package cg;
//---------------------------------------------------------------------
import javax.swing.JFrame;
import com.jogamp.opengl.GL2;
import com.jogamp.opengl.GLAutoDrawable;
import com.jogamp.opengl.GLCapabilities;
import com.jogamp.opengl.GLEventListener;
import com.jogamp.opengl.GLProfile;
import com.jogamp.opengl.awt.GLCanvas;
import com.jogamp.opengl.glu.GLU;
import com.jogamp.opengl.util.FPSAnimator;

import java.awt.Font;
import com.jogamp.opengl.util.awt.TextRenderer;
//---------------------------------------------------------------------
public class Main implements GLEventListener {
    static int width = 800;
    static int height = 600;

	private GLU glu = new GLU();
	private float rtri = 0.0f;
	final long initialTime = System.currentTimeMillis();	
	long lastTime = initialTime;
	int frames;
	int fps;
		
	TextRenderer renderer;
	//---------------------------------------------------------------------
	public static void main(String[] args) {
		 
	      final GLProfile profile = GLProfile.get(GLProfile.GL2);
	      GLCapabilities capabilities = new GLCapabilities(profile);
	      final GLCanvas glcanvas = new GLCanvas(capabilities);
	      Main m = new Main();
	      glcanvas.addGLEventListener(m);
	      final JFrame frame = new JFrame ("OpenGL Fenster");
	      frame.getContentPane().add(glcanvas);
	      frame.setSize(width, height);
	      frame.setVisible(true);
	      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	      final FPSAnimator animator = new FPSAnimator( glcanvas, 60,true );
	      animator.start();
	}
	//---------------------------------------------------------------------
	@Override
	public void init(GLAutoDrawable drawable) {
		
		GL2 gl = drawable.getGL().getGL2();
		gl.glClearColor(0.000f, 0.749f, 1.000f, 1.0f);
	    gl.glEnable(GL2.GL_DEPTH_TEST);
	    
	    renderer = new TextRenderer(new Font("SansSerif", Font.BOLD, 50));
	}
	//---------------------------------------------------------------------
	@Override
	public void display(GLAutoDrawable drawable) {
		
		GL2 gl = drawable.getGL().getGL2();
		
		long currentTime = System.currentTimeMillis();
		
		if (currentTime - lastTime > 1000) {
			fps = (int) (frames / ((currentTime - lastTime) / 1000.0f));
			lastTime = currentTime;
			frames = 0;
		}
		
	      gl.glClear( GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT );     
	      
	      gl.glLoadIdentity();
	      gl.glTranslatef(0.0f, 0.0f, -6.0f);
	      gl.glRotatef(rtri, 1.0f, 1.0f, 1.0f);
	      
	      gl.glBegin(GL2.GL_QUADS);
	      
		      gl.glColor3f(1f, 0f, 0f); //red color
		      gl.glVertex3f(1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Top)
		      gl.glVertex3f(-1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Top)
		      gl.glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top)
		      gl.glVertex3f(1.0f, 1.0f, 1.0f); // Bottom Right Of The Quad (Top)
		      
		      gl.glColor3f(0f, 1f, 0f); //green color
		      gl.glVertex3f(1.0f, -1.0f, 1.0f); // Top Right Of The Quad 
		      gl.glVertex3f(-1.0f, -1.0f, 1.0f); // Top Left Of The Quad 
		      gl.glVertex3f(-1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad 
		      gl.glVertex3f(1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad 
		     
		      gl.glColor3f(0f, 0f, 1f); //blue color
		      gl.glVertex3f(1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front)
		      gl.glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front)
		      gl.glVertex3f(-1.0f, -1.0f, 1.0f); // Bottom Left Of The Quad 
		      gl.glVertex3f(1.0f, -1.0f, 1.0f); // Bottom Right Of The Quad 
		      
		      gl.glColor3f(1f, 1f, 0f); //yellow (red + green)
		      gl.glVertex3f(1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad 
		      gl.glVertex3f(-1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad
		      gl.glVertex3f(-1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Back)
		      gl.glVertex3f(1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Back)
		     
		      gl.glColor3f(1f, 0f, 1f); //purple (red + green)
		      gl.glVertex3f(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left)
		      gl.glVertex3f(-1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Left)
		      gl.glVertex3f(-1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad 
		      gl.glVertex3f(-1.0f, -1.0f, 1.0f); // Bottom Right Of The Quad 
		      
		      gl.glColor3f(0f, 1f, 1f); //sky blue (blue + green)
		      gl.glVertex3f(1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Right)
		      gl.glVertex3f(1.0f, 1.0f, 1.0f); // Top Left Of The Quad 
		      gl.glVertex3f(1.0f, -1.0f, 1.0f); // Bottom Left Of The Quad 
		      gl.glVertex3f(1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad 
	      
	      gl.glEnd();
	      //---------------------------------------------------------------------
		  renderer.beginRendering(drawable.getSurfaceWidth(), drawable.getSurfaceHeight());
		      gl.glMatrixMode(GL2.GL_MODELVIEW);
		      gl.glTranslatef(width - 200.0f, height - 200.0f, 0f);
		      gl.glRotatef(45.0f, 0.0f, 0.0f, 1.0f);
		      
		      renderer.setColor(1.0f, 0.5f, 0.0f, 0.8f);
		      renderer.draw("  fps: " + fps, 0, 0);
	      renderer.endRendering(); 
	      //---------------------------------------------------------------------
	      rtri +=0.2f;
		  frames++;
	}
	//---------------------------------------------------------------------
	@Override
	public void dispose(GLAutoDrawable drawable) {}

	@Override
	public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
		final GL2 gl = drawable.getGL().getGL2();
	    final float h = (float) width / (float) height;
	      
        gl.glViewport(0, 0, width, height);
        gl.glMatrixMode(GL2.GL_PROJECTION);
        gl.glLoadIdentity();
        glu.gluPerspective(45.0f, h, 1.0, 20.0); 
        gl.glMatrixMode(GL2.GL_MODELVIEW);
        gl.glLoadIdentity();    
	}
}