OpenTTD port to Java

Last update: Dec 16, 2022

Overview

NextTTD (JDrive)

This is an OpenTTD port to Java.

Current state: The game is basically playable - aircrafts, trains, ships and road vehicles are working. But Save/load is not completely tested.

You're welcome to take part in testing and/or development!

Screenshots:

What for

OpenTTD is beautiful. But it still carries on most of the original TTD architectural solutions. Bit banging, obscure data structures and crazy assembler style encoding of tile state.

It's time to move on.

My goals:

Reduce code complexity and obscurity. Core functions code must be twice shorter in terms of byte count.
No more bit fields and C/asm style polymorphism. Make code more OO and, where possible, functional.
Make game save automatic. No manual enumeration of fields to save.

As a result game code must be really easy to understand and modify.

Example:

Obscure and long:

FOR_ALL_INDUSTRIES(ind) {
	if (ind->xy != 0 && (cargo_type == ind->accepts_cargo[0] || cargo_type
			 == ind->accepts_cargo[1] || cargo_type == ind->accepts_cargo[2]) &&
			 ind->produced_cargo[0] != CT_INVALID &&
			 ind->produced_cargo[0] != cargo_type &&
			 (t = DistanceManhattan(ind->xy, xy)) < 2 * u) 
	{
		...
	}
}

Easy to understand and short:

Industry.forEach( ind ->
{			
	if (ind.isValid() && ind.acceptsCargo(cargo_type) 
			&& !ind.producesCargo(cargo_type)
			&& (t = Map.DistanceManhattan(ind.xy, xy)) < 2 * u[0]) 
	{
		...
	}
});

One more example. Code:

static bool AnyTownExists(void)
{
	const Town* t;

	FOR_ALL_TOWNS(t) {
		if (t->xy != 0) return true;
	}
	return false;
}

Becomes:

public static boolean anyTownExist()
{
	return stream().anyMatch( t -> t.isValid() );
}

Why Java

Portability for free. It just runs everywhere. Really.
Cleaner code. (Not yet, but I'm on my way:)
It is easier to build complex data structures in a language with GC.
Mature graphics, sound and midi subsystems

Comments

Rails on slopes are displayed weird

Behavior of train on such slope tile is unpredictable. On the last image the rail is straight and train goes ahead regardless of displayed rail shape.
bug

opened by alexey-lukyanenko 14
This repository violates OpenTTD's license; please fix ASAP

Sorry to also bother you here too, but I cannot stress enough how important this is.

Initially we mentioned this in https://www.tt-forums.net/viewtopic.php?p=1248233#p1248233 and via Discord, but I should have done this in your repository from the start. My apologies for not realizing this earlier.

OpenTTD is licensed under GPLv2, and by that contract, any derivative work has to be licensed under (a compatible) GPLv2 license too. Your code is (obviously) a derivative. But, your code is currently licensed under MIT, and as such, is in violation of OpenTTD's license. See https://www.gnu.org/licenses/gpl-faq.html#AllCompatibility for more details on what is possible. Be mindful of the footnotes.

Please address this issue ASAP. As you currently only have one other contributor, it is still easy to ask @alexey-lukyanenko if they mind you relicensing from MIT to GPLv2. If you would get more contributors, this becomes harder and harder.

Please act now. Don't delay this. I can understand this is not your primary concern, as you just want to code and have fun; and licensing is rarely classified as fun. But the sooner you get this over with, the sooner we can all enjoy working for OpenTTD and their ports!

Thank you.

opened by TrueBrain 1
Network support

http://underpop.online.fr/j/java/help/datagramchannel-network-dev-java-programming-language.html.gz https://www.developer.com/java/data/what-is-non-blocking-socket-programming-in-java/

opened by dzavalishin 1
DrawStringMultiCenter crashes in News

NewsItem.java:74, crash in Strings.java:15, parameter is null Text is '.Service subsidy awarded...'

text ':{BLACK}{BIGFONT}Service subsidy awarded to {COMPANY}!{}{}{STRING} service from {STATION} to {STATION} will pay triple rates for the next year!'

Supposed to eat 5 args (2 for COMPANY), but there are just 4 of them sent.
bug

opened by dzavalishin 1

Multithreading - locks!

menuItemTranspBuildings.addActionListener( e -> 
{ 
	Global._display_opt ^= Global.DO_TRANS_BUILDINGS;
	Hal.MarkWholeScreenDirty();
});

MarkWholeScreenDirty(); needs to be synchronized, for it's called from awt thread

enhancement

opened by dzavalishin 0

OpenTTD port to Java

Related tags

Overview

NextTTD (JDrive)

What for

Why Java

Comments

Rails on slopes are displayed weird

This repository violates OpenTTD's license; please fix ASAP

Network support

DrawStringMultiCenter crashes in News

Multithreading - locks!

Owner

Dmitry Zavalishin

Java port of Brainxyz's Artificial Life, a simple program to simulate primitive Artificial Life using simple rules of attraction or repulsion among atom-like particles, producing complex self-organzing life-like patterns.

Minecraft Multi-Threading Mod Fabric Port

OptiFine 1.7.3 HD MT G2 (+ Long Distance Patch) port to Fabric.

Port of the forge api to fabric, under the same path.

Golden Axe (1989) game implemented in java using only standard libraries (Java 2D, Swing, AWT & Java Sound API)

It is a simple java terminal game. I built it in order to practice my code skills that I obtained while I was learning Java.

A Java Game Engine created in Java with LWJGL!

Desktop/Android/HTML5/iOS Java game development framework

A complete 3D game development suite written purely in Java.

LWJGL is a Java library that enables cross-platform access to popular native APIs useful in the development of graphics (OpenGL, Vulkan), audio (OpenAL), parallel computing (OpenCL, CUDA) and XR (OpenVR, LibOVR) applications.

Java / JavaFX / Kotlin Game Library (Engine)

Jetserver is a high speed nio socket based multiplayer java game server written using Netty and Mike Rettig's Jetlang.It is specifically tuned for network based multiplayer games and supports TCP and UDP network protocols.

[LEGACY] LWJGL 2.X - The Lightweight Java Game Library.

A Java game development framework that deploys to JVM, HTML5, Android and iOS.

A fast, customizable and compatible open source server for Minecraft: Java Edition

A Java user-interface library with support for Minecraft.

Java mod library