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/version.h"
  48 #include "main/errors.h"
  49 #include "main/macros.h"
  50
  51 const char __dri2ConfigOptions[] =
  52    DRI_CONF_BEGIN
  53       DRI_CONF_SECTION_PERFORMANCE
  54          DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_1)
  55       DRI_CONF_SECTION_END
  56    DRI_CONF_END;
  57
  58 /*****************************************************************/
  59 /** \name Screen handling functions                              */
  60 /*****************************************************************/
  61 /*@{*/
  62
  63 static void
  64 setupLoaderExtensions(__DRIscreen *psp,
  65                       const __DRIextension **extensions)
  66 {
  67     int i;
  68
  69     for (i = 0; extensions[i]; i++) {
  70         if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
  71             psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
  72         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)
  73             psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];
  74         if (strcmp(extensions[i]->name, __DRI_USE_INVALIDATE) == 0)
  75             psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];
  76         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
  77             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
  78         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOADER) == 0)
  79            psp->image.loader = (__DRIimageLoaderExtension *) extensions[i];
  80     }
  81 }
  82
  83 /**
  84  * This pointer determines which driver API we'll use in the case of the
  85  * loader not passing us an explicit driver extensions list (that would,
  86  * itself, contain a pointer to a driver API.)
  87  *
  88  * A driver's driDriverGetExtensions_drivername() can update this pointer to
  89  * what it's returning, and a loader that is ignorant of createNewScreen2()
  90  * will get the correct driver screen created, as long as no other
  91  * driDriverGetExtensions() happened in between the first one and the
  92  * createNewScreen().
  93  *
  94  * This allows the X Server to not require the significant dri_interface.h
  95  * updates for doing createNewScreen2(), which would discourage backporting of
  96  * the X Server patches to support the new loader interface.
  97  */
  98 const struct __DriverAPIRec *globalDriverAPI = &driDriverAPI;
  99
 100 /**
 101  * This is the first entrypoint in the driver called by the DRI driver loader
 102  * after dlopen()ing it.
 103  *
 104  * It's used to create global state for the driver across contexts on the same
 105  * Display.
 106  */
 107 static __DRIscreen *
 108 driCreateNewScreen2(int scrn, int fd,
 109                     const __DRIextension **extensions,
 110                     const __DRIextension **driver_extensions,
 111                     const __DRIconfig ***driver_configs, void *data)
 112 {
 113     static const __DRIextension *emptyExtensionList[] = { NULL };
 114     __DRIscreen *psp;
 115
 116     psp = calloc(1, sizeof(*psp));
 117     if (!psp)
 118         return NULL;
 119
 120     /* By default, use the global driDriverAPI symbol (non-megadrivers). */
 121     psp->driver = globalDriverAPI;
 122
 123     /* If the driver exposes its vtable through its extensions list
 124      * (megadrivers), use that instead.
 125      */
 126     if (driver_extensions) {
 127        for (int i = 0; driver_extensions[i]; i++) {
 128           if (strcmp(driver_extensions[i]->name, __DRI_DRIVER_VTABLE) == 0) {
 129              psp->driver =
 130                 ((__DRIDriverVtableExtension *)driver_extensions[i])->vtable;
 131           }
 132        }
 133     }
 134
 135     setupLoaderExtensions(psp, extensions);
 136
 137     psp->loaderPrivate = data;
 138
 139     psp->extensions = emptyExtensionList;
 140     psp->fd = fd;
 141     psp->myNum = scrn;
 142
 143     *driver_configs = psp->driver->InitScreen(psp);
 144     if (*driver_configs == NULL) {
 145         free(psp);
 146         return NULL;
 147     }
 148
 149     struct gl_constants consts = { 0 };
 150     gl_api api;
 151     unsigned version;
 152
 153     api = API_OPENGLES2;
 154     if (_mesa_override_gl_version_contextless(&consts, &api, &version))
 155        psp->max_gl_es2_version = version;
 156
