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 #include <X11/extensions/shmproto.h>
  32 #include <assert.h>
  33
  34 static Bool
  35 XCreateGCs(struct drisw_drawable * pdp,
  36            Display * dpy, XID drawable, int visualid)
  37 {
  38    XGCValues gcvalues;
  39    long visMask;
  40    XVisualInfo visTemp;
  41    int num_visuals;
  42
  43    /* create GC's */
  44    pdp->gc = XCreateGC(dpy, drawable, 0, NULL);
  45    pdp->swapgc = XCreateGC(dpy, drawable, 0, NULL);
  46
  47    gcvalues.function = GXcopy;
  48    gcvalues.graphics_exposures = False;
  49    XChangeGC(dpy, pdp->gc, GCFunction, &gcvalues);
  50    XChangeGC(dpy, pdp->swapgc, GCFunction, &gcvalues);
  51    XChangeGC(dpy, pdp->swapgc, GCGraphicsExposures, &gcvalues);
  52
  53    /* visual */
  54    visTemp.visualid = visualid;
  55    visMask = VisualIDMask;
  56    pdp->visinfo = XGetVisualInfo(dpy, visMask, &visTemp, &num_visuals);
  57
  58    if (!pdp->visinfo || num_visuals == 0)
  59       return False;
  60
  61    return True;
  62 }
  63
  64 static int xshm_error = 0;
  65 static int xshm_opcode = -1;
  66
  67 /**
  68  * Catches potential Xlib errors.
  69  */
  70 static int
  71 handle_xerror(Display *dpy, XErrorEvent *event)
  72 {
  73    (void) dpy;
  74
  75    assert(xshm_opcode != -1);
  76    if (event->request_code != xshm_opcode ||
  77        event->minor_code != X_ShmAttach)
  78       return 0;
  79
  80    xshm_error = 1;
  81    return 0;
  82 }
  83
  84 static Bool
  85 XCreateDrawable(struct drisw_drawable * pdp, int shmid, Display * dpy)
  86 {
  87    if (pdp->ximage) {
  88       XDestroyImage(pdp->ximage);
  89       pdp->ximage = NULL;
  90    }
  91
  92    if (!xshm_error && shmid >= 0) {
  93       pdp->shminfo.shmid = shmid;
  94       pdp->ximage = XShmCreateImage(dpy,
  95                                     pdp->visinfo->visual,
  96                                     pdp->visinfo->depth,
  97                                     ZPixmap,              /* format */
  98                                     NULL,                 /* data */
  99                                     &pdp->shminfo,        /* shminfo */
 100                                     0, 0);                /* width, height */
 101       if (pdp->ximage != NULL) {
 102          int (*old_handler)(Display *, XErrorEvent *);
 103
 104          /* dispatch pending errors */
 105          XSync(dpy, False);
 106
 107          old_handler = XSetErrorHandler(handle_xerror);
 108          /* This may trigger the X protocol error we're ready to catch: */
 109          XShmAttach(dpy, &pdp->shminfo);
 110          XSync(dpy, False);
 111
 112          if (xshm_error) {
 113          /* we are on a remote display, this error is normal, don't print it */
 114             XDestroyImage(pdp->ximage);
 115             pdp->ximage = NULL;
 116          }
 117
 118          (void) XSetErrorHandler(old_handler);
 119       }
 120    }
 121
 122    if (pdp->ximage == NULL) {
 123       pdp->shminfo.shmid = -1;
 124       pdp->ximage = XCreateImage(dpy,
 125                                  pdp->visinfo->visual,
 126                                  pdp->visinfo->depth,
 127                                  ZPixmap, 0,             /* format, offset */
 128                                  NULL,                   /* data */
 129                                  0, 0,                   /* width, height */
 130                                  32,                     /* bitmap_pad */
 131                                  0);                     /* bytes_per_line */
 132    }
 133
 134   /**
 135    * swrast does not handle 24-bit depth with 24 bpp, so let X do the
 136    * the conversion for us.
