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Author: BlackHamm3rJack (posted 2014-06-20 17:31:41, viewed 123 times)

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package org.altervista.blackhamm3rjack.opengl;

import org.lwjgl.LWJGLException;
import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.*;

import static org.lwjgl.opengl.GL11.*;

public class Window {
   protected static final int FLOAT_SIZE = Float.SIZE / Byte.SIZE;

   private float elapsedTime;

   private float lastFrameDuration;
   private double lastFrameTimestamp;
   private double lastFrameTime;

   private boolean executionFlag;

   public final void start(int width, int height) {
      try {
         Display.setTitle("Window");
         Display.setDisplayMode(new DisplayMode(width, height));
         Display.setResizable(true);
         Display.setVSyncEnabled(true);

         Display.create();
      } catch (LWJGLException e) {
         System.out.println("Display initialization error.");
         System.exit(1);
      }

      long startTime = System.nanoTime();

      executionFlag = true;

      init();
      reshape(width, height);

      while (executionFlag && !Display.isCloseRequested()) {
         elapsedTime = (float) ((System.nanoTime() - startTime) / 1000000.0);

         lastFrameTime = System.nanoTime();
         lastFrameDuration = (float) ((lastFrameTime - lastFrameTimestamp) / 1000000.0);
         lastFrameTimestamp = lastFrameTime;

         update();
         display();

         Display.update();

         if (Display.wasResized())
            reshape(Display.getWidth(), Display.getHeight());
      }

      Display.destroy();
   }

   protected void init() {
   }

   protected void display() {
      glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
      glClear(GL_COLOR_BUFFER_BIT);
   }

   protected void reshape(int width, int height) {
      glViewport(0, 0, width, height);
   }

   protected void update() {
      while (Keyboard.next()) {
         if (Keyboard.getEventKeyState()) {
            if (Keyboard.getEventKey() == Keyboard.KEY_ESCAPE) {
               stop();
            }
         }
      }
   }

   protected final float getElapsedTime() {
      return elapsedTime;
   }

   protected final float getLastFrameDuration() {
      return lastFrameDuration;
   }

   protected final void stop() {
      executionFlag = false;
   }
}





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