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 "util/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_BACKGROUND_CALLABLE) == 0)
  79             psp->dri2.backgroundCallable = (__DRIbackgroundCallableExtension *) 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     psp->loaderPrivate = data;
 142
 143     psp->extensions = emptyExtensionList;
 144     psp->fd = fd;
 145     psp->myNum = scrn;
 146
 147     *driver_configs = psp->driver->InitScreen(psp);
 148     if (*driver_configs == NULL) {
 149         free(psp);
 150         return NULL;
 151     }
 152
 153     struct gl_constants consts = { 0 };
 154     gl_api api;
 155     unsigned version;
 156
 157     api = API_OPENGLES2;
 158     if (_mesa_override_gl_version_contextless(&consts, &api, &version))
 159        psp->max_gl_es2_version = version;
 160
 161     api = API_OPENGL_COMPAT;
 162     if (_mesa_override_gl_version_contextless(&consts, &api, &version)) {
 163        if (api == API_OPENGL_CORE) {
 164           psp->max_gl_core_version = version;
 165        } else {
 166           psp->max_gl_compat_version = version;
 167        }
 168     }
 169
 170     psp->api_mask = 0;
 171     if (psp->max_gl_compat_version > 0)
 172        psp->api_mask |= (1 << __DRI_API_OPENGL);
 173     if (psp->max_gl_core_version > 0)
 174        psp->api_mask |= (1 << __DRI_API_OPENGL_CORE);
 175     if (psp->max_gl_es1_version > 0)
 176        psp->api_mask |= (1 << __DRI_API_GLES);
 177     if (psp->max_gl_es2_version > 0)
 178        psp->api_mask |= (1 << __DRI_API_GLES2);
 179     if (psp->max_gl_es2_version >= 30)
 180        psp->api_mask |= (1 << __DRI_API_GLES3);
 181
 182     driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions);
 183     driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum, "dri2");
 184
 185
 186     return psp;
 187 }
 188
 189 static __DRIscreen *
 190 dri2CreateNewScreen(int scrn, int fd,
 191                     const __DRIextension **extensions,
 192                     const __DRIconfig ***driver_configs, void *data)
 193 {
 194    return driCreateNewScreen2(scrn, fd, extensions, NULL,
 195                                driver_configs, data);
 196 }
 197
 198 /** swrast driver createNewScreen entrypoint. */
 199 static __DRIscreen *
 200 driSWRastCreateNewScreen(int scrn, const __DRIextension **extensions,
 201                          const __DRIconfig ***driver_configs, void *data)
 202 {
 203    return driCreateNewScreen2(scrn, -1, extensions, NULL,
 204                                driver_configs, data);
 205 }
 206
 207 static __DRIscreen *
 208 driSWRastCreateNewScreen2(int scrn, const __DRIextension **extensions,
 209                           const __DRIextension **driver_extensions,
 210                           const __DRIconfig ***driver_configs, void *data)
 211 {
 212    return driCreateNewScreen2(scrn, -1, extensions, driver_extensions,
 213                                driver_configs, data);
 214 }
 215
 216 /**
 217  * Destroy the per-screen private information.
 218  *
 219  * \internal
 220  * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
 221  * drmClose(), and finally frees \p screenPrivate.
 222  */
 223 static void driDestroyScreen(__DRIscreen *psp)
 224 {
 225     if (psp) {
 226         /* No interaction with the X-server is possible at this point.  This
 227          * routine is called after XCloseDisplay, so there is no protocol
 228          * stream open to the X-server anymore.
