sincos32()

FASTLED_FORCE_INLINE SinCos32 fl::sincos32

(

u32

angle

)

Definition at line 88 of file sin32.h.

                                                              {
    u8 angle256 = static_cast<u8>(angle >> 16);
    u32 t = angle & 0xFFFF;
 
    u8 quadrant = angle256 >> 6;
    u8 pos = angle256 & 0x3F;
 
    // Quarter-wave mapping (same for both sin and cos)
    u8 mirror_s = quadrant & 1;
    u8 qi = static_cast<u8>(pos + mirror_s * (64 - 2 * pos));
    u8 qi_next = static_cast<u8>(qi + 1 - 2 * mirror_s);
 
    // Derivative masks: sin and cos have opposite mirror states
    i32 sdmask = -static_cast<i32>(mirror_s);
    i32 cdmask = ~sdmask;  // opposite mirror
 
    // Sin at offset 0, cos at offset 2 — same qi, same cache line
    i32 s_raw = sin32_interp(qi, qi_next, sdmask, t, 0);
    i32 c_raw = sin32_interp(qi, qi_next, cdmask, t, 2);
 
    // Sin sign: negative in quadrants 2, 3
    i32 svmask = -static_cast<i32>((quadrant >> 1) & 1);
    // Cos sign: negative in quadrants 1, 2 (XOR of quadrant bits)
    i32 cvmask = -static_cast<i32>((quadrant ^ (quadrant >> 1)) & 1);
 
    SinCos32 out;
    out.sin_val = (i32)(((i64)s_raw ^ svmask) - svmask);
    out.cos_val = (i32)(((i64)c_raw ^ cvmask) - cvmask);
    return out;
}

References fl::SinCos32::cos_val, FASTLED_FORCE_INLINE, FL_NOEXCEPT, pos, sin32_interp(), fl::SinCos32::sin_val, and t.

Referenced by fl::Chasing_Spirals_Q31_SIMD::draw(), render_value_fp(), fl::fixed_point_base< Derived, IntBits, FracBits >::sincos(), and fl::s16x16::sincos().

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