| 25 |
|
#define rand3c(x,y,z) frand(89*(x)+97*(y)+101*(z)) |
| 26 |
|
#define rand3d(x,y,z) frand(103*(x)+107*(y)+109*(z)) |
| 27 |
|
|
| 28 |
< |
#define hermite(p0,p1,r0,r1,t) ( p0*((2.0*t-3.0)*t*t+1.0) + \ |
| 29 |
< |
p1*(-2.0*t+3.0)*t*t + \ |
| 30 |
< |
r0*((t-2.0)*t+1.0)*t + \ |
| 31 |
< |
r1*(t-1.0)*t*t ) |
| 28 |
> |
#define hpoly1(t) ((2.0*t-3.0)*t*t+1.0) |
| 29 |
> |
#define hpoly2(t) (-2.0*t+3.0)*t*t |
| 30 |
> |
#define hpoly3(t) ((t-2.0)*t+1.0)*t |
| 31 |
> |
#define hpoly4(t) (t-1.0)*t*t |
| 32 |
|
|
| 33 |
< |
static char *noise_name[4] = {"noise3a", "noise3b", "noise3c", "noise3"}; |
| 33 |
> |
#define hermite(p0,p1,r0,r1,t) ( p0*hpoly1(t) + \ |
| 34 |
> |
p1*hpoly2(t) + \ |
| 35 |
> |
r0*hpoly3(t) + \ |
| 36 |
> |
r1*hpoly4(t) ) |
| 37 |
> |
|
| 38 |
> |
static char noise_name[4][8] = {"noise3a", "noise3b", "noise3c", "noise3"}; |
| 39 |
|
static char fnoise_name[] = "fnoise3"; |
| 40 |
|
static char hermite_name[] = "hermite"; |
| 41 |
|
|
| 66 |
|
while (i--) |
| 67 |
|
if (nam == noise_name[i]) |
| 68 |
|
return(noise3(x)[i]); |
| 69 |
< |
eputs("Bad call to l_noise3()!\n"); |
| 69 |
> |
eputs(nam); |
| 70 |
> |
eputs(": called l_noise3!\n"); |
| 71 |
|
quit(1); |
| 72 |
|
} |
| 73 |
|
|
| 122 |
|
double f[4]; |
| 123 |
|
register int i, n; |
| 124 |
|
{ |
| 125 |
< |
double f0[4], f1[4]; |
| 125 |
> |
double f0[4], f1[4], hp1, hp2; |
| 126 |
|
|
| 127 |
|
if (n == 0) { |
| 128 |
|
f[A] = rand3a(xlim[0][i&1],xlim[1][i>>1&1],xlim[2][i>>2]); |
| 133 |
|
n--; |
| 134 |
|
interpolate(f0, i, n); |
| 135 |
|
interpolate(f1, i | 1<<n, n); |
| 136 |
< |
f[A] = (1.0-xarg[n])*f0[A] + xarg[n]*f1[A]; |
| 137 |
< |
f[B] = (1.0-xarg[n])*f0[B] + xarg[n]*f1[B]; |
| 138 |
< |
f[C] = (1.0-xarg[n])*f0[C] + xarg[n]*f1[C]; |
| 139 |
< |
f[D] = hermite(f0[D], f1[D], f0[n], f1[n], xarg[n]); |
| 136 |
> |
hp1 = hpoly1(xarg[n]); hp2 = hpoly2(xarg[n]); |
| 137 |
> |
f[A] = f0[A]*hp1 + f1[A]*hp2; |
| 138 |
> |
f[B] = f0[B]*hp1 + f1[B]*hp2; |
| 139 |
> |
f[C] = f0[C]*hp1 + f1[C]*hp2; |
| 140 |
> |
f[D] = f0[D]*hp1 + f1[D]*hp2 + |
| 141 |
> |
f0[n]*hpoly3(xarg[n]) + f1[n]*hpoly4(xarg[n]); |
| 142 |
|
} |
| 143 |
|
} |
| 144 |
|
|
