Strict

Rem
bbdoc: User input/Polled input
End Rem
Module BRL.PolledInput

ModuleInfo "Version: 1.01"
ModuleInfo "Author: Mark Sibly, Simon Armstrong"
ModuleInfo "License: zlib/libpng"
ModuleInfo "Copyright: Blitz Research Ltd"
ModuleInfo "Modserver: BRL"

ModuleInfo "History: 1.01 Release"
ModuleInfo "History: Fixed charQueue bug"

Import BRL.System

Private

Global enabled
Global autoPoll=True
Global inputSource:Object
Global suspended,terminate

Global keyStates[256],keyHits[256]
Global charGet,charPut,charQueue[256]

Global mouseStates[4],mouseHits[4]
Global mouseLocation[4],lastMouseLocation[4]

Function Hook:Object( id,data:Object,context:Object )

	Local ev:TEvent=TEvent(data)
	If Not ev Return data
	
	If inputSource And inputSource<>ev.source Return data
	
	Select ev.id
	Case EVENT_KEYDOWN
		If Not keyStates[ev.data]
			keyStates[ev.data]=1
			keyHits[ev.data]:+1
		EndIf
	Case EVENT_KEYUP
		keyStates[ev.data]=0
	Case EVENT_KEYCHAR
		If charPut-charGet<256
			charQueue[charPut & 255]=ev.data
			charPut:+1
		EndIf
	Case EVENT_MOUSEDOWN
		If Not mouseStates[ev.data]
			mouseStates[ev.data]=1
			mouseHits[ev.data]:+1
		EndIf
	Case EVENT_MOUSEUP
		mouseStates[ev.data]=0
	Case EVENT_MOUSEMOVE
		mouseLocation[0]=ev.x
		mouseLocation[1]=ev.y
	Case EVENT_MOUSEWHEEL
		mouseLocation[2]:+ev.data
	Case EVENT_APPSUSPEND
		FlushKeys
		FlushMouse
		suspended=True
	Case EVENT_APPRESUME
		FlushKeys
		FlushMouse
		suspended=False
	Case EVENT_APPTERMINATE
		terminate=True
	End Select

	Return data

End Function

Public

Rem
Currently only called by Graphics/bglCreateContext.
Private for now, as it really needs a source:object parameter.
End Rem
Function EnablePolledInput( source:Object=Null )
	If enabled Return
	inputSource=source
	FlushKeys
	FlushMouse
	AddHook EmitEventHook,Hook,Null,0
	enabled=True
End Function

Rem
Currently only called by EndGraphics/bglDeleteContext
End Rem
Function DisablePolledInput()
	If Not enabled Return
	RemoveHook EmitEventHook,Hook
	FlushKeys
	FlushMouse
	inputSource=Null
	enabled=False
End Function

Rem
bbdoc: Get app suspended state
returns: True if application is currently suspended.
End Rem
Function AppSuspended()
	If autoPoll PollSystem
	Return suspended
End Function

Rem
bbdoc: Return app terminate state
returns: True if user has requested to terminate application
End Rem
Function AppTerminate()
	If autoPoll PollSystem
	Local n=terminate
	terminate=False
	Return n
End Function

Rem
bbdoc: Check for key hit
returns: Number of times @key has been hit.
about:
The returned value represents the number of the times @key has been hit since the last
call to #KeyHit with the same @key.

See the #{key codes} module for a list of valid key codes.
End Rem
Function KeyHit( key )
	If autoPoll PollSystem
	Local n=keyHits[key]
	keyHits[key]=0
	Return n
End Function

Rem
bbdoc: Check for key state
returns: #True if @key is currently down
about:
See the #{key codes} module for a list of valid keycodes.
End Rem
Function KeyDown( key )
	If autoPoll PollSystem
	Return keyStates[key]
End Function

Rem
bbdoc: Get next character
returns: The character code of the next character.
about:
As the user hits keys on the keyboard, BlitzMax records the character codes of these 
keystrokes into an internal 'character queue'.

#GetChar removes the next character code from this queue and returns it the application.

