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    &swrastLoaderExtension.base,
 223    NULL
 224 };
 225
 226 /**
 227  * GLXDRI functions
 228  */
 229
 230 static void
 231 drisw_destroy_context(struct glx_context *context)
 232 {
 233    struct drisw_context *pcp = (struct drisw_context *) context;
 234    struct drisw_screen *psc = (struct drisw_screen *) context->psc;
 235
 236    driReleaseDrawables(&pcp->base);
 237
 238    free((char *) context->extensions);
 239
 240    (*psc->core->destroyContext) (pcp->driContext);
 241
 242    free(pcp);
 243 }
 244
 245 static int
 246 drisw_bind_context(struct glx_context *context, struct glx_context *old,
 247                    GLXDrawable draw, GLXDrawable read)
 248 {
 249    struct drisw_context *pcp = (struct drisw_context *) context;
 250    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 251    struct drisw_drawable *pdraw, *pread;
 252
 253    pdraw = (struct drisw_drawable *) driFetchDrawable(context, draw);
 254    pread = (struct drisw_drawable *) driFetchDrawable(context, read);
 255
 256    driReleaseDrawables(&pcp->base);
 257
 258    if ((*psc->core->bindContext) (pcp->driContext,
 259                                   pdraw ? pdraw->driDrawable : NULL,
 260                                   pread ? pread->driDrawable : NULL))
 261       return Success;
 262
 263    return GLXBadContext;
 264 }
 265
 266 static void
 267 drisw_unbind_context(struct glx_context *context, struct glx_context *new)
 268 {
 269    struct drisw_context *pcp = (struct drisw_context *) context;
 270    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 271
 272    (*psc->core->unbindContext) (pcp->driContext);
 273 }
 274
 275 static void
 276 drisw_bind_tex_image(Display * dpy,
 277                     GLXDrawable drawable,
 278                     int buffer, const int *attrib_list)
 279 {
 280    struct glx_context *gc = __glXGetCurrentContext();
 281    struct drisw_context *pcp = (struct drisw_context *) gc;
 282    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 283    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 284    struct drisw_screen *psc;
 285
 286    __glXInitialize(dpy);
 287
 288    if (pdraw != NULL) {
 289       psc = (struct drisw_screen *) base->psc;
 290
 291       if (!psc->texBuffer)
 292          return;
 293
 294       if (psc->texBuffer->base.version >= 2 &&
 295         psc->texBuffer->setTexBuffer2 != NULL) {
 296               (*psc->texBuffer->setTexBuffer2) (pcp->driContext,
 297                                            pdraw->base.textureTarget,
 298                                            pdraw->base.textureFormat,
 299                                            pdraw->driDrawable);
 300       }
 301       else {
 302               (*psc->texBuffer->setTexBuffer) (pcp->driContext,
 303                                           pdraw->base.textureTarget,
 304                                           pdraw->driDrawable);
 305       }
 306    }
 307 }
 308
 309 static void
 310 drisw_release_tex_image(Display * dpy, GLXDrawable drawable, int buffer)
 311 {
 312    struct glx_context *gc = __glXGetCurrentContext();
 313    struct drisw_context *pcp = (struct drisw_context *) gc;
 314    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 315    struct glx_display *dpyPriv = __glXInitialize(dpy);
 316    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 317    struct drisw_screen *psc;
 318
 319    if (dpyPriv != NULL && pdraw != NULL) {
 320       psc = (struct drisw_screen *) base->psc;
 321
 322       if (!psc->texBuffer)
 323          return;
 324
 325       if (psc->texBuffer->base.version >= 3 &&
 326           psc->texBuffer->releaseTexBuffer != NULL) {
 327          (*psc->texBuffer->releaseTexBuffer) (pcp->driContext,
 328                                            pdraw->base.textureTarget,
 329                                            pdraw->driDrawable);
 330       }
 331    }
 332 }
 333
 334 static const struct glx_context_vtable drisw_context_vtable = {
 335    .destroy             = drisw_destroy_context,
 336    .bind                = drisw_bind_context,
 337    .unbind              = drisw_unbind_context,
 338    .wait_gl             = NULL,
 339    .wait_x              = NULL,
 340    .use_x_font          = DRI_glXUseXFont,
 341    .bind_tex_image      = drisw_bind_tex_image,
 342    .release_tex_image   = drisw_release_tex_image,
 343    .get_proc_address    = NULL,
 344 };
 345
 346 static struct glx_context *
 347 drisw_create_context(struct glx_screen *base,
 348                      struct glx_config *config_base,
 349                      struct glx_context *shareList, int renderType)
 350 {
 351    struct drisw_context *pcp, *pcp_shared;
 352    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 353    struct drisw_screen *psc = (struct drisw_screen *) base;
 354    __DRIcontext *shared = NULL;
 355
 356    if (!psc->base.driScreen)
 357       return NULL;
 358
 359    /* Check the renderType value */
 360    if (!validate_renderType_against_config(config_base, renderType))
 361        return NULL;
 362
 363    if (shareList) {
 364       /* If the shareList context is not a DRISW context, we cannot possibly
 365        * create a DRISW context that shares it.
