From f1f281b318dc562d5741b55ff25198f3f1602312 Mon Sep 17 00:00:00 2001
From: Loïc Guilloux <glx22@users.noreply.github.com>
Date: Tue, 9 Feb 2021 21:21:57 +0100
Subject: Fix: [Win32] Set minimum resolution for timers to 1ms. (#8660)

---
 src/os/windows/crashlog_win.cpp | 4 ++++
 src/os/windows/win32.cpp        | 8 ++++++++
 2 files changed, 12 insertions(+)

(limited to 'src/os')

diff --git a/src/os/windows/crashlog_win.cpp b/src/os/windows/crashlog_win.cpp
index 872e472d5..b5916dd26 100644
--- a/src/os/windows/crashlog_win.cpp
+++ b/src/os/windows/crashlog_win.cpp
@@ -21,6 +21,7 @@
 
 #include <windows.h>
 #include <signal.h>
+#include <timeapi.h>
 
 #include "../../safeguards.h"
 
@@ -540,6 +541,9 @@ void *_safe_esp = nullptr;
 
 static LONG WINAPI ExceptionHandler(EXCEPTION_POINTERS *ep)
 {
+	/* Restore system timer resolution. */
+	timeEndPeriod(1);
+
 	/* Disable our event loop. */
 	SetWindowLongPtr(GetActiveWindow(), GWLP_WNDPROC, (LONG_PTR)&DefWindowProc);
 
diff --git a/src/os/windows/win32.cpp b/src/os/windows/win32.cpp
index 6576ea20d..8783b3762 100644
--- a/src/os/windows/win32.cpp
+++ b/src/os/windows/win32.cpp
@@ -18,6 +18,7 @@
 #define NO_SHOBJIDL_SORTDIRECTION // Avoid multiple definition of SORT_ASCENDING
 #include <shlobj.h> /* SHGetFolderPath */
 #include <shellapi.h>
+#include <timeapi.h>
 #include "win32.h"
 #include "../../fios.h"
 #include "../../core/alloc_func.hpp"
@@ -413,6 +414,9 @@ int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLi
 	int argc;
 	char *argv[64]; // max 64 command line arguments
 
+	/* Set system timer resolution to 1ms. */
+	timeBeginPeriod(1);
+
 	CrashLog::InitialiseCrashLog();
 
 #if defined(UNICODE)
@@ -440,6 +444,10 @@ int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLi
 	for (int i = 0; i < argc; i++) ValidateString(argv[i]);
 
 	openttd_main(argc, argv);
+
+	/* Restore system timer resolution. */
+	timeEndPeriod(1);
+
 	free(cmdline);
 	return 0;
 }
-- 
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