[SOLVED] Mana game mechanic in 1.14.4 help

[cinsiian]

Hello everyone,

how can i implement a mana mechanic in the game?

I understood that I need capabilities to make the mana mechanic itself, I tried but seems that the current capabilities documentation is outdated, some voids, classes dont event exist in my directory.

I also need to make a "HUD" like the hearts with a custom texture. I managed to learn that I can do that in the event RenderGameOverlayEvent. I tried but i cannot understand how to print the texture in the overlay.

I've seen many tutorials but unfortunately, they are all outdated.

Thanks for reading.

- cinsiian

Edited September 18, 2019 by cinsiian

[Draco18s]

27 minutes ago, cinsiian said:

but seems that the current capabilities documentation is outdated

They haven't changed. As in, they don't need to change. The documentation remains accurate despite Minecraft having updated because Capabilities are a Forge feature and simply moved forward. There might be some tiny differences here and there where a function name gets changed, but its all stuff easily resolvable just by looking at the classes involved.

29 minutes ago, cinsiian said:

I managed to learn that I can do that in the event RenderGameOverlayEvent. I tried but i cannot understand how to print the texture in the overlay.

The event hook hasn't really changed, you just need to find the new method name for rendering a texture on screen. You can figure this out by looking at other classes that render textures on screen.

[cinsiian]

My problem right now is the capability, I've wrote the majoriti of the classes/interfaces needed. I dont know if they will work, hopefully. 

Right now I have some issues related to the capability factory.

Are there any references/examples of capabilities? 

Thank you.

[Draco18s]

I've got one from 1.12:

https://github.com/Draco18s/ReasonableRealism/tree/1.12.1/src/main/java/com/draco18s/farming/entities/capabilities

I haven't migrated that code to 1.14 yet, but it should be 99% functional.

[cinsiian]

Thank you so much, I will give it a look .

[cinsiian]

I do get an error when I try to get the Capability of the mana:

[11set2019 21:20:03.439] [Server thread/ERROR] [net.minecraftforge.eventbus.EventBus/EVENTBUS]: Exception caught during firing event: cinsiian.urtima.common.capability.mana.PlayerMana cannot be cast to net.minecraftforge.common.util.LazyOptional
	Index: 2
	Listeners:
		0: NORMAL
		1: net.minecraftforge.eventbus.EventBus$$Lambda$2050/614462502@67307e64
		2: ASM: cinsiian.urtima.common.CommonHandler@4023efd4 onPlayerLogsIn(Lnet/minecraftforge/event/entity/player/PlayerEvent$PlayerLoggedInEvent;)V
java.lang.ClassCastException: cinsiian.urtima.common.capability.mana.PlayerMana cannot be cast to net.minecraftforge.common.util.LazyOptional
	at cinsiian.urtima.common.capability.mana.ManaProvider.getCapability(ManaProvider.java:20)
	at net.minecraftforge.common.capabilities.CapabilityDispatcher.getCapability(CapabilityDispatcher.java:102)
	at net.minecraftforge.common.capabilities.CapabilityProvider.getCapability(CapabilityProvider.java:118)
	at net.minecraft.entity.LivingEntity.getCapability(LivingEntity.java:3110)
	at net.minecraft.entity.player.PlayerEntity.getCapability(PlayerEntity.java:2277)
	at cinsiian.urtima.common.CommonHandler.onPlayerLogsIn(CommonHandler.java:89)
	at net.minecraftforge.eventbus.ASMEventHandler_7_CommonHandler_onPlayerLogsIn_PlayerLoggedInEvent.invoke(.dynamic)
	at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80)
	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258)
	at net.minecraftforge.fml.hooks.BasicEventHooks.firePlayerLoggedIn(BasicEventHooks.java:43)
	at net.minecraft.server.management.PlayerList.initializeConnectionToPlayer(PlayerList.java:203)
	at net.minecraft.network.login.ServerLoginNetHandler.tryAcceptPlayer(ServerLoginNetHandler.java:119)
	at net.minecraft.network.login.ServerLoginNetHandler.tick(ServerLoginNetHandler.java:63)
	at net.minecraft.network.NetworkManager.tick(NetworkManager.java:241)
	at net.minecraft.network.NetworkSystem.tick(NetworkSystem.java:148)
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:882)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:800)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:118)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:646)
	at java.lang.Thread.run(Unknown Source)

IMana mana = (IMana) player.getCapability(ManaProvider.MANA, null);

 

[eatthenight]

10 minutes ago, cinsiian said:

I do get an error when I try to get the Capability of the mana:

