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 #include "drisw_priv.h"
  31
  32 static Bool
  33 XCreateDrawable(struct drisw_drawable * pdp,
  34                 Display * dpy, XID drawable, int visualid)
  35 {
  36    XGCValues gcvalues;
  37    long visMask;
  38    XVisualInfo visTemp;
  39    int num_visuals;
  40
  41    /* create GC's */
  42    pdp->gc = XCreateGC(dpy, drawable, 0, NULL);
  43    pdp->swapgc = XCreateGC(dpy, drawable, 0, NULL);
  44
  45    gcvalues.function = GXcopy;
  46    gcvalues.graphics_exposures = False;
  47    XChangeGC(dpy, pdp->gc, GCFunction, &gcvalues);
  48    XChangeGC(dpy, pdp->swapgc, GCFunction, &gcvalues);
  49    XChangeGC(dpy, pdp->swapgc, GCGraphicsExposures, &gcvalues);
  50
  51    /* visual */
  52    visTemp.visualid = visualid;
  53    visMask = VisualIDMask;
  54    pdp->visinfo = XGetVisualInfo(dpy, visMask, &visTemp, &num_visuals);
  55
  56    if (!pdp->visinfo || num_visuals == 0)
  57       return False;
  58
  59    /* create XImage */
  60    pdp->ximage = XCreateImage(dpy,
  61                               pdp->visinfo->visual,
  62                               pdp->visinfo->depth,
  63                               ZPixmap, 0,             /* format, offset */
  64                               NULL,                   /* data */
  65                               0, 0,                   /* width, height */
  66                               32,                     /* bitmap_pad */
  67                               0);                     /* bytes_per_line */
  68
  69   /**
  70    * swrast does not handle 24-bit depth with 24 bpp, so let X do the
  71    * the conversion for us.
  72    */
  73   if (pdp->ximage->bits_per_pixel == 24)
  74      pdp->ximage->bits_per_pixel = 32;
  75
  76    return True;
  77 }
  78
  79 static void
  80 XDestroyDrawable(struct drisw_drawable * pdp, Display * dpy, XID drawable)
  81 {
  82    XDestroyImage(pdp->ximage);
  83    free(pdp->visinfo);
  84
  85    XFreeGC(dpy, pdp->gc);
  86    XFreeGC(dpy, pdp->swapgc);
  87 }
  88
  89 /**
  90  * swrast loader functions
  91  */
  92
  93 static void
  94 swrastGetDrawableInfo(__DRIdrawable * draw,
  95                       int *x, int *y, int *w, int *h,
  96                       void *loaderPrivate)
  97 {
  98    struct drisw_drawable *pdp = loaderPrivate;
  99    __GLXDRIdrawable *pdraw = &(pdp->base);
 100    Display *dpy = pdraw->psc->dpy;
 101    Drawable drawable;
 102
 103    Window root;
 104    unsigned uw, uh, bw, depth;
 105
 106    drawable = pdraw->xDrawable;
 107
 108    XGetGeometry(dpy, drawable, &root, x, y, &uw, &uh, &bw, &depth);
 109    *w = uw;
 110    *h = uh;
 111 }
 112
 113 /**
 114  * Align renderbuffer pitch.
 115  *
 116  * This should be chosen by the driver and the loader (libGL, xserver/glx)
 117  * should use the driver provided pitch.
 118  *
 119  * It seems that the xorg loader (that is the xserver loading swrast_dri for
 120  * indirect rendering, not client-side libGL) requires that the pitch is
 121  * exactly the image width padded to 32 bits. XXX
 122  *
 123  * The above restriction can probably be overcome by using ScratchPixmap and
 124  * CopyArea in the xserver, similar to ShmPutImage, and setting the width of
 125  * the scratch pixmap to 'pitch / cpp'.
