Quadrotor

////////////////////////////////////////////////////////////////////////////

//        File:                FrameBufferObject.cpp

//        Author:                Changchang Wu

//        Description : Implementation of FrameBufferObject Class

//

//

//

//        Copyright (c) 2007 University of North Carolina at Chapel Hill

//        All Rights Reserved

//

//        Permission to use, copy, modify and distribute this software and its

//        documentation for educational, research and non-profit purposes, without

//        fee, and without a written agreement is hereby granted, provided that the

//        above copyright notice and the following paragraph appear in all copies.

//        

//        The University of North Carolina at Chapel Hill make no representations

//        about the suitability of this software for any purpose. It is provided

//        'as is' without express or implied warranty. 

//

//        Please send BUG REPORTS to ccwu@cs.unc.edu

//

////////////////////////////////////////////////////////////////////////////

#include "GL/glew.h"

#include <stdlib.h>

#include "GlobalUtil.h"

#include "FrameBufferObject.h"

//whether use only one FBO globally

int                FrameBufferObject::UseSingleFBO=1;

GLuint        FrameBufferObject::GlobalFBO=0;

//////////////////////////////////////////////////////////////////////

// Construction/Destruction

//////////////////////////////////////////////////////////////////////

FrameBufferObject::FrameBufferObject(int autobind)

{

        if(UseSingleFBO && GlobalFBO)

        {

                _fboID = GlobalFBO;

        }else

        {

                glGenFramebuffersEXT(1, &_fboID);

                if(UseSingleFBO )GlobalFBO = _fboID;

        }

        if(autobind )   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _fboID);

}

FrameBufferObject::~FrameBufferObject()

{

        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);

        if(!UseSingleFBO )

        {

                glDeleteFramebuffersEXT (1,&_fboID);

        }

}

void FrameBufferObject::DeleteGlobalFBO()

{

        if(UseSingleFBO)

        {

                glDeleteFramebuffersEXT (1,&GlobalFBO);

                GlobalFBO = 0;

        }

}

void FrameBufferObject::AttachDepthTexture(GLenum textureTarget, GLuint texID)

{

  glFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, textureTarget, texID, 0);

}

void FrameBufferObject::AttachTexture(GLenum textureTarget, GLenum attachment, GLuint texId)

{

  glFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, attachment, textureTarget, texId, 0);

}

void FrameBufferObject::BindFBO()

{

  glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _fboID);

}

void FrameBufferObject::UnbindFBO()

{

        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);

}

void FrameBufferObject::UnattachTex(GLenum attachment)

{

        glFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, attachment, GL_TEXTURE_2D, 0, 0 );

}

void FrameBufferObject::AttachRenderBuffer(GLenum attachment, GLuint buffID)

{

        glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, attachment, GL_RENDERBUFFER_EXT, buffID);

}

void FrameBufferObject:: UnattachRenderBuffer(GLenum attachment)

{

        glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, attachment, GL_RENDERBUFFER_EXT, 0);

}