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    .base = {__DRI_SWRAST_LOADER, 2 },
 244
 245    .getDrawableInfo     = swrastGetDrawableInfo,
 246    .putImage            = swrastPutImage,
 247    .getImage            = swrastGetImage,
 248    .putImage2           = swrastPutImage2,
 249 };
 250
 251 static const __DRIextension *loader_extensions[] = {
 252    &systemTimeExtension.base,
 253    &swrastLoaderExtension.base,
 254    NULL
 255 };
 256
 257 /**
 258  * GLXDRI functions
 259  */
 260
 261 static void
 262 drisw_destroy_context(struct glx_context *context)
 263 {
 264    struct drisw_context *pcp = (struct drisw_context *) context;
 265    struct drisw_screen *psc = (struct drisw_screen *) context->psc;
 266
 267    driReleaseDrawables(&pcp->base);
 268
 269    free((char *) context->extensions);
 270
 271    (*psc->core->destroyContext) (pcp->driContext);
 272
 273    free(pcp);
 274 }
 275
 276 static int
 277 drisw_bind_context(struct glx_context *context, struct glx_context *old,
 278                    GLXDrawable draw, GLXDrawable read)
 279 {
 280    struct drisw_context *pcp = (struct drisw_context *) context;
 281    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 282    struct drisw_drawable *pdraw, *pread;
 283
 284    pdraw = (struct drisw_drawable *) driFetchDrawable(context, draw);
 285    pread = (struct drisw_drawable *) driFetchDrawable(context, read);
 286
 287    driReleaseDrawables(&pcp->base);
 288
 289    if (pdraw == NULL || pread == NULL)
 290       return GLXBadDrawable;
 291
 292    if ((*psc->core->bindContext) (pcp->driContext,
 293                                   pdraw->driDrawable, pread->driDrawable))
 294       return Success;
 295
 296    return GLXBadContext;
 297 }
 298
 299 static void
 300 drisw_unbind_context(struct glx_context *context, struct glx_context *new)
 301 {
 302    struct drisw_context *pcp = (struct drisw_context *) context;
 303    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 304
 305    (*psc->core->unbindContext) (pcp->driContext);
 306 }
 307
 308 static void
 309 drisw_bind_tex_image(Display * dpy,
 310                     GLXDrawable drawable,
 311                     int buffer, const int *attrib_list)
 312 {
 313    struct glx_context *gc = __glXGetCurrentContext();
 314    struct drisw_context *pcp = (struct drisw_context *) gc;
 315    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 316    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 317    struct drisw_screen *psc;
 318
 319    __glXInitialize(dpy);
 320
 321    if (pdraw != NULL) {
 322       psc = (struct drisw_screen *) base->psc;
 323
 324       if (!psc->texBuffer)
 325          return;
 326
 327       if (psc->texBuffer->base.version >= 2 &&
 328         psc->texBuffer->setTexBuffer2 != NULL) {
 329               (*psc->texBuffer->setTexBuffer2) (pcp->driContext,
 330                                            pdraw->base.textureTarget,
 331                                            pdraw->base.textureFormat,
 332                                            pdraw->driDrawable);
 333       }
 334       else {
 335               (*psc->texBuffer->setTexBuffer) (pcp->driContext,
 336                                           pdraw->base.textureTarget,
 337                                           pdraw->driDrawable);
 338       }
 339    }
 340 }
 341
 342 static void
 343 drisw_release_tex_image(Display * dpy, GLXDrawable drawable, int buffer)
 344 {
 345    struct glx_context *gc = __glXGetCurrentContext();
 346    struct drisw_context *pcp = (struct drisw_context *) gc;
 347    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 348    struct glx_display *dpyPriv = __glXInitialize(dpy);
 349    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 350    struct drisw_screen *psc;
 351
 352    if (dpyPriv != NULL && pdraw != NULL) {
 353       psc = (struct drisw_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 }
 366
 367 static const struct glx_context_vtable drisw_context_vtable = {
 368    .destroy             = drisw_destroy_context,
 369    .bind                = drisw_bind_context,
 370    .unbind              = drisw_unbind_context,
 371    .wait_gl             = NULL,
 372    .wait_x              = NULL,
 373    .use_x_font          = DRI_glXUseXFont,
 374    .bind_tex_image      = drisw_bind_tex_image,
 375    .release_tex_image   = drisw_release_tex_image,
 376    .get_proc_address    = NULL,
 377 };
 378
 379 static struct glx_context *
 380 drisw_create_context(struct glx_screen *base,
 381                      struct glx_config *config_base,
 382                      struct glx_context *shareList, int renderType)
 383 {
 384    struct drisw_context *pcp, *pcp_shared;
 385    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 386    struct drisw_screen *psc = (struct drisw_screen *) base;
 387    __DRIcontext *shared = NULL;
 388
 389    if (!psc->base.driScreen)
 390       return NULL;
 391
 392    /* Check the renderType value */
 393    if (!validate_renderType_against_config(config_base, renderType))
 394        return NULL;
 395
 396    if (shareList) {
 397       /* If the shareList context is not a DRISW context, we cannot possibly
 398        * create a DRISW context that shares it.
