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plugins/cheat: nes, snes, genesis game genie support [Carl]

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This commit is contained in:
cracyc 2017-06-13 14:34:24 -05:00
parent 2484e26b6e
commit 02e77eb610
1 changed files with 169 additions and 19 deletions
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188
plugins/cheat/cheat_simple.lua
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@ -1,3 +1,13 @@
-- converter for simple cheats
-- simple cheats are single address every frame ram or gg,ar cheats in one file called cheat.simple
-- ram cheat format: <set name>,<cputag>,<hex offset>,<b|w|d|q - size>,<hex value>,<desc>
-- gg,ar cheat format: <set name>,<gg|ar - type>,<code>,<desc> like "nes/smb,gg,SXIOPO,Infinite Lives"
-- gg for game genie -- nes, snes, megadriv
-- set name is <softlist>/<entry> like "nes/smb" for softlist items
-- only program address space is supported, comments are prepended with ;
-- size is b - u8, w - u16, d - u32, q - u64
-- Don't use commas in the description
local simple = {}
simple.romset = "????"
@ -7,30 +17,170 @@ function simple.filename(name)
return "cheat.simple"
end
-- converter for simple cheats
-- simple cheats are single address every frame ram cheats in one file called cheat.simple
-- format: <set name>,<cputag>,<hex offset>,<b|w|d|q - size>,<hex value>,<desc>
-- only program address space is supported, comments are prepended with ;
-- size is b - u8, w - u16, d - u32, q - u64
local codefuncs = {}
function codefuncs.nes_gg(desc, code)
local xlate = { A = 0, P = 1, Z = 2, L = 3, G = 4, I = 5, T = 6, Y = 7, E = 8,
O = 9, X = 10, U = 11, K = 12, S = 13, V = 14, N = 15 }
local cheat = { desc = desc, region = { rom = ":nes_slot:cart:prg_rom" } }
local value = 0
code:upper():gsub("(.)", function(s)
if not xlate[s] then
error("error parsing game genie cheat " .. desc)
end
value = (value << 4) | xlate[s]
end)
local addr, newval, comp
cheat.script = { off = "if on then rom:write_u8(addr, save) end" }
if #code == 6 then
addr = ((value >> 4) & 7) | ((value >> 8) & 0x78) | ((value >> 12) & 0x80) | ((value << 8) & 0x700) | ((value << 4) & 0x7800)
newval = ((value >> 20) & 7) | (value & 8) | ((value >> 12) & 0x70) | ((value >> 16) & 0x80)
cheat.script.on = string.format([[
on = true
addr = %d
save = rom:read_u8(addr)
rom:write_u8(addr, %d)]], addr, newval)
elseif #code == 8 then
addr = ((value >> 12) & 7) | ((value >> 16) & 0x78) | ((value >> 20) & 0x80) | (value & 0x700) | ((value >> 4) & 0x7800)
newval = ((value >> 28) & 7) | (value & 8) | ((value >> 20) & 0x70) | ((value >> 24) & 0x80)
comp = ((value >> 4) & 7) | ((value >> 8) & 8) | ((value << 4) & 0x70) | ((value << 1) & 0x80)
-- assume 8K banks, 32K also common but is an easy multiple of 8K
cheat.script.on = string.format([[
addr = %d
save = %d
for i = 0, rom.size, 8192 do
if rom:read_u8(i + addr) == save then
on = true
addr = i + addr
rom:write_u8(addr, %d)
break
end
end]], addr & 0x3fff, comp, newval)
else
error("error game genie cheat incorrect length " .. desc)
end
return cheat
end
function codefuncs.snes_gg(desc, code)
local xlate = { D = 0, F = 1, ["4"] = 2, ["7"] = 3, ["0"] = 4, ["9"] = 5, ["1"] = 6, ["5"] = 7,
["6"] = 8, B = 9, C = 10, ["8"] = 11, A = 12, ["2"] = 13, ["3"] = 14, E = 15 }
local value = 0
local count = 0
local cheat = { desc = desc, region = { rom = ":snsslot:cart:rom" } }
cheat.script = { off = "if on then rom:write_u8(addr, save) end" }
code:upper():gsub("(.)", function(s)
if s == "-" then
return
elseif not xlate[s] then
error("error parsing game genie cheat " .. desc)
end
count = count + 1
value = (value << 4) | xlate[s]
end)
if count ~= 8 then
error("error game genie cheat incorrect length " .. desc)
