void ofFbo::setup(Settings settings) {
checkGLSupport();
destroy();
if(settings.width == 0) settings.width = ofGetWidth();
if(settings.height == 0) settings.height = ofGetHeight();
this->settings = settings;
// create main fbo
// this is the main one we bind for drawing into
// all the renderbuffers are attached to this (whether MSAA is enabled or not)
glGenFramebuffers(1, &fbo);
bind();
// If we want both a depth AND a stencil buffer tehn combine them into a single buffer
if( settings.useDepth && settings.useStencil )
{
stencilBuffer = depthBuffer = createAndAttachRenderbuffer(GL_DEPTH_STENCIL, GL_DEPTH_STENCIL_ATTACHMENT);
}
else
{
// if we want a depth buffer, create it, and attach to our main fbo
if(settings.useDepth) depthBuffer = createAndAttachRenderbuffer(GL_DEPTH_COMPONENT, GL_DEPTH_ATTACHMENT);
// if we want a stencil buffer, create it, and attach to our main fbo
if(settings.useStencil) stencilBuffer = createAndAttachRenderbuffer(GL_STENCIL_INDEX, GL_STENCIL_ATTACHMENT);
}
// if we want MSAA, create a new fbo for textures
if(settings.numSamples) glGenFramebuffers(1, &fboTextures);
else fboTextures = fbo;
// now create all textures and color buffers
for(int i=0; i<settings.numColorbuffers; i++) createAndAttachTexture(i);
// if textures are attached to a different fbo (e.g. if using MSAA) check it's status
if(fbo != fboTextures) {
glBindFramebuffer(GL_FRAMEBUFFER, fboTextures);
}
// check everything is ok with this fbo
checkStatus();
// unbind it
unbind();
}
void ofFbo::allocate(Settings _settings) {
if(!checkGLSupport()) return;
destroy();
if(_settings.width == 0) _settings.width = ofGetWidth();
if(_settings.height == 0) _settings.height = ofGetHeight();
if(_settings.numSamples > maxSamples()) {
ofLogWarning() << "clamping numSamples (" << _settings.numSamples << ") to maxSamples (" << maxSamples() << ")";
_settings.numSamples = maxSamples();
}
settings = _settings;
// create main fbo
// this is the main one we bind for drawing into
// all the renderbuffers are attached to this (whether MSAA is enabled or not)
glGenFramebuffers(1, &fbo);
retainFB(fbo);
bind();
if(settings.depthStencilAsTexture && settings.numSamples){
ofLogWarning() << "multisampling not supported with depth as texture, setting 0 samples";
settings.numSamples = 0;
}
//currently depth only works if stencil is enabled.
// http://forum.openframeworks.cc/index.php/topic,6837.0.html
#ifdef TARGET_OPENGLES
if(settings.useDepth){
settings.useStencil = true;
}
if( settings.depthStencilAsTexture ){
settings.depthStencilAsTexture = false;
ofLogWarning() << "ofFbo::Settings depthStencilAsTexture is not available for iOS" << endl;
}
#endif
GLenum depthAttachment;
GLint depthPixelType;
GLint depthFormat;
if( settings.useDepth && settings.useStencil ){
depthFormat = GL_DEPTH_STENCIL;
settings.depthStencilInternalFormat = GL_DEPTH_STENCIL;
depthPixelType = GL_UNSIGNED_INT_24_8;
#ifdef TARGET_OPENGLES
depthAttachment = GL_DEPTH_ATTACHMENT;
#else
depthAttachment = GL_DEPTH_STENCIL_ATTACHMENT;
#endif
}else if(settings.useDepth){
depthPixelType = GL_UNSIGNED_SHORT;
if(settings.depthStencilInternalFormat==GL_DEPTH_COMPONENT16){
depthPixelType = GL_UNSIGNED_SHORT;
}else if(settings.depthStencilInternalFormat==GL_DEPTH_COMPONENT24){
depthPixelType = GL_UNSIGNED_INT;
}
#ifdef GL_DEPTH_COMPONENT32
else if(settings.depthStencilInternalFormat==GL_DEPTH_COMPONENT32){
depthPixelType = GL_UNSIGNED_INT;
}
#endif
