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

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all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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****************************************************************************/

#include "Cocos2dDefine.h"
// cocos2d
#include "CCTextureAtlas.h"
#include "CCTextureCache.h"
#include "ccMacros.h"

// support
#include "CCTexture2D.h"

#include <math.h>

//According to some tests GL_TRIANGLE_STRIP is slower, MUCH slower. Probably I'm doing something very wrong

// implementation CCTextureAtlas

namespace   cocos2d {

CCTextureAtlas::CCTextureAtlas()
{

}

CCTextureAtlas::~CCTextureAtlas()
{
	CCLOGINFO("cocos2d: deallocing CCTextureAtlas.");

	CCX_SAFE_FREE(m_pQuads)
	CCX_SAFE_FREE(m_pIndices)

#if CC_TEXTURE_ATLAS_USES_VBO
	glDeleteBuffers(2, m_pBuffersVBO);
#endif // CC_TEXTURE_ATLAS_USES_VBO

	CCX_SAFE_RELEASE(m_pTexture);
}

unsigned int CCTextureAtlas::getTotalQuads()
{
	return m_uTotalQuads;
}

unsigned int CCTextureAtlas::getCapacity()
{
	return m_uCapacity;
}

CCTexture2D* CCTextureAtlas::getTexture()
{
	return m_pTexture;
}

void CCTextureAtlas::setTexture(CCTexture2D * var)
{
	CCX_SAFE_RELEASE(m_pTexture);
	m_pTexture = var;
	CCX_SAFE_RETAIN(m_pTexture);
}

ccV3F_C4B_T2F_Quad* CCTextureAtlas::getQuads()
{
	return m_pQuads;
}

void CCTextureAtlas::setQuads(ccV3F_C4B_T2F_Quad *var)
{
	m_pQuads = var;
}

// TextureAtlas - alloc & init

CCTextureAtlas * CCTextureAtlas::textureAtlasWithFile(const char* file, unsigned int capacity)
{
	CCTextureAtlas * pTextureAtlas = new CCTextureAtlas();
	if(pTextureAtlas && pTextureAtlas->initWithFile(file, capacity))
	{
		pTextureAtlas->autorelease();
		return pTextureAtlas;
	}
	CCX_SAFE_DELETE(pTextureAtlas);
	return NULL;
}

CCTextureAtlas * CCTextureAtlas::textureAtlasWithTexture(CCTexture2D *texture, unsigned int capacity)
{
	CCTextureAtlas * pTextureAtlas = new CCTextureAtlas();
	if (pTextureAtlas && pTextureAtlas->initWithTexture(texture, capacity))
	{
		pTextureAtlas->autorelease();
		return pTextureAtlas;
	}
	CCX_SAFE_DELETE(pTextureAtlas);
	return NULL;
}

bool CCTextureAtlas::initWithFile(const char * file, unsigned int capacity)
{
	// retained in property
	CCTexture2D *texture = CCTextureCache::sharedTextureCache()->addImage(file);	

	return initWithTexture(texture, capacity);
}

bool CCTextureAtlas::initWithTexture(CCTexture2D *texture, unsigned int capacity)
{
	assert(texture != NULL);
	m_uCapacity = capacity;
	m_uTotalQuads = 0;

	// retained in property
	this->m_pTexture = texture;
	CCX_SAFE_RETAIN(m_pTexture);

	m_pQuads = (ccV3F_C4B_T2F_Quad*)calloc( sizeof(ccV3F_C4B_T2F_Quad) * m_uCapacity, 1 );
	m_pIndices = (GLushort *)calloc( sizeof(GLushort) * m_uCapacity * 6, 1 );

	if( ! ( m_pQuads && m_pIndices) ) {
		CCLOG("cocos2d: CCTextureAtlas: not enough memory");
		CCX_SAFE_FREE(m_pQuads)
		CCX_SAFE_FREE(m_pIndices)
		return false;
	}