 157     api = API_OPENGL_COMPAT;
 158     if (_mesa_override_gl_version_contextless(&consts, &api, &version)) {
 159        if (api == API_OPENGL_CORE) {
 160           psp->max_gl_core_version = version;
 161        } else {
 162           psp->max_gl_compat_version = version;
 163        }
 164     }
 165
 166     psp->api_mask = 0;
 167     if (psp->max_gl_compat_version > 0)
 168        psp->api_mask |= (1 << __DRI_API_OPENGL);
 169     if (psp->max_gl_core_version > 0)
 170        psp->api_mask |= (1 << __DRI_API_OPENGL_CORE);
 171     if (psp->max_gl_es1_version > 0)
 172        psp->api_mask |= (1 << __DRI_API_GLES);
 173     if (psp->max_gl_es2_version > 0)
 174        psp->api_mask |= (1 << __DRI_API_GLES2);
 175     if (psp->max_gl_es2_version >= 30)
 176        psp->api_mask |= (1 << __DRI_API_GLES3);
 177
 178     driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions);
 179     driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum, "dri2");
 180
 181
 182     return psp;
 183 }
 184
 185 static __DRIscreen *
 186 dri2CreateNewScreen(int scrn, int fd,
 187                     const __DRIextension **extensions,
 188                     const __DRIconfig ***driver_configs, void *data)
 189 {
 190    return driCreateNewScreen2(scrn, fd, extensions, NULL,
 191                                driver_configs, data);
 192 }
 193
 194 /** swrast driver createNewScreen entrypoint. */
 195 static __DRIscreen *
 196 driSWRastCreateNewScreen(int scrn, const __DRIextension **extensions,
 197                          const __DRIconfig ***driver_configs, void *data)
 198 {
 199    return driCreateNewScreen2(scrn, -1, extensions, NULL,
 200                                driver_configs, data);
 201 }
 202
 203 static __DRIscreen *
 204 driSWRastCreateNewScreen2(int scrn, const __DRIextension **extensions,
 205                           const __DRIextension **driver_extensions,
 206                           const __DRIconfig ***driver_configs, void *data)
 207 {
 208    return driCreateNewScreen2(scrn, -1, extensions, driver_extensions,
 209                                driver_configs, data);
 210 }
 211
 212 /**
 213  * Destroy the per-screen private information.
 214  *
 215  * \internal
 216  * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
 217  * drmClose(), and finally frees \p screenPrivate.
 218  */
 219 static void driDestroyScreen(__DRIscreen *psp)
 220 {
 221     if (psp) {
 222         /* No interaction with the X-server is possible at this point.  This
 223          * routine is called after XCloseDisplay, so there is no protocol
 224          * stream open to the X-server anymore.
 225          */
 226
 227         psp->driver->DestroyScreen(psp);
 228
 229         driDestroyOptionCache(&psp->optionCache);
 230         driDestroyOptionInfo(&psp->optionInfo);
 231
 232         free(psp);
 233     }
 234 }
 235
 236 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 237 {
 238     return psp->extensions;
 239 }
 240
 241 /*@}*/
 242
 243
 244 static bool
 245 validate_context_version(__DRIscreen *screen,
 246                          int mesa_api,
 247                          unsigned major_version,
 248                          unsigned minor_version,
 249                          unsigned *dri_ctx_error)
 250 {
 251    unsigned req_version = 10 * major_version + minor_version;
 252    unsigned max_version = 0;
 253
 254    switch (mesa_api) {
 255    case API_OPENGL_COMPAT:
 256       max_version = screen->max_gl_compat_version;
 257       break;
 258    case API_OPENGL_CORE:
 259       max_version = screen->max_gl_core_version;
 260       break;
 261    case API_OPENGLES:
 262       max_version = screen->max_gl_es1_version;
 263       break;
 264    case API_OPENGLES2:
 265       max_version = screen->max_gl_es2_version;
 266       break;
 267    default:
 268       max_version = 0;
 269       break;
 270    }
 271
 272    if (max_version == 0) {
 273       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
 274       return false;
 275    } else if (req_version > max_version) {
 276       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
 277       return false;
 278    }
 279
 280    return true;
 281 }
 282
 283 /*****************************************************************/
 284 /** \name Context handling functions                             */
