src/gallium/winsys/xlib/xm_winsys.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Bismarck, ND., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  18  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  19  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  20  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * The above copyright notice and this permission notice (including the
  23  * next paragraph) shall be included in all copies or substantial portions
  24  * of the Software.
  25  *
  26  *
  27  **************************************************************************/
  28
  29 /*
  30  * Authors:
  31  *   Keith Whitwell
  32  *   Brian Paul
  33  */
  34
  35
  36 #include "glxheader.h"
  37 #include "xmesaP.h"
  38
  39 #undef ASSERT
  40
  41 #include "pipe/p_winsys.h"
  42 #include "pipe/p_format.h"
  43 #include "pipe/p_context.h"
  44 #include "pipe/p_util.h"
  45 #include "pipe/p_inlines.h"
  46 #include "softpipe/sp_winsys.h"
  47
  48 #ifdef GALLIUM_CELL
  49 #include "cell/ppu/cell_context.h"
  50 #include "cell/ppu/cell_screen.h"
  51 #include "cell/ppu/cell_winsys.h"
  52 #else
  53 #define TILE_SIZE 32  /* avoid compilation errors */
  54 #endif
  55
  56 #include "xm_winsys_aub.h"
  57
  58
  59 /**
  60  * Low-level OS/window system memory buffer
  61  */
  62 struct xm_buffer
  63 {
  64    struct pipe_buffer base;
  65    boolean userBuffer;  /** Is this a user-space buffer? */
  66    void *data;
  67    void *mapped;
  68
  69    XImage *tempImage;
  70    int shm;
  71 #if defined(USE_XSHM) && !defined(XFree86Server)
  72    XShmSegmentInfo shminfo;
  73 #endif
  74 };
  75
  76 #if defined(USE_XSHM) && !defined(XFree86Server)
  77 # define XSHM_ENABLED(b) ((b)->shm)
  78 #else
  79 # define XSHM_ENABLED(b) 0
  80 #endif
  81
  82 struct xmesa_surface
  83 {
  84    struct pipe_surface surface;
  85
  86    int tileSize;
  87    boolean no_swap;
  88 };
  89
  90
  91 /**
  92  * Derived from softpipe_winsys.
  93  * We just need one extra field which indicates the pixel format to use for
  94  * drawing surfaces so that we're compatible with the XVisual/window format.
  95  */
  96 struct xmesa_softpipe_winsys
  97 {
  98    struct softpipe_winsys spws;
  99    enum pipe_format pixelformat;
 100 };
 101
 102
 103 struct xmesa_pipe_winsys
 104 {
 105    struct pipe_winsys base;
 106    struct xmesa_visual *xm_visual;
 107    int shm;
 108 };
 109
 110
 111 static void alloc_shm_ximage(struct xm_buffer *b, struct xmesa_buffer *xmb,
 112     unsigned width, unsigned height);
 113
 114 /** Cast wrapper */
 115 static INLINE struct xmesa_surface *
 116 xmesa_surface(struct pipe_surface *ps)
 117 {
 118 //   assert(0);
 119    return (struct xmesa_surface *) ps;
 120 }
 121
 122 /** cast wrapper */
 123 static INLINE struct xmesa_softpipe_winsys *
 124 xmesa_softpipe_winsys(struct softpipe_winsys *spws)
 125 {
 126    return (struct xmesa_softpipe_winsys *) spws;
 127 }
 128
 129 /**
 130  * Turn the softpipe opaque buffer pointer into a dri_bufmgr opaque
 131  * buffer pointer...
