anx.framework/ANX.Framework/Graphics/IndexBuffer.cs

using System;
using System.Runtime.InteropServices;
using ANX.Framework.NonXNA;
using ANX.Framework.NonXNA.Development;
using ANX.Framework.NonXNA.RenderSystem;

#region License

//
// This file is part of the ANX.Framework created by the "ANX.Framework developer group".
//
// This file is released under the Ms-PL license.
//
//
//
// Microsoft Public License (Ms-PL)
//
// This license governs use of the accompanying software. If you use the software, you accept this license. 
// If you do not accept the license, do not use the software.
//
// 1.Definitions
//   The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning 
//   here as under U.S. copyright law.
//   A "contribution" is the original software, or any additions or changes to the software.
//   A "contributor" is any person that distributes its contribution under this license.
//   "Licensed patents" are a contributor's patent claims that read directly on its contribution.
//
// 2.Grant of Rights
//   (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations 
//       in section 3, each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to 
//       reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution
//       or any derivative works that you create.
//   (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in 
//       section 3, each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed
//       patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution 
//       in the software or derivative works of the contribution in the software.
//
// 3.Conditions and Limitations
//   (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks.
//   (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software, your 
//       patent license from such contributor to the software ends automatically.
//   (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and attribution 
//       notices that are present in the software.
//   (D) If you distribute any portion of the software in source code form, you may do so only under this license by including
//       a complete copy of this license with your distribution. If you distribute any portion of the software in compiled or 
//       object code form, you may only do so under a license that complies with this license.
//   (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees,
//       or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the
//       extent permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a 
//       particular purpose and non-infringement.

#endregion // License

namespace ANX.Framework.Graphics
{
	[PercentageComplete(100)]
	[TestState(TestStateAttribute.TestState.Untested)]
	public class IndexBuffer : GraphicsResource, IGraphicsResource
	{
		#region Private
		private int indexCount;
		private BufferUsage bufferUsage;
		private IndexElementSize indexElementSize;
		private INativeIndexBuffer nativeIndexBuffer;
		#endregion

		#region Public
		// This is now internal because via befriending the assemblies
		// it's usable in the modules but doesn't confuse the enduser.
		internal INativeIndexBuffer NativeIndexBuffer
		{
			get
			{
				if (nativeIndexBuffer == null)
				{
					CreateNativeBuffer();
				}

				return this.nativeIndexBuffer;
			}
		}

		public BufferUsage BufferUsage
		{
			get
			{
				return this.bufferUsage;
			}
		}

		public int IndexCount
		{
			get
			{
				return this.indexCount;
			}
		}

		public IndexElementSize IndexElementSize
		{
			get
			{
				return this.indexElementSize;
			}
		}
		#endregion

		#region Constructor
		public IndexBuffer(GraphicsDevice graphicsDevice, IndexElementSize indexElementSize, int indexCount, BufferUsage usage)
			: base(graphicsDevice)
		{
			this.indexElementSize = indexElementSize;
			this.indexCount = indexCount;
			this.bufferUsage = usage;

			base.GraphicsDevice.ResourceCreated += GraphicsDevice_ResourceCreated;
			base.GraphicsDevice.ResourceDestroyed += GraphicsDevice_ResourceDestroyed;

			CreateNativeBuffer();
		}

		public IndexBuffer(GraphicsDevice graphicsDevice, Type indexType, int indexCount, BufferUsage usage)
			: base(graphicsDevice)
		{
			if (indexType == typeof(int) ||
					indexType == typeof(uint))
			{
				this.indexElementSize = IndexElementSize.ThirtyTwoBits;
			}
			else if (indexType == typeof(short) ||
				indexType == typeof(ushort))
			{
				this.indexElementSize = IndexElementSize.SixteenBits;
			}
			else
			{
				throw new Exception("can't use IndexType " + indexType.ToString());
			}

			this.indexCount = indexCount;
			this.bufferUsage = usage;

			CreateNativeBuffer();
		}

		~IndexBuffer()
		{
			Dispose();
			base.GraphicsDevice.ResourceCreated -= GraphicsDevice_ResourceCreated;
			base.GraphicsDevice.ResourceDestroyed -= GraphicsDevice_ResourceDestroyed;
		}
		#endregion

		#region GraphicsDevice_ResourceDestroyed
		private void GraphicsDevice_ResourceDestroyed(object sender, ResourceDestroyedEventArgs e)
		{
			if (this.nativeIndexBuffer != null)
			{
				this.nativeIndexBuffer.Dispose();
				this.nativeIndexBuffer = null;
			}
		}
		#endregion

		#region GraphicsDevice_ResourceCreated
		private void GraphicsDevice_ResourceCreated(object sender, ResourceCreatedEventArgs e)
		{
			if (nativeIndexBuffer != null)
			{
				nativeIndexBuffer.Dispose();
				nativeIndexBuffer = null;
			}

			CreateNativeBuffer();
		}
		#endregion

		#region CreateNativeBuffer
		private void CreateNativeBuffer()
		{
			this.nativeIndexBuffer =
				AddInSystemFactory.Instance.GetDefaultCreator<IRenderSystemCreator>().CreateIndexBuffer(GraphicsDevice, this, indexElementSize, indexCount, bufferUsage);
		}
		#endregion

		#region GetData
		public void GetData<T>(int offsetInBytes, T[] data, int startIndex,
			int elementCount) where T : struct
		{
			NativeIndexBuffer.GetData(offsetInBytes, data, startIndex, elementCount);
		}

		public void GetData<T>(T[] data) where T : struct
		{
			NativeIndexBuffer.GetData(data);
		}

		public void GetData<T>(T[] data, int startIndex, int elementCount)
			where T : struct
		{
			NativeIndexBuffer.GetData(data, startIndex, elementCount);
		}
		#endregion

		#region SetData
		public void SetData<T>(int offsetInBytes, T[] data, int startIndex,
			int elementCount) where T : struct
		{
			NativeIndexBuffer.SetData(GraphicsDevice, offsetInBytes, data,
				startIndex, elementCount);
		}

		public void SetData<T>(T[] data) where T : struct
		{
			NativeIndexBuffer.SetData(GraphicsDevice, data);
		}

		public void SetData<T>(T[] data, int startIndex, int elementCount)
			where T : struct
		{
			NativeIndexBuffer.SetData(GraphicsDevice, data, startIndex, elementCount);
		}
		#endregion

		#region Dispose
		public override void Dispose()
		{
			Dispose(true);
		}

		protected override void Dispose(
			[MarshalAs(UnmanagedType.U1)] bool disposeManaged)
		{
			if (this.nativeIndexBuffer != null)
			{
				this.nativeIndexBuffer.Dispose();
				this.nativeIndexBuffer = null;
			}
		}
		#endregion
	}
}