text: /****************************************************************************
  Copyright (c) 2010-2011 cocos2d-x.org
  Copyright (c) 2009      Jason Booth
  
  http://www.cocos2d-x.org
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  ****************************************************************************/
  
  #include "CCConfiguration.h"
  #include "CCRenderTexture.h"
  #include "CCDirector.h"
  #include "platform/platform.h"
  #include "CCImage.h"
  #include "support/ccUtils.h"
  #include "CCTextureCache.h"
  #include "CCFileUtils.h"
  #include "CCGL.h"
  
  namespace cocos2d { 
  
  // implementation CCRenderTexture
  CCRenderTexture::CCRenderTexture()
  : m_pSprite(NULL)
  , m_uFBO(0)
  , m_nOldFBO(0)
  , m_pTexture(0)
  , m_ePixelFormat(kCCTexture2DPixelFormat_RGBA8888)
  , m_pTextureDataBuffer(NULL)
  {
  }
  
  CCRenderTexture::~CCRenderTexture()
  {
      removeAllChildrenWithCleanup(true);
      ccglDeleteFramebuffers(1, &m_uFBO);
  
  	if (NULL != m_pTextureDataBuffer)
  	{
  		delete []m_pTextureDataBuffer;
  		m_pTextureDataBuffer = NULL;
  	}
  	
  }
  
  CCSprite * CCRenderTexture::getSprite()
  {
  	return m_pSprite;
  }
  void CCRenderTexture::setSprite(CCSprite* var)
  {
  	m_pSprite = var;
  }
  
  CCRenderTexture * CCRenderTexture::renderTextureWithWidthAndHeight(int w, int h, CCTexture2DPixelFormat eFormat)
  {
      CCRenderTexture *pRet = new CCRenderTexture();
  
      if(pRet && pRet->initWithWidthAndHeight(w, h, eFormat))
      {
          pRet->autorelease();
          return pRet;
      }
      CC_SAFE_DELETE(pRet);
      return NULL;
  }
  
  CCRenderTexture * CCRenderTexture::renderTextureWithWidthAndHeight(int w, int h)
  {
  	CCRenderTexture *pRet = new CCRenderTexture();
  
      if(pRet && pRet->initWithWidthAndHeight(w, h, kCCTexture2DPixelFormat_RGBA8888))
  	{
  		pRet->autorelease();
  		return pRet;
  	}
  	CC_SAFE_DELETE(pRet)
  	return NULL;
  }
  
  bool CCRenderTexture::initWithWidthAndHeight(int w, int h, CCTexture2DPixelFormat eFormat)
  {
  	// If the gles version is lower than GLES_VER_1_0, 
  	// some extended gles functions can't be implemented, so return false directly.
  	if (CCConfiguration::sharedConfiguration()->getGlesVersion() <= GLES_VER_1_0)
  	{
  		return false;
  	}
  
      bool bRet = false;
      do 
      {
          w *= (int)CC_CONTENT_SCALE_FACTOR();
          h *= (int)CC_CONTENT_SCALE_FACTOR();
  
          glGetIntegerv(GL_FRAMEBUFFER_BINDING_OES, &m_nOldFBO);
  
          // textures must be power of two squared
          unsigned int powW = ccNextPOT(w);
          unsigned int powH = ccNextPOT(h);
  
          void *data = malloc((int)(powW * powH * 4));
          CC_BREAK_IF(! data);
  
          memset(data, 0, (int)(powW * powH * 4));
          m_ePixelFormat = eFormat;
  
          m_pTexture = new CCTexture2D();
          CC_BREAK_IF(! m_pTexture);
  
          m_pTexture->initWithData(data, (CCTexture2DPixelFormat)m_ePixelFormat, powW, powH, CCSizeMake((float)w, (float)h));
          free( data );
  
          // generate FBO
          ccglGenFramebuffers(1, &m_uFBO);
          ccglBindFramebuffer(CC_GL_FRAMEBUFFER, m_uFBO);
  
          // associate texture with FBO
          ccglFramebufferTexture2D(CC_GL_FRAMEBUFFER, CC_GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_pTexture->getName(), 0);
  
