9 files changed, 84 insertions, 0 deletions
diff --git a/src/video/allegro_v.cpp b/src/video/allegro_v.cpp
index 0c064873b..3d8ca65aa 100644
--- a/src/video/allegro_v.cpp
+++ b/src/video/allegro_v.cpp
@@ -236,6 +236,16 @@ bool VideoDriver_Allegro::ClaimMousePointer()
 	return true;
 }
 
+std::vector<int> VideoDriver_Allegro::GetListOfMonitorRefreshRates()
+{
+	std::vector<int> rates = {};
+
+	int refresh_rate = get_refresh_rate();
+	if (refresh_rate != 0) rates.push_back(refresh_rate);
+
+	return rates;
+}
+
 struct AllegroVkMapping {
 	uint16 vk_from;
 	byte vk_count;
diff --git a/src/video/allegro_v.h b/src/video/allegro_v.h
index d67778b7f..d1576fea9 100644
--- a/src/video/allegro_v.h
+++ b/src/video/allegro_v.h
@@ -31,6 +31,8 @@ public:
 
 	bool ClaimMousePointer() override;
 
+	std::vector<int> GetListOfMonitorRefreshRates() override;
+
 	const char *GetName() const override { return "allegro"; }
 
 protected:
diff --git a/src/video/cocoa/cocoa_v.h b/src/video/cocoa/cocoa_v.h
index 371e4b5bc..3d3db5454 100644
--- a/src/video/cocoa/cocoa_v.h
+++ b/src/video/cocoa/cocoa_v.h
@@ -47,6 +47,8 @@ public:
 
 	void EditBoxLostFocus() override;
 
+	std::vector<int> GetListOfMonitorRefreshRates() override;
+
 	/* --- The following methods should be private, but can't be due to Obj-C limitations. --- */
 
 	void MainLoopReal();
diff --git a/src/video/cocoa/cocoa_v.mm b/src/video/cocoa/cocoa_v.mm
index 8d1fd4447..9fb74cd04 100644
--- a/src/video/cocoa/cocoa_v.mm
+++ b/src/video/cocoa/cocoa_v.mm
@@ -43,6 +43,7 @@
 
 #import <sys/param.h> /* for MAXPATHLEN */
 #import <sys/time.h> /* gettimeofday */
+#include <array>
 
 /**
  * Important notice regarding all modifications!!!!!!!
@@ -229,6 +230,30 @@ void VideoDriver_Cocoa::EditBoxLostFocus()
 }
 
 /**
+ * Get refresh rates of all connected monitors.
+ */
+std::vector<int> VideoDriver_Cocoa::GetListOfMonitorRefreshRates()
+{
+	std::vector<int> rates{};
+
+	if (MacOSVersionIsAtLeast(10, 6, 0)) {
+		std::array<CGDirectDisplayID, 16> displays;
+
+		uint32_t count = 0;
+		CGGetActiveDisplayList(displays.size(), displays.data(), &count);
+
+		for (uint32_t i = 0; i < count; i++) {
+			CGDisplayModeRef mode = CGDisplayCopyDisplayMode(displays[i]);
+			int rate = (int)CGDisplayModeGetRefreshRate(mode);
+			if (rate > 0) rates.push_back(rate);
+			CGDisplayModeRelease(mode);
+		}
+	}
+
+	return rates;
+}
+
+/**
  * Get the resolution of the main screen.
  */
 Dimension VideoDriver_Cocoa::GetScreenSize() const
diff --git a/src/video/sdl2_v.cpp b/src/video/sdl2_v.cpp
index 62675280c..2d8558534 100644
--- a/src/video/sdl2_v.cpp
+++ b/src/video/sdl2_v.cpp
@@ -237,6 +237,17 @@ void VideoDriver_SDL_Base::EditBoxLostFocus()
 	}
 }
 
