lighttroupe/luz

module EngineTime
    def init_time
        @simulation_speed = 1.0
        @last_frame_time = 0.0
        @total_frame_times = 0.0
        @add_to_engine_time = 0.0
        @time = 0.0
    end

    def update_time(outside_time)
        @frame_time = outside_time        # Real-World Time
        @frame_time_delta = @frame_time - @last_frame_time

        # Engine time (modified by simulation speed)
        @time_delta = (@simulation_speed * @frame_time_delta) + @add_to_engine_time
        @time += @time_delta
        @add_to_engine_time = 0.0
    end

    def record_frame_time
        frame_start = Time.now
        yield
        @total_frame_times += (Time.now - frame_start)
    end

    def add_to_engine_time(amount)
        @add_to_engine_time += amount        # (can be negative)
    end

    def reset_time!
        @time = 0.0
    end

    #
    # Stats
    #
    def average_frame_time
        @total_frame_times / @frame_number
    end
end