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

namespace StgSharp.Graphics
{

    public unsafe struct VertexArray : IDisposable, IBufferObject
    {
        internal uint[] _bufferID;
        private IglFunc GL;

        internal VertexArray(int n)
        {
            _bufferID = new uint[n];
            //GL = glFunc;
            fixed (uint* id = _bufferID)
            {
                GL.GenVertexArrays(n, id);
            }
        }

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

        public void Bind(int index)
        {
            GL.BindVertexArray(_bufferID[index]);
        }

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

        public void BindNull()
        {
            GL.BindVertexArray(0);
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public void SetVertexAttribute(uint index, int vertexLength, Type dataType, bool isNomalized, int stride, int pointer)
        {
            GL.SetVertexAttribute(
                index, vertexLength, dataType,
                isNomalized,
                stride, pointer);
        }
    }
}