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GregTech-Modern KNOWLEDGE BASE

OVERVIEW

GregTech-Modern is the vendored GTCEu upstream project used as CTNH's API/runtime dependency and reference implementation. Treat it as upstream code first, local code second.

WHERE TO LOOK

  • Addon API: src/main/java/com/gregtechceu/gtceu/api/addon/GTAddon.java, IGTAddon.java. CTNH modules implement addon hooks against these APIs.
  • Material APIs: src/main/java/com/gregtechceu/gtceu/api/data/chemical/. Material registries, properties, tag prefixes.
  • Machine APIs: src/main/java/com/gregtechceu/gtceu/api/machine/. Machine definitions and behavior base classes.
  • Recipe APIs: src/main/java/com/gregtechceu/gtceu/api/recipe/. Recipe types, capabilities, modifiers.
  • Datagen/reference data: src/main/java/com/gregtechceu/gtceu/data/, src/generated/resources. Upstream-generated resources and providers.
  • Tests: src/test/java. Only test suite currently present in the workspace.
  • Version catalogs: gradle/libs.versions.toml, gradle/forge.versions.toml. Root settings.gradle imports these catalogs.

COMMON GTCEu API QUICK REFERENCE

  • IGTAddon: api/addon/IGTAddon.java. Addon lifecycle hooks: getRegistrate(), initializeAddon(), addonModId(), registerTagPrefixes(), registerElements(), registerRecipeCapabilities(), addRecipes(), removeRecipes(), ore/fluid vein hooks, and KubeJS recipe key registration.
  • GTAddon: api/addon/GTAddon.java. Annotation used by GTCEu to discover addon implementations.
  • MachineDefinition: api/machine/MachineDefinition.java. Registered machine definition; exposes block/item/block entity suppliers, createMetaMachine(), asStack(), shape, tier, recipe modifier, UI, tooltip, and render state settings.
  • MultiblockMachineDefinition: api/machine/MultiblockMachineDefinition.java. Multiblock-specific machine definition; adds patternFactory, preview shapes, generator flag, flip rules, recovery items, part sorting, part appearance, and additional display hooks.
  • MetaMachine / IMachineBlockEntity: api/machine/MetaMachine.java, api/machine/IMachineBlockEntity.java. Runtime machine object and block-entity bridge used by machine behavior code.
  • WorkableElectricMultiblockMachine: api/machine/multiblock/WorkableElectricMultiblockMachine.java. Common base for electric multiblocks with recipe logic.
  • PartAbility: api/machine/multiblock/PartAbility.java. Multiblock part capability registry: item/fluid import/export, energy hatches, maintenance, muffler, parallel hatch, laser, computation/data abilities; maps tiers to valid part blocks.
  • GTRecipe / GTRecipeType: api/recipe/GTRecipe.java, api/recipe/GTRecipeType.java. Runtime recipe object and recipe type definition; use when inspecting processing, UI limits, categories, and capability maps.
  • RecipeModifier: api/recipe/modifier/RecipeModifier.java. Functional interface returning a ModifierFunction for a machine and recipe; applyModifier() returns a modified recipe copy or null.
  • RecipeCapability<T>: api/capability/recipe/RecipeCapability.java. Capability abstraction for recipe inputs/outputs; controls KubeJS conversion, slot names, matching, parallel limits, XEI widgets, and distinct-bypass behavior.
  • Material: api/data/chemical/material/Material.java. Material data model; check properties, flags, components, formula, color/icon set, and generated item/fluid/block behavior.
  • MaterialRegistry: api/data/chemical/material/registry/MaterialRegistry.java. Registry container for materials; CTNH material registration should respect GTCEu event/addon lifecycle.
  • TagPrefix: api/data/tag/TagPrefix.java. Material item/block prefix definition; controls generated tags/items/blocks, ignored materials, material amount overrides, and localization keys.
  • BlockPattern / TraceabilityPredicate: api/pattern/BlockPattern.java, api/pattern/TraceabilityPredicate.java. Multiblock structure matching and predicate DSL; includes global/layer limits, preview count, IO marking, render masking, and NBT parser metadata.
  • MultiblockShapeInfo: api/pattern/MultiblockShapeInfo.java. XEI/preview shape representation; used by multiblock definitions and pattern previews.

REGISTRATION ENTRYPOINTS

  • Core registries: api/registry/GTRegistries.java, api/registry/GTRegistry.java, api/registry/registrate/GTRegistrate.java.
  • Upstream content registries: common/data/GTItems.java, GTBlocks.java, GTMachines.java, GTRecipeTypes.java, GTMaterials.java, GTElements.java, GTFluids.java, GTCreativeModeTabs.java, GTEntityTypes.java.
  • Machine builders: api/registry/registrate/MachineBuilder.java, MultiblockMachineBuilder.java.
  • Recipe infrastructure: api/recipe/GTRecipe.java, GTRecipeType.java, api/recipe/modifier/, api/capability/recipe/.
  • Material/tag APIs: api/data/chemical/material/, api/data/tag/TagPrefix.java; generated material content is driven from these APIs and common data registries.
  • Datagen providers: data/ and api/registry/registrate/provider/; prefer these over hand-editing generated resources.

CONVENTIONS

  • Namespace is com.gregtechceu.gtceu.
  • This project has its own Gradle configuration and is excluded from root ctnhSubprojects shared CTNH plugin setup.
  • Generated and resource directories are much larger than CTNH modules; narrow searches before editing.
  • Prefer reading GTCEu APIs from here instead of guessing addon contracts in CTNH modules.

COMMANDS

./gradlew :modules:GregTech-Modern:build
./gradlew :modules:GregTech-Modern:test

ANTI-PATTERNS

  • Do not make incidental style or API changes here while working on CTNH modules.
  • Do not assume CTNH root Spotless/moddev settings apply to this project.
  • Do not update vendored upstream behavior unless the task explicitly targets GTCEu internals or a required local compatibility patch.