From 5c5dd07da109c8373b74340797d793858ec197ae Mon Sep 17 00:00:00 2001
From: Paul Ferrand <paul@ferrand.cc>
Date: Sun, 29 Mar 2020 00:07:44 +0100
Subject: [PATCH] Store polyphony information in the synth

---
 src/sfizz/Synth.cpp | 34 ++++++++++++++++++++++++++++++++++
 src/sfizz/Synth.h   | 16 ++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/src/sfizz/Synth.cpp b/src/sfizz/Synth.cpp
index 6882030c..fd25c42e 100644
--- a/src/sfizz/Synth.cpp
+++ b/src/sfizz/Synth.cpp
@@ -67,6 +67,7 @@ void sfz::Synth::onParseFullBlock(const std::string& header, const std::vector<O
         break;
     case hash("group"):
         groupOpcodes = members;
+        handleGroupOpcodes(members);
         numGroups++;
         break;
     case hash("region"):
@@ -156,6 +157,8 @@ void sfz::Synth::clear()
     masterOpcodes.clear();
     groupOpcodes.clear();
     unknownOpcodes.clear();
+    groupPolyphony.clear();
+    groupMaxPolyphony.clear();
     modificationTime = fs::file_time_type::min();
 }
 
@@ -174,6 +177,26 @@ void sfz::Synth::handleGlobalOpcodes(const std::vector<Opcode>& members)
     }
 }
 
+void sfz::Synth::handleGroupOpcodes(const std::vector<Opcode>& members)
+{
+    absl::optional<unsigned> groupIdx;
+    absl::optional<unsigned> maxPolyphony;
+
+    for (auto& member : members) {
+        switch (member.lettersOnlyHash) {
+        case hash("group"):
+            setValueFromOpcode(member, groupIdx, Default::groupRange);
+            break;
+        case hash("polyphony"):
+            setValueFromOpcode(member, maxPolyphony, Range<unsigned>(0, config::maxVoices));
+            break;
+        }
+    }
+
+    if (groupIdx && maxPolyphony)
+        setGroupPolyphony(*groupIdx, *maxPolyphony);
+}
+
 void sfz::Synth::handleControlOpcodes(const std::vector<Opcode>& members)
 {
     for (auto& member : members) {
@@ -1010,3 +1033,14 @@ void sfz::Synth::allSoundOff() noexcept
     for (auto& effectBus : effectBuses)
         effectBus->clear();
 }
+
+void sfz::Synth::setGroupPolyphony(unsigned groupIdx, unsigned polyphony) noexcept
+{
+    if (groupIdx >= groupMaxPolyphony.size())
+        groupMaxPolyphony.resize(groupIdx + 1);
+
+    if (groupIdx >= groupPolyphony.size())
+        groupPolyphony.resize(groupIdx + 1);
+
+    groupMaxPolyphony[groupIdx] = polyphony;
+}
diff --git a/src/sfizz/Synth.h b/src/sfizz/Synth.h
index b18a453b..e0c5390e 100644
--- a/src/sfizz/Synth.h
+++ b/src/sfizz/Synth.h
@@ -410,6 +410,16 @@ protected:
     void onParseWarning(const SourceRange& range, const std::string& message) override;
 
 private:
+    /**
+     * @brief change the group maximum polyphony
+     *
+     * @param groupIdx the group index
+     * @param polyphone the max polyphony
+     */
+    void setGroupPolyphony(unsigned groupIdx, unsigned polyphony) noexcept;
+    std::vector<unsigned> groupPolyphony;
+    std::vector<unsigned> groupMaxPolyphony;
+
     /**
      * @brief Reset all CCs; to be used on CC 121
      *
@@ -440,6 +450,12 @@ private:
      * @param members the opcodes of the <global> block
      */
     void handleGlobalOpcodes(const std::vector<Opcode>& members);
+    /**
+     * @brief Helper function to dispatch <group> opcodes
+     *
+     * @param members the opcodes of the <group> block
+     */
+    void handleGroupOpcodes(const std::vector<Opcode>& members);
     /**
      * @brief Helper function to dispatch <control> opcodes
      *