Easy bloom effect using ofxBlur

easy-bloom-effect.cpp

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup()
{
    ofBackground(0);
    ofSetFrameRate(60);
    ofDisableBlendMode();
    
    blur.setup(ofGetWidth(), ofGetHeight(), 10, .2, 4);
    fbo.allocate(ofGetWidth(), ofGetHeight(), GL_RGBA);
}

//--------------------------------------------------------------
void ofApp::draw()
{
    fbo.begin();
    {
        ofClear(0);
        ofDrawCircle(ofGetWidth()/2, ofGetHeight()/2, 100);
    }
    fbo.end();
    
    blur.begin();
    {
        ofClear(0);
        fbo.draw(0,0);
    }
    blur.end();
    
    blur.draw();
    ofPushStyle();
    {
        ofEnableBlendMode(OF_BLENDMODE_ADD);
        fbo.draw(0,0);
    }
    ofPopStyle();
}