UI query state on GUI realization

lv2.c

@@ -190,17 +190,8 @@ work(LV2_Handle                  instance,
   return LV2_WORKER_SUCCESS;
 }
 
-static LV2_Worker_Status
-work_response(LV2_Handle  instance,
-              uint32_t    size,
-              const void* data)
-{
-  // swap engine instances
+static void inform_ui(LV2_Handle instance) {
   convoLV2* self = (convoLV2*)instance;
-  LV2convolv *old  = self->clv_online;
-  self->clv_online  = self->clv_offline;
-  self->clv_offline = old;
-
   // message to UI
   char fn[1024];
   if (clv_query_setting(self->clv_online, "convolution.ir.file", fn, 1024) > 0) {
@@ -220,6 +211,20 @@ work_response(LV2_Handle  instance,
     free(cfg);
   }
 #endif
+}
+
+static LV2_Worker_Status
+work_response(LV2_Handle  instance,
+              uint32_t    size,
+              const void* data)
+{
+  // swap engine instances
+  convoLV2* self = (convoLV2*)instance;
+  LV2convolv *old  = self->clv_online;
+  self->clv_online  = self->clv_offline;
+  self->clv_offline = old;
+
+  inform_ui(instance);
 
   int d = CMD_FREE;
   self->schedule->schedule_work(self->schedule->handle, sizeof(int), &d);
@@ -283,7 +288,13 @@ run(LV2_Handle instance, uint32_t n_samples)
 
   /* Read incoming events */
   LV2_ATOM_SEQUENCE_FOREACH(self->control_port, ev) {
-    self->schedule->schedule_work(self->schedule->handle, lv2_atom_total_size(&ev->body), &ev->body);
+    const LV2_Atom_Object* obj = (LV2_Atom_Object*)&ev->body;
+    ConvoLV2URIs* uris = &self->uris;
+    if (obj->body.otype == uris->clv2_uiinit) {
+      inform_ui(instance);
+    } else {
+      self->schedule->schedule_work(self->schedule->handle, lv2_atom_total_size(&ev->body), &ev->body);
+    }
   }
 
   if (self->bufsize != n_samples) {

ui.c

@@ -146,6 +146,20 @@ instantiate(const LV2UI_Descriptor*   descriptor,
 
 	*widget = ui->box;
 
+#if 1 //ask plugin about current state
+	uint8_t obj_buf[OBJ_BUF_SIZE];
+	lv2_atom_forge_set_buffer(&ui->forge, obj_buf, OBJ_BUF_SIZE);
+
+	LV2_Atom_Forge_Frame set_frame;
+	LV2_Atom* msg = (LV2_Atom*)lv2_atom_forge_blank(
+		&ui->forge, &set_frame, 1, ui->uris.clv2_uiinit);
+	lv2_atom_forge_pop(&ui->forge, &set_frame);
+
+	ui->write(ui->controller, 0, lv2_atom_total_size(msg),
+	          ui->uris.atom_eventTransfer,
+	          msg);
+#endif
+
 	return ui;
 }
 

uris.h

@@ -30,6 +30,7 @@
 #define CONVOLV2__file        CONVOLV2_URI "#file"
 #define CONVOLV2__load        CONVOLV2_URI "#load"
 #define CONVOLV2__state       CONVOLV2_URI "#state"
+#define CONVOLV2__uiinit      CONVOLV2_URI "#uiinit"
 
 typedef struct {
 	LV2_URID atom_Blank;
@@ -42,6 +43,7 @@ typedef struct {
 
 	LV2_URID clv2_ir_file;
 	LV2_URID clv2_state;
+	LV2_URID clv2_uiinit;
 } ConvoLV2URIs;
 
 static inline void
@@ -57,6 +59,7 @@ map_convolv2_uris(LV2_URID_Map* map, ConvoLV2URIs* uris)
 
 	uris->clv2_ir_file       = map->map(map->handle, CONVOLV2__file);
 	uris->clv2_state         = map->map(map->handle, CONVOLV2__state);
+	uris->clv2_uiinit        = map->map(map->handle, CONVOLV2__uiinit);
 }