mirror of
https://github.com/moonlight-stream/moonlight-qt
synced 2024-12-17 22:53:06 +00:00
78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
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#include "waylandvsyncsource.h"
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#include <SDL_syswm.h>
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const struct wl_callback_listener WaylandVsyncSource::s_FrameListener = {
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.done = WaylandVsyncSource::frameDone,
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};
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WaylandVsyncSource::WaylandVsyncSource(Pacer* pacer)
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: m_Pacer(pacer),
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m_Display(nullptr),
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m_Surface(nullptr),
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m_Callback(nullptr),
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m_LastFrameTime(0)
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{
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}
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WaylandVsyncSource::~WaylandVsyncSource()
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{
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if (m_Callback != nullptr) {
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wl_callback_destroy(m_Callback);
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wl_display_roundtrip(m_Display);
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}
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}
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bool WaylandVsyncSource::initialize(SDL_Window* window, int displayFps)
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{
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SDL_SysWMinfo info;
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SDL_VERSION(&info.version);
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if (!SDL_GetWindowWMInfo(window, &info)) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
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"SDL_GetWindowWMInfo() failed: %s",
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SDL_GetError());
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return false;
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}
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// Pacer shoud not create us for non-Wayland windows
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SDL_assert(info.subsystem == SDL_SYSWM_WAYLAND);
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m_DisplayFps = displayFps;
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m_Display = info.info.wl.display;
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m_Surface = info.info.wl.surface;
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// Enqueue our first frame callback
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m_Callback = wl_surface_frame(m_Surface);
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wl_callback_add_listener(m_Callback, &s_FrameListener, this);
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wl_surface_commit(m_Surface);
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return true;
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}
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void WaylandVsyncSource::frameDone(void* data, struct wl_callback* oldCb, uint32_t time)
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{
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auto me = (WaylandVsyncSource*)data;
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// Free this callback
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SDL_assert(oldCb == me->m_Callback);
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wl_callback_destroy(oldCb);
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// Register for another callback before invoking Pacer to ensure we don't miss
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// a frame callback if Pacer takes too long.
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me->m_Callback = wl_surface_frame(me->m_Surface);
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wl_callback_add_listener(me->m_Callback, &s_FrameListener, data);
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wl_surface_commit(me->m_Surface);
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wl_display_flush(me->m_Display);
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if (me->m_LastFrameTime != 0) {
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// Assuming that the time until the next V-Sync will usually be equal to the
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// time from last callback to this one but cap it at 2x the expected frame period.
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me->m_Pacer->vsyncCallback(SDL_min(time - me->m_LastFrameTime, 2000 / me->m_DisplayFps));
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}
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me->m_LastFrameTime = time;
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}
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