summaryrefslogtreecommitdiffstats
path: root/src/gallium/winsys/xlib/xlib_softpipe.c
blob: 277e724d2acc107ca88cf6770b13246add318870 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
/**************************************************************************
 * 
 * Copyright 2007 Tungsten Graphics, Inc., Bismarck, ND., USA
 * All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 * 
 * 
 **************************************************************************/

/*
 * Authors:
 *   Keith Whitwell
 *   Brian Paul
 */


#include "xm_api.h"

#undef ASSERT
#undef Elements

#include "pipe/internal/p_winsys_screen.h"
#include "pipe/p_format.h"
#include "pipe/p_context.h"
#include "pipe/p_inlines.h"
#include "util/u_math.h"
#include "util/u_memory.h"
#include "softpipe/sp_winsys.h"
#include "softpipe/sp_texture.h"

#include "xlib.h"

/**
 * Subclass of pipe_buffer for Xlib winsys.
 * Low-level OS/window system memory buffer
 */
struct xm_buffer
{
   struct pipe_buffer base;
   boolean userBuffer;  /** Is this a user-space buffer? */
   void *data;
   void *mapped;

   XImage *tempImage;
#ifdef USE_XSHM
   int shm;
   XShmSegmentInfo shminfo;
#endif
};


/**
 * Subclass of pipe_winsys for Xlib winsys
 */
struct xmesa_pipe_winsys
{
   struct pipe_winsys base;
/*   struct xmesa_visual *xm_visual; */
#ifdef USE_XSHM
   int shm;
#endif
};



/** Cast wrapper */
static INLINE struct xm_buffer *
xm_buffer( struct pipe_buffer *buf )
{
   return (struct xm_buffer *)buf;
}


/**
 * X Shared Memory Image extension code
 */
#ifdef USE_XSHM
#define XSHM_ENABLED(b) ((b)->shm)
#else
#define XSHM_ENABLED(b) 0
#endif

#ifdef USE_XSHM

static volatile int mesaXErrorFlag = 0;

/**
 * Catches potential Xlib errors.
 */
static int
mesaHandleXError(Display *dpy, XErrorEvent *event)
{
   (void) dpy;
   (void) event;
   mesaXErrorFlag = 1;
   return 0;
}


static GLboolean alloc_shm(struct xm_buffer *buf, unsigned size)
{
   XShmSegmentInfo *const shminfo = & buf->shminfo;

   shminfo->shmid = shmget(IPC_PRIVATE, size, IPC_CREAT|0777);
   if (shminfo->shmid < 0) {
      return GL_FALSE;
   }

   shminfo->shmaddr = (char *) shmat(shminfo->shmid, 0, 0);
   if (shminfo->shmaddr == (char *) -1) {
      shmctl(shminfo->shmid, IPC_RMID, 0);
      return GL_FALSE;
   }

   shminfo->readOnly = False;
   return GL_TRUE;
}


/**
 * Allocate a shared memory XImage back buffer for the given XMesaBuffer.
 */
static void
alloc_shm_ximage(struct xm_buffer *b, struct xmesa_buffer *xmb,
                 unsigned width, unsigned height)
{
   /*
    * We have to do a _lot_ of error checking here to be sure we can
    * really use the XSHM extension.  It seems different servers trigger
    * errors at different points if the extension won't work.  Therefore
    * we have to be very careful...
    */
   int (*old_handler)(Display *, XErrorEvent *);

   b->tempImage = XShmCreateImage(xmb->xm_visual->display,
                                  xmb->xm_visual->visinfo->visual,
                                  xmb->xm_visual->visinfo->depth,
                                  ZPixmap,
                                  NULL,
                                  &b->shminfo,
                                  width, height);
   if (b->tempImage == NULL) {
      b->shm = 0;
      return;
   }


   mesaXErrorFlag = 0;
   old_handler = XSetErrorHandler(mesaHandleXError);
   /* This may trigger the X protocol error we're ready to catch: */
   XShmAttach(xmb->xm_visual->display, &b->shminfo);
   XSync(xmb->xm_visual->display, False);

   if (mesaXErrorFlag) {
      /* we are on a remote display, this error is normal, don't print it */
      XFlush(xmb->xm_visual->display);
      mesaXErrorFlag = 0;
      XDestroyImage(b->tempImage);
      b->tempImage = NULL;
      b->shm = 0;
      (void) XSetErrorHandler(old_handler);
      return;
   }

