| /******************************************************************************* |
| * Copyright (c) 2000, 2005 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Sebastian Davids - initial implementation |
| * IBM Corporation |
| *******************************************************************************/ |
| package org.eclipse.swt.snippets; |
| |
| /* |
| * SWT OpenGL snippet: draw a square |
| * |
| * This snippet requires the experimental org.eclipse.swt.opengl plugin, which |
| * is not included in swt by default. For information on this plugin see |
| * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/opengl/opengl.html |
| * |
| * For a list of all SWT example snippets see |
| * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets |
| */ |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.events.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.layout.*; |
| import org.eclipse.swt.opengl.*; |
| import org.eclipse.swt.widgets.*; |
| |
| public class Snippet174 { |
| |
| public static void main(String[] args) { |
| Display display = new Display(); |
| Shell shell = new Shell(display); |
| shell.setText("OpenGL in SWT"); |
| shell.setLayout(new FillLayout()); |
| final Canvas canvas = new Canvas(shell, SWT.NO_BACKGROUND); |
| canvas.addControlListener(new ControlAdapter() { |
| public void controlResized(ControlEvent e) { |
| resize(canvas); |
| } |
| }); |
| final GLContext context = init(canvas); |
| shell.addDisposeListener(new DisposeListener() { |
| public void widgetDisposed(DisposeEvent e) { |
| context.dispose(); |
| } |
| }); |
| new Runnable() { |
| public void run() { |
| if (canvas.isDisposed()) return; |
| render(); |
| context.swapBuffers(); |
| canvas.getDisplay().timerExec(50, this); |
| } |
| }.run(); |
| shell.open(); |
| while (!shell.isDisposed()) { |
| if (!display.readAndDispatch()) display.sleep(); |
| } |
| display.dispose(); |
| } |
| |
| static GLContext init(Canvas canvas) { |
| GLContext context = new GLContext(canvas); |
| context.setCurrent(); |
| resize(canvas); |
| GL.glClearColor(1.0f, 1.0f, 1.0f, 1.0f); |
| GL.glColor3f(0.0f, 0.0f, 0.0f); |
| GL.glClearDepth(1.0f); |
| GL.glEnable(GL.GL_DEPTH_TEST); |
| GL.glHint(GL.GL_PERSPECTIVE_CORRECTION_HINT, GL.GL_NICEST); |
| return context; |
| } |
| |
| static void render() { |
| GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT); |
| GL.glLoadIdentity(); |
| GL.glTranslatef(0.0f, 0.0f, -6.0f); |
| GL.glBegin(GL.GL_QUADS); |
| GL.glVertex3f(-1.0f, 1.0f, 0.0f); |
| GL.glVertex3f(1.0f, 1.0f, 0.0f); |
| GL.glVertex3f(1.0f, -1.0f, 0.0f); |
| GL.glVertex3f(-1.0f, -1.0f, 0.0f); |
| GL.glEnd(); |
| } |
| |
| static void resize(Canvas canvas) { |
| Rectangle rect = canvas.getClientArea(); |
| int width = rect.width; |
| int height = Math.max(rect.height, 1); |
| GL.glViewport(0, 0, width, height); |
| GL.glMatrixMode(GL.GL_PROJECTION); |
| GL.glLoadIdentity(); |
| float aspect = (float) width / (float) height; |
| GLU.gluPerspective(45.0f, aspect, 0.5f, 400.0f); |
| GL.glMatrixMode(GL.GL_MODELVIEW); |
| GL.glLoadIdentity(); |
| } |
| } |