source: trunk/src/sdl/sdl_audio.cc @ 338

// Copyright (C) 2012-2014 ChaosForge Ltd
// http://chaosforge.org/
//
// This file is part of NV Libraries.
// For conditions of distribution and use, see copyright notice in nv.hh

#include "nv/sdl/sdl_audio.hh"

#include <glm/gtx/vector_angle.hpp>
#include "nv/lib/sdl.hh"
#include "nv/lib/sdl_mixer.hh"
#include "nv/core/logging.hh"

using namespace nv;

sdl::audio::audio()
{
        nv::load_sdl_library();
        nv::load_sdl_mixer_library();

        if ( SDL_Init( SDL_INIT_AUDIO ) == -1 ) 
        {
                NV_LOG( LOG_CRITICAL, "SDL_AUDIO failed to load -- " << SDL_GetError() );
                return;
        }

        if( Mix_OpenAudio( 44100, MIX_DEFAULT_FORMAT, 2, 1024 ) == -1 )
        {
                NV_LOG( LOG_CRITICAL, "SDL_mixer failed to load -- " << Mix_GetError() );
                return;
        }
}

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 )
        {
                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) );
                }
        }
        return channel();
}

nv::sound nv::sdl::audio::load_sound( const std::string& a_path )
{
        // TODO: this is a really weird error - if we remove this check, all hell gets loose
        if ( Mix_LoadWAV_RW == nullptr || SDL_RWFromFile == nullptr ) 
        {
                NV_LOG( LOG_ERROR, "SDL_mixer not loaded!" );
        }
        Mix_Chunk *sample = Mix_LoadWAV_RW(SDL_RWFromFile(a_path.c_str(), "rb"), 1);
        if ( sample == nullptr )
        {
                NV_LOG( LOG_ERROR, "SDL_mixer failed to load sample '" << a_path << "' -- " << Mix_GetError() );
                return sound();
        }
        sound result = m_sounds.create();
        sound_info* info = m_sounds.get( result );
        info->sdl_sound = sample;
        return result;
}

void nv::sdl::audio::update( vec3 position )
{
        m_position = position;
}

nv::sdl::audio::~audio()
{
        while ( m_sounds.size() > 0 )
                release( m_sounds.get_handle(0) );
        Mix_CloseAudio();
        // TODO: should we do it here?
        SDL_Quit();
}

void nv::sdl::audio::release( sound a_sound )
{
        sound_info* info = m_sounds.get( a_sound );
        if ( info )
        {
                Mix_FreeChunk( (Mix_Chunk*)info->sdl_sound );
                m_sounds.destroy( a_sound );
        }
}

void nv::sdl::audio::set_orientation( vec3 forward, vec3 up )
{
        m_forward = forward;
        m_up      = up;
}