src/glx/drisw_glx.c

   1 /*
   2  * Copyright 2008 George Sapountzis
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23
  24 #if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
  25
  26 #include <X11/Xlib.h>
  27 #include "glxclient.h"
  28 #include <dlfcn.h>
  29 #include "dri_common.h"
  30
  31 struct drisw_display
  32 {
  33    __GLXDRIdisplay base;
  34 };
  35
  36 struct drisw_context
  37 {
  38    struct glx_context base;
  39    __DRIcontext *driContext;
  40
  41 };
  42
  43 struct drisw_screen
  44 {
  45    struct glx_screen base;
  46
  47    __DRIscreen *driScreen;
  48    __GLXDRIscreen vtable;
  49    const __DRIcoreExtension *core;
  50    const __DRIswrastExtension *swrast;
  51    const __DRItexBufferExtension *texBuffer;
  52
  53    const __DRIconfig **driver_configs;
  54
  55    void *driver;
  56 };
  57
  58 struct drisw_drawable
  59 {
  60    __GLXDRIdrawable base;
  61
  62    GC gc;
  63    GC swapgc;
  64
  65    __DRIdrawable *driDrawable;
  66    XVisualInfo *visinfo;
  67    XImage *ximage;
  68 };
  69
  70 static Bool
  71 XCreateDrawable(struct drisw_drawable * pdp,
  72                 Display * dpy, XID drawable, int visualid)
  73 {
  74    XGCValues gcvalues;
  75    long visMask;
  76    XVisualInfo visTemp;
  77    int num_visuals;
  78
  79    /* create GC's */
  80    pdp->gc = XCreateGC(dpy, drawable, 0, NULL);
  81    pdp->swapgc = XCreateGC(dpy, drawable, 0, NULL);
  82
  83    gcvalues.function = GXcopy;
  84    gcvalues.graphics_exposures = False;
  85    XChangeGC(dpy, pdp->gc, GCFunction, &gcvalues);
  86    XChangeGC(dpy, pdp->swapgc, GCFunction, &gcvalues);
  87    XChangeGC(dpy, pdp->swapgc, GCGraphicsExposures, &gcvalues);
  88
  89    /* visual */
  90    visTemp.visualid = visualid;
  91    visMask = VisualIDMask;
  92    pdp->visinfo = XGetVisualInfo(dpy, visMask, &visTemp, &num_visuals);
  93
  94    if (!pdp->visinfo || num_visuals == 0)
  95       return False;
  96
  97    /* create XImage */
  98    pdp->ximage = XCreateImage(dpy,
  99                               pdp->visinfo->visual,
 100                               pdp->visinfo->depth,
 101                               ZPixmap, 0,             /* format, offset */
 102                               NULL,                   /* data */
 103                               0, 0,                   /* width, height */
 104                               32,                     /* bitmap_pad */
 105                               0);                     /* bytes_per_line */
 106
 107   /**
 108    * swrast does not handle 24-bit depth with 24 bpp, so let X do the
 109    * the conversion for us.
 110    */
 111   if (pdp->ximage->bits_per_pixel == 24)
 112      pdp->ximage->bits_per_pixel = 32;
 113
 114    return True;
 115 }
 116
 117 static void
 118 XDestroyDrawable(struct drisw_drawable * pdp, Display * dpy, XID drawable)
 119 {
 120    XDestroyImage(pdp->ximage);
 121    XFree(pdp->visinfo);
 122
 123    XFreeGC(dpy, pdp->gc);
 124    XFreeGC(dpy, pdp->swapgc);
 125 }
 126
 127 /**
 128  * swrast loader functions
 129  */
 130
 131 static void
 132 swrastGetDrawableInfo(__DRIdrawable * draw,
 133                       int *x, int *y, int *w, int *h,
 134                       void *loaderPrivate)
 135 {
 136    struct drisw_drawable *pdp = loaderPrivate;
 137    __GLXDRIdrawable *pdraw = &(pdp->base);
 138    Display *dpy = pdraw->psc->dpy;
 139    Drawable drawable;
 140
 141    Window root;
 142    unsigned uw, uh, bw, depth;
 143
 144    drawable = pdraw->xDrawable;
 145
 146    XGetGeometry(dpy, drawable, &root, x, y, &uw, &uh, &bw, &depth);
 147    *w = uw;
 148    *h = uh;
 149 }
 150
 151 /**
 152  * Align renderbuffer pitch.
