axmol/cocos2dx/effects/CCGrabber.cpp

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Copyright (c) 2010-2011 cocos2d-x.org
Copyright (c) 2009      On-Core
 
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#include "CCGrabber.h"
#include "ccMacros.h"
#include "CCTexture2D.h"
#include "platform/platform.h"

namespace cocos2d
{
	CCGrabber::CCGrabber(void)
		: m_fbo(0)
		, m_oldFBO(0)
	{
		memset(m_oldClearColor, 0, sizeof(m_oldClearColor));
		m_eGlesVersion = CCConfiguration::sharedConfiguration()->getGlesVersion();

		// If the gles version is lower than GLES_VER_2_0, 
		// all the functions in CCGrabber return directly.
		if (m_eGlesVersion < GLES_VER_2_0)
		{
			return ;
		}

		// generate FBO
		glGenFramebuffers(1, &m_fbo);
	}

	void CCGrabber::grab(CCTexture2D *pTexture)
	{
		// If the gles version is lower than GLES_VER_2_0, 
		// all the functions in CCGrabber return directly.
		if (m_eGlesVersion < GLES_VER_2_0)
		{
			return ;
		}

		glGetIntegerv(GL_FRAMEBUFFER_BINDING, &m_oldFBO);

		// bind
		glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);

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

		// check if it worked (probably worth doing :) )
		GLuint status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
		if (status != GL_FRAMEBUFFER_COMPLETE)
		{
			CCLOG("Frame Grabber: could not attach texture to frmaebuffer");
		}

		glBindFramebuffer(GL_FRAMEBUFFER, m_oldFBO);
	}
	
	void CCGrabber::beforeRender(CCTexture2D *pTexture)
	{
        CC_UNUSED_PARAM(pTexture);
		// If the gles version is lower than GLES_VER_2_0, 
		// all the functions in CCGrabber return directly.
		if (m_eGlesVersion < GLES_VER_2_0)
		{
			return ;
		}

		glGetIntegerv(GL_FRAMEBUFFER_BINDING, &m_oldFBO);
		glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
		// save clear color
		glGetFloatv(GL_COLOR_CLEAR_VALUE, m_oldClearColor);
		// BUG XXX: doesn't work with RGB565.

		/*glClearColor(0, 0, 0, 0);*/

		// BUG #631: To fix #631, uncomment the lines with #631
		// Warning: But it CCGrabber won't work with 2 effects at the same time
		glClearColor(0.0f,0.0f,0.0f,1.0f);	// #631

		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

		glColorMask(true, true, true, false);	// #631
	}

	void CCGrabber::afterRender(cocos2d::CCTexture2D *pTexture)
	{
        CC_UNUSED_PARAM(pTexture);
		// If the gles version is lower than GLES_VER_2_0, 
		// all the functions in CCGrabber return directly.
		if (m_eGlesVersion < GLES_VER_2_0)
		{
			return ;
		}

		glBindFramebuffer(GL_FRAMEBUFFER, m_oldFBO);
		glColorMask(true, true, true, true);	// #631
		// Restore clear color
		glClearColor( m_oldClearColor[0], m_oldClearColor[1], m_oldClearColor[2], m_oldClearColor[3] );
	}

	CCGrabber::~CCGrabber()
	{
		// If the gles version is lower than GLES_VER_2_0, 
		// all the functions in CCGrabber return directly.
		if (m_eGlesVersion < GLES_VER_2_0)
		{
			return ;
		}

		CCLOGINFO("cocos2d: deallocing %p", this);
		glDeleteFramebuffers(1, &m_fbo);
	}
} // end of namespace cocos2d