151 lines
3.5 KiB
C++
151 lines
3.5 KiB
C++
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#pragma once
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#include "BlockHandler.h"
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#include "Mixins.h"
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class cBlockLadderHandler:
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public cClearMetaOnDrop<cMetaRotator<cBlockHandler, 0x07, 0x02, 0x05, 0x03, 0x04> >
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{
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using Super = cClearMetaOnDrop<cMetaRotator<cBlockHandler, 0x07, 0x02, 0x05, 0x03, 0x04>>;
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public:
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using Super::Super;
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private:
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virtual bool GetPlacementBlockTypeMeta(
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cChunkInterface & a_ChunkInterface,
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cPlayer & a_Player,
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const Vector3i a_PlacedBlockPos,
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eBlockFace a_ClickedBlockFace,
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const Vector3i a_CursorPos,
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BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
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) const override
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{
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// Try finding a suitable neighbor block face for the ladder; start with the given one.
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if (!LadderCanBePlacedAt(a_ChunkInterface, a_PlacedBlockPos, a_ClickedBlockFace))
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{
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a_ClickedBlockFace = FindSuitableBlockFace(a_ChunkInterface, a_PlacedBlockPos);
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if (a_ClickedBlockFace == BLOCK_FACE_NONE)
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{
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return false;
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}
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}
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a_BlockType = m_BlockType;
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a_BlockMeta = BlockFaceToMetaData(a_ClickedBlockFace);
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return true;
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}
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/** Converts the block face of the neighbor to which the ladder is attached to the ladder block's meta. */
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static NIBBLETYPE BlockFaceToMetaData(eBlockFace a_NeighborBlockFace)
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{
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switch (a_NeighborBlockFace)
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{
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case BLOCK_FACE_ZM: return 0x2;
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case BLOCK_FACE_ZP: return 0x3;
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case BLOCK_FACE_XM: return 0x4;
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case BLOCK_FACE_XP: return 0x5;
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case BLOCK_FACE_NONE:
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case BLOCK_FACE_YM:
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case BLOCK_FACE_YP:
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{
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return 0x2;
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}
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}
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UNREACHABLE("Unsupported neighbor block face");
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}
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/** Converts the ladder block's meta to the block face of the neighbor to which the ladder is attached. */
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static eBlockFace MetaDataToBlockFace(NIBBLETYPE a_MetaData)
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{
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switch (a_MetaData)
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{
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case 0x2: return BLOCK_FACE_ZM;
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case 0x3: return BLOCK_FACE_ZP;
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case 0x4: return BLOCK_FACE_XM;
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case 0x5: return BLOCK_FACE_XP;
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default: return BLOCK_FACE_ZM;
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}
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}
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/** Finds a suitable block face value for the Ladder.
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The returned value is the block face of the neighbor of the specified block to which a ladder at a_LadderPos can be attached.
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Returns BLOCK_FACE_NONE if no valid location is found */
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static eBlockFace FindSuitableBlockFace(cChunkInterface & a_ChunkInterface, const Vector3i a_LadderPos)
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{
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for (int FaceInt = BLOCK_FACE_ZM; FaceInt <= BLOCK_FACE_XP; FaceInt++)
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{
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eBlockFace Face = static_cast<eBlockFace>(FaceInt);
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if (LadderCanBePlacedAt(a_ChunkInterface, a_LadderPos, Face))
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{
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return Face;
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}
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}
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return BLOCK_FACE_NONE;
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}
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/** Returns true if the ladder in the specified position will be supported by its neghbor through the specified neighbor's blockface. */
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static bool LadderCanBePlacedAt(cChunkInterface & a_ChunkInterface, const Vector3i a_LadderPos, eBlockFace a_NeighborBlockFace)
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{
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if (
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(a_NeighborBlockFace == BLOCK_FACE_NONE) ||
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(a_NeighborBlockFace == BLOCK_FACE_BOTTOM) ||
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(a_NeighborBlockFace == BLOCK_FACE_TOP)
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)
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{
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return false;
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}
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auto NeighborPos = AddFaceDirection(a_LadderPos, a_NeighborBlockFace, true);
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return cBlockInfo::IsSolid(a_ChunkInterface.GetBlock(NeighborPos));
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}
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virtual bool CanBeAt(cChunkInterface & a_ChunkInterface, const Vector3i a_RelPos, const cChunk & a_Chunk) const override
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{
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auto NeighborBlockFace = MetaDataToBlockFace(a_Chunk.GetMeta(a_RelPos));
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auto LadderAbsPos = a_Chunk.RelativeToAbsolute(a_RelPos);
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return LadderCanBePlacedAt(a_ChunkInterface, LadderAbsPos, NeighborBlockFace);
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}
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virtual ColourID GetMapBaseColourID(NIBBLETYPE a_Meta) const override
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{
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UNUSED(a_Meta);
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return 0;
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}
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} ;
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