[idd] d3d: add leased D3D11 texture interop

idd/LGIdd/LGIdd.vcxproj

@@ -51,6 +51,7 @@
     <ClCompile Include="capture\CHardwareFrameProcessor.cpp" />
     <ClCompile Include="capture\CSoftwareFrameProcessor.cpp" />
     <ClCompile Include="capture\CSwapChainProcessor.cpp" />
+    <ClCompile Include="d3d\CInteropPool.cpp" />
     <ClCompile Include="d3d\CD3D11Device.cpp" />
     <ClCompile Include="d3d\CD3D12CommandQueue.cpp" />
     <ClCompile Include="d3d\CD3D12Device.cpp" />
@@ -106,6 +107,7 @@
     <ClInclude Include="capture\CHardwareFrameProcessor.h" />
     <ClInclude Include="capture\CSoftwareFrameProcessor.h" />
     <ClInclude Include="capture\CSwapChainProcessor.h" />
+    <ClInclude Include="d3d\CInteropPool.h" />
     <ClInclude Include="d3d\CD3D11Device.h" />
     <ClInclude Include="d3d\CD3D12CommandQueue.h" />
     <ClInclude Include="d3d\CD3D12Device.h" />

idd/LGIdd/LGIdd.vcxproj.filters

@@ -124,6 +124,9 @@
     <ClInclude Include="capture\CSwapChainProcessor.h">
       <Filter>Capture</Filter>
     </ClInclude>
+    <ClInclude Include="d3d\CInteropPool.h">
+      <Filter>D3D</Filter>
+    </ClInclude>
     <ClInclude Include="d3d\CD3D11Device.h">
       <Filter>D3D</Filter>
     </ClInclude>
@@ -303,6 +306,9 @@
     <ClCompile Include="capture\CSwapChainProcessor.cpp">
       <Filter>Capture</Filter>
     </ClCompile>
+    <ClCompile Include="d3d\CInteropPool.cpp">
+      <Filter>D3D</Filter>
+    </ClCompile>
     <ClCompile Include="d3d\CD3D11Device.cpp">
       <Filter>D3D</Filter>
     </ClCompile>

idd/LGIdd/capture/CFrameGraph.cpp

@@ -313,6 +313,17 @@ bool CFrameGraph::Want(FrameSignal signal) const
   return false;
 }
 
+bool CFrameGraph::Shared(unsigned node) const
+{
+  if (!m_sealed || !node || node >= m_nodeCount)
+    return false;
+  for (unsigned i = 0; i < m_leafCount; ++i)
+    if (m_leaves[i].node                == node &&
+        m_leaves[i].cfg.profile.storage == FrameStorage::D3D11_TEXTURE)
+      return true;
+  return false;
+}
+
 bool CFrameGraph::Desc(unsigned leaf, const FrameContentRef& content,
   LeafDesc& desc) const
 {

idd/LGIdd/capture/CFrameGraph.h

@@ -153,6 +153,7 @@ public:
   bool Same(const GraphCfg& cfg) const;
   bool Want(FrameSignal signal) const;
   bool Need(FrameOp op) const;
+  bool Shared(unsigned node) const;
   bool Desc(unsigned leaf, const FrameContentRef& content,
     LeafDesc& desc) const;
 

idd/LGIdd/capture/CFrameTex.cpp

@@ -97,6 +97,7 @@ struct CTexCore
   FrameProfile           profile;
   D3D12_RESOURCE_DESC    desc     = {};
   D3D12_RESOURCE_STATES  read     = D3D12_RESOURCE_STATE_COMMON;
+  bool                   shared   = false;
   Slot                   slots[CTexPool::MAX_SLOTS];
 
   TexResult Acquire(unsigned& index, uint64_t& generation)
@@ -279,10 +280,11 @@ CFrameTex::CFrameTex(uint64_t graphValue, uint64_t poolValue,
   unsigned nodeValue, unsigned slotValue, uint64_t versionValue,
   const FrameProfile& profileValue,
   const FrameDesc& frameValue, const ComPtr<ID3D12Resource>& res,
-  const D12Sync& sync, D3D12_RESOURCE_STATES state) :
+  const D12Sync& sync, D3D12_RESOURCE_STATES state, bool sharedValue) :
   m_res(res),
   m_sync(sync),
   m_state(state),
+  m_shared(sharedValue),
   graph(graphValue),
   pool(poolValue),
   node(nodeValue),
@@ -389,7 +391,7 @@ bool TexWrite::Seal(const FrameDesc& frame, const D12Sync& sync,
 
