X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fsurfaces%2Fpush2%2Fpush2.cc;h=30b521686cfdc80bb21cfe1f4a41c35ee580b1f7;hb=df2b0e33b913f842ed9964cce4c870c45cd02b38;hp=a293c58c6456e1708c1c47d2dd97115ac98ba120;hpb=c4602603b4a229ab7d017f0733a9b771179b4319;p=ardour.git

diff --git a/libs/surfaces/push2/push2.cc b/libs/surfaces/push2/push2.cc
index a293c58c64..30b521686c 100644
--- a/libs/surfaces/push2/push2.cc
+++ b/libs/surfaces/push2/push2.cc
@@ -16,6 +16,9 @@
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include <stdlib.h>
+#include <pthread.h>
+
 #include "pbd/compose.h"
 #include "pbd/convert.h"
 #include "pbd/debug.h"
@@ -28,21 +31,37 @@
 #include "timecode/time.h"
 #include "timecode/bbt_time.h"
 
+#include "ardour/amp.h"
 #include "ardour/async_midi_port.h"
 #include "ardour/audioengine.h"
 #include "ardour/debug.h"
-#include "ardour/filesystem_paths.h"
 #include "ardour/midiport_manager.h"
 #include "ardour/midi_track.h"
 #include "ardour/midi_port.h"
 #include "ardour/session.h"
 #include "ardour/tempo.h"
+#include "ardour/types_convert.h"
 
-#include "push2.h"
+#include "gtkmm2ext/gui_thread.h"
+#include "gtkmm2ext/rgb_macros.h"
+
+#include "canvas/colors.h"
+
+#include "canvas.h"
 #include "gui.h"
+#include "layout.h"
 #include "menu.h"
+#include "mix.h"
+#include "push2.h"
+#include "scale.h"
+#include "splash.h"
+#include "track_mix.h"
+
+#include "pbd/i18n.h"
 
-#include "i18n.h"
+#ifdef PLATFORM_WINDOWS
+#define random() rand()
+#endif
 
 using namespace ARDOUR;
 using namespace std;
@@ -52,76 +71,18 @@ using namespace ArdourSurface;
 
 #include "pbd/abstract_ui.cc" // instantiate template
 
-const int Push2::cols = 960;
-const int Push2::rows = 160;
-const int Push2::pixels_per_row = 1024;
-
 #define ABLETON 0x2982
 #define PUSH2   0x1967
 
-__attribute__((constructor)) static void
-register_enums ()
-{
-	EnumWriter& enum_writer (EnumWriter::instance());
-	vector<int> i;
-	vector<string> s;
-
-	MusicalMode::Type mode;
-
-#define REGISTER(e) enum_writer.register_distinct (typeid(e).name(), i, s); i.clear(); s.clear()
-#define REGISTER_CLASS_ENUM(t,e) i.push_back (t::e); s.push_back (#e)
-
-	REGISTER_CLASS_ENUM (MusicalMode,Dorian);
-	REGISTER_CLASS_ENUM (MusicalMode, IonianMajor);
-	REGISTER_CLASS_ENUM (MusicalMode, Minor);
-	REGISTER_CLASS_ENUM (MusicalMode, HarmonicMinor);
-	REGISTER_CLASS_ENUM (MusicalMode, MelodicMinorAscending);
-	REGISTER_CLASS_ENUM (MusicalMode, MelodicMinorDescending);
-	REGISTER_CLASS_ENUM (MusicalMode, Phrygian);
-	REGISTER_CLASS_ENUM (MusicalMode, Lydian);
-	REGISTER_CLASS_ENUM (MusicalMode, Mixolydian);
-	REGISTER_CLASS_ENUM (MusicalMode, Aeolian);
-	REGISTER_CLASS_ENUM (MusicalMode, Locrian);
-	REGISTER_CLASS_ENUM (MusicalMode, PentatonicMajor);
-	REGISTER_CLASS_ENUM (MusicalMode, PentatonicMinor);
-	REGISTER_CLASS_ENUM (MusicalMode, Chromatic);
-	REGISTER_CLASS_ENUM (MusicalMode, BluesScale);
-	REGISTER_CLASS_ENUM (MusicalMode, NeapolitanMinor);
-	REGISTER_CLASS_ENUM (MusicalMode, NeapolitanMajor);
-	REGISTER_CLASS_ENUM (MusicalMode, Oriental);
-	REGISTER_CLASS_ENUM (MusicalMode, DoubleHarmonic);
-	REGISTER_CLASS_ENUM (MusicalMode, Enigmatic);
-	REGISTER_CLASS_ENUM (MusicalMode, Hirajoshi);
-	REGISTER_CLASS_ENUM (MusicalMode, HungarianMinor);
-	REGISTER_CLASS_ENUM (MusicalMode, HungarianMajor);
-	REGISTER_CLASS_ENUM (MusicalMode, Kumoi);
-	REGISTER_CLASS_ENUM (MusicalMode, Iwato);
-	REGISTER_CLASS_ENUM (MusicalMode, Hindu);
-	REGISTER_CLASS_ENUM (MusicalMode, Spanish8Tone);
-	REGISTER_CLASS_ENUM (MusicalMode, Pelog);
-	REGISTER_CLASS_ENUM (MusicalMode, HungarianGypsy);
-	REGISTER_CLASS_ENUM (MusicalMode, Overtone);
-	REGISTER_CLASS_ENUM (MusicalMode, LeadingWholeTone);
-	REGISTER_CLASS_ENUM (MusicalMode, Arabian);
-	REGISTER_CLASS_ENUM (MusicalMode, Balinese);
-	REGISTER_CLASS_ENUM (MusicalMode, Gypsy);
-	REGISTER_CLASS_ENUM (MusicalMode, Mohammedan);
-	REGISTER_CLASS_ENUM (MusicalMode, Javanese);
-	REGISTER_CLASS_ENUM (MusicalMode, Persian);
-	REGISTER_CLASS_ENUM (MusicalMode, Algerian);
-	REGISTER (mode);
-}
-
 Push2::Push2 (ARDOUR::Session& s)
 	: ControlProtocol (s, string (X_("Ableton Push 2")))
 	, AbstractUI<Push2Request> (name())
 	, handle (0)
-	, device_buffer (0)
-	, frame_buffer (Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, cols, rows))
+	, in_use (false)
 	, _modifier_state (None)
 	, splash_start (0)
 	, _current_layout (0)
-	, drawn_layout (0)
+	, _previous_layout (0)
 	, connection_state (ConnectionState (0))
 	, gui (0)
 	, _mode (MusicalMode::IonianMajor)
@@ -130,26 +91,37 @@ Push2::Push2 (ARDOUR::Session& s)
 	, _in_key (true)
 	, octave_shift (0)
 	, percussion (false)
+	, _pressure_mode (AfterTouch)
+	, selection_color (LED::Green)
+	, contrast_color (LED::Green)
+	, in_range_select (false)
 {
-	context = Cairo::Context::create (frame_buffer);
+	/* we're going to need this */
+
+	libusb_init (NULL);
 
-	build_pad_table ();
 	build_maps ();
+	build_color_map ();
+	fill_color_table ();
 
