Allow changing of camera controller

src/main/java/com/replaymod/replay/camera/CameraControllerRegistry.java

@@ -0,0 +1,26 @@
+package com.replaymod.replay.camera;
+
+import com.google.common.base.Function;
+import com.google.common.base.Preconditions;
+
+import java.util.Collections;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class CameraControllerRegistry {
+    private final Map<String, Function<CameraEntity, CameraController>> constructors = new ConcurrentHashMap<>();
+
+    public void register(String name, Function<CameraEntity, CameraController> constructor) {
+        Preconditions.checkState(!constructors.containsKey(name), "Controller " + name + " is already registered.");
+        constructors.put(name, constructor);
+    }
+
+    public Set<String> getControllers() {
+        return Collections.unmodifiableSet(constructors.keySet());
+    }
+
+    public CameraController create(String name, CameraEntity cameraEntity) {
+        return constructors.get(name).apply(cameraEntity);
+    }
+}

src/main/java/com/replaymod/replay/camera/CameraEntity.java

@@ -1,6 +1,8 @@
 package com.replaymod.replay.camera;
 
+import com.replaymod.core.events.SettingsChangedEvent;
 import com.replaymod.replay.ReplayModReplay;
+import com.replaymod.replay.Setting;
 import eu.crushedpixel.replaymod.holders.AdvancedPosition;
 import lombok.Getter;
 import lombok.Setter;
@@ -39,7 +41,7 @@ public class CameraEntity extends EntityPlayerSP {
     public CameraEntity(Minecraft mcIn, World worldIn, NetHandlerPlayClient netHandlerPlayClient, StatFileWriter statFileWriter) {
         super(mcIn, worldIn, netHandlerPlayClient, statFileWriter);
         FMLCommonHandler.instance().bus().register(this);
-        cameraController = new VanillaCameraController(mc, this);
+        cameraController = ReplayModReplay.instance.createCameraController(this);
     }
 
     /**
@@ -214,4 +216,11 @@ public class CameraEntity extends EntityPlayerSP {
             lastControllerUpdate = now;
         }
     }
+
+    @SubscribeEvent
+    public void onSettingsChanged(SettingsChangedEvent event) {
+        if (event.getKey() == Setting.CAMERA) {
+            cameraController = ReplayModReplay.instance.createCameraController(this);
+        }
+    }
 }