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package net.tylermurphy.Minecraft.Render.Util;
import java.nio.FloatBuffer;
import org.lwjgl.BufferUtils;
import org.joml.Matrix4f;
import net.tylermurphy.Minecraft.Render.Util.FrustumCuller;
public class FrustumCuller {
public float[][] m_Frustum = new float[6][4];
public static final int RIGHT = 0;
public static final int LEFT = 1;
public static final int BOTTOM = 2;
public static final int TOP = 3;
public static final int BACK = 4;
public static final int FRONT = 5;
public static final int A = 0;
public static final int B = 1;
public static final int C = 2;
public static final int D = 3;
private static FrustumCuller frustum = new FrustumCuller();
private static FloatBuffer modlBuffer = BufferUtils.createFloatBuffer(16);
private static FloatBuffer projBuffer = BufferUtils.createFloatBuffer(16);
float[] proj = new float[16];
float[] modl = new float[16];
float[] clip = new float[16];
public static FrustumCuller getFrustum(Matrix4f viewMatrix, Matrix4f projectionMatrix) {
frustum.calculateFrustum(viewMatrix, projectionMatrix);
return frustum;
}
private void normalizePlane(float[][] frustum, int side) {
float magnitude = (float) Math.sqrt(frustum[side][0] * frustum[side][0] + frustum[side][1] * frustum[side][1] + frustum[side][2] * frustum[side][2]);
frustum[side][0] /= magnitude;
frustum[side][1] /= magnitude;
frustum[side][2] /= magnitude;
frustum[side][3] /= magnitude;
}
private void calculateFrustum(Matrix4f viewMatrix, Matrix4f projectionMatrix) {
modlBuffer.rewind();
viewMatrix.get(modlBuffer);
projBuffer.rewind();
projectionMatrix.get(projBuffer);
for(int i = 0; i < 16; i ++) {
modl[i] = modlBuffer.get(i);
proj[i] = projBuffer.get(i);
}
this.clip[0] = (this.modl[0] * this.proj[0] + this.modl[1] * this.proj[4] + this.modl[2] * this.proj[8] + this.modl[3] * this.proj[12]);
this.clip[1] = (this.modl[0] * this.proj[1] + this.modl[1] * this.proj[5] + this.modl[2] * this.proj[9] + this.modl[3] * this.proj[13]);
this.clip[2] = (this.modl[0] * this.proj[2] + this.modl[1] * this.proj[6] + this.modl[2] * this.proj[10] + this.modl[3] * this.proj[14]);
this.clip[3] = (this.modl[0] * this.proj[3] + this.modl[1] * this.proj[7] + this.modl[2] * this.proj[11] + this.modl[3] * this.proj[15]);
this.clip[4] = (this.modl[4] * this.proj[0] + this.modl[5] * this.proj[4] + this.modl[6] * this.proj[8] + this.modl[7] * this.proj[12]);
this.clip[5] = (this.modl[4] * this.proj[1] + this.modl[5] * this.proj[5] + this.modl[6] * this.proj[9] + this.modl[7] * this.proj[13]);
this.clip[6] = (this.modl[4] * this.proj[2] + this.modl[5] * this.proj[6] + this.modl[6] * this.proj[10] + this.modl[7] * this.proj[14]);
this.clip[7] = (this.modl[4] * this.proj[3] + this.modl[5] * this.proj[7] + this.modl[6] * this.proj[11] + this.modl[7] * this.proj[15]);
this.clip[8] = (this.modl[8] * this.proj[0] + this.modl[9] * this.proj[4] + this.modl[10] * this.proj[8] + this.modl[11] * this.proj[12]);
this.clip[9] = (this.modl[8] * this.proj[1] + this.modl[9] * this.proj[5] + this.modl[10] * this.proj[9] + this.modl[11] * this.proj[13]);
this.clip[10] = (this.modl[8] * this.proj[2] + this.modl[9] * this.proj[6] + this.modl[10] * this.proj[10] + this.modl[11] * this.proj[14]);
this.clip[11] = (this.modl[8] * this.proj[3] + this.modl[9] * this.proj[7] + this.modl[10] * this.proj[11] + this.modl[11] * this.proj[15]);
this.clip[12] = (this.modl[12] * this.proj[0] + this.modl[13] * this.proj[4] + this.modl[14] * this.proj[8] + this.modl[15] * this.proj[12]);
this.clip[13] = (this.modl[12] * this.proj[1] + this.modl[13] * this.proj[5] + this.modl[14] * this.proj[9] + this.modl[15] * this.proj[13]);
this.clip[14] = (this.modl[12] * this.proj[2] + this.modl[13] * this.proj[6] + this.modl[14] * this.proj[10] + this.modl[15] * this.proj[14]);
this.clip[15] = (this.modl[12] * this.proj[3] + this.modl[13] * this.proj[7] + this.modl[14] * this.proj[11] + this.modl[15] * this.proj[15]);
this.m_Frustum[0][0] = (this.clip[3] - this.clip[0]);
this.m_Frustum[0][1] = (this.clip[7] - this.clip[4]);
this.m_Frustum[0][2] = (this.clip[11] - this.clip[8]);
this.m_Frustum[0][3] = (this.clip[15] - this.clip[12]);
