That code from the 1st line was most likely converted from existing graphics code in C

Can you rewrite it in a way that's readable, performant and understandable/maintainable to someone with an understanding of the knowledge domain?

I agree, the code is ugly. I disagree it would be better if converted to some OOP hierarchy, it would be probably less understandable even if the code was tidier

Code like

    SnarfleBlaster = new SnarfleBlaster();
    SnuggleNerfer = new SnuggleNerfer();
    Guffles guffles = SnarfleBlaster->Blast();
    SnuggleNerfer->Tumbles(guffles);

Is tidy but absolutely dense