From 3de4924a09519fa70b668eae36bd9c23bb389144 Mon Sep 17 00:00:00 2001
From: lizzie <lizzie@eden-emu.dev>
Date: Thu, 27 Nov 2025 07:00:04 +0000
Subject: [PATCH] windows 7 stuffs

---
 src/common/steady_clock.cpp             | 24 +++++++++++++++---------
 src/common/thread.cpp                   |  3 ++-
 src/common/windows/timer_resolution.cpp | 17 +++++++++++------
 3 files changed, 28 insertions(+), 16 deletions(-)

diff --git a/src/common/steady_clock.cpp b/src/common/steady_clock.cpp
index 9415eed29b..f142000688 100644
--- a/src/common/steady_clock.cpp
+++ b/src/common/steady_clock.cpp
@@ -25,15 +25,21 @@ static s64 WindowsQueryPerformanceCounter() {
 }
 
 static s64 GetSystemTimeNS() {
-    // GetSystemTimePreciseAsFileTime returns the file time in 100ns units.
-    static constexpr s64 Multiplier = 100;
-    // Convert Windows epoch to Unix epoch.
-    static constexpr s64 WindowsEpochToUnixEpoch = 0x19DB1DED53E8000LL;
-
-    FILETIME filetime;
-    GetSystemTimePreciseAsFileTime(&filetime);
-    return Multiplier * ((static_cast<s64>(filetime.dwHighDateTime) << 32) +
-                         static_cast<s64>(filetime.dwLowDateTime) - WindowsEpochToUnixEpoch);
+    static auto pf = (decltype(&GetSystemTimePreciseAsFileTime))(void*)GetProcAddress(GetModuleHandle(TEXT("Kernel32.dll")), "GetSystemTimePreciseAsFileTime"); // Windows 8+
+    if (pf) {
+        // GetSystemTimePreciseAsFileTime returns the file time in 100ns units.
+        constexpr s64 Multiplier = 100;
+        // Convert Windows epoch to Unix epoch.
+        constexpr s64 WindowsEpochToUnixEpoch = 0x19DB1DED53E8000LL;
+        FILETIME filetime;
+        GetSystemTimePreciseAsFileTime(&filetime);
+        return Multiplier * ((s64(filetime.dwHighDateTime) << 32) + s64(filetime.dwLowDateTime) - WindowsEpochToUnixEpoch);
+    } else {
+        // Only Windows XP and below error out here
+        LARGE_INTEGER ticks;
+        QueryPerformanceCounter(&ticks);
+        return ticks.QuadPart;
+    }
 }
 #endif
 
diff --git a/src/common/thread.cpp b/src/common/thread.cpp
index cc78587c36..482848b244 100644
--- a/src/common/thread.cpp
+++ b/src/common/thread.cpp
@@ -81,7 +81,8 @@ void SetCurrentThreadPriority(ThreadPriority new_priority) {
 
 // Sets the debugger-visible name of the current thread.
 void SetCurrentThreadName(const char* name) {
-    if (auto pf = (decltype(&SetThreadDescription))(void*)GetProcAddress(GetModuleHandle(TEXT("KernelBase.dll")), "SetThreadDescription"); pf)
+    static auto pf = (decltype(&SetThreadDescription))(void*)GetProcAddress(GetModuleHandle(TEXT("KernelBase.dll")), "SetThreadDescription");
+    if (pf)
         pf(GetCurrentThread(), UTF8ToUTF16W(name).data()); // Windows 10+
 }
 
diff --git a/src/common/windows/timer_resolution.cpp b/src/common/windows/timer_resolution.cpp
index bf29823455..b742c32bd4 100644
--- a/src/common/windows/timer_resolution.cpp
+++ b/src/common/windows/timer_resolution.cpp
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -62,13 +65,15 @@ TimerResolution GetTimerResolution() {
 
 void SetHighQoS() {
     // https://learn.microsoft.com/en-us/windows/win32/procthread/quality-of-service
-    PROCESS_POWER_THROTTLING_STATE PowerThrottling{
-        .Version = PROCESS_POWER_THROTTLING_CURRENT_VERSION,
-        .ControlMask = PROCESS_POWER_THROTTLING_EXECUTION_SPEED | PROCESS_POWER_THROTTLING_IGNORE_TIMER_RESOLUTION,
-        .StateMask = 0,
-    };
-    if (auto pf = (decltype(&SetProcessInformation))(void*)GetProcAddress(GetModuleHandle(TEXT("Kernel32.dll")), "SetProcessInformation"); pf)
+    static auto auto pf = (decltype(&SetProcessInformation))(void*)GetProcAddress(GetModuleHandle(TEXT("Kernel32.dll")), "SetProcessInformation");
+    if (pf) {
+        PROCESS_POWER_THROTTLING_STATE PowerThrottling{
+            .Version = PROCESS_POWER_THROTTLING_CURRENT_VERSION,
+            .ControlMask = PROCESS_POWER_THROTTLING_EXECUTION_SPEED | PROCESS_POWER_THROTTLING_IGNORE_TIMER_RESOLUTION,
+            .StateMask = 0,
+        };
         pf(GetCurrentProcess(), ProcessPowerThrottling, &PowerThrottling, sizeof(PROCESS_POWER_THROTTLING_STATE)); // Windows 7+
+    }
 }
 
 } // Anonymous namespace