Slabbed

[0.4.2-beta.2] - Minecraft 1.21.1 (NeoForge)

Carries the 0.4.2 parity-candidate work for this port plus a render-path performance cleanup. Build metadata was corrected from +26.2 to +1.21.1, the actual target Minecraft version.

Performance

• Removed always-on per-block work from the chunk-mesh render path: the full-mesh-bounds diagnostic sampler no longer does a block-registry lookup, string allocations, and an atomic increment per block before checking its trace flag.
• The per-vertex bounds loop is now skipped entirely unless the trace is armed.
• Render trace flags are read once at class-load instead of per block; render.offset.trace stays live but is gated cheap-first.
• This is zero behavior change and matters most under Sodium, which routes all block geometry through this path.

Developer

• /slabdy overlay now starts off by default in release/profile launches.
• It remains toggleable in-game, but the initial state is false unless explicitly enabled with -Dslabbed.targetDyOverlay=true.

Known limitations

• A face-culling / shadow artifact beside a lowered full-block ↔ vanilla-slab boundary is deferred to a later render/culling slice.
• Full Terrain Slabs named-surface support is not in this build; Terrain Slabs blocks are kept un-offset and otherwise behave as vanilla support.
• No all-item or all-partial-block support claim is made for this beta.