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 #undef Elements
  41
  42 #include "pipe/p_winsys.h"
  43 #include "pipe/p_format.h"
  44 #include "pipe/p_context.h"
  45 #include "pipe/p_inlines.h"
  46 #include "util/u_math.h"
  47 #include "util/u_memory.h"
  48 #include "softpipe/sp_winsys.h"
  49
  50 #ifdef GALLIUM_CELL
  51 #include "cell/ppu/cell_context.h"
  52 #include "cell/ppu/cell_screen.h"
  53 #include "cell/ppu/cell_winsys.h"
  54 #else
  55 #define TILE_SIZE 32  /* avoid compilation errors */
  56 #endif
  57
  58 #ifdef GALLIUM_TRACE
  59 #include "trace/tr_screen.h"
  60 #include "trace/tr_context.h"
  61 #endif
  62
  63 #include "xm_winsys_aub.h"
  64
  65
  66 /**
  67  * Subclass of pipe_buffer for Xlib winsys.
  68  * Low-level OS/window system memory buffer
  69  */
  70 struct xm_buffer
  71 {
  72    struct pipe_buffer base;
  73    boolean userBuffer;  /** Is this a user-space buffer? */
  74    void *data;
  75    void *mapped;
  76
  77    XImage *tempImage;
  78    int shm;
  79 #if defined(USE_XSHM) && !defined(XFree86Server)
  80    XShmSegmentInfo shminfo;
  81 #endif
  82 };
  83
  84
  85 /**
  86  * Subclass of pipe_winsys for Xlib winsys
  87  */
  88 struct xmesa_pipe_winsys
  89 {
  90    struct pipe_winsys base;
  91    struct xmesa_visual *xm_visual;
  92    int shm;
  93 };
  94
  95
  96
  97 /** Cast wrapper */
  98 static INLINE struct xm_buffer *
  99 xm_buffer( struct pipe_buffer *buf )
 100 {
 101    return (struct xm_buffer *)buf;
 102 }
 103
 104
 105 /**
 106  * X Shared Memory Image extension code
 107  */
 108 #if defined(USE_XSHM) && !defined(XFree86Server)
 109
 110 #define XSHM_ENABLED(b) ((b)->shm)
 111
 112 static volatile int mesaXErrorFlag = 0;
 113
 114 /**
 115  * Catches potential Xlib errors.
 116  */
 117 static int
 118 mesaHandleXError(XMesaDisplay *dpy, XErrorEvent *event)
 119 {
 120    (void) dpy;
 121    (void) event;
 122    mesaXErrorFlag = 1;
 123    return 0;
 124 }
 125
 126
 127 static GLboolean alloc_shm(struct xm_buffer *buf, unsigned size)
 128 {
 129    XShmSegmentInfo *const shminfo = & buf->shminfo;
 130
 131    shminfo->shmid = shmget(IPC_PRIVATE, size, IPC_CREAT|0777);
 132    if (shminfo->shmid < 0) {
 133       return GL_FALSE;
 134    }
 135
 136    shminfo->shmaddr = (char *) shmat(shminfo->shmid, 0, 0);
 137    if (shminfo->shmaddr == (char *) -1) {
 138       shmctl(shminfo->shmid, IPC_RMID, 0);
 139       return GL_FALSE;
 140    }
 141
 142    shminfo->readOnly = False;
 143    return GL_TRUE;
 144 }
 145
 146
 147 /**
 148  * Allocate a shared memory XImage back buffer for the given XMesaBuffer.
 149  */
 150 static void
 151 alloc_shm_ximage(struct xm_buffer *b, struct xmesa_buffer *xmb,
 152                  unsigned width, unsigned height)
 153 {
 154    /*
 155     * We have to do a _lot_ of error checking here to be sure we can
 156     * really use the XSHM extension.  It seems different servers trigger
 157     * errors at different points if the extension won't work.  Therefore
 158     * we have to be very careful...
