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| public final class Sobol2D { private int i,d0,d1;
private static final int[] D; static { D = new int[33]; int c = D[0] = 1 << 31; for(int i=1; i<32; i++) { c = c ^ (c >>> 1); D[i] = c; } } private final void updateState() { int c = Integer.numberOfTrailingZeros(~i); d1 ^= D[c]; d0 ^= 0x80000000 >>> c; i += 1; } public final int getPos() { return i; } public final void seek(int num) { int n = i + num; int a = i ^ (i >>> 1); int b = n ^ (n >>> 1); int d = a ^ b; int c = 0; while(d != 0) { if ((d & 1) != 0) { d0 ^= 0x80000000 >>> c; d1 ^= D[c]; } d >>>= 1; c += 1; } i = n; } public Sobol2D() { seed(0,0); } public Sobol2D(int seedX, int seedY) { seed(seedX, seedY); } public final void seed(int s0, int s1) { d0 = s0; d1 = s1; i = 0; } public final void next(float[] v, int off) { v[off++] = (d0 >>> 8) * 0x1p-24f; v[off++] = (d1 >>> 8) * 0x1p-24f; updateState(); } public final void next(float[] v) { next(v, 0); } public final void next(java.nio.FloatBuffer fb) { fb.put((d0 >>> 8) * 0x1p-24f); fb.put((d1 >>> 8) * 0x1p-24f); updateState(); } }
public final class Sobol3D { private int i,d0,d1,d2;
private static final int[] D; static { D = new int[65];
int c = 1 << 31; D[0] = c; for(int i=2; i<64; i+=2) { c = c ^ (c >>> 1); D[i] = c; } int s0,s1,t; s0 = D[1] = D[0]; s1 = D[3] = D[2]; for (int i=4; i<64; i+=2) { t = s1; s1 ^= s0 ^ (s0 >>> 2); s0 = t; D[i+1] = s1; } } public Sobol3D() { d0=d1=d2=i=0; } public final void seed(int s0, int s1, int s2) { d0 = s0; d1 = s1; d2 = s2; i = 0; }
public final int getPos() { return i; } private final void updateState() { int c = Integer.numberOfTrailingZeros(~i); int o = c+c; d0 ^= 0x80000000 >>> c; d1 ^= D[o]; d2 ^= D[o+1]; i += 1; } public final void seek(int num) { int n = i + num; int a = i ^ (i >>> 1); int b = n ^ (n >>> 1); int d = a ^ b; int c = 0; while(d != 0) { if ((d & 1) != 0) { d0 ^= 0x80000000 >>> c; d1 ^= D[c+c]; d2 ^= D[c+c+1]; } d >>>= 1; c += 1; } i = n; }
public final void next(float[] v, int off) { v[off++] = (d0 >>> 8) * 0x1p-24f; v[off++] = (d1 >>> 8) * 0x1p-24f; v[off++] = (d2 >>> 8) * 0x1p-24f; updateState(); } public final void next(float[] v) { next(v,0); } public final void next(java.nio.FloatBuffer fb) { fb.put((d0 >>> 8) * 0x1p-24f); fb.put((d1 >>> 8) * 0x1p-24f); fb.put((d2 >>> 8) * 0x1p-24f); updateState(); } } |