mirror of https://git.sr.ht/~rabbits/uxn
237 lines
5.4 KiB
Tal
237 lines
5.4 KiB
Tal
(
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100r animated logo splash screen
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by Andrew Alderwick, 2021
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based on artwork by Hundred Rabbits
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)
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( devices )
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|00 @System [ &vector $2 &wst $1 &rst $1 &pad $4 &r $2 &g $2 &b $2 &debug $1 &halt $1 ]
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|20 @Screen [ &vector $2 &width $2 &height $2 &pad $2 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1 ]
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|c0 @DateTime [ &year $2 &month $1 &day $1 &hour $1 &minute $1 &second $1 &dotw $1 &doty $2 &isdst $1 ]
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( variables )
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|0000
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( program )
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|0100 @Reset ( -> )
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( seed prng (must be nonzero) )
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#00 .DateTime/second DEI
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#00 .DateTime/minute DEI #60 SFT2 EOR2
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#00 .DateTime/hour DEI #c0 SFT2 EOR2 ;prng/x STA2
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#00 .DateTime/hour DEI #04 SFT2
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#00 .DateTime/day DEI DUP2 ADD2 EOR2
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#00 .DateTime/month DEI #60 SFT2 EOR2
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.DateTime/year DEI2 #a0 SFT2 EOR2 ;prng/y STA2
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;prng/x LDA2 ;prng/y LDA2 EOR2
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;rabbits STH2 #0f05 &loop-x
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#0f05 &loop-y
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ROTk SWP STH2kr STA2 POP
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INC2r INC2r
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INC
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GTHk ,&loop-y JCN
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POP2
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INC
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GTHk ,&loop-x JCN
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POP2 POP2r
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( fall through )
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@repeat
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;init-occupancy JSR2
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#00 ;precalc-frame STA
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;precalculate-vector .Screen/vector DEO2
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BRK
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@init-occupancy ( -- )
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#1400 &loop-y
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#1400 &loop-x
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ROTk #00 ;set-occupied JSR2 POP
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INC
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GTHk ,&loop-x JCN
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POP2
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INC
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GTHk ,&loop-y JCN
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POP2
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;rabbits
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DUP2 #00c8 ADD2 SWP2 &loop-rabbits
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LDA2k #01 ;set-occupied JSR2
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INC2 INC2
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GTH2k ,&loop-rabbits JCN
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POP2 POP2
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JMP2r
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@precalculate-vector ( -> )
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,precalculate JSR BRK
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@precalculate ( -- )
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;rabbits #00c8 OVR ,precalc-frame LDR MUL2 ADD2 ( first rabbit address )
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DUP2 #00c8 ADD2 SWP2 &loop-rabbits
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DUP2 ,move-rabbit JSR
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INC2 INC2
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GTH2k ,&loop-rabbits JCN
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POP2 POP2
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,precalc-frame LDR INC DUP ,precalc-frame STR
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#05 EQU JMP JMP2r
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;display-init JSR2
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;display .Screen/vector DEO2
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JMP2r
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@precalc-frame $1
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@set-occupied ( x y value -- )
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STH
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#00 SWP #0014 MUL2 ( x yoffset* / value )
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ROT #00 SWP ADD2 ( offset* / value )
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;occupied ADD2 STH2 STAr
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JMP2r
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@move-rabbit ( addr* -- )
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STH2k LDA2 ( x y / addr* )
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DUP2 #00 ,set-occupied JSR
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;&possible-moves ( x y possible* / addr* )
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OVR2 #01 SUB ,&check-move JSR ( up )
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OVR2 INC INC ,&check-move JSR ( down )
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OVR2 #0100 SUB2 ,&check-move JSR ( left )
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OVR2 #0100 ADD2 ,&check-move JSR ( right )
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;&possible-moves SUB2 ( x y num-possible-times-2* / addr* )
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DUP ,&can-move JCN
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POP2
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&write ( x y / addr* )
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DUP2 #01 ,set-occupied JSR
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STH2r #00c8 ADD2 STA2
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JMP2r
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&can-move ( x y num-possible-times-2* / addr* )
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NIP2 ( num-possible-times-2* / addr* )
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,prng JSR SWP2 DIV2k MUL2 SUB2 #fe AND ( chosen-move* / addr* )
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;&possible-moves ADD2 LDA2
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,&write JMP
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&check-move ( possible* new-x new-y -- possible'* )
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DUP2 ,get-occupied JSR ,&blocked JCN
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OVR2r LIT2r 00c8 SUB2r ( possible* new-x new-y / previous-frame-addr* )
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&check-history-loop
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;rabbits INC2 STH2kr GTH2 ,&history-okay JCN
