Method begin_frame

native/shared/src/renderer/transient.rs:142–150

Called once at the start of each frame. If the swapchain size changed, invalidates every slot whose size policy is swapchain-relative; fixed-size transients survive.

(&mut self, swap_w: u32, swap_h: u32)

    /// changed, invalidates every slot whose size policy is
    /// swapchain-relative; fixed-size transients survive.
    pub fn begin_frame(&mut self, swap_w: u32, swap_h: u32) {
        if self.swap_size != (swap_w, swap_h) {
            let prev = self.swap_size;
            self.swap_size = (swap_w, swap_h);
            if prev != (0, 0) {
                self.invalidate_swapchain_relative();
            }
        }
    }

    /// Drop every slot whose size policy depends on the swapchain.
    /// Called automatically on resize; callers can also trigger this