A glFBO wrapper for setting up and managing off screen rendering to multiple render targets. More...

#include <FrameBufferObject.h>

Public Member Functions
	FrameBufferObject ()
	empty ctor
	FrameBufferObject (unsigned int _width, unsigned int _height)
	constructor that will set the dimensions of the FBO and init the rener target list
	~FrameBufferObject ()
	dtor
void	bind ()
	make this FBO the active one for drawing
void	unbind ()
	make the default (screen) FBO active
void	create (GLuint _textureId)
	this method creates the fbo render targets and the glFBO itself
void	checkStatus ()
	errors check this FBO
unsigned int	getWidth ()
	accessor for FBO width
unsigned int	getHeight ()
	accessor for FBO height
void	activateAllTargets ()
	acivates 4 targets for drawing
void	bindTextureSlot (GLuint _slot, GLuint _id)
	bind a texture id to an FBO color attachment
void	bindDepthTexture (GLuint textureId)
void	activateTarget (GLuint _id)
	acivate a render target of your choice, starting from 0
Private Attributes
GLuint	m_width
	the FBO width
GLuint	m_height
	the FBO height
GLuint	m_FBOid
	framebuffer id
GLuint	m_RBid
	depth buffer id

Detailed Description

A glFBO wrapper for setting up and managing off screen rendering to multiple render targets.

Definition at line 15 of file FrameBufferObject.h.

Constructor & Destructor Documentation

FrameBufferObject::FrameBufferObject ( ) [inline]

empty ctor

Definition at line 20 of file FrameBufferObject.h.

{}

FrameBufferObject::FrameBufferObject	(	unsigned int	_width,
		unsigned int	_height
	)

constructor that will set the dimensions of the FBO and init the rener target list

Parameters:

[in]	_width	the FBO width
[in]	_height	the FBO height
[in]	_numOfRT	the number of render targets to have

Definition at line 5 of file FrameBufferObject.cpp.

                                                                             :
        m_width(_width),m_height(_height)
{
}

FrameBufferObject::~FrameBufferObject ( )

dtor

Definition at line 10 of file FrameBufferObject.cpp.

{}

Member Function Documentation

void FrameBufferObject::activateAllTargets ( )

acivates 4 targets for drawing

Definition at line 89 of file FrameBufferObject.cpp.

{
    GLenum buffers[] = {
        GL_COLOR_ATTACHMENT0,
        GL_COLOR_ATTACHMENT1,
        GL_COLOR_ATTACHMENT2,
        GL_COLOR_ATTACHMENT3
    };

    glDrawBuffers(4, buffers);
}

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void FrameBufferObject::activateTarget ( GLuint _id )

acivate a render target of your choice, starting from 0

Parameters:

[in] _id the render targets color attachment id

Definition at line 101 of file FrameBufferObject.cpp.

{
    glDrawBuffer(GL_COLOR_ATTACHMENT0 + _id);
}

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void FrameBufferObject::bind ( )

make this FBO the active one for drawing

Definition at line 13 of file FrameBufferObject.cpp.

References m_FBOid, m_height, m_RBid, and m_width.

{
    glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_FBOid);
    glBindRenderbuffer(GL_RENDERBUFFER_EXT, m_RBid);

    glPushAttrib(GL_VIEWPORT_BIT | GL_DEPTH_BUFFER_BIT);
    glViewport(0, 0, m_width, m_height);

}

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void FrameBufferObject::bindDepthTexture ( GLuint textureId )

Definition at line 60 of file FrameBufferObject.cpp.

References m_FBOid.

{
    glBindFramebuffer( GL_FRAMEBUFFER, m_FBOid);
    glFramebufferTexture2D( GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, textureId, 0 );
}

void FrameBufferObject::bindTextureSlot	(	GLuint	_slot,
		GLuint	_id
	)

bind a texture id to an FBO color attachment

Parameters:

[in]	_slot	the color attachment
[in]	_id	the texture id

Definition at line 54 of file FrameBufferObject.cpp.

References m_FBOid.

{
    glBindFramebuffer(GL_FRAMEBUFFER, m_FBOid);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0+_slot,GL_TEXTURE_2D, _id, 0);
}

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void FrameBufferObject::checkStatus ( )

errors check this FBO

Definition at line 30 of file FrameBufferObject.cpp.

{
    GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);

    switch(status)
    {
    case GL_FRAMEBUFFER_COMPLETE:
        std::cout << "Complete FBO" << std::endl;
        break;
    case GL_FRAMEBUFFER_UNSUPPORTED:
        std::cout << "Unsupported FBO" << std::endl;
        break;
    case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
        std::cout << "Incomplete Attatchments" << std::endl;
        break;
    case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
        std::cout << "Missing attatchment" << std::endl;
        break;
    default:
        std::cout << "Weirdness afoot" << std::endl;
        break;
    }
}

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void FrameBufferObject::create ( GLuint _textureId )

this method creates the fbo render targets and the glFBO itself

Definition at line 66 of file FrameBufferObject.cpp.

References checkStatus(), m_FBOid, m_height, m_RBid, and m_width.

                                               {
    // create a renderbuffer object to store depth info
    glGenRenderbuffers(1, &m_RBid);
    glBindRenderbuffer(GL_RENDERBUFFER, m_RBid);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT,
                             m_width, m_height);
    glBindRenderbuffer(GL_RENDERBUFFER, 0);

    // create a framebuffer object
    glGenFramebuffers(1, &m_FBOid);
    glBindFramebuffer(GL_FRAMEBUFFER, m_FBOid);

    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,GL_TEXTURE_2D, _textureId, 0);

    // attach the renderbuffer to depth attachment point
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
                                 GL_RENDERBUFFER, m_RBid);

    checkStatus();
    glBindFramebuffer(GL_FRAMEBUFFER, 0);
    glBindRenderbuffer(GL_RENDERBUFFER, 0);
}

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unsigned int FrameBufferObject::getHeight ( ) [inline]

accessor for FBO height

Returns:: m_height

Definition at line 49 of file FrameBufferObject.h.

References m_height.

{return m_height;}

unsigned int FrameBufferObject::getWidth ( ) [inline]

accessor for FBO width

Returns:: m_width

Definition at line 45 of file FrameBufferObject.h.

References m_width.

{return m_width;}

void FrameBufferObject::unbind ( )

make the default (screen) FBO active

Definition at line 23 of file FrameBufferObject.cpp.

{
    glPopAttrib();
    glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0);
    glBindRenderbuffer(GL_RENDERBUFFER_EXT, 0);
}

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Member Data Documentation

GLuint FrameBufferObject::m_FBOid [private]

framebuffer id

Definition at line 73 of file FrameBufferObject.h.

GLuint FrameBufferObject::m_height [private]

the FBO height

Definition at line 70 of file FrameBufferObject.h.

GLuint FrameBufferObject::m_RBid [private]

depth buffer id

Definition at line 76 of file FrameBufferObject.h.

GLuint FrameBufferObject::m_width [private]

the FBO width

Definition at line 67 of file FrameBufferObject.h.

The documentation for this class was generated from the following files:

FrameBufferObject Class Reference

Public Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation