C++ GetChunk函数代码示例

Sound::Sound(const std::wstring& waveResourceName, bool loopForever, bool hasReverb) :
	m_SoundCallbacks(this),
	m_SubmixVoice(nullptr)
{
	auto waveFile = RiffFile::Create(waveResourceName);
	Assert(waveFile.GetFormat() == RiffFourCC::WAVE);

	ZeroMemory(&m_WaveFormat, sizeof(m_WaveFormat));
	ZeroMemory(&m_AudioBuffer, sizeof(m_AudioBuffer));

	const auto& formatChunk = waveFile.GetChunk(RiffFourCC::FMT);
	Assert(sizeof(m_WaveFormat) >= formatChunk.GetSize());
	memcpy(&m_WaveFormat, formatChunk.GetData(), formatChunk.GetSize());

	auto& dataChunk = waveFile.GetChunk(RiffFourCC::DATA);
	m_SoundDataBuffer = std::move(dataChunk.GetDataBuffer());

	m_AudioBuffer.AudioBytes = dataChunk.GetSize();
	m_AudioBuffer.pAudioData = m_SoundDataBuffer.get();
	m_AudioBuffer.Flags = XAUDIO2_END_OF_STREAM;
	m_AudioBuffer.LoopCount = loopForever ? XAUDIO2_LOOP_INFINITE : 0;

	if (hasReverb)
	{
		m_SubmixVoice = AudioManager::GetInstance().CreateSubmixVoice(m_WaveFormat);
	}
}

		void GLMapRenderer::DrawColumnDLight(int cx, int cy, int cz, spades::Vector3 eye, const std::vector<GLDynamicLight>& lights){
			cx &= numChunkWidth -1;
			cy &= numChunkHeight - 1;
			for(int z = std::max(cz, 0); z < numChunkDepth; z++)
				GetChunk(cx, cy, z)->RenderDLightPass(lights);
			for(int z = std::min(cz - 1, 63); z >= 0; z--)
				GetChunk(cx, cy, z)->RenderDLightPass(lights);
		}

// return false if _takeIdx not found (e.g. empty *item*)
bool SNM_TakeParserPatcher::GetTakeChunkPos(int _takeIdx, int* _pos, int* _len)
{
	int tkCount = 0;
	const char* p = strstr(GetChunk()->Get(), "\nTAKE"); // force GetChunk() (+ add fake 1st take if needed)
	while (p)
	{
		if (IsValidTakeChunkLine(p))
		{
			if (tkCount == _takeIdx)
			{
				// is there a next take ?
				const char* p2 = strstr(p+1, "\nTAKE");
				while (p2) 
				{
					if (IsValidTakeChunkLine(p2)) break;
					p2 = strstr(p2+1, "\nTAKE");
				}

				*_pos = (int)(p+1 - m_chunk->Get()); 
				if (_len)
				{
					if (p2 && !strncmp(p2, "\nTAKE", 5)) *_len = (int)(p2-p);
					// it's the last take
					else  *_len = strlen(p+1)-2; // -2 for final ">\n"
				}
				return true;
			}
			tkCount++;
		}
		p = strstr(p+1, "\nTAKE");
	}
	return false;
}

void OnSetChunkNeighborhood(Packet& packet) {
	u16 chunkID, neighborhoodID;
	packet.Read(chunkID);
	packet.Read(neighborhoodID);

	auto chmgr = ChunkManager::Get();
	auto ch = chmgr->GetChunk(chunkID);
	if(!ch) {
		logger << "Server tried to set neighborhood of unknown chunk!";
		return;
	}

	auto neigh = chmgr->GetNeighborhood(neighborhoodID);
	if(!neigh) {
		neigh = chmgr->CreateNeighborhood();
		neigh->neighborhoodID = neighborhoodID;
		neigh->chunkSize = ivec3{ch->width, ch->height, ch->depth};
	}

	ch->SetNeighborhood(neigh);
	packet.Read<ivec3>(ch->positionInNeighborhood);

	logger << ch->positionInNeighborhood;
	neigh->UpdateChunkTransform(ch);
}

void OnSetBlock(Packet& packet) {
	auto chmgr = ChunkManager::Get();
	u8 orientation;
	u16 chunkID, blockType;
	ivec3 vxPos;

