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#include "config.h"
#include <algorithm>
#include <atomic>
#include <cstring>
#include <exception>
#include <memory>
#include <mutex>
#include <new>
#include <string>
#include <thread>
#include "AL/al.h"
#include "AL/alc.h"
#include "alError.h"
#include "albyte.h"
#include "alcmain.h"
#include "alcontext.h"
#include "alexcpt.h"
#include "almalloc.h"
#include "effects/base.h"
#include "inprogext.h"
#include "logging.h"
#include "opthelpers.h"
#include "ringbuffer.h"
#include "threads.h"
static int EventThread(ALCcontext *context)
{
RingBuffer *ring{context->AsyncEvents.get()};
bool quitnow{false};
while(LIKELY(!quitnow))
{
auto evt_data = ring->getReadVector().first;
if(evt_data.len == 0)
{
context->EventSem.wait();
continue;
}
std::lock_guard<std::mutex> _{context->EventCbLock};
do {
auto &evt = *reinterpret_cast<AsyncEvent*>(evt_data.buf);
evt_data.buf += sizeof(AsyncEvent);
evt_data.len -= 1;
/* This automatically destructs the event object and advances the
* ringbuffer's read offset at the end of scope.
*/
const struct EventAutoDestructor {
AsyncEvent &evt_;
RingBuffer *ring_;
~EventAutoDestructor()
{
al::destroy_at(&evt_);
ring_->readAdvance(1);
}
} _{evt, ring};
quitnow = evt.EnumType == EventType_KillThread;
if(UNLIKELY(quitnow)) break;
if(evt.EnumType == EventType_ReleaseEffectState)
{
evt.u.mEffectState->DecRef();
continue;
}
ALbitfieldSOFT enabledevts{context->EnabledEvts.load(std::memory_order_acquire)};
if(!context->EventCb) continue;
if(evt.EnumType == EventType_SourceStateChange)
{
if(!(enabledevts&EventType_SourceStateChange))
continue;
std::string msg{"Source ID " + std::to_string(evt.u.srcstate.id)};
msg += " state has changed to ";
msg += (evt.u.srcstate.state==AL_INITIAL) ? "AL_INITIAL" :
(evt.u.srcstate.state==AL_PLAYING) ? "AL_PLAYING" :
(evt.u.srcstate.state==AL_PAUSED) ? "AL_PAUSED" :
(evt.u.srcstate.state==AL_STOPPED) ? "AL_STOPPED" : "<unknown>";
context->EventCb(AL_EVENT_TYPE_SOURCE_STATE_CHANGED_SOFT, evt.u.srcstate.id,
evt.u.srcstate.state, static_cast<ALsizei>(msg.length()), msg.c_str(),
context->EventParam
);
}
else if(evt.EnumType == EventType_BufferCompleted)
{
if(!(enabledevts&EventType_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->EventCb(AL_EVENT_TYPE_BUFFER_COMPLETED_SOFT, evt.u.bufcomp.id,
evt.u.bufcomp.count, static_cast<ALsizei>(msg.length()), msg.c_str(),
context->EventParam
);
}
else if((enabledevts&evt.EnumType) == evt.EnumType)
context->EventCb(evt.u.user.type, evt.u.user.id, evt.u.user.param,
static_cast<ALsizei>(strlen(evt.u.user.msg)), evt.u.user.msg,
context->EventParam
);
} while(evt_data.len != 0);
}
return 0;
}
void StartEventThrd(ALCcontext *ctx)
{
try {
ctx->EventThread = 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)
{
static constexpr AsyncEvent kill_evt{EventType_KillThread};
RingBuffer *ring{ctx->AsyncEvents.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);
}
new (evt_data.buf) AsyncEvent{kill_evt};
ring->writeAdvance(1);
ctx->EventSem.post();
if(ctx->EventThread.joinable())
ctx->EventThread.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) SETERR_RETURN(context.get(), AL_INVALID_VALUE,, "Controlling %d events", count);
if(count == 0) return;
if(!types) SETERR_RETURN(context.get(), AL_INVALID_VALUE,, "NULL pointer");
ALbitfieldSOFT 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 |= EventType_BufferCompleted;
else if(type == AL_EVENT_TYPE_SOURCE_STATE_CHANGED_SOFT)
flags |= EventType_SourceStateChange;
else if(type == AL_EVENT_TYPE_ERROR_SOFT)
flags |= EventType_Error;
else if(type == AL_EVENT_TYPE_PERFORMANCE_SOFT)
flags |= EventType_Performance;
else if(type == AL_EVENT_TYPE_DEPRECATED_SOFT)
flags |= EventType_Deprecated;
else if(type == AL_EVENT_TYPE_DISCONNECTED_SOFT)
flags |= EventType_Disconnected;
else
return false;
return true;
}
);
if(bad_type != types_end)
SETERR_RETURN(context.get(), AL_INVALID_ENUM,, "Invalid event type 0x%04x", *bad_type);
if(enable)
{
ALbitfieldSOFT enabledevts{context->EnabledEvts.load(std::memory_order_relaxed)};
while(context->EnabledEvts.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
{
ALbitfieldSOFT enabledevts{context->EnabledEvts.load(std::memory_order_relaxed)};
while(context->EnabledEvts.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->EventCbLock};
}
}
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->PropLock};
std::lock_guard<std::mutex> __{context->EventCbLock};
context->EventCb = callback;
context->EventParam = userParam;
}
END_API_FUNC
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