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graph LR
    A[Unloaded] -->|Load| B[Loading]
    B -->|Success| C[Loaded]
    C -->|Init| D[Initialized]
    D -->|Enable| E[Active]
    E -->|Disable| D
    D -->|Unload| A

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local proxy_id = collectionproxy.create("#level1")
collectionproxy.load(proxy_id)  -- 阻塞直到加载完成
local root_url = msg.url(proxy_id, "root", nil)
msg.post(root_url, "enable")

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local function load_callback(self, proxy_id, status)
    if status == collectionproxy.STATUS_LOADED then
        collectionproxy.init(proxy_id)
    end
end

collectionproxy.load_async("#level2", load_callback)

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resources.set_priority("/level1/background.texturec", 100)  -- 最高优先级
resources.set_priority("/level1/decorations.atlasc", 50)

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local LOAD_BUDGET = 5  -- 每帧最多加载5个资源
function update_loading(self)
    local remaining = resources.load_pending()
    for i=1, math.min(LOAD_BUDGET, remaining) do
        resources.load_next()
    end
end

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SceneManager = {
    current = nil,    -- 当前活动场景
    pending = nil,    -- 准备中的场景
    transition = {
        duration = 1.0,
        progress = 0.0
    }
}

function switch_scene(target)
    if SceneManager.pending then return end
    
    SceneManager.pending = collectionproxy.create(target)
    collectionproxy.load_async(SceneManager.pending, function()
        collectionproxy.init(SceneManager.pending)
        start_transition()
    end)
end

function start_transition()
    go.animate(".", "transition.progress", go.PLAYBACK_ONCE_FORWARD, 1.0, 
               go.EASING_INOUTQUAD, SceneManager.transition.duration)
end

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-- 淡入淡出Shader
local fade_shader = """
varying vec2 v_texcoord0;
uniform sampler2D texture_sampler;
uniform float alpha;

void main()
{
    vec4 color = texture2D(texture_sampler, v_texcoord0);
    color.a *= alpha;
    gl_FragColor = color;
}
"""

function update_transition()
    local alpha = 1.0 - SceneManager.transition.progress
    render.set_constant("/transition#quad", "alpha", alpha)
end

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GameState = {
    player = {
        health = 100,
        inventory = {}
    },
    levels = {
        level1 = { completed = false, score = 0 },
        level2 = { locked = true }
    }
}

function save_scene_state(scene_id)
    GameState.scenes[scene_id] = {
        objects = collection.serialize(proxy.get_root(scene_id))
    }
end

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function serialize_gameobject(go_id)
    return {
        position = go.get_position(go_id),
        components = {
            health = go.get(go_id, "health"),
            -- 其他需要保存的组件状态
        }
    }
end

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local RESOURCE_REF = {}

function track_resources(proxy_id)
    local manifest = collectionproxy.get_manifest(proxy_id)
    for _, res in ipairs(manifest) do
        RESOURCE_REF[res.path] = (RESOURCE_REF[res.path] or 0) + 1
    end
end

function release_resources(proxy_id)
    local manifest = collectionproxy.get_manifest(proxy_id)
    for _, res in ipairs(manifest) do
        RESOURCE_REF[res.path] = RESOURCE_REF[res.path] - 1
        if RESOURCE_REF[res.path] <= 0 then
            resources.unload(res.path)
        end
    end
end

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ObjectPool = {
    pools = {},
    acquire = function(self, prototype)
        if not self.pools[prototype] then
            self.pools[prototype] = {}
        end
        
        if #self.pools[prototype] > 0 then
            return table.remove(self.pools[prototype])
        else
            return factory.create(prototype)
        end
    end,
    release = function(self, obj)
        go.set_position(vmath.vector3(0), obj)
        table.insert(self.pools[obj.prototype], obj)
    end
}

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WorldChunk = {
    size = 1024,  -- 区块尺寸（像素）
    loaded = {},
    update = function(self, player_pos)
        local chunk_x = math.floor(player_pos.x / self.size)
        local chunk_y = math.floor(player_pos.y / self.size)
        
        -- 卸载视野外区块
        for coord, proxy_id in pairs(self.loaded) do
            if math.abs(coord.x - chunk_x) > 1 or 
               math.abs(coord.y - chunk_y) > 1 then
                collectionproxy.unload(proxy_id)
                self.loaded[coord] = nil
            end
        end
        
