axmol/cocos2dx/tileMap_parallax_nodes/CCTMXLayer.cpp

/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

http://www.cocos2d-x.org

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****************************************************************************/
#include "CCTMXLayer.h"
#include "CCTMXXMLParser.h"
#include "CCTMXTiledMap.h"
#include "CCSprite.h"
#include "CCTextureCache.h"
#include "CGPointExtension.h"
#include "support/data_support/ccCArray.h"

namespace cocos2d {


	// CCTMXLayer - init & alloc & dealloc
	CCTMXLayer * CCTMXLayer::layerWithTilesetInfo(CCTMXTilesetInfo *tilesetInfo, CCTMXLayerInfo *layerInfo, CCTMXMapInfo *mapInfo)
	{
		CCTMXLayer *pRet = new CCTMXLayer();
		if (pRet->initWithTilesetInfo(tilesetInfo, layerInfo, mapInfo))
		{
			pRet->autorelease();
			return pRet;
		}
		return NULL;
	}
	bool CCTMXLayer::initWithTilesetInfo(CCTMXTilesetInfo *tilesetInfo, CCTMXLayerInfo *layerInfo, CCTMXMapInfo *mapInfo)
	{	
		// XXX: is 35% a good estimate ?
		CGSize size = layerInfo->m_tLayerSize;
		float totalNumberOfTiles = size.width * size.height;
		float capacity = totalNumberOfTiles * 0.35f + 1; // 35 percent is occupied ?

		CCTexture2D *texture = NULL;
		if( tilesetInfo )
		{
			texture = CCTextureCache::sharedTextureCache()->addImage(tilesetInfo->m_sSourceImage.c_str());
		}

		if (CCSpriteBatchNode::initWithTexture(texture, (unsigned int)capacity))
		{
			// layerInfo
			m_sLayerName = layerInfo->m_sName;
			m_tLayerSize = layerInfo->m_tLayerSize;
			m_pTiles = layerInfo->m_pTiles;
			m_uMinGID = layerInfo->m_uMinGID;
			m_uMaxGID = layerInfo->m_uMaxGID;
			m_cOpacity = layerInfo->m_cOpacity;
			m_pProperties = CCXStringToStringDictionary::dictionaryWithDictionary(layerInfo->getProperties());

			// tilesetInfo
			m_pTileSet = tilesetInfo;
			CCX_SAFE_RETAIN(m_pTileSet);

			// mapInfo
			m_tMapTileSize = mapInfo->getTileSize();
			m_nLayerOrientation = mapInfo->getOrientation();

			// offset (after layer orientation is set);
			CGPoint offset = this->calculateLayerOffset(layerInfo->m_tOffset);
			this->setPositionInPixels(offset);

			m_pAtlasIndexArray = ccCArrayNew((unsigned int)totalNumberOfTiles);

			this->setContentSizeInPixels(CGSizeMake(m_tLayerSize.width * m_tMapTileSize.width, m_tLayerSize.height * m_tMapTileSize.height));

			m_bUseAutomaticVertexZ = false;
			m_nVertexZvalue = 0;
			m_fAlphaFuncValue = 0;
			return true;
		}
		return false;
	}
	CCTMXLayer::CCTMXLayer()
		:m_pTiles(NULL)
		,m_pTileSet(NULL)
		,m_pProperties(NULL)
		,m_pReusedTile(NULL)
		,m_pAtlasIndexArray(NULL)
		,m_tLayerSize(CGSizeZero)
		,m_tMapTileSize(CGSizeZero)
		,m_sLayerName("")
	{}
	CCTMXLayer::~CCTMXLayer()
	{
		CCX_SAFE_RELEASE(m_pTileSet);
		CCX_SAFE_RELEASE(m_pReusedTile);
		CCX_SAFE_RELEASE(m_pProperties);

		if( m_pAtlasIndexArray )
		{
			ccCArrayFree(m_pAtlasIndexArray);
			m_pAtlasIndexArray = NULL;
		}

		if( m_pTiles )
		{
			delete [] m_pTiles;
			m_pTiles = NULL;
		}
	}
	CCTMXTilesetInfo * CCTMXLayer::getTileSet()
	{
		return m_pTileSet;
	}
	void CCTMXLayer::setTileSet(CCTMXTilesetInfo* var)
	{
		CCX_SAFE_RETAIN(var);
		CCX_SAFE_RELEASE(m_pTileSet);
		m_pTileSet = var;
	}
	void CCTMXLayer::releaseMap()
	{
		if( m_pTiles )
		{
			delete [] m_pTiles;
			m_pTiles = NULL;
		}

		if( m_pAtlasIndexArray )
		{
			ccCArrayFree(m_pAtlasIndexArray);
			m_pAtlasIndexArray = NULL;
		}
	}

