src/gallium/winsys/xlib/xlib_softpipe.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 "xm_api.h"
  37
  38 #undef ASSERT
  39 #undef Elements
  40
  41 #include "pipe/internal/p_winsys_screen.h"
  42 #include "pipe/p_format.h"
  43 #include "pipe/p_context.h"
  44 #include "pipe/p_inlines.h"
  45 #include "util/u_format.h"
  46 #include "util/u_math.h"
  47 #include "util/u_memory.h"
  48 #include "softpipe/sp_winsys.h"
  49 #include "softpipe/sp_texture.h"
  50
  51 #include "xlib.h"
  52
  53 /**
  54  * Subclass of pipe_buffer for Xlib winsys.
  55  * Low-level OS/window system memory buffer
  56  */
  57 struct xm_buffer
  58 {
  59    struct pipe_buffer base;
  60    boolean userBuffer;  /** Is this a user-space buffer? */
  61    void *data;
  62    void *mapped;
  63
  64    XImage *tempImage;
  65 #ifdef USE_XSHM
  66    int shm;
  67    XShmSegmentInfo shminfo;
  68 #endif
  69 };
  70
  71
  72 /**
  73  * Subclass of pipe_winsys for Xlib winsys
  74  */
  75 struct xmesa_pipe_winsys
  76 {
  77    struct pipe_winsys base;
  78 /*   struct xmesa_visual *xm_visual; */
  79 };
  80
  81
  82
  83 /** Cast wrapper */
  84 static INLINE struct xm_buffer *
  85 xm_buffer( struct pipe_buffer *buf )
  86 {
  87    return (struct xm_buffer *)buf;
  88 }
  89
  90
  91 /**
  92  * X Shared Memory Image extension code
  93  */
  94
  95 #ifdef USE_XSHM
  96
  97 static volatile int mesaXErrorFlag = 0;
  98
  99 /**
 100  * Catches potential Xlib errors.
 101  */
 102 static int
 103 mesaHandleXError(Display *dpy, XErrorEvent *event)
 104 {
 105    (void) dpy;
 106    (void) event;
 107    mesaXErrorFlag = 1;
 108    return 0;
 109 }
 110
 111
 112 static char *alloc_shm(struct xm_buffer *buf, unsigned size)
 113 {
 114    XShmSegmentInfo *const shminfo = & buf->shminfo;
 115
 116    shminfo->shmid = shmget(IPC_PRIVATE, size, IPC_CREAT|0777);
 117    if (shminfo->shmid < 0) {
 118       return NULL;
 119    }
 120
 121    shminfo->shmaddr = (char *) shmat(shminfo->shmid, 0, 0);
 122    if (shminfo->shmaddr == (char *) -1) {
 123       shmctl(shminfo->shmid, IPC_RMID, 0);
 124       return NULL;
 125    }
 126
 127    shminfo->readOnly = False;
 128    return shminfo->shmaddr;
 129 }
 130
 131
 132 /**
 133  * Allocate a shared memory XImage back buffer for the given XMesaBuffer.
 134  */
 135 static void
 136 alloc_shm_ximage(struct xm_buffer *b, struct xmesa_buffer *xmb,
 137                  unsigned width, unsigned height)
 138 {
 139    /*
 140     * We have to do a _lot_ of error checking here to be sure we can
 141     * really use the XSHM extension.  It seems different servers trigger
 142     * errors at different points if the extension won't work.  Therefore
 143     * we have to be very careful...
