( dev/audio )

%GET-NOTE { #00 SWP ;melody ADD2 LDA }
%GET-HEXCHAR  { #00 SWP #30 SFT2 ;font-hex ADD2 .Screen/addr DEO2 }

( devices )

|00 @System     [ &vector $2 &pad      $6 &r      $2 &g     $2 &b      $2 ]
|20 @Screen     [ &vector $2 &width    $2 &height $2 &pad   $2 &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 ]

( variables )

|0000

@timer     $1
@progress  $1
@selection $1
@offset
	&x $2 &y $2

|0100 ( -> )
	
	( theme )
	#0f8f .System/r DEO2 
	#0f8f .System/g DEO2 
	#0f80 .System/b DEO2 

	( vectors )
	;on-frame .Screen/vector DEO2
	;on-button .Controller/vector DEO2

	( setup synth )
	#0208 .Audio0/adsr DEO2
	;saw .Audio0/addr DEO2
	#0100 .Audio0/length DEO2
	#dd .Audio0/volume DEO ( TODO: turn ON )

	( center )
	.Screen/width DEI2 #01 SFT2 #0080 SUB2 .offset/x STZ2
	.Screen/height DEI2 #01 SFT2 #0040 SUB2 .offset/y STZ2

	;draw JSR2
	#02 ;draw-selector JSR2

BRK

@on-button ( -> )

	.Controller/button DEI #04 SFT
	[ #01 ] NEQk NIP ,&no-up JCN 
		.selection LDZ STHk 
		#00 ;draw-note JSR2
		[ STHkr GET-NOTE INC ] #00 STHkr ;melody ADD2 STA
		STHr #01 ;draw-note JSR2
		#02 ;draw-selector JSR2
		&no-up
	[ #02 ] NEQk NIP ,&no-down JCN 
		.selection LDZ STHk 
		#00 ;draw-note JSR2
		[ STHkr GET-NOTE #01 SUB ] #00 STHkr ;melody ADD2 STA
		STHr #01 ;draw-note JSR2
		#02 ;draw-selector JSR2
		&no-down
	[ #04 ] NEQk NIP ,&no-left JCN 
		#00 ;draw-selector JSR2
		.selection LDZ #01 SUB #1f AND .selection STZ
		#02 ;draw-selector JSR2
		&no-left
	[ #08 ] NEQk NIP ,&no-right JCN 
		#00 ;draw-selector JSR2
		.selection LDZ INC #1f AND .selection STZ
		#02 ;draw-selector JSR2
		&no-right
	POP
	
BRK

@on-frame ( -> )

	( incr ) .timer LDZ INC .timer STZ 
	( skip ) .timer LDZ #10 EQU #01 JCN [ BRK ]
	.progress LDZ 
	( play note )    DUP GET-NOTE .Audio0/pitch DEO
	( erase last )   DUP #01 SUB #1f AND #01 ,draw-note JSR
	( draw current ) #01 ,draw-note JSR
	( incr ) .progress LDZ INC #1f AND .progress STZ
	#00 .timer STZ

BRK

@draw ( -- )

	#20 #00
	&loop
		DUP #01 ,draw-note JSR
		INC GTHk ,&loop JCN
	POP2

JMP2r

@draw-note ( id color -- )

	STH STH
	( set x ) [ #00 STHkr ] #30 SFT2 .offset/x LDZ2 ADD2 .Screen/x DEO2
	( set y ) [ #00 #00 STHkr ;melody ADD2 LDA ] #20 SFT2 #0100 SWP2 SUB2 .offset/y LDZ2 ADD2 #0080 ADD2 .Screen/y DEO2
	( set addr ) ;marker-icn [ #00 .progress LDZ STHr EQU #08 MUL ADD2 ] .Screen/addr DEO2
	( draw ) STHr .Screen/sprite DEO

JMP2r

@draw-selector ( color -- )
	
	STH
	[ #00 .selection LDZ ] #30 SFT2 .offset/x LDZ2 ADD2 .Screen/x DEO2
	#0070 .offset/y LDZ2 ADD2 .Screen/y DEO2
	;selector-icn .Screen/addr DEO2
	STHkr .Screen/sprite DEO

	.Screen/y DEI2 #0008 ADD2 .Screen/y DEO2
	.selection LDZ GET-NOTE STHr ,draw-byte JSR

JMP2r

@draw-byte ( byte color -- )
	
	STH 
	DUP 
		#04 SFT GET-HEXCHAR 
		( draw ) STHkr .Screen/sprite DEO
	.Screen/x DEI2 #0008 ADD2 .Screen/x DEO2
		#0f AND GET-HEXCHAR 
		( draw ) STHr .Screen/sprite DEO

JMP2r

@melody 
	54 52 54 4f 4b 4f 48 ff
	54 52 54 4f 4b 4f 48 ff
	54 56 57 56 57 54 56 54 
	56 52 54 52 54 50 54 ff 

@selector-icn
	0000 0010 387c 0000

@marker-icn
	3844 8282 8244 3800
	387c fefe fe7c 3800

@saw 
	0003 0609 0c0f 1215 181b 1e21 2427 2a2d
	3033 3639 3b3e 4143 4649 4b4e 5052 5557
	595b 5e60 6264 6667 696b 6c6e 7071 7274
	7576 7778 797a 7b7b 7c7d 7d7e 7e7e 7e7e
	7f7e 7e7e 7e7e 7d7d 7c7b 7b7a 7978 7776
	7574 7271 706e 6c6b 6967 6664 6260 5e5b
	5957 5552 504e 4b49 4643 413e 3b39 3633
	302d 2a27 2421 1e1b 1815 120f 0c09 0603
	00fd faf7 f4f1 eeeb e8e5 e2df dcd9 d6d3
	d0cd cac7 c5c2 bfbd bab7 b5b2 b0ae aba9
	a7a5 a2a0 9e9c 9a99 9795 9492 908f 8e8c
	8b8a 8988 8786 8585 8483 8382 8282 8282
	8182 8282 8282 8383 8485 8586 8788 898a
	8b8c 8e8f 9092 9495 9799 9a9c 9ea0 a2a5
	a7a9 abae b0b2 b5b7 babd bfc2 c5c7 cacd
	d0d3 d6d9 dcdf e2e5 e8eb eef1 f4f7 fafd 

@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