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    if (shareList) {
 384       /* If the shareList context is not a DRISW context, we cannot possibly
 385        * create a DRISW context that shares it.
 386        */
 387       if (shareList->vtable->destroy != drisw_destroy_context) {
 388          return NULL;
 389       }
 390
 391       pcp_shared = (struct drisw_context *) shareList;
 392       shared = pcp_shared->driContext;
 393    }
 394
 395    pcp = calloc(1, sizeof *pcp);
 396    if (pcp == NULL)
 397       return NULL;
 398
 399    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 400       free(pcp);
 401       return NULL;
 402    }
 403
 404    pcp->base.renderType = renderType;
 405
 406    pcp->driContext =
 407       (*psc->core->createNewContext) (psc->driScreen,
 408                                       config->driConfig, shared, pcp);
 409    if (pcp->driContext == NULL) {
 410       free(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 renderType = GLX_RGBA_TYPE;
 435    uint32_t flags = 0;
 436    unsigned api;
 437    int reset = __DRI_CTX_RESET_NO_NOTIFICATION;
 438    uint32_t ctx_attribs[2 * 4];
 439    unsigned num_ctx_attribs = 0;
 440
 441    if (!psc->base.driScreen)
 442       return NULL;
 443
 444    if (psc->swrast->base.version < 3)
 445       return NULL;
 446
 447    /* Remap the GLX tokens to DRI2 tokens.
 448     */
 449    if (!dri2_convert_glx_attribs(num_attribs, attribs,
 450                                  &major_ver, &minor_ver, &flags, &api, &reset,
 451                                  error))
 452       return NULL;
 453
 454    if (reset != __DRI_CTX_RESET_NO_NOTIFICATION)
 455       return NULL;
 456
 457    if (shareList) {
 458       pcp_shared = (struct drisw_context *) shareList;
 459       shared = pcp_shared->driContext;
 460    }
 461
 462    pcp = calloc(1, sizeof *pcp);
 463    if (pcp == NULL)
 464       return NULL;
 465
 466    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 467       free(pcp);
 468       return NULL;
 469    }
 470
 471    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MAJOR_VERSION;
 472    ctx_attribs[num_ctx_attribs++] = major_ver;
 473    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MINOR_VERSION;
 474    ctx_attribs[num_ctx_attribs++] = minor_ver;
 475
 476    if (flags != 0) {
 477       ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_FLAGS;
 478
 479       /* The current __DRI_CTX_FLAG_* values are identical to the
 480        * GLX_CONTEXT_*_BIT values.
 481        */
 482       ctx_attribs[num_ctx_attribs++] = flags;
 483    }
 484
 485    pcp->base.renderType = renderType;
 486
 487    pcp->driContext =
 488       (*psc->swrast->createContextAttribs) (psc->driScreen,
 489                                             api,
 490                                             config->driConfig,
 491                                             shared,
 492                                             num_ctx_attribs / 2,
 493                                             ctx_attribs,
 494                                             error,
 495                                             pcp);
 496    if (pcp->driContext == NULL) {
 497       free(pcp);
 498       return NULL;
 499    }
 500
 501    pcp->base.vtable = &drisw_context_vtable;
 502
 503    return &pcp->base;
 504 }
 505
 506 static void
