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 (pdraw == NULL || pread == NULL)
 259       return GLXBadDrawable;
 260
 261    if ((*psc->core->bindContext) (pcp->driContext,
 262                                   pdraw->driDrawable, pread->driDrawable))
 263       return Success;
 264
 265    return GLXBadContext;
 266 }
 267
 268 static void
 269 drisw_unbind_context(struct glx_context *context, struct glx_context *new)
 270 {
 271    struct drisw_context *pcp = (struct drisw_context *) context;
 272    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 273
 274    (*psc->core->unbindContext) (pcp->driContext);
 275 }
 276
 277 static void
 278 drisw_bind_tex_image(Display * dpy,
 279                     GLXDrawable drawable,
 280                     int buffer, const int *attrib_list)
 281 {
 282    struct glx_context *gc = __glXGetCurrentContext();
 283    struct drisw_context *pcp = (struct drisw_context *) gc;
 284    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 285    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 286    struct drisw_screen *psc;
 287
 288    __glXInitialize(dpy);
 289
 290    if (pdraw != NULL) {
 291       psc = (struct drisw_screen *) base->psc;
 292
 293       if (!psc->texBuffer)
 294          return;
 295
 296       if (psc->texBuffer->base.version >= 2 &&
 297         psc->texBuffer->setTexBuffer2 != NULL) {
 298               (*psc->texBuffer->setTexBuffer2) (pcp->driContext,
 299                                            pdraw->base.textureTarget,
 300                                            pdraw->base.textureFormat,
 301                                            pdraw->driDrawable);
 302       }
 303       else {
 304               (*psc->texBuffer->setTexBuffer) (pcp->driContext,
 305                                           pdraw->base.textureTarget,
 306                                           pdraw->driDrawable);
 307       }
 308    }
 309 }
 310
 311 static void
 312 drisw_release_tex_image(Display * dpy, GLXDrawable drawable, int buffer)
 313 {
 314    struct glx_context *gc = __glXGetCurrentContext();
 315    struct drisw_context *pcp = (struct drisw_context *) gc;
 316    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 317    struct glx_display *dpyPriv = __glXInitialize(dpy);
 318    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 319    struct drisw_screen *psc;
 320
 321    if (dpyPriv != NULL && pdraw != NULL) {
 322       psc = (struct drisw_screen *) base->psc;
 323
 324       if (!psc->texBuffer)
 325          return;
 326
 327       if (psc->texBuffer->base.version >= 3 &&
 328           psc->texBuffer->releaseTexBuffer != NULL) {
 329          (*psc->texBuffer->releaseTexBuffer) (pcp->driContext,
 330                                            pdraw->base.textureTarget,
 331                                            pdraw->driDrawable);
 332       }
 333    }
 334 }
 335
 336 static const struct glx_context_vtable drisw_context_vtable = {
 337    .destroy             = drisw_destroy_context,
 338    .bind                = drisw_bind_context,
 339    .unbind              = drisw_unbind_context,
 340    .wait_gl             = NULL,
 341    .wait_x              = NULL,
 342    .use_x_font          = DRI_glXUseXFont,
 343    .bind_tex_image      = drisw_bind_tex_image,
 344    .release_tex_image   = drisw_release_tex_image,
 345    .get_proc_address    = NULL,
 346 };
 347
 348 static struct glx_context *
 349 drisw_create_context(struct glx_screen *base,
 350                      struct glx_config *config_base,
 351                      struct glx_context *shareList, int renderType)
 352 {
 353    struct drisw_context *pcp, *pcp_shared;
 354    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 355    struct drisw_screen *psc = (struct drisw_screen *) base;
 356    __DRIcontext *shared = NULL;
 357
 358    if (!psc->base.driScreen)
 359       return NULL;
 360
 361    /* Check the renderType value */
 362    if (!validate_renderType_against_config(config_base, renderType))
 363        return NULL;
 364
 365    if (shareList) {
 366       /* If the shareList context is not a DRISW context, we cannot possibly
 367        * create a DRISW context that shares it.