 126  */
 127 static inline int
 128 bytes_per_line(unsigned pitch_bits, unsigned mul)
 129 {
 130    unsigned mask = mul - 1;
 131
 132    return ((pitch_bits + mask) & ~mask) / 8;
 133 }
 134
 135 static void
 136 swrastPutImage2(__DRIdrawable * draw, int op,
 137                 int x, int y, int w, int h, int stride,
 138                 char *data, void *loaderPrivate)
 139 {
 140    struct drisw_drawable *pdp = loaderPrivate;
 141    __GLXDRIdrawable *pdraw = &(pdp->base);
 142    Display *dpy = pdraw->psc->dpy;
 143    Drawable drawable;
 144    XImage *ximage;
 145    GC gc;
 146
 147    switch (op) {
 148    case __DRI_SWRAST_IMAGE_OP_DRAW:
 149       gc = pdp->gc;
 150       break;
 151    case __DRI_SWRAST_IMAGE_OP_SWAP:
 152       gc = pdp->swapgc;
 153       break;
 154    default:
 155       return;
 156    }
 157
 158    drawable = pdraw->xDrawable;
 159
 160    ximage = pdp->ximage;
 161    ximage->data = data;
 162    ximage->width = w;
 163    ximage->height = h;
 164    ximage->bytes_per_line = stride ? stride : bytes_per_line(w * ximage->bits_per_pixel, 32);
 165
 166    XPutImage(dpy, drawable, gc, ximage, 0, 0, x, y, w, h);
 167
 168    ximage->data = NULL;
 169 }
 170
 171 static void
 172 swrastPutImage(__DRIdrawable * draw, int op,
 173                int x, int y, int w, int h,
 174                char *data, void *loaderPrivate)
 175 {
 176    swrastPutImage2(draw, op, x, y, w, h, 0, data, loaderPrivate);
 177 }
 178
 179 static void
 180 swrastGetImage2(__DRIdrawable * read,
 181                 int x, int y, int w, int h, int stride,
 182                 char *data, void *loaderPrivate)
 183 {
 184    struct drisw_drawable *prp = loaderPrivate;
 185    __GLXDRIdrawable *pread = &(prp->base);
 186    Display *dpy = pread->psc->dpy;
 187    Drawable readable;
 188    XImage *ximage;
 189
 190    readable = pread->xDrawable;
 191
 192    ximage = prp->ximage;
 193    ximage->data = data;
 194    ximage->width = w;
 195    ximage->height = h;
 196    ximage->bytes_per_line = stride ? stride : bytes_per_line(w * ximage->bits_per_pixel, 32);
 197
 198    XGetSubImage(dpy, readable, x, y, w, h, ~0L, ZPixmap, ximage, 0, 0);
 199
 200    ximage->data = NULL;
 201 }
 202
 203 static void
 204 swrastGetImage(__DRIdrawable * read,
 205                int x, int y, int w, int h,
 206                char *data, void *loaderPrivate)
 207 {
 208    swrastGetImage2(read, x, y, w, h, 0, data, loaderPrivate);
 209 }
 210
 211 static const __DRIswrastLoaderExtension swrastLoaderExtension = {
 212    .base = {__DRI_SWRAST_LOADER, 3 },
 213
 214    .getDrawableInfo     = swrastGetDrawableInfo,
 215    .putImage            = swrastPutImage,
 216    .getImage            = swrastGetImage,
 217    .putImage2           = swrastPutImage2,
 218    .getImage2           = swrastGetImage2,
 219 };
 220
 221 static const __DRIextension *loader_extensions[] = {
 222    &systemTimeExtension.base,
 223    &swrastLoaderExtension.base,
 224    NULL
 225 };
 226
 227 /**
 228  * GLXDRI functions
 229  */
 230
 231 static void
 232 drisw_destroy_context(struct glx_context *context)
 233 {
 234    struct drisw_context *pcp = (struct drisw_context *) context;
 235    struct drisw_screen *psc = (struct drisw_screen *) context->psc;
 236
 237    driReleaseDrawables(&pcp->base);
 238
 239    free((char *) context->extensions);
 240
 241    (*psc->core->destroyContext) (pcp->driContext);
 242
 243    free(pcp);
 244 }
 245
 246 static int
 247 drisw_bind_context(struct glx_context *context, struct glx_context *old,
 248                    GLXDrawable draw, GLXDrawable read)
 249 {
 250    struct drisw_context *pcp = (struct drisw_context *) context;
 251    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 252    struct drisw_drawable *pdraw, *pread;
 253
 254    pdraw = (struct drisw_drawable *) driFetchDrawable(context, draw);
 255    pread = (struct drisw_drawable *) driFetchDrawable(context, read);
 256
 257    driReleaseDrawables(&pcp->base);
 258
 259    if (pdraw == NULL || pread == NULL)
 260       return GLXBadDrawable;
 261
