✨ Add active runtime to reports

Author: fredemmott

src/CMakeLists.txt

@@ -36,6 +36,8 @@ add_library(
   std23/ranges.hpp
   ConstexprString.hpp
   StringTemplateParameter.hpp
+  GetActiveRuntimePath.hpp
+  windows/GetActiveRuntimePath.cpp
 )
 
 # Using an OBJECT library instead of `STATIC`, because otherwise
@@ -105,6 +107,7 @@ if(WIN32)
     lib
     PRIVATE
     windows/CheckForUpdates.cpp
+    windows/GetActiveRuntimePath.cpp
   )
 
   target_sources(

src/GetActiveRuntimePath.hpp

@@ -0,0 +1,16 @@
+// Copyright 2023 Fred Emmott <[email protected]>
+// SPDX-License-Identifier: ISC
+
+#pragma once
+
+#include <filesystem>
+
+namespace FredEmmott::OpenXRLayers {
+
+/** Return the path of the active runtime.
+ *
+ * Will return an empty path if the active runtime can not be determined.
+ */
+std::filesystem::path GetActiveRuntimePath();
+
+}// namespace FredEmmott::OpenXRLayers

src/SaveReport.cpp

@@ -12,6 +12,7 @@
 
 #include "APILayerStore.hpp"
 #include "Config.hpp"
+#include "GetActiveRuntimePath.hpp"
 #include "Linter.hpp"
 
 namespace FredEmmott::OpenXRLayers {
@@ -121,6 +122,14 @@ void SaveReport(const std::filesystem::path& path) {
     std::chrono::zoned_time(
       std::chrono::current_zone(), std::chrono::system_clock::now()));
 
+  const auto runtime = GetActiveRuntimePath();
+  if (runtime.empty()) {
+    text
+      += std::format("\n\n{} NO ACTIVE RUNTIME FOUND\n", Config::GLYPH_ERROR);
+  } else {
+    text += std::format("\n\nActive runtime: {}\n", runtime.string());
+  }
+
   for (const auto store: APILayerStore::Get()) {
     text += GenerateReportText(store);
   }

src/windows/GetActiveRuntimePath.cpp

@@ -0,0 +1,42 @@
+// Copyright 2023 Fred Emmott <[email protected]>
+
+#include "../GetActiveRuntimePath.hpp"
+
+#include <Windows.h>
+
+#include <assert.h>
+
+namespace FredEmmott::OpenXRLayers {
+
+static LSTATUS GetActiveRuntimePath(void* data, DWORD* dataSize) {
+  return RegGetValueW(
+    HKEY_LOCAL_MACHINE,
+    L"SOFTWARE\\Khronos\\OpenXR\\1",
+    L"ActiveRuntime",
+    RRF_RT_REG_SZ,
+    nullptr,
+    data,
+    dataSize);
+}
+
+std::filesystem::path GetActiveRuntimePath() {
+  DWORD dataSize {0};
+  if (GetActiveRuntimePath(nullptr, &dataSize) != ERROR_SUCCESS) {
+    return {};
+  }
+  if (dataSize == 0) {
+    return {};
+  }
+  assert(dataSize % sizeof(wchar_t) == 0);
+
+  std::wstring ret;
+  ret.resize(dataSize / sizeof(WCHAR));
+  GetActiveRuntimePath(ret.data(), &dataSize);
+  while (ret.back() == L'\0') {
+    ret.pop_back();
+  }
+
+  return ret;
+}
+
+}// namespace FredEmmott::OpenXRLayers