   CFrameTex * raw = new (std::nothrow) CFrameTex(core->graph, core->id,
     core->node, m_index, m_version, core->profile, desc, resource, sync,
-    core->read);
+    core->read, core->shared);
   if (!raw)
   {
     core->Drop(index, generation);
@@ -429,7 +431,7 @@ void TexWrite::Cancel()
 TexResult CTexPool::Init(ID3D12Device3 * device, uint64_t graph,
   unsigned node, const FrameProfile& profile,
   const D3D12_RESOURCE_DESC& desc, D3D12_RESOURCE_STATES state,
-  unsigned slots)
+  unsigned slots, bool shared)
 {
   if (!device || !graph || !node || !slots || slots > MAX_SLOTS     ||
       profile.storage         != FrameStorage::D3D12_TEXTURE        ||
@@ -468,6 +470,7 @@ TexResult CTexPool::Init(ID3D12Device3 * device, uint64_t graph,
   core->profile = profile;
   core->desc    = desc;
   core->read    = state;
+  core->shared  = shared;
 
   D3D12_HEAP_PROPERTIES heap = {};
   heap.Type                 = D3D12_HEAP_TYPE_DEFAULT;
@@ -478,8 +481,12 @@ TexResult CTexPool::Init(ID3D12Device3 * device, uint64_t graph,
 
   for (unsigned i = 0; i < slots; ++i)
   {
+    const D3D12_HEAP_FLAGS flags = shared ?
+      static_cast<D3D12_HEAP_FLAGS>(D3D12_HEAP_FLAG_SHARED |
+        D3D12_HEAP_FLAG_CREATE_NOT_ZEROED) :
+      D3D12_HEAP_FLAG_CREATE_NOT_ZEROED;
     const HRESULT hr = device->CreateCommittedResource(&heap,
-      D3D12_HEAP_FLAG_CREATE_NOT_ZEROED, &desc, state, nullptr,
+      flags, &desc, state, nullptr,
       IID_PPV_ARGS(&core->slots[i].res));
     if (FAILED(hr))
     {

idd/LGIdd/capture/CFrameTex.h

@@ -47,11 +47,12 @@ private:
   ComPtr<ID3D12Resource>  m_res;
   D12Sync                 m_sync;
   D3D12_RESOURCE_STATES   m_state;
+  bool                     m_shared;
 
   CFrameTex(uint64_t graph, uint64_t pool, unsigned node, unsigned slot,
     uint64_t version, const FrameProfile& profile, const FrameDesc& frame,
     const ComPtr<ID3D12Resource>& res, const D12Sync& sync,
-    D3D12_RESOURCE_STATES state);
+    D3D12_RESOURCE_STATES state, bool shared);
 
 public:
   CFrameTex(const CFrameTex&) = delete;
@@ -68,6 +69,7 @@ public:
   ID3D12Resource * Get() const { return m_res.Get(); }
   const D12Sync& Sync() const { return m_sync; }
   D3D12_RESOURCE_STATES State() const { return m_state; }
+  bool Shared() const { return m_shared; }
   bool Wait(CD3D12CommandSlot& cmd) const;
   D12SyncState Status() const { return m_sync.State(); }
   bool Ready() const { return m_sync.Done(); }
@@ -152,7 +154,7 @@ public:
 
   TexResult Init(ID3D12Device3 * device, uint64_t graph, unsigned node,
     const FrameProfile& profile, const D3D12_RESOURCE_DESC& desc,
-    D3D12_RESOURCE_STATES state, unsigned slots);
+    D3D12_RESOURCE_STATES state, unsigned slots, bool shared = false);
   void Reset();
   TexResult Try(TexWrite& write);
 };

idd/LGIdd/d3d/CD3D11Device.cpp

@@ -47,11 +47,13 @@ HRESULT CD3D11Device::Init()
 