 399        */
 400       if (shareList->vtable->destroy != drisw_destroy_context) {
 401          return NULL;
 402       }
 403
 404       pcp_shared = (struct drisw_context *) shareList;
 405       shared = pcp_shared->driContext;
 406    }
 407
 408    pcp = calloc(1, sizeof *pcp);
 409    if (pcp == NULL)
 410       return NULL;
 411
 412    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 413       free(pcp);
 414       return NULL;
 415    }
 416
 417    pcp->base.renderType = renderType;
 418
 419    pcp->driContext =
 420       (*psc->core->createNewContext) (psc->driScreen,
 421                                       config->driConfig, shared, pcp);
 422    if (pcp->driContext == NULL) {
 423       free(pcp);
 424       return NULL;
 425    }
 426
 427    pcp->base.vtable = &drisw_context_vtable;
 428
 429    return &pcp->base;
 430 }
 431
 432 static struct glx_context *
 433 drisw_create_context_attribs(struct glx_screen *base,
 434                              struct glx_config *config_base,
 435                              struct glx_context *shareList,
 436                              unsigned num_attribs,
 437                              const uint32_t *attribs,
 438                              unsigned *error)
 439 {
 440    struct drisw_context *pcp, *pcp_shared;
 441    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 442    struct drisw_screen *psc = (struct drisw_screen *) base;
 443    __DRIcontext *shared = NULL;
 444
 445    uint32_t minor_ver;
 446    uint32_t major_ver;
 447    uint32_t renderType;
 448    uint32_t flags;
 449    unsigned api;
 450    int reset;
 451    uint32_t ctx_attribs[2 * 4];
 452    unsigned num_ctx_attribs = 0;
 453
 454    if (!psc->base.driScreen)
 455       return NULL;
 456
 457    if (psc->swrast->base.version < 3)
 458       return NULL;
 459
 460    /* Remap the GLX tokens to DRI2 tokens.
 461     */
 462    if (!dri2_convert_glx_attribs(num_attribs, attribs,
 463                                  &major_ver, &minor_ver, &renderType, &flags,
 464                                  &api, &reset, error))
 465       return NULL;
 466
 467    /* Check the renderType value */
 468    if (!validate_renderType_against_config(config_base, renderType)) {
 469        return NULL;
 470    }
 471
 472    if (reset != __DRI_CTX_RESET_NO_NOTIFICATION)
 473       return NULL;
 474
 475    if (shareList) {
 476       pcp_shared = (struct drisw_context *) shareList;
 477       shared = pcp_shared->driContext;
 478    }
 479
 480    pcp = calloc(1, sizeof *pcp);
 481    if (pcp == NULL)
 482       return NULL;
 483
 484    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 485       free(pcp);
 486       return NULL;
 487    }
 488
 489    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MAJOR_VERSION;
 490    ctx_attribs[num_ctx_attribs++] = major_ver;
 491    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MINOR_VERSION;
 492    ctx_attribs[num_ctx_attribs++] = minor_ver;
 493
 494    if (flags != 0) {
 495       ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_FLAGS;
 496
 497       /* The current __DRI_CTX_FLAG_* values are identical to the
 498        * GLX_CONTEXT_*_BIT values.
