+ /** Sets depth texture comparison. Has no effect on other formats. When
+ comparison is enabled, the third component of the texture coordinate is
+ compared against the texel value, and the result is returned as the texture
+ sample. */
+ void set_compare_enabled(bool);
+
+ /** Sets the function to use for depth comparison. */
+ void set_compare_func(Predicate);
+
+ /// Loads a Graphics::Image from a file and uploads it to the texture.
+ virtual void load_image(const std::string &, bool srgb = false);
+
+ /** Uploads an image to the texture. If storage has not been defined, it
+ will be set to match the image. Otherwise the image must be compatible
+ with the defined storage. Semantics depend on the type of texture.
+
+ If srgb is true and storage is determined by this call, then an sRGB pixel
+ format will be used. */
+ virtual void image(const Graphics::Image &, bool srgb = false) = 0;
+
+ GLenum get_target() const { return target; }
+ unsigned get_id() const { return id; }
+
+ void bind() const { bind_to(0); }
+ void bind_to(unsigned) const;
+
+ static const Texture *current(unsigned = 0);
+ static void unbind() { unbind_from(0); }
+ static void unbind_from(unsigned);
+
+ virtual UInt64 get_data_size() const { return 0; }