   ComPtr<ID3D11Device> device;
   ComPtr<ID3D11DeviceContext> context;
+  const UINT flags = D3D11_CREATE_DEVICE_BGRA_SUPPORT |
+    (m_video ? D3D11_CREATE_DEVICE_VIDEO_SUPPORT : 0);
   hr = D3D11CreateDevice(
     m_adapter.Get(),
     D3D_DRIVER_TYPE_UNKNOWN,
     nullptr,
-    D3D11_CREATE_DEVICE_BGRA_SUPPORT,
+    flags,
     featureLevels,
     ARRAYSIZE(featureLevels),
     D3D11_SDK_VERSION,

idd/LGIdd/d3d/CD3D11Device.h

@@ -37,10 +37,13 @@ private:
   ComPtr<ID3D11Device5       > m_device;
   ComPtr<ID3D11DeviceContext4> m_context;
   bool                         m_isSoftware = false;
+  bool                         m_video      = false;
 
 public:
-  CD3D11Device(LUID adapterLuid) :
-    m_adapterLuid(adapterLuid) {};
+  CD3D11Device(LUID adapterLuid, bool video = false) :
+    m_adapterLuid(adapterLuid),
+    m_video(video)
+  {}
 
   CD3D11Device()
   {
@@ -53,5 +56,8 @@ public:
 
   ComPtr<ID3D11DeviceContext4> GetContext() { return m_context; }
 
+  LUID GetAdapterLuid() const { return m_adapterLuid; }
+
   bool IsSoftware() { return m_isSoftware; }
+  bool IsVideo() const { return m_video; }
 };

idd/LGIdd/d3d/CD3D12CommandQueue.cpp

@@ -432,7 +432,7 @@ bool CD3D12CommandQueue::InitTiming(ID3D12Device3 * device, UINT slotCount)
 bool CD3D12CommandQueue::Init(ID3D12Device3 * device,
   D3D12_COMMAND_LIST_TYPE type, const WCHAR * name,
   CD3D12CommandSlot::CallbackMode callbackMode, UINT slotCount,
-  bool enableTiming)
+  bool enableTiming, bool sharedFence)
 {
   if (!slotCount || slotCount > MAX_SLOTS)
   {
@@ -455,7 +455,9 @@ bool CD3D12CommandQueue::Init(ID3D12Device3 * device,
   }
   m_queue->SetName(name);
 
-  hr = device->CreateFence(0, D3D12_FENCE_FLAG_NONE,
+  const D3D12_FENCE_FLAGS fenceFlags = sharedFence ?
+    D3D12_FENCE_FLAG_SHARED : D3D12_FENCE_FLAG_NONE;
+  hr = device->CreateFence(0, fenceFlags,
     IID_PPV_ARGS(&m_fence));
   if (FAILED(hr))
   {

idd/LGIdd/d3d/CD3D12CommandQueue.h

@@ -198,7 +198,7 @@ class CD3D12CommandQueue
 
     bool Init(ID3D12Device3 * device, D3D12_COMMAND_LIST_TYPE type,
       const WCHAR * name, CD3D12CommandSlot::CallbackMode callbackMode,
-      UINT slotCount, bool enableTiming = false);
+      UINT slotCount, bool enableTiming = false, bool sharedFence = false);
     void DeInit();
 
     CD3D12CommandSlot * Acquire(UINT slotIndex);

idd/LGIdd/d3d/CD3D12Device.cpp

@@ -137,12 +137,12 @@ CD3D12Device::InitResult CD3D12Device::Init(
 
   if (!m_copyQueue.Init(m_device.Get(), D3D12_COMMAND_LIST_TYPE_COPY,
       L"Copy", m_indirectCopy ? CD3D12CommandSlot::NORMAL :
-                               CD3D12CommandSlot::FAST, 2, true))
+                               CD3D12CommandSlot::FAST, 2, true, true))
     return InitResult::FAILURE;
 
   if (m_computeEnabled &&
       !m_computeQueue.Init(m_device.Get(), D3D12_COMMAND_LIST_TYPE_COMPUTE,
-        L"Compute", CD3D12CommandSlot::FAST, 2))
+        L"Compute", CD3D12CommandSlot::FAST, 2, false, true))
     return InitResult::FAILURE;
 