depthAttachment = GL_DEPTH_ATTACHMENT;
depthFormat = GL_DEPTH_COMPONENT;
}else if(settings.useStencil){
depthAttachment = GL_STENCIL_ATTACHMENT;
settings.depthStencilInternalFormat = GL_STENCIL_INDEX;
depthFormat = GL_STENCIL_INDEX;
depthPixelType = GL_UNSIGNED_BYTE;
}
//- USE REGULAR RENDER BUFFER
if(!settings.depthStencilAsTexture){
if(settings.useDepth && settings.useStencil){
stencilBuffer = depthBuffer = createAndAttachRenderbuffer(settings.depthStencilInternalFormat, depthAttachment);
retainRB(stencilBuffer);
retainRB(depthBuffer);
}else if(settings.useDepth){
depthBuffer = createAndAttachRenderbuffer(settings.depthStencilInternalFormat, depthAttachment);
retainRB(depthBuffer);
}else if(settings.useStencil){
stencilBuffer = createAndAttachRenderbuffer(settings.depthStencilInternalFormat, depthAttachment);
retainRB(stencilBuffer);
}
//- INSTEAD USE TEXTURE
}else{
if(settings.useDepth || settings.useStencil){
createAndAttachDepthStencilTexture(settings.textureTarget,settings.depthStencilInternalFormat,depthFormat,depthPixelType,depthAttachment);
#ifdef TARGET_OPENGLES
// if there's depth and stencil the texture should be attached as
// depth and stencil attachments
// http://www.khronos.org/registry/gles/extensions/OES/OES_packed_depth_stencil.txt
if(settings.useDepth && settings.useStencil){
glFramebufferTexture2D(GL_FRAMEBUFFER,
GL_STENCIL_ATTACHMENT,
GL_TEXTURE_2D, depthBufferTex.texData.textureID, 0);
}
#endif
}
}
// if we want MSAA, create a new fbo for textures
#ifndef TARGET_OPENGLES
if(settings.numSamples){
glGenFramebuffers(1, &fboTextures);
retainFB(fboTextures);
}else{
fboTextures = fbo;
}
#else
fboTextures = fbo;
if(settings.numSamples){
ofLog(OF_LOG_WARNING,"ofFbo: multisampling not supported in opengles");
}
#endif
// now create all textures and color buffers
for(int i=0; i<settings.numColorbuffers; i++) createAndAttachTexture(i);
// if textures are attached to a different fbo (e.g. if using MSAA) check it's status
if(fbo != fboTextures) {
glBindFramebuffer(GL_FRAMEBUFFER, fboTextures);
}
// check everything is ok with this fbo
checkStatus();
// unbind it
unbind();
bIsAllocated = true;
}
int ofFbo::maxSamples() {
if(_maxSamples<0) checkGLSupport();
return _maxSamples;
}
int ofFbo::maxDrawBuffers() {
if(_maxDrawBuffers<0) checkGLSupport();
return _maxDrawBuffers;
}
int ofFbo::maxColorAttachments() {
if(_maxColorAttachments<0) checkGLSupport();
return _maxColorAttachments;
}
//--------------------------------------------------------------
void ofFbo::allocate(Settings _settings) {
if(!checkGLSupport()) return;
clear();
auto renderer = _settings.renderer.lock();
if(renderer){
settings.renderer = renderer;
}else{
settings.renderer = ofGetGLRenderer();
}
// check that passed values are correct
if(_settings.width <= 0 || _settings.height <= 0){
ofLogError("ofFbo") << "width and height have to be more than 0";
}
if(_settings.numSamples > maxSamples() && maxSamples() > -1) {
ofLogWarning("ofFbo") << "allocate(): clamping numSamples " << _settings.numSamples << " to maxSamples " << maxSamples() << " for frame buffer object" << fbo;
_settings.numSamples = maxSamples();
}
if(_settings.depthStencilAsTexture && _settings.numSamples){
ofLogWarning("ofFbo") << "allocate(): multisampling not supported with depthStencilAsTexture, setting 0 samples for frame buffer object " << fbo;
_settings.numSamples = 0;
}
//currently depth only works if stencil is enabled.
