Topic by Pokota

Posted: 12/23/2014 3:29 PM
(Edited: 1/7/2016 4:02 AM)

Post subject: Adventures in Lua (BizHawk, DeSmuME, and others)

Quote

Pokota

He/Him

Joined: 2/5/2014
Posts: 779

E: Originally, this thread was BizHawk centric, but has since branched out to other emulators. NOTE: This thread isn't just for me to get help, but for everyone to show off and ask help for their ~~BizHawk~~ Lua scripts. ---- So because BizHawk has its own ~~interpretation~~ implementation of Lua, I figured I could write some Lua Scripts to use when I'm playing around. Then I realized that I've never actually scripted in Lua before. After a few quick lessons and some bugsquashing by the good people in IRC, I've managed to put together my first ever Lua HUD script. Download smb2hud.lua

Language: lua
-- "Super Mario Bros. 2"
local cherryCount
local foeLifeA
local foeLifeB
local squatTimer
UI_GREEN = 0x00FF00;
UI_RED = 0xFF0000;
while (true) do
	
	cherryCount = memory.readbyte(0x062A);
	squatTimer = memory.readbyte(0x04CA);
	
	foeLifeA = memory.readbyte(0x0468);
	if (foeLifeA == 255) then 
		foeLifeA = -1; 
	end
	
	foeLifeB = memory.readbyte(0x0469);
	if (foeLifeB == 255) then
		foeLifeB = -1; 
	end	
	
	foeLifeA = foeLifeA + 1;
	foeLifeB = foeLifeB + 1;
		
	gui.drawRectangle(40,20,(foeLifeA*5),5);
	gui.drawRectangle(40,25,(foeLifeB*5),5);
	
	gui.drawRectangle(40,10,60,5); 
	gui.drawRectangle(40,10,squatTimer,5); 
	
	for i = 0, cherryCount, 1 do
		gui.drawIcon("cherry.ico",0,(i*16)-8,16,16);
	end
	
	emu.frameadvance();
end

Which yields this amended HUD:

What I'm planning on doing next is ~~fixing the Cherry Meter to show how many cherries have been collected instead of simply moving the cherry around~~, then converting the enemy health meters from bars to hearts, then coloring the squat meter.

Adventures in Lua When did I get a vest?

Posted: 12/24/2014 10:15 PM
(Edited: 12/25/2014 3:26 PM)

Quote

Pokota

He/Him

Joined: 2/5/2014
Posts: 779

So now this is a thing.

Download z2hud.lua

Language: lua
-- "Zelda II: The Adventure of Link"

local bagCounter
local currentMP
local currentHP
local maxMP
local maxHP
local hearts
local jars
local armor
local intel
local skill
local xp
local toLevelTemp
local toLevel
local percentToLevel
local keys
local selector

while true do

	bagCounter = memory.readbyte(0x05DF);
	currentMP = memory.readbyte(0x0773);
	currentHP = memory.readbyte(0x0774);
	hearts = memory.readbyte(0x0784);
	jars = memory.readbyte(0x0783);
	armor = memory.readbyte(0x0779);
	intel = memory.readbyte(0x0778);
	skill = memory.readbyte(0x0777);
	xp = (memory.readbyte(0x0775)*255)+memory.readbyte(0x0776);
	toLevelTemp = (memory.readbyte(0x0770)*255)+memory.readbyte(0x0771);
	keys = memory.readbyte(0x0793);
	selector = memory.readbyte(0x0749);
	
	percentToLevel = xp / toLevelTemp;
	toLevel = percentToLevel*100;
		
	maxMP = (jars*32)-1;
	maxHP = (hearts*32)-1;
	
	gui.drawBox(0,0,255,41,"White","Black");
	
	gui.drawText(0,8,armor.."|HP: "..currentHP.."/"..maxHP,"Red",11);
	gui.drawText(0,18,intel.."|MP: "..currentMP.."/"..maxMP,"White",11);
	gui.drawText(0,28,skill.."|"..bagCounter.." enemies since last drop","Yellow",11);
	