 366        */
 367       if (shareList->vtable->destroy != drisw_destroy_context) {
 368          return NULL;
 369       }
 370
 371       pcp_shared = (struct drisw_context *) shareList;
 372       shared = pcp_shared->driContext;
 373    }
 374
 375    pcp = calloc(1, sizeof *pcp);
 376    if (pcp == NULL)
 377       return NULL;
 378
 379    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 380       free(pcp);
 381       return NULL;
 382    }
 383
 384    pcp->base.renderType = renderType;
 385
 386    pcp->driContext =
 387       (*psc->core->createNewContext) (psc->driScreen,
 388                                       config->driConfig, shared, pcp);
 389    if (pcp->driContext == NULL) {
 390       free(pcp);
 391       return NULL;
 392    }
 393
 394    pcp->base.vtable = &drisw_context_vtable;
 395
 396    return &pcp->base;
 397 }
 398
 399 static struct glx_context *
 400 drisw_create_context_attribs(struct glx_screen *base,
 401                              struct glx_config *config_base,
 402                              struct glx_context *shareList,
 403                              unsigned num_attribs,
 404                              const uint32_t *attribs,
 405                              unsigned *error)
 406 {
 407    struct drisw_context *pcp, *pcp_shared;
 408    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 409    struct drisw_screen *psc = (struct drisw_screen *) base;
 410    __DRIcontext *shared = NULL;
 411
 412    uint32_t minor_ver;
 413    uint32_t major_ver;
 414    uint32_t renderType;
 415    uint32_t flags;
 416    unsigned api;
 417    int reset;
 418    int release;
 419    uint32_t ctx_attribs[2 * 5];
 420    unsigned num_ctx_attribs = 0;
 421
 422    if (!psc->base.driScreen)
 423       return NULL;
 424
 425    if (psc->swrast->base.version < 3)
 426       return NULL;
 427
 428    /* Remap the GLX tokens to DRI2 tokens.
 429     */
 430    if (!dri2_convert_glx_attribs(num_attribs, attribs,
 431                                  &major_ver, &minor_ver, &renderType, &flags,
 432                                  &api, &reset, &release, error))
 433       return NULL;
 434
 435    /* Check the renderType value */
 436    if (!validate_renderType_against_config(config_base, renderType)) {
 437        return NULL;
 438    }
 439
 440    if (reset != __DRI_CTX_RESET_NO_NOTIFICATION)
 441       return NULL;
 442
 443    if (release != __DRI_CTX_RELEASE_BEHAVIOR_FLUSH &&
 444        release != __DRI_CTX_RELEASE_BEHAVIOR_NONE)
 445       return NULL;
 446
 447    if (shareList) {
 448       pcp_shared = (struct drisw_context *) shareList;
 449       shared = pcp_shared->driContext;
 450    }
 451
 452    pcp = calloc(1, sizeof *pcp);
 453    if (pcp == NULL)
 454       return NULL;
 455
 456    if (!glx_context_init(&pcp->base, &psc->base, config_base)) {
 457       free(pcp);
 458       return NULL;
 459    }
 460
 461    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MAJOR_VERSION;
 462    ctx_attribs[num_ctx_attribs++] = major_ver;
 463    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MINOR_VERSION;
 464    ctx_attribs[num_ctx_attribs++] = minor_ver;
 465    if (release != __DRI_CTX_RELEASE_BEHAVIOR_FLUSH) {
 466        ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_RELEASE_BEHAVIOR;
 467        ctx_attribs[num_ctx_attribs++] = release;
 468    }
 469
 470    if (flags != 0) {
 471       ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_FLAGS;
 472
 473       /* The current __DRI_CTX_FLAG_* values are identical to the
 474        * GLX_CONTEXT_*_BIT values.
