workbench/libs/mesa/src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
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  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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  27
  28 /**
  29  * \file
  30  * Buffer fencing.
  31  *
  32  * "Fenced buffers" is actually a misnomer. They should be referred as
  33  * "fenceable buffers", i.e, buffers that can be fenced, but I couldn't find
  34  * the word "fenceable" in the dictionary.
  35  *
  36  * A "fenced buffer" is a decorator around a normal buffer, which adds two
  37  * special properties:
  38  * - the ability for the destruction to be delayed by a fence;
  39  * - reference counting.
  40  *
  41  * Usually DMA buffers have a life-time that will extend the life-time of its
  42  * handle. The end-of-life is dictated by the fence signalling.
  43  *
  44  * Between the handle's destruction, and the fence signalling, the buffer is
  45  * stored in a fenced buffer list.
  46  *
  47  * \author Jose Fonseca <jrfonseca@tungstengraphics.com>
  48  */
  49
  50 #ifndef PB_BUFFER_FENCED_H_
  51 #define PB_BUFFER_FENCED_H_
  52
  53
  54 #include "util/u_debug.h"
  55
  56
  57 #ifdef __cplusplus
  58 extern "C" {
  59 #endif
  60
  61
  62 struct pipe_fence_handle;
  63
  64
  65 /**
  66  * List of buffers which are awaiting fence signalling.
  67  */
  68 struct fenced_buffer_list;
  69
  70
  71 struct pb_fence_ops
  72 {
  73    void (*destroy)( struct pb_fence_ops *ops );
  74
  75    /** Set ptr = fence, with reference counting */
  76    void (*fence_reference)( struct pb_fence_ops *ops,
  77                             struct pipe_fence_handle **ptr,
  78                             struct pipe_fence_handle *fence );
  79
  80    /**
  81     * Checks whether the fence has been signalled.
  82     * \param flags  driver-specific meaning
  83     * \return zero on success.
  84     */
  85    int (*fence_signalled)( struct pb_fence_ops *ops,
  86                            struct pipe_fence_handle *fence,
  87                            unsigned flag );
  88
  89    /**
  90     * Wait for the fence to finish.
  91     * \param flags  driver-specific meaning
  92     * \return zero on success.
  93     */
  94    int (*fence_finish)( struct pb_fence_ops *ops,
  95                         struct pipe_fence_handle *fence,
  96                         unsigned flag );
  97 };
  98
  99
 100 #ifdef __cplusplus
 101 }
 102 #endif
 103
 104 #endif /*PB_BUFFER_FENCED_H_*/