ease8InOutCubic()

LIB8STATIC fract8 ease8InOutCubic

(

fract8

i

)

8-bit cubic ease-in / ease-out function.

Takes around 18 cycles on AVR.

Definition at line 574 of file lib8tion.h.

{
    fl::u8 ii  = scale8_LEAVING_R1_DIRTY(  i, i);
    fl::u8 iii = scale8_LEAVING_R1_DIRTY( ii, i);
    // Do not rely on the generated multiplication instructions to restore
    // AVR's zero register: honor the _LEAVING_R1_DIRTY contract explicitly.
    cleanup_R1();
 
    fl::u16 r1 = (3 * (fl::u16)(ii)) - ( 2 * (fl::u16)(iii));
 
    fl::u8 result = r1;
 
    // if we got "256", return 255:
    if( r1 & 0x100 ) {
        result = 255;
    }
    return result;
}

References LIB8STATIC.

Referenced by cubicwave8().

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