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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;
import com.jogamp.common.os.Platform;
import com.jogamp.opengl.math.FloatUtil;
public class Frustum {
protected Plane[] planes = new Plane[6];
protected float[] pmv;
public Frustum(float[] pmv) {
this.pmv = pmv;
for (int i = 0; i < 6; ++i) {
planes[i] = new Plane();
}
}
public void setMatrix(float[] pmv) {
this.pmv = pmv;
}
public final Plane[] getPlanes() { return planes; }
public final float[] getPMV() { return pmv; }
public class Plane {
public final float[] n = new float[3];
public float d;
public final float distanceTo(float x, float y, float z) {
return (n[0] * x) + (n[1] * y) + (n[2] * z) + d;
}
@Override
public String toString() {
return "Plane[ [ " + n[0] + ", " + n[1] + ", " + n[2] + " ], " + d + "]";
}
}
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 inside the frustum
*/
public final boolean isInside(AABBox box) {
for (int i = 0; i < 6; ++i) {
if (!quickClassify(planes[i], box))
return false;
}
// We make no attempt to determine whether it's fully inside or not.
return true;
}
public void compute() {
// Left: [30+00, 31+01, 32+02, 33+03]
// comboMatrix.m[12] + comboMatrix.m[0];
planes[0].n[0] = pmv[12] + pmv[0];
planes[0].n[1] = pmv[13] + pmv[1];
planes[0].n[2] = pmv[14] + pmv[2];
planes[0].d = pmv[15] + pmv[3];
// Right: [30-00, 31-01, 32-02, 33-03]
planes[1].n[0] = pmv[12] - pmv[0];
planes[1].n[1] = pmv[13] - pmv[1];
planes[1].n[2] = pmv[14] - pmv[2];
planes[1].d = pmv[15] - pmv[3];
// Bottom: [30+10, 31+11, 32+12, 33+13]
planes[2].n[0] = pmv[12] + pmv[4];
planes[2].n[1] = pmv[13] + pmv[5];
planes[2].n[2] = pmv[14] + pmv[6];
planes[2].d = pmv[15] + pmv[7];
// Top: [30-10, 31-11, 32-12, 33-13]
planes[3].n[0] = pmv[12] - pmv[4];
planes[3].n[1] = pmv[13] - pmv[5];
planes[3].n[2] = pmv[14] - pmv[6];
planes[3].d = pmv[15] - pmv[7];
// Far: [30-20, 31-21, 32-22, 33-23]
planes[5].n[0] = pmv[12] - pmv[8];
planes[5].n[1] = pmv[13] - pmv[9];
planes[5].n[2] = pmv[14] - pmv[10];
planes[5].d = pmv[15] - pmv[11];
// Near: [30+20, 31+21, 32+22, 33+23]
planes[4].n[0] = pmv[12] + pmv[8];
planes[4].n[1] = pmv[13] + pmv[9];
planes[4].n[2] = pmv[14] + pmv[10];
planes[4].d = pmv[15] + pmv[11];
for (int i = 0; i < 6; ++i) {
final float[] p_n = planes[i].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;
planes[i].d *= invl;
}
}
public StringBuilder toString(StringBuilder sb) {
if( null == sb ) {
sb = new StringBuilder();
}
sb.append("Frustum[ P*MV[").append(Platform.NEWLINE);
FloatUtil.matrixToString(sb, "p*mv", null, pmv, 0, 4, 4, false);
sb.append("], 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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