	// CCTMXLayer - setup Tiles
	void CCTMXLayer::setupTiles()
	{	
		// Optimization: quick hack that sets the image size on the tileset
		m_pTileSet->m_tImageSize = m_pobTextureAtlas->getTexture()->getContentSizeInPixels();

		// By default all the tiles are aliased
		// pros:
		//  - easier to render
		// cons:
		//  - difficult to scale / rotate / etc.
		m_pobTextureAtlas->getTexture()->setAliasTexParameters();

		//CFByteOrder o = CFByteOrderGetCurrent();

		// Parse cocos2d properties
		this->parseInternalProperties();

		for( unsigned int y=0; y < m_tLayerSize.height; y++ ) 
		{
			for( unsigned int x=0; x < m_tLayerSize.width; x++ ) 
			{
				unsigned int pos = (unsigned int)(x + m_tLayerSize.width * y);
				unsigned int gid = m_pTiles[ pos ];

				// gid are stored in little endian.
				// if host is big endian, then swap
				//if( o == CFByteOrderBigEndian )
				//	gid = CFSwapInt32( gid );
				/* We support little endian.*/

				// XXX: gid == 0 --> empty tile
				if( gid != 0 ) 
				{
					this->appendTileForGID(gid, ccp((float)x, (float)y));

					// Optimization: update min and max GID rendered by the layer
					m_uMinGID = MIN(gid, m_uMinGID);
					m_uMaxGID = MAX(gid, m_uMaxGID);
				}
			}
		}

		NSAssert( m_uMaxGID >= m_pTileSet->m_uFirstGid &&
			m_uMinGID >= m_pTileSet->m_uFirstGid, "TMX: Only 1 tilset per layer is supported");	
	}

	// CCTMXLayer - Properties
	NSString *CCTMXLayer::propertyNamed(const char *propertyName)
	{
		return m_pProperties->objectForKey(std::string(propertyName));
	}
	void CCTMXLayer::parseInternalProperties()
	{
		// if cc_vertex=automatic, then tiles will be rendered using vertexz

		NSString *vertexz = propertyNamed("cc_vertexz");
		if( vertexz ) 
		{
			if( vertexz->m_sString == "automatic" )
			{
				m_bUseAutomaticVertexZ = true;
			}
			else
			{
				m_nVertexZvalue = vertexz->toInt();
			}
		}

		NSString *alphaFuncVal = propertyNamed("cc_alpha_func");
		if (alphaFuncVal)
		{
			m_fAlphaFuncValue = alphaFuncVal->toFloat();
		}
	}

	// CCTMXLayer - obtaining tiles/gids
	CCSprite * CCTMXLayer::tileAt(CGPoint pos)
	{
		NSAssert( pos.x < m_tLayerSize.width && pos.y < m_tLayerSize.height && pos.x >=0 && pos.y >=0, "TMXLayer: invalid position");
		NSAssert( m_pTiles && m_pAtlasIndexArray, "TMXLayer: the tiles map has been released");

		CCSprite *tile = NULL;
		unsigned int gid = this->tileGIDAt(pos);

		// if GID == 0, then no tile is present
		if( gid ) 
		{
			int z = (int)(pos.x + pos.y * m_tLayerSize.width);
			tile = (CCSprite*) this->getChildByTag(z);

			// tile not created yet. create it
			if( ! tile ) 
			{
				CGRect rect = m_pTileSet->rectForGID(gid);
				tile = new CCSprite();
				tile->initWithSpriteSheet((CCSpriteSheetInternalOnly *)this, rect);
				tile->setPositionInPixels(positionAt(pos));
				tile->setVertexZ((float)vertexZForPos(pos));
				tile->setAnchorPoint(CGPointZero);
				tile->setOpacity(m_cOpacity);

				unsigned int indexForZ = atlasIndexForExistantZ(z);
				this->addSpriteWithoutQuad(tile, indexForZ, z);
				tile->release();
			}
		}
		return tile;
	}
	unsigned int CCTMXLayer::tileGIDAt(CGPoint pos)
	{
		NSAssert( pos.x < m_tLayerSize.width && pos.y < m_tLayerSize.height && pos.x >=0 && pos.y >=0, "TMXLayer: invalid position");
		NSAssert( m_pTiles && m_pAtlasIndexArray, "TMXLayer: the tiles map has been released");

		int idx = (int)(pos.x + pos.y * m_tLayerSize.width);
		return m_pTiles[ idx ];
	}

