Sharing ofFbo between multiple windows: how? (shared_ptr?) [solved]

@eelke wrote:

Hi Guys,

I'm doing some initial testing with the 0.9.0 version, and am really liking the possibility of using multiple windows in one app (without using addons). I can't figure out though how to share a frame buffer (ofFbo) between the windows. (or if this is at all possible). I have a hunch I should use a shared_ptr, but have no clue how to do that yet.

I've tried it based upon the multiWindowOneAppExample project, but this is the only result I get:

main.cpp:

#include "ofMain.h"
#include "ofApp.h"
#include "ofAppGLFWWindow.h"

//========================================================================
int main( ){
    ofGLFWWindowSettings settings;
    settings.width = 300;
    settings.height = 300;
    settings.setPosition(ofVec2f(0,0));
    settings.resizable = true;
    shared_ptr<ofAppBaseWindow> mainWindow = ofCreateWindow(settings);

    settings.width = 300;
    settings.height = 300;
    settings.setPosition(ofVec2f(300,0));
    settings.resizable = true;
    shared_ptr<ofAppBaseWindow> secondWindow = ofCreateWindow(settings);

    shared_ptr<ofApp> mainApp(new ofApp);
    mainApp->setupSecondWindow();
    ofAddListener(secondWindow->events().draw, mainApp.get(), &ofApp::drawSecondWindow);

    ofRunApp(mainWindow, mainApp);
    ofRunMainLoop();
}

ofApp.h:

#pragma once

#include "ofMain.h"

class ofApp : public ofBaseApp{

	public:
		void setup();
		void update();
		void draw();

        void setupSecondWindow();
        void drawSecondWindow(ofEventArgs & args);

        ofFbo fbo;

};

ofApp.cpp:

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup(){

    fbo.allocate(180, 100, GL_RGBA, ofFbo::maxSamples());

}

//--------------------------------------------------------------
void ofApp::update(){

}

//--------------------------------------------------------------
void ofApp::draw(){

    ofBackground(ofColor::black);
    ofSetColor(ofColor::white);
    ofDrawBitmapString("Main Window", 20, 20);

    fbo.begin();

    ofBackground(ofColor::white);
    ofSetColor(ofColor::red);
    ofDrawBitmapString("Frame buffer object", 10, 20);

    // animate the cube
    ofPushMatrix();
    ofTranslate(90, 60);
    ofRotate(sin(ofGetElapsedTimef()) * 180);
    ofDrawRectangle(-25, -25, 50, 50);
    ofPopMatrix();

    fbo.end();

    // draw the fbo
    ofSetColor(ofColor::white);
    fbo.draw(30,30);
    fbo.draw(50,150);


}

//--------------------------------------------------------------
void ofApp::setupSecondWindow(){

}

//--------------------------------------------------------------
void ofApp::drawSecondWindow(ofEventArgs & args){

    ofBackground(ofColor::black);
    ofSetColor(ofColor::white);
    ofDrawBitmapString("Second Window", 20, 20);

    // draw the fbo
    ofSetColor(ofColor::white);
    fbo.draw(30,30);
    fbo.draw(50,150);

}

Any ideas? Thanks!

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