// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Plan attack, decay, sustain and release
// Not compiled or tested in-world
// Setup: Put in a spare owned prim. Set positive attack/decay/release, nonnegative hold and sustain0..1. Owner touch prints calculations only.
// Stop / restore: Disable/remove. No prim motion or appearance is changed.
// Notes: This models an animation envelope; it does not synthesize or play sound.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Motion planning only.
float ATTACK=0.3;
float DECAY=0.4;
float HOLD=1.0;
float RELEASE=0.8;
float SUSTAIN=0.6;
float ELAPSED=0.5;
default
{
    touch_start(integer detectedCount)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        if(ATTACK<=0.0||DECAY<=0.0||HOLD<0.0||RELEASE<=0.0||SUSTAIN<0.0||SUSTAIN>1.0)
        {
            llOwnerSay("Invalid ADSR values.");
            return;
        }
        float t=ELAPSED;
        float value=0.0;
        if(t>=0.0)
        {
            if(t<ATTACK)value=t/ATTACK;
            else if(t<ATTACK+DECAY)value=1.0+(SUSTAIN-1.0)*(t-ATTACK)/DECAY;
            else if(t<ATTACK+DECAY+HOLD)value=SUSTAIN;
            else if(t<ATTACK+DECAY+HOLD+RELEASE)value=SUSTAIN*(1.0-(t-ATTACK-DECAY-HOLD)/RELEASE);
        }
        llOwnerSay("Envelope value="+(string)value);
    }
}