dolphin/Source/Core/VideoBackends/OGL/SamplerCache.h

// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#pragma once

#include <map>
#include <memory>

#include "Common/CommonTypes.h"
#include "Common/GL/GLUtil.h"
#include "Common/NonCopyable.h"
#include "VideoBackends/OGL/Render.h"

namespace OGL
{
class SamplerCache : NonCopyable
{
public:
  SamplerCache();
  ~SamplerCache();

  void SetSamplerState(int stage, const TexMode0& tm0, const TexMode1& tm1, bool custom_tex);
  void Clear();
  void BindNearestSampler(int stage);
  void BindLinearSampler(int stage);

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;
  u32 m_sampler_id[2];
};

extern std::unique_ptr<SamplerCache> g_sampler_cache;
}