	// CCTMXLayer - adding helper methods
	CCSprite * CCTMXLayer::insertTileForGID(unsigned int gid, CGPoint pos)
	{
		CGRect rect = m_pTileSet->rectForGID(gid);

		int z = (int)(pos.x + pos.y * m_tLayerSize.width);

		if( ! m_pReusedTile )
		{
			m_pReusedTile = new CCSprite();
			m_pReusedTile->initWithSpriteSheet((CCSpriteSheetInternalOnly *) this, rect);
		}
		else
		{
			m_pReusedTile->initWithSpriteSheet((CCSpriteSheetInternalOnly *) this, rect);
		}
		m_pReusedTile->setPositionInPixels(positionAt(pos));
		m_pReusedTile->setVertexZ((float)vertexZForPos(pos));
		m_pReusedTile->setAnchorPoint(CGPointZero);
		m_pReusedTile->setOpacity(m_cOpacity);

		// get atlas index
		unsigned int indexForZ = atlasIndexForNewZ(z);

		// Optimization: add the quad without adding a child
		this->addQuadFromSprite(m_pReusedTile, indexForZ);

		// insert it into the local atlasindex array
		ccCArrayInsertValueAtIndex(m_pAtlasIndexArray, (void*)z, indexForZ);

		// update possible children
		if (m_pChildren && m_pChildren->count()>0)
		{
			NSMutableArray<CCNode*>::NSMutableArrayIterator it;
			CCSprite *pSprite = NULL;
			for (it = m_pChildren->begin(); it != m_pChildren->end(); ++it)
			{
				pSprite = (CCSprite*)(*it);
				if (pSprite)
				{
					unsigned int ai = pSprite->getAtlasIndex();
					if ( ai >= indexForZ )
					{
						pSprite->setAtlasIndex(ai+1);
					}
				}
			}
		}
		m_pTiles[z] = gid;
		return m_pReusedTile;
	}
	CCSprite * CCTMXLayer::updateTileForGID(unsigned int gid, CGPoint pos)	
	{
		CGRect rect = m_pTileSet->rectForGID(gid);
		int z = (int)(pos.x + pos.y * m_tLayerSize.width);

		if( ! m_pReusedTile )
		{
			m_pReusedTile = new CCSprite();
			m_pReusedTile->initWithSpriteSheet((CCSpriteSheetInternalOnly *) this, rect);
		}
		else
		{
			m_pReusedTile->initWithSpriteSheet((CCSpriteSheetInternalOnly *) this, rect);
		}
		
		m_pReusedTile->setPositionInPixels(positionAt(pos));
		m_pReusedTile->setVertexZ((float)vertexZForPos(pos));
		m_pReusedTile->setAnchorPoint(CGPointZero);
		m_pReusedTile->setOpacity(m_cOpacity);

		// get atlas index
		unsigned int indexForZ = atlasIndexForExistantZ(z);
		m_pReusedTile->setAtlasIndex(indexForZ);
        m_pReusedTile->setDirty(YES);
		m_pReusedTile->updateTransform();
		m_pTiles[z] = gid;

		return m_pReusedTile;
	}

	// used only when parsing the map. useless after the map was parsed
	// since lot's of assumptions are no longer true
	CCSprite * CCTMXLayer::appendTileForGID(unsigned int gid, CGPoint pos)
	{
		CGRect rect = m_pTileSet->rectForGID(gid);

		int z = (int)(pos.x + pos.y * m_tLayerSize.width);

		if( ! m_pReusedTile )
		{
			m_pReusedTile = new CCSprite();
			m_pReusedTile->initWithSpriteSheet((CCSpriteSheetInternalOnly *) this, rect);
		}
		else
		{
			m_pReusedTile->initWithSpriteSheet((CCSpriteSheetInternalOnly *) this, rect);
		}
		
		m_pReusedTile->setPosition(positionAt(pos));
		m_pReusedTile->setVertexZ((float)vertexZForPos(pos));
		m_pReusedTile->setAnchorPoint(CGPointZero);
		m_pReusedTile->setOpacity(m_cOpacity);

		// optimization:
		// The difference between appendTileForGID and insertTileforGID is that append is faster, since
		// it appends the tile at the end of the texture atlas
		unsigned int indexForZ = m_pAtlasIndexArray->num;

		// don't add it using the "standard" way.
		addQuadFromSprite(m_pReusedTile, indexForZ);

