src/glx/dri2_glx.c

   1 /*
   2  * Copyright © 2008 Red Hat, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Soft-
   6  * ware"), to deal in the Software without restriction, including without
   7  * limitation the rights to use, copy, modify, merge, publish, distribute,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, provided that the above copyright
  10  * notice(s) and this permission notice appear in all copies of the Soft-
  11  * ware and that both the above copyright notice(s) and this permission
  12  * notice appear in supporting documentation.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
  16  * ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY
  17  * RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN
  18  * THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSE-
  19  * QUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  20  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  21  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFOR-
  22  * MANCE OF THIS SOFTWARE.
  23  *
  24  * Except as contained in this notice, the name of a copyright holder shall
  25  * not be used in advertising or otherwise to promote the sale, use or
  26  * other dealings in this Software without prior written authorization of
  27  * the copyright holder.
  28  *
  29  * Authors:
  30  *   Kristian Høgsberg (krh@redhat.com)
  31  */
  32
  33 #if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
  34
  35 #include <X11/Xlib.h>
  36 #include <X11/extensions/Xfixes.h>
  37 #include <X11/Xlib-xcb.h>
  38 #include <xcb/xcb.h>
  39 #include <xcb/dri2.h>
  40 #include "glapi.h"
  41 #include "glxclient.h"
  42 #include <X11/extensions/dri2proto.h>
  43 #include "xf86dri.h"
  44 #include <dlfcn.h>
  45 #include <fcntl.h>
  46 #include <unistd.h>
  47 #include <sys/types.h>
  48 #include <sys/mman.h>
  49 #include <sys/time.h>
  50 #include "xf86drm.h"
  51 #include "dri2.h"
  52 #include "dri_common.h"
  53 #include "dri2_priv.h"
  54 #include "loader.h"
  55
  56 /* From xmlpool/options.h, user exposed so should be stable */
  57 #define DRI_CONF_VBLANK_NEVER 0
  58 #define DRI_CONF_VBLANK_DEF_INTERVAL_0 1
  59 #define DRI_CONF_VBLANK_DEF_INTERVAL_1 2
  60 #define DRI_CONF_VBLANK_ALWAYS_SYNC 3
  61
  62 #undef DRI2_MINOR
  63 #define DRI2_MINOR 1
  64
  65 struct dri2_display
  66 {
  67    __GLXDRIdisplay base;
  68
  69    /*
  70     ** XFree86-DRI version information
  71     */
  72    int driMajor;
  73    int driMinor;
  74    int driPatch;
  75    int swapAvailable;
  76    int invalidateAvailable;
  77
  78    __glxHashTable *dri2Hash;
  79
  80    const __DRIextension *loader_extensions[4];
  81 };
  82
  83 struct dri2_context
  84 {
  85    struct glx_context base;
  86    __DRIcontext *driContext;
  87 };
  88
  89 struct dri2_drawable
  90 {
  91    __GLXDRIdrawable base;
  92    __DRIdrawable *driDrawable;
  93    __DRIbuffer buffers[5];
  94    int bufferCount;
  95    int width, height;
  96    int have_back;
  97    int have_fake_front;
  98    int swap_interval;
  99
 100    uint64_t previous_time;
 101    unsigned frames;
 102 };
 103
 104 static const struct glx_context_vtable dri2_context_vtable;
 105
 106 /* For XCB's handling of ust/msc/sbc counters, we have to hand it the high and
 107  * low halves separately.  This helps you split them.
 108  */
 109 static void
 110 split_counter(uint64_t counter, uint32_t *hi, uint32_t *lo)
 111 {
 112    *hi = (counter >> 32);
 113    *lo = counter & 0xffffffff;
 114 }
 115
 116 static uint64_t
 117 merge_counter(uint32_t hi, uint32_t lo)
 118 {
 119    return ((uint64_t)hi << 32) | lo;
 120 }
 121
 122 static void
 123 dri2_destroy_context(struct glx_context *context)
 124 {
 125    struct dri2_context *pcp = (struct dri2_context *) context;
 126    struct dri2_screen *psc = (struct dri2_screen *) context->psc;
 127
 128    driReleaseDrawables(&pcp->base);
 129
 130    free((char *) context->extensions);
 131
 132    (*psc->core->destroyContext) (pcp->driContext);
 133
 134    free(pcp);
 135 }
 136
 137 static Bool
 138 dri2_bind_context(struct glx_context *context, struct glx_context *old,
 139                   GLXDrawable draw, GLXDrawable read)
 140 {
 141    struct dri2_context *pcp = (struct dri2_context *) context;
 142    struct dri2_screen *psc = (struct dri2_screen *) pcp->base.psc;
 143    struct dri2_drawable *pdraw, *pread;
 144    __DRIdrawable *dri_draw = NULL, *dri_read = NULL;
 145    struct dri2_display *pdp;
 146
 147    pdraw = (struct dri2_drawable *) driFetchDrawable(context, draw);
 148    pread = (struct dri2_drawable *) driFetchDrawable(context, read);
 149
 150    driReleaseDrawables(&pcp->base);
 151
 152    if (pdraw)
 153       dri_draw = pdraw->driDrawable;
 154    else if (draw != None)
 155       return GLXBadDrawable;
 156
 157    if (pread)
 158       dri_read = pread->driDrawable;
 159    else if (read != None)
 160       return GLXBadDrawable;
 161
 162    if (!(*psc->core->bindContext) (pcp->driContext, dri_draw, dri_read))
 163       return GLXBadContext;
 164
 165    /* If the server doesn't send invalidate events, we may miss a
 166     * resize before the rendering starts.  Invalidate the buffers now
 167     * so the driver will recheck before rendering starts. */
 168    pdp = (struct dri2_display *) psc->base.display;
 169    if (!pdp->invalidateAvailable && pdraw) {
 170       dri2InvalidateBuffers(psc->base.dpy, pdraw->base.xDrawable);
 171       if (pread != pdraw && pread)
 172          dri2InvalidateBuffers(psc->base.dpy, pread->base.xDrawable);
 173    }
 174
 175    return Success;
 176 }
 177
 178 static void
 179 dri2_unbind_context(struct glx_context *context, struct glx_context *new)
 180 {
 181    struct dri2_context *pcp = (struct dri2_context *) context;
 182    struct dri2_screen *psc = (struct dri2_screen *) pcp->base.psc;
 183
 184    (*psc->core->unbindContext) (pcp->driContext);
 185 }
 186
 187 static struct glx_context *
 188 dri2_create_context(struct glx_screen *base,
 189                     struct glx_config *config_base,
 190                     struct glx_context *shareList, int renderType)
 191 {
 192    struct dri2_context *pcp, *pcp_shared;
 193    struct dri2_screen *psc = (struct dri2_screen *) base;
 194    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 195    __DRIcontext *shared = NULL;
 196
 197    /* Check the renderType value */
 198    if (!validate_renderType_against_config(config_base, renderType))
 199        return NULL;
 200
 201    if (shareList) {
 202       /* If the shareList context is not a DRI2 context, we cannot possibly
 203        * create a DRI2 context that shares it.
