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pt3: more self modifying code

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This commit is contained in:
Vince Weaver 2019-05-16 14:58:13 -04:00
parent 6a38f9a56a
commit fe990c3119
1 changed files with 21 additions and 18 deletions
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39
pt3_player/fire.s
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@ -77,16 +77,15 @@ draw_fire_frame:
;===============================
lda #<fire_framebuffer ; 2
sta FIRE_FB_L ; 3
sta fire_smc5_fb+1 ; 4
lda #>fire_framebuffer ; 2
sta FIRE_FB_H ; 3
sta fire_smc5_fb+2 ; 4
lda #<(fire_framebuffer+40) ; 2
sta FIRE_FB2_L ; 3
sta fire_smc5_fb2+1 ; 4
lda #>(fire_framebuffer+40) ; 2
sta FIRE_FB2_H ; 3
sta fire_smc5_fb2+2 ; 4
ldx #0 ; 2
@ -96,7 +95,8 @@ fire_fb_update:
; original = ??? (complex)
; -X : move
ldy #39 ; 2
ldy #39
; stx FIRE_X ; 2
fire_fb_update_loop:
; Get random 16-bit number
@ -159,7 +159,8 @@ fire_height_done:
sty FIRE_Y ; 3
;
; bounds check
cpy #0 ; 2
beq fire_r_same ; 2/3
cpy #39 ; 2
@ -179,7 +180,8 @@ r_up:
fire_r_same:
; get next line color
lda (FIRE_FB2_L),Y ; 5+
fire_smc5_fb2:
lda $1234,Y ; 4+
ldy FIRE_Y ; 3
@ -193,7 +195,8 @@ fire_r_same:
fb_positive:
; store out
sta (FIRE_FB_L),Y ; store out ; 6
fire_smc5_fb:
sta $1234,Y ; store out ; 5
dey ; 2
bpl fire_fb_update_loop ; 2/3
@ -202,20 +205,20 @@ done_fire_fb_update_loop:
; complicated adjustment
clc ; 2
lda FIRE_FB_L ; 3
lda fire_smc5_fb+1 ; 4
adc #40 ; 2
sta FIRE_FB_L ; 3
lda FIRE_FB_H ; 3
sta fire_smc5_fb+1 ; 4
lda fire_smc5_fb+2 ; 4
adc #0 ; 2
sta FIRE_FB_H ; 3
sta fire_smc5_fb+2 ; 4
clc ; 2
lda FIRE_FB2_L ; 3
lda fire_smc5_fb2+1 ; 4
adc #40 ; 2
sta FIRE_FB2_L ; 3
lda FIRE_FB2_H ; 3
sta fire_smc5_fb2+1 ; 4
lda fire_smc5_fb2+2 ; 4
adc #0 ; 2
sta FIRE_FB2_H ; 3
sta fire_smc5_fb2+2 ; 4
inx ; 2
cpx #(FIRE_YSIZE-1) ; 2
@ -223,7 +226,7 @@ done_fire_fb_update_loop:
jmp fire_fb_update ; 3
fire_update_done:
; ldx FIRE_X
;===============================
; copy framebuffer to low-res screen