Input should contain any texture coordinates and extra automatic variables needed by surface function.

Input结构中包含所有纹理坐标和surfaceFunction所需的额外的自动变量。

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An area of memory that contains a last-in-first-out queue of storage for parameters, automatic variables, return addresses, and other information that must be maintained across function calls.

一个包含后进先出队列的内存区域，用来存储参数、自动变量、返回地址和其他一些必须在函数调用中进行维护的信息。

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External and static variables are initialized to zero by default. Automatic variables for which is no explicit initializer have undefined (i. e., garbage) values.

外部变量和静态变量初始的时候默认值为零，自动变量在初始的时候是没有默认值的。

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