Update mpv config:

mpv/shaders/hdr-toys/utils/invert.glsl

@@ -0,0 +1,21 @@
+// invert the signal
+
+//!HOOK OUTPUT
+//!BIND HOOKED
+//!DESC signal invert
+
+float invert(float x, float w) {
+    return -x + w;
+}
+
+vec3 invert(vec3 x, float w) {
+    return -x + w;
+}
+
+vec4 hook() {
+    vec4 color = HOOKED_tex(HOOKED_pos);
+
+    color.rgb = invert(color.rgb, 1.0);
+
+    return color;
+}