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 int xshm_error = 0;
  35 static int xshm_opcode = -1;
  36
  37 /**
  38  * Catches potential Xlib errors.
  39  */
  40 static int
  41 handle_xerror(Display *dpy, XErrorEvent *event)
  42 {
  43    (void) dpy;
  44
  45    assert(xshm_opcode != -1);
  46    if (event->request_code != xshm_opcode)
  47       return 0;
  48
  49    xshm_error = event->error_code;
  50    return 0;
  51 }
  52
  53 static Bool
  54 XCreateDrawable(struct drisw_drawable * pdp, int shmid, Display * dpy)
  55 {
  56    if (pdp->ximage) {
  57       XDestroyImage(pdp->ximage);
  58       pdp->ximage = NULL;
  59       if ((pdp->shminfo.shmid > 0) && (shmid != pdp->shminfo.shmid))
  60          XShmDetach(dpy, &pdp->shminfo);
  61    }
  62
  63    if (!xshm_error && shmid >= 0) {
  64       pdp->shminfo.shmid = shmid;
  65       pdp->ximage = XShmCreateImage(dpy,
  66                                     NULL,
  67                                     pdp->config->rgbBits,
  68                                     ZPixmap,              /* format */
  69                                     NULL,                 /* data */
  70                                     &pdp->shminfo,        /* shminfo */
  71                                     0, 0);                /* width, height */
  72       if (pdp->ximage != NULL) {
  73          int (*old_handler)(Display *, XErrorEvent *);
  74
  75          /* dispatch pending errors */
  76          XSync(dpy, False);
  77
  78          old_handler = XSetErrorHandler(handle_xerror);
  79          /* This may trigger the X protocol error we're ready to catch: */
  80          XShmAttach(dpy, &pdp->shminfo);
  81          XSync(dpy, False);
  82
  83          if (xshm_error) {
  84          /* we are on a remote display, this error is normal, don't print it */
  85             XDestroyImage(pdp->ximage);
  86             pdp->ximage = NULL;
  87          }
  88
  89          (void) XSetErrorHandler(old_handler);
  90       }
  91    }
  92
  93    if (pdp->ximage == NULL) {
  94       pdp->shminfo.shmid = -1;
  95       pdp->ximage = XCreateImage(dpy,
  96                                  NULL,
  97                                  pdp->config->rgbBits,
  98                                  ZPixmap, 0,             /* format, offset */
  99                                  NULL,                   /* data */
 100                                  0, 0,                   /* width, height */
 101                                  32,                     /* bitmap_pad */
 102                                  0);                     /* bytes_per_line */
 103    }
 104
 105   /**
 106    * swrast does not handle 24-bit depth with 24 bpp, so let X do the
 107    * the conversion for us.
 108    */
 109   if (pdp->ximage->bits_per_pixel == 24)
 110      pdp->ximage->bits_per_pixel = 32;
 111
 112    return True;
 113 }
 114
 115 static void
 116 XDestroyDrawable(struct drisw_drawable * pdp, Display * dpy, XID drawable)
 117 {
 118    if (pdp->ximage)
 119       XDestroyImage(pdp->ximage);
 120
 121    if (pdp->shminfo.shmid > 0)
 122       XShmDetach(dpy, &pdp->shminfo);
 123
 124    XFreeGC(dpy, pdp->gc);
 125 }
 126
 127 /**
 128  * swrast loader functions
 129  */
 130
 131 static void
 132 swrastGetDrawableInfo(__DRIdrawable * draw,
 133                       int *x, int *y, int *w, int *h,
 134                       void *loaderPrivate)
 135 {
 136    struct drisw_drawable *pdp = loaderPrivate;
 137    __GLXDRIdrawable *pdraw = &(pdp->base);
 138    Display *dpy = pdraw->psc->dpy;
 139    Drawable drawable;
 140
 141    Window root;
 142    unsigned uw, uh, bw, depth;
 143
 144    drawable = pdraw->xDrawable;
 145
 146    XGetGeometry(dpy, drawable, &root, x, y, &uw, &uh, &bw, &depth);
 147    *w = uw;
 148    *h = uh;
 149 }
 150
 151 /**
 152  * Align renderbuffer pitch.