 285 /*****************************************************************/
 286 /*@{*/
 287
 288 static __DRIcontext *
 289 driCreateContextAttribs(__DRIscreen *screen, int api,
 290                         const __DRIconfig *config,
 291                         __DRIcontext *shared,
 292                         unsigned num_attribs,
 293                         const uint32_t *attribs,
 294                         unsigned *error,
 295                         void *data)
 296 {
 297     __DRIcontext *context;
 298     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
 299     void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 300     gl_api mesa_api;
 301     unsigned major_version = 1;
 302     unsigned minor_version = 0;
 303     uint32_t flags = 0;
 304     bool notify_reset = false;
 305
 306     assert((num_attribs == 0) || (attribs != NULL));
 307
 308     if (!(screen->api_mask & (1 << api))) {
 309         *error = __DRI_CTX_ERROR_BAD_API;
 310         return NULL;
 311     }
 312
 313     switch (api) {
 314     case __DRI_API_OPENGL:
 315         mesa_api = API_OPENGL_COMPAT;
 316         break;
 317     case __DRI_API_GLES:
 318         mesa_api = API_OPENGLES;
 319         break;
 320     case __DRI_API_GLES2:
 321     case __DRI_API_GLES3:
 322         mesa_api = API_OPENGLES2;
 323         break;
 324     case __DRI_API_OPENGL_CORE:
 325         mesa_api = API_OPENGL_CORE;
 326         break;
 327     default:
 328         *error = __DRI_CTX_ERROR_BAD_API;
 329         return NULL;
 330     }
 331
 332     for (unsigned i = 0; i < num_attribs; i++) {
 333         switch (attribs[i * 2]) {
 334         case __DRI_CTX_ATTRIB_MAJOR_VERSION:
 335             major_version = attribs[i * 2 + 1];
 336             break;
 337         case __DRI_CTX_ATTRIB_MINOR_VERSION:
 338             minor_version = attribs[i * 2 + 1];
 339             break;
 340         case __DRI_CTX_ATTRIB_FLAGS:
 341             flags = attribs[i * 2 + 1];
 342             break;
 343         case __DRI_CTX_ATTRIB_RESET_STRATEGY:
 344             notify_reset = (attribs[i * 2 + 1]
 345                             != __DRI_CTX_RESET_NO_NOTIFICATION);
 346             break;
 347         default:
 348             /* We can't create a context that satisfies the requirements of an
 349              * attribute that we don't understand.  Return failure.
 350              */
 351             assert(!"Should not get here.");
 352             *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 353             return NULL;
 354         }
 355     }
 356
 357     /* Mesa does not support the GL_ARB_compatibilty extension or the
 358      * compatibility profile.  This means that we treat a API_OPENGL_COMPAT 3.1 as
 359      * API_OPENGL_CORE and reject API_OPENGL_COMPAT 3.2+.
 360      */
 361     if (mesa_api == API_OPENGL_COMPAT && major_version == 3 && minor_version == 1)
 362        mesa_api = API_OPENGL_CORE;
 363
 364     if (mesa_api == API_OPENGL_COMPAT
 365         && ((major_version > 3)
 366             || (major_version == 3 && minor_version >= 2))) {
 367        *error = __DRI_CTX_ERROR_BAD_API;
 368        return NULL;
 369     }
 370
 371     /* The latest version of EGL_KHR_create_context spec says:
 372      *
 373      *     "If the EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR flag bit is set in
 374      *     EGL_CONTEXT_FLAGS_KHR, then a <debug context> will be created.
 375      *     [...] This bit is supported for OpenGL and OpenGL ES contexts.
 376      *
 377      * None of the other flags have any meaning in an ES context, so this seems safe.
 378      */
 379     if (mesa_api != API_OPENGL_COMPAT
 380         && mesa_api != API_OPENGL_CORE
 381         && (flags & ~__DRI_CTX_FLAG_DEBUG)) {
 382         *error = __DRI_CTX_ERROR_BAD_FLAG;
 383         return NULL;
 384     }
 385
 386     /* There are no forward-compatible contexts before OpenGL 3.0.  The
 387      * GLX_ARB_create_context spec says:
 388      *
 389      *     "Forward-compatible contexts are defined only for OpenGL versions
 390      *     3.0 and later."
 391      *
 392      * Forward-looking contexts are supported by silently converting the
 393      * requested API to API_OPENGL_CORE.
 394      *
 395      * In Mesa, a debug context is the same as a regular context.
