SDL3pp_metal.h

#ifndef SDL3PP_METAL_H_
#define SDL3PP_METAL_H_
 
#include <SDL3/SDL_metal.h>
#include "SDL3pp_video.h"
 
namespace SDL {
 
// Forward decl
struct MetalView;
 
using MetalViewRaw = SDL_MetalView;
 
// Forward decl
struct MetalViewRef;
 
struct MetalViewParam
{
  MetalViewRaw value; 
 
  constexpr MetalViewParam(MetalViewRaw value)
    : value(value)
  {
  }
 
  constexpr MetalViewParam(std::nullptr_t _ = nullptr)
    : value(0)
  {
  }
 
  constexpr explicit operator bool() const { return !!value; }
 
  constexpr auto operator<=>(const MetalViewParam& other) const = default;
 
  constexpr operator MetalViewRaw() const { return value; }
};
 
class MetalView
{
  MetalViewRaw m_resource = 0;
 
public:
  constexpr MetalView() = default;
 
  constexpr explicit MetalView(const MetalViewRaw resource)
    : m_resource(resource)
  {
  }
 
  constexpr MetalView(const MetalView& other) = delete;
 
  constexpr MetalView(MetalView&& other)
    : MetalView(other.release())
  {
  }
 
  constexpr MetalView(const MetalViewRef& other) = delete;
 
  constexpr MetalView(MetalViewRef&& other) = delete;
 
  MetalView(WindowParam window)
    : m_resource(SDL_Metal_CreateView(window))
  {
  }
 
  ~MetalView() { SDL_Metal_DestroyView(m_resource); }
 
  MetalView& operator=(MetalView other)
  {
    std::swap(m_resource, other.m_resource);
    return *this;
  }
 
  constexpr MetalViewRaw get() const { return m_resource; }
 
  constexpr MetalViewRaw release()
  {
    auto r = m_resource;
    m_resource = 0;
    return r;
  }
 
  constexpr auto operator<=>(const MetalView& other) const = default;
 
  constexpr bool operator==(std::nullptr_t _) const { return !m_resource; }
 
  constexpr explicit operator bool() const { return !!m_resource; }
 
  constexpr operator MetalViewParam() const { return {m_resource}; }
 
  void Destroy();
 
  void* GetLayer();
};
 
struct MetalViewRef : MetalView
{
  MetalViewRef(MetalViewParam resource)
    : MetalView(resource.value)
  {
  }
 
  MetalViewRef(const MetalViewRef& other)
    : MetalView(other.get())
  {
  }
 
  ~MetalViewRef() { release(); }
};
 
inline MetalView Metal_CreateView(WindowParam window)
{
  return MetalView(window);
}
 
inline void Metal_DestroyView(MetalViewRaw view)
{
  SDL_Metal_DestroyView(view);
}
 
inline void MetalView::Destroy() { SDL::Metal_DestroyView(release()); }
 
inline void* Metal_GetLayer(MetalViewParam view)
{
  return SDL_Metal_GetLayer(view);
}
 
inline void* MetalView::GetLayer() { return SDL::Metal_GetLayer(m_resource); }
 
 
} // namespace SDL
 
#endif /* SDL3PP_METAL_H_ */