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/**
* Copyright 2010 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 com.jogamp.opengl.math.geom;
/**
* Derived Frustum of premultiplied projection * modelview matrix
* exposing {@link #isOutside(AABBox)} test and the {@link #getPlanes() planes} itself.
*/
public class Frustum {
protected Plane[] planes = new Plane[6];
/**
* Creates an undefined instance w/o calculating the frustum.
*/
public Frustum() {
for (int i = 0; i < 6; ++i) {
planes[i] = new Plane();
}
}
/**
* Creates a defined instance w/ calculating the frustum
* using the passed float[16] as premultiplied MV*P (column major order)
*/
public Frustum(float[] mvp, int pmv_off) {
for (int i = 0; i < 6; ++i) {
planes[i] = new Plane();
}
update(mvp, pmv_off);
}
public static class Plane {
/** Normal of the plane */
public final float[] n = new float[3];
/** Distance to origin */
public float d;
/** Return distance of plane to given point */
public final float distanceTo(float x, float y, float z) {
return (n[0] * x) + (n[1] * y) + (n[2] * z) + d;
}
/** Return distance of plane to given point */
public final float distanceTo(float[] p) {
return (n[0] * p[0]) + (n[1] * p[1]) + (n[2] * p[2]) + d;
}
@Override
public String toString() {
return "Plane[ " + n + ", " + d + "]";
}
}
public final Plane[] getPlanes() { return planes; }
/**
* Re-calculate the frustum
* using the passed float[16] as premultiplied MV*P (column major order).
*/
public void update(float[] mvp, int mvp_off) {
// Left: [30+00, 31+01, 32+02, 33+03]
// comboMatrix.m[12] + comboMatrix.m[0];
{
final Plane p = planes[0];
final float[] p_n = p.n;
p_n[0] = mvp[ mvp_off + 12 ] + mvp[ mvp_off + 0 ];
p_n[1] = mvp[ mvp_off + 13 ] + mvp[ mvp_off + 1 ];
p_n[2] = mvp[ mvp_off + 14 ] + mvp[ mvp_off + 2 ];
p.d = mvp[ mvp_off + 15 ] + mvp[ mvp_off + 3 ];
}
// Right: [30-00, 31-01, 32-02, 33-03]
{
final Plane p = planes[1];
final float[] p_n = p.n;
p_n[0] = mvp[ mvp_off + 12 ] - mvp[ mvp_off + 0 ];
p_n[1] = mvp[ mvp_off + 13 ] - mvp[ mvp_off + 1 ];
p_n[2] = mvp[ mvp_off + 14 ] - mvp[ mvp_off + 2 ];
p.d = mvp[ mvp_off + 15 ] - mvp[ mvp_off + 3 ];
}
// Bottom: [30+10, 31+11, 32+12, 33+13]
{
final Plane p = planes[2];
final float[] p_n = p.n;
p_n[0] = mvp[ mvp_off + 12 ] + mvp[ mvp_off + 4 ];
p_n[1] = mvp[ mvp_off + 13 ] + mvp[ mvp_off + 5 ];
p_n[2] = mvp[ mvp_off + 14 ] + mvp[ mvp_off + 6 ];
p.d = mvp[ mvp_off + 15 ] + mvp[ mvp_off + 7 ];
}
// Top: [30-10, 31-11, 32-12, 33-13]
{
final Plane p = planes[3];
final float[] p_n = p.n;
p_n[0] = mvp[ mvp_off + 12 ] - mvp[ mvp_off + 4 ];
p_n[1] = mvp[ mvp_off + 13 ] - mvp[ mvp_off + 5 ];
p_n[2] = mvp[ mvp_off + 14 ] - mvp[ mvp_off + 6 ];
p.d = mvp[ mvp_off + 15 ] - mvp[ mvp_off + 7 ];
}
// Near: [30+20, 31+21, 32+22, 33+23]
{
final Plane p = planes[4];
final float[] p_n = p.n;
p_n[0] = mvp[ mvp_off + 12 ] + mvp[ mvp_off + 8 ];
p_n[1] = mvp[ mvp_off + 13 ] + mvp[ mvp_off + 9 ];
p_n[2] = mvp[ mvp_off + 14 ] + mvp[ mvp_off + 10 ];
p.d = mvp[ mvp_off + 15 ] + mvp[ mvp_off + 11 ];
}
// Far: [30-20, 31-21, 32-22, 33-23]
{
final Plane p = planes[5];
final float[] p_n = p.n;
p_n[0] = mvp[ mvp_off + 12 ] - mvp[ mvp_off + 8 ];
p_n[1] = mvp[ mvp_off + 13 ] - mvp[ mvp_off + 9 ];
p_n[2] = mvp[ mvp_off + 14 ] - mvp[ mvp_off + 10 ];
p.d = mvp[ mvp_off + 15 ] - mvp[ mvp_off + 11 ];
}
for (int i = 0; i < 6; ++i) {
final Plane p = planes[i];
final float[] p_n = p.n;
final double invl = Math.sqrt(p_n[0] * p_n[0] + p_n[1] * p_n[1] + p_n[2] * p_n[2]);
p_n[0] *= invl;
p_n[1] *= invl;
p_n[2] *= invl;
p.d *= invl;
}
}
private static final boolean quickClassify(Plane p, AABBox box) {
final float[] low = box.getLow();
final float[] high = box.getHigh();
if (p.distanceTo(low[0], low[1], low[2]) > 0.0f)
return true;
if (p.distanceTo(high[0], low[1], low[2]) > 0.0f)
return true;
if (p.distanceTo(low[0], high[1], low[2]) > 0.0f)
return true;
if (p.distanceTo(high[0], high[1], low[2]) > 0.0f)
return true;
if (p.distanceTo(low[0], low[1], high[2]) > 0.0f)
return true;
if (p.distanceTo(high[0], low[1], high[2]) > 0.0f)
return true;
if (p.distanceTo(low[0], high[1], high[2]) > 0.0f)
return true;
if (p.distanceTo(high[0], high[1], high[2]) > 0.0f)
return true;
return false;
}
/**
* Quick check to see if an orthogonal bounding box is completly outside of the frustum.
* <p>
* Note: If method returns false, the box may be only partially inside.
* </p>
*/
public final boolean isOutside(AABBox box) {
for (int i = 0; i < 6; ++i) {
if (!quickClassify(planes[i], box)) {
// fully outside
return true;
}
}
// We make no attempt to determine whether it's fully inside or not.
return false;
}
public StringBuilder toString(StringBuilder sb) {
if( null == sb ) {
sb = new StringBuilder();
}
sb.append("Frustum[ Planes[ ").append(planes[0]).append(", ");
sb.append(planes[1]).append(", ").append(planes[2]).append(", ").append(planes[3]).append(", ").append(planes[4]).append(", ");
sb.append(planes[5]).append(" ] ]");
return sb;
}
@Override
public String toString() {
return toString(null).toString();
}
}
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