1 files changed, 21 insertions, 3 deletions

diff --git a/src/Main.c b/src/Main.c
index d83511a..71b2580 100644
--- a/src/Main.c
+++ b/src/Main.c
@@ -10,7 +10,25 @@
 
 SDL_AtomicInt is_speaking;
 SDL_AtomicInt app_running;
-float shared_rms = 0.0f;
+SDL_AtomicInt shared_rms_bits;
+
+static inline void atomic_store_float(SDL_AtomicInt *a, float f) {
+  union {
+    float f;
+    int i;
+  } u;
+  u.f = f;
+  SDL_SetAtomicInt(a, u.i);
+}
+
+static inline float atomic_load_float(SDL_AtomicInt *a) {
+  union {
+    float f;
+    int i;
+  } u;
+  u.i = SDL_GetAtomicInt(a);
+  return u.f;
+}
 
 int SDLCALL audio_thread_func(void *data) {
   (void)data;
@@ -34,7 +52,7 @@ int SDLCALL audio_thread_func(void *data) {
     for (int i = 0; i < BUFFER_SIZE; i++)
       sum_squares += (double)buffer[i] * buffer[i];
     float rms = (float)sqrt(sum_squares / BUFFER_SIZE);
-    shared_rms = rms;
+    atomic_store_float(&shared_rms_bits, rms);
     SDL_SetAtomicInt(&is_speaking, rms > VOLUME_THRESHOLD ? 1 : 0);
   }
   pa_simple_free(s);
@@ -61,7 +79,7 @@ int main(void) {
       if (event.type == SDL_EVENT_QUIT)
         SDL_SetAtomicInt(&app_running, 0);
     }
-    float target_rms = shared_rms;
+    float target_rms = atomic_load_float(&shared_rms_bits);
     if (target_rms < VOLUME_THRESHOLD)
       target_rms = 0.0f;
     visual_rms += (target_rms - visual_rms) * LERP_SPEED;