From 30b579feb4ec174a8a6b842c90ea6156a79aa4c7 Mon Sep 17 00:00:00 2001
From: Jean Pierre Cimalando <jp-dev@inbox.ru>
Date: Tue, 25 Feb 2020 15:23:53 +0100
Subject: [PATCH] Add stdatomic.h compatibility for MSVC

---
 lv2/atomic_compat.h | 64 +++++++++++++++++++++++++++++++++++++++++++++
 lv2/sfizz.c         |  9 ++++---
 2 files changed, 69 insertions(+), 4 deletions(-)
 create mode 100644 lv2/atomic_compat.h

diff --git a/lv2/atomic_compat.h b/lv2/atomic_compat.h
new file mode 100644
index 00000000..0778356b
--- /dev/null
+++ b/lv2/atomic_compat.h
@@ -0,0 +1,64 @@
+/*
+  SPDX-License-Identifier: ISC
+
+  Sfizz LV2 plugin
+
+  Copyright 2019-2020, Paul Ferrand <paul@ferrand.cc>
+
+  This file was based on skeleton and example code from the LV2 plugin
+  distribution available at http://lv2plug.in/
+
+  The LV2 sample plugins have the following copyright and notice, which are
+  extended to the current work:
+  Copyright 2011-2016 David Robillard <d@drobilla.net>
+  Copyright 2011 Gabriel M. Beddingfield <gabriel@teuton.org>
+  Copyright 2011 James Morris <jwm.art.net@gmail.com>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  Compiling this plugin statically against libsndfile implies distributing it
+  under the terms of the LGPL v3 license. See the LICENSE.md file for more
+  information. If you did not receive a LICENSE.md file, inform the current
+  maintainer.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#if defined(__cplusplus)
+
+#include <atomic>
+
+#elif defined(_MSC_VER)
+
+#include <intrin.h>
+
+typedef volatile int atomic_int;
+
+inline int atomic_exchange(atomic_int *d, int x)
+{
+    return _InterlockedExchange((volatile long *)d, (long)x);
+}
+
+inline void atomic_store(atomic_int *d, int x)
+{
+    _InterlockedExchange((volatile long *)d, (long)x);
+}
+
+inline int atomic_load(const atomic_int *d)
+{
+    return _InterlockedOr((volatile long *)d, 0);
+}
+
+#else
+
+#include <stdatomic.h>
+
+#endif
diff --git a/lv2/sfizz.c b/lv2/sfizz.c
index 279295a7..0b2f6402 100644
--- a/lv2/sfizz.c
+++ b/lv2/sfizz.c
@@ -53,9 +53,10 @@
 #include <sfizz.h>
 #include <stdbool.h>
 #include <stdlib.h>
-#include <stdatomic.h>
 #include <string.h>
 
+#include "atomic_compat.h"
+
 #define DEFAULT_SFZ_FILE "/home/paul/Documents/AVL_Percussions/AVL_Drumkits_Percussion-1.0-Alt.sfz"
 #define SFIZZ_URI "http://sfztools.github.io/sfizz"
 #define SFIZZ_PREFIX SFIZZ_URI "#"
@@ -149,7 +150,7 @@ typedef struct
     int max_block_size;
     int sample_counter;
     float sample_rate;
-    _Atomic(bool) must_update_midnam;
+    atomic_int must_update_midnam;
 } sfizz_plugin_t;
 
 enum
@@ -693,7 +694,7 @@ run(LV2_Handle instance, uint32_t sample_count)
     // Render the block
     sfizz_render_block(self->synth, self->output_buffers, 2, (int)sample_count);
 
-    if (self->midnam && atomic_exchange(&self->must_update_midnam, false))
+    if (self->midnam && atomic_exchange(&self->must_update_midnam, 0))
     {
         self->midnam->update(self->midnam->handle);
     }
@@ -784,7 +785,7 @@ sfizz_lv2_update_file_info(sfizz_plugin_t* self, const char* file_path)
     lv2_log_note(&self->logger, "[sfizz] Number of groups: %d\n", sfizz_get_num_groups(self->synth));
     lv2_log_note(&self->logger, "[sfizz] Number of regions: %d\n", sfizz_get_num_regions(self->synth));
 
-    atomic_store(&self->must_update_midnam, true);
+    atomic_store(&self->must_update_midnam, 1);
 }
 
 static LV2_State_Status