diff options
| author | Chris Robinson <chris.kcat@gmail.com> | 2016-05-11 18:40:17 -0700 |
|---|---|---|
| committer | Chris Robinson <chris.kcat@gmail.com> | 2016-05-11 21:02:11 -0700 |
| commit | 186b54aa3d5f1398a384fa318aa000210d82437e (patch) | |
| tree | 32daef17365aee1fb61a05db9b6c23aec25f6e07 /OpenAL32/Include/alListener.h | |
| parent | 21bc0f5ef8f0e410ea840061589b844d6e401afc (diff) | |
Use a lockless method for updating listener and context properties
This uses a separate container to provide the relevant properties to the
internal update method, using atomic pointer swaps. A free-list is used to
avoid having too many individual containers.
This allows the mixer to update the internal listener properties without
requiring the lock to protect against async updates. It also allows concurrent
read access to the user-facing property values, even the multi-value ones (e.g.
the vectors).
Diffstat (limited to 'OpenAL32/Include/alListener.h')
| -rw-r--r-- | OpenAL32/Include/alListener.h | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/OpenAL32/Include/alListener.h b/OpenAL32/Include/alListener.h index f28561fa..75a3fb46 100644 --- a/OpenAL32/Include/alListener.h +++ b/OpenAL32/Include/alListener.h @@ -8,14 +8,38 @@ extern "C" { #endif +struct ALlistenerProps { + ATOMIC(ALfloat) Position[3]; + ATOMIC(ALfloat) Velocity[3]; + ATOMIC(ALfloat) Forward[3]; + ATOMIC(ALfloat) Up[3]; + ATOMIC(ALfloat) Gain; + ATOMIC(ALfloat) MetersPerUnit; + + ATOMIC(ALfloat) DopplerFactor; + ATOMIC(ALfloat) DopplerVelocity; + ATOMIC(ALfloat) SpeedOfSound; + + ATOMIC(struct ALlistenerProps*) next; +}; + typedef struct ALlistener { - aluVector Position; - aluVector Velocity; + volatile ALfloat Position[3]; + volatile ALfloat Velocity[3]; volatile ALfloat Forward[3]; volatile ALfloat Up[3]; volatile ALfloat Gain; volatile ALfloat MetersPerUnit; + /* Pointer to the most recent property values that are awaiting an update. + */ + ATOMIC(struct ALlistenerProps*) Update; + + /* A linked list of unused property containers, free to use for future + * updates. + */ + ATOMIC(struct ALlistenerProps*) FreeList; + struct { aluMatrixd Matrix; aluVector Velocity; @@ -28,6 +52,8 @@ typedef struct ALlistener { } Params; } ALlistener; +void UpdateListenerProps(ALCcontext *context); + #ifdef __cplusplus } #endif |