resourcebase.h

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#ifndef ION_GFX_RESOURCEBASE_H_
#define ION_GFX_RESOURCEBASE_H_

#include <stddef.h>
#include <cstdint>

namespace ion {
namespace gfx {

class ResourceHolder;

typedef intptr_t ResourceKey;

class ResourceBase {
 public:
  explicit ResourceBase(const ResourceHolder* holder, ResourceKey key)
      : holder_(holder),
        key_(key) {}
  virtual ~ResourceBase() {}

  const ResourceHolder* GetHolder() const { return holder_; }

  ResourceKey GetKey() const { return key_; }


  virtual void OnDestroyed() = 0;

  virtual void OnChanged(const int bit) = 0;

  virtual size_t GetGpuMemoryUsed() const = 0;

 private:
  const ResourceHolder* holder_;
  const ResourceKey key_;

  friend class ResourceHolder;
};

}  // namespace gfx
}  // namespace ion

#endif  // ION_GFX_RESOURCEBASE_H_