 137    */
 138   if (pdp->ximage->bits_per_pixel == 24)
 139      pdp->ximage->bits_per_pixel = 32;
 140
 141    return True;
 142 }
 143
 144 static void
 145 XDestroyDrawable(struct drisw_drawable * pdp, Display * dpy, XID drawable)
 146 {
 147    if (pdp->ximage)
 148       XDestroyImage(pdp->ximage);
 149
 150    free(pdp->visinfo);
 151
 152    XFreeGC(dpy, pdp->gc);
 153    XFreeGC(dpy, pdp->swapgc);
 154 }
 155
 156 /**
 157  * swrast loader functions
 158  */
 159
 160 static void
 161 swrastGetDrawableInfo(__DRIdrawable * draw,
 162                       int *x, int *y, int *w, int *h,
 163                       void *loaderPrivate)
 164 {
 165    struct drisw_drawable *pdp = loaderPrivate;
 166    __GLXDRIdrawable *pdraw = &(pdp->base);
 167    Display *dpy = pdraw->psc->dpy;
 168    Drawable drawable;
 169
 170    Window root;
 171    unsigned uw, uh, bw, depth;
 172
 173    drawable = pdraw->xDrawable;
 174
 175    XGetGeometry(dpy, drawable, &root, x, y, &uw, &uh, &bw, &depth);
 176    *w = uw;
 177    *h = uh;
 178 }
 179
 180 /**
 181  * Align renderbuffer pitch.
 182  *
 183  * This should be chosen by the driver and the loader (libGL, xserver/glx)
 184  * should use the driver provided pitch.
 185  *
 186  * It seems that the xorg loader (that is the xserver loading swrast_dri for
 187  * indirect rendering, not client-side libGL) requires that the pitch is
 188  * exactly the image width padded to 32 bits. XXX
 189  *
 190  * The above restriction can probably be overcome by using ScratchPixmap and
 191  * CopyArea in the xserver, similar to ShmPutImage, and setting the width of
 192  * the scratch pixmap to 'pitch / cpp'.
 193  */
 194 static inline int
 195 bytes_per_line(unsigned pitch_bits, unsigned mul)
 196 {
 197    unsigned mask = mul - 1;
 198
 199    return ((pitch_bits + mask) & ~mask) / 8;
 200 }
 201
 202 static void
 203 swrastXPutImage(__DRIdrawable * draw, int op,
 204                 int x, int y, int w, int h, int stride,
 205                 int shmid, char *data, void *loaderPrivate)
 206 {
 207    struct drisw_drawable *pdp = loaderPrivate;
 208    __GLXDRIdrawable *pdraw = &(pdp->base);
 209    Display *dpy = pdraw->psc->dpy;
 210    Drawable drawable;
 211    XImage *ximage;
 212    GC gc;
 213
 214    if (!pdp->ximage || shmid != pdp->shminfo.shmid) {
 215       if (!XCreateDrawable(pdp, shmid, dpy))
 216          return;
 217    }
 218
 219    switch (op) {
 220    case __DRI_SWRAST_IMAGE_OP_DRAW:
 221       gc = pdp->gc;
 222       break;
 223    case __DRI_SWRAST_IMAGE_OP_SWAP:
 224       gc = pdp->swapgc;
 225       break;
 226    default:
 227       return;
 228    }
 229
 230    drawable = pdraw->xDrawable;
 231    ximage = pdp->ximage;
 232    ximage->bytes_per_line = stride ? stride : bytes_per_line(w * ximage->bits_per_pixel, 32);
 233    ximage->data = data;
 234
 235    if (pdp->shminfo.shmid >= 0) {
 236       ximage->width = ximage->bytes_per_line / ((ximage->bits_per_pixel + 7)/ 8);
 237       ximage->height = h;
 238       XShmPutImage(dpy, drawable, gc, ximage, 0, 0, x, y, w, h, False);
 239       XSync(dpy, False);
 240    } else {
 241       ximage->width = w;
 242       ximage->height = h;
 243       XPutImage(dpy, drawable, gc, ximage, 0, 0, x, y, w, h);
 244    }
 245    ximage->data = NULL;
 246 }
 247
 248 static void
 249 swrastPutImageShm(__DRIdrawable * draw, int op,
 250                   int x, int y, int w, int h, int stride,
 251                   int shmid, char *shmaddr, unsigned offset,
 252                   void *loaderPrivate)
 253 {
 254    struct drisw_drawable *pdp = loaderPrivate;
 255
 256    pdp->shminfo.shmaddr = shmaddr;
 257    swrastXPutImage(draw, op, x, y, w, h, stride, shmid,
