1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
29 #include "pipe/p_screen.h"
30 #include "util/u_memory.h"
31 #include "util/u_inlines.h"
37 * Create a new fence object.
39 * The rank will be the number of bins in the scene. Whenever a rendering
40 * thread hits a fence command, it'll increment the fence counter. When
41 * the counter == the rank, the fence is finished.
43 * \param rank the expected finished value of the fence counter.
46 lp_fence_create(unsigned rank
)
48 struct lp_fence
*fence
= CALLOC_STRUCT(lp_fence
);
50 pipe_reference_init(&fence
->reference
, 1);
52 pipe_mutex_init(fence
->mutex
);
53 pipe_condvar_init(fence
->signalled
);
61 /** Destroy a fence. Called when refcount hits zero. */
63 lp_fence_destroy(struct lp_fence
*fence
)
65 pipe_mutex_destroy(fence
->mutex
);
66 pipe_condvar_destroy(fence
->signalled
);
72 * For reference counting.
73 * This is a Gallium API function.
76 llvmpipe_fence_reference(struct pipe_screen
*screen
,
77 struct pipe_fence_handle
**ptr
,
78 struct pipe_fence_handle
*fence
)
80 struct lp_fence
*old
= (struct lp_fence
*) *ptr
;
81 struct lp_fence
*f
= (struct lp_fence
*) fence
;
83 if (pipe_reference(&old
->reference
, &f
->reference
)) {
84 lp_fence_destroy(old
);
90 * Has the fence been executed/finished?
91 * This is a Gallium API function.
94 llvmpipe_fence_signalled(struct pipe_screen
*screen
,
95 struct pipe_fence_handle
*fence
,
98 struct lp_fence
*f
= (struct lp_fence
*) fence
;
100 return f
->count
== f
->rank
;
105 * Wait for the fence to finish.
106 * This is a Gallium API function.
109 llvmpipe_fence_finish(struct pipe_screen
*screen
,
110 struct pipe_fence_handle
*fence_handle
,
113 struct lp_fence
*fence
= (struct lp_fence
*) fence_handle
;
115 pipe_mutex_lock(fence
->mutex
);
116 while (fence
->count
< fence
->rank
) {
117 pipe_condvar_wait(fence
->signalled
, fence
->mutex
);
119 pipe_mutex_unlock(fence
->mutex
);
126 * Called by the rendering threads to increment the fence counter.
127 * When the counter == the rank, the fence is finished.
130 lp_fence_signal(struct lp_fence
*fence
)
132 pipe_mutex_lock(fence
->mutex
);
135 assert(fence
->count
<= fence
->rank
);
137 LP_DBG(DEBUG_RAST
, "%s count=%u rank=%u\n", __FUNCTION__
,
138 fence
->count
, fence
->rank
);
140 pipe_condvar_signal(fence
->signalled
);
142 pipe_mutex_unlock(fence
->mutex
);
147 llvmpipe_init_screen_fence_funcs(struct pipe_screen
*screen
)
149 screen
->fence_reference
= llvmpipe_fence_reference
;
150 screen
->fence_signalled
= llvmpipe_fence_signalled
;
151 screen
->fence_finish
= llvmpipe_fence_finish
;