Function ogl33::FramebufferTextureLayer::load_with

pub unsafe fn load_with<F>(load_fn: F) where
    F: FnMut(*const c_char) -> *const c_void, 

Load FramebufferTextureLayer using the provided loader.

Safety

• This mostly trusts whatever the loader function says, so the loader must
  provide the correct pointer or a null pointer.