G2 support

tests/drivers/gold_transition_shots.lua

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+-- DoBattleTransition, frame by frame.
+--
+--   POKEPORT_GAME=gold POKEPORT_DRIVER=tests/drivers/gold_transition_shots.lua love .
+--
+-- Shoots each of the four outros (spin / speckle / sine / zoom) plus the Poke
+-- Ball overlay a trainer battle stamps over the map first.  POKEPORT_SHOT_INTERVAL
+-- picks the sampling; the default walks the whole thing at 6 frames.
+--
+-- Shots land in /tmp/gold-transition/<style>/.
+local U = require("tests.drivers.util")
+
+local Transition = require("src.ui.gen2.BattleTransition")
+
+return function(game)
+  local out = os.getenv("POKEPORT_SHOT_DIR") or "/tmp/gold-transition"
+  local interval = tonumber(os.getenv("POKEPORT_SHOT_INTERVAL") or "") or 6
+
+  U.wait(45)
+  local world = game.world
+  assert(world and world.map, "gold world did not boot")
+  world:setMap("NEW_BARK_TOWN", 5, 8, "down")
+  U.wait(20)
+
+  local function run(style, trainer)
+    local done = false
+    game.stack:push(Transition.new(game, {
+      world = world,
+      style = style,
+      trainer = trainer,
+      onDone = function() done = true end,
+    }))
+    -- Shoot the flash sparsely and the outro (the part with the shape in it)
+    -- at every interval, so a nine-shot run is not all palette pulses.
+    local state = game.stack:top()
+    local shots, outroShots = 0, 0
+    for frame = 1, 600 do
+      local outro = state.phase == "outro"
+      local want = outro and (outroShots % interval == 0)
+        or (not outro and frame % 24 == 1)
+      if want then
+        shots = shots + 1
+        U.shot(game, ("%s/%s/%s-%02d.png")
+          :format(out, style, outro and "outro" or "flash", shots))
+      end
+      if outro then outroShots = outroShots + 1 end
+      if done then break end
+      U.wait(1)
+    end
+    print(("[driver] %-8s %d shots, finished=%s")
+      :format(style, shots, tostring(done)))
+    -- The state pops itself; if it did not, take it off so the next run starts
+    -- from a clean stack.
+    if not done then game.stack:pop() end
+    U.wait(5)
+  end
+
+  run("spin", true)
+  run("speckle", false)
+  run("sine", false)
+  run("zoom", false)
+
+  print("[driver] shots in " .. out)
+  love.event.quit()
+end