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    free(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    free((char *) context->extensions);
 259
 260    (*psc->core->destroyContext) (pcp->driContext);
 261
 262    free(pcp);
 263 }
 264
 265 static int
 266 drisw_bind_context(struct glx_context *context, struct glx_context *old,
 267                    GLXDrawable draw, GLXDrawable read)
 268 {
 269    struct drisw_context *pcp = (struct drisw_context *) context;
 270    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 271    struct drisw_drawable *pdraw, *pread;
 272
 273    pdraw = (struct drisw_drawable *) driFetchDrawable(context, draw);
 274    pread = (struct drisw_drawable *) driFetchDrawable(context, read);
 275
 276    driReleaseDrawables(&pcp->base);
 277
 278    if (pdraw == NULL || pread == NULL)
 279       return GLXBadDrawable;
 280
 281    if ((*psc->core->bindContext) (pcp->driContext,
 282                                   pdraw->driDrawable, pread->driDrawable))
 283       return Success;
 284
 285    return GLXBadContext;
 286 }
 287
 288 static void
 289 drisw_unbind_context(struct glx_context *context, struct glx_context *new)
 290 {
 291    struct drisw_context *pcp = (struct drisw_context *) context;
 292    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 293
 294    (*psc->core->unbindContext) (pcp->driContext);
 295 }
 296
 297 static void
 298 drisw_bind_tex_image(Display * dpy,
 299                     GLXDrawable drawable,
 300                     int buffer, const int *attrib_list)
 301 {
 302    struct glx_context *gc = __glXGetCurrentContext();
 303    struct drisw_context *pcp = (struct drisw_context *) gc;
 304    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 305    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 306    struct drisw_screen *psc;
 307
 308    __glXInitialize(dpy);
 309
 310    if (pdraw != NULL) {
 311       psc = (struct drisw_screen *) base->psc;
 312
 313       if (!psc->texBuffer)
 314          return;
 315
 316       if (psc->texBuffer->base.version >= 2 &&
 317         psc->texBuffer->setTexBuffer2 != NULL) {
 318               (*psc->texBuffer->setTexBuffer2) (pcp->driContext,
 319                                            pdraw->base.textureTarget,
 320                                            pdraw->base.textureFormat,
 321                                            pdraw->driDrawable);
 322       }
 323       else {
 324               (*psc->texBuffer->setTexBuffer) (pcp->driContext,
 325                                           pdraw->base.textureTarget,
 326                                           pdraw->driDrawable);
 327       }
 328    }
 329 }
 330
 331 static void
 332 drisw_release_tex_image(Display * dpy, GLXDrawable drawable, int buffer)
 333 {
 334 #if __DRI_TEX_BUFFER_VERSION >= 3
 335    struct glx_context *gc = __glXGetCurrentContext();
 336    struct dri2_context *pcp = (struct dri2_context *) gc;
 337    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 338    struct glx_display *dpyPriv = __glXInitialize(dpy);
 339    struct dri2_drawable *pdraw = (struct dri2_drawable *) base;
 340    struct dri2_screen *psc;
 341
 342    if (pdraw != NULL) {
 343       psc = (struct dri2_screen *) base->psc;
 344
 345       if (!psc->texBuffer)
 346          return;
 347
 348       if (psc->texBuffer->base.version >= 3 &&
 349           psc->texBuffer->releaseTexBuffer != NULL) {
 350          (*psc->texBuffer->releaseTexBuffer) (pcp->driContext,
 351                                            pdraw->base.textureTarget,
 352                                            pdraw->driDrawable);
 353       }
 354    }
 355 #endif
 356 }
 357
 358 static const struct glx_context_vtable drisw_context_vtable = {
 359    drisw_destroy_context,
 360    drisw_bind_context,
 361    drisw_unbind_context,
 362    NULL,
 363    NULL,
 364    DRI_glXUseXFont,
 365    drisw_bind_tex_image,
 366    drisw_release_tex_image,
 367    NULL, /* get_proc_address */
 368 };
 369
 370 static struct glx_context *
 371 drisw_create_context(struct glx_screen *base,
 372                      struct glx_config *config_base,
 373                      struct glx_context *shareList, int renderType)
 374 {
 375    struct drisw_context *pcp, *pcp_shared;
 376    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 377    struct drisw_screen *psc = (struct drisw_screen *) base;
 378    __DRIcontext *shared = NULL;
 379
 380    if (!psc->base.driScreen)
 381       return NULL;
 382
 383    /* Check the renderType value */
 384    if (!validate_renderType_against_config(config_base, renderType))
 385        return NULL;
 386
 387    if (shareList) {
 388       /* If the shareList context is not a DRISW context, we cannot possibly
 389        * create a DRISW context that shares it.