 368        */
 369       if (shareList->vtable->destroy != drisw_destroy_context) {
 370          return NULL;
 371       }
 372
 373       pcp_shared = (struct drisw_context *) shareList;
 374       shared = pcp_shared->driContext;
 375    }
 376
 377    pcp = calloc(1, sizeof *pcp);
 378    if (pcp == NULL)
 379       return NULL;
 380
 381    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 382       free(pcp);
 383       return NULL;
 384    }
 385
 386    pcp->base.renderType = renderType;
 387
 388    pcp->driContext =
 389       (*psc->core->createNewContext) (psc->driScreen,
 390                                       config->driConfig, shared, pcp);
 391    if (pcp->driContext == NULL) {
 392       free(pcp);
 393       return NULL;
 394    }
 395
 396    pcp->base.vtable = &drisw_context_vtable;
 397
 398    return &pcp->base;
 399 }
 400
 401 static struct glx_context *
 402 drisw_create_context_attribs(struct glx_screen *base,
 403                              struct glx_config *config_base,
 404                              struct glx_context *shareList,
 405                              unsigned num_attribs,
 406                              const uint32_t *attribs,
 407                              unsigned *error)
 408 {
 409    struct drisw_context *pcp, *pcp_shared;
 410    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 411    struct drisw_screen *psc = (struct drisw_screen *) base;
 412    __DRIcontext *shared = NULL;
 413
 414    uint32_t minor_ver;
 415    uint32_t major_ver;
 416    uint32_t renderType;
 417    uint32_t flags;
 418    unsigned api;
 419    int reset;
 420    int release;
 421    uint32_t ctx_attribs[2 * 5];
 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, &release, 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 (release != __DRI_CTX_RELEASE_BEHAVIOR_FLUSH &&
 446        release != __DRI_CTX_RELEASE_BEHAVIOR_NONE)
 447       return NULL;
 448
 449    if (shareList) {
 450       pcp_shared = (struct drisw_context *) shareList;
 451       shared = pcp_shared->driContext;
 452    }
 453
 454    pcp = calloc(1, sizeof *pcp);
 455    if (pcp == NULL)
 456       return NULL;
 457
 458    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 459       free(pcp);
 460       return NULL;
 461    }
 462
 463    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MAJOR_VERSION;
 464    ctx_attribs[num_ctx_attribs++] = major_ver;
 465    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MINOR_VERSION;
 466    ctx_attribs[num_ctx_attribs++] = minor_ver;
 467    if (release != __DRI_CTX_RELEASE_BEHAVIOR_FLUSH) {
 468        ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_RELEASE_BEHAVIOR;
 469        ctx_attribs[num_ctx_attribs++] = release;
 470    }
 471
 472    if (flags != 0) {
 473       ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_FLAGS;
 474
 475       /* The current __DRI_CTX_FLAG_* values are identical to the
 476        * GLX_CONTEXT_*_BIT values.
 477        */
 478       ctx_attribs[num_ctx_attribs++] = flags;
 479    }
 480
 481    pcp->base.renderType = renderType;
 482
 483    pcp->driContext =
 484       (*psc->swrast->createContextAttribs) (psc->driScreen,
 485                                             api,
 486                                             config->driConfig,
 487                                             shared,
 488                                             num_ctx_attribs / 2,
 489                                             ctx_attribs,
 490                                             error,
 491                                             pcp);
 492    if (pcp->driContext == NULL) {
 493       free(pcp);
 494       return NULL;
 495    }
 496
 497    pcp->base.vtable = &drisw_context_vtable;
 498
 499    return &pcp->base;
 500 }
 501
 502 static void
 503 driswDestroyDrawable(__GLXDRIdrawable * pdraw)
 504 {
 505    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 506    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 507
 508    (*psc->core->destroyDrawable) (pdp->driDrawable);
 509
 510    XDestroyDrawable(pdp, pdraw->psc->dpy, pdraw->drawable);
 511    free(pdp);
 512 }
 513
 514 static __GLXDRIdrawable *
 515 driswCreateDrawable(struct glx_screen *base, XID xDrawable,
 516                     GLXDrawable drawable, struct glx_config *modes)
 517 {
 518    struct drisw_drawable *pdp;