 	/* master cannot be removed, so no need to connect to going-away signal */
 	master = session->master_out ();
 
-	if (open ()) {
-		throw failed_constructor ();
-	}
-
 	ControlProtocol::StripableSelectionChanged.connect (selection_connection, MISSING_INVALIDATOR, boost::bind (&Push2::stripable_selection_change, this, _1), this);
 
-	/* catch current selection, if any */
-	{
-		StripableNotificationListPtr sp (new StripableNotificationList (ControlProtocol::last_selected()));
-		stripable_selection_change (sp);
-	}
+	/* allocate graphics layouts, even though we're not using them yet */
+
+	_canvas = new Push2Canvas (*this, 960, 160);
+	mix_layout = new MixLayout (*this, *session, "globalmix");
+	scale_layout = new ScaleLayout (*this, *session, "scale");
+	track_mix_layout = new TrackMixLayout (*this, *session, "trackmix");
+	splash_layout = new SplashLayout (*this, *session, "splash");
+
+	run_event_loop ();
+
+	/* Ports exist for the life of this instance */
+
+	ports_acquire ();
 
 	/* catch arrival and departure of Push2 itself */
 	ARDOUR::AudioEngine::instance()->PortRegisteredOrUnregistered.connect (port_reg_connection, MISSING_INVALIDATOR, boost::bind (&Push2::port_registration_handler, this), this);
@@ -157,70 +129,113 @@ Push2::Push2 (ARDOUR::Session& s)
 	/* Catch port connections and disconnections */
 	ARDOUR::AudioEngine::instance()->PortConnectedOrDisconnected.connect (port_connection, MISSING_INVALIDATOR, boost::bind (&Push2::connection_handler, this, _1, _2, _3, _4, _5), this);
 
-	/* ports might already be there */
+	/* Push 2 ports might already be there */
 	port_registration_handler ();
 }
 
 Push2::~Push2 ()
 {
-	stop ();
+	DEBUG_TRACE (DEBUG::Push2, "push2 control surface object being destroyed\n");
+
+	/* do this before stopping the event loop, so that we don't get any notifications */
+	selection_connection.disconnect ();
+	port_reg_connection.disconnect ();
+	port_connection.disconnect ();
+
+	stop_using_device ();
+	device_release ();
+	ports_release ();
+
+	if (_current_layout) {
+		_canvas->root()->remove (_current_layout);
+		_current_layout = 0;
+	}
+
+	delete mix_layout;
+	mix_layout = 0;
+	delete scale_layout;
+	scale_layout = 0;
+	delete splash_layout;
+	splash_layout = 0;
+	delete track_mix_layout;
+	track_mix_layout = 0;
+
+	stop_event_loop ();
 }
 
+
 void
-Push2::port_registration_handler ()
+Push2::run_event_loop ()
 {
-	if (_async_in->connected() && _async_out->connected()) {
-		/* don't waste cycles here */
-		return;
-	}
+	DEBUG_TRACE (DEBUG::Push2, "start event loop\n");
+	BaseUI::run ();
+}
 
-	string input_port_name = X_("Ableton Push 2 MIDI 1 in");
-	string output_port_name = X_("Ableton Push 2 MIDI 1 out");
-	vector<string> in;
-	vector<string> out;
+void
+Push2::stop_event_loop ()
+{
+	DEBUG_TRACE (DEBUG::Push2, "stop event loop\n");
+	BaseUI::quit ();
+}
 
-	AudioEngine::instance()->get_ports (string_compose (".*%1", input_port_name), DataType::MIDI, PortFlags (IsPhysical|IsOutput), in);
-	AudioEngine::instance()->get_ports (string_compose (".*%1", output_port_name), DataType::MIDI, PortFlags (IsPhysical|IsInput), out);
+int
+Push2::begin_using_device ()
+{
+	DEBUG_TRACE (DEBUG::Push2, "begin using device\n");
 
-	if (!in.empty() && !out.empty()) {
-		cerr << "Push2: both ports found\n";
-		cerr << "\tconnecting to " << in.front() <<  " + " << out.front() << endl;
-		if (!_async_in->connected()) {
-			AudioEngine::instance()->connect (_async_in->name(), in.front());
-		}
-		if (!_async_out->connected()) {
-			AudioEngine::instance()->connect (_async_out->name(), out.front());
-		}
+	/* set up periodic task used to push a frame buffer to the
+	 * device (25fps). The device can handle 60fps, but we don't
+	 * need that frame rate.
+	 */
+
+	Glib::RefPtr<Glib::TimeoutSource> vblank_timeout = Glib::TimeoutSource::create (40); // milliseconds
+	vblank_connection = vblank_timeout->connect (sigc::mem_fun (*this, &Push2::vblank));
+	vblank_timeout->attach (main_loop()->get_context());
+
+	connect_session_signals ();
+
+	init_buttons (true);
+	init_touch_strip ();
+	set_pad_scale (_scale_root, _root_octave, _mode, _in_key);
+	splash ();
+
+	/* catch current selection, if any so that we can wire up the pads if appropriate */
+	{
+		StripableNotificationListPtr sp (new StripableNotificationList (ControlProtocol::last_selected()));
+		stripable_selection_change (sp);
 	}
+
+	request_pressure_mode ();
+
+	in_use = true;
+
+	return 0;
 }
 
 int
-Push2::open ()
+Push2::stop_using_device ()
 {
-	int err;
+	DEBUG_TRACE (DEBUG::Push2, "stop using device\n");
 
-	if (handle) {
-		/* already open */
+	if (!in_use) {
+		DEBUG_TRACE (DEBUG::Push2, "nothing to do, device not in use\n");
 		return 0;
 	}
 
-	if ((handle = libusb_open_device_with_vid_pid (NULL, ABLETON, PUSH2)) == 0) {
-		return -1;
-	}
-
-	if ((err = libusb_claim_interface (handle, 0x00))) {
-		return -1;
-	}
+	init_buttons (false);
+	strip_buttons_off ();
 
-	device_frame_buffer = new uint16_t[rows*pixels_per_row];
+	vblank_connection.disconnect ();
+	session_connections.drop_connections ();
 
-	memset (device_frame_buffer, 0, sizeof (uint16_t) * rows * pixels_per_row);
+	in_use = false;
+	return 0;
+}
 
-	frame_header[0] = 0xef;
-	frame_header[1] = 0xcd;
-	frame_header[2] = 0xab;
-	frame_header[3] = 0x89;
-	memset (&frame_header[4], 0, 12);
+int
+Push2::ports_acquire ()
+{
+	DEBUG_TRACE (DEBUG::Push2, "acquiring ports\n");
 
 	/* setup ports */
 
@@ -228,12 +243,13 @@ Push2::open ()
 	_async_out = AudioEngine::instance()->register_output_port (DataType::MIDI, X_("Push 2 out"), true);
 
 	if (_async_in == 0 || _async_out == 0) {
+		DEBUG_TRACE (DEBUG::Push2, "cannot register ports\n");
 		return -1;
 	}
 