 507 driswDestroyDrawable(__GLXDRIdrawable * pdraw)
 508 {
 509    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 510    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 511
 512    (*psc->core->destroyDrawable) (pdp->driDrawable);
 513
 514    XDestroyDrawable(pdp, pdraw->psc->dpy, pdraw->drawable);
 515    free(pdp);
 516 }
 517
 518 static __GLXDRIdrawable *
 519 driswCreateDrawable(struct glx_screen *base, XID xDrawable,
 520                     GLXDrawable drawable, struct glx_config *modes)
 521 {
 522    struct drisw_drawable *pdp;
 523    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) modes;
 524    struct drisw_screen *psc = (struct drisw_screen *) base;
 525    Bool ret;
 526    const __DRIswrastExtension *swrast = psc->swrast;
 527
 528    pdp = calloc(1, sizeof(*pdp));
 529    if (!pdp)
 530       return NULL;
 531
 532    pdp->base.xDrawable = xDrawable;
 533    pdp->base.drawable = drawable;
 534    pdp->base.psc = &psc->base;
 535
 536    ret = XCreateDrawable(pdp, psc->base.dpy, xDrawable, modes->visualID);
 537    if (!ret) {
 538       free(pdp);
 539       return NULL;
 540    }
 541
 542    /* Create a new drawable */
 543    pdp->driDrawable =
 544       (*swrast->createNewDrawable) (psc->driScreen, config->driConfig, pdp);
 545
 546    if (!pdp->driDrawable) {
 547       XDestroyDrawable(pdp, psc->base.dpy, xDrawable);
 548       free(pdp);
 549       return NULL;
 550    }
 551
 552    pdp->base.destroyDrawable = driswDestroyDrawable;
 553
 554    return &pdp->base;
 555 }
 556
 557 static int64_t
 558 driswSwapBuffers(__GLXDRIdrawable * pdraw,
 559                  int64_t target_msc, int64_t divisor, int64_t remainder,
 560                  Bool flush)
 561 {
 562    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 563    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 564
 565    (void) target_msc;
 566    (void) divisor;
 567    (void) remainder;
 568
 569    if (flush) {
 570       glFlush();
 571    }
 572
 573    (*psc->core->swapBuffers) (pdp->driDrawable);
 574
 575    return 0;
 576 }
 577
 578 static void
 579 driswDestroyScreen(struct glx_screen *base)
 580 {
 581    struct drisw_screen *psc = (struct drisw_screen *) base;
 582
 583    /* Free the direct rendering per screen data */
 584    (*psc->core->destroyScreen) (psc->driScreen);
 585    driDestroyConfigs(psc->driver_configs);
 586    psc->driScreen = NULL;
 587    if (psc->driver)
 588       dlclose(psc->driver);
 589 }
 590
 591 #define SWRAST_DRIVER_NAME "swrast"
 592
 593 static void *
 594 driOpenSwrast(void)
 595 {
 596    void *driver = NULL;
 597
 598    if (driver == NULL)
 599       driver = driOpenDriver(SWRAST_DRIVER_NAME);
 600
 601    return driver;
 602 }
 603
 604 static const struct glx_screen_vtable drisw_screen_vtable = {
 605    drisw_create_context,
 606    drisw_create_context_attribs
 607 };
 608
 609 static void
 610 driswBindExtensions(struct drisw_screen *psc, const __DRIextension **extensions)
 611 {
 612    int i;
 613
 614    __glXEnableDirectExtension(&psc->base, "GLX_SGI_make_current_read");
 615
 616    if (psc->swrast->base.version >= 3) {
 617       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
 618       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context_profile");
 619
 620       /* DRISW version >= 2 implies support for OpenGL ES 2.0.
