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pt3: minor cleanups in comments

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This commit is contained in:
Vince Weaver 2019-05-17 14:55:53 -04:00
parent 5074f45878
commit 92ab251101
1 changed files with 9 additions and 5 deletions
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14
pt3_player/fire.s
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@ -104,9 +104,10 @@ fire_fb_update:
; FIXME: optimize
; original = ??? (complex)
; -X : move
; TODO: unroll once and combine with the lores copy on even lines?
; Loopy Y (xpos) from 39 to 0
; Loop Y (xpos) from 39 to 0
ldy #39 ; 2
fire_fb_update_loop:
@ -164,11 +165,14 @@ fire_set:
;=================
; check if flame from left/right
; store Y as we over-write it
sty FIRE_Y ; 3
; bounds check
; on edges, don't wrap
cpy #0 ; 2
beq fire_r_same ; 2/3
@ -197,6 +201,7 @@ fire_r_same:
fire_smc5_fb2:
lda $1234,Y ; 4+
; restore saved Y
ldy FIRE_Y ; 3
; have value, subtract Q
@ -227,8 +232,7 @@ done_fire_fb_update_loop:
lda fire_smc5_fb+1 ; 4
adc #40 ; 2
sta fire_smc5_fb+1 ; 4
lda fire_smc5_fb+2
; 4
lda fire_smc5_fb+2 ; 4
adc #0 ; 2
sta fire_smc5_fb+2 ; 4