348 lines
9.0 KiB
C++
348 lines
9.0 KiB
C++
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#include "Globals.h"
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#include "BlockPiston.h"
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#include "../BlockInfo.h"
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#include "../Item.h"
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#include "../World.h"
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#include "../Entities/Player.h"
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#include "../BlockInServerPluginInterface.h"
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#include "ChunkInterface.h"
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#define PISTON_MAX_PUSH_DISTANCE 12
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Vector3i cBlockPistonHandler::MetadataToOffset(NIBBLETYPE a_PistonMeta)
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{
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switch (a_PistonMeta & 0x07)
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{
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case 0: return Vector3i( 0, -1, 0);
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case 1: return Vector3i( 0, 1, 0);
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case 2: return Vector3i( 0, 0, -1);
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case 3: return Vector3i( 0, 0, 1);
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case 4: return Vector3i(-1, 0, 0);
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case 5: return Vector3i( 1, 0, 0);
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default:
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{
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LOGWARNING("%s: invalid direction %d, ignoring", __FUNCTION__, a_PistonMeta & 0x07);
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ASSERT(!"Invalid direction");
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return Vector3i();
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}
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}
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}
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void cBlockPistonHandler::ExtendPiston(Vector3i a_BlockPos, cWorld & a_World)
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{
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{
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// Broadcast block action first. Will do nothing if piston cannot in fact push
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BLOCKTYPE pistonBlock;
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NIBBLETYPE pistonMeta;
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a_World.GetBlockTypeMeta(a_BlockPos.x, a_BlockPos.y, a_BlockPos.z, pistonBlock, pistonMeta);
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a_World.BroadcastBlockAction(a_BlockPos, PistonExtendAction, pistonMeta, pistonBlock);
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}
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// Client expects the server to "play" the animation before setting the final blocks
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// However, we don't confuse animation with the underlying state of the world, so emulate by delaying 1 tick
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// (Probably why vanilla has so many dupe glitches with sand and pistons lolol)
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a_World.ScheduleTask(1, [a_BlockPos](cWorld & World)
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{
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BLOCKTYPE pistonBlock;
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NIBBLETYPE pistonMeta;
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World.GetBlockTypeMeta(a_BlockPos.x, a_BlockPos.y, a_BlockPos.z, pistonBlock, pistonMeta);
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if ((pistonBlock != E_BLOCK_PISTON) && !IsSticky(pistonBlock))
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{
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// Ensure we operate on a piston to avoid spurious behaviour
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// Note that the scheduled task may result in the block type of a_BlockPos changing
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return;
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}
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if (IsExtended(pistonMeta))
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{
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// Already extended, bail out
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return;
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}
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Vector3i pushDir = MetadataToOffset(pistonMeta);
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Vector3iSet blocksPushed;
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if (!CanPushBlock(a_BlockPos + pushDir, World, true, blocksPushed, pushDir))
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{
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// Can't push anything, bail out
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return;
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}
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PushBlocks(blocksPushed, World, pushDir);
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// Set the extension and the piston base correctly
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Vector3i extensionPos = a_BlockPos + pushDir;
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World.SetBlock(a_BlockPos.x, a_BlockPos.y, a_BlockPos.z, pistonBlock, pistonMeta | 0x8);
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World.SetBlock(
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extensionPos.x, extensionPos.y, extensionPos.z,
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E_BLOCK_PISTON_EXTENSION, pistonMeta | (IsSticky(pistonBlock) ? 8 : 0)
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);
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// Play sound effect only if extended successfully
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World.BroadcastSoundEffect("block.piston.extend", a_BlockPos, 0.5f, 0.7f);
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}
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);
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}
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void cBlockPistonHandler::RetractPiston(Vector3i a_BlockPos, cWorld & a_World)
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{
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{
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BLOCKTYPE pistonBlock;
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NIBBLETYPE pistonMeta;
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a_World.GetBlockTypeMeta(a_BlockPos.x, a_BlockPos.y, a_BlockPos.z, pistonBlock, pistonMeta);
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a_World.BroadcastBlockAction(a_BlockPos, PistonRetractAction, pistonMeta, pistonBlock);
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}
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a_World.ScheduleTask(1, [a_BlockPos](cWorld & World)
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{
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BLOCKTYPE pistonBlock;
