From 3cdf53732b52ae9e55162bf4b079f9e917176183 Mon Sep 17 00:00:00 2001
From: Henrik Rydgard <hrydgard@gmail.com>
Date: Sun, 29 Jun 2014 13:11:06 +0200
Subject: [PATCH] Make the emuthread idle when minimized on Windows.

---
 Core/Core.cpp             | 20 +++++++++++++++-----
 Core/Core.h               |  4 ++++
 Windows/WndMainWindow.cpp | 16 ++++++++++++++--
 3 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/Core/Core.cpp b/Core/Core.cpp
index 63894d4d0..ecc13619c 100644
--- a/Core/Core.cpp
+++ b/Core/Core.cpp
@@ -47,6 +47,7 @@ static event m_hInactiveEvent;
 static recursive_mutex m_hInactiveMutex;
 static bool singleStepPending = false;
 static std::set<Core_ShutdownFunc> shutdownFuncs;
+static bool windowHidden = false;
 
 #ifdef _WIN32
 InputState input_state;
@@ -54,6 +55,11 @@ InputState input_state;
 extern InputState input_state;
 #endif
 
+void Core_NotifyWindowHidden(bool hidden) {
+	windowHidden = hidden;
+	// TODO: Wait until we can react?
+}
+
 void Core_ListenShutdown(Core_ShutdownFunc func) {
 	shutdownFuncs.insert(func);
 }
@@ -143,20 +149,24 @@ static inline void UpdateRunLoop() {
 
 void Core_RunLoop() {
 	while ((GetUIState() != UISTATE_INGAME || !PSP_IsInited()) && GetUIState() != UISTATE_EXIT) {
-		time_update();
-
 #if defined(USING_WIN_UI)
+		time_update();
 		double startTime = time_now_d();
-		UpdateRunLoop();
+		if (!windowHidden) {
+			UpdateRunLoop();
+		}
 
 		// Simple throttling to not burn the GPU in the menu.
 		time_update();
 		double diffTime = time_now_d() - startTime;
-		int sleepTime = (int) (1000000.0 / 60.0) - (int) (diffTime * 1000000.0);
+		int sleepTime = (int)(1000000.0 / 60.0) - (int)(diffTime * 1000000.0);
 		if (sleepTime > 0)
 			Sleep(sleepTime / 1000);
-		GL_SwapBuffers();
+		if (!windowHidden) {
+			GL_SwapBuffers();
+		}
 #else
+		time_update();
 		UpdateRunLoop();
 #endif
 	}
diff --git a/Core/Core.h b/Core/Core.h
index d96601e98..2b10254d6 100644
--- a/Core/Core.h
+++ b/Core/Core.h
@@ -42,3 +42,7 @@ void Core_WaitInactive();
 void Core_WaitInactive(int milliseconds);
 
 void UpdateScreenScale(int width, int height);
+
+// Don't run the core when minimized etc.
+void Core_NotifyWindowHidden(bool hidden);
+
diff --git a/Windows/WndMainWindow.cpp b/Windows/WndMainWindow.cpp
index 78979f1a9..6e52816b3 100644
--- a/Windows/WndMainWindow.cpp
+++ b/Windows/WndMainWindow.cpp
@@ -244,6 +244,7 @@ namespace MainWindow {
 	}
 
 	void SetWindowSize(int zoom) {
+		AssertCurrentThreadName("Main");
 		RECT rc, rcOuter;
 		GetWindowRectAtResolution(480 * (int)zoom, 272 * (int)zoom, rc, rcOuter);
 		MoveWindow(hwndMain, rcOuter.left, rcOuter.top, rcOuter.right - rcOuter.left, rcOuter.bottom - rcOuter.top, TRUE);
@@ -913,8 +914,19 @@ namespace MainWindow {
 
 		switch (message) {
 		case WM_SIZE:
-			SavePosition();
-			ResizeDisplay();
+			switch (wParam) {
+			case SIZE_MAXIMIZED:
+			case SIZE_RESTORED:
+				Core_NotifyWindowHidden(false);
+				SavePosition();
+				ResizeDisplay();
+				break;
+			case SIZE_MINIMIZED:
+				Core_NotifyWindowHidden(true);
+				break;
+			default:
+				break;
+			}
 			break;
 
 		case WM_GETMINMAXINFO: