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    const __DRIcopySubBufferExtension *copySubBuffer;
  53
  54    const __DRIconfig **driver_configs;
  55
  56    void *driver;
  57 };
  58
  59 struct drisw_drawable
  60 {
  61    __GLXDRIdrawable base;
  62
  63    GC gc;
  64    GC swapgc;
  65
  66    __DRIdrawable *driDrawable;
  67    XVisualInfo *visinfo;
  68    XImage *ximage;
  69 };
  70
  71 static Bool
  72 XCreateDrawable(struct drisw_drawable * pdp,
  73                 Display * dpy, XID drawable, int visualid)
  74 {
  75    XGCValues gcvalues;
  76    long visMask;
  77    XVisualInfo visTemp;
  78    int num_visuals;
  79
  80    /* create GC's */
  81    pdp->gc = XCreateGC(dpy, drawable, 0, NULL);
  82    pdp->swapgc = XCreateGC(dpy, drawable, 0, NULL);
  83
  84    gcvalues.function = GXcopy;
  85    gcvalues.graphics_exposures = False;
  86    XChangeGC(dpy, pdp->gc, GCFunction, &gcvalues);
  87    XChangeGC(dpy, pdp->swapgc, GCFunction, &gcvalues);
  88    XChangeGC(dpy, pdp->swapgc, GCGraphicsExposures, &gcvalues);
  89
  90    /* visual */
  91    visTemp.visualid = visualid;
  92    visMask = VisualIDMask;
  93    pdp->visinfo = XGetVisualInfo(dpy, visMask, &visTemp, &num_visuals);
  94
  95    if (!pdp->visinfo || num_visuals == 0)
  96       return False;
  97
  98    /* create XImage */
  99    pdp->ximage = XCreateImage(dpy,
 100                               pdp->visinfo->visual,
 101                               pdp->visinfo->depth,
 102                               ZPixmap, 0,             /* format, offset */
 103                               NULL,                   /* data */
 104                               0, 0,                   /* width, height */
 105                               32,                     /* bitmap_pad */
 106                               0);                     /* bytes_per_line */
 107
 108   /**
 109    * swrast does not handle 24-bit depth with 24 bpp, so let X do the
 110    * the conversion for us.
 111    */
 112   if (pdp->ximage->bits_per_pixel == 24)
 113      pdp->ximage->bits_per_pixel = 32;
 114
 115    return True;
 116 }
 117
 118 static void
 119 XDestroyDrawable(struct drisw_drawable * pdp, Display * dpy, XID drawable)
 120 {
 121    XDestroyImage(pdp->ximage);
 122    free(pdp->visinfo);
 123
 124    XFreeGC(dpy, pdp->gc);
 125    XFreeGC(dpy, pdp->swapgc);
 126 }
 127
 128 /**
 129  * swrast loader functions
 130  */
 131
 132 static void
 133 swrastGetDrawableInfo(__DRIdrawable * draw,
 134                       int *x, int *y, int *w, int *h,
 135                       void *loaderPrivate)
 136 {
 137    struct drisw_drawable *pdp = loaderPrivate;
 138    __GLXDRIdrawable *pdraw = &(pdp->base);
 139    Display *dpy = pdraw->psc->dpy;
 140    Drawable drawable;
 141
 142    Window root;
 143    unsigned uw, uh, bw, depth;
 144
 145    drawable = pdraw->xDrawable;
 146
 147    XGetGeometry(dpy, drawable, &root, x, y, &uw, &uh, &bw, &depth);
 148    *w = uw;
 149    *h = uh;
 150 }
 151
 152 /**
 153  * Align renderbuffer pitch.
 154  *
 155  * This should be chosen by the driver and the loader (libGL, xserver/glx)
 156  * should use the driver provided pitch.
 157  *
 158  * It seems that the xorg loader (that is the xserver loading swrast_dri for
 159  * indirect rendering, not client-side libGL) requires that the pitch is
 160  * exactly the image width padded to 32 bits. XXX
 161  *
 162  * The above restriction can probably be overcome by using ScratchPixmap and
 163  * CopyArea in the xserver, similar to ShmPutImage, and setting the width of
 164  * the scratch pixmap to 'pitch / cpp'.
