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 #include "dri_util.h"
  44 #include "utils.h"
  45 #include "xmlpool.h"
  46 #include "main/mtypes.h"
  47 #include "main/framebuffer.h"
  48 #include "main/version.h"
  49 #include "main/debug_output.h"
  50 #include "main/errors.h"
  51 #include "main/macros.h"
  52
  53 const char __dri2ConfigOptions[] =
  54    DRI_CONF_BEGIN
  55       DRI_CONF_SECTION_PERFORMANCE
  56          DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_1)
  57       DRI_CONF_SECTION_END
  58    DRI_CONF_END;
  59
  60 /*****************************************************************/
  61 /** \name Screen handling functions                              */
  62 /*****************************************************************/
  63 /*@{*/
  64
  65 static void
  66 setupLoaderExtensions(__DRIscreen *psp,
  67                       const __DRIextension **extensions)
  68 {
  69     int i;
  70
  71     for (i = 0; extensions[i]; i++) {
  72         if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
  73             psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
  74         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)
  75             psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];
  76         if (strcmp(extensions[i]->name, __DRI_USE_INVALIDATE) == 0)
  77             psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];
  78         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
  79             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
  80         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOADER) == 0)
  81            psp->image.loader = (__DRIimageLoaderExtension *) extensions[i];
  82     }
  83 }
  84
  85 /**
  86  * This pointer determines which driver API we'll use in the case of the
  87  * loader not passing us an explicit driver extensions list (that would,
  88  * itself, contain a pointer to a driver API.)
  89  *
  90  * A driver's driDriverGetExtensions_drivername() can update this pointer to
  91  * what it's returning, and a loader that is ignorant of createNewScreen2()
  92  * will get the correct driver screen created, as long as no other
  93  * driDriverGetExtensions() happened in between the first one and the
  94  * createNewScreen().
  95  *
  96  * This allows the X Server to not require the significant dri_interface.h
  97  * updates for doing createNewScreen2(), which would discourage backporting of
  98  * the X Server patches to support the new loader interface.
  99  */
 100 const struct __DriverAPIRec *globalDriverAPI = &driDriverAPI;
 101
 102 /**
 103  * This is the first entrypoint in the driver called by the DRI driver loader
 104  * after dlopen()ing it.
 105  *
 106  * It's used to create global state for the driver across contexts on the same
 107  * Display.
 108  */
 109 static __DRIscreen *
 110 driCreateNewScreen2(int scrn, int fd,
 111                     const __DRIextension **extensions,
 112                     const __DRIextension **driver_extensions,
 113                     const __DRIconfig ***driver_configs, void *data)
 114 {
 115     static const __DRIextension *emptyExtensionList[] = { NULL };
 116     __DRIscreen *psp;
 117
 118     psp = calloc(1, sizeof(*psp));
 119     if (!psp)
 120         return NULL;
 121
 122     /* By default, use the global driDriverAPI symbol (non-megadrivers). */
 123     psp->driver = globalDriverAPI;
 124
 125     /* If the driver exposes its vtable through its extensions list
 126      * (megadrivers), use that instead.