		// append should be after addQuadFromSprite since it modifies the quantity values
		ccCArrayInsertValueAtIndex(m_pAtlasIndexArray, (void*)z, indexForZ);

		return m_pReusedTile;
	}

	// CCTMXLayer - atlasIndex and Z
	int compareInts(const void * a, const void * b)
	{
		return ( *(int*)a - *(int*)b );
	}
	unsigned int CCTMXLayer::atlasIndexForExistantZ(unsigned int z)
	{
		int key=z;
		int *item = (int*)bsearch((void*)&key, (void*)&m_pAtlasIndexArray->arr[0], m_pAtlasIndexArray->num, sizeof(void*), compareInts);

		NSAssert( item, "TMX atlas index not found. Shall not happen");

		int index = ((int)item - (int)m_pAtlasIndexArray->arr) / sizeof(void*);
		return index;
	}
	unsigned int CCTMXLayer::atlasIndexForNewZ(int z)
	{
		// XXX: This can be improved with a sort of binary search
		unsigned int i=0;
		for( i=0; i< m_pAtlasIndexArray->num ; i++) 
		{
			int val = (int) m_pAtlasIndexArray->arr[i];
			if( z < val )
				break;
		}	
		return i;
	}

	// CCTMXLayer - adding / remove tiles
	void CCTMXLayer::setTileGID(unsigned int gid, CGPoint pos)
	{
		NSAssert( pos.x < m_tLayerSize.width && pos.y < m_tLayerSize.height && pos.x >=0 && pos.y >=0, "TMXLayer: invalid position");
		NSAssert( m_pTiles && m_pAtlasIndexArray, "TMXLayer: the tiles map has been released");
        NSAssert( gid == 0 || gid >= m_pTileSet->m_uFirstGid, "TMXLayer: invalid gid" );

		unsigned int currentGID = tileGIDAt(pos);

		if( currentGID != gid ) 
		{
			// setting gid=0 is equal to remove the tile
			if( gid == 0 )
			{
				removeTileAt(pos);
			}

			// empty tile. create a new one
			else if( currentGID == 0 )
			{
				insertTileForGID(gid, pos);
			}

			// modifying an existing tile with a non-empty tile
			else 
			{
				unsigned int z = (unsigned int)(pos.x + pos.y * m_tLayerSize.width);
				CCSprite *sprite = (CCSprite*)getChildByTag(z);
				if( sprite )
				{
					CGRect rect = m_pTileSet->rectForGID(gid);
					sprite->setTextureRectInPixels(rect, NO, rect.size);
					m_pTiles[z] = gid;
				} 
				else 
				{
					updateTileForGID(gid, pos);
				}
			}
		}
	}
	void CCTMXLayer::addChild(CCNode * child, int zOrder, int tag)
	{
		NSAssert(0, "addChild: is not supported on CCTMXLayer. Instead use setTileGID:at:/tileAt:");
	}
	void CCTMXLayer::removeChild(CCNode* node, bool cleanup)
	{
		CCSprite *sprite = (CCSprite*)node;
		// allows removing nil objects
		if( ! sprite )
			return;

		NSAssert( m_pChildren->containsObject(sprite), "Tile does not belong to TMXLayer");

		unsigned int atlasIndex = sprite->getAtlasIndex();
		unsigned int zz = (unsigned int) m_pAtlasIndexArray->arr[atlasIndex];
		m_pTiles[zz] = 0;
		ccCArrayRemoveValueAtIndex(m_pAtlasIndexArray, atlasIndex);
		CCSpriteBatchNode::removeChild(sprite, cleanup);
	}
	void CCTMXLayer::removeTileAt(CGPoint pos)
	{
		NSAssert( pos.x < m_tLayerSize.width && pos.y < m_tLayerSize.height && pos.x >=0 && pos.y >=0, "TMXLayer: invalid position");
		NSAssert( m_pTiles && m_pAtlasIndexArray, "TMXLayer: the tiles map has been released");

		unsigned int gid = tileGIDAt(pos);

		if( gid ) 
		{
			unsigned int z = (unsigned int)(pos.x + pos.y * m_tLayerSize.width);
			unsigned int atlasIndex = atlasIndexForExistantZ(z);

			// remove tile from GID map
			m_pTiles[z] = 0;

			// remove tile from atlas position array
			ccCArrayRemoveValueAtIndex(m_pAtlasIndexArray, atlasIndex);

			// remove it from sprites and/or texture atlas
			CCSprite *sprite = (CCSprite*)getChildByTag(z);
			if( sprite )
			{
				CCSpriteBatchNode::removeChild(sprite, true);
			}
			else 
			{
				m_pobTextureAtlas->removeQuadAtIndex(atlasIndex);

