Add a MIDI mapping editor for Futatabi.

[nageru] / shared / midi_mapper_util.h

diff --git a/shared/midi_mapper_util.h b/shared/midi_mapper_util.h
index bc9b1bf164c83921a44c74b897eb52d7f2005e45..c9c96bb9516dbd31cf81699b144d19449a0b84eb 100644 (file)
--- a/shared/midi_mapper_util.h
+++ b/shared/midi_mapper_util.h
@@ -2,35 +2,48 @@
 #define _MIDI_MAPPER_UTIL_H 1
 
 #include "midi_mapping.pb.h"
+#include "shared/midi_device.h"
 
 #include <google/protobuf/descriptor.h>
 
 template <class Proto>
-inline bool match_controller_helper(const Proto &msg, int field_number, int controller)
+inline int get_controller_mapping_helper(const Proto &msg, int field_number, int default_value)
 {
        using namespace google::protobuf;
        const FieldDescriptor *descriptor = msg.GetDescriptor()->FindFieldByNumber(field_number);
        const Reflection *reflection = msg.GetReflection();
        if (!reflection->HasField(msg, descriptor)) {
-               return false;
+               return default_value;
        }
        const MIDIControllerProto &controller_proto =
                static_cast<const MIDIControllerProto &>(reflection->GetMessage(msg, descriptor));
-       return (controller_proto.controller_number() == controller);
+       return controller_proto.controller_number();
 }
 
 template <class Proto>
-inline bool match_button_helper(const Proto &msg, int field_number, int note)
+inline bool match_controller_helper(const Proto &msg, int field_number, int controller)
+{
+       return (get_controller_mapping_helper(msg, field_number, -1) == controller);
+}
+
+template <class Proto>
+inline int get_button_mapping_helper(const Proto &msg, int field_number, int default_value)
 {
        using namespace google::protobuf;
        const FieldDescriptor *descriptor = msg.GetDescriptor()->FindFieldByNumber(field_number);
        const Reflection *reflection = msg.GetReflection();
        if (!reflection->HasField(msg, descriptor)) {
-               return false;
+               return default_value;
        }
        const MIDIButtonProto &button_proto =
                static_cast<const MIDIButtonProto &>(reflection->GetMessage(msg, descriptor));
-       return (button_proto.note_number() == note);
+       return button_proto.note_number();
+}
+
+template <class Proto>
+inline bool match_button_helper(const Proto &msg, int field_number, int note)
+{
+       return (get_button_mapping_helper(msg, field_number, -1) == note);
 }
 
 template <class Proto>
@@ -46,4 +59,55 @@ inline bool match_bank_helper(const Proto &msg, int bank_field_number, int bank)
        return reflection->GetInt32(msg, bank_descriptor) == bank;
 }
 
+template <class Proto>
+inline MIDILightProto get_light_mapping_helper(const Proto &msg, int field_number)
+{
+       using namespace google::protobuf;
+       const FieldDescriptor *descriptor = msg.GetDescriptor()->FindFieldByNumber(field_number);
+       const Reflection *reflection = msg.GetReflection();
+       if (!reflection->HasField(msg, descriptor)) {
+               return MIDILightProto();
+       }
+       return static_cast<const MIDILightProto &>(reflection->GetMessage(msg, descriptor));
+}
+
+// Find what MIDI note the given light (as given by field_number) is mapped to, and enable it.
+template <class Proto>
+void activate_mapped_light(const Proto &msg, int field_number, std::map<MIDIDevice::LightKey, uint8_t> *active_lights)
+{
+       MIDILightProto light_proto = get_light_mapping_helper(msg, field_number);
+       if (!light_proto.has_note_number()) {
+               return;
+       }
+       active_lights->emplace(MIDIDevice::LightKey{MIDIDevice::LightKey::NOTE, unsigned(light_proto.note_number())},
+               light_proto.velocity());
+}
+
+inline double map_controller_to_float(int controller, int val)
+{
+       if (controller == MIDIReceiver::PITCH_BEND_CONTROLLER) {
+               // We supposedly go from -8192 to 8191 (inclusive), but there are
+               // controllers that only have 10-bit precision and do the upconversion
+               // to 14-bit wrong (just padding with zeros), making 8176 the highest
+               // attainable value. We solve this by making the effective range
+               // -8176..8176 (inclusive).
+               if (val <= -8176) {
+                       return 0.0;
+               } else if (val >= 8176) {
+                       return 1.0;
+               } else {
+                       return 0.5 * (double(val) / 8176.0) + 0.5;
+               }
+       }
+
+       // Slightly hackish mapping so that we can represent exactly 0.0, 0.5 and 1.0.
+       if (val <= 0) {
+               return 0.0;
+       } else if (val >= 127) {
+               return 1.0;
+       } else {
+               return (val + 0.5) / 127.0;
+       }
+}
+
 #endif  // !defined(_MIDI_MAPPER_UTIL_H)