 127      */
 128     if (driver_extensions) {
 129        for (int i = 0; driver_extensions[i]; i++) {
 130           if (strcmp(driver_extensions[i]->name, __DRI_DRIVER_VTABLE) == 0) {
 131              psp->driver =
 132                 ((__DRIDriverVtableExtension *)driver_extensions[i])->vtable;
 133           }
 134        }
 135     }
 136
 137     setupLoaderExtensions(psp, extensions);
 138
 139     psp->loaderPrivate = data;
 140
 141     psp->extensions = emptyExtensionList;
 142     psp->fd = fd;
 143     psp->myNum = scrn;
 144
 145     *driver_configs = psp->driver->InitScreen(psp);
 146     if (*driver_configs == NULL) {
 147         free(psp);
 148         return NULL;
 149     }
 150
 151     struct gl_constants consts = { 0 };
 152     gl_api api;
 153     unsigned version;
 154
 155     api = API_OPENGLES2;
 156     if (_mesa_override_gl_version_contextless(&consts, &api, &version))
 157        psp->max_gl_es2_version = version;
 158
 159     api = API_OPENGL_COMPAT;
 160     if (_mesa_override_gl_version_contextless(&consts, &api, &version)) {
 161        if (api == API_OPENGL_CORE) {
 162           psp->max_gl_core_version = version;
 163        } else {
 164           psp->max_gl_compat_version = version;
 165        }
 166     }
 167
 168     psp->api_mask = 0;
 169     if (psp->max_gl_compat_version > 0)
 170        psp->api_mask |= (1 << __DRI_API_OPENGL);
 171     if (psp->max_gl_core_version > 0)
 172        psp->api_mask |= (1 << __DRI_API_OPENGL_CORE);
 173     if (psp->max_gl_es1_version > 0)
 174        psp->api_mask |= (1 << __DRI_API_GLES);
 175     if (psp->max_gl_es2_version > 0)
 176        psp->api_mask |= (1 << __DRI_API_GLES2);
 177     if (psp->max_gl_es2_version >= 30)
 178        psp->api_mask |= (1 << __DRI_API_GLES3);
 179
 180     driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions);
 181     driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum, "dri2");
 182
 183
 184     return psp;
 185 }
 186
 187 static __DRIscreen *
 188 dri2CreateNewScreen(int scrn, int fd,
 189                     const __DRIextension **extensions,
 190                     const __DRIconfig ***driver_configs, void *data)
 191 {
 192    return driCreateNewScreen2(scrn, fd, extensions, NULL,
 193                                driver_configs, data);
 194 }
 195
 196 /** swrast driver createNewScreen entrypoint. */
 197 static __DRIscreen *
 198 driSWRastCreateNewScreen(int scrn, const __DRIextension **extensions,
 199                          const __DRIconfig ***driver_configs, void *data)
 200 {
 201    return driCreateNewScreen2(scrn, -1, extensions, NULL,
 202                                driver_configs, data);
 203 }
 204
 205 static __DRIscreen *
 206 driSWRastCreateNewScreen2(int scrn, const __DRIextension **extensions,
 207                           const __DRIextension **driver_extensions,
 208                           const __DRIconfig ***driver_configs, void *data)
 209 {
 210    return driCreateNewScreen2(scrn, -1, extensions, driver_extensions,
 211                                driver_configs, data);
 212 }
 213
 214 /**
 215  * Destroy the per-screen private information.
 216  *
 217  * \internal
 218  * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
 219  * drmClose(), and finally frees \p screenPrivate.
 220  */
 221 static void driDestroyScreen(__DRIscreen *psp)
 222 {
 223     if (psp) {
 224         /* No interaction with the X-server is possible at this point.  This
 225          * routine is called after XCloseDisplay, so there is no protocol
 226          * stream open to the X-server anymore.
