Why am I struggling so much to get my game to look right on mobile?

selimanac · May 15, 2025, 7:03am

I also shared the link to the source, where you can see what those are.

game_width / game_height is your game display size (in your case, 540x960).

display_width / display_height or window_width / window_height is the actual window size(which is your phones screen size), which you can get using window.get_size or, better, using window.set_listener.

You can calculate the zoom using those parameters. It is not useful to set the zoom manually, as it may vary depending on the window(display) size and window scale(device scale and dpi).

github.com/britzl/template-lowres

lowrez/render/coords.lua

da0684a59


      
          local proj_w = sys.get_config_int("display.width", 960)
          local proj_h = sys.get_config_int("display.height", 640)
          
          M.window_width, M.window_height = proj_w, proj_h
          M.game_width = 64
          M.game_height = 64
          M.scale_snap = true
          
          
          function M.get_zoom()
          	local zoom = math.min(M.window_width / M.game_width, M.window_height / M.game_height) / window.get_display_scale() -- <- TODO: Test this on actual device
          	if M.scale_snap then
          		zoom = math.max(1, math.floor(zoom))
          	end
          	return zoom
          end
          
          local function get_offset(zoom)
          	local w, h = M.game_width * zoom, M.game_height * zoom
          	return (M.window_width - w) / 2, (M.window_height - h) / 2
          end