[11set2019 21:20:03.439] [Server thread/ERROR] [net.minecraftforge.eventbus.EventBus/EVENTBUS]: Exception caught during firing event: cinsiian.urtima.common.capability.mana.PlayerMana cannot be cast to net.minecraftforge.common.util.LazyOptional
	Index: 2
	Listeners:
		0: NORMAL
		1: net.minecraftforge.eventbus.EventBus$$Lambda$2050/614462502@67307e64
		2: ASM: cinsiian.urtima.common.CommonHandler@4023efd4 onPlayerLogsIn(Lnet/minecraftforge/event/entity/player/PlayerEvent$PlayerLoggedInEvent;)V
java.lang.ClassCastException: cinsiian.urtima.common.capability.mana.PlayerMana cannot be cast to net.minecraftforge.common.util.LazyOptional
	at cinsiian.urtima.common.capability.mana.ManaProvider.getCapability(ManaProvider.java:20)
	at net.minecraftforge.common.capabilities.CapabilityDispatcher.getCapability(CapabilityDispatcher.java:102)
	at net.minecraftforge.common.capabilities.CapabilityProvider.getCapability(CapabilityProvider.java:118)
	at net.minecraft.entity.LivingEntity.getCapability(LivingEntity.java:3110)
	at net.minecraft.entity.player.PlayerEntity.getCapability(PlayerEntity.java:2277)
	at cinsiian.urtima.common.CommonHandler.onPlayerLogsIn(CommonHandler.java:89)
	at net.minecraftforge.eventbus.ASMEventHandler_7_CommonHandler_onPlayerLogsIn_PlayerLoggedInEvent.invoke(.dynamic)
	at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80)
	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258)
	at net.minecraftforge.fml.hooks.BasicEventHooks.firePlayerLoggedIn(BasicEventHooks.java:43)
	at net.minecraft.server.management.PlayerList.initializeConnectionToPlayer(PlayerList.java:203)
	at net.minecraft.network.login.ServerLoginNetHandler.tryAcceptPlayer(ServerLoginNetHandler.java:119)
	at net.minecraft.network.login.ServerLoginNetHandler.tick(ServerLoginNetHandler.java:63)
	at net.minecraft.network.NetworkManager.tick(NetworkManager.java:241)
	at net.minecraft.network.NetworkSystem.tick(NetworkSystem.java:148)
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:882)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:800)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:118)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:646)
	at java.lang.Thread.run(Unknown Source)

IMana mana = (IMana) player.getCapability(ManaProvider.MANA, null);

 

show more of your code and dont cast to IMana

[cinsiian]

15 minutes ago, diesieben07 said:

Look at LazyOptional and use it properly.

Should I use LazyOptional.cast(); ?

 

14 minutes ago, eatthenight said:

dont cast to IMana

I need it.

[Draco18s]

1 minute ago, cinsiian said:

Should I use LazyOptional.cast(); ?

No. Does it return an IMana object?

Edited September 11, 2019 by Draco18s

[Animefan8888]

2 minutes ago, cinsiian said:

Should I use LazyOptional.cast(); ?

You might not understand how a LazyOptional works take a look at this thread.

[cinsiian]

IMana mana = player.getCapability(ManaProvider.MANA, null).orElse(null);

Can that work?

[cinsiian]

Ok, I did it but now I get another crash:

