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audio subsystem: completed base functionality of the renderer, external and engine sounds moved from cab to vehicle, minor fixes to various sound-related methods

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This commit is contained in:
tmj-fstate
2017-11-29 01:50:57 +01:00
parent bc43c21174
commit 3afff7c3ab
27 changed files with 2488 additions and 1929 deletions
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54
audiorenderer.h
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@@ -14,6 +14,15 @@ http://mozilla.org/MPL/2.0/.
class sound_source;
// sound emitter state sync item
struct sound_properties {
glm::dvec3 location;
float base_gain { 1.f };
float placement_gain { 1.f };
std::uintptr_t placement_stamp { ~( std::uintptr_t{ 0 } ) };
float base_pitch { 1.f };
};
namespace audio {
// implementation part of the sound emitter
@@ -29,6 +38,8 @@ struct openal_source {
buffer_sequence buffers; // sequence of samples the source will emit
int buffer_index; // currently queued sample from the buffer sequence
bool is_playing { false };
bool is_looping { false };
sound_properties properties;
// methods
template <class Iterator_>
@@ -47,25 +58,42 @@ struct openal_source {
// starts playback of queued buffers
void
play();
// updates state of the source
void
update( double const Deltatime );
// configures state of the source to match the provided set of properties
void
sync_with( sound_properties const &State );
// stops the playback
void
stop();
// updates state of the source
void
update( int const Deltatime );
// toggles looping of the sound emitted by the source
void
loop( bool const State );
// sets max audible distance for sounds emitted by the source
void
range( float const Range );
// sets modifier applied to the pitch of sounds emitted by the source
void
pitch( float const Pitch );
// releases bound buffers and resets state of the class variables
// NOTE: doesn't release allocated implementation-side source
void
clear();
private:
// members
double update_deltatime; // time delta of most current update
float pitch_variation { 1.f }; // emitter-specific variation of the base pitch
float sound_range { 50.f }; // cached audible range of the emitted samples
};
class openal_renderer {
friend class opengl_renderer;
public:
// destructor
~openal_renderer();
@@ -89,9 +117,12 @@ public:
// schedules playback of specified sample, under control of the specified sound emitter
void
insert( sound_source *Controller, audio::buffer_handle const Sound );
// removes from the queue all sounds controlled by the specified sound emitter
void
erase( sound_source const *Controller );
// updates state of all active emitters
void
update( int const Deltatime );
update( double const Deltatime );
private:
// types
@@ -107,6 +138,7 @@ private:
ALCdevice * m_device { nullptr };
ALCcontext * m_context { nullptr };
bool m_ready { false }; // renderer is initialized and functional
glm::dvec3 m_listenerposition;
buffer_manager m_buffers;
// TBD: list of sources as vector, sorted by distance, for openal implementations with limited number of active sources?
@@ -116,6 +148,20 @@ private:
extern openal_renderer renderer;
inline
float
amplitude_to_db( float const Amplitude ) {
return 20.f * std::log10( Amplitude );
}
inline
float
db_to_amplitude( float const Decibels ) {
return std::pow( 10.f, Decibels / 20.f );
}
} // audio
//---------------------------------------------------------------------------