 165  */
 166 static inline int
 167 bytes_per_line(unsigned pitch_bits, unsigned mul)
 168 {
 169    unsigned mask = mul - 1;
 170
 171    return ((pitch_bits + mask) & ~mask) / 8;
 172 }
 173
 174 static void
 175 swrastPutImage2(__DRIdrawable * draw, int op,
 176                 int x, int y, int w, int h, int stride,
 177                 char *data, void *loaderPrivate)
 178 {
 179    struct drisw_drawable *pdp = loaderPrivate;
 180    __GLXDRIdrawable *pdraw = &(pdp->base);
 181    Display *dpy = pdraw->psc->dpy;
 182    Drawable drawable;
 183    XImage *ximage;
 184    GC gc;
 185
 186    switch (op) {
 187    case __DRI_SWRAST_IMAGE_OP_DRAW:
 188       gc = pdp->gc;
 189       break;
 190    case __DRI_SWRAST_IMAGE_OP_SWAP:
 191       gc = pdp->swapgc;
 192       break;
 193    default:
 194       return;
 195    }
 196
 197    drawable = pdraw->xDrawable;
 198
 199    ximage = pdp->ximage;
 200    ximage->data = data;
 201    ximage->width = w;
 202    ximage->height = h;
 203    ximage->bytes_per_line = stride ? stride : bytes_per_line(w * ximage->bits_per_pixel, 32);
 204
 205    XPutImage(dpy, drawable, gc, ximage, 0, 0, x, y, w, h);
 206
 207    ximage->data = NULL;
 208 }
 209
 210 static void
 211 swrastPutImage(__DRIdrawable * draw, int op,
 212                int x, int y, int w, int h,
 213                char *data, void *loaderPrivate)
 214 {
 215    swrastPutImage2(draw, op, x, y, w, h, 0, data, loaderPrivate);
 216 }
 217
 218 static void
 219 swrastGetImage(__DRIdrawable * read,
 220                int x, int y, int w, int h,
 221                char *data, void *loaderPrivate)
 222 {
 223    struct drisw_drawable *prp = loaderPrivate;
 224    __GLXDRIdrawable *pread = &(prp->base);
 225    Display *dpy = pread->psc->dpy;
 226    Drawable readable;
 227    XImage *ximage;
 228
 229    readable = pread->xDrawable;
 230
 231    ximage = prp->ximage;
 232    ximage->data = data;
 233    ximage->width = w;
 234    ximage->height = h;
 235    ximage->bytes_per_line = bytes_per_line(w * ximage->bits_per_pixel, 32);
 236
 237    XGetSubImage(dpy, readable, x, y, w, h, ~0L, ZPixmap, ximage, 0, 0);
 238
 239    ximage->data = NULL;
 240 }
 241
 242 static const __DRIswrastLoaderExtension swrastLoaderExtension = {
 243    {__DRI_SWRAST_LOADER, __DRI_SWRAST_LOADER_VERSION},
 244    swrastGetDrawableInfo,
 245    swrastPutImage,
 246    swrastGetImage,
 247    swrastPutImage2,
 248 };
 249
 250 static const __DRIextension *loader_extensions[] = {
 251    &systemTimeExtension.base,
 252    &swrastLoaderExtension.base,
 253    NULL
 254 };
 255
 256 /**
 257  * GLXDRI functions
 258  */
 259
 260 static void
 261 drisw_destroy_context(struct glx_context *context)
 262 {
 263    struct drisw_context *pcp = (struct drisw_context *) context;
 264    struct drisw_screen *psc = (struct drisw_screen *) context->psc;
 265
 266    driReleaseDrawables(&pcp->base);
 267
 268    free((char *) context->extensions);
 269
 270    (*psc->core->destroyContext) (pcp->driContext);
 271
 272    free(pcp);
 273 }
 274
 275 static int
 276 drisw_bind_context(struct glx_context *context, struct glx_context *old,
 277                    GLXDrawable draw, GLXDrawable read)
 278 {
 279    struct drisw_context *pcp = (struct drisw_context *) context;
 280    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 281    struct drisw_drawable *pdraw, *pread;
 282
 283    pdraw = (struct drisw_drawable *) driFetchDrawable(context, draw);
 284    pread = (struct drisw_drawable *) driFetchDrawable(context, read);
 285
 286    driReleaseDrawables(&pcp->base);
 287
 288    if (pdraw == NULL || pread == NULL)
 289       return GLXBadDrawable;
 290
 291    if ((*psc->core->bindContext) (pcp->driContext,
 292                                   pdraw->driDrawable, pread->driDrawable))
