axmol/cocos2dx/misc_nodes/CCRenderTexture.cpp

/****************************************************************************
Copyright (c) 2010-2011 cocos2d-x.org
Copyright (c) 2009      Jason Booth

http://www.cocos2d-x.org

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#include "CCConfiguration.h"
#include "CCRenderTexture.h"
#include "CCDirector.h"
#include "platform/platform.h"
#include "CCImage.h"
#include "CCGLProgram.h"
#include "ccGLStateCache.h"
#include "CCConfiguration.h"
#include "support/ccUtils.h"
#include "CCTextureCache.h"
#include "CCFileUtils.h"
#include "CCGL.h"
// extern
#include "kazmath/GL/matrix.h"

NS_CC_BEGIN

// implementation CCRenderTexture
CCRenderTexture::CCRenderTexture()
: m_pSprite(NULL)
, m_uFBO(0)
, m_nOldFBO(0)
, m_pTexture(0)
, m_pUITextureImage(NULL)
, m_ePixelFormat(kCCTexture2DPixelFormat_RGBA8888)
{
}

CCRenderTexture::~CCRenderTexture()
{
//TODO: 2.0 remove this line.    removeAllChildrenWithCleanup(true);
    glDeleteFramebuffers(1, &m_uFBO);

	CC_SAFE_DELETE(m_pUITextureImage);
}

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_2_0, 
	// some extended gles functions can't be implemented, so return false directly.
	if (CCConfiguration::sharedConfiguration()->getGlesVersion() < GLES_VER_2_0)
	{
		return false;
	}

	CCAssert(m_ePixelFormat != kCCTexture2DPixelFormat_A8, "only RGB and RGBA formats are valid for a render texture");

    bool bRet = false;
    do 
    {
        w *= (int)CC_CONTENT_SCALE_FACTOR();
        h *= (int)CC_CONTENT_SCALE_FACTOR();

        glGetIntegerv(GL_FRAMEBUFFER_BINDING, &m_nOldFBO);

        // textures must be power of two squared
        unsigned int powW = 0;
        unsigned int powH = 0;

		if( CCConfiguration::sharedConfiguration()->isSupportsNPOT() ) {
			powW = w;
			powH = h;
		} else {
			powW = ccNextPOT(w);
			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
        glGenFramebuffers(1, &m_uFBO);
        glBindFramebuffer(GL_FRAMEBUFFER, m_uFBO);

        // associate texture with FBO
        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_pTexture->getName(), 0);

        // check if it worked (probably worth doing :) )
        CCAssert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE, "Could not attach texture to framebuffer");

        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);

        glBindFramebuffer(GL_FRAMEBUFFER, m_nOldFBO);
        bRet = true;
    } while (0);
    return bRet;
    
}

void CCRenderTexture::begin()
{
	// Save the current matrix
	kmGLPushMatrix();

	const CCSize& texSize = m_pTexture->getContentSizeInPixels();

	// Calculate the adjustment ratios based on the old and new projections
	CCDirector *director = CCDirector::sharedDirector();
	CCSize size = director->getWinSizeInPixels();
	float widthRatio = size.width / texSize.width;
	float heightRatio = size.height / texSize.height;

	// Adjust the orthographic projection and viewport
	glViewport(0, 0, (GLsizei)(texSize.width * CC_CONTENT_SCALE_FACTOR()), (GLsizei)(texSize.height * CC_CONTENT_SCALE_FACTOR()));

	// special viewport for 3d projection + retina display
	if ( director->getProjection() == kCCDirectorProjection3D && CC_CONTENT_SCALE_FACTOR() != 1 )
	{
		glViewport((GLsizei)(-texSize.width/2), (GLsizei)(-texSize.height/2), (GLsizei)(texSize.width * CC_CONTENT_SCALE_FACTOR()), (GLsizei)(texSize.height * CC_CONTENT_SCALE_FACTOR()));
	}

	kmMat4 orthoMatrix;
	kmMat4OrthographicProjection(&orthoMatrix, (float)-1.0 / widthRatio,  (float)1.0 / widthRatio,
		(float)-1.0 / heightRatio, (float)1.0 / heightRatio, -1,1 );
	kmGLMultMatrix(&orthoMatrix);

	glGetIntegerv(GL_FRAMEBUFFER_BINDING, &m_nOldFBO);
	glBindFramebuffer(GL_FRAMEBUFFER, m_uFBO);
}

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]);     
}

void CCRenderTexture::end(bool bIsTOCacheTexture)
{
	glBindFramebuffer(GL_FRAMEBUFFER, m_nOldFBO);
	kmGLPopMatrix();