 159     */
 160 #if 0
 161    GC gc;
 162 #endif
 163    int (*old_handler)(XMesaDisplay *, XErrorEvent *);
 164
 165    b->tempImage = XShmCreateImage(xmb->xm_visual->display,
 166                                   xmb->xm_visual->visinfo->visual,
 167                                   xmb->xm_visual->visinfo->depth,
 168                                   ZPixmap,
 169                                   NULL,
 170                                   &b->shminfo,
 171                                   width, height);
 172    if (b->tempImage == NULL) {
 173       b->shm = 0;
 174       return;
 175    }
 176
 177
 178    mesaXErrorFlag = 0;
 179    old_handler = XSetErrorHandler(mesaHandleXError);
 180    /* This may trigger the X protocol error we're ready to catch: */
 181    XShmAttach(xmb->xm_visual->display, &b->shminfo);
 182    XSync(xmb->xm_visual->display, False);
 183
 184    if (mesaXErrorFlag) {
 185       /* we are on a remote display, this error is normal, don't print it */
 186       XFlush(xmb->xm_visual->display);
 187       mesaXErrorFlag = 0;
 188       XDestroyImage(b->tempImage);
 189       b->tempImage = NULL;
 190       b->shm = 0;
 191       (void) XSetErrorHandler(old_handler);
 192       return;
 193    }
 194
 195
 196    /* Finally, try an XShmPutImage to be really sure the extension works */
 197 #if 0
 198    gc = XCreateGC(xmb->xm_visual->display, xmb->drawable, 0, NULL);
 199    XShmPutImage(xmb->xm_visual->display, xmb->drawable, gc,
 200                 b->tempImage, 0, 0, 0, 0, 1, 1 /*one pixel*/, False);
 201    XSync(xmb->xm_visual->display, False);
 202    XFreeGC(xmb->xm_visual->display, gc);
 203    (void) XSetErrorHandler(old_handler);
 204    if (mesaXErrorFlag) {
 205       XFlush(xmb->xm_visual->display);
 206       mesaXErrorFlag = 0;
 207       XDestroyImage(b->tempImage);
 208       b->tempImage = NULL;
 209       b->shm = 0;
 210       return;
 211    }
 212 #endif
 213 }
 214
 215 #else
 216
 217 #define XSHM_ENABLED(b) 0
 218
 219 static void
 220 alloc_shm_ximage(struct xm_buffer *b, struct xmesa_buffer *xmb,
 221                  unsigned width, unsigned height)
 222 {
 223    b->shm = 0;
 224 }
 225 #endif /* USE_XSHM */
 226
 227
 228
 229
 230 /* Most callbacks map direcly onto dri_bufmgr operations:
 231  */
 232 static void *
 233 xm_buffer_map(struct pipe_winsys *pws, struct pipe_buffer *buf,
 234               unsigned flags)
 235 {
 236    struct xm_buffer *xm_buf = xm_buffer(buf);
 237    xm_buf->mapped = xm_buf->data;
 238    return xm_buf->mapped;
 239 }
 240
 241 static void
 242 xm_buffer_unmap(struct pipe_winsys *pws, struct pipe_buffer *buf)
 243 {
 244    struct xm_buffer *xm_buf = xm_buffer(buf);
 245    xm_buf->mapped = NULL;
 246 }
 247
 248 static void
 249 xm_buffer_destroy(struct pipe_winsys *pws,
 250                   struct pipe_buffer *buf)
 251 {
 252    struct xm_buffer *oldBuf = xm_buffer(buf);
 253
 254    if (oldBuf->data) {
 255 #if defined(USE_XSHM) && !defined(XFree86Server)
 256       if (oldBuf->shminfo.shmid >= 0) {
 257          shmdt(oldBuf->shminfo.shmaddr);
 258          shmctl(oldBuf->shminfo.shmid, IPC_RMID, 0);
 259
 260          oldBuf->shminfo.shmid = -1;
 261          oldBuf->shminfo.shmaddr = (char *) -1;
 262       }
 263       else
 264 #endif
 265       {
 266          if (!oldBuf->userBuffer) {
 267             align_free(oldBuf->data);
 268          }
 269       }
 270
 271       oldBuf->data = NULL;
 272    }
 273
 274    free(oldBuf);
 275 }
 276
 277
 278 /**
 279  * For Cell.  Basically, rearrange the pixels/quads from this layout:
 280  *  +--+--+--+--+
 281  *  |p0|p1|p2|p3|....