 204        */
 205       if (shareList->vtable->destroy != dri2_destroy_context) {
 206          return NULL;
 207       }
 208
 209       pcp_shared = (struct dri2_context *) shareList;
 210       shared = pcp_shared->driContext;
 211    }
 212
 213    pcp = calloc(1, sizeof *pcp);
 214    if (pcp == NULL)
 215       return NULL;
 216
 217    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 218       free(pcp);
 219       return NULL;
 220    }
 221
 222    pcp->base.renderType = renderType;
 223
 224    pcp->driContext =
 225       (*psc->dri2->createNewContext) (psc->driScreen,
 226                                       config->driConfig, shared, pcp);
 227
 228    if (pcp->driContext == NULL) {
 229       free(pcp);
 230       return NULL;
 231    }
 232
 233    pcp->base.vtable = &dri2_context_vtable;
 234
 235    return &pcp->base;
 236 }
 237
 238 static struct glx_context *
 239 dri2_create_context_attribs(struct glx_screen *base,
 240                             struct glx_config *config_base,
 241                             struct glx_context *shareList,
 242                             unsigned num_attribs,
 243                             const uint32_t *attribs,
 244                             unsigned *error)
 245 {
 246    struct dri2_context *pcp = NULL;
 247    struct dri2_context *pcp_shared = NULL;
 248    struct dri2_screen *psc = (struct dri2_screen *) base;
 249    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 250    __DRIcontext *shared = NULL;
 251
 252    uint32_t minor_ver;
 253    uint32_t major_ver;
 254    uint32_t renderType;
 255    uint32_t flags;
 256    unsigned api;
 257    int reset;
 258    uint32_t ctx_attribs[2 * 5];
 259    unsigned num_ctx_attribs = 0;
 260
 261    if (psc->dri2->base.version < 3) {
 262       *error = __DRI_CTX_ERROR_NO_MEMORY;
 263       goto error_exit;
 264    }
 265
 266    /* Remap the GLX tokens to DRI2 tokens.
 267     */
 268    if (!dri2_convert_glx_attribs(num_attribs, attribs,
 269                                  &major_ver, &minor_ver, &renderType, &flags,
 270                                  &api, &reset, error))
 271       goto error_exit;
 272
 273    /* Check the renderType value */
 274    if (!validate_renderType_against_config(config_base, renderType))
 275        goto error_exit;
 276
 277    if (shareList) {
 278       pcp_shared = (struct dri2_context *) shareList;
 279       shared = pcp_shared->driContext;
 280    }
 281
 282    pcp = calloc(1, sizeof *pcp);
 283    if (pcp == NULL) {
 284       *error = __DRI_CTX_ERROR_NO_MEMORY;
 285       goto error_exit;
 286    }
 287
 288    if (!glx_context_init(&pcp->base, &psc->base, &config->base))
 289       goto error_exit;
 290
 291    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MAJOR_VERSION;
 292    ctx_attribs[num_ctx_attribs++] = major_ver;
 293    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MINOR_VERSION;
 294    ctx_attribs[num_ctx_attribs++] = minor_ver;
 295
 296    /* Only send a value when the non-default value is requested.  By doing
 297     * this we don't have to check the driver's DRI2 version before sending the
 298     * default value.
 299     */
 300    if (reset != __DRI_CTX_RESET_NO_NOTIFICATION) {
 301       ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_RESET_STRATEGY;
 302       ctx_attribs[num_ctx_attribs++] = reset;
 303    }
 304
 305    if (flags != 0) {
 306       ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_FLAGS;
 307
 308       /* The current __DRI_CTX_FLAG_* values are identical to the
 309        * GLX_CONTEXT_*_BIT values.
 310        */
 311       ctx_attribs[num_ctx_attribs++] = flags;
 312    }
 313
 314    /* The renderType is retrieved from attribs, or set to default
 315     *  of GLX_RGBA_TYPE.
 316     */
 317    pcp->base.renderType = renderType;
 318
 319    pcp->driContext =
 320       (*psc->dri2->createContextAttribs) (psc->driScreen,
 321                                           api,
 322                                           config->driConfig,
 323                                           shared,
 324                                           num_ctx_attribs / 2,
 325                                           ctx_attribs,
 326                                           error,
 327                                           pcp);
 328
 329    if (pcp->driContext == NULL)
 330       goto error_exit;
 331
 332    pcp->base.vtable = &dri2_context_vtable;
 333
 334    return &pcp->base;
 335
 336 error_exit:
 337    free(pcp);
 338
 339    return NULL;
 340 }
 341
 342 static void
 343 dri2DestroyDrawable(__GLXDRIdrawable *base)
 344 {
 345    struct dri2_screen *psc = (struct dri2_screen *) base->psc;
 346    struct dri2_drawable *pdraw = (struct dri2_drawable *) base;
 347    struct glx_display *dpyPriv = psc->base.display;
 348    struct dri2_display *pdp = (struct dri2_display *)dpyPriv->dri2Display;
 349
 350    __glxHashDelete(pdp->dri2Hash, pdraw->base.xDrawable);
 351    (*psc->core->destroyDrawable) (pdraw->driDrawable);
 352
 353    /* If it's a GLX 1.3 drawables, we can destroy the DRI2 drawable
 354     * now, as the application explicitly asked to destroy the GLX
 355     * drawable.  Otherwise, for legacy drawables, we let the DRI2
 356     * drawable linger on the server, since there's no good way of
 357     * knowing when the application is done with it.  The server will
 358     * destroy the DRI2 drawable when it destroys the X drawable or the
 359     * client exits anyway. */
 360    if (pdraw->base.xDrawable != pdraw->base.drawable)
 361       DRI2DestroyDrawable(psc->base.dpy, pdraw->base.xDrawable);
 362
 363    free(pdraw);
 364 }
 365
 366 static __GLXDRIdrawable *
 367 dri2CreateDrawable(struct glx_screen *base, XID xDrawable,
 368                    GLXDrawable drawable, struct glx_config *config_base)
 369 {
 370    struct dri2_drawable *pdraw;
 371    struct dri2_screen *psc = (struct dri2_screen *) base;
 372    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 373    struct glx_display *dpyPriv;
 374    struct dri2_display *pdp;
 375    GLint vblank_mode = DRI_CONF_VBLANK_DEF_INTERVAL_1;
 376
 377    dpyPriv = __glXInitialize(psc->base.dpy);
 378    if (dpyPriv == NULL)
 379       return NULL;
 380
 381    pdraw = calloc(1, sizeof(*pdraw));
 382    if (!pdraw)
 383       return NULL;
 384
 385    pdraw->base.destroyDrawable = dri2DestroyDrawable;
 386    pdraw->base.xDrawable = xDrawable;
 387    pdraw->base.drawable = drawable;
 388    pdraw->base.psc = &psc->base;
 389    pdraw->bufferCount = 0;
 390    pdraw->swap_interval = 1; /* default may be overridden below */
 391    pdraw->have_back = 0;
 392
 393    if (psc->config)
 394       psc->config->configQueryi(psc->driScreen,
 395                                 "vblank_mode", &vblank_mode);
 396
 397    switch (vblank_mode) {
 398    case DRI_CONF_VBLANK_NEVER:
 399    case DRI_CONF_VBLANK_DEF_INTERVAL_0:
 400       pdraw->swap_interval = 0;
 401       break;
 402    case DRI_CONF_VBLANK_DEF_INTERVAL_1:
 403    case DRI_CONF_VBLANK_ALWAYS_SYNC:
 404    default:
 405       pdraw->swap_interval = 1;
 406       break;
 407    }
 408
 409    DRI2CreateDrawable(psc->base.dpy, xDrawable);
 410    pdp = (struct dri2_display *)dpyPriv->dri2Display;;
 411    /* Create a new drawable */
 412    pdraw->driDrawable =
 413       (*psc->dri2->createNewDrawable) (psc->driScreen,
 414                                        config->driConfig, pdraw);
 415
 416    if (!pdraw->driDrawable) {
 417       DRI2DestroyDrawable(psc->base.dpy, xDrawable);
 418       free(pdraw);
 419       return NULL;
 420    }
 421
 422    if (__glxHashInsert(pdp->dri2Hash, xDrawable, pdraw)) {
 423       (*psc->core->destroyDrawable) (pdraw->driDrawable);
 424       DRI2DestroyDrawable(psc->base.dpy, xDrawable);
 425       free(pdraw);
 426       return None;
 427    }
 428
 429    /*
 430     * Make sure server has the same swap interval we do for the new
 431     * drawable.
