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_ebo = new (_gl, Indices, BufferTargetARB.ElementArrayBuffer);
        _vbo = new (_gl, Vertices, BufferTargetARB.ArrayBuffer);
        _vao = new (_gl, _vbo, _ebo);

        _vao.VertexAttributePointer(0, 2, VertexAttribPointerType.Float, 4, 0);
        _vao.VertexAttributePointer(1, 2, VertexAttribPointerType.Float, 4, 2);

    _gl.UseProgram(_shader.Handle);
    _vao.Bind();
    _gl.ActiveTexture(TextureUnit.Texture0);
    _gl.BindTexture(TextureTarget.Texture2D, texture.Handle);
    _gl.Uniform1(_uTextureLocation, 0);
    SetMatrix(_uViewLocation, camMatrix.View);
    SetMatrix(_uProjectionLocation, camMatrix.Projection);
                
    var model = Matrix4x4.Identity * Matrix4x4.CreateScale(size.X, size.Y, 1) * Matrix4x4.CreateRotationZ(DegreesToRadians(rotation)) * Matrix4x4.CreateTranslation(position.X, position.Y, 0);
    SetMatrix(_uModelLocation, model);
                
    _gl.DrawElements(PrimitiveType.Triangles, (uint) Indices.Length, DrawElementsType.UnsignedInt, null);

    _ebo = new (_gl, Indices, BufferTargetARB.ElementArrayBuffer);
    _vbo = new (_gl, Vertices, BufferTargetARB.ArrayBuffer);
    _vao = new (_gl, _vbo, _ebo);
    _vao.VertexAttributePointer(0, 2, VertexAttribPointerType.Float, 0, 0);

    _gl.UseProgram(_shader.Handle);
    _vao.Bind();

    _gl.Uniform4(_uColorLocation, Vector4.One);

    SetMatrix(_uViewLocation, camMatrix.View);
    SetMatrix(_uProjectionLocation, camMatrix.Projection);

    var model = Matrix4x4.Identity
      * Matrix4x4.CreateScale(size.X, size.Y, 1)
      * Matrix4x4.CreateRotationZ(DegreesToRadians(rotation))
      * Matrix4x4.CreateTranslation(position.X, position.Y, 0);
    SetMatrix(_uModelLocation, model);
        
    _gl.DrawElements(PrimitiveType.LineLoop, (uint) Indices.Length, DrawElementsType.UnsignedInt, null);

public unsafe BufferObject(GL gl, Span<TDataType> data, BufferTargetARB bufferType)
    {
        _gl = gl;
        _bufferType = bufferType;

        _handle = _gl.GenBuffer();
        Bind();
        fixed (void* d = data)
        {
            _gl.BufferData(bufferType, (nuint) (data.Length * sizeof(TDataType)), d, BufferUsageARB.StaticDraw);
        }
    }

public VertexArrayObject(GL gl, BufferObject<TVertexType> vbo, BufferObject<TIndexType> ebo)
    {
        _gl = gl;

        _handle = _gl.GenVertexArray();
        Bind();
        vbo.Bind();
        ebo.Bind();
    }

vao.bind()
vbo.bind()
vao.VertexAttribStuff(...)
vbo2.bind()
vao.VertexAttribStuff(...)

using Serilog;
using Silk.NET.OpenGL;

namespace ProjectUnknown.Engine.Rendering;

public class BufferObject<TDataType> : IDisposable
    where TDataType : unmanaged
{
    private uint _handle;
    private BufferTargetARB _bufferType;
    private GL _gl;

    public unsafe BufferObject(GL gl, Span<TDataType> data, BufferTargetARB bufferType)
    {
        _gl = gl;
        _bufferType = bufferType;

        _handle = _gl.GenBuffer();
        Bind();
        fixed (void* d = data)
        {
            _gl.BufferData(bufferType, (nuint) (data.Length * sizeof(TDataType)), d, BufferUsageARB.StaticDraw);
        }
    }

    public void Bind()
    {
        _gl.BindBuffer(_bufferType, _handle);
    }

    public void Dispose()
    {
        _gl.DeleteBuffer(_handle);
    }
}

using Serilog;
using Silk.NET.OpenGL;

namespace ProjectUnknown.Engine.Rendering;

public class VertexArrayObject<TVertexType, TIndexType> : IDisposable
    where TVertexType : unmanaged
    where TIndexType : unmanaged
{
    private uint _handle;
    private GL _gl;

    public VertexArrayObject(GL gl, BufferObject<TVertexType> vbo, BufferObject<TIndexType> ebo)
    {
        _gl = gl;

        _handle = _gl.GenVertexArray();
        Bind();
        vbo.Bind();
        ebo.Bind();
    }

    public unsafe void VertexAttributePointer(uint index, int count, VertexAttribPointerType type, uint vertexSize, int offSet)
    {
        _gl.VertexAttribPointer(index, count, type, false, vertexSize * (uint) sizeof(TVertexType), (void*) (offSet * sizeof(TVertexType)));
        _gl.EnableVertexAttribArray(index);
    }

    public void Bind()
    {
        _gl.BindVertexArray(_handle);
    }

    public void Dispose()
    {
        _gl.DeleteVertexArray(_handle);
    }
}

_ebo = new (_gl, Indices, BufferTargetARB.ElementArrayBuffer);
    _vbo = new (_gl, Vertices, BufferTargetARB.ArrayBuffer);
    _vao = new (_gl, _vbo, _ebo);
    _vao.VertexAttributePointer(0, 2, VertexAttribPointerType.Float, 0, 0);
    _vao.UnBind();