+std::vector<int> VideoDriver_SDL_Base::GetListOfMonitorRefreshRates()
+{
+	std::vector<int> rates = {};
+	for (int i = 0; i < SDL_GetNumVideoDisplays(); i++) {
+		SDL_DisplayMode mode = {};
+		if (SDL_GetDisplayMode(i, 0, &mode) != 0) continue;
+		if (mode.refresh_rate != 0) rates.push_back(mode.refresh_rate);
+	}
+	return rates;
+}
+
 
 struct SDLVkMapping {
 	SDL_Keycode vk_from;
diff --git a/src/video/sdl2_v.h b/src/video/sdl2_v.h
index b1a64dd9c..bd43f71f8 100644
--- a/src/video/sdl2_v.h
+++ b/src/video/sdl2_v.h
@@ -39,6 +39,8 @@ public:
 
 	void EditBoxLostFocus() override;
 
+	std::vector<int> GetListOfMonitorRefreshRates() override;
+
 	const char *GetName() const override { return "sdl"; }
 
 protected:
diff --git a/src/video/video_driver.hpp b/src/video/video_driver.hpp
index 4b2de253a..8c2b9d437 100644
--- a/src/video/video_driver.hpp
+++ b/src/video/video_driver.hpp
@@ -150,6 +150,15 @@ public:
 	virtual void EditBoxGainedFocus() {}
 
 	/**
+	 * Get a list of refresh rates of each available monitor.
+	 * @return A vector of the refresh rates of all available monitors.
+	 */
+	virtual std::vector<int> GetListOfMonitorRefreshRates()
+	{
+		return {};
+	}
+
+	/**
 	 * Get a suggested default GUI zoom taking screen DPI into account.
 	 */
 	virtual ZoomLevel GetSuggestedUIZoom()
diff --git a/src/video/win32_v.cpp b/src/video/win32_v.cpp
index 8030380ce..a802cdafa 100644
--- a/src/video/win32_v.cpp
+++ b/src/video/win32_v.cpp
@@ -916,6 +916,27 @@ void VideoDriver_Win32Base::EditBoxLostFocus()
 	SetCandidatePos(this->main_wnd);
 }
 
+std::vector<int> VideoDriver_Win32Base::GetListOfMonitorRefreshRates()
+{
+	std::vector<int> rates = {};
+	EnumDisplayMonitors(nullptr, nullptr, [](HMONITOR hMonitor, HDC hDC, LPRECT rc, LPARAM data) -> BOOL {
+		auto &list = *reinterpret_cast<std::vector<int>*>(data);
+
+		MONITORINFOEX monitorInfo = {};
+		monitorInfo.cbSize = sizeof(MONITORINFOEX);
+		GetMonitorInfo(hMonitor, &monitorInfo);
+
+		DEVMODE devMode = {};
+		devMode.dmSize = sizeof(DEVMODE);
+		devMode.dmDriverExtra = 0;
+		EnumDisplaySettings(monitorInfo.szDevice, ENUM_CURRENT_SETTINGS, &devMode);
+
+		if (devMode.dmDisplayFrequency != 0) list.push_back(devMode.dmDisplayFrequency);
+		return true;
+	}, reinterpret_cast<LPARAM>(&rates));
+	return rates;
+}
+
 Dimension VideoDriver_Win32Base::GetScreenSize() const
 {
 	return { static_cast<uint>(GetSystemMetrics(SM_CXSCREEN)), static_cast<uint>(GetSystemMetrics(SM_CYSCREEN)) };
diff --git a/src/video/win32_v.h b/src/video/win32_v.h
index 93ebdd83e..f6ca291f1 100644
--- a/src/video/win32_v.h
+++ b/src/video/win32_v.h
@@ -33,6 +33,8 @@ public:
 
 	void EditBoxLostFocus() override;
 
+	std::vector<int> GetListOfMonitorRefreshRates() override;
+
 protected:
 	HWND main_wnd;          ///< Handle to system window.
 	bool fullscreen;        ///< Whether to use (true) fullscreen mode.