Add initial prototype.

3-mid/opengl/source/lean/model/opengl-model-sphere-lit_textured.ads

@@ -0,0 +1,36 @@
+with
+     openGL.Font,
+     openGL.Geometry;
+
+
+package openGL.Model.sphere.lit_textured
+--
+--  Models a lit and textured sphere.
+--
+--  The texture is often a mercator projection to be mapped onto the sphere.
+--
+is
+   type Item is new Model.sphere.item with private;
+   type View is access all Item'Class;
+
+
+   function new_Sphere (Radius     : in Real;
+                        lat_Count  : in Positive   := default_latitude_Count;
+                        long_Count : in Positive   := default_longitude_Count;
+                        Image      : in asset_Name := null_Asset) return View;
+
+
+   overriding
+   function to_GL_Geometries (Self : access Item;   Textures : access Texture.name_Map_of_texture'Class;
+                                                    Fonts    : in     Font.font_id_Map_of_font) return Geometry.views;
+
+
+
+private
+
+   type Item is new Model.sphere.item with     -- TODO: Add 'Color' component.
+      record
+         Image : asset_Name := null_Asset;
+      end record;
+
+end openGL.Model.sphere.lit_textured;