fbObject.h

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// Copyright JRM Enterprises, Inc. 2006
// All rights reserved.
//
// This code is the intellectual property of JRM Enterprises, Inc.
// It may not be used or released as source or compiled binary form
// without the prior written consent of JRM Enterprises, Inc.
//
// Original Authors:    Ken George  

#ifndef FBOBJECT__H
#define FBOBJECT__H

#ifndef __gl_h_
#include <GL/glew.h>
#ifdef _WIN32
#include <GL/wglew.h>
#else
#include <GL/glxew.h>
#endif
#endif

// simple wrapper to encapsulate a framebuffer_object using render-to-texture and its associated texture object

class fbObject {
public:
    fbObject(int width, int height, GLenum target, GLenum texInternalFormat);

    ~fbObject();

    void setPreviousFBO(GLuint id)
    {
        m_prevFBO = id;
    }

    GLuint getPreviousFBO() const
    {
        return m_prevFBO;
    }

    GLuint getCurrentFBO() const
    {
        return m_fbo;
    }

    // activate this fbo for rendering
    void Activate(bool clear = false);
    // activate the standard frame buffer for rendering
    void Deactivate();

    // bind the texture associated with this fbo as texture 
    void Bind()   {  glBindTexture(m_target, m_tex); }

    // release the texture - no operation necessary with fbo
    void Release() {  }

    inline int GetWidth() { return m_width; }
    inline int GetHeight() { return m_height; }

private:

    void CheckFramebufferStatus();

    GLuint m_fbo;    // color render target
    GLuint m_prevFBO;   // Previously bound FBO
    GLuint m_tex;       // texture for each buffer
    GLenum m_target; // texture target type
    int m_width;     // width of fbo/texture
    int m_height;    // height of fbo/texture
};
#endif