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