 153  *
 154  * This should be chosen by the driver and the loader (libGL, xserver/glx)
 155  * should use the driver provided pitch.
 156  *
 157  * It seems that the xorg loader (that is the xserver loading swrast_dri for
 158  * indirect rendering, not client-side libGL) requires that the pitch is
 159  * exactly the image width padded to 32 bits. XXX
 160  *
 161  * The above restriction can probably be overcome by using ScratchPixmap and
 162  * CopyArea in the xserver, similar to ShmPutImage, and setting the width of
 163  * the scratch pixmap to 'pitch / cpp'.
 164  */
 165 static inline int
 166 bytes_per_line(unsigned pitch_bits, unsigned mul)
 167 {
 168    unsigned mask = mul - 1;
 169
 170    return ((pitch_bits + mask) & ~mask) / 8;
 171 }
 172
 173 static void
 174 swrastXPutImage(__DRIdrawable * draw, int op,
 175                 int srcx, int srcy, int x, int y,
 176                 int w, int h, int stride,
 177                 int shmid, 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 = pdp->gc;
 185
 186    if (!pdp->ximage || shmid != pdp->shminfo.shmid) {
 187       if (!XCreateDrawable(pdp, shmid, dpy))
 188          return;
 189    }
 190
 191    drawable = pdraw->xDrawable;
 192    ximage = pdp->ximage;
 193    ximage->bytes_per_line = stride ? stride : bytes_per_line(w * ximage->bits_per_pixel, 32);
 194    ximage->data = data;
 195
 196    if (pdp->shminfo.shmid >= 0) {
 197       ximage->width = ximage->bytes_per_line / ((ximage->bits_per_pixel + 7)/ 8);
 198       ximage->height = h;
 199       XShmPutImage(dpy, drawable, gc, ximage, srcx, srcy, x, y, w, h, False);
 200       XSync(dpy, False);
 201    } else {
 202       ximage->width = w;
 203       ximage->height = h;
 204       XPutImage(dpy, drawable, gc, ximage, srcx, srcy, x, y, w, h);
 205    }
 206    ximage->data = NULL;
 207 }
 208
 209 static void
 210 swrastPutImageShm(__DRIdrawable * draw, int op,
 211                   int x, int y, int w, int h, int stride,
 212                   int shmid, char *shmaddr, unsigned offset,
 213                   void *loaderPrivate)
 214 {
 215    struct drisw_drawable *pdp = loaderPrivate;
 216
 217    pdp->shminfo.shmaddr = shmaddr;
 218    swrastXPutImage(draw, op, 0, 0, x, y, w, h, stride, shmid,
 219                    shmaddr + offset, loaderPrivate);
 220 }
 221
 222 static void
 223 swrastPutImageShm2(__DRIdrawable * draw, int op,
 224                    int x, int y,
 225                    int w, int h, int stride,
 226                    int shmid, char *shmaddr, unsigned offset,
 227                    void *loaderPrivate)
 228 {
 229    struct drisw_drawable *pdp = loaderPrivate;
 230
 231    pdp->shminfo.shmaddr = shmaddr;
 232    swrastXPutImage(draw, op, x, 0, x, y, w, h, stride, shmid,
 233                    shmaddr + offset, loaderPrivate);
 234 }
 235
 236 static void
 237 swrastPutImage2(__DRIdrawable * draw, int op,
 238                 int x, int y, int w, int h, int stride,
 239                 char *data, void *loaderPrivate)
 240 {
 241    swrastXPutImage(draw, op, 0, 0, x, y, w, h, stride, -1,
 242                    data, loaderPrivate);
 243 }
 244
 245 static void
 246 swrastPutImage(__DRIdrawable * draw, int op,
 247                int x, int y, int w, int h,
 248                char *data, void *loaderPrivate)
 249 {
 250    swrastXPutImage(draw, op, 0, 0, x, y, w, h, 0, -1,
 251                    data, loaderPrivate);
 252 }
 253
 254 static void
 255 swrastGetImage2(__DRIdrawable * read,
 256                 int x, int y, int w, int h, int stride,
 257                 char *data, void *loaderPrivate)
 258 {
 259    struct drisw_drawable *prp = loaderPrivate;
 260    __GLXDRIdrawable *pread = &(prp->base);
 261    Display *dpy = pread->psc->dpy;
 262    Drawable readable;
 263    XImage *ximage;
 264
 265    if (!prp->ximage || prp->shminfo.shmid >= 0) {
 266       if (!XCreateDrawable(prp, -1, dpy))