 258                    shmaddr + offset, loaderPrivate);
 259 }
 260
 261 static void
 262 swrastPutImage2(__DRIdrawable * draw, int op,
 263                 int x, int y, int w, int h, int stride,
 264                 char *data, void *loaderPrivate)
 265 {
 266    swrastXPutImage(draw, op, x, y, w, h, stride, -1,
 267                    data, loaderPrivate);
 268 }
 269
 270 static void
 271 swrastPutImage(__DRIdrawable * draw, int op,
 272                int x, int y, int w, int h,
 273                char *data, void *loaderPrivate)
 274 {
 275    swrastXPutImage(draw, op, x, y, w, h, 0, -1,
 276                    data, loaderPrivate);
 277 }
 278
 279 static void
 280 swrastGetImage2(__DRIdrawable * read,
 281                 int x, int y, int w, int h, int stride,
 282                 char *data, void *loaderPrivate)
 283 {
 284    struct drisw_drawable *prp = loaderPrivate;
 285    __GLXDRIdrawable *pread = &(prp->base);
 286    Display *dpy = pread->psc->dpy;
 287    Drawable readable;
 288    XImage *ximage;
 289
 290    if (!prp->ximage || prp->shminfo.shmid >= 0) {
 291       if (!XCreateDrawable(prp, -1, dpy))
 292          return;
 293    }
 294
 295    readable = pread->xDrawable;
 296
 297    ximage = prp->ximage;
 298    ximage->data = data;
 299    ximage->width = w;
 300    ximage->height = h;
 301    ximage->bytes_per_line = stride ? stride : bytes_per_line(w * ximage->bits_per_pixel, 32);
 302
 303    XGetSubImage(dpy, readable, x, y, w, h, ~0L, ZPixmap, ximage, 0, 0);
 304
 305    ximage->data = NULL;
 306 }
 307
 308 static void
 309 swrastGetImage(__DRIdrawable * read,
 310                int x, int y, int w, int h,
 311                char *data, void *loaderPrivate)
 312 {
 313    swrastGetImage2(read, x, y, w, h, 0, data, loaderPrivate);
 314 }
 315
 316 static __DRIswrastLoaderExtension swrastLoaderExtension = {
 317    .base = {__DRI_SWRAST_LOADER, 4 },
 318
 319    .getDrawableInfo     = swrastGetDrawableInfo,
 320    .putImage            = swrastPutImage,
 321    .getImage            = swrastGetImage,
 322    .putImage2           = swrastPutImage2,
 323    .getImage2           = swrastGetImage2,
 324    .putImageShm         = swrastPutImageShm,
 325 };
 326
 327 static const __DRIextension *loader_extensions[] = {
 328    &swrastLoaderExtension.base,
 329    NULL
 330 };
 331
 332 /**
 333  * GLXDRI functions
 334  */
 335
 336 static void
 337 drisw_destroy_context(struct glx_context *context)
 338 {
 339    struct drisw_context *pcp = (struct drisw_context *) context;
 340    struct drisw_screen *psc = (struct drisw_screen *) context->psc;
 341
 342    driReleaseDrawables(&pcp->base);
 343
 344    free((char *) context->extensions);
 345
 346    (*psc->core->destroyContext) (pcp->driContext);
 347
 348    free(pcp);
 349 }
 350
 351 static int
 352 drisw_bind_context(struct glx_context *context, struct glx_context *old,
 353                    GLXDrawable draw, GLXDrawable read)
 354 {
 355    struct drisw_context *pcp = (struct drisw_context *) context;
 356    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 357    struct drisw_drawable *pdraw, *pread;
 358
 359    pdraw = (struct drisw_drawable *) driFetchDrawable(context, draw);
 360    pread = (struct drisw_drawable *) driFetchDrawable(context, read);
 361
 362    driReleaseDrawables(&pcp->base);
 363
 364    if ((*psc->core->bindContext) (pcp->driContext,
 365                                   pdraw ? pdraw->driDrawable : NULL,
 366                                   pread ? pread->driDrawable : NULL))
 367       return Success;
 368
 369    return GLXBadContext;
 370 }
 371
 372 static void
 373 drisw_unbind_context(struct glx_context *context, struct glx_context *new)
 374 {
 375    struct drisw_context *pcp = (struct drisw_context *) context;