 227          */
 228
 229         psp->driver->DestroyScreen(psp);
 230
 231         driDestroyOptionCache(&psp->optionCache);
 232         driDestroyOptionInfo(&psp->optionInfo);
 233
 234         free(psp);
 235     }
 236 }
 237
 238 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 239 {
 240     return psp->extensions;
 241 }
 242
 243 /*@}*/
 244
 245
 246 static bool
 247 validate_context_version(__DRIscreen *screen,
 248                          int mesa_api,
 249                          unsigned major_version,
 250                          unsigned minor_version,
 251                          unsigned *dri_ctx_error)
 252 {
 253    unsigned req_version = 10 * major_version + minor_version;
 254    unsigned max_version = 0;
 255
 256    switch (mesa_api) {
 257    case API_OPENGL_COMPAT:
 258       max_version = screen->max_gl_compat_version;
 259       break;
 260    case API_OPENGL_CORE:
 261       max_version = screen->max_gl_core_version;
 262       break;
 263    case API_OPENGLES:
 264       max_version = screen->max_gl_es1_version;
 265       break;
 266    case API_OPENGLES2:
 267       max_version = screen->max_gl_es2_version;
 268       break;
 269    default:
 270       max_version = 0;
 271       break;
 272    }
 273
 274    if (max_version == 0) {
 275       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
 276       return false;
 277    } else if (req_version > max_version) {
 278       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
 279       return false;
 280    }
 281
 282    return true;
 283 }
 284
 285 /*****************************************************************/
 286 /** \name Context handling functions                             */
 287 /*****************************************************************/
 288 /*@{*/
 289
 290 static __DRIcontext *
 291 driCreateContextAttribs(__DRIscreen *screen, int api,
 292                         const __DRIconfig *config,
 293                         __DRIcontext *shared,
 294                         unsigned num_attribs,
 295                         const uint32_t *attribs,
 296                         unsigned *error,
 297                         void *data)
 298 {
 299     __DRIcontext *context;
 300     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
 301     void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 302     gl_api mesa_api;
 303     unsigned major_version = 1;
 304     unsigned minor_version = 0;
 305     uint32_t flags = 0;
 306     bool notify_reset = false;
 307
 308     assert((num_attribs == 0) || (attribs != NULL));
 309
 310     if (!(screen->api_mask & (1 << api))) {
 311         *error = __DRI_CTX_ERROR_BAD_API;
 312         return NULL;
 313     }
 314
 315     switch (api) {
 316     case __DRI_API_OPENGL:
 317         mesa_api = API_OPENGL_COMPAT;
 318         break;
 319     case __DRI_API_GLES:
 320         mesa_api = API_OPENGLES;
 321         break;
 322     case __DRI_API_GLES2:
 323     case __DRI_API_GLES3:
 324         mesa_api = API_OPENGLES2;
 325         break;
 326     case __DRI_API_OPENGL_CORE:
 327         mesa_api = API_OPENGL_CORE;
 328         break;
 329     default:
 330         *error = __DRI_CTX_ERROR_BAD_API;
 331         return NULL;
 332     }
 333
 334     for (unsigned i = 0; i < num_attribs; i++) {
 335         switch (attribs[i * 2]) {
 336         case __DRI_CTX_ATTRIB_MAJOR_VERSION:
 337             major_version = attribs[i * 2 + 1];
 338             break;
 339         case __DRI_CTX_ATTRIB_MINOR_VERSION:
 340             minor_version = attribs[i * 2 + 1];
 341             break;
 342         case __DRI_CTX_ATTRIB_FLAGS:
 343             flags = attribs[i * 2 + 1];
 344             break;
 345         case __DRI_CTX_ATTRIB_RESET_STRATEGY:
 346             notify_reset = (attribs[i * 2 + 1]
 347                             != __DRI_CTX_RESET_NO_NOTIFICATION);
 348             break;
 349         default:
 350             /* We can't create a context that satisfies the requirements of an
 351              * attribute that we don't understand.  Return failure.
 352              */
 353             assert(!"Should not get here.");
 354             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 355             return NULL;
 356         }
 357     }
 358
 359     /* Mesa does not support the GL_ARB_compatibilty extension or the
 360      * compatibility profile.  This means that we treat a API_OPENGL_COMPAT 3.1 as
 361      * API_OPENGL_CORE and reject API_OPENGL_COMPAT 3.2+.
 362      */
 363     if (mesa_api == API_OPENGL_COMPAT && major_version == 3 && minor_version == 1)
 364        mesa_api = API_OPENGL_CORE;
 365
 366     if (mesa_api == API_OPENGL_COMPAT
 367         && ((major_version > 3)
 368             || (major_version == 3 && minor_version >= 2))) {
 369        *error = __DRI_CTX_ERROR_BAD_API;
 370        return NULL;
 371     }
 372
 373     /* The latest version of EGL_KHR_create_context spec says:
 374      *
 375      *     "If the EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR flag bit is set in
 376      *     EGL_CONTEXT_FLAGS_KHR, then a <debug context> will be created.
 377      *     [...] This bit is supported for OpenGL and OpenGL ES contexts.
 378      *
 379      * No other EGL_CONTEXT_OPENGL_*_BIT is legal for an ES context.