 396      */
 397     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
 398        mesa_api = API_OPENGL_CORE;
 399     }
 400
 401     const uint32_t allowed_flags = (__DRI_CTX_FLAG_DEBUG
 402                                     | __DRI_CTX_FLAG_FORWARD_COMPATIBLE
 403                                     | __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS);
 404     if (flags & ~allowed_flags) {
 405         *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
 406         return NULL;
 407     }
 408
 409     if (!validate_context_version(screen, mesa_api,
 410                                   major_version, minor_version, error))
 411        return NULL;
 412
 413     context = calloc(1, sizeof *context);
 414     if (!context) {
 415         *error = __DRI_CTX_ERROR_NO_MEMORY;
 416         return NULL;
 417     }
 418
 419     context->loaderPrivate = data;
 420
 421     context->driScreenPriv = screen;
 422     context->driDrawablePriv = NULL;
 423     context->driReadablePriv = NULL;
 424
 425     if (!screen->driver->CreateContext(mesa_api, modes, context,
 426                                        major_version, minor_version,
 427                                        flags, notify_reset, error, shareCtx)) {
 428         free(context);
 429         return NULL;
 430     }
 431
 432     *error = __DRI_CTX_ERROR_SUCCESS;
 433     return context;
 434 }
 435
 436 void
 437 driContextSetFlags(struct gl_context *ctx, uint32_t flags)
 438 {
 439     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0)
 440         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 441     if ((flags & __DRI_CTX_FLAG_DEBUG) != 0) {
 442        _mesa_set_debug_state_int(ctx, GL_DEBUG_OUTPUT, GL_TRUE);
 443         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 444     }
 445 }
 446
 447 static __DRIcontext *
 448 driCreateNewContextForAPI(__DRIscreen *screen, int api,
 449                           const __DRIconfig *config,
 450                           __DRIcontext *shared, void *data)
 451 {
 452     unsigned error;
 453
 454     return driCreateContextAttribs(screen, api, config, shared, 0, NULL,
 455                                    &error, data);
 456 }
 457
 458 static __DRIcontext *
 459 driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 460                     __DRIcontext *shared, void *data)
 461 {
 462     return driCreateNewContextForAPI(screen, __DRI_API_OPENGL,
 463                                      config, shared, data);
 464 }
 465
 466 /**
 467  * Destroy the per-context private information.
 468  *
 469  * \internal
 470  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
 471  * drmDestroyContext(), and finally frees \p contextPrivate.
 472  */
 473 static void
 474 driDestroyContext(__DRIcontext *pcp)
 475 {
 476     if (pcp) {
 477         pcp->driScreenPriv->driver->DestroyContext(pcp);
 478         free(pcp);
 479     }
 480 }
 481
 482 static int
 483 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
 484 {
 485     (void) dest;
 486     (void) src;
 487     (void) mask;
 488     return GL_FALSE;
 489 }
 490
 491 /*@}*/
 492
 493
 494 /*****************************************************************/
 495 /** \name Context (un)binding functions                          */
 496 /*****************************************************************/
 497 /*@{*/
 498
 499 static void dri_get_drawable(__DRIdrawable *pdp);
 500 static void dri_put_drawable(__DRIdrawable *pdp);
 501
 502 /**
 503  * This function takes both a read buffer and a draw buffer.  This is needed
 504  * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
 505  * function.
 506  */
 507 static int driBindContext(__DRIcontext *pcp,
 508                           __DRIdrawable *pdp,
 509                           __DRIdrawable *prp)
 510 {
 511     /*
 512     ** Assume error checking is done properly in glXMakeCurrent before
 513     ** calling driUnbindContext.
 514     */
 515
 516     if (!pcp)
 517         return GL_FALSE;
 518
 519     /* Bind the drawable to the context */
 520     pcp->driDrawablePriv = pdp;
 521     pcp->driReadablePriv = prp;
 522     if (pdp) {
 523         pdp->driContextPriv = pcp;
 524         dri_get_drawable(pdp);
 525     }
 526     if (prp && pdp != prp) {
 527         dri_get_drawable(prp);
 528     }
 529
 530     return pcp->driScreenPriv->driver->MakeCurrent(pcp, pdp, prp);
 531 }
 532
 533 /**
 534  * Unbind context.
 535  *
 536  * \param scrn the screen.
 537  * \param gc context.
 538  *
 539  * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
 540  *
 541  * \internal
 542  * This function calls __DriverAPIRec::UnbindContext, and then decrements
 543  * __DRIdrawableRec::refcount which must be non-zero for a successful
 544  * return.
 545  *
 546  * While casting the opaque private pointers associated with the parameters
 547  * into their respective real types it also assures they are not \c NULL.