 376    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 377
 378    (*psc->core->unbindContext) (pcp->driContext);
 379 }
 380
 381 static void
 382 drisw_bind_tex_image(Display * dpy,
 383                     GLXDrawable drawable,
 384                     int buffer, const int *attrib_list)
 385 {
 386    struct glx_context *gc = __glXGetCurrentContext();
 387    struct drisw_context *pcp = (struct drisw_context *) gc;
 388    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 389    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 390    struct drisw_screen *psc;
 391
 392    __glXInitialize(dpy);
 393
 394    if (pdraw != NULL) {
 395       psc = (struct drisw_screen *) base->psc;
 396
 397       if (!psc->texBuffer)
 398          return;
 399
 400       if (psc->texBuffer->base.version >= 2 &&
 401         psc->texBuffer->setTexBuffer2 != NULL) {
 402               (*psc->texBuffer->setTexBuffer2) (pcp->driContext,
 403                                            pdraw->base.textureTarget,
 404                                            pdraw->base.textureFormat,
 405                                            pdraw->driDrawable);
 406       }
 407       else {
 408               (*psc->texBuffer->setTexBuffer) (pcp->driContext,
 409                                           pdraw->base.textureTarget,
 410                                           pdraw->driDrawable);
 411       }
 412    }
 413 }
 414
 415 static void
 416 drisw_release_tex_image(Display * dpy, GLXDrawable drawable, int buffer)
 417 {
 418    struct glx_context *gc = __glXGetCurrentContext();
 419    struct drisw_context *pcp = (struct drisw_context *) gc;
 420    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 421    struct glx_display *dpyPriv = __glXInitialize(dpy);
 422    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 423    struct drisw_screen *psc;
 424
 425    if (dpyPriv != NULL && pdraw != NULL) {
 426       psc = (struct drisw_screen *) base->psc;
 427
 428       if (!psc->texBuffer)
 429          return;
 430
 431       if (psc->texBuffer->base.version >= 3 &&
 432           psc->texBuffer->releaseTexBuffer != NULL) {
 433          (*psc->texBuffer->releaseTexBuffer) (pcp->driContext,
 434                                            pdraw->base.textureTarget,
 435                                            pdraw->driDrawable);
 436       }
 437    }
 438 }
 439
 440 static const struct glx_context_vtable drisw_context_vtable = {
 441    .destroy             = drisw_destroy_context,
 442    .bind                = drisw_bind_context,
 443    .unbind              = drisw_unbind_context,
 444    .wait_gl             = NULL,
 445    .wait_x              = NULL,
 446    .use_x_font          = DRI_glXUseXFont,
 447    .bind_tex_image      = drisw_bind_tex_image,
 448    .release_tex_image   = drisw_release_tex_image,
 449    .get_proc_address    = NULL,
 450 };
 451
 452 static struct glx_context *
 453 drisw_create_context(struct glx_screen *base,
 454                      struct glx_config *config_base,
 455                      struct glx_context *shareList, int renderType)
 456 {
 457    struct drisw_context *pcp, *pcp_shared;
 458    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 459    struct drisw_screen *psc = (struct drisw_screen *) base;
 460    __DRIcontext *shared = NULL;
 461
 462    if (!psc->base.driScreen)
 463       return NULL;
 464
 465    /* Check the renderType value */
 466    if (!validate_renderType_against_config(config_base, renderType))
 467        return NULL;
 468
 469    if (shareList) {
 470       /* If the shareList context is not a DRISW context, we cannot possibly
 471        * create a DRISW context that shares it.