 262    if ((*psc->core->bindContext) (pcp->driContext,
 263                                   pdraw->driDrawable, pread->driDrawable))
 264       return Success;
 265
 266    return GLXBadContext;
 267 }
 268
 269 static void
 270 drisw_unbind_context(struct glx_context *context, struct glx_context *new)
 271 {
 272    struct drisw_context *pcp = (struct drisw_context *) context;
 273    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 274
 275    (*psc->core->unbindContext) (pcp->driContext);
 276 }
 277
 278 static void
 279 drisw_bind_tex_image(Display * dpy,
 280                     GLXDrawable drawable,
 281                     int buffer, const int *attrib_list)
 282 {
 283    struct glx_context *gc = __glXGetCurrentContext();
 284    struct drisw_context *pcp = (struct drisw_context *) gc;
 285    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 286    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 287    struct drisw_screen *psc;
 288
 289    __glXInitialize(dpy);
 290
 291    if (pdraw != NULL) {
 292       psc = (struct drisw_screen *) base->psc;
 293
 294       if (!psc->texBuffer)
 295          return;
 296
 297       if (psc->texBuffer->base.version >= 2 &&
 298         psc->texBuffer->setTexBuffer2 != NULL) {
 299               (*psc->texBuffer->setTexBuffer2) (pcp->driContext,
 300                                            pdraw->base.textureTarget,
 301                                            pdraw->base.textureFormat,
 302                                            pdraw->driDrawable);
 303       }
 304       else {
 305               (*psc->texBuffer->setTexBuffer) (pcp->driContext,
 306                                           pdraw->base.textureTarget,
 307                                           pdraw->driDrawable);
 308       }
 309    }
 310 }
 311
 312 static void
 313 drisw_release_tex_image(Display * dpy, GLXDrawable drawable, int buffer)
 314 {
 315    struct glx_context *gc = __glXGetCurrentContext();
 316    struct drisw_context *pcp = (struct drisw_context *) gc;
 317    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 318    struct glx_display *dpyPriv = __glXInitialize(dpy);
 319    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 320    struct drisw_screen *psc;
 321
 322    if (dpyPriv != NULL && pdraw != NULL) {
 323       psc = (struct drisw_screen *) base->psc;
 324
 325       if (!psc->texBuffer)
 326          return;
 327
 328       if (psc->texBuffer->base.version >= 3 &&
 329           psc->texBuffer->releaseTexBuffer != NULL) {
 330          (*psc->texBuffer->releaseTexBuffer) (pcp->driContext,
 331                                            pdraw->base.textureTarget,
 332                                            pdraw->driDrawable);
 333       }
 334    }
 335 }
 336
 337 static const struct glx_context_vtable drisw_context_vtable = {
 338    .destroy             = drisw_destroy_context,
 339    .bind                = drisw_bind_context,
 340    .unbind              = drisw_unbind_context,
 341    .wait_gl             = NULL,
 342    .wait_x              = NULL,
 343    .use_x_font          = DRI_glXUseXFont,
 344    .bind_tex_image      = drisw_bind_tex_image,
 345    .release_tex_image   = drisw_release_tex_image,
 346    .get_proc_address    = NULL,
 347 };
 348
 349 static struct glx_context *
 350 drisw_create_context(struct glx_screen *base,
 351                      struct glx_config *config_base,
 352                      struct glx_context *shareList, int renderType)
 353 {
 354    struct drisw_context *pcp, *pcp_shared;
 355    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 356    struct drisw_screen *psc = (struct drisw_screen *) base;
 357    __DRIcontext *shared = NULL;
 358
 359    if (!psc->base.driScreen)
 360       return NULL;
 361
 362    /* Check the renderType value */
 363    if (!validate_renderType_against_config(config_base, renderType))
 364        return NULL;
 365
 366    if (shareList) {
 367       /* If the shareList context is not a DRISW context, we cannot possibly
 368        * create a DRISW context that shares it.
