// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Build RGB from HSL design values
// Not compiled or tested in-world
// Setup: Use a spare owned prim. Set HUE degrees and SATURATION/LIGHTNESS0..1. Touch for owner-only numeric output.
// Stop / restore: Remove/disable; no colors or materials are applied.
// Notes: HSL lightness is a geometric channel measure, not perceptual luminance.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Color calculation only.
float HUE=220.0;
float SATURATION=0.6;
float LIGHTNESS=0.4;
float channel(float p,float q,float t)
{
    if(t<0.0)t+=1.0;
    if(t>1.0)t-=1.0;
    if(t<1.0/6.0)return p+(q-p)*6.0*t;
    if(t<0.5)return q;
    if(t<2.0/3.0)return p+(q-p)*(2.0/3.0-t)*6.0;
    return p;
}
default
{
    touch_start(integer detectedCount)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        if(SATURATION<0.0||SATURATION>1.0||LIGHTNESS<0.0||LIGHTNESS>1.0)
        {
            llOwnerSay("Saturation/lightness must be0..1.");
            return;
        }
        float h=HUE/360.0;
        h-=llFloor(h);
        float q=LIGHTNESS*(1.0+SATURATION);
        if(LIGHTNESS>=0.5)q=LIGHTNESS+SATURATION-LIGHTNESS*SATURATION;
        float p=2.0*LIGHTNESS-q;
        llOwnerSay("RGB="+(string)<channel(p,q,h+1.0/3.0),channel(p,q,h),channel(p,q,h-1.0/3.0)>);
    }
}