using System;
using ANX.BaseDirectX;
using ANX.Framework.Graphics;
using ANX.Framework.NonXNA.RenderSystem;
using SharpDX;
using Dx10 = SharpDX.Direct3D10;

// This file is part of the ANX.Framework created by the
// "ANX.Framework developer group" and released under the Ms-PL license.
// For details see: http://anxframework.codeplex.com/license

namespace ANX.RenderSystem.Windows.DX10
{
	public class VertexBuffer_DX10 : BaseVertexBuffer<Dx10.Buffer>, INativeVertexBuffer, IDisposable
	{
		#region Constructor
		public VertexBuffer_DX10(GraphicsDevice graphics, VertexDeclaration vertexDeclaration, int vertexCount, BufferUsage usage)
		{
			GraphicsDeviceWindowsDX10 gd10 = graphics.NativeDevice as GraphicsDeviceWindowsDX10;
			Dx10.Device device = gd10 != null ? gd10.NativeDevice as Dx10.Device : null;

			InitializeBuffer(device, vertexDeclaration, vertexCount, usage);
		}

		internal VertexBuffer_DX10(Dx10.Device device, VertexDeclaration vertexDeclaration, int vertexCount, BufferUsage usage)
		{
			InitializeBuffer(device, vertexDeclaration, vertexCount, usage);
		}
		#endregion

		#region InitializeBuffer
		private void InitializeBuffer(Dx10.Device device, VertexDeclaration vertexDeclaration, int vertexCount, BufferUsage usage)
		{
			this.vertexStride = vertexDeclaration.VertexStride;

			//TODO: translate and use usage

			if (device != null)
			{
				var description = new Dx10.BufferDescription()
				{
					Usage = Dx10.ResourceUsage.Dynamic,
					SizeInBytes = vertexDeclaration.VertexStride * vertexCount,
					BindFlags = Dx10.BindFlags.VertexBuffer,
					CpuAccessFlags = Dx10.CpuAccessFlags.Write,
					OptionFlags = Dx10.ResourceOptionFlags.None
				};

				NativeBuffer = new Dx10.Buffer(device, description);
				NativeBuffer.Unmap();
			}
		}
		#endregion

		protected override DataStream MapBufferWrite()
		{
			return NativeBuffer.Map(Dx10.MapMode.WriteDiscard);
		}

		protected override DataStream MapBufferRead()
		{
			return NativeBuffer.Map(Dx10.MapMode.Read);
		}

		protected override void UnmapBuffer()
		{
			NativeBuffer.Unmap();
		}
	}
}