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I need capabilities to make the mana mechanic itself, I tried but seems that the current capabilities documentation is outdated, some voids, classes dont event exist in my directory.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I've seen many tutorials but unfortunately, they are all outdated.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, 20196 yr by cinsiian

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but seems that the current capabilities documentation is outdated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.

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.

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.

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

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);

 

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

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.

1 minute ago, cinsiian said:

Should I use LazyOptional.cast(); ?

No. Does it return an IMana object?

Edited September 11, 20196 yr by Draco18s

2 minutes ago, cinsiian said:

Should I use LazyOptional.cast(); ?

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

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

Can that work?

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, 20196 yr by cinsiian

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

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.

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?

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.

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() ?

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.

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

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.

So what I should return then?

6 minutes ago, diesieben07 said:

You need to create a LazyOptional

How can I create one?

There arent any constructors for it...

Edited September 12, 20196 yr by cinsiian

It calls the IMana not the LazyOptional.

@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?