 432     */
 433    if (psc->vtable.setSwapInterval)
 434       psc->vtable.setSwapInterval(&pdraw->base, pdraw->swap_interval);
 435
 436    return &pdraw->base;
 437 }
 438
 439 static int
 440 dri2DrawableGetMSC(struct glx_screen *psc, __GLXDRIdrawable *pdraw,
 441                    int64_t *ust, int64_t *msc, int64_t *sbc)
 442 {
 443    xcb_connection_t *c = XGetXCBConnection(pdraw->psc->dpy);
 444    xcb_dri2_get_msc_cookie_t get_msc_cookie;
 445    xcb_dri2_get_msc_reply_t *get_msc_reply;
 446
 447    get_msc_cookie = xcb_dri2_get_msc_unchecked(c, pdraw->xDrawable);
 448    get_msc_reply = xcb_dri2_get_msc_reply(c, get_msc_cookie, NULL);
 449
 450    if (!get_msc_reply)
 451       return 0;
 452
 453    *ust = merge_counter(get_msc_reply->ust_hi, get_msc_reply->ust_lo);
 454    *msc = merge_counter(get_msc_reply->msc_hi, get_msc_reply->msc_lo);
 455    *sbc = merge_counter(get_msc_reply->sbc_hi, get_msc_reply->sbc_lo);
 456    free(get_msc_reply);
 457
 458    return 1;
 459 }
 460
 461 static int
 462 dri2WaitForMSC(__GLXDRIdrawable *pdraw, int64_t target_msc, int64_t divisor,
 463                int64_t remainder, int64_t *ust, int64_t *msc, int64_t *sbc)
 464 {
 465    xcb_connection_t *c = XGetXCBConnection(pdraw->psc->dpy);
 466    xcb_dri2_wait_msc_cookie_t wait_msc_cookie;
 467    xcb_dri2_wait_msc_reply_t *wait_msc_reply;
 468    uint32_t target_msc_hi, target_msc_lo;
 469    uint32_t divisor_hi, divisor_lo;
 470    uint32_t remainder_hi, remainder_lo;
 471
 472    split_counter(target_msc, &target_msc_hi, &target_msc_lo);
 473    split_counter(divisor, &divisor_hi, &divisor_lo);
 474    split_counter(remainder, &remainder_hi, &remainder_lo);
 475
 476    wait_msc_cookie = xcb_dri2_wait_msc_unchecked(c, pdraw->xDrawable,
 477                                                  target_msc_hi, target_msc_lo,
 478                                                  divisor_hi, divisor_lo,
 479                                                  remainder_hi, remainder_lo);
 480    wait_msc_reply = xcb_dri2_wait_msc_reply(c, wait_msc_cookie, NULL);
 481
 482    if (!wait_msc_reply)
 483       return 0;
 484
 485    *ust = merge_counter(wait_msc_reply->ust_hi, wait_msc_reply->ust_lo);
 486    *msc = merge_counter(wait_msc_reply->msc_hi, wait_msc_reply->msc_lo);
 487    *sbc = merge_counter(wait_msc_reply->sbc_hi, wait_msc_reply->sbc_lo);
 488    free(wait_msc_reply);
 489
 490    return 1;
 491 }
 492
 493 static int
 494 dri2WaitForSBC(__GLXDRIdrawable *pdraw, int64_t target_sbc, int64_t *ust,
 495                int64_t *msc, int64_t *sbc)
 496 {
 497    xcb_connection_t *c = XGetXCBConnection(pdraw->psc->dpy);
 498    xcb_dri2_wait_sbc_cookie_t wait_sbc_cookie;
 499    xcb_dri2_wait_sbc_reply_t *wait_sbc_reply;
 500    uint32_t target_sbc_hi, target_sbc_lo;
 501
 502    split_counter(target_sbc, &target_sbc_hi, &target_sbc_lo);
 503
 504    wait_sbc_cookie = xcb_dri2_wait_sbc_unchecked(c, pdraw->xDrawable,
 505                                                  target_sbc_hi, target_sbc_lo);
 506    wait_sbc_reply = xcb_dri2_wait_sbc_reply(c, wait_sbc_cookie, NULL);
 507
 508    if (!wait_sbc_reply)
 509       return 0;
 510
 511    *ust = merge_counter(wait_sbc_reply->ust_hi, wait_sbc_reply->ust_lo);
 512    *msc = merge_counter(wait_sbc_reply->msc_hi, wait_sbc_reply->msc_lo);
 513    *sbc = merge_counter(wait_sbc_reply->sbc_hi, wait_sbc_reply->sbc_lo);
 514    free(wait_sbc_reply);
 515
 516    return 1;
 517 }
 518
 519 static __DRIcontext *
 520 dri2GetCurrentContext()
 521 {
 522    struct glx_context *gc = __glXGetCurrentContext();
 523    struct dri2_context *dri2Ctx = (struct dri2_context *)gc;
 524
 525    return dri2Ctx ? dri2Ctx->driContext : NULL;
 526 }
 527
 528 /**
 529  * dri2Throttle - Request driver throttling
 530  *
 531  * This function uses the DRI2 throttle extension to give the
 532  * driver the opportunity to throttle on flush front, copysubbuffer
 533  * and swapbuffers.
 534  */
 535 static void
 536 dri2Throttle(struct dri2_screen *psc,
 537              struct dri2_drawable *draw,
 538              enum __DRI2throttleReason reason)
 539 {
 540    if (psc->throttle) {
 541       __DRIcontext *ctx = dri2GetCurrentContext();
 542
 543       psc->throttle->throttle(ctx, draw->driDrawable, reason);
 544    }
 545 }
 546
 547 /**
 548  * Asks the driver to flush any queued work necessary for serializing with the
 549  * X command stream, and optionally the slightly more strict requirement of
 550  * glFlush() equivalence (which would require flushing even if nothing had
 551  * been drawn to a window system framebuffer, for example).
