Add an LWJGL example.

1 files changed, 130 insertions, 0 deletions

diff --git a/examples/org.eclipse.swt.opengl.examples/src/org/eclipse/swt/opengl/examples/LWJGLExample.java b/examples/org.eclipse.swt.opengl.examples/src/org/eclipse/swt/opengl/examples/LWJGLExample.java
new file mode 100644
index 0000000000..11d1c2073b
--- /dev/null
+++ b/examples/org.eclipse.swt.opengl.examples/src/org/eclipse/swt/opengl/examples/LWJGLExample.java
@@ -0,0 +1,130 @@
+/*******************************************************************************
+ * 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:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.swt.opengl.examples;
+
+import org.eclipse.swt.*;
+import org.eclipse.swt.layout.*;
+import org.eclipse.swt.widgets.*;
+import org.eclipse.swt.graphics.*;
+import org.eclipse.swt.opengl.GLCanvas;
+import org.eclipse.swt.opengl.GLData;
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GLContext;
+import org.lwjgl.opengl.glu.GLU;
+import org.lwjgl.LWJGLException;
+
+/*
+ * SWT OpenGL snippet: use LWJGL to draw to an SWT GLCanvas
+ */
+public class LWJGLExample {
+	static void drawTorus(float r, float R, int nsides, int rings) {
+		float ringDelta = 2.0f * (float) Math.PI / rings;
+		float sideDelta = 2.0f * (float) Math.PI / nsides;
+		float theta = 0.0f, cosTheta = 1.0f, sinTheta = 0.0f;
+		for (int i = rings - 1; i >= 0; i--) {
+			float theta1 = theta + ringDelta;
+			float cosTheta1 = (float) Math.cos(theta1);
+			float sinTheta1 = (float) Math.sin(theta1);
+			GL11.glBegin(GL11.GL_QUAD_STRIP);
+			float phi = 0.0f;
+			for (int j = nsides; j >= 0; j--) {
+				phi += sideDelta;
+				float cosPhi = (float) Math.cos(phi);
+				float sinPhi = (float) Math.sin(phi);
+				float dist = R + r * cosPhi;
+				GL11.glNormal3f(cosTheta1 * cosPhi, -sinTheta1 * cosPhi, sinPhi);
+				GL11.glVertex3f(cosTheta1 * dist, -sinTheta1 * dist, r * sinPhi);
+				GL11.glNormal3f(cosTheta * cosPhi, -sinTheta * cosPhi, sinPhi);
+				GL11.glVertex3f(cosTheta * dist, -sinTheta * dist, r * sinPhi);
+			}
+			GL11.glEnd();
+			theta = theta1;
+			cosTheta = cosTheta1;
+			sinTheta = sinTheta1;
+		}
+	}
+
+	public static void main(String [] args) {
+		final Display display = new Display();
+		Shell shell = new Shell(display);
+		shell.setLayout(new FillLayout());
+		Composite comp = new Composite(shell, SWT.NONE);
+		comp.setLayout(new FillLayout());
+		GLData data = new GLData ();
+		data.doubleBuffer = true;
+		final GLCanvas canvas = new GLCanvas(comp, SWT.NONE, data);
+
+		canvas.setCurrent();
+		try {
+       		GLContext.useContext(canvas);
+        } catch(LWJGLException e) { e.printStackTrace(); }
+        
+        canvas.addListener(SWT.Resize, new Listener() {
+        	public void handleEvent(Event event) {
+        		Rectangle bounds = canvas.getBounds();
+        		float fAspect = (float) bounds.width / (float) bounds.height;
+				canvas.setCurrent();
+				try {
+					GLContext.useContext(canvas);
+		        } catch(LWJGLException e) { e.printStackTrace(); }
+        		GL11.glViewport(0, 0, bounds.width, bounds.height);
+        		GL11.glMatrixMode(GL11.GL_PROJECTION);
+        		GL11.glLoadIdentity();
+        		GLU.gluPerspective(45.0f, fAspect, 0.5f, 400.0f);
+        		GL11.glMatrixMode(GL11.GL_MODELVIEW);
+        		GL11.glLoadIdentity();
+        	}
+        });
+
+		GL11.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
+		GL11.glColor3f(1.0f, 0.0f, 0.0f);
+		GL11.glHint(GL11.GL_PERSPECTIVE_CORRECTION_HINT, GL11.GL_NICEST);
+		GL11.glClearDepth(1.0);
+		GL11.glLineWidth(2);
+		GL11.glEnable(GL11.GL_DEPTH_TEST);
+
+		shell.setText("SWT/LWJGL Example");
+		shell.setSize(640, 480);
+		shell.open();
+
+	    display.asyncExec(new Runnable() {
+	    	int rot = 0;
+			public void run() {
+				if (!canvas.isDisposed()) {
+					canvas.setCurrent();
+					try {
+						GLContext.useContext(canvas);
+			        } catch(LWJGLException e) { e.printStackTrace(); }
+					GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
+					GL11.glClearColor(.3f, .5f, .8f, 1.0f);
+					GL11.glLoadIdentity();
+					GL11.glTranslatef(0.0f, 0.0f, -10.0f);
+					float frot = rot;
+					GL11.glRotatef(0.15f * rot, 2.0f * frot, 10.0f * frot, 1.0f);
+					GL11.glRotatef(0.3f * rot, 3.0f * frot, 1.0f * frot, 1.0f);
+					rot++;
+					GL11.glPolygonMode(GL11.GL_FRONT_AND_BACK, GL11.GL_LINE);
+					GL11.glColor3f(0.9f, 0.9f, 0.9f);
+					drawTorus(1, 1.9f + ((float) Math.sin((0.004f * frot))), 15, 15);
+					canvas.swapBuffers();
+					display.asyncExec(this);
+				}
+			}
+		});
+
+		while(!shell.isDisposed()) {
+			if (!display.readAndDispatch()) {
+				display.sleep();
+			}
+		}
+		display.dispose();
+	}
+}