/****************************************************************************
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of this software and associated documentation files (the "Software"), to deal
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****************************************************************************/



/*
* Support for RGBA_4_4_4_4 and RGBA_5_5_5_1 was copied from:
* https://devforums.apple.com/message/37855#37855 by a1studmuffin
*/

#include "CCTexture2D.h"
#include <GLES/glext.h>

#include "ccConfig.h"
#include "ccMacros.h"
#include "CCTexture2D.h"
#include "CCPVRTexture.h"
#include "CCConfiguration.h"
#include "platform/platform.h"

namespace   cocos2d {

#if CC_FONT_LABEL_SUPPORT
// FontLabel support
/// @todo #include "FontManager.h"
/// @todo #include "FontLabelStringDrawing.h"
#endif// CC_FONT_LABEL_SUPPORT


static unsigned int nextPOT(unsigned int x)
{
	x = x - 1;
	x = x | (x >> 1);
	x = x | (x >> 2);
	x = x | (x >> 4);
	x = x | (x >> 8);
	x = x | (x >>16);
	return x + 1;
}

//CLASS IMPLEMENTATIONS:


// If the image has alpha, you can create RGBA8 (32-bit) or RGBA4 (16-bit) or RGB5A1 (16-bit)
// Default is: RGBA8888 (32-bit textures)
static CCTexture2DPixelFormat g_defaultAlphaPixelFormat = kCCTexture2DPixelFormat_Default;

CCTexture2D::CCTexture2D()
{
    m_uName = 0;
}

CCTexture2D::~CCTexture2D()
{
	CCLOGINFO("cocos2d: deallocing CCTexture2D %u.", m_uName);
	if(m_uName)
		glDeleteTextures(1, &m_uName);
}

CCTexture2DPixelFormat CCTexture2D::getPixelFormat()
{
	return m_ePixelFormat;
}

unsigned int CCTexture2D::getPixelsWide()
{
	return m_uPixelsWide;
}

unsigned int CCTexture2D::getPixelsHigh()
{
	return m_uPixelsHigh;
}

GLuint CCTexture2D::getName()
{
	return m_uName;
}

CGSize CCTexture2D::getContentSize()
{
	return m_tContentSize;
}

GLfloat CCTexture2D::getMaxS()
{
	return m_fMaxS;
}

void CCTexture2D::setMaxS(GLfloat maxS)
{
	m_fMaxS = maxS;
}

GLfloat CCTexture2D::getMaxT()
{
	return m_fMaxT;
}

void CCTexture2D::setMaxT(GLfloat maxT)
{
	m_fMaxT = maxT;
}

bool CCTexture2D::getHasPremultipliedAlpha()
{
	return m_bHasPremultipliedAlpha;
}

CCTexture2D * CCTexture2D::initWithData(const void *data, CCTexture2DPixelFormat pixelFormat, unsigned int pixelsWide, unsigned int pixelsHigh, CGSize contentSize)
{
	glGenTextures(1, &m_uName);
	glBindTexture(GL_TEXTURE_2D, m_uName);

	this->setAntiAliasTexParameters();

	// Specify OpenGL texture image

	switch(pixelFormat)
	{
	case kCCTexture2DPixelFormat_RGBA8888:
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, pixelsWide, pixelsHigh, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
		break;
	case kCCTexture2DPixelFormat_RGBA4444:
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, pixelsWide, pixelsHigh, 0, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, data);
		break;
	case kCCTexture2DPixelFormat_RGB5A1:
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, pixelsWide, pixelsHigh, 0, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, data);
		break;
	case kCCTexture2DPixelFormat_RGB565:
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, pixelsWide, pixelsHigh, 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, data);
		break;
	case kCCTexture2DPixelFormat_A8:
		glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, pixelsWide, pixelsHigh, 0, GL_ALPHA, GL_UNSIGNED_BYTE, data);
		break;
	default:;
		NSAssert(0, "NSInternalInconsistencyException");

	}

	m_tContentSize = contentSize;
	m_uPixelsWide = pixelsWide;
	m_uPixelsHigh = pixelsHigh;
	m_ePixelFormat = pixelFormat;
	m_fMaxS = contentSize.width / static_cast<float>(pixelsWide);
	m_fMaxT = contentSize.height / static_cast<float>(pixelsHigh);

	m_bHasPremultipliedAlpha = false;

	return this;
}


char * CCTexture2D::description(void)
{
	char *ret = new char[100];
	sprintf_s(ret, 100, "<CCTexture2D | Name = %u | Dimensions = %u x %u | Coordinates = (%.2f, %.2f)>", m_uName, m_uPixelsWide, m_uPixelsHigh, m_fMaxS, m_fMaxT);
	return ret;
}