end
local newval = (value >> 24) & 0xff
local addr = ((value >> 6) & 0xf) | ((value >> 12) & 0xf0) | ((value >> 6) & 0x300) | ((value << 10) & 0xc00) |
((value >> 8) & 0xf000) | ((value << 14) & 0xf0000) | ((value << 10) & 0xf00000)
if (manager:machine().devices[":maincpu"].spaces["program"]:read_u8(0xffd5) & 1) == 1 then --hirom
local bank = addr >> 16
local offset = addr & 0xffff
if (bank & 0x7f) <= 0x3f and offset >= 0x8000 then
-- direct map
elseif (bank & 0x7f) >= 0x40 and (bank & 0x7f) <= 0x7d then
addr = addr & 0x3fffff
elseif bank >= 0xfe then
addr = addr & 0x3fffff
else
error("error game genie cheat not rom addr " .. desc)
end
else --lorom
local bank = addr >> 16
local offset = addr & 0xffff
if (bank & 0x7f) <= 0x3f and offset >= 0x8000 then
addr = ((addr >> 1) & 0x78000) | (addr & 0x7fff)
elseif (bank & 0x7f) >= 0x40 and (bank & 0x7f) <= 0x6f then
addr = ((addr >> 1) & 0x78000) | (addr & 0x7fff)
elseif (bank & 0x7f) >= 0x70 and (bank & 0x7f) <= 0x7d and offset >= 0x8000 then
addr = ((addr >> 1) & 0x78000) | (addr & 0x7fff)
elseif bank >= 0xfe and offset >= 0x8000 then
addr = ((addr >> 1) & 0x78000) | (addr & 0x7fff)
else
error("error game genie cheat not rom addr " .. desc)
end
end
cheat.script.on = string.format([[
addr = %d
save = rom:read_u8(addr)
on = true
rom:write_u8(addr, %d)
]], addr, newval)
return cheat
end
function codefuncs.megadriv_gg(desc, code)
local xlate = { A = 0, B = 1, C = 2, D = 3, E = 4, F = 5, G = 6, H = 7, J = 8, K = 9, L = 10, M = 11, N = 12,
P = 13, R = 14, S = 15, T = 16, V = 17, W = 18, X = 19, Y = 20, Z = 21, ["0"] = 22, ["1"] = 23,
["2"] = 24, ["3"] = 25, ["4"] = 26, ["5"] = 27, ["6"] = 28, ["7"] = 29, ["8"] = 30, ["9"] = 31 }
local value = 0
local count = 0
local cheat = { desc = desc, region = { rom = ":mdslot:cart:rom" } }
cheat.script = { off = "if on then rom:write_u16(addr, save) end" }
code:upper():gsub("(.)", function(s)
if s == "-" then
return
elseif not xlate[s] then
error("error parsing game genie cheat " .. desc)
end
count = count + 1
value = (value << 5) | xlate[s]
end)
local newval = ((value >> 32) & 0xff) | ((value >> 3) & 0x1f00) | ((value << 5) & 0xe000)
local addr = (value & 0xff00ff) | ((value >> 16) & 0xff00)
cheat.script.on = string.format([[
addr = %d
save = rom:read_u16(addr)
on = true
rom:write_u16(addr, %d)
]], addr, newval)
return cheat
end
function simple.conv_cheat(data)
local cheats = {}
for line in data:gmatch('([^\n;]+)') do
local set, cputag, offset, size, val, name = line:match('([^,]+),([^,]+),([^,]+),([^,]+),([^,]+),(.+)')
local set, cputag, offset, size, val, desc = line:match('([^,]+),([^,]+),([^,]+),?([^,]*),?([^,]*),(.*)')
if set == simple.romset then
local cheat = {}
cheat.desc = name
cheat.space = { cpup = { tag = cputag, type = "program" } }
if size == "w" then
size "u16"
elseif size == "d" then
size = "u32"
elseif size == "q" then
size = "u64"
else
size = "u8"
local cheat
if cputag.sub(1,1) ~= ":" then
local list, name = set:match('([^/]+)/(.+)')
local func = list .. "_" .. cputag
if list and desc and codefuncs[func] then
local status
status, cheat = pcall(codefuncs[func], desc, offset)
if not status then
emu.print_error(cheat)
cheat = nil
end
end
elseif size and val then
cheat = { desc = desc, space = { cpup = { tag = cputag, type = "program" } } }
if size == "w" then
size "u16"
elseif size == "d" then
size = "u32"
elseif size == "q" then
size = "u64"
else
size = "u8"
end
cheat.script = { run = "cpup:write_" .. size .. "(0x" .. offset .. ",0x" .. val .. ", true)" }
end
if cheat then
cheats[#cheats + 1] = cheat
end
cheat.script = { run = "cpup:write_" .. size .. "(0x" .. offset .. ",0x" .. val .. ", true)" }
cheats[#cheats + 1] = cheat
end
end
return cheats