#if CC_TEXTURE_ATLAS_USES_VBO
	// initial binding
	glGenBuffers(2, &m_pBuffersVBO[0]);		
#endif // CC_TEXTURE_ATLAS_USES_VBO

	this->initIndices();

	return true;
}

char * CCTextureAtlas::description()
{
	char *ret = new char[100];
	sprintf(ret, "<CCTextureAtlas | totalQuads = %u>", m_uTotalQuads);
	return ret;
}


void CCTextureAtlas::initIndices()
{
	for( unsigned int i=0; i < m_uCapacity; i++)
	{
#if CC_TEXTURE_ATLAS_USE_TRIANGLE_STRIP
		m_pIndices[i*6+0] = i*4+0;
		m_pIndices[i*6+1] = i*4+0;
		m_pIndices[i*6+2] = i*4+2;		
		m_pIndices[i*6+3] = i*4+1;
		m_pIndices[i*6+4] = i*4+3;
		m_pIndices[i*6+5] = i*4+3;
#else
		m_pIndices[i*6+0] = i*4+0;
		m_pIndices[i*6+1] = i*4+1;
		m_pIndices[i*6+2] = i*4+2;

		// inverted index. issue #179
		m_pIndices[i*6+3] = i*4+3;
		m_pIndices[i*6+4] = i*4+2;
		m_pIndices[i*6+5] = i*4+1;		
		//		m_pIndices[i*6+3] = i*4+2;
		//		m_pIndices[i*6+4] = i*4+3;
		//		m_pIndices[i*6+5] = i*4+1;	
#endif	
	}

#if CC_TEXTURE_ATLAS_USES_VBO
	glBindBuffer(GL_ARRAY_BUFFER, m_pBuffersVBO[0]);
	glBufferData(GL_ARRAY_BUFFER, sizeof(m_pQuads[0]) * m_uCapacity, m_pQuads, GL_DYNAMIC_DRAW);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_pBuffersVBO[1]);
	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(m_pIndices[0]) * m_uCapacity * 6, m_pIndices, GL_STATIC_DRAW);
	glBindBuffer(GL_ARRAY_BUFFER, 0);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
#endif // CC_TEXTURE_ATLAS_USES_VBO
}

// TextureAtlas - Update, Insert, Move & Remove

void CCTextureAtlas::updateQuad(ccV3F_C4B_T2F_Quad *quad, unsigned int index)
{
	NSAssert( index >= 0 && index < m_uCapacity, "updateQuadWithTexture: Invalid index");

	m_uTotalQuads = max( index+1, m_uTotalQuads);

	m_pQuads[index] = *quad;	
}

void CCTextureAtlas::insertQuad(ccV3F_C4B_T2F_Quad *quad, unsigned int index)
{
	NSAssert( index >= 0 && index < m_uCapacity, "insertQuadWithTexture: Invalid index");

	m_uTotalQuads++;
	NSAssert( m_uTotalQuads <= m_uCapacity, "invalid totalQuads");

	// issue #575. index can be > totalQuads
	int remaining = (m_uTotalQuads-1) - index;

	// last object doesn't need to be moved
	if( remaining > 0) {
		// texture coordinates
		memmove( &m_pQuads[index+1],&m_pQuads[index], sizeof(m_pQuads[0]) * remaining );		
	}

	m_pQuads[index] = *quad;
}

void CCTextureAtlas::insertQuadFromIndex(unsigned int oldIndex, unsigned int newIndex)
{
	NSAssert( newIndex >= 0 && newIndex < m_uTotalQuads, "insertQuadFromIndex:atIndex: Invalid index");
	NSAssert( oldIndex >= 0 && oldIndex < m_uTotalQuads, "insertQuadFromIndex:atIndex: Invalid index");

	if( oldIndex == newIndex )
		return;

	unsigned int howMany = std::abs( oldIndex - newIndex);
	int dst = oldIndex;
	int src = oldIndex + 1;
	if( oldIndex > newIndex) {
		dst = newIndex+1;
		src = newIndex;
	}

	// texture coordinates
	ccV3F_C4B_T2F_Quad quadsBackup = m_pQuads[oldIndex];
	memmove( &m_pQuads[dst],&m_pQuads[src], sizeof(m_pQuads[0]) * howMany );
	m_pQuads[newIndex] = quadsBackup;
}

void CCTextureAtlas::removeQuadAtIndex(unsigned int index)
{
	NSAssert( index >= 0 && index < m_uTotalQuads, "removeQuadAtIndex: Invalid index");

	unsigned int remaining = (m_uTotalQuads-1) - index;


	// last object doesn't need to be moved
	if( remaining ) {
		// texture coordinates
		memmove( &m_pQuads[index],&m_pQuads[index+1], sizeof(m_pQuads[0]) * remaining );
	}

	m_uTotalQuads--;

