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Diffstat (limited to 'src/lv2_gui.cc')
| -rw-r--r-- | src/lv2_gui.cc | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/src/lv2_gui.cc b/src/lv2_gui.cc new file mode 100644 index 0000000..858e097 --- /dev/null +++ b/src/lv2_gui.cc @@ -0,0 +1,237 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/*************************************************************************** + * lv2.cc + * + * Wed Jul 13 13:50:33 CEST 2011 + * Copyright 2011 Bent Bisballe Nyeng + * deva@aasimon.org + ****************************************************************************/ + +/* + * This file is part of DrumGizmo. + * + * DrumGizmo 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. + * + * DrumGizmo 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 DrumGizmo; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ +#include "lv2_gui.h" + +#include <stdio.h> +#include <string.h> + +#include <lv2/lv2plug.in/ns/ext/instance-access/instance-access.h> +#include <lv2/lv2plug.in/ns/extensions/ui/ui.h> + +#include "lv2_instance.h" + +// From: http://codesearch.google.com/#50sg5qT6WNE/src/lv2_ui_dssi.c +// git://repo.or.cz/nekobee.git/src/lv2_ui_dssi.c + +#define DRUMGIZMO_UI_URI "http://drumgizmo.org/lv2-gui" + +#include <plugingui.h> + +/** + * When LV2_EXTERNAL_UI_URI UI is instantiated, the returned + * LV2UI_Widget handle must be cast to pointer to struct lv2_external_ui. + * UI is created in invisible state. + */ +struct lv2_external_ui +{ + /** + * Host calls this function regulary. UI library implementing the + * callback may do IPC or redraw the UI. + * + * @param _this_ the UI context + */ + void (* run)(struct lv2_external_ui * _this_); + + /** + * Host calls this function to make the plugin UI visible. + * + * @param _this_ the UI context + */ + void (* show)(struct lv2_external_ui * _this_); + + /** + * Host calls this function to make the plugin UI invisible again. + * + * @param _this_ the UI context + */ + void (* hide)(struct lv2_external_ui * _this_); +}; + +/** UI extension suitable for out-of-process UIs */ +#define LV2_EXTERNAL_UI_URI "http://lv2plug.in/ns/extensions/ui#external" + +/** + * On UI instantiation, host must supply LV2_EXTERNAL_UI_URI + * feature. LV2_Feature::data must be pointer to struct lv2_external_ui_host. */ +struct lv2_external_ui_host +{ + /** + * Callback that plugin UI will call + * when UI (GUI window) is closed by user. + * This callback wil; be called during execution of lv2_external_ui::run() + * (i.e. not from background thread). + * + * After this callback is called, UI is defunct. Host must call + * LV2UI_Descriptor::cleanup(). If host wants to make the UI visible + * again UI must be reinstantiated. + * + * @param controller Host context associated with plugin UI, as + * supplied to LV2UI_Descriptor::instantiate() + */ + void (* ui_closed)(LV2UI_Controller controller); + + /** + * Optional (may be NULL) "user friendly" identifier which the UI + * may display to allow a user to easily associate this particular + * UI instance with the correct plugin instance as it is represented + * by the host (e.g. "track 1" or "channel 4"). + * + * If supplied by host, the string will be referenced only during + * LV2UI_Descriptor::instantiate() + */ + const char * plugin_human_id; +}; + +struct DG_GUI { + struct lv2_external_ui virt; + + LV2_Handle instance_handle; + LV2_Extension_Data_Feature *data_access; + DrumGizmo *instance; + LV2UI_Controller controller; + + GUI::PluginGUI *gui; + struct lv2_external_ui_host *ui_host_ptr; +}; + +static void ui_run(struct lv2_external_ui * _this_) +{ + struct DG_GUI *dggui = (struct DG_GUI *)_this_; + dggui->gui->processEvents(); +} + +static void ui_show(struct lv2_external_ui * _this_) +{ + struct DG_GUI *dggui = (struct DG_GUI *)_this_; + dggui->gui->show(); +} + +static void ui_hide(struct lv2_external_ui * _this_) +{ + struct DG_GUI *dggui = (struct DG_GUI *)_this_; + if(dggui->gui) dggui->gui->hide(); +} + +static void closeHandler(void *ptr) +{ + struct DG_GUI *gui = (struct DG_GUI *)ptr; + + if(gui->ui_host_ptr && gui->ui_host_ptr->ui_closed) { + gui->ui_host_ptr->ui_closed(gui->controller); + } + + delete gui->gui; + gui->gui = NULL; +} + +static LV2UI_Handle ui_instantiate(const struct _LV2UI_Descriptor * descriptor, + const char * plugin_uri, + const char * bundle_path, + LV2UI_Write_Function write_function, + LV2UI_Controller controller, + LV2UI_Widget * widget, + const LV2_Feature * const * features) +{ + printf("ui_instantiate\n"); + + struct DG_GUI* pt = new struct DG_GUI; + + pt->ui_host_ptr = NULL; + pt->controller = controller; + + while (*features != NULL) { + std::string uri = (*features)->URI; + void *data = (*features)->data; + + printf("DGUI: feature: %s\n", uri.c_str()); + + if(uri == LV2_INSTANCE_ACCESS_URI) { + pt->instance_handle = data; + } + + if(uri == LV2_DATA_ACCESS_URI) { + pt->data_access = (LV2_Extension_Data_Feature *)data; + } + + if(uri == LV2_EXTERNAL_UI_URI) { + pt->ui_host_ptr = (struct lv2_external_ui_host *)data; + } + features++; + } + + LV2_DrumGizmo_Descriptor *dgd = + (LV2_DrumGizmo_Descriptor *)(*pt->data_access->data_access)(PLUGIN_INSTANCE_URI); + + pt->instance = dgd->get_pci(pt->instance_handle); + pt->virt.run = ui_run; + pt->virt.show = ui_show; + pt->virt.hide = ui_hide; + pt->gui = new GUI::PluginGUI(); + pt->gui->setWindowClosedCallback(closeHandler, pt); + + *widget = (LV2UI_Widget)pt; + + return pt; +} + +static void ui_cleanup(LV2UI_Handle ui) +{ + struct DG_GUI* pt = (struct DG_GUI*)ui; + delete pt->gui; + pt->gui = NULL; + delete pt; +} + +static void ui_port_event(LV2UI_Handle ui, + uint32_t port_index, + uint32_t buffer_size, + uint32_t format, + const void * buffer) +{ +} + +#ifdef __cplusplus +extern "C" { +#endif + +static LV2UI_Descriptor descriptor = { + DRUMGIZMO_UI_URI, + ui_instantiate, + ui_cleanup, + ui_port_event, + NULL +}; + +const LV2UI_Descriptor *lv2ui_descriptor(uint32_t index) +{ + if(index == 0) return &descriptor; + return NULL; +} + +#ifdef __cplusplus +} +#endif |