 552  */
 553 static void
 554 dri2Flush(struct dri2_screen *psc,
 555           __DRIcontext *ctx,
 556           struct dri2_drawable *draw,
 557           unsigned flags,
 558           enum __DRI2throttleReason throttle_reason)
 559 {
 560    if (ctx && psc->f && psc->f->base.version >= 4) {
 561       psc->f->flush_with_flags(ctx, draw->driDrawable, flags, throttle_reason);
 562    } else {
 563       if (flags & __DRI2_FLUSH_CONTEXT)
 564          glFlush();
 565
 566       if (psc->f)
 567          psc->f->flush(draw->driDrawable);
 568
 569       dri2Throttle(psc, draw, throttle_reason);
 570    }
 571 }
 572
 573 static void
 574 __dri2CopySubBuffer(__GLXDRIdrawable *pdraw, int x, int y,
 575                     int width, int height,
 576                     enum __DRI2throttleReason reason, Bool flush)
 577 {
 578    struct dri2_drawable *priv = (struct dri2_drawable *) pdraw;
 579    struct dri2_screen *psc = (struct dri2_screen *) pdraw->psc;
 580    XRectangle xrect;
 581    XserverRegion region;
 582    __DRIcontext *ctx = dri2GetCurrentContext();
 583    unsigned flags;
 584
 585    /* Check we have the right attachments */
 586    if (!priv->have_back)
 587       return;
 588
 589    xrect.x = x;
 590    xrect.y = priv->height - y - height;
 591    xrect.width = width;
 592    xrect.height = height;
 593
 594    flags = __DRI2_FLUSH_DRAWABLE;
 595    if (flush)
 596       flags |= __DRI2_FLUSH_CONTEXT;
 597    dri2Flush(psc, ctx, priv, flags, __DRI2_THROTTLE_SWAPBUFFER);
 598
 599    region = XFixesCreateRegion(psc->base.dpy, &xrect, 1);
 600    DRI2CopyRegion(psc->base.dpy, pdraw->xDrawable, region,
 601                   DRI2BufferFrontLeft, DRI2BufferBackLeft);
 602
 603    /* Refresh the fake front (if present) after we just damaged the real
 604     * front.
 605     */
 606    if (priv->have_fake_front)
 607       DRI2CopyRegion(psc->base.dpy, pdraw->xDrawable, region,
 608                      DRI2BufferFakeFrontLeft, DRI2BufferFrontLeft);
 609
 610    XFixesDestroyRegion(psc->base.dpy, region);
 611 }
 612
 613 static void
 614 dri2CopySubBuffer(__GLXDRIdrawable *pdraw, int x, int y,
 615                   int width, int height, Bool flush)
 616 {
 617    __dri2CopySubBuffer(pdraw, x, y, width, height,
 618                        __DRI2_THROTTLE_COPYSUBBUFFER, flush);
 619 }
 620
 621
 622 static void
 623 dri2_copy_drawable(struct dri2_drawable *priv, int dest, int src)
 624 {
 625    XRectangle xrect;
 626    XserverRegion region;
 627    struct dri2_screen *psc = (struct dri2_screen *) priv->base.psc;
 628
 629    xrect.x = 0;
 630    xrect.y = 0;
 631    xrect.width = priv->width;
 632    xrect.height = priv->height;
 633
 634    if (psc->f)
 635       (*psc->f->flush) (priv->driDrawable);
 636
 637    region = XFixesCreateRegion(psc->base.dpy, &xrect, 1);
 638    DRI2CopyRegion(psc->base.dpy, priv->base.xDrawable, region, dest, src);
 639    XFixesDestroyRegion(psc->base.dpy, region);
 640
 641 }
 642
 643 static void
 644 dri2_wait_x(struct glx_context *gc)
 645 {
 646    struct dri2_drawable *priv = (struct dri2_drawable *)
 647       GetGLXDRIDrawable(gc->currentDpy, gc->currentDrawable);
 648
 649    if (priv == NULL || !priv->have_fake_front)
 650       return;
 651
 652    dri2_copy_drawable(priv, DRI2BufferFakeFrontLeft, DRI2BufferFrontLeft);
 653 }
 654
 655 static void
 656 dri2_wait_gl(struct glx_context *gc)
 657 {
 658    struct dri2_drawable *priv = (struct dri2_drawable *)
 659       GetGLXDRIDrawable(gc->currentDpy, gc->currentDrawable);
 660
 661    if (priv == NULL || !priv->have_fake_front)
 662       return;
 663
 664    dri2_copy_drawable(priv, DRI2BufferFrontLeft, DRI2BufferFakeFrontLeft);
 665 }
 666
 667 /**
 668  * Called by the driver when it needs to update the real front buffer with the
 669  * contents of its fake front buffer.
 670  */
 671 static void
 672 dri2FlushFrontBuffer(__DRIdrawable *driDrawable, void *loaderPrivate)
 673 {
 674    struct glx_display *priv;
 675    struct dri2_display *pdp;
 676    struct glx_context *gc;
 677    struct dri2_drawable *pdraw = loaderPrivate;
 678    struct dri2_screen *psc;
 679
 680    if (!pdraw)
 681       return;
 682
 683    if (!pdraw->base.psc)
 684       return;
 685
 686    psc = (struct dri2_screen *) pdraw->base.psc;
 687
 688    priv = __glXInitialize(psc->base.dpy);
 689
 690    if (priv == NULL)
 691        return;
 692
 693    pdp = (struct dri2_display *) priv->dri2Display;
 694    gc = __glXGetCurrentContext();
 695
 696    dri2Throttle(psc, pdraw, __DRI2_THROTTLE_FLUSHFRONT);
 697
 698    /* Old servers don't send invalidate events */
 699    if (!pdp->invalidateAvailable)
 700        dri2InvalidateBuffers(priv->dpy, pdraw->base.xDrawable);
 701
 702    dri2_wait_gl(gc);
 703 }
 704
 705
 706 static void
 707 dri2DestroyScreen(struct glx_screen *base)
 708 {
 709    struct dri2_screen *psc = (struct dri2_screen *) base;
 710
 711    /* Free the direct rendering per screen data */
 712    (*psc->core->destroyScreen) (psc->driScreen);
 713    driDestroyConfigs(psc->driver_configs);
 714    close(psc->fd);
 715    free(psc);
 716 }
 717
 718 /**
 719  * Process list of buffer received from the server
 720  *
 721  * Processes the list of buffers received in a reply from the server to either
 722  * \c DRI2GetBuffers or \c DRI2GetBuffersWithFormat.