 472        */
 473       if (shareList->vtable->destroy != drisw_destroy_context) {
 474          return NULL;
 475       }
 476
 477       pcp_shared = (struct drisw_context *) shareList;
 478       shared = pcp_shared->driContext;
 479    }
 480
 481    pcp = calloc(1, sizeof *pcp);
 482    if (pcp == NULL)
 483       return NULL;
 484
 485    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 486       free(pcp);
 487       return NULL;
 488    }
 489
 490    pcp->base.renderType = renderType;
 491
 492    pcp->driContext =
 493       (*psc->core->createNewContext) (psc->driScreen,
 494                                       config->driConfig, shared, pcp);
 495    if (pcp->driContext == NULL) {
 496       free(pcp);
 497       return NULL;
 498    }
 499
 500    pcp->base.vtable = &drisw_context_vtable;
 501
 502    return &pcp->base;
 503 }
 504
 505 static struct glx_context *
 506 drisw_create_context_attribs(struct glx_screen *base,
 507                              struct glx_config *config_base,
 508                              struct glx_context *shareList,
 509                              unsigned num_attribs,
 510                              const uint32_t *attribs,
 511                              unsigned *error)
 512 {
 513    struct drisw_context *pcp, *pcp_shared;
 514    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 515    struct drisw_screen *psc = (struct drisw_screen *) base;
 516    __DRIcontext *shared = NULL;
 517
 518    uint32_t minor_ver;
 519    uint32_t major_ver;
 520    uint32_t renderType;
 521    uint32_t flags;
 522    unsigned api;
 523    int reset;
 524    int release;
 525    uint32_t ctx_attribs[2 * 5];
 526    unsigned num_ctx_attribs = 0;
 527
 528    if (!psc->base.driScreen)
 529       return NULL;
 530
 531    if (psc->swrast->base.version < 3)
 532       return NULL;
 533
 534    /* Remap the GLX tokens to DRI2 tokens.
 535     */
 536    if (!dri2_convert_glx_attribs(num_attribs, attribs,
 537                                  &major_ver, &minor_ver, &renderType, &flags,
 538                                  &api, &reset, &release, error))
 539       return NULL;
 540
 541    /* Check the renderType value */
 542    if (!validate_renderType_against_config(config_base, renderType)) {
 543        return NULL;
 544    }
 545
 546    if (reset != __DRI_CTX_RESET_NO_NOTIFICATION)
 547       return NULL;
 548
 549    if (release != __DRI_CTX_RELEASE_BEHAVIOR_FLUSH &&
 550        release != __DRI_CTX_RELEASE_BEHAVIOR_NONE)
 551       return NULL;
 552
 553    if (shareList) {
 554       pcp_shared = (struct drisw_context *) shareList;
 555       shared = pcp_shared->driContext;
 556    }
 557
 558    pcp = calloc(1, sizeof *pcp);
 559    if (pcp == NULL)
 560       return NULL;
 561
 562    if (!glx_context_init(&pcp->base, &psc->base, config_base)) {
 563       free(pcp);
 564       return NULL;
 565    }
 566
 567    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MAJOR_VERSION;
 568    ctx_attribs[num_ctx_attribs++] = major_ver;
 569    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MINOR_VERSION;
 570    ctx_attribs[num_ctx_attribs++] = minor_ver;
 571    if (release != __DRI_CTX_RELEASE_BEHAVIOR_FLUSH) {
 572        ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_RELEASE_BEHAVIOR;
 573        ctx_attribs[num_ctx_attribs++] = release;
 574    }
 575
 576    if (flags != 0) {
 577       ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_FLAGS;
 578
 579       /* The current __DRI_CTX_FLAG_* values are identical to the
 580        * GLX_CONTEXT_*_BIT values.
