本文解析了 OpenGL 中 glUniform 函数的使用特点，强调这些函数不接受程序对象句柄作为参数的原因。它们总是作用于当前通过 glUseProgram 绑定的程序，并解释了统一变量值如何与程序对象关联并保持持久性。
One point worth noting here is that the glUniform* calls do not take a
program object handle as a parameter. The reason for this is because the
glUniform* calls always act on the current program that is bound with
glUseProgram. The uniform values themselves will be kept with the program
object. That is, once you set a uniform to a value in a program object,
that value will remain with it even if you make another program active. In
that sense, we can say that uniform values are local to a program object.
program object handle as a parameter. The reason for this is because the
glUniform* calls always act on the current program that is bound with
glUseProgram. The uniform values themselves will be kept with the program
object. That is, once you set a uniform to a value in a program object,
that value will remain with it even if you make another program active. In
that sense, we can say that uniform values are local to a program object.
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