[gmpi] Re: R: Re: Topic 4: Host Interface
- From: "Angus F. Hewlett" <amulet@xxxxxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Tue, 1 Apr 2003 11:56:38 -0500 (EST)
On Mon, 31 Mar 2003, Tim Hockin wrote:
> 1) Every control change is synchronous and function-called - YUCK
> + allows control changes to fail or have return codes
> - still doesn't cleanly handle linked controls
> - a function call for every control change is heavy, as compared to
> events.
>
> 2) Every control change is an event. Events have 'return addresses'.
> Plugins can respond to events by sending failure messages or other control
> changes back out.
> + clean design
> - need to check every change for a failure
> + only need to respond to unusual cases (no return means success)
> - host does a lot of event shuttling
> - responses have a 1 timeslice latency
>
> 3) Communication is one-way and does not fail. If you send a control change
> within a control's bounds, it CAN NOT fail. Linked controls are the problem
> of a custom GUI. Plugins do not spontaneously change their own controls.
> - no generic way to do linked controls
> - no way to update HW for linked controls
> - linked controls require a custom GUI
Following your layout,
4) Communication is one-way, events resulting from the communication, that
might indicate a succesful update, are passed downstream on an
event-output pin.
+ allows control changes to fail
- .. but does not provide notification of this in an immediate or obvious
way
+ linked controls is not a problem
+ allows the plug to generate time-dependent event cascades
+- responses may have latency, it depends how the host graph is layed out
and dependencies resolved
- has implications for host graph complexity
- care must be taken in spec. and host design regarding potential
parameter feedback loops
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