 380      *
 381      * However, Mesa's EGL layer translates the context attribute
 382      * EGL_CONTEXT_OPENGL_ROBUST_ACCESS into the context flag
 383      * __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS.  That attribute is legal for ES
 384      * (with EGL 1.5 or EGL_EXT_create_context_robustness) and GL (only with
 385      * EGL 1.5).
 386      *
 387      * From the EGL_EXT_create_context_robustness spec:
 388      *
 389      *     This extension is written against the OpenGL ES 2.0 Specification
 390      *     but can apply to OpenGL ES 1.1 and up.
 391      *
 392      * From the EGL 1.5 (2014.08.27) spec, p55:
 393      *
 394      *     If the EGL_CONTEXT_OPENGL_ROBUST_ACCESS attribute is set to
 395      *     EGL_TRUE, a context supporting robust buffer access will be created.
 396      *     OpenGL contexts must support the GL_ARB_robustness extension, or
 397      *     equivalent core API functional- ity. OpenGL ES contexts must support
 398      *     the GL_EXT_robustness extension, or equivalent core API
 399      *     functionality.
 400      */
 401     if (mesa_api != API_OPENGL_COMPAT
 402         && mesa_api != API_OPENGL_CORE
 403         && (flags & ~(__DRI_CTX_FLAG_DEBUG |
 404                       __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS))) {
 405         *error = __DRI_CTX_ERROR_BAD_FLAG;
 406         return NULL;
 407     }
 408
 409     /* There are no forward-compatible contexts before OpenGL 3.0.  The
 410      * GLX_ARB_create_context spec says:
 411      *
 412      *     "Forward-compatible contexts are defined only for OpenGL versions
 413      *     3.0 and later."
 414      *
 415      * Forward-looking contexts are supported by silently converting the
 416      * requested API to API_OPENGL_CORE.
 417      *
 418      * In Mesa, a debug context is the same as a regular context.
 419      */
 420     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
 421        mesa_api = API_OPENGL_CORE;
 422     }
 423
 424     const uint32_t allowed_flags = (__DRI_CTX_FLAG_DEBUG
 425                                     | __DRI_CTX_FLAG_FORWARD_COMPATIBLE
 426                                     | __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS);
 427     if (flags & ~allowed_flags) {
 428         *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
 429         return NULL;
 430     }
 431
 432     if (!validate_context_version(screen, mesa_api,
 433                                   major_version, minor_version, error))
 434        return NULL;
 435
 436     context = calloc(1, sizeof *context);
 437     if (!context) {
 438         *error = __DRI_CTX_ERROR_NO_MEMORY;
 439         return NULL;
 440     }
 441
 442     context->loaderPrivate = data;
 443
 444     context->driScreenPriv = screen;
 445     context->driDrawablePriv = NULL;
 446     context->driReadablePriv = NULL;
 447
 448     if (!screen->driver->CreateContext(mesa_api, modes, context,
 449                                        major_version, minor_version,
 450                                        flags, notify_reset, error, shareCtx)) {
 451         free(context);
 452         return NULL;
 453     }
 454
 455     *error = __DRI_CTX_ERROR_SUCCESS;
 456     return context;
 457 }
 458
 459 void
 460 driContextSetFlags(struct gl_context *ctx, uint32_t flags)
 461 {
 462     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0)
 463         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 464     if ((flags & __DRI_CTX_FLAG_DEBUG) != 0) {
 465        _mesa_set_debug_state_int(ctx, GL_DEBUG_OUTPUT, GL_TRUE);
 466         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 467     }
 468 }
 469
 470 static __DRIcontext *
 471 driCreateNewContextForAPI(__DRIscreen *screen, int api,
 472                           const __DRIconfig *config,
 473                           __DRIcontext *shared, void *data)
 474 {
 475     unsigned error;
 476
 477     return driCreateContextAttribs(screen, api, config, shared, 0, NULL,
 478                                    &error, data);
 479 }
 480
 481 static __DRIcontext *
 482 driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 483                     __DRIcontext *shared, void *data)
 484 {
 485     return driCreateNewContextForAPI(screen, __DRI_API_OPENGL,
 486                                      config, shared, data);
 487 }
 488
 489 /**
 490  * Destroy the per-context private information.
