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lv2_plugin_ui.cc

/*
    Copyright (C) 2008 Paul Davis 
    Author: Dave Robillard

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <ardour/insert.h>
#include <ardour/lv2_plugin.h>

#include "ardour_ui.h"
#include "lv2_plugin_ui.h"

using namespace Gtk;
using namespace ARDOUR;
using namespace PBD;

std::vector<struct lv2_external_ui*> g_external_uis;

void close_external_ui_windows()
{
      struct lv2_external_ui* external_ui_ptr;

      //cout << "close_external_ui_windows" << endl;

      while (!g_external_uis.empty()) {
            //cout << "pop" << endl;
            external_ui_ptr = g_external_uis.back();
            LV2_EXTERNAL_UI_HIDE(external_ui_ptr);
            g_external_uis.pop_back();
      }
}

void
LV2PluginUI::lv2_ui_write(LV2UI_Controller controller,
             uint32_t         port_index,
             uint32_t         buffer_size,
             uint32_t         format,
             const void*      buffer)
{
      //cout << "lv2_ui_write" << endl;
      LV2PluginUI* me = (LV2PluginUI*)controller;
      if (*(float*)buffer != me->_values[port_index]) {
            //cout << "set_parameter " << port_index << ":"  << *(float*)buffer << endl;
            me->_lv2->set_parameter(port_index, *(float*)buffer);
  }
}

void LV2PluginUI::on_external_ui_closed(LV2UI_Controller controller)
{
      //cout << "on_external_ui_closed" << endl;

      LV2PluginUI* me = (LV2PluginUI*)controller;
      me->_screen_update_connection.disconnect();
      //me->insert->set_gui(0);

      for (vector<struct lv2_external_ui*>::iterator it = g_external_uis.begin() ; it < g_external_uis.end(); it++) {
            if (*it == me->_external_ui_ptr) {
                  g_external_uis.erase(it);
            }
      }

      //slv2_ui_instance_get_descriptor(me->_inst)->cleanup(me->_inst);
      me->_external_ui_ptr = NULL;
}

void
LV2PluginUI::parameter_changed (uint32_t port_index, float val)
{
      //cout << "parameter_changed" << endl;
      if (val != _values[port_index]) {
            parameter_update(port_index, val);
      }
}

void
LV2PluginUI::parameter_update (uint32_t port_index, float val)
{
      if (!_inst) {
            return;
      }

      const LV2UI_Descriptor* ui_desc = slv2_ui_instance_get_descriptor(_inst);
      LV2UI_Handle ui_handle = slv2_ui_instance_get_handle(_inst);
      if (ui_desc->port_event) {
            //cout << "port_event " << port_index << ":" << val << endl;
            ui_desc->port_event(ui_handle, port_index, 4, 0, &val);
  }
      _values[port_index] = val;
}

bool
LV2PluginUI::start_updating(GdkEventAny* event)
{
      //cout << "start_updating" << endl;

      if (!_output_ports.empty()) {
            _screen_update_connection.disconnect();
            _screen_update_connection = ARDOUR_UI::instance()->RapidScreenUpdate.connect 
                  (mem_fun(*this, &LV2PluginUI::output_update));
      }
      return false;
}

bool
LV2PluginUI::stop_updating(GdkEventAny* event)
{
      //cout << "stop_updating" << endl;

      if (//!_external_ui_ptr &&
                  !_output_ports.empty()) {
            _screen_update_connection.disconnect();
      }
      return false;
}

void
LV2PluginUI::output_update()
{
      //cout << "output_update" << endl;
      if (_external_ui_ptr) {
            LV2_EXTERNAL_UI_RUN(_external_ui_ptr);
      }

      /* FIXME only works with control output ports (which is all we support now anyway) */
      uint32_t nports = _output_ports.size();
      for (uint32_t i = 0; i < nports; ++i) {
            uint32_t index = _output_ports[i];
            parameter_changed(index, _lv2->get_parameter(index));
      }
      
}

LV2PluginUI::LV2PluginUI (boost::shared_ptr<PluginInsert> pi, boost::shared_ptr<LV2Plugin> lv2p)
      : PlugUIBase (pi)
      , _lv2(lv2p)
      , _inst(NULL)
      , _values(NULL)
      , _external_ui_ptr(NULL)
{
      if (!_lv2->is_external_ui()) {
            lv2ui_instantiate("gtk2gui");
      }
}

void
LV2PluginUI::lv2ui_instantiate(const Glib::ustring& title)
{
      LV2_Feature** features;
      LV2_Feature** features_src;
      LV2_Feature** features_dst;
      size_t features_count;
      bool is_external_ui;

      is_external_ui = _lv2->is_external_ui();

      if (is_external_ui) {
            _external_ui_host.ui_closed = LV2PluginUI::on_external_ui_closed;
            _external_ui_host.plugin_human_id = strdup(title.c_str());

