D3D12 backend: fixed issue with fences not being signaled if there is no command list when flushing the context

3 files changed, 20 insertions, 8 deletions

diff --git a/Graphics/GraphicsEngineD3D12/include/RenderDeviceD3D12Impl.h b/Graphics/GraphicsEngineD3D12/include/RenderDeviceD3D12Impl.h
index 9a70e68d..b447fdc5 100644
--- a/Graphics/GraphicsEngineD3D12/include/RenderDeviceD3D12Impl.h
+++ b/Graphics/GraphicsEngineD3D12/include/RenderDeviceD3D12Impl.h
@@ -85,6 +85,8 @@ public:
     PooledCommandContext AllocateCommandContext(const Char* ID = "");
     void CloseAndExecuteTransientCommandContext(Uint32 CommandQueueIndex, PooledCommandContext&& Ctx);
     Uint64 CloseAndExecuteCommandContext(Uint32 QueueIndex, PooledCommandContext&& Ctx, bool DiscardStaleObjects, std::vector<std::pair<Uint64, RefCntAutoPtr<IFence> > >* pSignalFences);
+
+    void SignalFences(Uint32 QueueIndex, std::vector<std::pair<Uint64, RefCntAutoPtr<IFence> > >& SignalFences);
     
     void WaitForFence(Uint32 QueueIndex, IFence* pFence, Uint64 Value);
 
diff --git a/Graphics/GraphicsEngineD3D12/src/DeviceContextD3D12Impl.cpp b/Graphics/GraphicsEngineD3D12/src/DeviceContextD3D12Impl.cpp
index 7daa6437..1a654109 100644
--- a/Graphics/GraphicsEngineD3D12/src/DeviceContextD3D12Impl.cpp
+++ b/Graphics/GraphicsEngineD3D12/src/DeviceContextD3D12Impl.cpp
@@ -594,6 +594,13 @@ namespace Diligent
                 pDeviceD3D12Impl->DisposeCommandContext(std::move(m_CurrCmdCtx));
         }
 
+        // If there is no command list to submit, but there are pending fences, we need to signal them now
+        if (!m_PendingFences.empty())
+        {
+            pDeviceD3D12Impl->SignalFences(m_CommandQueueId, m_PendingFences);
+            m_PendingFences.clear();
+        }
+
         if(RequestNewCmdCtx)
             RequestCommandContext(pDeviceD3D12Impl);
 
diff --git a/Graphics/GraphicsEngineD3D12/src/RenderDeviceD3D12Impl.cpp b/Graphics/GraphicsEngineD3D12/src/RenderDeviceD3D12Impl.cpp
index 0b04c709..8ad14c16 100644
--- a/Graphics/GraphicsEngineD3D12/src/RenderDeviceD3D12Impl.cpp
+++ b/Graphics/GraphicsEngineD3D12/src/RenderDeviceD3D12Impl.cpp
@@ -179,14 +179,7 @@ Uint64 RenderDeviceD3D12Impl::CloseAndExecuteCommandContext(Uint32 QueueIndex, P
         auto SubmittedCmdBuffInfo = TRenderDeviceBase::SubmitCommandBuffer(QueueIndex, pCmdList, true);
         FenceValue = SubmittedCmdBuffInfo.FenceValue;
         if (pSignalFences != nullptr)
-        {
-            for (auto& val_fence : *pSignalFences)
-            {
-                auto* pFenceD3D12Impl = val_fence.second.RawPtr<FenceD3D12Impl>();
-                auto* pd3d12Fence = pFenceD3D12Impl->GetD3D12Fence();
-                m_CommandQueues[QueueIndex].CmdQueue->SignalFence(pd3d12Fence, val_fence.first);
-            }
-        }
+            SignalFences(QueueIndex, *pSignalFences);
     }
 
 	m_CmdListManager.ReleaseAllocator(std::move(pAllocator), QueueIndex, FenceValue);
@@ -197,6 +190,16 @@ Uint64 RenderDeviceD3D12Impl::CloseAndExecuteCommandContext(Uint32 QueueIndex, P
     return FenceValue;
 }
 
+void RenderDeviceD3D12Impl::SignalFences(Uint32 QueueIndex, std::vector<std::pair<Uint64, RefCntAutoPtr<IFence> > >& SignalFences)
+{
+    for (auto& val_fence : SignalFences)
+    {
+        auto* pFenceD3D12Impl = val_fence.second.RawPtr<FenceD3D12Impl>();
+        auto* pd3d12Fence = pFenceD3D12Impl->GetD3D12Fence();
+        m_CommandQueues[QueueIndex].CmdQueue->SignalFence(pd3d12Fence, val_fence.first);
+    }
+}
+
 void RenderDeviceD3D12Impl::WaitForFence(Uint32 QueueIndex, IFence* pFence, Uint64 Value)
 {
     VERIFY_EXPR(QueueIndex < m_CmdQueueCount);