When spawing quest items (e.g. blood stone), no unique seed is set
for the item. Therefor two quest items may share the same seed, this
happens deterministically for the Valor quest, since three blood stones
are spawned, each with item seed 0x00000000.
For this reason, if two or more such quest items with identical seed are
looted within less than 6 seconds, the 2nd, 3rd, etc loot actions are
ignored.
The item get record array tracks items being recently looted in an
effort to prevent the same item from being looted more than once.
Prior to this commit, the item get record array (and corresponding
item get record array length) variables were not cleared when
creating a new game. Therefore, the item get record array of a
previous game could remain in between games and prevent an item
from being looted (if it was looted in a previous), even if it was
never looted in the current game. In practice this almost never
shows up, since each item get record is valid for a total of 6
seconds before being cleared. So, you would either have to save
a game, quickly loot an item, when load the game and try to loot
the same item before 6 seconds pass. OR, you could use the demo
replay functionality to run test cases, and speed up execution to
run e.g. 10'000'000 logic ticks per second. Both would exhibit the
bug and prevent the item from being looted.
ref: diasurgical/devilutionX#2691
Robin Eklind
Anders Jenbo
Robin
Martin Wolters
qndel
Gleb Mazovetskiy
pionere
Tyler