private static Vertex[] CreateVertices()
{
var topLeft = new Vertex { Position = new Vector3(-1f, 1f, 0f), Color = new Color4(1f, 0f, 0f) };
var topRight = new Vertex { Position = new Vector3(1f, 1f, 0f), Color = new Color4(0f, 0f, 1f) };
var bottomLeft = new Vertex { Position = new Vector3(-1f, -1f, 0f), Color = new Color4(0f, 1f, 0f) };
var bottomRight = new Vertex { Position = new Vector3(1f, -1f, 0f), Color = new Color4(1f, 1f, 0f) };
return new[] { topLeft, topRight, bottomLeft, bottomRight };
}