Worldgen API v0

[paulevsGitch]

This is a prototype of worldgen API.

Implemented features:

• Controllable biome distribution in Overworld and the Nether
• Customizable colors for grass and leaves in biomes

Planned features:

• Biome fog color
• Surface builders
• (Potentially) Terrain generator changes in biomes
• (Potentially) Feature scatters in biomes
• (Potentially) Biome builder

How biome distribution works:
Original in-game biomes uses temperature and wetness (humidity) for distribution, which makes adding custom biomes problematic. To solve that issue world was divided into Biome Regions, each region will generate only specific biomes. By default there is only one region in both Nether and End, you can add biomes directly into them or add a separate regions for modded biomes (which can have temperature/wetness distribution and will not break vanilla generation)

Example of vanilla biomes:

Vanilla biomes with two custom biomes (edge + central):

Several mod regions:

Several biomes added into Nether region

Biome colors (grass and leaves, separately) are done with BiomeColorProviders, you can use single color for biome foliage or define a custom function:

[paulevsGitch]

There is an example of how it works in test mod: TestWorldgenListener

[paulevsGitch]

Preview of surface rules, here is an example of slope surface rule, depth surface rule and filler

[mineLdiver]

Tabs?

[paulevsGitch]

Original file have spaces, and Idea just keep file in the same format

[mineLdiver]

After these are resolved, if this pull request is feature-complete, I think I'll merge.

[mineLdiver]

Some mistakes.

Also, this doesn't require any additional multiplayer code, right? Because everything is based on the world's seed. Or does it need extra work for multiplayer?

[paulevsGitch]

Also, this doesn't require any additional multiplayer code, right? Because everything is based on the world's seed.

Yes, all computations are based on world seed and biomes are registered on both client and server

[mineLdiver]

If these features are final, let's get this merged