using StgSharp.Math;
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Text;

namespace StgSharp.Graphics
{
    public unsafe class ElementBuffer : IDisposable, IBufferObject
    {
        uint[] _bufferID;
        private IglFunc GL;

        internal ElementBuffer(int n, IglFunc glFunc)
        {
            _bufferID = new uint[n];
            GL = glFunc;
            fixed (uint* id = _bufferID)
            {
                GL.GenBuffers(n, id);
            }
        }

        public uint this[int n]
        {
            get { return _bufferID[n]; }
        }

        public void Bind(int index)
        {
            GL.BindBuffer(BufferType.ELEMENT_ARRAY_BUFFER, _bufferID[index]);
        }

        public void SetValue<T>(int index, T[] bufferArray, BufferUsage usage)
            where T : struct, IConvertible
        {
            GL.BindBuffer(BufferType.ELEMENT_ARRAY_BUFFER, _bufferID[index]);
            GL.SetBufferData(BufferType.ELEMENT_ARRAY_BUFFER, bufferArray, usage);
        }

        public void Dispose()
        {
            fixed (uint* id = _bufferID)
            {
                GL.DeleteBuffers(_bufferID.Length, id);
            }
        }


    }
}