Just rendering a texture?

[eboatwright]

I'm making my own little toolbox that I can use for my Bevy games. And right now, I'm on tilemap rendering. I already have a system for macroquad, (https://github.com/eboatwright/tile) and I'm working on making a Bevy version. So, what I need to know is can you just render a texture inside a system, without making another Entity for it?
Something like this?

fn tilemap_render_system(query: Query<&Tilemap>) {
    for tilemap in query.iter() {
        for tile in tilemap.tiles.iter() {
            draw_texture(
                tilemap.texture,
                x * tilemap.tile_size,
                y * tilemap.tile_size,
            );
        }
    }
}