 229          */
 230
 231         psp->driver->DestroyScreen(psp);
 232
 233         driDestroyOptionCache(&psp->optionCache);
 234         driDestroyOptionInfo(&psp->optionInfo);
 235
 236         free(psp);
 237     }
 238 }
 239
 240 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 241 {
 242     return psp->extensions;
 243 }
 244
 245 /*@}*/
 246
 247
 248 static bool
 249 validate_context_version(__DRIscreen *screen,
 250                          int mesa_api,
 251                          unsigned major_version,
 252                          unsigned minor_version,
 253                          unsigned *dri_ctx_error)
 254 {
 255    unsigned req_version = 10 * major_version + minor_version;
 256    unsigned max_version = 0;
 257
 258    switch (mesa_api) {
 259    case API_OPENGL_COMPAT:
 260       max_version = screen->max_gl_compat_version;
 261       break;
 262    case API_OPENGL_CORE:
 263       max_version = screen->max_gl_core_version;
 264       break;
 265    case API_OPENGLES:
 266       max_version = screen->max_gl_es1_version;
 267       break;
 268    case API_OPENGLES2:
 269       max_version = screen->max_gl_es2_version;
 270       break;
 271    default:
 272       max_version = 0;
 273       break;
 274    }
 275
 276    if (max_version == 0) {
 277       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
 278       return false;
 279    } else if (req_version > max_version) {
 280       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
 281       return false;
 282    }
 283
 284    return true;
 285 }
 286
 287 /*****************************************************************/
 288 /** \name Context handling functions                             */
 289 /*****************************************************************/
 290 /*@{*/
 291
 292 static __DRIcontext *
 293 driCreateContextAttribs(__DRIscreen *screen, int api,
 294                         const __DRIconfig *config,
 295                         __DRIcontext *shared,
 296                         unsigned num_attribs,
 297                         const uint32_t *attribs,
 298                         unsigned *error,
 299                         void *data)
 300 {
 301     __DRIcontext *context;
 302     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
 303     void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 304     gl_api mesa_api;
 305     struct __DriverContextConfig ctx_config;
 306
 307     ctx_config.major_version = 1;
 308     ctx_config.minor_version = 0;
 309     ctx_config.flags = 0;
 310     ctx_config.attribute_mask = 0;
 311     ctx_config.priority = __DRI_CTX_PRIORITY_MEDIUM;
 312
 313     assert((num_attribs == 0) || (attribs != NULL));
 314
 315     if (!(screen->api_mask & (1 << api))) {
 316         *error = __DRI_CTX_ERROR_BAD_API;
 317         return NULL;
 318     }
 319
 320     switch (api) {
 321     case __DRI_API_OPENGL:
 322         mesa_api = API_OPENGL_COMPAT;
 323         break;
 324     case __DRI_API_GLES:
 325         mesa_api = API_OPENGLES;
 326         break;
 327     case __DRI_API_GLES2:
 328     case __DRI_API_GLES3:
 329         mesa_api = API_OPENGLES2;
 330         break;
 331     case __DRI_API_OPENGL_CORE:
 332         mesa_api = API_OPENGL_CORE;
 333         break;
 334     default:
 335         *error = __DRI_CTX_ERROR_BAD_API;
 336         return NULL;
 337     }
 338
 339     for (unsigned i = 0; i < num_attribs; i++) {
 340         switch (attribs[i * 2]) {
 341         case __DRI_CTX_ATTRIB_MAJOR_VERSION:
 342             ctx_config.major_version = attribs[i * 2 + 1];
 343             break;
 344         case __DRI_CTX_ATTRIB_MINOR_VERSION:
 345             ctx_config.minor_version = attribs[i * 2 + 1];
 346             break;
 347         case __DRI_CTX_ATTRIB_FLAGS:
 348             ctx_config.flags = attribs[i * 2 + 1];
 349             break;
 350         case __DRI_CTX_ATTRIB_RESET_STRATEGY:
 351             if (attribs[i * 2 + 1] != __DRI_CTX_RESET_NO_NOTIFICATION) {
 352                 ctx_config.attribute_mask |=
 353                     __DRIVER_CONTEXT_ATTRIB_RESET_STRATEGY;
 354                 ctx_config.reset_strategy = attribs[i * 2 + 1];
 355             } else {
 356                 ctx_config.attribute_mask &=
 357                     ~__DRIVER_CONTEXT_ATTRIB_RESET_STRATEGY;
 358             }
 359             break;
 360         case __DRI_CTX_ATTRIB_PRIORITY:
 361             ctx_config.attribute_mask |= __DRIVER_CONTEXT_ATTRIB_PRIORITY;
 362             ctx_config.priority = attribs[i * 2 + 1];
 363             break;
 364         default:
 365             /* We can't create a context that satisfies the requirements of an
 366              * attribute that we don't understand.  Return failure.
 367              */
 368             assert(!"Should not get here.");
 369             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 370             return NULL;
 371         }
 372     }
 373
 374     /* Mesa does not support the GL_ARB_compatibilty extension or the
 375      * compatibility profile.  This means that we treat a API_OPENGL_COMPAT 3.1 as
 376      * API_OPENGL_CORE and reject API_OPENGL_COMPAT 3.2+.
