// 
// Decompiled by Procyon v0.5.36
// 

package com.mojang.minecraft.level;

import com.mojang.minecraft.phys.AABB;
import org.lwjgl.opengl.GL11;
import org.lwjgl.BufferUtils;
import java.nio.FloatBuffer;

public class Frustum
{
    public float[][] m_Frustum;
    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 Frustum frustum;
    private FloatBuffer _proj;
    private FloatBuffer _modl;
    private FloatBuffer _clip;
    float[] proj;
    float[] modl;
    float[] clip;
    
    static {
        Frustum.frustum = new Frustum();
    }
    
    private Frustum() {
        this.m_Frustum = new float[6][4];
        this._proj = BufferUtils.createFloatBuffer(16);
        this._modl = BufferUtils.createFloatBuffer(16);
        this._clip = BufferUtils.createFloatBuffer(16);
        this.proj = new float[16];
        this.modl = new float[16];
        this.clip = new float[16];
    }
    
    public static Frustum getFrustum() {
        Frustum.frustum.calculateFrustum();
        return Frustum.frustum;
    }
    
    private void normalizePlane(final float[][] frustum, final int side) {
        final float magnitude = (float)Math.sqrt(frustum[side][0] * frustum[side][0] + frustum[side][1] * frustum[side][1] + frustum[side][2] * frustum[side][2]);
        final float[] array = frustum[side];
        final int n = 0;
        array[n] /= magnitude;
        final float[] array2 = frustum[side];
        final int n2 = 1;
        array2[n2] /= magnitude;
        final float[] array3 = frustum[side];
        final int n3 = 2;
        array3[n3] /= magnitude;
        final float[] array4 = frustum[side];
        final int n4 = 3;
        array4[n4] /= magnitude;
    }
    
    private void calculateFrustum() {
        this._proj.clear();
        this._modl.clear();
        this._clip.clear();
        GL11.glGetFloat(2983, this._proj);
        GL11.glGetFloat(2982, this._modl);
        this._proj.flip().limit(16);
        this._proj.get(this.proj);
        this._modl.flip().limit(16);
        this._modl.get(this.modl);
        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];
        this.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];
        this.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];
        this.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];
        this.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];
        this.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];
        this.normalizePlane(this.m_Frustum, 5);
    }
    
    public boolean pointInFrustum(final float x, final float y, final 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(final float x, final float y, final float z, final 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(final float x1, final float y1, final float z1, final float x2, final float y2, final 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(final float x1, final float y1, final float z1, final float x2, final float y2, final 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) {
                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) {
                    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) {
                        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) {
                            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) {
                                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) {
                                    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) {
                                        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 isVisible(final AABB aabb) {
        return this.cubeInFrustum(aabb.x0, aabb.y0, aabb.z0, aabb.x1, aabb.y1, aabb.z1);
    }
}