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#include "drape_frontend/base_renderer.hpp"
#include "drape_frontend/message_subclasses.hpp"
#include <utility>
#if defined(OMIM_METAL_AVAILABLE)
namespace dp
{
extern void RenderFrameMediator(std::function<void()> && renderFrameFunction);
} // namespace dp
#define RENDER_FRAME_MEDIATOR(renderFunction) dp::RenderFrameMediator([this]{ renderFunction; });
#else
#define RENDER_FRAME_MEDIATOR(renderFunction) renderFunction;
#endif
namespace df
{
// static
std::atomic<uint8_t> BaseRenderer::m_contextCounter(0);
BaseRenderer::BaseRenderer(ThreadsCommutator::ThreadName name, Params const & params)
: m_apiVersion(params.m_apiVersion)
, m_commutator(params.m_commutator)
, m_contextFactory(params.m_oglContextFactory)
, m_texMng(params.m_texMng)
, m_threadName(name)
, m_isEnabled(true)
, m_renderingEnablingCompletionHandler(nullptr)
, m_wasNotified(false)
, m_wasContextReset(false)
, m_onGraphicsContextInitialized(params.m_onGraphicsContextInitialized)
{
m_commutator->RegisterThread(m_threadName, this);
}
void BaseRenderer::StartThread()
{
m_selfThread.Create(CreateRoutine());
}
void BaseRenderer::StopThread()
{
// stop rendering and close queue
m_selfThread.GetRoutine()->Cancel();
CloseQueue();
// wake up render thread if necessary
if (!m_isEnabled)
{
WakeUp();
}
// wait for render thread completion
m_selfThread.Join();
}
void BaseRenderer::IterateRenderLoop()
{
RENDER_FRAME_MEDIATOR(IterateRenderLoopImpl());
}
void BaseRenderer::IterateRenderLoopImpl()
{
RenderFrame();
CheckRenderingEnabled();
}
void BaseRenderer::SetRenderingEnabled(ref_ptr<dp::GraphicsContextFactory> contextFactory)
{
if (m_wasContextReset && contextFactory != nullptr)
m_contextFactory = contextFactory;
SetRenderingEnabled(true);
}
void BaseRenderer::SetRenderingDisabled(bool const destroySurface)
{
if (destroySurface)
m_wasContextReset = true;
SetRenderingEnabled(false);
}
bool BaseRenderer::IsRenderingEnabled() const
{
return m_isEnabled;
}
void BaseRenderer::SetRenderingEnabled(bool const isEnabled)
{
if (isEnabled == m_isEnabled)
return;
// here we have to wait for completion of internal SetRenderingEnabled
std::mutex completionMutex;
std::condition_variable completionCondition;
bool notified = false;
auto handler = [&]()
{
std::lock_guard<std::mutex> lock(completionMutex);
notified = true;
completionCondition.notify_one();
};
{
std::lock_guard<std::mutex> lock(m_completionHandlerMutex);
m_renderingEnablingCompletionHandler = std::move(handler);
}
if (isEnabled)
{
// wake up rendering thread
WakeUp();
}
else
{
// here we set up value only if rendering disabled
m_isEnabled = false;
// if renderer thread is waiting for message let it go
CancelMessageWaiting();
}
std::unique_lock<std::mutex> lock(completionMutex);
completionCondition.wait(lock, [¬ified] { return notified; });
}
bool BaseRenderer::FilterContextDependentMessage(ref_ptr<Message> msg)
{
return msg->IsGraphicsContextDependent();
}
void BaseRenderer::CreateContext()
{
OnContextCreate();
m_contextCounter++;
uint8_t constexpr kContextCount = 2;
if (m_contextCounter == kContextCount && m_onGraphicsContextInitialized)
m_onGraphicsContextInitialized();
}
void BaseRenderer::CheckRenderingEnabled()
{
if (!m_isEnabled)
{
dp::GraphicsContext * context = nullptr;
if (m_wasContextReset)
{
using namespace std::placeholders;
EnableMessageFiltering(std::bind(&BaseRenderer::FilterContextDependentMessage, this, _1));
OnContextDestroy();
CHECK(m_contextCounter > 0, ());
m_contextCounter--;
}
else
{
bool const isDrawContext = m_threadName == ThreadsCommutator::RenderThread;
context = isDrawContext ? m_contextFactory->GetDrawContext() :
m_contextFactory->GetResourcesUploadContext();
context->SetRenderingEnabled(false);
}
OnRenderingDisabled();
// notify initiator-thread about rendering disabling
Notify();
// wait for signal
std::unique_lock<std::mutex> lock(m_renderingEnablingMutex);
m_renderingEnablingCondition.wait(lock, [this] { return m_wasNotified; });
m_wasNotified = false;
bool needCreateContext = false;
if (!m_selfThread.GetRoutine()->IsCancelled())
{
// here rendering is enabled again
m_isEnabled = true;
if (m_wasContextReset)
{
m_wasContextReset = false;
needCreateContext = true;
}
else
{
context->SetRenderingEnabled(true);
}
}
if (needCreateContext)
DisableMessageFiltering();
// notify initiator-thread about rendering enabling
// m_renderingEnablingCompletionHandler will be setup before awakening of this thread
Notify();
OnRenderingEnabled();
if (needCreateContext)
CreateContext();
}
}
void BaseRenderer::Notify()
{
std::function<void()> handler;
{
std::lock_guard<std::mutex> lock(m_completionHandlerMutex);
handler = std::move(m_renderingEnablingCompletionHandler);
m_renderingEnablingCompletionHandler = nullptr;
}
if (handler != nullptr)
handler();
}
void BaseRenderer::WakeUp()
{
std::lock_guard<std::mutex> lock(m_renderingEnablingMutex);
m_wasNotified = true;
m_renderingEnablingCondition.notify_one();
}
bool BaseRenderer::CanReceiveMessages()
{
threads::IRoutine * routine = m_selfThread.GetRoutine();
return routine != nullptr && !routine->IsCancelled();
}
} // namespace df
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