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/*
* Copyright (C) 2012 United States Government as represented by the Administrator of the
* National Aeronautics and Space Administration.
* All Rights Reserved.
*/
package gov.nasa.worldwind;
import gov.nasa.worldwind.avlist.AVKey;
import gov.nasa.worldwind.geom.Angle;
import gov.nasa.worldwind.render.DrawContext;
import javax.media.opengl.*;
/**
* TODO: This file needs to be updated to implement "correct" stereo, as described at:
* http://www.orthostereo.com/geometryopengl.html
*
*
* This scene controller draws in stereo, either red-blue anaglyph or device supported if the display device provides
* stereo directly. It can also draw without applying stereo. To select stereo, prior to calling this class' constructor
* set the Java VM property gov.nasa.worldwind.stereo.mode to "device" for device supported stereo (if
* provided by the device) or "redblue" for red-blue anaglyph stereo. If the property is not set or is any other value,
* this class does not draw in stereo.
*
* The {@link WorldWindow} instance must support stereo in order to use device-supported stereo. A stereo
* WorldWindow is selected by specifying the Java VM property described above prior to creating it. See
* {@link gov.nasa.worldwind.awt.WorldWindowGLCanvas} for further details.
*
* Note: The logic and much of the code here was contributed by Xander Enzmann of Mitre Corporation.
*
* @author tag
* @version $Id: StereoOptionSceneController.java 1171 2013-02-11 21:45:02Z dcollins $
*/
public class StereoOptionSceneController extends BasicSceneController implements StereoSceneController
{
/**
* The default focus angle. May be specified in the World Wind configuration file as the
* gov.nasa.worldwind.StereoFocusAngle property. The default if not specified in the configuration is
* 1.6 degrees.
*/
protected static final double DEFAULT_FOCUS_ANGLE = Configuration.getDoubleValue(AVKey.STEREO_FOCUS_ANGLE, 1.6);
/** The current stereo mode. May not be set to null; use {@link AVKey#STEREO_MODE_NONE} instead. */
protected String stereoMode = AVKey.STEREO_MODE_NONE;
/** The angle between eyes. Larger angles give increased 3D effect. */
protected Angle focusAngle = Angle.fromDegrees(DEFAULT_FOCUS_ANGLE);
/** Indicates whether left and right eye positions are swapped. */
protected boolean swapEyes = false;
/** Indicates the GL drawable capabilities. Non-null only after this scene controller draws once. */
protected GLCapabilitiesImmutable capabilities;
/** Indicates whether hardware device stereo is available. Valid only after this scene controller draws once. */
protected boolean hardwareStereo = false;
/**
* Indicates whether stereo is being applied, either because a stereo device is being used or a stereo mode is in
* effect. This field is included because the question is asked every frame, and tracking the answer via a boolean
* avoids the overhead of more complicated logic that determines the stereo-drawing implementation to call.
*/
protected boolean inStereo = false;
/** Constructs an instance and initializes its stereo mode to */
public StereoOptionSceneController()
{
String stereo = System.getProperty(AVKey.STEREO_MODE);
if ("redblue".equalsIgnoreCase(stereo))
this.setStereoMode(AVKey.STEREO_MODE_RED_BLUE);
else if ("device".equalsIgnoreCase(stereo))
this.setStereoMode(AVKey.STEREO_MODE_DEVICE);
}
public void setStereoMode(String mode)
{
this.stereoMode = mode != null ? mode : AVKey.STEREO_MODE_NONE;
// If device-implemented stereo is used, stereo is considered always in effect no matter what the stereo mode.
this.inStereo = this.isHardwareStereo() || AVKey.STEREO_MODE_RED_BLUE.equals(this.stereoMode);
}
public String getStereoMode()
{
return this.stereoMode;
}
/**
* {@inheritDoc} The default focus angle is 1.6 degrees.
*
* @param a the left-right eye direction difference. If null, the angle is set to 0.
*/
public void setFocusAngle(Angle a)
{
this.focusAngle = a != null ? a : Angle.ZERO;
}
public Angle getFocusAngle()
{
return this.focusAngle;
}
public void setSwapEyes(boolean swapEyes)
{
this.swapEyes = swapEyes;
}
public boolean isSwapEyes()
{
return this.swapEyes;
}
public boolean isHardwareStereo()
{
return this.hardwareStereo;
}
/**
* {@inheritDoc}
*
* If the display device is providing stereo -- {@link #isHardwareStereo()} is true -- this method
* returns true even if the stereo mode is {@link AVKey#STEREO_MODE_NONE}. In this case, individual stereo images
* are drawn for left and right eyes in order to prevent a blurred scene.