 144     */
 145    int (*old_handler)(Display *, XErrorEvent *);
 146
 147    b->tempImage = XShmCreateImage(xmb->xm_visual->display,
 148                                   xmb->xm_visual->visinfo->visual,
 149                                   xmb->xm_visual->visinfo->depth,
 150                                   ZPixmap,
 151                                   NULL,
 152                                   &b->shminfo,
 153                                   width, height);
 154    if (b->tempImage == NULL) {
 155       b->shm = 0;
 156       return;
 157    }
 158
 159
 160    mesaXErrorFlag = 0;
 161    old_handler = XSetErrorHandler(mesaHandleXError);
 162    /* This may trigger the X protocol error we're ready to catch: */
 163    XShmAttach(xmb->xm_visual->display, &b->shminfo);
 164    XSync(xmb->xm_visual->display, False);
 165
 166    if (mesaXErrorFlag) {
 167       /* we are on a remote display, this error is normal, don't print it */
 168       XFlush(xmb->xm_visual->display);
 169       mesaXErrorFlag = 0;
 170       XDestroyImage(b->tempImage);
 171       b->tempImage = NULL;
 172       b->shm = 0;
 173       (void) XSetErrorHandler(old_handler);
 174       return;
 175    }
 176
 177    b->shm = 1;
 178 }
 179
 180 #endif /* USE_XSHM */
 181
 182
 183
 184 /* Most callbacks map direcly onto dri_bufmgr operations:
 185  */
 186 static void *
 187 xm_buffer_map(struct pipe_winsys *pws, struct pipe_buffer *buf,
 188               unsigned flags)
 189 {
 190    struct xm_buffer *xm_buf = xm_buffer(buf);
 191    xm_buf->mapped = xm_buf->data;
 192    return xm_buf->mapped;
 193 }
 194
 195 static void
 196 xm_buffer_unmap(struct pipe_winsys *pws, struct pipe_buffer *buf)
 197 {
 198    struct xm_buffer *xm_buf = xm_buffer(buf);
 199    xm_buf->mapped = NULL;
 200 }
 201
 202 static void
 203 xm_buffer_destroy(struct pipe_buffer *buf)
 204 {
 205    struct xm_buffer *oldBuf = xm_buffer(buf);
 206
 207    /*
 208     * Note oldBuf->data may point to one of three things:
 209     * 1. XShm shared memory image data
 210     * 2. User-provided (wrapped) memory, see xm_user_buffer_create()
 211     * 3. Regular, malloc'd memory
 212     * We need to be careful with freeing that data now.
 213     */
 214
 215    if (oldBuf->data) {
 216 #ifdef USE_XSHM
 217       if (oldBuf->shminfo.shmid >= 0) {
 218          shmdt(oldBuf->shminfo.shmaddr);
 219          shmctl(oldBuf->shminfo.shmid, IPC_RMID, 0);
 220
 221          oldBuf->shminfo.shmid = -1;
 222          oldBuf->shminfo.shmaddr = (char *) -1;
 223       }
 224
 225       if (oldBuf->tempImage) {
 226          if (oldBuf->data == oldBuf->tempImage->data) {
 227             /* oldBuf->data points at the xshm memory which we'll now free */
 228             oldBuf->data = NULL;
 229          }
 230          XDestroyImage(oldBuf->tempImage);
 231       }
 232 #endif
 233
 234       if (oldBuf->data && !oldBuf->userBuffer) {
 235          /* this was regular malloc'd memory */
 236          align_free(oldBuf->data);
 237       }
 238
 239       oldBuf->data = NULL;
 240    }
 241
 242    free(oldBuf);
 243 }
 244
 245
 246 /**
 247  * Display/copy the image in the surface into the X window specified
 248  * by the XMesaBuffer.
