src/gallium/auxiliary/pipebuffer/pb_buffer_malloc.c

   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  * Implementation of malloc-based buffers to store data that can't be processed
  31  * by the hardware.
  32  *
  33  * \author Jose Fonseca <jrfonseca@tungstengraphics.com>
  34  */
  35
  36
  37 #include "pipe/p_debug.h"
  38 #include "util/u_memory.h"
  39 #include "pb_buffer.h"
  40 #include "pb_bufmgr.h"
  41
  42
  43 struct malloc_buffer
  44 {
  45    struct pb_buffer base;
  46    void *data;
  47 };
  48
  49
  50 extern const struct pb_vtbl malloc_buffer_vtbl;
  51
  52 static INLINE struct malloc_buffer *
  53 malloc_buffer(struct pb_buffer *buf)
  54 {
  55    assert(buf);
  56    assert(buf->vtbl == &malloc_buffer_vtbl);
  57    return (struct malloc_buffer *)buf;
  58 }
  59
  60
  61 static void
  62 malloc_buffer_destroy(struct pb_buffer *buf)
  63 {
  64    align_free(malloc_buffer(buf)->data);
  65    FREE(buf);
  66 }
  67
  68
  69 static void *
  70 malloc_buffer_map(struct pb_buffer *buf,
  71                   unsigned flags)
  72 {
  73    return malloc_buffer(buf)->data;
  74 }
  75
  76
  77 static void
  78 malloc_buffer_unmap(struct pb_buffer *buf)
  79 {
  80    /* No-op */
  81 }
  82
  83
  84 static void
  85 malloc_buffer_get_base_buffer(struct pb_buffer *buf,
  86                               struct pb_buffer **base_buf,
  87                               unsigned *offset)
  88 {
  89    *base_buf = buf;
  90    *offset = 0;
  91 }
  92
  93
  94 const struct pb_vtbl
  95 malloc_buffer_vtbl = {
  96       malloc_buffer_destroy,
  97       malloc_buffer_map,
  98       malloc_buffer_unmap,
  99       malloc_buffer_get_base_buffer
 100 };
 101
 102
 103 struct pb_buffer *
 104 pb_malloc_buffer_create(size_t size,
 105                         const struct pb_desc *desc)
 106 {
 107    struct malloc_buffer *buf;
 108
 109    /* TODO: do a single allocation */
 110
 111    buf = CALLOC_STRUCT(malloc_buffer);
 112    if(!buf)
 113       return NULL;
 114
 115    buf->base.base.refcount = 1;
 116    buf->base.base.alignment = desc->alignment;
 117    buf->base.base.usage = desc->usage;
 118    buf->base.base.size = size;
 119    buf->base.vtbl = &malloc_buffer_vtbl;
 120
 121    buf->data = align_malloc(size, desc->alignment < sizeof(void*) ? sizeof(void*) : desc->alignment);
 122    if(!buf->data) {
 123       FREE(buf);
 124       return NULL;
 125    }
 126
 127    return &buf->base;
 128 }
 129
 130
 131 static struct pb_buffer *
 132 pb_malloc_bufmgr_create_buffer(struct pb_manager *mgr,
 133                                size_t size,
 134                                const struct pb_desc *desc)
 135 {
 136    return pb_malloc_buffer_create(size, desc);
 137 }
 138
 139
 140 static void
 141 pb_malloc_bufmgr_flush(struct pb_manager *mgr)
 142 {
 143    /* No-op */
 144 }
 145
 146
 147 static void
 148 pb_malloc_bufmgr_destroy(struct pb_manager *mgr)
 149 {
 150    /* No-op */
 151 }
 152
 153
 154 static struct pb_manager
 155 pb_malloc_bufmgr = {
 156    pb_malloc_bufmgr_destroy,
 157    pb_malloc_bufmgr_create_buffer,
 158    pb_malloc_bufmgr_flush
 159 };
 160
 161
 162 struct pb_manager *
 163 pb_malloc_bufmgr_create(void)
 164 {
 165   return &pb_malloc_bufmgr;
 166 }