flewkey/cuberite-2a
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Made cPiston code more readable and configurable.

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Fixed some minor problems with pistons, such as pulling water etc. Thanks to TigerW for some inspiration.
This commit is contained in:
madmaxoft 2013-08-18 14:28:52 +02:00
parent 0d323563e4
commit a46977f56e
2 changed files with 200 additions and 78 deletions
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252
source/Piston.cpp
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@ -20,21 +20,6 @@ extern bool g_BlockPistonBreakable[];
//Replace AddDir (...) with the switch cases that, sets coords in direction of piston face
#define AddDir( x, y, z, dir, amount ) \
switch (dir) \
{ \
case 0: (y)-=(amount); break; \
case 1: (y)+=(amount); break; \
case 2: (z)-=(amount); break; \
case 3: (z)+=(amount); break; \
case 4: (x)-=(amount); break; \
case 5: (x)+=(amount); break; \
}
cPiston::cPiston(cWorld * a_World)
: m_World(a_World)
@ -46,55 +31,55 @@ cPiston::cPiston(cWorld * a_World)
unsigned short cPiston::FirstPassthroughBlock(int pistonX, int pistonY, int pistonZ, char pistonmeta)
int cPiston::FirstPassthroughBlock(int pistonX, int pistonY, int pistonZ, NIBBLETYPE pistonmeta)
{
unsigned short ret;
pistonmeta &= 7;
if (pistonmeta >= 6)
// Examine each of the 12 blocks ahead of the piston:
for (int ret = 0; ret < 12; ret++)
{
// Just in case, it shouldn't happen but if it would, it'd cause inf loop
LOGD("cPiston::FirstPassthroughBlock - piston has invalid meta data!\n");
return 9001;
}
BLOCKTYPE currBlock;
NIBBLETYPE currMeta;
for (ret = 0; ret < 24; ret++) //Push up to 24 blocks
{
AddDir( pistonX, pistonY, pistonZ, pistonmeta, 1) //Set the coords one further from the piston direction
BLOCKTYPE currBlock;
NIBBLETYPE currMeta;
AddDir(pistonX, pistonY, pistonZ, pistonmeta, 1);
m_World->GetBlockTypeMeta(pistonX, pistonY, pistonZ, currBlock, currMeta);
if ((currBlock == E_BLOCK_BEDROCK) || (currBlock == E_BLOCK_OBSIDIAN) || (currBlock == E_BLOCK_PISTON_EXTENSION) || ( (currMeta & 0x8) != 0x0 ))
{
return 9001;
}
if (g_BlockPistonBreakable[currBlock]) //If it's a breakable block (air, torch, etc.) then the line of blocks can be pushed
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;
}
}
return 9001; //There is no space for the blocks to move within 24 spaces, piston can't push
// There is no space for the blocks to move, piston can't extend
return -1;
}
void cPiston::ExtendPiston( int pistx, int pisty, int pistz )
void cPiston::ExtendPiston(int pistx, int pisty, int pistz)
{
BLOCKTYPE pistonBlock;
NIBBLETYPE pistonMeta;
m_World->GetBlockTypeMeta(pistx, pisty, pistz, pistonBlock, pistonMeta);
char isSticky = (char)(pistonBlock == E_BLOCK_STICKY_PISTON) * 8;
if ( (pistonMeta & 0x8) != 0x0 )
if (IsExtended(pistonMeta))
{
// Piston already extended, bail out
// Already extended, bail out
return;
}
unsigned short dist = FirstPassthroughBlock(pistx, pisty, pistz, pistonMeta);
if (dist > 9000) return; // FirstPassthroughBlock says piston can't push anything, bail out
int dist = FirstPassthroughBlock(pistx, pisty, pistz, pistonMeta);
if (dist < 0)
{
// FirstPassthroughBlock says piston can't push anything, bail out
return;
}
AddDir(pistx, pisty, pistz, pistonMeta & 7, dist + 1) //Get the coords of the air / breakable block in the line, dist+1 because of coords
// Drop the breakable block in the line, if appropriate:
AddDir(pistx, pisty, pistz, pistonMeta, dist + 1); // "pist" now at the breakable / empty block
BLOCKTYPE currBlock;
NIBBLETYPE currMeta;
m_World->GetBlockTypeMeta(pistx, pisty, pistz, currBlock, currMeta);
@ -106,30 +91,30 @@ void cPiston::ExtendPiston( int pistx, int pisty, int pistz )
