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Explain how Forge works to me! please..!

Nisergious

By Nisergious
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Nisergious Tree Puncher

Nisergious

Posted
Posted

I'm a semi competent java developer and I find forge extremely interesting as it allows compatibility between many mods and handles a lot of seemingly difficult problems associated with compatibility between code written by different people for different things. From what I gather it uses hooks? to handle requests to things that are base game? I've looked at the github and specifically the patches and a lot of the function names are not really human readable nor good names haha. are the patches auto generated? how are they made? what are hooks and how do they work? How does forge handle mod loading and potential code overlaps? What is the structure of forge? Where would be a good place for me to start reading in the github to get a basic understanding of how it runs and works?

 

Thanks!

Ernio Reality Controller

Ernio

Posted
Posted

In basic words:

Game is launched, forge injects its changes to vanilla code (using ASM). Those changes add new methods that are called by vanilla source, special case - events that are called when something happens. When event happens all mods that subscribe to it can know of it and act. They can also cancel it and/or change outcome. Note that events also can have priority, so its not like full compatibility is always possible.

 

All those questions are pretty broad, and I am not the person who works with internals to descripe exact processes.

Anyway - when you setup your workspace - all events are in forge's events packages (client+common).

 

As to question about "code overlaps" - it doesn't really work like that. As said - events can be tracked by every mod which can than respond to them, code won't overlap since its totally separate thing. What can overlap is when you are writing CORE Mod. Core mod is a mod that uses ASM (like Forge itself) to modify code at runtime (startup). Because of that Core Modding is extremely incompatible and can lead to errors - thus it is discouraged to do so (unless absolutely needed, in which case you are most certainly writing something VERY specific, which Forge can't handle for you using events).

1.7.10 is no longer supported by forge, you are on your own.

Toost Tree Puncher

Toost

Posted
Posted

I made it so that vanilla torches explode, using events. That was fun.

DRAGONMANG: "I'm Dragonmang, m8. Here me roar."

HERO: "Oh no... not. Dragonmang."

DRAGONMANG: "Roar, m8."

HERO: "Ahhh......"

And so the brave knight and Dragonmang fought on the mountaintop for many moons....

Ernio Reality Controller

Ernio

Posted
Posted

Yeah, the patches are generated using "magic" (no, they are not written by hand, obviously). THey are injected on startup using ASM.

 

Hook = "extra" methods and events. On top of that there is obviously a lot of other things (like model api/loaders, registry, ore dictionary, shit ton of useful things you won't find in vanilla).

And by "extra" I mean - Forge adds quite some methods that are called on the way of vanilla calls which allows modders more access to what is happening (those methods are mainly for mod-made code, e.g: You have better access to how your e.g: ItemWand works or methods that ask you what should be returend is very specific situation of using your Item).

1.7.10 is no longer supported by forge, you are on your own.

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    • vals_kenway
      Problem Sync Client-server for Entity Mount

