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main.asm
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;Here Be Dragons
;Slipstream 2022
;Released at NOVA 2022
;Code, Graphics and Music: TôBach
;Music: Nihilazo
;Graphics: Ando, RaccoonViolet
;made over the course of two months, powered by many thunderdome cd's and all-nighters :)
;notes:
;64x64 = 1024 bytes, start addr = $400, end addr = $800
;indirect fuckery cheese:
;with scroller load all text into one "string", inc scene once == 44, inc index, store away index, init value == 1
;when scroller needed again, restore index and continue scroller routine, clr init value
;scene order
;------------
;title screen
;scroller
;twister
;torus thing
;scroller
;11 colours thing
;scroller
;rotating sheep
;credits
org 20
;varzz go here
sceneval rmb 1
;twister vars
twistaddr rmb 2
twistindex rmb 2
;infoscrn vars
currchar rmb 2
;scene stuffs
scenetim rmb 2
px1 rmb 1
py1 rmb 1
;global varzzz
scnt rmb 1
vscnt rmb 1
vscnt2 rmb 1
xcnt rmb 1
ycnt rmb 1
;scroller vars
charaddr rmb 2
stringadd rmb 2
lettercnt rmb 1
letteraddcnt rmb 1
charindex rmb 2
currstring rmb 2
scrolltextval rmb 1
scrollpos rmb 2
;voxel sheep
sheepgfxaddr rmb 2
;credits/greets
creditsaddr rmb 2
;title
titlesrc rmb 2
titledst rmb 2
;multicolour
multiclraddrsrc rmb 2
multiclraddrdst rmb 2
;torus
torusgfxaddr rmb 2
org $1000
;main coedz
start
;lds #$3E00 ;set up stacks
;ldu #$3D00
orcc #$50
lda $ff23 ;set cassette output
ora #%00001000
sta $ff23
lda #%00111110 ;Bit 3=0 Bit0=Hsync
sta $ff01 ;Bit 3 CA2: Select Device (Multiplexor LSB)
lda #%00110111 ;Bit 3=0 Bit0=Vsync
sta $ff03 ;Bit 3 CB2: Select Device (Multiplexor MSB)
;new irq vector
lda #$7e ;hijack with jmp
sta $010c
ldx #irq_start ;point to our irq routine
stx $010d
andcc #$ef ;reenable interrupts
clr xcnt
clr ycnt
clr scnt
clr vscnt
clr vscnt2
clr sceneval
clr lettercnt
clr letteraddcnt
clr scrolltextval
lda #1
sta twistflag
sta infoflag
sta sg12flag
sta scrollflag1
sta sheepflag
sta creditsflag
sta sgcolflag
sta sineflag
sta titleflag
sta torusflag
ldy #$0000
sty twistindex
sty stringadd
sty charindex
sty scenetim
ldx #infostring
stx currchar
ldx #char_space
stx charaddr
ldx #sheepgfx
stx sheepgfxaddr
ldx #creditsgfx
stx creditsaddr
ldx #$480
stx stringadd
ldx #cygnetsong
stx titlesrc
ldx #sgcolimg
stx multiclraddrsrc
ldx #$400
stx titledst
stx multiclraddrdst
ldx #string
stx currstring
ldx #torusgfx
stx torusgfxaddr
lda #9
sta lettercnt
inc sceneval
;clr $ffd7 ;dangerous :)
;clr $ffd9 ;even more dangerous :)))
main
;do nothing until irq
jmp main
irq_start
lda $ff02 ;acknowledge interrupt
inc scnt
lda scnt
cmpa #50 ;1 second, current second stored in vscnt
bne skipsreset
lda #0
sta scnt
inc vscnt
skipsreset
;jmp scenecheckend
framecheck
;ldx vscnt
;stx $400
;lda sceneval
;sta $402
framecheckend
scenecheck
lda sceneval
cmpa #1
bne sskip1
jsr titlescreen
bra scenecheckend
sskip1
cmpa #2
bne sskip2
jsr scrollmain
bra scenecheckend
sskip2
cmpa #3
bne sskip3
jsr infoscrnmain
bra scenecheckend
sskip3
cmpa #4
bne sskip4
jsr infoscrnend
bra scenecheckend
sskip4
cmpa #5
bne sskip5
jsr scrollmain
bra scenecheckend
sskip5
cmpa #6
bne sskip6
jsr twistmain
bra scenecheckend
sskip6
cmpa #7
bne sskip7
jsr torusmain
bra scenecheckend
sskip7
cmpa #8
bne sskip8
jsr scrollmain
bra scenecheckend
sskip8
cmpa #9
bne sskip9
jsr multicolour
bra scenecheckend
sskip9
cmpa #10
bne sskip10
jsr scrollmain
bra scenecheckend
sskip10
cmpa #11
bne sskip11
jsr sheepmain
bra scenecheckend
sskip11
;jsr sheepmain
;jsr torusmain
jsr credits
scenecheckend
;jsr scrollmain
;jsr titlescreen
irq_end
;ldx vscnt
;stx $400
rti
DBGPAL macro ;check frame time
lda $ff22
eora #$18
sta $ff22
endm
;include all teh filezzz
include "init.asm"
include "titlescreen.asm"
include "twister.asm"
include "infoscreen.asm"
include "pmode.asm"
;include "sg12test.asm"
include "sgcol.asm"
include "scroll.asm"
include "torus.asm"
include "voxelsheep.asm"
include "credits.asm"
;less important vars - i know using a whole byte for a boolean is wasteful - i just cba bitmasking ;)
twistflag rmb 1
infoflag rmb 1
sg12flag rmb 1
scrollflag1 rmb 1
scnrbaseval rmb 1
sheepflag rmb 1
creditsflag rmb 1
sgcolflag rmb 1
sineflag rmb 1
titleflag rmb 1
torusflag rmb 1
end start