inoise16() [2/4]

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

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)

Definition at line 528 of file noise.cpp.hpp.

                                              {
    fl::i32 ans = inoise16_raw(x,y);
    ans = ans + 17308L;
    fl::u32 pan = ans;
    // pan = (ans * 242L) >> 7.  That's the same as:
    // pan = (ans * 484L) >> 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 *= 484L;
    return (pan>>8);
 
    // return (uint32_t)(((int32_t)inoise16_raw(x,y)+(uint32_t)17308)*242)>>7;
    // return scale16by8(inoise16_raw(x,y)+17308,242)<<1;
}

References FL_NO_EXCEPT, inoise16_raw(), x, and y.

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