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#include "config.h"
#include "event.h"
#include <algorithm>
#include <atomic>
#include <cstring>
#include <exception>
#include <memory>
#include <mutex>
#include <new>
#include <string>
#include <thread>
#include <utility>
#include "AL/al.h"
#include "AL/alc.h"
#include "albyte.h"
#include "alc/context.h"
#include "alc/effects/base.h"
#include "alc/inprogext.h"
#include "almalloc.h"
#include "core/async_event.h"
#include "core/except.h"
#include "core/logging.h"
#include "core/voice_change.h"
#include "opthelpers.h"
#include "ringbuffer.h"
#include "threads.h"
static int EventThread(ALCcontext *context)
{
RingBuffer *ring{context->mAsyncEvents.get()};
bool quitnow{false};
while(likely(!quitnow))
{
auto evt_data = ring->getReadVector().first;
if(evt_data.len == 0)
{
context->mEventSem.wait();
continue;
}
std::lock_guard<std::mutex> _{context->mEventCbLock};
do {
auto *evt_ptr = reinterpret_cast<AsyncEvent*>(evt_data.buf);
evt_data.buf += sizeof(AsyncEvent);
evt_data.len -= 1;
AsyncEvent evt{*evt_ptr};
al::destroy_at(evt_ptr);
ring->readAdvance(1);
quitnow = evt.EnumType == AsyncEvent::KillThread;
if(unlikely(quitnow)) break;
if(evt.EnumType == AsyncEvent::ReleaseEffectState)
{
evt.u.mEffectState->release();
continue;
}
uint enabledevts{context->mEnabledEvts.load(std::memory_order_acquire)};
if(!context->mEventCb) continue;
if(evt.EnumType == AsyncEvent::SourceStateChange)
{
if(!(enabledevts&AsyncEvent::SourceStateChange))
continue;
ALuint state{};
std::string msg{"Source ID " + std::to_string(evt.u.srcstate.id)};
msg += " state has changed to ";
switch(evt.u.srcstate.state)
{
case AsyncEvent::SrcState::Reset:
msg += "AL_INITIAL";
state = AL_INITIAL;
break;
case AsyncEvent::SrcState::Stop:
msg += "AL_STOPPED";
state = AL_STOPPED;
break;
case AsyncEvent::SrcState::Play:
msg += "AL_PLAYING";
state = AL_PLAYING;
break;
case AsyncEvent::SrcState::Pause:
msg += "AL_PAUSED";
state = AL_PAUSED;
break;
}
context->mEventCb(AL_EVENT_TYPE_SOURCE_STATE_CHANGED_SOFT, evt.u.srcstate.id,
state, static_cast<ALsizei>(msg.length()), msg.c_str(), context->mEventParam);
}
else if(evt.EnumType == AsyncEvent::BufferCompleted)
{
if(!(enabledevts&AsyncEvent::BufferCompleted))
continue;
std::string msg{std::to_string(evt.u.bufcomp.count)};
if(evt.u.bufcomp.count == 1) msg += " buffer completed";
else msg += " buffers completed";
context->mEventCb(AL_EVENT_TYPE_BUFFER_COMPLETED_SOFT, evt.u.bufcomp.id,
evt.u.bufcomp.count, static_cast<ALsizei>(msg.length()), msg.c_str(),
context->mEventParam);
}
else if(evt.EnumType == AsyncEvent::Disconnected)
{
if(!(enabledevts&AsyncEvent::Disconnected))
continue;
context->mEventCb(AL_EVENT_TYPE_DISCONNECTED_SOFT, 0, 0,
static_cast<ALsizei>(strlen(evt.u.disconnect.msg)), evt.u.disconnect.msg,
context->mEventParam);
}
} while(evt_data.len != 0);
}
return 0;
}
void StartEventThrd(ALCcontext *ctx)
{
try {
ctx->mEventThread = std::thread{EventThread, ctx};
}
catch(std::exception& e) {
ERR("Failed to start event thread: %s\n", e.what());
}
catch(...) {
ERR("Failed to start event thread! Expect problems.\n");
}
}
void StopEventThrd(ALCcontext *ctx)
{
RingBuffer *ring{ctx->mAsyncEvents.get()};
auto evt_data = ring->getWriteVector().first;
if(evt_data.len == 0)
{
do {
std::this_thread::yield();
evt_data = ring->getWriteVector().first;
} while(evt_data.len == 0);
}
al::construct_at(reinterpret_cast<AsyncEvent*>(evt_data.buf), AsyncEvent::KillThread);
ring->writeAdvance(1);
ctx->mEventSem.post();
if(ctx->mEventThread.joinable())
ctx->mEventThread.join();
}
AL_API void AL_APIENTRY alEventControlSOFT(ALsizei count, const ALenum *types, ALboolean enable)
START_API_FUNC
{
ContextRef context{GetContextRef()};
if(unlikely(!context)) return;
if(count < 0) context->setError(AL_INVALID_VALUE, "Controlling %d events", count);
if(count <= 0) return;
if(!types) SETERR_RETURN(context, AL_INVALID_VALUE,, "NULL pointer");
uint flags{0};
const ALenum *types_end = types+count;
auto bad_type = std::find_if_not(types, types_end,
[&flags](ALenum type) noexcept -> bool
{
if(type == AL_EVENT_TYPE_BUFFER_COMPLETED_SOFT)
flags |= AsyncEvent::BufferCompleted;
else if(type == AL_EVENT_TYPE_SOURCE_STATE_CHANGED_SOFT)
flags |= AsyncEvent::SourceStateChange;
else if(type == AL_EVENT_TYPE_DISCONNECTED_SOFT)
flags |= AsyncEvent::Disconnected;
else
return false;
return true;
}
);
if(bad_type != types_end)
SETERR_RETURN(context, AL_INVALID_ENUM,, "Invalid event type 0x%04x", *bad_type);
if(enable)
{
uint enabledevts{context->mEnabledEvts.load(std::memory_order_relaxed)};
while(context->mEnabledEvts.compare_exchange_weak(enabledevts, enabledevts|flags,
std::memory_order_acq_rel, std::memory_order_acquire) == 0)
{
/* enabledevts is (re-)filled with the current value on failure, so
* just try again.
*/
}
}
else
{
uint enabledevts{context->mEnabledEvts.load(std::memory_order_relaxed)};
while(context->mEnabledEvts.compare_exchange_weak(enabledevts, enabledevts&~flags,
std::memory_order_acq_rel, std::memory_order_acquire) == 0)
{
}
/* Wait to ensure the event handler sees the changed flags before
* returning.
*/
std::lock_guard<std::mutex> _{context->mEventCbLock};
}
}
END_API_FUNC
AL_API void AL_APIENTRY alEventCallbackSOFT(ALEVENTPROCSOFT callback, void *userParam)
START_API_FUNC
{
ContextRef context{GetContextRef()};
if(unlikely(!context)) return;
std::lock_guard<std::mutex> _{context->mPropLock};
std::lock_guard<std::mutex> __{context->mEventCbLock};
context->mEventCb = callback;
context->mEventParam = userParam;
}
END_API_FUNC
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