( piano )

%+  { ADD } %-   { SUB }  %*  { MUL } %/   { DIV }
%<  { LTH } %>   { GTH }  %=  { EQU } %!   { NEQ }
%++ { ADD2 } %-- { SUB2 } %** { MUL2 } %// { DIV2 }
%<< { LTH2 } %>> { GTH2 } %== { EQU2 } %!! { NEQ2 }
%!~ { NEQk NIP }

%HALT { #010f DEO }

%RTN  { JMP2r }
%TOS  { #00 SWP }
%MOD  { DUP2 / * - }
%GTS2 { #8000 ++ SWP2 #8000 ++ << }
%2/   { #01 SFT }
%2//  { #01 SFT2 }
%4//  { #02 SFT2 }
%8//  { #03 SFT2 }
%8**  { #30 SFT2 }

%AUTO-NONE   { #00 .Screen/auto DEO }
%AUTO-X      { #01 .Screen/auto DEO }
%AUTO-YADDR  { #06 .Screen/auto DEO }

( devices )

|00 @System     &vector $2 &wst      $1 &rst    $1 &pad    $4 &r      $2 &g      $2 &b      $2 &debug  $1 &halt $1
|10 @Console    &vector $2 &read     $1 &pad    $5 &write  $1 &error  $1
|20 @Screen     &vector $2 &width $2 &height $2 &auto $1 &pad $1 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1
|30 @Audio0     &vector $2 &position $2 &output $1 &pad    $3 &adsr   $2 &length $2 &addr   $2 &volume $1 &pitch $1
|80 @Controller &vector $2 &button   $1 &key    $1
|90 @Mouse      &vector $2 &x        $2 &y      $2 &state  $1 &pad    $3 &modx   $2 &mody   $2
|a0 @File       &vector $2 &success  $2 &stat   $2 &delete $1 &append $1 &name   $2 &length $2 &read   $2 &write $2

( variables )

|0000

@last-note   $1
@octave      $1
@pointer     
	&x $2 &y $2
@center      
	&x $2 &y $2
@adsr-view   
	&x1 $2 &y1 $2 &x2 $2 &y2 $2
@wave-view   
	&x1 $2 &y1 $2 &x2 $2 &y2 $2
@octave-view 
	&x1 $2 &y1 $2 &x2 $2 &y2 $2

( program )

|0100 ( -> )
	
	( theme ) 
	#0fe5 .System/r DEO2 
	#0fc5 .System/g DEO2 
	#0f25 .System/b DEO2

	( vectors ) 
	;on-frame   .Screen/vector DEO2
	;on-control .Controller/vector DEO2
	;on-mouse   .Mouse/vector DEO2
	;on-message .Console/vector DEO2

	( find center )
	.Screen/width DEI2 2// .center/x STZ2
	.Screen/height DEI2 2// .center/y STZ2

	( place octave )
	.center/x LDZ2 #0080 -- .octave-view/x1 STZ2
	.center/y LDZ2 #0008 ++ .octave-view/y1 STZ2
	.octave-view/x1 LDZ2 #0050 ++ .octave-view/x2 STZ2
	.octave-view/y1 LDZ2 #0018 ++ .octave-view/y2 STZ2

	( place adsr )
	.center/x LDZ2 #0020 -- .adsr-view/x1 STZ2
	.center/y LDZ2 #0008 ++ .adsr-view/y1 STZ2
	.adsr-view/x1 LDZ2 #00a0 ++ .adsr-view/x2 STZ2
	.adsr-view/y1 LDZ2 #0018 ++ .adsr-view/y2 STZ2

	( place waveform )
	.center/x LDZ2 #0080 -- .wave-view/x1 STZ2
	.center/y LDZ2 #0020 -- .wave-view/y1 STZ2
	.wave-view/x1 LDZ2 #0100 ++ .wave-view/x2 STZ2
	.wave-view/y1 LDZ2 #0020 ++ .wave-view/y2 STZ2

