SWT OpenGL snippet: draw a square
/*******************************************************************************
* 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();
}
}
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