 475        */
 476       ctx_attribs[num_ctx_attribs++] = flags;
 477    }
 478
 479    pcp->base.renderType = renderType;
 480
 481    pcp->driContext =
 482       (*psc->swrast->createContextAttribs) (psc->driScreen,
 483                                             api,
 484                                             config ? config->driConfig : 0,
 485                                             shared,
 486                                             num_ctx_attribs / 2,
 487                                             ctx_attribs,
 488                                             error,
 489                                             pcp);
 490    if (pcp->driContext == NULL) {
 491       free(pcp);
 492       return NULL;
 493    }
 494
 495    pcp->base.vtable = &drisw_context_vtable;
 496
 497    return &pcp->base;
 498 }
 499
 500 static void
 501 driswDestroyDrawable(__GLXDRIdrawable * pdraw)
 502 {
 503    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 504    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 505
 506    (*psc->core->destroyDrawable) (pdp->driDrawable);
 507
 508    XDestroyDrawable(pdp, pdraw->psc->dpy, pdraw->drawable);
 509    free(pdp);
 510 }
 511
 512 static __GLXDRIdrawable *
 513 driswCreateDrawable(struct glx_screen *base, XID xDrawable,
 514                     GLXDrawable drawable, struct glx_config *modes)
 515 {
 516    struct drisw_drawable *pdp;
 517    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) modes;
 518    struct drisw_screen *psc = (struct drisw_screen *) base;
 519    Bool ret;
 520    const __DRIswrastExtension *swrast = psc->swrast;
 521
 522    pdp = calloc(1, sizeof(*pdp));
 523    if (!pdp)
 524       return NULL;
 525
 526    pdp->base.xDrawable = xDrawable;
 527    pdp->base.drawable = drawable;
 528    pdp->base.psc = &psc->base;
 529
 530    ret = XCreateDrawable(pdp, psc->base.dpy, xDrawable, modes->visualID);
 531    if (!ret) {
 532       free(pdp);
 533       return NULL;
 534    }
 535
 536    /* Create a new drawable */
 537    pdp->driDrawable =
 538       (*swrast->createNewDrawable) (psc->driScreen, config->driConfig, pdp);
 539
 540    if (!pdp->driDrawable) {
 541       XDestroyDrawable(pdp, psc->base.dpy, xDrawable);
 542       free(pdp);
 543       return NULL;
 544    }
 545
 546    pdp->base.destroyDrawable = driswDestroyDrawable;
 547
 548    return &pdp->base;
 549 }
 550
 551 static int64_t
 552 driswSwapBuffers(__GLXDRIdrawable * pdraw,
 553                  int64_t target_msc, int64_t divisor, int64_t remainder,
 554                  Bool flush)
 555 {
 556    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 557    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 558
 559    (void) target_msc;
 560    (void) divisor;
 561    (void) remainder;
 562
 563    if (flush) {
 564       glFlush();
 565    }
 566
 567    (*psc->core->swapBuffers) (pdp->driDrawable);
 568
 569    return 0;
 570 }
 571
 572 static void
 573 driswCopySubBuffer(__GLXDRIdrawable * pdraw,
 574                    int x, int y, int width, int height, Bool flush)
 575 {
 576    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 577    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 578
 579    if (flush) {
 580       glFlush();
 581    }
 582
 583    (*psc->copySubBuffer->copySubBuffer) (pdp->driDrawable,
 584                                             x, y, width, height);
 585 }
 586
 587 static void
 588 driswDestroyScreen(struct glx_screen *base)
 589 {
 590    struct drisw_screen *psc = (struct drisw_screen *) base;