 282  *  +--+--+--+--+
 283  *
 284  * to this layout:
 285  *  +--+--+
 286  *  |p0|p1|....
 287  *  +--+--+
 288  *  |p2|p3|
 289  *  +--+--+
 290  */
 291 static void
 292 twiddle_tile(const uint *tileIn, uint *tileOut)
 293 {
 294    int y, x;
 295
 296    for (y = 0; y < TILE_SIZE; y+=2) {
 297       for (x = 0; x < TILE_SIZE; x+=2) {
 298          int k = 4 * (y/2 * TILE_SIZE/2 + x/2);
 299          tileOut[y * TILE_SIZE + (x + 0)] = tileIn[k];
 300          tileOut[y * TILE_SIZE + (x + 1)] = tileIn[k+1];
 301          tileOut[(y + 1) * TILE_SIZE + (x + 0)] = tileIn[k+2];
 302          tileOut[(y + 1) * TILE_SIZE + (x + 1)] = tileIn[k+3];
 303       }
 304    }
 305 }
 306
 307
 308
 309 /**
 310  * Display a surface that's in a tiled configuration.  That is, all the
 311  * pixels for a TILE_SIZExTILE_SIZE block are contiguous in memory.
 312  */
 313 static void
 314 xmesa_display_surface_tiled(XMesaBuffer b, const struct pipe_surface *surf)
 315 {
 316    XImage *ximage;
 317    struct xm_buffer *xm_buf = xm_buffer(surf->buffer);
 318    const uint tilesPerRow = (surf->width + TILE_SIZE - 1) / TILE_SIZE;
 319    uint x, y;
 320
 321    if (XSHM_ENABLED(xm_buf) && (xm_buf->tempImage == NULL)) {
 322       alloc_shm_ximage(xm_buf, b, TILE_SIZE, TILE_SIZE);
 323    }
 324
 325    ximage = (XSHM_ENABLED(xm_buf)) ? xm_buf->tempImage : b->tempImage;
 326
 327    /* check that the XImage has been previously initialized */
 328    assert(ximage->format);
 329    assert(ximage->bitmap_unit);
 330
 331    if (!XSHM_ENABLED(xm_buf)) {
 332       /* update XImage's fields */
 333       ximage->width = TILE_SIZE;
 334       ximage->height = TILE_SIZE;
 335       ximage->bytes_per_line = TILE_SIZE * 4;
 336    }
 337
 338    for (y = 0; y < surf->height; y += TILE_SIZE) {
 339       for (x = 0; x < surf->width; x += TILE_SIZE) {
 340          uint tmpTile[TILE_SIZE * TILE_SIZE];
 341          int tx = x / TILE_SIZE;
 342          int ty = y / TILE_SIZE;
 343          int offset = ty * tilesPerRow + tx;
 344          int w = TILE_SIZE;
 345          int h = TILE_SIZE;
 346
 347          if (y + h > surf->height)
 348             h = surf->height - y;
 349          if (x + w > surf->width)
 350             w = surf->width - x;
 351
 352          /* offset in pixels */
 353          offset *= TILE_SIZE * TILE_SIZE;
 354
 355          if (0 && XSHM_ENABLED(xm_buf)) {
 356             ximage->data = (char *) xm_buf->data + 4 * offset;
 357             /* make copy of tile data */
 358             memcpy(tmpTile, (uint *) ximage->data, sizeof(tmpTile));
 359             /* twiddle from temp to ximage in shared memory */
 360             twiddle_tile(tmpTile, (uint *) ximage->data);
 361             /* display image in shared memory */
 362 #if defined(USE_XSHM) && !defined(XFree86Server)
 363             XShmPutImage(b->xm_visual->display, b->drawable, b->gc,
 364                          ximage, 0, 0, x, y, w, h, False);
 365 #endif
 366          }
 367          else {
 368             /* twiddle from ximage buffer to temp tile */
 369             twiddle_tile((uint *) xm_buf->data + offset, tmpTile);
 370             /* display temp tile data */
 371             ximage->data = (char *) tmpTile;
 372             XPutImage(b->xm_visual->display, b->drawable, b->gc,
 373                       ximage, 0, 0, x, y, w, h);
 374          }
 375       }
 376    }
 377 }
 378
 379
 380 /**
 381  * Display/copy the image in the surface into the X window specified
 382  * by the XMesaBuffer.
