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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.opengl.examples;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.opengl.*;
abstract class SelectionTab extends OpenGLTab {
private final static int BUFFER_LENGTH = 64;
/**
* Sets the selected object. Subclasses must override this method.
*/
abstract void processPick(int[] pSelectBuff, int hits);
/**
* Invoke processPick for the object at the specified coordinate.
*/
int processSelection(int xPos, int yPos, int pointSize) {
int[] selectBuffer = new int[BUFFER_LENGTH];
int[] viewport = new int[4];
// new fix for sun jre
int ptr = getContext().getSelectBufferPtr(selectBuffer);
GL.glSelectBuffer(BUFFER_LENGTH, ptr);
GL.glGetIntegerv(GL.GL_VIEWPORT, viewport);
GL.glRenderMode(GL.GL_SELECT);
GL.glMatrixMode(GL.GL_PROJECTION);
GL.glPushMatrix();
GL.glLoadIdentity();
GLU.gluPickMatrix(xPos, yPos, pointSize, pointSize, viewport);
Rectangle rect = getGlCanvas().getClientArea();
float fAspect = (float) rect.width / (float) rect.height;
GLU.gluPerspective(45.0f, fAspect, 0.5f, 600.0f);
GL.glMatrixMode(GL.GL_MODELVIEW);
GL.glInitNames();
render();
int hits = GL.glRenderMode(GL.GL_RENDER);
// new fix for sun jre
// must be called after render mode is switched
getContext().getSelectBuffer(ptr, selectBuffer);
if (hits != 0) processPick(selectBuffer, hits);
GL.glMatrixMode(GL.GL_PROJECTION);
GL.glPopMatrix();
GL.glMatrixMode(GL.GL_MODELVIEW);
return hits;
}
}
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