 491  *
 492  * \internal
 493  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
 494  * drmDestroyContext(), and finally frees \p contextPrivate.
 495  */
 496 static void
 497 driDestroyContext(__DRIcontext *pcp)
 498 {
 499     if (pcp) {
 500         pcp->driScreenPriv->driver->DestroyContext(pcp);
 501         free(pcp);
 502     }
 503 }
 504
 505 static int
 506 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
 507 {
 508     (void) dest;
 509     (void) src;
 510     (void) mask;
 511     return GL_FALSE;
 512 }
 513
 514 /*@}*/
 515
 516
 517 /*****************************************************************/
 518 /** \name Context (un)binding functions                          */
 519 /*****************************************************************/
 520 /*@{*/
 521
 522 static void dri_get_drawable(__DRIdrawable *pdp);
 523 static void dri_put_drawable(__DRIdrawable *pdp);
 524
 525 /**
 526  * This function takes both a read buffer and a draw buffer.  This is needed
 527  * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
 528  * function.
 529  */
 530 static int driBindContext(__DRIcontext *pcp,
 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)
 540         return GL_FALSE;
 541
 542     /* Bind the drawable to the context */
 543     pcp->driDrawablePriv = pdp;
 544     pcp->driReadablePriv = prp;
 545     if (pdp) {
 546         pdp->driContextPriv = pcp;
 547         dri_get_drawable(pdp);
 548     }
 549     if (prp && pdp != prp) {
 550         dri_get_drawable(prp);
 551     }
 552
 553     return pcp->driScreenPriv->driver->MakeCurrent(pcp, pdp, prp);
 554 }
 555
 556 /**
 557  * Unbind context.
 558  *
 559  * \param scrn the screen.
 560  * \param gc context.
 561  *
 562  * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
 563  *
 564  * \internal
 565  * This function calls __DriverAPIRec::UnbindContext, and then decrements
 566  * __DRIdrawableRec::refcount which must be non-zero for a successful
 567  * return.
 568  *
 569  * While casting the opaque private pointers associated with the parameters
 570  * into their respective real types it also assures they are not \c NULL.
 571  */
 572 static int driUnbindContext(__DRIcontext *pcp)
 573 {
 574     __DRIdrawable *pdp;
 575     __DRIdrawable *prp;
 576
 577     /*
 578     ** Assume error checking is done properly in glXMakeCurrent before
 579     ** calling driUnbindContext.
 580     */
 581
 582     if (pcp == NULL)
 583         return GL_FALSE;
 584
 585     /*
 586     ** Call driUnbindContext before checking for valid drawables
 587     ** to handle surfaceless contexts properly.
 588     */
 589     pcp->driScreenPriv->driver->UnbindContext(pcp);
 590
 591     pdp = pcp->driDrawablePriv;
 592     prp = pcp->driReadablePriv;
 593
 594     /* already unbound */
 595     if (!pdp && !prp)
 596         return GL_TRUE;
 597
 598     assert(pdp);
 599     if (pdp->refcount == 0) {
 600         /* ERROR!!! */
 601         return GL_FALSE;
 602     }
 603
 604     dri_put_drawable(pdp);
 605
 606     if (prp != pdp) {
 607         if (prp->refcount == 0) {
 608             /* ERROR!!! */
 609             return GL_FALSE;
 610         }
 611
