CLAP: add macro to use MIDI MPE dialect (#443)

* CLAP: add macro to use MIDI MPE dialect

* Change MIDI MPE as a generic macro

distrho/DistrhoInfo.hpp

@@ -565,6 +565,12 @@ START_NAMESPACE_DISTRHO
  */
 #define DISTRHO_PLUGIN_WANT_MIDI_OUTPUT 1
 
+/**
+   Whether the plugin uses MIDI MPE for MIDI input and MIDI output.
+   @note Only CLAP implements this macro at the moment
+*/
+#define DISTRHO_PLUGIN_MIDI_MPE 0
+
 /**
    Whether the plugin wants to change its own parameter inputs.@n
    Not all hosts or plugin formats support this,

distrho/src/DistrhoPluginCLAP.cpp

@@ -67,6 +67,12 @@
 # define DPF_CLAP_TIMER_INTERVAL 16 /* ~60 fps */
 #endif
 
+#if defined(DISTRHO_PLUGIN_MIDI_MPE) && DISTRHO_PLUGIN_MIDI_MPE
+# define DPF_CLAP_NOTE_DIALECT CLAP_NOTE_DIALECT_MIDI_MPE
+#else
+# define DPF_CLAP_NOTE_DIALECT CLAP_NOTE_DIALECT_MIDI
+#endif
+
 START_NAMESPACE_DISTRHO
 
 // --------------------------------------------------------------------------------------------------------------------
@@ -2286,8 +2292,8 @@ static bool CLAP_ABI clap_plugin_note_ports_get(const clap_plugin_t*, uint32_t,
     {
        #if DISTRHO_PLUGIN_WANT_MIDI_INPUT
         info->id = 0;
-        info->supported_dialects = CLAP_NOTE_DIALECT_MIDI;
-        info->preferred_dialect = CLAP_NOTE_DIALECT_MIDI;
+        info->supported_dialects = DPF_CLAP_NOTE_DIALECT;
+        info->preferred_dialect = DPF_CLAP_NOTE_DIALECT;
         std::strcpy(info->name, "Event/MIDI Input");
         return true;
        #endif
@@ -2296,8 +2302,8 @@ static bool CLAP_ABI clap_plugin_note_ports_get(const clap_plugin_t*, uint32_t,
     {
        #if DISTRHO_PLUGIN_WANT_MIDI_OUTPUT
         info->id = 0;
-        info->supported_dialects = CLAP_NOTE_DIALECT_MIDI;
-        info->preferred_dialect = CLAP_NOTE_DIALECT_MIDI;
+        info->supported_dialects = DPF_CLAP_NOTE_DIALECT;
+        info->preferred_dialect = DPF_CLAP_NOTE_DIALECT;
         std::strcpy(info->name, "Event/MIDI Output");
         return true;
        #endif