 293       return Success;
 294
 295    return GLXBadContext;
 296 }
 297
 298 static void
 299 drisw_unbind_context(struct glx_context *context, struct glx_context *new)
 300 {
 301    struct drisw_context *pcp = (struct drisw_context *) context;
 302    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 303
 304    (*psc->core->unbindContext) (pcp->driContext);
 305 }
 306
 307 static void
 308 drisw_bind_tex_image(Display * dpy,
 309                     GLXDrawable drawable,
 310                     int buffer, const int *attrib_list)
 311 {
 312    struct glx_context *gc = __glXGetCurrentContext();
 313    struct drisw_context *pcp = (struct drisw_context *) gc;
 314    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 315    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 316    struct drisw_screen *psc;
 317
 318    __glXInitialize(dpy);
 319
 320    if (pdraw != NULL) {
 321       psc = (struct drisw_screen *) base->psc;
 322
 323       if (!psc->texBuffer)
 324          return;
 325
 326       if (psc->texBuffer->base.version >= 2 &&
 327         psc->texBuffer->setTexBuffer2 != NULL) {
 328               (*psc->texBuffer->setTexBuffer2) (pcp->driContext,
 329                                            pdraw->base.textureTarget,
 330                                            pdraw->base.textureFormat,
 331                                            pdraw->driDrawable);
 332       }
 333       else {
 334               (*psc->texBuffer->setTexBuffer) (pcp->driContext,
 335                                           pdraw->base.textureTarget,
 336                                           pdraw->driDrawable);
 337       }
 338    }
 339 }
 340
 341 static void
 342 drisw_release_tex_image(Display * dpy, GLXDrawable drawable, int buffer)
 343 {
 344 #if __DRI_TEX_BUFFER_VERSION >= 3
 345    struct glx_context *gc = __glXGetCurrentContext();
 346    struct dri2_context *pcp = (struct dri2_context *) gc;
 347    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 348    struct glx_display *dpyPriv = __glXInitialize(dpy);
 349    struct dri2_drawable *pdraw = (struct dri2_drawable *) base;
 350    struct dri2_screen *psc;
 351
 352    if (pdraw != NULL) {
 353       psc = (struct dri2_screen *) base->psc;
 354
 355       if (!psc->texBuffer)
 356          return;
 357
 358       if (psc->texBuffer->base.version >= 3 &&
 359           psc->texBuffer->releaseTexBuffer != NULL) {
 360          (*psc->texBuffer->releaseTexBuffer) (pcp->driContext,
 361                                            pdraw->base.textureTarget,
 362                                            pdraw->driDrawable);
 363       }
 364    }
 365 #endif
 366 }
 367
 368 static const struct glx_context_vtable drisw_context_vtable = {
 369    drisw_destroy_context,
 370    drisw_bind_context,
 371    drisw_unbind_context,
 372    NULL,
 373    NULL,
 374    DRI_glXUseXFont,
 375    drisw_bind_tex_image,
 376    drisw_release_tex_image,
 377    NULL, /* get_proc_address */
 378 };
 379
 380 static struct glx_context *
 381 drisw_create_context(struct glx_screen *base,
 382                      struct glx_config *config_base,
 383                      struct glx_context *shareList, int renderType)
 384 {
 385    struct drisw_context *pcp, *pcp_shared;
 386    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 387    struct drisw_screen *psc = (struct drisw_screen *) base;
 388    __DRIcontext *shared = NULL;
 389
 390    if (!psc->base.driScreen)
 391       return NULL;
 392
 393    /* Check the renderType value */
 394    if (!validate_renderType_against_config(config_base, renderType))
 395        return NULL;
 396
 397    if (shareList) {
 398       /* If the shareList context is not a DRISW context, we cannot possibly
 399        * create a DRISW context that shares it.