	gui.drawText(95,8," Keys: "..keys,"Aqua",11);
	gui.drawText(95,18,"Spell: "..selector,"White",11);
	
	gui.drawRectangle(235,8,20,(32*percentToLevel),"Green","Green");
	
	gui.drawBox(235,8,255,40,"White");
	
	emu.frameadvance();
end

I need to flip the direction of the experience bar, but other than that this is about where I like it. And now that I know how to handle color ~~(passing a name string instead of any sort of number? Sure, let's go with that)~~, I can make forward progress on the SMB2 one. A little bit of reinventing the wheel here, but it's FUN ^^ EDIT: Thanks to Scepheo, I now know that colors are passed in through four bytes instead of three. 0xFF00FF00 is Green - this declares 255 Alpha, 0 Red, 255 Green, and 0 Blue. Now to use this as intended...

Adventures in Lua When did I get a vest?

Posted: 12/25/2014 2:56 PM

Quote

feos

Site Admin, Skilled player (1254)

Joined: 4/17/2010
Posts: 11475
Location: Lake Chargoggagoggmanchauggagoggchaubunagungamaugg

You can highlight syntax, and even download code as a file: Download sample.lua

Language: lua
function stuff()
    x = memory.reawword(0x100)
    gui.text(10,10,string.format("Xpos: %d",x))
end

gui.register(stuff) -- obsoletes the "while true do emu.frameadvance() end" loop

[code=sample.lua] function stuff() x = memory.reawword(0x100) gui.text(10,10,string.format("%d",x)) end gui.register(stuff) -- obsoletes the "while true do emu.frameadvance() end" loop [/code] However when using scripts with < and >, make sure to "Disable HTML in this post". I'm also pretty sure using "local" for globally declared variables is unnecessary. As is declaring them without instantly using, as is ";".

Warning: When making decisions, I try to collect as much data as possible before actually deciding. I try to abstract away and see the principles behind real world events and people's opinions. I try to generalize them and turn into something clear and reusable. I hate depending on unpredictable and having to make lottery guesses. Any problem can be solved by systems thinking and acting.

Posted: 12/25/2014 3:20 PM

Quote

zeromus

Editor, Emulator Coder

Joined: 8/7/2008
Posts: 1156

It's good practice to type local everywhere in lua, in fact there's strict.lua to enforce it. Even at the global level it still makes sense, because it isn't actually global but instead 'script-level' and a local declared there wouldn't be accessible to other scripts, and would run faster than a true global. That's what I remember, anyway.

Posted: 12/25/2014 3:25 PM

Quote

Pokota

He/Him

Joined: 2/5/2014
Posts: 779

feos wrote:

I'm also pretty sure using "local" for globally declared variables is unnecessary. As is declaring them without instantly using, as is ";".

C# habits are hard to break. With that said, I'll update the scripts to account for gui.register today, and I'll modify the posts above for syntax highlighting. Link to video Link to video

Adventures in Lua When did I get a vest?

Posted: 12/25/2014 4:13 PM

Quote

feos

Site Admin, Skilled player (1254)

Joined: 4/17/2010
Posts: 11475
Location: Lake Chargoggagoggmanchauggagoggchaubunagungamaugg

Brackets around conditions (unless they're complicated) also aren't required.

Warning: When making decisions, I try to collect as much data as possible before actually deciding. I try to abstract away and see the principles behind real world events and people's opinions. I try to generalize them and turn into something clear and reusable. I hate depending on unpredictable and having to make lottery guesses. Any problem can be solved by systems thinking and acting.

Posted: 12/25/2014 4:20 PM

Quote

Pokota

He/Him

Joined: 2/5/2014
Posts: 779

It broke once and putting the condition in brackets fixed it, so I'm going with what I know. Besides, I'm using Notepad++ as my editor, which lets me spot missing brackets quickly. Most of what I end up screwing up is stray characters like out of place commas and punkts. EDIT: The sample you posted yields this error:

LuaInterface.LuaScriptException: E:\Games\Emulation\Lua\sample.lua:7: attempt to call field 'register' (a nil value)

Adventures in Lua When did I get a vest?

