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refactor WGClearScreen

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4am 2018-03-02 14:20:17 -05:00
parent 6a8b8652d9
commit 3c9aee9d6b
2 changed files with 34 additions and 57 deletions
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91
painting.s
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@ -7,80 +7,57 @@
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; WGClearScreen
; Clears the text screen (assumes 80 cols)
; Side effects: Clobbers BASL,BASH
;
WGClearScreen:
SAVE_AXY
SETSWITCH PAGE2OFF
ldx #23
WGClearScreen_lineLoop:
lda TEXTLINES_L,x ; Compute video memory address of line
sta BASL
lda TEXTLINES_H,x
sta BASH
ldy #39
lda #' ' + $80
WGClearScreen_charLoop:
sta (BASL),y
SETSWITCH PAGE2ON
sta (BASL),y
SETSWITCH PAGE2OFF
dey
bpl WGClearScreen_charLoop
dex
bpl WGClearScreen_lineLoop
RESTORE_AXY
rts
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; WGDesktop
; Paints the desktop pattern (assumes 80 cols)
;
WGDesktop:
pha
lda #'W'
sta WGClearScreen_charPage1+1
lda #'V'
bra WGClearScreen_common
SAVE_AXY
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; WGClearScreen
; Clears the text screen (assumes 80 cols)
;
WGClearScreen:
pha
lda #' ' + $80
sta WGClearScreen_charPage1+1
WGClearScreen_common:
sta WGClearScreen_charPage2+1
SAVE_XY
SETSWITCH PAGE2OFF
ldx #23
WGDesktop_lineLoop:
lda TEXTLINES_L,x ; Compute video memory address of line
sta WGDesktop_charLoop+1
sta WGDesktop_charLoop2+1
lda TEXTLINES_H,x
sta WGDesktop_charLoop+2
sta WGDesktop_charLoop2+2
WGClearScreen_lineLoop:
lda TEXTLINES_L,x ; Compute video memory address of line
sta WGClearScreen_charLoop1+1
sta WGClearScreen_charLoop2+1
lda TEXTLINES_H,x
sta WGClearScreen_charLoop1+2
sta WGClearScreen_charLoop2+2
ldy #39
lda #'W'
WGDesktop_charLoop:
WGClearScreen_charPage1:
lda #$FF ; Self-modifying code!
WGClearScreen_charLoop1:
sta $FFFF,y ; Self-modifying code!
dey
bpl WGDesktop_charLoop
bpl WGClearScreen_charLoop1
SETSWITCH PAGE2ON
ldy #39
lda #'V'
WGDesktop_charLoop2:
WGClearScreen_charPage2:
lda #$FF ; Self-modifying code!
WGClearScreen_charLoop2:
sta $FFFF,y ; Self-modifying code!
dey
bpl WGDesktop_charLoop2
bpl WGClearScreen_charLoop2
SETSWITCH PAGE2OFF
dex
bpl WGDesktop_lineLoop
RESTORE_AXY
bpl WGClearScreen_lineLoop
RESTORE_XY
pla
rts

BIN
weegui.dsk
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