Changeset 330 for trunk/src/sdl/sdl_audio.cc

Timestamp:

09/02/14 08:45:01 (11 years ago)

Author:

epyon

Message:

• implemented positional sound interface for audio
• rudimentary implementations of positional sound for fmod and sdl

File:

• trunk/src/sdl/sdl_audio.cc (modified) (5 diffs)

trunk/src/sdl/sdl_audio.cc

@@ -7 +7 @@
 #include "nv/sdl/sdl_audio.hh"
 
+#include <glm/gtx/vector_angle.hpp>
 #include "nv/lib/sdl.hh"
 #include "nv/lib/sdl_mixer.hh"
@@ -31 +32 @@
 }
 
-
-nv::channel sdl::audio::play_sound( sound a_sound )
+nv::channel nv::sdl::audio::play_sound( sound a_sound, float volume, float pan /*= 0.0f */ )
 {
         sound_info* info = m_sounds.get( a_sound );
         if ( info )
         {
-                if ( Mix_PlayChannel(-1, (Mix_Chunk*)( info->sdl_sound), 0) == -1 )
+                int channel = Mix_PlayChannel(-1, (Mix_Chunk*)( info->sdl_sound), 0);
+                if ( channel == -1 )
                 {
                         NV_LOG( LOG_WARNING, "SDL_mixer failed to play -- " << Mix_GetError() );
+                }
+                else
+                {
+                        Mix_Volume( channel, int( volume * 128.0f ) );
+                        if ( pan != 0.0f) 
+                        {
+                                uint8 right = (uint8)( (pan + 1.0f) * 127.0f ); 
+                                Mix_SetPanning( channel, 254-right, right );
+                        }
+                        else
+                        {
+                                Mix_SetPanning( channel, 255, 255 );
+                        }
+                }
+        }
+        return channel();
+}
+
+nv::channel nv::sdl::audio::play_sound( sound a_sound, vec3 position )
+{
+        sound_info* info = m_sounds.get( a_sound );
+        if ( info )
+        {
+                int channel = Mix_PlayChannel(-1, (Mix_Chunk*)( info->sdl_sound), 0);
+                if ( channel == -1 )
+                {
+                        NV_LOG( LOG_WARNING, "SDL_mixer failed to play -- " << Mix_GetError() );
+                }
+                else
+                {
+                        vec3 relative = position - m_position;
+                        float angle = 0;
+                        float distance = 0;
+                        if ( relative != vec3() )
+                        {
+                                angle = -glm::orientedAngle( m_forward, glm::normalize( relative ), m_up );
+                                distance = glm::clamp( 20.0f * glm::length( relative ), 0.0f, 255.0f );
+                        }
+                        if ( angle < 0.0f ) angle += 360.0f;
+                        Mix_SetPosition( channel, sint16(angle), uint8(distance) );
                 }
         }
@@ -47 +88 @@
 nv::sound nv::sdl::audio::load_sound( const std::string& a_path )
 {
-        // TODO: this is a really wierd error - if we remove this check, all hell gets loose
+        // TODO: this is a really weird error - if we remove this check, all hell gets loose
         if ( Mix_LoadWAV_RW == nullptr || SDL_RWFromFile == nullptr ) 
         {
@@ -64 +105 @@
 }
 
-void nv::sdl::audio::update()
+void nv::sdl::audio::update( vec3 position )
 {
-        // no-op
+        m_position = position;
 }
 
@@ -88 +129 @@
 }
 
+void nv::sdl::audio::set_orientation( vec3 forward, vec3 up )
+{
+        m_forward = forward;
+        m_up      = up;
+}
+