Allow individual sound source to be enabled/disabled

src/sound.cpp

@@ -293,11 +293,14 @@ void SoundManager::render() {
 
   int sid_to_remove = -1;
   for (int sid = 0; sid < sources.size(); sid += 1) {
+    auto &pair = sources[sid];
     ImGui::PushID(sid);
     ImGui::BeginChild("##Sound", ImVec2(0, 0), ImGuiChildFlags_Border | ImGuiChildFlags_AutoResizeY);
-    ImGui::Text("Sound #%d", (sid + 1));
+    ImGui::Text("Sound #%d (%s)", (sid + 1), pair.source->name());
 
-    sources[sid]->render();
+    ImGui::Checkbox("Enable", &pair.enable);
+
+    pair.source->render();
 
     if (ImGui::Button("Remove")) {
       sid_to_remove = sid;
@@ -319,9 +322,9 @@ void SoundManager::update(bool play_sound) {
 
   memset(samples.data(), 0, samples.size() * sizeof(float));
 
-  for (auto &source : sources) {
-    source->update(play_sound, time);
-    const float* source_samples = source->get_samples();
+  for (auto &pair : sources) {
+    pair.source->update(play_sound && pair.enable, time);
+    const float* source_samples = pair.source->get_samples();
     for (int i = 0; i < buffer.size(); i += 1) {
       samples[i] += source_samples[i];
     }
@@ -337,7 +340,10 @@ void SoundManager::update(bool play_sound) {
 }
 
 void SoundManager::add_source(std::unique_ptr<SoundSource> source) {
-  sources.push_back(std::move(source));
+  sources.push_back(sound_source_pair {
+    std::move(source),
+    true,
+  });
 }
 
 void SoundManager::remove_source_at(size_t index) {

src/sound.h

@@ -15,6 +15,7 @@ class SoundSource {
 public:
   virtual ~SoundSource() = default;
 
+  virtual const char* name() const = 0;
   virtual void render() = 0;
   virtual void update(bool play_sound, double time) = 0;
 
@@ -30,6 +31,7 @@ class WaveGeneratorSource final : public SoundSource {
 public:
   virtual ~WaveGeneratorSource() = default;
 
+  virtual const char* name() const override { return "Wave Generator"; }
   virtual void render() override;
   virtual void update(bool play_sound, double time) override;
 
@@ -45,6 +47,7 @@ class WaveFileSource final : public SoundSource {
 public:
   virtual ~WaveFileSource();
 
+  virtual const char* name() const override { return "Wave File"; }
   virtual void render() override;
   virtual void update(bool play_sound, double time) override;
 
@@ -75,9 +78,14 @@ class SoundManager final {
   void remove_source_at(size_t index);
 
 private:
+  struct sound_source_pair {
+    std::unique_ptr<SoundSource> source;
+    bool enable;
+  };
+
   double time = 0;
   AudioStream stream;
   std::array<float, kMaxSamplesPerUpdate> samples;
   std::array<short, kMaxSamplesPerUpdate> buffer;
-  std::vector<std::unique_ptr<SoundSource>> sources;
+  std::vector<sound_source_pair> sources;
 };