using UnityEngine;
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using System.Collections;
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using XLua;
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[GCOptimize(OptimizeFlag.PackAsTable)]
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public struct PushAsTableStruct
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{
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public int x;
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public int y;
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}
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public class ReImplementInLua : MonoBehaviour {
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// Use this for initialization
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void Start () {
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LuaEnv luaenv = new LuaEnv();
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//这两个例子都必须生成代码才能正常运行
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//例子1：改造Vector3
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//沿用Vector3原来的映射方案Vector3 -> userdata，但是把Vector3的方法实现改为lua实现，通过xlua.genaccessor实现不经过C#直接操作内存
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//改为不经过C#的好处是性能更高，而且你可以省掉相应的生成代码以达成省text段的效果
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//仍然沿用映射方案的好处是userdata比table更省内存，但操作字段比table性能稍低，当然，你也可以结合例子2的思路，把Vector3也改为映射到table
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luaenv.DoString(@"
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function test_vector3(title, v1, v2)
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print(title)
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print(v1.x, v1.y, v1.z)
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print(v1, v2)
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print(v1 + v2)
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v1:Set(v1.x - v2.x, v1.y - v2.y, v1.z - v2.z)
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print(v1)
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print(CS.UnityEngine.Vector3.Normalize(v1))
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end
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test_vector3('----before change metatable----', CS.UnityEngine.Vector3(1, 2, 3), CS.UnityEngine.Vector3(7, 8, 9))
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local get_x, set_x = xlua.genaccessor(0, 8)
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local get_y, set_y = xlua.genaccessor(4, 8)
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local get_z, set_z = xlua.genaccessor(8, 8)
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local fields_getters = {
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x = get_x, y = get_y, z = get_z
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}
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local fields_setters = {
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x = set_x, y = set_y, z = set_z
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}
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local ins_methods = {
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Set = function(o, x, y, z)
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set_x(o, x)
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set_y(o, y)
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set_z(o, z)
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end
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}
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local mt = {
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__index = function(o, k)
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--print('__index', k)
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if ins_methods[k] then return ins_methods[k] end
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return fields_getters[k] and fields_getters[k](o)
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end,
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__newindex = function(o, k, v)
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return fields_setters[k] and fields_setters[k](o, v) or error('no such field ' .. k)
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end,
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__tostring = function(o)
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return string.format('vector3 { %f, %f, %f}', o.x, o.y, o.z)
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end,
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__add = function(a, b)
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return CS.UnityEngine.Vector3(a.x + b.x, a.y + b.y, a.z + b.z)
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end
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}
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xlua.setmetatable(CS.UnityEngine.Vector3, mt)
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test_vector3('----after change metatable----', CS.UnityEngine.Vector3(1, 2, 3), CS.UnityEngine.Vector3(7, 8, 9))
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");
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Debug.Log("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
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//例子2：struct映射到table改造
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//PushAsTableStruct传送到lua侧将会是table，例子里头还为这个table添加了一个成员方法SwapXY，静态方法Print，打印格式化，以及构造函数
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luaenv.DoString(@"
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local mt = {
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__index = {
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SwapXY = function(o) --成员函数
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o.x, o.y = o.y, o.x
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end
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},
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__tostring = function(o) --打印格式化函数
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return string.format('struct { %d, %d}', o.x, o.y)
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end,
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}
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xlua.setmetatable(CS.PushAsTableStruct, mt)
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local PushAsTableStruct = {
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Print = function(o) --静态函数
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print(o.x, o.y)
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end
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}
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setmetatable(PushAsTableStruct, {
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__call = function(_, x, y) --构造函数
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return setmetatable({x = x, y = y}, mt)
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end
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})
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xlua.setclass(CS, 'PushAsTableStruct', PushAsTableStruct)
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");
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PushAsTableStruct test;
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test.x = 100;
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test.y = 200;
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luaenv.Global.Set("from_cs", test);
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luaenv.DoString(@"
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print('--------------from csharp---------------------')
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assert(type(from_cs) == 'table')
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print(from_cs)
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CS.PushAsTableStruct.Print(from_cs)
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from_cs:SwapXY()
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print(from_cs)
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print('--------------from lua---------------------')
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local from_lua = CS.PushAsTableStruct(4, 5)
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assert(type(from_lua) == 'table')
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print(from_lua)
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CS.PushAsTableStruct.Print(from_lua)
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from_lua:SwapXY()
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print(from_lua)
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");
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luaenv.Dispose();
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}
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// Update is called once per frame
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void Update () {
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}
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}
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