void SDL_GL_GetDrawableSize(SDL_Window * window, int *w, int *h)
{
    CHECK_WINDOW_MAGIC(window, );

    if (_this->GL_GetDrawableSize) {
        _this->GL_GetDrawableSize(_this, window, w, h);
    } else {
        SDL_GetWindowSizeInPixels(window, w, h);
    }
}
[...]
void SDL_Vulkan_GetDrawableSize(SDL_Window *window, int *w, int *h)
{
    CHECK_WINDOW_MAGIC(window, );

    if (_this->Vulkan_GetDrawableSize) {
        _this->Vulkan_GetDrawableSize(_this, window, w, h);
    } else {
        SDL_GetWindowSizeInPixels(window, w, h);
    }
}

device->Vulkan_GetDrawableSize = UIKit_Vulkan_GetDrawableSize;

device->Vulkan_GetDrawableSize = KMSDRM_Vulkan_GetDrawableSize;

device->Vulkan_GetDrawableSize = UIKit_Vulkan_GetDrawableSize;