	( default settings )
	#ff .last-note STZ
	#041c .Audio0/adsr DEO2
	#dd .Audio0/volume DEO
	;sin-pcm .Audio0/addr DEO2
	#0100 .Audio0/length DEO2

	( inital drawing ) 
	;draw-octave JSR2
	;draw-adsr JSR2
	;draw-wave JSR2

BRK

( this data exists to test literals
  as well as multi-line ( and nested )
  comments )
@test-dat "this 20 "is 20 'a 20 "test 00
@test-ptr :test-dat

@on-frame ( -> )
	
	.adsr-view/y2 LDZ2 #0020 -- .Screen/y DEO2

	#10 #00 
	&loop
		.adsr-view/x2 LDZ2 #003a -- .Screen/x DEO2
		#10 OVR - .Audio0/output DEI #0f AND < .Screen/pixel DEO
		.adsr-view/x2 LDZ2 #003a -- INC2 INC2 .Screen/x DEO2
		#10 OVR - .Audio0/output DEI #04 SFT < .Screen/pixel DEO
		.Screen/y DEI2 INC2 INC2 .Screen/y DEO2
		INC GTHk ,&loop JCN
	POP2

BRK

@on-control ( -> )

	( clear last cursor )
	.pointer/x LDZ2 .Screen/x DEO2 
	.pointer/y LDZ2 .Screen/y DEO2 
	#40 .Screen/sprite DEO

	.Controller/key DEI
	[ LIT 'a ] !~ ,&no-c JCN
		#30 .octave LDZ #0c * + ;play JSR2 &no-c
	[ LIT 's ] !~ ,&no-d JCN
		#32 .octave LDZ #0c * + ;play JSR2 &no-d
	[ LIT 'd ] !~ ,&no-e JCN
		#34 .octave LDZ #0c * + ;play JSR2 &no-e
	[ LIT 'f ] !~ ,&no-f JCN
		#35 .octave LDZ #0c * + ;play JSR2 &no-f
	[ LIT 'g ] !~ ,&no-g JCN
		#37 .octave LDZ #0c * + ;play JSR2 &no-g
	[ LIT 'h ] !~ ,&no-a JCN
		#39 .octave LDZ #0c * + ;play JSR2 &no-a
	[ LIT 'j ] !~ ,&no-b JCN
		#3b .octave LDZ #0c * + ;play JSR2 &no-b
	[ LIT 'k ] !~ ,&no-c2 JCN
		#3c .octave LDZ #0c * + ;play JSR2 &no-c2
	[ #1b ] !~ ,&no-esc JCN HALT &no-esc
	POP

	( release )
	#00 .Controller/key DEO

	.Controller/button DEI 
	DUP #11 ! ,&cu JCN #3c ;play JSR2 &cu
	DUP #21 ! ,&cd JCN #3d ;play JSR2 &cd
	DUP #41 ! ,&cl JCN #3e ;play JSR2 &cl
	DUP #81 ! ,&cr JCN #3f ;play JSR2 &cr
	DUP #12 ! ,&au JCN #40 ;play JSR2 &au
	DUP #22 ! ,&ad JCN #41 ;play JSR2 &ad
	DUP #42 ! ,&al JCN #42 ;play JSR2 &al
	DUP #82 ! ,&ar JCN #43 ;play JSR2 &ar
	DUP #14 ! ,&su JCN #44 ;play JSR2 &su
	DUP #24 ! ,&sd JCN #45 ;play JSR2 &sd
	DUP #44 ! ,&sl JCN #46 ;play JSR2 &sl
	DUP #84 ! ,&sr JCN #47 ;play JSR2 &sr
	DUP #40 ! ,&l JCN .Audio0/addr DEI2 #0010 -- .Audio0/addr DEO2 &l
	DUP #80 ! ,&r JCN .Audio0/addr DEI2 #0010 ++ .Audio0/addr DEO2 &r
	POP