 132  */
 133 static INLINE struct xm_buffer *
 134 xm_buffer( struct pipe_buffer *buf )
 135 {
 136    return (struct xm_buffer *)buf;
 137 }
 138
 139
 140
 141 /* Most callbacks map direcly onto dri_bufmgr operations:
 142  */
 143 static void *
 144 xm_buffer_map(struct pipe_winsys *pws, struct pipe_buffer *buf,
 145               unsigned flags)
 146 {
 147    struct xm_buffer *xm_buf = xm_buffer(buf);
 148    xm_buf->mapped = xm_buf->data;
 149    return xm_buf->mapped;
 150 }
 151
 152 static void
 153 xm_buffer_unmap(struct pipe_winsys *pws, struct pipe_buffer *buf)
 154 {
 155    struct xm_buffer *xm_buf = xm_buffer(buf);
 156    xm_buf->mapped = NULL;
 157 }
 158
 159 static void
 160 xm_buffer_destroy(struct pipe_winsys *pws,
 161                   struct pipe_buffer *buf)
 162 {
 163    struct xm_buffer *oldBuf = xm_buffer(buf);
 164
 165    if (oldBuf->data) {
 166 #if defined(USE_XSHM) && !defined(XFree86Server)
 167       if (oldBuf->shminfo.shmid >= 0) {
 168          shmdt(oldBuf->shminfo.shmaddr);
 169          shmctl(oldBuf->shminfo.shmid, IPC_RMID, 0);
 170
 171          oldBuf->shminfo.shmid = -1;
 172          oldBuf->shminfo.shmaddr = (char *) -1;
 173       }
 174       else
 175 #endif
 176       {
 177          if (!oldBuf->userBuffer) {
 178             align_free(oldBuf->data);
 179          }
 180       }
 181
 182       oldBuf->data = NULL;
 183    }
 184
 185    free(oldBuf);
 186 }
 187
 188
 189 /**
 190  * Display a surface that's in a tiled configuration.  That is, all the
 191  * pixels for a TILE_SIZExTILE_SIZE block are contiguous in memory.
 192  */
 193 static void
 194 xmesa_display_surface_tiled(XMesaBuffer b, const struct pipe_surface *surf)
 195 {
 196    XImage *ximage;
 197    struct xm_buffer *xm_buf = xm_buffer(surf->buffer);
 198    const uint tilesPerRow = (surf->width + TILE_SIZE - 1) / TILE_SIZE;
 199    uint x, y;
 200
 201    /* check that the XImage has been previously initialized */
 202    assert(ximage->format);
 203    assert(ximage->bitmap_unit);
 204
 205    if (XSHM_ENABLED(xm_buf) && (xm_buf->tempImage == NULL)) {
 206       alloc_shm_ximage(xm_buf, b, TILE_SIZE, TILE_SIZE);
 207    }
 208
 209    ximage = (XSHM_ENABLED(xm_buf)) ? xm_buf->tempImage : b->tempImage;
 210
 211    if (!XSHM_ENABLED(xm_buf)) {
 212       /* update XImage's fields */
 213       ximage->width = TILE_SIZE;
 214       ximage->height = TILE_SIZE;
 215       ximage->bytes_per_line = TILE_SIZE * 4;
 216    }
 217
 218    for (y = 0; y < surf->height; y += TILE_SIZE) {
 219       for (x = 0; x < surf->width; x += TILE_SIZE) {
 220          int dx = x;
 221          int dy = y;
 222          int tx = x / TILE_SIZE;
 223          int ty = y / TILE_SIZE;
 224          int offset = ty * tilesPerRow + tx;
 225
 226          offset *= 4 * TILE_SIZE * TILE_SIZE;
 227
 228          ximage->data = (char *) xm_buf->data + offset;
 229
 230          if (XSHM_ENABLED(xm_buf)) {
 231 #if defined(USE_XSHM) && !defined(XFree86Server)
 232             XShmPutImage(b->xm_visual->display, b->drawable, b->gc,
 233                          ximage, 0, 0, x, y, TILE_SIZE, TILE_SIZE, False);
 234 #endif
 235          } else {
 236             XPutImage(b->xm_visual->display, b->drawable, b->gc,
 237                       ximage, 0, 0, dx, dy, TILE_SIZE, TILE_SIZE);
 238          }
 239       }
 240    }
 241 }
 242
 243
 244 /**
 245  * Display/copy the image in the surface into the X window specified
 246  * by the XMesaBuffer.