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NIBBLETYPE pistonMeta;
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World.GetBlockTypeMeta(a_BlockPos.x, a_BlockPos.y, a_BlockPos.z, pistonBlock, pistonMeta);
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if ((pistonBlock != E_BLOCK_PISTON) && !IsSticky(pistonBlock))
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{
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// Ensure we operate on a piston to avoid spurious behaviour
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// Note that the scheduled task may result in the block type of a_BlockPos changing
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return;
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}
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if (!IsExtended(pistonMeta))
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{
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// Already retracted, bail out
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return;
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}
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Vector3i pushDir = MetadataToOffset(pistonMeta);
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// Check the extension:
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Vector3i extensionPos = a_BlockPos + pushDir;
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if (World.GetBlock(extensionPos) != E_BLOCK_PISTON_EXTENSION)
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{
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LOGD("%s: Piston without an extension - still extending, or just in an invalid state?", __FUNCTION__);
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return;
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}
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// Remove extension, update base state:
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World.SetBlock(extensionPos, E_BLOCK_AIR, 0);
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World.SetBlock(a_BlockPos, pistonBlock, pistonMeta & ~(8));
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// (Retraction is always successful, but play in the task for consistency)
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World.BroadcastSoundEffect("block.piston.contract", a_BlockPos, 0.5f, 0.7f);
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if (!IsSticky(pistonBlock))
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{
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// No need for block pulling, bail out
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return;
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}
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// Get the block to pull
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Vector3i AdjustedPosition = a_BlockPos + pushDir * 2;
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// Try to "push" the pulling block in the opposite direction
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pushDir *= -1;
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Vector3iSet pushedBlocks;
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if (!CanPushBlock(AdjustedPosition, World, false, pushedBlocks, pushDir))
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{
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// Not pushable, bail out
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return;
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}
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PushBlocks(pushedBlocks, World, pushDir);
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}
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);
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}
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void cBlockPistonHandler::PushBlocks(
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const Vector3iSet & a_BlocksToPush,
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cWorld & a_World, const Vector3i & a_PushDir
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)
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{
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// Sort blocks to move the blocks first, which are farthest away from the piston
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// This prevents the overwriting of existing blocks
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std::vector<Vector3i> sortedBlocks(a_BlocksToPush.begin(), a_BlocksToPush.end());
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std::sort(sortedBlocks.begin(), sortedBlocks.end(), [a_PushDir](const Vector3i & a, const Vector3i & b)
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{
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return (a.Dot(a_PushDir) > b.Dot(a_PushDir));
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});
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// Move every block
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BLOCKTYPE moveBlock;
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NIBBLETYPE moveMeta;
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for (auto & moveBlockPos : sortedBlocks)
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{
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a_World.GetBlockTypeMeta(moveBlockPos.x, moveBlockPos.y, moveBlockPos.z, moveBlock, moveMeta);
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if (cBlockInfo::IsPistonBreakable(moveBlock))
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{
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// Block is breakable, drop it:
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a_World.DropBlockAsPickups(moveBlockPos, nullptr, nullptr);
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}
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else
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{
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// Not breakable, just move it
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a_World.SetBlock(moveBlockPos.x, moveBlockPos.y, moveBlockPos.z, E_BLOCK_AIR, 0);
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moveBlockPos += a_PushDir;
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a_World.SetBlock(moveBlockPos.x, moveBlockPos.y, moveBlockPos.z, moveBlock, moveMeta);
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}
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}
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}
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bool cBlockPistonHandler::CanPushBlock(
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const Vector3i & a_BlockPos, cWorld & a_World, bool a_RequirePushable,
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Vector3iSet & a_BlocksPushed, const Vector3i & a_PushDir
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)
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{
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const static std::array<Vector3i, 6> pushingDirs =
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{
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{
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Vector3i(-1, 0, 0), Vector3i(1, 0, 0),
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Vector3i( 0, -1, 0), Vector3i(0, 1, 0),
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Vector3i( 0, 0, -1), Vector3i(0, 0, 1)
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}
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};
