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#include "swapchain_monitor.hh"
#include "device_context.hh"
#include "helper.hh"
#include <chrono>
#include <vulkan/vulkan_core.h>
#include <functional>
#include <mutex>
namespace low_latency {
SwapchainMonitor::SwapchainMonitor(const DeviceContext& device,
const bool was_low_latency_requested)
: device(device), was_low_latency_requested(was_low_latency_requested) {}
SwapchainMonitor::~SwapchainMonitor() {}
void SwapchainMonitor::update_params(
const bool was_low_latency_requested,
const std::chrono::microseconds present_delay) {
const auto lock = std::scoped_lock{this->mutex};
this->was_low_latency_requested = was_low_latency_requested;
this->present_delay = present_delay;
}
void SwapchainMonitor::prune_submissions() {
// If our submissions grow too large, we should delete them from our
// tracking. It would be nice if this was handled elegantly by some custom
// container and we didn't have to call this manually each time we insert.
// Also this exact logic is repeated in QueueContext's Submission.
if (std::size(this->in_flight_submissions) >
this->MAX_TRACKED_IN_FLIGHT_SUBMISSIONS) {
this->in_flight_submissions.pop_front();
}
}
ReflexSwapchainMonitor::ReflexSwapchainMonitor(
const DeviceContext& device, const bool was_low_latency_requested)
: SwapchainMonitor(device, was_low_latency_requested),
monitor_worker(
std::bind_front(&ReflexSwapchainMonitor::do_monitor, this)) {}
ReflexSwapchainMonitor::~ReflexSwapchainMonitor() {}
void ReflexSwapchainMonitor::WakeupSemaphore::signal(
const DeviceContext& device) const {
const auto ssi =
VkSemaphoreSignalInfo{.sType = VK_STRUCTURE_TYPE_SEMAPHORE_SIGNAL_INFO,
.semaphore = this->timeline_semaphore,
.value = this->value};
THROW_NOT_VKSUCCESS(device.vtable.SignalSemaphore(device.device, &ssi));
}
void ReflexSwapchainMonitor::do_monitor(const std::stop_token stoken) {
for (;;) {
auto lock = std::unique_lock{this->mutex};
this->cv.wait(lock, stoken,
[&]() { return !this->semaphore_submissions.empty(); });
// No work implies stopped so break immediately.
if (this->semaphore_submissions.empty()) {
break;
}
// Pop the oldest semaphore we want to signal off the queue.
const auto semaphore_submission =
std::move(this->semaphore_submissions.front());
this->semaphore_submissions.pop_front();
// If we're stopping, signal the semaphore and don't worry about work
// actually completing.
if (stoken.stop_requested()) {
semaphore_submission.wakeup_semaphore.signal(this->device);
break;
}
// Unlock, wait for work to finish, signal semaphore.
lock.unlock();
semaphore_submission.submissions->await_completed();
semaphore_submission.wakeup_semaphore.signal(this->device);
}
}
void ReflexSwapchainMonitor::notify_semaphore(
const VkSemaphore& timeline_semaphore, const std::uint64_t& value) {
auto lock = std::unique_lock{this->mutex};
const auto wakeup_semaphore = WakeupSemaphore{
.timeline_semaphore = timeline_semaphore, .value = value};
// Signal immediately if reflex is off or it's a no-op submit.
if (!this->was_low_latency_requested ||
this->in_flight_submissions.empty()) {
wakeup_semaphore.signal(this->device);
return;
}
// Signal immediately if our outstanding work has already completed.
if (this->in_flight_submissions.back()->has_completed()) {
this->in_flight_submissions.clear();
wakeup_semaphore.signal(this->device);
return;
}
this->semaphore_submissions.emplace_back(SemaphoreSubmissions{
.wakeup_semaphore = wakeup_semaphore,
.submissions = std::move(this->in_flight_submissions.back()),
});
this->in_flight_submissions.clear();
lock.unlock();
this->cv.notify_one();
}
void ReflexSwapchainMonitor::notify_present(
std::unique_ptr<QueueContext::Submissions> submissions) {
const auto lock = std::scoped_lock{this->mutex};
if (!this->was_low_latency_requested) {
return;
}
this->in_flight_submissions.emplace_back(std::move(submissions));
this->prune_submissions();
}
AntiLagSwapchainMonitor::AntiLagSwapchainMonitor(
const DeviceContext& device, const bool was_low_latency_requested)
: SwapchainMonitor(device, was_low_latency_requested) {}
AntiLagSwapchainMonitor::~AntiLagSwapchainMonitor() {}
void AntiLagSwapchainMonitor::notify_present(
std::unique_ptr<QueueContext::Submissions> submissions) {
const auto lock = std::scoped_lock{this->mutex};
if (!this->was_low_latency_requested) {
return;
}
this->in_flight_submissions.emplace_back(std::move(submissions));
this->prune_submissions();
}
void AntiLagSwapchainMonitor::await_submissions() {
auto lock = std::unique_lock{this->mutex};
if (this->in_flight_submissions.empty()) {
return;
}
const auto last = std::move(this->in_flight_submissions.back());
this->in_flight_submissions.clear();
lock.unlock();
last->await_completed();
}
} // namespace low_latency
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