test: cover seedFor and contextWith
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dualfroz committed
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#include <algorithm>
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#include "testHarness.h"
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#include "vf/Loot.h"
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using namespace vf;
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namespace {
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// Consecutive small seeds share too much structure for a raw xorshift stream,
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// so the sampling tests walk a scrambled sequence instead.
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uint32_t seedFor(int index) {
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uint32_t mixed = static_cast<uint32_t>(index) + 1u;
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mixed ^= mixed >> 16;
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mixed *= 0x7feb352du;
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mixed ^= mixed >> 15;
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mixed *= 0x846ca68bu;
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mixed ^= mixed >> 16;
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return mixed == 0u ? 1u : mixed;
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}
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LootContext contextWith(ItemId tool, uint32_t seed) {
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LootContext context;
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context.tool = tool;
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context.seed = seed;
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return context;
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}
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LootContext enchanted(ItemId tool, EnchantKind kind, int level, uint32_t seed) {
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LootContext context = contextWith(tool, seed);
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addEnchant(context.toolEnchants, kind, level);
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return context;
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}
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LootContext killContext(bool byPlayer, uint32_t seed) {
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LootContext context = contextWith(ItemId::IronSword, seed);
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context.playerKill = byPlayer;
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return context;
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}
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bool sameRoll(const LootRoll& left, const LootRoll& right) {
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if (left.items.size() != right.items.size()) return false;
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for (std::size_t i = 0; i < left.items.size(); ++i) {
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if (left.items[i].item != right.items[i].item) return false;
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if (left.items[i].count != right.items[i].count) return false;
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if (left.items[i].durability != right.items[i].durability) return false;
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}
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return true;
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}
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LootEntry entryOf(ItemId item, uint32_t conditions) {
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LootEntry entry;
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entry.item = item;
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entry.conditions = conditions;
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return entry;
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}
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LootTable singlePool(const std::vector<LootEntry>& entries, int minRolls = 1, int maxRolls = 1) {
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LootPool pool;
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pool.entries = entries;
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pool.minRolls = minRolls;
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pool.maxRolls = maxRolls;
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LootTable table;
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table.pools.push_back(pool);
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return table;
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}
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int maxOverSeeds(Block block, const EnchantSet& enchants, ItemId tool, ItemId wanted, int samples) {
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int best = 0;
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for (int i = 0; i < samples; ++i) {
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LootContext context = contextWith(tool, seedFor(i));
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context.toolEnchants = enchants;
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best = std::max(best, rollBlockDrops(block, context).countOf(wanted));
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}
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return best;
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}
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} // namespace
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VF_TEST(theSameSeedAlwaysReproducesTheSameRollAcrossEveryTableFamily) {
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LootContext blockContext = enchanted(ItemId::DiamondPickaxe, EnchantKind::Fortune, 3, 0xabcdef01u);
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CHECK(sameRoll(rollBlockDrops(Block::LapisOre, blockContext),
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rollBlockDrops(Block::LapisOre, blockContext)));
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LootContext mobContext = killContext(true, 0x1234567u);
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addEnchant(mobContext.toolEnchants, EnchantKind::Looting, 2);
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CHECK(sameRoll(rollMobDrops(LootTable::MobKind::Zombie, mobContext),
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rollMobDrops(LootTable::MobKind::Zombie, mobContext)));
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LootContext chestContext = contextWith(ItemId::None, 0x55aa33ccu);
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LootRoll first = rollChestContents(LootTable::ChestKind::Dungeon, chestContext);
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LootRoll second = rollChestContents(LootTable::ChestKind::Dungeon, chestContext);
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CHECK(sameRoll(first, second));
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CHECK(first.totalCount() > 0);
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}
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VF_TEST(differentSeedsPullApartTheContentsOfTheSameChest) {
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LootRoll reference = rollChestContents(LootTable::ChestKind::Dungeon,
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contextWith(ItemId::None, seedFor(0)));
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int different = 0;
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for (int i = 1; i < 64; ++i) {
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LootRoll roll = rollChestContents(LootTable::ChestKind::Dungeon,
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contextWith(ItemId::None, seedFor(i)));
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if (!sameRoll(reference, roll)) ++different;
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}
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CHECK(different >= 55);
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}
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VF_TEST(stoneDropsCobblestoneUnlessTheSilkTouchBranchTakesOver) {
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LootContext plain = contextWith(ItemId::StonePickaxe, 7u);
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LootRoll broken = rollBlockDrops(Block::Stone, plain);
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CHECK_EQ(broken.countOf(ItemId::Cobblestone), 1);
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CHECK_EQ(broken.countOf(ItemId::Stone), 0);
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LootContext silk = enchanted(ItemId::StonePickaxe, EnchantKind::SilkTouch, 1, 7u);
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LootRoll harvested = rollBlockDrops(Block::Stone, silk);
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CHECK_EQ(harvested.countOf(ItemId::Stone), 1);
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CHECK_EQ(harvested.countOf(ItemId::Cobblestone), 0);
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}
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VF_TEST(oresDropTheirRawFormAndSilkTouchDropsTheOreBlockItself) {
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const struct { Block block; ItemId raw; ItemId oreItem; } ores[] = {
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{Block::CoalOre, ItemId::CoalLump, ItemId::CoalOre},
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{Block::IronOre, ItemId::IronOre, ItemId::IronOre},
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{Block::DiamondOre, ItemId::DiamondGem, ItemId::DiamondOre},
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{Block::EmeraldOre, ItemId::EmeraldGem, ItemId::EmeraldOre},
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};
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for (const auto& ore : ores) {
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LootContext plain = contextWith(ItemId::DiamondPickaxe, 31u);
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CHECK_EQ(rollBlockDrops(ore.block, plain).countOf(ore.raw), 1);
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LootContext silk = enchanted(ItemId::DiamondPickaxe, EnchantKind::SilkTouch, 1, 31u);
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LootRoll harvested = rollBlockDrops(ore.block, silk);
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CHECK_EQ(harvested.countOf(ore.oreItem), 1);
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CHECK_EQ(harvested.totalCount(), 1);
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}
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}
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VF_TEST(fortuneMultipliesOreDropsAndNeverDropsBelowTheBaseYield) {
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EnchantSet bare;
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EnchantSet fortune;
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addEnchant(fortune, EnchantKind::Fortune, 3);
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int worstPlain = 99;
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int worstFortune = 99;
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for (int i = 0; i < 400; ++i) {
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LootContext plain = contextWith(ItemId::DiamondPickaxe, seedFor(i));
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worstPlain = std::min(worstPlain, rollBlockDrops(Block::DiamondOre, plain)
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.countOf(ItemId::DiamondGem));
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LootContext lucky = contextWith(ItemId::DiamondPickaxe, seedFor(i));
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lucky.toolEnchants = fortune;
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worstFortune = std::min(worstFortune, rollBlockDrops(Block::DiamondOre, lucky)
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.countOf(ItemId::DiamondGem));
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}
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CHECK_EQ(worstPlain, 1);
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CHECK_EQ(worstFortune, 1);
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