private void OnLoad(object sender, EventArgs e)
{
// maximize window
WindowState = WindowState.Maximized;
// load program
_programOdd = ProgramFactory.Create <GeodesicProgramOdd>();
_programEqual = ProgramFactory.Create <GeodesicProgram>();
_program = _programOdd;
// create icosahedron and set model matrix
_modelMatrix = Matrix4.CreateScale(1);
_icosahedron = new Icosahedron(5);
_icosahedron.UpdateBuffers();
// bind it to an vao
_vao = new VertexArray();
_vao.Bind();
_vao.BindElementBuffer(_icosahedron.IndexBuffer);
_vao.BindAttribute(_program.Position, _icosahedron.VertexBuffer);
// set some reasonable default state
GL.ClearColor(Color4.Black);
GL.Enable(EnableCap.DepthTest);
// backface culling is done in the tesselation control shader
GL.Enable(EnableCap.CullFace);
GL.CullFace(CullFaceMode.Back);
GL.PatchParameter(PatchParameterInt.PatchVertices, 3);
// lighting stuff
_deferredRenderer = new DeferredRenderer();
// enable controls
_variableHandler.Enable(this);
}