 499        */
 500       ctx_attribs[num_ctx_attribs++] = flags;
 501    }
 502
 503    pcp->base.renderType = renderType;
 504
 505    pcp->driContext =
 506       (*psc->swrast->createContextAttribs) (psc->driScreen,
 507                                             api,
 508                                             config->driConfig,
 509                                             shared,
 510                                             num_ctx_attribs / 2,
 511                                             ctx_attribs,
 512                                             error,
 513                                             pcp);
 514    if (pcp->driContext == NULL) {
 515       free(pcp);
 516       return NULL;
 517    }
 518
 519    pcp->base.vtable = &drisw_context_vtable;
 520
 521    return &pcp->base;
 522 }
 523
 524 static void
 525 driswDestroyDrawable(__GLXDRIdrawable * pdraw)
 526 {
 527    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 528    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 529
 530    (*psc->core->destroyDrawable) (pdp->driDrawable);
 531
 532    XDestroyDrawable(pdp, pdraw->psc->dpy, pdraw->drawable);
 533    free(pdp);
 534 }
 535
 536 static __GLXDRIdrawable *
 537 driswCreateDrawable(struct glx_screen *base, XID xDrawable,
 538                     GLXDrawable drawable, struct glx_config *modes)
 539 {
 540    struct drisw_drawable *pdp;
 541    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) modes;
 542    struct drisw_screen *psc = (struct drisw_screen *) base;
 543    Bool ret;
 544    const __DRIswrastExtension *swrast = psc->swrast;
 545
 546    pdp = calloc(1, sizeof(*pdp));
 547    if (!pdp)
 548       return NULL;
 549
 550    pdp->base.xDrawable = xDrawable;
 551    pdp->base.drawable = drawable;
 552    pdp->base.psc = &psc->base;
 553
 554    ret = XCreateDrawable(pdp, psc->base.dpy, xDrawable, modes->visualID);
 555    if (!ret) {
 556       free(pdp);
 557       return NULL;
 558    }
 559
 560    /* Create a new drawable */
 561    pdp->driDrawable =
 562       (*swrast->createNewDrawable) (psc->driScreen, config->driConfig, pdp);
 563
 564    if (!pdp->driDrawable) {
 565       XDestroyDrawable(pdp, psc->base.dpy, xDrawable);
 566       free(pdp);
 567       return NULL;
 568    }
 569
 570    pdp->base.destroyDrawable = driswDestroyDrawable;
 571
 572    return &pdp->base;
 573 }
 574
 575 static int64_t
 576 driswSwapBuffers(__GLXDRIdrawable * pdraw,
 577                  int64_t target_msc, int64_t divisor, int64_t remainder,
 578                  Bool flush)
 579 {
 580    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 581    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 582
 583    (void) target_msc;
 584    (void) divisor;
 585    (void) remainder;
 586
 587    if (flush) {
 588       glFlush();
 589    }
 590
 591    (*psc->core->swapBuffers) (pdp->driDrawable);
 592
 593    return 0;
 594 }
 595
 596 static void
 597 driswCopySubBuffer(__GLXDRIdrawable * pdraw,
 598                    int x, int y, int width, int height, Bool flush)
 599 {
 600    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 601    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 602
 603    if (flush) {
 604       glFlush();
 605    }
 606
 607    (*psc->copySubBuffer->copySubBuffer) (pdp->driDrawable,
 608                                             x, y, width, height);
 609 }
 610
 611 static void
 612 driswDestroyScreen(struct glx_screen *base)
 613 {
 614    struct drisw_screen *psc = (struct drisw_screen *) base;
 615
 616    /* Free the direct rendering per screen data */
 617    (*psc->core->destroyScreen) (psc->driScreen);
 618    driDestroyConfigs(psc->driver_configs);
 619    psc->driScreen = NULL;
 620    if (psc->driver)
 621       dlclose(psc->driver);
 622    free(psc);
 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    .create_context         = drisw_create_context,
 640    .create_context_attribs = drisw_create_context_attribs,
 641    .query_renderer_integer = NULL,
 642    .query_renderer_string  = NULL,
 643 };
 644
 645 static void
 646 driswBindExtensions(struct drisw_screen *psc, const __DRIextension **extensions)
 647 {
 648    int i;
 649
 650    __glXEnableDirectExtension(&psc->base, "GLX_SGI_make_current_read");
 651
 652    if (psc->swrast->base.version >= 3) {
 653       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
 654       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context_profile");
 655
 656       /* DRISW version >= 2 implies support for OpenGL ES 2.0.
