Don't try to use D3D11 or D3D12 if the window isn't backed with an HWND

Fixes https://github.com/libsdl-org/SDL/issues/10196

src/render/direct3d11/SDL_render_d3d11.c

@@ -2783,6 +2783,11 @@ static int D3D11_CreateRenderer(SDL_Renderer *renderer, SDL_Window *window, SDL_
 {
     D3D11_RenderData *data;
 
+    HWND hwnd = (HWND)SDL_GetProperty(SDL_GetWindowProperties(window), SDL_PROP_WINDOW_WIN32_HWND_POINTER, NULL);
+    if (!hwnd) {
+        return SDL_SetError("Couldn't get window handle");
+    }
+
     SDL_SetupRendererColorspace(renderer, create_props);
 
     if (renderer->output_colorspace != SDL_COLORSPACE_SRGB &&

src/render/direct3d12/SDL_render_d3d12.c

@@ -960,7 +960,7 @@ static HRESULT D3D12_CreateDeviceResources(SDL_Renderer *renderer)
                       D3D_GUID(SDL_IID_IDXGIAdapter4),
                       (void **)&data->dxgiAdapter);
     if (FAILED(result)) {
-        WIN_SetErrorFromHRESULT(SDL_COMPOSE_ERROR("D3D12CreateDevice"), result);
+        WIN_SetErrorFromHRESULT(SDL_COMPOSE_ERROR("IDXGIFactory6::EnumAdapterByGpuPreference"), result);
         goto done;
     }
 
@@ -3232,6 +3232,11 @@ int D3D12_CreateRenderer(SDL_Renderer *renderer, SDL_Window *window, SDL_Propert
 {
     D3D12_RenderData *data;
 
+    HWND hwnd = (HWND)SDL_GetProperty(SDL_GetWindowProperties(window), SDL_PROP_WINDOW_WIN32_HWND_POINTER, NULL);
+    if (!hwnd) {
+        return SDL_SetError("Couldn't get window handle");
+    }
+
     if (SDL_GetWindowFlags(window) & SDL_WINDOW_TRANSPARENT) {
 		/* D3D12 removed the swap effect needed to support transparent windows, use D3D11 instead */
 		return SDL_SetError("The direct3d12 renderer doesn't work with transparent windows");