   b->shm = 1;
}

#endif /* USE_XSHM */



/* Most callbacks map direcly onto dri_bufmgr operations:
 */
static void *
xm_buffer_map(struct pipe_winsys *pws, struct pipe_buffer *buf,
              unsigned flags)
{
   struct xm_buffer *xm_buf = xm_buffer(buf);
   xm_buf->mapped = xm_buf->data;
   return xm_buf->mapped;
}

static void
xm_buffer_unmap(struct pipe_winsys *pws, struct pipe_buffer *buf)
{
   struct xm_buffer *xm_buf = xm_buffer(buf);
   xm_buf->mapped = NULL;
}

static void
xm_buffer_destroy(struct pipe_buffer *buf)
{
   struct xm_buffer *oldBuf = xm_buffer(buf);

   if (oldBuf->data) {
#ifdef USE_XSHM
      if (oldBuf->shminfo.shmid >= 0) {
         shmdt(oldBuf->shminfo.shmaddr);
         shmctl(oldBuf->shminfo.shmid, IPC_RMID, 0);
         
         oldBuf->shminfo.shmid = -1;
         oldBuf->shminfo.shmaddr = (char *) -1;
      }
      else
#endif
      {
         if (!oldBuf->userBuffer) {
            align_free(oldBuf->data);
         }
      }

      oldBuf->data = NULL;
   }

   free(oldBuf);
}


/**
 * Display/copy the image in the surface into the X window specified
 * by the XMesaBuffer.
 */
static void
xlib_softpipe_display_surface(struct xmesa_buffer *b,
                              struct pipe_surface *surf)
{
   XImage *ximage;
   struct softpipe_texture *spt = softpipe_texture(surf->texture);
   struct xm_buffer *xm_buf = xm_buffer(spt->buffer);
   static boolean no_swap = 0;
   static boolean firsttime = 1;

   if (firsttime) {
      no_swap = getenv("SP_NO_RAST") != NULL;
      firsttime = 0;
   }

   if (no_swap)
      return;

#ifdef USE_XSHM
   if (XSHM_ENABLED(xm_buf) && (xm_buf->tempImage == NULL)) {
      assert(surf->texture->block.width == 1);
      assert(surf->texture->block.height == 1);
      alloc_shm_ximage(xm_buf, b, spt->stride[surf->level] /
                       surf->texture->block.size, surf->height);
   }
#endif

   ximage = (XSHM_ENABLED(xm_buf)) ? xm_buf->tempImage : b->tempImage;
   ximage->data = xm_buf->data;

   /* display image in Window */
#ifdef USE_XSHM
   if (XSHM_ENABLED(xm_buf)) {
      XShmPutImage(b->xm_visual->display, b->drawable, b->gc,
                   ximage, 0, 0, 0, 0, surf->width, surf->height, False);
   } else
#endif
   {
      /* check that the XImage has been previously initialized */
      assert(ximage->format);
      assert(ximage->bitmap_unit);

      /* update XImage's fields */
      ximage->width = surf->width;
      ximage->height = surf->height;
      ximage->bytes_per_line = spt->stride[surf->level];

      XPutImage(b->xm_visual->display, b->drawable, b->gc,
                ximage, 0, 0, 0, 0, surf->width, surf->height);
   }
}


static void
xm_flush_frontbuffer(struct pipe_winsys *pws,
                     struct pipe_surface *surf,
                     void *context_private)
{
   /*
    * The front color buffer is actually just another XImage buffer.
    * This function copies that XImage to the actual X Window.
    */
   XMesaContext xmctx = (XMesaContext) context_private;
   xlib_softpipe_display_surface(xmctx->xm_buffer, surf);
}



static const char *
xm_get_name(struct pipe_winsys *pws)
{
   return "Xlib";
}


static struct pipe_buffer *
xm_buffer_create(struct pipe_winsys *pws, 
                 unsigned alignment, 
                 unsigned usage,
                 unsigned size)
{
   struct xm_buffer *buffer = CALLOC_STRUCT(xm_buffer);
#ifdef USE_XSHM
   struct xmesa_pipe_winsys *xpws = (struct xmesa_pipe_winsys *) pws;

   buffer->shminfo.shmid = -1;
   buffer->shminfo.shmaddr = (char *) -1;

   if (xpws->shm && (usage & PIPE_BUFFER_USAGE_PIXEL) != 0) {
      buffer->shm = xpws->shm;

