d2BlockAllocator.h

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// MIT License
 
// Copyright (c) 2019 Erin Catto
 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
 
#ifndef D2BLOCKALLOCATOR_H
#define D2BLOCKALLOCATOR_H
 
#include "dura2d/d2api.h"
#include "dura2d/d2Types.h"
 
// Allocation sizes
constexpr int d2_blockSizeCount = 14;
 
// Forward declarations
struct d2Block;
struct d2Chunk;
 
class D2_API d2BlockAllocator
{
public:
    d2BlockAllocator();
 
    ~d2BlockAllocator();
 
    void* Allocate(int32 size);
 
    void Free(void* p, int32 size);
 
    void Clear();
 
private:
    d2Chunk* m_chunks {nullptr};
 
    int m_chunkCount {0};
 
    int m_chunkSpacing {0};
 
    d2Block* m_freeLists[d2_blockSizeCount] {nullptr};
};
 
#endif //D2BLOCKALLOCATOR_H