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#include "config.h"
#include <stdlib.h>
#include "alMain.h"
#include "alu.h"
#include "backends/base.h"
extern inline ALuint64 GetDeviceClockTime(ALCdevice *device);
extern inline void ALCdevice_Lock(ALCdevice *device);
extern inline void ALCdevice_Unlock(ALCdevice *device);
extern inline ClockLatency GetClockLatency(ALCdevice *device);
/* Base ALCbackend method implementations. */
void ALCbackend_Construct(ALCbackend *self, ALCdevice *device)
{
int ret = almtx_init(&self->mMutex, almtx_recursive);
assert(ret == althrd_success);
self->mDevice = device;
}
void ALCbackend_Destruct(ALCbackend *self)
{
almtx_destroy(&self->mMutex);
}
ALCboolean ALCbackend_reset(ALCbackend* UNUSED(self))
{
return ALC_FALSE;
}
ALCenum ALCbackend_captureSamples(ALCbackend* UNUSED(self), void* UNUSED(buffer), ALCuint UNUSED(samples))
{
return ALC_INVALID_DEVICE;
}
ALCuint ALCbackend_availableSamples(ALCbackend* UNUSED(self))
{
return 0;
}
ClockLatency ALCbackend_getClockLatency(ALCbackend *self)
{
ALCdevice *device = self->mDevice;
ALuint refcount;
ClockLatency ret;
do {
while(((refcount=ATOMIC_LOAD(&device->MixCount, almemory_order_acquire))&1))
althrd_yield();
ret.ClockTime = GetDeviceClockTime(device);
ATOMIC_THREAD_FENCE(almemory_order_acquire);
} while(refcount != ATOMIC_LOAD(&device->MixCount, almemory_order_relaxed));
/* NOTE: The device will generally have about all but one periods filled at
* any given time during playback. Without a more accurate measurement from
* the output, this is an okay approximation.
*/
ret.Latency = device->UpdateSize * DEVICE_CLOCK_RES / device->Frequency *
maxu(device->NumUpdates-1, 1);
return ret;
}
void ALCbackend_lock(ALCbackend *self)
{
int ret = almtx_lock(&self->mMutex);
assert(ret == althrd_success);
}
void ALCbackend_unlock(ALCbackend *self)
{
int ret = almtx_unlock(&self->mMutex);
assert(ret == althrd_success);
}
/* Base ALCbackendFactory method implementations. */
void ALCbackendFactory_deinit(ALCbackendFactory* UNUSED(self))
{
}
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