From 803aea0d21a329659ea83f5f3767d5b36bfb42f9 Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Wed, 3 Jun 2026 17:48:32 +1000
Subject: [PATCH] [idd] ipc: implement reporting of GPU software status

---
 idd/LGCommon/PipeMsg.h                |  9 ++++++++-
 idd/LGIdd/CD3D11Device.cpp            |  7 +++++++
 idd/LGIdd/CD3D11Device.h              |  3 +++
 idd/LGIdd/CIndirectMonitorContext.cpp |  2 ++
 idd/LGIdd/CPipeServer.cpp             | 12 ++++++++++++
 idd/LGIdd/CPipeServer.h               |  1 +
 idd/LGIddHelper/CPipeClient.cpp       |  9 +++++++++
 idd/LGIddHelper/CPipeClient.h         |  1 +
 8 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/idd/LGCommon/PipeMsg.h b/idd/LGCommon/PipeMsg.h
index cf74d6fe..99595c40 100644
--- a/idd/LGCommon/PipeMsg.h
+++ b/idd/LGCommon/PipeMsg.h
@@ -30,7 +30,8 @@ struct LGPipeMsg
   enum
   {
     SETCURSORPOS,
-    SETDISPLAYMODE
+    SETDISPLAYMODE,
+    GPUSTATUS
   }
   type;
   union
@@ -49,5 +50,11 @@ struct LGPipeMsg
       uint32_t refresh;
     }
     displayMode;
+
+    struct
+    {
+      bool software;
+    }
+    gpuStatus;
   };
 };
\ No newline at end of file
diff --git a/idd/LGIdd/CD3D11Device.cpp b/idd/LGIdd/CD3D11Device.cpp
index 33fb26aa..a179845f 100644
--- a/idd/LGIdd/CD3D11Device.cpp
+++ b/idd/LGIdd/CD3D11Device.cpp
@@ -30,6 +30,13 @@ HRESULT CD3D11Device::Init()
   hr = m_factory->EnumAdapterByLuid(m_adapterLuid, IID_PPV_ARGS(&m_adapter));
   if (FAILED(hr))
     return hr;
+
+  DXGI_ADAPTER_DESC1 desc = {};
+  hr = m_adapter->GetDesc1(&desc);
+  if (FAILED(hr))
+    return hr;
+
+  m_isSoftware = (desc.Flags & DXGI_ADAPTER_FLAG_SOFTWARE) != 0;
   
   // only 11.1 supports DX12 interoperabillity
   static const D3D_FEATURE_LEVEL featureLevels[] =
diff --git a/idd/LGIdd/CD3D11Device.h b/idd/LGIdd/CD3D11Device.h
index 7a275c6c..e8020f4f 100644
--- a/idd/LGIdd/CD3D11Device.h
+++ b/idd/LGIdd/CD3D11Device.h
@@ -36,6 +36,7 @@ private:
   ComPtr<IDXGIAdapter1       > m_adapter;
   ComPtr<ID3D11Device5       > m_device;
   ComPtr<ID3D11DeviceContext4> m_context;
+  bool m_isSoftware;
 
 public:
   CD3D11Device(LUID adapterLuid) :
@@ -51,4 +52,6 @@ public:
   ComPtr<ID3D11Device5> GetDevice() { return m_device; }
 
   ComPtr<ID3D11DeviceContext4> GetContext() { return m_context; }
+
+  bool IsSoftware() { return m_isSoftware; }
 };
\ No newline at end of file
diff --git a/idd/LGIdd/CIndirectMonitorContext.cpp b/idd/LGIdd/CIndirectMonitorContext.cpp
index 864e828c..785f7bec 100644
--- a/idd/LGIdd/CIndirectMonitorContext.cpp
+++ b/idd/LGIdd/CIndirectMonitorContext.cpp
@@ -21,6 +21,7 @@
 #include "CIndirectMonitorContext.h"
 #include "CPlatformInfo.h"
 #include "CDebug.h"
+#include "CPipeServer.h"
 