 621        */
 622       __glXEnableDirectExtension(&psc->base,
 623                                  "GLX_EXT_create_context_es2_profile");
 624    }
 625
 626    /* FIXME: Figure out what other extensions can be ported here from dri2. */
 627    for (i = 0; extensions[i]; i++) {
 628       if ((strcmp(extensions[i]->name, __DRI_TEX_BUFFER) == 0)) {
 629          psc->texBuffer = (__DRItexBufferExtension *) extensions[i];
 630          __glXEnableDirectExtension(&psc->base, "GLX_EXT_texture_from_pixmap");
 631       }
 632    }
 633 }
 634
 635 static struct glx_screen *
 636 driswCreateScreen(int screen, struct glx_display *priv)
 637 {
 638    __GLXDRIscreen *psp;
 639    const __DRIconfig **driver_configs;
 640    const __DRIextension **extensions;
 641    struct drisw_screen *psc;
 642    struct glx_config *configs = NULL, *visuals = NULL;
 643    int i;
 644
 645    psc = calloc(1, sizeof *psc);
 646    if (psc == NULL)
 647       return NULL;
 648
 649    if (!glx_screen_init(&psc->base, screen, priv)) {
 650       free(psc);
 651       return NULL;
 652    }
 653
 654    psc->driver = driOpenSwrast();
 655    if (psc->driver == NULL)
 656       goto handle_error;
 657
 658    extensions = dlsym(psc->driver, __DRI_DRIVER_EXTENSIONS);
 659    if (extensions == NULL) {
 660       ErrorMessageF("driver exports no extensions (%s)\n", dlerror());
 661       goto handle_error;
 662    }
 663
 664    for (i = 0; extensions[i]; i++) {
 665       if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
 666          psc->core = (__DRIcoreExtension *) extensions[i];
 667       if (strcmp(extensions[i]->name, __DRI_SWRAST) == 0)
 668          psc->swrast = (__DRIswrastExtension *) extensions[i];
 669    }
 670
 671    if (psc->core == NULL || psc->swrast == NULL) {
 672       ErrorMessageF("core dri extension not found\n");
 673       goto handle_error;
 674    }
 675
 676    psc->driScreen =
 677       psc->swrast->createNewScreen(screen, loader_extensions,
 678                                    &driver_configs, psc);
 679    if (psc->driScreen == NULL) {
 680       ErrorMessageF("failed to create dri screen\n");
 681       goto handle_error;
 682    }
 683
 684    extensions = psc->core->getExtensions(psc->driScreen);
 685    driswBindExtensions(psc, extensions);
 686
 687    configs = driConvertConfigs(psc->core, psc->base.configs, driver_configs);
 688    visuals = driConvertConfigs(psc->core, psc->base.visuals, driver_configs);
 689
 690    if (!configs || !visuals)
 691        goto handle_error;
 692
 693    glx_config_destroy_list(psc->base.configs);
 694    psc->base.configs = configs;
 695    glx_config_destroy_list(psc->base.visuals);
 696    psc->base.visuals = visuals;
 697
 698    psc->driver_configs = driver_configs;
 699
 700    psc->base.vtable = &drisw_screen_vtable;
 701    psp = &psc->vtable;
 702    psc->base.driScreen = psp;
 703    psp->destroyScreen = driswDestroyScreen;
 704    psp->createDrawable = driswCreateDrawable;
 705    psp->swapBuffers = driswSwapBuffers;
 706
 707    return &psc->base;
 708
 709  handle_error:
 710    if (configs)
 711        glx_config_destroy_list(configs);
 712    if (visuals)
 713        glx_config_destroy_list(visuals);
 714    if (psc->driScreen)
 715        psc->core->destroyScreen(psc->driScreen);
 716    psc->driScreen = NULL;
 717
 718    if (psc->driver)
 719       dlclose(psc->driver);
 720    glx_screen_cleanup(&psc->base);
 721    free(psc);
 722
 723    CriticalErrorMessageF("failed to load driver: %s\n", SWRAST_DRIVER_NAME);
 724
 725    return NULL;
 726 }
 727
 728 /* Called from __glXFreeDisplayPrivate.
 729  */
 730 static void
 731 driswDestroyDisplay(__GLXDRIdisplay * dpy)
 732 {
 733    free(dpy);
 734 }
 735
 736 /*
 737  * Allocate, initialize and return a __DRIdisplayPrivate object.
 738  * This is called from __glXInitialize() when we are given a new
 739  * display pointer.
 740  */
 741 _X_HIDDEN __GLXDRIdisplay *
 742 driswCreateDisplay(Display * dpy)
 743 {
 744    struct drisw_display *pdpyp;
 745
 746    pdpyp = malloc(sizeof *pdpyp);
 747    if (pdpyp == NULL)
 748       return NULL;
 749
 750    pdpyp->base.destroyDisplay = driswDestroyDisplay;
 751    pdpyp->base.createScreen = driswCreateScreen;
 752
 753    return &pdpyp->base;
 754 }
 755
 756 #endif /* GLX_DIRECT_RENDERING */