From 04181f0d10a71eb088b96ac85b6da425317cb7c6 Mon Sep 17 00:00:00 2001
From: paulfd <paulfd@outlook.fr>
Date: Fri, 23 Aug 2019 14:16:33 +0200
Subject: [PATCH] WIP for Voices

---
 sources/Region.h     |  1 +
 sources/SfzHelpers.h |  2 +-
 sources/Synth.cpp    |  2 +-
 sources/Synth.h      | 54 +++++++++++++++++++++++++++++++++++++++++---
 sources/Voice.h      |  5 ++++
 5 files changed, 59 insertions(+), 5 deletions(-)

diff --git a/sources/Region.h b/sources/Region.h
index 879504b5..336cbe34 100644
--- a/sources/Region.h
+++ b/sources/Region.h
@@ -127,4 +127,5 @@ private:
     int activeNotesInRange { -1 };
     int sequenceCounter { 0 };
 };
+
 } // namespace sfz
\ No newline at end of file
diff --git a/sources/SfzHelpers.h b/sources/SfzHelpers.h
index a37ede19..de733152 100644
--- a/sources/SfzHelpers.h
+++ b/sources/SfzHelpers.h
@@ -11,7 +11,7 @@ using CCValueArray = std::array<uint8_t, 128>;
 using CCValuePair = std::pair<uint8_t, float> ;
 using CCNamePair = std::pair<uint8_t, std::string>;
 
-inline std::optional<uint8_t> readNoteValue(const std::string_view&value)
+inline std::optional<uint8_t> readNoteValue(const std::string_view& value)
 {
     switch(hash(value))
     {
diff --git a/sources/Synth.cpp b/sources/Synth.cpp
index fc68b096..d4ad9965 100644
--- a/sources/Synth.cpp
+++ b/sources/Synth.cpp
@@ -127,7 +127,7 @@ bool sfz::Synth::loadSfzFile(const std::filesystem::path& filename)
     auto currentRegion = regions.begin();
     while (currentRegion <= lastRegion)
     {
-        auto region = &**currentRegion;
+        auto region = currentRegion->get();
         
         if (region->isGenerator())
         {
diff --git a/sources/Synth.h b/sources/Synth.h
index 97f4bde1..59540ca3 100644
--- a/sources/Synth.h
+++ b/sources/Synth.h
@@ -6,6 +6,7 @@
 #include <vector>
 #include <set>
 #include <optional>
+#include <random>
 #include <string_view>
 
 namespace sfz
@@ -44,16 +45,56 @@ public:
         }
     }
 
-    void noteOn(int delay, int channel, int noteNumber, uint8_t velocity);
-    void noteOff(int delay, int channel, int noteNumber, uint8_t velocity);
+    void noteOn(int delay, int channel, int noteNumber, uint8_t velocity)
+    {
+        auto randValue = getUniform();
+        for (auto& region: regions)
+        {
+            if (region->registerNoteOn(channel, noteNumber, velocity, randValue))
+            {
+                auto voice = findFreeVoice();
+                if (voice == nullptr)
+                    continue;
+                
+                voice->startVoice(region.get(), channel, noteNumber, velocity, Voice::TriggerType::NoteOn);
+            }
+        }
+    }
+
+    void noteOff(int delay, int channel, int noteNumber, uint8_t velocity)
+    {
+        auto randValue = getUniform();
+        for (auto& region: regions)
+        {
+            if (region->registerNoteOff(channel, noteNumber, velocity, randValue))
+            {
+                auto voice = findFreeVoice();
+                if (voice == nullptr)
+                    continue;
+                
+                voice->startVoice(region.get(), channel, noteNumber, velocity, Voice::TriggerType::NoteOff);
+                voice->startVoice(region.get(), channel, noteNumber, velocity, Voice::TriggerType::NoteOff);
+            }
+        }
+    }
     void cc(int delay, int channel, int ccNumber, uint8_t ccValue);
     void pitchWheel(int delay, int channel, int pitch);
     void aftertouch(int delay, int channel, uint8_t aftertouch);
     void tempo(int delay, float secondsPerQuarter);
-    
+
 protected:
     void callback(std::string_view header, std::vector<Opcode> members) final;
 private:
+    Voice* findFreeVoice()
+    {
+        auto freeVoice = absl::c_find_if(voices, [](const auto& voice) { return voice->isFree(); });
+        if (freeVoice == voices.end())
+        {
+            DBG("Voices are overloaded, can't start a new note");
+            return {};
+        }
+        return freeVoice->get();
+    }
     bool hasGlobal { false };
     bool hasControl { false };
     int numGroups { 0 };
@@ -81,6 +122,13 @@ private:
     StereoBuffer<float> tempBuffer { config::defaultSamplesPerBlock };
     int samplesPerBlock { config::defaultSamplesPerBlock };
     float sampleRate { config::defaultSampleRate };
+    std::random_device rd { };
+    std::mt19937 randomGenerator { rd() };
+    std::uniform_real_distribution<float> randomDistribution { 0, 1 };
+    float getUniform()
+    {
+        return randomDistribution(randomGenerator);
+    }
 };
 
 }
\ No newline at end of file
diff --git a/sources/Voice.h b/sources/Voice.h
index 56f83c07..eb7b8b55 100644
--- a/sources/Voice.h
+++ b/sources/Voice.h
@@ -27,6 +27,11 @@ public:
         dataReady.store(true);
     }
 
+    bool isFree()
+    {
+        return (region == nullptr);
+    }
+
     bool registerNoteOn(int delay, int channel, int noteNumber, uint8_t velocity);
     void registerNoteOff(int delay, int channel, int noteNumber, uint8_t velocity);
     bool registerCC(int delay, int channel, int ccNumber, uint8_t ccValue);