// http://forum.openframeworks.cc/index.php/topic,6837.0.html
#ifdef TARGET_OPENGLES
if(_settings.useDepth){
_settings.useStencil = true;
}
if( _settings.depthStencilAsTexture ){
_settings.depthStencilAsTexture = false;
ofLogWarning("ofFbo") << "allocate(): depthStencilAsTexture is not available for iOS";
}
#endif
GLenum depthAttachment = GL_DEPTH_ATTACHMENT;
if( _settings.useDepth && _settings.useStencil ){
_settings.depthStencilInternalFormat = GL_DEPTH_STENCIL;
#ifdef TARGET_OPENGLES
depthAttachment = GL_DEPTH_ATTACHMENT;
#else
depthAttachment = GL_DEPTH_STENCIL_ATTACHMENT;
#endif
}else if(_settings.useDepth){
depthAttachment = GL_DEPTH_ATTACHMENT;
}else if(_settings.useStencil){
depthAttachment = GL_STENCIL_ATTACHMENT;
_settings.depthStencilInternalFormat = GL_STENCIL_INDEX;
}
// set needed values for allocation on instance settings
// the rest will be set by the corresponding methods during allocation
settings.width = _settings.width;
settings.height = _settings.height;
settings.numSamples = _settings.numSamples;
// create main fbo
// this is the main one we bind for drawing into
// all the renderbuffers are attached to this (whether MSAA is enabled or not)
glGenFramebuffers(1, &fbo);
retainFB(fbo);
GLint previousFboId = 0;
// note that we are using a glGetInteger method here, which may stall the pipeline.
// in the allocate() method, this is not that tragic since this will not be called
// within the draw() loop. Here, we need not optimise for performance, but for
// simplicity and readability .
glGetIntegerv(GL_FRAMEBUFFER_BINDING, &previousFboId);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
//- USE REGULAR RENDER BUFFER
if(!_settings.depthStencilAsTexture){
if(_settings.useDepth && _settings.useStencil){
stencilBuffer = depthBuffer = createAndAttachRenderbuffer(_settings.depthStencilInternalFormat, depthAttachment);
retainRB(stencilBuffer);
retainRB(depthBuffer);
}else if(_settings.useDepth){
depthBuffer = createAndAttachRenderbuffer(_settings.depthStencilInternalFormat, depthAttachment);
retainRB(depthBuffer);
}else if(_settings.useStencil){
stencilBuffer = createAndAttachRenderbuffer(_settings.depthStencilInternalFormat, depthAttachment);
retainRB(stencilBuffer);
}
//- INSTEAD USE TEXTURE
}else{
if(_settings.useDepth || _settings.useStencil){
createAndAttachDepthStencilTexture(_settings.textureTarget,_settings.depthStencilInternalFormat,depthAttachment);
#ifdef TARGET_OPENGLES
// if there's depth and stencil the texture should be attached as
// depth and stencil attachments
// http://www.khronos.org/registry/gles/extensions/OES/OES_packed_depth_stencil.txt
if(_settings.useDepth && _settings.useStencil){
glFramebufferTexture2D(GL_FRAMEBUFFER,
GL_STENCIL_ATTACHMENT,
GL_TEXTURE_2D, depthBufferTex.texData.textureID, 0);
}
#endif
}
}
settings.useDepth = _settings.useDepth;
settings.useStencil = _settings.useStencil;
settings.depthStencilInternalFormat = _settings.depthStencilInternalFormat;
settings.depthStencilAsTexture = _settings.depthStencilAsTexture;
settings.textureTarget = _settings.textureTarget;
settings.wrapModeHorizontal = _settings.wrapModeHorizontal;
settings.wrapModeVertical = _settings.wrapModeVertical;
settings.maxFilter = _settings.maxFilter;
settings.minFilter = _settings.minFilter;
// if we want MSAA, create a new fbo for textures
#ifndef TARGET_OPENGLES
if(_settings.numSamples){
glGenFramebuffers(1, &fboTextures);
retainFB(fboTextures);
}else{
fboTextures = fbo;
}
#else
fboTextures = fbo;
if(_settings.numSamples){
ofLogWarning("ofFbo") << "allocate(): multisampling not supported in OpenGL ES";
}
#endif
// now create all textures and color buffers
if(_settings.colorFormats.size() > 0) {
for(int i=0; i<(int)_settings.colorFormats.size(); i++) createAndAttachTexture(_settings.colorFormats[i], i);
} else if(_settings.numColorbuffers > 0) {
for(int i=0; i<_settings.numColorbuffers; i++) createAndAttachTexture(_settings.internalformat, i);
_settings.colorFormats = settings.colorFormats;
} else {
ofLogWarning("ofFbo") << "allocate(): no color buffers specified for frame buffer object " << fbo;
}
settings.internalformat = _settings.internalformat;
dirty.resize(_settings.colorFormats.size(), true); // we start with all color buffers dirty.