 591
 592    /* Free the direct rendering per screen data */
 593    (*psc->core->destroyScreen) (psc->driScreen);
 594    driDestroyConfigs(psc->driver_configs);
 595    psc->driScreen = NULL;
 596    if (psc->driver)
 597       dlclose(psc->driver);
 598    free(psc);
 599 }
 600
 601 #define SWRAST_DRIVER_NAME "swrast"
 602
 603 static void *
 604 driOpenSwrast(void)
 605 {
 606    void *driver = NULL;
 607
 608    if (driver == NULL)
 609       driver = driOpenDriver(SWRAST_DRIVER_NAME);
 610
 611    return driver;
 612 }
 613
 614 static const struct glx_screen_vtable drisw_screen_vtable = {
 615    .create_context         = drisw_create_context,
 616    .create_context_attribs = drisw_create_context_attribs,
 617    .query_renderer_integer = drisw_query_renderer_integer,
 618    .query_renderer_string  = drisw_query_renderer_string,
 619 };
 620
 621 static void
 622 driswBindExtensions(struct drisw_screen *psc, const __DRIextension **extensions)
 623 {
 624    int i;
 625
 626    __glXEnableDirectExtension(&psc->base, "GLX_SGI_make_current_read");
 627
 628    if (psc->swrast->base.version >= 3) {
 629       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
 630       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context_profile");
 631
 632       /* DRISW version >= 2 implies support for OpenGL ES.
 633        */
 634       __glXEnableDirectExtension(&psc->base,
 635                                  "GLX_EXT_create_context_es_profile");
 636       __glXEnableDirectExtension(&psc->base,
 637                                  "GLX_EXT_create_context_es2_profile");
 638    }
 639
 640    if (psc->copySubBuffer)
 641       __glXEnableDirectExtension(&psc->base, "GLX_MESA_copy_sub_buffer");
 642
 643    /* FIXME: Figure out what other extensions can be ported here from dri2. */
 644    for (i = 0; extensions[i]; i++) {
 645       if ((strcmp(extensions[i]->name, __DRI_TEX_BUFFER) == 0)) {
 646          psc->texBuffer = (__DRItexBufferExtension *) extensions[i];
 647          __glXEnableDirectExtension(&psc->base, "GLX_EXT_texture_from_pixmap");
 648       }
 649       /* DRISW version 3 is also required because GLX_MESA_query_renderer
 650        * requires GLX_ARB_create_context_profile.
 651        */
 652       if (psc->swrast->base.version >= 3
 653           && strcmp(extensions[i]->name, __DRI2_RENDERER_QUERY) == 0) {
 654          psc->rendererQuery = (__DRI2rendererQueryExtension *) extensions[i];
 655          __glXEnableDirectExtension(&psc->base, "GLX_MESA_query_renderer");
 656       }
 657       if (strcmp(extensions[i]->name, __DRI2_FLUSH_CONTROL) == 0) {
 658           __glXEnableDirectExtension(&psc->base,
 659                                      "GLX_ARB_context_flush_control");
 660       }
 661    }
 662 }
 663
 664 static struct glx_screen *
 665 driswCreateScreen(int screen, struct glx_display *priv)
 666 {
 667    __GLXDRIscreen *psp;
 668    const __DRIconfig **driver_configs;
 669    const __DRIextension **extensions;
 670    struct drisw_screen *psc;
 671    struct glx_config *configs = NULL, *visuals = NULL;
 672    int i;
 673
 674    psc = calloc(1, sizeof *psc);
 675    if (psc == NULL)
 676       return NULL;
 677
 678    if (!glx_screen_init(&psc->base, screen, priv)) {
 679       free(psc);
 680       return NULL;
 681    }
 682
 683    psc->driver = driOpenSwrast();
 684    if (psc->driver == NULL)
 685       goto handle_error;
 686
 687    extensions = driGetDriverExtensions(psc->driver, SWRAST_DRIVER_NAME);
 688    if (extensions == NULL)
 689       goto handle_error;