 723  */
 724 static void
 725 process_buffers(struct dri2_drawable * pdraw, DRI2Buffer * buffers,
 726                 unsigned count)
 727 {
 728    int i;
 729
 730    pdraw->bufferCount = count;
 731    pdraw->have_fake_front = 0;
 732    pdraw->have_back = 0;
 733
 734    /* This assumes the DRI2 buffer attachment tokens matches the
 735     * __DRIbuffer tokens. */
 736    for (i = 0; i < count; i++) {
 737       pdraw->buffers[i].attachment = buffers[i].attachment;
 738       pdraw->buffers[i].name = buffers[i].name;
 739       pdraw->buffers[i].pitch = buffers[i].pitch;
 740       pdraw->buffers[i].cpp = buffers[i].cpp;
 741       pdraw->buffers[i].flags = buffers[i].flags;
 742       if (pdraw->buffers[i].attachment == __DRI_BUFFER_FAKE_FRONT_LEFT)
 743          pdraw->have_fake_front = 1;
 744       if (pdraw->buffers[i].attachment == __DRI_BUFFER_BACK_LEFT)
 745          pdraw->have_back = 1;
 746    }
 747
 748 }
 749
 750 unsigned dri2GetSwapEventType(Display* dpy, XID drawable)
 751 {
 752       struct glx_display *glx_dpy = __glXInitialize(dpy);
 753       __GLXDRIdrawable *pdraw;
 754       pdraw = dri2GetGlxDrawableFromXDrawableId(dpy, drawable);
 755       if (!pdraw || !(pdraw->eventMask & GLX_BUFFER_SWAP_COMPLETE_INTEL_MASK))
 756          return 0;
 757       return glx_dpy->codes->first_event + GLX_BufferSwapComplete;
 758 }
 759
 760 static void show_fps(struct dri2_drawable *draw)
 761 {
 762    const int interval =
 763       ((struct dri2_screen *) draw->base.psc)->show_fps_interval;
 764    struct timeval tv;
 765    uint64_t current_time;
 766
 767    gettimeofday(&tv, 0);
 768    current_time = (uint64_t)tv.tv_sec*1000000 + (uint64_t)tv.tv_usec;
 769
 770    draw->frames++;
 771
 772    if (draw->previous_time + interval * 1000000 <= current_time) {
 773       if (draw->previous_time) {
 774          fprintf(stderr, "libGL: FPS = %.1f\n",
 775                  ((uint64_t)draw->frames * 1000000) /
 776                  (double)(current_time - draw->previous_time));
 777       }
 778       draw->frames = 0;
 779       draw->previous_time = current_time;
 780    }
 781 }
 782
 783 static int64_t
 784 dri2XcbSwapBuffers(Display *dpy,
 785                   __GLXDRIdrawable *pdraw,
 786                   int64_t target_msc,
 787                   int64_t divisor,
 788                   int64_t remainder)
 789 {
 790    xcb_dri2_swap_buffers_cookie_t swap_buffers_cookie;
 791    xcb_dri2_swap_buffers_reply_t *swap_buffers_reply;
 792    uint32_t target_msc_hi, target_msc_lo;
 793    uint32_t divisor_hi, divisor_lo;
 794    uint32_t remainder_hi, remainder_lo;
 795    int64_t ret = 0;
 796    xcb_connection_t *c = XGetXCBConnection(dpy);
 797
 798    split_counter(target_msc, &target_msc_hi, &target_msc_lo);
 799    split_counter(divisor, &divisor_hi, &divisor_lo);
 800    split_counter(remainder, &remainder_hi, &remainder_lo);
 801
 802    swap_buffers_cookie =
 803       xcb_dri2_swap_buffers_unchecked(c, pdraw->xDrawable,
 804                                       target_msc_hi, target_msc_lo,
 805                                       divisor_hi, divisor_lo,
 806                                       remainder_hi, remainder_lo);
 807
 808    /* Immediately wait on the swapbuffers reply.  If we didn't, we'd have
 809     * to do so some time before reusing a (non-pageflipped) backbuffer.
 810     * Otherwise, the new rendering could get ahead of the X Server's
 811     * dispatch of the swapbuffer and you'd display garbage.
 812     *
 813     * We use XSync() first to reap the invalidate events through the event
 814     * filter, to ensure that the next drawing doesn't use an invalidated
 815     * buffer.
 816     */
 817    XSync(dpy, False);
 818
 819    swap_buffers_reply =
 820       xcb_dri2_swap_buffers_reply(c, swap_buffers_cookie, NULL);
 821    if (swap_buffers_reply) {
 822       ret = merge_counter(swap_buffers_reply->swap_hi,
 823                           swap_buffers_reply->swap_lo);
 824       free(swap_buffers_reply);
 825    }
 826    return ret;
 827 }
 828
 829 static int64_t
 830 dri2SwapBuffers(__GLXDRIdrawable *pdraw, int64_t target_msc, int64_t divisor,
 831                 int64_t remainder, Bool flush)
 832 {
 833     struct dri2_drawable *priv = (struct dri2_drawable *) pdraw;
 834     struct glx_display *dpyPriv = __glXInitialize(priv->base.psc->dpy);
 835     struct dri2_screen *psc = (struct dri2_screen *) priv->base.psc;
 836     struct dri2_display *pdp =
 837         (struct dri2_display *)dpyPriv->dri2Display;
 838     int64_t ret = 0;
 839
 840     /* Check we have the right attachments */
 841     if (!priv->have_back)
 842         return ret;
 843
 844     /* Old servers can't handle swapbuffers */
 845     if (!pdp->swapAvailable) {
 846        __dri2CopySubBuffer(pdraw, 0, 0, priv->width, priv->height,
 847                            __DRI2_THROTTLE_SWAPBUFFER, flush);
 848     } else {
 849        __DRIcontext *ctx = dri2GetCurrentContext();
 850        unsigned flags = __DRI2_FLUSH_DRAWABLE;
 851        if (flush)
 852           flags |= __DRI2_FLUSH_CONTEXT;
 853        dri2Flush(psc, ctx, priv, flags, __DRI2_THROTTLE_SWAPBUFFER);
 854
 855        ret = dri2XcbSwapBuffers(pdraw->psc->dpy, pdraw,
 856                                 target_msc, divisor, remainder);
 857     }
 858
 859     if (psc->show_fps_interval) {
 860        show_fps(priv);
 861     }
 862
 863     /* Old servers don't send invalidate events */
 864     if (!pdp->invalidateAvailable)
 865        dri2InvalidateBuffers(dpyPriv->dpy, pdraw->xDrawable);
 866
 867     return ret;
 868 }
 869
 870 static __DRIbuffer *
 871 dri2GetBuffers(__DRIdrawable * driDrawable,
 872                int *width, int *height,
 873                unsigned int *attachments, int count,
 874                int *out_count, void *loaderPrivate)
 875 {
 876    struct dri2_drawable *pdraw = loaderPrivate;
 877    DRI2Buffer *buffers;
 878
 879    buffers = DRI2GetBuffers(pdraw->base.psc->dpy, pdraw->base.xDrawable,
 880                             width, height, attachments, count, out_count);
 881    if (buffers == NULL)
 882       return NULL;
 883
 884    pdraw->width = *width;
 885    pdraw->height = *height;
 886    process_buffers(pdraw, buffers, *out_count);
 887
 888    free(buffers);
 889
 890    return pdraw->buffers;
 891 }
 892
 893 static __DRIbuffer *
 894 dri2GetBuffersWithFormat(__DRIdrawable * driDrawable,
 895                          int *width, int *height,
 896                          unsigned int *attachments, int count,
 897                          int *out_count, void *loaderPrivate)
 898 {
 899    struct dri2_drawable *pdraw = loaderPrivate;