If the character queue is empty, 0 is returned.
End Rem
Function GetChar()
	If autoPoll PollSystem
	If charGet=charPut Return 0
	Local n=charQueue[charGet & 255]
	charGet:+1
	Return n
End Function

Rem
bbdoc: Flush key states and character queue.
about:
#FlushKeys resets the state of all keys to 'off', and resets the character queue
used by #GetChar.
End Rem
Function FlushKeys()
	PollSystem
	charGet=0
	charPut=0
	For Local i=0 Until 256
		keyStates[i]=0
		keyHits[i]=0
	Next
End Function

Rem
bbdoc: Get mouse x location
returns: Mouse x axis location
about:
The returned value is relative to the left of the screen.
end rem
Function MouseX()
	If autoPoll PollSystem
	Return mouseLocation[0]
End Function

Rem
bbdoc: Get mouse y location
returns: Mouse y axis location
about:
The returned value is relative to the top of the screen.
end rem
Function MouseY()
	If autoPoll PollSystem
	Return mouseLocation[1]
End Function

Rem
bbdoc: Get mouse wheel
returns: Mouse wheel value
about:
The mouse wheel value increments when the mouse wheel is rolled 'away' from the user, and
decrements when the mouse wheel is rolled 'towards' the user.
end rem
Function MouseZ()
	If autoPoll PollSystem
	Return mouseLocation[2]
End Function

Rem
bbdoc: Get mouse x speed
returns: Mouse x speed
End Rem
Function MouseXSpeed()
	If autoPoll PollSystem
	Local d=mouseLocation[0]-lastMouseLocation[0]
	lastMouseLocation[0]=mouseLocation[0]
	Return d
EndFunction

Rem
bbdoc: Get mouse y speed
returns: Mouse y speed
End Rem
Function MouseYSpeed()
	If autoPoll PollSystem
	Local d=mouseLocation[1]-lastMouseLocation[1]
	lastMouseLocation[1]=mouseLocation[1]
	Return d
EndFunction

Rem
bbdoc: Get mouse z speed
returns: Mouse z speed
End Rem
Function MouseZSpeed()
	If autoPoll PollSystem
	Local d=mouseLocation[2]-lastMouseLocation[2]
	lastMouseLocation[2]=mouseLocation[2]
	Return d
EndFunction

Rem
bbdoc: Flush mouse button states
about:
#FlushMouse resets the state of all mouse buttons to 'off'.
End Rem
Function FlushMouse()
	PollSystem
	For Local i=0 Until 4
		mouseStates[i]=0
		mouseHits[i]=0
	Next
	mouseLocation[2]=0
End Function

Rem
bbdoc: Check for mouse button click
returns: Number of times @button has been clicked.
about:
The returned value represents the number of the times @button has been clicked since the
last call to #MouseHit with the same @button.

@button should be 1 for the left mouse button, 2 for the right mouse button or 3 for the
middle mouse button.
End Rem
Function MouseHit( button )
	If autoPoll PollSystem
	Local n=mouseHits[button]
	mouseHits[button]=0
	Return n
End Function

Rem
bbdoc: Check for mouse button down state
returns: #True if @button is currently down
about:
@button should be 1 for the left mouse button, 2 for the right mouse button or 3 for the
middle mouse button.
end rem
Function MouseDown( button )
	If autoPoll PollSystem
	Return mouseStates[button]
End Function

Rem
bbdoc: Wait for a key press
returns: The keycode of the pressed key
about:
#WaitKey suspends program execution until a key has been hit. The keycode of this
key is then returned to the application.

See the #{key codes} module for a list of valid keycodes.
End Rem
Function WaitKey()
	FlushKeys
	Repeat
		WaitSystem
		For Local n=1 To 255
			If KeyHit(n) Return n
		Next
	Forever
End Function

Rem
bbdoc: Wait for a key press
returns: The character code of the pressed key
about:
#WaitChar suspends program execution until a character is available from #GetChar. This
character is then returned to the application.
End Rem
Function WaitChar()
	FlushKeys
	Repeat
		WaitSystem
		Local n=GetChar()
		If n Return n
	Forever
End Function

Rem
bbdoc: Wait for mouse button click
returns: The clicked button
about:
#WaitMouse suspends program execution until a mouse button is clicked.

#WaitMouse returns 1 if the left mouse button was clicked, 2 if the right mouse button was
clicked or 3 if the middle mouse button was clicked.
End Rem
Function WaitMouse()
	FlushMouse
	Repeat
		WaitSystem
		For Local n=1 To 3
			If MouseHit(n) Return n
		Next
	Forever
End Function