// standing wave — chrome
//
// 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 { ... } }
//
// Three lobes that do not travel: the nodes stay where they are and the whole
// pattern breathes in place. Every other preset here moves something round the
// ring, and this is the other half of what waves do -- position decides the
// shape, the clock decides the amplitude, one multiply apart.
//
// `p` below is distance clockwise round the border from the top-left, written
// out in full because there is no way to name a subexpression -- which is why a
// small effect is a long line. `2*cols + 2*rows - 4` is the whole ring.

shaders {
    tint where="chrome" channel="fg" color="#ffffff" amount="abs(sin(TAU * ((y == 0 ? x : x == cols - 1 ? cols - 1 + y : y == rows - 1 ? 2 * cols + rows - 3 - x : 2 * cols + 2 * rows - 4 - y)) * 3 / (2 * cols + 2 * rows - 4))) * abs(sin(t / 6)) / 255"
}