 900    DRI2Buffer *buffers;
 901
 902    buffers = DRI2GetBuffersWithFormat(pdraw->base.psc->dpy,
 903                                       pdraw->base.xDrawable,
 904                                       width, height, attachments,
 905                                       count, out_count);
 906    if (buffers == NULL)
 907       return NULL;
 908
 909    pdraw->width = *width;
 910    pdraw->height = *height;
 911    process_buffers(pdraw, buffers, *out_count);
 912
 913    free(buffers);
 914
 915    return pdraw->buffers;
 916 }
 917
 918 static int
 919 dri2SetSwapInterval(__GLXDRIdrawable *pdraw, int interval)
 920 {
 921    xcb_connection_t *c = XGetXCBConnection(pdraw->psc->dpy);
 922    struct dri2_drawable *priv =  (struct dri2_drawable *) pdraw;
 923    GLint vblank_mode = DRI_CONF_VBLANK_DEF_INTERVAL_1;
 924    struct dri2_screen *psc = (struct dri2_screen *) priv->base.psc;
 925
 926    if (psc->config)
 927       psc->config->configQueryi(psc->driScreen,
 928                                 "vblank_mode", &vblank_mode);
 929
 930    switch (vblank_mode) {
 931    case DRI_CONF_VBLANK_NEVER:
 932       if (interval != 0)
 933          return GLX_BAD_VALUE;
 934       break;
 935    case DRI_CONF_VBLANK_ALWAYS_SYNC:
 936       if (interval <= 0)
 937          return GLX_BAD_VALUE;
 938       break;
 939    default:
 940       break;
 941    }
 942
 943    xcb_dri2_swap_interval(c, priv->base.xDrawable, interval);
 944    priv->swap_interval = interval;
 945
 946    return 0;
 947 }
 948
 949 static int
 950 dri2GetSwapInterval(__GLXDRIdrawable *pdraw)
 951 {
 952    struct dri2_drawable *priv =  (struct dri2_drawable *) pdraw;
 953
 954   return priv->swap_interval;
 955 }
 956
 957 static const __DRIdri2LoaderExtension dri2LoaderExtension = {
 958    {__DRI_DRI2_LOADER, __DRI_DRI2_LOADER_VERSION},
 959    dri2GetBuffers,
 960    dri2FlushFrontBuffer,
 961    dri2GetBuffersWithFormat,
 962 };
 963
 964 static const __DRIdri2LoaderExtension dri2LoaderExtension_old = {
 965    {__DRI_DRI2_LOADER, __DRI_DRI2_LOADER_VERSION},
 966    dri2GetBuffers,
 967    dri2FlushFrontBuffer,
 968    NULL,
 969 };
 970
 971 static const __DRIuseInvalidateExtension dri2UseInvalidate = {
 972    { __DRI_USE_INVALIDATE, __DRI_USE_INVALIDATE_VERSION }
 973 };
 974
 975 _X_HIDDEN void
 976 dri2InvalidateBuffers(Display *dpy, XID drawable)
 977 {
 978    __GLXDRIdrawable *pdraw =
 979       dri2GetGlxDrawableFromXDrawableId(dpy, drawable);
 980    struct dri2_screen *psc;
 981    struct dri2_drawable *pdp = (struct dri2_drawable *) pdraw;
 982
 983    if (!pdraw)
 984       return;
 985
 986    psc = (struct dri2_screen *) pdraw->psc;
 987
 988    if (pdraw && psc->f && psc->f->base.version >= 3 && psc->f->invalidate)
 989        psc->f->invalidate(pdp->driDrawable);
 990 }
 991
 992 static void
 993 dri2_bind_tex_image(Display * dpy,
 994                     GLXDrawable drawable,
 995                     int buffer, const int *attrib_list)
 996 {
 997    struct glx_context *gc = __glXGetCurrentContext();
 998    struct dri2_context *pcp = (struct dri2_context *) gc;
 999    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
1000    struct glx_display *dpyPriv = __glXInitialize(dpy);
1001    struct dri2_drawable *pdraw = (struct dri2_drawable *) base;
1002    struct dri2_display *pdp;
1003    struct dri2_screen *psc;
1004
1005    if (dpyPriv == NULL)
1006        return;
1007
1008    pdp = (struct dri2_display *) dpyPriv->dri2Display;
1009
1010    if (pdraw != NULL) {
1011       psc = (struct dri2_screen *) base->psc;
1012
1013       if (!pdp->invalidateAvailable && psc->f &&
1014            psc->f->base.version >= 3 && psc->f->invalidate)
1015          psc->f->invalidate(pdraw->driDrawable);
1016
1017       if (psc->texBuffer->base.version >= 2 &&
1018           psc->texBuffer->setTexBuffer2 != NULL) {
1019          (*psc->texBuffer->setTexBuffer2) (pcp->driContext,
1020                                            pdraw->base.textureTarget,
1021                                            pdraw->base.textureFormat,
1022                                            pdraw->driDrawable);
1023       }
1024       else {
1025          (*psc->texBuffer->setTexBuffer) (pcp->driContext,
1026                                           pdraw->base.textureTarget,
1027                                           pdraw->driDrawable);
1028       }
1029    }
1030 }
1031
1032 static void
1033 dri2_release_tex_image(Display * dpy, GLXDrawable drawable, int buffer)
1034 {
1035 #if __DRI_TEX_BUFFER_VERSION >= 3
1036    struct glx_context *gc = __glXGetCurrentContext();
1037    struct dri2_context *pcp = (struct dri2_context *) gc;
1038    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
1039    struct glx_display *dpyPriv = __glXInitialize(dpy);
1040    struct dri2_drawable *pdraw = (struct dri2_drawable *) base;
1041    struct dri2_display *pdp =
1042       (struct dri2_display *) dpyPriv->dri2Display;
1043    struct dri2_screen *psc;
1044
1045    if (pdraw != NULL) {
1046       psc = (struct dri2_screen *) base->psc;
1047
1048       if (psc->texBuffer->base.version >= 3 &&
1049           psc->texBuffer->releaseTexBuffer != NULL) {
1050          (*psc->texBuffer->releaseTexBuffer) (pcp->driContext,
1051                                            pdraw->base.textureTarget,
1052                                            pdraw->driDrawable);
1053       }
1054    }
1055 #endif
1056 }
1057
1058 static const struct glx_context_vtable dri2_context_vtable = {
1059    dri2_destroy_context,
1060    dri2_bind_context,
1061    dri2_unbind_context,
1062    dri2_wait_gl,
1063    dri2_wait_x,
1064    DRI_glXUseXFont,
1065    dri2_bind_tex_image,
1066    dri2_release_tex_image,
1067    NULL, /* get_proc_address */
1068 };
1069
1070 static void
1071 dri2BindExtensions(struct dri2_screen *psc, struct glx_display * priv,
1072                    const char *driverName)
1073 {
1074    const struct dri2_display *const pdp = (struct dri2_display *)
1075       priv->dri2Display;
1076    const __DRIextension **extensions;
1077    int i;
1078
1079    extensions = psc->core->getExtensions(psc->driScreen);
1080
1081    __glXEnableDirectExtension(&psc->base, "GLX_SGI_video_sync");
1082    __glXEnableDirectExtension(&psc->base, "GLX_SGI_swap_control");
1083    __glXEnableDirectExtension(&psc->base, "GLX_MESA_swap_control");
1084    __glXEnableDirectExtension(&psc->base, "GLX_SGI_make_current_read");
1085
1086    /*
1087     * GLX_INTEL_swap_event is broken on the server side, where it's
1088     * currently unconditionally enabled. This completely breaks
1089     * systems running on drivers which don't support that extension.
