64 lines
1.1 KiB
Plaintext
64 lines
1.1 KiB
Plaintext
( devices )
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|00 @System [ &vector $2 &pad $6 &r $2 &g $2 &b $2 ]
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|20 @Screen [ &vector $2 &width $2 &height $2 &pad $2 &x $2 &y $2 &addr $2 &color $1 ]
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( variables )
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|0000
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@scroll [ &x $2 &y $2 &wait $1 ]
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|0100 ( -> )
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#90ff .System/r DEO2 #9000 .System/g DEO2 #900f .System/b DEO2
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#08e0 .Screen/width DEI2 #0001 SFT2 SUB2 .scroll/x STZ2
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#09b0 .scroll/y STZ2
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;frame .Screen/vector DEO2
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#30 .scroll/wait STZ
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BRK
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@frame ( -> )
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#ffff
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&loop
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DUP2 ,row JSR
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#0001 ADD2
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DUP2 .Screen/height DEI2 LTH2 ,&loop JCN
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POP2
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.scroll/wait LDZ ,&noscroll JCN
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.scroll/y LDZ2 #0001 ADD2 .scroll/y STZ2
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BRK
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&noscroll
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.scroll/wait LDZ #01 SUB .scroll/wait STZ
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BRK
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@row ( y* -- )
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DUP2 .Screen/y DEO2
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.scroll/y LDZ2 ADD2
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.Screen/width DEI2
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&loop
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#0001 SUB2
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OVR2 OVR2 .scroll/x LDZ2 ADD2 EOR2 DUP2 #0013 DIV2 #0013 MUL2 SUB2
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DUP #00 EQU ,&draw JCN
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DUP #05 EQU ,&draw JCN
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POP2
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&rest
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DUP2 ORA ,&loop JCN
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POP2 POP2
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JMP2r
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#15 .Screen/color DEO
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JMP2r
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&draw
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OVR2 .Screen/x DEO2
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#05 ADD .Screen/color DEO
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.Screen/y DEI2
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DUP2 #0001 ADD2 .Screen/y DEO2
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#00 .Screen/color DEO
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.Screen/y DEO2
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POP
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,&rest JMP
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