 153  *
 154  * This should be chosen by the driver and the loader (libGL, xserver/glx)
 155  * should use the driver provided pitch.
 156  *
 157  * It seems that the xorg loader (that is the xserver loading swrast_dri for
 158  * indirect rendering, not client-side libGL) requires that the pitch is
 159  * exactly the image width padded to 32 bits. XXX
 160  *
 161  * The above restriction can probably be overcome by using ScratchPixmap and
 162  * CopyArea in the xserver, similar to ShmPutImage, and setting the width of
 163  * the scratch pixmap to 'pitch / cpp'.
 164  */
 165 static inline int
 166 bytes_per_line(unsigned pitch_bits, unsigned mul)
 167 {
 168    unsigned mask = mul - 1;
 169
 170    return ((pitch_bits + mask) & ~mask) / 8;
 171 }
 172
 173 static void
 174 swrastPutImage(__DRIdrawable * draw, int op,
 175                int x, int y, int w, int h,
 176                char *data, void *loaderPrivate)
 177 {
 178    struct drisw_drawable *pdp = loaderPrivate;
 179    __GLXDRIdrawable *pdraw = &(pdp->base);
 180    Display *dpy = pdraw->psc->dpy;
 181    Drawable drawable;
 182    XImage *ximage;
 183    GC gc;
 184
 185    switch (op) {
 186    case __DRI_SWRAST_IMAGE_OP_DRAW:
 187       gc = pdp->gc;
 188       break;
 189    case __DRI_SWRAST_IMAGE_OP_SWAP:
 190       gc = pdp->swapgc;
 191       break;
 192    default:
 193       return;
 194    }
 195
 196    drawable = pdraw->xDrawable;
 197
 198    ximage = pdp->ximage;
 199    ximage->data = data;
 200    ximage->width = w;
 201    ximage->height = h;
 202    ximage->bytes_per_line = bytes_per_line(w * ximage->bits_per_pixel, 32);
 203
 204    XPutImage(dpy, drawable, gc, ximage, 0, 0, x, y, w, h);
 205
 206    ximage->data = NULL;
 207 }
 208
 209 static void
 210 swrastGetImage(__DRIdrawable * read,
 211                int x, int y, int w, int h,
 212                char *data, void *loaderPrivate)
 213 {
 214    struct drisw_drawable *prp = loaderPrivate;
 215    __GLXDRIdrawable *pread = &(prp->base);
 216    Display *dpy = pread->psc->dpy;
 217    Drawable readable;
 218    XImage *ximage;
 219
 220    readable = pread->xDrawable;
 221
 222    ximage = prp->ximage;
 223    ximage->data = data;
 224    ximage->width = w;
 225    ximage->height = h;
 226    ximage->bytes_per_line = bytes_per_line(w * ximage->bits_per_pixel, 32);
 227
 228    XGetSubImage(dpy, readable, x, y, w, h, ~0L, ZPixmap, ximage, 0, 0);
 229
 230    ximage->data = NULL;
 231 }
 232
 233 static const __DRIswrastLoaderExtension swrastLoaderExtension = {
 234    {__DRI_SWRAST_LOADER, __DRI_SWRAST_LOADER_VERSION},
 235    swrastGetDrawableInfo,
 236    swrastPutImage,
 237    swrastGetImage
 238 };
 239
 240 static const __DRIextension *loader_extensions[] = {
 241    &systemTimeExtension.base,
 242    &swrastLoaderExtension.base,
 243    NULL
 244 };
 245
 246 /**
 247  * GLXDRI functions
 248  */
 249
 250 static void
 251 drisw_destroy_context(struct glx_context *context)
 252 {
 253    struct drisw_context *pcp = (struct drisw_context *) context;
 254    struct drisw_screen *psc = (struct drisw_screen *) context->psc;
 255
 256    driReleaseDrawables(&pcp->base);
 257
 258    if (context->extensions)
 259       XFree((char *) context->extensions);
 260
 261    (*psc->core->destroyContext) (pcp->driContext);
 262
 263    Xfree(pcp);
 264 }
 265
 266 static int
 267 drisw_bind_context(struct glx_context *context, struct glx_context *old,
 268                    GLXDrawable draw, GLXDrawable read)
 269 {
 270    struct drisw_context *pcp = (struct drisw_context *) context;
 271    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 272    struct drisw_drawable *pdraw, *pread;
 273
 274    pdraw = (struct drisw_drawable *) driFetchDrawable(context, draw);
 275    pread = (struct drisw_drawable *) driFetchDrawable(context, read);
 276
 277    driReleaseDrawables(&pcp->base);
 278
