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