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feat: add xorshift and rollBelow

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dualfroz committed 2026-09-07 15:51:15 +02:00
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commit 529853153c
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core/src/Enchant.cpp
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#include "vf/Enchant.h"
#include <algorithm>
#include <cmath>
namespace vf {
namespace {
uint32_t xorshift(uint32_t& state) {
state ^= state << 13;
state ^= state >> 17;
state ^= state << 5;
return state;
}
int rollBelow(uint32_t& rng, int bound) {
if (bound <= 1) return 0;
return static_cast<int>(xorshift(rng) % static_cast<uint32_t>(bound));
}
float unitFloat(uint32_t& rng) { return static_cast<float>(xorshift(rng)) / 4294967295.0f; }
bool isProtectionFamily(EnchantKind kind) {
return kind == EnchantKind::Protection || kind == EnchantKind::FireProtection ||
kind == EnchantKind::BlastProtection || kind == EnchantKind::ProjectileProtection;
}
bool isDamageFamily(EnchantKind kind) {
return kind == EnchantKind::Sharpness || kind == EnchantKind::Smite ||
kind == EnchantKind::BaneOfArthropods;
}
bool isArmourTarget(Enchantment::Target target) {
return target == Enchantment::Target::Helmet || target == Enchantment::Target::Chestplate ||
target == Enchantment::Target::Leggings || target == Enchantment::Target::Boots;
}
bool isDiggerTarget(Enchantment::Target target) {
return target == Enchantment::Target::Pickaxe || target == Enchantment::Target::Shovel ||
target == Enchantment::Target::Axe;
}
int levelSpan(int base, int step, int level) { return base + (level - 1) * step; }
} // namespace
int maxEnchantLevel(EnchantKind kind) {
switch (kind) {
case EnchantKind::Protection:
case EnchantKind::FireProtection:
case EnchantKind::BlastProtection:
case EnchantKind::ProjectileProtection:
case EnchantKind::FeatherFalling: return 4;
case EnchantKind::Respiration:
case EnchantKind::Thorns:
case EnchantKind::Looting:
case EnchantKind::Unbreaking:
case EnchantKind::Fortune: return 3;
case EnchantKind::AquaAffinity:
case EnchantKind::SilkTouch:
case EnchantKind::Flame:
case EnchantKind::Infinity:
case EnchantKind::Mending: return 1;
case EnchantKind::Knockback:
case EnchantKind::FireAspect:
case EnchantKind::Punch: return 2;
case EnchantKind::Sharpness:
case EnchantKind::Smite:
case EnchantKind::BaneOfArthropods:
case EnchantKind::Efficiency:
case EnchantKind::Power: return 5;
default: return 1;
}
}
int enchantWeight(EnchantKind kind) {
switch (kind) {
case EnchantKind::Protection:
case EnchantKind::Sharpness:
case EnchantKind::Efficiency:
case EnchantKind::Power: return 10;
case EnchantKind::FireProtection:
case EnchantKind::ProjectileProtection:
case EnchantKind::FeatherFalling:
case EnchantKind::Smite:
case EnchantKind::BaneOfArthropods:
case EnchantKind::Knockback:
case EnchantKind::Unbreaking: return 5;
case EnchantKind::BlastProtection:
case EnchantKind::Respiration:
case EnchantKind::AquaAffinity:
case EnchantKind::FireAspect:
case EnchantKind::Looting:
case EnchantKind::Fortune:
case EnchantKind::Punch:
case EnchantKind::Flame:
case EnchantKind::Mending: return 2;
default: return 1;
}
}
int anvilCostMultiplier(EnchantKind kind) {
switch (enchantWeight(kind)) {
case 10: return 1;
case 5: return 2;
case 2: return 4;
default: return 8;
}
}
int enchantMinCost(EnchantKind kind, int level) {
switch (kind) {
case EnchantKind::Protection: return levelSpan(1, 11, level);
case EnchantKind::FireProtection: return levelSpan(10, 8, level);
case EnchantKind::BlastProtection: return levelSpan(5, 8, level);
case EnchantKind::ProjectileProtection: return levelSpan(3, 6, level);
case EnchantKind::FeatherFalling: return levelSpan(5, 6, level);
case EnchantKind::Respiration: return 10 * level;
case EnchantKind::AquaAffinity: return 1;
case EnchantKind::Thorns: return levelSpan(10, 20, level);
case EnchantKind::Sharpness: return levelSpan(1, 11, level);
case EnchantKind::Smite: return levelSpan(5, 8, level);
case EnchantKind::BaneOfArthropods: return levelSpan(5, 8, level);
case EnchantKind::Knockback: return levelSpan(5, 20, level);
case EnchantKind::FireAspect: return levelSpan(10, 20, level);
case EnchantKind::Looting: return levelSpan(15, 9, level);
case EnchantKind::Efficiency: return levelSpan(1, 10, level);
case EnchantKind::SilkTouch: return 15;
case EnchantKind::Unbreaking: return levelSpan(5, 8, level);
case EnchantKind::Fortune: return levelSpan(15, 9, level);
case EnchantKind::Power: return levelSpan(1, 10, level);
case EnchantKind::Punch: return levelSpan(12, 20, level);
case EnchantKind::Flame: return 20;
case EnchantKind::Infinity: return 20;
case EnchantKind::Mending: return 25 * level;
default: return 1;
}
}
int enchantMaxCost(EnchantKind kind, int level) {
switch (kind) {
case EnchantKind::Protection: return enchantMinCost(kind, level) + 11;
case EnchantKind::FireProtection:
case EnchantKind::BlastProtection: return enchantMinCost(kind, level) + 8;
case EnchantKind::ProjectileProtection:
case EnchantKind::FeatherFalling: return enchantMinCost(kind, level) + 6;
case EnchantKind::Respiration: return enchantMinCost(kind, level) + 30;
case EnchantKind::AquaAffinity: return 41;
case EnchantKind::Sharpness:
case EnchantKind::Smite:
case EnchantKind::BaneOfArthropods: return enchantMinCost(kind, level) + 20;
case EnchantKind::Power: return enchantMinCost(kind, level) + 15;
case EnchantKind::Punch: return enchantMinCost(kind, level) + 25;
default: return enchantMinCost(kind, level) + 50;
}
}