 267          return;
 268    }
 269
 270    readable = pread->xDrawable;
 271
 272    ximage = prp->ximage;
 273    ximage->data = data;
 274    ximage->width = w;
 275    ximage->height = h;
 276    ximage->bytes_per_line = stride ? stride : bytes_per_line(w * ximage->bits_per_pixel, 32);
 277
 278    XGetSubImage(dpy, readable, x, y, w, h, ~0L, ZPixmap, ximage, 0, 0);
 279
 280    ximage->data = NULL;
 281 }
 282
 283 static void
 284 swrastGetImage(__DRIdrawable * read,
 285                int x, int y, int w, int h,
 286                char *data, void *loaderPrivate)
 287 {
 288    swrastGetImage2(read, x, y, w, h, 0, data, loaderPrivate);
 289 }
 290
 291 static void
 292 swrastGetImageShm(__DRIdrawable * read,
 293                   int x, int y, int w, int h,
 294                   int shmid, void *loaderPrivate)
 295 {
 296    struct drisw_drawable *prp = loaderPrivate;
 297    __GLXDRIdrawable *pread = &(prp->base);
 298    Display *dpy = pread->psc->dpy;
 299    Drawable readable;
 300    XImage *ximage;
 301
 302    if (!prp->ximage || shmid != prp->shminfo.shmid) {
 303       if (!XCreateDrawable(prp, shmid, dpy))
 304          return;
 305    }
 306    readable = pread->xDrawable;
 307
 308    ximage = prp->ximage;
 309    ximage->data = prp->shminfo.shmaddr; /* no offset */
 310    ximage->width = w;
 311    ximage->height = h;
 312    ximage->bytes_per_line = bytes_per_line(w * ximage->bits_per_pixel, 32);
 313
 314    XShmGetImage(dpy, readable, ximage, x, y, ~0L);
 315 }
 316
 317 static const __DRIswrastLoaderExtension swrastLoaderExtension_shm = {
 318    .base = {__DRI_SWRAST_LOADER, 5 },
 319
 320    .getDrawableInfo     = swrastGetDrawableInfo,
 321    .putImage            = swrastPutImage,
 322    .getImage            = swrastGetImage,
 323    .putImage2           = swrastPutImage2,
 324    .getImage2           = swrastGetImage2,
 325    .putImageShm         = swrastPutImageShm,
 326    .getImageShm         = swrastGetImageShm,
 327    .putImageShm2        = swrastPutImageShm2,
 328 };
 329
 330 static const __DRIextension *loader_extensions_shm[] = {
 331    &swrastLoaderExtension_shm.base,
 332    NULL
 333 };
 334
 335 static const __DRIswrastLoaderExtension swrastLoaderExtension = {
 336    .base = {__DRI_SWRAST_LOADER, 3 },
 337
 338    .getDrawableInfo     = swrastGetDrawableInfo,
 339    .putImage            = swrastPutImage,
 340    .getImage            = swrastGetImage,
 341    .putImage2           = swrastPutImage2,
 342    .getImage2           = swrastGetImage2,
 343 };
 344
 345 static const __DRIextension *loader_extensions_noshm[] = {
 346    &swrastLoaderExtension.base,
 347    NULL
 348 };
 349
 350 /**
 351  * GLXDRI functions
 352  */
 353
 354 static void
 355 drisw_destroy_context(struct glx_context *context)
 356 {
 357    struct drisw_context *pcp = (struct drisw_context *) context;
 358    struct drisw_screen *psc = (struct drisw_screen *) context->psc;
 359
 360    driReleaseDrawables(&pcp->base);
 361
 362    free((char *) context->extensions);
 363
 364    (*psc->core->destroyContext) (pcp->driContext);
 365
 366    free(pcp);
 367 }
 368
 369 static int
 370 drisw_bind_context(struct glx_context *context, struct glx_context *old,
 371                    GLXDrawable draw, GLXDrawable read)
 372 {
 373    struct drisw_context *pcp = (struct drisw_context *) context;
 374    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 375    struct drisw_drawable *pdraw, *pread;
 376
 377    pdraw = (struct drisw_drawable *) driFetchDrawable(context, draw);
 378    pread = (struct drisw_drawable *) driFetchDrawable(context, read);
 379
 380    driReleaseDrawables(&pcp->base);
 381
 382    if ((*psc->core->bindContext) (pcp->driContext,
 383                                   pdraw ? pdraw->driDrawable : NULL,
 384                                   pread ? pread->driDrawable : NULL))
 385       return Success;
 386
 387    return GLXBadContext;