 369        */
 370       if (shareList->vtable->destroy != drisw_destroy_context) {
 371          return NULL;
 372       }
 373
 374       pcp_shared = (struct drisw_context *) shareList;
 375       shared = pcp_shared->driContext;
 376    }
 377
 378    pcp = calloc(1, sizeof *pcp);
 379    if (pcp == NULL)
 380       return NULL;
 381
 382    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 383       free(pcp);
 384       return NULL;
 385    }
 386
 387    pcp->base.renderType = renderType;
 388
 389    pcp->driContext =
 390       (*psc->core->createNewContext) (psc->driScreen,
 391                                       config->driConfig, shared, pcp);
 392    if (pcp->driContext == NULL) {
 393       free(pcp);
 394       return NULL;
 395    }
 396
 397    pcp->base.vtable = &drisw_context_vtable;
 398
 399    return &pcp->base;
 400 }
 401
 402 static struct glx_context *
 403 drisw_create_context_attribs(struct glx_screen *base,
 404                              struct glx_config *config_base,
 405                              struct glx_context *shareList,
 406                              unsigned num_attribs,
 407                              const uint32_t *attribs,
 408                              unsigned *error)
 409 {
 410    struct drisw_context *pcp, *pcp_shared;
 411    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 412    struct drisw_screen *psc = (struct drisw_screen *) base;
 413    __DRIcontext *shared = NULL;
 414
 415    uint32_t minor_ver;
 416    uint32_t major_ver;
 417    uint32_t renderType;
 418    uint32_t flags;
 419    unsigned api;
 420    int reset;
 421    uint32_t ctx_attribs[2 * 4];
 422    unsigned num_ctx_attribs = 0;
 423
 424    if (!psc->base.driScreen)
 425       return NULL;
 426
 427    if (psc->swrast->base.version < 3)
 428       return NULL;
 429
 430    /* Remap the GLX tokens to DRI2 tokens.
 431     */
 432    if (!dri2_convert_glx_attribs(num_attribs, attribs,
 433                                  &major_ver, &minor_ver, &renderType, &flags,
 434                                  &api, &reset, error))
 435       return NULL;
 436
 437    /* Check the renderType value */
 438    if (!validate_renderType_against_config(config_base, renderType)) {
 439        return NULL;
 440    }
 441
 442    if (reset != __DRI_CTX_RESET_NO_NOTIFICATION)
 443       return NULL;
 444
 445    if (shareList) {
 446       pcp_shared = (struct drisw_context *) shareList;
 447       shared = pcp_shared->driContext;
 448    }
 449
 450    pcp = calloc(1, sizeof *pcp);
 451    if (pcp == NULL)
 452       return NULL;
 453
 454    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 455       free(pcp);
 456       return NULL;
 457    }
 458
 459    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MAJOR_VERSION;
 460    ctx_attribs[num_ctx_attribs++] = major_ver;
 461    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MINOR_VERSION;
 462    ctx_attribs[num_ctx_attribs++] = minor_ver;
 463
 464    if (flags != 0) {
 465       ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_FLAGS;
 466
 467       /* The current __DRI_CTX_FLAG_* values are identical to the
 468        * GLX_CONTEXT_*_BIT values.
 469        */
 470       ctx_attribs[num_ctx_attribs++] = flags;
 471    }
 472
 473    pcp->base.renderType = renderType;
 474
 475    pcp->driContext =
 476       (*psc->swrast->createContextAttribs) (psc->driScreen,
 477                                             api,
 478                                             config->driConfig,
 479                                             shared,
 480                                             num_ctx_attribs / 2,
 481                                             ctx_attribs,
 482                                             error,
 483                                             pcp);
 484    if (pcp->driContext == NULL) {
 485       free(pcp);
 486       return NULL;
 487    }
 488
 489    pcp->base.vtable = &drisw_context_vtable;
 490
 491    return &pcp->base;
 492 }
 493
 494 static void
 495 driswDestroyDrawable(__GLXDRIdrawable * pdraw)
 496 {
 497    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 498    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 499
 500    (*psc->core->destroyDrawable) (pdp->driDrawable);
