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/**
* Copyright 2014 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions 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.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package jogamp.opengl.util.stereo;
import javax.media.nativewindow.util.DimensionImmutable;
import javax.media.nativewindow.util.RectangleImmutable;
import com.jogamp.opengl.math.FovHVHalves;
import com.jogamp.opengl.math.VectorUtil;
/**
* 2D scale and offset NDC class,
* providing conversion from {@link FovHVHalves} in tangent to NDC space.
* <p>
* See <a href="https://www.opengl.org/wiki/Compute_eye_space_from_window_space">OpenGL.org: Compute eye space from window space</a>
* </p>
*/
public final class ScaleAndOffset2D {
/** Scale for x- and y-component. */
final float[] scale;
/** Offset for x- and y-component. */
final float[] offset;
private static final float[] vec2Half = new float[] { 0.5f, 0.5f };
public String toString() {
return "[offset "+offset[0]+" / "+offset[1]+", scale "+scale[0]+" x "+scale[1]+"]";
}
public ScaleAndOffset2D(final float[] scale, final float[] offset) {
this.scale = scale;
this.offset = offset;
}
/**
* Create the <i>Normalized Device Coordinate Space</i> (NDC) [-1,+1] instance
* from the given <code>fovHVHalves</code>.
*/
public ScaleAndOffset2D(final FovHVHalves fovHVHalves) {
final FovHVHalves tanFovHVHalves = fovHVHalves.toTangents();
final float projXScale = 2.0f / ( tanFovHVHalves.left+ tanFovHVHalves.right);
final float projYScale = 2.0f / ( tanFovHVHalves.top + tanFovHVHalves.bottom );
final float projXOffset = ( tanFovHVHalves.left - tanFovHVHalves.right ) * projXScale * 0.5f;
final float projYOffset = ( tanFovHVHalves.top - tanFovHVHalves.bottom ) * projYScale * 0.5f;
this.scale = new float[] { projXScale, projYScale };
this.offset = new float[] { projXOffset, projYOffset };
}
/**
* Create the <i>Normalized Device Coordinate Space</i> (NDC) [-1,+1] instance
* from the given <code>fovHVHalves</code>, for the subsection of the <code>render-viewport</code> within the <code>rendertarget-size</code>.
*/
public ScaleAndOffset2D(final FovHVHalves fovHVHalves, final DimensionImmutable rendertargetSize, final RectangleImmutable renderViewport) {
final ScaleAndOffset2D eyeToSourceNDC = new ScaleAndOffset2D(fovHVHalves);
final float[] vec2Tmp1 = new float[2];
final float[] vec2Tmp2 = new float[2];
final float[] scale = VectorUtil.scaleVec2(vec2Tmp1, eyeToSourceNDC.scale, 0.5f);
final float[] offset = VectorUtil.addVec2(vec2Tmp2, VectorUtil.scaleVec2(vec2Tmp2, eyeToSourceNDC.offset, 0.5f), vec2Half);
final float[] scale2 = new float[] { (float)renderViewport.getWidth() / (float)rendertargetSize.getWidth(),
(float)renderViewport.getHeight() / (float)rendertargetSize.getHeight() };
final float[] offset2 = new float[] { (float)renderViewport.getX() / (float)rendertargetSize.getWidth(),
(float)renderViewport.getY() / (float)rendertargetSize.getHeight() };
VectorUtil.scaleVec2(scale, scale, scale2);
VectorUtil.addVec2(offset, VectorUtil.scaleVec2(offset, offset, scale2), offset2);
this.scale = scale;
this.offset = offset;
}
/**
* Return the <i>tangent FOV space</i> of this <i>eye to source NDC</i> instance.
*/
public final float[] convertToTanFovSpace(final float[] rendertargetNDC) {
final float[] vec2Tmp1 = new float[2];
return VectorUtil.divVec2(vec2Tmp1, VectorUtil.subVec2(vec2Tmp1, rendertargetNDC, this.offset), this.scale);
}
}
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