write an openframeworks application that has a slider controlling a shader and an osc sender that sends out current time

main.cpp

#include "ofMain.h"
#include "ofxOsc.h"

// application settings
const int APP_WIDTH = 1280;
const int APP_HEIGHT = 720;
const string OSC_HOST = "localhost";
const int OSC_PORT = 8888;

// osc sender
ofxOscSender oscSender;

// shader
ofShader shader;

// time
float time = 0;

class ofApp : public ofBaseApp {
public:
  // setup
  void setup() {
    // setup window
    ofSetWindowShape(APP_WIDTH, APP_HEIGHT);
    ofSetFrameRate(60);

    // setup osc sender
    oscSender.setup(OSC_HOST, OSC_PORT);

    // setup shader
    shader.load("shader");
  }

  // update
  void update() {
    // update time
    time += ofGetLastFrameTime();
  }

  // draw
  void draw() {
    // bind shader
    shader.begin();

    // set time uniform
    shader.setUniform1f("time", time);

    // draw quad
    ofDrawRectangle(0, 0, ofGetWidth(), ofGetHeight());

    // unbind shader
    shader.end();

    // send osc message
    ofxOscMessage message;
    message.setAddress("/time");
    message.addFloatArg(time);
    oscSender.sendMessage(message);
  }

  // mouse moved
  void mouseMoved(int x, int y) {
    // set mouse position uniform
    shader.setUniform2f("mouse", x, y);
  }

  // mouse dragged
  void mouseDragged(int x, int y, int button) {
    // set mouse position uniform
    shader.setUniform2f("mouse", x, y);
  }
};

int main() {
  ofSetupOpenGL(APP_WIDTH, APP_HEIGHT, OF_WINDOW);
  ofRunApp(new ofApp());
}