 548  */
 549 static int driUnbindContext(__DRIcontext *pcp)
 550 {
 551     __DRIdrawable *pdp;
 552     __DRIdrawable *prp;
 553
 554     /*
 555     ** Assume error checking is done properly in glXMakeCurrent before
 556     ** calling driUnbindContext.
 557     */
 558
 559     if (pcp == NULL)
 560         return GL_FALSE;
 561
 562     /*
 563     ** Call driUnbindContext before checking for valid drawables
 564     ** to handle surfaceless contexts properly.
 565     */
 566     pcp->driScreenPriv->driver->UnbindContext(pcp);
 567
 568     pdp = pcp->driDrawablePriv;
 569     prp = pcp->driReadablePriv;
 570
 571     /* already unbound */
 572     if (!pdp && !prp)
 573         return GL_TRUE;
 574
 575     assert(pdp);
 576     if (pdp->refcount == 0) {
 577         /* ERROR!!! */
 578         return GL_FALSE;
 579     }
 580
 581     dri_put_drawable(pdp);
 582
 583     if (prp != pdp) {
 584         if (prp->refcount == 0) {
 585             /* ERROR!!! */
 586             return GL_FALSE;
 587         }
 588
 589         dri_put_drawable(prp);
 590     }
 591
 592     pcp->driDrawablePriv = NULL;
 593     pcp->driReadablePriv = NULL;
 594
 595     return GL_TRUE;
 596 }
 597
 598 /*@}*/
 599
 600
 601 static void dri_get_drawable(__DRIdrawable *pdp)
 602 {
 603     pdp->refcount++;
 604 }
 605
 606 static void dri_put_drawable(__DRIdrawable *pdp)
 607 {
 608     if (pdp) {
 609         pdp->refcount--;
 610         if (pdp->refcount)
 611             return;
 612
 613         pdp->driScreenPriv->driver->DestroyBuffer(pdp);
 614         free(pdp);
 615     }
 616 }
 617
 618 static __DRIdrawable *
 619 driCreateNewDrawable(__DRIscreen *screen,
 620                      const __DRIconfig *config,
 621                      void *data)
 622 {
 623     __DRIdrawable *pdraw;
 624
 625     pdraw = malloc(sizeof *pdraw);
 626     if (!pdraw)
 627         return NULL;
 628
 629     pdraw->loaderPrivate = data;
 630
 631     pdraw->driScreenPriv = screen;
 632     pdraw->driContextPriv = NULL;
 633     pdraw->refcount = 0;
 634     pdraw->lastStamp = 0;
 635     pdraw->w = 0;
 636     pdraw->h = 0;
 637
 638     dri_get_drawable(pdraw);
 639
 640     if (!screen->driver->CreateBuffer(screen, pdraw, &config->modes,
 641                                       GL_FALSE)) {
 642        free(pdraw);
 643        return NULL;
 644     }
 645
 646     pdraw->dri2.stamp = pdraw->lastStamp + 1;
 647
 648     return pdraw;
 649 }
 650
 651 static void
 652 driDestroyDrawable(__DRIdrawable *pdp)
 653 {
 654     dri_put_drawable(pdp);
 655 }
 656
 657 static __DRIbuffer *
 658 dri2AllocateBuffer(__DRIscreen *screen,
 659                    unsigned int attachment, unsigned int format,
 660                    int width, int height)
 661 {
 662     return screen->driver->AllocateBuffer(screen, attachment, format,
 663                                           width, height);
 664 }
 665
 666 static void
 667 dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 668 {
 669     screen->driver->ReleaseBuffer(screen, buffer);
 670 }
 671
 672
 673 static int
 674 dri2ConfigQueryb(__DRIscreen *screen, const char *var, unsigned char *val)
 675 {
 676    if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
 677       return -1;
 678
 679    *val = driQueryOptionb(&screen->optionCache, var);
 680
 681    return 0;
 682 }
 683
 684 static int
 685 dri2ConfigQueryi(__DRIscreen *screen, const char *var, int *val)
 686 {
 687    if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
 688        !driCheckOption(&screen->optionCache, var, DRI_ENUM))
 689       return -1;
 690
 691     *val = driQueryOptioni(&screen->optionCache, var);
 692
 693     return 0;
 694 }
 695
 696 static int
 697 dri2ConfigQueryf(__DRIscreen *screen, const char *var, float *val)
 698 {
 699    if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
 700       return -1;
 701
 702     *val = driQueryOptionf(&screen->optionCache, var);
 703
 704     return 0;
 705 }
 706
 707 static unsigned int
 708 driGetAPIMask(__DRIscreen *screen)
 709 {
 710     return screen->api_mask;
 711 }
 712
 713 /**
 714  * swrast swapbuffers entrypoint.