Posted: 12/25/2014 6:15 PM

Quote

Amaraticando

It/Its

Editor, Player (159)

Joined: 1/10/2012
Posts: 673
Location: Brazil

Pokota wrote:

EDIT: The sample you posted yields this error:

LuaInterface.LuaScriptException: E:\Games\Emulation\Lua\sample.lua:7: attempt to call field 'register' (a nil value)

This error signals that there's no field register in the table gui. This is a function in Snes9x API. Instead of gui.register, try event.onframeend(stuff). More events are listed here http://tasvideos.org/Bizhawk/LuaFunctions.html

Posted: 12/25/2014 7:01 PM

Quote

Pokota

He/Him

Joined: 2/5/2014
Posts: 779

Taking that information, I was able to clean up the Zelda II script quite quickly. When I try to apply the same idea to the SMB2 script, it breaks citing unable to find cherry.png - which is in the same folder that I'm running the script out of. (Code block below actually does work, it's when I convert from this to on frame end that it breaks) Download smb2hudv2.lua

Language: lua
-- "Super Mario Bros. 2"
local cherryCount
local foeLifeA
local foeLifeB
local foeLifeC
local foeLifeD
local foeLifeE
local squatTimer
local carpetTimer
local starTimer
local dreamTimer
local bigVegCount
local stopTimer
local starPercent
local carpetPercent
local dreamPercent
local stopPercent

TIMER = 100;

while (true) do
	
	cherryCount = memory.readbyte(0x062A);
	bigVegCount = memory.readbyte(0x062C);
	squatTimer = memory.readbyte(0x04CA);
	
	carpetTimer = memory.readbyte(0x00B9);
	dreamTimer = memory.readbyte(0x04B7);
	starTimer = memory.readbyte(0x04E0);
	stopTimer = memory.readbyte(0x04FF);
	
	carpetPercent = carpetTimer / 160;
	dreamPercent = dreamTimer / 96;
	starPercent = starTimer / 62;
	stopPercent = stopTimer / 255;
	
	foeLifeA = memory.read_s8(0x0465);
	foeLifeB = memory.read_s8(0x0466);
	foeLifeC = memory.read_s8(0x0467);
	foeLifeD = memory.read_s8(0x0468);
	foeLifeE = memory.read_s8(0x0469);
				 
	gui.drawRectangle(100,8,squatTimer,4,"Cyan","Cyan");
	gui.drawRectangle(100,8,60,4,"RED");
	
	gui.drawRectangle(100,15,TIMER*carpetPercent,5,"Red","Red");
	gui.drawRectangle(100,15,TIMER*dreamPercent,5,"CYAN","CYAN");
	gui.drawRectangle(100,15,TIMER*starPercent,5,"MAGENTA","MAGENTA");
	gui.drawRectangle(100,15,TIMER*stopPercent,5,"Yellow","Yellow");
	
	gui.drawRectangle(100,15,TIMER,5,"White");
	
	for i = 0, cherryCount, 1 do
		gui.drawImage("cherry.png",(i*8)-8,16);
	end
	
	for j = 0, bigVegCount, 1 do
		gui.drawImage("veg.png",(j*8)-8,8);
	end
	
	for k = 0, foeLifeA, 1 do
		gui.drawImage("heart.png",(k*8)-8,144);
	end
	
	for l = 0, foeLifeB, 1 do
		gui.drawImage("heart.png",(l*8)-8,160);
	end
	
	for m = 0, foeLifeC, 1 do
		gui.drawImage("heart.png",(m*8)-8,176);
	end
	
	for n = 0, foeLifeD, 1 do
		gui.drawImage("heart.png",(n*8)-8,184);
	end
	
	for o = 0, foeLifeE, 1 do
		gui.drawImage("heart.png",(o*8)-8,192);
	end
	
	emu.frameadvance();
end

Lua HUD Package for SMB2, v2

Adventures in Lua When did I get a vest?

