// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Ping-pong sprite-sheet motion
// Not compiled or tested in-world
// Setup: Set FACE and apply a 2×2 sheet whose frames form one outward movement. Owner-touch starts and stops.
// Stop / restore: Touch to disable texture animation before removing. The saved diffuse texture/UV settings are restored, but an earlier animation is not recoverable.
// Notes: Use a spare prim with readable classic diffuse texture settings. Material behavior can differ with PBR transforms. PING_PONG avoids a hard jump from the final frame to the first. Frames are read left-to-right, top-to-bottom.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Not compiled or tested in-world.
integer FACE=0;
integer active;
list saved;
default
{
    state_entry()
    {
        saved=llGetLinkPrimitiveParams(LINK_THIS,[PRIM_TEXTURE,FACE]);
    }
    touch_start(integer count)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        active=!active;
        if(active)llSetTextureAnim(ANIM_ON|LOOP|PING_PONG,FACE,2,2,0.0,4.0,2.0);
        else
        {
            llSetTextureAnim(FALSE,FACE,0,0,0.0,0.0,1.0);
            llSetLinkPrimitiveParamsFast(LINK_THIS,[PRIM_TEXTURE,FACE]+saved);
        }
    }
}