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。
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。
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。
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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