 501
 502    XDestroyDrawable(pdp, pdraw->psc->dpy, pdraw->drawable);
 503    free(pdp);
 504 }
 505
 506 static __GLXDRIdrawable *
 507 driswCreateDrawable(struct glx_screen *base, XID xDrawable,
 508                     GLXDrawable drawable, struct glx_config *modes)
 509 {
 510    struct drisw_drawable *pdp;
 511    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) modes;
 512    struct drisw_screen *psc = (struct drisw_screen *) base;
 513    Bool ret;
 514    const __DRIswrastExtension *swrast = psc->swrast;
 515
 516    pdp = calloc(1, sizeof(*pdp));
 517    if (!pdp)
 518       return NULL;
 519
 520    pdp->base.xDrawable = xDrawable;
 521    pdp->base.drawable = drawable;
 522    pdp->base.psc = &psc->base;
 523
 524    ret = XCreateDrawable(pdp, psc->base.dpy, xDrawable, modes->visualID);
 525    if (!ret) {
 526       free(pdp);
 527       return NULL;
 528    }
 529
 530    /* Create a new drawable */
 531    pdp->driDrawable =
 532       (*swrast->createNewDrawable) (psc->driScreen, config->driConfig, pdp);
 533
 534    if (!pdp->driDrawable) {
 535       XDestroyDrawable(pdp, psc->base.dpy, xDrawable);
 536       free(pdp);
 537       return NULL;
 538    }
 539
 540    pdp->base.destroyDrawable = driswDestroyDrawable;
 541
 542    return &pdp->base;
 543 }
 544
 545 static int64_t
 546 driswSwapBuffers(__GLXDRIdrawable * pdraw,
 547                  int64_t target_msc, int64_t divisor, int64_t remainder,
 548                  Bool flush)
 549 {
 550    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 551    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 552
 553    (void) target_msc;
 554    (void) divisor;
 555    (void) remainder;
 556
 557    if (flush) {
 558       glFlush();
 559    }
 560
 561    (*psc->core->swapBuffers) (pdp->driDrawable);
 562
 563    return 0;
 564 }
 565
 566 static void
 567 driswCopySubBuffer(__GLXDRIdrawable * pdraw,
 568                    int x, int y, int width, int height, Bool flush)
 569 {
 570    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 571    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 572
 573    if (flush) {
 574       glFlush();
 575    }
 576
 577    (*psc->copySubBuffer->copySubBuffer) (pdp->driDrawable,
 578                                             x, y, width, height);
 579 }
 580
 581 static void
 582 driswDestroyScreen(struct glx_screen *base)
 583 {
 584    struct drisw_screen *psc = (struct drisw_screen *) base;
 585
 586    /* Free the direct rendering per screen data */
 587    (*psc->core->destroyScreen) (psc->driScreen);
 588    driDestroyConfigs(psc->driver_configs);
 589    psc->driScreen = NULL;
 590    if (psc->driver)
 591       dlclose(psc->driver);
 592    free(psc);
 593 }
 594
 595 #define SWRAST_DRIVER_NAME "swrast"
 596
 597 static void *
 598 driOpenSwrast(void)
 599 {
 600    void *driver = NULL;
 601
 602    if (driver == NULL)
 603       driver = driOpenDriver(SWRAST_DRIVER_NAME);
 604
 605    return driver;
 606 }
 607
 608 static const struct glx_screen_vtable drisw_screen_vtable = {
 609    .create_context         = drisw_create_context,
 610    .create_context_attribs = drisw_create_context_attribs,
 611    .query_renderer_integer = drisw_query_renderer_integer,
 612    .query_renderer_string  = drisw_query_renderer_string,
 613 };
 614
 615 static void
 616 driswBindExtensions(struct drisw_screen *psc, const __DRIextension **extensions)
 617 {
 618    int i;
 619
 620    __glXEnableDirectExtension(&psc->base, "GLX_SGI_make_current_read");
 621
 622    if (psc->swrast->base.version >= 3) {
 623       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
 624       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context_profile");
 625
 626       /* DRISW version >= 2 implies support for OpenGL ES 2.0.
 627        */
 628       __glXEnableDirectExtension(&psc->base,
 629                                  "GLX_EXT_create_context_es2_profile");
 630    }
 631
 632    if (psc->copySubBuffer)
 633       __glXEnableDirectExtension(&psc->base, "GLX_MESA_copy_sub_buffer");
 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       /* DRISW version 3 is also required because GLX_MESA_query_renderer
 642        * requires GLX_ARB_create_context_profile.
