easeOutSine16()

u16 fl::easeOutSine16

(

u16

i

)

16-bit sine ease-out function Takes an input value 0-65535 and returns an eased value 0-65535

Definition at line 296 of file ease.cpp.

                         {
    // ease-out sine: sin(t * π/2)
    // Handle boundary conditions explicitly
    if (i == 0)
        return 0;
    if (i == 65535)
        return 65535;
 
    // For 16-bit: use sin32 for efficiency and accuracy
    // Map i from [0,65535] to [0,4194304] in sin32 space (zero to quarter wave)
    // Formula: sin(t * π/2) where t goes from 0 to 1
    // sin32 quarter cycle is 16777216/4 = 4194304
    u32 angle = ((fl::u64)i * 4194304ULL) / 65535ULL;
    i32 sin_result = fl::sin32(angle);
    
    // Convert sin32 output range [-2147418112, 2147418112] to [0, 65535]
    // sin32 output is in range -32767*65536 to +32767*65536
    // For ease-out sine, we only use positive portion [0, 2147418112] -> [0, 65535]
    return (u16)((fl::u64)sin_result * 65535ULL / 2147418112ULL);
}

References sin32().

Referenced by ease16(), ease16(), and easeOutSine8().

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