Add a track index track-info extension

include/clap/all.h

@@ -10,3 +10,4 @@
 #include "ext/draft/transport-control.h"
 #include "ext/draft/triggers.h"
 #include "ext/draft/tuning.h"
+#include "ext/draft/location.h"

include/clap/ext/draft/location.h

@@ -0,0 +1,54 @@
+#pragma once
+
+#include "../../plugin.h"
+#include "../../color.h"
+
+// This extension allows a host to tell the plugin more about its position 
+// within a project or session. 
+
+static CLAP_CONSTEXPR const char CLAP_EXT_LOCATION[] = "clap.location/1";
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum {
+   CLAP_PLUGIN_LOCATION_PROJECT,
+   CLAP_PLUGIN_LOCATION_TRACK,
+   CLAP_PLUGIN_LOCATION_TRACK_GROUP,
+   CLAP_PLUGIN_LOCATION_DEVICE
+   CLAP_PLUGIN_LOCATION_DEVICE_PARALLEL_GROUP,
+   CLAP_PLUGIN_LOCATION_DEVICE_SERIAL_GROUP,
+};
+
+typedef struct clap_plugin_location_element {
+   // Internal ID of the element. This is not intended for display to the user, 
+   // but rather to give the host a potential quick way for lookups.
+   const char *id;
+   // User friendly name of the element.
+   const char *name;
+   // Kind of the element, must be one of the CLAP_PLUGIN_LOCATION_* values.
+   int kind;
+   // Index within the parent element. 
+   uint32_t index_in_group;
+   // Index of the element in a global context. When sorting elements by this index, 
+   // the order should mirror the order as it is displayed in the host. 
+   uint32_t global_index;
+   // Color for this element, should be 0x00000000 if no color is used for this 
+   // element. 
+   clap_color_t color;
+} clap_plugin_location_element_t;
+
+
+typedef struct clap_plugin_location {
+   // Called by the host when the location of the plugin instance changes.
+   //
+   // The last item in this array always refers to the device itself, and as 
+   // such is expected to be of kind CLAP_PLUGIN_LOCATION_DEVICE. 
+   // [main-thread]
+   void (*set_location)(clap_plugin_t *plugin, clap_plugin_location_element_t *path, int num_elements);
+} clap_plugin_location_t;
+
+#ifdef __cplusplus
+}
+#endif