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update comments in expand_rate

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Martin Michelsen
2025-08-13 11:51:35 -07:00
parent 49fb7eba60
commit 16bff52575
1 changed files with 3 additions and 4 deletions
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src/RareItemSet.cc
+3 -4
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@@ -28,11 +28,10 @@ string RareItemSet::ExpandedDrop::str(shared_ptr<const ItemNameIndex> name_index
} }
uint32_t RareItemSet::expand_rate(uint8_t pc) { uint32_t RareItemSet::expand_rate(uint8_t pc) {
// To compute the actual drop rare drop rate from pc, first decode pc into // To compute the actual rare drop rate from pc, first decode pc:
// shift and value:
// pc = bits SSSSSVVV // pc = bits SSSSSVVV
// shift = S - 4 (so shift is 0-27) // shift = S - 4 (so shift is 0-27)
// value = V + 7 (so value is 7-14) // value = V + 7 (so value is 7-14)
// Then, take the value 0x00000002, shift it left by shift (0-27), and // Then, take the value 0x00000002, shift it left by shift (0-27), and
// multiply the result by value (7-14) to get the actual drop rate. The result // multiply the result by value (7-14) to get the actual drop rate. The result
// is a probability out of 0xFFFFFFFF (so 0x40000000 means the item will drop // is a probability out of 0xFFFFFFFF (so 0x40000000 means the item will drop