 	/* We do not add our ports to the input/output bundles because we don't
 	 * want users wiring them by hand. They could use JACK tools if they
-	 * really insist on that.
+	 * really insist on that (and use JACK)
 	 */
 
 	_input_port = boost::dynamic_pointer_cast<AsyncMIDIPort>(_async_in).get();
@@ -262,29 +278,21 @@ Push2::open ()
 
 	connect_to_parser ();
 
-	mix_layout = new MixLayout (*this, *session, context);
-	scale_layout = new ScaleLayout (*this, *session, context);
-	_current_layout = mix_layout;
+	/* Connect input port to event loop */
 
-	return 0;
-}
+	AsyncMIDIPort* asp;
 
-list<boost::shared_ptr<ARDOUR::Bundle> >
-Push2::bundles ()
-{
-	list<boost::shared_ptr<ARDOUR::Bundle> > b;
+	asp = dynamic_cast<AsyncMIDIPort*> (_input_port);
+	asp->xthread().set_receive_handler (sigc::bind (sigc::mem_fun (this, &Push2::midi_input_handler), _input_port));
+	asp->xthread().attach (main_loop()->get_context());
 
-	if (_output_bundle) {
-		b.push_back (_output_bundle);
-	}
-
-	return b;
+	return 0;
 }
 
-int
-Push2::close ()
+void
+Push2::ports_release ()
 {
-	init_buttons (false);
+	DEBUG_TRACE (DEBUG::Push2, "releasing ports\n");
 
 	/* wait for button data to be flushed */
 	AsyncMIDIPort* asp;
@@ -298,30 +306,75 @@ Push2::close ()
 	_async_out.reset ((ARDOUR::Port*) 0);
 	_input_port = 0;
 	_output_port = 0;
+}
 
-	vblank_connection.disconnect ();
-	periodic_connection.disconnect ();
-	session_connections.drop_connections ();
+int
+Push2::device_acquire ()
+{
+	int err;
 
-	_current_layout = 0;
-	drawn_layout = 0;
-	delete mix_layout;
-	mix_layout = 0;
-	delete scale_layout;
-	scale_layout = 0;
+	DEBUG_TRACE (DEBUG::Push2, "acquiring device\n");
 
+	if (handle) {
+		DEBUG_TRACE (DEBUG::Push2, "open() called with handle already set\n");
+		/* already open */
+		return 0;
+	}
+
+	if ((handle = libusb_open_device_with_vid_pid (NULL, ABLETON, PUSH2)) == 0) {
+		DEBUG_TRACE (DEBUG::Push2, "failed to open USB handle\n");
+		return -1;
+	}
+
+	if ((err = libusb_claim_interface (handle, 0x00))) {
+		DEBUG_TRACE (DEBUG::Push2, "failed to claim USB device\n");
+		libusb_close (handle);
+		handle = 0;
+		return -1;
+	}
+
+	return 0;
+}
+
+void
+Push2::device_release ()
+{
+	DEBUG_TRACE (DEBUG::Push2, "releasing device\n");
 	if (handle) {
 		libusb_release_interface (handle, 0x00);
 		libusb_close (handle);
 		handle = 0;
 	}
+}
 
-	delete [] device_frame_buffer;
-	device_frame_buffer = 0;
+list<boost::shared_ptr<ARDOUR::Bundle> >
+Push2::bundles ()
+{
+	list<boost::shared_ptr<ARDOUR::Bundle> > b;
 
-	return 0;
+	if (_output_bundle) {
+		b.push_back (_output_bundle);
+	}
+
+	return b;
 }
 
+void
+Push2::strip_buttons_off ()
+{
+	ButtonID strip_buttons[] = { Upper1, Upper2, Upper3, Upper4, Upper5, Upper6, Upper7, Upper8,
+	                             Lower1, Lower2, Lower3, Lower4, Lower5, Lower6, Lower7, Lower8, };
+
+	for (size_t n = 0; n < sizeof (strip_buttons) / sizeof (strip_buttons[0]); ++n) {
+		Button* b = id_button_map[strip_buttons[n]];
+
+		b->set_color (LED::Black);
+		b->set_state (LED::OneShot24th);
+		write (b->state_msg());
+	}
+}
+
+
 void
 Push2::init_buttons (bool startup)
 {
@@ -330,7 +383,7 @@ Push2::init_buttons (bool startup)
 	*/
 
 	ButtonID buttons[] = { Mute, Solo, Master, Up, Right, Left, Down, Note, Session, Mix, AddTrack, Delete, Undo,
-	                       Metronome, Shift, Select, Play, RecordEnable, Automate, Repeat, Note, Session, DoubleLoop,
+	                       Metronome, Shift, Select, Play, RecordEnable, Automate, Repeat, Note, Session,
 	                       Quantize, Duplicate, Browse, PageRight, PageLeft, OctaveUp, OctaveDown, Layout, Scale
 	};
 
@@ -346,21 +399,6 @@ Push2::init_buttons (bool startup)
 		write (b->state_msg());
 	}
 
-	/* Strip buttons should all be off (black) by default. They will change
-	 * color to reflect various conditions
-	 */
-
-	ButtonID strip_buttons[] = { Upper1, Upper2, Upper3, Upper4, Upper5, Upper6, Upper7, Upper8,
-	                             Lower1, Lower2, Lower3, Lower4, Lower5, Lower6, Lower7, Lower8, };
-
-	for (size_t n = 0; n < sizeof (strip_buttons) / sizeof (strip_buttons[0]); ++n) {
-		Button* b = id_button_map[strip_buttons[n]];
-
-		b->set_color (LED::Black);
-		b->set_state (LED::OneShot24th);
-		write (b->state_msg());
-	}
-
 	if (startup) {
 
 		/* all other buttons are off (black) */
@@ -392,16 +430,6 @@ Push2::init_buttons (bool startup)
 bool
 Push2::probe ()
 {
-	libusb_device_handle *h;
-	libusb_init (NULL);
-
-	if ((h = libusb_open_device_with_vid_pid (NULL, ABLETON, PUSH2)) == 0) {
-		DEBUG_TRACE (DEBUG::Push2, "no Push2 device found\n");
-		return false;
-	}
-
-	libusb_close (h);
-	DEBUG_TRACE (DEBUG::Push2, "Push2 device located\n");
 	return true;
 }
 
@@ -419,132 +447,43 @@ Push2::request_factory (uint32_t num_requests)
 void
 Push2::do_request (Push2Request * req)
 {
-	DEBUG_TRACE (DEBUG::Push2, string_compose ("doing request type %1\n", req->type));
 	if (req->type == CallSlot) {
 
 		call_slot (MISSING_INVALIDATOR, req->the_slot);
 