 715  *
 716  * DRI2 implements this inside the loader with only flushes handled by the
 717  * driver.
 718  */
 719 static void
 720 driSwapBuffers(__DRIdrawable *pdp)
 721 {
 722     assert(pdp->driScreenPriv->swrast_loader);
 723
 724     pdp->driScreenPriv->driver->SwapBuffers(pdp);
 725 }
 726
 727 /** Core interface */
 728 const __DRIcoreExtension driCoreExtension = {
 729     .base = { __DRI_CORE, 1 },
 730
 731     .createNewScreen            = NULL,
 732     .destroyScreen              = driDestroyScreen,
 733     .getExtensions              = driGetExtensions,
 734     .getConfigAttrib            = driGetConfigAttrib,
 735     .indexConfigAttrib          = driIndexConfigAttrib,
 736     .createNewDrawable          = NULL,
 737     .destroyDrawable            = driDestroyDrawable,
 738     .swapBuffers                = driSwapBuffers, /* swrast */
 739     .createNewContext           = driCreateNewContext, /* swrast */
 740     .copyContext                = driCopyContext,
 741     .destroyContext             = driDestroyContext,
 742     .bindContext                = driBindContext,
 743     .unbindContext              = driUnbindContext
 744 };
 745
 746 /** DRI2 interface */
 747 const __DRIdri2Extension driDRI2Extension = {
 748     .base = { __DRI_DRI2, 4 },
 749
 750     .createNewScreen            = dri2CreateNewScreen,
 751     .createNewDrawable          = driCreateNewDrawable,
 752     .createNewContext           = driCreateNewContext,
 753     .getAPIMask                 = driGetAPIMask,
 754     .createNewContextForAPI     = driCreateNewContextForAPI,
 755     .allocateBuffer             = dri2AllocateBuffer,
 756     .releaseBuffer              = dri2ReleaseBuffer,
 757     .createContextAttribs       = driCreateContextAttribs,
 758     .createNewScreen2           = driCreateNewScreen2,
 759 };
 760
 761 const __DRIswrastExtension driSWRastExtension = {
 762     .base = { __DRI_SWRAST, 4 },
 763
 764     .createNewScreen            = driSWRastCreateNewScreen,
 765     .createNewDrawable          = driCreateNewDrawable,
 766     .createNewContextForAPI     = driCreateNewContextForAPI,
 767     .createContextAttribs       = driCreateContextAttribs,
 768     .createNewScreen2           = driSWRastCreateNewScreen2,
 769 };
 770
 771 const __DRI2configQueryExtension dri2ConfigQueryExtension = {
 772    .base = { __DRI2_CONFIG_QUERY, 1 },
 773
 774    .configQueryb        = dri2ConfigQueryb,
 775    .configQueryi        = dri2ConfigQueryi,
 776    .configQueryf        = dri2ConfigQueryf,
 777 };
 778
 779 void
 780 dri2InvalidateDrawable(__DRIdrawable *drawable)
 781 {
 782     drawable->dri2.stamp++;
 783 }
 784
 785 /**
 786  * Check that the gl_framebuffer associated with dPriv is the right size.
 787  * Resize the gl_framebuffer if needed.
 788  * It's expected that the dPriv->driverPrivate member points to a
 789  * gl_framebuffer object.
