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);
}