 643        */
 644       if (psc->swrast->base.version >= 3
 645           && strcmp(extensions[i]->name, __DRI2_RENDERER_QUERY) == 0) {
 646          psc->rendererQuery = (__DRI2rendererQueryExtension *) extensions[i];
 647          __glXEnableDirectExtension(&psc->base, "GLX_MESA_query_renderer");
 648       }
 649    }
 650 }
 651
 652 static struct glx_screen *
 653 driswCreateScreen(int screen, struct glx_display *priv)
 654 {
 655    __GLXDRIscreen *psp;
 656    const __DRIconfig **driver_configs;
 657    const __DRIextension **extensions;
 658    struct drisw_screen *psc;
 659    struct glx_config *configs = NULL, *visuals = NULL;
 660    int i;
 661
 662    psc = calloc(1, sizeof *psc);
 663    if (psc == NULL)
 664       return NULL;
 665
 666    if (!glx_screen_init(&psc->base, screen, priv)) {
 667       free(psc);
 668       return NULL;
 669    }
 670
 671    psc->driver = driOpenSwrast();
 672    if (psc->driver == NULL)
 673       goto handle_error;
 674
 675    extensions = driGetDriverExtensions(psc->driver, SWRAST_DRIVER_NAME);
 676    if (extensions == NULL)
 677       goto handle_error;
 678
 679    for (i = 0; extensions[i]; i++) {
 680       if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
 681          psc->core = (__DRIcoreExtension *) extensions[i];
 682       if (strcmp(extensions[i]->name, __DRI_SWRAST) == 0)
 683          psc->swrast = (__DRIswrastExtension *) extensions[i];
 684       if (strcmp(extensions[i]->name, __DRI_COPY_SUB_BUFFER) == 0)
 685          psc->copySubBuffer = (__DRIcopySubBufferExtension *) extensions[i];
 686    }
 687
 688    if (psc->core == NULL || psc->swrast == NULL) {
 689       ErrorMessageF("core dri extension not found\n");
 690       goto handle_error;
 691    }
 692
 693    if (psc->swrast->base.version >= 4) {
 694       psc->driScreen =
 695          psc->swrast->createNewScreen2(screen, loader_extensions,
 696                                        extensions,
 697                                        &driver_configs, psc);
 698    } else {
 699       psc->driScreen =
 700          psc->swrast->createNewScreen(screen, loader_extensions,
 701                                       &driver_configs, psc);
 702    }
 703    if (psc->driScreen == NULL) {
 704       ErrorMessageF("failed to create dri screen\n");
 705       goto handle_error;
 706    }
 707
 708    extensions = psc->core->getExtensions(psc->driScreen);
 709    driswBindExtensions(psc, extensions);
 710
 711    configs = driConvertConfigs(psc->core, psc->base.configs, driver_configs);
 712    visuals = driConvertConfigs(psc->core, psc->base.visuals, driver_configs);
 713
 714    if (!configs || !visuals) {
 715        ErrorMessageF("No matching fbConfigs or visuals found\n");
 716        goto handle_error;
 717    }
 718
 719    glx_config_destroy_list(psc->base.configs);
 720    psc->base.configs = configs;
 721    glx_config_destroy_list(psc->base.visuals);
 722    psc->base.visuals = visuals;
 723
 724    psc->driver_configs = driver_configs;
 725
 726    psc->base.vtable = &drisw_screen_vtable;
 727    psp = &psc->vtable;
 728    psc->base.driScreen = psp;
 729    psp->destroyScreen = driswDestroyScreen;
 730    psp->createDrawable = driswCreateDrawable;
 731    psp->swapBuffers = driswSwapBuffers;
 732
 733    if (psc->copySubBuffer)
 734       psp->copySubBuffer = driswCopySubBuffer;
 735
 736    return &psc->base;
 737
 738  handle_error:
 739    if (configs)
 740        glx_config_destroy_list(configs);
 741    if (visuals)
 742        glx_config_destroy_list(visuals);
 743    if (psc->driScreen)
 744        psc->core->destroyScreen(psc->driScreen);
 745    psc->driScreen = NULL;
 746
 747    if (psc->driver)
 748       dlclose(psc->driver);
 749    glx_screen_cleanup(&psc->base);
 750    free(psc);
 751
 752    CriticalErrorMessageF("failed to load driver: %s\n", SWRAST_DRIVER_NAME);
 753
 754    return NULL;
 755 }
 756
 757 /* Called from __glXFreeDisplayPrivate.
 758  */
 759 static void
 760 driswDestroyDisplay(__GLXDRIdisplay * dpy)
 761 {
 762    free(dpy);
 763 }
 764
 765 /*
 766  * Allocate, initialize and return a __DRIdisplayPrivate object.
 767  * This is called from __glXInitialize() when we are given a new
 768  * display pointer.
 769  */
 770 _X_HIDDEN __GLXDRIdisplay *
 771 driswCreateDisplay(Display * dpy)
 772 {
 773    struct drisw_display *pdpyp;
 774
 775    pdpyp = malloc(sizeof *pdpyp);
 776    if (pdpyp == NULL)
 777       return NULL;
 778
 779    pdpyp->base.destroyDisplay = driswDestroyDisplay;
 780    pdpyp->base.createScreen = driswCreateScreen;
 781
 782    return &pdpyp->base;
 783 }
 784
 785 #endif /* GLX_DIRECT_RENDERING */