Fix compile warnings for Windows from Linux

At least the ones I got when I compiled it using Mingw64 POSIX on Xubuntu 18.04. Plus use the Size2 of get_window_size() directly, rather than reconstructing it.

drivers/rtaudio/audio_driver_rtaudio.cpp

@@ -114,11 +114,12 @@ Error AudioDriverRtAudio::init() {
 	unsigned int buffer_frames = closest_power_of_2(latency * mix_rate / 1000);
 	print_verbose("Audio buffer frames: " + itos(buffer_frames) + " calculated latency: " + itos(buffer_frames * 1000 / mix_rate) + "ms");
 
-	short int tries = 2;
+	short int tries = 4;
 
-	while (tries >= 0) {
+	while (tries > 0) {
 		switch (speaker_mode) {
 			case SPEAKER_MODE_STEREO: parameters.nChannels = 2; break;
+			case SPEAKER_SURROUND_31: parameters.nChannels = 4; break;
 			case SPEAKER_SURROUND_51: parameters.nChannels = 6; break;
 			case SPEAKER_SURROUND_71: parameters.nChannels = 8; break;
 		};
@@ -133,7 +134,9 @@ Error AudioDriverRtAudio::init() {
 			ERR_PRINT("Unable to open audio, retrying with fewer channels...");
 
 			switch (speaker_mode) {
-				case SPEAKER_SURROUND_51: speaker_mode = SPEAKER_MODE_STEREO; break;
+				case SPEAKER_MODE_STEREO: break; // Required to silence unhandled enum value warning.
+				case SPEAKER_SURROUND_31: speaker_mode = SPEAKER_MODE_STEREO; break;
+				case SPEAKER_SURROUND_51: speaker_mode = SPEAKER_SURROUND_31; break;
 				case SPEAKER_SURROUND_71: speaker_mode = SPEAKER_SURROUND_51; break;
 			}
 

platform/windows/context_gl_win.cpp

@@ -92,9 +92,9 @@ Error ContextGL_Win::initialize() {
 				PFD_SUPPORT_OPENGL | // Format Must Support OpenGL
 				PFD_DOUBLEBUFFER,
 		(BYTE)PFD_TYPE_RGBA,
-		OS::get_singleton()->is_layered_allowed() ? (BYTE)32 : (BYTE)24,
+		(BYTE)(OS::get_singleton()->is_layered_allowed() ? 32 : 24),
 		(BYTE)0, (BYTE)0, (BYTE)0, (BYTE)0, (BYTE)0, (BYTE)0, // Color Bits Ignored
-		OS::get_singleton()->is_layered_allowed() ? (BYTE)8 : (BYTE)0, // Alpha Buffer
+		(BYTE)(OS::get_singleton()->is_layered_allowed() ? 8 : 0), // Alpha Buffer
 		(BYTE)0, // Shift Bit Ignored
 		(BYTE)0, // No Accumulation Buffer
 		(BYTE)0, (BYTE)0, (BYTE)0, (BYTE)0, // Accumulation Bits Ignored

platform/windows/joypad.cpp

@@ -172,7 +172,7 @@ bool JoypadWindows::setup_dinput_joypad(const DIDEVICEINSTANCE *instance) {
 
 	joy->di_joy->SetDataFormat(&c_dfDIJoystick2);
 	joy->di_joy->SetCooperativeLevel(*hWnd, DISCL_FOREGROUND);
-	joy->di_joy->EnumObjects(objectsCallback, this, NULL);
+	joy->di_joy->EnumObjects(objectsCallback, this, 0);
 	joy->joy_axis.sort();
 
 	joy->guid = instance->guidInstance;

platform/windows/os_windows.cpp

@@ -763,7 +763,7 @@ LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 
 				RECT r;
 				GetWindowRect(hWnd, &r);
-				dib_size = Size2(r.right - r.left, r.bottom - r.top);
+				dib_size = Size2i(r.right - r.left, r.bottom - r.top);
 
