What about the types int2, int3, float2, float3 etc

Question

I\'ve seen different code snippets using these types, but I haven\'t seen if they are defined in some or just defined in a \"local header file\"

Answer 1

AFAIK there is no standard header file that defines these types. According to your description int2 means a pair of two ints which can be represented in C++ as std::pair.