Perlin noise: Difference between revisions
Added Algol 68
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<pre>
0.13691995878400011
</pre>
=={{header|ALGOL 68}}==
{{Trans|11l}}
<syntaxhighlight lang="algol68">
BEGIN # perlin noise - translated from the 11l sample #
[ 0 : 511 ]INT p;
p[ 256 : ] := (151,160,137,91,90,15
,131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23
,190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33
,88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166
,77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244
,102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196
,135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123
,5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42
,223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9
,129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228
,251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107
,49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254
,138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180
);
p[ 0 : 255 ] := p[ 256 : ];
OP AND = ( INT a, b )INT:
IF a >= 0
THEN ABS ( BIN a AND BIN b )
ELSE ABS ( NOT BIN ( - ( a + 1 ) ) AND BIN b )
FI # AND # ;
PROC fade = ( REAL t )REAL: ( t * t * t ) * ( t * ( t * 6 - 15 ) + 10 );
PROC linerp = ( REAL t, a, b )REAL: a + ( t * ( b - a ) );
PROC grad = ( INT hash, REAL x, y, z )REAL:
BEGIN
INT h = hash AND 15;
REAL u = IF h < 8 THEN x ELSE y FI;
REAL v = IF h < 4 THEN y ELIF h = 12 OR h = 14 THEN x ELSE z FI;
IF ( h AND 1 ) = 0 THEN u ELSE -u FI + IF ( h AND 2 ) = 0 THEN v ELSE -v FI
END # grad # ;
PROC perlin noise = ( REAL x in, y in, z in )REAL:
BEGIN
REAL x := x in, y := y in, z := z in;
INT xx = ENTIER x AND 255;
INT yy = ENTIER y AND 255;
INT zz = ENTIER z AND 255;
x -:= ENTIER x;
y -:= ENTIER y;
z -:= ENTIER z;
REAL u = fade( x );
REAL v = fade( y );
REAL w = fade( z );
INT a = p[ xx ] + yy;
INT aa = p[ a ] + zz;
INT ab = p[ a + 1 ] + zz;
INT b = p[ xx + 1 ] + yy;
INT ba = p[ b ] + zz;
INT bb = p[ b + 1 ] + zz;
linerp( w
, linerp( v
, linerp( u
, grad( p[ aa ], x, y, z )
, grad( p[ ba ], x - 1, y, z )
)
, linerp( u
, grad( p[ ab ], x, y - 1, z )
, grad( p[ bb ], x - 1, y - 1, z )
)
)
, linerp( v
, linerp( u
, grad( p[ aa + 1 ], x, y, z - 1 )
, grad( p[ ba + 1 ], x - 1, y, z - 1 )
)
, linerp( u
, grad( p[ ab + 1 ], x, y - 1, z - 1 )
, grad( p[ bb + 1 ], x - 1, y - 1, z - 1 )
)
)
)
END # perlin noise # ;
print( ( fixed( perlin noise( 3.14, 42, 7 ), -18, 15 ) ) )
END
</syntaxhighlight>
{{out}}
<pre>
0.136919958784000
</pre>
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