 377      */
 378     if (mesa_api == API_OPENGL_COMPAT &&
 379         ctx_config.major_version == 3 && ctx_config.minor_version == 1)
 380        mesa_api = API_OPENGL_CORE;
 381
 382     if (mesa_api == API_OPENGL_COMPAT
 383         && ((ctx_config.major_version > 3)
 384             || (ctx_config.major_version == 3 &&
 385                 ctx_config.minor_version >= 2))) {
 386        *error = __DRI_CTX_ERROR_BAD_API;
 387        return NULL;
 388     }
 389
 390     /* The latest version of EGL_KHR_create_context spec says:
 391      *
 392      *     "If the EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR flag bit is set in
 393      *     EGL_CONTEXT_FLAGS_KHR, then a <debug context> will be created.
 394      *     [...] This bit is supported for OpenGL and OpenGL ES contexts.
 395      *
 396      * No other EGL_CONTEXT_OPENGL_*_BIT is legal for an ES context.
 397      *
 398      * However, Mesa's EGL layer translates the context attribute
 399      * EGL_CONTEXT_OPENGL_ROBUST_ACCESS into the context flag
 400      * __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS.  That attribute is legal for ES
 401      * (with EGL 1.5 or EGL_EXT_create_context_robustness) and GL (only with
 402      * EGL 1.5).
 403      *
 404      * From the EGL_EXT_create_context_robustness spec:
 405      *
 406      *     This extension is written against the OpenGL ES 2.0 Specification
 407      *     but can apply to OpenGL ES 1.1 and up.
 408      *
 409      * From the EGL 1.5 (2014.08.27) spec, p55:
 410      *
 411      *     If the EGL_CONTEXT_OPENGL_ROBUST_ACCESS attribute is set to
 412      *     EGL_TRUE, a context supporting robust buffer access will be created.
 413      *     OpenGL contexts must support the GL_ARB_robustness extension, or
 414      *     equivalent core API functional- ity. OpenGL ES contexts must support
 415      *     the GL_EXT_robustness extension, or equivalent core API
 416      *     functionality.
 417      */
 418     if (mesa_api != API_OPENGL_COMPAT
 419         && mesa_api != API_OPENGL_CORE
 420         && (ctx_config.flags & ~(__DRI_CTX_FLAG_DEBUG |
 421                                  __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS |
 422                                  __DRI_CTX_FLAG_NO_ERROR))) {
 423         *error = __DRI_CTX_ERROR_BAD_FLAG;
 424         return NULL;
 425     }
 426
 427     /* There are no forward-compatible contexts before OpenGL 3.0.  The
 428      * GLX_ARB_create_context spec says:
 429      *
 430      *     "Forward-compatible contexts are defined only for OpenGL versions
 431      *     3.0 and later."
 432      *
 433      * Forward-looking contexts are supported by silently converting the
 434      * requested API to API_OPENGL_CORE.
 435      *
 436      * In Mesa, a debug context is the same as a regular context.
 437      */
 438     if ((ctx_config.flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
 439        mesa_api = API_OPENGL_CORE;
 440     }
 441
 442     const uint32_t allowed_flags = (__DRI_CTX_FLAG_DEBUG
 443                                     | __DRI_CTX_FLAG_FORWARD_COMPATIBLE
 444                                     | __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS
 445                                     | __DRI_CTX_FLAG_NO_ERROR);
 446     if (ctx_config.flags & ~allowed_flags) {
 447         *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
 448         return NULL;
 449     }
 450
 451     if (!validate_context_version(screen, mesa_api,
 452                                   ctx_config.major_version,
 453                                   ctx_config.minor_version,
 454                                   error))
 455        return NULL;
 456
 457     context = calloc(1, sizeof *context);
 458     if (!context) {
 459         *error = __DRI_CTX_ERROR_NO_MEMORY;
 460         return NULL;
 461     }
 462
 463     context->loaderPrivate = data;
 464
 465     context->driScreenPriv = screen;
 466     context->driDrawablePriv = NULL;
 467     context->driReadablePriv = NULL;
 468
 469     if (!screen->driver->CreateContext(mesa_api, modes, context,
 470                                        &ctx_config, error, shareCtx)) {
 471         free(context);
 472         return NULL;
 473     }
 474
 475     *error = __DRI_CTX_ERROR_SUCCESS;
 476     return context;
 477 }
 478
 479 void
 480 driContextSetFlags(struct gl_context *ctx, uint32_t flags)
 481 {
 482     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0)
 483         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 484     if ((flags & __DRI_CTX_FLAG_DEBUG) != 0) {
 485        _mesa_set_debug_state_int(ctx, GL_DEBUG_OUTPUT, GL_TRUE);
 486         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 487     }
 488     if ((flags & __DRI_CTX_FLAG_NO_ERROR) != 0)
 489         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR;
 490 }
 491
 492 static __DRIcontext *
 493 driCreateNewContextForAPI(__DRIscreen *screen, int api,
 494                           const __DRIconfig *config,
 495                           __DRIcontext *shared, void *data)
 496 {
 497     unsigned error;
 498
 499     return driCreateContextAttribs(screen, api, config, shared, 0, NULL,
 500                                    &error, data);
 501 }
 502
 503 static __DRIcontext *
 504 driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 505                     __DRIcontext *shared, void *data)
 506 {
 507     return driCreateNewContextForAPI(screen, __DRI_API_OPENGL,
 508                                      config, shared, data);
 509 }
 510
 511 /**
 512  * Destroy the per-context private information.
