Hier ist der Code:
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Code
dcb "INIT"
RTL
dcb "MAIN"
JSR Graphics
RTL
TILEMAP: dcb $A2,$A4
Graphics:
JSR GET_DRAW_INFO
LDA $00
STA $0300,y
LDA $01
STA $0301,y
PHX
LDA $13
LSR
LSR
LSR
AND #$01
TAX
LDA TILEMAP,x
STA $0302,y
PLX
LDA #%00111011
ORA $64
STA $0303,y
INY
INY
INY
INY
LDY #$02
LDA #$00
JSL $01B7B3
RTS
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; GET_DRAW_INFO
; This is a helper for the graphics routine. It sets off screen flags, and sets up
; variables. It will return with the following:
;
; Y = index to sprite OAM ($300)
; $00 = sprite x position relative to screen boarder
; $01 = sprite y position relative to screen boarder
;
; It is adapted from the subroutine at $03B760
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
SPR_T1 dcb $0C,$1C
SPR_T2 dcb $01,$02
GET_DRAW_INFO STZ $186C,x ; reset sprite offscreen flag, vertical
STZ $15A0,x ; reset sprite offscreen flag, horizontal
LDA $E4,x ; \
CMP $1A ; | set horizontal offscreen if necessary
LDA $14E0,x ; |
SBC $1B ; |
BEQ ON_SCREEN_X ; |
INC $15A0,x ; /
ON_SCREEN_X LDA $14E0,x ; \
XBA ; |
LDA $E4,x ; |
REP #$20 ; |
SEC ; |
SBC $1A ; | mark sprite invalid if far enough off screen
CLC ; |
ADC.W #$0040 ; |
CMP.W #$0180 ; |
SEP #$20 ; |
ROL A ; |
AND #$01 ; |
STA $15C4,x ; /
BNE INVALID ;
LDY #$00 ; \ set up loop:
LDA $1662,x ; |
AND #$20 ; | if not smushed (1662 & 0x20), go through loop twice
BEQ ON_SCREEN_LOOP ; | else, go through loop once
INY ; /
ON_SCREEN_LOOP LDA $D8,x ; \
CLC ; | set vertical offscreen if necessary
ADC SPR_T1,y ; |
PHP ; |
CMP $1C ; | (vert screen boundry)
ROL $00 ; |
PLP ; |
LDA $14D4,x ; |
ADC #$00 ; |
LSR $00 ; |
SBC $1D ; |
BEQ ON_SCREEN_Y ; |
LDA $186C,x ; | (vert offscreen)
ORA SPR_T2,y ; |
STA $186C,x ; |
ON_SCREEN_Y DEY ; |
BPL ON_SCREEN_LOOP ; /
LDY $15EA,x ; get offset to sprite OAM
LDA $E4,x ; \
SEC ; |
SBC $1A ; | $00 = sprite x position relative to screen boarder
STA $00 ; /
LDA $D8,x ; \
SEC ; |
SBC $1C ; | $01 = sprite y position relative to screen boarder
STA $01 ; /
RTS ; return
INVALID PLA ; \ return from *main gfx routine* subroutine...
PLA ; | ...(not just this subroutine)
RTS ; /
Und hier ist die CFG-Datei:
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DK_spring_fix.asm
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