Fixed DirectX9 reinitialisation

BeebEm would revert to GDI rendering after the host PC
resumes from being suspended and, as reported in
issue #104 could in some case enter a loop continually
resetting the screen mode on entering full screen.

This commit adds handling for D3DERR_DEVICELOST
errors from IDirect3DDevice9::Present().

Src/BeebWin.cpp

@@ -192,18 +192,33 @@ BeebWin::BeebWin()
 	m_printerbufferlen = 0;
 	m_translateCRLF = true;
 	m_CurrentDisplayRenderer = 0;
+	m_hInstDDraw = nullptr;
+	m_DD = nullptr;
+	m_DD2  = nullptr;
+	m_DDSPrimary = nullptr;
+	m_DDS2Primary = nullptr;
+	m_DDSOne = nullptr;
+	m_DDS2One = nullptr;
 	m_DXSmoothing = true;
 	m_DXSmoothMode7Only = false;
+	m_Clipper = nullptr;
+
+	m_pD3D = nullptr;
+	m_pd3dDevice = nullptr;
+	m_pVB = nullptr;
+	m_pTexture = nullptr;
+	ZeroMemory(&m_TextureMatrix, sizeof(m_TextureMatrix));
+
+	m_DXInit = false;
 	m_DXResetPending = false;
+	m_DXDeviceLost = false;
 
 	m_JoystickCaptured = false;
 	m_isFullScreen = false;
 	m_MaintainAspectRatio = true;
 	m_startFullScreen = false;
 	m_XDXSize = 640;
 	m_YDXSize = 480;
-	m_XScrSize = GetSystemMetrics(SM_CXSCREEN);
-	m_YScrSize = GetSystemMetrics(SM_CYSCREEN);
 	m_XWinBorder = GetSystemMetrics(SM_CXSIZEFRAME) * 2;
 	m_YWinBorder = GetSystemMetrics(SM_CYSIZEFRAME) * 2 +
 	               GetSystemMetrics(SM_CYMENUSIZE) +
@@ -479,6 +494,8 @@ BeebWin::~BeebWin()
 	if (m_DisplayRenderer != IDM_DISPGDI)
 		ExitDX();
 
+	CloseDX9();
+
 	ReleaseDC(m_hWnd, m_hDC);
 
 	if (m_hOldObj != NULL)
@@ -2053,6 +2070,7 @@ LRESULT BeebWin::WndProc(UINT nMessage, WPARAM wParam, LPARAM lParam)
 			break;
 
 		case WM_REINITDX:
+			DebugTrace("WM_REINITDX\n");
 			ReinitDX();
 			break;
 
@@ -2077,6 +2095,10 @@ LRESULT BeebWin::WndProc(UINT nMessage, WPARAM wParam, LPARAM lParam)
 			userPortBreakoutDialog = nullptr;
 			break;
 
+		case WM_DIRECTX9_DEVICE_LOST:
+			OnDeviceLost();
+			break;
+
 		default: // Passes it on if unproccessed
 			return DefWindowProc(m_hWnd, nMessage, wParam, lParam);
 	}

Src/BeebWin.h

@@ -261,7 +261,7 @@ class BeebWin {
 	void ShowMenu(bool on);
 	void HideMenu(bool hide);
 	void TrackPopupMenu(int x, int y);
-	bool IsFullScreen() { return m_isFullScreen; }
+	bool IsFullScreen() const { return m_isFullScreen; }
 	void ResetTiming(void);
 	int TranslateKey(int vkey, bool keyUp, int &row, int &col);
 	void ParseCommandLine(void);
@@ -330,12 +330,15 @@ class BeebWin {
 	// DirectDraw
 	HRESULT InitDirectDraw();
 	HRESULT InitSurfaces();
-	void ResetSurfaces();
+	void CloseSurfaces();
 
 	// DirectX9
-	HRESULT InitDX9();
-	void ExitDX9();
+	bool InitDX9();
+	void CloseDX9();
+	HRESULT InitD3DDevice();
+	void CloseD3DDevice();
 	void RenderDX9();
+	void OnDeviceLost();
 
 	void TranslateWindowSize(void);
 	void TranslateDDSize(void);
@@ -482,8 +485,6 @@ class BeebWin {
 	int m_YWinPos;
 	int m_XDXSize;
 	int m_YDXSize;
-	int m_XScrSize;
-	int m_YScrSize;
 	int m_XWinBorder;
 	int m_YWinBorder;
 	float m_XRatioAdj;
@@ -512,6 +513,7 @@ class BeebWin {
 	// DirectX stuff
 	bool m_DXInit;
 	bool m_DXResetPending;
+	bool m_DXDeviceLost;
 
 	// DirectDraw stuff
 	HINSTANCE m_hInstDDraw;