 249  */
 250 static void
 251 xlib_softpipe_display_surface(struct xmesa_buffer *b,
 252                               struct pipe_surface *surf)
 253 {
 254    XImage *ximage;
 255    struct softpipe_texture *spt = softpipe_texture(surf->texture);
 256    struct xm_buffer *xm_buf = xm_buffer(spt->buffer);
 257    static boolean no_swap = 0;
 258    static boolean firsttime = 1;
 259
 260    if (firsttime) {
 261       no_swap = getenv("SP_NO_RAST") != NULL;
 262       firsttime = 0;
 263    }
 264
 265    if (no_swap)
 266       return;
 267
 268 #ifdef USE_XSHM
 269    if (xm_buf->shm)
 270    {
 271       if (xm_buf->tempImage == NULL)
 272       {
 273          assert(util_format_get_blockwidth(surf->texture->format) == 1);
 274          assert(util_format_get_blockheight(surf->texture->format) == 1);
 275          alloc_shm_ximage(xm_buf, b, spt->stride[surf->level] /
 276                           util_format_get_blocksize(surf->texture->format), surf->height);
 277       }
 278
 279       ximage = xm_buf->tempImage;
 280       ximage->data = xm_buf->data;
 281
 282       /* _debug_printf("XSHM\n"); */
 283       XShmPutImage(b->xm_visual->display, b->drawable, b->gc,
 284                    ximage, 0, 0, 0, 0, surf->width, surf->height, False);
 285    }
 286    else
 287 #endif
 288    {
 289       /* display image in Window */
 290       ximage = b->tempImage;
 291       ximage->data = xm_buf->data;
 292
 293       /* check that the XImage has been previously initialized */
 294       assert(ximage->format);
 295       assert(ximage->bitmap_unit);
 296
 297       /* update XImage's fields */
 298       ximage->width = surf->width;
 299       ximage->height = surf->height;
 300       ximage->bytes_per_line = spt->stride[surf->level];
 301
 302       /* _debug_printf("XPUT\n"); */
 303       XPutImage(b->xm_visual->display, b->drawable, b->gc,
 304                 ximage, 0, 0, 0, 0, surf->width, surf->height);
 305    }
 306 }
 307
 308
 309 static void
 310 xm_flush_frontbuffer(struct pipe_winsys *pws,
 311                      struct pipe_surface *surf,
 312                      void *context_private)
 313 {
 314    /*
 315     * The front color buffer is actually just another XImage buffer.
 316     * This function copies that XImage to the actual X Window.
 317     */
 318    XMesaContext xmctx = (XMesaContext) context_private;
 319    xlib_softpipe_display_surface(xmctx->xm_buffer, surf);
 320    xmesa_check_and_update_buffer_size(xmctx, xmctx->xm_buffer);
 321 }
 322
 323
 324
 325 static const char *
 326 xm_get_name(struct pipe_winsys *pws)
 327 {
 328    return "Xlib";
 329 }
 330
 331
 332 static struct pipe_buffer *
 333 xm_buffer_create(struct pipe_winsys *pws,
 334                  unsigned alignment,
 335                  unsigned usage,
 336                  unsigned size)
 337 {
 338    struct xm_buffer *buffer = CALLOC_STRUCT(xm_buffer);
 339
 340    pipe_reference_init(&buffer->base.reference, 1);
 341    buffer->base.alignment = alignment;
 342    buffer->base.usage = usage;
 343    buffer->base.size = size;
 344
 345    if (buffer->data == NULL) {
 346       /* align to 16-byte multiple for Cell */
 347       buffer->data = align_malloc(size, max(alignment, 16));
 348    }
 349
 350    return &buffer->base;
 351 }
 352
 353
 354 /**
 355  * Create buffer which wraps user-space data.
 356  */
 357 static struct pipe_buffer *
 358 xm_user_buffer_create(struct pipe_winsys *pws, void *ptr, unsigned bytes)
 359 {
 360    struct xm_buffer *buffer = CALLOC_STRUCT(xm_buffer);
 361    pipe_reference_init(&buffer->base.reference, 1);
 362    buffer->base.size = bytes;
 363    buffer->userBuffer = TRUE;
 364    buffer->data = ptr;
 365
 366    return &buffer->base;
 367 }
 368
 369
 370 static struct pipe_buffer *
 371 xm_surface_buffer_create(struct pipe_winsys *winsys,
 372                          unsigned width, unsigned height,
 373                          enum pipe_format format,
 374                          unsigned usage,
 375                          unsigned tex_usage,
 376                          unsigned *stride)
 377 {
 378    const unsigned alignment = 64;
 379    unsigned nblocksy, size;
 380
 381    nblocksy = util_format_get_nblocksy(format, height);
 382    *stride = align(util_format_get_stride(format, width), alignment);
 383    size = *stride * nblocksy;
 384
 385 #ifdef USE_XSHM
 386    if (!debug_get_bool_option("XLIB_NO_SHM", FALSE))
 387    {
 388       struct xm_buffer *buffer = CALLOC_STRUCT(xm_buffer);
 389
 390       pipe_reference_init(&buffer->base.reference, 1);
 391       buffer->base.alignment = alignment;
 392       buffer->base.usage = usage;
 393       buffer->base.size = size;
 394       buffer->userBuffer = FALSE;
 395       buffer->shminfo.shmid = -1;
 396       buffer->shminfo.shmaddr = (char *) -1;
 397       buffer->shm = TRUE;
 398
 399       buffer->data = alloc_shm(buffer, size);
 400       if (!buffer->data)
 401          goto out;
 402
 403       return &buffer->base;
 404
 405    out:
 406       if (buffer)
 407          FREE(buffer);
 408    }
 409 #endif
 410
 411
 412    return winsys->buffer_create(winsys, alignment,
 413                                 usage,
 414                                 size);
 415 }
 416
 417
 418 /*
 419  * Fence functions - basically nothing to do, as we don't create any actual
 420  * fence objects.
