tram::Audio::Spatial Namespace Reference

Experimental path tracing audio system. More...

Classes
struct	AudioBuffer
struct	AudioRender
struct	AudioSource
struct	PathExplorationResult
struct	PathFromAudioSource
struct	PathRenderingInfo
struct	PathTracingResult

Enumerations
enum	AudioSourceFlags : uint16_t { SOURCE_PLAYING = 1 , SOURCE_REPEATING = 2 }
enum	AudioSampleRate : uint16_t { SAMPLERATE_44100 = 1 , SAMPLERATE_22050 = 2 , SAMPLERATE_11025 = 4 }

Functions
void	InitOutput ()
void	UpdateOutput ()
void	UninitOutput ()
void	LockRenderlist ()
void	UnlockRenderlist ()
void	FindPaths (PathExplorationResult &result, bool metropolis, vec3 position)
void	FindPathsMetropolis (PathExplorationResult *exploration, PathTracingResult *result, vec3 position)
void	InitExplorationPaths (PathExplorationResult *paths)
void	ValidateResult (PathTracingResult &result, vec3 position)
void	RenderResult (PathTracingResult &result, vec3 position)
void	CheckReverb (PathExplorationResult *paths)
void	MakeSomeSourcePaths (PathFromAudioSource &path, vec3 source_position)

Variables
const size_t	PATHS_FOR_RENDERING = 10
const size_t	PATHS_FOR_SOURCE = 5
const size_t	PATHS_FOR_LISTENER = 5
const size_t	BUFFER_COUNT = 1000
const size_t	SOURCE_COUNT = 200
const size_t	SOURCE_DEPTH_LIMIT = 3
const size_t	LISTENER_DEPTH_LIMIT = 6
AudioBuffer	audiobuffers [BUFFER_COUNT]
AudioSource	audiosources [SOURCE_COUNT]
AudioRender	audiorenders [SOURCE_COUNT]
vec3	listener_position
quat	listener_orientation
int32_t	listener_reverb_delay [5]
float	listener_reverb_distance [5]
float	listener_reverb_force [5]
float	listener_reverb_normalized [5]

Detailed Description

Experimental path tracing audio system.

It uses bi-directional path tracing together with Primary Sample Space Metropolis Light Transport algorithm to find paths between the listener and audio sources.

It then attentuates sounds based on surface reflection absorption and distance, does panning based on the angle between the listener and the last reflection and then convolves the resulting impulse response with the sound being played back by the audio source.

Sounds pretty bad (needs tweaking), very slow as well (no optimizations).

I haven't tried recently, but it probably doesn't even compile.

Todo:

Make sure that it compiles and do some improvements

Investigate the possibilities of using hardware accelerated ray-tracing

I am very poor and can't afford a graphics card, NVIDIA pls sponsor me

Enumeration Type Documentation

AudioSampleRate

enum tram::Audio::Spatial::AudioSampleRate : uint16_t

Enumerator
SAMPLERATE_44100
SAMPLERATE_22050
SAMPLERATE_11025

AudioSourceFlags

enum tram::Audio::Spatial::AudioSourceFlags : uint16_t

Enumerator
SOURCE_PLAYING
SOURCE_REPEATING

Function Documentation

CheckReverb()

void tram::Audio::Spatial::CheckReverb

(

PathExplorationResult *

paths

)

FindPaths()

void tram::Audio::Spatial::FindPaths	(	PathExplorationResult &	result,
		bool	metropolis,
		vec3	position
	)

FindPathsMetropolis()

void tram::Audio::Spatial::FindPathsMetropolis	(	PathExplorationResult *	exploration,
		PathTracingResult *	result,
		vec3	position
	)

InitExplorationPaths()

void tram::Audio::Spatial::InitExplorationPaths

(

PathExplorationResult *

paths

)

InitOutput()

void tram::Audio::Spatial::InitOutput

(

)

LockRenderlist()

void tram::Audio::Spatial::LockRenderlist

(

)

MakeSomeSourcePaths()

void tram::Audio::Spatial::MakeSomeSourcePaths	(	PathFromAudioSource &	path,
		vec3	source_position
	)

RenderResult()

void tram::Audio::Spatial::RenderResult	(	PathTracingResult &	result,
		vec3	position
	)

UninitOutput()

void tram::Audio::Spatial::UninitOutput

(

)

UnlockRenderlist()

void tram::Audio::Spatial::UnlockRenderlist

(

)

UpdateOutput()

void tram::Audio::Spatial::UpdateOutput

(

)

ValidateResult()

void tram::Audio::Spatial::ValidateResult	(	PathTracingResult &	result,
		vec3	position
	)

Variable Documentation

audiobuffers

AudioBuffer tram::Audio::Spatial::audiobuffers[BUFFER_COUNT]

extern

audiorenders

AudioRender tram::Audio::Spatial::audiorenders[SOURCE_COUNT]

extern

audiosources

AudioSource tram::Audio::Spatial::audiosources[SOURCE_COUNT]

extern

BUFFER_COUNT

const size_t tram::Audio::Spatial::BUFFER_COUNT = 1000

LISTENER_DEPTH_LIMIT

const size_t tram::Audio::Spatial::LISTENER_DEPTH_LIMIT = 6

listener_orientation

quat tram::Audio::Spatial::listener_orientation

extern

listener_position

vec3 tram::Audio::Spatial::listener_position

extern

listener_reverb_delay

int32_t tram::Audio::Spatial::listener_reverb_delay[5]

extern

listener_reverb_distance

float tram::Audio::Spatial::listener_reverb_distance[5]

extern

listener_reverb_force

float tram::Audio::Spatial::listener_reverb_force[5]

extern

listener_reverb_normalized

float tram::Audio::Spatial::listener_reverb_normalized[5]

extern

PATHS_FOR_LISTENER

const size_t tram::Audio::Spatial::PATHS_FOR_LISTENER = 5

PATHS_FOR_RENDERING

const size_t tram::Audio::Spatial::PATHS_FOR_RENDERING = 10

PATHS_FOR_SOURCE

const size_t tram::Audio::Spatial::PATHS_FOR_SOURCE = 5

SOURCE_COUNT

const size_t tram::Audio::Spatial::SOURCE_COUNT = 200

SOURCE_DEPTH_LIMIT

const size_t tram::Audio::Spatial::SOURCE_DEPTH_LIMIT = 3