 388 }
 389
 390 static void
 391 drisw_unbind_context(struct glx_context *context, struct glx_context *new)
 392 {
 393    struct drisw_context *pcp = (struct drisw_context *) context;
 394    struct drisw_screen *psc = (struct drisw_screen *) pcp->base.psc;
 395
 396    (*psc->core->unbindContext) (pcp->driContext);
 397 }
 398
 399 static void
 400 drisw_bind_tex_image(Display * dpy,
 401                     GLXDrawable drawable,
 402                     int buffer, const int *attrib_list)
 403 {
 404    struct glx_context *gc = __glXGetCurrentContext();
 405    struct drisw_context *pcp = (struct drisw_context *) gc;
 406    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 407    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 408    struct drisw_screen *psc;
 409
 410    __glXInitialize(dpy);
 411
 412    if (pdraw != NULL) {
 413       psc = (struct drisw_screen *) base->psc;
 414
 415       if (!psc->texBuffer)
 416          return;
 417
 418       if (psc->texBuffer->base.version >= 2 &&
 419         psc->texBuffer->setTexBuffer2 != NULL) {
 420               (*psc->texBuffer->setTexBuffer2) (pcp->driContext,
 421                                            pdraw->base.textureTarget,
 422                                            pdraw->base.textureFormat,
 423                                            pdraw->driDrawable);
 424       }
 425       else {
 426               (*psc->texBuffer->setTexBuffer) (pcp->driContext,
 427                                           pdraw->base.textureTarget,
 428                                           pdraw->driDrawable);
 429       }
 430    }
 431 }
 432
 433 static void
 434 drisw_release_tex_image(Display * dpy, GLXDrawable drawable, int buffer)
 435 {
 436    struct glx_context *gc = __glXGetCurrentContext();
 437    struct drisw_context *pcp = (struct drisw_context *) gc;
 438    __GLXDRIdrawable *base = GetGLXDRIDrawable(dpy, drawable);
 439    struct glx_display *dpyPriv = __glXInitialize(dpy);
 440    struct drisw_drawable *pdraw = (struct drisw_drawable *) base;
 441    struct drisw_screen *psc;
 442
 443    if (dpyPriv != NULL && pdraw != NULL) {
 444       psc = (struct drisw_screen *) base->psc;
 445
 446       if (!psc->texBuffer)
 447          return;
 448
 449       if (psc->texBuffer->base.version >= 3 &&
 450           psc->texBuffer->releaseTexBuffer != NULL) {
 451          (*psc->texBuffer->releaseTexBuffer) (pcp->driContext,
 452                                            pdraw->base.textureTarget,
 453                                            pdraw->driDrawable);
 454       }
 455    }
 456 }
 457
 458 static const struct glx_context_vtable drisw_context_vtable = {
 459    .destroy             = drisw_destroy_context,
 460    .bind                = drisw_bind_context,
 461    .unbind              = drisw_unbind_context,
 462    .wait_gl             = NULL,
 463    .wait_x              = NULL,
 464    .use_x_font          = DRI_glXUseXFont,
 465    .bind_tex_image      = drisw_bind_tex_image,
 466    .release_tex_image   = drisw_release_tex_image,
 467    .get_proc_address    = NULL,
 468 };
 469
 470 static struct glx_context *
 471 drisw_create_context(struct glx_screen *base,
 472                      struct glx_config *config_base,
 473                      struct glx_context *shareList, int renderType)
 474 {
 475    struct drisw_context *pcp, *pcp_shared;
 476    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 477    struct drisw_screen *psc = (struct drisw_screen *) base;
 478    __DRIcontext *shared = NULL;
 479
 480    if (!psc->base.driScreen)
 481       return NULL;
 482
 483    /* Check the renderType value */
 484    if (!validate_renderType_against_config(config_base, renderType))
 485        return NULL;
 486
 487    if (shareList) {
 488       /* If the shareList context is not a DRISW context, we cannot possibly
 489        * create a DRISW context that shares it.
