added NPCs; added tdata submodule

- use environment variable TDATA_PATH to specify the location of the
  tdata directory

core/entity/npc.go

@@ -0,0 +1,84 @@
+package entity
+
+import "github.com/CPunch/gopenfusion/core/protocol"
+
+type NPC struct {
+	ID      int
+	X       int `json:"iX"`
+	Y       int `json:"iY"`
+	Z       int `json:"iZ"`
+	Angle   int `json:"iAngle"`
+	NPCType int `json:"iNPCType"`
+	Chunk   ChunkPosition
+}
+
+var nextNPCID = 0
+
+func NewNPC(X, Y, Z, Angle int, npcType int) *NPC {
+	nextNPCID++
+	return &NPC{
+		ID:      nextNPCID,
+		X:       X,
+		Y:       Y,
+		Z:       Z,
+		Angle:   Angle,
+		NPCType: npcType,
+		Chunk:   MakeChunkPosition(X, Y),
+	}
+}
+
+// ==================== Entity interface ====================
+
+func (npc *NPC) GetKind() EntityKind {
+	return ENTITY_KIND_NPC
+}
+
+func (npc *NPC) GetChunk() ChunkPosition {
+	return npc.Chunk
+}
+
+func (npc *NPC) GetPosition() (x int, y int, z int) {
+	return npc.X, npc.Y, npc.Z
+}
+
+func (npc *NPC) GetAngle() int {
+	return npc.Angle
+}
+
+func (npc *NPC) SetChunk(chunk ChunkPosition) {
+	npc.Chunk = chunk
+}
+
+func (npc *NPC) SetPosition(x, y, z int) {
+	npc.X = x
+	npc.Y = y
+	npc.Z = z
+}
+
+func (npc *NPC) SetAngle(angle int) {
+	npc.Angle = angle
+}
+
+func (npc *NPC) DisappearFromViewOf(peer *protocol.CNPeer) {
+	peer.Send(protocol.P_FE2CL_NPC_EXIT, protocol.SP_FE2CL_NPC_EXIT{
+		INPC_ID: int32(npc.ID),
+	})
+}
+
+func (npc *NPC) EnterIntoViewOf(peer *protocol.CNPeer) {
+	peer.Send(protocol.P_FE2CL_NPC_NEW, protocol.SP_FE2CL_NPC_NEW{
+		NPCAppearanceData: npc.GetAppearanceData(),
+	})
+}
+
+func (npc *NPC) GetAppearanceData() protocol.SNPCAppearanceData {
+	return protocol.SNPCAppearanceData{
+		INPC_ID:  int32(npc.ID),
+		INPCType: int32(npc.NPCType),
+		IHP:      100,
+		IX:       int32(npc.X),
+		IY:       int32(npc.Y),
+		IZ:       int32(npc.Z),
+		IAngle:   int32(npc.Angle),
+	}
+}