src/gallium/aux/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 José Fonseca <jrfonseca@tungstengraphics.com>
  34  */
  35
  36
  37 #include "pipe/p_debug.h"
  38 #include "pipe/p_util.h"
  39 #include "pb_buffer.h"
  40
  41
  42 struct malloc_buffer
  43 {
  44    struct pb_buffer base;
  45    void *data;
  46 };
  47
  48
  49 extern const struct pb_vtbl malloc_buffer_vtbl;
  50
  51 static INLINE struct malloc_buffer *
  52 malloc_buffer(struct pb_buffer *buf)
  53 {
  54    assert(buf);
  55    assert(buf->vtbl == &malloc_buffer_vtbl);
  56    return (struct malloc_buffer *)buf;
  57 }
  58
  59
  60 static void
  61 malloc_buffer_destroy(struct pb_buffer *buf)
  62 {
  63    align_free(malloc_buffer(buf)->data);
  64    FREE(buf);
  65 }
  66
  67
  68 static void *
  69 malloc_buffer_map(struct pb_buffer *buf,
  70                   unsigned flags)
  71 {
  72    return malloc_buffer(buf)->data;
  73 }
  74
  75
  76 static void
  77 malloc_buffer_unmap(struct pb_buffer *buf)
  78 {
  79    /* No-op */
  80 }
  81
  82
  83 static void
  84 malloc_buffer_get_base_buffer(struct pb_buffer *buf,
  85                               struct pb_buffer **base_buf,
  86                               unsigned *offset)
  87 {
  88    *base_buf = buf;
  89    *offset = 0;
  90 }
  91
  92
  93 const struct pb_vtbl
  94 malloc_buffer_vtbl = {
  95       malloc_buffer_destroy,
  96       malloc_buffer_map,
  97       malloc_buffer_unmap,
  98       malloc_buffer_get_base_buffer
  99 };
 100
 101
 102 struct pb_buffer *
 103 pb_malloc_buffer_create(size_t size,
 104                         const struct pb_desc *desc)
 105 {
 106    struct malloc_buffer *buf;
 107
 108    /* TODO: do a single allocation */
 109
 110    buf = CALLOC_STRUCT(malloc_buffer);
 111    if(!buf)
 112       return NULL;
 113
 114    buf->base.base.refcount = 1;
 115    buf->base.base.alignment = desc->alignment;
 116    buf->base.base.usage = desc->usage;
 117    buf->base.base.size = size;
 118    buf->base.vtbl = &malloc_buffer_vtbl;
 119
 120    buf->data = align_malloc(size, desc->alignment < sizeof(void*) ? sizeof(void*) : desc->alignment);
 121    if(!buf->data) {
 122       align_free(buf);
 123       return NULL;
 124    }
 125
 126    return &buf->base;
 127 }