422 lines
12 KiB
C++
422 lines
12 KiB
C++
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#pragma once
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#include "BlockEntity.h"
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#include "../World.h"
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/// Meta values for the rail
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enum ENUM_RAIL_DIRECTIONS
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{
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E_RAIL_NORTH_SOUTH = 0,
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E_RAIL_EAST_WEST = 1,
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E_RAIL_ASCEND_EAST = 2,
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E_RAIL_ASCEND_WEST = 3,
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E_RAIL_ASCEND_NORTH = 4,
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E_RAIL_ASCEND_SOUTH = 5,
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E_RAIL_CURVED_SOUTH_EAST = 6,
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E_RAIL_CURVED_SOUTH_WEST = 7,
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E_RAIL_CURVED_NORTH_WEST = 8,
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E_RAIL_CURVED_NORTH_EAST = 9,
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// Some useful synonyms:
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E_RAIL_DIR_X = E_RAIL_EAST_WEST,
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E_RAIL_DIR_Z = E_RAIL_NORTH_SOUTH,
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E_RAIL_ASCEND_XP = E_RAIL_ASCEND_EAST,
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E_RAIL_ASCEND_XM = E_RAIL_ASCEND_WEST,
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E_RAIL_ASCEND_ZM = E_RAIL_ASCEND_NORTH,
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E_RAIL_ASCEND_ZP = E_RAIL_ASCEND_SOUTH,
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E_RAIL_CURVED_XPZP = E_RAIL_CURVED_SOUTH_EAST,
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E_RAIL_CURVED_XMZP = E_RAIL_CURVED_SOUTH_WEST,
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E_RAIL_CURVED_XMZM = E_RAIL_CURVED_NORTH_WEST,
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E_RAIL_CURVED_XPZM = E_RAIL_CURVED_NORTH_EAST,
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} ;
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enum ENUM_PURE
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{
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E_PURE_UPDOWN = 0,
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E_PURE_DOWN = 1,
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E_PURE_NONE = 2
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};
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class cBlockRailHandler :
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public cBlockHandler
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{
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public:
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cBlockRailHandler(BLOCKTYPE a_BlockType)
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: cBlockHandler(a_BlockType)
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{
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}
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virtual bool GetPlacementBlockTypeMeta(
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cWorld * a_World, cPlayer * a_Player,
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int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace,
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int a_CursorX, int a_CursorY, int a_CursorZ,
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BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
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) override
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{
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a_BlockType = m_BlockType;
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a_BlockMeta = FindMeta(a_World, a_BlockX, a_BlockY, a_BlockZ);
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return true;
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}
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virtual void OnNeighborChanged(cWorld *a_World, int a_BlockX, int a_BlockY, int a_BlockZ) override
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{
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NIBBLETYPE Meta = a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ);
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if (IsUnstable(a_World, a_BlockX, a_BlockY, a_BlockZ) && (Meta != FindMeta(a_World, a_BlockX, a_BlockY, a_BlockZ)))
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{
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a_World->FastSetBlock(a_BlockX, a_BlockY, a_BlockZ, m_BlockType, FindMeta(a_World, a_BlockX, a_BlockY, a_BlockZ));
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}
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}
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virtual bool CanBeAt(int a_RelX, int a_RelY, int a_RelZ, const cChunk & a_Chunk) override
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{
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if (a_RelY <= 0)
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{
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return false;
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}
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if (!g_BlockIsSolid[a_Chunk.GetBlock(a_RelX, a_RelY - 1, a_RelZ)])
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{
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return false;
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}
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NIBBLETYPE Meta = a_Chunk.GetMeta(a_RelX, a_RelY, a_RelZ);
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switch (Meta)
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{
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case E_RAIL_ASCEND_EAST:
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case E_RAIL_ASCEND_WEST:
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case E_RAIL_ASCEND_NORTH:
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case E_RAIL_ASCEND_SOUTH:
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{
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// Mapping between the meta and the neighbors that need checking
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Meta -= E_RAIL_ASCEND_EAST; // Base index at zero
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static const struct
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{
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int x, z;
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} Coords[] =
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{
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{ 1, 0}, // east, XP
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{-1, 0}, // west, XM
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{ 0, -1}, // north, ZM
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{ 0, 1}, // south, ZP
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} ;
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BLOCKTYPE BlockType;
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NIBBLETYPE BlockMeta;
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if (!a_Chunk.UnboundedRelGetBlock(a_RelX + Coords[Meta].x, a_RelY, a_RelZ + Coords[Meta].z, BlockType, BlockMeta))
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{
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// Too close to the edge, cannot simulate
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return true;
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}
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return g_BlockIsSolid[BlockType];
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}
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}
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return true;
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}
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NIBBLETYPE FindMeta(cWorld *a_World, int a_BlockX, int a_BlockY, int a_BlockZ)
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{
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NIBBLETYPE Meta = 0;
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char RailsCnt = 0;
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bool Neighbors[8]; // 0 - EAST, 1 - WEST, 2 - NORTH, 3 - SOUTH, 4 - EAST UP, 5 - WEST UP, 6 - NORTH UP, 7 - SOUTH UP
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memset(Neighbors, false, sizeof(Neighbors));
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Neighbors[0] = (IsUnstable(a_World, a_BlockX + 1, a_BlockY, a_BlockZ) || !IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_EAST, E_PURE_DOWN));
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Neighbors[1] = (IsUnstable(a_World, a_BlockX - 1, a_BlockY, a_BlockZ) || !IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_WEST, E_PURE_DOWN));
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Neighbors[2] = (IsUnstable(a_World, a_BlockX, a_BlockY, a_BlockZ - 1) || !IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_NORTH, E_PURE_DOWN));
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Neighbors[3] = (IsUnstable(a_World, a_BlockX, a_BlockY, a_BlockZ + 1) || !IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_SOUTH, E_PURE_DOWN));
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Neighbors[4] = (IsUnstable(a_World, a_BlockX + 1, a_BlockY + 1, a_BlockZ) || !IsNotConnected(a_World, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_EAST, E_PURE_NONE));
