Gate RGB565 behind version checks

Author: ZivDero

src/render/direct3d11/SDL_render_d3d11.c

@@ -2899,7 +2899,11 @@ static bool D3D11_CreateRenderer(SDL_Renderer *renderer, SDL_Window *window, SDL
     SDL_AddSupportedTextureFormat(renderer, SDL_PIXELFORMAT_NV12);
     SDL_AddSupportedTextureFormat(renderer, SDL_PIXELFORMAT_NV21);
     SDL_AddSupportedTextureFormat(renderer, SDL_PIXELFORMAT_P010);
-    SDL_AddSupportedTextureFormat(renderer, SDL_PIXELFORMAT_RGB565);
+
+    // DXGI_FORMAT_B5G6R5_UNORM is supported since Direct3D 11.1 on Windows 8 and later
+    if (data->featureLevel >= D3D_FEATURE_LEVEL_11_1 && WIN_IsWindows8OrGreater()) {
+        SDL_AddSupportedTextureFormat(renderer, SDL_PIXELFORMAT_RGB565);
+    }
 
     data->swapChainFlags = 0;
     data->syncInterval = 0;