 390        */
 391       if (shareList->vtable->destroy != drisw_destroy_context) {
 392          return NULL;
 393       }
 394
 395       pcp_shared = (struct drisw_context *) shareList;
 396       shared = pcp_shared->driContext;
 397    }
 398
 399    pcp = calloc(1, sizeof *pcp);
 400    if (pcp == NULL)
 401       return NULL;
 402
 403    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 404       free(pcp);
 405       return NULL;
 406    }
 407
 408    pcp->base.renderType = renderType;
 409
 410    pcp->driContext =
 411       (*psc->core->createNewContext) (psc->driScreen,
 412                                       config->driConfig, shared, pcp);
 413    if (pcp->driContext == NULL) {
 414       free(pcp);
 415       return NULL;
 416    }
 417
 418    pcp->base.vtable = &drisw_context_vtable;
 419
 420    return &pcp->base;
 421 }
 422
 423 static struct glx_context *
 424 drisw_create_context_attribs(struct glx_screen *base,
 425                              struct glx_config *config_base,
 426                              struct glx_context *shareList,
 427                              unsigned num_attribs,
 428                              const uint32_t *attribs,
 429                              unsigned *error)
 430 {
 431    struct drisw_context *pcp, *pcp_shared;
 432    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 433    struct drisw_screen *psc = (struct drisw_screen *) base;
 434    __DRIcontext *shared = NULL;
 435
 436    uint32_t minor_ver;
 437    uint32_t major_ver;
 438    uint32_t renderType;
 439    uint32_t flags;
 440    unsigned api;
 441    int reset;
 442    uint32_t ctx_attribs[2 * 4];
 443    unsigned num_ctx_attribs = 0;
 444
 445    if (!psc->base.driScreen)
 446       return NULL;
 447
 448    if (psc->swrast->base.version < 3)
 449       return NULL;
 450
 451    /* Remap the GLX tokens to DRI2 tokens.
 452     */
 453    if (!dri2_convert_glx_attribs(num_attribs, attribs,
 454                                  &major_ver, &minor_ver, &renderType, &flags,
 455                                  &api, &reset, error))
 456       return NULL;
 457
 458    /* Check the renderType value */
 459    if (!validate_renderType_against_config(config_base, renderType)) {
 460        return NULL;
 461    }
 462
 463    if (reset != __DRI_CTX_RESET_NO_NOTIFICATION)
 464       return NULL;
 465
 466    if (shareList) {
 467       pcp_shared = (struct drisw_context *) shareList;
 468       shared = pcp_shared->driContext;
 469    }
 470
 471    pcp = calloc(1, sizeof *pcp);
 472    if (pcp == NULL)
 473       return NULL;
 474
 475    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 476       free(pcp);
 477       return NULL;
 478    }
 479
 480    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MAJOR_VERSION;
 481    ctx_attribs[num_ctx_attribs++] = major_ver;
 482    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MINOR_VERSION;
 483    ctx_attribs[num_ctx_attribs++] = minor_ver;
 484
 485    if (flags != 0) {
 486       ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_FLAGS;
 487
 488       /* The current __DRI_CTX_FLAG_* values are identical to the
 489        * GLX_CONTEXT_*_BIT values.