 612         dri_put_drawable(prp);
 613     }
 614
 615     pcp->driDrawablePriv = NULL;
 616     pcp->driReadablePriv = NULL;
 617
 618     return GL_TRUE;
 619 }
 620
 621 /*@}*/
 622
 623
 624 static void dri_get_drawable(__DRIdrawable *pdp)
 625 {
 626     pdp->refcount++;
 627 }
 628
 629 static void dri_put_drawable(__DRIdrawable *pdp)
 630 {
 631     if (pdp) {
 632         pdp->refcount--;
 633         if (pdp->refcount)
 634             return;
 635
 636         pdp->driScreenPriv->driver->DestroyBuffer(pdp);
 637         free(pdp);
 638     }
 639 }
 640
 641 static __DRIdrawable *
 642 driCreateNewDrawable(__DRIscreen *screen,
 643                      const __DRIconfig *config,
 644                      void *data)
 645 {
 646     __DRIdrawable *pdraw;
 647
 648     pdraw = malloc(sizeof *pdraw);
 649     if (!pdraw)
 650         return NULL;
 651
 652     pdraw->loaderPrivate = data;
 653
 654     pdraw->driScreenPriv = screen;
 655     pdraw->driContextPriv = NULL;
 656     pdraw->refcount = 0;
 657     pdraw->lastStamp = 0;
 658     pdraw->w = 0;
 659     pdraw->h = 0;
 660
 661     dri_get_drawable(pdraw);
 662
 663     if (!screen->driver->CreateBuffer(screen, pdraw, &config->modes,
 664                                       GL_FALSE)) {
 665        free(pdraw);
 666        return NULL;
 667     }
 668
 669     pdraw->dri2.stamp = pdraw->lastStamp + 1;
 670
 671     return pdraw;
 672 }
 673
 674 static void
 675 driDestroyDrawable(__DRIdrawable *pdp)
 676 {
 677     dri_put_drawable(pdp);
 678 }
 679
 680 static __DRIbuffer *
 681 dri2AllocateBuffer(__DRIscreen *screen,
 682                    unsigned int attachment, unsigned int format,
 683                    int width, int height)
 684 {
 685     return screen->driver->AllocateBuffer(screen, attachment, format,
 686                                           width, height);
 687 }
 688
 689 static void
 690 dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 691 {
 692     screen->driver->ReleaseBuffer(screen, buffer);
 693 }
 694
 695
 696 static int
 697 dri2ConfigQueryb(__DRIscreen *screen, const char *var, unsigned char *val)
 698 {
 699    if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
 700       return -1;
 701
 702    *val = driQueryOptionb(&screen->optionCache, var);
 703
 704    return 0;
 705 }
 706
 707 static int
 708 dri2ConfigQueryi(__DRIscreen *screen, const char *var, int *val)
 709 {
 710    if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
 711        !driCheckOption(&screen->optionCache, var, DRI_ENUM))
 712       return -1;
 713
 714     *val = driQueryOptioni(&screen->optionCache, var);
 715
 716     return 0;
 717 }
 718
 719 static int
 720 dri2ConfigQueryf(__DRIscreen *screen, const char *var, float *val)
 721 {
 722    if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
 723       return -1;
 724
 725     *val = driQueryOptionf(&screen->optionCache, var);
 726
 727     return 0;
 728 }
 729
 730 static unsigned int
 731 driGetAPIMask(__DRIscreen *screen)
 732 {
 733     return screen->api_mask;
 734 }
 735
 736 /**
 737  * swrast swapbuffers entrypoint.
 738  *
 739  * DRI2 implements this inside the loader with only flushes handled by the
 740  * driver.