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Neighbors[5] = (IsUnstable(a_World, a_BlockX - 1, a_BlockY + 1, a_BlockZ) || !IsNotConnected(a_World, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_WEST, E_PURE_NONE));
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Neighbors[6] = (IsUnstable(a_World, a_BlockX, a_BlockY + 1, a_BlockZ - 1) || !IsNotConnected(a_World, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_NORTH, E_PURE_NONE));
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Neighbors[7] = (IsUnstable(a_World, a_BlockX, a_BlockY + 1, a_BlockZ + 1) || !IsNotConnected(a_World, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_SOUTH, E_PURE_NONE));
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if (IsUnstable(a_World, a_BlockX + 1, a_BlockY - 1, a_BlockZ) || !IsNotConnected(a_World, a_BlockX, a_BlockY - 1, a_BlockZ, BLOCK_FACE_EAST))
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Neighbors[0] = true;
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if (IsUnstable(a_World, a_BlockX - 1, a_BlockY - 1, a_BlockZ) || !IsNotConnected(a_World, a_BlockX, a_BlockY - 1, a_BlockZ, BLOCK_FACE_WEST))
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Neighbors[1] = true;
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if (IsUnstable(a_World, a_BlockX, a_BlockY - 1, a_BlockZ - 1) || !IsNotConnected(a_World, a_BlockX, a_BlockY - 1, a_BlockZ, BLOCK_FACE_NORTH))
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Neighbors[2] = true;
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if (IsUnstable(a_World, a_BlockX, a_BlockY - 1, a_BlockZ + 1) || !IsNotConnected(a_World, a_BlockX, a_BlockY - 1, a_BlockZ, BLOCK_FACE_SOUTH))
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Neighbors[3] = true;
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for (int i = 0; i < 8; i++)
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{
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if (Neighbors[i])
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{
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RailsCnt++;
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}
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}
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if (RailsCnt == 1)
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{
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if (Neighbors[7]) return E_RAIL_ASCEND_SOUTH;
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else if (Neighbors[6]) return E_RAIL_ASCEND_NORTH;
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else if (Neighbors[5]) return E_RAIL_ASCEND_WEST;
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else if (Neighbors[4]) return E_RAIL_ASCEND_EAST;
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else if (Neighbors[0] || Neighbors[1]) return E_RAIL_EAST_WEST;
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else if (Neighbors[2] || Neighbors[3]) return E_RAIL_NORTH_SOUTH;
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ASSERT(!"Weird neighbor count");
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return Meta;
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}
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for (int i = 0; i < 4; i++)
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{
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if (Neighbors[i + 4])
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{
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Neighbors[i] = true;
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}
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}
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if (RailsCnt > 1)
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{
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if (Neighbors[3] && Neighbors[0]) return E_RAIL_CURVED_SOUTH_EAST;
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else if (Neighbors[3] && Neighbors[1]) return E_RAIL_CURVED_SOUTH_WEST;
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else if (Neighbors[2] && Neighbors[0]) return E_RAIL_CURVED_NORTH_EAST;
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else if (Neighbors[2] && Neighbors[1]) return E_RAIL_CURVED_NORTH_WEST;
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else if (Neighbors[7] && Neighbors[2]) return E_RAIL_ASCEND_SOUTH;
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else if (Neighbors[3] && Neighbors[6]) return E_RAIL_ASCEND_NORTH;
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else if (Neighbors[5] && Neighbors[0]) return E_RAIL_ASCEND_WEST;
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else if (Neighbors[4] && Neighbors[1]) return E_RAIL_ASCEND_EAST;
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else if (Neighbors[0] && Neighbors[1]) return E_RAIL_EAST_WEST;
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else if (Neighbors[2] && Neighbors[3]) return E_RAIL_NORTH_SOUTH;
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ASSERT(!"Weird neighbor count");
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}
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return Meta;
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}
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bool IsUnstable(cWorld * a_World, int a_BlockX, int a_BlockY, int a_BlockZ)
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{
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if (a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) != E_BLOCK_RAIL)
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{
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return false;
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}
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NIBBLETYPE Meta = a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ);
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switch (Meta)
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{
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case E_RAIL_NORTH_SOUTH:
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{
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if (
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_NORTH, E_PURE_DOWN) ||
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_SOUTH, E_PURE_DOWN)
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)
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{
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return true;
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}
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break;
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}
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case E_RAIL_EAST_WEST:
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{
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if (
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_EAST, E_PURE_DOWN) ||
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_WEST, E_PURE_DOWN)
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)
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{
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return true;
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}
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break;
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}
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case E_RAIL_ASCEND_EAST:
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{
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if (
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IsNotConnected(a_World, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_EAST) ||
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_WEST)
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)
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{
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return true;
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}
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break;
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}
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case E_RAIL_ASCEND_WEST:
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{
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if (
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_EAST) ||
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IsNotConnected(a_World, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_WEST)
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)
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{
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return true;
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}
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break;
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}
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case E_RAIL_ASCEND_NORTH:
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{
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if (
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IsNotConnected(a_World, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_NORTH) ||
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_SOUTH)
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)
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{
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return true;
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}
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break;
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}
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case E_RAIL_ASCEND_SOUTH:
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{
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if (
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_NORTH) ||
