( a simple calculator )

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

%2*   { #10 SFT } 
%4*   { #20 SFT } %4/ { #02 SFT }
%2**  { #10 SFT2 } %2// { #01 SFT2 }
%4**  { #20 SFT2 }
%8**  { #30 SFT2 } %8// { #03 SFT2 }
%10** { #40 SFT2 } %10// { #04 SFT2 }

%4MOD { #03 AND }

%DEBUG  { ;print-hex/byte JSR2 #0a .Console/write DEO }
%DEBUG2 { ;print-hex/short JSR2 #0a .Console/write DEO }

%RTN { JMP2r }
%SWP2? { #01 JCN SWP2 }
%BRK? { #01 JCN BRK }
%TOS { #00 SWP }

( 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 ]
|40 @Audio1     [ &vector $2 &position $2 &output $1 &pad   $3 &adsr   $2 &length $2 &addr $2 &volume $1 &pitch $1 ]
|50 @Audio2     [ &vector $2 &position $2 &output $1 &pad   $3 &adsr   $2 &length $2 &addr $2 &volume $1 &pitch $1 ]
|60 @Audio3     [ &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 &wheel  $1 ]
|a0 @File       [ &vector $2 &success  $2 &offset-hs $2 &offset-ls $2 &name   $2 &length $2 &load $2 &save   $2 ]
|b0 @DateTime   [ &year   $2 &month    $1 &day    $1 &hour  $1 &minute $1 &second $1 &dotw $1 &doty   $2 &isdst $1 ]

( variables )

|0000

@input
	&length $1 &value $2
@stack
	&length $1
	&items $10
@center
	&x $2 &y $2
@rect
	&x1 $2 &y1 $2 &x2 $2 &y2 $2
@pointer
	&x  $2 &y  $2 &lastx $2 &lasty $2 &state $1
@keypad-frame
	&x $2 &y $2 &x2 $2 &y2 $2
@modpad-frame
	&x $2 &y $2 &x2 $2 &y2 $2
@input-frame
	&x $2 &y $2 &x2 $2 &y2 $2

( program )

|0100 ( -> )

	( theme ) 
	#0fef .System/r DEO2 
	#0fc5 .System/g DEO2 
	#0f25 .System/b DEO2

	#0120 .Screen/width DEO2
	#0160 .Screen/height DEO2

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

	.center/x LDZ2 #0028 -- 
	DUP2 .keypad-frame/x STZ2
		#0040 ++ .keypad-frame/x2 STZ2
	.center/y LDZ2 #0020 -- 
	DUP2 .keypad-frame/y STZ2
		#0040 ++ .keypad-frame/y2 STZ2

	.keypad-frame/x LDZ2 #0040 ++ 
	DUP2 .modpad-frame/x STZ2
		#0010 ++ .modpad-frame/x2 STZ2
	.keypad-frame/y LDZ2 
	DUP2 .modpad-frame/y STZ2
		#0040 ++ .modpad-frame/y2 STZ2

	.center/x LDZ2 #0010 -- 
	DUP2 .input-frame/x STZ2
		#0040 ++ .input-frame/x2 STZ2
	.center/y LDZ2 #0030 -- 
	DUP2 .input-frame/y STZ2
		#0010 ++ .input-frame/y2 STZ2

	;on-mouse .Mouse/vector DEO2

	;redraw JSR2

BRK

@on-mouse ( -> )

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

	( record pointer positions )
	.Mouse/x DEI2 .pointer/x STZ2 
	.Mouse/y DEI2 .pointer/y STZ2

	( draw new cursor )
	.pointer/x LDZ2 .Screen/x DEO2
	.pointer/y LDZ2 .Screen/y DEO2
	#41 .Mouse/state DEI #01 = + .Screen/sprite DEO

	.Mouse/state DEI BRK?

	.Mouse/x DEI2 .Mouse/y DEI2 
	OVR2 OVR2 .keypad-frame 
		;within-rect JSR2 ;click-keypad JCN2
	OVR2 OVR2 .input-frame 
		;within-rect JSR2 ;click-input JCN2
	OVR2 OVR2 .modpad-frame 
		;within-rect JSR2 ;click-modpad JCN2
	POP2 POP2

BRK

@click-keypad ( x* y* -> )

	( get key )
	.keypad-frame/y LDZ2 -- 10// 4**
	SWP2 .keypad-frame/x LDZ2 -- 10// #0003 AND2
	++ ;keypad/layout ++ LDA ;push-key JSR2

	( release mouse ) #00 .Mouse/state DEO

BRK

@click-modpad ( x* y* -> )

