Function gles30::load_gles_with

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

Load each GLES symbol using a provided loader function.

This allows for the use of functions like glfwGetProcAddress or SDL_GL_GetProcAddress.

gles30::load_with(|ptr| SDL_GL_GetProcAddress(ptr));

Function loading will attempt to use fallback options if the first lookup fails.

Safety

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