Reference TColorVertexBuffer

  TColorVertexBuffer = class(TDrawingBuffer<TColorVertex>)
  protected
    function CountAttributes: Integer; override;
    procedure BindAttributes; override;
  public
    { Add a vertex, returning the buffer so calls can be chained }
    function Add(const V: TVec3; const C: TVec4): TColorVertexBuffer; overload;
    function Add(X, Y, Z, R, G, B, A: Float): TColorVertexBuffer; overload;
  end;