Co-creator with @julian_gollop of Chip 'n Clawz Prev Silent Hill 2, Brink, Heavenly Sword, Phoenix Point, Apple Wheelchair and crutch user. Game dev since last century.
![namespace Core
{
// FNV-1a 32bit hashing algorithm.
constexpr uint32_t CompileTimeHash(size_t count, char const* s) {
return ((count > 1 ? CompileTimeHash(count - 1, s) : 2166136261ul) ^ s[count - 1]) * 16777619ul;
}
// FNV-1a 32 bit hash without a multiple and non-recursive which might be faster?
inline uint32_t RuntimeHash(size_t count, FString::ElementType const* s) {
uint32_t hash = 2166136261ul;
for (size_t i = 0; i < count; ++i) {
hash ^= (char)s[i]; // ensure we only use the bottom 8 bits even if FString is wide
hash += (hash << 1) + (hash << 4) + (hash << 7) + (hash << 8) + (hash << 24);
}
return hash;
}
inline uint32_t RuntimeHash(FString const& s) {
return RuntimeHash(s.Len(), *s);
}
}
constexpr uint32_t operator"" _hash(char const* s, size_t count) {
return Core::CompileTimeHash(count, s);
}
// example
switch (uint32_t) {
case "WhateverYouLike"_hash: return "Woot!";
default: return "boo!";
}](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:b4uxepavbfgrhd64qkdmw7a5/bafkreig2cnve3wbkmh34nhcpeofgvtkzyxioi7vtkx6yjjeqrycgjmiu4i)
Co-creator with @julian_gollop of Chip 'n Clawz Prev Silent Hill 2, Brink, Heavenly Sword, Phoenix Point, Apple Wheelchair and crutch user. Game dev since last century.