   DEBUG_INFO("Created CD3D12Device");

idd/LGIdd/d3d/CD3D12Device.h

@@ -79,6 +79,7 @@ struct CD3D12Device
 
     ComPtr<ID3D12Device3> GetDevice() { return m_device; }
     ComPtr<ID3D12Heap   > GetTransportHeap() { return m_transportHeap; }
+    LUID GetAdapterLuid() const { return m_adapterLuid; }
     bool IsIndirectCopy() const { return m_indirectCopy; }
 
     CD3D12CommandSlot * GetCopySlot   ();

idd/LGIdd/d3d/CInteropPool.cpp

@@ -0,0 +1,407 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2026 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "d3d/CInteropPool.h"
+
+#include "CDebug.h"
+
+#include <new>
+
+using Microsoft::WRL::Wrappers::HandleT;
+using Microsoft::WRL::Wrappers::HandleTraits::HANDLENullTraits;
+
+static bool SameObject(IUnknown * left, IUnknown * right)
+{
+  if (!left || !right)
+    return false;
+  ComPtr<IUnknown> leftId;
+  ComPtr<IUnknown> rightId;
+  return
+    SUCCEEDED(left->QueryInterface(IID_PPV_ARGS(&leftId)))   &&
+    SUCCEEDED(right->QueryInterface(IID_PPV_ARGS(&rightId))) &&
+    leftId.Get() == rightId.Get();
+}
+
+static bool SameDesc(const D3D12_RESOURCE_DESC& d12,
+  const D3D11_TEXTURE2D_DESC& d11)
+{
+  return
+    d12.Dimension          == D3D12_RESOURCE_DIMENSION_TEXTURE2D &&
+    d12.Width              == d11.Width                          &&
+    d12.Height             == d11.Height                         &&
+    d12.DepthOrArraySize   == d11.ArraySize                      &&
+    d12.MipLevels          == d11.MipLevels                      &&
+    d12.Format             == d11.Format                         &&
+    d12.SampleDesc.Count   == d11.SampleDesc.Count               &&
+    d12.SampleDesc.Quality == d11.SampleDesc.Quality             &&
+    d11.Usage              == D3D11_USAGE_DEFAULT                &&
+    d11.CPUAccessFlags     == 0;
+}
+
+D12SyncState D11Sync::State() const
+{
+  if (ready)
+    return D12SyncState::READY;
+  if (!Valid())
+    return D12SyncState::FAILED;
+  const UINT64 completed = fence->GetCompletedValue();
+  if (completed == UINT64_MAX)
+    return D12SyncState::FAILED;
+  return completed >= value ?
+    D12SyncState::READY : D12SyncState::PENDING;
+}
+
+struct CD3D11Core
+{
+  static const unsigned MAX_FENCES = 4;
+
+  struct View
+  {
+    uint64_t                 pool = 0;
+    ComPtr<ID3D12Resource>   src;
+    ComPtr<ID3D11Texture2D>  tex;
+  };
+
+  struct Fence
+  {
+    ComPtr<ID3D12Fence> src;
+    ComPtr<ID3D11Fence> fence;
+  };
+
+  mutable CSRWLock              lock;
+  bool                          open   = true;
+  bool                          failed = false;
+  uint64_t                      pool   = 0;
+  UINT                          bind   = 0;
+  std::shared_ptr<CD3D11Device> d11;
+  std::shared_ptr<CD3D12Device> d12;
+  ComPtr<ID3D11Device5>         dev11;
+  ComPtr<ID3D12Device3>         dev12;
+  View                          views[CTexPool::MAX_SLOTS];
+  Fence                         fences[MAX_FENCES];
+
+  void Stop()
+  {
+    CSRWExclusiveLock guard(lock);
+    open = false;
+  }
+
+  void Fail()
+  {
+    CSRWExclusiveLock guard(lock);
+    failed = true;
+  }
+
+  TexResult Error(HRESULT hr)
+  {
+    const HRESULT removed   = dev12->GetDeviceRemovedReason();
+    const HRESULT removed11 = dev11->GetDeviceRemovedReason();
+    if (removed != S_OK || removed11 != S_OK || hr == E_OUTOFMEMORY)
+    {
+      const HRESULT reason = removed != S_OK ? removed :
+        (removed11 != S_OK ? removed11 : hr);
+      DEBUG_ERROR_HR(reason, "D3D11 texture interop failed");
+      failed = true;
+      return TexResult::FAILED;
+    }
+    DEBUG_WARN_HR(hr, "D3D11 texture interop is unavailable");
+    return TexResult::REJECTED;
+  }