 513  *
 514  * \internal
 515  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
 516  * drmDestroyContext(), and finally frees \p contextPrivate.
 517  */
 518 static void
 519 driDestroyContext(__DRIcontext *pcp)
 520 {
 521     if (pcp) {
 522         pcp->driScreenPriv->driver->DestroyContext(pcp);
 523         free(pcp);
 524     }
 525 }
 526
 527 static int
 528 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
 529 {
 530     (void) dest;
 531     (void) src;
 532     (void) mask;
 533     return GL_FALSE;
 534 }
 535
 536 /*@}*/
 537
 538
 539 /*****************************************************************/
 540 /** \name Context (un)binding functions                          */
 541 /*****************************************************************/
 542 /*@{*/
 543
 544 static void dri_get_drawable(__DRIdrawable *pdp);
 545 static void dri_put_drawable(__DRIdrawable *pdp);
 546
 547 /**
 548  * This function takes both a read buffer and a draw buffer.  This is needed
 549  * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
 550  * function.
 551  */
 552 static int driBindContext(__DRIcontext *pcp,
 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)
 562         return GL_FALSE;
 563
 564     /* Bind the drawable to the context */
 565     pcp->driDrawablePriv = pdp;
 566     pcp->driReadablePriv = prp;
 567     if (pdp) {
 568         pdp->driContextPriv = pcp;
 569         dri_get_drawable(pdp);
 570     }
 571     if (prp && pdp != prp) {
 572         dri_get_drawable(prp);
 573     }
 574
 575     return pcp->driScreenPriv->driver->MakeCurrent(pcp, pdp, prp);
 576 }
 577
 578 /**
 579  * Unbind context.
 580  *
 581  * \param scrn the screen.
 582  * \param gc context.
 583  *
 584  * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
 585  *
 586  * \internal
 587  * This function calls __DriverAPIRec::UnbindContext, and then decrements
 588  * __DRIdrawableRec::refcount which must be non-zero for a successful
 589  * return.
 590  *
 591  * While casting the opaque private pointers associated with the parameters
 592  * into their respective real types it also assures they are not \c NULL.
 593  */
 594 static int driUnbindContext(__DRIcontext *pcp)
 595 {
 596     __DRIdrawable *pdp;
 597     __DRIdrawable *prp;
 598
 599     /*
 600     ** Assume error checking is done properly in glXMakeCurrent before
 601     ** calling driUnbindContext.
 602     */
 603
 604     if (pcp == NULL)
 605         return GL_FALSE;
 606
 607     /*
 608     ** Call driUnbindContext before checking for valid drawables
 609     ** to handle surfaceless contexts properly.
