gzdoom/src/swrenderer/r_memory.h

#pragma once

#include <memory>
#include <vector>

// Memory needed for the duration of a frame rendering
class RenderMemory
{
public:
	void Clear();
		
	template<typename T>
	T *AllocMemory(int size = 1)
	{
		return (T*)AllocBytes(sizeof(T) * size);
	}
		
	template<typename T, typename... Types>
	T *NewObject(Types &&... args)
	{
		void *ptr = AllocBytes(sizeof(T));
		return new (ptr)T(std::forward<Types>(args)...);
	}
		
private:
	void *AllocBytes(int size);
		
	enum { BlockSize = 1024 * 1024 };
		
	struct MemoryBlock
	{
		MemoryBlock() : Data(new uint8_t[BlockSize]), Position(0) { }
		~MemoryBlock() { delete[] Data; }
			
		MemoryBlock(const MemoryBlock &) = delete;
		MemoryBlock &operator=(const MemoryBlock &) = delete;
			
		uint8_t *Data;
		uint32_t Position;
	};
	std::vector<std::unique_ptr<MemoryBlock>> UsedBlocks;
	std::vector<std::unique_ptr<MemoryBlock>> FreeBlocks;
};