 657        */
 658       __glXEnableDirectExtension(&psc->base,
 659                                  "GLX_EXT_create_context_es2_profile");
 660    }
 661
 662    if (psc->copySubBuffer)
 663       __glXEnableDirectExtension(&psc->base, "GLX_MESA_copy_sub_buffer");
 664
 665    /* FIXME: Figure out what other extensions can be ported here from dri2. */
 666    for (i = 0; extensions[i]; i++) {
 667       if ((strcmp(extensions[i]->name, __DRI_TEX_BUFFER) == 0)) {
 668          psc->texBuffer = (__DRItexBufferExtension *) extensions[i];
 669          __glXEnableDirectExtension(&psc->base, "GLX_EXT_texture_from_pixmap");
 670       }
 671    }
 672 }
 673
 674 static struct glx_screen *
 675 driswCreateScreen(int screen, struct glx_display *priv)
 676 {
 677    __GLXDRIscreen *psp;
 678    const __DRIconfig **driver_configs;
 679    const __DRIextension **extensions;
 680    struct drisw_screen *psc;
 681    struct glx_config *configs = NULL, *visuals = NULL;
 682    int i;
 683
 684    psc = calloc(1, sizeof *psc);
 685    if (psc == NULL)
 686       return NULL;
 687
 688    if (!glx_screen_init(&psc->base, screen, priv)) {
 689       free(psc);
 690       return NULL;
 691    }
 692
 693    psc->driver = driOpenSwrast();
 694    if (psc->driver == NULL)
 695       goto handle_error;
 696
 697    extensions = driGetDriverExtensions(psc->driver, SWRAST_DRIVER_NAME);
 698    if (extensions == NULL)
 699       goto handle_error;
 700
 701    for (i = 0; extensions[i]; i++) {
 702       if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
 703          psc->core = (__DRIcoreExtension *) extensions[i];
 704       if (strcmp(extensions[i]->name, __DRI_SWRAST) == 0)
 705          psc->swrast = (__DRIswrastExtension *) extensions[i];
 706       if (strcmp(extensions[i]->name, __DRI_COPY_SUB_BUFFER) == 0)
 707          psc->copySubBuffer = (__DRIcopySubBufferExtension *) extensions[i];
 708    }
 709
 710    if (psc->core == NULL || psc->swrast == NULL) {
 711       ErrorMessageF("core dri extension not found\n");
 712       goto handle_error;
 713    }
 714
 715    if (psc->swrast->base.version >= 4) {
 716       psc->driScreen =
 717          psc->swrast->createNewScreen2(screen, loader_extensions,
 718                                        extensions,
 719                                        &driver_configs, psc);
 720    } else {
 721       psc->driScreen =
 722          psc->swrast->createNewScreen(screen, loader_extensions,
 723                                       &driver_configs, psc);
 724    }
 725    if (psc->driScreen == NULL) {
 726       ErrorMessageF("failed to create dri screen\n");
 727       goto handle_error;
 728    }
 729
 730    extensions = psc->core->getExtensions(psc->driScreen);
 731    driswBindExtensions(psc, extensions);
 732
 733    configs = driConvertConfigs(psc->core, psc->base.configs, driver_configs);
 734    visuals = driConvertConfigs(psc->core, psc->base.visuals, driver_configs);
 735
 736    if (!configs || !visuals)
 737        goto handle_error;
 738
 739    glx_config_destroy_list(psc->base.configs);
 740    psc->base.configs = configs;
 741    glx_config_destroy_list(psc->base.visuals);
 742    psc->base.visuals = visuals;
 743
 744    psc->driver_configs = driver_configs;
 745
 746    psc->base.vtable = &drisw_screen_vtable;
 747    psp = &psc->vtable;
 748    psc->base.driScreen = psp;
 749    psp->destroyScreen = driswDestroyScreen;
 750    psp->createDrawable = driswCreateDrawable;
 751    psp->swapBuffers = driswSwapBuffers;
 752
 753    if (psc->copySubBuffer)
 754       psp->copySubBuffer = driswCopySubBuffer;
 755
 756    return &psc->base;
 757
 758  handle_error:
 759    if (configs)
 760        glx_config_destroy_list(configs);
 761    if (visuals)
 762        glx_config_destroy_list(visuals);
 763    if (psc->driScreen)
 764        psc->core->destroyScreen(psc->driScreen);
 765    psc->driScreen = NULL;
 766
 767    if (psc->driver)
 768       dlclose(psc->driver);
 769    glx_screen_cleanup(&psc->base);
 770    free(psc);
 771
 772    CriticalErrorMessageF("failed to load driver: %s\n", SWRAST_DRIVER_NAME);
 773
 774    return NULL;
 775 }
 776
 777 /* Called from __glXFreeDisplayPrivate.
 778  */
 779 static void
 780 driswDestroyDisplay(__GLXDRIdisplay * dpy)
 781 {
 782    free(dpy);
 783 }
 784
 785 /*
 786  * Allocate, initialize and return a __DRIdisplayPrivate object.
 787  * This is called from __glXInitialize() when we are given a new
 788  * display pointer.
 789  */
 790 _X_HIDDEN __GLXDRIdisplay *
 791 driswCreateDisplay(Display * dpy)
 792 {
 793    struct drisw_display *pdpyp;
 794
 795    pdpyp = malloc(sizeof *pdpyp);
 796    if (pdpyp == NULL)
 797       return NULL;
 798
 799    pdpyp->base.destroyDisplay = driswDestroyDisplay;
 800    pdpyp->base.createScreen = driswCreateScreen;
 801
 802    return &pdpyp->base;
 803 }
 804
 805 #endif /* GLX_DIRECT_RENDERING */