add on-screen performance logging

main.lua

@@ -29,11 +29,15 @@ function love.load()
     love.window.setMode(1080, 720, { resizable = true, msaa = 4, vsync = true })
 end
 
+local lt = "0"
 function love.update(dt)
+    local t1 = love.timer.getTime()
     Tree.controls:poll()
     Tree.panning:update(dt)
     Tree.level:update(dt)
     Tree.controls:cache()
+    local t2 = love.timer.getTime()
+    lt = string.format("%.3f", (t2 - t1) * 1000)
 end
 
 local function coverTransform(img, containerW, containerH)
@@ -45,7 +49,9 @@ local function coverTransform(img, containerW, containerH)
     return scale, offsetX, offsetY, sw, sh
 end
 
+local dt = "0"
 function love.draw()
+    local t1 = love.timer.getTime()
     local scale, ox, oy = coverTransform(Tree.assets.files.cats, love.graphics.getWidth(), love.graphics.getHeight())
 
     love.graphics.push()
@@ -61,10 +67,12 @@ function love.draw()
                 nil, 1 / 32, 1 / 32)
         end
     end
-
-
     Tree.level:draw()
-
-
     Tree.level.camera:detach()
+
+    local stats = "fps: " .. love.timer.getFPS() .. " lt: " .. lt .. " dt: " .. dt
+    love.graphics.print(stats, 10, 10)
+
+    local t2 = love.timer.getTime()
+    dt = string.format("%.3f", (t2 - t1) * 1000)
 end