+
+  TexResult OpenView(const CFrameTex& frame,
+    ComPtr<ID3D11Texture2D>& texture)
+  {
+    if (frame.slot >= CTexPool::MAX_SLOTS)
+      return TexResult::REJECTED;
+
+    View& view = views[frame.slot];
+    if (view.tex)
+    {
+      if (view.pool != frame.pool ||
+          !SameObject(view.src.Get(), frame.Get()))
+      {
+        failed = true;
+        return TexResult::FAILED;
+      }
+      texture = view.tex;
+      return TexResult::OK;
+    }
+
+    HANDLE raw = nullptr;
+    const HRESULT create = dev12->CreateSharedHandle(frame.Get(), nullptr,
+      GENERIC_ALL, nullptr, &raw);
+    if (FAILED(create))
+      return Error(create);
+    HandleT<HANDLENullTraits> handle;
+    handle.Attach(raw);
+
+    ComPtr<ID3D11Texture2D> opened;
+    const HRESULT hr = dev11->OpenSharedResource1(handle.Get(),
+      IID_PPV_ARGS(&opened));
+    handle.Close();
+    if (FAILED(hr))
+      return Error(hr);
+
+    D3D11_TEXTURE2D_DESC desc11 = {};
+    opened->GetDesc(&desc11);
+    if (!SameDesc(frame.Get()->GetDesc(), desc11) ||
+        (desc11.BindFlags & bind) != bind)
+      return TexResult::REJECTED;
+
+    view.pool  = frame.pool;
+    view.src   = frame.Get();
+    view.tex   = opened;
+    texture    = opened;
+    return TexResult::OK;
+  }
+
+  TexResult OpenFence(const D12Sync& sync, D11Sync& result)
+  {
+    ComPtr<ID3D12Device> owner;
+    if (!sync.Valid() ||
+        FAILED(sync.fence->GetDevice(IID_PPV_ARGS(&owner))) ||
+        !SameObject(owner.Get(), dev12.Get()))
+      return TexResult::REJECTED;
+
+    const D12SyncState state = sync.State();
+    if (state == D12SyncState::FAILED)
+    {
+      failed = true;
+      return TexResult::FAILED;
+    }
+    if (state == D12SyncState::READY)
+    {
+      result.ready = true;
+      return TexResult::OK;
+    }
+
+    for (unsigned i = 0; i < MAX_FENCES; ++i)
+      if (fences[i].fence &&
+          SameObject(fences[i].src.Get(), sync.fence.Get()))
+      {
+        result.fence = fences[i].fence;
+        result.value = sync.value;
+        return TexResult::OK;
+      }
+
+    unsigned free = MAX_FENCES;
+    for (unsigned i = 0; i < MAX_FENCES; ++i)
+      if (!fences[i].fence)
+      {
+        free = i;
+        break;
+      }
+    if (free == MAX_FENCES)
+      return TexResult::BUSY;
+
+    HANDLE raw = nullptr;
+    const HRESULT create = dev12->CreateSharedHandle(sync.fence.Get(),
+      nullptr, GENERIC_ALL, nullptr, &raw);
+    if (FAILED(create))
+      return Error(create);
+    HandleT<HANDLENullTraits> handle;
+    handle.Attach(raw);
+
+    ComPtr<ID3D11Fence> opened;
+    const HRESULT hr = dev11->OpenSharedFence(handle.Get(),
+      IID_PPV_ARGS(&opened));
+    handle.Close();
+    if (FAILED(hr))
+      return Error(hr);
+
+    fences[free].src   = sync.fence;
+    fences[free].fence = opened;
+    result.fence       = opened;
+    result.value       = sync.value;
+    return TexResult::OK;
+  }
+
+  TexResult Get(const TexLease& src, D11Lease& lease)
+  {
+    const CFrameTex * frame = src.Get();
+    if (!frame                                                       ||
+        frame->profile.storage != FrameStorage::D3D12_TEXTURE        ||
+        !frame->Shared()                                             ||
+        frame->State()          != D3D12_RESOURCE_STATE_COMMON       ||
+        !frame->Get()                                                ||
+        !frame->Sync().Valid())
+      return TexResult::REJECTED;
+
+    ComPtr<ID3D12Device> owner;
+    if (FAILED(frame->Get()->GetDevice(IID_PPV_ARGS(&owner))) ||
+        !SameObject(owner.Get(), dev12.Get()))
+      return TexResult::REJECTED;
+
+    CSRWExclusiveLock guard(lock);
