From a5b8bfb6ac31a5f762943c09b9379ecaa2e1b91d Mon Sep 17 00:00:00 2001
From: Paul Ferrand <paulfd@outlook.fr>
Date: Sun, 8 Dec 2019 18:11:17 +0100
Subject: [PATCH] Added a freewheeling option to the synth

---
 src/sfizz.h                 |  3 ++-
 src/sfizz/Synth.cpp         |  3 +++
 src/sfizz/Synth.h           |  4 ++++
 src/sfizz/sfizz_wrapper.cpp | 12 ++++++++++++
 4 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/sfizz.h b/src/sfizz.h
index 0f155850..869b10c9 100644
--- a/src/sfizz.h
+++ b/src/sfizz.h
@@ -324,7 +324,8 @@ int sfizz_get_num_buffers(sfizz_synth_t* synth);
  */
 int sfizz_get_num_bytes(sfizz_synth_t* synth);
 
-
+void sfizz_enable_freewheeling(sfizz_synth_t* synth);
+void sfizz_disable_freewheeling(sfizz_synth_t* synth);
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/sfizz/Synth.cpp b/src/sfizz/Synth.cpp
index 68ca29d1..401c1610 100644
--- a/src/sfizz/Synth.cpp
+++ b/src/sfizz/Synth.cpp
@@ -351,6 +351,9 @@ void sfz::Synth::renderBlock(AudioSpan<float> buffer) noexcept
 
     resources.filePool.cleanupPromises();
 
+    if (freeWheeling)
+        resources.filePool.waitForBackgroundLoading();
+
     AtomicGuard callbackGuard { inCallback };
     if (!canEnterCallback)
         return;
diff --git a/src/sfizz/Synth.h b/src/sfizz/Synth.h
index 2f91b189..ce181284 100644
--- a/src/sfizz/Synth.h
+++ b/src/sfizz/Synth.h
@@ -324,6 +324,9 @@ public:
      * @return     The allocated bytes.
      */
     int getAllocatedBytes() const noexcept { return Buffer<float>::counter().getTotalBytes(); }
+
+    void enableFreeWheeling() { freeWheeling = true; }
+    void disableFreeWheeling() { freeWheeling = true; }
 protected:
     /**
      * @brief The parser callback; this is called by the parent object each time
@@ -419,6 +422,7 @@ private:
     // Atomic guards; must be used with AtomicGuard and AtomicDisabler
     std::atomic<bool> canEnterCallback { true };
     std::atomic<bool> inCallback { false };
+    bool freeWheeling { false };
 
     // Singletons passed as references to the voices
     Resources resources;
diff --git a/src/sfizz/sfizz_wrapper.cpp b/src/sfizz/sfizz_wrapper.cpp
index 2fccaa34..5b27a7b4 100644
--- a/src/sfizz/sfizz_wrapper.cpp
+++ b/src/sfizz/sfizz_wrapper.cpp
@@ -204,6 +204,18 @@ int sfizz_get_num_bytes(sfizz_synth_t* synth)
     return self->getAllocatedBytes();
 }
 
+void sfizz_enable_freewheeling(sfizz_synth_t* synth)
+{
+    auto self = reinterpret_cast<sfz::Synth*>(synth);
+    self->enableFreeWheeling();
+}
+
+void sfizz_disable_freewheeling(sfizz_synth_t* synth)
+{
+    auto self = reinterpret_cast<sfz::Synth*>(synth);
+    self->enableFreeWheeling();
+}
+
 #ifdef __cplusplus
 }
 #endif