1 files changed, 56 insertions, 0 deletions
diff --git a/mapblk.go b/mapblk.go
new file mode 100644
index 0000000..f40a504
--- /dev/null
+++ b/mapblk.go
@@ -0,0 +1,56 @@
+package mt
+
+type MapBlkFlags uint8
+
+const (
+	BlkIsUnderground MapBlkFlags = 1 << iota
+	BlkDayNightDiff
+	BlkLightExpired
+	BlkNotGenerated
+)
+
+type LitFromBlks uint16
+
+const AlwaysLitFrom LitFromBlks = 0xf000
+
+func LitFrom(d Dir, b LightBank) LitFromBlks {
+	return 1 << (uint8(d) + uint8(6*b))
+}
+
+type MapBlk struct {
+	Flags   MapBlkFlags
+	LitFrom LitFromBlks
+
+	//mt:const uint8(2)     // Size of param0 in bytes.
+	//mt:const uint8(1 + 1) // Size of param1 and param2 combined, in bytes.
+
+	//mt:zlib
+	Param0 [4096]Content
+	Param1 [4096]uint8
+	Param2 [4096]uint8
+	//mt:end
+
+	NodeMetas map[uint16]*NodeMeta
+
+	// net info
+	//mt:const uint8(2) // version
+}
+
+// Pos2BlkPos converts a node position to a MapBlk position and index.
+func Pos2Blkpos(pos [3]int16) (blkpos [3]int16, i uint16) {
+	for j := range pos {
+		blkpos[j] = pos[j] >> 4
+		i |= uint16(pos[j]&0xf) << (4 * j)
+	}
+
+	return
+}
+
+// BlkPos2Pos converts a MapBlk position and index to a node position.
+func Blkpos2Pos(blkpos [3]int16, i uint16) (pos [3]int16) {
+	for j := range pos {
+		pos[j] = blkpos[j]<<4 | int16(i>>(4*j)&0xf)
+	}
+
+	return
+}