Handle AS/MS subobjects explicitly, ignore empty ones. Closes #2193

* If we get passed an empty/degenerate AS or MS we can ignore it, the
  application is responsible for ensuring that it doesn't pass any *actual*
  shaders here.

renderdoc/driver/d3d12/d3d12_common.cpp

@@ -1167,6 +1167,26 @@ D3D12_EXPANDED_PIPELINE_STATE_STREAM_DESC::D3D12_EXPANDED_PIPELINE_STATE_STREAM_
         ITER_ADV(D3D12_VIEW_INSTANCING_DESC);
         break;
       }
+      case D3D12_PIPELINE_STATE_SUBOBJECT_TYPE_AS:
+      {
+        if(ptr->data.shader.BytecodeLength > 0)
+        {
+          RDCERR("AS passed to D3D12_PIPELINE_STATE_STREAM_DESC but mesh shaders not supported");
+          errored = true;
+        }
+        ITER_ADV(D3D12_SHADER_BYTECODE);
+        break;
+      }
+      case D3D12_PIPELINE_STATE_SUBOBJECT_TYPE_MS:
+      {
+        if(ptr->data.shader.BytecodeLength > 0)
+        {
+          RDCERR("MS passed to D3D12_PIPELINE_STATE_STREAM_DESC but mesh shaders not supported");
+          errored = true;
+        }
+        ITER_ADV(D3D12_SHADER_BYTECODE);
+        break;
+      }
       default:
       {
         RDCERR("Unknown subobject type %d", obj->type);

renderdoc/driver/d3d12/d3d12_common.h

@@ -459,6 +459,8 @@ struct D3D12_EXPANDED_PIPELINE_STATE_STREAM_DESC
   // construct from the stream descriptor
   D3D12_EXPANDED_PIPELINE_STATE_STREAM_DESC(const D3D12_PIPELINE_STATE_STREAM_DESC &stream);
 
+  bool errored = false;
+
   // graphics properties
   ID3D12RootSignature *pRootSignature = NULL;
   D3D12_SHADER_BYTECODE VS = {};

renderdoc/driver/d3d12/d3d12_device_wrap2.cpp

@@ -194,6 +194,9 @@ HRESULT WrappedID3D12Device::CreatePipelineState(const D3D12_PIPELINE_STATE_STRE
   D3D12_PACKED_PIPELINE_STATE_STREAM_DESC unwrappedDesc = expandedDesc;
   unwrappedDesc.Unwrap();
 
+  if(expandedDesc.errored)
+    return E_INVALIDARG;
+
   if(ppPipelineState == NULL)
     return m_pDevice3->CreatePipelineState(unwrappedDesc.AsDescStream(), riid, ppPipelineState);