 247  */
 248 void
 249 xmesa_display_surface(XMesaBuffer b, const struct pipe_surface *surf)
 250 {
 251    XImage *ximage;
 252    struct xm_buffer *xm_buf = xm_buffer(surf->buffer);
 253    const struct xmesa_surface *xm_surf
 254       = xmesa_surface((struct pipe_surface *) surf);
 255
 256    if (xm_surf->no_swap)
 257       return;
 258
 259    if (xm_surf->tileSize) {
 260       xmesa_display_surface_tiled(b, surf);
 261       return;
 262    }
 263
 264
 265    if (XSHM_ENABLED(xm_buf) && (xm_buf->tempImage == NULL)) {
 266       alloc_shm_ximage(xm_buf, b, surf->pitch, surf->height);
 267    }
 268
 269    ximage = (XSHM_ENABLED(xm_buf)) ? xm_buf->tempImage : b->tempImage;
 270    ximage->data = xm_buf->data;
 271
 272    /* display image in Window */
 273    if (XSHM_ENABLED(xm_buf)) {
 274 #if defined(USE_XSHM) && !defined(XFree86Server)
 275       XShmPutImage(b->xm_visual->display, b->drawable, b->gc,
 276                    ximage, 0, 0, 0, 0, surf->width, surf->height, False);
 277 #endif
 278    } else {
 279       /* check that the XImage has been previously initialized */
 280       assert(ximage->format);
 281       assert(ximage->bitmap_unit);
 282
 283       /* update XImage's fields */
 284       ximage->width = surf->width;
 285       ximage->height = surf->height;
 286       ximage->bytes_per_line = surf->pitch * surf->cpp;
 287
 288       XPutImage(b->xm_visual->display, b->drawable, b->gc,
 289                 ximage, 0, 0, 0, 0, surf->width, surf->height);
 290    }
 291 }
 292
 293
 294 static void
 295 xm_flush_frontbuffer(struct pipe_winsys *pws,
 296                      struct pipe_surface *surf,
 297                      void *context_private)
 298 {
 299    /* The Xlib driver's front color surfaces are actually X Windows so
 300     * this flush is a no-op.
 301     * If we instead did front buffer rendering to a temporary XImage,
 302     * this would be the place to copy the Ximage to the on-screen Window.
 303     */
 304    XMesaContext xmctx = (XMesaContext) context_private;
 305    xmesa_display_surface(xmctx->xm_buffer, surf);
 306 }
 307
 308
 309
 310 static const char *
 311 xm_get_name(struct pipe_winsys *pws)
 312 {
 313    return "Xlib";
 314 }
 315
 316
 317 #if defined(USE_XSHM) && !defined(XFree86Server)
 318 static volatile int mesaXErrorFlag = 0;
 319
 320 /**
 321  * Catches potential Xlib errors.
 322  */
 323 static int
 324 mesaHandleXError(XMesaDisplay *dpy, XErrorEvent *event)
 325 {
 326    (void) dpy;
 327    (void) event;
 328    mesaXErrorFlag = 1;
 329    return 0;
 330 }
 331
 332
 333 static GLboolean alloc_shm(struct xm_buffer *buf, unsigned size)
 334 {
 335    XShmSegmentInfo *const shminfo = & buf->shminfo;
 336
 337    shminfo->shmid = shmget(IPC_PRIVATE, size, IPC_CREAT|0777);
 338    if (shminfo->shmid < 0) {
 339       return GL_FALSE;
 340    }
 341
 342    shminfo->shmaddr = (char *) shmat(shminfo->shmid, 0, 0);
 343    if (shminfo->shmaddr == (char *) -1) {
 344       shmctl(shminfo->shmid, IPC_RMID, 0);
 345       return GL_FALSE;
 346    }
 347
 348    shminfo->readOnly = False;
 349    return GL_TRUE;
 350 }
 351
 352
 353 /**
 354  * Allocate a shared memory XImage back buffer for the given XMesaBuffer.
 355  */
 356 static void
 357 alloc_shm_ximage(struct xm_buffer *b, struct xmesa_buffer *xmb,
 358                  unsigned width, unsigned height)
 359 {
 360    /*
 361     * We have to do a _lot_ of error checking here to be sure we can
 362     * really use the XSHM extension.  It seems different servers trigger
 363     * errors at different points if the extension won't work.  Therefore
 364     * we have to be very careful...
