a7bb9496ae
Vanilla-faithful overworld generator (final_density + multi-noise biomes), full connection lifecycle (status/login/configuration/play), chunk streaming, creative block editing, and the protocol/nbt/registry infrastructure.
45 lines
1.4 KiB
Go
45 lines
1.4 KiB
Go
package world
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import "regionio/internal/protocol"
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// lightSections is the number of light subchunks: one below the world and one
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// above, plus one per block section.
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const lightSections = SectionCount + 2
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// writeLight emits a fully-lit sky: every light section carries sky light 15,
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// and block light is reported as uniformly empty. This avoids a black world
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// without implementing real light propagation (deferred).
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func (c *Chunk) writeLight(w *protocol.Writer) {
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full := allSectionsMask()
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writeBitSet(w, full) // sky light mask: all sections present
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writeBitSet(w, nil) // block light mask: none present
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writeBitSet(w, nil) // empty sky light mask: none empty
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writeBitSet(w, full) // empty block light mask: all empty
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// Sky light arrays: one 2048-byte (4096 nibbles) array of 0x0F per section.
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bright := make([]byte, 2048)
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for i := range bright {
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bright[i] = 0xFF // two nibbles of 15
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}
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w.VarInt(lightSections)
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for i := 0; i < lightSections; i++ {
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w.VarInt(2048)
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w.Raw(bright)
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}
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w.VarInt(0) // no block light arrays
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}
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// allSectionsMask returns a bitset (as longs) with the low lightSections bits set.
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func allSectionsMask() []uint64 {
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return []uint64{(uint64(1) << lightSections) - 1}
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}
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// writeBitSet emits a length-prefixed array of longs.
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func writeBitSet(w *protocol.Writer, longs []uint64) {
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w.VarInt(int32(len(longs)))
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for _, v := range longs {
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w.Int64(int64(v))
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}
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}
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