sin32_interp()

FASTLED_FORCE_INLINE i32 fl::sin32_interp	(	u8	qi,
		u8	qi_next,
		i32	dmask,
		u32	t,
		u8	offset = 0 )

Definition at line 40 of file sin32.h.

                                                                                                      {
    i32 y0 = read_sin32_lut(&sinCosPairedLut[qi * 4 + offset]);
    i32 m0 = read_sin32_lut(&sinCosPairedLut[qi * 4 + offset + 1]);
    i32 y1 = read_sin32_lut(&sinCosPairedLut[qi_next * 4 + offset]);
 
    // Branchless conditional negate derivative
    m0 = (m0 ^ dmask) - dmask;
 
    // Quadratic interpolation (Horner form, 2 muls):
    // P(t) = y0 + T*(m0 + T*(y1 - y0 - m0))  where T = t/65536
    i32 c = y1 - y0 - m0;
    i32 r = (i32)((i64)c * t >> 16) + m0;
    return (i32)(((i64)r * t >> 16) + (i64)y0);
}

References FASTLED_FORCE_INLINE, FL_NOEXCEPT, offset(), read_sin32_lut(), sinCosPairedLut, and t.

Referenced by sin32(), and sincos32().

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