Creating MAX Screensaver

Heres a copy working in 1.26, just some minor fixes.

Framework BRL.GLMax2D
Import BRL.Basic
Import BRL.System
Import BRL.Retro
Import PUB.Win32
Import "-lshell32"
Import "-luser32"
Import "-lkernel32"

Extern "win32"
	Function FindWindow (x:Byte Ptr, y:Byte Ptr) = "FindWindowA@8"
	Function SetParent (hWnd1,hWnd2) = "SetParent@8"
	Function CreateSemaphore (a:Byte Ptr, b:Int, c:Int, d:String) = "CreateSemaphoreW@16"
	Function GetLastError () = "GetLastError@0"
EndExtern

'**************** Get Current Desktop Resolution *******************
Global r:Int[4] 

' This is advisable because it is best not to switch screen
deskWnd = GetDesktopWindow( ) 		' settings when the screen saver starts.
GetWindowRect( deskWnd ,r )

Global DeskWidth :Float =r[2]
Global DeskHeight:Float =r[3] 
'**************** End Get Current Desktop Resolution ***************

Global Width: Float = 0
Global Height:Float = 0
Global startmousex:Int = 0
Global startmousey:Int = 0

Const ERROR_ALREADY_EXISTS:Int = 183
Const PREVIEW_ACTIVE:Int = 0
Const CONFIG_ACTIVE:Int = 1
Const SAVER_ACTIVE:Int = 2

Global PrevWnd:Int
If AppArgs.length = 3  
	PrevWnd:Int = Int( AppArgs[2] ) 	'Handle of the preview window
EndIf
Global pscale:Float = 1 				'scale value to apply depending on screen size
Global bmw:Int = 0 						'Handle of the BMax window
Global Status:Int = 0 					'Program status, identifies preview, regular, or config modes
Global timemark:Int = 0 				'Time marker to use for a makeshift timer

SetGraphicsDriver GLMax2DDriver( )

If AppArgs.length > 1 
	Select AppArgs[1]
		Case "/p"
			InitPreviewMode( )
		Case "/s"
			InitSaverMode( )
		Case "/c"
			InitConfigMode( )
		Default
			InitConfigMode( )
	End Select  
Else
	InitConfigMode( )
EndIf 


While Not KeyHit( KEY_ESCAPE )

	'**************** TODO: Write your own presentation code ***************
	'
	' Multiply any scaling by pscale (=1 in Saver mode, .15-.25 in Preview)
	' You will scale your speeds too (nothing moving in this one)
	'
	'***********************************************************************
	Cls
	SetColor 255,255,255
	DrawOval 0,0,200,200
	SetColor 255,0,0
	DrawOval Width-(200*pscale),0,200,200
	SetColor 0,255,0
	DrawOval 0,Height-(200*pscale),200,200
	SetColor 0,0,255
	DrawOval Width-(200*pscale),Height-(200*pscale),200,200
	Flip 
	
	'******* This block is boilerplate ********
	Select Status 
		Case PREVIEW_ACTIVE
			CheckVisible( )
		Case SAVER_ACTIVE
			CheckMovement( )
	End Select 
	'************* Do Not Remove **************

Wend

End

Function InitSaverMode()
	If SetProcessLock( "SaverModeLock" ) <> 0 Then End
	Status = SAVER_ACTIVE
	Width = DeskWidth
	Height = DeskHeight
	Graphics Width, Height, 32
	SetWindowPos( FindWindow( Null, "BlitzMax Application" ), HWND_TOPMOST, 0,0, 0,0, SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE)
	pscale = 1
	startmousex = MouseX()
	startmousey = MouseY()
	FlushMouse
	FlushKeys
	Return
EndFunction

Function InitPreviewMode( )
	If SetProcessLock( "PreviewModeLock" ) <> 0 Then End
	Status = PREVIEW_ACTIVE
	Width = 152
	Height = 112
	Graphics Width, Height, 0
	bmw = FindWindow( Null, "BlitzMax Application" )
	Local bmx_Style = GetWindowLongW( bmw, -16 )
	bmx_Style = bmx_Style And $40000000 Or $800000 And $10000000
	SetWindowLongW bmw, -16, bmx_Style;
	SetParent( bmw,PrevWnd )
	MoveWindow ( bmw, 0, 0, 152, 112, True )
	pscale = 152/DeskWidth
	SetScale pscale, pscale
	timemark = MilliSecs()
	FlushMouse
	FlushKeys	
	Return
EndFunction

Function InitConfigMode( )
	Status = CONFIG_ACTIVE
	Width = 320
	Height = 200
	AppTitle = "Configuration Screen"
	Graphics Width,Height, 0
	bmw = FindWindow( Null, "Configuration Screen" )
	MoveWindow ( bmw, ( DeskWidth/2-Width/2 ),( DeskHeight/2-Height/2 ), 320, 200, True )
	FlushMouse
	FlushKeys
	
	SetClsColor 192, 192, 192
	SetColor 0, 0, 0
	Cls
	DrawText "TODO: Write config code", 50, 80
	DrawText "Press <ANY KEY> to exit", 55, 130
	Flip
	WaitKey
	End
EndFunction

Function SetProcessLock:Int( LockStr:String )
	Global MySem = CreateSemaphore( Null, 0, 1, LockStr )
	If MySem <> 0 And GetLastError( ) = ERROR_ALREADY_EXISTS
		Return 1
	Else
		Return 0
	EndIf
EndFunction

Function CheckVisible( )
	If MilliSecs()-timemark > 2000 'Delay visibility check til window is drawn
		If Not IsWindowVisible( PrevWnd )
			End
		EndIf
	EndIf
EndFunction

Function CheckMovement( )
	If MouseX( ) <> startmousex Or MouseY( ) <> startmousey Then End
	If GetChar( ) <> 0 Then End
	'Probably want to put some more keyhits in here; I'm too lazy
EndFunction