 	} else if (req->type == Quit) {
 
-		stop ();
+		stop_using_device ();
 	}
 }
 
-int
-Push2::stop ()
-{
-	BaseUI::quit ();
-	close ();
-	return 0;
-}
-
-/** render host-side frame buffer (a Cairo ImageSurface) to the current
- * device-side frame buffer. The device frame buffer will be pushed to the
- * device on the next call to vblank()
- */
-
-int
-Push2::blit_to_device_frame_buffer ()
+void
+Push2::splash ()
 {
-	/* ensure that all drawing has been done before we fetch pixel data */
-
-	frame_buffer->flush ();
-
-	const int stride = 3840; /* bytes per row for Cairo::FORMAT_ARGB32 */
-	const uint8_t* data = frame_buffer->get_data ();
-
-	/* fill frame buffer (320kB) */
-
-	uint16_t* fb = (uint16_t*) device_frame_buffer;
-
-	for (int row = 0; row < rows; ++row) {
-
-		const uint8_t* dp = data + row * stride;
-
-		for (int col = 0; col < cols; ++col) {
-
-			/* fetch r, g, b (range 0..255). Ignore alpha */
-
-			const int r = (*((const uint32_t*)dp) >> 16) & 0xff;
-			const int g = (*((const uint32_t*)dp) >> 8) & 0xff;
-			const int b = *((const uint32_t*)dp) & 0xff;
-
-			/* convert to 5 bits, 6 bits, 5 bits, respectively */
-			/* generate 16 bit BGB565 value */
-
-			*fb++ = (r >> 3) | ((g & 0xfc) << 3) | ((b & 0xf8) << 8);
-
-			/* the push2 docs state that we should xor the pixel
-			 * data. Doing so doesn't work correctly, and not doing
-			 * so seems to work fine (colors roughly match intended
-			 * values).
-			 */
-
-			dp += 4;
-		}
-
-		/* skip 128 bytes to next line. This is filler, used to avoid line borders occuring in the middle of 512
-		   byte USB buffers
-		*/
-
-		fb += 64; /* 128 bytes = 64 int16_t */
-	}
-
-	return 0;
+	set_current_layout (splash_layout);
+	splash_start = get_microseconds ();
 }
 
 bool
-Push2::redraw ()
+Push2::vblank ()
 {
 	if (splash_start) {
 
-		/* display splash for 3 seconds */
+		/* display splash for 2 seconds */
 
-		if (get_microseconds() - splash_start > 3000000) {
+		if (get_microseconds() - splash_start > 2000000) {
 			splash_start = 0;
-		} else {
-			return false;
+			DEBUG_TRACE (DEBUG::Push2, "splash interval ended, switch to mix layout\n");
+			set_current_layout (mix_layout);
 		}
 	}
 
-	Glib::Threads::Mutex::Lock lm (layout_lock, Glib::Threads::TRY_LOCK);
-
-	if (!lm.locked()) {
-		/* can't get layout, no re-render needed */
-		return false;
-	}
-
-	bool render_needed = false;
-
-	if (drawn_layout != _current_layout) {
-		render_needed = true;
+	if (_current_layout) {
+		_current_layout->update_meters ();
+		_current_layout->update_clocks ();
 	}
 
-	bool dirty = _current_layout->redraw (context);
-	drawn_layout = _current_layout;
-
-	return dirty || render_needed;
-}
-
-bool
-Push2::vblank ()
-{
-	int transferred = 0;
-	const int timeout_msecs = 1000;
-	int err;
-
-	if ((err = libusb_bulk_transfer (handle, 0x01, frame_header, sizeof (frame_header), &transferred, timeout_msecs))) {
-		return false;
-	}
-
-	if (redraw()) {
-		/* things changed */
-		blit_to_device_frame_buffer ();
-	}
-
-	if ((err = libusb_bulk_transfer (handle, 0x01, (uint8_t*) device_frame_buffer , 2 * rows * pixels_per_row, &transferred, timeout_msecs))) {
-		return false;
-	}
+	_canvas->vblank();
 
 	return true;
 }
@@ -560,50 +499,20 @@ Push2::set_active (bool yn)
 
 	if (yn) {
 
-		/* start event loop */
-
-		BaseUI::run ();
-
-		if (open ()) {
-			DEBUG_TRACE (DEBUG::Push2, "device open failed\n");
-			close ();
+		if (device_acquire ()) {
 			return -1;
 		}
 
-		/* Connect input port to event loop */
-
-		AsyncMIDIPort* asp;
-
-		asp = dynamic_cast<AsyncMIDIPort*> (_input_port);
-		asp->xthread().set_receive_handler (sigc::bind (sigc::mem_fun (this, &Push2::midi_input_handler), _input_port));
-		asp->xthread().attach (main_loop()->get_context());
-
-		connect_session_signals ();
-
-		/* set up periodic task used to push a frame buffer to the
-		 * device (25fps). The device can handle 60fps, but we don't
-		 * need that frame rate.
-		 */
-
-		Glib::RefPtr<Glib::TimeoutSource> vblank_timeout = Glib::TimeoutSource::create (40); // milliseconds
-		vblank_connection = vblank_timeout->connect (sigc::mem_fun (*this, &Push2::vblank));
-		vblank_timeout->attach (main_loop()->get_context());
-
-
-		Glib::RefPtr<Glib::TimeoutSource> periodic_timeout = Glib::TimeoutSource::create (1000); // milliseconds
-		periodic_connection = periodic_timeout->connect (sigc::mem_fun (*this, &Push2::periodic));
-		periodic_timeout->attach (main_loop()->get_context());
-
-		init_buttons (true);
-		init_touch_strip ();
-		set_pad_scale (_scale_root, _root_octave, _mode, _in_key);
-		splash ();
-
+		if ((connection_state & (InputConnected|OutputConnected)) == (InputConnected|OutputConnected)) {
+			begin_using_device ();
+		} else {
+			/* begin_using_device () will get called once we're connected */
+		}
 
 	} else {
-
-		stop ();
-
+		/* Control Protocol Manager never calls us with false, but
+		 * insteads destroys us.
+		 */
 	}
 
 	ControlProtocol::set_active (yn);
@@ -644,27 +553,23 @@ Push2::midi_input_handler (IOCondition ioc, MIDI::Port* port)
 
 	if (ioc & IO_IN) {
 
-		// DEBUG_TRACE (DEBUG::Push2, string_compose ("something happend on  %1\n", port->name()));
+		DEBUG_TRACE (DEBUG::Push2, string_compose ("something happend on  %1\n", port->name()));
 
 		AsyncMIDIPort* asp = dynamic_cast<AsyncMIDIPort*>(port);
 		if (asp) {
 			asp->clear ();
 		}
 