	;draw-octave JSR2
	;draw-wave JSR2

BRK

@on-message ( -> )
	
	.Console/read DEI ;play JSR2
	;draw-octave JSR2

BRK

@on-mouse ( -> )

	;draw-cursor JSR2 
	
	.Mouse/state DEI #00 ! #01 JCN [ BRK ]

	.Mouse/x DEI2 .Mouse/y DEI2 .wave-view ;within-rect JSR2 
		;on-touch-wave-view JCN2
	.Mouse/x DEI2 .Mouse/y DEI2 .adsr-view ;within-rect JSR2 
		;on-touch-adsr-view JCN2
	.Mouse/x DEI2 .Mouse/y DEI2 .octave-view ;within-rect JSR2 
		;on-touch-octave-view JCN2

BRK

@on-touch-wave-view ( -> )

	.Mouse/x DEI2 .wave-view/x1 LDZ2 -- .Audio0/length DEO2
	;draw-wave JSR2
	;draw-cursor JSR2 

BRK

@on-touch-octave-view ( -> )

	.Mouse/x DEI2 .octave-view/x1 LDZ2 -- 8// NIP #09 ! ,&no-mod JCN
		.Mouse/y DEI2 .octave-view/y1 LDZ2 -- 8// NIP 
		[ #00 ] !~ ,&no-incr JCN
			.octave LDZ #03 = ,&no-incr JCN
			.octave LDZ INC .octave STZ &no-incr
		[ #02 ] !~ ,&no-decr JCN
			.octave LDZ #ff = ,&no-decr JCN
			.octave LDZ #01 - .octave STZ &no-decr
		POP
		( release ) #00 .Mouse/state DEO
		;draw-octave JSR2
		BRK
	&no-mod

	.Mouse/x DEI2 .octave-view/x1 LDZ2 -- 8// NIP #06 > ,&no-key JCN
		.Mouse/x DEI2 .octave-view/x1 LDZ2 -- 8// ;notes ++ LDA .octave LDZ #0c * + ;play JSR2
		( release ) #00 .Mouse/state DEO
		;draw-octave JSR2
	&no-key

BRK 

@on-touch-adsr-view ( -> )

	.Mouse/x DEI2 .adsr-view/x1 LDZ2 -- 8// NIP #03 /
	[ #00 ] !~ ,&no-a JCN
		.Audio0/adsr DEI
		#10 .Mouse/state DEI #10 = #e0 * + +
		.Audio0/adsr DEO &no-a
	[ #01 ] !~ ,&no-d JCN
		.Audio0/adsr DEI
		DUP #f0 AND STH #01 .Mouse/state DEI #10 = #0e * + + #0f AND STHr +
		.Audio0/adsr DEO &no-d
	[ #02 ] !~ ,&no-s JCN
		.Audio0/adsr INC DEI
		#10 .Mouse/state DEI #10 = #e0 * + +
		.Audio0/adsr INC DEO &no-s
	[ #03 ] !~ ,&no-r JCN
		.Audio0/adsr INC DEI
		DUP #f0 AND STH #01 .Mouse/state DEI #10 = #0e * + + #0f AND STHr +
		.Audio0/adsr INC DEO &no-r
	[ #05 ] !~ ,&no-left JCN
		.Audio0/volume DEI 
		#10 .Mouse/state DEI #10 = #e0 * + +
		.Audio0/volume DEO &no-left
	[ #06 ] !~ ,&no-right JCN
		.Audio0/volume DEI
		DUP #f0 AND STH #01 .Mouse/state DEI #10 = #0e * + + #0f AND STHr +
		.Audio0/volume DEO &no-right
	POP

	( release ) #00 .Mouse/state DEO
	;draw-adsr JSR2
	;draw-cursor JSR2 

BRK

@play ( pitch -- )
	
	DUP #0c MOD .last-note STZ 
	.Audio0/pitch DEO

RTN

@draw-cursor ( -- )
	
