mirror of https://git.sr.ht/~rabbits/uxn
119 lines
2.1 KiB
Tal
119 lines
2.1 KiB
Tal
( Project by Alex Schroeder - https://alexschroeder.ch )
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%RTN { JMP2r }
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%INCR { SWP #01 ADD SWP }
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%CELL { #1000 }
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%NEXT { #2000 }
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( 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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|b0 @DateTime [ &year $2 &month $1 &day $1 &hour $1 &minute $1 &second $1 &dotw $1 &doty $2 &isdst $1 ]
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|0000
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( program )
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@seed [ &x $1 &w $2 &s $2 ]
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|0100 ( -> )
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( theme )
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#2aac .System/r DEO2
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#269b .System/g DEO2
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#378d .System/b DEO2
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;seed-line JSR2
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( run for a few generations )
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#00 #ff
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&loop
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OVR #00 SWP ;print-line JSR2
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;compute-next JSR2
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;copy-next JSR2
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( incr ) INCR
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( loop ) LTHk ,&loop JCN
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POP2
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BRK
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@print-line ( y -- )
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( set ) .Screen/y DEO2
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( loop through cells )
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#00 #ff
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&loop
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( copy ) OVR #00 SWP DUP2
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( pos ) .Screen/x DEO2
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( addr ) CELL ADD2
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( draw ) LDA .Screen/color DEO
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( incr ) INCR
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( loop ) LTHk ,&loop JCN
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POP2
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RTN
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@compute-next ( -- )
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( loop through 62 cells )
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#01 #fe
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&loop
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OVR DUP DUP ( three copies of the counter )
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#01 SUB #00 SWP CELL ADD2 LDA
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SWP
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#01 ADD #00 SWP CELL ADD2 LDA
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( the cell dies if the neighbors are either both dead or both alive, i.e. Rule 90 )
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NEQ
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( one copy of the counter and the life value )
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SWP #00 SWP NEXT ADD2 STA
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( incr ) INCR
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( loop ) LTHk ,&loop JCN
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POP2
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RTN
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@copy-next ( -- )
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( loop through cells )
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#00 #ff
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&loop
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OVR DUP ( two copies of the counter )
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#00 SWP NEXT ADD2 LDA ( one copy of the counter and the value )
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SWP #00 SWP CELL ADD2 STA
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( incr ) INCR
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( loop ) LTHk ,&loop JCN
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POP2
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RTN
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@seed-line ( -- )
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.DateTime/second DEI .seed/x STZ
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#0000 .seed/w STZ2
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#e2a9 .seed/s STZ2
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( loop through cells )
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#01 #fe
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&loop
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OVR ( one copy of the counter )
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;rand JSR2
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#10 AND ( pick a bit )
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SWP #00 SWP CELL ADD2 STA
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( incr ) INCR
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( loop ) LTHk ,&loop JCN
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POP2
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RTN
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( https://en.wikipedia.org/wiki/Middle-square_method )
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@rand ( -- 1 )
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.seed/x LDZ #00 SWP DUP2 MUL2
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.seed/w LDZ2 .seed/s LDZ2 ADD2
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DUP2 .seed/w STZ2
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ADD2
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#04 SFT SWP #40 SFT ADD
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DUP .seed/x STZ
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RTN |