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Overhaul EmuWindow::PollEvents to fix yuzu-cmd calling SDL_PollEvents off main thread

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EmuWindow::PollEvents was called from the GPU thread (or the CPU thread
in sync-GPU mode) when swapping buffers.  It had three implementations:

- In GRenderWindow, it didn't actually poll events, just set a flag and
  emit a signal to indicate that a frame was displayed.

- In EmuWindow_SDL2_Hide, it did nothing.

- In EmuWindow_SDL2, it did call SDL_PollEvents, but this is wrong
  because SDL_PollEvents is supposed to be called on the thread that set
  up video - in this case, the main thread, which was sleeping in a
  busyloop (regardless of whether sync-GPU was enabled).  On macOS this
  causes a crash.

To fix this:

- Rename EmuWindow::PollEvents to OnFrameDisplayed, and give it a
  default implementation that does nothing.

- In EmuWindow_SDL2, do not override OnFrameDisplayed, but instead have
  the main thread call SDL_WaitEvent in a loop.
This commit is contained in:
comex 2020-11-22 16:05:18 -05:00
parent 5d1447897a
commit 994f497781
10 changed files with 68 additions and 73 deletions
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20
src/yuzu_cmd/emu_window/emu_window_sdl2.h
View file

@ -23,38 +23,38 @@ public:
explicit EmuWindow_SDL2(InputCommon::InputSubsystem* input_subsystem);
~EmuWindow_SDL2();
/// Polls window events
void PollEvents() override;
/// Whether the window is still open, and a close request hasn't yet been sent
bool IsOpen() const;
/// Returns if window is shown (not minimized)
bool IsShown() const override;
/// Wait for the next event on the main thread.
void WaitEvent();
protected:
/// Called by PollEvents when a key is pressed or released.
/// Called by WaitEvent when a key is pressed or released.
void OnKeyEvent(int key, u8 state);
/// Called by PollEvents when the mouse moves.
/// Called by WaitEvent when the mouse moves.
void OnMouseMotion(s32 x, s32 y);
/// Called by PollEvents when a mouse button is pressed or released
/// Called by WaitEvent when a mouse button is pressed or released
void OnMouseButton(u32 button, u8 state, s32 x, s32 y);
/// Translates pixel position (0..1) to pixel positions
std::pair<unsigned, unsigned> TouchToPixelPos(float touch_x, float touch_y) const;
/// Called by PollEvents when a finger starts touching the touchscreen
/// Called by WaitEvent when a finger starts touching the touchscreen
void OnFingerDown(float x, float y);
/// Called by PollEvents when a finger moves while touching the touchscreen
/// Called by WaitEvent when a finger moves while touching the touchscreen
void OnFingerMotion(float x, float y);
/// Called by PollEvents when a finger stops touching the touchscreen
/// Called by WaitEvent when a finger stops touching the touchscreen
void OnFingerUp();
/// Called by PollEvents when any event that may cause the window to be resized occurs
/// Called by WaitEvent when any event that may cause the window to be resized occurs
void OnResize();
/// Called when user passes the fullscreen parameter flag