 610     */
 611     pcp->driScreenPriv->driver->UnbindContext(pcp);
 612
 613     pdp = pcp->driDrawablePriv;
 614     prp = pcp->driReadablePriv;
 615
 616     /* already unbound */
 617     if (!pdp && !prp)
 618         return GL_TRUE;
 619
 620     assert(pdp);
 621     if (pdp->refcount == 0) {
 622         /* ERROR!!! */
 623         return GL_FALSE;
 624     }
 625
 626     dri_put_drawable(pdp);
 627
 628     if (prp != pdp) {
 629         if (prp->refcount == 0) {
 630             /* ERROR!!! */
 631             return GL_FALSE;
 632         }
 633
 634         dri_put_drawable(prp);
 635     }
 636
 637     pcp->driDrawablePriv = NULL;
 638     pcp->driReadablePriv = NULL;
 639
 640     return GL_TRUE;
 641 }
 642
 643 /*@}*/
 644
 645
 646 static void dri_get_drawable(__DRIdrawable *pdp)
 647 {
 648     pdp->refcount++;
 649 }
 650
 651 static void dri_put_drawable(__DRIdrawable *pdp)
 652 {
 653     if (pdp) {
 654         pdp->refcount--;
 655         if (pdp->refcount)
 656             return;
 657
 658         pdp->driScreenPriv->driver->DestroyBuffer(pdp);
 659         free(pdp);
 660     }
 661 }
 662
 663 static __DRIdrawable *
 664 driCreateNewDrawable(__DRIscreen *screen,
 665                      const __DRIconfig *config,
 666                      void *data)
 667 {
 668     __DRIdrawable *pdraw;
 669
 670     assert(data != NULL);
 671
 672     pdraw = malloc(sizeof *pdraw);
 673     if (!pdraw)
 674         return NULL;
 675
 676     pdraw->loaderPrivate = data;
 677
 678     pdraw->driScreenPriv = screen;
 679     pdraw->driContextPriv = NULL;
 680     pdraw->refcount = 0;
 681     pdraw->lastStamp = 0;
 682     pdraw->w = 0;
 683     pdraw->h = 0;
 684
 685     dri_get_drawable(pdraw);
 686
 687     if (!screen->driver->CreateBuffer(screen, pdraw, &config->modes,
 688                                       GL_FALSE)) {
 689        free(pdraw);
 690        return NULL;
 691     }
 692
 693     pdraw->dri2.stamp = pdraw->lastStamp + 1;
 694
 695     return pdraw;
 696 }
 697
 698 static void
 699 driDestroyDrawable(__DRIdrawable *pdp)
 700 {
 701     /*
 702      * The loader's data structures are going away, even if pdp itself stays
 703      * around for the time being because it is currently bound. This happens
 704      * when a currently bound GLX pixmap is destroyed.
 705      *
 706      * Clear out the pointer back into the loader's data structures to avoid
 707      * accessing an outdated pointer.
 708      */
 709     pdp->loaderPrivate = NULL;
 710
 711     dri_put_drawable(pdp);
 712 }
 713
 714 static __DRIbuffer *
 715 dri2AllocateBuffer(__DRIscreen *screen,
 716                    unsigned int attachment, unsigned int format,
 717                    int width, int height)
 718 {
 719     return screen->driver->AllocateBuffer(screen, attachment, format,
 720                                           width, height);
 721 }
 722
 723 static void
 724 dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 725 {
 726     screen->driver->ReleaseBuffer(screen, buffer);
 727 }
 728
 729
 730 static int
 731 dri2ConfigQueryb(__DRIscreen *screen, const char *var, unsigned char *val)
 732 {
 733    if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
 734       return -1;
 735
 736    *val = driQueryOptionb(&screen->optionCache, var);
 737
 738    return 0;
 739 }
 740
 741 static int
 742 dri2ConfigQueryi(__DRIscreen *screen, const char *var, int *val)
 743 {
 744    if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
 745        !driCheckOption(&screen->optionCache, var, DRI_ENUM))
 746       return -1;
 747
 748     *val = driQueryOptioni(&screen->optionCache, var);
 749
 750     return 0;
 751 }
 752
 753 static int
 754 dri2ConfigQueryf(__DRIscreen *screen, const char *var, float *val)
 755 {
 756    if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
 757       return -1;
 758
 759     *val = driQueryOptionf(&screen->optionCache, var);
 760
 761     return 0;
 762 }
 763
 764 static unsigned int
 765 driGetAPIMask(__DRIscreen *screen)
 766 {
 767     return screen->api_mask;
 768 }
 769
 770 /**
 771  * swrast swapbuffers entrypoint.
 772  *
 773  * DRI2 implements this inside the loader with only flushes handled by the
 774  * driver.
