1/****************************************************************************
2 * Copyright (C) 2015 Intel Corporation.   All Rights Reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 ***************************************************************************/
23
24#include "pipe/p_screen.h"
25#include "util/u_memory.h"
26#include "os/os_time.h"
27
28#include "swr_context.h"
29#include "swr_screen.h"
30#include "swr_fence.h"
31
32#if defined(PIPE_CC_MSVC) // portable thread yield
33   #define sched_yield SwitchToThread
34#endif
35
36/*
37 * Fence callback, called by back-end thread on completion of all rendering up
38 * to SwrSync call.
39 */
40static void
41swr_fence_cb(uint64_t userData, uint64_t userData2, uint64_t userData3)
42{
43   struct swr_fence *fence = (struct swr_fence *)userData;
44
45   /* Complete all work attached to the fence */
46   swr_fence_do_work(fence);
47
48   /* Correct value is in SwrSync data, and not the fence write field. */
49   fence->read = userData2;
50}
51
52/*
53 * Submit an existing fence.
54 */
55void
56swr_fence_submit(struct swr_context *ctx, struct pipe_fence_handle *fh)
57{
58   struct swr_fence *fence = swr_fence(fh);
59
60   fence->write++;
61   fence->pending = TRUE;
62   SwrSync(ctx->swrContext, swr_fence_cb, (uint64_t)fence, fence->write, 0);
63}
64
65/*
66 * Create a new fence object.
67 */
68struct pipe_fence_handle *
69swr_fence_create()
70{
71   static int fence_id = 0;
72   struct swr_fence *fence = CALLOC_STRUCT(swr_fence);
73   if (!fence)
74      return NULL;
75
76   pipe_reference_init(&fence->reference, 1);
77   fence->id = fence_id++;
78   fence->work.tail = &fence->work.head;
79
80   return (struct pipe_fence_handle *)fence;
81}
82
83/** Destroy a fence.  Called when refcount hits zero. */
84static void
85swr_fence_destroy(struct swr_fence *fence)
86{
87   /* Complete any work left if fence was not submitted */
88   swr_fence_do_work(fence);
89   FREE(fence);
90}
91
92/**
93 * Set ptr = fence, with reference counting
94 */
95void
96swr_fence_reference(struct pipe_screen *screen,
97                    struct pipe_fence_handle **ptr,
98                    struct pipe_fence_handle *f)
99{
100   struct swr_fence *fence = swr_fence(f);
101   struct swr_fence *old;
102
103   if (likely(ptr)) {
104      old = swr_fence(*ptr);
105      *ptr = f;
106   } else {
107      old = NULL;
108   }
109
110   if (pipe_reference(&old->reference, &fence->reference)) {
111      swr_fence_finish(screen, NULL, (struct pipe_fence_handle *) old, 0);
112      swr_fence_destroy(old);
113   }
114}
115
116
117/*
118 * Wait for the fence to finish.
119 */
120boolean
121swr_fence_finish(struct pipe_screen *screen,
122                 struct pipe_context *ctx,
123                 struct pipe_fence_handle *fence_handle,
124                 uint64_t timeout)
125{
126   while (!swr_is_fence_done(fence_handle))
127      sched_yield();
128
129   swr_fence(fence_handle)->pending = FALSE;
130
131   return TRUE;
132}
133
134
135uint64_t
136swr_get_timestamp(struct pipe_screen *screen)
137{
138   return os_time_get_nano();
139}
140
141
142void
143swr_fence_init(struct pipe_screen *p_screen)
144{
145   p_screen->fence_reference = swr_fence_reference;
146   p_screen->fence_finish = swr_fence_finish;
147   p_screen->get_timestamp = swr_get_timestamp;
148
149   /* Create persistant StoreTiles "flush" fence, used to signal completion
150    * of flushing tile state back to resource texture, via StoreTiles. */
151   struct swr_screen *screen = swr_screen(p_screen);
152   screen->flush_fence = swr_fence_create();
153}
154