+    if (!open || failed)
+      return TexResult::FAILED;
+    if (frame->Status() == D12SyncState::FAILED)
+    {
+      failed = true;
+      return TexResult::FAILED;
+    }
+    if (!pool)
+      pool = frame->pool;
+    else if (pool != frame->pool)
+      return TexResult::REJECTED;
+
+    ComPtr<ID3D11Texture2D> texture;
+    TexResult result = OpenView(*frame, texture);
+    if (result != TexResult::OK)
+      return result;
+
+    D11Sync sync;
+    result = OpenFence(frame->Sync(), sync);
+    if (result != TexResult::OK)
+      return result;
+
+    const FrameProfile profile =
+      Frame::Store(frame->profile, FrameStorage::D3D11_TEXTURE);
+    lease = D11Lease(shared_from_this(), src, texture, sync, profile);
+    return TexResult::OK;
+  }
+
+private:
+  // Filled by Init after construction; avoids exposing ownership callbacks
+  // from cached COM objects.
+  std::weak_ptr<CD3D11Core> self;
+
+  std::shared_ptr<CD3D11Core> shared_from_this()
+  {
+    return self.lock();
+  }
+
+  friend class CInteropPool;
+};
+
+D11Lease::D11Lease(const std::shared_ptr<CD3D11Core>& core,
+  const TexLease& src, const ComPtr<ID3D11Texture2D>& tex,
+  const D11Sync& sync, const FrameProfile& profile) :
+  m_core(core),
+  m_src(src),
+  m_tex(tex),
+  m_sync(sync),
+  m_profile(profile)
+{
+}
+
+TexResult D11Lease::Wait(ID3D11DeviceContext4 * context) const
+{
+  if (!m_core || !m_src || !m_tex || !context || !m_sync.Valid())
+    return TexResult::REJECTED;
+
+  ComPtr<ID3D11Device> owner;
+  context->GetDevice(owner.GetAddressOf());
+  if (!SameObject(owner.Get(), m_core->dev11.Get()))
+    return TexResult::REJECTED;
+
+  const D12SyncState state = m_sync.State();
+  if (state == D12SyncState::FAILED)
+  {
+    m_core->Fail();
+    return TexResult::FAILED;
+  }
+  if (state == D12SyncState::READY)
+    return TexResult::OK;
+
+  const HRESULT hr = context->Wait(m_sync.fence.Get(), m_sync.value);
+  if (FAILED(hr))
+  {
+    DEBUG_ERROR_HR(hr, "Failed to queue the D3D11 producer wait");
+    m_core->Fail();
+    return TexResult::FAILED;
+  }
+  return TexResult::OK;
+}
+
+void D11Lease::Reset()
+{
+  m_sync = D11Sync {};
+  m_tex.Reset();
+  m_src.Reset();
+  m_core.reset();
+  m_profile = FrameProfile {};
+}
+
+TexResult CInteropPool::Init(
+  const std::shared_ptr<CD3D11Device>& d11,
+  const std::shared_ptr<CD3D12Device>& d12, UINT bind)
+{
+  if (!d11 || !d12 || !Frame::Same(d11->GetAdapterLuid(),
+      d12->GetAdapterLuid()))
+    return TexResult::REJECTED;
+
+  ComPtr<ID3D11Device5> dev11 = d11->GetDevice();
+  ComPtr<ID3D12Device3> dev12 = d12->GetDevice();
+  if (!dev11 || !dev12)
+    return TexResult::REJECTED;
+
+  std::shared_ptr<CD3D11Core> core;
+  try
+  {
+    core = std::shared_ptr<CD3D11Core>(new (std::nothrow) CD3D11Core);
+  }
+  catch (const std::bad_alloc&)
+  {
+    return TexResult::FAILED;
+  }
+  if (!core)
+    return TexResult::FAILED;
+  core->d11   = d11;
+  core->d12   = d12;
+  core->dev11 = dev11;
+  core->dev12 = dev12;
+  core->bind  = bind;
+  core->self  = core;
+
+  std::shared_ptr<CD3D11Core> old;
+  {
+    CSRWExclusiveLock guard(m_lock);
+    old = std::move(m_core);
+    if (old)
+      old->Stop();
+    m_core = core;
+  }
+  return TexResult::OK;
+}
+
+TexResult CInteropPool::Get(const TexLease& src, D11Lease& lease)
+{
+  if (lease)
+    return TexResult::REJECTED;
+
+  std::shared_ptr<CD3D11Core> core;
+  {
+    CSRWSharedLock guard(m_lock);
+    core = m_core;
+  }
+  return core ? core->Get(src, lease) : TexResult::FAILED;
+}
+
+void CInteropPool::Reset()
+{
+  std::shared_ptr<CD3D11Core> core;
+  {
+    CSRWExclusiveLock guard(m_lock);
+    core = std::move(m_core);
+    if (core)
+      core->Stop();
+  }
+}

