add channel aftertouch param to VST3 IPlug

pressplay-music · Jan 11, 2019 · 27475cf · 27475cf
1 parent 16a0485
commit 27475cf
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Showing 4 changed files with 58 additions and 2 deletions.
diff --git a/WDL/IPlug/IPlugStructs.cpp b/WDL/IPlug/IPlugStructs.cpp
@@ -28,6 +28,13 @@ void IMidiMsg::MakePitchWheelMsg(double value, int channel)
   mData1 = i&0x7F;
 }
 
+void IMidiMsg::MakeChannelAftertouchMsg(double value, int channel)
+{
+    Clear();
+    mStatus = channel | (kChannelAftertouch << 4);
+    mData1 = static_cast<BYTE>(value * 127.0);
+}
+
 void IMidiMsg::MakeControlChangeMsg(EControlChangeMsg idx, double value, int channel)
 {
   Clear();

diff --git a/WDL/IPlug/IPlugStructs.h b/WDL/IPlug/IPlugStructs.h
@@ -385,6 +385,7 @@ struct IMidiMsg
   void MakeNoteOnMsg(int noteNumber, int velocity, int offset, int channel=0);
   void MakeNoteOffMsg(int noteNumber, int offset, int channel=0);
   void MakePitchWheelMsg(double value, int channel=0);  // Value in [-1, 1], converts to [0, 16384) where 8192 = no pitch change.
+  void MakeChannelAftertouchMsg(double value, int channel=0);
   void MakeControlChangeMsg(EControlChangeMsg idx, double value, int channel=0);           //  Value in [0, 1].
   int Channel(); // returns [0, 15] for midi channels 1 ... 16
 

diff --git a/WDL/IPlug/IPlugVST3.cpp b/WDL/IPlug/IPlugVST3.cpp
@@ -8,6 +8,7 @@
 #include "pluginterfaces/base/ibstream.h"
 #include "pluginterfaces/vst/ivstparameterchanges.h"
 #include "pluginterfaces/vst/ivstevents.h"
+#include "pluginterfaces/vst/ivstmidicontrollers.h"
 
 using namespace Steinberg;
 using namespace Vst;
@@ -145,6 +146,33 @@ IPlugVST3::~IPlugVST3() {}
 #pragma mark -
 #pragma mark AudioEffect overrides
 
+Steinberg::tresult PLUGIN_API IPlugVST3::getMidiControllerAssignment(Steinberg::int32 busIndex, Steinberg::int16 channel,
+    Steinberg::Vst::CtrlNumber midiControllerNumber, Steinberg::Vst::ParamID& id) {
+
+    if (busIndex == 0) {
+        id = -1;
+        switch (midiControllerNumber) {
+
+        case Steinberg::Vst::kAfterTouch:
+            id = kAftertouchParam;
+            break;
+
+            // other midi cc mappings here...
+
+        default:
+            break;
+        }
+
+        if (id == -1) {
+            id = 0;
+            return kResultFalse;
+        }
+        else {
+            return kResultTrue;
+        }
+    }
+}
+
 tresult PLUGIN_API IPlugVST3::initialize (FUnknown* context)
 {
   TRACE;
@@ -200,6 +228,12 @@ tresult PLUGIN_API IPlugVST3::initialize (FUnknown* context)
     {
       addEventInput (STR16("MIDI Input"), 1);
       //addEventOutput(STR16("MIDI Output"), 1);
+
+      Parameter * param;
+      param = new RangeParameter(USTRING("MIDI Aftertouch"), kAftertouchParam, USTRING(""),
+          0.0, 1.0, 0.0, 0, ParameterInfo::kIsReadOnly);
+      param->setPrecision(1);
+      parameters.addParameter(param);
     }
 
     if (NPresets())
@@ -381,7 +415,6 @@ tresult PLUGIN_API IPlugVST3::process(ProcessData& data)
         if (paramQueue->getPoint(numPoints - 1,  offsetSamples, value) == kResultTrue)
         {
           int idx = paramQueue->getParameterId();
-
           switch (idx)
           {
             case kBypassParam:
@@ -398,6 +431,15 @@ tresult PLUGIN_API IPlugVST3::process(ProcessData& data)
             case kPresetParam:
               RestorePreset(FromNormalizedParam(value, 0, NPresets(), 1.));
               break;
+
+            case kAftertouchParam:
+            {
+                IMidiMsg msg;
+                msg.MakeChannelAftertouchMsg(value);
+                ProcessMidiMsg(&msg);
+                break;
+            }
+
               //TODO pitch bend, modwheel etc
             default:
               if (idx >= 0 && idx < NParams())

diff --git a/WDL/IPlug/IPlugVST3.h b/WDL/IPlug/IPlugVST3.h
@@ -20,6 +20,7 @@ class IPlugVST3View;
 class IPlugVST3 : public IPlugBase
                 , public Steinberg::Vst::IUnitInfo
                 , public Steinberg::Vst::SingleComponentEffect
+                , public Steinberg::Vst::IMidiMapping
 {
 public:
   IPlugVST3(IPlugInstanceInfo instanceInfo,
@@ -78,6 +79,10 @@ class IPlugVST3 : public IPlugBase
   virtual Steinberg::tresult PLUGIN_API getUnitByBus(Steinberg::Vst::MediaType type, Steinberg::Vst::BusDirection dir, Steinberg::int32 busIndex, Steinberg::int32 channel, Steinberg::Vst::UnitID& unitId) {return Steinberg::kNotImplemented;}
   virtual Steinberg::tresult PLUGIN_API setUnitProgramData(Steinberg::int32 listOrUnitId, Steinberg::int32 programIndex, Steinberg::IBStream* data) {return Steinberg::kNotImplemented;}
 
+  virtual Steinberg::tresult PLUGIN_API getMidiControllerAssignment(Steinberg::int32 busIndex, Steinberg::int16 channel,
+      Steinberg::Vst::CtrlNumber midiControllerNumber, Steinberg::Vst::ParamID& id);
+
+
   //IPlugBase
   virtual void BeginInformHostOfParamChange(int idx);
   virtual void InformHostOfParamChange(int idx, double normalizedValue);
@@ -109,12 +114,13 @@ class IPlugVST3 : public IPlugBase
 //    kExpressionParam = 'expr',
 //    kPitchBendParam = 'pitb',
 //    kSustainParam = 'sust',
-//    kAftertouchParam = 'aftt',
+    kAftertouchParam = 'aftt'
   };
 
   OBJ_METHODS (IPlugVST3, SingleComponentEffect)
   DEFINE_INTERFACES
   DEF_INTERFACE (IUnitInfo)
+  DEF_INTERFACE(IMidiMapping)
   END_DEFINE_INTERFACES (SingleComponentEffect)
   REFCOUNT_METHODS(SingleComponentEffect)