 581        */
 582       ctx_attribs[num_ctx_attribs++] = flags;
 583    }
 584
 585    pcp->base.renderType = renderType;
 586
 587    pcp->driContext =
 588       (*psc->swrast->createContextAttribs) (psc->driScreen,
 589                                             api,
 590                                             config ? config->driConfig : 0,
 591                                             shared,
 592                                             num_ctx_attribs / 2,
 593                                             ctx_attribs,
 594                                             error,
 595                                             pcp);
 596    if (pcp->driContext == NULL) {
 597       free(pcp);
 598       return NULL;
 599    }
 600
 601    pcp->base.vtable = &drisw_context_vtable;
 602
 603    return &pcp->base;
 604 }
 605
 606 static void
 607 driswDestroyDrawable(__GLXDRIdrawable * pdraw)
 608 {
 609    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 610    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 611
 612    (*psc->core->destroyDrawable) (pdp->driDrawable);
 613
 614    XDestroyDrawable(pdp, pdraw->psc->dpy, pdraw->drawable);
 615    free(pdp);
 616 }
 617
 618 static __GLXDRIdrawable *
 619 driswCreateDrawable(struct glx_screen *base, XID xDrawable,
 620                     GLXDrawable drawable, struct glx_config *modes)
 621 {
 622    struct drisw_drawable *pdp;
 623    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) modes;
 624    struct drisw_screen *psc = (struct drisw_screen *) base;
 625    Bool ret;
 626    const __DRIswrastExtension *swrast = psc->swrast;
 627
 628    pdp = calloc(1, sizeof(*pdp));
 629    if (!pdp)
 630       return NULL;
 631
 632    pdp->base.xDrawable = xDrawable;
 633    pdp->base.drawable = drawable;
 634    pdp->base.psc = &psc->base;
 635
 636    ret = XCreateGCs(pdp, psc->base.dpy, xDrawable, modes->visualID);
 637    if (!ret) {
 638       free(pdp);
 639       return NULL;
 640    }
 641
 642    /* Create a new drawable */
 643    pdp->driDrawable =
 644       (*swrast->createNewDrawable) (psc->driScreen, config->driConfig, pdp);
 645
 646    if (!pdp->driDrawable) {
 647       XDestroyDrawable(pdp, psc->base.dpy, xDrawable);
 648       free(pdp);
 649       return NULL;
 650    }
 651
 652    pdp->base.destroyDrawable = driswDestroyDrawable;
 653
 654    return &pdp->base;
 655 }
 656
 657 static int64_t
 658 driswSwapBuffers(__GLXDRIdrawable * pdraw,
 659                  int64_t target_msc, int64_t divisor, int64_t remainder,
 660                  Bool flush)
 661 {
 662    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 663    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 664
 665    (void) target_msc;
 666    (void) divisor;
 667    (void) remainder;
 668
 669    if (flush) {
 670       glFlush();
 671    }
 672
 673    (*psc->core->swapBuffers) (pdp->driDrawable);
 674
 675    return 0;
 676 }
 677
 678 static void
 679 driswCopySubBuffer(__GLXDRIdrawable * pdraw,
 680                    int x, int y, int width, int height, Bool flush)
 681 {
 682    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 683    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 684
 685    if (flush) {
 686       glFlush();
 687    }
 688
 689    (*psc->copySubBuffer->copySubBuffer) (pdp->driDrawable,
 690                                             x, y, width, height);
 691 }
 692
 693 static void
 694 driswDestroyScreen(struct glx_screen *base)
 695 {
 696    struct drisw_screen *psc = (struct drisw_screen *) base;
 697
 698    /* Free the direct rendering per screen data */
 699    (*psc->core->destroyScreen) (psc->driScreen);
 700    driDestroyConfigs(psc->driver_configs);
 701    psc->driScreen = NULL;
 702    if (psc->driver)
 703       dlclose(psc->driver);
 704    free(psc);
 705 }
 706
 707 #define SWRAST_DRIVER_NAME "swrast"
 708
 709 static void *
 710 driOpenSwrast(void)
 711 {
 712    void *driver = NULL;
 713
 714    if (driver == NULL)
 715       driver = driOpenDriver(SWRAST_DRIVER_NAME);
 716
 717    return driver;
 718 }
 719
 720 static const struct glx_screen_vtable drisw_screen_vtable = {
 721    .create_context         = drisw_create_context,
 722    .create_context_attribs = drisw_create_context_attribs,
 723    .query_renderer_integer = drisw_query_renderer_integer,
 724    .query_renderer_string  = drisw_query_renderer_string,
 725 };
 726
 727 static void
 728 driswBindExtensions(struct drisw_screen *psc, const __DRIextension **extensions)
 729 {
 730    int i;
 731
 732    __glXEnableDirectExtension(&psc->base, "GLX_SGI_make_current_read");
 733
 734    if (psc->swrast->base.version >= 3) {
 735       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
 736       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context_profile");
 737
 738       /* DRISW version >= 2 implies support for OpenGL ES.
