智能杂货铺

``` function test(i):Promise { return new Promise((resolve,reject)=>{ console.log("test ",i); return resolve(i); }); } function test2(i):number { return i; } fo

## clamp 获取x和minval之间较大的值，然后再结果值与最后的最大值比较取最小值 ``` float clamp(float x, float minVal, float maxVal) vec2 clamp(vec2 x, vec2 minVal, vec2 maxVal) vec3 clamp(vec3 x, vec3 minVal, vec3 maxVal) vec