//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="EBO"
// Project: StgSharp
// AuthorGroup: Nitload
// Copyright (c) Nitload. All rights reserved.
//     
// 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 StgSharp.Graphics;
using StgSharp.Graphics.OpenGL;
using StgSharp.Internal.OpenGL;
using StgSharp.Mathematics;

using System;
using System.Collections.Generic;
using System.Numerics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;

namespace StgSharp.Graphics.OpenGL
{
    /// <summary>
    ///   A collection of handle to Element BufferHandle Object in OpenglFunc. Each <see
    ///   langword="uint" /> value indexed from instance of this class this is the only handle to
    ///   one Element BufferHandle Object.
    /// </summary>
    public sealed unsafe class ElementBuffer : GlBufferObjectBase
    {

        internal ElementBuffer(int n, glRender binding)
            : base(binding)
        {
            _bufferHandle = GL.GenBuffers(n);
        }

        public sealed override void Bind(int index)
        {
            GL.BindBuffer(BufferType.ElementArrayBuffer, _bufferHandle[index]);
        }

        public void SetValue<T>(int index, T[] bufferArray, BufferUsage usage) where T: unmanaged, INumber<T>
        {
            GL.BindBuffer(BufferType.ElementArrayBuffer, _bufferHandle[index]);
            GL.SetBufferData<T>(BufferType.ElementArrayBuffer, bufferArray, usage);
        }

        public void SetValue<T>(int index, ReadOnlySpan<T> bufferSpan, BufferUsage usage) where T: unmanaged, INumber<T>
        {
            GL.BindBuffer(BufferType.ElementArrayBuffer, _bufferHandle[index]);
            GL.SetBufferData<T>(BufferType.ElementArrayBuffer, bufferSpan, usage);
        }

        protected sealed override void Dispose(bool disposing)
        {
            if (disposing) {
                GL.DeleteBuffers(_bufferHandle);
            }
        }

    }
}