// if textures are attached to a different fbo (e.g. if using MSAA) check it's status
if(fbo != fboTextures) {
glBindFramebuffer(GL_FRAMEBUFFER, fboTextures);
}
// check everything is ok with this fbo
bIsAllocated = checkStatus();
// restore previous framebuffer id
glBindFramebuffer(GL_FRAMEBUFFER, previousFboId);
/* UNCOMMENT OUTSIDE OF DOING RELEASES
// this should never happen
if(settings != _settings) ofLogWarning("ofFbo") << "allocation not complete, passed settings not equal to created ones, this is an internal OF bug";
*/
#ifdef TARGET_ANDROID
ofAddListener(ofxAndroidEvents().reloadGL,this,&ofFbo::reloadFbo);
#endif
}
void ofFbo::setup(Settings _settings) {
checkGLSupport();
destroy();
if(_settings.width == 0) _settings.width = ofGetWidth();
if(_settings.height == 0) _settings.height = ofGetHeight();
settings = _settings;
// create main fbo
// this is the main one we bind for drawing into
// all the renderbuffers are attached to this (whether MSAA is enabled or not)
glGenFramebuffers(1, &fbo);
retainFB(fbo);
bind();
// If we want both a depth AND a stencil buffer tehn combine them into a single buffer
#ifndef TARGET_OPENGLES
if( settings.useDepth && settings.useStencil )
{
stencilBuffer = depthBuffer = createAndAttachRenderbuffer(GL_DEPTH_STENCIL, GL_DEPTH_STENCIL_ATTACHMENT);
retainRB(depthBuffer);
retainRB(stencilBuffer);
}else
#endif
{
// if we want a depth buffer, create it, and attach to our main fbo
if(settings.useDepth){
depthBuffer = createAndAttachRenderbuffer(GL_DEPTH_COMPONENT, GL_DEPTH_ATTACHMENT);
retainRB(depthBuffer);
}
// if we want a stencil buffer, create it, and attach to our main fbo
if(settings.useStencil){
stencilBuffer = createAndAttachRenderbuffer(GL_STENCIL_INDEX, GL_STENCIL_ATTACHMENT);
retainRB(stencilBuffer);
}
}
// if we want MSAA, create a new fbo for textures
#ifndef TARGET_OPENGLES
if(settings.numSamples){
glGenFramebuffers(1, &fboTextures);
retainFB(fboTextures);
}else{
fboTextures = fbo;
}
#else
fboTextures = fbo;
if(settings.numSamples){
ofLog(OF_LOG_WARNING,"ofFbo: multisampling not supported in opengles");
}
#endif
// now create all textures and color buffers
for(int i=0; i<settings.numColorbuffers; i++) createAndAttachTexture(i);
// if textures are attached to a different fbo (e.g. if using MSAA) check it's status
if(fbo != fboTextures) {
glBindFramebuffer(GL_FRAMEBUFFER, fboTextures);
}
// check everything is ok with this fbo
checkStatus();
// unbind it
unbind();
}
void ofFbo::allocate(Settings _settings) {
if(!checkGLSupport()) return;
destroy();
// check that passed values are correct
if(_settings.width == 0) _settings.width = ofGetWidth();
if(_settings.height == 0) _settings.height = ofGetHeight();
if(_settings.numSamples > maxSamples() && maxSamples() > -1) {
ofLogWarning("ofFbo") << "allocate(): clamping numSamples " << _settings.numSamples << " to maxSamples " << maxSamples() << " for frame buffer object" << fbo;
_settings.numSamples = maxSamples();
}
if(_settings.depthStencilAsTexture && _settings.numSamples){
ofLogWarning("ofFbo") << "allocate(): multisampling not supported with depthStencilAsTexture, setting 0 samples for frame buffer object " << fbo;
_settings.numSamples = 0;
}
//currently depth only works if stencil is enabled.