 365     */
 366 #if 0
 367    GC gc;
 368 #endif
 369    int (*old_handler)(XMesaDisplay *, XErrorEvent *);
 370
 371    b->tempImage = XShmCreateImage(xmb->xm_visual->display,
 372                                   xmb->xm_visual->visinfo->visual,
 373                                   xmb->xm_visual->visinfo->depth,
 374                                   ZPixmap,
 375                                   NULL,
 376                                   &b->shminfo,
 377                                   width, height);
 378    if (b->tempImage == NULL) {
 379       b->shm = 0;
 380       return;
 381    }
 382
 383
 384    mesaXErrorFlag = 0;
 385    old_handler = XSetErrorHandler(mesaHandleXError);
 386    /* This may trigger the X protocol error we're ready to catch: */
 387    XShmAttach(xmb->xm_visual->display, &b->shminfo);
 388    XSync(xmb->xm_visual->display, False);
 389
 390    if (mesaXErrorFlag) {
 391       /* we are on a remote display, this error is normal, don't print it */
 392       XFlush(xmb->xm_visual->display);
 393       mesaXErrorFlag = 0;
 394       XDestroyImage(b->tempImage);
 395       b->tempImage = NULL;
 396       b->shm = 0;
 397       (void) XSetErrorHandler(old_handler);
 398       return;
 399    }
 400
 401
 402    /* Finally, try an XShmPutImage to be really sure the extension works */
 403 #if 0
 404    gc = XCreateGC(xmb->xm_visual->display, xmb->drawable, 0, NULL);
 405    XShmPutImage(xmb->xm_visual->display, xmb->drawable, gc,
 406                 b->tempImage, 0, 0, 0, 0, 1, 1 /*one pixel*/, False);
 407    XSync(xmb->xm_visual->display, False);
 408    XFreeGC(xmb->xm_visual->display, gc);
 409    (void) XSetErrorHandler(old_handler);
 410    if (mesaXErrorFlag) {
 411       XFlush(xmb->xm_visual->display);
 412       mesaXErrorFlag = 0;
 413       XDestroyImage(b->tempImage);
 414       b->tempImage = NULL;
 415       b->shm = 0;
 416       return;
 417    }
 418 #endif
 419 }
 420 #else
 421 static void
 422 alloc_shm_ximage(struct xm_buffer *b, struct xmesa_buffer *xmb,
 423                  unsigned width, unsigned height)
 424 {
 425    b->shm = 0;
 426 }
 427 #endif
 428
 429
 430 static struct pipe_buffer *
 431 xm_buffer_create(struct pipe_winsys *pws,
 432                  unsigned alignment,
 433                  unsigned usage,
 434                  unsigned size)
 435 {
 436    struct xm_buffer *buffer = CALLOC_STRUCT(xm_buffer);
 437 #if defined(USE_XSHM) && !defined(XFree86Server)
 438    struct xmesa_pipe_winsys *xpws = (struct xmesa_pipe_winsys *) pws;
 439 #endif
 440
 441    buffer->base.refcount = 1;
 442    buffer->base.alignment = alignment;
 443    buffer->base.usage = usage;
 444    buffer->base.size = size;
 445
 446
 447 #if defined(USE_XSHM) && !defined(XFree86Server)
 448    buffer->shminfo.shmid = -1;
 449    buffer->shminfo.shmaddr = (char *) -1;
 450
 451    if (xpws->shm && (usage & PIPE_BUFFER_USAGE_PIXEL) != 0) {
 452       buffer->shm = xpws->shm;
 453
 454       if (alloc_shm(buffer, size)) {
 455          buffer->data = buffer->shminfo.shmaddr;
 456       }
 457    }
 458 #endif
 459
 460    if (buffer->data == NULL) {
 461       buffer->shm = 0;
 462
 463       /* align to 16-byte multiple for Cell */
 464       buffer->data = align_malloc(size, max(alignment, 16));
 465    }
 466
 467    return &buffer->base;
 468 }
 469
 470
 471 /**
 472  * Create buffer which wraps user-space data.