	NIP2
	( get key )
	.modpad-frame/y LDZ2 -- 10// NIP
	DUP #00 ! ,&no-add JCN
		;pop JSR2
		;pop JSR2
		ADD2 ;push JSR2
		&no-add
	POP

	( release mouse ) #00 .Mouse/state DEO

BRK

@click-input ( x* y* -> )

	POP2
	.input-frame/x LDZ2 #0008 ++ -- 10// NIP
	DUP #01 ! ,&no-push JCN
		.input/value LDZ2 #0001 << ,&no-push-empty JCN
			.input/value LDZ2 ;push JSR2
			&no-push-empty
		&no-push
	DUP #02 ! ,&no-pop JCN
		.stack/length LDZ #01 < ,&no-pop-empty JCN
			;pop JSR2 POP2
			&no-pop-empty
		&no-pop
	POP

	( release mouse ) #00 .Mouse/state DEO

BRK

@push-key ( key -- )

	TOS .input/value LDZ2 #40 SFT2 ++ .input/value STZ2
	.input/length LDZ INC .input/length STZ
	;draw-input JSR2

RTN

@push ( value* -- )

	( store ) .stack/length LDZ 2* .stack/items + STZ2
	( incr ) .stack/length LDZ INC .stack/length STZ
	( reset ) #0000 .input/value STZ2
	;draw-input JSR2
	;draw-stack JSR2

RTN

@pop ( -- value* )

	.stack/length LDZ #01 - 2* .stack/items + LDZ2
	( clear ) #0000 .stack/length LDZ #01 - 2* .stack/items + STZ2
	( incr ) .stack/length LDZ #01 - .stack/length STZ
	;draw-input JSR2
	;draw-stack JSR2

RTN

@redraw ( -- )

	;draw-keypad JSR2
	;draw-modpad JSR2
	;draw-input JSR2
	;draw-stack JSR2

RTN

@draw-stack ( -- )

	#08 #00
	&loop
		( color ) DUP .stack/length LDZ < STH
		( value ) DUP 2* .stack/items + LDZ2 STH2
		( y ) DUP TOS 8** #0070 SWP2 -- STH2
		( x ) #0088 STH2r STH2r STHr ;draw-short JSR2
		INC GTHk ,&loop JCN
	POP2

RTN

@draw-short ( x* y* value* color -- )

	STH STH2
	.Screen/y DEO2
	.Screen/x DEO2
	#04 #00
	&loop
		.Screen/x DEI2 #0008 -- .Screen/x DEO2
		( value ) DUP STH2kr ROT 4* SFT2 #000f AND2
		( value glyph ) 8** ;font-hex ++ .Screen/addr DEO2
		ROTr STHkr ROTr ROTr .Screen/sprite DEO
		INC GTHk ,&loop JCN
	POP2
	POP2r POPr

RTN

@draw-input ( -- )

	.input-frame/y LDZ2 #0002 ++ .Screen/y DEO2
	#04 #00
	&loop
		( x ) DUP TOS 8** .input-frame/x LDZ2 SWP2 -- .Screen/x DEO2
		( value ) STHk .input/value LDZ2 STHr 4* SFT2 #000f AND2
		( value glyph ) 8** ;font-hex ++ .Screen/addr DEO2
		( color ) DUP INC .input/value LDZ2 ;get-length JSR2 >
		#01 + .Screen/sprite DEO
		INC GTHk ,&loop JCN
	POP2

	( controls )
	.input-frame/x LDZ2 #0018 ++
	.input-frame/y LDZ2
	;stack-icns/push 
	;key-icns/outline #01
		;draw-key JSR2

	.input-frame/x LDZ2 #0028 ++
	.input-frame/y LDZ2
	;stack-icns/pop 
	;key-icns/outline #02
		;draw-key JSR2

RTN

@get-length ( short* -- length )

	DUP2 #0fff << ,&no4 JCN POP2 #04 RTN &no4
	DUP2 #00ff << ,&no3 JCN POP2 #03 RTN &no3
	DUP2 #000f << ,&no2 JCN POP2 #02 RTN &no2
	#0000 !!

