// Toggles the nth (0-based) FxProc with the specified procID,
// or all FxProcs with the specified procID if n < 0.
// If me has no FxProc with the specified procID, appends a new one.
// The procID must be one of the Core.Render.Fx.KnownProcIDs.
// For this change to be applied, call FxEffect.UpdateRoutine() subsequently.
func (me *FxProcs) Toggle(procID string, n int) {
var matcher ustr.Matcher
matcher.AddPatterns(procID)
idx, found, all := -1, false, n < 0
for i := 0; i < len(*me); i++ {
if matcher.IsMatch((*me)[i].procID) {
if idx++; all || idx == n {
(*me)[i].Toggle()
}
if found = true; !all {
break
}
}
}
if (!found) && !matcher.HasWildcardPatterns() {
*me = append(*me, FxProc{})
(*me)[len(*me)-1].init(procID, idx+1)
}
}
