New shaders, remake of Android placement partially done

core/src/io/anuke/mindustry/entities/BlockBuilder.java

@@ -30,6 +30,20 @@ public interface BlockBuilder {
     /**Returns the queue for storing build requests.*/
     Queue<BuildRequest> getPlaceQueue();
 
+    /**If a place request matching this signature is present, it is removed.
+     * Otherwise, a new place request is added to the queue.*/
+    default void replaceBuilding(int x, int y, int rotation, Recipe recipe){
+        for(BuildRequest request : getPlaceQueue()){
+            if(request.x == x && request.y == y){
+                clearBuilding();
+                addBuildRequest(request);
+                return;
+            }
+        }
+
+        addBuildRequest(new BuildRequest(x, y, rotation, recipe));
+    }
+
     /**Clears the placement queue.*/
     default void clearBuilding(){
         getPlaceQueue().clear();

core/src/io/anuke/mindustry/entities/Player.java

@@ -245,9 +245,12 @@ public class Player extends Unit implements BlockBuilder {
 		Draw.tscl(fontScale);
 	}
 
+	/**Draw all current build requests. Does not draw the beam effect, only the positions.*/
 	public void drawBuildRequests(){
 		for (BuildRequest request : getPlaceQueue()) {
+
 			if(request.remove){
+				//draw removal request
 				Draw.color(Palette.remove);
 				Draw.alpha(0.4f);
 				Lines.stroke(1f);
@@ -270,11 +273,17 @@ public class Player extends Unit implements BlockBuilder {
 				Lines.poly(tile.drawx(), tile.drawy(),
 						4, tile.block().size * tilesize /2f * (1f-progress) + Mathf.absin(Timers.time(), 3f, 1f));
 			}else{
+				//draw place request
 				Draw.color(Palette.accent);
 				Lines.stroke((1f-request.progress));
+
 				Lines.poly(request.x * tilesize + request.recipe.result.offset(),
 						request.y * tilesize + request.recipe.result.offset(),
 						4, request.recipe.result.size * tilesize /2f + Mathf.absin(Timers.time(), 3f, 1f));
+
+				Lines.poly(request.x * tilesize + request.recipe.result.offset(),
+						request.y * tilesize + request.recipe.result.offset(),
+						4, request.recipe.result.size * tilesize /2f + 2f, 45 + 15);
 			}
 		}