#pragma once #include "BlockHandler.h" #include "../BlockInfo.h" #include "../Chunk.h" #include "Mixins.h" #include "ChunkInterface.h" class cBlockButtonHandler : public cClearMetaOnDrop> { using Super = cClearMetaOnDrop>; public: using Super::Super; /** Extracts the ON bit from metadata and returns if true if it is set */ static bool IsButtonOn(NIBBLETYPE a_Meta) { return (a_Meta & 0x08) == 0x08; } /** Event handler for an arrow striking a block. Performs appropriate handling if the arrow intersected a wooden button. */ static void OnArrowHit(cWorld & a_World, const Vector3i a_Position, const eBlockFace a_HitFace) { BLOCKTYPE Type; NIBBLETYPE Meta; const auto Pos = AddFaceDirection(a_Position, a_HitFace); if ( !a_World.GetBlockTypeMeta(Pos, Type, Meta) || IsButtonOn(Meta) || !IsButtonPressedByArrow(a_World, Pos, Type, Meta) ) { // Bail if we're not specifically a wooden button, or it's already on // or if the arrow didn't intersect. It is very important that nothing is // done if the button is depressed, since the release task will already be queued return; } a_World.SetBlockMeta(Pos, Meta | 0x08); a_World.WakeUpSimulators(Pos); // sound name is ok to be wood, because only wood gets triggered by arrow a_World.GetBroadcastManager().BroadcastSoundEffect("block.wood_button.click_on", Pos, 0.5f, 0.6f); // Queue a button reset QueueButtonRelease(a_World, Pos, Type); } private: virtual bool OnUse( cChunkInterface & a_ChunkInterface, cWorldInterface & a_WorldInterface, cPlayer & a_Player, const Vector3i a_BlockPos, eBlockFace a_BlockFace, const Vector3i a_CursorPos ) const override { NIBBLETYPE Meta = a_ChunkInterface.GetBlockMeta(a_BlockPos); // If button is already on, do nothing: if (IsButtonOn(Meta)) { return false; } // Set the ON bit to on Meta |= 0x08; const auto SoundToPlay = (m_BlockType == E_BLOCK_STONE_BUTTON) ? "block.stone_button.click_on" : "block.wood_button.click_on"; a_ChunkInterface.SetBlockMeta(a_BlockPos, Meta); a_WorldInterface.WakeUpSimulators(a_BlockPos); a_WorldInterface.GetBroadcastManager().BroadcastSoundEffect(SoundToPlay, a_BlockPos, 0.5f, 0.6f, a_Player.GetClientHandle()); // Queue a button reset (unpress) QueueButtonRelease(*a_Player.GetWorld(), a_BlockPos, m_BlockType); return true; } virtual bool IsUseable(void) const override { return true; } virtual bool GetPlacementBlockTypeMeta( cChunkInterface & a_ChunkInterface, cPlayer & a_Player, const Vector3i a_PlacedBlockPos, eBlockFace a_ClickedBlockFace, const Vector3i a_CursorPos, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta ) const override { a_BlockType = m_BlockType; a_BlockMeta = BlockFaceToMetaData(a_ClickedBlockFace); return true; } /** Converts the block face of the neighbor to which the button is attached, to the block meta for this button. */ inline static NIBBLETYPE BlockFaceToMetaData(eBlockFace a_BlockFace) { switch (a_BlockFace) { case BLOCK_FACE_YP: return 0x5; case BLOCK_FACE_ZM: return 0x4; case BLOCK_FACE_ZP: return 0x3; case BLOCK_FACE_XM: return 0x2; case BLOCK_FACE_XP: return 0x1; case BLOCK_FACE_YM: return 0x0; case BLOCK_FACE_NONE: { ASSERT(!"Unhandled block face!"); return 0x0; } } UNREACHABLE("Unsupported block face"); } /** Converts the block meta of this button into a block face of the neighbor to which the button is attached. */ inline static eBlockFace BlockMetaDataToBlockFace(NIBBLETYPE