// http://forum.openframeworks.cc/index.php/topic,6837.0.html
#ifdef TARGET_OPENGLES
if(_settings.useDepth){
_settings.useStencil = true;
}
if( _settings.depthStencilAsTexture ){
_settings.depthStencilAsTexture = false;
ofLogWarning("ofFbo") << "allocate(): depthStencilAsTexture is not available for iOS";
}
#endif
GLenum depthAttachment = GL_DEPTH_ATTACHMENT;
if( _settings.useDepth && _settings.useStencil ){
_settings.depthStencilInternalFormat = GL_DEPTH_STENCIL;
#ifdef TARGET_OPENGLES
depthAttachment = GL_DEPTH_ATTACHMENT;
#else
depthAttachment = GL_DEPTH_STENCIL_ATTACHMENT;
#endif
}else if(_settings.useDepth){
depthAttachment = GL_DEPTH_ATTACHMENT;
}else if(_settings.useStencil){
depthAttachment = GL_STENCIL_ATTACHMENT;
_settings.depthStencilInternalFormat = GL_STENCIL_INDEX;
}
// set needed values for allocation on instance settings
// the rest will be set by the corresponding methods during allocation
settings.width = _settings.width;
settings.height = _settings.height;
settings.numSamples = _settings.numSamples;
// create main fbo
// this is the main one we bind for drawing into
// all the renderbuffers are attached to this (whether MSAA is enabled or not)
glGenFramebuffers(1, &fbo);
retainFB(fbo);
bind();
//- USE REGULAR RENDER BUFFER
if(!_settings.depthStencilAsTexture){
if(_settings.useDepth && _settings.useStencil){
stencilBuffer = depthBuffer = createAndAttachRenderbuffer(_settings.depthStencilInternalFormat, depthAttachment);
retainRB(stencilBuffer);
retainRB(depthBuffer);
}else if(_settings.useDepth){
depthBuffer = createAndAttachRenderbuffer(_settings.depthStencilInternalFormat, depthAttachment);
retainRB(depthBuffer);
}else if(_settings.useStencil){
stencilBuffer = createAndAttachRenderbuffer(_settings.depthStencilInternalFormat, depthAttachment);
retainRB(stencilBuffer);
}
//- INSTEAD USE TEXTURE
}else{
if(_settings.useDepth || _settings.useStencil){
createAndAttachDepthStencilTexture(_settings.textureTarget,_settings.depthStencilInternalFormat,depthAttachment);
#ifdef TARGET_OPENGLES
// if there's depth and stencil the texture should be attached as
// depth and stencil attachments
// http://www.khronos.org/registry/gles/extensions/OES/OES_packed_depth_stencil.txt
if(_settings.useDepth && _settings.useStencil){
glFramebufferTexture2D(GL_FRAMEBUFFER,
GL_STENCIL_ATTACHMENT,
GL_TEXTURE_2D, depthBufferTex.texData.textureID, 0);
}
#endif
}
}
settings.useDepth = _settings.useDepth;
settings.useStencil = _settings.useStencil;
settings.depthStencilInternalFormat = _settings.depthStencilInternalFormat;
settings.depthStencilAsTexture = _settings.depthStencilAsTexture;
settings.textureTarget = _settings.textureTarget;
settings.wrapModeHorizontal = _settings.wrapModeHorizontal;
settings.wrapModeVertical = _settings.wrapModeVertical;
// if we want MSAA, create a new fbo for textures
#ifndef TARGET_OPENGLES
if(_settings.numSamples){
glGenFramebuffers(1, &fboTextures);
retainFB(fboTextures);
}else{
fboTextures = fbo;
}
#else
fboTextures = fbo;
if(_settings.numSamples){
ofLogWarning("ofFbo") << "allocate(): multisampling not supported in OpenGL ES";
}
#endif
// now create all textures and color buffers
if(_settings.colorFormats.size() > 0) {
for(int i=0; i<(int)_settings.colorFormats.size(); i++) createAndAttachTexture(_settings.colorFormats[i], i);
