From 9dc29a75b416c6dab27ce93d0129383309cbf2c2 Mon Sep 17 00:00:00 2001
From: HybridDog <3192173+HybridDog@users.noreply.github.com>
Date: Sat, 3 Oct 2020 18:33:51 +0200
Subject: Reduce the FPS when the window is unfocused (#8837)

---
 src/gui/guiEngine.cpp | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

(limited to 'src/gui/guiEngine.cpp')

diff --git a/src/gui/guiEngine.cpp b/src/gui/guiEngine.cpp
index b40707d01..4a13f0b11 100644
--- a/src/gui/guiEngine.cpp
+++ b/src/gui/guiEngine.cpp
@@ -297,10 +297,14 @@ void GUIEngine::run()
 
 		driver->endScene();
 
+		IrrlichtDevice *device = RenderingEngine::get_raw_device();
+		u32 frametime_min = 1000 / (device->isWindowFocused()
+			? g_settings->getFloat("fps_max")
+			: g_settings->getFloat("fps_max_unfocused"));
 		if (m_clouds_enabled)
-			cloudPostProcess();
+			cloudPostProcess(frametime_min, device);
 		else
-			sleep_ms(25);
+			sleep_ms(frametime_min);
 
 		m_script->step();
 
@@ -367,9 +371,8 @@ void GUIEngine::cloudPreProcess()
 }
 
 /******************************************************************************/
-void GUIEngine::cloudPostProcess()
+void GUIEngine::cloudPostProcess(u32 frametime_min, IrrlichtDevice *device)
 {
-	float fps_max = g_settings->getFloat("pause_fps_max");
 	// Time of frame without fps limit
 	u32 busytime_u32;
 
@@ -380,12 +383,10 @@ void GUIEngine::cloudPostProcess()
 	else
 		busytime_u32 = 0;
 
-	// FPS limiter
-	u32 frametime_min = 1000./fps_max;
-
+	// FPS limit
 	if (busytime_u32 < frametime_min) {
 		u32 sleeptime = frametime_min - busytime_u32;
-		RenderingEngine::get_raw_device()->sleep(sleeptime);
+		device->sleep(sleeptime);
 	}
 }
 
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