vahan3x

// Simple RGB to Linear RGB function respecting negative values
half channelToLinearChannel(half channel) {
    if (fabs(channel) <= 0.04045) {
        return channel / 12.92;
    }
    
    return sign(channel) * pow((fabs(channel) + 0.055) / 1.055, 2.4);
}

// Converting RGB to Linear RGB

vahan3x

// Swift version: 4.0

public extension Comparable {
    
    /// Returns a copy of the value clamped to the given limiting range.
    ///
    /// Example:
    ///
    ///     let a = 50
    ///     print(a.clamped(to: 0 ... 10)) // prints 10