MESA_FORMAT_R_UNORM8:
 831       return __DRI_IMAGE_FORMAT_R8;
 832    case MESA_FORMAT_R8G8_UNORM:
 833       return __DRI_IMAGE_FORMAT_GR88;
 834    case MESA_FORMAT_NONE:
 835       return __DRI_IMAGE_FORMAT_NONE;
 836    case MESA_FORMAT_B8G8R8A8_SRGB:
 837       return __DRI_IMAGE_FORMAT_SARGB8;
 838    default:
 839       return 0;
 840    }
 841 }
 842
 843 mesa_format
 844 driImageFormatToGLFormat(uint32_t image_format)
 845 {
 846    switch (image_format) {
 847    case __DRI_IMAGE_FORMAT_RGB565:
 848       return MESA_FORMAT_B5G6R5_UNORM;
 849    case __DRI_IMAGE_FORMAT_XRGB8888:
 850       return MESA_FORMAT_B8G8R8X8_UNORM;
 851    case __DRI_IMAGE_FORMAT_ARGB2101010:
 852       return MESA_FORMAT_B10G10R10A2_UNORM;
 853    case __DRI_IMAGE_FORMAT_XRGB2101010:
 854       return MESA_FORMAT_B10G10R10X2_UNORM;
 855    case __DRI_IMAGE_FORMAT_ARGB8888:
 856       return MESA_FORMAT_B8G8R8A8_UNORM;
 857    case __DRI_IMAGE_FORMAT_ABGR8888:
 858       return MESA_FORMAT_R8G8B8A8_UNORM;
 859    case __DRI_IMAGE_FORMAT_XBGR8888:
 860       return MESA_FORMAT_R8G8B8X8_UNORM;
 861    case __DRI_IMAGE_FORMAT_R8:
 862       return MESA_FORMAT_R_UNORM8;
 863    case __DRI_IMAGE_FORMAT_GR88:
 864       return MESA_FORMAT_R8G8_UNORM;
 865    case __DRI_IMAGE_FORMAT_SARGB8:
 866       return MESA_FORMAT_B8G8R8A8_SRGB;
 867    case __DRI_IMAGE_FORMAT_NONE:
 868       return MESA_FORMAT_NONE;
 869    default:
 870       return MESA_FORMAT_NONE;
 871    }
 872 }
 873
 874 /** Image driver interface */
 875 const __DRIimageDriverExtension driImageDriverExtension = {
 876     .base = { __DRI_IMAGE_DRIVER, 1 },
 877
 878     .createNewScreen2           = driCreateNewScreen2,
 879     .createNewDrawable          = driCreateNewDrawable,
 880     .getAPIMask                 = driGetAPIMask,
 881     .createContextAttribs       = driCreateContextAttribs,
 882 };
 883
 884 /* swrast copy sub buffer entrypoint. */
 885 static void driCopySubBuffer(__DRIdrawable *pdp, int x, int y,
 886                              int w, int h)
 887 {
 888     assert(pdp->driScreenPriv->swrast_loader);
 889
 890     pdp->driScreenPriv->driver->CopySubBuffer(pdp, x, y, w, h);
 891 }
 892
 893 /* for swrast only */
 894 const __DRIcopySubBufferExtension driCopySubBufferExtension = {
 895    .base = { __DRI_COPY_SUB_BUFFER, 1 },
 896
 897    .copySubBuffer               = driCopySubBuffer,
 898 };