 490        */
 491       if (shareList->vtable->destroy != drisw_destroy_context) {
 492          return NULL;
 493       }
 494
 495       pcp_shared = (struct drisw_context *) shareList;
 496       shared = pcp_shared->driContext;
 497    }
 498
 499    pcp = calloc(1, sizeof *pcp);
 500    if (pcp == NULL)
 501       return NULL;
 502
 503    if (!glx_context_init(&pcp->base, &psc->base, &config->base)) {
 504       free(pcp);
 505       return NULL;
 506    }
 507
 508    pcp->base.renderType = renderType;
 509
 510    pcp->driContext =
 511       (*psc->core->createNewContext) (psc->driScreen,
 512                                       config->driConfig, shared, pcp);
 513    if (pcp->driContext == NULL) {
 514       free(pcp);
 515       return NULL;
 516    }
 517
 518    pcp->base.vtable = &drisw_context_vtable;
 519
 520    return &pcp->base;
 521 }
 522
 523 static struct glx_context *
 524 drisw_create_context_attribs(struct glx_screen *base,
 525                              struct glx_config *config_base,
 526                              struct glx_context *shareList,
 527                              unsigned num_attribs,
 528                              const uint32_t *attribs,
 529                              unsigned *error)
 530 {
 531    struct drisw_context *pcp, *pcp_shared;
 532    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) config_base;
 533    struct drisw_screen *psc = (struct drisw_screen *) base;
 534    __DRIcontext *shared = NULL;
 535
 536    uint32_t minor_ver;
 537    uint32_t major_ver;
 538    uint32_t renderType;
 539    uint32_t flags;
 540    unsigned api;
 541    int reset;
 542    int release;
 543    uint32_t ctx_attribs[2 * 5];
 544    unsigned num_ctx_attribs = 0;
 545
 546    if (!psc->base.driScreen)
 547       return NULL;
 548
 549    if (psc->swrast->base.version < 3)
 550       return NULL;
 551
 552    /* Remap the GLX tokens to DRI2 tokens.
 553     */
 554    if (!dri2_convert_glx_attribs(num_attribs, attribs,
 555                                  &major_ver, &minor_ver, &renderType, &flags,
 556                                  &api, &reset, &release, error))
 557       return NULL;
 558
 559    if (!dri2_check_no_error(flags, shareList, major_ver, error))
 560       return NULL;
 561
 562    /* Check the renderType value */
 563    if (!validate_renderType_against_config(config_base, renderType)) {
 564        return NULL;
 565    }
 566
 567    if (reset != __DRI_CTX_RESET_NO_NOTIFICATION)
 568       return NULL;
 569
 570    if (release != __DRI_CTX_RELEASE_BEHAVIOR_FLUSH &&
 571        release != __DRI_CTX_RELEASE_BEHAVIOR_NONE)
 572       return NULL;
 573
 574    if (shareList) {
 575       pcp_shared = (struct drisw_context *) shareList;
 576       shared = pcp_shared->driContext;
 577    }
 578
 579    pcp = calloc(1, sizeof *pcp);
 580    if (pcp == NULL)
 581       return NULL;
 582
 583    if (!glx_context_init(&pcp->base, &psc->base, config_base)) {
 584       free(pcp);
 585       return NULL;
 586    }
 587
 588    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MAJOR_VERSION;
 589    ctx_attribs[num_ctx_attribs++] = major_ver;
 590    ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_MINOR_VERSION;
 591    ctx_attribs[num_ctx_attribs++] = minor_ver;
 592    if (release != __DRI_CTX_RELEASE_BEHAVIOR_FLUSH) {
 593        ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_RELEASE_BEHAVIOR;
 594        ctx_attribs[num_ctx_attribs++] = release;
 595    }
 596
 597    if (flags != 0) {
 598       ctx_attribs[num_ctx_attribs++] = __DRI_CTX_ATTRIB_FLAGS;
 599
 600       /* The current __DRI_CTX_FLAG_* values are identical to the
 601        * GLX_CONTEXT_*_BIT values.