Handler->DropBlock(m_World, NULL, pistx, pisty, pistz); //If block is breakable, drop it
}
}
int oldx = pistx, oldy = pisty, oldz = pistz; //Make a second set of coord vars along with the originals
// Push blocks, from the furthest to the nearest:
int oldx = pistx, oldy = pisty, oldz = pistz;
NIBBLETYPE currBlockMeta;
if (dist != 0) //Check for single block being pushed - for loop doesn't catch it in time and breaks stuffz
for (int i = dist + 1; i > 1; i--)
{
for (int i = dist + 1; i > 1; i--) //Decrement from the dropped breakable block to two further than the piston (one further will be future extension)
{
AddDir(pistx, pisty, pistz, pistonMeta & 7, -1) //Move one set of coords one back from breakable dropped block
m_World->GetBlockTypeMeta(pistx, pisty, pistz, currBlock, currBlockMeta); //Get the block
m_World->SetBlock( oldx, oldy, oldz, currBlock, currBlockMeta); //Set the block at the location of the original coords
oldx = pistx; //Shift the selectors down a block and repeat
oldy = pisty;
oldz = pistz;
}
AddDir(pistx, pisty, pistz, pistonMeta, -1);
m_World->GetBlockTypeMeta(pistx, pisty, pistz, currBlock, currBlockMeta);
m_World->SetBlock( oldx, oldy, oldz, currBlock, currBlockMeta);
oldx = pistx;
oldy = pisty;
oldz = pistz;
}
int extx = pistx;
int exty = pisty;
int extz = pistz;
AddDir(pistx, pisty, pistz, pistonMeta & 7, -1) //Move back one block to the piston base
m_World->BroadcastBlockAction(pistx, pisty, pistz, 0, pistonMeta, E_BLOCK_PISTON); //Set the base
AddDir(pistx, pisty, pistz, pistonMeta, -1);
// "pist" now at piston body, "ext" at future extension
m_World->BroadcastBlockAction(pistx, pisty, pistz, 0, pistonMeta, pistonBlock);
m_World->BroadcastSoundEffect("tile.piston.out", pistx * 8, pisty * 8, pistz * 8, 0.5f, 0.7f);
m_World->FastSetBlock( pistx, pisty, pistz, pistonBlock, pistonMeta | 0x8 );
m_World->SetBlock(extx, exty, extz, E_BLOCK_PISTON_EXTENSION, isSticky + pistonMeta); //Set the arm
m_World->FastSetBlock(pistx, pisty, pistz, pistonBlock, pistonMeta | 0x8);
m_World->SetBlock(extx, exty, extz, E_BLOCK_PISTON_EXTENSION, pistonMeta | (IsSticky(pistonBlock) ? 8 : 0));
}
@ -141,47 +126,44 @@ void cPiston::RetractPiston( int pistx, int pisty, int pistz )
BLOCKTYPE pistonBlock;
NIBBLETYPE pistonMeta;
m_World->GetBlockTypeMeta(pistx, pisty, pistz, pistonBlock, pistonMeta);
if (pistonMeta <= 6)
if (!IsExtended(pistonMeta))
{
// Already retracted, bail out
return;
}
m_World->BroadcastBlockAction(pistx, pisty, pistz, 1, pistonMeta & ~(8), E_BLOCK_PISTON);
m_World->BroadcastSoundEffect("tile.piston.in", pistx * 8, pisty * 8, pistz * 8, 0.5f, 0.7f);
m_World->FastSetBlock(pistx, pisty, pistz, pistonBlock, pistonMeta & ~(8)); //Set the base
AddDir(pistx, pisty, pistz, pistonMeta & 7, 1) //Move forwards to the extension coord
// Check the extension:
AddDir(pistx, pisty, pistz, pistonMeta, 1);
if (m_World->GetBlock(pistx, pisty, pistz) != E_BLOCK_PISTON_EXTENSION)
{
LOGD("%s: Piston without an extension?", __FUNCTION__);
return;
}
if (pistonBlock == E_BLOCK_STICKY_PISTON)
// Retract the extension, pull block if appropriate
if (IsSticky(pistonBlock))
{
int tempx = pistx, tempy = pisty, tempz = pistz;
AddDir( tempx, tempy, tempz, pistonMeta & 7, 1 ) //Move forward to the block being pulled
BLOCKTYPE tempblock;
NIBBLETYPE tempmeta;
m_World->GetBlockTypeMeta(tempx, tempy, tempz, tempblock, tempmeta); //Check for pullable-ness
if (
(tempblock == E_BLOCK_OBSIDIAN) ||
(tempblock == E_BLOCK_BEDROCK) ||
(tempblock == E_BLOCK_PISTON_EXTENSION) ||
(g_BlockPistonBreakable[tempblock]) ||
((tempmeta & 0x8) != 0x0 )
)
AddDir( tempx, tempy, tempz, pistonMeta, 1);
BLOCKTYPE tempBlock;
NIBBLETYPE tempMeta;
m_World->GetBlockTypeMeta(tempx, tempy, tempz, tempBlock, tempMeta);
if (CanPull(tempBlock, tempMeta))
{
