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Root/src/Graphics/Vertices/VertexDeclarationCache.cs

#region License
/* FNA - XNA4 Reimplementation for Desktop Platforms
 * Copyright 2009-2016 Ethan Lee and the MonoGame Team
 *
 * Released under the Microsoft Public License.
 * See LICENSE for details.
 */
#endregion
 
namespace Microsoft.Xna.Framework.Graphics
{
    /// <summary>
    /// Helper class which ensures we only lookup a vertex
    /// declaration for a particular type once.
    /// </summary>
    /// <typeparam name="T">A vertex structure which implements IVertexType.</typeparam>
    internal static class VertexDeclarationCache<T>
        where T : struct, IVertexType
    {
        #region Public Static Properties
 
        public static VertexDeclaration VertexDeclaration
        {
            get
            {
                if (cached == null)
                {
                    cached = VertexDeclaration.FromType(typeof(T));
                }
 
                return cached;
            }
        }
 
        #endregion
 
        #region Private Static Variables
 
        private static VertexDeclaration cached;
 
        #endregion
    }
}

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