 400        */
 401       if (shareList->vtable->destroy != drisw_destroy_context) {
 402          return NULL;
 403       }
 404
 405       pcp_shared = (struct drisw_context *) shareList;
 406       shared = pcp_shared->driContext;
 407    }
 408
 409    pcp = calloc(1, sizeof *pcp);
 410    if (pcp == NULL)
 411       return NULL;
 412
 413    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 414       free(pcp);
 415       return NULL;
 416    }
 417
 418    pcp->base.renderType = renderType;
 419
 420    pcp->driContext =
 421       (*psc->core->createNewContext) (psc->driScreen,
 422                                       config->driConfig, shared, pcp);
 423    if (pcp->driContext == NULL) {
 424       free(pcp);
 425       return NULL;
 426    }
 427
 428    pcp->base.vtable = &drisw_context_vtable;
 429
 430    return &pcp->base;
 431 }
 432
 433 static struct glx_context *
 434 drisw_create_context_attribs(struct glx_screen *base,
 435                              struct glx_config *config_base,
 436                              struct glx_context *shareList,
 437                              unsigned num_attribs,
 438                              const uint32_t *attribs,
 439                              unsigned *error)
 440 {
 441    struct drisw_context *pcp, *pcp_shared;
 442    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 443    struct drisw_screen *psc = (struct drisw_screen *) base;
 444    __DRIcontext *shared = NULL;
 445
 446    uint32_t minor_ver;
 447    uint32_t major_ver;
 448    uint32_t renderType;
 449    uint32_t flags;
 450    unsigned api;
 451    int reset;
 452    uint32_t ctx_attribs[2 * 4];
 453    unsigned num_ctx_attribs = 0;
 454
 455    if (!psc->base.driScreen)
 456       return NULL;
 457
 458    if (psc->swrast->base.version < 3)
 459       return NULL;
 460
 461    /* Remap the GLX tokens to DRI2 tokens.
 462     */
 463    if (!dri2_convert_glx_attribs(num_attribs, attribs,
 464                                  &major_ver, &minor_ver, &renderType, &flags,
 465                                  &api, &reset, error))
 466       return NULL;
 467
 468    /* Check the renderType value */
 469    if (!validate_renderType_against_config(config_base, renderType)) {
 470        return NULL;
 471    }
 472
 473    if (reset != __DRI_CTX_RESET_NO_NOTIFICATION)
 474       return NULL;
 475
 476    if (shareList) {
 477       pcp_shared = (struct drisw_context *) shareList;
 478       shared = pcp_shared->driContext;
 479    }
 480
 481    pcp = calloc(1, sizeof *pcp);
 482    if (pcp == NULL)
 483       return NULL;
 484
 485    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 486       free(pcp);
 487       return NULL;
 488    }
 489
 490    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MAJOR_VERSION;
 491    ctx_attribs[num_ctx_attribs++] = major_ver;
 492    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MINOR_VERSION;
 493    ctx_attribs[num_ctx_attribs++] = minor_ver;
 494
 495    if (flags != 0) {
 496       ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_FLAGS;
 497
 498       /* The current __DRI_CTX_FLAG_* values are identical to the
 499        * GLX_CONTEXT_*_BIT values.
 500        */
 501       ctx_attribs[num_ctx_attribs++] = flags;
 502    }
 503
 504    pcp->base.renderType = renderType;
 505
 506    pcp->driContext =
 507       (*psc->swrast->createContextAttribs) (psc->driScreen,
 508                                             api,
 509                                             config->driConfig,
 510                                             shared,
 511                                             num_ctx_attribs / 2,
 512                                             ctx_attribs,
 513                                             error,
 514                                             pcp);
 515    if (pcp->driContext == NULL) {
 516       free(pcp);
 517       return NULL;
 518    }
 519
 520    pcp->base.vtable = &drisw_context_vtable;
 521
 522    return &pcp->base;
 523 }
 524
 525 static void
 526 driswDestroyDrawable(__GLXDRIdrawable * pdraw)
 527 {
 528    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 529    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 530
 531    (*psc->core->destroyDrawable) (pdp->driDrawable);
