[LayaAirIDE 2.0]设置遮罩会导致内存大大增高

WebGLRTMgr.releaseRT

WebGLRTMgr.releaseRT=function(rt){

    if (rt._mgrKey <=0)

        return;

    rt._disposeResource();// ++ 删除贴图

    return;               // ++ 返回，下面的不做了

drawTriangles(texture:Texture, x:number, y:number,

    vertices:Float32Array,

    uvs:Float32Array,

    indices:Uint16Array,

    matrix:Matrix = null, alpha:number = 1, color:string = null, blendMode:string = null)