inoise16() [4/4]

fl::u16 inoise16 ( fl::u32 x, fl::u32 y, fl::u32 z, fl::u32 t )

extern

16-bit, fixed point implementation of Perlin's noise.

See also

inoise16_raw()

Returns

scaled noise value as an unsigned integer, 0-65535

Parameters

x	x-axis coordinate on noise map (1D)
y	y-axis coordinate on noise map (2D)
t	t-axis coordinate on noise map (3D)

Definition at line 463 of file noise.cpp.hpp.

                                                                {
    fl::i32 ans = inoise16_raw(x,y,z,t);
    ans = ans + 19052L;
    fl::u32 pan = ans;
    // pan = (ans * 220L) >> 7.  That's the same as:
    // pan = (ans * 440L) >> 8.  And this way avoids a 7X four-byte shift-loop on AVR.
    // Identical math, except for the highest bit, which we don't care about anyway,
    // since we're returning the 'middle' 16 out of a 32-bit value anyway.
    pan *= 440L;
    return (pan>>8);
 
    // return scale16by8(pan,220)<<1;
    // return ((inoise16_raw(x,y,z)+19052)*220)>>7;
    // return scale16by8(inoise16_raw(x,y,z)+19052,220)<<1;
}

Referenced by fill_raw_2dnoise16(), fill_raw_2dnoise16into8(), and fill_raw_noise16into8().

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