 739        */
 740       __glXEnableDirectExtension(&psc->base,
 741                                  "GLX_EXT_create_context_es_profile");
 742       __glXEnableDirectExtension(&psc->base,
 743                                  "GLX_EXT_create_context_es2_profile");
 744    }
 745
 746    if (psc->copySubBuffer)
 747       __glXEnableDirectExtension(&psc->base, "GLX_MESA_copy_sub_buffer");
 748
 749    /* FIXME: Figure out what other extensions can be ported here from dri2. */
 750    for (i = 0; extensions[i]; i++) {
 751       if ((strcmp(extensions[i]->name, __DRI_TEX_BUFFER) == 0)) {
 752          psc->texBuffer = (__DRItexBufferExtension *) extensions[i];
 753          __glXEnableDirectExtension(&psc->base, "GLX_EXT_texture_from_pixmap");
 754       }
 755       /* DRISW version 3 is also required because GLX_MESA_query_renderer
 756        * requires GLX_ARB_create_context_profile.
 757        */
 758       if (psc->swrast->base.version >= 3
 759           && strcmp(extensions[i]->name, __DRI2_RENDERER_QUERY) == 0) {
 760          psc->rendererQuery = (__DRI2rendererQueryExtension *) extensions[i];
 761          __glXEnableDirectExtension(&psc->base, "GLX_MESA_query_renderer");
 762       }
 763       if (strcmp(extensions[i]->name, __DRI2_FLUSH_CONTROL) == 0) {
 764           __glXEnableDirectExtension(&psc->base,
 765                                      "GLX_ARB_context_flush_control");
 766       }
 767    }
 768 }
 769
 770 static int
 771 check_xshm(Display *dpy)
 772 {
 773    int ignore;
 774
 775    return XQueryExtension(dpy, "MIT-SHM", &xshm_opcode, &ignore, &ignore);
 776 }
 777
 778 static struct glx_screen *
 779 driswCreateScreen(int screen, struct glx_display *priv)
 780 {
 781    __GLXDRIscreen *psp;
 782    const __DRIconfig **driver_configs;
 783    const __DRIextension **extensions;
 784    struct drisw_screen *psc;
 785    struct glx_config *configs = NULL, *visuals = NULL;
 786    int i;
 787
 788    psc = calloc(1, sizeof *psc);
 789    if (psc == NULL)
 790       return NULL;
 791
 792    if (!glx_screen_init(&psc->base, screen, priv)) {
 793       free(psc);
 794       return NULL;
 795    }
 796
 797    psc->driver = driOpenSwrast();
 798    if (psc->driver == NULL)
 799       goto handle_error;
 800
 801    extensions = driGetDriverExtensions(psc->driver, SWRAST_DRIVER_NAME);
 802    if (extensions == NULL)
 803       goto handle_error;
 804
 805    if (!check_xshm(psc->base.dpy))
 806       swrastLoaderExtension.putImageShm = NULL;
 807
 808    for (i = 0; extensions[i]; i++) {
 809       if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
 810          psc->core = (__DRIcoreExtension *) extensions[i];
 811       if (strcmp(extensions[i]->name, __DRI_SWRAST) == 0)
 812          psc->swrast = (__DRIswrastExtension *) extensions[i];
 813       if (strcmp(extensions[i]->name, __DRI_COPY_SUB_BUFFER) == 0)
 814          psc->copySubBuffer = (__DRIcopySubBufferExtension *) extensions[i];
 815    }
 816
 817    if (psc->core == NULL || psc->swrast == NULL) {