1090     * There's no way to test for its presence on this side, so instead
1091     * of disabling it unconditionally, just disable it for drivers
1092     * which are known to not support it, or for DDX drivers supporting
1093     * only an older (pre-ScheduleSwap) version of DRI2.
1094     *
1095     * This is a hack which is required until:
1096     * http://lists.x.org/archives/xorg-devel/2013-February/035449.html
1097     * is merged and updated xserver makes it's way into distros:
1098     */
1099    if (pdp->swapAvailable && strcmp(driverName, "vmwgfx") != 0) {
1100       __glXEnableDirectExtension(&psc->base, "GLX_INTEL_swap_event");
1101    }
1102
1103    if (psc->dri2->base.version >= 3) {
1104       const unsigned mask = psc->dri2->getAPIMask(psc->driScreen);
1105
1106       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
1107       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context_profile");
1108
1109       if ((mask & (1 << __DRI_API_GLES2)) != 0)
1110          __glXEnableDirectExtension(&psc->base,
1111                                     "GLX_EXT_create_context_es2_profile");
1112    }
1113
1114    for (i = 0; extensions[i]; i++) {
1115       if ((strcmp(extensions[i]->name, __DRI_TEX_BUFFER) == 0)) {
1116          psc->texBuffer = (__DRItexBufferExtension *) extensions[i];
1117          __glXEnableDirectExtension(&psc->base, "GLX_EXT_texture_from_pixmap");
1118       }
1119
1120       if ((strcmp(extensions[i]->name, __DRI2_FLUSH) == 0)) {
1121          psc->f = (__DRI2flushExtension *) extensions[i];
1122          /* internal driver extension, no GL extension exposed */
1123       }
1124
1125       if ((strcmp(extensions[i]->name, __DRI2_CONFIG_QUERY) == 0))
1126          psc->config = (__DRI2configQueryExtension *) extensions[i];
1127
1128       if (((strcmp(extensions[i]->name, __DRI2_THROTTLE) == 0)))
1129          psc->throttle = (__DRI2throttleExtension *) extensions[i];
1130
1131       /* DRI2 version 3 is also required because
1132        * GLX_ARB_create_context_robustness requires GLX_ARB_create_context.
1133        */
1134       if (psc->dri2->base.version >= 3
1135           && strcmp(extensions[i]->name, __DRI2_ROBUSTNESS) == 0)
1136          __glXEnableDirectExtension(&psc->base,
1137                                     "GLX_ARB_create_context_robustness");
1138
1139       /* DRI2 version 3 is also required because GLX_MESA_query_renderer
1140        * requires GLX_ARB_create_context_profile.
1141        */
1142       if (psc->dri2->base.version >= 3
1143           && strcmp(extensions[i]->name, __DRI2_RENDERER_QUERY) == 0) {
1144          psc->rendererQuery = (__DRI2rendererQueryExtension *) extensions[i];
1145          __glXEnableDirectExtension(&psc->base, "GLX_MESA_query_renderer");
1146       }
1147    }
1148 }
1149
1150 static const struct glx_screen_vtable dri2_screen_vtable = {
1151    dri2_create_context,
1152    dri2_create_context_attribs,
1153    dri2_query_renderer_integer,
1154    dri2_query_renderer_string,
1155 };
1156
1157 static struct glx_screen *
1158 dri2CreateScreen(int screen, struct glx_display * priv)
1159 {
1160    const __DRIconfig **driver_configs;
1161    const __DRIextension **extensions;
1162    const struct dri2_display *const pdp = (struct dri2_display *)
1163       priv->dri2Display;
1164    struct dri2_screen *psc;
1165    __GLXDRIscreen *psp;
1166    struct glx_config *configs = NULL, *visuals = NULL;
1167    char *driverName = NULL, *loader_driverName, *deviceName, *tmp;
1168    drm_magic_t magic;
1169    int i;
1170
1171    psc = calloc(1, sizeof *psc);
1172    if (psc == NULL)
1173       return NULL;
1174
1175    psc->fd = -1;
1176
1177    if (!glx_screen_init(&psc->base, screen, priv)) {
1178       free(psc);
1179       return NULL;
1180    }
1181
1182    if (!DRI2Connect(priv->dpy, RootWindow(priv->dpy, screen),
1183                     &driverName, &deviceName)) {
1184       glx_screen_cleanup(&psc->base);
1185       free(psc);
1186       InfoMessageF("screen %d does not appear to be DRI2 capable\n", screen);
1187       return NULL;
1188    }
1189
1190 #ifdef O_CLOEXEC
1191    psc->fd = open(deviceName, O_RDWR | O_CLOEXEC);
1192    if (psc->fd == -1 && errno == EINVAL)
1193 #endif
1194    {
1195       psc->fd = open(deviceName, O_RDWR);
1196       if (psc->fd != -1)
1197          fcntl(psc->fd, F_SETFD, fcntl(psc->fd, F_GETFD) | FD_CLOEXEC);
1198    }
1199    if (psc->fd < 0) {
1200       ErrorMessageF("failed to open drm device: %s\n", strerror(errno));
1201       goto handle_error;
1202    }
1203
1204    /* If Mesa knows about the appropriate driver for this fd, then trust it.
1205     * Otherwise, default to the server's value.