          // check if it worked (probably worth doing :) )
          GLuint status = ccglCheckFramebufferStatus(CC_GL_FRAMEBUFFER);
          if (status != CC_GL_FRAMEBUFFER_COMPLETE)
          {
              CCAssert(0, "Render Texture : Could not attach texture to framebuffer");
              CC_SAFE_DELETE(m_pTexture);
              break;
          }
  
          m_pTexture->setAliasTexParameters();
  
          m_pSprite = CCSprite::spriteWithTexture(m_pTexture);
  
          m_pTexture->release();
          m_pSprite->setScaleY(-1);
          this->addChild(m_pSprite);
  
          ccBlendFunc tBlendFunc = {GL_ONE, GL_ONE_MINUS_SRC_ALPHA };
          m_pSprite->setBlendFunc(tBlendFunc);
  
          ccglBindFramebuffer(CC_GL_FRAMEBUFFER, m_nOldFBO);
          bRet = true;
      } while (0);
      return bRet;
      
  }
  
  void CCRenderTexture::begin()
  {
  	// Save the current matrix
  	glPushMatrix();
  
  	CCSize texSize = m_pTexture->getContentSizeInPixels();
  
  	// Calculate the adjustment ratios based on the old and new projections
  	CCSize size = CCDirector::sharedDirector()->getDisplaySizeInPixels();
  	float widthRatio = size.width / texSize.width;
  	float heightRatio = size.height / texSize.height;
  
  	// Adjust the orthographic propjection and viewport
  	ccglOrtho((float)-1.0 / widthRatio,  (float)1.0 / widthRatio, (float)-1.0 / heightRatio, (float)1.0 / heightRatio, -1,1);
      glViewport(0, 0, (GLsizei)texSize.width, (GLsizei)texSize.height);
  //     CCDirector::sharedDirector()->getOpenGLView()->setViewPortInPoints(0, 0, texSize.width, texSize.height);
  
  	glGetIntegerv(CC_GL_FRAMEBUFFER_BINDING, &m_nOldFBO);
  	ccglBindFramebuffer(CC_GL_FRAMEBUFFER, m_uFBO);//Will direct drawing to the frame buffer created above
  
  	// Issue #1145
  	// There is no need to enable the default GL states here
  	// but since CCRenderTexture is mostly used outside the "render" loop
  	// these states needs to be enabled.
  	// Since this bug was discovered in API-freeze (very close of 1.0 release)
  	// This bug won't be fixed to prevent incompatibilities with code.
  	// 
  	// If you understand the above mentioned message, then you can comment the following line
  	// and enable the gl states manually, in case you need them.
  
  	CC_ENABLE_DEFAULT_GL_STATES();	
  }
  
  void CCRenderTexture::beginWithClear(float r, float g, float b, float a)
  {
      this->begin();
  
  	// save clear color
  	GLfloat	clearColor[4];
  	glGetFloatv(GL_COLOR_CLEAR_VALUE,clearColor); 
  
  	glClearColor(r, g, b, a);
  	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
  	// restore clear color
  	glClearColor(clearColor[0], clearColor[1], clearColor[2], clearColor[3]);     
  }
  
  #if CC_ENABLE_CACHE_TEXTTURE_DATA
  	void CCRenderTexture::end(bool bIsTOCasheTexture)
  	{
  		if (bIsTOCasheTexture)
  		{
  			if (NULL != m_pTextureDataBuffer)
  			{
  				delete []m_pTextureDataBuffer;
  				m_pTextureDataBuffer = NULL;
  			}
  
  			// to get the rendered texture data
  			CCSize s = m_pTexture->getContentSizeInPixels();
  			int tx = (int)s.width;
  			int ty = (int)s.height;
  			m_pTextureDataBuffer = new GLubyte[tx * ty * 4];
  			glReadPixels(0,0,tx,ty,GL_RGBA,GL_UNSIGNED_BYTE, m_pTextureDataBuffer);
  			VolatileTexture::addDataTexture(m_pTexture, m_pTextureDataBuffer, kTexture2DPixelFormat_RGBA8888, s);
  		}
  
  		ccglBindFramebuffer(CC_GL_FRAMEBUFFER, m_nOldFBO);
  		// Restore the original matrix and viewport
  		glPopMatrix();
  		CCSize size = CCDirector::sharedDirector()->getDisplaySizeInPixels();
  		//	glViewport(0, 0, (GLsizei)size.width, (GLsizei)size.height);
  		CCDirector::sharedDirector()->getOpenGLView()->setViewPortInPoints(0, 0, size.width, size.height);
  	}
  #else
  	void CCRenderTexture::end()
  	{
  		ccglBindFramebuffer(CC_GL_FRAMEBUFFER, m_nOldFBO);
  		// Restore the original matrix and viewport
  		glPopMatrix();
  		CCSize size = CCDirector::sharedDirector()->getDisplaySizeInPixels();
  	//	glViewport(0, 0, (GLsizei)size.width, (GLsizei)size.height);
  		CCDirector::sharedDirector()->getOpenGLView()->setViewPortInPoints(0, 0, size.width, size.height);
  	}
  #endif
  
  void CCRenderTexture::clear(float r, float g, float b, float a)
  {
  	this->beginWithClear(r, g, b, a);
  	this->end();
  }
  
  bool CCRenderTexture::saveBuffer(const char *szFilePath, int x, int y, int nWidth, int nHeight)
  {
  	bool bRet = false;
  
