FrameBufferObject.cpp

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//      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);
}