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/*
* Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
*/
package net.java.joglutils.msg.elements;
import java.nio.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import net.java.joglutils.msg.misc.*;
/** Represents the current set of coordinates, which are assembled to
draw geometry, and causes side-effects in OpenGL. */
public class GLCoordinateElement extends CoordinateElement {
// Boilerplate for concrete element subclasses
public Element newInstance() {
return new GLCoordinateElement();
}
public static GLCoordinateElement getInstance(State state) {
return (GLCoordinateElement) CoordinateElement.getInstance(state);
}
public static void enable(State defaultState) {
Element tmp = new GLCoordinateElement();
defaultState.setElement(tmp.getStateIndex(), tmp);
}
// Whether the OpenGL state is currently enabled
private boolean enabled;
public void push(State state) {
super.push(state);
// Copy enabled state from previous element if any
GLCoordinateElement prev = (GLCoordinateElement) getNextInStack();
if (prev != null) {
enabled = prev.enabled;
}
}
public void pop(State state, Element previousTopElement) {
GLCoordinateElement prev = (GLCoordinateElement) previousTopElement;
boolean shouldBeEnabled = enabled;
enabled = prev.enabled;
// Put things back the way they were
setEnabled(shouldBeEnabled);
}
public void setElt(FloatBuffer coords) {
super.setElt(coords);
setEnabled(coords != null);
}
private void setEnabled(boolean enabled) {
if (this.enabled == enabled)
return; // No OpenGL work to do
this.enabled = enabled;
GL2 gl = GLU.getCurrentGL().getGL2();
if (enabled) {
gl.glVertexPointer(3, GL2.GL_FLOAT, 0, coords);
gl.glEnableClientState(GL2.GL_VERTEX_ARRAY);
} else {
gl.glDisableClientState(GL2.GL_VERTEX_ARRAY);
}
}
}
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