	// Assume vxPos is in bounds
	packet.Read(chunkID);
	packet.Read<ivec3>(vxPos);
	packet.Read(blockType);

	orientation = blockType & 3;
	blockType >>= 2;

	auto ch = chmgr->GetChunk(chunkID);
	if(!ch) {
		logger << "Missing chunkID " << chunkID;
		return;
	}

	if(blockType) {
		auto blk = ch->CreateBlock(vxPos, blockType);
		if(blk) blk->orientation = orientation;
		else logger << "Block create failed at " << vxPos;
	}else{
		ch->DestroyBlock(vxPos);
	}
}

static int DoNextChunk( T3dsLoaderPers *pers, int endofs ){
	T3dsChunk *chunk;

#ifdef DEBUG_PM_3DS
	printf( "DoNextChunk: endofs %d\n",endofs );
#endif
	while ( pers->cofs < endofs )
	{
		long nextofs = pers->cofs;
		if ( ( chunk = GetChunk( pers ) ) == NULL ) {
			return 0;
		}
		if ( !chunk->len ) {
			return 0;
		}
		nextofs += chunk->len;

#ifdef DEBUG_PM_3DS_EX
		printf( "Chunk %04x (%s), len %d pers->cofs %x\n",chunk->id,DebugGetChunkName( chunk->id ),chunk->len,pers->cofs );
#endif
		/*** version ***/
		if ( chunk->id == CHUNK_VERSION ) {
			/* at this point i get the 3ds file version. since there */
			/* might be new additions to the 3ds file format in 4.0 */
			/* it might be a good idea to store the version somewhere */
			/* for later handling or message displaying */

			/* get the version */
			int version;
			version = GetWord( pers );
			GetWord( pers );
#ifdef DEBUG_PM_3DS
			printf( "FileVersion: %d\n",version );
#endif

			/* throw out a warning for version 4 models */
			if ( version == 4 ) {
				_pico_printf( PICO_WARNING,
							  "3DS version is 4. Model might load incorrectly." );
			}
			/* store the 3ds file version in pico special field 0 */
			/* PicoSetSurfaceSpecial(pers->surface,0,version); */		/* ydnar: this was causing a crash accessing uninitialized surface */

			/* rest of chunk is skipped here */
		}
		/*** editor data ***/
		if ( chunk->id == CHUNK_EDITOR_DATA ) {
			if ( !DoNextEditorDataChunk( pers,nextofs ) ) {
				return 0;
			}
			continue;
		}
		/* skip unknown chunk */
		pers->cofs = nextofs;
		if ( pers->cofs >= pers->maxofs ) {
			break;
		}
	}
	return 1;
}

		void GLRadiosityRenderer::UpdateChunk(int cx, int cy, int cz) {
			Chunk &c = GetChunk(cx, cy, cz);
			if (!c.dirty)
				return;

			int originX = cx * ChunkSize;
			int originY = cy * ChunkSize;
			int originZ = cz * ChunkSize;

			for (int z = c.dirtyMinZ; z <= c.dirtyMaxZ; z++)
				for (int y = c.dirtyMinY; y <= c.dirtyMaxY; y++)
					for (int x = c.dirtyMinX; x <= c.dirtyMaxX; x++) {
						IntVector3 pos;
						pos.x = (x + originX);
						pos.y = (y + originY);
						pos.z = (z + originZ);

						Result res = Evaluate(pos);
						c.dataFlat[z][y][x] = EncodeValue(res.base);
						c.dataX[z][y][x] = EncodeValue(res.x);
						c.dataY[z][y][x] = EncodeValue(res.y);
						c.dataZ[z][y][x] = EncodeValue(res.z);
					}

			c.dirty = false;
			c.transferDone = false;
		}

// assumes _chunk always begins with "TAKE"
// _pos: start pos of the take if known, for optimization (-1 if unknown)
// returns the end position after insertion (or -1 if failed)
int SNM_TakeParserPatcher::InsertTake(int _takeIdx, WDL_FastString* _chunk, int _pos)
{
	int afterPos = -1;
	int length = _chunk ? _chunk->GetLength() : 0;
	if (length && GetChunk()) // force GetChunk() (force cache + add fake 1st take if needed)
	{
		// last pos?
		if (_takeIdx >= CountTakesInChunk())
		{
			afterPos = AddLastTake(_chunk);
		}
		// other pos
		else 
		{
			int pos = _pos;
			if (pos < 0)
				GetTakeChunkPos(_takeIdx, &pos);

