Add a send amp's gain control as a send controllable.

Tweak AutomationControl now that PBD::Controllable has
a default implementation of user_to_ui and ui_to_user. 
Add correct implementations of these methods to
Amp::GainControl.  Hence allow SendProcessorEntry to
use the generic mini-fader-adding code from
ProcessorEntry.


git-svn-id: svn://localhost/ardour2/branches/3.0@11292 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 17 insertions, 4 deletions

diff --git a/libs/ardour/amp.cc b/libs/ardour/amp.cc
index bbbaa9b331..01a31329cf 100644
--- a/libs/ardour/amp.cc
+++ b/libs/ardour/amp.cc
@@ -42,8 +42,11 @@ Amp::Amp (Session& s)
 	, _apply_gain_automation(false)
 	, _current_gain(1.0)
 {
-	boost::shared_ptr<AutomationList> gl(new AutomationList(Evoral::Parameter(GainAutomation)));
-	_gain_control = boost::shared_ptr<GainControl>( new GainControl(X_("gaincontrol"), s, this, Evoral::Parameter(GainAutomation), gl ));
+	Evoral::Parameter p (GainAutomation);
+	/* gain range of -inf to +6dB, default 0dB */
+	p.set_range (0, 1.99526231f, 1, false);
+	boost::shared_ptr<AutomationList> gl (new AutomationList (p));
+	_gain_control = boost::shared_ptr<GainControl> (new GainControl (X_("gaincontrol"), s, this, p, gl));
 	add_control(_gain_control);
 }
 
@@ -371,8 +374,6 @@ Amp::set_gain (gain_t val, void *src)
 		val = 1.99526231f;
 	}
 
-	//cerr << "set desired gain to " << val << " when curgain = " << _gain_control->get_value () << endl;
-
 	if (src != _gain_control.get()) {
 		_gain_control->set_value (val);
 		// bit twisty, this will come back and call us again
@@ -427,6 +428,18 @@ Amp::GainControl::get_value (void) const
 	return AutomationControl::get_value();
 }
 
+double
+Amp::GainControl::user_to_ui (double v) const
+{
+	return gain_to_slider_position (v);
+}
+
+double
+Amp::GainControl::ui_to_user (double v) const
+{
+	return slider_position_to_gain (v);
+}
+
 void
 Amp::setup_gain_automation (framepos_t start_frame, framepos_t end_frame, framecnt_t nframes)
 {