Big refactor, shuffling a lot of files around

src/resource/audio.cpp

@@ -0,0 +1,49 @@
+#include "audio.h"
+
+#include <utility>
+
+namespace anm2ed::resource
+{
+  MIX_Mixer* Audio::mixer_get()
+  {
+    static MIX_Mixer* mixer = MIX_CreateMixerDevice(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, nullptr);
+    return mixer;
+  }
+
+  Audio::Audio(const char* path)
+  {
+    if (path && *path) internal = MIX_LoadAudio(mixer_get(), path, true);
+  }
+
+  void Audio::unload()
+  {
+    if (!internal) return;
+    MIX_DestroyAudio(internal);
+    internal = nullptr;
+  }
+
+  void Audio::play()
+  {
+    MIX_PlayAudio(mixer_get(), internal);
+  }
+
+  Audio::Audio(Audio&& other) noexcept
+  {
+    internal = std::exchange(other.internal, nullptr);
+  }
+
+  Audio& Audio::operator=(Audio&& other) noexcept
+  {
+    if (this != &other)
+    {
+      unload();
+      internal = std::exchange(other.internal, nullptr);
+    }
+    return *this;
+  }
+
+  Audio::~Audio()
+  {
+    unload();
+  }
+}