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Author: BrassApparatus (posted 2013-06-27 22:26:30, viewed 144 times)

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package com.brassapparatus.dust.main;

import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.util.glu.GLU.*;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.lwjgl.input.Keyboard;

import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;

/* A derivative of work by Roi Atalla
 * Original Copyright (c) 2012-2013, Roi Atalla
 * All rights reserved.
 */

public abstract class GLProgram {
   private int fps;

   public GLProgram(String name, int width, int height, boolean resizable) {
      Display.setTitle(name);

      try {
         Display.setDisplayMode(new DisplayMode(width, height));
      } catch (Exception exc) {
         exc.printStackTrace();
      }

      Display.setResizable(resizable);

      fps = 60;
   }

   public void setFPS(int fps) {
      this.fps = fps;
   }

   public int getFPS() {
      return fps;
   }
   
   public final void run() {
        try {
                Display.create();
        } catch(Exception exc) {
                exc.printStackTrace();
                System.exit(1);
        }
        
        gameLoop();
}

   private void gameLoop() {
      try {
         init();

         checkGLError("init");

         resized();

         checkGLError("resized");

         long lastTime, lastFPS;
         lastTime = lastFPS = System.nanoTime();
         int frames = 0;

         while (!Display.isCloseRequested() && !Keyboard.isKeyDown(Keyboard.KEY_ESCAPE)) {
            long deltaTime = System.nanoTime() - lastTime;
            lastTime += deltaTime;

            if (Display.wasResized())
               resized();

            while (Keyboard.next()) {
               if (Keyboard.getEventKeyState())
                  keyPressed(Keyboard.getEventKey(),
                        Keyboard.getEventCharacter());
               else
                  keyReleased(Keyboard.getEventKey(),
                        Keyboard.getEventCharacter());
            }

            update(deltaTime);

            checkGLError("update");

            render();

            checkGLError("render");

            Display.update();

            frames++;
            if (System.nanoTime() - lastFPS >= 1e9) {
               System.out.println("FPS: ".concat(String.valueOf(frames)));
               lastFPS += 1e9;
               frames = 0;
            }

            Display.sync(fps);
         }
      } catch (Throwable exc) {
         exc.printStackTrace();
      } finally {
         destroy();
      }
   }

   public void checkGLError(String event) {
      int error;
      if ((error = glGetError()) != GL_NO_ERROR)
         throw new RuntimeException("OpenGL Error during " + event + ": "
               + gluErrorString(error));
   }

   public int getWidth() {
      return Display.getWidth();
   }

   public int getHeight() {
      return Display.getHeight();
   }

   public abstract void init();

   public void resized() {
      glViewport(0, 0, getWidth(), getHeight());
   }

   public void keyPressed(int key, char c) {
   }

   public void keyReleased(int key, char cs) {
   }

   public void update(long deltaTime) {
   }

   public abstract void render();

   public void destroy() {
      Display.destroy();
      System.exit(0);
   }

   protected String readFromFile(String file) {
      try {
         return readFully(getClass().getResourceAsStream(file));
      } catch (Exception exc) {
         throw new RuntimeException("Failure reading file " + file, exc);
      }
   }
   
    public static String readFully(InputStream is) {
        try(BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"))) {
                StringBuilder s = new StringBuilder();
                String l;
                
                while((l = reader.readLine()) != null)
                        s.append(l).append('\n');
                
                return s.toString();
        } catch(Exception exc) {
                throw new RuntimeException("Failure reading input stream", exc);
        }
}

}





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