feat(modulation): add envelopes, LFOs and modulation matrix

Source/ModulationMatrix.cpp

@@ -0,0 +1,62 @@
+#include "ModulationMatrix.h"
+
+namespace serum
+{
+
+bool ModulationMatrix::addConnection (ModSource source, ModTarget target, float depth, bool bipolar)
+{
+    if (target == ModTarget::None || (int) connections.size() >= kMaxConnections)
+        return false;
+    connections.push_back ({ source, target, depth, bipolar });
+    return true;
+}
+
+void ModulationMatrix::removeConnection (int index)
+{
+    if (index >= 0 && index < (int) connections.size())
+        connections.erase (connections.begin() + index);
+}
+
+void ModulationMatrix::removeAllWithTarget (ModTarget target)
+{
+    connections.erase (std::remove_if (connections.begin(), connections.end(),
+        [target] (const ModConnection& c) { return c.target == target; }),
+        connections.end());
+}
+
+juce::ValueTree ModulationMatrix::toValueTree() const
+{
+    juce::ValueTree tree ("MODMATRIX");
+    for (const auto& c : connections)
+    {
+        juce::ValueTree con ("CONNECTION");
+        con.setProperty ("source",   modSourceToString (c.source), nullptr);
+        con.setProperty ("target",   modTargetToString (c.target), nullptr);
+        con.setProperty ("depth",    c.depth, nullptr);
+        con.setProperty ("bipolar",  c.bipolar, nullptr);
+        tree.appendChild (con, nullptr);
+    }
+    return tree;
+}
+
+void ModulationMatrix::fromValueTree (const juce::ValueTree& tree)
+{
+    connections.clear();
+    if (! tree.isValid())
+        return;
+
+    for (const auto& con : tree)
+    {
+        if (! con.hasType ("CONNECTION"))
+            continue;
+        ModConnection c;
+        c.source  = modSourceFromString (con.getProperty ("source").toString());
+        c.target  = modTargetFromString (con.getProperty ("target").toString());
+        c.depth   = (float) con.getProperty ("depth", 0.0);
+        c.bipolar = (bool)  con.getProperty ("bipolar", false);
+        if (c.target != ModTarget::None && (int) connections.size() < kMaxConnections)
+            connections.push_back (c);
+    }
+}
+
+} // namespace serum