 490        */
 491       ctx_attribs[num_ctx_attribs++] = flags;
 492    }
 493
 494    pcp->base.renderType = renderType;
 495
 496    pcp->driContext =
 497       (*psc->swrast->createContextAttribs) (psc->driScreen,
 498                                             api,
 499                                             config->driConfig,
 500                                             shared,
 501                                             num_ctx_attribs / 2,
 502                                             ctx_attribs,
 503                                             error,
 504                                             pcp);
 505    if (pcp->driContext == NULL) {
 506       free(pcp);
 507       return NULL;
 508    }
 509
 510    pcp->base.vtable = &drisw_context_vtable;
 511
 512    return &pcp->base;
 513 }
 514
 515 static void
 516 driswDestroyDrawable(__GLXDRIdrawable * pdraw)
 517 {
 518    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 519    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 520
 521    (*psc->core->destroyDrawable) (pdp->driDrawable);
 522
 523    XDestroyDrawable(pdp, pdraw->psc->dpy, pdraw->drawable);
 524    free(pdp);
 525 }
 526
 527 static __GLXDRIdrawable *
 528 driswCreateDrawable(struct glx_screen *base, XID xDrawable,
 529                     GLXDrawable drawable, struct glx_config *modes)
 530 {
 531    struct drisw_drawable *pdp;
 532    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) modes;
 533    struct drisw_screen *psc = (struct drisw_screen *) base;
 534    Bool ret;
 535    const __DRIswrastExtension *swrast = psc->swrast;
 536
 537    pdp = calloc(1, sizeof(*pdp));
 538    if (!pdp)
 539       return NULL;
 540
 541    pdp->base.xDrawable = xDrawable;
 542    pdp->base.drawable = drawable;
 543    pdp->base.psc = &psc->base;
 544
 545    ret = XCreateDrawable(pdp, psc->base.dpy, xDrawable, modes->visualID);
 546    if (!ret) {
 547       free(pdp);
 548       return NULL;
 549    }
 550
 551    /* Create a new drawable */
 552    pdp->driDrawable =
 553       (*swrast->createNewDrawable) (psc->driScreen, config->driConfig, pdp);
 554
 555    if (!pdp->driDrawable) {
 556       XDestroyDrawable(pdp, psc->base.dpy, xDrawable);
 557       free(pdp);
 558       return NULL;
 559    }
 560
 561    pdp->base.destroyDrawable = driswDestroyDrawable;
 562
 563    return &pdp->base;
 564 }
 565
 566 static int64_t
 567 driswSwapBuffers(__GLXDRIdrawable * pdraw,
 568                  int64_t target_msc, int64_t divisor, int64_t remainder,
 569                  Bool flush)
 570 {
 571    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 572    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 573
 574    (void) target_msc;
 575    (void) divisor;
 576    (void) remainder;
 577
 578    if (flush) {
 579       glFlush();
 580    }
 581
 582    (*psc->core->swapBuffers) (pdp->driDrawable);
 583
 584    return 0;
 585 }
 586
 587 static void
 588 driswDestroyScreen(struct glx_screen *base)
 589 {
 590    struct drisw_screen *psc = (struct drisw_screen *) base;
 591
 592    /* Free the direct rendering per screen data */
 593    (*psc->core->destroyScreen) (psc->driScreen);
 594    driDestroyConfigs(psc->driver_configs);
 595    psc->driScreen = NULL;
 596    if (psc->driver)
 597       dlclose(psc->driver);
 598 }
 599
 600 #define SWRAST_DRIVER_NAME "swrast"
 601
 602 static void *
 603 driOpenSwrast(void)
 604 {
 605    void *driver = NULL;
 606
 607    if (driver == NULL)
 608       driver = driOpenDriver(SWRAST_DRIVER_NAME);
 609
 610    return driver;
 611 }
 612
 613 static const struct glx_screen_vtable drisw_screen_vtable = {
 614    drisw_create_context,
 615    drisw_create_context_attribs
 616 };
 617
 618 static void
 619 driswBindExtensions(struct drisw_screen *psc, const __DRIextension **extensions)
 620 {
 621    int i;
 622
 623    __glXEnableDirectExtension(&psc->base, "GLX_SGI_make_current_read");
 624
 625    if (psc->swrast->base.version >= 3) {
 626       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
 627       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context_profile");
 628
 629       /* DRISW version >= 2 implies support for OpenGL ES 2.0.
