/**
* 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);
}
}
/**
* Implement no stereo ("Mono") while using a stereo device.
*
* <p>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);
}
@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 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);
}
}
