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zero2_drop_predict.lua
432 downloads
Uploaded 7/21/2020 10:48 AM by hellagels (see all 14)
For Japanese version only
--[[This script is for Rockman Zero 2 Japanese version only. 
Created by hellagels]]

--color for drop prediction
nothing = "white"
smallHP = 0x60FF0000
largeHP = "red"
fullHP = "black"
smallEC = 0x600000FF
largeEC = "blue"
extralife = "green"

--key for RNG cheating
RNG_forward = "Keypad2"
RNG_backward = "Keypad1"

-------------------------------------------------------------------------

function mul32(a, b)
	-- separate the value into two 16-bit values to prevent type casting
	local x, y, z = {}, {}, {}
	x[1] = bit.band(a, 0xffff)
	x[2] = bit.band(bit.rshift(a, 16), 0xffff)
	y[1] = bit.band(b, 0xffff)
	y[2] = bit.band(bit.rshift(b, 16), 0xffff)
	-- calculate for each halfword
	local v, c
	v = x[1] * y[1]
	z[1], c = bit.band(v, 0xffff), bit.rshift(v, 16)
	v = c + x[2] * y[1] + x[1] * y[2]
	z[2], c = bit.band(v, 0xffff), bit.rshift(v, 16)
	-- compose them and return it
	return bit.bor(z[1], bit.lshift(z[2], 16))
end

function add32(a, b)
	return bit.band(a + b, 0xFFFFFFFF) 
end

client.SetGameExtraPadding(0, 0, 64, 0)

color = {
smallHP	,
largeHP	,
fullHP	,
smallEC	,
largeEC	,
extralife	}

multiplier = {
968044885	,
1616881209	,
171702449	,
1731029601	,
542013633	,
244416897	,
296043265	,
315852289	,
1338706945	,
673585153	,
1921789953	,
1847091201	,
3194881	,
274825217	,
1623392257	,
1099300865	,
51118081	,
102236161	,
204472321	,
408944641	,
817889281	,
1635778561	,
1124073473	,
100663297	,
201326593	,
402653185	,
805306369	,
1610612737	,
1073741825	,
1	,
1	}

adder = {
561051201	,
59255510	,
1040873596	,
1687414328	,
1036603760	,
14431968	,
1012579776	,
1159641984	,
719484672	,
1348005376	,
1258413056	,
1061402624	,
596078592	,
1527701504	,
102612992	,
1278967808	,
410451968	,
820903936	,
1641807872	,
1136132096	,
124780544	,
249561088	,
499122176	,
998244352	,
1996488704	,
1845493760	,
1543503872	,
939524096	,
1879048192	,
1610612736	,
1073741824	}

local RNG_backward_frame = 0
local RNG_forward_frame = 0

function RNG_alter()
	user_input = input.get()
	current_RNG = memory.read_u32_le(0x02E188,"EWRAM")
	if user_input[RNG_backward] then
		RNG_backward_frame = RNG_backward_frame + 1
	else
		RNG_backward_frame = 0
	end
	if RNG_backward_frame == 1 then
		memory.write_u32_le(0x02E188, add32(mul32(current_RNG,0x39B33155),0x2170F641)%0x80000000,"EWRAM")
	end
	if user_input[RNG_forward] then
		RNG_forward_frame = RNG_forward_frame + 1
	else
		RNG_forward_frame = 0
	end
	if RNG_forward_frame == 1 then
		memory.write_u32_le(0x02E188, add32(mul32(current_RNG,0x000343FD),0x00269EC3)%0x80000000,"EWRAM")
	end
end

pool_parameter = {}
for i = 0, 55 do
	pool_parameter[i] = memory.read_u16_le(0x33266C + 2 * i,"ROM")
end

function get_RNG_table()
	local tbl = {}
	tbl[0] = memory.read_u32_le(0x02E188,"EWRAM")
	for i=1,50 do
		tbl[i] = add32(mul32(tbl[i-1],0x000343FD),0x00269EC3)%0x80000000
	end
	return tbl
end

function predict()
	for pool_ID = 1,5 do
		gui.drawBox(234+pool_ID*12,149,239+pool_ID*12,50,nothing, nothing)
		gui.pixelText(235+pool_ID*12, 150, pool_ID)
		local RNG_table = get_RNG_table()
		for k = 1,50 do
			local RNG_chipped = bit.rshift(bit.band(RNG_table[k], 0x00FF0000),16)
			for j = 0, 6 do
				if RNG_chipped < pool_parameter[pool_ID * 7 + j] then
					item = j
					break
				end
			end
			if item > 0 then
				gui.drawBox(234+pool_ID*12,151-k*2,239+pool_ID*12,150-k*2,color[item], color[item])
			end
		end
	end
end

--algorithms by KSeptuple
function get_RNG_step(RNG)
	local result = 0
	for i = 1, 31 do
		if bit.rshift(RNG, i - 1) % 2 == 1 then
			RNG = add32(mul32(RNG, multiplier[i]), adder[i])
			result = add32(result, bit.lshift(1, i - 1))
			if RNG == 0 then
				break
			end
		end
	end
	return result
end

substacter = {}
for i = 0x00, 0x20 do
	substacter[i] = get_RNG_step(i)
end

function detect_pool()
	pool = emu.getregister("R3")
	gui.addmessage("Pool "..pool)
end

event.onmemoryexecute(detect_pool,0x0801DDE2)

while true do
	RNG_alter()
	RNG_string = string.format("%X",memory.read_u32_le(0x02E188,"EWRAM"))
	gui.pixelText(242,8,"RNG: "..string.rep("0",8-string.len(RNG_string))..RNG_string)
	map = memory.read_u32_le(0x036B34,"EWRAM")
	gui.pixelText(242,16,"MAP: "..string.format("%X",map))
	signed_RNG_step = (get_RNG_step(memory.read_u32_le(0x02E188,"EWRAM"))-substacter[map])
	if signed_RNG_step > 0x4000000 then
		signed_RNG_step = signed_RNG_step - 0x80000000
	end
	gui.pixelText(242,24,"STEP: "..signed_RNG_step)
	predict()
	if client.ispaused() then
		gui.DrawFinish()
		emu.yield()
	else
		emu.frameadvance()
	end
end