openGL: Add preliminary multi-texturing code.

3-mid/opengl/source/lean/model/opengl-model-hexagon-lit_textured_x2.ads

@@ -0,0 +1,51 @@
+with
+     openGL.Geometry,
+     openGL.Texture;
+
+
+package openGL.Model.hexagon.lit_textured_x2
+--
+--  Models a lit, colored and textured hexagon.
+--
+is
+   type Item is new Model.item with private;
+   type View is access all Item'Class;
+
+   type Face is
+      record
+         Texture_1 : openGL.asset_Name          := null_Asset;     -- The texture to be applied to the hex.
+         Texture_2 : openGL.asset_Name          := null_Asset;     -- The texture to be applied to the hex.
+         Fade_1    : openGL.Geometry.fade_Level := 0.5;
+         Fade_2    : openGL.Geometry.fade_Level := 0.5;
+      end record;
+
+
+   ---------
+   --- Forge
+   --
+
+   function new_Hexagon (Radius : in Real;
+                         Face   : in lit_textured_x2.Face) return View;
+
+
+   --------------
+   --- Attributes
+   --
+
+   procedure Texture_1_is (Self : in out Item;   Now : in openGL.asset_Name);
+   procedure Texture_2_is (Self : in out Item;   Now : in openGL.asset_Name);
+
+
+   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.hexagon.item with
+      record
+         Face : lit_textured_x2.Face;
+      end record;
+
+end openGL.Model.hexagon.lit_textured_x2;