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Workaround for Windows occasionally ignoring SetCursorPos() calls

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Also, since we're flushing mouse motion before and including the warp, we don't need the isWin10FCUorNewer hack to simulate mouse warp motion.

Fixes https://github.com/libsdl-org/SDL/issues/4339 and https://github.com/libsdl-org/SDL/issues/4165
This commit is contained in:
Sam Lantinga 2021-10-08 10:05:27 -07:00
parent 373216ae5b
commit 40ed9f75c9
3 changed files with 19 additions and 26 deletions
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21
src/video/windows/SDL_windowsevents.c
View file

@ -477,11 +477,6 @@ ShouldGenerateWindowCloseOnAltF4(void)
return !SDL_GetHintBoolean(SDL_HINT_WINDOWS_NO_CLOSE_ON_ALT_F4, SDL_FALSE);
}
/* Win10 "Fall Creators Update" introduced the bug that SetCursorPos() (as used by SDL_WarpMouseInWindow())
doesn't reliably generate WM_MOUSEMOVE events anymore (see #3931) which breaks relative mouse mode via warping.
This is used to implement a workaround.. */
static SDL_bool isWin10FCUorNewer = SDL_FALSE;
/* We want to generate mouse events from mouse and pen, and touch events from touchscreens */
#define MI_WP_SIGNATURE 0xFF515700
#define MI_WP_SIGNATURE_MASK 0xFFFFFF00
@ -581,7 +576,7 @@ WarpWithinBoundsRect(int x, int y, RECT *bounds)
} else {
warpY = SDL_clamp(y, targetTop, targetBottom);
}
SetCursorPos(warpX, warpY);
WIN_SetCursorPos(warpX, warpY);
}
}
}
@ -752,18 +747,6 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
if (GetMouseMessageSource() != SDL_MOUSE_EVENT_SOURCE_TOUCH &&
lParam != data->last_pointer_update) {
SDL_SendMouseMotion(data->window, 0, 0, GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
if (isWin10FCUorNewer && mouse->relative_mode_warp &&
(data->window->flags & SDL_WINDOW_INPUT_FOCUS) != 0) {
/* To work around #3931, Win10 bug introduced in Fall Creators Update, where
SetCursorPos() (SDL_WarpMouseInWindow()) doesn't reliably generate mouse events anymore,
after each windows mouse event generate a fake event for the middle of the window
if relative_mode_warp is used */
int center_x = 0, center_y = 0;
SDL_GetWindowSize(data->window, &center_x, &center_y);
center_x /= 2;
center_y /= 2;
SDL_SendMouseMotion(data->window, 0, 0, center_x, center_y);
}
}
}
}
@ -1703,8 +1686,6 @@ SDL_RegisterApp(char *name, Uint32 style, void *hInst)
return SDL_SetError("Couldn't register application class");
}
isWin10FCUorNewer = IsWin10FCUorNewer();
app_registered = 1;
return 0;
}

23
src/video/windows/SDL_windowsmouse.c
View file

@ -236,6 +236,21 @@ WIN_ShowCursor(SDL_Cursor * cursor)
return 0;
}
void
WIN_SetCursorPos(int x, int y)
{
/* We need to jitter the value because otherwise Windows will occasionally inexplicably ignore the SetCursorPos() or SendInput() */
SetCursorPos(x, y);
SetCursorPos(x+1, y);
SetCursorPos(x, y);
/* Flush any mouse motion prior to or associated with this warp */
SDL_last_warp_time = GetTickCount();
if (!SDL_last_warp_time) {
SDL_last_warp_time = 1;
}
}
static void
WIN_WarpMouse(SDL_Window * window, int x, int y)
{
@ -251,13 +266,9 @@ WIN_WarpMouse(SDL_Window * window, int x, int y)
pt.x = x;
pt.y = y;
ClientToScreen(hwnd, &pt);
SetCursorPos(pt.x, pt.y);
WIN_SetCursorPos(pt.x, pt.y);
/* Flush any pending mouse motion and simulate motion for this warp */
SDL_last_warp_time = GetTickCount();
if (!SDL_last_warp_time) {
SDL_last_warp_time = 1;
}
/* Send the exact mouse motion associated with this warp */
SDL_SendMouseMotion(window, SDL_GetMouse()->mouseID, 0, x, y);
}

1
src/video/windows/SDL_windowsmouse.h
View file

@ -28,6 +28,7 @@ extern HCURSOR SDL_cursor;
extern void WIN_InitMouse(_THIS);
extern void WIN_QuitMouse(_THIS);
extern void WIN_SetCursorPos(int x, int y);
#endif /* SDL_windowsmouse_h_ */