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      1 /**************************************************************************
      2  *
      3  * Copyright 2007-2008 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  * Allocate buffers from two alternative buffer providers.
     31  *
     32  * \author Jose Fonseca <jrfonseca (at) tungstengraphics.com>
     33  */
     34 
     35 
     36 #include "pipe/p_compiler.h"
     37 #include "util/u_debug.h"
     38 #include "util/u_memory.h"
     39 
     40 #include "pb_buffer.h"
     41 #include "pb_bufmgr.h"
     42 
     43 
     44 struct pb_alt_manager
     45 {
     46    struct pb_manager base;
     47 
     48    struct pb_manager *provider1;
     49    struct pb_manager *provider2;
     50 };
     51 
     52 
     53 static INLINE struct pb_alt_manager *
     54 pb_alt_manager(struct pb_manager *mgr)
     55 {
     56    assert(mgr);
     57    return (struct pb_alt_manager *)mgr;
     58 }
     59 
     60 
     61 static struct pb_buffer *
     62 pb_alt_manager_create_buffer(struct pb_manager *_mgr,
     63                              pb_size size,
     64                              const struct pb_desc *desc)
     65 {
     66    struct pb_alt_manager *mgr = pb_alt_manager(_mgr);
     67    struct pb_buffer *buf;
     68 
     69    buf = mgr->provider1->create_buffer(mgr->provider1, size, desc);
     70    if(buf)
     71       return buf;
     72 
     73    buf = mgr->provider2->create_buffer(mgr->provider2, size, desc);
     74    return buf;
     75 }
     76 
     77 
     78 static void
     79 pb_alt_manager_flush(struct pb_manager *_mgr)
     80 {
     81    struct pb_alt_manager *mgr = pb_alt_manager(_mgr);
     82 
     83    assert(mgr->provider1->flush);
     84    if(mgr->provider1->flush)
     85       mgr->provider1->flush(mgr->provider1);
     86 
     87    assert(mgr->provider2->flush);
     88    if(mgr->provider2->flush)
     89       mgr->provider2->flush(mgr->provider2);
     90 }
     91 
     92 
     93 static void
     94 pb_alt_manager_destroy(struct pb_manager *mgr)
     95 {
     96    FREE(mgr);
     97 }
     98 
     99 
    100 struct pb_manager *
    101 pb_alt_manager_create(struct pb_manager *provider1,
    102                       struct pb_manager *provider2)
    103 {
    104    struct pb_alt_manager *mgr;
    105 
    106    if(!provider1 || !provider2)
    107       return NULL;
    108 
    109    mgr = CALLOC_STRUCT(pb_alt_manager);
    110    if (!mgr)
    111       return NULL;
    112 
    113    mgr->base.destroy = pb_alt_manager_destroy;
    114    mgr->base.create_buffer = pb_alt_manager_create_buffer;
    115    mgr->base.flush = pb_alt_manager_flush;
    116    mgr->provider1 = provider1;
    117    mgr->provider2 = provider2;
    118 
    119    return &mgr->base;
    120 }
    121