bool cPiston::CanPull(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
{
switch (a_BlockType)
{
case E_BLOCK_LAVA:
case E_BLOCK_STATIONARY_LAVA:
case E_BLOCK_STATIONARY_WATER:
case E_BLOCK_WATER:
{
return false;
}
}
if (CanBreakPush(a_BlockType, a_BlockMeta))
{
return false; // CanBreakPush returns true, but we need false to prevent pulling
}
return CanPush(a_BlockType, a_BlockMeta);
}
int cBlockPistonHandler::FirstPassthroughBlock(int a_PistonX, int a_PistonY, int a_PistonZ, NIBBLETYPE pistonmeta, cWorld * a_World)
{
// Examine each of the 12 blocks ahead of the piston:
for (int ret = 0; ret < PISTON_MAX_PUSH_DISTANCE; ret++)
{
BLOCKTYPE currBlock;
NIBBLETYPE currMeta;
AddPistonDir(a_PistonX, a_PistonY, a_PistonZ, pistonmeta, 1);
a_World->GetBlockTypeMeta(a_PistonX, a_PistonY, a_PistonZ, currBlock, currMeta);
if (cBlockInfo::IsPistonBreakable(currBlock))
{
// This block breaks when pushed, extend up to here
return ret;
}
if (!CanPush(currBlock, currMeta))
{
// This block cannot be pushed at all, the piston can't extend
return -1;
}
}
// There is no space for the blocks to move, piston can't extend
return -1;
}
int cPiston::FirstPassthroughBlock(int pistonX, int pistonY, int pistonZ, NIBBLETYPE pistonmeta)
{
// Examine each of the 12 blocks ahead of the piston:
for (int ret = 0; ret < 12; ret++)
{
BLOCKTYPE currBlock;
NIBBLETYPE currMeta;
AddDir(pistonX, pistonY, pistonZ, pistonmeta, 1);
m_World->GetBlockTypeMeta(pistonX, pistonY, pistonZ, currBlock, currMeta);
if (CanBreakPush(currBlock, currMeta))
{
// This block breaks when pushed, extend up to here
return ret;
}
if (!CanPush(currBlock, currMeta))
{
// This block cannot be pushed at all, the piston can't extend
return -1;
}
}
// There is no space for the blocks to move, piston can't extend
return -1;
}
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 (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);
}