        -- 加载新区块
        for dx=-1,1 do
            for dy=-1,1 do
                local coord = {x=chunk_x+dx, y=chunk_y+dy}
                if not self.loaded[coord] then
                    local proxy_id = collectionproxy.create(chunk_to_path(coord))
                    collectionproxy.load_async(proxy_id)
                    self.loaded[coord] = proxy_id
                end
            end
        end
    end
}

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ResourceStreamer = {
    visibility_radius = 500,
    pending = {},
    update = function(self, center)
        -- 计算可见区域资源
        local visible = calculate_visible_resources(center)
        
        -- 卸载不可见资源
        for path, ref in pairs(RESOURCE_REF) do
            if not visible[path] and ref.count == 0 then
                resources.unload(path)
            end
        end
        
        -- 加载高优先级资源
        table.sort(self.pending, function(a,b) return a.priority > b.priority end)
        for i=1, math.min(5, #self.pending) do
            resources.load_async(self.pending[i].path)
        end
    end
}

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Profiler = {
    timings = {},
    begin = function(self, tag)
        self.timings[tag] = socket.gettime()
    end,
    end = function(self, tag)
        if self.timings[tag] then
            local duration = (socket.gettime() - self.timings[tag]) * 1000
            print(string.format("[PROFILER] %s: %.2fms", tag, duration))
        end
    end
}

function load_scene()
    Profiler:begin("scene_load")
    -- 加载逻辑...
    Profiler:end("scene_load")
end

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function draw_debug_overlay()
    imgui.Begin("Memory Monitor")
    
    -- 显示场景内存占用
    imgui.Text("Active Scenes:")
    for proxy_id, _ in pairs(active_proxies) do
        local mem = collectionproxy.get_memory_usage(proxy_id)
        imgui.Text(string.format("%s: %.2f MB", 
            collectionproxy.get_id(proxy_id), mem / 1024 / 1024))
    end
    
    -- 资源引用统计
    imgui.Separator()
    imgui.Text("Resource References:")
    for path, count in pairs(RESOURCE_REF) do
        if count > 0 then
            imgui.Text(string.format("%s: %d", path, count))
        end
    end
    
    imgui.End()
end

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TerrainManager = {
    sectors = {},
    load_sector = function(self, x, y)
        local sector_id = string.format("sector_%d_%d", x, y)
        if not self.sectors[sector_id] then
            local proxy = collectionproxy.create("#sector_template")
            collectionproxy.load_async(proxy, function()
                local root = collectionproxy.get_root(proxy)
                terrain.apply_heightmap(root, x, y)
                collectionproxy.init(proxy)
                self.sectors[sector_id] = proxy
            end)
        end
    end,
    update = function(self, player_pos)
        local sector_size = 2048
        local current_x = math.floor(player_pos.x / sector_size)
        local current_y = math.floor(player_pos.y / sector_size)
        
        -- 加载周围3x3区域
        for dx=-1,1 do
            for dy=-1,1 do
                self:load_sector(current_x + dx, current_y + dy)
            end
        end
    end
}

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SceneEventSystem = {
    listeners = {},
    register = function(self, event_type, callback)
        self.listeners[event_type] = self.listeners[event_type] or {}
        table.insert(self.listeners[event_type], callback)
    end,
    trigger = function(self, event_type, data)
        local handlers = self.listeners[event_type] or {}
        for _, handler in ipairs(handlers) do
            handler(data)
        end
    end
}

-- 场景切换事件监听
SceneEventSystem:register("scene_pre_unload", function(data)
    save_scene_state(data.scene_id)
    resources.unload_unused()
end)

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; game.project 配置
[memory]
texture_compression = astc
mesh_compression_level = 2
animation_quantization = 1

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function platform_specific_optimization()
    if sys.get_platform() == "PS5" then
        -- 启用快速加载技术
        collectionproxy.set_loading_policy("#background", "high_priority")
        render.enable_ssd_streaming(true)
    elseif sys.get_platform() == "Switch" then
        -- 降低纹理分辨率
        resources.set_variant("mobile_low")
    end
end