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wayland: Add support for the SDL_MOUSE_RELATIVE_SYSTEM_SCALE hint

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The relative pointer protocol sends both the accelerated and unaccelerated deltas, so select between them based on the hint value.
This commit is contained in:
Frank Praznik 2024-12-19 12:04:29 -05:00
parent d6a95ae198
commit fce922b66c
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1 changed files with 10 additions and 5 deletions
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15
src/video/wayland/SDL_waylandevents.c
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@ -3042,17 +3042,22 @@ static void relative_pointer_handle_relative_motion(void *data,
struct SDL_WaylandInput *input = data;
SDL_VideoData *d = input->display;
SDL_WindowData *window = input->pointer_focus;
double dx_unaccel;
double dy_unaccel;
double dx;
double dy;
// Relative pointer event times are in microsecond granularity.
const Uint64 timestamp = SDL_US_TO_NS(((Uint64)time_hi << 32) | (Uint64)time_lo);
dx_unaccel = wl_fixed_to_double(dx_unaccel_w);
dy_unaccel = wl_fixed_to_double(dy_unaccel_w);
if (!SDL_GetMouse()->enable_relative_system_scale) {
dx = wl_fixed_to_double(dx_unaccel_w);
dy = wl_fixed_to_double(dy_unaccel_w);
} else {
dx = wl_fixed_to_double(dx_w);
dy = wl_fixed_to_double(dy_w);
}
if (input->pointer_focus && d->relative_mouse_mode) {
SDL_SendMouseMotion(Wayland_GetEventTimestamp(timestamp), window->sdlwindow, input->pointer_id, true, (float)dx_unaccel, (float)dy_unaccel);
SDL_SendMouseMotion(Wayland_GetEventTimestamp(timestamp), window->sdlwindow, input->pointer_id, true, (float)dx, (float)dy);
}
}