 279    if (pdraw == NULL || pread == NULL)
 280       return GLXBadDrawable;
 281
 282    if ((*psc->core->bindContext) (pcp->driContext,
 283                                   pdraw->driDrawable, pread->driDrawable))
 284       return Success;
 285
 286    return GLXBadContext;
 287 }
 288
 289 static void
 290 drisw_unbind_context(struct glx_context *context, struct glx_context *new)
 291 {
 292    struct drisw_context *pcp = (struct drisw_context *) context;
 293    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 294
 295    (*psc->core->unbindContext) (pcp->driContext);
 296 }
 297
 298 static void
 299 drisw_bind_tex_image(Display * dpy,
 300                     GLXDrawable drawable,
 301                     int buffer, const int *attrib_list)
 302 {
 303    struct glx_context *gc = __glXGetCurrentContext();
 304    struct drisw_context *pcp = (struct drisw_context *) gc;
 305    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 306    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 307    struct drisw_screen *psc;
 308
 309    __glXInitialize(dpy);
 310
 311    if (pdraw != NULL) {
 312       psc = (struct drisw_screen *) base->psc;
 313
 314       if (!psc->texBuffer)
 315          return;
 316
 317       if (psc->texBuffer->base.version >= 2 &&
 318         psc->texBuffer->setTexBuffer2 != NULL) {
 319               (*psc->texBuffer->setTexBuffer2) (pcp->driContext,
 320                                            pdraw->base.textureTarget,
 321                                            pdraw->base.textureFormat,
 322                                            pdraw->driDrawable);
 323       }
 324       else {
 325               (*psc->texBuffer->setTexBuffer) (pcp->driContext,
 326                                           pdraw->base.textureTarget,
 327                                           pdraw->driDrawable);
 328       }
 329    }
 330 }
 331
 332 static void
 333 drisw_release_tex_image(Display * dpy, GLXDrawable drawable, int buffer)
 334 {
 335 #if __DRI_TEX_BUFFER_VERSION >= 3
 336    struct glx_context *gc = __glXGetCurrentContext();
 337    struct dri2_context *pcp = (struct dri2_context *) gc;
 338    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 339    struct glx_display *dpyPriv = __glXInitialize(dpy);
 340    struct dri2_drawable *pdraw = (struct dri2_drawable *) base;
 341    struct dri2_screen *psc;
 342
 343    if (pdraw != NULL) {
 344       psc = (struct dri2_screen *) base->psc;
 345
 346       if (!psc->texBuffer)
 347          return;
 348
 349       if (psc->texBuffer->base.version >= 3 &&
 350           psc->texBuffer->releaseTexBuffer != NULL) {
 351          (*psc->texBuffer->releaseTexBuffer) (pcp->driContext,
 352                                            pdraw->base.textureTarget,
 353                                            pdraw->driDrawable);
 354       }
 355    }
 356 #endif
 357 }
 358
 359 static const struct glx_context_vtable drisw_context_vtable = {
 360    drisw_destroy_context,
 361    drisw_bind_context,
 362    drisw_unbind_context,
 363    NULL,
 364    NULL,
 365    DRI_glXUseXFont,
 366    drisw_bind_tex_image,
 367    drisw_release_tex_image,
 368    NULL, /* get_proc_address */
 369 };
 370
 371 static struct glx_context *
 372 drisw_create_context(struct glx_screen *base,
 373                      struct glx_config *config_base,
 374                      struct glx_context *shareList, int renderType)
 375 {
 376    struct drisw_context *pcp, *pcp_shared;
 377    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 378    struct drisw_screen *psc = (struct drisw_screen *) base;
 379    __DRIcontext *shared = NULL;
 380
 381    if (!psc->base.driScreen)
 382       return NULL;
 383
 384    if (shareList) {
 385       /* If the shareList context is not a DRISW context, we cannot possibly
 386        * create a DRISW context that shares it.
