actraiser/dust-tutorial-c64-first-intro
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colorwash routine code comments updates

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Rocco 2015-11-28 21:55:28 +01:00
parent 0ead842514
commit c079cc7510
1 changed files with 2 additions and 2 deletions
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code/sub_colorwash.asm
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@ -1,6 +1,6 @@
colwash ldx #$27 ; load x-register with #$27 to work through 0-39 iterations colwash ldx #$27 ; load x-register with #$27 to work through 0-39 iterations
lda color+$27 ; init accumulator with the last color from first color table lda color+$27 ; init accumulator with the last color from first color table
cycle1 ldy color-1,x ; use y-register to remember color at current position in iteration cycle1 ldy color-1,x ; use y-register to remember color at next position in iteration
sta color-1,x ; write the stored color from accumulator to that location sta color-1,x ; write the stored color from accumulator to that location
sta $d990,x ; put it into Color Ram sta $d990,x ; put it into Color Ram
tya ; transfer our remembered color back to accumulator tya ; transfer our remembered color back to accumulator
@ -11,7 +11,7 @@ cycle1 ldy color-1,x ; use y-register to remember color at current position
; do the reverse for the second line of text in the intro ; do the reverse for the second line of text in the intro
colwash2 ldx #$00 ; load x-register with #$00 to track iterations colwash2 ldx #$00 ; load x-register with #$00 to track iterations
lda color2+$27 ; load the last color from the second table lda color2+$27 ; load the last color from the second table
cycle2 ldy color2,x ; remember currently pointed at color of second table in y-register cycle2 ldy color2,x ; remember previously used color of second table in y-register
sta color2,x ; store that color into accumulator sta color2,x ; store that color into accumulator
sta $d9e0,x ; ... and write it to Color Ram sta $d9e0,x ; ... and write it to Color Ram
tya ; transfer our remembered color back to accumulator tya ; transfer our remembered color back to accumulator