Mobile schematics / Randomized projector reloads

core/src/io/anuke/mindustry/game/Schematics.java

@@ -32,12 +32,14 @@ public class Schematics implements Loadable{
     private static final byte version = 0;
 
     private static final int padding = 2;
+    private static final int maxPreviewsMobile = 32;
     private static final int resolution = 32;
 
     private OptimizedByteArrayOutputStream out = new OptimizedByteArrayOutputStream(1024);
     private Array<Schematic> all = new Array<>();
     private OrderedMap<Schematic, FrameBuffer> previews = new OrderedMap<>();
     private FrameBuffer shadowBuffer;
+    private long lastClearTime;
 
     public Schematics(){
         Events.on(DisposeEvent.class, e -> {
@@ -144,6 +146,19 @@ public class Schematics implements Loadable{
     }
 
     public FrameBuffer getBuffer(Schematic schematic){
+        //dispose unneeded previews to prevent memory outage errors.
+        //only runs every 2 seconds
+        if(mobile && Time.timeSinceMillis(lastClearTime) > 1000 * 2 && previews.size > maxPreviewsMobile){
+            Array<Schematic> keys = previews.orderedKeys().copy();
+            for(int i = 0; i < previews.size - maxPreviewsMobile; i++){
+                //dispose and remove unneeded previews
+                previews.get(keys.get(i)).dispose();
+                previews.remove(keys.get(i));
+            }
+            //update last clear time
+            lastClearTime = Time.millis();
+        }
+
         if(!previews.containsKey(schematic)){
             Draw.blend();
             Draw.reset();