How to render a tilemap efficiently? [duplicate]

Question

This question already has an answer here:

• How'd they do it: Millions of tiles in Terraria 7 answers

I'm using this code to load a tiled map, composed of 1000x1000 32x32px tiles:

map = new TmxMapLoader().load("levels/xyz.tmx");

camera = new OrthographicCamera();

camera.setToOrtho(false, Constants.WORLD_WINDOW_SIZE.x / 32,
            Constants.WORLD_WINDOW_SIZE.y / 32);

renderer = new OrthogonalTiledMapRenderer(map, 1 / 32f);

renderer.getSpriteBatch().disableBlending();

renderer.setView(camera);

And this code for rendering:

camera.update();
renderer.setView(camera);   
renderer.render();

However, I have huge performance issues. How can I optimize this code ? Will splitting the map in multiple submaps help?

Greetings, TM3P

Answer 1

In addition to the techniques discussed in the link above, think about frame layering as well. In my game engine (board is 750 x 450 hexes of 32^2 pixels) I triple buffer the display into map, units, and highlights. On each Paint cycle:

• MapBuffer is repainted only if the view has panned or zoomed;
• UnitBuffer is refreshed from MapBuffer and units repainted only if one or more units has moved;
• HighlightBuffer is refreshed from UnitBuffer and repainted; and
• HighightBuffer is drawn to screen.