idd/LGIdd/d3d/CInteropPool.h

@@ -0,0 +1,102 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2026 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#pragma once
+
+#include "CSRWLock.h"
+#include "capture/CFrameTex.h"
+#include "d3d/CD3D11Device.h"
+#include "d3d/CD3D12Device.h"
+
+#include <memory>
+
+struct CD3D11Core;
+
+struct D11Sync
+{
+  ComPtr<ID3D11Fence> fence;
+  UINT64              value = 0;
+  bool                ready = false;
+
+  bool Valid() const { return ready || (fence && value); }
+  D12SyncState State() const;
+};
+
+// A native D3D11 view of one immutable graph product. Keep the lease until
+// the encoder's GPU completion, not merely until its submission returns.
+class D11Lease
+{
+  friend class CInteropPool;
+  friend struct CD3D11Core;
+
+private:
+  std::shared_ptr<CD3D11Core> m_core;
+  TexLease                    m_src;
+  ComPtr<ID3D11Texture2D>     m_tex;
+  D11Sync                     m_sync;
+  FrameProfile                m_profile;
+
+  D11Lease(const std::shared_ptr<CD3D11Core>& core, const TexLease& src,
+    const ComPtr<ID3D11Texture2D>& tex, const D11Sync& sync,
+    const FrameProfile& profile);
+
+public:
+  D11Lease() = default;
+  D11Lease(const D11Lease&) = default;
+  D11Lease& operator=(const D11Lease&) = default;
+  D11Lease(D11Lease&&) noexcept = default;
+  D11Lease& operator=(D11Lease&&) noexcept = default;
+
+  explicit operator bool() const { return !!m_src && !!m_tex; }
+  ID3D11Texture2D * Get() const { return m_tex.Get(); }
+  const CFrameTex * Frame() const { return m_src.Get(); }
+  const FrameProfile& Profile() const { return m_profile; }
+  const D11Sync& Sync() const { return m_sync; }
+  D12SyncState Status() const { return m_sync.State(); }
+
+  // Orders only work subsequently submitted through this exact context.
+  // The context owner remains responsible for its thread serialization and
+  // for ordering any private encoder queue.
+  TexResult Wait(ID3D11DeviceContext4 * context) const;
+  void Reset();
+};
+
+// Opens cached native D3D11 views of shareable D3D12 graph products. The
+// pool never copies, transitions, or writes a product. Failures remain local
+// to this interop route and cannot invalidate the source or sibling routes.
+class CInteropPool
+{
+private:
+  mutable CSRWLock            m_lock;
+  std::shared_ptr<CD3D11Core> m_core;
+
+public:
+  CInteropPool() = default;
+  CInteropPool(const CInteropPool&) = delete;
+  CInteropPool& operator=(const CInteropPool&) = delete;
+  ~CInteropPool() { Reset(); }
+
+  // bind is the minimum native D3D11 bind capability required by the future
+  // consumer. Unsupported capabilities reject this route without a copy.
+  TexResult Init(const std::shared_ptr<CD3D11Device>& d11,
+    const std::shared_ptr<CD3D12Device>& d12, UINT bind = 0);
+  TexResult Get(const TexLease& src, D11Lease& lease);
+  void Reset();
+};