	CCDirector *director = CCDirector::sharedDirector();

	CCSize size = director->getWinSizeInPixels();

	// restore viewport
	glViewport(0, 0, GLsizei(size.width * CC_CONTENT_SCALE_FACTOR()), GLsizei(size.height * CC_CONTENT_SCALE_FACTOR()));

	// special viewport for 3d projection + retina display
	if ( director->getProjection() == kCCDirectorProjection3D && CC_CONTENT_SCALE_FACTOR() != 1 )
	{
		glViewport((GLsizei)(-size.width/2), (GLsizei)(-size.height/2), (GLsizei)(size.width * CC_CONTENT_SCALE_FACTOR()), (GLsizei)(size.height * CC_CONTENT_SCALE_FACTOR()));
	}

//TODO: Does this line take effect?	director->setProjection(director->getProjection());

#if CC_ENABLE_CACHE_TEXTTURE_DATA
	if (bIsTOCacheTexture)
	{
		CC_SAFE_DELETE(m_pUITextureImage);

		// to get the rendered texture data
		const CCSize& s = m_pTexture->getContentSizeInPixels();
		int tx = (int)s.width;
		int ty = (int)s.height;
		m_pUITextureImage = new CCImage;
		if (m_pUITextureImage == newCCImage())
		{
			VolatileTexture::addDataTexture(m_pTexture, m_pUITextureImage->getData(), kTexture2DPixelFormat_RGBA8888, s);
		} 
		else
		{
			CCLOG("Cache rendertexture failed!");
		}
	}
#endif
}

void CCRenderTexture::clear(float r, float g, float b, float a)
{
	this->beginWithClear(r, g, b, a);
	this->end();
}

bool CCRenderTexture::saveToFile(const char *szFilePath)
{
	bool bRet = false;

	CCImage *pImage = newCCImage();
	if (pImage)
	{
		bRet = pImage->saveToFile(szFilePath, kCCImageFormatJPEG);
	}

	CC_SAFE_DELETE(pImage);
	return bRet;
}
bool CCRenderTexture::saveToFile(const char *fileName, tCCImageFormat format)
{
	bool bRet = false;
	CCAssert(format == kCCImageFormatJPEG || format == kCCImageFormatPNG,
			 "the image can only be saved as JPG or PNG format");

	CCImage *pImage = newCCImage();
	if (pImage)
	{
		std::string fullpath = CCFileUtils::getWriteablePath() + fileName;
		
		bRet = pImage->saveToFile(fullpath.c_str(), true);
	}

	CC_SAFE_DELETE(pImage);

	return bRet;
}

/* get buffer as CCImage */
CCImage* CCRenderTexture::newCCImage()
{
	CCAssert(m_ePixelFormat == kCCTexture2DPixelFormat_RGBA8888, "only RGBA8888 can be saved as image");

	if (NULL == m_pTexture)
	{
		return NULL;
	}

	const CCSize& s = m_pTexture->getContentSizeInPixels();

	// to get the image size to save
	//		if the saving image domain exeeds the buffer texture domain,
	//		it should be cut
	int nSavedBufferWidth = (int)s.width;
	int nSavedBufferHeight = (int)s.height;

	GLubyte *pBuffer = NULL;
	GLubyte *pTempData = NULL;
	CCImage *pImage = new CCImage();

	do
	{
		CC_BREAK_IF(! (pBuffer = new GLubyte[nSavedBufferWidth * nSavedBufferHeight * 4]));


		if(! (pTempData = new GLubyte[nSavedBufferWidth * nSavedBufferHeight * 4]))
		{
			delete[] pBuffer;
			pBuffer = NULL;
			break;
		}

		this->begin();
		glPixelStorei(GL_PACK_ALIGNMENT, 1);
		glReadPixels(0,0,nSavedBufferWidth, nSavedBufferHeight,GL_RGBA,GL_UNSIGNED_BYTE, pTempData);
		this->end(false);

		// 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[(nSavedBufferHeight - i - 1) * nSavedBufferWidth * 4], 
				nSavedBufferWidth * 4);
		}

		pImage->initWithImageData(pBuffer, nSavedBufferWidth * nSavedBufferHeight * 4, CCImage::kFmtRawData, nSavedBufferWidth, nSavedBufferHeight, 8);
	} while (0);

	CC_SAFE_DELETE_ARRAY(pBuffer);
	CC_SAFE_DELETE_ARRAY(pTempData);

	return pImage;
}

NS_CC_END