sin32()

FASTLED_FORCE_INLINE i32 fl::sin32

(

u32

angle

)

Definition at line 59 of file sin32.h.

                                                      {
    u8 angle256 = static_cast<u8>(angle >> 16);  // 0..255
    u32 t = angle & 0xFFFF;                       // 0..65535
 
    u8 quadrant = angle256 >> 6;    // 0..3
    u8 pos = angle256 & 0x3F;      // 0..63
 
    // Branchless quarter-wave mapping
    u8 mirror = quadrant & 1;
    u8 qi = static_cast<u8>(pos + mirror * (64 - 2 * pos));
    u8 qi_next = static_cast<u8>(qi + 1 - 2 * mirror);
 
    i32 dmask = -static_cast<i32>(mirror);
    i32 raw = sin32_interp(qi, qi_next, dmask, t);
 
    // Branchless sign: negative in quadrants 2, 3
    i32 vmask = -static_cast<i32>((quadrant >> 1) & 1);
    return (i32)(((i64)raw ^ vmask) - vmask);
}

References FASTLED_FORCE_INLINE, FL_NOEXCEPT, pos, sin32_interp(), and t.

Referenced by cos32(), easeOutSine16(), fl::fixed_point_base< Derived, IntBits, FracBits >::sin(), fl::s12x4::sin(), fl::s16x16::sin(), fl::s24x8::sin(), fl::s4x12::sin(), fl::s8x24::sin(), fl::s8x8::sin(), sin16lut(), fl::s12x4::sincos(), fl::s24x8::sincos(), fl::s4x12::sincos(), fl::s8x24::sincos(), and fl::s8x8::sincos().

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