 CIndirectMonitorContext::CIndirectMonitorContext(_In_ IDDCX_MONITOR monitor, CIndirectDeviceContext * device) :
   m_monitor(monitor),
@@ -70,6 +71,7 @@ reInit:
   }
 
   m_swapChain.reset(new CSwapChainProcessor(m_monitor, m_devContext, swapChain, m_dx11Device, m_dx12Device, newFrameEvent));
+  g_pipe.SetGPUStatus(m_dx11Device->IsSoftware());
 }
 
 void CIndirectMonitorContext::UnassignSwapChain()
diff --git a/idd/LGIdd/CPipeServer.cpp b/idd/LGIdd/CPipeServer.cpp
index e71ad500..99e1e921 100644
--- a/idd/LGIdd/CPipeServer.cpp
+++ b/idd/LGIdd/CPipeServer.cpp
@@ -174,4 +174,16 @@ void CPipeServer::SetDisplayMode(uint32_t width, uint32_t height, uint32_t refre
   msg.displayMode.height  = height;
   msg.displayMode.refresh = refresh;
   WriteMsg(msg);
+}
+
+void CPipeServer::SetGPUStatus(bool software)
+{
+  if (!m_connected)
+    return;
+
+  LGPipeMsg msg;
+  msg.size               = sizeof(msg);
+  msg.type               = LGPipeMsg::GPUSTATUS;
+  msg.gpuStatus.software = software;
+  WriteMsg(msg);
 }
\ No newline at end of file
diff --git a/idd/LGIdd/CPipeServer.h b/idd/LGIdd/CPipeServer.h
index f2fe5a63..5a8d320a 100644
--- a/idd/LGIdd/CPipeServer.h
+++ b/idd/LGIdd/CPipeServer.h
@@ -55,6 +55,7 @@ class CPipeServer
 
     void SetCursorPos(uint32_t x, uint32_t y);
     void SetDisplayMode(uint32_t width, uint32_t height, uint32_t refresh);
+    void SetGPUStatus(bool software);
 };
 
 extern CPipeServer g_pipe;
\ No newline at end of file
diff --git a/idd/LGIddHelper/CPipeClient.cpp b/idd/LGIddHelper/CPipeClient.cpp
index 2108f029..4a2aa8c6 100644
--- a/idd/LGIddHelper/CPipeClient.cpp
+++ b/idd/LGIddHelper/CPipeClient.cpp
@@ -264,6 +264,10 @@ void CPipeClient::Thread()
           HandleSetDisplayMode(msg);
           break;
 
+        case LGPipeMsg::GPUSTATUS:
+          HandleGPUStatus(msg);
+          break;
+
         default:
           DEBUG_ERROR("Unknown message type %d", msg.type);
           break;
@@ -300,3 +304,8 @@ void CPipeClient::HandleSetDisplayMode(const LGPipeMsg& msg)
   if (result != DISP_CHANGE_SUCCESSFUL)
     DEBUG_ERROR("ChangeDisplaySettingsEx Failed (0x%08x)", result);
 }
+
+void CPipeClient::HandleGPUStatus(const LGPipeMsg& msg)
+{
+  // TODO: implement me
+}
diff --git a/idd/LGIddHelper/CPipeClient.h b/idd/LGIddHelper/CPipeClient.h
index 33f72872..c6e53552 100644
--- a/idd/LGIddHelper/CPipeClient.h
+++ b/idd/LGIddHelper/CPipeClient.h
@@ -49,6 +49,7 @@ private:
   
   void HandleSetCursorPos(const LGPipeMsg& msg);
   void HandleSetDisplayMode(const LGPipeMsg& msg);
+  void HandleGPUStatus(const LGPipeMsg& msg);
 
 public:
   ~CPipeClient() { DeInit(); }