Fix GL screensavers in non-direct mode.

DirectDraw is called only in direct drawing mode (BDirectWindow). Our GL
kit also works fine (but slower) in indirect mode (standard BWindow, GL
stuff rendered offscreen then blitted). However, for this to work we
need the screensavers to actually do something. Use the
BScreenSaver::Draw method, which is called in either case.

This makes it possible to use indirect mode for the preview of GL
screensavers. The performance isn't really a problem on the very small
preview (160x200 pixels).

Fixes GLife and Gravity. Flurry still crashes Mesa.

src/add-ons/screen_savers/flurry/Flurry.cpp

@@ -360,7 +360,7 @@ Flurry::StopSaver()
 
 
 void
-Flurry::DirectDraw(int32 frame)
+Flurry::Draw(BView*, int32 frame)
 {
 	fFlurryView->DrawFlurryScreenSaver();
 }

src/add-ons/screen_savers/flurry/Flurry.h

@@ -54,7 +54,7 @@ public:
 	virtual	status_t				StartSaver(BView* view, bool preview);
 	virtual	void					StopSaver();
 
-	virtual	void					DirectDraw(int32 frame);
+	virtual	void					Draw(BView*, int32 frame);
 	virtual	void					DirectConnected(direct_buffer_info* info);
 
 	virtual	void					StartConfig(BView* configView);

src/add-ons/screen_savers/glife/GLifeSaver.cpp

@@ -111,7 +111,7 @@ GLifeSaver::DirectConnected(direct_buffer_info* pdbiInfo)
 // ------------------------------------------------------
 //  GLifeSaver Class DirectDraw Definition
 void
-GLifeSaver::DirectDraw(int32 iFrame)
+GLifeSaver::Draw(BView*, int32 iFrame)
 {
 	fGLifeViewport->Advance();
 }

src/add-ons/screen_savers/glife/GLifeSaver.h

@@ -29,7 +29,7 @@ public:
 	// Constructor
 				GLifeSaver(BMessage*, image_id);
 
-	// State/Preferences Methods			
+	// State/Preferences Methods
 	status_t	SaveState(BMessage*) const;
 	void		RestoreState(BMessage*);
 	void		StartConfig(BView*);
@@ -40,7 +40,7 @@ public:
 
 	// Graphics Methods
 	void		DirectConnected(direct_buffer_info*);
-	void		DirectDraw(int32);
+	void		Draw(BView*, int32);
 
 private:
 	GLifeState	fGLifeState;

src/add-ons/screen_savers/gravity/Gravity.cpp

@@ -90,7 +90,7 @@ Gravity::DirectConnected(direct_buffer_info* info)
 
 
 void
-Gravity::DirectDraw(int32 frame)
+Gravity::Draw(BView*, int32 frame)
 {
 	fGravityView->DirectDraw();
 }

src/add-ons/screen_savers/gravity/Gravity.h

@@ -39,7 +39,7 @@ public:
 			void			StopSaver();
 
 			void			DirectConnected(direct_buffer_info* info);
-			void			DirectDraw(int32 frame);
+			void			Draw(BView*, int32 frame);
 
 private:
 			GravityView*	fGravityView;