[SoundService] add alt-tab sound fader

src/apps/engine/src/main.cpp

@@ -5,6 +5,7 @@
 #include "compiler.h"
 #include "file_service.h"
 #include "s_debug.h"
+#include "v_sound_service.h"
 #include "storm/fs.h"
 #include "watermark.hpp"
 
@@ -69,11 +70,19 @@ void HandleWindowEvent(const storm::OSWindow::Event &event)
     {
         bActive = true;
         core.AppState(bActive);
+        if (const auto soundService = static_cast<VSoundService *>(core.CreateService("SoundService")))
+        {
+            soundService->SetActiveWithFade(true);
+        }
     }
     else if (event == storm::OSWindow::FocusLost)
     {
         bActive = false;
         core.AppState(bActive);
+        if (const auto soundService = static_cast<VSoundService *>(core.CreateService("SoundService")))
+        {
+            soundService->SetActiveWithFade(false);
+        }
     }
 }
 

src/libs/sound_service/include/v_sound_service.h

@@ -76,6 +76,9 @@ class VSoundService : public SERVICE
 
     virtual void SetEnabled(bool _enabled) = 0;
     virtual void LoadAliasFile(const char *_filename) = 0;
+
+    virtual void SetActiveWithFade(bool active) = 0;
+
     tSoundStatistics soundStatistics;
 };
 

src/libs/sound_service/src/sound_service.cpp

@@ -88,12 +88,16 @@ bool SoundService::Init()
         return false;
     }
     core.Trace("Using FMOD %08x", FMOD_VERSION);
-
     CHECKFMODERR(system->setSoftwareChannels(64));
     CHECKFMODERR(system->setOutput(FMOD_OUTPUTTYPE_AUTODETECT));
     CHECKFMODERR(system->init(MAX_SOUNDS_SLOTS, FMOD_INIT_NORMAL, nullptr));
     CHECKFMODERR(system->set3DSettings(1.0, DISTANCEFACTOR, 1.0f));
 
+    if (const auto ini = fio->OpenIniFile(core.EngineIniFileName()))
+    {
+        fadeTimeInSeconds = ini->GetFloat("sound", "fade_time", 0.5f);
+    }
+
     SoundsActive = 2; // 0 and 1 are special
 
     InitAliases();
@@ -830,6 +834,64 @@ void SoundService::SetEnabled(bool _enabled)
 {
 }
 
+void SoundService::SetActiveWithFade(const bool active)
+{
+    if (fadeTimeInSeconds == 0.0f)
+    {
+        return;
+    }
+
+    if (active)
+    {
+        system->mixerResume();
+    }
+
+    FMOD::ChannelGroup* mastergroup;
+    CHECKFMODERR(system->getMasterChannelGroup(&mastergroup));
+    unsigned long long parentclock;
+    int rate;
+    system->getSoftwareFormat(&rate, nullptr, nullptr);
+    mastergroup->getDSPClock(nullptr, &parentclock);
+
+    const auto dsp_clock_start = parentclock;
+    const auto dsp_clock_end = static_cast<unsigned long long>(parentclock + fadeTimeInSeconds * rate);
+
+    if (active)
+    {
+        mastergroup->setDelay(dsp_clock_start, 0, false);
+    }
+
+    for (const auto& PlayingSound : PlayingSounds)
+    {
+        if (PlayingSound.bFree)
+            continue;
+
+        float volume = 0.0f;
+
+        if (PlayingSound.type == VOLUME_FX)
+        {
+            volume = fFXVolume;
+        }
+        else if (PlayingSound.type == VOLUME_MUSIC)
+        {
+            volume = fMusicVolume;
+        }
+        else if (PlayingSound.type == VOLUME_SPEECH)
+        {
+            volume = fSpeechVolume;
+        }
+
+        PlayingSound.channel->addFadePoint(dsp_clock_start, active ? 0.0f : volume);
+        PlayingSound.channel->addFadePoint(dsp_clock_end, active ? volume : 0.0f);
+    }
+
+    if (!active)
+    {
+        mastergroup->setDelay(dsp_clock_start, dsp_clock_end, false);
+        system->mixerSuspend();
+    }
+}
+
 void SoundService::SoundStop(TSD_ID _id, long _time)
 {
     bool is_playing; // boal fix

src/libs/sound_service/src/sound_service.h

@@ -167,6 +167,8 @@ class SoundService : public VSoundService
 
     float fPitch;
 
+    float fadeTimeInSeconds = 0.5f;
+
   public:
     SoundService();
     ~SoundService() override;
@@ -210,6 +212,8 @@ class SoundService : public VSoundService
     bool AddScheme(const char *_schemeName) override;
     void SetEnabled(bool _enabled) override;
 
+    void SetActiveWithFade(bool active) override;
+
     void DebugDraw();
     void DebugPrint3D(const CVECTOR &pos3D, float rad, long line, float alpha, uint32_t color, float scale,
                       const char *format, ...) const;