a_Meta) { switch (a_Meta & 0x7) { case 0x0: return BLOCK_FACE_YM; case 0x1: return BLOCK_FACE_XP; case 0x2: return BLOCK_FACE_XM; case 0x3: return BLOCK_FACE_ZP; case 0x4: return BLOCK_FACE_ZM; case 0x5: return BLOCK_FACE_YP; default: { ASSERT(!"Unhandled block meta!"); return BLOCK_FACE_NONE; } } } virtual bool CanBeAt(cChunkInterface & a_ChunkInterface, const Vector3i a_RelPos, const cChunk & a_Chunk) const override { auto Meta = a_Chunk.GetMeta(a_RelPos); auto SupportRelPos = AddFaceDirection(a_RelPos, BlockMetaDataToBlockFace(Meta), true); if (!cChunkDef::IsValidHeight(SupportRelPos.y)) { return false; } BLOCKTYPE SupportBlockType; a_Chunk.UnboundedRelGetBlockType(SupportRelPos, SupportBlockType); return cBlockInfo::FullyOccupiesVoxel(SupportBlockType); } virtual ColourID GetMapBaseColourID(NIBBLETYPE a_Meta) const override { UNUSED(a_Meta); return 0; } /** Schedules a recurring event at appropriate intervals to release a button at a given position. The given block type is checked when the task is executed to ensure the position still contains a button. */ static void QueueButtonRelease(cWorld & a_ButtonWorld, const Vector3i a_Position, const BLOCKTYPE a_BlockType) { const auto TickDelay = (a_BlockType == E_BLOCK_STONE_BUTTON) ? 20 : 30; a_ButtonWorld.ScheduleTask( TickDelay, [a_Position, a_BlockType](cWorld & a_World) { BLOCKTYPE Type; NIBBLETYPE Meta; if ( !a_World.GetBlockTypeMeta(a_Position, Type, Meta) || (Type != a_BlockType) || !IsButtonOn(Meta) ) { // Total failure or block changed, bail return; } if (IsButtonPressedByArrow(a_World, a_Position, Type, Meta)) { // Try again in a little while QueueButtonRelease(a_World, a_Position, a_BlockType); return; } // Block hasn't change in the meantime; release it const auto SoundToPlayOnRelease = (Type == E_BLOCK_STONE_BUTTON) ? "block.stone_button.click_off" : "block.wood_button.click_off"; a_World.SetBlockMeta(a_Position, Meta & 0x07); a_World.WakeUpSimulators(a_Position); a_World.BroadcastSoundEffect(SoundToPlayOnRelease, a_Position, 0.5f, 0.5f); } ); } /** Returns true if an arrow was found in the wooden button */ static bool IsButtonPressedByArrow(cWorld & a_World, const Vector3i a_ButtonPosition, const BLOCKTYPE a_BlockType, const NIBBLETYPE a_Meta) { if (a_BlockType != E_BLOCK_WOODEN_BUTTON) { return false; } const auto FaceOffset = GetButtonOffsetOnBlock(a_Meta); const bool FoundArrow = !a_World.ForEachEntityInBox( cBoundingBox(FaceOffset + a_ButtonPosition, 0.2, 0.2), [](cEntity & a_Entity) { return a_Entity.IsArrow(); } ); return FoundArrow; } /** Returns an offset to the integer world coordinates of a button. Applying this offset yields the centre of the button's bounding box, in terms of the position within the block the button with given meta occupies. TODO: this is only approximate, return the exact bbox instead. */ static Vector3d GetButtonOffsetOnBlock(NIBBLETYPE a_Meta) { switch (BlockMetaDataToBlockFace(a_Meta)) { case BLOCK_FACE_YM: return { 0.5, 1, 0.5 }; case BLOCK_FACE_XP: return { 0, 0.5, 0.5 }; case BLOCK_FACE_XM: return { 1, 0.5, 0.5 }; case BLOCK_FACE_ZP: return { 0.5, 0.5, 0 }; case BLOCK_FACE_ZM: return { 0.5, 0.5, 1 }; case BLOCK_FACE_YP: return { 0.5, 0, 0.5 }; case BLOCK_FACE_NONE: { ASSERT(!"Unhandled block face!"); return { 0, 0, 0 }; } } UNREACHABLE(!"Unhandled block face!"); } } ;