[idd] helper: detect if system has GPU

2026-06-05 06:14:25 +00:00 · 2026-06-03 00:27:29 -04:00
parent 3ef8344e9f
commit 1a137f3c08
5 changed files with 162 additions and 0 deletions
--- a/idd/LGIddHelper/Devices.cpp
+++ b/idd/LGIddHelper/Devices.cpp
@@ -0,0 +1,106 @@
+/**
+ * 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 "Devices.h"
+#include <windows.h>
+#include <devguid.h>
+#include <setupapi.h>
+#include <CDebug.h>
+
+inline static bool wprefix(const wchar_t *pre, const wchar_t *str)
+{
+  return wcsncmp(pre, str, wcslen(pre)) == 0;
+}
+
+bool checkGPU(bool &found)
+{
+  found = false;
+
+  HDEVINFO hDevInfo = SetupDiGetClassDevsW(&GUID_DEVCLASS_DISPLAY, NULL, NULL, DIGCF_PRESENT);
+  if (hDevInfo == INVALID_HANDLE_VALUE)
+  {
+    DEBUG_WARN_HR(GetLastError(), L"SetupDiGetClassDevsW");
+    return false;
+  }
+
+  SP_DEVINFO_DATA devInfo = { 0 };
+  devInfo.cbSize = sizeof devInfo;
+
+  for (DWORD dwIndex = 0; SetupDiEnumDeviceInfo(hDevInfo, dwIndex, &devInfo); ++dwIndex)
+  {
+    DWORD dwSizeRequired;
+    DWORD dwPropertyType;
+    SetupDiGetDeviceRegistryPropertyW(hDevInfo, &devInfo, SPDRP_HARDWAREID, &dwPropertyType, NULL, 0, &dwSizeRequired);
+
+    DWORD dwLastError = GetLastError();
+    if (dwLastError == ERROR_INVALID_DATA)
+      continue;
+    else if (dwLastError != ERROR_INSUFFICIENT_BUFFER)
+    {
+      DEBUG_WARN_HR(GetLastError(), L"SetupDiGetDeviceRegistryPropertyW(SPDRP_HARDWAREID) size calculation");
+      goto fail;
+    }
+
+    if (dwPropertyType != REG_MULTI_SZ)
+    {
+      DEBUG_WARN(L"SetupDiGetDeviceRegistryPropertyW(SPDRP_HARDWAREID) returned wrong type");
+      goto fail;
+    }
+
+    LPWSTR lpBuffer = (LPWSTR)malloc(dwSizeRequired);
+    if (!lpBuffer)
+    {
+      DEBUG_WARN(L"failed to allocate memory for SetupDiGetDeviceRegistryPropertyW(SPDRP_HARDWAREID)");
+      goto fail;
+    }
+
+    if (!SetupDiGetDeviceRegistryPropertyW(hDevInfo, &devInfo, SPDRP_HARDWAREID, &dwPropertyType, (PBYTE)lpBuffer, dwSizeRequired, NULL))
+    {
+      DEBUG_WARN_HR(GetLastError(), L"SetupDiGetDeviceRegistryPropertyW(SPDRP_HARDWAREID) for real");
+      free(lpBuffer);
+      goto fail;
+    }
+
+    for (LPWSTR lpHwId = lpBuffer; *lpHwId; lpHwId += wcslen(lpBuffer) + 1)
+    {
+      if (
+        wprefix(L"PCI\\VEN_10DE&", lpHwId) || // Nvidia
+        wprefix(L"PCI\\VEN_1002&", lpHwId) || // AMD
+        wprefix(L"PCI\\VEN_8086&", lpHwId)    // Intel
+      )
+      {
+        found = true;
+        break;
+      }
+    }
+
+    free(lpBuffer);
+
+    if (found)
+      break;
+  }
+
+  SetupDiDestroyDeviceInfoList(hDevInfo);
+  return true;
+
+fail:
+  SetupDiDestroyDeviceInfoList(hDevInfo);
+  return false;
+}