fix directsound loop on unfocus #45

Call GameArea::Pause and ::Resume in MainFrame::OnActivate based on
focus state if the pauseWhenInactive config option is set.

Also stop/play the primary dsound buffer in pause()/resume() in
dsound.cpp, not onlyu the secondary, this may not be necessary but it
doesn't hurt.

src/wx/dsound.cpp

@@ -192,14 +192,16 @@ bool DirectSound::init(long sampleRate)
 
 void DirectSound::pause()
 {
-    if (dsbSecondary == NULL)
+    for (auto buf : {dsbPrimary, dsbSecondary}) {
-        return;
+        if (buf == NULL)
+            continue;
 
         DWORD status;
-    dsbSecondary->GetStatus(&status);
+        buf->GetStatus(&status);
 
         if (status & DSBSTATUS_PLAYING)
-        dsbSecondary->Stop();
+            buf->Stop();
+    }
 }
 
 void DirectSound::reset()
@@ -214,10 +216,12 @@ void DirectSound::reset()
 
 void DirectSound::resume()
 {
-    if (dsbSecondary == NULL)
+    for (auto buf : {dsbPrimary, dsbSecondary}) {
+        if (buf == NULL)
             return;
 
-    dsbSecondary->Play(0, 0, DSBPLAY_LOOPING);
+        buf->Play(0, 0, DSBPLAY_LOOPING);
+    }
 }
 
 void DirectSound::write(uint16_t* finalWave, int length)

src/wx/wxvbam.cpp

@@ -610,6 +610,15 @@ void MainFrame::OnActivate(wxActivateEvent& event)
 
     if (panel && focused)
         panel->SetFocus();
+
+    if (pauseWhenInactive) {
+        if (panel && focused) {
+            panel->Resume();
+        }
+        else if (panel && !focused) {
+            panel->Pause();
+        }
+    }
 }
 
 void MainFrame::OnDropFile(wxDropFilesEvent& event)