normalizePlane(this.m_Frustum, 0);
this.m_Frustum[1][0] = (this.clip[3] + this.clip[0]);
this.m_Frustum[1][1] = (this.clip[7] + this.clip[4]);
this.m_Frustum[1][2] = (this.clip[11] + this.clip[8]);
this.m_Frustum[1][3] = (this.clip[15] + this.clip[12]);
normalizePlane(this.m_Frustum, 1);
this.m_Frustum[2][0] = (this.clip[3] + this.clip[1]);
this.m_Frustum[2][1] = (this.clip[7] + this.clip[5]);
this.m_Frustum[2][2] = (this.clip[11] + this.clip[9]);
this.m_Frustum[2][3] = (this.clip[15] + this.clip[13]);
normalizePlane(this.m_Frustum, 2);
this.m_Frustum[3][0] = (this.clip[3] - this.clip[1]);
this.m_Frustum[3][1] = (this.clip[7] - this.clip[5]);
this.m_Frustum[3][2] = (this.clip[11] - this.clip[9]);
this.m_Frustum[3][3] = (this.clip[15] - this.clip[13]);
normalizePlane(this.m_Frustum, 3);
this.m_Frustum[4][0] = (this.clip[3] - this.clip[2]);
this.m_Frustum[4][1] = (this.clip[7] - this.clip[6]);
this.m_Frustum[4][2] = (this.clip[11] - this.clip[10]);
this.m_Frustum[4][3] = (this.clip[15] - this.clip[14]);
normalizePlane(this.m_Frustum, 4);
this.m_Frustum[5][0] = (this.clip[3] + this.clip[2]);
this.m_Frustum[5][1] = (this.clip[7] + this.clip[6]);
this.m_Frustum[5][2] = (this.clip[11] + this.clip[10]);
this.m_Frustum[5][3] = (this.clip[15] + this.clip[14]);
normalizePlane(this.m_Frustum, 5);
}
public boolean pointInFrustum(float x, float y, float z) {
for (int i = 0; i < 6; i++) {
if (this.m_Frustum[i][0] * x + this.m_Frustum[i][1] * y + this.m_Frustum[i][2] * z + this.m_Frustum[i][3] <= 0.0F) {
return false;
}
}
return true;
}
public boolean sphereInFrustum(float x, float y, float z, float radius) {
for (int i = 0; i < 6; i++) {
if (this.m_Frustum[i][0] * x + this.m_Frustum[i][1] * y + this.m_Frustum[i][2] * z + this.m_Frustum[i][3] <= -radius) {
return false;
}
}
return true;
}
public boolean cubeFullyInFrustum(float x1, float y1, float z1, float x2, float y2, float z2) {
for (int i = 0; i < 6; i++) {
if (this.m_Frustum[i][0] * x1 + this.m_Frustum[i][1] * y1 + this.m_Frustum[i][2] * z1 + this.m_Frustum[i][3] <= 0.0F)
return false;
if (this.m_Frustum[i][0] * x2 + this.m_Frustum[i][1] * y1 + this.m_Frustum[i][2] * z1 + this.m_Frustum[i][3] <= 0.0F)
return false;
if (this.m_Frustum[i][0] * x1 + this.m_Frustum[i][1] * y2 + this.m_Frustum[i][2] * z1 + this.m_Frustum[i][3] <= 0.0F)
return false;
if (this.m_Frustum[i][0] * x2 + this.m_Frustum[i][1] * y2 + this.m_Frustum[i][2] * z1 + this.m_Frustum[i][3] <= 0.0F)
return false;
if (this.m_Frustum[i][0] * x1 + this.m_Frustum[i][1] * y1 + this.m_Frustum[i][2] * z2 + this.m_Frustum[i][3] <= 0.0F)
return false;
if (this.m_Frustum[i][0] * x2 + this.m_Frustum[i][1] * y1 + this.m_Frustum[i][2] * z2 + this.m_Frustum[i][3] <= 0.0F)
return false;
if (this.m_Frustum[i][0] * x1 + this.m_Frustum[i][1] * y2 + this.m_Frustum[i][2] * z2 + this.m_Frustum[i][3] <= 0.0F)
return false;
if (this.m_Frustum[i][0] * x2 + this.m_Frustum[i][1] * y2 + this.m_Frustum[i][2] * z2 + this.m_Frustum[i][3] <= 0.0F)
return false;
}
return true;
}
public boolean cubeInFrustum(float x1, float y1, float z1, float x2, float y2, float z2) {
return true;
// for (int i = 0; i < 6; i++) {
// if ((this.m_Frustum[i][0] * x1 + this.m_Frustum[i][1] * y1 + this.m_Frustum[i][2] * z1 + this.m_Frustum[i][3] <= 0.0F) && (this.m_Frustum[i][0] * x2 + this.m_Frustum[i][1] * y1 + this.m_Frustum[i][2] * z1 + this.m_Frustum[i][3] <= 0.0F) && (this.m_Frustum[i][0] * x1 + this.m_Frustum[i][1] * y2 + this.m_Frustum[i][2] * z1 + this.m_Frustum[i][3] <= 0.0F) && (this.m_Frustum[i][0] * x2 + this.m_Frustum[i][1] * y2 + this.m_Frustum[i][2] * z1 + this.m_Frustum[i][3] <= 0.0F) && (this.m_Frustum[i][0] * x1 + this.m_Frustum[i][1] * y1 + this.m_Frustum[i][2] * z2 + this.m_Frustum[i][3] <= 0.0F) && (this.m_Frustum[i][0] * x2 + this.m_Frustum[i][1] * y1 + this.m_Frustum[i][2] * z2 + this.m_Frustum[i][3] <= 0.0F) && (this.m_Frustum[i][0] * x1 + this.m_Frustum[i][1] * y2 + this.m_Frustum[i][2] * z2 + this.m_Frustum[i][3] <= 0.0F) && (this.m_Frustum[i][0] * x2 + this.m_Frustum[i][1] * y2 + this.m_Frustum[i][2] * z2 + this.m_Frustum[i][3] <= 0.0F)) {
// return false;
// }
// }
// return true;
}
}
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