Posted: 12/25/2014 7:20 PM

Quote

Amaraticando

It/Its

Editor, Player (159)

Joined: 1/10/2012
Posts: 673
Location: Brazil

I write a script for lsnes and try to adapt it to run in BizHawk. To facilitate things, I use:

Language: lua
-- Compatibility
local u8  = mainmemory.read_u8
local s8  = mainmemory.read_s8
local u16 = mainmemory.read_u16_le
local s16 = mainmemory.read_s16_le

-- Example
local RNG = u8(WRAM.RNG)

So, in the other emulator, I just do the same thing with the proper functions. Another good side of this is that I don't have to memorize a big name like "mainmemory.read_s16_le".

Posted: 12/26/2014 4:49 AM
(Edited: 1/31/2015 6:05 AM)

Quote

mz

Emulator Coder, Player (79)

Joined: 10/26/2007
Posts: 693

I wrote this unnecessarily long and messy script for Tails Adventure to create maps, view hitboxes, take screenshots, and other stuff: http://pastebin.com/XZfwkwDe I used it mainly just to take a screenshot for each frame and write the X and Y coordinates of the game camera, so I could make some videos: https://www.youtube.com/watch?v=FOmlQk8X0UQ I also liked how the maps looked after Tails had gone all over them:

(Sorry for the long image, I can change it to a link if anyone finds it annoying.)

You're just fucking stupid, everyone hates you, sorry to tell you the truth. no one likes you, you're someone pretentious and TASes only to be on speed game, but don't have any hope, you won't get there.

Posted: 12/26/2014 12:26 PM

Quote

Scepheo

Player (146)

Joined: 7/16/2009
Posts: 686

Pokota: as you probably know from C#, it's always a good idea to look for repeating structures in your script, and convert them to simpler code. For example, all of the "foeLife" related code can be made a lot simpler and cleaner:

Language: lua
for i = 0, 5 do
	local hp = memory.read_s8(0x0465 + i)
	local y = 144 + 16 * i
	
	for j = 0, hp do
		gui.drawImage("heart.png", j * 8 - 8, y)
	end
end

Posted: 12/26/2014 2:41 PM

Quote

feos

Site Admin, Skilled player (1254)

Joined: 4/17/2010
Posts: 11475
Location: Lake Chargoggagoggmanchauggagoggchaubunagungamaugg

There's also a way to display some huge string of numbers, breaking it into lines where it fits the best. Bonus points for displaying slot numbers over object sprites.

Language: lua
-- SolarJetman objects
function DrawTable()
	local Xcam = memory.readwordsigned(0x4c)
	local Ycam = memory.readwordsigned(0x4e)
	for Slot = 0, 0x1f do
		local ID = memory.readbyte(0x317 + Slot)
		local X  = memory.readwordsigned(0x200 + Slot, 0x21f + Slot) - Xcam
		local Y  = memory.readwordsigned(0x25d + Slot, 0x27c + Slot) - Ycam
		local CellWidth   = 32
		local CellHeight  = 8
		local ScreenWidth = 256
		local RowLength   = 8
		local OffsetX     = 1
		local OffsetY     = 9
		local Color       = "white"
		if ID == 0 then Color = "red" end
		gui.text(
			Slot * CellWidth % ScreenWidth + OffsetX,	-- text X
			math.floor(Slot / RowLength) * CellHeight + OffsetY,	-- text Y
			string.format("%2d:%02X", Slot, ID),	-- output string
			Color	-- you guess
		)
		gui.text(X, Y, Slot)
	end
end

Warning: When making decisions, I try to collect as much data as possible before actually deciding. I try to abstract away and see the principles behind real world events and people's opinions. I try to generalize them and turn into something clear and reusable. I hate depending on unpredictable and having to make lottery guesses. Any problem can be solved by systems thinking and acting.

Posted: 1/27/2015 10:55 PM

Quote

ventuz

He/Him

Player (125)

Joined: 10/4/2004
Posts: 940

Is there way to get rom crc32 hash? current lua in BizHawk seem to only return SHA-1 hash.

Posted: 1/27/2015 11:27 PM

Quote

zeromus

Editor, Emulator Coder

Joined: 8/7/2008
Posts: 1156

write which platform you want it for, since the code to do the hashes differs by platform, and consider it a feature request.