 602        */
 603       ctx_attribs[num_ctx_attribs++] = flags;
 604
 605       if (flags & __DRI_CTX_FLAG_NO_ERROR)
 606          pcp->base.noError = GL_TRUE;
 607    }
 608
 609    pcp->base.renderType = renderType;
 610
 611    pcp->driContext =
 612       (*psc->swrast->createContextAttribs) (psc->driScreen,
 613                                             api,
 614                                             config ? config->driConfig : 0,
 615                                             shared,
 616                                             num_ctx_attribs / 2,
 617                                             ctx_attribs,
 618                                             error,
 619                                             pcp);
 620    if (pcp->driContext == NULL) {
 621       free(pcp);
 622       return NULL;
 623    }
 624
 625    pcp->base.vtable = &drisw_context_vtable;
 626
 627    return &pcp->base;
 628 }
 629
 630 static void
 631 driswDestroyDrawable(__GLXDRIdrawable * pdraw)
 632 {
 633    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 634    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 635
 636    (*psc->core->destroyDrawable) (pdp->driDrawable);
 637
 638    XDestroyDrawable(pdp, pdraw->psc->dpy, pdraw->drawable);
 639    free(pdp);
 640 }
 641
 642 static __GLXDRIdrawable *
 643 driswCreateDrawable(struct glx_screen *base, XID xDrawable,
 644                     GLXDrawable drawable, struct glx_config *modes)
 645 {
 646    struct drisw_drawable *pdp;
 647    __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) modes;
 648    struct drisw_screen *psc = (struct drisw_screen *) base;
 649    const __DRIswrastExtension *swrast = psc->swrast;
 650
 651    pdp = calloc(1, sizeof(*pdp));
 652    if (!pdp)
 653       return NULL;
 654
 655    pdp->base.xDrawable = xDrawable;
 656    pdp->base.drawable = drawable;
 657    pdp->base.psc = &psc->base;
 658    pdp->config = modes;
 659    pdp->gc = XCreateGC(psc->base.dpy, xDrawable, 0, NULL);
 660
 661    /* Create a new drawable */
 662    pdp->driDrawable =
 663       (*swrast->createNewDrawable) (psc->driScreen, config->driConfig, pdp);
 664
 665    if (!pdp->driDrawable) {
 666       XDestroyDrawable(pdp, psc->base.dpy, xDrawable);
 667       free(pdp);
 668       return NULL;
 669    }
 670
 671    pdp->base.destroyDrawable = driswDestroyDrawable;
 672
 673    return &pdp->base;
 674 }
 675
 676 static int64_t
 677 driswSwapBuffers(__GLXDRIdrawable * pdraw,
 678                  int64_t target_msc, int64_t divisor, int64_t remainder,
 679                  Bool flush)
 680 {
 681    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 682    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 683
 684    (void) target_msc;
 685    (void) divisor;
 686    (void) remainder;
 687
 688    if (flush) {
 689       glFlush();
 690    }
 691
 692    (*psc->core->swapBuffers) (pdp->driDrawable);
 693
 694    return 0;
 695 }
 696
 697 static void
 698 driswCopySubBuffer(__GLXDRIdrawable * pdraw,
 699                    int x, int y, int width, int height, Bool flush)
 700 {
 701    struct drisw_drawable *pdp = (struct drisw_drawable *) pdraw;
 702    struct drisw_screen *psc = (struct drisw_screen *) pdp->base.psc;
 703
 704    if (flush) {
 705       glFlush();
 706    }
 707
 708    (*psc->copySubBuffer->copySubBuffer) (pdp->driDrawable,
 709                                             x, y, width, height);
 710 }
 711
 712 static void
 713 driswDestroyScreen(struct glx_screen *base)
 714 {
 715    struct drisw_screen *psc = (struct drisw_screen *) base;
 716
 717    /* Free the direct rendering per screen data */
 718    (*psc->core->destroyScreen) (psc->driScreen);
 719    driDestroyConfigs(psc->driver_configs);
 720    psc->driScreen = NULL;
 721    if (psc->driver)
 722       dlclose(psc->driver);
 723    free(psc);
 724 }
 725
 726 #define SWRAST_DRIVER_NAME "swrast"
 727
 728 static const struct glx_screen_vtable drisw_screen_vtable = {
 729    .create_context         = drisw_create_context,
 730    .create_context_attribs = drisw_create_context_attribs,
 731    .query_renderer_integer = drisw_query_renderer_integer,
 732    .query_renderer_string  = drisw_query_renderer_string,
 733 };
 734
 735 static void
 736 driswBindExtensions(struct drisw_screen *psc, const __DRIextension **extensions)
 737 {
 738    int i;
 739
 740    __glXEnableDirectExtension(&psc->base, "GLX_SGI_make_current_read");
 741
 742    if (psc->swrast->base.version >= 3) {
 743       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context");
 744       __glXEnableDirectExtension(&psc->base, "GLX_ARB_create_context_profile");
 745
 746       /* DRISW version >= 2 implies support for OpenGL ES.