 532
 533    XDestroyDrawable(pdp, pdraw->psc->dpy, pdraw->drawable);
 534    free(pdp);
 535 }
 536
 537 static __GLXDRIdrawable *
 538 driswCreateDrawable(struct glx_screen *base, XID xDrawable,
 539                     GLXDrawable drawable, struct glx_config *modes)
 540 {
 541    struct drisw_drawable *pdp;
 542    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) modes;
 543    struct drisw_screen *psc = (struct drisw_screen *) base;
 544    Bool ret;
 545    const __DRIswrastExtension *swrast = psc->swrast;
 546
 547    pdp = calloc(1, sizeof(*pdp));
 548    if (!pdp)
 549       return NULL;
 550
 551    pdp->base.xDrawable = xDrawable;
 552    pdp->base.drawable = drawable;
 553    pdp->base.psc = &psc->base;
 554
 555    ret = XCreateDrawable(pdp, psc->base.dpy, xDrawable, modes->visualID);
 556    if (!ret) {
 557       free(pdp);
 558       return NULL;
 559    }
 560
 561    /* Create a new drawable */
 562    pdp->driDrawable =
 563       (*swrast->createNewDrawable) (psc->driScreen, config->driConfig, pdp);
 564
 565    if (!pdp->driDrawable) {
 566       XDestroyDrawable(pdp, psc->base.dpy, xDrawable);
 567       free(pdp);
 568       return NULL;
 569    }
 570
 571    pdp->base.destroyDrawable = driswDestroyDrawable;
 572
 573    return &pdp->base;
 574 }
 575
 576 static int64_t
 577 driswSwapBuffers(__GLXDRIdrawable * pdraw,
 578                  int64_t target_msc, int64_t divisor, int64_t remainder,
 579                  Bool flush)
 580 {
 581    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 582    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 583
 584    (void) target_msc;
 585    (void) divisor;
 586    (void) remainder;
 587
 588    if (flush) {
 589       glFlush();
 590    }
 591
 592    (*psc->core->swapBuffers) (pdp->driDrawable);
 593
 594    return 0;
 595 }
 596
 597 static void
 598 driswCopySubBuffer(__GLXDRIdrawable * pdraw,
 599                    int x, int y, int width, int height, Bool flush)
 600 {
 601    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 602    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 603
 604    if (flush) {
 605       glFlush();
 606    }
 607
 608    (*psc->copySubBuffer->copySubBuffer) (pdp->driDrawable,
 609                                             x, y, width, height);
 610 }
 611
 612 static void
 613 driswDestroyScreen(struct glx_screen *base)
 614 {
 615    struct drisw_screen *psc = (struct drisw_screen *) base;
 616
 617    /* Free the direct rendering per screen data */
 618    (*psc->core->destroyScreen) (psc->driScreen);
 619    driDestroyConfigs(psc->driver_configs);
 620    psc->driScreen = NULL;
 621    if (psc->driver)
 622       dlclose(psc->driver);
 623 }
 624
 625 #define SWRAST_DRIVER_NAME "swrast"
 626
 627 static void *
 628 driOpenSwrast(void)
 629 {
 630    void *driver = NULL;
 631
 632    if (driver == NULL)
 633       driver = driOpenDriver(SWRAST_DRIVER_NAME);
 634
 635    return driver;
 636 }
 637
 638 static const struct glx_screen_vtable drisw_screen_vtable = {
 639    drisw_create_context,
 640    drisw_create_context_attribs
 641 };
 642
 643 static void
 644 driswBindExtensions(struct drisw_screen *psc, const __DRIextension **extensions)
 645 {
 646    int i;
 647
 648    __glXEnableDirectExtension(&psc->base, "GLX_SGI_make_current_read");
 649
 650    if (psc->swrast->base.version >= 3) {
 651       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
 652       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context_profile");
 653
 654       /* DRISW version >= 2 implies support for OpenGL ES 2.0.
 655        */
 656       __glXEnableDirectExtension(&psc->base,
 657                                  "GLX_EXT_create_context_es2_profile");
 658    }
 659
 660    if (psc->copySubBuffer)
 661       __glXEnableDirectExtension(&psc->base, "GLX_MESA_copy_sub_buffer");
 662
 663    /* FIXME: Figure out what other extensions can be ported here from dri2. */
 664    for (i = 0; extensions[i]; i++) {
 665       if ((strcmp(extensions[i]->name, __DRI_TEX_BUFFER) == 0)) {
 666          psc->texBuffer = (__DRItexBufferExtension *) extensions[i];
 667          __glXEnableDirectExtension(&psc->base, "GLX_EXT_texture_from_pixmap");
 668       }
 669    }
