If this variable (default 1) is set
to 0, warnings about texture, entity sizes and bad
instructions are never issued. If it is set to 2 or above, warnings about possible
script or texture size problems are always issued - even if the current 3D
card can display them. This is useful if you want to check whether your textures
to be displayed even on other people's 3D cards.
0 - no warning messages.
1 - warnings about problems with
some hardware configurations (default).
2 - warnings about bad texture sizes and wrong parameters in engine functions.
3 - warnings about missing files in file functions.
4..6 - even more warnings.
warn_level = 3; // should be standard for testing