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