 818       ErrorMessageF("core dri extension not found\n");
 819       goto handle_error;
 820    }
 821
 822    if (psc->swrast->base.version >= 4) {
 823       psc->driScreen =
 824          psc->swrast->createNewScreen2(screen, loader_extensions,
 825                                        extensions,
 826                                        &driver_configs, psc);
 827    } else {
 828       psc->driScreen =
 829          psc->swrast->createNewScreen(screen, loader_extensions,
 830                                       &driver_configs, psc);
 831    }
 832    if (psc->driScreen == NULL) {
 833       ErrorMessageF("failed to create dri screen\n");
 834       goto handle_error;
 835    }
 836
 837    extensions = psc->core->getExtensions(psc->driScreen);
 838    driswBindExtensions(psc, extensions);
 839
 840    configs = driConvertConfigs(psc->core, psc->base.configs, driver_configs);
 841    visuals = driConvertConfigs(psc->core, psc->base.visuals, driver_configs);
 842
 843    if (!configs || !visuals) {
 844        ErrorMessageF("No matching fbConfigs or visuals found\n");
 845        goto handle_error;
 846    }
 847
 848    glx_config_destroy_list(psc->base.configs);
 849    psc->base.configs = configs;
 850    glx_config_destroy_list(psc->base.visuals);
 851    psc->base.visuals = visuals;
 852
 853    psc->driver_configs = driver_configs;
 854
 855    psc->base.vtable = &drisw_screen_vtable;
 856    psp = &psc->vtable;
 857    psc->base.driScreen = psp;
 858    psp->destroyScreen = driswDestroyScreen;
 859    psp->createDrawable = driswCreateDrawable;
 860    psp->swapBuffers = driswSwapBuffers;
 861
 862    if (psc->copySubBuffer)
 863       psp->copySubBuffer = driswCopySubBuffer;
 864
 865    return &psc->base;
 866
 867  handle_error:
 868    if (configs)
 869        glx_config_destroy_list(configs);
 870    if (visuals)
 871        glx_config_destroy_list(visuals);
 872    if (psc->driScreen)
 873        psc->core->destroyScreen(psc->driScreen);
 874    psc->driScreen = NULL;
 875
 876    if (psc->driver)
 877       dlclose(psc->driver);
 878    glx_screen_cleanup(&psc->base);
 879    free(psc);
 880
 881    CriticalErrorMessageF("failed to load driver: %s\n", SWRAST_DRIVER_NAME);
 882
 883    return NULL;
 884 }
 885
 886 /* Called from __glXFreeDisplayPrivate.
 887  */
 888 static void
 889 driswDestroyDisplay(__GLXDRIdisplay * dpy)
 890 {
 891    free(dpy);
 892 }
 893
 894 /*
 895  * Allocate, initialize and return a __DRIdisplayPrivate object.
 896  * This is called from __glXInitialize() when we are given a new
 897  * display pointer.
 898  */
 899 _X_HIDDEN __GLXDRIdisplay *
 900 driswCreateDisplay(Display * dpy)
 901 {
 902    struct drisw_display *pdpyp;
 903
 904    pdpyp = malloc(sizeof *pdpyp);
 905    if (pdpyp == NULL)
 906       return NULL;
 907
 908    pdpyp->base.destroyDisplay = driswDestroyDisplay;
 909    pdpyp->base.createScreen = driswCreateScreen;
 910
 911    return &pdpyp->base;
 912 }
 913
 914 #endif /* GLX_DIRECT_RENDERING */