Posted: 1/28/2015 11:52 AM

Quote

Pokota

He/Him

Joined: 2/5/2014
Posts: 779

I've been experimenting with a partial hud replacement for the Zelda Oracles games - nothing fancy, just a replaced health meter and an added Maple meter. I've just run into the issue that Seasons stores the bytes I need in a different location from Ages, so either I make two flavors or I actually study case/switch flow control. The reason Gasha Tree progress isn't included? Each tree has its own byte.

Adventures in Lua When did I get a vest?

Posted: 1/29/2015 12:03 AM

Quote

Sappharad

Joined: 3/11/2012
Posts: 149
Location: WI

Pokota wrote:

I've been experimenting with a partial hud replacement for the Zelda Oracles games - nothing fancy, just a replaced health meter and an added Maple meter. I've just run into the issue that Seasons stores the bytes I need in a different location from Ages, so either I make two flavors or I actually study case/switch flow control. The reason Gasha Tree progress isn't included? Each tree has its own byte.

Can't you just check the title at ROM offset 0x134 for that? Oracle of Ages is "ZELDA NAYRU" and Oracle of Seasons is "ZELDA DIN"

Posted: 1/29/2015 12:56 AM

Quote

Pokota

He/Him

Joined: 2/5/2014
Posts: 779

@Sappharad: The actual offsets for the ram values I need to pull for the Maple Meter and health meter are in different places between the two games. Probably because of the difference in titles, now that I think about it. And it's more "I haven't played with the case/switch flow control yet" than anything else.

Adventures in Lua When did I get a vest?

Posted: 1/29/2015 1:03 AM

Quote

Scepheo

Player (146)

Joined: 7/16/2009
Posts: 686

Pseudocode below:

Language: Lua
checkCharacter = read_from_rom(0x140);

if (checkCharacter == "N") then
    offset = someValue;
else
    offset = someOtherValue;
end

ram_value = read_from_ram(offset);

Obviously these aren't the correct function names and you'd have to check against the numeric value for 'D' (ZELDA DIN) vs. 'N' (ZELDA NAYRU), but walking through a switch/case every time instead of just setting the offsets correct at the beginning is a needless performance hit.

Posted: 1/30/2015 1:50 AM

Quote

Sappharad

Joined: 3/11/2012
Posts: 149
Location: WI

Sorry, I read the posts linearly without paying attention to the poster names. So I thought the answer to the "Why do you need crc32?" question was for telling the two oracle games apart, and provided an answer for how to tell the two games apart. After looking up again, I see those were two different conversations. But hopefully my suggestion is at least somewhat useful.

Posted: 2/27/2015 12:24 PM

Post subject: Metroid II - Return of Samus - HUD: Metroid Queen HP

Quote

CrazyTerabyte

He/Him

Joined: 5/7/2005
Posts: 74

This small code shows the HP of the last boss in Metroid II game for GameBoy. This code most likely won't work inside Super GameBoy, though. Having this health bar gives useful feedback to the player. For me (my first playthrough of this game), the last fight was frustrating and near-impossible. After seeing the boss health bar, and seeing it going down, the fight became a lot more fun! It also gave me clear feedback on which attacks work, and how to defeat the boss faster.

Language: lua
while true do

	HP = mainmemory.readbyte(0x03D3);
	MAX = 150;

	if HP > 0 and HP <= MAX then
		-- Color is 0xAARRGGBB.
		gui.drawRectangle(0,144-16, HP,8, 0, 0xFFFF0000);
		gui.drawRectangle(0,144-16, MAX,7, 0xFFFFFFFF, 0);
	end;

	emu.frameadvance();

end

Posted: 2/28/2015 2:12 AM

Quote

Pokota

He/Him

Joined: 2/5/2014
Posts: 779

I'll poke around in ram and see if I can't adapt that to work for all metroids and not just the queen. I know Zetas will be a lot less stressful with visual progress being made.

Adventures in Lua When did I get a vest?

