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Xevious (NES) Mesen Lua script that shows bombable objects
-- xevious NES Mesen "show bombable objects" Lua script
-- coded by karmic, july 10 2021
-- slightly improved jan 21 2022
function read(addr)
return emu.read(addr, emu.memType.cpuDebug)
end
function readbeword(addr)
lo = read(addr+1)
hi = read(addr)
comb = lo | (hi << 8)
if hi >= 0x80 then
return 0 - ((comb ~ 0xffff) + 1)
else
return comb
end
end
function drawrect(x, y, width, height, color)
emu.drawRectangle(x, y, width, height, color, false, 0)
end
function main()
emu.clearScreen()
-- game must be in main game mode
if read(0x10) ~= 2 then return end
-- magenta, moving enemies
for obj = 0,7 do
if read(0x500 + (obj*0x10)) ~= 0 then
x = read(0x504 + (obj*0x10))
y = readbeword(0x506 + (obj*0x10)) + 1
drawrect(x, y, 0x10, 0x10, 0xff00ff)
end
end
-- cyan, stationary and hidden targets
for obj = 0,0x0f do
if read(0x300 + (obj*0x8)) ~= 0 then
x = read(0x303 + (obj*0x8))
y = readbeword(0x301 + (obj*0x8)) + 1
drawrect(x, y, 0x10, 0x10, 0x00ffff)
end
end
end
emu.addEventCallback(main, emu.eventType.startFrame)
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