			if (pos >= 0)
			{
				m_chunk->Insert(_chunk->Get(), pos);
				afterPos = pos + length;
				m_currentTakeCount++; // *always* reflect the nb of takes in the *chunk*
				m_updates++; // as we're directly working on the cached chunk..
			}
		}
	}
	return afterPos;
}

const unsigned char C_Game::GetCubeType(const int h, const int i, const int j)
{
    int diffX = 0;
    int diffY = 0;
    if(h < 0) diffX = 1;
    if(i < 0) diffY = 1;

    int a = (h+diffX)/CHUNK_SIZE;
    if(h < 0)
        a--;
    int b = (i+diffY)/CHUNK_SIZE;
    if(i < 0)
        b--;

    MinecraftChunk *ch = GetChunk(a, b);

    int xx = h + diffX - (int)((h+diffX)/CHUNK_SIZE) * CHUNK_SIZE;
    if(h < 0)
    {
        if(xx <= 0)
                xx = CHUNK_SIZE - 1 + xx;
    }

    int yy = i + diffY - (int)((i+diffY)/CHUNK_SIZE) * CHUNK_SIZE;
    if(i < 0)
    {
        if(yy <= 0)
                yy = CHUNK_SIZE - 1 + yy;
    }

    return ch->_chunkMap[xx][yy][j];
}

void C_Game::CreateRandomChunk(const int a, const int b)
{
    if(GetChunk(a, b) != NULL)
        return;

    MinecraftChunk *temp = new MinecraftChunk;
    temp->x = a;
    temp->y = b;
    temp->_hidden = true;
    _chunks.push_back(temp);

    for(int h=0;h<CHUNK_SIZE;h++)
    {
        for(int i=0;i<CHUNK_SIZE;i++)
        {
            for(int j=0;j<CHUNK_ZVALUE;j++)
            {
                _chunks.back()->_chunkMap[h][i][j] = (rand() % (NB_TYPE_CUBE-1)) +1;
            }
        }
    }
    for(int h=0;h<CHUNK_SIZE;h++)
        for(int i=0;i<CHUNK_SIZE;i++)
            for(int j=CHUNK_ZVALUE/2;j<CHUNK_ZVALUE;j++)
                _chunks.back()->_chunkMap[h][i][j] = CUBE_AIR;
}

void HierarchicalPathfinder::FindNearestNavcellInRegions(const std::set<RegionID>& regions, u16& iGoal, u16& jGoal, pass_class_t passClass)
{
	// Find the navcell in the given regions that's nearest to the goal navcell:
	// * For each region, record the (squared) minimal distance to the goal point
	// * Sort regions by that underestimated distance
	// * For each region, find the actual nearest navcell
	// * Stop when the underestimated distances are worse than the best real distance

	std::vector<std::pair<u32, RegionID> > regionDistEsts; // pair of (distance^2, region)

	for (const RegionID& region : regions)
	{
		int i0 = region.ci * CHUNK_SIZE;
		int j0 = region.cj * CHUNK_SIZE;
		int i1 = i0 + CHUNK_SIZE - 1;
		int j1 = j0 + CHUNK_SIZE - 1;

		// Pick the point in the chunk nearest the goal
		int iNear = Clamp((int)iGoal, i0, i1);
		int jNear = Clamp((int)jGoal, j0, j1);

		int dist2 = (iNear - iGoal)*(iNear - iGoal)
		          + (jNear - jGoal)*(jNear - jGoal);

		regionDistEsts.emplace_back(dist2, region);
	}

	// Sort by increasing distance (tie-break on RegionID)
	std::sort(regionDistEsts.begin(), regionDistEsts.end());

	int iBest = iGoal;
	int jBest = jGoal;
	u32 dist2Best = std::numeric_limits<u32>::max();

	for (auto& pair : regionDistEsts)
	{
		if (pair.first >= dist2Best)
			break;