 387        */
 388       if (shareList->vtable->destroy != drisw_destroy_context) {
 389          return NULL;
 390       }
 391
 392       pcp_shared = (struct drisw_context *) shareList;
 393       shared = pcp_shared->driContext;
 394    }
 395
 396    pcp = Xmalloc(sizeof *pcp);
 397    if (pcp == NULL)
 398       return NULL;
 399
 400    memset(pcp, 0, sizeof *pcp);
 401    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 402       Xfree(pcp);
 403       return NULL;
 404    }
 405
 406    pcp->driContext =
 407       (*psc->core->createNewContext) (psc->driScreen,
 408                                       config->driConfig, shared, pcp);
 409    if (pcp->driContext == NULL) {
 410       Xfree(pcp);
 411       return NULL;
 412    }
 413
 414    pcp->base.vtable = &drisw_context_vtable;
 415
 416    return &pcp->base;
 417 }
 418
 419 static struct glx_context *
 420 drisw_create_context_attribs(struct glx_screen *base,
 421                              struct glx_config *config_base,
 422                              struct glx_context *shareList,
 423                              unsigned num_attribs,
 424                              const uint32_t *attribs,
 425                              unsigned *error)
 426 {
 427    struct drisw_context *pcp, *pcp_shared;
 428    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 429    struct drisw_screen *psc = (struct drisw_screen *) base;
 430    __DRIcontext *shared = NULL;
 431
 432    uint32_t minor_ver = 1;
 433    uint32_t major_ver = 0;
 434    uint32_t flags = 0;
 435    unsigned api;
 436    uint32_t ctx_attribs[2 * 4];
 437    unsigned num_ctx_attribs = 0;
 438
 439    if (!psc->base.driScreen)
 440       return NULL;
 441
 442    if (psc->swrast->base.version < 3)
 443       return NULL;
 444
 445    /* Remap the GLX tokens to DRI2 tokens.
 446     */
 447    if (!dri2_convert_glx_attribs(num_attribs, attribs,
 448                                  &major_ver, &minor_ver, &flags, &api,
 449                                  error))
 450       return NULL;
 451
 452    if (shareList) {
 453       pcp_shared = (struct drisw_context *) shareList;
 454       shared = pcp_shared->driContext;
 455    }
 456
 457    pcp = Xmalloc(sizeof *pcp);
 458    if (pcp == NULL)
 459       return NULL;
 460
 461    memset(pcp, 0, sizeof *pcp);
 462    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 463       Xfree(pcp);
 464       return NULL;
 465    }
 466
 467    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MAJOR_VERSION;
 468    ctx_attribs[num_ctx_attribs++] = major_ver;
 469    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MINOR_VERSION;
 470    ctx_attribs[num_ctx_attribs++] = minor_ver;
 471
 472    if (flags != 0) {
 473       ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_FLAGS;
 474
 475       /* The current __DRI_CTX_FLAG_* values are identical to the
 476        * GLX_CONTEXT_*_BIT values.