 790  */
 791 void
 792 driUpdateFramebufferSize(struct gl_context *ctx, const __DRIdrawable *dPriv)
 793 {
 794    struct gl_framebuffer *fb = (struct gl_framebuffer *) dPriv->driverPrivate;
 795    if (fb && (dPriv->w != fb->Width || dPriv->h != fb->Height)) {
 796       ctx->Driver.ResizeBuffers(ctx, fb, dPriv->w, dPriv->h);
 797       /* if the driver needs the hw lock for ResizeBuffers, the drawable
 798          might have changed again by now */
 799       assert(fb->Width == dPriv->w);
 800       assert(fb->Height == dPriv->h);
 801    }
 802 }
 803
 804 uint32_t
 805 driGLFormatToImageFormat(mesa_format format)
 806 {
 807    switch (format) {
 808    case MESA_FORMAT_B5G6R5_UNORM:
 809       return __DRI_IMAGE_FORMAT_RGB565;
 810    case MESA_FORMAT_B8G8R8X8_UNORM:
 811       return __DRI_IMAGE_FORMAT_XRGB8888;
 812    case MESA_FORMAT_B10G10R10A2_UNORM:
 813       return __DRI_IMAGE_FORMAT_ARGB2101010;
 814    case MESA_FORMAT_B10G10R10X2_UNORM:
 815       return __DRI_IMAGE_FORMAT_XRGB2101010;
 816    case MESA_FORMAT_B8G8R8A8_UNORM:
 817       return __DRI_IMAGE_FORMAT_ARGB8888;
 818    case MESA_FORMAT_R8G8B8A8_UNORM:
 819       return __DRI_IMAGE_FORMAT_ABGR8888;
 820    case MESA_FORMAT_R8G8B8X8_UNORM:
 821       return __DRI_IMAGE_FORMAT_XBGR8888;
 822    case MESA_FORMAT_R_UNORM8:
 823       return __DRI_IMAGE_FORMAT_R8;
 824    case MESA_FORMAT_R8G8_UNORM:
 825       return __DRI_IMAGE_FORMAT_GR88;
 826    case MESA_FORMAT_NONE:
 827       return __DRI_IMAGE_FORMAT_NONE;
 828    case MESA_FORMAT_B8G8R8A8_SRGB:
 829       return __DRI_IMAGE_FORMAT_SARGB8;
 830    default:
 831       return 0;
 832    }
 833 }
 834
 835 mesa_format
 836 driImageFormatToGLFormat(uint32_t image_format)
 837 {
 838    switch (image_format) {
 839    case __DRI_IMAGE_FORMAT_RGB565:
 840       return MESA_FORMAT_B5G6R5_UNORM;
 841    case __DRI_IMAGE_FORMAT_XRGB8888:
 842       return MESA_FORMAT_B8G8R8X8_UNORM;
 843    case __DRI_IMAGE_FORMAT_ARGB2101010:
 844       return MESA_FORMAT_B10G10R10A2_UNORM;
 845    case __DRI_IMAGE_FORMAT_XRGB2101010:
 846       return MESA_FORMAT_B10G10R10X2_UNORM;
 847    case __DRI_IMAGE_FORMAT_ARGB8888:
 848       return MESA_FORMAT_B8G8R8A8_UNORM;
 849    case __DRI_IMAGE_FORMAT_ABGR8888:
 850       return MESA_FORMAT_R8G8B8A8_UNORM;
 851    case __DRI_IMAGE_FORMAT_XBGR8888:
 852       return MESA_FORMAT_R8G8B8X8_UNORM;
 853    case __DRI_IMAGE_FORMAT_R8:
 854       return MESA_FORMAT_R_UNORM8;
 855    case __DRI_IMAGE_FORMAT_GR88:
 856       return MESA_FORMAT_R8G8_UNORM;
 857    case __DRI_IMAGE_FORMAT_SARGB8:
 858       return MESA_FORMAT_B8G8R8A8_SRGB;
 859    case __DRI_IMAGE_FORMAT_NONE:
 860       return MESA_FORMAT_NONE;
 861    default:
 862       return MESA_FORMAT_NONE;
 863    }
 864 }
 865
 866 /** Image driver interface */
 867 const __DRIimageDriverExtension driImageDriverExtension = {
 868     .base = { __DRI_IMAGE_DRIVER, 1 },
 869
 870     .createNewScreen2           = driCreateNewScreen2,
 871     .createNewDrawable          = driCreateNewDrawable,
 872     .getAPIMask                 = driGetAPIMask,
 873     .createContextAttribs       = driCreateContextAttribs,
 874 };
 875
 876 /* swrast copy sub buffer entrypoint. */
 877 static void driCopySubBuffer(__DRIdrawable *pdp, int x, int y,
 878                              int w, int h)
 879 {
 880     assert(pdp->driScreenPriv->swrast_loader);
 881
 882     pdp->driScreenPriv->driver->CopySubBuffer(pdp, x, y, w, h);
 883 }
 884
 885 /* for swrast only */
 886 const __DRIcopySubBufferExtension driCopySubBufferExtension = {
 887    .base = { __DRI_COPY_SUB_BUFFER, 1 },
 888
 889    .copySubBuffer               = driCopySubBuffer,
 890 };