 747        */
 748       __glXEnableDirectExtension(&psc->base,
 749                                  "GLX_EXT_create_context_es_profile");
 750       __glXEnableDirectExtension(&psc->base,
 751                                  "GLX_EXT_create_context_es2_profile");
 752    }
 753
 754    if (psc->copySubBuffer)
 755       __glXEnableDirectExtension(&psc->base, "GLX_MESA_copy_sub_buffer");
 756
 757    /* FIXME: Figure out what other extensions can be ported here from dri2. */
 758    for (i = 0; extensions[i]; i++) {
 759       if ((strcmp(extensions[i]->name, __DRI_TEX_BUFFER) == 0)) {
 760          psc->texBuffer = (__DRItexBufferExtension *) extensions[i];
 761          __glXEnableDirectExtension(&psc->base, "GLX_EXT_texture_from_pixmap");
 762       }
 763       /* DRISW version 3 is also required because GLX_MESA_query_renderer
 764        * requires GLX_ARB_create_context_profile.
 765        */
 766       if (psc->swrast->base.version >= 3
 767           && strcmp(extensions[i]->name, __DRI2_RENDERER_QUERY) == 0) {
 768          psc->rendererQuery = (__DRI2rendererQueryExtension *) extensions[i];
 769          __glXEnableDirectExtension(&psc->base, "GLX_MESA_query_renderer");
 770       }
 771       if (strcmp(extensions[i]->name, __DRI2_FLUSH_CONTROL) == 0) {
 772           __glXEnableDirectExtension(&psc->base,
 773                                      "GLX_ARB_context_flush_control");
 774       }
 775    }
 776 }
 777
 778 static int
 779 check_xshm(Display *dpy)
 780 {
 781    int (*old_handler)(Display *, XErrorEvent *);
 782
 783    int ignore;
 784    XShmSegmentInfo info = { 0, };
 785
 786    if (!XQueryExtension(dpy, "MIT-SHM", &xshm_opcode, &ignore, &ignore))
 787       return False;
 788
 789    old_handler = XSetErrorHandler(handle_xerror);
 790    XShmDetach(dpy, &info);
 791    XSync(dpy, False);
 792    (void) XSetErrorHandler(old_handler);
 793
 794    /* BadRequest means we're a remote client. If we were local we'd
 795     * expect BadValue since 'info' has an invalid segment name.