 477        */
 478       ctx_attribs[num_ctx_attribs++] = flags;
 479    }
 480
 481    pcp->driContext =
 482       (*psc->swrast->createContextAttribs) (psc->driScreen,
 483                                             api,
 484                                             config->driConfig,
 485                                             shared,
 486                                             num_ctx_attribs / 2,
 487                                             ctx_attribs,
 488                                             error,
 489                                             pcp);
 490    if (pcp->driContext == NULL) {
 491       Xfree(pcp);
 492       return NULL;
 493    }
 494
 495    pcp->base.vtable = &drisw_context_vtable;
 496
 497    return &pcp->base;
 498 }
 499
 500 static void
 501 driswDestroyDrawable(__GLXDRIdrawable * pdraw)
 502 {
 503    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 504    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 505
 506    (*psc->core->destroyDrawable) (pdp->driDrawable);
 507
 508    XDestroyDrawable(pdp, pdraw->psc->dpy, pdraw->drawable);
 509    Xfree(pdp);
 510 }
 511
 512 static __GLXDRIdrawable *
 513 driswCreateDrawable(struct glx_screen *base, XID xDrawable,
 514                     GLXDrawable drawable, struct glx_config *modes)
 515 {
 516    struct drisw_drawable *pdp;
 517    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) modes;
 518    struct drisw_screen *psc = (struct drisw_screen *) base;
 519    Bool ret;
 520    const __DRIswrastExtension *swrast = psc->swrast;
 521
 522    pdp = Xmalloc(sizeof(*pdp));
 523    if (!pdp)
 524       return NULL;
 525
 526    memset(pdp, 0, sizeof *pdp);
 527    pdp->base.xDrawable = xDrawable;
 528    pdp->base.drawable = drawable;
 529    pdp->base.psc = &psc->base;
 530
 531    ret = XCreateDrawable(pdp, psc->base.dpy, xDrawable, modes->visualID);
 532    if (!ret) {
 533       Xfree(pdp);
 534       return NULL;
 535    }
 536
 537    /* Create a new drawable */
 538    pdp->driDrawable =
 539       (*swrast->createNewDrawable) (psc->driScreen, config->driConfig, pdp);
 540
 541    if (!pdp->driDrawable) {
 542       XDestroyDrawable(pdp, psc->base.dpy, xDrawable);
 543       Xfree(pdp);
 544       return NULL;
 545    }
 546
 547    pdp->base.destroyDrawable = driswDestroyDrawable;
 548
 549    return &pdp->base;
 550 }
 551
 552 static int64_t
 553 driswSwapBuffers(__GLXDRIdrawable * pdraw,
 554                  int64_t target_msc, int64_t divisor, int64_t remainder)
 555 {
 556    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 557    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 558
 559    (void) target_msc;
 560    (void) divisor;
 561    (void) remainder;
 562
 563    (*psc->core->swapBuffers) (pdp->driDrawable);
 564
 565    return 0;
 566 }
 567
 568 static void
 569 driswDestroyScreen(struct glx_screen *base)
 570 {
 571    struct drisw_screen *psc = (struct drisw_screen *) base;
 572
 573    /* Free the direct rendering per screen data */
 574    (*psc->core->destroyScreen) (psc->driScreen);
 575    driDestroyConfigs(psc->driver_configs);
 576    psc->driScreen = NULL;
 577    if (psc->driver)
 578       dlclose(psc->driver);
 579 }
 580
 581 #define SWRAST_DRIVER_NAME "swrast"
 582
 583 static void *
 584 driOpenSwrast(void)
 585 {
 586    void *driver = NULL;
 587
 588    if (driver == NULL)
 589       driver = driOpenDriver(SWRAST_DRIVER_NAME);
 590
 591    return driver;
 592 }
 593
 594 static const struct glx_screen_vtable drisw_screen_vtable = {
 595    drisw_create_context,
 596    drisw_create_context_attribs
 597 };
 598
 599 static void
 600 driswBindExtensions(struct drisw_screen *psc, const __DRIextension **extensions)
 601 {
 602    int i;
 603
 604    __glXEnableDirectExtension(&psc->base, "GLX_SGI_make_current_read");
 605
 606    if (psc->swrast->base.version >= 3) {
 607       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
 608       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context_profile");
 609
 610       /* DRISW version >= 2 implies support for OpenGL ES 2.0.
