Source code tutorial CG[LWJGL0016] || Membuat Texture dengan bantuan Library Slick-Util Oleh Sugiarto Cokrowibowo

TutorialLWJGL00161.java

import java.io.IOException;

import org.lwjgl.LWJGLException;
import org.lwjgl.Sys;
import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;
import org.lwjgl.util.glu.GLU;
import org.newdawn.slick.Color;
import org.newdawn.slick.opengl.Texture;
import org.newdawn.slick.opengl.TextureLoader;
import org.newdawn.slick.util.ResourceLoader;


public class TutorialLWJGL00161 {
	String windowTitle = "CG[LWJGL0008] || 3D Shapes";
	public boolean closeRequested = false;
	private Texture texture;
	
	long lastFrameTime; // digunakan untuk menghitung delta
	float quadAngle; // sudut rotasi untuk segi empat
	
	public void run() {
		createWindow();
		getDelta();
		initializeGL();
		initializeTexture();
		
		// main loop
		while (!closeRequested) {
			pollInput();
			updateLogic(getDelta());
			renderGL();
			Display.update();
		}
		
		cleanup();
	}
	
	private void initializeGL() {
		int width = Display.getDisplayMode().getWidth();
		int height = Display.getDisplayMode().getHeight();		
		
		GL11.glEnable(GL11.GL_TEXTURE_2D);               
         
       // enable alpha blending
		GL11.glEnable(GL11.GL_BLEND);
		GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);

		GL11.glViewport(0, 0, width, height); // Reset The Current Viewport
		GL11.glMatrixMode(GL11.GL_PROJECTION); // Select The Projection Matrix
		GL11.glLoadIdentity(); // Reset The Projection Matrix
		GLU.gluPerspective(45.0f, ((float) width / (float) height), 0.1f, 100.0f); // Calculate The Aspect Ratio Of The Window
		GL11.glMatrixMode(GL11.GL_MODELVIEW); // Select The Modelview Matrix
		GL11.glLoadIdentity(); // Reset The Modelview Matrix

		GL11.glShadeModel(GL11.GL_SMOOTH); // Enables Smooth Shading
		GL11.glClearColor(0.20392156862f, 0.59607843137f, 0.85882352941f, 0.0f);
		GL11.glClearDepth(1.0f); // Depth Buffer Setup
		GL11.glEnable(GL11.GL_DEPTH_TEST); // Enables Depth Testing
		GL11.glDepthFunc(GL11.GL_LEQUAL); // The Type Of Depth Test To Do
		GL11.glHint(GL11.GL_PERSPECTIVE_CORRECTION_HINT, GL11.GL_NICEST); // Really Nice Perspective Calculations		
	}
	
	public void initializeTexture() {
        
        try {
            // load texture from PNG file
            texture = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("texture.jpg"));
         
            System.out.println("Texture loaded: "+texture);
            System.out.println(">> Image width: "+texture.getImageWidth());
            System.out.println(">> Image height: "+texture.getImageHeight());
            System.out.println(">> Texture width: "+texture.getTextureWidth());
            System.out.println(">> Texture height: "+texture.getTextureHeight());
            System.out.println(">> Texture ID: "+texture.getTextureID());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
	
	private void updateLogic(int delta) {
		quadAngle -= 0.08f * delta; // memperkecil variabel sudut rotasi quadAngle
	}
	
	private void renderGL() {
        
		GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
		
		Color.white.bind();
        texture.bind();
        GL11.glLoadIdentity(); // Reset The View
		GL11.glTranslatef(0.0f, 0.0f, -4.0f); //Translasi
		GL11.glRotatef(quadAngle, 1.0f, 1.0f, 1.0f); // Rotate The Cube On X, Y & Z

		GL11.glBegin(GL11.GL_QUADS); // Start Drawing The Cube
		GL11.glTexCoord2f(0,0);
		GL11.glVertex3f(1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Top)
        GL11.glTexCoord2f(1,0);
		GL11.glVertex3f(-1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Top)
        GL11.glTexCoord2f(1,1);
		GL11.glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top)
        GL11.glTexCoord2f(0,1);
		GL11.glVertex3f(1.0f, 1.0f, 1.0f); // Bottom Right Of The Quad (Top)