	( clear last cursor )
	;cursor .Screen/addr DEO2 
	.pointer/x LDZ2 .Screen/x DEO2 
	.pointer/y LDZ2 .Screen/y DEO2 
	#40 .Screen/sprite DEO
	( record pointer positions )
	.Mouse/x DEI2 DUP2 .pointer/x STZ2 .Screen/x DEO2 
	.Mouse/y DEI2 DUP2 .pointer/y STZ2 .Screen/y DEO2  
	( colorize on state )
	#41 [ .Mouse/state DEI #00 ! ] + .Screen/sprite DEO

RTN

@draw-octave ( -- )
	
	.octave-view/x1 LDZ2 #0048 ++ .Screen/x DEO2

	;arrow-icns .Screen/addr DEO2
	.octave-view/y1 LDZ2 .Screen/y DEO2
	#01 .Screen/sprite DEO

	;arrow-icns #0008 ++ .Screen/addr DEO2
	.octave-view/y1 LDZ2 #0010 ++ .Screen/y DEO2
	#01 .Screen/sprite DEO

	;font-hex .octave LDZ #03 + #00 SWP 8** ++ .Screen/addr DEO2
	.octave-view/y1 LDZ2 #0008 ++ .Screen/y DEO2
	#03 .Screen/sprite DEO

	.octave-view/x1 LDZ2 .Screen/x DEO2
	.octave-view/y1 LDZ2 .Screen/y DEO2
	AUTO-YADDR
	.last-note LDZ STH
	;keys-left-icns STHkr #00 = INC ,draw-key JSR
	;keys-middle-icns STHkr #02 = INC ,draw-key JSR
	;keys-right-icns STHkr #04 = INC ,draw-key JSR
	;keys-left-icns STHkr #05 = INC ,draw-key JSR
	;keys-middle-icns STHkr #07 = INC ,draw-key JSR
	;keys-middle-icns STHkr #09 = INC ,draw-key JSR
	;keys-right-icns STHr #0b = INC ,draw-key JSR
	AUTO-NONE

RTN

@draw-key ( addr* color -- )
		
	STH
	.Screen/addr DEO2
	.Screen/y DEI2
	STHr .Screen/sprite DEOk DEOk DEO
	.Screen/x DEI2k #0008 ++ ROT DEO2
	.Screen/y DEO2

RTN

@draw-adsr ( -- )
	
	( adsr )
	.adsr-view/x1 LDZ2 .adsr-view/y1 LDZ2
		.Audio0/adsr DEI #04 SFT
		;draw-knob JSR2
	.adsr-view/x1 LDZ2 #0018 ++ .adsr-view/y1 LDZ2
		.Audio0/adsr DEI #0f AND
		;draw-knob JSR2
	.adsr-view/x1 LDZ2 #0030 ++ .adsr-view/y1 LDZ2
		.Audio0/adsr INC DEI #04 SFT
		;draw-knob JSR2
	.adsr-view/x1 LDZ2 #0048 ++ .adsr-view/y1 LDZ2
		.Audio0/adsr INC DEI #0f AND
		;draw-knob JSR2
	( volume )
	.adsr-view/x2 LDZ2 #0028 -- .adsr-view/y1 LDZ2
		.Audio0/volume DEI #04 SFT
		;draw-knob JSR2
	.adsr-view/x2 LDZ2 #0010 -- .adsr-view/y1 LDZ2
		.Audio0/volume DEI #0f AND
		;draw-knob JSR2

RTN

@draw-wave ( -- )
	
	( clear )
	.wave-view/x1 LDZ2
	.wave-view/y1 LDZ2
	.wave-view/x2 LDZ2 INC2
	.wave-view/y2 LDZ2
	#00 ;fill-rect JSR2

