fix crashes when fullscreen d3d window loses focus

stepmania/src/RageDisplay.h

@@ -158,7 +158,7 @@ public:
 	/* Call this when the resolution has been changed externally: */
 	virtual void ResolutionChanged() { }
 
-	virtual void BeginFrame() = 0;	
+	virtual bool BeginFrame() = 0;	
 	virtual void EndFrame() = 0;
 	virtual VideoModeParams GetVideoModeParams() const = 0;
 	bool IsWindowed() const { return this->GetVideoModeParams().windowed; }

stepmania/src/RageDisplay_D3D.cpp

@@ -620,16 +620,23 @@ int RageDisplay_D3D::GetMaxTextureSize() const
 	return g_DeviceCaps.MaxTextureWidth;
 }
 
-void RageDisplay_D3D::BeginFrame()
+bool RageDisplay_D3D::BeginFrame()
 {
-#ifndef _XBOX
-	if( g_pd3dDevice->TestCooperativeLevel() == D3DERR_DEVICENOTRESET )
+#if !defined(XBOX)
+	switch( g_pd3dDevice->TestCooperativeLevel() )
+	{
+	case D3DERR_DEVICELOST:
+		return false;
+	case D3DERR_DEVICENOTRESET:
 		SetVideoMode( g_CurrentParams );
+		break;
+	}
 #endif
 
 	g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER,
 						 D3DCOLOR_XRGB(0,0,0), 1.0f, 0x00000000 );
 	g_pd3dDevice->BeginScene();
+	return true;
 }
 
 void RageDisplay_D3D::EndFrame()

stepmania/src/RageDisplay_D3D.h

@@ -26,7 +26,7 @@ public:
 	void ResolutionChanged();
 	const PixelFormatDesc *GetPixelFormatDesc(PixelFormat pf) const;
 
-	void BeginFrame();	
+	bool BeginFrame();	
 	void EndFrame();
 	VideoModeParams GetVideoModeParams() const;
 	void SetBlendMode( BlendMode mode );

stepmania/src/RageDisplay_Null.h

@@ -12,7 +12,7 @@ public:
 	void ResolutionChanged() { }
 	const PixelFormatDesc *GetPixelFormatDesc(PixelFormat pf) const;
 
-	void BeginFrame() { }
+	bool BeginFrame() { return true; }
 	void EndFrame();
 	VideoModeParams GetVideoModeParams() const { return m_Params; }
 	void SetBlendMode( BlendMode mode ) { }

stepmania/src/RageDisplay_OGL.cpp

@@ -743,8 +743,8 @@ void RageDisplay_OGL::ResolutionChanged()
  	SetViewport(0,0);
 
 	/* Clear any junk that's in the framebuffer. */
-	BeginFrame();
-	EndFrame();
+	if( BeginFrame() )
+		EndFrame();
 }
 
 // Return true if mode change was successful.
@@ -803,11 +803,12 @@ int RageDisplay_OGL::GetMaxTextureSize() const
 	return size;
 }
 
-void RageDisplay_OGL::BeginFrame()
+bool RageDisplay_OGL::BeginFrame()
 {
 	glClearColor( 0,0,0,1 );
 	SetZWrite( true );
     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+	return true;
 }
 
 void RageDisplay_OGL::EndFrame()

stepmania/src/RageDisplay_OGL.h

@@ -14,7 +14,7 @@ public:
 	void ResolutionChanged();
 	const PixelFormatDesc *GetPixelFormatDesc(PixelFormat pf) const;
 
-	void BeginFrame();	
+	bool BeginFrame();	
 	void EndFrame();
 	VideoModeParams GetVideoModeParams() const;
 	void SetBlendMode( BlendMode mode );

stepmania/src/ScreenManager.cpp

@@ -469,7 +469,8 @@ void ScreenManager::Draw()
 	if( m_ScreenStack.back()->IsFirstUpdate() )
 		return;
 
-	DISPLAY->BeginFrame();
+	if( !DISPLAY->BeginFrame() )
+		return;
 
 	if( !m_ScreenStack.empty() && !m_ScreenStack.back()->IsTransparent() )	// top screen isn't transparent
 		m_ScreenStack.back()->Draw();