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

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****************************************************************************/

#include "CCAtlasNode.h"
#include "CCTextureAtlas.h"

namespace   cocos2d {

// implementation CCAtlasNode

// CCAtlasNode - Creation & Init

CCAtlasNode::CCAtlasNode()
{
}

CCAtlasNode::~CCAtlasNode()
{
	m_pTextureAtlas->release();
}

CCAtlasNode * CCAtlasNode::atlasWithTileFile(const char *tile, int tileWidth, int tileHeight, int itemsToRender)
{
	CCAtlasNode * pRet = new CCAtlasNode();
	if (pRet->initWithTileFile(tile, tileWidth, tileHeight, itemsToRender))
	{
		pRet->autorelease();
		return pRet;
	}
	CCX_SAFE_DELETE(pRet);
	return NULL;
}

bool CCAtlasNode::initWithTileFile(const char *tile, int tileWidth, int tileHeight, int itemsToRender)
{
	assert(tile != NULL);
	m_nItemWidth  = (int) (tileWidth * CC_CONTENT_SCALE_FACTOR());
	m_nItemHeight = (int) (tileHeight * CC_CONTENT_SCALE_FACTOR());

	m_cOpacity = 255;
	m_tColor = m_tColorUnmodified = ccWHITE;
	m_bIsOpacityModifyRGB = true;

	m_tBlendFunc.src = CC_BLEND_SRC;
	m_tBlendFunc.dst = CC_BLEND_DST;

	// double retain to avoid the autorelease pool
	// also, using: self.textureAtlas supports re-initialization without leaking
	this->m_pTextureAtlas = new CCTextureAtlas();
	m_pTextureAtlas->initWithFile(tile, itemsToRender);
    
	if (! m_pTextureAtlas)
	{
		CCLOG("cocos2d: Could not initialize CCAtlasNode. Invalid Texture.");
		delete this;
		return false;
	}

	this->updateBlendFunc();
	this->updateOpacityModifyRGB();

	this->calculateMaxItems();

	return true;
}


// CCAtlasNode - Atlas generation

void CCAtlasNode::calculateMaxItems()
{
	CGSize s = m_pTextureAtlas->getTexture()->getContentSizeInPixels();
	m_nItemsPerColumn = (int)(s.height / m_nItemHeight);
	m_nItemsPerRow = (int)(s.width / m_nItemWidth);
}

void CCAtlasNode::updateAtlasValues()
{
	NSAssert(false, "CCAtlasNode:Abstract updateAtlasValue not overriden");
	//[NSException raise:@"CCAtlasNode:Abstract" format:@"updateAtlasValue not overriden"];
}

// CCAtlasNode - draw
void CCAtlasNode::draw()
{
	// Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
	// Needed states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_TEXTURE_COORD_ARRAY
	// Unneeded states: GL_COLOR_ARRAY
	glDisableClientState(GL_COLOR_ARRAY);

	glColor4ub( m_tColor.r, m_tColor.g, m_tColor.b, m_cOpacity);

	bool newBlend = m_tBlendFunc.src != CC_BLEND_SRC || m_tBlendFunc.dst != CC_BLEND_DST;
	if(newBlend) 
	{
		glBlendFunc( m_tBlendFunc.src, m_tBlendFunc.dst );
	}

	m_pTextureAtlas->drawQuads();

	if( newBlend )
		glBlendFunc(CC_BLEND_SRC, CC_BLEND_DST);

	// is this chepear than saving/restoring color state ?
	// XXX: There is no need to restore the color to (255,255,255,255). Objects should use the color
	// XXX: that they need
	//	glColor4ub( 255, 255, 255, 255);

	// restore default GL state
	glEnableClientState(GL_COLOR_ARRAY);

}

// CCAtlasNode - RGBA protocol

ccColor3B CCAtlasNode:: getColor()
{
	if(m_bIsOpacityModifyRGB)
	{
		return m_tColorUnmodified;
	}
	return m_tColor;
}

void CCAtlasNode::setColor(ccColor3B color3)
{
	m_tColor = m_tColorUnmodified = color3;

	if( m_bIsOpacityModifyRGB )
	{
		m_tColor.r = color3.r * m_cOpacity/255;
		m_tColor.g = color3.g * m_cOpacity/255;
		m_tColor.b = color3.b * m_cOpacity/255;
	}	
}

GLubyte CCAtlasNode::getOpacity()
{
	return m_cOpacity;
}

void CCAtlasNode::setOpacity(GLubyte opacity)
{
	m_cOpacity = opacity;

	// special opacity for premultiplied textures
	if( m_bIsOpacityModifyRGB )
		this->setColor(m_tColorUnmodified);
}

void CCAtlasNode::setIsOpacityModifyRGB(bool bValue)
{
	ccColor3B oldColor	= this->m_tColor;
	m_bIsOpacityModifyRGB = bValue;
	this->m_tColor		= oldColor;
}

bool CCAtlasNode::getIsOpacityModifyRGB()
{
	return m_bIsOpacityModifyRGB;
}

void CCAtlasNode::updateOpacityModifyRGB()
{
	m_bIsOpacityModifyRGB = m_pTextureAtlas->getTexture()->getHasPremultipliedAlpha();
}

// CCAtlasNode - CocosNodeTexture protocol

ccBlendFunc CCAtlasNode::getBlendFunc()
{
	return m_tBlendFunc;
}

void CCAtlasNode::setBlendFunc(ccBlendFunc blendFunc)
{
	m_tBlendFunc = blendFunc;
}

void CCAtlasNode::updateBlendFunc()
{
	if( ! m_pTextureAtlas->getTexture()->getHasPremultipliedAlpha() ) {
		m_tBlendFunc.src = GL_SRC_ALPHA;
		m_tBlendFunc.dst = GL_ONE_MINUS_SRC_ALPHA;
	}
}

void CCAtlasNode::setTexture(CCTexture2D *texture)
{
	m_pTextureAtlas->setTexture(texture);
	this->updateBlendFunc();
	this->updateOpacityModifyRGB();
}

CCTexture2D * CCAtlasNode::getTexture()
{
	return m_pTextureAtlas->getTexture();
}

void CCAtlasNode::setTextureAtlas(CCTextureAtlas* var)
{
	CCX_SAFE_RETAIN(var);
	CCX_SAFE_RELEASE(m_pTextureAtlas);
	m_pTextureAtlas = var;
}
CCTextureAtlas * CCAtlasNode::getTextureAtlas()
{
	return m_pTextureAtlas;
}

} // namespace   cocos2d