Minor optimizations

.gitignore

@@ -4,10 +4,11 @@
 /desktop/packr-out/
 /desktop/packr-export/
 /desktop/mindustry-saves/
-/destkop/mindustry-maps/
+/destkop/mindustry-maps/*
 /core/lib/
 *.gif
 
+.attach_*
 ## Java
 
 *.class

core/src/io/anuke/mindustry/core/Control.java

@@ -130,7 +130,6 @@ public class Control extends Module{
 	
 	public void reset(){
 		weapons.clear();
-		renderer.clearTiles();
 		
 		weapons.add(Weapon.blaster);
 		player.weapon = weapons.first();
@@ -161,7 +160,6 @@ public class Control extends Module{
 	
 	public void play(){
 		if(core == null) return;
-		
 		renderer.clearTiles();
 		
 		player.x = core.worldx();

core/src/io/anuke/mindustry/core/Renderer.java

@@ -489,7 +489,7 @@ public class Renderer extends RendererModule{
 		cache = null;
 		if(cbatch != null)
 			cbatch.dispose();
-		cbatch = new CacheBatch(256 * 256 * 3);
+		cbatch = new CacheBatch(Vars.world.width() * Vars.world.height() * 3);
 	}
 	
 	void drawPaths(){

core/src/io/anuke/mindustry/io/SaveIO.java

@@ -115,7 +115,11 @@ public class SaveIO{
 	
 	public static boolean isSaveValid(int slot){
 		try(DataInputStream stream = new DataInputStream(fileFor(slot).read())){
-			return stream.readInt() == fileVersionID;
+			int version = stream.readInt(); //read version
+			stream.readLong(); //read last saved time
+			stream.readByte(); //read the gamemode
+			byte map = stream.readByte(); //read the map
+			return version == fileVersionID && Vars.world.maps().getMap(map) != null;
 		}catch (Exception e){
 			return false;
 		}

desktop/mindustry-maps/maps.json

@@ -1 +0,0 @@
-{"maps":[]}