		RegionID region = pair.second;

		int i, j;
		u32 dist2;
		GetChunk(region.ci, region.cj, passClass).RegionNavcellNearest(region.r, iGoal, jGoal, i, j, dist2);

		if (dist2 < dist2Best)
		{
			iBest = i;
			jBest = j;
			dist2Best = dist2;
		}
	}

	iGoal = iBest;
	jGoal = jBest;
}

// assumes _newTakeChunk always begins with "TAKE"
bool SNM_TakeParserPatcher::ReplaceTake(int _startTakePos, int _takeLength, WDL_FastString* _newTakeChunk)
{
	bool updated = false;
	if (GetChunk() && _newTakeChunk && _startTakePos >= 0) // force GetChunk() (force cache + add fake 1st take if needed)
	{
		int prevLgth = GetChunk()->GetLength();
		GetChunk()->DeleteSub(_startTakePos, _takeLength);
		m_updates++; // as we're directly working on the cached chunk..
		updated = true;
		m_currentTakeCount--;
		if (prevLgth > GetChunk()->GetLength()) // see WDL_FastString.DeleteSub()
		{
			GetChunk()->Insert(_newTakeChunk->Get(), _startTakePos, _newTakeChunk->GetLength());
			m_updates++; 
			m_currentTakeCount++;
		}
	}
	return updated;
}

	WavAudioStream::WavAudioStream(IStream *s, bool ac) {
		SPADES_MARK_FUNCTION();
		
		stream = s;
		autoClose = ac;
		
		// skip header
		s->SetPosition(12 + s->GetPosition());
		while(s->GetPosition() < s->GetLength()) {
			RiffChunkInfo info = ReadChunkInfo();
			chunks[info.name] = info;
			s->SetPosition(info.dataPosition + info.length);
		}
		
		const RiffChunkInfo& fmt = GetChunk("fmt ");
		
		stream->SetPosition(fmt.dataPosition);
		stream->ReadLittleShort();// ??
		channels = stream->ReadLittleShort();
		rate = stream->ReadLittleInt();
		stream->ReadLittleInt();
		stream->ReadLittleShort();
		int bits = stream->ReadLittleShort();
		switch(bits){
			case 8:
				sampleFormat = UnsignedByte;
				break;
			case 16:
				sampleFormat = SignedShort;
				break;
			case 32:
				sampleFormat = SingleFloat;
				break;
			default:
				SPRaise("Unsupported bit count: %d", bits);
		}
		
		dataChunk = &GetChunk("data");
		stream->SetPosition(dataChunk->dataPosition);
		
		startPos = dataChunk->dataPosition;
		endPos = dataChunk->dataPosition + dataChunk->length;
	}

bool BabelGlue::GetPos(GPXCoord *pos)
{
	const char *file;
	unsigned long fs;
	int num;
	long crc;
	kGUIString created;
	kGUIString coords;
	kGUIStringSplit ss;
	bool gotnew=false;

	crc=kGUI::FileCRC("gpsbabel.kml");
	file=(const char *)kGUI::LoadFile("gpsbabel.kml",&fs);
	if(file)
	{
		/* get created string */
		if(GetChunk("<Snippet>",file,&created))
		{
			/* get coords */
			if(GetChunk("<coordinates>",file,&coords))
			{
				/* created only has 1 second resolution so we use crc too */
				if(strcmp(created.GetString(),m_created.GetString()) || m_crc!=crc)
				{
					num=ss.Split(&coords,",");
					if((num==2) || (num==3))
					{
						/* lon/lat/alt */
						m_created.SetString(&created);
						m_crc=crc;
						m_lat=ss.GetWord(1)->GetDouble();
						m_lon=ss.GetWord(0)->GetDouble();
						pos->Set(m_lat,m_lon);
						gotnew=true;
					}
				}
			}
		}
		delete []file;
	}
	return(gotnew);
}

bool World::UnloadChunk(Chunk::ChunkPosition chunkPosition) {
	Chunk* pChunk = GetChunk(chunkPosition.x, chunkPosition.y, chunkPosition.z);
	if(pChunk == nullptr) return false;
	m_vpChunks.erase(std::remove(m_vpChunks.begin(), m_vpChunks.end(), pChunk), m_vpChunks.end());
	m_vpChunksToGenerate.erase(std::remove(m_vpChunksToGenerate.begin(), m_vpChunksToGenerate.end(), pChunk), m_vpChunksToGenerate.end());
	m_vpChunksToMesh.erase(std::remove(m_vpChunksToMesh.begin(), m_vpChunksToMesh.end(), pChunk), m_vpChunksToMesh.end());
	m_vpChunksToRender.erase(std::remove(m_vpChunksToRender.begin(), m_vpChunksToRender.end(), pChunk), m_vpChunksToRender.end());
	delete pChunk;
	pChunk = nullptr;
	return true;
}