 519    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) modes;
 520    struct drisw_screen *psc = (struct drisw_screen *) base;
 521    Bool ret;
 522    const __DRIswrastExtension *swrast = psc->swrast;
 523
 524    pdp = calloc(1, sizeof(*pdp));
 525    if (!pdp)
 526       return NULL;
 527
 528    pdp->base.xDrawable = xDrawable;
 529    pdp->base.drawable = drawable;
 530    pdp->base.psc = &psc->base;
 531
 532    ret = XCreateDrawable(pdp, psc->base.dpy, xDrawable, modes->visualID);
 533    if (!ret) {
 534       free(pdp);
 535       return NULL;
 536    }
 537
 538    /* Create a new drawable */
 539    pdp->driDrawable =
 540       (*swrast->createNewDrawable) (psc->driScreen, config->driConfig, pdp);
 541
 542    if (!pdp->driDrawable) {
 543       XDestroyDrawable(pdp, psc->base.dpy, xDrawable);
 544       free(pdp);
 545       return NULL;
 546    }
 547
 548    pdp->base.destroyDrawable = driswDestroyDrawable;
 549
 550    return &pdp->base;
 551 }
 552
 553 static int64_t
 554 driswSwapBuffers(__GLXDRIdrawable * pdraw,
 555                  int64_t target_msc, int64_t divisor, int64_t remainder,
 556                  Bool flush)
 557 {
 558    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 559    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 560
 561    (void) target_msc;
 562    (void) divisor;
 563    (void) remainder;
 564
 565    if (flush) {
 566       glFlush();
 567    }
 568
 569    (*psc->core->swapBuffers) (pdp->driDrawable);
 570
 571    return 0;
 572 }
 573
 574 static void
 575 driswCopySubBuffer(__GLXDRIdrawable * pdraw,
 576                    int x, int y, int width, int height, Bool flush)
 577 {
 578    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 579    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 580
 581    if (flush) {
 582       glFlush();
 583    }
 584
 585    (*psc->copySubBuffer->copySubBuffer) (pdp->driDrawable,
 586                                             x, y, width, height);
 587 }
 588
 589 static void
 590 driswDestroyScreen(struct glx_screen *base)
 591 {
 592    struct drisw_screen *psc = (struct drisw_screen *) base;
 593
 594    /* Free the direct rendering per screen data */
 595    (*psc->core->destroyScreen) (psc->driScreen);
 596    driDestroyConfigs(psc->driver_configs);
 597    psc->driScreen = NULL;
 598    if (psc->driver)
 599       dlclose(psc->driver);
 600    free(psc);
 601 }
 602
 603 #define SWRAST_DRIVER_NAME "swrast"
 604
 605 static void *
 606 driOpenSwrast(void)
 607 {
 608    void *driver = NULL;
 609
 610    if (driver == NULL)
 611       driver = driOpenDriver(SWRAST_DRIVER_NAME);
 612
 613    return driver;
 614 }
 615
 616 static const struct glx_screen_vtable drisw_screen_vtable = {
 617    .create_context         = drisw_create_context,
 618    .create_context_attribs = drisw_create_context_attribs,
 619    .query_renderer_integer = drisw_query_renderer_integer,
 620    .query_renderer_string  = drisw_query_renderer_string,
 621 };
 622
 623 static void
 624 driswBindExtensions(struct drisw_screen *psc, const __DRIextension **extensions)
 625 {
 626    int i;
 627
 628    __glXEnableDirectExtension(&psc->base, "GLX_SGI_make_current_read");
 629
 630    if (psc->swrast->base.version >= 3) {
 631       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
 632       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context_profile");
 633
 634       /* DRISW version >= 2 implies support for OpenGL ES.
 635        */
 636       __glXEnableDirectExtension(&psc->base,
 637                                  "GLX_EXT_create_context_es_profile");
 638       __glXEnableDirectExtension(&psc->base,
 639                                  "GLX_EXT_create_context_es2_profile");
 640    }
 641
 642    if (psc->copySubBuffer)
 643       __glXEnableDirectExtension(&psc->base, "GLX_MESA_copy_sub_buffer");
 644
 645    /* FIXME: Figure out what other extensions can be ported here from dri2. */
 646    for (i = 0; extensions[i]; i++) {
 647       if ((strcmp(extensions[i]->name, __DRI_TEX_BUFFER) == 0)) {
 648          psc->texBuffer = (__DRItexBufferExtension *) extensions[i];
 649          __glXEnableDirectExtension(&psc->base, "GLX_EXT_texture_from_pixmap");
 650       }
 651       /* DRISW version 3 is also required because GLX_MESA_query_renderer
 652        * requires GLX_ARB_create_context_profile.