	#01 ;draw-wave-length JSR2

	.wave-view/x1 LDZ2 .Screen/x DEO2

	( waveform )
	#ff #00 
	&loop
		( dotted line )
		DUP #01 AND ,&no-dot JCN 
			.wave-view/y1 LDZ2 #0010 ++ .Screen/y DEO2
			#03 .Screen/pixel DEO
		&no-dot
		#00 OVR .Audio0/addr DEI2 ++ LDA 
		2/
		TOS 4// .wave-view/y1 LDZ2 ++ .Screen/y DEO2
		.Screen/x DEI2 INC2 .Screen/x DEO2
		( draw ) DUP 
			.Audio0/length DEI2 NIP > 
			.Audio0/length DEI2 #0100 !! #0101 == DUP ADD INC .Screen/pixel DEO
		INC GTHk ,&loop JCN
	POP2

	( range )
	AUTO-X
	.wave-view/x1 LDZ2 .Screen/x DEO2
	.wave-view/y1 LDZ2 #0010 -- .Screen/y DEO2
	.Audio0/addr DEI2 #02 ;draw-short JSR2
	.wave-view/x2 LDZ2 #0020 -- .Screen/x DEO2
	.Audio0/length DEI2 #02 ;draw-short JSR2
	AUTO-NONE

RTN

@draw-wave-length ( color -- )
	
	STH
	.wave-view/x1 LDZ2 .Audio0/length DEI2 ++ .Screen/x DEO2
	.wave-view/y1 LDZ2 DUP2 #0020 ++ SWP2
	&loop
		DUP2 .Screen/y DEO2
		( draw ) STHkr .Screen/pixel DEO
		INC2 GTH2k ,&loop JCN
	POP2 POP2
	POPr

RTN

@draw-knob ( x* y* value -- )

	( load ) STH .Screen/y DEO2  .Screen/x DEO2
	;knob-icns .Screen/addr DEO2 
		( draw ) #01 .Screen/sprite DEO
	.Screen/x DEI2 #0008 ++ .Screen/x DEO2 
	;knob-icns #0008 ++ .Screen/addr DEO2 
		( draw ) #01 .Screen/sprite DEO
	.Screen/y DEI2 #0008 ++ .Screen/y DEO2 
	;knob-icns #0018 ++ .Screen/addr DEO2 
		( draw ) #01 .Screen/sprite DEO
	.Screen/x DEI2 #0008 -- .Screen/x DEO2 
	;knob-icns #0010 ++ .Screen/addr DEO2 
		( draw ) #01 .Screen/sprite DEO
	.Screen/x DEI2 #0004 ++ .Screen/x DEO2
	.Screen/y DEI2 #0008 ++ .Screen/y DEO2
	;font-hex #00 STHkr #30 SFT ++ .Screen/addr DEO2
		( draw ) #01 .Screen/sprite DEO
	.Screen/x DEI2 #0004 -- #00 #00 STHkr ;knob-offsetx ++ LDA ++ .Screen/x DEO2
	.Screen/y DEI2 #0010 -- #00 #00 STHr ;knob-offsety ++ LDA ++ .Screen/y DEO2
	;knob-icns #0020 ++ .Screen/addr DEO2
		( draw ) #05 .Screen/sprite DEO

RTN

@draw-short ( short* color -- )

	STH 
	SWP STHkr ,draw-byte JSR 
	STHr 

@draw-byte ( byte color -- )

	STH 
	DUP #04 SFT STHkr ,draw-hex JSR #0f AND 
	STHr 

@draw-hex ( char color -- )

	SWP TOS 8** ;font-hex ++ .Screen/addr DEO2
	.Screen/sprite DEO

RTN

@fill-rect ( x1* y1* x2* y2* color -- )
	
	,&color STR
	( x1 x2 y1 y2 ) ROT2
	&ver
		( save ) DUP2 .Screen/y DEO2
		STH2 STH2 OVR2 OVR2 SWP2
		&hor
			( save ) DUP2 .Screen/x DEO2
			( draw ) ,&color LDR .Screen/pixel DEO
			( incr ) INC2
			OVR2 OVR2 GTS2 ,&hor JCN
		POP2 POP2 STH2r STH2r
		( incr ) INC2
		OVR2 OVR2 GTS2 ,&ver JCN
	POP2 POP2 POP2 POP2