 796     */
 797    if (xshm_error == BadRequest)
 798       return False;
 799
 800    xshm_error = 0;
 801    return True;
 802 }
 803
 804 static struct glx_screen *
 805 driswCreateScreen(int screen, struct glx_display *priv)
 806 {
 807    __GLXDRIscreen *psp;
 808    const __DRIconfig **driver_configs;
 809    const __DRIextension **extensions;
 810    struct drisw_screen *psc;
 811    struct glx_config *configs = NULL, *visuals = NULL;
 812    int i;
 813    const __DRIextension **loader_extensions_local;
 814
 815    psc = calloc(1, sizeof *psc);
 816    if (psc == NULL)
 817       return NULL;
 818
 819    if (!glx_screen_init(&psc->base, screen, priv)) {
 820       free(psc);
 821       return NULL;
 822    }
 823
 824    extensions = driOpenDriver(SWRAST_DRIVER_NAME, &psc->driver);
 825    if (extensions == NULL)
 826       goto handle_error;
 827
 828    if (!check_xshm(psc->base.dpy))
 829       loader_extensions_local = loader_extensions_noshm;
 830    else
 831       loader_extensions_local = loader_extensions_shm;
 832
 833    for (i = 0; extensions[i]; i++) {
 834       if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
 835          psc->core = (__DRIcoreExtension *) extensions[i];
 836       if (strcmp(extensions[i]->name, __DRI_SWRAST) == 0)
 837          psc->swrast = (__DRIswrastExtension *) extensions[i];
 838       if (strcmp(extensions[i]->name, __DRI_COPY_SUB_BUFFER) == 0)
 839          psc->copySubBuffer = (__DRIcopySubBufferExtension *) extensions[i];
 840    }
 841
 842    if (psc->core == NULL || psc->swrast == NULL) {
 843       ErrorMessageF("core dri extension not found\n");
 844       goto handle_error;
 845    }
 846
 847    if (psc->swrast->base.version >= 4) {
 848       psc->driScreen =
 849          psc->swrast->createNewScreen2(screen, loader_extensions_local,
 850                                        extensions,
 851                                        &driver_configs, psc);
 852    } else {
 853       psc->driScreen =
 854          psc->swrast->createNewScreen(screen, loader_extensions_local,
 855                                       &driver_configs, psc);
 856    }
 857    if (psc->driScreen == NULL) {
 858       ErrorMessageF("failed to create dri screen\n");
 859       goto handle_error;
 860    }
 861
 862    extensions = psc->core->getExtensions(psc->driScreen);
 863    driswBindExtensions(psc, extensions);
 864
 865    configs = driConvertConfigs(psc->core, psc->base.configs, driver_configs);
 866    visuals = driConvertConfigs(psc->core, psc->base.visuals, driver_configs);
 867
 868    if (!configs || !visuals) {
 869        ErrorMessageF("No matching fbConfigs or visuals found\n");
 870        goto handle_error;
 871    }
 872
 873    glx_config_destroy_list(psc->base.configs);
 874    psc->base.configs = configs;
 875    glx_config_destroy_list(psc->base.visuals);
 876    psc->base.visuals = visuals;
 877
 878    psc->driver_configs = driver_configs;
 879
 880    psc->base.vtable = &drisw_screen_vtable;
 881    psp = &psc->vtable;
 882    psc->base.driScreen = psp;
 883    psp->destroyScreen = driswDestroyScreen;
 884    psp->createDrawable = driswCreateDrawable;
 885    psp->swapBuffers = driswSwapBuffers;
 886
 887    if (psc->copySubBuffer)
 888       psp->copySubBuffer = driswCopySubBuffer;
 889
 890    return &psc->base;
 891
 892  handle_error:
 893    if (configs)
 894        glx_config_destroy_list(configs);
 895    if (visuals)
 896        glx_config_destroy_list(visuals);
 897    if (psc->driScreen)
 898        psc->core->destroyScreen(psc->driScreen);
 899    psc->driScreen = NULL;
 900
 901    if (psc->driver)
 902       dlclose(psc->driver);
 903    glx_screen_cleanup(&psc->base);
 904    free(psc);
 905
 906    CriticalErrorMessageF("failed to load driver: %s\n", SWRAST_DRIVER_NAME);
 907
 908    return NULL;
 909 }
 910
 911 /* Called from __glXFreeDisplayPrivate.
 912  */
 913 static void
 914 driswDestroyDisplay(__GLXDRIdisplay * dpy)
 915 {
 916    free(dpy);
 917 }
 918
 919 /*
 920  * Allocate, initialize and return a __DRIdisplayPrivate object.
 921  * This is called from __glXInitialize() when we are given a new
 922  * display pointer.
 923  */
 924 _X_HIDDEN __GLXDRIdisplay *
 925 driswCreateDisplay(Display * dpy)
 926 {
 927    struct drisw_display *pdpyp;
 928
 929    pdpyp = malloc(sizeof *pdpyp);
 930    if (pdpyp == NULL)
 931       return NULL;
 932
 933    pdpyp->base.destroyDisplay = driswDestroyDisplay;
 934    pdpyp->base.createScreen = driswCreateScreen;
 935
 936    return &pdpyp->base;
 937 }
 938
 939 #endif /* GLX_DIRECT_RENDERING */