// implementation CCTexture2D (Image)

CCTexture2D* CCTexture2D::initWithImage(UIImage * uiImage)
{
	unsigned int POTWide, POTHigh;

	if(uiImage == NULL)
	{
		CCLOG("cocos2d: CCTexture2D. Can't create Texture. UIImage is nil");
		this->release();
		return NULL;
	}

	CCConfiguration *conf = CCConfiguration::sharedConfiguration();

#if CC_TEXTURE_NPOT_SUPPORT
	if( conf->isSupportsNPOT() ) 
	{
		POTWide = uiImage->width();
		POTHigh = uiImage->height();
	}
	else 
#endif
	{
		POTWide = nextPOT(uiImage->width());
		POTHigh = nextPOT(uiImage->height());
	}

	unsigned maxTextureSize = conf->getMaxTextureSize();
	if( POTHigh > maxTextureSize || POTWide > maxTextureSize ) 
	{
		CCLOG("cocos2d: WARNING: Image (%u x %u) is bigger than the supported %u x %u", POTWide, POTHigh, maxTextureSize, maxTextureSize);
		this->release();
		return NULL;
	}

	// always load premultiplied images
	this->initPremultipliedATextureWithImage(uiImage, POTWide, POTHigh);
	return this;
}
/// @todo to be checked
CCTexture2D * CCTexture2D::initPremultipliedATextureWithImage(UIImage *image, unsigned int POTWide, unsigned int POTHigh)
{
	unsigned int					i;
	void*					data = NULL;
	void*					tempData =NULL;
	unsigned int*			inPixel32 = NULL;
	unsigned short*			outPixel16 = NULL;
	bool					hasAlpha;
	CGSize					imageSize;
	CCTexture2DPixelFormat	pixelFormat;

	hasAlpha = image->isAlphaPixelFormat();

	size_t bpp = image->CGImageGetBitsPerComponent();
	int colorSpace = image->CGImageGetColorSpace();

	if(colorSpace)
	{
		if(hasAlpha || bpp >= 8)
			pixelFormat = defaultAlphaPixelFormat();
		else
		{
			CCLOG("cocos2d: CCTexture2D: Using RGB565 texture since image has no alpha");
			pixelFormat = kCCTexture2DPixelFormat_RGB565;
		}
	}
	else
	{
		// NOTE: No colorspace means a mask image
		CCLOG("cocos2d: CCTexture2D: Using A8 texture since image is a mask");
		pixelFormat = kCCTexture2DPixelFormat_A8;
	}

	imageSize = CGSizeMake(static_cast<float>(image->width()), static_cast<float>(image->height()));

	// Create the bitmap graphics context

	switch(pixelFormat) {          
		case kCCTexture2DPixelFormat_RGBA8888:
		case kCCTexture2DPixelFormat_RGBA4444:
		case kCCTexture2DPixelFormat_RGB5A1:
//			colorSpace = CGColorSpaceCreateDeviceRGB();
//			data = malloc(POTHigh * POTWide * 4);
// 			info = hasAlpha ? kCGImageAlphaPremultipliedLast : kCGImageAlphaNoneSkipLast; 
// 			context = CGBitmapContextCreate(data, POTWide, POTHigh, 8, 4 * POTWide, colorSpace, info | kCGBitmapByteOrder32Big);				
// 			CGColorSpaceRelease(colorSpace);
//			break;
		case kCCTexture2DPixelFormat_RGB565:
//			colorSpace = CGColorSpaceCreateDeviceRGB();
//			data = malloc(POTHigh * POTWide * 4);
// 			info = kCGImageAlphaNoneSkipLast;
// 			context = CGBitmapContextCreate(data, POTWide, POTHigh, 8, 4 * POTWide, colorSpace, info | kCGBitmapByteOrder32Big);
// 			CGColorSpaceRelease(colorSpace);
//			break;
		case kCCTexture2DPixelFormat_A8:
//			data = malloc(POTHigh * POTWide);
// 			info = kCGImageAlphaOnly; 
// 			context = CGBitmapContextCreate(data, POTWide, POTHigh, 8, POTWide, NULL, info);