 383  */
 384 void
 385 xmesa_display_surface(XMesaBuffer b, const struct pipe_surface *surf)
 386 {
 387    XImage *ximage;
 388    struct xm_buffer *xm_buf = xm_buffer(surf->buffer);
 389    static boolean no_swap = 0;
 390    static boolean firsttime = 1;
 391    static int tileSize = 0;
 392
 393    if (firsttime) {
 394       no_swap = getenv("SP_NO_RAST") != NULL;
 395 #ifdef GALLIUM_CELL
 396       if (!getenv("GALLIUM_NOCELL")) {
 397          tileSize = 32; /** probably temporary */
 398       }
 399 #endif
 400       firsttime = 0;
 401    }
 402
 403    if (no_swap)
 404       return;
 405
 406    if (tileSize) {
 407       xmesa_display_surface_tiled(b, surf);
 408       return;
 409    }
 410
 411    if (XSHM_ENABLED(xm_buf) && (xm_buf->tempImage == NULL)) {
 412       assert(surf->block.width == 1);
 413       assert(surf->block.height == 1);
 414       alloc_shm_ximage(xm_buf, b, surf->stride/surf->block.size, surf->height);
 415    }
 416
 417    ximage = (XSHM_ENABLED(xm_buf)) ? xm_buf->tempImage : b->tempImage;
 418    ximage->data = xm_buf->data;
 419
 420    /* display image in Window */
 421    if (XSHM_ENABLED(xm_buf)) {
 422 #if defined(USE_XSHM) && !defined(XFree86Server)
 423       XShmPutImage(b->xm_visual->display, b->drawable, b->gc,
 424                    ximage, 0, 0, 0, 0, surf->width, surf->height, False);
 425 #endif
 426    } else {
 427       /* check that the XImage has been previously initialized */
 428       assert(ximage->format);
 429       assert(ximage->bitmap_unit);
 430
 431       /* update XImage's fields */
 432       ximage->width = surf->width;
 433       ximage->height = surf->height;
 434       ximage->bytes_per_line = surf->stride;
 435
 436       XPutImage(b->xm_visual->display, b->drawable, b->gc,
 437                 ximage, 0, 0, 0, 0, surf->width, surf->height);
 438    }
 439 }
 440
 441
 442 static void
 443 xm_flush_frontbuffer(struct pipe_winsys *pws,
 444                      struct pipe_surface *surf,
 445                      void *context_private)
 446 {
 447    /*
 448     * The front color buffer is actually just another XImage buffer.
 449     * This function copies that XImage to the actual X Window.
 450     */
 451    XMesaContext xmctx = (XMesaContext) context_private;
 452    xmesa_display_surface(xmctx->xm_buffer, surf);
 453 }
 454
 455
 456
 457 static const char *
 458 xm_get_name(struct pipe_winsys *pws)
 459 {
 460    return "Xlib";
 461 }
 462
 463
 464 static struct pipe_buffer *
 465 xm_buffer_create(struct pipe_winsys *pws,
 466                  unsigned alignment,
 467                  unsigned usage,
 468                  unsigned size)
 469 {
 470    struct xm_buffer *buffer = CALLOC_STRUCT(xm_buffer);
 471 #if defined(USE_XSHM) && !defined(XFree86Server)
 472    struct xmesa_pipe_winsys *xpws = (struct xmesa_pipe_winsys *) pws;
 473 #endif
 474
 475    buffer->base.refcount = 1;
 476    buffer->base.alignment = alignment;
 477    buffer->base.usage = usage;
 478    buffer->base.size = size;
 479
 480
 481 #if defined(USE_XSHM) && !defined(XFree86Server)
 482    buffer->shminfo.shmid = -1;
 483    buffer->shminfo.shmaddr = (char *) -1;
 484
 485    if (xpws->shm && (usage & PIPE_BUFFER_USAGE_PIXEL) != 0) {
 486       buffer->shm = xpws->shm;
 487
 488       if (alloc_shm(buffer, size)) {
 489          buffer->data = buffer->shminfo.shmaddr;
 490       }
 491    }
 492 #endif
 493
 494    if (buffer->data == NULL) {
 495       buffer->shm = 0;
 496
 497       /* align to 16-byte multiple for Cell */
 498       buffer->data = align_malloc(size, max(alignment, 16));
 499    }
 500
 501    return &buffer->base;
 502 }
 503
 504
 505 /**
 506  * Create buffer which wraps user-space data.
