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        void ofApp::setup(){
    ofSetWindowShape(500, 500);
    gif.setupPaused(40, 80);

    numLayers = 2;
    masker.setup(numLayers, ISOLATE_LAYERS);
    masker.toggleOverlay();
    
    img1.setup("pcb-bw.png");
    img2.setup("rust-tall2.png", 1.0, TEXTURE_OFFSET__MIDDLE__RIGHT_TO_CENTER);
    
    horizontalMasks.setup(200, gif.height);
    
    ofSetWindowShape(1200, 1200);
}

void ofApp::update(){
    masker.beginLayer(0);
    {
        ofBackground(ofColor::black);
        horizontalMasks.draw();
    }
    masker.endLayer(0);
    
    masker.beginMask(0);
    {
        ofBackground(ofColor::black);
        img1.incrementTextureOffsetY(-0.2);
        img1.draw();
    }
    masker.endMask(0);

    masker.beginLayer(1);
    {
        ofBackground(ofColor::black);
        masker.drawLayer(0);
    }
    masker.endLayer(1);
    
    masker.beginMask(1);
    {
        ofBackground(ofColor::black);
        img2.incrementTextureOffsetY(0.02);
        img2.setTextureScale(ofMap(sin(ofGetFrameNum() * 0.125), -1, 1, 0.5, 1.5));
        img2.draw();
    }
    masker.endMask(1);
}

void ofApp::draw(){
    gif.begin();
    {
        ofEnableAlphaBlending();
        ofBackground(ofColor::red);
        int i = 0;
        while(i < 1000) {
            i += ofRandom(90, 360);
            gif.rotateAroundCenter(i);
            masker.draw();
        }
    }
    gif.endCaptureDraw();
    masker.drawOverlay();
}

void MaskArray::setup(int _number, float _size) {
    number = _number;
    size = _size;
    unitSize = size / number;
    
    for(int i = 0; i < size; i++) {
        alphas.push_back(ofRandom(255));
        speeds.push_back(ceil(ofRandom(6)) * 30);
        directions.push_back(ofRandom(1) > 0.5 ? 1 : -1);
    }
}

void MaskArray::draw() {
    for(int i = 0; i < number; i++) {
        alphas.at(i) += speeds.at(i) * directions.at(i);
        bounce(i);
        ofSetColor(ofColor(ofColor::white, alphas.at(i)));
        ofRect(0, unitSize * i, size, unitSize);
    }
}

void MaskArray::bounce(int i) {
    if(alphas.at(i) < 0) {
        alphas.at(i) = 0;
        directions.at(i) = 1;
    }

    if(alphas.at(i) > 255) {
        alphas.at(i) = 255;
        directions.at(i) = -1;
    }
}

void MaskArray::debug() {
    for(int i = 0; i < number; i++) {
        cout << i << " " << alphas.at(i) << endl;
    }
    
    cout << "=======" << endl << endl << endl;
}