【性能调优】切图预热：目标地图的资源提前加载

-- 切图预热：接近触发
local player = class(actor)
local PRELOAD_RANGE = 10
local function tryPreload(player, px, py, warpX, warpY, targetMap)
    if math.abs(px - warpX) <= PRELOAD_RANGE and math.abs(py - warpY) <= PRELOAD_RANGE then
        if getplayvar(player, "HUMAN", "Preloaded_" .. targetMap) ~= 1 then
            setplayvar(player, "HUMAN", "Preloaded_" .. targetMap, 1, true)
            SL:SendNetMsg(9994, "preload|" .. targetMap)
            SL:ShowSystemTips("正在准备 " .. targetMap .. " 的地图资源…")
        end
    end
end

-- 预热管理：清单与去重
local player = class(actor)
local PRELOAD_LIST = {
    terrain = "map_tex_pack",
    npc = "npc_cfg_pack",
    effects = "fx_common_pack",
}
local function runPreload(player, targetMap)
    local done = 0
    for _, pack in pairs(PRELOAD_LIST) do
        done = done + 1
        SL:ShowSystemTips("预载资源包 " .. done .. "/3")
    end
    setplayvar(player, "HUMAN", "PreloadDone_" .. targetMap, done, true)
end
local function onWarpDone(player, targetMap)
    setplayvar(player, "HUMAN", "Preloaded_" .. targetMap, 0, true)
    setplayvar(player, "HUMAN", "PreloadDone_" .. targetMap, 0, true)
end