Posted: 3/6/2015 1:02 AM

Quote

CrazyTerabyte

He/Him

Joined: 5/7/2005
Posts: 74

@Pokota: for the first Metroid game (the NES one), there is already a fairly comprehensive RAM map. However, there is none for Metroid II (GB). Maybe you could write down your findings in that wiki? http://datacrystal.romhacking.net/wiki/Metroid:RAM_map http://datacrystal.romhacking.net/wiki/Metroid_II:_Return_of_Samus

Posted: 3/7/2015 10:04 PM

Quote

CrazyTerabyte

He/Him

Joined: 5/7/2005
Posts: 74

For Disney's Aladdin (U) [!] (SEGA Mega Drive/Genesis), I've written the following script. It allows hiding the HUD, and can also move sprites in front of the other layers (now we can see hidden items).

Language: lua
-- Sprite Table for Disney's Aladdin
SPRITE_TABLE = 0xF400
-- Information about sprite table layout: http://md.squee.co/wiki/VDP#Sprites


function get_sprite_pattern(index)
	local data

	memory.usememorydomain("VRAM")
	data = memory.read_u16_be(SPRITE_TABLE + 8*index + 2*2)
	return bit.band(data, 0x7FF)
end


function set_sprite_x(index, pos)
	memory.usememorydomain("VRAM")
	pos = bit.band(pos, 0x1FF)
	memory.write_u16_be(SPRITE_TABLE + 8*index + 3*2, pos)
end


function set_sprite_priority(index, priority)
	local data
	memory.usememorydomain("VRAM")
	data = memory.read_u16_be(SPRITE_TABLE + 8*index + 2*2)
	if priority == 1 then
		data = bit.bor(data, 0x8000)
	elseif priority == 0 then
		data = bit.band(data, 0x7FFF)
	end
	memory.write_u16_be(SPRITE_TABLE + 8*index + 2*2, data)
end


FORM = forms.newform(128, 80, "Aladdin")
CHECK_HUD = forms.checkbox(FORM, "Hide HUD", 0, 0)
CHECK_TOP = forms.checkbox(FORM, "Sprites on-top", 0, 24)


while true do

	for i = 0, 128, 1 do
		local pat = get_sprite_pattern(i)
		if
			(pat >= 0x680 and pat <= 0x6FF)  -- Health, Lives, Apples, Gems
			or (pat >= 0x7C0 and pat <= 0x7E4)  -- Score
		then
			if forms.ischecked(CHECK_HUD) then
				-- 32 is to the left, outside the screen
				set_sprite_x(i, 32)
			end
		else
			if forms.ischecked(CHECK_TOP) then
				-- Set all other sprites above the layers
				set_sprite_priority(i, 1)
			end
		end
	end
	emu.frameadvance()

end

I've also built this RAM Watch map:

Domain 68K RAM
SystemID GEN
7E29	b	h	1	68K RAM	Score - 0x30~0x39
7E2A	b	h	1	68K RAM	Score - 0x30~0x39
7E2B	b	h	1	68K RAM	Score - 0x30~0x39 - thousands
7E2C	b	h	1	68K RAM	Score - 0x30~0x39 - hundreds
7E2D	b	h	1	68K RAM	Score - 0x30~0x39 - tens
7E2E	b	h	1	68K RAM	Score - 0x30~0x39 - units
7E3C	b	h	1	68K RAM	Lives - 0x30~0x39 - units
7E3F	b	h	1	68K RAM	Continues - 0~unlimited
EFE0	b	h	1	68K RAM	Apples - 0x30~0x39 - tens
EFE1	b	h	1	68K RAM	Apples - 0x30~0x39 - units
EFE2	b	h	1	68K RAM	Gems - 0x30~0x39 - tens
EFE3	b	h	1	68K RAM	Gems - 0x30~0x39 - units
EFFA	b	h	1	68K RAM	Health - 00~08
F003	b	h	1	68K RAM	Genies - 00~unlimited
F400	w	h	1	VRAM	Sprite Table

Posted: 3/15/2015 12:25 PM

Quote

Pokota

He/Him

Joined: 2/5/2014
Posts: 779

Okay, question time. Do the readbyte family of commands accept decimal numbers or just hex numbers?

Adventures in Lua When did I get a vest?

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