From 8fb0d6ddc5b9030094a3d5fa080a1cf5a1a38b4b Mon Sep 17 00:00:00 2001
From: rogerman <rogerman@users.noreply.github.com>
Date: Sat, 3 Mar 2018 20:41:23 -0800
Subject: [PATCH] Windows Port: Reduce CPU usage while the emulator is idle.

---
 desmume/src/frontend/windows/main.cpp | 32 ++++++++++++++++++++++-----
 1 file changed, 26 insertions(+), 6 deletions(-)

diff --git a/desmume/src/frontend/windows/main.cpp b/desmume/src/frontend/windows/main.cpp
index 4b13012cc..5098e6333 100755
--- a/desmume/src/frontend/windows/main.cpp
+++ b/desmume/src/frontend/windows/main.cpp
@@ -2082,14 +2082,31 @@ void displayProc()
 }
 
 
-void displayThread(void*)
+void displayThread(void *arg)
 {
-	for(;;) {
-		if(display_die) return;
+	do
+	{
+		if ( (MainWindow == NULL) || IsMinimized(MainWindow->getHWnd()) )
+		{
+			WaitForSingleObject(display_wakeup_event, INFINITE);
+		}
+		else if ( (emu_paused || !execute || !romloaded) && (!HudEditorMode && !CommonSettings.hud.ShowInputDisplay && !CommonSettings.hud.ShowGraphicalInputDisplay) )
+		{
+			WaitForSingleObject(display_wakeup_event, 250);
+		}
+		else
+		{
+			WaitForSingleObject(display_wakeup_event, 10);
+		}
+		
+		if (display_die)
+		{
+			break;
+		}
+		
 		displayProc();
-		//Sleep(10); //don't be greedy and use a whole cpu core, but leave room for 60fps 
-		WaitForSingleObject(display_wakeup_event, 10); // same as sleep but lets something wake us up early
-	}
+
+	} while (!display_die);
 }
 
 void KillDisplay()
@@ -2135,6 +2152,8 @@ void Display()
 		memcpy(db.buffer,dispInfo.masterCustomBuffer,targetSize);
 
 		slock_unlock(display_mutex);
+
+		SetEvent(display_wakeup_event);
 	}
 }
 
@@ -5090,6 +5109,7 @@ DOKEYDOWN:
 				
 				UpdateWndRects(hwnd);
 				MainWindowToolbar->OnSize();
+				SetEvent(display_wakeup_event);
 			}
 			break;
 		}