	NSAssert( m_uTotalQuads >= 0, "invalid totalQuads");
}

void CCTextureAtlas::removeAllQuads()
{
	m_uTotalQuads = 0;
}

// TextureAtlas - Resize
bool CCTextureAtlas::resizeCapacity(unsigned int newCapacity)
{
	if( newCapacity == m_uCapacity )
		return true;

	// update capacity and totolQuads
	m_uTotalQuads = min(m_uTotalQuads, newCapacity);
	m_uCapacity = newCapacity;

	void * tmpQuads = realloc( m_pQuads, sizeof(m_pQuads[0]) * m_uCapacity );
	void * tmpIndices = realloc( m_pIndices, sizeof(m_pIndices[0]) * m_uCapacity * 6 );

	if( ! ( tmpQuads && tmpIndices) ) {
		CCLOG("cocos2d: CCTextureAtlas: not enough memory");
		if( tmpQuads )
			free(tmpQuads);
		else
			free(m_pQuads);

		if( tmpIndices )
			free(tmpIndices);
		else
			free(m_pIndices);

		m_pQuads = NULL;
		m_pIndices = NULL;
		m_uCapacity = m_uTotalQuads = 0;
		return false;
	}

	m_pQuads = (ccV3F_C4B_T2F_Quad *)tmpQuads;
	m_pIndices = (GLushort *)tmpIndices;

	this->initIndices();

	return true;
}

// TextureAtlas - Drawing

void CCTextureAtlas::drawQuads()
{
	this->drawNumberOfQuads(m_uTotalQuads);
}

void CCTextureAtlas::drawNumberOfQuads(unsigned int n)
{	

	glBindTexture(GL_TEXTURE_2D, m_pTexture->getName());

#define kQuadSize sizeof(m_pQuads[0].bl)


#if CC_TEXTURE_ATLAS_USES_VBO
	glBindBuffer(GL_ARRAY_BUFFER, m_pBuffersVBO[0]);

	// XXX: update is done in draw... perhaps it should be done in a timer
	glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(m_pQuads[0]) * n, m_pQuads);

	// vertices
	glVertexPointer(3, GL_FLOAT, kQuadSize, (void*) offsetof( ccV3F_C4B_T2F, vertices));

	// colors
	glColorPointer(4, GL_UNSIGNED_BYTE, kQuadSize, (void*) offsetof( ccV3F_C4B_T2F, colors));

	// texture coords
	glTexCoordPointer(2, GL_FLOAT, kQuadSize, (void*) offsetof( ccV3F_C4B_T2F, texCoords));

	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_pBuffersVBO[1]);
#if CC_TEXTURE_ATLAS_USE_TRIANGLE_STRIP
	glDrawElements(GL_TRIANGLE_STRIP, n*6, GL_UNSIGNED_SHORT, (void*)0);    
#else
	glDrawElements(GL_TRIANGLES, n*6, GL_UNSIGNED_SHORT, (void*)0); 
#endif // CC_TEXTURE_ATLAS_USE_TRIANGLE_STRIP

	glBindBuffer(GL_ARRAY_BUFFER, 0);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

#else // ! CC_TEXTURE_ATLAS_USES_VBO
	
	int offset = (int)m_pQuads;

	// vertex
	int diff = offsetof( ccV3F_C4B_T2F, vertices);
	glVertexPointer(3, GL_FLOAT, kQuadSize, (void*) (offset + diff) );

	// color
	diff = offsetof( ccV3F_C4B_T2F, colors);
	glColorPointer(4, GL_UNSIGNED_BYTE, kQuadSize, (void*)(offset + diff));

	// texture coords
	diff = offsetof( ccV3F_C4B_T2F, texCoords);
	glTexCoordPointer(2, GL_FLOAT, kQuadSize, (void*)(offset + diff));

#if CC_TEXTURE_ATLAS_USE_TRIANGLE_STRIP
	glDrawElements(GL_TRIANGLE_STRIP, n*6, GL_UNSIGNED_SHORT, m_pIndices);	
#else
	glDrawElements(GL_TRIANGLES, n*6, GL_UNSIGNED_SHORT, m_pIndices);	
#endif

#endif // CC_TEXTURE_ATLAS_USES_VBO
}


}//namespace   cocos2d