				// update possible children
				if (m_pChildren && m_pChildren->count()>0)
				{
					NSMutableArray<CCNode*>::NSMutableArrayIterator it;
					CCSprite *pSprite = NULL;
					for (it = m_pChildren->begin(); it != m_pChildren->end(); ++it)
					{
						pSprite = (CCSprite*)(*it);
						if (pSprite)
						{
							unsigned int ai = pSprite->getAtlasIndex();
							if ( ai >= atlasIndex )
							{
								pSprite->setAtlasIndex(ai-1);
							}
						}
					}
				}
			}
		}
	}

	//CCTMXLayer - obtaining positions, offset
	CGPoint CCTMXLayer::calculateLayerOffset(CGPoint pos)
	{
		CGPoint ret = CGPointZero;
		switch( m_nLayerOrientation ) 
		{
		case CCTMXOrientationOrtho:
			ret = ccp( pos.x * m_tMapTileSize.width, -pos.y *m_tMapTileSize.height);
			break;
		case CCTMXOrientationIso:
			ret = ccp( (m_tMapTileSize.width /2) * (pos.x - pos.y),
				(m_tMapTileSize.height /2 ) * (-pos.x - pos.y) );
			break;
		case CCTMXOrientationHex:
			NSAssert(CGPoint::CGPointEqualToPoint(pos, CGPointZero), "offset for hexagonal map not implemented yet");
			break;
		}
		return ret;	
	}
	CGPoint CCTMXLayer::positionAt(CGPoint pos)
	{
		CGPoint ret = CGPointZero;
		switch( m_nLayerOrientation )
		{
		case CCTMXOrientationOrtho:
			ret = positionForOrthoAt(pos);
			break;
		case CCTMXOrientationIso:
			ret = positionForIsoAt(pos);
			break;
		case CCTMXOrientationHex:
			ret = positionForHexAt(pos);
			break;
		}
		return ret;
	}
	CGPoint CCTMXLayer::positionForOrthoAt(CGPoint pos)
	{
        CGPoint xy = CGPointMake(pos.x * m_tMapTileSize.width,
                                (m_tLayerSize.height - pos.y - 1) * m_tMapTileSize.height);
        return xy;
	}
	CGPoint CCTMXLayer::positionForIsoAt(CGPoint pos)
	{
        CGPoint xy = CGPointMake(m_tMapTileSize.width /2 * ( m_tLayerSize.width + pos.x - pos.y - 1),
                                 m_tMapTileSize.height /2 * (( m_tLayerSize.height * 2 - pos.x - pos.y) - 2));
        return xy;
	}
	CGPoint CCTMXLayer::positionForHexAt(CGPoint pos)
	{
		float diffY = 0;
		if( (int)pos.x % 2 == 1 )
		{
			diffY = -m_tMapTileSize.height/2 ;
		}

        CGPoint xy = CGPointMake(pos.x * m_tMapTileSize.width*3/4,
                                (m_tLayerSize.height - pos.y - 1) * m_tMapTileSize.height + diffY);
        return xy;
	}
	int CCTMXLayer::vertexZForPos(CGPoint pos)
	{
		int ret = 0;
		unsigned int maxVal = 0;
		if( m_bUseAutomaticVertexZ )
		{
			switch( m_nLayerOrientation ) 
			{
			case CCTMXOrientationIso:
				maxVal = (unsigned int)(m_tLayerSize.width + m_tLayerSize.height);
				ret = (int)(-(maxVal - (pos.x + pos.y)));
				break;
			case CCTMXOrientationOrtho:
				ret = (int)(-(m_tLayerSize.height-pos.y));
				break;
			case CCTMXOrientationHex:
				NSAssert(0, "TMX Hexa zOrder not supported");
				break;
			default:
				NSAssert(0, "TMX invalid value");
				break;
			}
		} 
		else
		{
			ret = m_nVertexZvalue;
		}
		return ret;
	}

	// CCTMXLayer - draw
	void CCTMXLayer::draw()
	{
		if( m_bUseAutomaticVertexZ )
		{
			glEnable(GL_ALPHA_TEST);
			glAlphaFunc(GL_GREATER, m_fAlphaFuncValue);
		}

		CCSpriteBatchNode::draw();

		if( m_bUseAutomaticVertexZ )
		{
			glDisable(GL_ALPHA_TEST);
		}
	}

	CCXStringToStringDictionary * CCTMXLayer::getProperties()
	{
		return m_pProperties;
	}
	void CCTMXLayer::setProperties(CCXStringToStringDictionary* var)
	{
		CCX_SAFE_RETAIN(var);
		CCX_SAFE_RELEASE(m_pProperties);
		m_pProperties = var;
	}

}// namespace cocos2d