 653        */
 654       if (psc->swrast->base.version >= 3
 655           && strcmp(extensions[i]->name, __DRI2_RENDERER_QUERY) == 0) {
 656          psc->rendererQuery = (__DRI2rendererQueryExtension *) extensions[i];
 657          __glXEnableDirectExtension(&psc->base, "GLX_MESA_query_renderer");
 658       }
 659       if (strcmp(extensions[i]->name, __DRI2_FLUSH_CONTROL) == 0) {
 660           __glXEnableDirectExtension(&psc->base,
 661                                      "GLX_ARB_context_flush_control");
 662       }
 663    }
 664 }
 665
 666 static struct glx_screen *
 667 driswCreateScreen(int screen, struct glx_display *priv)
 668 {
 669    __GLXDRIscreen *psp;
 670    const __DRIconfig **driver_configs;
 671    const __DRIextension **extensions;
 672    struct drisw_screen *psc;
 673    struct glx_config *configs = NULL, *visuals = NULL;
 674    int i;
 675
 676    psc = calloc(1, sizeof *psc);
 677    if (psc == NULL)
 678       return NULL;
 679
 680    if (!glx_screen_init(&psc->base, screen, priv)) {
 681       free(psc);
 682       return NULL;
 683    }
 684
 685    psc->driver = driOpenSwrast();
 686    if (psc->driver == NULL)
 687       goto handle_error;
 688
 689    extensions = driGetDriverExtensions(psc->driver, SWRAST_DRIVER_NAME);
 690    if (extensions == NULL)
 691       goto handle_error;
 692
 693    for (i = 0; extensions[i]; i++) {
 694       if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
 695          psc->core = (__DRIcoreExtension *) extensions[i];
 696       if (strcmp(extensions[i]->name, __DRI_SWRAST) == 0)
 697          psc->swrast = (__DRIswrastExtension *) extensions[i];
 698       if (strcmp(extensions[i]->name, __DRI_COPY_SUB_BUFFER) == 0)
 699          psc->copySubBuffer = (__DRIcopySubBufferExtension *) extensions[i];
 700    }
 701
 702    if (psc->core == NULL || psc->swrast == NULL) {
 703       ErrorMessageF("core dri extension not found\n");
 704       goto handle_error;
 705    }
 706
 707    if (psc->swrast->base.version >= 4) {
 708       psc->driScreen =
 709          psc->swrast->createNewScreen2(screen, loader_extensions,
 710                                        extensions,
 711                                        &driver_configs, psc);
 712    } else {
 713       psc->driScreen =
 714          psc->swrast->createNewScreen(screen, loader_extensions,
 715                                       &driver_configs, psc);
 716    }
 717    if (psc->driScreen == NULL) {
 718       ErrorMessageF("failed to create dri screen\n");
 719       goto handle_error;
 720    }
 721
 722    extensions = psc->core->getExtensions(psc->driScreen);
 723    driswBindExtensions(psc, extensions);
 724
 725    configs = driConvertConfigs(psc->core, psc->base.configs, driver_configs);
 726    visuals = driConvertConfigs(psc->core, psc->base.visuals, driver_configs);
 727
 728    if (!configs || !visuals) {
 729        ErrorMessageF("No matching fbConfigs or visuals found\n");
 730        goto handle_error;
 731    }
 732
 733    glx_config_destroy_list(psc->base.configs);
 734    psc->base.configs = configs;
 735    glx_config_destroy_list(psc->base.visuals);
 736    psc->base.visuals = visuals;
 737
 738    psc->driver_configs = driver_configs;
 739
 740    psc->base.vtable = &drisw_screen_vtable;
 741    psp = &psc->vtable;
 742    psc->base.driScreen = psp;
 743    psp->destroyScreen = driswDestroyScreen;
 744    psp->createDrawable = driswCreateDrawable;
 745    psp->swapBuffers = driswSwapBuffers;
 746
 747    if (psc->copySubBuffer)
 748       psp->copySubBuffer = driswCopySubBuffer;
 749
 750    return &psc->base;
 751
 752  handle_error:
 753    if (configs)
 754        glx_config_destroy_list(configs);
 755    if (visuals)
 756        glx_config_destroy_list(visuals);
 757    if (psc->driScreen)
 758        psc->core->destroyScreen(psc->driScreen);
 759    psc->driScreen = NULL;
 760
 761    if (psc->driver)
 762       dlclose(psc->driver);
 763    glx_screen_cleanup(&psc->base);
 764    free(psc);
 765
 766    CriticalErrorMessageF("failed to load driver: %s\n", SWRAST_DRIVER_NAME);
 767
 768    return NULL;
 769 }
 770
 771 /* Called from __glXFreeDisplayPrivate.
 772  */
 773 static void
 774 driswDestroyDisplay(__GLXDRIdisplay * dpy)
 775 {
 776    free(dpy);
 777 }
 778
 779 /*
 780  * Allocate, initialize and return a __DRIdisplayPrivate object.
 781  * This is called from __glXInitialize() when we are given a new
 782  * display pointer.
 783  */
 784 _X_HIDDEN __GLXDRIdisplay *
 785 driswCreateDisplay(Display * dpy)
 786 {
 787    struct drisw_display *pdpyp;
 788
 789    pdpyp = malloc(sizeof *pdpyp);
 790    if (pdpyp == NULL)
 791       return NULL;
 792
 793    pdpyp->base.destroyDisplay = driswDestroyDisplay;
 794    pdpyp->base.createScreen = driswCreateScreen;
 795
 796    return &pdpyp->base;
 797 }
 798
 799 #endif /* GLX_DIRECT_RENDERING */