mirror of
https://github.com/blondie7575/GSCats.git
synced 2024-06-24 09:29:29 +00:00
167 lines
2.2 KiB
ArmAsm
167 lines
2.2 KiB
ArmAsm
;
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; gscats
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;
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; Created by Quinn Dunki on 7/9/17
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;
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.include "macros.s"
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.include "equates.s"
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.include "loader.s"
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mainBank2:
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SYNCDBR
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BITS8
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lda #$f0
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sta TEXTCOLOR
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BITS16
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; Set up SCBs
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jsr initSCBs
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SHRVIDEO
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lda #basePalette
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sta PARAML0
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lda #0
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jsr setPalette
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ldx #$2222
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jsr colorFill
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; jsr generateTerrain
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jsr compileTerrain
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jsr clipTerrain
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jsr unclipTerrain
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jsr clipTerrain
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mainGameLoop:
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; jsr syncVBL
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; lda scrollV
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; bmi negV
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; clc
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; lda mapScrollPos
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; adc scrollV
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; cmp #TERRAINWIDTH/4-80
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; beq reverseScroll
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; sta mapScrollPos
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bra render
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negV:
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clc
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lda mapScrollPos
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adc scrollV
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beq reverseScroll
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sta mapScrollPos
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render:
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tay
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jsr renderTerrain
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jsr kbdScan
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lda mapScrollRequested
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bne scrollMap
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lda quitRequested
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beq mainGameLoop
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CLASSICVIDEO
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jml (proDOSLongJump)
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scrollMap:
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jsr unclipTerrain
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sta mapScrollPos
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jsr clipTerrain
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stz mapScrollRequested
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jmp mainGameLoop
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reverseScroll:
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lda scrollV
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eor #$ffff
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inc
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sta scrollV
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jmp mainGameLoop
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scrollV:
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.word 1
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; kbdScan
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; Processes keyboard input
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;
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; Trashes A
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;
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kbdScan:
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EMULATION
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kbdScanLoop:
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lda KBD
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bpl kbdScanDone
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sta KBDSTROBE
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cmp #(8 + $80)
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beq kbdScanLeftArrow
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cmp #(21 + $80)
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beq kbdScanRightArrow
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cmp #(32 + $80)
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beq kbdScanSpace
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kbdScanDone:
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NATIVE
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rts
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kbdScanLeftArrow:
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NATIVE
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lda mapScrollPos
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cmp #TERRAINWIDTH/4-80
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beq kbdScanDone
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inc
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sta mapScrollRequested
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bra kbdScanDone
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kbdScanRightArrow:
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NATIVE
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lda mapScrollPos
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beq kbdScanDone
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dec
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sta mapScrollRequested
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bra kbdScanDone
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kbdScanSpace:
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NATIVE
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lda #1
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sta quitRequested
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bra kbdScanDone
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basePalette:
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.word $0800,$0080,$0000,$000F,$0FFF,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
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mapScrollPos: ; 4-pixel columns distance from right terrain edge
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.word 5
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quitRequested:
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.word $0000
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mapScrollRequested:
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.word $0000
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.include "graphics.s"
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.include "terrain.s"
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.include "tables.s"
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endMainBank2:
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; Suppress some linker warnings - Must be the last thing in the file
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; This is because Quinn doesn't really know how to use ca65 properly
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.SEGMENT "ZPSAVE"
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.SEGMENT "EXEHDR"
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.SEGMENT "STARTUP"
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.SEGMENT "INIT"
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.SEGMENT "LOWCODE"
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