-		//DEBUG_TRACE (DEBUG::Push2, string_compose ("data available on %1\n", port->name()));
-		framepos_t now = AudioEngine::instance()->sample_time();
-		port->parse (now);
+		DEBUG_TRACE (DEBUG::Push2, string_compose ("data available on %1\n", port->name()));
+		if (in_use) {
+			framepos_t now = AudioEngine::instance()->sample_time();
+			port->parse (now);
+		}
 	}
 
 	return true;
 }
 
-bool
-Push2::periodic ()
-{
-	return true;
-}
-
 void
 Push2::connect_to_parser ()
 {
@@ -688,6 +593,31 @@ void
 Push2::handle_midi_sysex (MIDI::Parser&, MIDI::byte* raw_bytes, size_t sz)
 {
 	DEBUG_TRACE (DEBUG::Push2, string_compose ("Sysex, %1 bytes\n", sz));
+
+	if (sz < 8) {
+		return;
+	}
+
+	MidiByteArray msg (sz, raw_bytes);
+	MidiByteArray push2_sysex_header (6, 0xF0, 0x00, 0x21, 0x1D, 0x01, 0x01);
+
+	if (!push2_sysex_header.compare_n (msg, 6)) {
+		return;
+	}
+
+	switch (msg[6]) {
+	case 0x1f: /* pressure mode */
+		if (msg[7] == 0x0) {
+			_pressure_mode = AfterTouch;
+			PressureModeChange (AfterTouch);
+			cerr << "Pressure mode is after\n";
+		} else {
+			_pressure_mode = PolyPressure;
+			PressureModeChange (PolyPressure);
+			cerr << "Pressure mode is poly\n";
+		}
+		break;
+	}
 }
 
 void
@@ -786,7 +716,7 @@ Push2::handle_midi_controller_message (MIDI::Parser&, MIDI::EventTwoBytes* ev)
 void
 Push2::handle_midi_note_on_message (MIDI::Parser& parser, MIDI::EventTwoBytes* ev)
 {
-	DEBUG_TRACE (DEBUG::Push2, string_compose ("Note On %1 (velocity %2)\n", (int) ev->note_number, (int) ev->velocity));
+	// DEBUG_TRACE (DEBUG::Push2, string_compose ("Note On %1 (velocity %2)\n", (int) ev->note_number, (int) ev->velocity));
 
 	if (ev->velocity == 0) {
 		handle_midi_note_off_message (parser, ev);
@@ -844,22 +774,26 @@ Push2::handle_midi_note_on_message (MIDI::Parser& parser, MIDI::EventTwoBytes* e
 		return;
 	}
 
-	/* Pad */
+	/* Pad illuminations */
 
-	NNPadMap::iterator pi = nn_pad_map.find (ev->note_number);
+	NNPadMap::const_iterator pm = nn_pad_map.find (ev->note_number);
 
-	if (pi == nn_pad_map.end()) {
+	if (pm == nn_pad_map.end()) {
 		return;
 	}
 
-	Pad* pad = pi->second;
+	const Pad * const pad_pressed = pm->second;
 
-	if (pad->do_when_pressed == Pad::FlashOn) {
-		pad->set_color (LED::White);
-		pad->set_state (LED::OneShot24th);
-		write (pad->state_msg());
-	} else if (pad->do_when_pressed == Pad::FlashOff) {
-		pad->set_color (LED::Black);
+	pair<FNPadMap::iterator,FNPadMap::iterator> pads_with_note = fn_pad_map.equal_range (pad_pressed->filtered);
+
+	if (pads_with_note.first == fn_pad_map.end()) {
+		return;
+	}
+
+	for (FNPadMap::iterator pi = pads_with_note.first; pi != pads_with_note.second; ++pi) {
+		Pad* pad = pi->second;
+
+		pad->set_color (contrast_color);
 		pad->set_state (LED::OneShot24th);
 		write (pad->state_msg());
 	}
@@ -868,7 +802,7 @@ Push2::handle_midi_note_on_message (MIDI::Parser& parser, MIDI::EventTwoBytes* e
 void
 Push2::handle_midi_note_off_message (MIDI::Parser&, MIDI::EventTwoBytes* ev)
 {
-	DEBUG_TRACE (DEBUG::Push2, string_compose ("Note Off %1 (velocity %2)\n", (int) ev->note_number, (int) ev->velocity));
+	// DEBUG_TRACE (DEBUG::Push2, string_compose ("Note Off %1 (velocity %2)\n", (int) ev->note_number, (int) ev->velocity));
 
 	if (ev->note_number < 11) {
 		/* theoretically related to encoder touch start/end, but
@@ -878,22 +812,34 @@ Push2::handle_midi_note_off_message (MIDI::Parser&, MIDI::EventTwoBytes* ev)
 		return;
 	}
 
-	NNPadMap::iterator pi = nn_pad_map.find (ev->note_number);
+	/* Pad illuminations */
+
+	NNPadMap::const_iterator pm = nn_pad_map.find (ev->note_number);
 
-	if (pi == nn_pad_map.end()) {
+	if (pm == nn_pad_map.end()) {
 		return;
 	}
 
-	Pad* pad = pi->second;
+	const Pad * const pad_pressed = pm->second;
 
-	if (pad->do_when_pressed == Pad::FlashOn) {
-		pad->set_color (LED::Black);
-		pad->set_state (LED::OneShot24th);
-		write (pad->state_msg());
-	} else if (pad->do_when_pressed == Pad::FlashOff) {
-		pad->set_color (pad->perma_color);
-		pad->set_state (LED::OneShot24th);
-		write (pad->state_msg());
+	pair<FNPadMap::iterator,FNPadMap::iterator> pads_with_note = fn_pad_map.equal_range (pad_pressed->filtered);
+
+	if (pads_with_note.first == fn_pad_map.end()) {
+		return;
+	}
+
+	for (FNPadMap::iterator pi = pads_with_note.first; pi != pads_with_note.second; ++pi) {
+		Pad* pad = pi->second;
+
+		if (pad->do_when_pressed == Pad::FlashOn) {
+			pad->set_color (LED::Black);
+			pad->set_state (LED::OneShot24th);
+			write (pad->state_msg());
+		} else if (pad->do_when_pressed == Pad::FlashOff) {
+			pad->set_color (pad->perma_color);
+			pad->set_state (LED::OneShot24th);
+			write (pad->state_msg());
+		}
 	}
 }
 
@@ -1049,10 +995,10 @@ Push2::get_state()
 	child->add_child_nocopy (_async_out->get_state());
 	node.add_child_nocopy (*child);
 
-	node.add_property (X_("root"), to_string (_scale_root, std::dec));
-	node.add_property (X_("root_octave"), to_string (_root_octave, std::dec));
-	node.add_property (X_("in_key"), _in_key ? X_("yes") : X_("no"));
-	node.add_property (X_("mode"), enum_2_string (_mode));
+	node.set_property (X_("root"), _scale_root);
+	node.set_property (X_("root-octave"), _root_octave);
+	node.set_property (X_("in-key"), _in_key);
+	node.set_property (X_("mode"), _mode);
 
 	return node;
 }
@@ -1084,23 +1030,10 @@ Push2::set_state (const XMLNode & node, int version)
 		}
 	}
 