} else if(_settings.numColorbuffers > 0) {
for(int i=0; i<_settings.numColorbuffers; i++) createAndAttachTexture(_settings.internalformat, i);
_settings.colorFormats = settings.colorFormats;
} else {
ofLogWarning("ofFbo") << "allocate(): no color buffers specified for frame buffer object " << fbo;
}
settings.internalformat = _settings.internalformat;
// if textures are attached to a different fbo (e.g. if using MSAA) check it's status
if(fbo != fboTextures) {
glBindFramebuffer(GL_FRAMEBUFFER, fboTextures);
}
// check everything is ok with this fbo
bIsAllocated = checkStatus();
// unbind it
unbind();
/* UNCOMMENT OUTSIDE OF DOING RELEASES
// this should never happen
if(settings != _settings) ofLogWarning("ofFbo") << "allocation not complete, passed settings not equal to created ones, this is an internal OF bug";
*/
}
void ofFbo::allocate(Settings _settings) {
if(!checkGLSupport()) return;
destroy();
if(_settings.width == 0) _settings.width = ofGetWidth();
if(_settings.height == 0) _settings.height = ofGetHeight();
settings = _settings;
// create main fbo
// this is the main one we bind for drawing into
// all the renderbuffers are attached to this (whether MSAA is enabled or not)
glGenFramebuffers(1, &fbo);
retainFB(fbo);
bind();
// If we want both a depth AND a stencil buffer tehn combine them into a single buffer
#ifndef TARGET_OPENGLES
if( settings.useDepth && settings.useStencil )
{
stencilBuffer = depthBuffer = createAndAttachRenderbuffer(GL_DEPTH_STENCIL, GL_DEPTH_STENCIL_ATTACHMENT);
retainRB(depthBuffer);
retainRB(stencilBuffer);
}else
#endif
{
// if we want a depth buffer, create it, and attach to our main fbo
if(settings.useDepth){
if(!settings.depthAsTexture){
depthBuffer = createAndAttachRenderbuffer(GL_DEPTH_COMPONENT, GL_DEPTH_ATTACHMENT);
retainRB(depthBuffer);
}else{
glGenTextures(1, &depthBuffer);
//retainRB(depthBuffer);
glBindTexture(GL_TEXTURE_2D, depthBuffer);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
#ifndef TARGET_OPENGLES
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );
#else
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
#endif
glTexImage2D( GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, settings.width, settings.height, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, 0 );
glBindTexture( GL_TEXTURE_2D, 0 );
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,GL_TEXTURE_2D, depthBuffer, 0);
}
}
// if we want a stencil buffer, create it, and attach to our main fbo
if(settings.useStencil){
stencilBuffer = createAndAttachRenderbuffer(GL_STENCIL_INDEX, GL_STENCIL_ATTACHMENT);
retainRB(stencilBuffer);
}
}
// if we want MSAA, create a new fbo for textures
#ifndef TARGET_OPENGLES
if(settings.numSamples){
glGenFramebuffers(1, &fboTextures);
retainFB(fboTextures);
}else{
fboTextures = fbo;
}
#else
fboTextures = fbo;
if(settings.numSamples){
ofLog(OF_LOG_WARNING,"ofFbo: multisampling not supported in opengles");
}
#endif
// now create all textures and color buffers
for(int i=0; i<settings.numColorbuffers; i++) createAndAttachTexture(i);
// if textures are attached to a different fbo (e.g. if using MSAA) check it's status
if(fbo != fboTextures) {
glBindFramebuffer(GL_FRAMEBUFFER, fboTextures);
}
// check everything is ok with this fbo
checkStatus();
// unbind it
unbind();
}