  	CCImage *pImage = new CCImage();
  	if (pImage != NULL && getUIImageFromBuffer(pImage, x, y, nWidth, nHeight))
  	{
  		bRet = pImage->saveToFile(szFilePath);
  	}
  
  	CC_SAFE_DELETE(pImage);
  	return bRet;
  }
  bool CCRenderTexture::saveBuffer(int format, const char *fileName, int x, int y, int nWidth, int nHeight)
  {
  	bool bRet = false;
  	CCAssert(format == kCCImageFormatJPG || format == kCCImageFormatPNG,
  			 "the image can only be saved as JPG or PNG format");
  
  	CCImage *pImage = new CCImage();
  	if (pImage != NULL && getUIImageFromBuffer(pImage, x, y, nWidth, nHeight))
  	{
  		std::string fullpath = CCFileUtils::getWriteablePath() + fileName;
  		
  		bRet = pImage->saveToFile(fullpath.c_str());
  	}
  
  	CC_SAFE_DELETE(pImage);
  
  	return bRet;
  }
  
  /* get buffer as UIImage */
  bool CCRenderTexture::getUIImageFromBuffer(CCImage *pImage, int x, int y, int nWidth, int nHeight)
  {
  	if (NULL == pImage || NULL == m_pTexture)
  	{
  		return false;
  	}
  
  	CCSize s = m_pTexture->getContentSizeInPixels();
  	int tx = (int)s.width;
  	int ty = (int)s.height;
  
  	if (x < 0 || x >= tx || y < 0 || y >= ty)
  	{
  		return false;
  	}
  
  	if (nWidth < 0 
  		|| nHeight < 0
  		|| (0 == nWidth && 0 != nHeight)
  		|| (0 == nHeight && 0 != nWidth))
  	{
  		return false;
  	}
  	
  	// to get the image size to save
  	//		if the saving image domain exeeds the buffer texture domain,
  	//		it should be cut
  	int nSavedBufferWidth = nWidth;
  	int nSavedBufferHeight = nHeight;
  	if (0 == nWidth)
  	{
  		nSavedBufferWidth = tx;
  	}
  	if (0 == nHeight)
  	{
  		nSavedBufferHeight = ty;
  	}
  	nSavedBufferWidth = x + nSavedBufferWidth > tx ? (tx - x): nSavedBufferWidth;
  	nSavedBufferHeight = y + nSavedBufferHeight > ty ? (ty - y): nSavedBufferHeight;
  
  	GLubyte *pBuffer = NULL;
  	GLubyte *pTempData = NULL;
  	bool bRet = false;
  
  	do
  	{
  		CCAssert(m_ePixelFormat == kCCTexture2DPixelFormat_RGBA8888, "only RGBA8888 can be saved as image");
  
  		CC_BREAK_IF(! (pBuffer = new GLubyte[nSavedBufferWidth * nSavedBufferHeight * 4]));
  
  		// On some machines, like Samsung i9000, Motorola Defy,
  		// the dimension need to be a power of 2
  		int nReadBufferWidth = 0;
  		int nReadBufferHeight = 0;
  		int nMaxTextureSize = 0;
  		glGetIntegerv(GL_MAX_TEXTURE_SIZE, &nMaxTextureSize);
  
  		nReadBufferWidth = ccNextPOT(tx);
  		nReadBufferHeight = ccNextPOT(ty);
  
  		CC_BREAK_IF(0 == nReadBufferWidth || 0 == nReadBufferHeight);
  		CC_BREAK_IF(nReadBufferWidth > nMaxTextureSize || nReadBufferHeight > nMaxTextureSize);
  
  		CC_BREAK_IF(! (pTempData = new GLubyte[nReadBufferWidth * nReadBufferHeight * 4]));
  
  		this->begin();
  		glPixelStorei(GL_PACK_ALIGNMENT, 1);
  		glReadPixels(0,0,nReadBufferWidth,nReadBufferHeight,GL_RGBA,GL_UNSIGNED_BYTE, pTempData);
  		this->end();
  