-	XMLProperty const* prop;
-
-	if ((prop = node.property (X_("root"))) != 0) {
-		_scale_root = atoi (prop->value());
-	}
-
-	if ((prop = node.property (X_("root_octave"))) != 0) {
-		_root_octave = atoi (prop->value());
-	}
-
-	if ((prop = node.property (X_("in_key"))) != 0) {
-		_in_key = string_is_affirmative (prop->value());
-	}
-
-	if ((prop = node.property (X_("mode"))) != 0) {
-		_mode = (MusicalMode::Type) string_2_enum (prop->value(), _mode);
-	}
+	node.get_property (X_("root"), _scale_root);
+	node.get_property (X_("root-octave"), _root_octave);
+	node.get_property (X_("in-key"), _in_key);
+	node.get_property (X_("mode"), _mode);
 
 	return retval;
 }
@@ -1108,17 +1041,31 @@ Push2::set_state (const XMLNode & node, int version)
 void
 Push2::other_vpot (int n, int delta)
 {
+	boost::shared_ptr<Amp> click_gain;
 	switch (n) {
 	case 0:
+		/* tempo control */
 		break;
 	case 1:
+		/* metronome gain control */
+		click_gain = session->click_gain();
+		if (click_gain) {
+			boost::shared_ptr<AutomationControl> ac = click_gain->gain_control();
+			if (ac) {
+				ac->set_value (ac->interface_to_internal (
+					               min (ac->upper(), max (ac->lower(), ac->internal_to_interface (ac->get_value()) + (delta/256.0)))),
+				               PBD::Controllable::UseGroup);
+			}
+		}
 		break;
 	case 2:
 		/* master gain control */
 		if (master) {
 			boost::shared_ptr<AutomationControl> ac = master->gain_control();
 			if (ac) {
-				ac->set_value (ac->get_value() + ((2.0/64.0) * delta), PBD::Controllable::UseGroup);
+				ac->set_value (ac->interface_to_internal (
+					               min (ac->upper(), max (ac->lower(), ac->internal_to_interface (ac->get_value()) + (delta/256.0)))),
+				               PBD::Controllable::UseGroup);
 			}
 		}
 		break;
@@ -1172,65 +1119,6 @@ Push2::end_shift ()
 	}
 }
 
-void
-Push2::splash ()
-{
-	std::string splash_file;
-
-	Searchpath rc (ARDOUR::ardour_data_search_path());
-	rc.add_subdirectory_to_paths ("resources");
-
-	if (!find_file (rc, PROGRAM_NAME "-splash.png", splash_file)) {
-		cerr << "Cannot find splash screen image file\n";
-		throw failed_constructor();
-	}
-
-	Cairo::RefPtr<Cairo::ImageSurface> img = Cairo::ImageSurface::create_from_png (splash_file);
-
-	double x_ratio = (double) img->get_width() / (cols - 20);
-	double y_ratio = (double) img->get_height() / (rows - 20);
-	double scale = min (x_ratio, y_ratio);
-
-	/* background */
-
-	context->set_source_rgb (0.764, 0.882, 0.882);
-	context->paint ();
-
-	/* image */
-
-	context->save ();
-	context->translate (5, 5);
-	context->scale (scale, scale);
-	context->set_source (img, 0, 0);
-	context->paint ();
-	context->restore ();
-
-	/* text */
-
-	Glib::RefPtr<Pango::Layout> some_text = Pango::Layout::create (context);
-
-	Pango::FontDescription fd ("Sans 38");
-	some_text->set_font_description (fd);
-	some_text->set_text (string_compose ("%1 %2", PROGRAM_NAME, VERSIONSTRING));
-
-	context->move_to (200, 10);
-	context->set_source_rgb (0, 0, 0);
-	some_text->update_from_cairo_context (context);
-	some_text->show_in_cairo_context (context);
-
-	Pango::FontDescription fd2 ("Sans Italic 18");
-	some_text->set_font_description (fd2);
-	some_text->set_text (_("Ableton Push 2 Support"));
-
-	context->move_to (200, 80);
-	context->set_source_rgb (0, 0, 0);
-	some_text->update_from_cairo_context (context);
-	some_text->show_in_cairo_context (context);
-
-	splash_start = get_microseconds ();
-	blit_to_device_frame_buffer ();
-}
-
 bool
 Push2::pad_filter (MidiBuffer& in, MidiBuffer& out) const
 {
@@ -1269,7 +1157,7 @@ Push2::pad_filter (MidiBuffer& in, MidiBuffer& out) const
 
 				matched = true;
 			}
-		} else if ((*ev).is_pitch_bender() || (*ev).is_aftertouch() || (*ev).is_channel_pressure()) {
+		} else if ((*ev).is_pitch_bender() || (*ev).is_poly_pressure() || (*ev).is_channel_pressure()) {
 			out.push_back (*ev);
 		}
 	}
@@ -1277,10 +1165,51 @@ Push2::pad_filter (MidiBuffer& in, MidiBuffer& out) const
 	return matched;
 }
 
+void
+Push2::port_registration_handler ()
+{
+	if (!_async_in && !_async_out) {
+		/* ports not registered yet */
+		return;
+	}
+
+	if (_async_in->connected() && _async_out->connected()) {
+		/* don't waste cycles here */
+		return;
+	}
+
+#ifdef __APPLE__
+	/* the origin of the numeric magic identifiers is known only to Ableton
+	   and may change in time. This is part of how CoreMIDI works.
+	*/
+	string input_port_name = X_("system:midi_capture_1319078870");
+	string output_port_name = X_("system:midi_playback_3409210341");
+#else
+	string input_port_name = X_("Ableton Push 2 MIDI 1 in");
+	string output_port_name = X_("Ableton Push 2 MIDI 1 out");
+#endif
+	vector<string> in;
+	vector<string> out;
+
+	AudioEngine::instance()->get_ports (string_compose (".*%1", input_port_name), DataType::MIDI, PortFlags (IsPhysical|IsOutput), in);
+	AudioEngine::instance()->get_ports (string_compose (".*%1", output_port_name), DataType::MIDI, PortFlags (IsPhysical|IsInput), out);
+
+	if (!in.empty() && !out.empty()) {
+		cerr << "Push2: both ports found\n";
+		cerr << "\tconnecting to " << in.front() <<  " + " << out.front() << endl;
+		if (!_async_in->connected()) {
+			AudioEngine::instance()->connect (_async_in->name(), in.front());
+		}
+		if (!_async_out->connected()) {
+			AudioEngine::instance()->connect (_async_out->name(), out.front());
+		}
+	}
+}
+
 bool
 Push2::connection_handler (boost::weak_ptr<ARDOUR::Port>, std::string name1, boost::weak_ptr<ARDOUR::Port>, std::string name2, bool yn)
 {
-	DEBUG_TRACE (DEBUG::FaderPort, "FaderPort::connection_handler  start\n");
+	DEBUG_TRACE (DEBUG::FaderPort, "FaderPort::connection_handler start\n");
 	if (!_input_port || !_output_port) {
 		return false;
 	}
@@ -1301,11 +1230,14 @@ Push2::connection_handler (boost::weak_ptr<ARDOUR::Port>, std::string name1, boo
 			connection_state &= ~OutputConnected;
 		}
 	} else {
-		DEBUG_TRACE (DEBUG::FaderPort, string_compose ("Connections between %1 and %2 changed, but I ignored it\n", name1, name2));
+		DEBUG_TRACE (DEBUG::Push2, string_compose ("Connections between %1 and %2 changed, but I ignored it\n", name1, name2));
 		/* not our ports */
 		return false;
 	}
 
+	DEBUG_TRACE (DEBUG::Push2, string_compose ("our ports changed connection state: %1 -> %2 connected ? %3\n",
+	                                           name1, name2, yn));
+
 	if ((connection_state & (InputConnected|OutputConnected)) == (InputConnected|OutputConnected)) {
 
