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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 <optional>
#include <string>
#include <string_view>
#include <thread>
#include <utility>
#include "AL/al.h"
#include "AL/alc.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 "debug.h"
#include "direct_defs.h"
#include "opthelpers.h"
#include "ringbuffer.h"
namespace {
template<typename... Ts>
struct overloaded : Ts... { using Ts::operator()...; };
template<typename... Ts>
overloaded(Ts...) -> overloaded<Ts...>;
int EventThread(ALCcontext *context)
{
RingBuffer *ring{context->mAsyncEvents.get()};
bool quitnow{false};
while(!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 = std::launder(reinterpret_cast<AsyncEvent*>(evt_data.buf));
evt_data.buf += sizeof(AsyncEvent);
evt_data.len -= 1;
AsyncEvent event{std::move(*evt_ptr)};
std::destroy_at(evt_ptr);
ring->readAdvance(1);
quitnow = std::holds_alternative<AsyncKillThread>(event);
if(quitnow) UNLIKELY break;
auto enabledevts = context->mEnabledEvts.load(std::memory_order_acquire);
auto proc_killthread = [](AsyncKillThread&) { };
auto proc_release = [](AsyncEffectReleaseEvent &evt)
{
al::intrusive_ptr<EffectState>{evt.mEffectState};
};
auto proc_srcstate = [context,enabledevts](AsyncSourceStateEvent &evt)
{
if(!context->mEventCb
|| !enabledevts.test(al::to_underlying(AsyncEnableBits::SourceState)))
return;
ALuint state{};
std::string msg{"Source ID " + std::to_string(evt.mId)};
msg += " state has changed to ";
switch(evt.mState)
{
case AsyncSrcState::Reset:
msg += "AL_INITIAL";
state = AL_INITIAL;
break;
case AsyncSrcState::Stop:
msg += "AL_STOPPED";
state = AL_STOPPED;
break;
case AsyncSrcState::Play:
msg += "AL_PLAYING";
state = AL_PLAYING;
break;
case AsyncSrcState::Pause:
msg += "AL_PAUSED";
state = AL_PAUSED;
break;
}
context->mEventCb(AL_EVENT_TYPE_SOURCE_STATE_CHANGED_SOFT, evt.mId, state,
static_cast<ALsizei>(msg.length()), msg.c_str(), context->mEventParam);
};
auto proc_buffercomp = [context,enabledevts](AsyncBufferCompleteEvent &evt)
{
if(!context->mEventCb
|| !enabledevts.test(al::to_underlying(AsyncEnableBits::BufferCompleted)))
return;
std::string msg{std::to_string(evt.mCount)};
if(evt.mCount == 1) msg += " buffer completed";
else msg += " buffers completed";
context->mEventCb(AL_EVENT_TYPE_BUFFER_COMPLETED_SOFT, evt.mId, evt.mCount,
static_cast<ALsizei>(msg.length()), msg.c_str(), context->mEventParam);
};
auto proc_disconnect = [context,enabledevts](AsyncDisconnectEvent &evt)
{
const std::string_view message{evt.msg.data()};
context->debugMessage(DebugSource::System, DebugType::Error, 0,
DebugSeverity::High, message);
if(context->mEventCb
&& enabledevts.test(al::to_underlying(AsyncEnableBits::Disconnected)))
context->mEventCb(AL_EVENT_TYPE_DISCONNECTED_SOFT, 0, 0,
static_cast<ALsizei>(message.length()), message.data(),
context->mEventParam);
};
std::visit(overloaded{proc_srcstate, proc_buffercomp, proc_release, proc_disconnect,
proc_killthread}, event);
} while(evt_data.len != 0);
}
return 0;
}
constexpr std::optional<AsyncEnableBits> GetEventType(ALenum etype) noexcept
{
switch(etype)
{
case AL_EVENT_TYPE_BUFFER_COMPLETED_SOFT: return AsyncEnableBits::BufferCompleted;
case AL_EVENT_TYPE_DISCONNECTED_SOFT: return AsyncEnableBits::Disconnected;
case AL_EVENT_TYPE_SOURCE_STATE_CHANGED_SOFT: return AsyncEnableBits::SourceState;
}
return std::nullopt;
}
} // namespace
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);
}
std::ignore = InitAsyncEvent<AsyncKillThread>(evt_data.buf);
ring->writeAdvance(1);
ctx->mEventSem.post();
if(ctx->mEventThread.joinable())
ctx->mEventThread.join();
}
AL_API DECL_FUNCEXT3(void, alEventControl,SOFT, ALsizei, const ALenum*, ALboolean)
FORCE_ALIGN void AL_APIENTRY alEventControlDirectSOFT(ALCcontext *context, ALsizei count,
const ALenum *types, ALboolean enable) noexcept
{
if(count < 0) context->setError(AL_INVALID_VALUE, "Controlling %d events", count);
if(count <= 0) return;
if(!types) return context->setError(AL_INVALID_VALUE, "NULL pointer");
ContextBase::AsyncEventBitset flags{};
for(ALenum evttype : al::span{types, static_cast<uint>(count)})
{
auto etype = GetEventType(evttype);
if(!etype)
return context->setError(AL_INVALID_ENUM, "Invalid event type 0x%04x", evttype);
flags.set(al::to_underlying(*etype));
}
if(enable)
{
auto 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
{
auto 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};
}
}
AL_API DECL_FUNCEXT2(void, alEventCallback,SOFT, ALEVENTPROCSOFT, void*)
FORCE_ALIGN void AL_APIENTRY alEventCallbackDirectSOFT(ALCcontext *context,
ALEVENTPROCSOFT callback, void *userParam) noexcept
{
std::lock_guard<std::mutex> _{context->mEventCbLock};
context->mEventCb = callback;
context->mEventParam = userParam;
}
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