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IsNotConnected(a_World, a_BlockX, a_BlockY + 1, a_BlockZ, BLOCK_FACE_SOUTH)
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)
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{
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return true;
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}
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break;
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}
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case E_RAIL_CURVED_SOUTH_EAST:
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{
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if (
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_SOUTH) ||
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_EAST)
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)
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{
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return true;
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}
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break;
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}
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case E_RAIL_CURVED_SOUTH_WEST:
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{
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if (
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_SOUTH) ||
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_WEST)
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)
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{
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return true;
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}
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break;
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}
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case E_RAIL_CURVED_NORTH_WEST:
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{
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if (
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_NORTH) ||
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_WEST)
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)
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{
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return true;
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}
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break;
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}
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case E_RAIL_CURVED_NORTH_EAST:
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{
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if (
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_NORTH) ||
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IsNotConnected(a_World, a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_EAST)
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)
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{
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return true;
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}
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break;
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}
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}
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return false;
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}
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bool IsNotConnected(cWorld * a_World, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, char a_Pure = 0)
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{
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AddFaceDirection(a_BlockX, a_BlockY, a_BlockZ, a_BlockFace, false);
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NIBBLETYPE Meta;
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if (a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) != E_BLOCK_RAIL)
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{
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if ((a_World->GetBlock(a_BlockX, a_BlockY + 1, a_BlockZ) != E_BLOCK_RAIL) || (a_Pure != E_PURE_UPDOWN))
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{
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if ((a_World->GetBlock(a_BlockX, a_BlockY - 1, a_BlockZ) != E_BLOCK_RAIL) || (a_Pure == E_PURE_NONE))
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{
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return true;
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}
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else
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{
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Meta = a_World->GetBlockMeta(a_BlockX, a_BlockY - 1, a_BlockZ);
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}
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}
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else
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{
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Meta = a_World->GetBlockMeta(a_BlockX, a_BlockY + 1, a_BlockZ);
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}
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}
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else
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{
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Meta = a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ);
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}
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switch (a_BlockFace)
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{
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case BLOCK_FACE_NORTH:
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{
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if (
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(Meta == E_RAIL_NORTH_SOUTH) ||
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(Meta == E_RAIL_ASCEND_NORTH) ||
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(Meta == E_RAIL_ASCEND_SOUTH) ||
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(Meta == E_RAIL_CURVED_SOUTH_EAST) ||
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(Meta == E_RAIL_CURVED_SOUTH_WEST)
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)
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{
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return false;
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}
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break;
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}
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case BLOCK_FACE_SOUTH:
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{
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if (
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(Meta == E_RAIL_NORTH_SOUTH) ||
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(Meta == E_RAIL_ASCEND_NORTH) ||
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(Meta == E_RAIL_ASCEND_SOUTH) ||
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(Meta == E_RAIL_CURVED_NORTH_EAST) ||
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(Meta == E_RAIL_CURVED_NORTH_WEST)
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)
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{
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return false;
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}
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break;
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}
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case BLOCK_FACE_EAST:
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{
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if (
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(Meta == E_RAIL_EAST_WEST) ||
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(Meta == E_RAIL_ASCEND_EAST) ||
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(Meta == E_RAIL_ASCEND_WEST) ||
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(Meta == E_RAIL_CURVED_SOUTH_WEST) ||
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(Meta == E_RAIL_CURVED_NORTH_WEST)
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)
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{
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return false;
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}
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break;
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}
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case BLOCK_FACE_WEST:
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{
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if (
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(Meta == E_RAIL_EAST_WEST) ||
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(Meta == E_RAIL_ASCEND_EAST) ||
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(Meta == E_RAIL_ASCEND_WEST) ||
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(Meta == E_RAIL_CURVED_SOUTH_EAST) ||
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(Meta == E_RAIL_CURVED_NORTH_EAST)
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)
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{
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return false;
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}
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break;
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}
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}
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return true;
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}
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} ;
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