easeInOutQuad16()

u16 fl::easeInOutQuad16

(

u16

x

)

16-bit quadratic ease-in/ease-out function Takes an input value 0-65535 and returns an eased value 0-65535

Definition at line 195 of file ease.cpp.hpp.

                           {
    // 16-bit quadratic ease-in / ease-out function
    constexpr u32 MAX = 0xFFFF;          // 65535
    constexpr u32 HALF = (MAX + 1) >> 1; // 32768
    constexpr u32 DENOM = MAX;           // divisor
    constexpr u32 ROUND = DENOM >> 1;    // for rounding
 
    if (x < HALF) {
        // first half: y = 2·(x/MAX)² → y_i = 2·x² / MAX
        fl::u64 xi = x;
        fl::u64 num = 2 * xi * xi + ROUND; // 2*x², +half for rounding
        return u16(num / DENOM);
    } else {
        // second half: y = 1 − 2·(1−x/MAX)² → y_i = MAX − (2·(MAX−x)² / MAX)
        fl::u64 d = MAX - x;
        fl::u64 num = 2 * d * d + ROUND; // 2*(MAX−x)², +half for rounding
        return u16(MAX - (num / DENOM));
    }
}

References MAX, and x.

Referenced by ease16(), and ease16().

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