src/gallium/drivers/swr/swr_fence.cpp

   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  * Fence callback, called by back-end thread on completion of all rendering up
  37  * to SwrSync call.
  38  */
  39 static void
  40 swr_sync_cb(UINT64 userData, UINT64 userData2, UINT64 userData3)
  41 {
  42    struct swr_fence *fence = (struct swr_fence *)userData;
  43
  44    fence->read = fence->write;
  45 }
  46
  47 /*
  48  * Submit an existing fence.
  49  */
  50 void
  51 swr_fence_submit(struct swr_context *ctx, struct pipe_fence_handle *fh)
  52 {
  53    struct swr_fence *fence = swr_fence(fh);
  54
  55    fence->write++;
  56    SwrSync(ctx->swrContext, swr_sync_cb, (UINT64)fence, 0, 0);
  57 }
  58
  59 /*
  60  * Create a new fence object.
  61  */
  62 struct pipe_fence_handle *
  63 swr_fence_create()
  64 {
  65    static int fence_id = 0;
  66    struct swr_fence *fence = CALLOC_STRUCT(swr_fence);
  67    if (!fence)
  68       return NULL;
  69
  70    memset(fence, 0, sizeof(*fence));
  71    pipe_reference_init(&fence->reference, 1);
  72    fence->id = fence_id++;
  73
  74    return (struct pipe_fence_handle *)fence;
  75 }
  76
  77 /** Destroy a fence.  Called when refcount hits zero. */
  78 static void
  79 swr_fence_destroy(struct swr_fence *fence)
  80 {
  81    FREE(fence);
  82 }
  83
  84 /**
  85  * Set ptr = fence, with reference counting
  86  */
  87 void
  88 swr_fence_reference(struct pipe_screen *screen,
  89                     struct pipe_fence_handle **ptr,
  90                     struct pipe_fence_handle *f)
  91 {
  92    struct swr_fence *fence = swr_fence(f);
  93    struct swr_fence *old;
  94
  95    if (likely(ptr)) {
  96       old = swr_fence(*ptr);
  97       *ptr = f;
  98    } else {
  99       old = NULL;
 100    }
 101
 102    if (pipe_reference(&old->reference, &fence->reference))
 103       swr_fence_destroy(old);
 104 }
 105
 106 /*
 107  * Wait for the fence to finish.
 108  */
 109 boolean
 110 swr_fence_finish(struct pipe_screen *screen,
 111                  struct pipe_fence_handle *fence_handle,
 112                  uint64_t timeout)
 113 {
 114    struct swr_fence *fence = swr_fence(fence_handle);
 115
 116    while (!swr_is_fence_done(fence))
 117       sched_yield();
 118
 119    return TRUE;
 120 }
 121
 122
 123 uint64_t
 124 swr_get_timestamp(struct pipe_screen *screen)
 125 {
 126    return os_time_get_nano();
 127 }
 128
 129
 130 void
 131 swr_fence_init(struct pipe_screen *p_screen)
 132 {
 133    p_screen->fence_reference = swr_fence_reference;
 134    p_screen->fence_finish = swr_fence_finish;
 135
 136    p_screen->get_timestamp = swr_get_timestamp;
 137
 138    /*
 139     * Create persistant "flush" fence, submitted when swr_flush is called.
 140     */
 141    struct swr_screen *screen = swr_screen(p_screen);
 142    screen->flush_fence = swr_fence_create();
 143 }