			/// @todo Get image data and convert to POT mode
			tempData = static_cast<void*>(image->getRGBA8888Data());
			NSAssert(tempData != NULL, "NULL image data.");
			if(image->width() == POTWide && image->height() == POTHigh)
			{
				data = tempData;
			}
			else
			{
				data = new UINT8[POTHigh * POTWide * 4];
				memset(data, 0, POTHigh * POTWide * 4);

				UINT8* pPixelData = (UINT8*) tempData;
				UINT8* pTargetData = (UINT8*) data;

				for(unsigned int y=0; y<image->height(); ++y)
				{
					memcpy(pTargetData+POTWide*4*y, pPixelData+(image->width())*4*y, (image->width())*4);
				}
				delete []tempData;
			}
			break;                    
		default:
			NSAssert(0, "Invalid pixel format");
			//[NSException raise:NSInternalInconsistencyException format:@"Invalid pixel format"];
	}


// 	CGContextClearRect(context, CGRectMake(0, 0, POTWide, POTHigh));
// 	CGContextTranslateCTM(context, 0, POTHigh - imageSize.height);
// 	CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image), CGImageGetHeight(image)), image);

	// Repack the pixel data into the right format

	if(pixelFormat == kCCTexture2DPixelFormat_RGB565) {
		//Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRRGGGGGGBBBBB"
		tempData = new UINT8[POTHigh * POTWide * 2];
		inPixel32 = (unsigned int*)data;
		outPixel16 = (unsigned short*)tempData;
		for(i = 0; i < POTWide * POTHigh; ++i, ++inPixel32)
			*outPixel16++ = ((((*inPixel32 >> 0) & 0xFF) >> 3) << 11) | ((((*inPixel32 >> 8) & 0xFF) >> 2) << 5) | ((((*inPixel32 >> 16) & 0xFF) >> 3) << 0);
		CCX_SAFE_FREE(data);
		data = tempData;

	}
	else if (pixelFormat == kCCTexture2DPixelFormat_RGBA4444) {
		//Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRGGGGBBBBAAAA"
		tempData = new UINT8[POTHigh * POTWide * 2];
		inPixel32 = (unsigned int*)data;
		outPixel16 = (unsigned short*)tempData;
		for(i = 0; i < POTWide * POTHigh; ++i, ++inPixel32)
			*outPixel16++ = 
			((((*inPixel32 >> 0) & 0xFF) >> 4) << 12) | // R
			((((*inPixel32 >> 8) & 0xFF) >> 4) << 8) | // G
			((((*inPixel32 >> 16) & 0xFF) >> 4) << 4) | // B
			((((*inPixel32 >> 24) & 0xFF) >> 4) << 0); // A


		CCX_SAFE_FREE(data);
		data = tempData;

	}
	else if (pixelFormat == kCCTexture2DPixelFormat_RGB5A1) {
		//Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRRGGGGGBBBBBA"
		tempData = new UINT8[POTHigh * POTWide * 2];
		inPixel32 = (unsigned int*)data;
		outPixel16 = (unsigned short*)tempData;
		for(i = 0; i < POTWide * POTHigh; ++i, ++inPixel32)
			*outPixel16++ = 
			((((*inPixel32 >> 0) & 0xFF) >> 3) << 11) | // R
			((((*inPixel32 >> 8) & 0xFF) >> 3) << 6) | // G
			((((*inPixel32 >> 16) & 0xFF) >> 3) << 1) | // B
			((((*inPixel32 >> 24) & 0xFF) >> 7) << 0); // A


		delete []data;
		data = tempData;
	}

	if (data)
	{
		this->initWithData(data, pixelFormat, POTWide, POTHigh, imageSize);

		// should be after calling super init
		m_bHasPremultipliedAlpha = image->isPremultipliedAlpha();

		//CGContextRelease(context);
		CCX_SAFE_DELETE(data);
	}

	return this;
}

// implementation CCTexture2D (Text)
CCTexture2D * CCTexture2D::initWithString(const char *str, const char *fontName, float fontSize)
{
	/** @todo about UIFont
	CGSize dim;