            _external_ui_feature.URI = LV2_EXTERNAL_UI_URI;
            _external_ui_feature.data = &_external_ui_host;

            features_src = features = (LV2_Feature**)_lv2->features();
            features_count = 2;
            while (*features++) {
                  features_count++;
            }

            features_dst = features = (LV2_Feature**)malloc(sizeof(LV2_Feature*) * features_count);
            features_dst[--features_count] = NULL;
            features_dst[--features_count] = &_external_ui_feature;
            while (features_count--) {
                  *features++ = *features_src++;
            }
      } else {
            features_dst = (LV2_Feature**)_lv2->features();
      }

      _inst = slv2_ui_instantiate(
                  _lv2->slv2_plugin(), _lv2->slv2_ui(), LV2PluginUI::lv2_ui_write, this,
                  features_dst);

      if (is_external_ui) {
            free(features_dst);
      }
                  
      uint32_t num_ports = slv2_plugin_get_num_ports(_lv2->slv2_plugin());
      for (uint32_t i = 0; i < num_ports; ++i) {
            if (_lv2->parameter_is_output(i) && _lv2->parameter_is_control(i) && is_update_wanted(i)) {
                  _output_ports.push_back(i);
            }
      }

      _external_ui_ptr = NULL;
      if (_inst) {
            if (!is_external_ui) {
                  GtkWidget* c_widget = (GtkWidget*)slv2_ui_instance_get_widget(_inst);
                  _gui_widget = Glib::wrap(c_widget);
                  _gui_widget->show_all();
                  pack_start(*_gui_widget, true, true);
            } else {
                  _external_ui_ptr = (struct lv2_external_ui *)slv2_ui_instance_get_widget(_inst);
                  g_external_uis.push_back(_external_ui_ptr);
            }
      }
      
      _values = new float[num_ports];
      for (uint32_t i = 0; i < num_ports; ++i) {
            bool ok;
            uint32_t port = _lv2->nth_parameter(i, ok);
            if (ok) {
                  _values[port] = _lv2->get_parameter(port);
                  if (_lv2->parameter_is_control(port) && _lv2->parameter_is_input(port)) {
                        parameter_update(port, _values[port]);
                  }
            }
      }
            
      _lv2->ParameterChanged.connect(mem_fun(*this, &LV2PluginUI::parameter_changed));
}

LV2PluginUI::~LV2PluginUI ()
{
      //cout << "LV2PluginUI destructor called" << endl;

      if (_values) {
            delete[] _values;
      }
      // plugin destructor destroys the GTK GUI
}

int
LV2PluginUI::get_preferred_height ()
{
      Gtk::Requisition r = size_request();
      return r.height;
}

int
LV2PluginUI::get_preferred_width ()
{
      Gtk::Requisition r = size_request();
      return r.width;
}

int
LV2PluginUI::package (Gtk::Window& win)
{
      //cout << "package" << endl;
      if (_external_ui_ptr) {
            _win_ptr = &win;
      } else {
            /* forward configure events to plugin window */
            win.signal_configure_event().connect (mem_fun (*this, &LV2PluginUI::configure_handler));
            win.signal_map_event().connect (mem_fun (*this, &LV2PluginUI::start_updating));
            win.signal_unmap_event().connect (mem_fun (*this, &LV2PluginUI::stop_updating));
      }
      return 0;
}

bool
LV2PluginUI::configure_handler (GdkEventConfigure* ev)
{
      cout << "CONFIGURE" << endl;
      return false;
}

bool
LV2PluginUI::is_update_wanted(uint32_t index)
{
      /* FIXME this should check the port notification properties, which nobody sets now anyway :) */
      return true;
}

bool
LV2PluginUI::on_window_show(const Glib::ustring& title)
{
      //cout << "on_window_show - " << title << endl; flush(cout);

      if (_lv2->is_external_ui()) {
            if (_external_ui_ptr) {
                  LV2_EXTERNAL_UI_SHOW(_external_ui_ptr);
                  return false;
            }
            lv2ui_instantiate(title);
            if (!_external_ui_ptr) {
                  return false;
            }

            LV2_EXTERNAL_UI_SHOW(_external_ui_ptr);
            _screen_update_connection.disconnect();
            _screen_update_connection = ARDOUR_UI::instance()->RapidScreenUpdate.connect 
                  (mem_fun(*this, &LV2PluginUI::output_update));
            return false;
      }

      return true;
}

void
LV2PluginUI::on_window_hide()
{
      //cout << "on_window_hide" << endl; flush(cout);

      if (_external_ui_ptr) {
            LV2_EXTERNAL_UI_HIDE(_external_ui_ptr);
            //slv2_ui_instance_get_descriptor(_inst)->cleanup(_inst);
            //_external_ui_ptr = NULL;
            //_screen_update_connection.disconnect();
      }
}

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