      if (alloc_shm(buffer, size)) {
         buffer->data = buffer->shminfo.shmaddr;
         buffer->shm = 1;
      }
   }
#endif

   pipe_reference_init(&buffer->base.reference, 1);
   buffer->base.alignment = alignment;
   buffer->base.usage = usage;
   buffer->base.size = size;

   if (buffer->data == NULL) {
      /* align to 16-byte multiple for Cell */
      buffer->data = align_malloc(size, max(alignment, 16));
   }

   return &buffer->base;
}


/**
 * Create buffer which wraps user-space data.
 */
static struct pipe_buffer *
xm_user_buffer_create(struct pipe_winsys *pws, void *ptr, unsigned bytes)
{
   struct xm_buffer *buffer = CALLOC_STRUCT(xm_buffer);
   pipe_reference_init(&buffer->base.reference, 1);
   buffer->base.size = bytes;
   buffer->userBuffer = TRUE;
   buffer->data = ptr;
#ifdef USE_XSHM
   buffer->shm = 0;
#endif

   return &buffer->base;
}


static struct pipe_buffer *
xm_surface_buffer_create(struct pipe_winsys *winsys,
                         unsigned width, unsigned height,
                         enum pipe_format format,
                         unsigned usage,
                         unsigned tex_usage,
                         unsigned *stride)
{
   const unsigned alignment = 64;
   struct pipe_format_block block;
   unsigned nblocksx, nblocksy;

   pf_get_block(format, &block);
   nblocksx = pf_get_nblocksx(&block, width);
   nblocksy = pf_get_nblocksy(&block, height);
   *stride = align(nblocksx * block.size, alignment);

   return winsys->buffer_create(winsys, alignment,
                                usage,
                                *stride * nblocksy);
}


/*
 * Fence functions - basically nothing to do, as we don't create any actual
 * fence objects.
 */

static void
xm_fence_reference(struct pipe_winsys *sws, struct pipe_fence_handle **ptr,
                   struct pipe_fence_handle *fence)
{
}


static int
xm_fence_signalled(struct pipe_winsys *sws, struct pipe_fence_handle *fence,
                   unsigned flag)
{
   return 0;
}


static int
xm_fence_finish(struct pipe_winsys *sws, struct pipe_fence_handle *fence,
                unsigned flag)
{
   return 0;
}



static struct pipe_winsys *
xlib_create_softpipe_winsys( void )
{
   static struct xmesa_pipe_winsys *ws = NULL;

   if (!ws) {
      ws = CALLOC_STRUCT(xmesa_pipe_winsys);

      /* Fill in this struct with callbacks that pipe will need to
       * communicate with the window system, buffer manager, etc. 
       */
      ws->base.buffer_create = xm_buffer_create;
      ws->base.user_buffer_create = xm_user_buffer_create;
      ws->base.buffer_map = xm_buffer_map;
      ws->base.buffer_unmap = xm_buffer_unmap;
      ws->base.buffer_destroy = xm_buffer_destroy;

      ws->base.surface_buffer_create = xm_surface_buffer_create;

      ws->base.fence_reference = xm_fence_reference;
      ws->base.fence_signalled = xm_fence_signalled;
      ws->base.fence_finish = xm_fence_finish;

      ws->base.flush_frontbuffer = xm_flush_frontbuffer;
      ws->base.get_name = xm_get_name;
   }

   return &ws->base;
}


static struct pipe_screen *
xlib_create_softpipe_screen( void )
{
   struct pipe_winsys *winsys;
   struct pipe_screen *screen;

   winsys = xlib_create_softpipe_winsys();
   if (winsys == NULL)
      return NULL;

   screen = softpipe_create_screen(winsys);
   if (screen == NULL)
      goto fail;

   return screen;

fail:
   if (winsys)
      winsys->destroy( winsys );

   return NULL;
}


static struct pipe_context *
xlib_create_softpipe_context( struct pipe_screen *screen,
                              void *context_private )
{
   struct pipe_context *pipe;
   
   pipe = softpipe_create(screen);
   if (pipe == NULL)
      goto fail;

   pipe->priv = context_private;
   return pipe;

fail:
   /* Free stuff here */
   return NULL;
}

struct xm_driver xlib_softpipe_driver = 
{
   .create_pipe_screen = xlib_create_softpipe_screen,
   .create_pipe_context = xlib_create_softpipe_context,
   .display_surface = xlib_softpipe_display_surface
};