First Commit

externals/openal-soft/al/event.cpp

@@ -0,0 +1,215 @@
+
+#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(!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(quitnow) UNLIKELY break;
+
+            if(evt.EnumType == AsyncEvent::ReleaseEffectState)
+            {
+                al::intrusive_ptr<EffectState>{evt.u.mEffectState};
+                continue;
+            }
+
+            auto enabledevts = context->mEnabledEvts.load(std::memory_order_acquire);
+            if(!context->mEventCb || !enabledevts.test(evt.EnumType))
+                continue;
+
+            if(evt.EnumType == AsyncEvent::SourceStateChange)
+            {
+                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)
+            {
+                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)
+            {
+                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(!context) UNLIKELY return;
+
+    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{};
+    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.set(AsyncEvent::BufferCompleted);
+            else if(type == AL_EVENT_TYPE_SOURCE_STATE_CHANGED_SOFT)
+                flags.set(AsyncEvent::SourceStateChange);
+            else if(type == AL_EVENT_TYPE_DISCONNECTED_SOFT)
+                flags.set(AsyncEvent::Disconnected);
+            else
+                return false;
+            return true;
+        }
+    );
+    if(bad_type != types_end)
+        return context->setError(AL_INVALID_ENUM, "Invalid event type 0x%04x", *bad_type);
+
+    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};
+    }
+}
+END_API_FUNC
+
+AL_API void AL_APIENTRY alEventCallbackSOFT(ALEVENTPROCSOFT callback, void *userParam)
+START_API_FUNC
+{
+    ContextRef context{GetContextRef()};
+    if(!context) UNLIKELY return;
+
+    std::lock_guard<std::mutex> _{context->mPropLock};
+    std::lock_guard<std::mutex> __{context->mEventCbLock};
+    context->mEventCb = callback;
+    context->mEventParam = userParam;
+}
+END_API_FUNC