 690
 691    for (i = 0; extensions[i]; i++) {
 692       if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
 693          psc->core = (__DRIcoreExtension *) extensions[i];
 694       if (strcmp(extensions[i]->name, __DRI_SWRAST) == 0)
 695          psc->swrast = (__DRIswrastExtension *) extensions[i];
 696       if (strcmp(extensions[i]->name, __DRI_COPY_SUB_BUFFER) == 0)
 697          psc->copySubBuffer = (__DRIcopySubBufferExtension *) extensions[i];
 698    }
 699
 700    if (psc->core == NULL || psc->swrast == NULL) {
 701       ErrorMessageF("core dri extension not found\n");
 702       goto handle_error;
 703    }
 704
 705    if (psc->swrast->base.version >= 4) {
 706       psc->driScreen =
 707          psc->swrast->createNewScreen2(screen, loader_extensions,
 708                                        extensions,
 709                                        &driver_configs, psc);
 710    } else {
 711       psc->driScreen =
 712          psc->swrast->createNewScreen(screen, loader_extensions,
 713                                       &driver_configs, psc);
 714    }
 715    if (psc->driScreen == NULL) {
 716       ErrorMessageF("failed to create dri screen\n");
 717       goto handle_error;
 718    }
 719
 720    extensions = psc->core->getExtensions(psc->driScreen);
 721    driswBindExtensions(psc, extensions);
 722
 723    configs = driConvertConfigs(psc->core, psc->base.configs, driver_configs);
 724    visuals = driConvertConfigs(psc->core, psc->base.visuals, driver_configs);
 725
 726    if (!configs || !visuals) {
 727        ErrorMessageF("No matching fbConfigs or visuals found\n");
 728        goto handle_error;
 729    }
 730
 731    glx_config_destroy_list(psc->base.configs);
 732    psc->base.configs = configs;
 733    glx_config_destroy_list(psc->base.visuals);
 734    psc->base.visuals = visuals;
 735
 736    psc->driver_configs = driver_configs;
 737
 738    psc->base.vtable = &drisw_screen_vtable;
 739    psp = &psc->vtable;
 740    psc->base.driScreen = psp;
 741    psp->destroyScreen = driswDestroyScreen;
 742    psp->createDrawable = driswCreateDrawable;
 743    psp->swapBuffers = driswSwapBuffers;
 744
 745    if (psc->copySubBuffer)
 746       psp->copySubBuffer = driswCopySubBuffer;
 747
 748    return &psc->base;
 749
 750  handle_error:
 751    if (configs)
 752        glx_config_destroy_list(configs);
 753    if (visuals)
 754        glx_config_destroy_list(visuals);
 755    if (psc->driScreen)
 756        psc->core->destroyScreen(psc->driScreen);
 757    psc->driScreen = NULL;
 758
 759    if (psc->driver)
 760       dlclose(psc->driver);
 761    glx_screen_cleanup(&psc->base);
 762    free(psc);
 763
 764    CriticalErrorMessageF("failed to load driver: %s\n", SWRAST_DRIVER_NAME);
 765
 766    return NULL;
 767 }
 768
 769 /* Called from __glXFreeDisplayPrivate.
 770  */
 771 static void
 772 driswDestroyDisplay(__GLXDRIdisplay * dpy)
 773 {
 774    free(dpy);
 775 }
 776
 777 /*
 778  * Allocate, initialize and return a __DRIdisplayPrivate object.
 779  * This is called from __glXInitialize() when we are given a new
 780  * display pointer.
 781  */
 782 _X_HIDDEN __GLXDRIdisplay *
 783 driswCreateDisplay(Display * dpy)
 784 {
 785    struct drisw_display *pdpyp;
 786
 787    pdpyp = malloc(sizeof *pdpyp);
 788    if (pdpyp == NULL)
 789       return NULL;
 790
 791    pdpyp->base.destroyDisplay = driswDestroyDisplay;
 792    pdpyp->base.createScreen = driswCreateScreen;
 793
 794    return &pdpyp->base;
 795 }
 796
 797 #endif /* GLX_DIRECT_RENDERING */