// shine — chrome
//
// Hand-written, unlike contrib/shaders: those are generated from
// contrib/shadertoy.html, and the toy previews a pane's *contents*. A frame is
// a different rect and the toy has no frame to show.
//
// Drop this into ~/.config/slosh/config.kdl (a running session picks it up
// when you save), or point $SLOSH_CONFIG at this file. To hang it off a pane
// state instead of every pane, put the same pass inside one:
//
//     states { bell { ... } }
//
// A highlight running clockwise round the border, wrapping at the corner it
// started from. `min(d, P - d)` is what makes it wrap: distance the short way
// round a ring, rather than along a line that stops.

shaders {
    tint where="chrome" channel="fg" color="#ffffff" amount="clamp(235 - min(abs((y == 0 ? x : x == cols - 1 ? cols - 1 + y : y == rows - 1 ? 2 * cols + rows - 3 - x : 2 * cols + 2 * rows - 4 - y) - (t / 14 % (2 * cols + 2 * rows - 4))), (2 * cols + 2 * rows - 4) - abs((y == 0 ? x : x == cols - 1 ? cols - 1 + y : y == rows - 1 ? 2 * cols + rows - 3 - x : 2 * cols + 2 * rows - 4 - y) - (t / 14 % (2 * cols + 2 * rows - 4)))) * 30, 0, 235)"
}