 630        */
 631       __glXEnableDirectExtension(&psc->base,
 632                                  "GLX_EXT_create_context_es2_profile");
 633    }
 634
 635    /* FIXME: Figure out what other extensions can be ported here from dri2. */
 636    for (i = 0; extensions[i]; i++) {
 637       if ((strcmp(extensions[i]->name, __DRI_TEX_BUFFER) == 0)) {
 638          psc->texBuffer = (__DRItexBufferExtension *) extensions[i];
 639          __glXEnableDirectExtension(&psc->base, "GLX_EXT_texture_from_pixmap");
 640       }
 641    }
 642 }
 643
 644 static struct glx_screen *
 645 driswCreateScreen(int screen, struct glx_display *priv)
 646 {
 647    __GLXDRIscreen *psp;
 648    const __DRIconfig **driver_configs;
 649    const __DRIextension **extensions;
 650    struct drisw_screen *psc;
 651    struct glx_config *configs = NULL, *visuals = NULL;
 652    int i;
 653
 654    psc = calloc(1, sizeof *psc);
 655    if (psc == NULL)
 656       return NULL;
 657
 658    if (!glx_screen_init(&psc->base, screen, priv)) {
 659       free(psc);
 660       return NULL;
 661    }
 662
 663    psc->driver = driOpenSwrast();
 664    if (psc->driver == NULL)
 665       goto handle_error;
 666
 667    extensions = dlsym(psc->driver, __DRI_DRIVER_EXTENSIONS);
 668    if (extensions == NULL) {
 669       ErrorMessageF("driver exports no extensions (%s)\n", dlerror());
 670       goto handle_error;
 671    }
 672
 673    for (i = 0; extensions[i]; i++) {
 674       if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
 675          psc->core = (__DRIcoreExtension *) extensions[i];
 676       if (strcmp(extensions[i]->name, __DRI_SWRAST) == 0)
 677          psc->swrast = (__DRIswrastExtension *) extensions[i];
 678    }
 679
 680    if (psc->core == NULL || psc->swrast == NULL) {
 681       ErrorMessageF("core dri extension not found\n");
 682       goto handle_error;
 683    }
 684
 685    psc->driScreen =
 686       psc->swrast->createNewScreen(screen, loader_extensions,
 687                                    &driver_configs, psc);
 688    if (psc->driScreen == NULL) {
 689       ErrorMessageF("failed to create dri screen\n");
 690       goto handle_error;
 691    }
 692
 693    extensions = psc->core->getExtensions(psc->driScreen);
 694    driswBindExtensions(psc, extensions);
 695
 696    configs = driConvertConfigs(psc->core, psc->base.configs, driver_configs);
 697    visuals = driConvertConfigs(psc->core, psc->base.visuals, driver_configs);
 698
 699    if (!configs || !visuals)
 700        goto handle_error;
 701
 702    glx_config_destroy_list(psc->base.configs);
 703    psc->base.configs = configs;
 704    glx_config_destroy_list(psc->base.visuals);
 705    psc->base.visuals = visuals;
 706
 707    psc->driver_configs = driver_configs;
 708
 709    psc->base.vtable = &drisw_screen_vtable;
 710    psp = &psc->vtable;
 711    psc->base.driScreen = psp;
 712    psp->destroyScreen = driswDestroyScreen;
 713    psp->createDrawable = driswCreateDrawable;
 714    psp->swapBuffers = driswSwapBuffers;
 715
 716    return &psc->base;
 717
 718  handle_error:
 719    if (configs)
 720        glx_config_destroy_list(configs);
 721    if (visuals)
 722        glx_config_destroy_list(visuals);
 723    if (psc->driScreen)
 724        psc->core->destroyScreen(psc->driScreen);
 725    psc->driScreen = NULL;
 726
 727    if (psc->driver)
 728       dlclose(psc->driver);
 729    glx_screen_cleanup(&psc->base);
 730    free(psc);
 731
 732    CriticalErrorMessageF("failed to load driver: %s\n", SWRAST_DRIVER_NAME);
 733
 734    return NULL;
 735 }
 736
 737 /* Called from __glXFreeDisplayPrivate.
 738  */
 739 static void
 740 driswDestroyDisplay(__GLXDRIdisplay * dpy)
 741 {
 742    free(dpy);
 743 }
 744
 745 /*
 746  * Allocate, initialize and return a __DRIdisplayPrivate object.
 747  * This is called from __glXInitialize() when we are given a new
 748  * display pointer.
 749  */
 750 _X_HIDDEN __GLXDRIdisplay *
 751 driswCreateDisplay(Display * dpy)
 752 {
 753    struct drisw_display *pdpyp;
 754
 755    pdpyp = malloc(sizeof *pdpyp);
 756    if (pdpyp == NULL)
 757       return NULL;
 758
 759    pdpyp->base.destroyDisplay = driswDestroyDisplay;
 760    pdpyp->base.createScreen = driswCreateScreen;
 761
 762    return &pdpyp->base;
 763 }
 764
 765 #endif /* GLX_DIRECT_RENDERING */