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optimize fire code

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This commit is contained in:
Peter Ferrie 2019-05-31 23:55:01 -04:00 committed by Vince Weaver
parent 2e4a237fff
commit efbb34fce7
1 changed files with 30 additions and 30 deletions
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60
pt3_player/fire.s
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@ -33,9 +33,9 @@ done_fire_line_loop:
lda FIRE_FB_L
adc #40
sta FIRE_FB_L
lda FIRE_FB_H
adc #0
sta FIRE_FB_H
bcc skip_inc_hi
inc FIRE_FB_H
skip_inc_hi:
dex
bne clear_fire_loop
@ -142,18 +142,18 @@ fire_low:
; Q=1 3/4 of time
lda FIRE_Q ; 3
bne fire_one ; 0-3, is not 0 3/4 of time ; 2/3
beq fire_zero ; 3
beq fire_set ; 3
fire_medium:
cmp #$d ; 2
lda FIRE_Q ; 3
bcs fire_high ; bge ; 2/3
; Q=1 1/2 of time
lda FIRE_Q ; 3
and #$1 ; 2
jmp fire_set ; 3
bcc fire_set ; branch always ; 3
fire_high:
; Q=1 1/4 of time
lda FIRE_Q ; is 0 1/4 of time ; 3
;;lda FIRE_Q ; is 0 1/4 of time ; 3
bne fire_zero ; 2/3
fire_one:
lda #1 ; 2
@ -174,7 +174,7 @@ fire_set:
; bounds check
; on edges, don't wrap
cpy #0 ; 2
tya ; 2
beq fire_r_same ; 2/3
cpy #39 ; 2
beq fire_r_same ; 2/3
@ -184,15 +184,14 @@ fire_set:
; 25% chance comes from right
; 25% change comes from left
lda #$2 ; 2
bit SEEDH ; 3
bne fire_r_same ; 2/3
lda SEEDH ; 3
lsr ; 2
and #$1 ; 2
beq r_up ; 2/3
bne fire_r_same ; 2/3
bcc r_up ; 2/3
r_down:
dey ; 2
jmp fire_r_same ; 3
.byte $a9 ; 2
r_up:
iny ; 2
fire_r_same:
@ -232,17 +231,17 @@ 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
adc #0 ; 2
sta fire_smc5_fb+2 ; 4
bcc skip_fb_inc1 ; 2/3
inc fire_smc5_fb+2 ; 4
clc ; 2
skip_fb_inc1:
lda fire_smc5_fb2+1 ; 4
adc #40 ; 2
sta fire_smc5_fb2+1 ; 4
lda fire_smc5_fb2+2 ; 4
adc #0 ; 2
sta fire_smc5_fb2+2 ; 4
bcc skip_fb2_inc1 ; 2/3
inc fire_smc5_fb2+2 ; 4
skip_fb2_inc1:
inx ; 2
cpx #(FIRE_YSIZE-1) ; 2
@ -259,11 +258,12 @@ fire_update_done:
lda #<fire_framebuffer ; 2
sta fire_smc_fb+1 ; 5
lda #>fire_framebuffer ; 2
sta fire_smc_fb+2 ; 5
lda #<(fire_framebuffer+40) ; 2
sta fire_smc_fb2+1 ; 5
lda #>fire_framebuffer ; 2
sta fire_smc_fb+2 ; 5
;this lda could be omitted if values match
lda #>(fire_framebuffer+40) ; 2
sta fire_smc_fb2+2 ; 5
@ -323,17 +323,17 @@ done_fire_fb_copy_loop:
lda fire_smc_fb+1 ; 4
adc #80 ; 2
sta fire_smc_fb+1 ; 5
lda fire_smc_fb+2 ; 4
adc #0 ; 2
sta fire_smc_fb+2 ; 5
bcc skip_fb_inc2 ; 2/3
inc fire_smc_fb+2 ; 5
clc ; 2
skip_fb_inc2:
lda fire_smc_fb2+1 ; 4
adc #80 ; 2
sta fire_smc_fb2+1 ; 5
lda fire_smc_fb2+2 ; 4
adc #0 ; 2
sta fire_smc_fb2+2 ; 5
bcc skip_fb2_inc2 ; 2/3
inc fire_smc_fb2+2 ; 5
skip_fb2_inc2:
dex ; 2
bne fire_fb_copy ; 2/3