 741  */
 742 static void
 743 driSwapBuffers(__DRIdrawable *pdp)
 744 {
 745     assert(pdp->driScreenPriv->swrast_loader);
 746
 747     pdp->driScreenPriv->driver->SwapBuffers(pdp);
 748 }
 749
 750 /** Core interface */
 751 const __DRIcoreExtension driCoreExtension = {
 752     .base = { __DRI_CORE, 1 },
 753
 754     .createNewScreen            = NULL,
 755     .destroyScreen              = driDestroyScreen,
 756     .getExtensions              = driGetExtensions,
 757     .getConfigAttrib            = driGetConfigAttrib,
 758     .indexConfigAttrib          = driIndexConfigAttrib,
 759     .createNewDrawable          = NULL,
 760     .destroyDrawable            = driDestroyDrawable,
 761     .swapBuffers                = driSwapBuffers, /* swrast */
 762     .createNewContext           = driCreateNewContext, /* swrast */
 763     .copyContext                = driCopyContext,
 764     .destroyContext             = driDestroyContext,
 765     .bindContext                = driBindContext,
 766     .unbindContext              = driUnbindContext
 767 };
 768
 769 /** DRI2 interface */
 770 const __DRIdri2Extension driDRI2Extension = {
 771     .base = { __DRI_DRI2, 4 },
 772
 773     .createNewScreen            = dri2CreateNewScreen,
 774     .createNewDrawable          = driCreateNewDrawable,
 775     .createNewContext           = driCreateNewContext,
 776     .getAPIMask                 = driGetAPIMask,
 777     .createNewContextForAPI     = driCreateNewContextForAPI,
 778     .allocateBuffer             = dri2AllocateBuffer,
 779     .releaseBuffer              = dri2ReleaseBuffer,
 780     .createContextAttribs       = driCreateContextAttribs,
 781     .createNewScreen2           = driCreateNewScreen2,
 782 };
 783
 784 const __DRIswrastExtension driSWRastExtension = {
 785     .base = { __DRI_SWRAST, 4 },
 786
 787     .createNewScreen            = driSWRastCreateNewScreen,
 788     .createNewDrawable          = driCreateNewDrawable,
 789     .createNewContextForAPI     = driCreateNewContextForAPI,
 790     .createContextAttribs       = driCreateContextAttribs,
 791     .createNewScreen2           = driSWRastCreateNewScreen2,
 792 };
 793
 794 const __DRI2configQueryExtension dri2ConfigQueryExtension = {
 795    .base = { __DRI2_CONFIG_QUERY, 1 },
 796
 797    .configQueryb        = dri2ConfigQueryb,
 798    .configQueryi        = dri2ConfigQueryi,
 799    .configQueryf        = dri2ConfigQueryf,
 800 };
 801
 802 void
 803 dri2InvalidateDrawable(__DRIdrawable *drawable)
 804 {
 805     drawable->dri2.stamp++;
 806 }
 807
 808 /**
 809  * Check that the gl_framebuffer associated with dPriv is the right size.
 810  * Resize the gl_framebuffer if needed.
 811  * It's expected that the dPriv->driverPrivate member points to a
 812  * gl_framebuffer object.
 813  */
 814 void
 815 driUpdateFramebufferSize(struct gl_context *ctx, const __DRIdrawable *dPriv)
 816 {
 817    struct gl_framebuffer *fb = (struct gl_framebuffer *) dPriv->driverPrivate;
 818    if (fb && (dPriv->w != fb->Width || dPriv->h != fb->Height)) {
 819       _mesa_resize_framebuffer(ctx, fb, dPriv->w, dPriv->h);
 820       /* if the driver needs the hw lock for ResizeBuffers, the drawable
 821          might have changed again by now */
 822       assert(fb->Width == dPriv->w);
 823       assert(fb->Height == dPriv->h);
 824    }
 825 }
 826
 827 uint32_t
 828 driGLFormatToImageFormat(mesa_format format)
 829 {
 830    switch (format) {
