glGetBufferPointerv returns pointer information. pname is a symbolic constant indicating the pointer to be returned, which must be GL_BUFFER_MAP_POINTER, the pointer to which the buffer object's data store is mapped. If the data store is not currently mapped, null is returned. params is a pointer to a location in which to place the returned pointer value.
If an error is generated, no change is made to the contents of params. The initial value for the pointer is null.
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glGetBufferPointerv: man3/glGetBufferPointerv.xml
glGetBufferPointerv returns pointer information. pname is a symbolic constant indicating the pointer to be returned, which must be GL_BUFFER_MAP_POINTER, the pointer to which the buffer object's data store is mapped. If the data store is not currently mapped, null is returned. params is a pointer to a location in which to place the returned pointer value.
If an error is generated, no change is made to the contents of params. The initial value for the pointer is null.