RTN

@draw-keypad ( -- )

	#10 #00
	&loop
		( color ) DUP TOS ;keypad/color ++ LDA STH
		( layout ) DUP TOS ;keypad/layout ++ LDA 
			( layout addr ) TOS 8** ;font-hex ++ STH2
		( x ) DUP 4MOD TOS 10** STH2
		( y ) DUP 4/ TOS 10**
		( origin-x ) STH2r .keypad-frame/x LDZ2 ++ SWP2 
		( origin-y ) .keypad-frame/y LDZ2 ++
			STH2r ;key-icns/full STHr ;draw-key JSR2
		INC GTHk ,&loop JCN
	POP2

RTN

@draw-modpad ( -- )

	#04 #00
	&loop
		( color ) DUP TOS ;modpad/color ++ LDA STH
		( layout ) DUP TOS 8** ;mod-icns ++ STH2
		( x ) #0000 STH2
		( y ) DUP TOS 10**
		( origin-x ) STH2r .modpad-frame/x LDZ2 ++ SWP2 
		( origin-y ) .modpad-frame/y LDZ2 ++
			STH2r ;key-icns/full STHr ;draw-key JSR2
		INC GTHk ,&loop JCN
	POP2

RTN

@draw-key ( x* y* glyph* style* color -- )

	( auto x addr ) #05 .Screen/auto DEO
	( frame )
	STH 
	( style ) .Screen/addr DEO2 
	STH2 ROTr
	.Screen/y DEO2
	.Screen/x DEO2
	STHkr .Screen/sprite DEO
	STHkr .Screen/sprite DEO
	.Screen/x DEI2 #0010 -- .Screen/x DEO2
	.Screen/y DEI2 #0008 ++ .Screen/y DEO2
	STHkr .Screen/sprite DEO
	STHkr .Screen/sprite DEO
	( glyph )
	ROTr ROTr STH2r .Screen/addr DEO2
	.Screen/x DEI2 #000c -- .Screen/x DEO2
	.Screen/y DEI2 #0005 -- .Screen/y DEO2
	STHr #04 MUL  .Screen/sprite DEO
	( auto none ) #00 .Screen/auto DEO

RTN

@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

@line-rect ( rect color -- )

	STH STH
	( y2 ) STHkr #06 + LDZ2
	( y1 ) STHkr #02 + LDZ2 #0001 -- ( flip sign ) GTH2k SWP2?
	&ver
		( save ) DUP2 .Screen/y DEO2
		( x1 ) STHkr LDZ2 #0001 -- .Screen/x DEO2 
		OVRr STHr .Screen/pixel DEO
		( x2 ) STHkr #04 + LDZ2 .Screen/x DEO2 
		OVRr STHr .Screen/pixel DEO
		( incr )
		INC2 GTH2k ,&ver JCN
	POP2
	( x2 ) STHkr #04 + LDZ2
	( x1 ) STHkr LDZ2 #0001 -- ( flip sign ) GTH2k SWP2?
	&hor
		( save ) DUP2 .Screen/x DEO2
		( y1 ) STHkr #02 + LDZ2 #0001 -- .Screen/y DEO2 
		OVRr STHr .Screen/pixel DEO
		( y2 ) STHkr #06 + LDZ2 .Screen/y DEO2 
		OVRr STHr .Screen/pixel DEO
		( incr )
		INC2 GTH2k ,&hor JCN
	POP2
	POPr 
	.Screen/x DEO2
	.Screen/y DEO2 
	STHr .Screen/pixel DEO

RTN

@print-hex ( value* -- )
	
	&short ( value* -- )
		SWP ,&echo JSR 
	&byte ( value -- )
		,&echo JSR
	RTN

	&echo ( value -- )
	STHk #04 SFT ,&parse JSR .Console/write DEO
	STHr #0f AND ,&parse JSR .Console/write DEO
	RTN
	&parse ( value -- char )
		DUP #09 GTH ,&above JCN #30 + RTN &above #09 - #60 + RTN

RTN

@keypad
	&layout
		0708 090f
		0405 060e
		0102 030d
		000a 0b0c
	&color
		0101 0102
		0101 0102
		0101 0102
		0102 0202

@modpad
	&color
		0303 0303
		0303 0303

@font-hex
	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

@mod-icns
	0010 1010 fe10 1010
	0000 0000 fe00 0000
	0010 5428 c628 5410
	0010 0000 fe00 0010

@key-icns
	&full
		3f7f ffff ffff ffff
		f8fc fefe fefe fefe
		ffff ffff ff7f 3f00
		fefe fefe fefc f800
	&outline
		3f40 8080 8080 8080
		f804 0202 0202 0202
		8080 8080 8040 3f00
		0202 0202 0204 f800

@stack-icns
	&push
		ffff ffef d7bb ffff
	&pop
		ffff efc7 83c7 efff

@input-icn
	3f40 8080 8080 8080
	ff00 0000 0000 0000
	ff00 0000 0000 0000
	f804 0202 0202 0202
	8080 8080 8040 3f00
	0000 0000 0000 ff00
	0000 0000 0000 ff00
	0202 0202 0204 f800

@pointer-icn
	80c0 e0f0 f8e0 1000