1206     */
1207    loader_driverName = loader_get_driver_for_fd(psc->fd, 0);
1208    if (loader_driverName) {
1209       free(driverName);
1210       driverName = loader_driverName;
1211    }
1212
1213    psc->driver = driOpenDriver(driverName);
1214    if (psc->driver == NULL) {
1215       ErrorMessageF("driver pointer missing\n");
1216       goto handle_error;
1217    }
1218
1219    extensions = driGetDriverExtensions(psc->driver, driverName);
1220    if (extensions == NULL)
1221       goto handle_error;
1222
1223    for (i = 0; extensions[i]; i++) {
1224       if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
1225          psc->core = (__DRIcoreExtension *) extensions[i];
1226       if (strcmp(extensions[i]->name, __DRI_DRI2) == 0)
1227          psc->dri2 = (__DRIdri2Extension *) extensions[i];
1228    }
1229
1230    if (psc->core == NULL || psc->dri2 == NULL) {
1231       ErrorMessageF("core dri or dri2 extension not found\n");
1232       goto handle_error;
1233    }
1234
1235    if (drmGetMagic(psc->fd, &magic)) {
1236       ErrorMessageF("failed to get magic\n");
1237       goto handle_error;
1238    }
1239
1240    if (!DRI2Authenticate(priv->dpy, RootWindow(priv->dpy, screen), magic)) {
1241       ErrorMessageF("failed to authenticate magic %d\n", magic);
1242       goto handle_error;
1243    }
1244
1245    if (psc->dri2->base.version >= 4) {
1246       psc->driScreen =
1247          psc->dri2->createNewScreen2(screen, psc->fd,
1248                                      (const __DRIextension **)
1249                                      &pdp->loader_extensions[0],
1250                                      extensions,
1251                                      &driver_configs, psc);
1252    } else {
1253       psc->driScreen =
1254          psc->dri2->createNewScreen(screen, psc->fd,
1255                                     (const __DRIextension **)
1256                                     &pdp->loader_extensions[0],
1257                                     &driver_configs, psc);
1258    }
1259
1260    if (psc->driScreen == NULL) {
1261       ErrorMessageF("failed to create dri screen\n");
1262       goto handle_error;
1263    }
1264
1265    dri2BindExtensions(psc, priv, driverName);
1266
1267    configs = driConvertConfigs(psc->core, psc->base.configs, driver_configs);
1268    visuals = driConvertConfigs(psc->core, psc->base.visuals, driver_configs);
1269
1270    if (!configs || !visuals)
1271        goto handle_error;
1272
1273    glx_config_destroy_list(psc->base.configs);
1274    psc->base.configs = configs;
1275    glx_config_destroy_list(psc->base.visuals);
1276    psc->base.visuals = visuals;
1277
1278    psc->driver_configs = driver_configs;
1279
1280    psc->base.vtable = &dri2_screen_vtable;
1281    psp = &psc->vtable;
1282    psc->base.driScreen = psp;
1283    psp->destroyScreen = dri2DestroyScreen;
1284    psp->createDrawable = dri2CreateDrawable;
1285    psp->swapBuffers = dri2SwapBuffers;
1286    psp->getDrawableMSC = NULL;
1287    psp->waitForMSC = NULL;
1288    psp->waitForSBC = NULL;
1289    psp->setSwapInterval = NULL;
1290    psp->getSwapInterval = NULL;
1291
1292    if (pdp->driMinor >= 2) {
1293       psp->getDrawableMSC = dri2DrawableGetMSC;
1294       psp->waitForMSC = dri2WaitForMSC;
1295       psp->waitForSBC = dri2WaitForSBC;
1296       psp->setSwapInterval = dri2SetSwapInterval;
1297       psp->getSwapInterval = dri2GetSwapInterval;
1298       __glXEnableDirectExtension(&psc->base, "GLX_OML_sync_control");
1299    }
1300
1301    /* DRI2 suports SubBuffer through DRI2CopyRegion, so it's always
1302     * available.*/
1303    psp->copySubBuffer = dri2CopySubBuffer;
1304    __glXEnableDirectExtension(&psc->base, "GLX_MESA_copy_sub_buffer");
1305
1306    free(driverName);
1307    free(deviceName);
1308
1309    tmp = getenv("LIBGL_SHOW_FPS");
1310    psc->show_fps_interval = (tmp) ? atoi(tmp) : 0;
1311    if (psc->show_fps_interval < 0)
1312       psc->show_fps_interval = 0;
1313
1314    return &psc->base;
1315
1316 handle_error:
1317    CriticalErrorMessageF("failed to load driver: %s\n", driverName);
1318
1319    if (configs)
1320        glx_config_destroy_list(configs);
1321    if (visuals)
1322        glx_config_destroy_list(visuals);
1323    if (psc->driScreen)
1324        psc->core->destroyScreen(psc->driScreen);
1325    psc->driScreen = NULL;
1326    if (psc->fd >= 0)
1327       close(psc->fd);
1328    if (psc->driver)
1329       dlclose(psc->driver);
1330
1331    free(driverName);
1332    free(deviceName);
1333    glx_screen_cleanup(&psc->base);
1334    free(psc);
1335
1336    return NULL;
1337 }
1338
1339 /* Called from __glXFreeDisplayPrivate.
1340  */
1341 static void
1342 dri2DestroyDisplay(__GLXDRIdisplay * dpy)
1343 {
1344    struct dri2_display *pdp = (struct dri2_display *) dpy;
1345
1346    __glxHashDestroy(pdp->dri2Hash);
1347    free(dpy);
1348 }
1349
1350 _X_HIDDEN __GLXDRIdrawable *
1351 dri2GetGlxDrawableFromXDrawableId(Display *dpy, XID id)
1352 {
1353    struct glx_display *d = __glXInitialize(dpy);
1354    struct dri2_display *pdp = (struct dri2_display *) d->dri2Display;
1355    __GLXDRIdrawable *pdraw;
1356
1357    if (__glxHashLookup(pdp->dri2Hash, id, (void *) &pdraw) == 0)
1358       return pdraw;
1359
1360    return NULL;
1361 }
1362
1363 /*
1364  * Allocate, initialize and return a __DRIdisplayPrivate object.
1365  * This is called from __glXInitialize() when we are given a new
1366  * display pointer.
1367  */
1368 _X_HIDDEN __GLXDRIdisplay *
1369 dri2CreateDisplay(Display * dpy)
1370 {
1371    struct dri2_display *pdp;
1372    int eventBase, errorBase, i;
1373
1374    if (!DRI2QueryExtension(dpy, &eventBase, &errorBase))
1375       return NULL;
1376
1377    pdp = malloc(sizeof *pdp);
1378    if (pdp == NULL)
1379       return NULL;
1380
1381    if (!DRI2QueryVersion(dpy, &pdp->driMajor, &pdp->driMinor)) {
1382       free(pdp);
1383       return NULL;
1384    }
1385
1386    pdp->driPatch = 0;
1387    pdp->swapAvailable = (pdp->driMinor >= 2);
1388    pdp->invalidateAvailable = (pdp->driMinor >= 3);
1389
1390    pdp->base.destroyDisplay = dri2DestroyDisplay;
1391    pdp->base.createScreen = dri2CreateScreen;
1392
1393    i = 0;
1394    if (pdp->driMinor < 1)
1395       pdp->loader_extensions[i++] = &dri2LoaderExtension_old.base;
1396    else
1397       pdp->loader_extensions[i++] = &dri2LoaderExtension.base;
1398
1399    pdp->loader_extensions[i++] = &systemTimeExtension.base;
1400
1401    pdp->loader_extensions[i++] = &dri2UseInvalidate.base;
1402
1403    pdp->loader_extensions[i++] = NULL;
1404
1405    pdp->dri2Hash = __glxHashCreate();
1406    if (pdp->dri2Hash == NULL) {
1407       free(pdp);
1408       return NULL;
1409    }
1410
1411    return &pdp->base;
1412 }
1413
1414 #endif /* GLX_DIRECT_RENDERING */