// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Four-quadrant atlas viewer
// Not compiled or tested in-world
// Setup: Use a square atlas as the face diffuse texture. Set FACE; five owner touches cycle quadrants and restoration.
// Stop / restore: Touch through all four quadrants and the fifth touch restores the original settings. Restore before removing or resetting.
// Notes: Classic-material controls only; PBR materials may display differently. Use a spare prim and textures whose settings you can read and restore. Another controller must not edit the same face during the preview. Uses 0.5 repeats and ±0.25 offsets. The atlas orientation depends on your image layout.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Not compiled or tested in-world.
integer FACE = 0;
integer step;
list saved;
default
{
    state_entry()
    {
        saved=llGetLinkPrimitiveParams(LINK_THIS,[PRIM_TEXTURE,FACE]);
    }
    touch_start(integer count)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        if(step==4)
        {
            llSetLinkPrimitiveParamsFast(LINK_THIS,[PRIM_TEXTURE,FACE]+saved);
            step=0;
            llOwnerSay("Original restored.");
            return;
        }
        float x=-0.25;
        float y=0.25;
        if(step%2)x=0.25;
        if(step>1)y=-0.25;
        llSetLinkPrimitiveParamsFast(LINK_THIS,[PRIM_TEXTURE,FACE,llList2String(saved,0),<0.5,0.5,0.0>,<x,y,0.0>,0.0]);
        ++step;
    }
}