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#pragma once
#include <cstdint>
#include <optional>
#include <vector>
#include <functional>
#include <hyprutils/os/FileDescriptor.hpp>
#include "../memory/Memory.hpp"
/*
Hyprland synchronization timelines are based on the wlroots' ones, which
are based on Vk timeline semaphores: https://www.khronos.org/blog/vulkan-timeline-semaphores
*/
struct wl_event_source;
class CSyncTimeline {
public:
static SP<CSyncTimeline> create(int drmFD_);
static SP<CSyncTimeline> create(int drmFD_, int drmSyncobjFD);
~CSyncTimeline();
struct SWaiter {
std::function<void()> fn;
wl_event_source* source = nullptr;
WP<CSyncTimeline> timeline;
Hyprutils::OS::CFileDescriptor eventFd;
};
// check if the timeline point has been signaled
// flags: DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT or DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE
// std::nullopt on fail
std::optional<bool> check(uint64_t point, uint32_t flags);
bool addWaiter(const std::function<void()>& waiter, uint64_t point, uint32_t flags);
void removeWaiter(SWaiter*);
Hyprutils::OS::CFileDescriptor exportAsSyncFileFD(uint64_t src);
bool importFromSyncFileFD(uint64_t dst, Hyprutils::OS::CFileDescriptor& fd);
bool transfer(SP<CSyncTimeline> from, uint64_t fromPoint, uint64_t toPoint);
void signal(uint64_t point);
int drmFD = -1;
uint32_t handle = 0;
WP<CSyncTimeline> self;
private:
CSyncTimeline() = default;
std::vector<SP<SWaiter>> waiters;
};
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