Pong

Pong is a virtual table tennis arcade video game, featuring simple two-dimensional graphics. Each player controls one paddle on either side of the screen

Uxntal, 631 bytes compiled

|20 @Screen &vector $2 &width $2 &height $2 &auto $1 &pad $1 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1
|80 @Controller &vector $2 &button $1 &key $1
|000 @position $2 @score $2
|100 @on-reset ( -> )
	( | theme )
	#0f08 DEOk INC INC DEOk INC INC DEO
	;on-frame .Screen/vector DEO2
	[ LIT2 02 -Screen/auto ] DEO
	.Screen/width DEI2 .Screen/height DEI2
	( | court )
	;court-icn .Screen/addr DEO2
	OVR2 #01 SFT2 .Screen/x DEO2
	#0000 .Screen/y DEO2
	DUP2 #03 SFT2 SWP SUB
	&>l ( -- )
		[ LIT2 01 -Screen/sprite ] DEO
		INC DUP ?&>l
	POP
	( | bounds )
	#03 SFT2 DUP #01 SUB ;on-frame/b STA
	#05 SUB ;<move>/b STA
	POP #03 SFT2 #01 SUB ;on-frame/r STA
	POP ;fill-icn .Screen/addr DEO2
	<draw-score>
	<reset-ball>
	BRK

@on-frame ( -> )
	[ LIT &f $1 ] INCk ,&f STR
	( 30 fps ) #01 AND ?{ BRK }
	( | ball )
	[ LIT2 00 &y $1 ] DUP2 #30 SFT2 .Screen/y DEO2
	[ LIT2 00 &x $1 ] DUP2 #30 SFT2 .Screen/x DEO2
	[ LIT2 40 -Screen/sprite ] DEO
	DUP [ LIT &r $1 ] NEQ ?{ OVR2 #01 hit [ LIT2 ff _&dx ] STR }
	DUP ?{ OVR2 #00 hit [ LIT2 01 _&dx ] STR }
	[ LIT &dx 01 ] ADD DUP ,&x STR
	#30 SFT2 .Screen/x DEO2
	DUP [ LIT &b $1 ] NEQ ?{ [ LIT2 ff _&dy ] STR }
	DUP ?{ [ LIT2 01 _&dy ] STR }
	[ LIT &dy 01 ] ADD DUP ,&y STR
	#30 SFT2 .Screen/y DEO2
	[ LIT2 41 -Screen/sprite ] DEO
	( | controls )
	[ LIT2 ff -Controller/button ] DEI EOR
	DUP #10 AND ?{ #ff00 <move> }
	DUP #20 AND ?{ #0100 <move> }
	DUP #04 AND ?{ #ff01 <move> }
	DUP #01 AND ?{ #0101 <move> }
	POP
	( | paddles )
	.Screen/width DEI2 #0008 SUB2 .Screen/x DEO2
	#0000 .Screen/y DEO2
	.position LDZ2 <draw-paddle>
	#0000 DUP2 .Screen/x DEO2
	.Screen/y DEO2
	<draw-paddle>
	BRK

@on-frame-hit ( -> )
	[ LIT &f $1 ] INCk ,&f STR
	#40 NEQ ?{ ;on-frame .Screen/vector DEO2
		<reset-ball> }
	BRK

@<reset-ball> ( -- )
	#00 ;on-frame/x LDA #30 SFT2 .Screen/x DEO2
	#00 ;on-frame/y LDA #30 SFT2 .Screen/y DEO2
	[ LIT2 40 -Screen/sprite ] DEO
	.Screen/width DEI2 #04 SFT2 ;on-frame/x STA
	POP .Screen/height DEI2 #04 SFT2 ;on-frame/y STA
	POP JMP2r

@<move> ( offset id -- )
	( top ) DUP2 LDZ ADD INCk ?{ POP POP2 JMP2r }
	( bottom ) [ LIT &b $1 ] NEQ ?{ POP2 JMP2r }
	STHk LDZ ADD STHr STZ
	JMP2r

@<draw-paddle> ( y -- )
	STH
	;on-frame/b LDA #00
	&>l ( -- )
		DUP STHkr GTH OVR STHkr #06 ADD LTH AND .Screen/sprite DEO
		INC GTHk ?&>l
	POP2 POPr JMP2r

@hit ( y* id -- )
	ROT POP STHk LDZ SUB #05 GTH ?{ POPr JMP2r }
	STHr #00 EQU .score ADD LDZk INC SWP STZ
	;on-frame-hit .Screen/vector DEO2
	#00 ;on-frame-hit/f STA
	( >> )

@<draw-score> ( -- )
	#0010 .Screen/y DEO2
	[ LITr -Screen/width ] DEI2r [ LITr 01 ] SFT2r
	DUP2r [ LIT2r 0030 ] SUB2r [ LITr -Screen/x ] DEO2r
	.score LDZ2 SWP <draw-number>
	[ LIT2r 0010 ] ADD2r [ LITr -Screen/x ] DEO2r
	( >> )

@<draw-number> ( num -- )
	( clip ) #0a DIVk MUL SUB
	( seg. ) #00 SWP #20 SFT ;num-lut ADD2
	LDAk <draw-col>
	INC2 LDAk <draw-col>
	INC2 LDAk <draw-col>
	INC2 LDA
	( >> )

@<draw-col> ( bitmap -- )
	( save ) [ LITr -Screen/y ] DEI2kr STH
	#0800
	&>l ( -- )
		STHkr OVR SFT #01 AND .Screen/sprite DEO
		INC GTHk ?&>l
	POP2 POPr
	.Screen/x DEI2k #0008 ADD2 ROT DEO2
	( restore ) ROTr DEO2r
	JMP2r

@num-lut [
	ff81 81ff 0000 ff00 f989 898f 8989 89ff
	0f08 08ff 8f89 89f9 ff88 88f8 0101 01ff
	ff89 89ff 0f09 09ff ]

@fill-icn [ ffff ffff ffff ffff ]
@court-icn [ 0080 8000 0080 8000 ]