 670 }
 671
 672 static struct glx_screen *
 673 driswCreateScreen(int screen, struct glx_display *priv)
 674 {
 675    __GLXDRIscreen *psp;
 676    const __DRIconfig **driver_configs;
 677    const __DRIextension **extensions;
 678    struct drisw_screen *psc;
 679    struct glx_config *configs = NULL, *visuals = NULL;
 680    int i;
 681
 682    psc = calloc(1, sizeof *psc);
 683    if (psc == NULL)
 684       return NULL;
 685
 686    if (!glx_screen_init(&psc->base, screen, priv)) {
 687       free(psc);
 688       return NULL;
 689    }
 690
 691    psc->driver = driOpenSwrast();
 692    if (psc->driver == NULL)
 693       goto handle_error;
 694
 695    extensions = driGetDriverExtensions(psc->driver, SWRAST_DRIVER_NAME);
 696    if (extensions == NULL)
 697       goto handle_error;
 698
 699    for (i = 0; extensions[i]; i++) {
 700       if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
 701          psc->core = (__DRIcoreExtension *) extensions[i];
 702       if (strcmp(extensions[i]->name, __DRI_SWRAST) == 0)
 703          psc->swrast = (__DRIswrastExtension *) extensions[i];
 704       if (strcmp(extensions[i]->name, __DRI_COPY_SUB_BUFFER) == 0)
 705          psc->copySubBuffer = (__DRIcopySubBufferExtension *) extensions[i];
 706    }
 707
 708    if (psc->core == NULL || psc->swrast == NULL) {
 709       ErrorMessageF("core dri extension not found\n");
 710       goto handle_error;
 711    }
 712
 713    if (psc->swrast->base.version >= 4) {
 714       psc->driScreen =
 715          psc->swrast->createNewScreen2(screen, loader_extensions,
 716                                        extensions,
 717                                        &driver_configs, psc);
 718    } else {
 719       psc->driScreen =
 720          psc->swrast->createNewScreen(screen, loader_extensions,
 721                                       &driver_configs, psc);
 722    }
 723    if (psc->driScreen == NULL) {
 724       ErrorMessageF("failed to create dri screen\n");
 725       goto handle_error;
 726    }
 727
 728    extensions = psc->core->getExtensions(psc->driScreen);
 729    driswBindExtensions(psc, extensions);
 730
 731    configs = driConvertConfigs(psc->core, psc->base.configs, driver_configs);
 732    visuals = driConvertConfigs(psc->core, psc->base.visuals, driver_configs);
 733
 734    if (!configs || !visuals)
 735        goto handle_error;
 736
 737    glx_config_destroy_list(psc->base.configs);
 738    psc->base.configs = configs;
 739    glx_config_destroy_list(psc->base.visuals);
 740    psc->base.visuals = visuals;
 741
 742    psc->driver_configs = driver_configs;
 743
 744    psc->base.vtable = &drisw_screen_vtable;
 745    psp = &psc->vtable;
 746    psc->base.driScreen = psp;
 747    psp->destroyScreen = driswDestroyScreen;
 748    psp->createDrawable = driswCreateDrawable;
 749    psp->swapBuffers = driswSwapBuffers;
 750
 751    if (psc->copySubBuffer)
 752       psp->copySubBuffer = driswCopySubBuffer;
 753
 754    return &psc->base;
 755
 756  handle_error:
 757    if (configs)
 758        glx_config_destroy_list(configs);
 759    if (visuals)
 760        glx_config_destroy_list(visuals);
 761    if (psc->driScreen)
 762        psc->core->destroyScreen(psc->driScreen);
 763    psc->driScreen = NULL;
 764
 765    if (psc->driver)
 766       dlclose(psc->driver);
 767    glx_screen_cleanup(&psc->base);
 768    free(psc);
 769
 770    CriticalErrorMessageF("failed to load driver: %s\n", SWRAST_DRIVER_NAME);
 771
 772    return NULL;
 773 }
 774
 775 /* Called from __glXFreeDisplayPrivate.
 776  */
 777 static void
 778 driswDestroyDisplay(__GLXDRIdisplay * dpy)
 779 {
 780    free(dpy);
 781 }
 782
 783 /*
 784  * Allocate, initialize and return a __DRIdisplayPrivate object.
 785  * This is called from __glXInitialize() when we are given a new
 786  * display pointer.
 787  */
 788 _X_HIDDEN __GLXDRIdisplay *
 789 driswCreateDisplay(Display * dpy)
 790 {
 791    struct drisw_display *pdpyp;
 792
 793    pdpyp = malloc(sizeof *pdpyp);
 794    if (pdpyp == NULL)
 795       return NULL;
 796
 797    pdpyp->base.destroyDisplay = driswDestroyDisplay;
 798    pdpyp->base.createScreen = driswCreateScreen;
 799
 800    return &pdpyp->base;
 801 }
 802
 803 #endif /* GLX_DIRECT_RENDERING */