 		/* XXX this is a horrible hack. Without a short sleep here,
@@ -1314,11 +1246,19 @@ Push2::connection_handler (boost::weak_ptr<ARDOUR::Port>, std::string name1, boo
 		*/
 
 		g_usleep (100000);
-                DEBUG_TRACE (DEBUG::FaderPort, "device now connected for both input and output\n");
-                // connected ();
+                DEBUG_TRACE (DEBUG::Push2, "device now connected for both input and output\n");
+
+                /* may not have the device open if it was just plugged
+                   in. Really need USB device detection rather than MIDI port
+                   detection for this to work well.
+                */
+
+                device_acquire ();
+                begin_using_device ();
 
 	} else {
 		DEBUG_TRACE (DEBUG::FaderPort, "Device disconnected (input or output or both) or not yet fully connected\n");
+		stop_using_device ();
 	}
 
 	ConnectionChange (); /* emit signal for our GUI */
@@ -1340,16 +1280,6 @@ Push2::input_port()
 	return _async_in;
 }
 
-void
-Push2::build_pad_table ()
-{
-	for (int n = 36; n < 100; ++n) {
-		pad_map[n] = n + (octave_shift*12);
-	}
-
-	PadChange (); /* emit signal */
-}
-
 int
 Push2::pad_note (int row, int col) const
 {
@@ -1362,6 +1292,27 @@ Push2::pad_note (int row, int col) const
 	return 0;
 }
 
+void
+Push2::update_selection_color ()
+{
+	boost::shared_ptr<MidiTrack> current_midi_track = current_pad_target.lock();
+
+	if (!current_midi_track) {
+		return;
+	}
+
+	selection_color = get_color_index (current_midi_track->presentation_info().color());
+	contrast_color = get_color_index (ArdourCanvas::HSV (current_midi_track->presentation_info().color()).opposite().color());
+
+	reset_pad_colors ();
+}
+
+void
+Push2::reset_pad_colors ()
+{
+	set_pad_scale (_scale_root, _root_octave, _mode, _in_key);
+}
+
 void
 Push2::set_pad_scale (int root, int octave, MusicalMode::Type mode, bool inkey)
 {
@@ -1406,10 +1357,13 @@ Push2::set_pad_scale (int root, int octave, MusicalMode::Type mode, bool inkey)
 		}
 	}
 
+	fn_pad_map.clear ();
+
 	if (inkey) {
 
 		vector<int>::iterator notei;
 		int row_offset = 0;
+
 		for (int row = 0; row < 8; ++row) {
 
 			/* Ableton's grid layout wraps the available notes in the scale
@@ -1429,9 +1383,11 @@ Push2::set_pad_scale (int root, int octave, MusicalMode::Type mode, bool inkey)
 					notenum = *notei;
 					pad->filtered = notenum;
 
+					fn_pad_map.insert (make_pair (notenum, pad));
+
 					if ((notenum % 12) == original_root) {
-						pad->set_color (LED::Green);
-						pad->perma_color = LED::Green;
+						pad->set_color (selection_color);
+						pad->perma_color = selection_color;
 					} else {
 						pad->set_color (LED::White);
 						pad->perma_color = LED::White;
@@ -1447,6 +1403,7 @@ Push2::set_pad_scale (int root, int octave, MusicalMode::Type mode, bool inkey)
 					pad->filtered = -1;
 				}
 
+				pad->set_state (LED::OneShot24th);
 				write (pad->state_msg());
 			}
 		}
@@ -1465,11 +1422,13 @@ Push2::set_pad_scale (int root, int octave, MusicalMode::Type mode, bool inkey)
 
 			pad->filtered = root_start + (note - 36);
 
+			fn_pad_map.insert (make_pair (pad->filtered, pad));
+
 			if (mode_map.find (note) != mode_map.end()) {
 
 				if ((note % 12) == original_root) {
-					pad->set_color (LED::Green);
-					pad->perma_color = LED::Green;
+					pad->set_color (selection_color);
+					pad->perma_color = selection_color;
 				} else {
 					pad->set_color (LED::White);
 					pad->perma_color = LED::White;
@@ -1486,18 +1445,35 @@ Push2::set_pad_scale (int root, int octave, MusicalMode::Type mode, bool inkey)
 
 			}
 
+			pad->set_state (LED::OneShot24th);
 			write (pad->state_msg());
 		}
 	}
 
-	PadChange (); /* EMIT SIGNAL */
-
 	/* store state */
 
-	_scale_root = original_root;
-	_root_octave = octave;
-	_in_key = inkey;
-	_mode = mode;
+	bool changed = false;
+
+	if (_scale_root != original_root) {
+		_scale_root = original_root;
+		changed = true;
+	}
+	if (_root_octave != octave) {
+		_root_octave = octave;
+		changed = true;
+	}
+	if (_in_key != inkey) {
+		_in_key = inkey;
+		changed = true;
+	}
+	if (_mode != mode) {
+		_mode = mode;
+		changed = true;
+	}
+
+	if (changed) {
+		ScaleChange (); /* EMIT SIGNAL */
+	}
 }
 
 void
@@ -1512,6 +1488,8 @@ Push2::set_percussive_mode (bool yn)
 
 	int drum_note = 36;
 
+	fn_pad_map.clear ();
+
 	for (int row = 0; row < 8; ++row) {
 
 		for (int col = 0; col < 4; ++col) {
@@ -1537,8 +1515,6 @@ Push2::set_percussive_mode (bool yn)
 	}
 
 	percussion = true;
-
-	PadChange (); /* EMIT SIGNAL */
 }
 
 Push2Layout*
@@ -1566,12 +1542,6 @@ Push2::stripable_selection_change (StripableNotificationListPtr selected)
 		}
 	}
 
-	if (new_pad_target) {
-		cerr << "new midi pad target " << new_pad_target->name() << endl;
-	} else {
-		cerr << "no midi pad target\n";
-	}
-
 	if (current_midi_track == new_pad_target) {
 		/* nothing to do */
 		return;
@@ -1585,7 +1555,14 @@ Push2::stripable_selection_change (StripableNotificationListPtr selected)
 	/* disconnect from pad port, if appropriate */
 
 	if (current_midi_track && pad_port) {
-		cerr << "Disconnect pads from " << current_midi_track->name() << endl;
+
+		/* XXX this could possibly leave dangling MIDI notes.
+		 *
+		 * A general libardour fix is required. It isn't obvious
+		 * how note resolution can be done unless disconnecting
+		 * becomes "slow" (i.e. deferred for as long as it takes
+		 * to resolve notes).
+		 */
 		current_midi_track->input()->disconnect (current_midi_track->input()->nth(0), pad_port->name(), this);
 	}
 
@@ -1594,12 +1571,17 @@ Push2::stripable_selection_change (StripableNotificationListPtr selected)
 	 */
 
 	if (new_pad_target && pad_port) {
-		cerr << "Reconnect pads to " << new_pad_target->name() << endl;
 		new_pad_target->input()->connect (new_pad_target->input()->nth (0), pad_port->name(), this);
 		current_pad_target = new_pad_target;
+		selection_color = get_color_index (new_pad_target->presentation_info().color());
+		contrast_color = get_color_index (ArdourCanvas::HSV (new_pad_target->presentation_info().color()).opposite().color());
 	} else {
 		current_pad_target.reset ();
+		selection_color = LED::Green;
+		contrast_color = LED::Green;
 	}
+
+	reset_pad_colors ();
 }
 
