pb_buffer_fenced.h revision 92fcbf6e7bc622dcace226bb70ff6d5cdbdbaecb
1/************************************************************************** 2 * 3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. 4 * All Rights Reserved. 5 * 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: 13 * 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. 17 * 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 TUNGSTEN GRAPHICS 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. 25 * 26 **************************************************************************/ 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 Jos� 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 57struct pipe_winsys; 58struct pipe_buffer; 59struct pipe_fence_handle; 60 61 62/** 63 * List of buffers which are awaiting fence signalling. 64 */ 65struct fenced_buffer_list; 66 67 68/** 69 * The fenced buffer's virtual function table. 70 * 71 * NOTE: Made public for debugging purposes. 72 */ 73extern const struct pb_vtbl fenced_buffer_vtbl; 74 75 76/** 77 * Create a fenced buffer list. 78 * 79 * See also fenced_bufmgr_create for a more convenient way to use this. 80 */ 81struct fenced_buffer_list * 82fenced_buffer_list_create(struct pipe_winsys *winsys); 83 84 85/** 86 * Walk the fenced buffer list to check and free signalled buffers. 87 */ 88void 89fenced_buffer_list_check_free(struct fenced_buffer_list *fenced_list, 90 int wait); 91 92void 93fenced_buffer_list_destroy(struct fenced_buffer_list *fenced_list); 94 95 96/** 97 * Wrap a buffer in a fenced buffer. 98 * 99 * NOTE: this will not increase the buffer reference count. 100 */ 101struct pb_buffer * 102fenced_buffer_create(struct fenced_buffer_list *fenced, 103 struct pb_buffer *buffer); 104 105 106/** 107 * Set a buffer's fence. 108 * 109 * NOTE: Although it takes a generic pb_buffer argument, it will fail 110 * on everything but buffers returned by fenced_buffer_create. 111 */ 112void 113buffer_fence(struct pb_buffer *buf, 114 struct pipe_fence_handle *fence); 115 116 117#endif /*PB_BUFFER_FENCED_H_*/ 118