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package com.jogamp.opengl.util;
import java.nio.FloatBuffer;
// import org.openmali.spatial.bodies.Box;
// import org.openmali.spatial.bodies.Classifier;
// import org.openmali.vecmath2.Matrix4f;
public class Frustum2 {
protected Plane[] planes = new Plane[6];
protected PMVMatrix pmvMatrix;
protected FloatBuffer pmv = FloatBuffer.allocate(16);
protected int pmvOffset;
public Frustum2(PMVMatrix matrix) {
setMatrix(matrix);
for (int i = 0; i < 6; ++i) {
planes[i] = new Plane();
}
}
public void setMatrix(PMVMatrix matrix) {
this.pmvMatrix = matrix;
// pmv = pmvMatrix.glGetPMvMatrixf();
// pmvOffset = pmv.position();
makePmvMatrix();
}
protected Matrix4f proj;
protected Matrix4f modl;
private FloatBuffer b;
private int bOffset;
private float f(int offset) {
return b.get(bOffset + offset);
}
private Matrix4f getMatrix4f(FloatBuffer b) {
this.b = b;
bOffset = b.position();
return new Matrix4f(f(0), f(1), f(2), f(3), f(4), f(5), f(6)/* 12 */, f(7), f(8), f(9), f(10), f(11), f(12),
f(13), f(14), f(15));
}
public void makePmvMatrix() {
getMatrix4f(pmvMatrix.glGetMvMatrixf()).mul(getMatrix4f(pmvMatrix.glGetPMatrixf())).writeToBuffer(pmv, true,
false);
}
protected class Vector3f {
public float x;
public float y;
public float z;
@Override
public String toString() {
return "{" + x + "," + y + "," + z + "}";
}
}
protected class Plane {
public Vector3f n = new Vector3f();
public float d;
public final float distanceTo(float x, float y, float z) {
return (n.x * x) + (n.y * y) + (n.z * z) + d;
}
@Override
public String toString() {
return "Plane[" + n + ", " + d + "]";
}
}
protected float[] getMatrixFloat(FloatBuffer b) {
if (pmvMatrix.usesBackingArray()) {
return b.array();
} else {
int p = b.position();
float[] pm = new float[16];
b.get(pm, p, 16);
b.position(p);
return pm;
}
}
protected float m(int a) {
return pmv.get(a);
}
private static final boolean quickClassify(Plane p, Box box) {
if (p.distanceTo(box.getLowerX(), box.getLowerY(), box.getLowerZ()) > 0.0f)
return (true);
if (p.distanceTo(box.getUpperX(), box.getLowerY(), box.getLowerZ()) > 0.0f)
return (true);
if (p.distanceTo(box.getLowerX(), box.getUpperY(), box.getLowerZ()) > 0.0f)
return (true);
if (p.distanceTo(box.getUpperX(), box.getUpperY(), box.getLowerZ()) > 0.0f)
return (true);
if (p.distanceTo(box.getLowerX(), box.getLowerY(), box.getUpperZ()) > 0.0f)
return (true);
if (p.distanceTo(box.getUpperX(), box.getLowerY(), box.getUpperZ()) > 0.0f)
return (true);
if (p.distanceTo(box.getLowerX(), box.getUpperY(), box.getUpperZ()) > 0.0f)
return (true);
if (p.distanceTo(box.getUpperX(), box.getUpperY(), box.getUpperZ()) > 0.0f)
return (true);
return (false);
}
/**
* Quick check to see if an orthogonal bounding box is inside the frustum
*/
public final Classifier.Classification quickClassify(Box box) {
for (int i = 0; i < 6; ++i) {
if (!quickClassify(planes[i], box))
return (Classifier.Classification.OUTSIDE);
}
// We make no attempt to determine whether it's fully inside or not.
return (Classifier.Classification.SPANNING);
}
protected float[] mat = new float[16];
public void compute() {
// Left: [30+00, 31+01, 32+02, 33+03]
// comboMatrix.m[12] + comboMatrix.m[0];
planes[0].n.x = m(12) + m(0);
planes[0].n.y = m(13) + m(1);
planes[0].n.z = m(14) + m(2);
planes[0].d = m(15) + m(3);
// Right: [30-00, 31-01, 32-02, 33-03]
planes[1].n.x = m(12) - m(0);
planes[1].n.y = m(13) - m(1);
planes[1].n.z = m(14) - m(2);
planes[1].d = m(15) - m(3);
// Bottom: [30+10, 31+11, 32+12, 33+13]
planes[2].n.x = m(12) + m(4);
planes[2].n.y = m(13) + m(5);
planes[2].n.z = m(14) + m(6);
planes[2].d = m(15) + m(7);
// Top: [30-10, 31-11, 32-12, 33-13]
planes[3].n.x = m(12) - m(4);
planes[3].n.y = m(13) - m(5);
planes[3].n.z = m(14) - m(6);
planes[3].d = m(15) - m(7);
// Far: [30-20, 31-21, 32-22, 33-23]
planes[5].n.x = m(12) - m(8);
planes[5].n.y = m(13) - m(9);
planes[5].n.z = m(14) - m(10);
planes[5].d = m(15) - m(11);
// Near: [30+20, 31+21, 32+22, 33+23]
planes[4].n.x = m(12) + m(8);
planes[4].n.y = m(13) + m(9);
planes[4].n.z = m(14) + m(10);
planes[4].d = m(15) + m(11);
for (int i = 0; i < 6; ++i) {
double invl = Math.sqrt(planes[i].n.x * planes[i].n.x + planes[i].n.y * planes[i].n.y + planes[i].n.z
* planes[i].n.z);
planes[i].n.x *= invl;
planes[i].n.y *= invl;
planes[i].n.z *= invl;
planes[i].d *= invl;
}
}
@Override
public String toString() {
return "m[" + m(0) + "|" + m(1) + "|" + m(2) + "|" + m(3) + "|" + m(4) + "|" + m(5) + "|" + m(6) + "|" + m(7)
+ "|" + m(8) + "|" + m(9) + "|" + m(10) + "|" + m(11) + "|" + m(12) + "|" + m(13) + "|" + m(14) + "|"
+ m(15) + "]" + "Frustum2[" + planes[0] + ", " + planes[1] + ", " + planes[2] + ", " + planes[3] + ", "
+ planes[4] + ", " + planes[5] + "]";
}
}
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