106 lines
2.2 KiB
Tal
106 lines
2.2 KiB
Tal
|00 @System &vector $2 &wst $1 &rst $1 &eaddr $2 &ecode $1 &pad $1 &r $2 &g $2 &b $2 &debug $1 &halt $1
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|20 @Screen &vector $2 &width $2 &height $2 &auto $1 &pad $1 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1
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|00
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@line &x2 $2 &y2 $2
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|0100
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#aff5 .System/r DEO2
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#af00 .System/g DEO2
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#af05 .System/b DEO2
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( screen size )
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#0140 .Screen/width DEO2
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#0140 .Screen/height DEO2
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#03ff #0000
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&l
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STH2k INC2k d2xy STH2r d2xy #01 draw-line
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INC2 GTH2k ?&l
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POP2 POP2
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BRK
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@d2xy ( d* -- x* y* )
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,&t STR2
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#0000
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DUP2 ,&x STR2
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,&y STR2
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( N ) #0020 #0001 ( for i=1; i<n; i*=2 )
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&l
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STH2k
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[ LIT2 &t $2 ]
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DUP2 #01 SFT2 #0001 AND2
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DUP2 ,&rx STR2
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EOR2 #0001 AND2 ,&ry STR2
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,&t LDR2 #02 SFT2 ,&t STR2
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[ LIT2 &x $2 ] [ LIT2 &y $2 ] [ LIT2 &rx $2 ] [ LIT2 &ry $2 ]
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STH2r rot ,&y STR2 ,&x STR2
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DUP2 ,&rx LDR2 MUL2 ,&x LDR2 ADD2 ,&x STR2
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DUP2 ,&ry LDR2 MUL2 ,&y LDR2 ADD2 ,&y STR2
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#10 SFT2 GTH2k ?&l
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POP2 POP2
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,&x LDR2 #30 SFT2 #0020 ADD2
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,&y LDR2 #30 SFT2 #0020 ADD2
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JMP2r
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@rot ( x* y* rx* ry* n* -- x* y* )
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( n-1 ) #0001 SUB2 STH2
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SWP2 ,&rx STR2
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#0000 NEQ2 ?&skipy
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[ LIT2 &rx $2 ] #0001 NEQ2 ?&skipx
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( rx-n-1 ) SWP2 STH2kr SWP2 SUB2
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( ry-n-1 ) SWP2 STH2kr SWP2 SUB2
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&skipx
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( swap ) SWP2
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&skipy
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POP2r
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JMP2r
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@draw-line ( x1* y1* x2* y2* color -- )
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( load )
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,&color STR
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,&y STR2
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,&x STR2
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.line/y2 STZ2
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.line/x2 STZ2
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,&x LDR2 .line/x2 LDZ2 SUB2 abs2 ,&dx STR2
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#0000 ,&y LDR2 .line/y2 LDZ2 SUB2 abs2 SUB2 ,&dy STR2
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#ffff #00 .line/x2 LDZ2 ,&x LDR2 lts2 DUP2 ADD2 ADD2 ,&sx STR2
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#ffff #00 .line/y2 LDZ2 ,&y LDR2 lts2 DUP2 ADD2 ADD2 ,&sy STR2
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[ LIT2 &dx $2 ] [ LIT2 &dy $2 ] ADD2 ,&e1 STR2
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&loop
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.line/x2 LDZ2 DUP2 .Screen/x DEO2 [ LIT2 &x $2 ] EQU2
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.line/y2 LDZ2 DUP2 .Screen/y DEO2 [ LIT2 &y $2 ] EQU2
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[ LIT2 &color $1 -Screen/pixel ] DEO
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AND ?&end
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[ LIT2 &e1 $2 ] DUP2 ADD2 DUP2
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,&dy LDR2 lts2 ?&skipy
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,&e1 LDR2 ,&dy LDR2 ADD2 ,&e1 STR2
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.line/x2 LDZ2 [ LIT2 &sx $2 ] ADD2 .line/x2 STZ2
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&skipy
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,&dx LDR2 gts2 ?&skipx
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,&e1 LDR2 ,&dx LDR2 ADD2 ,&e1 STR2
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.line/y2 LDZ2 [ LIT2 &sy $2 ] ADD2 .line/y2 STZ2
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&skipx
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!&loop
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&end
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JMP2r
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@abs2 DUP2 #0f SFT2 EQU #05 JCN #0000 SWP2 SUB2 JMP2r
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@lts2 #8000 STH2k ADD2 SWP2 STH2r ADD2 GTH2 JMP2r
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@gts2 #8000 STH2k ADD2 SWP2 STH2r ADD2 LTH2 JMP2r
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