1.21.6 Clientbound PlayState Packets

codec/packet/game/client/sections_blocks_update.go

@@ -0,0 +1,35 @@
+package client
+
+//codec:gen
+type UpdateSectionsBlocks struct {
+	ChunkSectionPosition int64
+	Blocks               []int64 `mc:"VarLong"`
+}
+
+func (s *UpdateSectionsBlocks) SetSectionPos(x, y, z int32) {
+	s.ChunkSectionPosition = ((int64(x) & 0x3FFFFF) << 42) | (int64(y) & 0xFFFFF) | ((int64(z) & 0x3FFFFF) << 20)
+}
+
+func (s UpdateSectionsBlocks) ToSectionPos() (x, y, z int32) {
+	sectionX := int32(s.ChunkSectionPosition >> 42)
+	sectionY := int32(s.ChunkSectionPosition << 44 >> 44)
+	sectionZ := int32(s.ChunkSectionPosition >> 22 >> 42)
+	return sectionX, sectionY, sectionZ
+}
+
+func (s *UpdateSectionsBlocks) AddBlock(x, y, z int, stateID int32) {
+	s.Blocks = append(s.Blocks, int64(stateID)<<12|(int64(x)<<8|int64(y)<<4|int64(z)))
+}
+
+func (s UpdateSectionsBlocks) ParseBlocks() map[[3]int32]int32 {
+	m := make(map[[3]int32]int32)
+	for _, block := range s.Blocks {
+		blockStateId := block >> 12
+		blockLocalX := (block >> 8) & 0xF
+		blockLocalY := block & 0xF
+		blockLocalZ := (block >> 4) & 0xF
+
+		m[[3]int32{int32(blockLocalX), int32(blockLocalY), int32(blockLocalZ)}] = int32(blockStateId)
+	}
+	return m
+}