001package net.minecraft.world.gen.layer;
002
003public class GenLayerZoom extends GenLayer
004{
005    public GenLayerZoom(long par1, GenLayer par3GenLayer)
006    {
007        super(par1);
008        super.parent = par3GenLayer;
009    }
010
011    /**
012     * Returns a list of integer values generated by this layer. These may be interpreted as temperatures, rainfall
013     * amounts, or biomeList[] indices based on the particular GenLayer subclass.
014     */
015    public int[] getInts(int par1, int par2, int par3, int par4)
016    {
017        int i1 = par1 >> 1;
018        int j1 = par2 >> 1;
019        int k1 = (par3 >> 1) + 3;
020        int l1 = (par4 >> 1) + 3;
021        int[] aint = this.parent.getInts(i1, j1, k1, l1);
022        int[] aint1 = IntCache.getIntCache(k1 * 2 * l1 * 2);
023        int i2 = k1 << 1;
024        int j2;
025
026        for (int k2 = 0; k2 < l1 - 1; ++k2)
027        {
028            j2 = k2 << 1;
029            int l2 = j2 * i2;
030            int i3 = aint[0 + (k2 + 0) * k1];
031            int j3 = aint[0 + (k2 + 1) * k1];
032
033            for (int k3 = 0; k3 < k1 - 1; ++k3)
034            {
035                this.initChunkSeed((long)(k3 + i1 << 1), (long)(k2 + j1 << 1));
036                int l3 = aint[k3 + 1 + (k2 + 0) * k1];
037                int i4 = aint[k3 + 1 + (k2 + 1) * k1];
038                aint1[l2] = i3;
039                aint1[l2++ + i2] = this.choose(i3, j3);
040                aint1[l2] = this.choose(i3, l3);
041                aint1[l2++ + i2] = this.modeOrRandom(i3, l3, j3, i4);
042                i3 = l3;
043                j3 = i4;
044            }
045        }
046
047        int[] aint2 = IntCache.getIntCache(par3 * par4);
048
049        for (j2 = 0; j2 < par4; ++j2)
050        {
051            System.arraycopy(aint1, (j2 + (par2 & 1)) * (k1 << 1) + (par1 & 1), aint2, j2 * par3, par3);
052        }
053
054        return aint2;
055    }
056
057    /**
058     * Chooses one of the two inputs randomly.
059     */
060    protected int choose(int par1, int par2)
061    {
062        return this.nextInt(2) == 0 ? par1 : par2;
063    }
064
065    /**
066     * returns the mode (most frequently occuring number) or a random number from the 4 integers provided
067     */
068    protected int modeOrRandom(int par1, int par2, int par3, int par4)
069    {
070        if (par2 == par3 && par3 == par4)
071        {
072            return par2;
073        }
074        else if (par1 == par2 && par1 == par3)
075        {
076            return par1;
077        }
078        else if (par1 == par2 && par1 == par4)
079        {
080            return par1;
081        }
082        else if (par1 == par3 && par1 == par4)
083        {
084            return par1;
085        }
086        else if (par1 == par2 && par3 != par4)
087        {
088            return par1;
089        }
090        else if (par1 == par3 && par2 != par4)
091        {
092            return par1;
093        }
094        else if (par1 == par4 && par2 != par3)
095        {
096            return par1;
097        }
098        else if (par2 == par1 && par3 != par4)
099        {
100            return par2;
101        }
102        else if (par2 == par3 && par1 != par4)
103        {
104            return par2;
105        }
106        else if (par2 == par4 && par1 != par3)
107        {
108            return par2;
109        }
110        else if (par3 == par1 && par2 != par4)
111        {
112            return par3;
113        }
114        else if (par3 == par2 && par1 != par4)
115        {
116            return par3;
117        }
118        else if (par3 == par4 && par1 != par2)
119        {
120            return par3;
121        }
122        else if (par4 == par1 && par2 != par3)
123        {
124            return par3;
125        }
126        else if (par4 == par2 && par1 != par3)
127        {
128            return par3;
129        }
130        else if (par4 == par3 && par1 != par2)
131        {
132            return par3;
133        }
134        else
135        {
136            int i1 = this.nextInt(4);
137            return i1 == 0 ? par1 : (i1 == 1 ? par2 : (i1 == 2 ? par3 : par4));
138        }
139    }
140
141    public static GenLayer func_75915_a(long par0, GenLayer par2GenLayer, int par3)
142    {
143        Object object = par2GenLayer;
144
145        for (int k = 0; k < par3; ++k)
146        {
147            object = new GenLayerZoom(par0 + (long)k, (GenLayer)object);
148        }
149
150        return (GenLayer)object;
151    }
152}