	#if CC_FONT_LABEL_SUPPORT
	ZFont *zFont = [[FontManager sharedManager] zFontWithName:name pointSize:size];
	if (zFont != nil)
	dim = [string sizeWithZFont:zFont];
	else
	#endif
	dim = [string sizeWithFont:[UIFont fontWithName:name size:size]];

	return [self initWithString:string dimensions:dim alignment:UITextAlignmentCenter fontName:name fontSize:size];*/
	return NULL;// tobe deleted
}
CCTexture2D * CCTexture2D::initWithString(const char *str, CGSize dimensions, UITextAlignment alignment, const char *fontName, float fontSize)
	{
/** @todo UITextAlignment
	NSUInteger				width,
	height,
	i;
	CGContextRef			context;
	void*					data;
	CGColorSpaceRef			colorSpace;
	id						uiFont;

	width = dimensions.width;
	if((width != 1) && (width & (width - 1))) {
	i = 1;
	while(i < width)
	i *= 2;
	width = i;
	}
	height = dimensions.height;
	if((height != 1) && (height & (height - 1))) {
	i = 1;
	while(i < height)
	i *= 2;
	height = i;
	}

	colorSpace = CGColorSpaceCreateDeviceGray();
	data = calloc(height, width);
	context = CGBitmapContextCreate(data, width, height, 8, width, colorSpace, kCGImageAlphaNone);
	CGColorSpaceRelease(colorSpace);


	CGContextSetGrayFillColor(context, 1.0f, 1.0f);
	CGContextTranslateCTM(context, 0.0f, height);
	CGContextScaleCTM(context, 1.0f, -1.0f); //NOTE: NSString draws in UIKit referential i.e. renders upside-down compared to CGBitmapContext referential
	UIGraphicsPushContext(context);


	#if CC_FONT_LABEL_SUPPORT
	uiFont = [[FontManager sharedManager] zFontWithName:name pointSize:size];
	if (uiFont != nil)
	[string drawInRect:CGRectMake(0, 0, dimensions.width, dimensions.height) withZFont:uiFont lineBreakMode:UILineBreakModeWordWrap alignment:alignment];
	else
	#endif // CC_FONT_LABEL_SUPPORT
	{
	uiFont = [UIFont fontWithName:name size:size];
	[string drawInRect:CGRectMake(0, 0, dimensions.width, dimensions.height) withFont:uiFont lineBreakMode:UILineBreakModeWordWrap alignment:alignment];
	}
	if( ! uiFont )
	CCLOG(@"cocos2d: Texture2D: Font '%@' not found", name);
	UIGraphicsPopContext();

	self = [self initWithData:data pixelFormat:kCCTexture2DPixelFormat_A8 pixelsWide:width pixelsHigh:height contentSize:dimensions];

	CGContextRelease(context);
	free(data);
	*/
	return this;
}


// implementation CCTexture2D (Drawing)

void CCTexture2D::drawAtPoint(CGPoint point)
{
	GLfloat	coordinates[] = {	
		0.0f,	m_fMaxT,
		m_fMaxS,m_fMaxT,
		0.0f,	0.0f,
		m_fMaxS,0.0f };

	GLfloat	width = (GLfloat)m_uPixelsWide * m_fMaxS,
		height = (GLfloat)m_uPixelsHigh * m_fMaxT;

#if 0
	GLfloat		vertices[] = {	
		-width / 2 + point.x,	-height / 2 + point.y,	0.0f,
		width / 2 + point.x,	-height / 2 + point.y,	0.0f,
		-width / 2 + point.x,	height / 2 + point.y,	0.0f,
		width / 2 + point.x,	height / 2 + point.y,	0.0f };

#else // anchor is done by cocos2d automagically
	GLfloat		vertices[] = {	
		point.x,			point.y,	0.0f,
		width + point.x,	point.y,	0.0f,
		point.x,			height  + point.y,	0.0f,
		width + point.x,	height  + point.y,	0.0f };
#endif

	glBindTexture(GL_TEXTURE_2D, m_uName);
	glVertexPointer(3, GL_FLOAT, 0, vertices);
	glTexCoordPointer(2, GL_FLOAT, 0, coordinates);
	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}

void CCTexture2D::drawInRect(CGRect rect)
{
	GLfloat	coordinates[] = {	
		0.0f,	m_fMaxT,
		m_fMaxS,m_fMaxT,
		0.0f,	0.0f,
		m_fMaxS,0.0f };

	GLfloat	vertices[] = {	rect.origin.x,		rect.origin.y,							/*0.0f,*/
		rect.origin.x + rect.size.width,		rect.origin.y,							/*0.0f,*/
		rect.origin.x,							rect.origin.y + rect.size.height,		/*0.0f,*/
		rect.origin.x + rect.size.width,		rect.origin.y + rect.size.height,		/*0.0f*/ };

	glBindTexture(GL_TEXTURE_2D, m_uName);
	glVertexPointer(2, GL_FLOAT, 0, vertices);
	glTexCoordPointer(2, GL_FLOAT, 0, coordinates);
	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}