      By vals_kenway · Posted

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MountableWolfEntity package com.vals.valscraft.entity; import com.vals.valscraft.network.MountSyncPacket; import com.vals.valscraft.network.NetworkHandler; import net.minecraft.client.Minecraft; import net.minecraft.network.syncher.EntityDataAccessor; import net.minecraft.network.syncher.EntityDataSerializers; import net.minecraft.network.syncher.SynchedEntityData; import net.minecraft.server.MinecraftServer; import net.minecraft.server.level.ServerPlayer; import net.minecraft.world.entity.EntityType; import net.minecraft.world.entity.Mob; import net.minecraft.world.entity.ai.attributes.AttributeSupplier; import net.minecraft.world.entity.ai.attributes.Attributes; import net.minecraft.world.entity.animal.Wolf; import net.minecraft.world.entity.player.Player; import net.minecraft.world.entity.Entity; import net.minecraft.world.InteractionHand; import net.minecraft.world.InteractionResult; import net.minecraft.world.item.ItemStack; import net.minecraft.world.item.Items; import net.minecraft.world.level.Level; import net.minecraft.world.phys.Vec3; import net.minecraftforge.event.TickEvent; import net.minecraftforge.eventbus.api.SubscribeEvent; import net.minecraftforge.network.PacketDistributor; public class MountableWolfEntity extends Wolf { private boolean hasSaddle; private static final EntityDataAccessor<Byte> DATA_ID_FLAGS = SynchedEntityData.defineId(MountableWolfEntity.class, EntityDataSerializers.BYTE); public MountableWolfEntity(EntityType<? extends Wolf> type, Level level) { super(type, level); this.hasSaddle = false; } @Override protected void defineSynchedData() { super.defineSynchedData(); this.entityData.define(DATA_ID_FLAGS, (byte)0); } public static AttributeSupplier.Builder createAttributes() { return Wolf.createAttributes() .add(Attributes.MAX_HEALTH, 20.0) .add(Attributes.MOVEMENT_SPEED, 0.3); } @Override public InteractionResult mobInteract(Player player, InteractionHand hand) { ItemStack itemstack = player.getItemInHand(hand); if (itemstack.getItem() == Items.SADDLE && !this.hasSaddle()) { if (!player.isCreative()) { itemstack.shrink(1); 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} this.flyingSpeed = this.getSpeed() * 0.1F; this.setSpeed((float) this.getAttributeValue(Attributes.MOVEMENT_SPEED) * 1.5F); this.setDeltaMovement(new Vec3(strafe, travelVector.y, forward).scale(this.getSpeed())); this.calculateEntityAnimation(this, false); } else { // The wolf does not have a passenger or the passenger is not a player System.out.println("No player is mounted, or the passenger is not a player."); super.travel(travelVector); } } public boolean hasSaddle() { return this.hasSaddle; } public void setSaddle(boolean hasSaddle) { this.hasSaddle = hasSaddle; } @Override protected void dropEquipment() { super.dropEquipment(); if (this.hasSaddle()) { this.spawnAtLocation(Items.SADDLE); this.setSaddle(false); } } @SubscribeEvent public static void onServerTick(TickEvent.ServerTickEvent event) { if (event.phase == TickEvent.Phase.START) { MinecraftServer server = net.minecraftforge.server.ServerLifecycleHooks.getCurrentServer(); if (server != null) { for (ServerPlayer player : server.getPlayerList().getPlayers()) { if (player.isPassenger() && player.getVehicle() instanceof MountableWolfEntity) { MountableWolfEntity wolf = (MountableWolfEntity) player.getVehicle(); 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} } } @Override public void removePassenger(Entity passenger) { super.removePassenger(passenger); if (passenger instanceof Player) { Player player = (Player) passenger; if (!this.level.isClientSide && player instanceof ServerPlayer) { // Send the packet to the server to indicate the player is no longer mounted NetworkHandler.CHANNEL.send(PacketDistributor.PLAYER.with(() -> (ServerPlayer) player), new MountSyncPacket(false)); } } } @Override public boolean isControlledByLocalInstance() { Entity entity = this.getControllingPassenger(); return entity instanceof Player; } @Override public void positionRider(Entity passenger) { if (this.hasPassenger(passenger)) { double xOffset = Math.cos(Math.toRadians(this.getYRot() + 90)) * 0.4; double zOffset = Math.sin(Math.toRadians(this.getYRot() + 90)) * 0.4; passenger.setPos(this.getX() + xOffset, this.getY() + this.getPassengersRidingOffset() + passenger.getMyRidingOffset(), this.getZ() + zOffset); } } } MountSyncPacket package com.vals.valscraft.network; import com.vals.valscraft.entity.MountableWolfEntity; import net.minecraft.network.FriendlyByteBuf; import net.minecraft.server.level.ServerLevel; import net.minecraft.server.level.ServerPlayer; import net.minecraft.world.entity.Entity; import net.minecraft.world.entity.player.Player; import net.minecraftforge.network.NetworkEvent; import java.util.function.Supplier; public class MountSyncPacket { private final boolean isMounted; public MountSyncPacket(boolean isMounted) { this.isMounted = isMounted; } public void encode(FriendlyByteBuf buffer) { buffer.writeBoolean(isMounted); } public static MountSyncPacket decode(FriendlyByteBuf buffer) { return new MountSyncPacket(buffer.readBoolean()); } public void handle(NetworkEvent.Context context) { context.enqueueWork(() -> { ServerPlayer player = context.getSender(); // Get the player from the context if (player != null) { // Verifies if the player has dismounted if (!isMounted) { Entity vehicle = player.getVehicle(); if (vehicle instanceof MountableWolfEntity wolf) { // Logic to remove the player as a passenger wolf.removePassenger(player); 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