Add Tally example;

examples/Debugging/Tally/main.lua

@@ -0,0 +1,34 @@
+function lovr.load()
+  stats = { 0, 0, 0, 0 }
+  tally = lovr.graphics.newTally('shader', 1, 1)
+  readbacks = {}
+end
+
+function lovr.update(dt)
+  while readbacks[1] and readbacks[1]:isComplete() do
+    stats = readbacks[1]:getData()
+    table.remove(readbacks, 1)
+  end
+end
+
+function lovr.draw(pass)
+  -- Track metrics in the Tally when drawing the cube
+  pass:tick(tally, 1)
+  pass:cube(0, 0.7, -1, .5, lovr.headset.getTime())
+  pass:tock(tally, 1)
+
+  -- Read back the tally data
+  local tx = lovr.graphics.getPass('transfer')
+  local readback = tx:read(tally, 1)
+  table.insert(readbacks, readback)
+
+  -- Render latest tally results
+  pass:text(('%s: %s\n%s: %s\n%s: %s\n%s: %s'):format(
+    'vertices', stats[1],
+    'vertexshader', stats[2],
+    'visibletriangles', stats[3],
+    'fragmentshader', stats[4]
+  ), 0, 1.7, -1, .1)
+
+  return lovr.graphics.submit(pass, tx)
+end

examples/init.lua

@@ -47,5 +47,6 @@ return {
   'UI/Spectator_Camera',
   'Optimization/Instancing',
   'Debugging/FPS_Controls',
-  'Debugging/Raw_Input'
+  'Debugging/Raw_Input',
+  'Debugging/Tally'
 }