glIsList — determine if a name corresponds to a display list
Specifies a potential display list name.
list is the name of a display list and returns
GL_FALSE if it is not, or if an error occurs.
A name returned by glGenLists, but not yet associated with a display list by calling glNewList, is not the name of a display list.
GL_INVALID_OPERATION is generated if
glIsList is executed between the execution of glBegin and the corresponding execution of glEnd.
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