Add initial prototype.

3-mid/opengl/applet/demo/models/render_billboards/launch_render_billboards.adb

@@ -0,0 +1,70 @@
+with
+     openGL.Visual,
+     openGL.Model.Billboard.        textured,
+     openGL.Model.Billboard.colored_textured,
+     openGL.Palette,
+     openGL.Demo;
+
+procedure launch_render_Billboards
+--
+--  Exercise the render of billboard models.
+--
+is
+   use openGL,
+       openGL.Model,
+       openGL.Math,
+       openGL.linear_Algebra_3d;
+
+   the_Texture : constant openGL.asset_Name :=  to_Asset ("assets/opengl/texture/Face1.bmp");
+begin
+   Demo.print_Usage;
+   Demo.define ("openGL 'Render Billboards' Demo");
+   Demo.Camera.Position_is ([0.0, 0.0, 10.0],
+                            y_Rotation_from (to_Radians (0.0)));
+   declare
+      --  The Models.
+      --
+      the_Billboard_Model : constant Model.Billboard.textured.view
+        := Model.Billboard.textured.forge.new_Billboard (--Scale   => (1.0, 1.0, 1.0),
+                                                         Plane   => Billboard.xy,
+                                                         Texture => the_Texture);
+
+      the_colored_Billboard_Model : constant Model.Billboard.colored_textured.view
+        := Model.Billboard.colored_textured.new_Billboard (--Scale   => (1.0, 1.0, 1.0),
+                                                           Plane   => Billboard.xy,
+                                                           Color   => (Palette.Green, Opaque),
+                                                           Texture => the_Texture);
+      --  The Sprites.
+      --
+      use openGL.Visual.Forge;
+
+      the_Sprites : constant openGL.Visual.views := [new_Visual (        the_Billboard_Model.all'Access),
+                                                     new_Visual (the_colored_Billboard_Model.all'Access)];
+   begin
+      the_Sprites (2).Site_is ([3.0, 0.0, 0.0]);
+
+      --  Main loop.
+      --
+      while not Demo.Done
+      loop
+         -- Handle user commands.
+         --
+         Demo.Dolly.evolve;
+         Demo.Done := Demo.Dolly.quit_Requested;
+
+         --  Render the sprites.
+         --
+         Demo.Camera.render (the_Sprites);
+
+         while not Demo.Camera.cull_Completed
+         loop
+            delay Duration'Small;
+         end loop;
+
+         Demo.Renderer.render;
+         Demo.FPS_Counter.increment;    -- Frames per second display.
+      end loop;
+   end;
+
+   Demo.destroy;
+end launch_render_Billboards;

3-mid/opengl/applet/demo/models/render_billboards/render_billboards.gpr

@@ -0,0 +1,21 @@
+with
+     "opengl_demo",
+     "lace_shared"; 
+
+project render_Billboards
+is
+
+   for Object_Dir use "build";
+   for Exec_Dir   use ".";
+   for Main       use ("launch_render_billboards.adb");
+
+   package Ide      renames Lace_shared.Ide;
+   package Builder  renames Lace_shared.Builder;
+   package Compiler renames Lace_shared.Compiler;
+   package Binder   renames Lace_shared.Binder;
+
+   package Linker is
+      for Default_Switches ("ada") use ("-g", "-lX11", "-lGL");
+   end Linker;
+
+end render_Billboards;