+ void clear(BufferBits);
+ void blit_from(const Framebuffer &, int, int, int, int, int, int, int, int, BufferBits, bool);
+ void blit_from(const Framebuffer &, int, int, unsigned, unsigned, int, int, BufferBits);
+ void blit_from(const Framebuffer &, BufferBits, bool);
+
+ void bind() const;
+