*/
public boolean isInStereo()
{
return this.inStereo;
}
@Override
protected void draw(DrawContext dc)
{
// Capture the capabilities actually in use.
if (this.capabilities == null)
{
this.capabilities = dc.getGLContext().getGLDrawable().getChosenGLCapabilities();
this.hardwareStereo = this.capabilities.getStereo();
this.inStereo = this.isHardwareStereo() ? true : this.isInStereo();
}
// If stereo isn't to be applied, just draw and return.
if (!isInStereo())
{
super.draw(dc);
return;
}
// Check if pitch is in correct range (50 - 90 degrees) for current stereo implementation to
// work correctly (temporary hack)
View dcView = dc.getView();
Boolean pitchInRange = (dcView.getPitch().compareTo(Angle.fromDegrees(50)) > 0
&& dcView.getPitch().compareTo(Angle.POS90) < 0);
if (AVKey.STEREO_MODE_DEVICE.equals(this.stereoMode) && this.isHardwareStereo() && pitchInRange)
this.doDrawToStereoDevice(dc);
else if (AVKey.STEREO_MODE_RED_BLUE.equals(this.stereoMode) && pitchInRange)
this.doDrawStereoRedBlue(dc);
else // AVKey.STEREO_MODE_NONE
this.doDrawStereoNone(dc);
}
/**
* Implement no stereo ("Mono") while using a stereo device.
*
* Note that this method draws the image twice, once to each of the left and right eye buffers, even when stereo is
* not in effect. This is to prevent the stereo device from drawing blurred scenes.
*
* @param dc the current draw context.
*/
protected void doDrawStereoNone(DrawContext dc)
{
// If running on a stereo device but want to draw a normal image, both buffers must be filled or the
// display will be blurry.
GL2 gl = dc.getGL().getGL2(); // GL initialization checks for GL2 compatibility.
gl.glDrawBuffer(GL2.GL_BACK_LEFT);
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
super.draw(dc);
gl.glDrawBuffer(GL2.GL_BACK_RIGHT);
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
super.draw(dc);
}
/**
* Implement stereo using the red-blue anaglyph technique.
*
* @param dc the current draw context.
*/
protected void doDrawStereoRedBlue(DrawContext dc)
{
GL2 gl = dc.getGL().getGL2(); // GL initialization checks for GL2 compatibility.
View dcView = dc.getView();
// Draw the left eye
if (this.isSwapEyes())
{
if (this.isHardwareStereo())
gl.glDrawBuffer(GL2.GL_BACK_RIGHT);
gl.glColorMask(false, true, true, true); // right eye in green/blue
}
else
{
if (this.isHardwareStereo())
gl.glDrawBuffer(GL2.GL_BACK_LEFT);
gl.glColorMask(true, false, false, true); // left eye in red only
}
if (this.isHardwareStereo())
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
super.draw(dc);
// Move the view to the right eye
Angle viewHeading = dcView.getHeading();
dcView.setHeading(dcView.getHeading().subtract(this.getFocusAngle()));
dcView.apply(dc);
// Draw the right eye frame green and blue only
try
{
gl.glClear(GL.GL_DEPTH_BUFFER_BIT);
if (this.isSwapEyes())
{
if (this.isHardwareStereo())
gl.glDrawBuffer(GL2.GL_BACK_RIGHT);
gl.glColorMask(true, false, false, true); // right eye in red only
}
else
{
if (this.isHardwareStereo())
gl.glDrawBuffer(GL2.GL_BACK_LEFT);
gl.glColorMask(false, true, true, true); // right eye in green/blue
}
if (this.isHardwareStereo())
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
super.draw(dc);
}
finally
{
// Restore the original view heading
dcView.setHeading(viewHeading);
dcView.apply(dc);
gl.glColorMask(true, true, true, true);
}
}
/**
* Implement stereo using the stereo-enabled graphics device. The mode has an effect only if the display device
* implements stereo.
*
* @param dc the current draw context.
*/
protected void doDrawToStereoDevice(DrawContext dc)
{
GL2 gl = dc.getGL().getGL2(); // GL initialization checks for GL2 compatibility.
View dcView = dc.getView();
// Draw the left eye
if (this.isSwapEyes())
gl.glDrawBuffer(GL2.GL_BACK_RIGHT);
else
gl.glDrawBuffer(GL2.GL_BACK_LEFT);
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
super.draw(dc);
// Move the view to the right eye
Angle viewHeading = dcView.getHeading();
dcView.setHeading(dcView.getHeading().subtract(this.getFocusAngle()));
dcView.apply(dc);
// Draw the right eye
try
{
if (this.isSwapEyes())
gl.glDrawBuffer(GL2.GL_BACK_LEFT);
else
gl.glDrawBuffer(GL2.GL_BACK_RIGHT);
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
super.draw(dc);
}
finally
{
// Restore the original view heading
dcView.setHeading(viewHeading);
dcView.apply(dc);
}
}
}