 507  */
 508 static struct pipe_buffer *
 509 xm_user_buffer_create(struct pipe_winsys *pws, void *ptr, unsigned bytes)
 510 {
 511    struct xm_buffer *buffer = CALLOC_STRUCT(xm_buffer);
 512    buffer->base.refcount = 1;
 513    buffer->base.size = bytes;
 514    buffer->userBuffer = TRUE;
 515    buffer->data = ptr;
 516    buffer->shm = 0;
 517
 518    return &buffer->base;
 519 }
 520
 521
 522
 523 /**
 524  * Round n up to next multiple.
 525  */
 526 static INLINE unsigned
 527 round_up(unsigned n, unsigned multiple)
 528 {
 529    return (n + multiple - 1) & ~(multiple - 1);
 530 }
 531
 532 static int
 533 xm_surface_alloc_storage(struct pipe_winsys *winsys,
 534                          struct pipe_surface *surf,
 535                          unsigned width, unsigned height,
 536                          enum pipe_format format,
 537                          unsigned flags,
 538                          unsigned tex_usage)
 539 {
 540    const unsigned alignment = 64;
 541
 542    surf->width = width;
 543    surf->height = height;
 544    surf->format = format;
 545    pf_get_block(format, &surf->block);
 546    surf->nblocksx = pf_get_nblocksx(&surf->block, width);
 547    surf->nblocksy = pf_get_nblocksy(&surf->block, height);
 548    surf->stride = round_up(surf->nblocksx * surf->block.size, alignment);
 549    surf->usage = flags;
 550
 551    assert(!surf->buffer);
 552    surf->buffer = winsys->buffer_create(winsys, alignment,
 553                                         PIPE_BUFFER_USAGE_PIXEL,
 554 #ifdef GALLIUM_CELL /* XXX a bit of a hack */
 555                                         surf->stride * round_up(surf->nblocksy, TILE_SIZE));
 556 #else
 557                                         surf->stride * surf->nblocksy);
 558 #endif
 559
 560    if(!surf->buffer)
 561       return -1;
 562
 563    return 0;
 564 }
 565
 566
 567 /**
 568  * Called via winsys->surface_alloc() to create new surfaces.
 569  */
 570 static struct pipe_surface *
 571 xm_surface_alloc(struct pipe_winsys *ws)
 572 {
 573    struct pipe_surface *surface = CALLOC_STRUCT(pipe_surface);
 574
 575    assert(ws);
 576
 577    surface->refcount = 1;
 578    surface->winsys = ws;
 579
 580    return surface;
 581 }
 582
 583
 584
 585 static void
 586 xm_surface_release(struct pipe_winsys *winsys, struct pipe_surface **s)
 587 {
 588    struct pipe_surface *surf = *s;
 589    assert(!surf->texture);
 590    surf->refcount--;
 591    if (surf->refcount == 0) {
 592       if (surf->buffer)
 593         winsys_buffer_reference(winsys, &surf->buffer, NULL);
 594       free(surf);
 595    }
 596    *s = NULL;
 597 }
 598
 599
 600 /*
 601  * Fence functions - basically nothing to do, as we don't create any actual
 602  * fence objects.