 831    case MESA_FORMAT_B5G6R5_UNORM:
 832       return __DRI_IMAGE_FORMAT_RGB565;
 833    case MESA_FORMAT_B5G5R5A1_UNORM:
 834       return __DRI_IMAGE_FORMAT_ARGB1555;
 835    case MESA_FORMAT_B8G8R8X8_UNORM:
 836       return __DRI_IMAGE_FORMAT_XRGB8888;
 837    case MESA_FORMAT_B10G10R10A2_UNORM:
 838       return __DRI_IMAGE_FORMAT_ARGB2101010;
 839    case MESA_FORMAT_B10G10R10X2_UNORM:
 840       return __DRI_IMAGE_FORMAT_XRGB2101010;
 841    case MESA_FORMAT_B8G8R8A8_UNORM:
 842       return __DRI_IMAGE_FORMAT_ARGB8888;
 843    case MESA_FORMAT_R8G8B8A8_UNORM:
 844       return __DRI_IMAGE_FORMAT_ABGR8888;
 845    case MESA_FORMAT_R8G8B8X8_UNORM:
 846       return __DRI_IMAGE_FORMAT_XBGR8888;
 847    case MESA_FORMAT_L_UNORM8:
 848    case MESA_FORMAT_R_UNORM8:
 849       return __DRI_IMAGE_FORMAT_R8;
 850    case MESA_FORMAT_L8A8_UNORM:
 851    case MESA_FORMAT_R8G8_UNORM:
 852       return __DRI_IMAGE_FORMAT_GR88;
 853    case MESA_FORMAT_NONE:
 854       return __DRI_IMAGE_FORMAT_NONE;
 855    case MESA_FORMAT_B8G8R8A8_SRGB:
 856       return __DRI_IMAGE_FORMAT_SARGB8;
 857    default:
 858       return 0;
 859    }
 860 }
 861
 862 mesa_format
 863 driImageFormatToGLFormat(uint32_t image_format)
 864 {
 865    switch (image_format) {
 866    case __DRI_IMAGE_FORMAT_RGB565:
 867       return MESA_FORMAT_B5G6R5_UNORM;
 868    case __DRI_IMAGE_FORMAT_ARGB1555:
 869       return MESA_FORMAT_B5G5R5A1_UNORM;
 870    case __DRI_IMAGE_FORMAT_XRGB8888:
 871       return MESA_FORMAT_B8G8R8X8_UNORM;
 872    case __DRI_IMAGE_FORMAT_ARGB2101010:
 873       return MESA_FORMAT_B10G10R10A2_UNORM;
 874    case __DRI_IMAGE_FORMAT_XRGB2101010:
 875       return MESA_FORMAT_B10G10R10X2_UNORM;
 876    case __DRI_IMAGE_FORMAT_ARGB8888:
 877       return MESA_FORMAT_B8G8R8A8_UNORM;
 878    case __DRI_IMAGE_FORMAT_ABGR8888:
 879       return MESA_FORMAT_R8G8B8A8_UNORM;
 880    case __DRI_IMAGE_FORMAT_XBGR8888:
 881       return MESA_FORMAT_R8G8B8X8_UNORM;
 882    case __DRI_IMAGE_FORMAT_R8:
 883       return MESA_FORMAT_R_UNORM8;
 884    case __DRI_IMAGE_FORMAT_R16:
 885       return MESA_FORMAT_R_UNORM16;
 886    case __DRI_IMAGE_FORMAT_GR88:
 887       return MESA_FORMAT_R8G8_UNORM;
 888    case __DRI_IMAGE_FORMAT_GR1616:
 889       return MESA_FORMAT_R16G16_UNORM;
 890    case __DRI_IMAGE_FORMAT_SARGB8:
 891       return MESA_FORMAT_B8G8R8A8_SRGB;
 892    case __DRI_IMAGE_FORMAT_NONE:
 893       return MESA_FORMAT_NONE;
 894    default:
 895       return MESA_FORMAT_NONE;
 896    }
 897 }
 898
 899 /** Image driver interface */
 900 const __DRIimageDriverExtension driImageDriverExtension = {
 901     .base = { __DRI_IMAGE_DRIVER, 1 },
 902
 903     .createNewScreen2           = driCreateNewScreen2,
 904     .createNewDrawable          = driCreateNewDrawable,
 905     .getAPIMask                 = driGetAPIMask,
 906     .createContextAttribs       = driCreateContextAttribs,
 907 };
 908
 909 /* swrast copy sub buffer entrypoint. */
 910 static void driCopySubBuffer(__DRIdrawable *pdp, int x, int y,
 911                              int w, int h)
 912 {
 913     assert(pdp->driScreenPriv->swrast_loader);
 914
 915     pdp->driScreenPriv->driver->CopySubBuffer(pdp, x, y, w, h);
 916 }
 917
 918 /* for swrast only */
 919 const __DRIcopySubBufferExtension driCopySubBufferExtension = {
 920    .base = { __DRI_COPY_SUB_BUFFER, 1 },
 921
 922    .copySubBuffer               = driCopySubBuffer,
 923 };