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BLOCKTYPE currBlock;
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NIBBLETYPE currMeta;
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a_World.GetBlockTypeMeta(a_BlockPos.x, a_BlockPos.y, a_BlockPos.z, currBlock, currMeta);
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if (!cChunkDef::IsValidHeight(a_BlockPos.y))
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{
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return !a_RequirePushable;
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}
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if (currBlock == E_BLOCK_AIR)
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{
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// Air can be pushed
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return true;
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}
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if (!a_RequirePushable && cBlockInfo::IsPistonBreakable(currBlock))
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{
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// Block should not be broken, when it's not in the pushing direction
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return true;
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}
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if (!CanPush(currBlock, currMeta))
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{
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// When it's not required to push this block, don't fail
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return !a_RequirePushable;
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}
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if (a_BlocksPushed.size() >= PISTON_MAX_PUSH_DISTANCE)
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{
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// Do not allow to push too much blocks
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return false;
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}
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if (!a_BlocksPushed.insert(a_BlockPos).second || cBlockInfo::IsPistonBreakable(currBlock))
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{
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return true; // Element exist already
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}
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if (currBlock == E_BLOCK_SLIME_BLOCK)
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{
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// Try to push the other directions
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for (const auto & testDir : pushingDirs)
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{
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if (!CanPushBlock(a_BlockPos + testDir, a_World, false, a_BlocksPushed, a_PushDir))
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{
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// When it's not possible for a direction, then fail
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return false;
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}
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}
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}
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// Try to push the block in front of this block
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return CanPushBlock(a_BlockPos + a_PushDir, a_World, true, a_BlocksPushed, a_PushDir);
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}
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void cBlockPistonHandler::OnBroken(
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cChunkInterface & a_ChunkInterface, cWorldInterface & a_WorldInterface,
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Vector3i a_BlockPos,
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BLOCKTYPE a_OldBlockType, NIBBLETYPE a_OldBlockMeta
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) const
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{
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if (!IsExtended(a_OldBlockMeta))
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{
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return;
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}
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const auto Extension = a_BlockPos + MetadataToOffset(a_OldBlockMeta);
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if (
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cChunkDef::IsValidHeight(Extension.y) &&
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(a_ChunkInterface.GetBlock(Extension) == E_BLOCK_PISTON_EXTENSION)
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)
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{
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// If the piston is extended, destroy the extension as well:
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a_ChunkInterface.SetBlock(Extension, E_BLOCK_AIR, 0);
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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// cBlockPistonHeadHandler:
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void cBlockPistonHeadHandler::OnBroken(
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cChunkInterface & a_ChunkInterface, cWorldInterface & a_WorldInterface,
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Vector3i a_BlockPos,
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BLOCKTYPE a_OldBlockType, NIBBLETYPE a_OldBlockMeta
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) const
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{
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const auto Base = a_BlockPos - cBlockPistonHandler::MetadataToOffset(a_OldBlockMeta);
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if (!cChunkDef::IsValidHeight(Base.y))
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{
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return;
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}
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const auto Block = a_ChunkInterface.GetBlock(Base);
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if ((Block == E_BLOCK_PISTON) || (Block == E_BLOCK_STICKY_PISTON))
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{
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// Remove the base of the piston:
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a_ChunkInterface.SetBlock(Base, E_BLOCK_AIR, 0);
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}
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}
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cItems cBlockPistonHeadHandler::ConvertToPickups(NIBBLETYPE a_BlockMeta, cBlockEntity * a_BlockEntity, const cEntity * a_Digger, const cItem * a_Tool) const
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{
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// Give a normal\sticky piston base, not piston extension
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// With 1.7, the item forms of these technical blocks have been removed, so giving someone this will crash their client...
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return { cItem(((a_BlockMeta & 0x8) == 0x8) ? E_BLOCK_STICKY_PISTON : E_BLOCK_PISTON) };
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}
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