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
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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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 José Fonseca <jrfonseca@tungstengraphics.com>
  48  */
  49
  50 #ifndef PB_BUFFER_FENCED_H_
  51 #define PB_BUFFER_FENCED_H_
  52
  53
  54 #include "pipe/p_debug.h"
  55
  56
  57 #ifdef __cplusplus
  58 extern "C" {
  59 #endif
  60
  61
  62 struct pipe_winsys;
  63 struct pipe_buffer;
  64 struct pipe_fence_handle;
  65
  66
  67 /**
  68  * List of buffers which are awaiting fence signalling.
  69  */
  70 struct fenced_buffer_list;
  71
  72
  73 /**
  74  * The fenced buffer's virtual function table.
  75  *
  76  * NOTE: Made public for debugging purposes.
  77  */
  78 extern const struct pb_vtbl fenced_buffer_vtbl;
  79
  80
  81 /**
  82  * Create a fenced buffer list.
  83  *
  84  * See also fenced_bufmgr_create for a more convenient way to use this.
  85  */
  86 struct fenced_buffer_list *
  87 fenced_buffer_list_create(struct pipe_winsys *winsys);
  88
  89
  90 /**
  91  * Walk the fenced buffer list to check and free signalled buffers.
  92  */
  93 void
  94 fenced_buffer_list_check_free(struct fenced_buffer_list *fenced_list,
  95                               int wait);
  96
  97 void
  98 fenced_buffer_list_destroy(struct fenced_buffer_list *fenced_list);
  99
 100
 101 /**
 102  * Wrap a buffer in a fenced buffer.
 103  *
 104  * NOTE: this will not increase the buffer reference count.
 105  */
 106 struct pb_buffer *
 107 fenced_buffer_create(struct fenced_buffer_list *fenced,
 108                      struct pb_buffer *buffer);
 109
 110
 111 /**
 112  * Set a buffer's fence.
 113  *
 114  * NOTE: Although it takes a generic pb_buffer argument, it will fail
 115  * on everything but buffers returned by fenced_buffer_create.
 116  */
 117 void
 118 buffer_fence(struct pb_buffer *buf,
 119              struct pipe_fence_handle *fence);
 120
 121
 122 #ifdef __cplusplus
 123 }
 124 #endif
 125
 126 #endif /*PB_BUFFER_FENCED_H_*/