You should start as i did
you have a manager class that has a list of screens and only renders and unpdate the selected screen, create a control base class that has a rectangle(all controls are rectangles) and delegates to any event you want to add, this base class has to have a method update a a method draw, in the method update check if the mouse is on the rectangle and fire the added events here is a sample in c#, if you don't want to use glut for text use glFonts.
using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
namespace ShadowEngine.VisualControls
{
public delegate void OnClick();
public delegate string Function();
public delegate string FunctionParameter(object objeto);
public abstract class Control
{
protected string accesibleName = "null";
protected OnClick onClick;
protected Rectangle areaRectangle;
protected Color fontColor = Color.White;
protected int zOrder;
protected int displayList;
protected IntPtr textFont;
protected bool discard;
public string Name
{
get { return accesibleName; }
}
}
}
using System;
using Tao.OpenGl;
using System.Drawing;
using ShadowEngine.Sound;
namespace ShadowEngine.VisualControls
{
public class Button : Control, IControl
{
bool isPressed;
string text = "";
string textHoverS, texPressedS, texNormalS;
int textHover, texPressed, texNormal, texCurrent;
int textWidth;
Vector2 textPosition = new Vector2(0, 0);
Vector2 buttonPos;
public Button(Rectangle rectangle, string text, OnClick onClick)
{
buttonPos.X = rectangle.X;
buttonPos.Y = rectangle.Y;
base.zOrder = 0;
this.text = text;
this.areaRectangle = rectangle;
base.onClick = onClick;
texNormalS = "normal.jpg";
texPressedS = "pressed.jpg";
textHoverS = "hover.jpg";
texCurrent = texNormal;
textWidth = Sprite.FontWidth(Glut.GLUT_BITMAP_HELVETICA_18, text);
textPosition = new Vector2(areaRectangle.X + (areaRectangle.Width - textWidth) / 2,
areaRectangle.Y + ((areaRectangle.Height - 15) / 2) + 14);
this.textFont = Glut.GLUT_BITMAP_HELVETICA_18;
}
public Button(Rectangle rectangle, OnClick onClick, string texHover,
string texPressed, string texNormal, IntPtr textFont)
{
buttonPos.X = rectangle.X;
buttonPos.Y = rectangle.Y;
base.zOrder = 0;
this.areaRectangle = rectangle;
this.onClick = onClick;
this.texNormalS = texNormal;
this.texPressedS = texPressed;
this.textHoverS = texHover;
this.textFont = textFont;
this.fontColor = Color.White;
}
public bool Discard()
{
return base.discard;
}
public int ZOrder()
{
return zOrder;
}
public Vector2 GetPos()
{
return buttonPos;
}
public void SetPos(Vector2 vect)
{
buttonPos = vect;
areaRectangle.X = vect.X;
areaRectangle.Y = vect.Y;
textPosition = new Vector2(areaRectangle.X + (areaRectangle.Width - textWidth) / 2,
areaRectangle.Y + ((areaRectangle.Height - 15) / 2) + 14);
}
public Rectangle GetRectangle()
{
return areaRectangle;
}
public string AccesibleName()
{
return accesibleName;
}
public void Create()
{
textHover = ContentManager.GetTextureByName(textHoverS);
texPressed = ContentManager.GetTextureByName(texPressedS);
texNormal = ContentManager.GetTextureByName(texNormalS);
texCurrent = texNormal;
}
public void Update(Cursor cursor)
{
if (areaRectangle.Contains(cursor.Position))
{
texCurrent = textHover;
if (cursor.State == Glut.GLUT_DOWN)
{
isPressed = true;
texCurrent = texPressed;
}
else
if (isPressed)
{
if (cursor.State == Glut.GLUT_UP)
{
isPressed = false;
texCurrent = texNormal;
if (onClick != null)
{
AudioPlayback.PlayOne("click.wav");
base.onClick.Invoke();
}
}
}
}
else
{
isPressed = false;
texCurrent = texNormal;
}
}
public void Draw()
{
Sprite.DrawSprite(areaRectangle, texCurrent);
Sprite.DrawText(textPosition.X, textPosition.Y, text, textFont, fontColor);
}
}
}
1
i may sound like i dont know what im doing and thats because i do im guesser / reader 