 				BITMAPINFO bmi;
 				ZeroMemory(&bmi, sizeof(BITMAPINFO));
@@ -773,7 +773,7 @@ LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 				bmi.bmiHeader.biPlanes = 1;
 				bmi.bmiHeader.biBitCount = 32;
 				bmi.bmiHeader.biCompression = BI_RGB;
-				bmi.bmiHeader.biSizeImage = dib_size.x, dib_size.y * 4;
+				bmi.bmiHeader.biSizeImage = dib_size.x * dib_size.y * 4;
 				hBitmap = CreateDIBSection(hDC_dib, &bmi, DIB_RGB_COLORS, (void **)&dib_data, NULL, 0x0);
 				SelectObject(hDC_dib, hBitmap);
 
@@ -1050,7 +1050,6 @@ static int QueryDpiForMonitor(HMONITOR hmon, _MonitorDpiType dpiType = MDT_Defau
 
 	UINT x = 0, y = 0;
 	HRESULT hr = E_FAIL;
-	bool bSet = false;
 	if (hmon && (Shcore != (HMODULE)INVALID_HANDLE_VALUE)) {
 		hr = getDPIForMonitor(hmon, dpiType /*MDT_Effective_DPI*/, &x, &y);
 		if (SUCCEEDED(hr) && (x > 0) && (y > 0)) {
@@ -1229,7 +1228,7 @@ Error OS_Windows::initialize(const VideoMode &p_desired, int p_video_driver, int
 
 			printf("Error setting WNDPROC: %li\n", le);
 		};
-		LONG_PTR proc = GetWindowLongPtr(hWnd, GWLP_WNDPROC);
+		GetWindowLongPtr(hWnd, GWLP_WNDPROC);
 
 		RECT rect;
 		if (!GetClientRect(hWnd, &rect)) {
@@ -1728,14 +1727,18 @@ void OS_Windows::set_window_position(const Point2 &p_position) {
 Size2 OS_Windows::get_window_size() const {
 
 	RECT r;
-	GetClientRect(hWnd, &r);
-	return Vector2(r.right - r.left, r.bottom - r.top);
+	if (GetClientRect(hWnd, &r)) { // Only area inside of window border
+		return Size2(r.right - r.left, r.bottom - r.top);
+	}
+	return Size2();
 }
 Size2 OS_Windows::get_real_window_size() const {
 
 	RECT r;
-	GetWindowRect(hWnd, &r);
-	return Vector2(r.right - r.left, r.bottom - r.top);
+	if (GetWindowRect(hWnd, &r)) { // Includes area of the window border
+		return Size2(r.right - r.left, r.bottom - r.top);
+	}
+	return Size2();
 }
 void OS_Windows::set_window_size(const Size2 p_size) {
 
@@ -2274,7 +2277,6 @@ void OS_Windows::set_custom_mouse_cursor(const RES &p_cursor, CursorShape p_shap
 		ERR_FAIL_COND(!image.is_valid());
 
 		UINT image_size = texture_size.width * texture_size.height;
-		UINT size = sizeof(UINT) * image_size;
 
 		// Create the BITMAP with alpha channel
 		COLORREF *buffer = (COLORREF *)memalloc(sizeof(COLORREF) * image_size);
@@ -2746,11 +2748,6 @@ void OS_Windows::run() {
 
 	main_loop->init();
 
-	uint64_t last_ticks = get_ticks_usec();
-
-	int frames = 0;
-	uint64_t frame = 0;
-
 	while (!force_quit) {
 
 		process_events(); // get rid of pending events

scene/main/viewport.cpp

@@ -629,10 +629,8 @@ Rect2 Viewport::get_visible_rect() const {
 	Rect2 r;
 
 	if (size == Size2()) {
-
-		r = Rect2(Point2(), Size2(OS::get_singleton()->get_window_size().width, OS::get_singleton()->get_window_size().height));
+		r = Rect2(Point2(), OS::get_singleton()->get_window_size());
 	} else {
-
 		r = Rect2(Point2(), size);
 	}