// These cannot be moved by the sticky piston, bail out
return;
m_World->SetBlock(pistx, pisty, pistz, tempBlock, tempMeta);
m_World->SetBlock(tempx, tempy, tempz, E_BLOCK_AIR, 0);
}
else
{
m_World->SetBlock(pistx, pisty, pistz, E_BLOCK_AIR, 0);
}
m_World->SetBlock(pistx, pisty, pistz, tempblock, tempmeta);
m_World->SetBlock(tempx, tempy, tempz, E_BLOCK_AIR, 0);
}
else
{
m_World->SetBlock(pistx, pisty, pistz, E_BLOCK_AIR, 0);
}
}
@ -189,3 +171,119 @@ void cPiston::RetractPiston( int pistx, int pisty, int pistz )
bool cPiston::IsExtended(NIBBLETYPE a_PistonMeta)
{
return ((a_PistonMeta & 0x8) != 0x0);
}
bool cPiston::IsSticky(BLOCKTYPE a_BlockType)
{
return (a_BlockType == E_BLOCK_STICKY_PISTON);
}
bool cPiston::IsStickyExtension(NIBBLETYPE a_ExtMeta)
{
return ((a_ExtMeta & 0x08) != 0);
}
bool cPiston::CanPush(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
{
switch (a_BlockType)
{
case E_BLOCK_ANVIL:
case E_BLOCK_BED:
case E_BLOCK_BEDROCK:
case E_BLOCK_BREWING_STAND:
case E_BLOCK_CHEST:
case E_BLOCK_COMMAND_BLOCK:
case E_BLOCK_DISPENSER:
case E_BLOCK_DROPPER:
case E_BLOCK_ENCHANTMENT_TABLE:
case E_BLOCK_END_PORTAL:
case E_BLOCK_END_PORTAL_FRAME:
case E_BLOCK_FURNACE:
case E_BLOCK_HOPPER:
case E_BLOCK_JUKEBOX:
case E_BLOCK_MOB_SPAWNER:
case E_BLOCK_NETHER_PORTAL:
case E_BLOCK_NOTE_BLOCK:
case E_BLOCK_OBSIDIAN:
case E_BLOCK_PISTON_EXTENSION:
{
return false;
}
case E_BLOCK_PISTON:
{
// A piston can only be pushed if retracted:
return !IsExtended(a_BlockMeta);
}
}
return true;
}
bool cPiston::CanBreakPush(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
{
return g_BlockPistonBreakable[a_BlockType];
}
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;
}
}
return CanPush(a_BlockType, a_BlockMeta) || CanBreakPush(a_BlockType, a_BlockMeta);
}
void cPiston::AddDir(int & a_BlockX, int & a_BlockY, int & a_BlockZ, NIBBLETYPE a_PistonMeta, int a_Amount)
{
switch (a_PistonMeta & 0x07)
{
case 0: a_BlockY -= a_Amount; break;
case 1: a_BlockY += a_Amount; break;
case 2: a_BlockZ -= a_Amount; break;
case 3: a_BlockZ += a_Amount; break;
case 4: a_BlockX -= a_Amount; break;
case 5: a_BlockX += a_Amount; break;
default:
{
LOGWARNING("%s: invalid direction %d, ignoring", __FUNCTION__, a_PistonMeta & 0x07);
break;
}
}
}

26
source/Piston.h
View File

@ -57,12 +57,36 @@ public:
void ExtendPiston( int, int, int );
void RetractPiston( int, int, int );
/// Returns true if the piston (specified by blocktype) is a sticky piston
static bool IsSticky(BLOCKTYPE a_BlockType);
/// Returns true if the piston (with the specified meta) is extended
static bool IsExtended(NIBBLETYPE a_PistonMeta);
/// Returns true if the extension (with the specified meta) is sticky
static bool IsStickyExtension(NIBBLETYPE a_ExtMeta);
/// Returns true if the specified block can be pushed by a piston (and left intact)
static bool CanPush(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
/// Returns true if the specified block can be pushed by a piston and broken / replaced
static bool CanBreakPush(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
/// Returns true if the specified block can be pulled by a sticky piston
static bool CanPull(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
/// Updates the coords by the specified amount in the direction a piston of the specified meta is facing
static void AddDir(int & a_BlockX, int & a_BlockY, int & a_BlockZ, NIBBLETYPE a_PistonMeta, int a_Amount);
cWorld * m_World;
private:
void ChainMove( int, int, int, char, unsigned short * );
unsigned short FirstPassthroughBlock( int, int, int, char );
/// Returns how many blocks the piston has to push (where the first free space is); <0 when unpushable
int FirstPassthroughBlock(int a_PistonX, int a_PistonY, int a_PistonZ, NIBBLETYPE a_PistonMeta);
} ;