  		// to get the actual texture data 
  		// #640 the image read from rendertexture is upseted
  		for (int i = 0; i < nSavedBufferHeight; ++i)
  		{
  			memcpy(&pBuffer[i * nSavedBufferWidth * 4], 
  				&pTempData[(y + nSavedBufferHeight - i - 1) * nReadBufferWidth * 4 + x * 4], 
  				nSavedBufferWidth * 4);
  		}
  
  		bRet = pImage->initWithImageData(pBuffer, nSavedBufferWidth * nSavedBufferHeight * 4, CCImage::kFmtRawData, nSavedBufferWidth, nSavedBufferHeight, 8);
  	} while (0);
  
  	CC_SAFE_DELETE_ARRAY(pBuffer);
  	CC_SAFE_DELETE_ARRAY(pTempData);
  
  	return bRet;
  }
  
  
  CCData * CCRenderTexture::getUIImageAsDataFromBuffer(int format)
  {
      CC_UNUSED_PARAM(format);
      CCData *  pData     = NULL;
  //@ todo CCRenderTexture::getUIImageAsDataFromBuffer
  
  // #include "Availability.h"
  // #include "UIKit.h"
  
  //     GLubyte * pBuffer   = NULL;
  //     GLubyte * pPixels   = NULL;
  //     do 
  //     {
  //         CC_BREAK_IF(! m_pTexture);
  // 
  //         CCAssert(m_ePixelFormat == kCCTexture2DPixelFormat_RGBA8888, "only RGBA8888 can be saved as image");
  // 
  //         CCSize s = m_pTexture->getContentSizeInPixels();
  //         int tx = s.width;
  //         int ty = s.height;
  // 
  //         int bitsPerComponent = 8;
  //         int bitsPerPixel = 32;
  // 
  //         int bytesPerRow = (bitsPerPixel / 8) * tx;
  //         int myDataLength = bytesPerRow * ty;
  // 
  //         CC_BREAK_IF(! (pBuffer = new GLubyte[tx * ty * 4]));
  //         CC_BREAK_IF(! (pPixels = new GLubyte[tx * ty * 4]));
  // 
  //         this->begin();
  //         glReadPixels(0,0,tx,ty,GL_RGBA,GL_UNSIGNED_BYTE, pBuffer);
  //         this->end();
  // 
  //         int x,y;
  // 
  //         for(y = 0; y <ty; y++) {
  //             for(x = 0; x <tx * 4; x++) {
  //                 pPixels[((ty - 1 - y) * tx * 4 + x)] = pBuffer[(y * 4 * tx + x)];
  //             }
  //         }
  // 
  //         if (format == kCCImageFormatRawData)
  //         {
  //             pData = CCData::dataWithBytesNoCopy(pPixels, myDataLength);
  //             break;
  //         }
  
          //@ todo impliment save to jpg or png
          /*
          CGImageCreate(size_t width, size_t height,
          size_t bitsPerComponent, size_t bitsPerPixel, size_t bytesPerRow,
          CGColorSpaceRef space, CGBitmapInfo bitmapInfo, CGDataProviderRef provider,
          const CGFloat decode[], bool shouldInterpolate,
          CGColorRenderingIntent intent)
          */
          // make data provider with data.
  //         CGBitmapInfo bitmapInfo = kCGImageAlphaPremultipliedLast | kCGBitmapByteOrderDefault;
  //         CGDataProviderRef provider		= CGDataProviderCreateWithData(NULL, pixels, myDataLength, NULL);
  //         CGColorSpaceRef colorSpaceRef	= CGColorSpaceCreateDeviceRGB();
  //         CGImageRef iref					= CGImageCreate(tx, ty,
  //             bitsPerComponent, bitsPerPixel, bytesPerRow,
  //             colorSpaceRef, bitmapInfo, provider,
  //             NULL, false,
  //             kCGRenderingIntentDefault);
  // 
  //         UIImage* image					= [[UIImage alloc] initWithCGImage:iref];
  // 
  //         CGImageRelease(iref);	
  //         CGColorSpaceRelease(colorSpaceRef);
  //         CGDataProviderRelease(provider);
  // 
  // 
  // 
  //         if (format == kCCImageFormatPNG)
  //             data = UIImagePNGRepresentation(image);
  //         else
  //             data = UIImageJPEGRepresentation(image, 1.0f);
  // 
  //         [image release];
  //     } while (0);
  //     
  //     CC_SAFE_DELETE_ARRAY(pBuffer);
  //     CC_SAFE_DELETE_ARRAY(pPixels);
  	return pData;
  }
  
  } // namespace cocos2d
  