Lua Engine (Lutro)¶

Background¶

Lutro is an experimental lua game framework that follows the LÖVE API. Lutro games can be played with LibRetro/RetroArch through the Lutro core.

How to start the Lutro core:¶

• As an example showcasing loading content with the Lutro core, we will load the Pong game hosted on RetroArch's Content Downloader.

You can do this by going to RetroArch's main menu screen and selecting 'Online Updater'. From there, select 'Content Downloader'.

• Select 'Lutro', then select 'Pong.lutro'. This should download and extract this file to RetroArch's Downloads directory.

• Go back to RetroArch's main menu screen. Select 'Load Content', then 'Downloads'.

• Select 'Pong.lutro'.

• If you are asked which core to select, choose 'Lua Engine (Lutro)'.

The content should now start running!

Author/License¶

The Lutro core has been authored by

• Higor Euripedes
• Jean-Andre Santoni

The Lutro core is licensed under

• MIT

A summary of the licenses behind RetroArch and its cores have found here.

Extensions¶

Content that can be loaded by the Lutro core have the following file extensions:

• .lutro
• .lua

Databases¶

RetroArch database(s) that are associated with the Lutro core:

• Lutro

Features¶

Frontend-level settings or features that the Lutro core respects.

Feature	Supported
Restart	✕
Screenshots	✕
Saves	✕
States	✕
Rewind	✕
Netplay	✕
Core Options	✕
RetroAchievements	✕
RetroArch Cheats	✕
Native Cheats	✕
Controls	✔
Remapping	✔
Multi-Mouse	✕
Rumble	✕
Sensors	✕
Camera	✕
Location	✕
Subsystem	✕
Softpatching	✕
Disk Control	✕
Username	✕
Language	✕
Crop Overscan	✕
LEDs	✕

Directories¶

The Lutro core's internal core name is 'lutro'

Geometry and timing¶

• The Lutro core's core provided FPS is 60
• The Lutro core's core provided sample rate is 44100 Hz
• The LUtro core's core provided aspect ratio is (Ratio)

Controllers¶

The Lutro core supports the following device type(s) in the controls menu, bolded device types are the default for the specified user(s):

User 1 device types¶

• None - Doesn't disable input. There's no reason to switch to this.
• RetroPad - Joypad - Stay on this.
• RetroPad w/Analog - Joypad - Same as RetroPad. There's no reason to switch to this.

Controller tables¶

Joypad¶

User 1 Remap descriptors	RetroPad Inputs	Lutro core inputs
		B
		Y
		Select
		Start
Up		Up
Down		Down
Left		Left
Right		Right
		A
		X
		L1
		R1
		L2
		R2
		L3
		R3

External Links¶

• Lua Website
• LÖVE API Website
• Libretro Lutro Core info file
• Libretro Lutro Github Repository
• LUTRO LÖVE API Comparison
• Lutro Github Wiki
• Report Libretro Lutro Core Issues Here

See also¶

Custom Engine¶

• ChaiLove