		GL11.glTexCoord2f(0,0);
		GL11.glVertex3f(1.0f, -1.0f, 1.0f); // Top Right Of The Quad (Bottom)
		GL11.glTexCoord2f(1,0);
		GL11.glVertex3f(-1.0f, -1.0f, 1.0f); // Top Left Of The Quad (Bottom)
		GL11.glTexCoord2f(1,1);
		GL11.glVertex3f(-1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Bottom)
		GL11.glTexCoord2f(0,1);
		GL11.glVertex3f(1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Bottom)
		
		GL11.glTexCoord2f(0,0);
		GL11.glVertex3f(1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front)
		GL11.glTexCoord2f(1,0);
		GL11.glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front)
		GL11.glTexCoord2f(1,1);
		GL11.glVertex3f(-1.0f, -1.0f, 1.0f); // Bottom Left Of The Quad (Front)
		GL11.glTexCoord2f(0,1);
		GL11.glVertex3f(1.0f, -1.0f, 1.0f); // Bottom Right Of The Quad (Front)


		GL11.glTexCoord2f(0,0);
		GL11.glVertex3f(1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Back)
		GL11.glTexCoord2f(1,0);
		GL11.glVertex3f(-1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Back)
		GL11.glTexCoord2f(1,1);
		GL11.glVertex3f(-1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Back)
		GL11.glTexCoord2f(0,1);
		GL11.glVertex3f(1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Back)


		GL11.glTexCoord2f(0,0);
		GL11.glVertex3f(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left)
		GL11.glTexCoord2f(1,0);
		GL11.glVertex3f(-1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Left)
		GL11.glTexCoord2f(1,1);
		GL11.glVertex3f(-1.0f, -1.0f, -1.0f); // Bottom Left Of The Quad (Left)
		GL11.glTexCoord2f(0,1);
		GL11.glVertex3f(-1.0f, -1.0f, 1.0f); // Bottom Right Of The Quad (Left)


		GL11.glTexCoord2f(0,0);
		GL11.glVertex3f(1.0f, 1.0f, -1.0f); // Top Right Of The Quad (Right)
		GL11.glTexCoord2f(1,0);
		GL11.glVertex3f(1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right)
		GL11.glTexCoord2f(1,1);
		GL11.glVertex3f(1.0f, -1.0f, 1.0f); // Bottom Left Of The Quad (Right)
		GL11.glTexCoord2f(0,1);
		GL11.glVertex3f(1.0f, -1.0f, -1.0f); // Bottom Right Of The Quad (Right)
		GL11.glEnd(); // Done Drawing The Quad
	}
	
	public void pollInput() {

		// scroll through key events
		while (Keyboard.next()) {
			if (Keyboard.getEventKeyState()) {
				if (Keyboard.getEventKey() == Keyboard.KEY_ESCAPE)
					closeRequested = true;
			}
		}
		
		if (Display.isCloseRequested()) {
			closeRequested = true;
		}
	}
	
	/** 
	 * hitung berapa millisecon aplikasi dijalankan 
	 * 
	 * @return milliseconds passed since last frame 
	 */
	public int getDelta() {
	    long time = (Sys.getTime() * 1000) / Sys.getTimerResolution();
	    int delta = (int) (time - lastFrameTime);
	    lastFrameTime = time;	 
	    return delta;
	}
	
	private void createWindow() {
		try {
			Display.setDisplayMode(new DisplayMode(640, 480));
			Display.setVSyncEnabled(true);
			Display.setTitle(windowTitle);
			Display.create();
		} catch (LWJGLException e) {
			Sys.alert("Error", "Initialization failed!\n\n" + e.getMessage());
			System.exit(0);
		}		
	}
	
	private void cleanup() {
		Display.destroy();
	}
	
	public static void main(String[] args) {
		TutorialLWJGL00161 tutorial = new TutorialLWJGL00161();
		tutorial.run();
	}

}