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DUP2 STH2kr LDA2 EQU2 ,&history-clash JCN
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LIT2r 00c8 SUB2r
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,&check-history-loop JMP
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&history-okay
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POP2r
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OVR2 STA2 INC2 INC2
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JMP2r
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&history-clash ( possible* new-x new-y / previous-frame-addr* )
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POP2r
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&blocked ( possible* new-x new-y )
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POP2
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JMP2r
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&possible-moves $10
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@get-occupied ( x y -- value )
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#00 SWP #0014 MUL2 ( x yoffset* )
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ROT #00 SWP ADD2 ( offset* )
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;occupied ADD2 LDA
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JMP2r
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@prng ( -- number* )
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LIT2 &x $2
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DUP2 #50 SFT2 EOR2
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DUP2 #03 SFT2 EOR2
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LIT2 &y $2 DUP2 ,&x STR2
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DUP2 #01 SFT2 EOR2 EOR2
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,&y STR2k POP
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JMP2r
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@display-init ( -- )
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.Screen/width DEI2 #01 SFT2 #0050 SUB2 ;display-rabbit/xoffset STA2
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.Screen/height DEI2 #01 SFT2 #0050 SUB2 ;display-rabbit/yoffset STA2
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;rabbit-sprite .Screen/addr DEO2
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JMP2r
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@display-rabbit ( color n counter -- )
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OVR LTHk ,&finish JCN
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SUB ( color n timeline )
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DUP #63 GTH ,&start JCN
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#17 DIVk STHk MUL SUB ( color n stage-timeline / frame )
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DUP #07 GTH ,&static JCN
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( rabbit is in-between two frames )
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#08 OVR SUB ,&from-weight STR
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,&to-weight STR ( color n / frame )
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#00 SWP DUP2 ADD2 ;rabbits ADD2 #00c8 #00 STHr MUL2 ADD2 ( color from-addr* )
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LDA2k STH2 #00c8 ADD2 LDA2
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&draw ( color to-x to-y / from-x from-y )
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STHr ,&mix JSR LIT2 &yoffset $2 ADD2 .Screen/y DEO2
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STHr ,&mix JSR LIT2 &xoffset $2 ADD2 .Screen/x DEO2
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.Screen/sprite DEO
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JMP2r
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&mix ( to-z from-z -- mixed* )
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#00 SWP LIT2 00 &from-weight 00 MUL2 ( to-n from-mixed* )
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ROT #00 SWP LIT2 00 &to-weight 00 MUL2 ADD2
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JMP2r
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&finish ( color n counter n )
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POP
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LITr ff ,&static JMP
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&start ( color n counter )
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LITr 04
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&static ( color n counter / frame )
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INCr
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POP
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#00 SWP DUP2 ADD2 ;rabbits ADD2 #00c8 #00 STHr MUL2 ADD2
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LDA2 STH2k
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,&draw JMP
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@display-counter $1
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@display ( -> )
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,display-counter LDR #01 SUB DUP ,display-counter STR
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DUP #f0 LTH ,&skip-palette JCN
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#ff OVR SUB #00
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DUP2 .System/r DEO2
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DUP2 .System/g DEO2
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.System/b DEO2
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&skip-palette
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INCk #0000 &clear-loop
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ROTk ;display-rabbit JSR2
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INC
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DUP #64 LTH ,&clear-loop JCN
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POP2 POP
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#0500 &draw-loop
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ROTk ;display-rabbit JSR2
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INC
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DUP #64 LTH ,&draw-loop JCN
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POP2
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,&no-finish JCN
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;sunset .Screen/vector DEO2
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&no-finish
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BRK
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@sunset ( -> )
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;display-counter LDA #02 SUB DUP ;display-counter STA
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DUP #1f GTH ,&skip-palette JCN
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DUP #01 SFT #00
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DUP2 .System/r DEO2
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DUP2 .System/g DEO2
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.System/b DEO2
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#6400 &draw-loop
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#05 OVR #00 ;display-rabbit JSR2
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INC
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GTHk ,&draw-loop JCN
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POP2
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&skip-palette
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,&no-finish JCN
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;repeat JMP2
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&no-finish
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BRK
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@rabbit-sprite 003c 7e7e 7e7e 3c00
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@occupied $190
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@rabbits
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