 421  */
 422
 423 static void
 424 xm_fence_reference(struct pipe_winsys *sws, struct pipe_fence_handle **ptr,
 425                    struct pipe_fence_handle *fence)
 426 {
 427 }
 428
 429
 430 static int
 431 xm_fence_signalled(struct pipe_winsys *sws, struct pipe_fence_handle *fence,
 432                    unsigned flag)
 433 {
 434    return 0;
 435 }
 436
 437
 438 static int
 439 xm_fence_finish(struct pipe_winsys *sws, struct pipe_fence_handle *fence,
 440                 unsigned flag)
 441 {
 442    return 0;
 443 }
 444
 445
 446
 447 static struct pipe_winsys *
 448 xlib_create_softpipe_winsys( void )
 449 {
 450    static struct xmesa_pipe_winsys *ws = NULL;
 451
 452    if (!ws) {
 453       ws = CALLOC_STRUCT(xmesa_pipe_winsys);
 454
 455       /* Fill in this struct with callbacks that pipe will need to
 456        * communicate with the window system, buffer manager, etc.
 457        */
 458       ws->base.buffer_create = xm_buffer_create;
 459       ws->base.user_buffer_create = xm_user_buffer_create;
 460       ws->base.buffer_map = xm_buffer_map;
 461       ws->base.buffer_unmap = xm_buffer_unmap;
 462       ws->base.buffer_destroy = xm_buffer_destroy;
 463
 464       ws->base.surface_buffer_create = xm_surface_buffer_create;
 465
 466       ws->base.fence_reference = xm_fence_reference;
 467       ws->base.fence_signalled = xm_fence_signalled;
 468       ws->base.fence_finish = xm_fence_finish;
 469
 470       ws->base.flush_frontbuffer = xm_flush_frontbuffer;
 471       ws->base.get_name = xm_get_name;
 472    }
 473
 474    return &ws->base;
 475 }
 476
 477
 478 static struct pipe_screen *
 479 xlib_create_softpipe_screen( void )
 480 {
 481    struct pipe_winsys *winsys;
 482    struct pipe_screen *screen;
 483
 484    winsys = xlib_create_softpipe_winsys();
 485    if (winsys == NULL)
 486       return NULL;
 487
 488    screen = softpipe_create_screen(winsys);
 489    if (screen == NULL)
 490       goto fail;
 491
 492    return screen;
 493
 494 fail:
 495    if (winsys)
 496       winsys->destroy( winsys );
 497
 498    return NULL;
 499 }
 500
 501
 502 static struct pipe_context *
 503 xlib_create_softpipe_context( struct pipe_screen *screen,
 504                               void *context_private )
 505 {
 506    struct pipe_context *pipe;
 507
 508    pipe = softpipe_create(screen);
 509    if (pipe == NULL)
 510       goto fail;
 511
 512    pipe->priv = context_private;
 513    return pipe;
 514
 515 fail:
 516    /* Free stuff here */
 517    return NULL;
 518 }
 519
 520 struct xm_driver xlib_softpipe_driver =
 521 {
 522    .create_pipe_screen = xlib_create_softpipe_screen,
 523    .create_pipe_context = xlib_create_softpipe_context,
 524    .display_surface = xlib_softpipe_display_surface
 525 };
 526
 527
 528