// implementation CCTexture2D (PVRTC)

CCTexture2D * CCTexture2D::initWithPVRTCData(const void *data, int level, int bpp, bool hasAlpha, int length)
{
	if( !(CCConfiguration::sharedConfiguration()->isSupportsPVRTC()) )
	{
		CCLOG("cocos2d: WARNING: PVRTC images is not supported.");
		this->release();
		return NULL;
	}

	glGenTextures(1, &m_uName);
	glBindTexture(GL_TEXTURE_2D, m_uName);

	this->setAntiAliasTexParameters();

	GLenum format;
	GLsizei size = length * length * bpp / 8;
	if(hasAlpha) {
		format = (bpp == 4) ? GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG : GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG;
	} else {
		format = (bpp == 4) ? GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG : GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG;
	}
	if(size < 32) {
		size = 32;
	}
	glCompressedTexImage2D(GL_TEXTURE_2D, level, format, length, length, 0, size, data);

	m_tContentSize = CGSizeMake(static_cast<float>(length), static_cast<float>(length));
	m_uPixelsWide = length;
	m_uPixelsHigh = length;
	m_fMaxS = 1.0f;
	m_fMaxT = 1.0f;

	return this;
}

CCTexture2D * CCTexture2D::initWithPVRTCFile(const char* file)
{
	if (! CCConfiguration::sharedConfiguration()->isSupportsPVRTC())
	{
		CCLOG("cocos2d: WARNING: PVRTC images is not supported");
		this->release();
		return NULL;
	}

	CCPVRTexture *pvr = new CCPVRTexture();
	pvr = pvr->initWithContentsOfFile(file);
	if( pvr )
	{
		pvr->setRetainName(true);			// don't dealloc texture on release

		m_uName = pvr->getName();				// texture id
		m_fMaxS = 1.0f;
		m_fMaxT = 1.0f;
		m_uPixelsWide = pvr->getWidth();		// width
		m_uPixelsHigh = pvr->getHeight();		// height
		/// be careful : unsigned int to float
		m_tContentSize = CGSizeMake(static_cast<float>(m_uPixelsWide), static_cast<float>(m_uPixelsHigh));

		pvr->release();

		this->setAntiAliasTexParameters();
	}
	else 
	{
		CCLOG("cocos2d: Couldn't load PVR image");
		this->release();
		return NULL;
	}
	return this;
}

//
// Use to apply MIN/MAG filter
//
// implementation CCTexture2D (GLFilter)

void CCTexture2D::generateMipmap()
{
	NSAssert( m_uPixelsWide == nextPOT(m_uPixelsWide) && m_uPixelsHigh == nextPOT(m_uPixelsHigh), "Mimpap texture only works in POT textures");
	glBindTexture( GL_TEXTURE_2D, this->m_uName );
	/// @todo include what???	glGenerateMipmapOES(GL_TEXTURE_2D);
}

void CCTexture2D::setTexParameters(ccTexParams *texParams)
{
	NSAssert( (m_uPixelsWide == nextPOT(m_uPixelsWide) && m_uPixelsHigh == nextPOT(m_uPixelsHigh)) ||
		(texParams->wrapS == GL_CLAMP_TO_EDGE && texParams->wrapT == GL_CLAMP_TO_EDGE),
		"GL_CLAMP_TO_EDGE should be used in NPOT textures");
	glBindTexture( GL_TEXTURE_2D, this->m_uName );
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, texParams->minFilter );
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, texParams->magFilter );
	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, texParams->wrapS );
	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, texParams->wrapT );
}

void CCTexture2D::setAliasTexParameters()
{
	ccTexParams texParams = { GL_NEAREST, GL_NEAREST, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE };
	this->setTexParameters(&texParams);
}

void CCTexture2D::setAntiAliasTexParameters()
{
	ccTexParams texParams = { GL_LINEAR, GL_LINEAR, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE };
	this->setTexParameters(&texParams);
}

//
// Texture options for images that contains alpha
//
// implementation CCTexture2D (PixelFormat)

void CCTexture2D::setDefaultAlphaPixelFormat(CCTexture2DPixelFormat format)
{
	g_defaultAlphaPixelFormat = format;
}


CCTexture2DPixelFormat CCTexture2D::defaultAlphaPixelFormat()
{
	return g_defaultAlphaPixelFormat;
}

}//namespace   cocos2d