Reference IOpenGLContext

  IOpenGLContext = interface
  public
    function GetCanRender: Boolean;
    procedure SetCanRender(const Value: Boolean);
    function GetCurrent: Boolean;
    procedure SetCurrent(const Value: Boolean);
    function GetVSync: Boolean;
    procedure SetVSync(const Value: Boolean);
    { Calling GetSize returns the size in pixels of the rendering area }
    procedure GetSize(out Width, Height: Integer);
    { Calling Flip switched the fore and back rendering buffers }
    procedure Flip;
    { MakeCurrent is another way to set the context current to True or False }
    procedure MakeCurrent(Value: Boolean);
    { Lock exclusive access for the calling thread }
    procedure Lock;
    { Unlock exclusive access for the calling thread }
    procedure Unlock;
    { CanRender is set to True when a context is ready and is set set to False
      when starting up or shutting down }
    property CanRender: Boolean read GetCanRender write SetCanRender;
    { Current can be used to control if a context current for a thread }
    property Current: Boolean read GetCurrent write SetCurrent;
    { When VSync is True calls to Flip wait for vertical sync before returning }
    property VSync: Boolean read GetVSync write SetVSync;
  end;