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}