// Copyright (c) 2010-2014 SharpDX - Alexandre Mutel
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;

namespace SharpDX.Direct3D9
{
    public partial class VertexDeclaration
    {
        /// <summary>
        /// Create a vertex shader declaration from the device and the vertex elements.
        /// </summary>
        /// <remarks>
        ///  See the {{Vertex Declaration (Direct3D 9)}} page for a detailed description of how to map vertex declarations between different versions of DirectX. 
        /// </remarks>
        /// <param name="device">The device.</param>
        /// <param name="elements"> An array of <see cref="SharpDX.Direct3D9.VertexElement"/> vertex elements. </param>
        /// <returns><see cref="VertexDeclaration"/> If the method succeeds</returns>
        /// <unmanaged>HRESULT IDirect3DDevice9::CreateVertexDeclaration([In, Buffer] const D3DVERTEXELEMENT9* pVertexElements,[None] IDirect3DVertexDeclaration9** ppDecl)</unmanaged>
        public VertexDeclaration(Device device, VertexElement[] elements)
        {
            device.CreateVertexDeclaration(elements, this);
        }

        /// <summary>
        /// Gets the elements.
        /// </summary>
        /// <unmanaged>HRESULT IDirect3DVertexDeclaration9::GetDeclaration([Out, Buffer] D3DVERTEXELEMENT9* pElement,[InOut] unsigned int* pNumElements)</unmanaged>
        public VertexElement[] Elements
        {
            get
            {
                int count = 0;
                GetDeclaration(null, ref count);
                if (count == 0)
                    return null;

                var buffer = new VertexElement[count];
                GetDeclaration(buffer, ref count);

                return buffer;
            }
        }
    }
}