 775  */
 776 static void
 777 driSwapBuffers(__DRIdrawable *pdp)
 778 {
 779     assert(pdp->driScreenPriv->swrast_loader);
 780
 781     pdp->driScreenPriv->driver->SwapBuffers(pdp);
 782 }
 783
 784 /** Core interface */
 785 const __DRIcoreExtension driCoreExtension = {
 786     .base = { __DRI_CORE, 2 },
 787
 788     .createNewScreen            = NULL,
 789     .destroyScreen              = driDestroyScreen,
 790     .getExtensions              = driGetExtensions,
 791     .getConfigAttrib            = driGetConfigAttrib,
 792     .indexConfigAttrib          = driIndexConfigAttrib,
 793     .createNewDrawable          = NULL,
 794     .destroyDrawable            = driDestroyDrawable,
 795     .swapBuffers                = driSwapBuffers, /* swrast */
 796     .createNewContext           = driCreateNewContext, /* swrast */
 797     .copyContext                = driCopyContext,
 798     .destroyContext             = driDestroyContext,
 799     .bindContext                = driBindContext,
 800     .unbindContext              = driUnbindContext
 801 };
 802
 803 /** DRI2 interface */
 804 const __DRIdri2Extension driDRI2Extension = {
 805     .base = { __DRI_DRI2, 4 },
 806
 807     .createNewScreen            = dri2CreateNewScreen,
 808     .createNewDrawable          = driCreateNewDrawable,
 809     .createNewContext           = driCreateNewContext,
 810     .getAPIMask                 = driGetAPIMask,
 811     .createNewContextForAPI     = driCreateNewContextForAPI,
 812     .allocateBuffer             = dri2AllocateBuffer,
 813     .releaseBuffer              = dri2ReleaseBuffer,
 814     .createContextAttribs       = driCreateContextAttribs,
 815     .createNewScreen2           = driCreateNewScreen2,
 816 };
 817
 818 const __DRIswrastExtension driSWRastExtension = {
 819     .base = { __DRI_SWRAST, 4 },
 820
 821     .createNewScreen            = driSWRastCreateNewScreen,
 822     .createNewDrawable          = driCreateNewDrawable,
 823     .createNewContextForAPI     = driCreateNewContextForAPI,
 824     .createContextAttribs       = driCreateContextAttribs,
 825     .createNewScreen2           = driSWRastCreateNewScreen2,
 826 };
 827
 828 const __DRI2configQueryExtension dri2ConfigQueryExtension = {
 829    .base = { __DRI2_CONFIG_QUERY, 1 },
 830
 831    .configQueryb        = dri2ConfigQueryb,
 832    .configQueryi        = dri2ConfigQueryi,
 833    .configQueryf        = dri2ConfigQueryf,
 834 };
 835
 836 void
 837 dri2InvalidateDrawable(__DRIdrawable *drawable)
 838 {
 839     drawable->dri2.stamp++;
 840 }
 841
 842 /**
 843  * Check that the gl_framebuffer associated with dPriv is the right size.
 844  * Resize the gl_framebuffer if needed.
 845  * It's expected that the dPriv->driverPrivate member points to a
 846  * gl_framebuffer object.
 847  */
 848 void
 849 driUpdateFramebufferSize(struct gl_context *ctx, const __DRIdrawable *dPriv)
 850 {
 851    struct gl_framebuffer *fb = (struct gl_framebuffer *) dPriv->driverPrivate;
 852    if (fb && (dPriv->w != fb->Width || dPriv->h != fb->Height)) {
 853       _mesa_resize_framebuffer(ctx, fb, dPriv->w, dPriv->h);
 854       /* if the driver needs the hw lock for ResizeBuffers, the drawable
 855          might have changed again by now */
 856       assert(fb->Width == dPriv->w);
 857       assert(fb->Height == dPriv->h);
 858    }
 859 }
 860
 861 uint32_t
 862 driGLFormatToImageFormat(mesa_format format)
 863 {
 864    switch (format) {
 865    case MESA_FORMAT_B5G6R5_UNORM:
