move Void RNG functions

eid_api.lua

@@ -922,6 +922,71 @@ function EID:CheckGlitchedItemConfig(id)
 	return attributes
 end
 
+-- Void stat prediction helper functions (called from eid_modifiers when needed)
+-- Didn't seem right to put them in main or eid_modifiers
+local numVoidable = 0
+local numRunable = 0
+local function VoidRNGNext(num)
+	num = num ~ ((num >> 5) & 4294967295)
+	num = num ~ ((num << 9) & 4294967295)
+	num = num ~ ((num >> 7) & 4294967295)
+	return num >> 0;
+end
+local function GetTwoIncreases(rng, tbl)
+	local statTable = {1,2,3,4,5,6}
+	-- perform 5 random swaps of our stat table
+	for i = 6, 2, -1 do
+		rng = VoidRNGNext(rng)
+		local result = (rng % i) + 1
+		local temp = statTable[i]
+		statTable[i] = statTable[result]
+		statTable[result] = temp
+	end
+	-- the first two entries in the stat table get increased
+	tbl[statTable[1]] = tbl[statTable[1]] + 1
+	tbl[statTable[2]] = tbl[statTable[2]] + 1
+	return rng
+end
+-- Count the number of absorbable pedestals in the room
+function EID:VoidRoomCheck()
+	numVoidable = 0
+	numRunable = 0
+	EID.VoidOptionIndexes = {}
+	for _, entity in ipairs(Isaac.FindByType(5, 100, -1, true, false)) do
+		local pickup = entity:ToPickup()
+		-- Count this pedestal if it's not an active (or this is Black Rune), not a shop item, and (in Repentance) the first of its option index
+		-- TEST IF VOID ALWAYS ABSORBS THE FIRST OF ITS OPTION INDEX
+		if entity.SubType > 0 and not pickup:IsShopItem() and
+		(not REPENTANCE or pickup.OptionsPickupIndex == 0 or EID.VoidOptionIndexes[pickup.OptionsPickupIndex] == nil) then
+			numRunable = numRunable + 1
+			EID.VoidOptionIndexes[pickup.OptionsPickupIndex] = entity.SubType
+			if (EID.itemConfig:GetCollectible(entity.SubType).Type ~= ItemType.ITEM_ACTIVE) then numVoidable = numVoidable + 1 end
+		end
+	end
+end
+-- Determine what stats will be increased after 1 absorption, the whole room's absorption, and whole room + a purchased item above your head
+function EID:VoidRNGCheck(player, isRune)
+	local increases = {0, 0, 0, 0, 0, 0}
+	local shopItemIncreases = {}; local singleIncreases = {}
+	
+	local startRNG = (isRune and player:GetCardRNG(Card.RUNE_BLACK):GetSeed()) or player:GetCollectibleRNG(CollectibleType.COLLECTIBLE_VOID):GetSeed()
+	local count = (isRune and numRunable) or numVoidable
+	local eidTable = (isRune and EID.BlackRuneStatIncreases) or EID.VoidStatIncreases
+	
+	-- in Repentance, an additional RNG call is done before the 5 for stat ups when using Void
+	if REPENTANCE and not isRune then startRNG = VoidRNGNext(startRNG) end
+	for i = 1, count do
+		startRNG = GetTwoIncreases(startRNG, increases)
+		if i == 1 then eidTable[3] = {table.unpack(increases)} end
+	end
+	eidTable[1] = {table.unpack(increases)}
+	-- do an extra check for what you'd get if you Void with a shop item above your head
+	GetTwoIncreases(startRNG, increases)
+	eidTable[2] = {table.unpack(increases)}
+	-- if there were no absorbable pedestals, the "single increase" stats are the same as the "one extra" stats
+	if count == 0 then eidTable[3] = {table.unpack(increases)} end
+end
+
 -- Converts a given CollectibleID into the respective Spindown dice result
 function EID:getSpindownResult(collectibleID)
 	if collectibleID <= 0 or collectibleID > 4294960000 then return 0 end