 Push2::Button*
@@ -1607,3 +1589,179 @@ Push2::button_by_id (ButtonID bid)
 {
 	return id_button_map[bid];
 }
+
+uint8_t
+Push2::get_color_index (ArdourCanvas::Color rgba)
+{
+	ColorMap::iterator i = color_map.find (rgba);
+
+	if (i != color_map.end()) {
+		return i->second;
+	}
+
+	double dr, dg, db, da;
+	int r, g, b;
+	ArdourCanvas::color_to_rgba (rgba, dr, dg, db, da);
+	int w = 126; /* not sure where/when we should get this value */
+
+
+	r = (int) floor (255.0 * dr);
+	g = (int) floor (255.0 * dg);
+	b = (int) floor (255.0 * db);
+
+	/* get a free index */
+
+	uint8_t index;
+
+	if (color_map_free_list.empty()) {
+		/* random replacement of any entry above zero and below 122 (where the
+		 * Ableton standard colors live)
+		 */
+		index = 1 + (random() % 121);
+	} else {
+		index = color_map_free_list.top();
+		color_map_free_list.pop();
+	}
+
+	MidiByteArray palette_msg (17,
+	                           0xf0,
+	                           0x00 , 0x21, 0x1d, 0x01, 0x01, 0x03, /* reset palette header */
+	                           0x00, /* index = 7 */
+	                           0x00, 0x00, /* r = 8 & 9 */
+	                           0x00, 0x00, /* g = 10 & 11 */
+	                           0x00, 0x00, /* b = 12 & 13 */
+	                           0x00, 0x00, /* w (a?) = 14 & 15*/
+	                           0xf7);
+	palette_msg[7] = index;
+	palette_msg[8] = r & 0x7f;
+	palette_msg[9] = (r & 0x80) >> 7;
+	palette_msg[10] = g & 0x7f;
+	palette_msg[11] = (g & 0x80) >> 7;
+	palette_msg[12] = b & 0x7f;
+	palette_msg[13] = (b & 0x80) >> 7;
+	palette_msg[14] = w & 0x7f;
+	palette_msg[15] = w & 0x80;
+
+	write (palette_msg);
+
+	MidiByteArray update_pallette_msg (8, 0xf0, 0x00, 0x21, 0x1d, 0x01, 0x01, 0x05, 0xF7);
+	write (update_pallette_msg);
+
+	color_map[rgba] = index;
+
+	return index;
+}
+
+void
+Push2::build_color_map ()
+{
+	/* These are "standard" colors that Ableton docs suggest will always be
+	   there. Put them in our color map so that when we look up these
+	   colors, we will use the Ableton indices for them.
+	*/
+
+	color_map.insert (make_pair (RGB_TO_UINT (0,0,0), 0));
+	color_map.insert (make_pair (RGB_TO_UINT (204,204,204), 122));
+	color_map.insert (make_pair (RGB_TO_UINT (64,64,64), 123));
+	color_map.insert (make_pair (RGB_TO_UINT (20,20,20), 124));
+	color_map.insert (make_pair (RGB_TO_UINT (0,0,255), 125));
+	color_map.insert (make_pair (RGB_TO_UINT (0,255,0), 126));
+	color_map.insert (make_pair (RGB_TO_UINT (255,0,0), 127));
+
+	for (uint8_t n = 1; n < 122; ++n) {
+		color_map_free_list.push (n);
+	}
+}
+
+void
+Push2::fill_color_table ()
+{
+	colors.insert (make_pair (DarkBackground, ArdourCanvas::rgba_to_color (0, 0, 0, 1)));
+	colors.insert (make_pair (LightBackground, ArdourCanvas::rgba_to_color (0.98, 0.98, 0.98, 1)));
+
+	colors.insert (make_pair (ParameterName, ArdourCanvas::rgba_to_color (0.98, 0.98, 0.98, 1)));
+
+	colors.insert (make_pair (KnobArcBackground, ArdourCanvas::rgba_to_color (0.3, 0.3, 0.3, 1.0)));
+	colors.insert (make_pair (KnobArcStart, ArdourCanvas::rgba_to_color (1.0, 0.0, 0.0, 1.0)));
+	colors.insert (make_pair (KnobArcEnd, ArdourCanvas::rgba_to_color (0.0, 1.0, 0.0, 1.0)));
+
+	colors.insert (make_pair (KnobLineShadow, ArdourCanvas::rgba_to_color  (0, 0, 0, 0.3)));
+	colors.insert (make_pair (KnobLine, ArdourCanvas::rgba_to_color (1, 1, 1, 1)));
+
+	colors.insert (make_pair (KnobForeground, ArdourCanvas::rgba_to_color (0.2, 0.2, 0.2, 1)));
+	colors.insert (make_pair (KnobBackground, ArdourCanvas::rgba_to_color (0.2, 0.2, 0.2, 1)));
+	colors.insert (make_pair (KnobShadow, ArdourCanvas::rgba_to_color (0, 0, 0, 0.1)));
+	colors.insert (make_pair (KnobBorder, ArdourCanvas::rgba_to_color (0, 0, 0, 1)));
+
+}
+
+ArdourCanvas::Color
+Push2::get_color (ColorName name)
+{
+	Colors::iterator c = colors.find (name);
+	if (c != colors.end()) {
+		return c->second;
+	}
+
+	return random();
+}
+
+void
+Push2::set_current_layout (Push2Layout* layout)
+{
+	if (layout && layout == _current_layout) {
+		_current_layout->show ();
+	} else {
+
+		if (_current_layout) {
+			_current_layout->hide ();
+			_canvas->root()->remove (_current_layout);
+			_previous_layout = _current_layout;
+		}
+
+		_current_layout = layout;
+
+		if (_current_layout) {
+			_canvas->root()->add (_current_layout);
+			_current_layout->show ();
+		}
+
+
+		_canvas->request_redraw ();
+	}
+}
+
+void
+Push2::use_previous_layout ()
+{
+	if (_previous_layout) {
+		set_current_layout (_previous_layout);
+	}
+}
+
+void
+Push2::request_pressure_mode ()
+{
+	MidiByteArray msg (8, 0xF0, 0x00, 0x21, 0x1D, 0x01, 0x01, 0x1F, 0xF7);
+	write (msg);
+}
+
+void
+Push2::set_pressure_mode (PressureMode pm)
+{
+	MidiByteArray msg (9, 0xF0, 0x00, 0x21, 0x1D, 0x01, 0x01, 0x1E, 0x0, 0xF7);
+
+	switch (pm) {
+	case AfterTouch:
+		/* nothing to do, message is correct */
+		break;
+	case PolyPressure:
+		msg[7] = 0x1;
+		break;
+	default:
+		return;
+	}
+
+	write (msg);
+	cerr << "Sent PM message " << msg << endl;
+}