 611        */
 612       __glXEnableDirectExtension(&psc->base,
 613                                  "GLX_EXT_create_context_es2_profile");
 614    }
 615
 616    /* FIXME: Figure out what other extensions can be ported here from dri2. */
 617    for (i = 0; extensions[i]; i++) {
 618       if ((strcmp(extensions[i]->name, __DRI_TEX_BUFFER) == 0)) {
 619          psc->texBuffer = (__DRItexBufferExtension *) extensions[i];
 620          __glXEnableDirectExtension(&psc->base, "GLX_EXT_texture_from_pixmap");
 621       }
 622    }
 623 }
 624
 625 static struct glx_screen *
 626 driswCreateScreen(int screen, struct glx_display *priv)
 627 {
 628    __GLXDRIscreen *psp;
 629    const __DRIconfig **driver_configs;
 630    const __DRIextension **extensions;
 631    struct drisw_screen *psc;
 632    struct glx_config *configs = NULL, *visuals = NULL;
 633    int i;
 634
 635    psc = Xcalloc(1, sizeof *psc);
 636    if (psc == NULL)
 637       return NULL;
 638
 639    memset(psc, 0, sizeof *psc);
 640    if (!glx_screen_init(&psc->base, screen, priv)) {
 641       Xfree(psc);
 642       return NULL;
 643    }
 644
 645    psc->driver = driOpenSwrast();
 646    if (psc->driver == NULL)
 647       goto handle_error;
 648
 649    extensions = dlsym(psc->driver, __DRI_DRIVER_EXTENSIONS);
 650    if (extensions == NULL) {
 651       ErrorMessageF("driver exports no extensions (%s)\n", dlerror());
 652       goto handle_error;
 653    }
 654
 655    for (i = 0; extensions[i]; i++) {
 656       if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
 657          psc->core = (__DRIcoreExtension *) extensions[i];
 658       if (strcmp(extensions[i]->name, __DRI_SWRAST) == 0)
 659          psc->swrast = (__DRIswrastExtension *) extensions[i];
 660    }
 661
 662    if (psc->core == NULL || psc->swrast == NULL) {
 663       ErrorMessageF("core dri extension not found\n");
 664       goto handle_error;
 665    }
 666
 667    psc->driScreen =
 668       psc->swrast->createNewScreen(screen, loader_extensions,
 669                                    &driver_configs, psc);
 670    if (psc->driScreen == NULL) {
 671       ErrorMessageF("failed to create dri screen\n");
 672       goto handle_error;
 673    }
 674
 675    extensions = psc->core->getExtensions(psc->driScreen);
 676    driswBindExtensions(psc, extensions);
 677
 678    configs = driConvertConfigs(psc->core, psc->base.configs, driver_configs);
 679    visuals = driConvertConfigs(psc->core, psc->base.visuals, driver_configs);
 680
 681    if (!configs || !visuals)
 682        goto handle_error;
 683
 684    glx_config_destroy_list(psc->base.configs);
 685    psc->base.configs = configs;
 686    glx_config_destroy_list(psc->base.visuals);
 687    psc->base.visuals = visuals;
 688
 689    psc->driver_configs = driver_configs;
 690
 691    psc->base.vtable = &drisw_screen_vtable;
 692    psp = &psc->vtable;
 693    psc->base.driScreen = psp;
 694    psp->destroyScreen = driswDestroyScreen;
 695    psp->createDrawable = driswCreateDrawable;
 696    psp->swapBuffers = driswSwapBuffers;
 697
 698    return &psc->base;
 699
 700  handle_error:
 701    if (configs)
 702        glx_config_destroy_list(configs);
 703    if (visuals)
 704        glx_config_destroy_list(visuals);
 705    if (psc->driScreen)
 706        psc->core->destroyScreen(psc->driScreen);
 707    psc->driScreen = NULL;
 708
 709    if (psc->driver)
 710       dlclose(psc->driver);
 711    glx_screen_cleanup(&psc->base);
 712    Xfree(psc);
 713
 714    CriticalErrorMessageF("failed to load driver: %s\n", SWRAST_DRIVER_NAME);
 715
 716    return NULL;
 717 }
 718
 719 /* Called from __glXFreeDisplayPrivate.
 720  */
 721 static void
 722 driswDestroyDisplay(__GLXDRIdisplay * dpy)
 723 {
 724    Xfree(dpy);
 725 }
 726
 727 /*
 728  * Allocate, initialize and return a __DRIdisplayPrivate object.
 729  * This is called from __glXInitialize() when we are given a new
 730  * display pointer.
 731  */
 732 _X_HIDDEN __GLXDRIdisplay *
 733 driswCreateDisplay(Display * dpy)
 734 {
 735    struct drisw_display *pdpyp;
 736
 737    pdpyp = Xmalloc(sizeof *pdpyp);
 738    if (pdpyp == NULL)
 739       return NULL;
 740
 741    pdpyp->base.destroyDisplay = driswDestroyDisplay;
 742    pdpyp->base.createScreen = driswCreateScreen;
 743
 744    return &pdpyp->base;
 745 }
 746
 747 #endif /* GLX_DIRECT_RENDERING */