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//Pattern based on http://www.openprocessing.org/sketch/157035

ofxLayerMask masker;
int layerId;

float tx0, ty0, tx1, ty1;
float offset;
ofImage img;
ofTexture tex;
ofPlanePrimitive plane;

float x, y, radians;

void ofApp::setupAnim() {
    masker.setup(width, height);
    layerId = masker.newLayer();
    
    ofDisableArbTex();
    offset = ofRandom(3);
    setupImage("face.png", &img, &tex);

    plane.set(width, height);
    plane.setPosition(halfWidth, halfHeight, 0);
    plane.setResolution(2, 2);
}

void ofApp::setupImage(string file, ofImage *img, ofTexture *tex) {
    img->loadImage(file);
    *tex = img->getTextureReference();
    tex->setTextureWrap(GL_MIRRORED_REPEAT, GL_MIRRORED_REPEAT);
}

void ofApp::drawLayer(ofTexture *tex) {
    plane.mapTexCoords(tx0, ty0, tx1, ty1);
    plane.mapTexCoords(tx1, ty1, tx0, ty0);
    tex->bind();
    plane.draw();
    tex->unbind();
}

void ofApp::updateAnim(){
    masker.beginLayer(layerId);
    ofBackground(ofColor::black);
    ofSetColor(ofColor::white);
    tx0 = 1;
    ty0 = ofGetFrameNum() * 0.0012 + offset;
    tx1 = tx0 - 1;
    ty1 = ty0 - 0.2;
    drawLayer(&tex);
    masker.endLayer(layerId);
    
    masker.beginMask(layerId);
    ofBackground(ofColor::black);
    if(ofGetFrameNum() == 0 || ofRandom(1) > 0.6) {
        ofTriangle(ofRandom(-width, width*2), ofRandom(-height, height*2),
                   ofRandom(-width, width*2), ofRandom(-height, height*2),
                   ofRandom(-width, width*2), ofRandom(-height, height*2));
    } else if(ofRandom(1) > 0.3) {
        offset = ofRandom(3);
    }
    masker.endMask(layerId);
}

void ofApp::drawAnim() {
    if(ofGetFrameNum() == 0) ofBackground(ofColor::black);
    ofSetColor(ofColor::white, 40);
    drawLayer(&tex);

    ofSetColor(ofColor::white, 15);
    ofTranslate(halfWidth, halfHeight);
    for (int i = 0; i < 360; i+=6) {
        for (int q = 0; q < 360; q+=360) {
            radians = ofDegToRad(q + i + ofGetFrameNum() * 5);
            
            x = ofMap(sin(radians) * i, -600, -10, i, 0);
            y = ofMap(cos(radians) * i, -600, -10, 0, i);
            ofCircle(x, y, 2);
            ofCircle(y, x, 2);
            ofCircle(-x, -y, 2);
            ofCircle(-y, -x, 2);
            
            x = ofMap(sin(radians) * i, -600, -10, -i, 0);
            ofCircle(x, y, 2);
            ofCircle(y, x, 2);
            ofCircle(-x, -y, 2);
            ofCircle(-y, -x, 2);
        }
    }
    ofTranslate(-halfWidth, -halfHeight);
    masker.draw();
    if(ofGetFrameNum() == 72) {
        renderGif();
    }
}