Enabling sound in-game works even for engines / looped sounds now

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@6255 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/audio/sfx_base.hpp

@@ -57,6 +57,7 @@ public:
     virtual void       volume(float gain)   = 0;
     virtual SFXManager::SFXStatus  
                        getStatus()          = 0;
+    virtual void       onSoundEnabledBack() = 0;
 };   // SfxBase
 
 

src/audio/sfx_buffer.hpp

@@ -93,6 +93,8 @@ public:
     bool     isPositional() const { return m_positional; }
     float    getRolloff() const { return m_rolloff; }
     float    getGain() const { return m_gain; }
+    
+    std::string getFileName() const { return m_file; }
 
 };
 

src/audio/sfx_manager.cpp

@@ -113,6 +113,12 @@ void SFXManager::soundToggled(const bool on)
         }
         
         resumeAll();
+        
+        const int sfx_amount = m_all_sfx.size();
+        for (int n=0; n<sfx_amount; n++)
+        {
+            m_all_sfx[n]->onSoundEnabledBack();
+        }
     }
     else
     {

src/audio/sfx_openal.cpp

@@ -41,7 +41,9 @@ SFXOpenAL::SFXOpenAL(SFXBuffer* buffer, bool positional, float gain) : SFXBase()
     m_ok          = false;
     m_positional  = positional;
     m_defaultGain = gain;
-
+    m_loop        = false;
+    m_gain        = -1.0f;
+    
     // Don't initialise anything else if the sfx manager was not correctly
     // initialised. First of all the initialisation will not work, and it
     // will not be used anyway.
@@ -55,7 +57,10 @@ SFXOpenAL::SFXOpenAL(SFXBuffer* buffer, bool positional, float gain) : SFXBase()
 
 SFXOpenAL::~SFXOpenAL()
 {
-    alDeleteSources(1, &m_soundSource);
+    if (m_ok)
+    {
+        alDeleteSources(1, &m_soundSource);
+    }
 }   // ~SFXOpenAL
 
 //-----------------------------------------------------------------------------
@@ -79,12 +84,21 @@ bool SFXOpenAL::init()
     alSource3f(m_soundSource, AL_VELOCITY,        0.0, 0.0, 0.0);
     alSource3f(m_soundSource, AL_DIRECTION,       0.0, 0.0, 0.0);
     alSourcef (m_soundSource, AL_ROLLOFF_FACTOR,  m_soundBuffer->getRolloff());
-    alSourcef (m_soundSource, AL_GAIN,            m_defaultGain);
     
+    if (m_gain < 0.0f)
+    {
+        alSourcef (m_soundSource, AL_GAIN,        m_defaultGain);
+    }
+    else
+    {
+        alSourcef (m_soundSource, AL_GAIN,        m_gain);
+    }
     
     if (m_positional) alSourcei (m_soundSource, AL_SOURCE_RELATIVE, AL_FALSE);
     else              alSourcei (m_soundSource, AL_SOURCE_RELATIVE, AL_TRUE);
     
+    alSourcei(m_soundSource, AL_LOOPING, m_loop ? AL_TRUE : AL_FALSE);
+    
     m_ok = SFXManager::checkError("setting up the source");
     
     return m_ok;
@@ -117,6 +131,8 @@ void SFXOpenAL::speed(float factor)
  */
 void SFXOpenAL::volume(float gain)
 {
+    m_gain = m_defaultGain * gain;
+    
     if(!m_ok) return;
 
     alSourcef(m_soundSource, AL_GAIN, m_defaultGain * gain);
@@ -128,6 +144,8 @@ void SFXOpenAL::volume(float gain)
  */
 void SFXOpenAL::setLoop(bool status)
 {
+    m_loop = status;
+    
     if(!m_ok) return;
 
     alSourcei(m_soundSource, AL_LOOPING, status ? AL_TRUE : AL_FALSE);
@@ -141,6 +159,7 @@ void SFXOpenAL::stop()
 {
     if(!m_ok) return;
 
+    m_loop = false;
     alSourcei(m_soundSource, AL_LOOPING, AL_FALSE);
     alSourceStop(m_soundSource);
     SFXManager::checkError("stoping");
@@ -162,8 +181,15 @@ void SFXOpenAL::pause()
  */
 void SFXOpenAL::resume()
 {
-    if(!m_ok) return;
-
+    if (!m_ok)
+    {
+        // lazily create OpenAL source when needed
+        init();
+        
+        // creation of OpenAL source failed, giving up
+        if (!m_ok) return;
+    }
+    
     alSourcePlay(m_soundSource);
     SFXManager::checkError("resuming");
 }   // resume

src/audio/sfx_openal.hpp

@@ -36,11 +36,24 @@
 class SFXOpenAL : public SFXBase
 {
 private:
-    SFXBuffer*   m_soundBuffer;   // Buffers hold sound data.
-    ALuint       m_soundSource;   // Sources are points emitting sound.
+    SFXBuffer*   m_soundBuffer;   //!< Buffers hold sound data.
+    ALuint       m_soundSource;   //!< Sources are points emitting sound.
     bool         m_ok;
     bool         m_positional;
     float        m_defaultGain;
+    
+    /** The OpenAL source contains this info, but if audio is disabled initially then
+        the sound source won't be created and we'll be left with no clue when enabling
+        sounds later */
+    bool m_loop;
+    
+    /** Contains a volume if set through the "volume" method, or a negative number if
+     this method was not called.
+     The OpenAL source contains this info, but if audio is disabled initially then
+     the sound source won't be created and we'll be left with no clue when enabling
+     sounds later. */
+    float m_gain;
+    
 public:
                                   SFXOpenAL(SFXBuffer* buffer, bool positional, float gain);
     virtual                      ~SFXOpenAL();
@@ -57,6 +70,7 @@ public:
     virtual void                  position(const Vec3 &position);
     virtual void                  volume(float gain);
     virtual SFXManager::SFXStatus getStatus();
+    virtual void                  onSoundEnabledBack() { if (m_loop) resume(); }
     
 };   // SFXOpenAL