Moved silo to new da_common folder

example_2.1/example_2_1_project.gpr

@@ -1,9 +1,9 @@
-with "../../../../Ada_Source/OpenGLAda/examples/common/common.gpr";
+with "/Ada_Source/OpenGLAda/examples/common/common.gpr";
 limited with "/Ada_Source/OpenGLAda/opengl-glfw.gpr";
 
 project Example_2_1_Project is
 
-   for Source_Dirs use ("src", "../Reference_Implementation/src", "../../../../Ada_Source/OpenGLAda/examples/common");
+   for Source_Dirs use ("src", "../Reference_Implementation/src", "../ga_common");
    for Object_Dir use "obj";
    for Exec_Dir use ".";
    for Main use ("bivectors.adb");

ga_common/silo.adb

@@ -0,0 +1,58 @@
+
+with Ada.Containers.Doubly_Linked_Lists;
+
+package body Silo is
+   use Ada.Containers;
+
+   package Label_Container is new Doubly_Linked_Lists (Label_Data);
+   type Label_List is new Label_Container.List with null record;
+
+   theStack : Label_List;
+
+   procedure Push (Data : Label_Data) is
+   begin
+      Append (theStack, Data);
+   end Push;
+
+   --  -----------------------------------------------------------------
+
+   function Pull return Label_Data is
+      Data : Label_Data;
+   begin
+      if Is_Empty (theStack) then
+         raise Empty_Stack;
+      end if;
+
+      Data := First_Element (theStack);
+      Delete_First (theStack);
+      return Data;
+   end Pull;
+
+   --  -----------------------------------------------------------------
+
+   function Set_Data (Label_String : Unbounded_String;
+                      Label_Position : GL.Types.Singles.Vector2)
+                      return Label_Data is
+   begin
+       return  (Label_String, Label_Position);
+   end Set_Data;
+
+   --  -----------------------------------------------------------------
+
+   procedure Get_Data (Label_String  : out Unbounded_String;
+                       Label_Position : out GL.Types.Singles.Vector2) is
+      theData : Label_Data := Pull;
+   begin
+       Label_String:= theData.Label_String;
+       Label_Position := theData.Label_Position;
+   end Get_Data;
+
+   --  -----------------------------------------------------------------
+   function Size return Integer is
+   begin
+      return Integer (Length (theStack));
+   end Size;
+
+   --  -----------------------------------------------------------------
+
+end Silo;

ga_common/silo.ads

@@ -0,0 +1,27 @@
+
+with Ada.Strings.Unbounded; use Ada.Strings.Unbounded;
+
+with GL.Types;
+
+package Silo is
+
+   type Label_Data is private;
+
+   Empty_Stack : Exception;
+
+   procedure Get_Data (Label_String   : out Unbounded_String;
+                       Label_Position : out GL.Types.Singles.Vector2);
+   procedure Push (Data : Label_Data);
+   function Pull return Label_Data;
+   function Set_Data (Label_String : Unbounded_String;
+                       Label_Position : GL.Types.Singles.Vector2)
+                       return Label_Data;
+   function Size return Integer;
+
+private
+   type Label_Data is record
+      Label_String      : Unbounded_String;
+      Label_Position    : GL.Types.Singles.Vector2;
+   end record;
+
+end Silo;