dolphin/Source/Plugins/Plugin_VideoOGL/Src/SamplerCache.h

#ifndef INCLUDE_SAMPLER_CACHE_H_
#define INCLUDE_SAMPLER_CACHE_H_

#include <map>

#include "Render.h"
#include "GLUtil.h"

namespace OGL
{

class SamplerCache : NonCopyable
{
public:
	SamplerCache();
	~SamplerCache();
	
	void SetSamplerState(int stage, const TexMode0& tm0, const TexMode1& tm1);
	void Clear();
	
private:
	struct Params
	{
		union
		{
			struct
			{
				TexMode0 tm0;
				TexMode1 tm1;
			};
			
			u64 hex;
		};
		
		Params()
			: hex()
		{}
		
		Params(const TexMode0& _tm0, const TexMode1& _tm1)
			: tm0(_tm0)
			, tm1(_tm1)
		{
			static_assert(sizeof(Params) == 8, "Assuming I can treat this as a 64bit int.");
		}
		
		bool operator<(const Params& other) const
		{
			return hex < other.hex;
		}
		
		bool operator!=(const Params& other) const
		{
			return hex != other.hex;
		}
	};
	
	struct Value
	{
		Value()
			: sampler_id()
		{}
		
		GLuint sampler_id;
	};
	
	void SetParameters(GLuint sampler_id, const Params& params);
	Value& GetEntry(const Params& params);

	std::map<Params, Value> m_cache;
	std::pair<Params, Value> m_active_samplers[8];
	
	int m_last_max_anisotropy;
};

}

#endif