RTN
	&color $1

@within-rect ( x* y* rect -- flag )
	
	STH
	( y < rect.y1 ) DUP2 STHkr #02 ADD LDZ2 LTH2 ,&skip JCN
	( y > rect.y2 ) DUP2 STHkr #06 ADD LDZ2 GTH2 ,&skip JCN
	SWP2
	( x < rect.x1 ) DUP2 STHkr LDZ2 LTH2 ,&skip JCN
	( x > rect.x2 ) DUP2 STHkr #04 ADD LDZ2 GTH2 ,&skip JCN
	POP2 POP2 POPr
	#01 
RTN
	&skip
	POP2 POP2 POPr
	#00

RTN

@cursor 
	80c0 e0f0 f8e0 1000 

@arrow-icns 
	0010 387c fe10 1000
	0010 1010 fe7c 3810 

@notes 
	30 32 34 35
	37 39 3b 3c

@keys-left-icns 
	7c7c 7c7c 7c7c 7c7c
	7c7c 7c7c 7c7c 7e7f
	7f7f 7f7f 7f7f 3e00 

@keys-middle-icns 
	1c1c 1c1c 1c1c 1c1c
	1c1c 1c1c 1c1c 3e7f
	7f7f 7f7f 7f7f 3e00 

@keys-right-icns 
	1f1f 1f1f 1f1f 1f1f
	1f1f 1f1f 1f1f 3f7f
	7f7f 7f7f 7f7f 3e00 

@knob-icns 
	0003 0c10 2020 4040
	00c0 3008 0404 0202
	4040 2020 100c 0300
	0202 0404 0830 c000
	0000 183c 3c18 0000 

@knob-offsetx 
	01 00 00 00 00 01 02 03
	05 06 07 08 08 08 08 07 

@knob-offsety 
	07 06 05 03 02 01 00 00
	00 00 01 02 03 05 06 07 

@font-hex ( 0-F )
	007c 8282 8282 827c 0030 1010 1010 1010
	007c 8202 7c80 80fe 007c 8202 1c02 827c
	000c 1424 4484 fe04 00fe 8080 7c02 827c
	007c 8280 fc82 827c 007c 8202 1e02 0202
	007c 8282 7c82 827c 007c 8282 7e02 827c
	007c 8202 7e82 827e 00fc 8282 fc82 82fc
	007c 8280 8080 827c 00fc 8282 8282 82fc
	007c 8280 f080 827c 007c 8280 f080 8080 

@sin-pcm
	8083 8689 8c8f 9295 989b 9ea1 a4a7 aaad
	b0b3 b6b9 bbbe c1c3 c6c9 cbce d0d2 d5d7
	d9db dee0 e2e4 e6e7 e9eb ecee f0f1 f2f4
	f5f6 f7f8 f9fa fbfb fcfd fdfe fefe fefe
	fffe fefe fefe fdfd fcfb fbfa f9f8 f7f6
	f5f4 f2f1 f0ee eceb e9e7 e6e4 e2e0 dedb
	d9d7 d5d2 d0ce cbc9 c6c3 c1be bbb9 b6b3
	b0ad aaa7 a4a1 9e9b 9895 928f 8c89 8683
	807d 7a77 7471 6e6b 6865 625f 5c59 5653
	504d 4a47 4542 3f3d 3a37 3532 302e 2b29
	2725 2220 1e1c 1a19 1715 1412 100f 0e0c
	0b0a 0908 0706 0505 0403 0302 0202 0202
	0102 0202 0202 0303 0405 0506 0708 090a
	0b0c 0e0f 1012 1415 1719 1a1c 1e20 2225
	2729 2b2e 3032 3537 3a3d 3f42 4547 4a4d
	5053 5659 5c5f 6265 686b 6e71 7477 7a7d