Added require_all method to replace explicitly requiring every source file, added SoundManager and sound effects, added sound for shield/health regen

lib/sound_effects/fade_in.rb

@@ -0,0 +1,32 @@
+class IMICFPS
+  class SoundEffect
+    class FadeIn < SoundEffect
+      def setup
+        @start_time = Gosu.milliseconds
+        @duration = @options[:duration] # in milliseconds
+        @initial_volume = @options[:volume] ? @options[:volume] : 0.0
+        @sound = @options[:sound]
+
+        raise "duration not specified!" unless @duration
+
+        @channel = @sound.play(calculate_volume)
+      end
+
+      def ratio
+        (Gosu.milliseconds - @start_time.to_f) / @duration
+      end
+
+      def calculate_volume
+        volume = (SoundManager.sfx_volume - @initial_volume) * ratio
+      end
+
+      def update
+        @channel.volume = calculate_volume
+      end
+
+      def done?
+        (Gosu.milliseconds - @start_time.to_f) / @duration >= 1.0
+      end
+    end
+  end
+end