 473  */
 474 static struct pipe_buffer *
 475 xm_user_buffer_create(struct pipe_winsys *pws, void *ptr, unsigned bytes)
 476 {
 477    struct xm_buffer *buffer = CALLOC_STRUCT(xm_buffer);
 478    buffer->base.refcount = 1;
 479    buffer->base.size = bytes;
 480    buffer->userBuffer = TRUE;
 481    buffer->data = ptr;
 482    buffer->shm = 0;
 483
 484    return &buffer->base;
 485 }
 486
 487
 488
 489 /**
 490  * Round n up to next multiple.
 491  */
 492 static INLINE unsigned
 493 round_up(unsigned n, unsigned multiple)
 494 {
 495    return (n + multiple - 1) & ~(multiple - 1);
 496 }
 497
 498 static int
 499 xm_surface_alloc_storage(struct pipe_winsys *winsys,
 500                          struct pipe_surface *surf,
 501                          unsigned width, unsigned height,
 502                          enum pipe_format format,
 503                          unsigned flags)
 504 {
 505    const unsigned alignment = 64;
 506
 507    surf->width = width;
 508    surf->height = height;
 509    surf->format = format;
 510    surf->cpp = pf_get_size(format);
 511    surf->pitch = round_up(width, alignment / surf->cpp);
 512
 513 #ifdef GALLIUM_CELL /* XXX a bit of a hack */
 514    height = round_up(height, TILE_SIZE);
 515 #endif
 516
 517    assert(!surf->buffer);
 518    surf->buffer = winsys->buffer_create(winsys, alignment,
 519                                         PIPE_BUFFER_USAGE_PIXEL,
 520                                         surf->pitch * surf->cpp * height);
 521    if(!surf->buffer)
 522       return -1;
 523
 524    return 0;
 525 }
 526
 527
 528 /**
 529  * Called via pipe->surface_alloc() to create new surfaces (textures,
 530  * renderbuffers, etc.
 531  */
 532 static struct pipe_surface *
 533 xm_surface_alloc(struct pipe_winsys *ws)
 534 {
 535    struct xmesa_surface *xms = CALLOC_STRUCT(xmesa_surface);
 536    static boolean no_swap = 0;
 537    static boolean firsttime = 1;
 538
 539    if (firsttime) {
 540       no_swap = getenv("SP_NO_RAST") != NULL;
 541       firsttime = 0;
 542    }
 543
 544    assert(ws);
 545
 546    xms->surface.refcount = 1;
 547    xms->surface.winsys = ws;
 548
 549 #ifdef GALLIUM_CELL
 550    if (!getenv("GALLIUM_NOCELL")) {
 551       xms->tileSize = 32; /** probably temporary */
 552    }
 553 #endif
 554
 555    xms->no_swap = no_swap;
 556
 557    return &xms->surface;
 558 }
 559
 560
 561
 562 static void
 563 xm_surface_release(struct pipe_winsys *winsys, struct pipe_surface **s)
 564 {
 565    struct pipe_surface *surf = *s;
 566    surf->refcount--;
 567    if (surf->refcount == 0) {
 568       if (surf->buffer)
 569         pipe_buffer_reference(winsys, &surf->buffer, NULL);
 570       free(surf);
 571    }
 572    *s = NULL;
 573 }
 574
 575
 576 /*
 577  * Fence functions - basically nothing to do, as we don't create any actual
 578  * fence objects.
 579  */
 580
 581 static void
 582 xm_fence_reference(struct pipe_winsys *sws, struct pipe_fence_handle **ptr,
 583                    struct pipe_fence_handle *fence)
 584 {
 585 }
 586
 587
 588 static int
 589 xm_fence_signalled(struct pipe_winsys *sws, struct pipe_fence_handle *fence,
 590                    unsigned flag)
 591 {
 592    return 0;
 593 }
 594
 595
 596 static int
 597 xm_fence_finish(struct pipe_winsys *sws, struct pipe_fence_handle *fence,
 598                 unsigned flag)
 599 {
 600    return 0;
 601 }
 602
 603
 604 /**
 605  * Return pointer to a pipe_winsys object.
