blender/intern/cycles/util/util_memarena.cpp

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/*
* Copyright 2011, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "util_foreach.h"
#include "util_math.h"
#include "util_memarena.h"
CCL_NAMESPACE_BEGIN
MemArena::MemArena(bool use_calloc_, size_t buffer_size_)
{
use_calloc = use_calloc_;
buffer_size = buffer_size_;
last_left = 0;
last_buffer = NULL;
}
MemArena::~MemArena()
{
foreach(uint8_t *buffer, buffers)
delete [] buffer;
}
void *MemArena::alloc(size_t size)
{
if(size > last_left) {
last_left = (size > buffer_size)? size: buffer_size;
last_buffer = new uint8_t[last_left];
if(use_calloc)
memset(last_buffer, 0, last_left);
buffers.push_back(last_buffer);
}
uint8_t *mem = last_buffer;
last_buffer += size;
last_left -= size;
return (void*)mem;
}
CCL_NAMESPACE_END