 866       return __DRI_IMAGE_FORMAT_RGB565;
 867    case MESA_FORMAT_B5G5R5A1_UNORM:
 868       return __DRI_IMAGE_FORMAT_ARGB1555;
 869    case MESA_FORMAT_B8G8R8X8_UNORM:
 870       return __DRI_IMAGE_FORMAT_XRGB8888;
 871    case MESA_FORMAT_B10G10R10A2_UNORM:
 872       return __DRI_IMAGE_FORMAT_ARGB2101010;
 873    case MESA_FORMAT_B10G10R10X2_UNORM:
 874       return __DRI_IMAGE_FORMAT_XRGB2101010;
 875    case MESA_FORMAT_B8G8R8A8_UNORM:
 876       return __DRI_IMAGE_FORMAT_ARGB8888;
 877    case MESA_FORMAT_R8G8B8A8_UNORM:
 878       return __DRI_IMAGE_FORMAT_ABGR8888;
 879    case MESA_FORMAT_R8G8B8X8_UNORM:
 880       return __DRI_IMAGE_FORMAT_XBGR8888;
 881    case MESA_FORMAT_L_UNORM8:
 882    case MESA_FORMAT_R_UNORM8:
 883       return __DRI_IMAGE_FORMAT_R8;
 884    case MESA_FORMAT_L8A8_UNORM:
 885    case MESA_FORMAT_R8G8_UNORM:
 886       return __DRI_IMAGE_FORMAT_GR88;
 887    case MESA_FORMAT_NONE:
 888       return __DRI_IMAGE_FORMAT_NONE;
 889    case MESA_FORMAT_B8G8R8A8_SRGB:
 890       return __DRI_IMAGE_FORMAT_SARGB8;
 891    default:
 892       return 0;
 893    }
 894 }
 895
 896 mesa_format
 897 driImageFormatToGLFormat(uint32_t image_format)
 898 {
 899    switch (image_format) {
 900    case __DRI_IMAGE_FORMAT_RGB565:
 901       return MESA_FORMAT_B5G6R5_UNORM;
 902    case __DRI_IMAGE_FORMAT_ARGB1555:
 903       return MESA_FORMAT_B5G5R5A1_UNORM;
 904    case __DRI_IMAGE_FORMAT_XRGB8888:
 905       return MESA_FORMAT_B8G8R8X8_UNORM;
 906    case __DRI_IMAGE_FORMAT_ARGB2101010:
 907       return MESA_FORMAT_B10G10R10A2_UNORM;
 908    case __DRI_IMAGE_FORMAT_XRGB2101010:
 909       return MESA_FORMAT_B10G10R10X2_UNORM;
 910    case __DRI_IMAGE_FORMAT_ARGB8888:
 911       return MESA_FORMAT_B8G8R8A8_UNORM;
 912    case __DRI_IMAGE_FORMAT_ABGR8888:
 913       return MESA_FORMAT_R8G8B8A8_UNORM;
 914    case __DRI_IMAGE_FORMAT_XBGR8888:
 915       return MESA_FORMAT_R8G8B8X8_UNORM;
 916    case __DRI_IMAGE_FORMAT_R8:
 917       return MESA_FORMAT_R_UNORM8;
 918    case __DRI_IMAGE_FORMAT_R16:
 919       return MESA_FORMAT_R_UNORM16;
 920    case __DRI_IMAGE_FORMAT_GR88:
 921       return MESA_FORMAT_R8G8_UNORM;
 922    case __DRI_IMAGE_FORMAT_GR1616:
 923       return MESA_FORMAT_R16G16_UNORM;
 924    case __DRI_IMAGE_FORMAT_SARGB8:
 925       return MESA_FORMAT_B8G8R8A8_SRGB;
 926    case __DRI_IMAGE_FORMAT_NONE:
 927       return MESA_FORMAT_NONE;
 928    default:
 929       return MESA_FORMAT_NONE;
 930    }
 931 }
 932
 933 /** Image driver interface */
 934 const __DRIimageDriverExtension driImageDriverExtension = {
 935     .base = { __DRI_IMAGE_DRIVER, 1 },
 936
 937     .createNewScreen2           = driCreateNewScreen2,
 938     .createNewDrawable          = driCreateNewDrawable,
 939     .getAPIMask                 = driGetAPIMask,
 940     .createContextAttribs       = driCreateContextAttribs,
 941 };
 942
 943 /* swrast copy sub buffer entrypoint. */
 944 static void driCopySubBuffer(__DRIdrawable *pdp, int x, int y,
 945                              int w, int h)
 946 {
 947     assert(pdp->driScreenPriv->swrast_loader);
 948
 949     pdp->driScreenPriv->driver->CopySubBuffer(pdp, x, y, w, h);
 950 }
 951
 952 /* for swrast only */
 953 const __DRIcopySubBufferExtension driCopySubBufferExtension = {
 954    .base = { __DRI_COPY_SUB_BUFFER, 1 },
 955
 956    .copySubBuffer               = driCopySubBuffer,
 957 };
 958
 959 const __DRInoErrorExtension dri2NoErrorExtension = {
 960    .base = { __DRI2_NO_ERROR, 1 },
 961 };