 606  * For Xlib, this is a singleton object.
 607  * Nothing special for the Xlib driver so no subclassing or anything.
 608  */
 609 struct pipe_winsys *
 610 xmesa_get_pipe_winsys_aub(struct xmesa_visual *xm_vis)
 611 {
 612    static struct xmesa_pipe_winsys *ws = NULL;
 613
 614    if (!ws && getenv("XM_AUB")) {
 615       ws = (struct xmesa_pipe_winsys *) xmesa_create_pipe_winsys_aub();
 616    }
 617    else if (!ws) {
 618       ws = CALLOC_STRUCT(xmesa_pipe_winsys);
 619
 620       ws->xm_visual = xm_vis;
 621       ws->shm = xmesa_check_for_xshm(xm_vis->display);
 622
 623       /* Fill in this struct with callbacks that pipe will need to
 624        * communicate with the window system, buffer manager, etc.
 625        */
 626       ws->base.buffer_create = xm_buffer_create;
 627       ws->base.user_buffer_create = xm_user_buffer_create;
 628       ws->base.buffer_map = xm_buffer_map;
 629       ws->base.buffer_unmap = xm_buffer_unmap;
 630       ws->base.buffer_destroy = xm_buffer_destroy;
 631
 632       ws->base.surface_alloc = xm_surface_alloc;
 633       ws->base.surface_alloc_storage = xm_surface_alloc_storage;
 634       ws->base.surface_release = xm_surface_release;
 635
 636       ws->base.fence_reference = xm_fence_reference;
 637       ws->base.fence_signalled = xm_fence_signalled;
 638       ws->base.fence_finish = xm_fence_finish;
 639
 640       ws->base.flush_frontbuffer = xm_flush_frontbuffer;
 641       ws->base.get_name = xm_get_name;
 642    }
 643
 644    return &ws->base;
 645 }
 646
 647
 648 /**
 649  * Called via softpipe_winsys->is_format_supported().
 650  * This function is only called to test formats for front/back color surfaces.
 651  * The winsys being queried will have been created at glXCreateContext
 652  * time, with a pixel format corresponding to the context's visual.
 653  */
 654 static boolean
 655 xmesa_is_format_supported(struct softpipe_winsys *sws,
 656                           enum pipe_format format)
 657 {
 658    struct xmesa_softpipe_winsys *xmws = xmesa_softpipe_winsys(sws);
 659    return (format == xmws->pixelformat);
 660 }
 661
 662
 663 /**
 664  * Return pointer to a softpipe_winsys object.
 665  */
 666 static struct softpipe_winsys *
 667 xmesa_get_softpipe_winsys(uint pixelformat)
 668 {
 669    struct xmesa_softpipe_winsys *xmws
 670       = CALLOC_STRUCT(xmesa_softpipe_winsys);
 671    if (!xmws)
 672       return NULL;
 673
 674    xmws->spws.is_format_supported = xmesa_is_format_supported;
 675    xmws->pixelformat = pixelformat;
 676
 677    return &xmws->spws;
 678 }
 679
 680
 681 struct pipe_context *
 682 xmesa_create_pipe_context(XMesaContext xmesa, uint pixelformat)
 683 {
 684    struct pipe_winsys *pws = xmesa_get_pipe_winsys_aub(xmesa->xm_visual);
 685    struct pipe_context *pipe;
 686
 687 #ifdef GALLIUM_CELL
 688    if (!getenv("GALLIUM_NOCELL")) {
 689       struct cell_winsys *cws = cell_get_winsys(pixelformat);
 690       struct pipe_screen *screen = cell_create_screen(pws);
 691
 692       pipe = cell_create_context(screen, cws);
 693    }
 694    else
 695 #endif
 696    {
 697       struct softpipe_winsys *spws = xmesa_get_softpipe_winsys(pixelformat);
 698       struct pipe_screen *screen = softpipe_create_screen(pws);
 699
 700       pipe = softpipe_create(screen, pws, spws);
 701    }
 702
 703    if (pipe)
 704       pipe->priv = xmesa;
 705
 706    return pipe;
 707 }