[Testbed] Temporarily disable multi-threading test for D3D12 as state…

…-tracking is incomplete.

The index/vertex buffer state tracking does not work with multi-threaded command lists in LLGL/D3D12.

tests/Testbed/UnitTests/TestCommandBufferMultiThreading.cpp

@@ -57,6 +57,10 @@ DEF_TEST( CommandBufferMultiThreading )
  constexpr unsigned numFrames = 10;
  constexpr int diffThreshold = 30; // Diff threshold of 30, because sampling MIP-mapped textures is backend dependent
 
+ //TODO: temporarily disable this test for D3D12 as state tracking does not work with multi-threading
+ if (renderer->GetRendererID() == RendererID::Direct3D12)
+ return TestResult::Skipped;
+
  if (shaders[VSTextured] == nullptr || shaders[PSTextured] == nullptr)
  {
  Log::Errorf("Missing shaders for backend\n");