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58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
// separate file because of include dependecies mess
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namespace audio {
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template <class Iterator_>
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openal_source &
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openal_source::bind( sound_source *Controller, uint32_sequence Sounds, Iterator_ First, Iterator_ Last ) {
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controller = Controller;
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sounds = Sounds;
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// look up and queue assigned buffers
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std::vector<ALuint> buffers;
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std::for_each(
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First, Last,
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[&]( audio::buffer_handle const &bufferhandle ) {
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auto const &buffer { audio::renderer.buffer( bufferhandle ) };
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if (buffer.id != null_resource) buffers.emplace_back( buffer.id ); } );
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is_multipart = ( buffers.size() > 1 );
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if( id != audio::null_resource && !buffers.empty()) {
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::alSourceQueueBuffers( id, static_cast<ALsizei>( buffers.size() ), buffers.data() );
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::alSourceRewind( id );
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// sound controller can potentially request playback to start from certain buffer point
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// for multipart sounds the offset is applied only to last piece during playback
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// for single sound we also make sure not to apply the offset to optional bookends
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if( controller->start() == 0.f || is_multipart || controller->is_bookend( buffers.front() ) ) {
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// regular case with no offset, reset bound source just in case
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::alSourcei( id, AL_SAMPLE_OFFSET, 0 );
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}
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else {
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// move playback start to specified point in 0-1 range
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ALint buffersize;
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::alGetBufferi( buffers.front(), AL_SIZE, &buffersize );
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::alSourcei(
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id,
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AL_SAMPLE_OFFSET,
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static_cast<ALint>( controller->start() * ( buffersize / sizeof( std::int16_t ) ) ) );
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}
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}
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return *this;
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}
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inline
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float
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amplitude_to_db( float const Amplitude ) {
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return 20.f * std::log10( Amplitude );
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}
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inline
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float
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db_to_amplitude( float const Decibels ) {
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return std::pow( 10.f, Decibels / 20.f );
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}
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}
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