src/mesa/pipe/pipebuffer/pb_bufmgr_fenced.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA
   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 SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  18  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  19  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  20  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * The above copyright notice and this permission notice (including the
  23  * next paragraph) shall be included in all copies or substantial portions
  24  * of the Software.
  25  *
  26  *
  27  **************************************************************************/
  28
  29 /**
  30  * \file
  31  * A buffer manager that wraps buffers in fenced buffers.
  32  *
  33  * \author José Fonseca <jrfonseca@tungstengraphics.dot.com>
  34  */
  35
  36
  37 #include <assert.h>
  38 #include <stdlib.h>
  39
  40 #include "p_util.h"
  41
  42 #include "pb_buffer.h"
  43 #include "pb_buffer_fenced.h"
  44 #include "pb_bufmgr.h"
  45
  46
  47 struct fenced_pb_manager
  48 {
  49    struct pb_manager base;
  50
  51    struct pb_manager *provider;
  52
  53    struct fenced_buffer_list *fenced_list;
  54 };
  55
  56
  57 static INLINE struct fenced_pb_manager *
  58 fenced_pb_manager(struct pb_manager *mgr)
  59 {
  60    assert(mgr);
  61    return (struct fenced_pb_manager *)mgr;
  62 }
  63
  64
  65 static struct pb_buffer *
  66 fenced_bufmgr_create_buffer(struct pb_manager *mgr,
  67                             size_t size,
  68                             const struct pb_desc *desc)
  69 {
  70    struct fenced_pb_manager *fenced_mgr = fenced_pb_manager(mgr);
  71    struct pb_buffer *buf;
  72    struct pb_buffer *fenced_buf;
  73
  74    /* check for free buffers before allocating new ones */
  75    fenced_buffer_list_check_free(fenced_mgr->fenced_list, 0);
  76
  77    buf = fenced_mgr->provider->create_buffer(fenced_mgr->provider, size, desc);
  78    if(!buf) {
  79       /* try harder to get a buffer */
  80       fenced_buffer_list_check_free(fenced_mgr->fenced_list, 1);
  81
  82       buf = fenced_mgr->provider->create_buffer(fenced_mgr->provider, size, desc);
  83       if(!buf) {
  84          /* give up */
  85          return NULL;
  86       }
  87    }
  88
  89    fenced_buf = fenced_buffer_create(fenced_mgr->fenced_list, buf);
  90    if(!fenced_buf) {
  91       assert(buf->base.refcount == 1);
  92       pb_destroy(buf);
  93    }
  94
  95    return fenced_buf;
  96 }
  97
  98
  99 static void
 100 fenced_bufmgr_destroy(struct pb_manager *mgr)
 101 {
 102    struct fenced_pb_manager *fenced_mgr = fenced_pb_manager(mgr);
 103
 104    fenced_buffer_list_destroy(fenced_mgr->fenced_list);
 105
 106    fenced_mgr->provider->destroy(fenced_mgr->provider);
 107
 108    FREE(fenced_mgr);
 109 }
 110
 111
 112 struct pb_manager *
 113 fenced_bufmgr_create(struct pb_manager *provider,
 114                      struct pipe_winsys *winsys)
 115 {
 116    struct fenced_pb_manager *fenced_mgr;
 117
 118    fenced_mgr = (struct fenced_pb_manager *)CALLOC(1, sizeof(*fenced_mgr));
 119    if (!fenced_mgr)
 120       return NULL;
 121
 122    fenced_mgr->base.destroy = fenced_bufmgr_destroy;
 123    fenced_mgr->base.create_buffer = fenced_bufmgr_create_buffer;
 124
 125    fenced_mgr->provider = provider;
 126    fenced_mgr->fenced_list = fenced_buffer_list_create(winsys);
 127    if(!fenced_mgr->fenced_list) {
 128       FREE(fenced_mgr);
 129       return NULL;
 130    }
 131
 132    return &fenced_mgr->base;
 133 }