 603  */
 604
 605 static void
 606 xm_fence_reference(struct pipe_winsys *sws, struct pipe_fence_handle **ptr,
 607                    struct pipe_fence_handle *fence)
 608 {
 609 }
 610
 611
 612 static int
 613 xm_fence_signalled(struct pipe_winsys *sws, struct pipe_fence_handle *fence,
 614                    unsigned flag)
 615 {
 616    return 0;
 617 }
 618
 619
 620 static int
 621 xm_fence_finish(struct pipe_winsys *sws, struct pipe_fence_handle *fence,
 622                 unsigned flag)
 623 {
 624    return 0;
 625 }
 626
 627
 628 /**
 629  * Return pointer to a pipe_winsys object.
 630  * For Xlib, this is a singleton object.
 631  * Nothing special for the Xlib driver so no subclassing or anything.
 632  */
 633 struct pipe_winsys *
 634 xmesa_get_pipe_winsys_aub(struct xmesa_visual *xm_vis)
 635 {
 636    static struct xmesa_pipe_winsys *ws = NULL;
 637
 638    if (!ws) {
 639       ws = (struct xmesa_pipe_winsys *) xmesa_create_pipe_winsys_aub();
 640    }
 641    return &ws->base;
 642 }
 643
 644
 645 static struct pipe_winsys *
 646 xmesa_get_pipe_winsys(struct xmesa_visual *xm_vis)
 647 {
 648    static struct xmesa_pipe_winsys *ws = NULL;
 649
 650    if (!ws) {
 651       ws = CALLOC_STRUCT(xmesa_pipe_winsys);
 652
 653       ws->xm_visual = xm_vis;
 654       ws->shm = xmesa_check_for_xshm(xm_vis->display);
 655
 656       /* Fill in this struct with callbacks that pipe will need to
 657        * communicate with the window system, buffer manager, etc.
 658        */
 659       ws->base.buffer_create = xm_buffer_create;
 660       ws->base.user_buffer_create = xm_user_buffer_create;
 661       ws->base.buffer_map = xm_buffer_map;
 662       ws->base.buffer_unmap = xm_buffer_unmap;
 663       ws->base.buffer_destroy = xm_buffer_destroy;
 664
 665       ws->base.surface_alloc = xm_surface_alloc;
 666       ws->base.surface_alloc_storage = xm_surface_alloc_storage;
 667       ws->base.surface_release = xm_surface_release;
 668
 669       ws->base.fence_reference = xm_fence_reference;
 670       ws->base.fence_signalled = xm_fence_signalled;
 671       ws->base.fence_finish = xm_fence_finish;
 672
 673       ws->base.flush_frontbuffer = xm_flush_frontbuffer;
 674       ws->base.get_name = xm_get_name;
 675    }
 676
 677    return &ws->base;
 678 }
 679
 680
 681 struct pipe_context *
 682 xmesa_create_pipe_context(XMesaContext xmesa, uint pixelformat)
 683 {
 684    struct pipe_winsys *pws;
 685    struct pipe_context *pipe;
 686
 687    if (getenv("XM_AUB")) {
 688       pws = xmesa_get_pipe_winsys_aub(xmesa->xm_visual);
 689    }
 690    else {
 691       pws = xmesa_get_pipe_winsys(xmesa->xm_visual);
 692    }
 693
 694 #ifdef GALLIUM_CELL
 695    if (!getenv("GALLIUM_NOCELL")) {
 696       struct cell_winsys *cws = cell_get_winsys(pixelformat);
 697       struct pipe_screen *screen = cell_create_screen(pws);
 698
 699       pipe = cell_create_context(screen, cws);
 700    }
 701    else
 702 #endif
 703    {
 704       struct pipe_screen *screen = softpipe_create_screen(pws);
 705
 706       pipe = softpipe_create(screen, pws, NULL);
 707
 708 #ifdef GALLIUM_TRACE
 709       screen = trace_screen_create(screen);
 710
 711       pipe = trace_context_create(screen, pipe);
 712 #endif
 713    }
 714
 715    if (pipe)
 716       pipe->priv = xmesa;
 717
 718    return pipe;
 719 }