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/**
@file AreaMemoryManager.cpp
@maintainer Morgan McGuire, http://graphics.cs.williams.edu
@created 2009-01-20
@edited 2009-01-20
Copyright 2000-2009, Morgan McGuire.
All rights reserved.
*/
#include "G3D/AreaMemoryManager.h"
#include "G3D/System.h"
namespace G3D {
AreaMemoryManager::Buffer::Buffer(size_t size) : m_size(size), m_used(0) {
// Allocate space for a lot of buffers.
m_first = (uint8*)::malloc(m_size);
}
AreaMemoryManager::Buffer::~Buffer() {
::free(m_first);
}
void* AreaMemoryManager::Buffer::alloc(size_t s) {
if (s + m_used > m_size) {
return NULL;
} else {
void* old = m_first + m_used;
m_used += s;
return old;
}
}
bool AreaMemoryManager::isThreadsafe() const {
return false;
}
AreaMemoryManager::Ref AreaMemoryManager::create(size_t sizeHint) {
return new AreaMemoryManager(sizeHint);
}
AreaMemoryManager::AreaMemoryManager(size_t sizeHint) : m_sizeHint(sizeHint) {
debugAssert(sizeHint > 0);
}
AreaMemoryManager::~AreaMemoryManager() {
deallocateAll();
}
size_t AreaMemoryManager::bytesAllocated() const {
return m_sizeHint * m_bufferArray.size();
}
void* AreaMemoryManager::alloc(size_t s) {
void* n = (m_bufferArray.size() > 0) ? m_bufferArray.last()->alloc(s) : NULL;
if (n == NULL) {
// This buffer is full
m_bufferArray.append(new Buffer(max(s, m_sizeHint)));
return m_bufferArray.last()->alloc(s);
} else {
return n;
}
}
void AreaMemoryManager::free(void* x) {
// Intentionally empty; we block deallocate
}
void AreaMemoryManager::deallocateAll() {
m_bufferArray.deleteAll();
m_bufferArray.clear();
}
}
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