[11set2019 23:15:16.716] [modloading-worker-2/ERROR] [net.minecraftforge.fml.javafmlmod.FMLModContainer/]: Exception caught during firing event: null
	Index: 1
	Listeners:
		0: NORMAL
		1: net.minecraftforge.eventbus.EventBus$$Lambda$2061/559879182@34f88844
java.lang.ExceptionInInitializerError
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Unknown Source)
	at net.minecraftforge.common.capabilities.CapabilityManager.lambda$attachCapabilityToMethod$5(CapabilityManager.java:145)
	at net.minecraftforge.common.capabilities.CapabilityManager.lambda$register$0(CapabilityManager.java:79)
	at java.util.ArrayList.forEach(Unknown Source)
	at net.minecraftforge.common.capabilities.CapabilityManager.register(CapabilityManager.java:79)
	at cinsiian.urtima.Urtima.setup(Urtima.java:44)
	at net.minecraftforge.eventbus.EventBus.doCastFilter(EventBus.java:212)
	at net.minecraftforge.eventbus.EventBus.lambda$addListener$11(EventBus.java:204)
	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258)
	at net.minecraftforge.fml.javafmlmod.FMLModContainer.fireEvent(FMLModContainer.java:106)
	at java.util.function.Consumer.lambda$andThen$0(Unknown Source)
	at java.util.function.Consumer.lambda$andThen$0(Unknown Source)
	at net.minecraftforge.fml.ModContainer.transitionState(ModContainer.java:112)
	at net.minecraftforge.fml.ModList.lambda$null$10(ModList.java:133)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(Unknown Source)
	at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source)
	at java.util.stream.AbstractPipeline.copyInto(Unknown Source)
	at java.util.stream.ForEachOps$ForEachTask.compute(Unknown Source)
	at java.util.concurrent.CountedCompleter.exec(Unknown Source)
	at java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
	at java.util.concurrent.ForkJoinTask.doInvoke(Unknown Source)
	at java.util.concurrent.ForkJoinTask.invoke(Unknown Source)
	at java.util.stream.ForEachOps$ForEachOp.evaluateParallel(Unknown Source)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateParallel(Unknown Source)
	at java.util.stream.AbstractPipeline.evaluate(Unknown Source)
	at java.util.stream.ReferencePipeline.forEach(Unknown Source)
	at java.util.stream.ReferencePipeline$Head.forEach(Unknown Source)
	at net.minecraftforge.fml.ModList.lambda$dispatchParallelEvent$11(ModList.java:133)
	at java.util.concurrent.ForkJoinTask$AdaptedRunnableAction.exec(Unknown Source)
	at java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(Unknown Source)
	at java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
	at java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)
Caused by: java.lang.NullPointerException
	at cinsiian.urtima.common.capability.mana.ManaProvider.<clinit>(ManaProvider.java:14)
	... 34 more

Tell me if you need github for this.

ManaProvider.java:14 -- public static IMana INSTANCE = MANA.getDefaultInstance();

Urtima.java:44 -- CapabilityManager.INSTANCE.register(IMana.class, new ManaNBTStorage(), new ManaNBTStorage.Factory());

Edited September 11, 2019 by cinsiian

[cinsiian]

It's the ManaProvider class: https://github.com/cinsiian/mod

[Animefan8888]

2 minutes ago, cinsiian said:

It's the ManaProvider class: https://github.com/cinsiian/mod

Your IMana instance in your provider can't be static if you are gonna use MANA.getDefaultInstance().
 

Quote

return (LazyOptional<T>) INSTANCE;

You can't do this either don't know if I'm looking at outdated code or not.

[cinsiian]

11 minutes ago, Animefan8888 said:

Quote

return (LazyOptional<T>) INSTANCE;

You can't do this either don't know if I'm looking at outdated code or not.

Isn't that the thing I should return?

[Animefan8888]

Just now, cinsiian said:

Isn't that the thing I should return?

LazyOptional is the type that you need to return yes. But is IMana a LazyOptional instance? No therefore you can't cast it into a LazyOptional. You need to have a LazyOptional instance in your ICapabilityProvider.

[cinsiian]

31 minutes ago, Animefan8888 said:

LazyOptional is the type that you need to return yes. But is IMana a LazyOptional instance? No therefore you can't cast it into a LazyOptional. You need to have a LazyOptional instance in your ICapabilityProvider.

What LazyOptional ?? like the default one this.getCompatibility() ?

[Draco18s]

1 hour ago, cinsiian said:

What LazyOptional ?? like the default one this.getCompatibility() ?

LazyOptional is the Type that getCapability() returns. Whatever it is that you want to return, it must be a LazyOptional. Whatever type it is that you get from getCapability, it must be a LazyOptional. In order to handle turning something into a LazyOptional or vice versa, you can't do it with a cast, because that's not what casting does.

[cinsiian]

to return in the getCapability() can i just make a new LazyOptional?

[Draco18s]

58 minutes ago, cinsiian said:

to return in the getCapability() can i just make a new LazyOptional?

You can but you should not. For a variety of reasons.

[cinsiian]

So what I should return then?

[cinsiian]

6 minutes ago, diesieben07 said:

You need to create a LazyOptional

How can I create one?

[cinsiian]

There arent any constructors for it...

Edited September 12, 2019 by cinsiian

[cinsiian]

It calls the IMana not the LazyOptional.

[cinsiian]

@CapabilityInject(IMana.class)
	public static final Capability<IMana> MANA = null;
	public IMana INSTANCE = MANA.getDefaultInstance();
	
	@SuppressWarnings("unchecked")
	public <T> LazyOptional<T> getCapability(Capability<T> cap, Direction side) {
		return (LazyOptional<T>) INSTANCE;
	}

How can I return an actual instance of LazyOptional?