the terminology of this needs improvement, but...
the basic concept here is that 'type' data will persist on an itemstack, while 'state' data will not.
Type data consists of things like:
- Colour
- Coral type
- Wet/dry (sponges)
- Live/dead (coral)
- Wood type
State data consists of things like:
- Facing
- Axis
- Powered/unpowered
- Open/closed
In the past, with the old system, this information was separated by way of getStateBitmask(). This solution was fraught with problems, but achieved the basic goal: removing unwanted block properties from items.
this doesn't match the 1.16+ behaviour yet, but it at least recognizes walls that are already in the post-1.16 way and doesn't break them if not interacted with.
This commit completely revamps the way that blocks are represented in memory at runtime.
Instead of being represented by legacy Mojang block IDs and metadata, which are dated, limited and unchangeable, we now use custom PM block IDs, which are generated from VanillaBlocks.
This means we have full control of how they are assigned, which opens the doors to finally addressing inconsistencies like glazed terracotta, stripped logs handling, etc.
To represent state, BlockDataReader and BlockDataWriter have been introduced, and are used by blocks with state information to pack said information into a binary form that can be stored on a chunk at runtime.
Conceptually it's pretty similar to legacy metadata, but the actual format shares no resemblance whatsoever to legacy metadata, and is fully controlled by PM.
This means that the 'state data' may change in serialization format at any time, so it should **NOT** be stored on disk or in a config.
In the future, this will be improved using more auto-generated code and attributes, instead of hand-baked decodeState() and encodeState(). For now, this opens the gateway to a significant expansion of features.
It's not ideal, but it's a big step forwards.
fixes#4856fixes#458fixes#4529fixes#3299
Added API method Block::getSupportType(Facing) : SupportType
Added SupportType enum
fixes torch, lantern, door etc. placement on slabs and upside-down stairs
Not allowing this makes stuff like anvil damage, colour, wood type, live/dead bit, wet/dry etc all too much hassle to deal with.
Naturally I want to get rid of this shit altogether, but first it's necessary to construct a new system that we can shift into before all this bullshit can be addressed fully, so for now we have to work within the bounds of the old system.
This change will permit dynamic colours for concrete/concrete powder etc, dynamic wood types where the wood type isn't embedded in the legacy ID, and so forth. Allowing full flexibility requires either more old system hacks or completing the migration to a new system which doesn't have these limitations. I prefer to do the latter, but this change will make it somewhat easier to do.
