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waterfall: half the walking works

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This commit is contained in:
Vince Weaver 2018-08-02 22:10:51 -04:00
parent f71d340a15
commit 77f45cc4d9
1 changed files with 45 additions and 24 deletions
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69
waterfall/waterfall.s
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@ -232,11 +232,18 @@ page1_loop: ; delay 115+(7 loop)+4 (bit)+4(extra)
; -6 jsr to do_nothing
; -49 check for keypress
; -2252 copy screen
; -2214 draw sprite
; -2231 draw sprite
; =============
; 28
; 11 cycles
; jsr do_nothing ; 6
; 17 cycles
inc YPOS ; 5
inc YPOS ; 5
inc YPOS ; 5
nop ; 2
jsr do_nothing ; 6
;=========================
; Clear background
@ -250,39 +257,52 @@ page1_loop: ; delay 115+(7 loop)+4 (bit)+4(extra)
;==========================
; draw bird sprite
;==========================
; 13 + 11 + 2190 = 2214
; 8 prefix
; bird_walk_right= 14 + 2175 2206 (need 17)
; bird_stand_right= 13 + 2190 2206 (need 3)
; bird_walk_left= 15 + 2175 2206 (need 16)
; bird_stand_left= 14 + 2190 2206 (need 2)
; call to sprite 17 postfix
;====================================================
; 2231
lda BIRD_STATE ; 3
and #1 ; 2
ldx BIRD_DIR ; 3
bne bird_left
bird_right:
cmp #1
; 2
cmp #1 ; 2
beq bird_walk_right
; 2
bird_stand_right:
ldx #>bird_rider_stand_right ; 2
ldy #<bird_rider_stand_right ; 2
jmp draw_bird
lda YPOS ; nop=3
jmp draw_bird ; 3
bird_walk_right:
; 3
ldx #>bird_rider_walk_right ; 2
ldy #<bird_rider_walk_right ; 2
jmp draw_bird
jmp draw_bird ; 3
bird_left:
cmp #1
; 3
cmp #1 ; 2
beq bird_walk_left
bird_stand_left:
; 2
ldx #>bird_rider_stand_left ; 2
ldy #<bird_rider_stand_left ; 2
jmp draw_bird
nop ; nop=2
jmp draw_bird ; 3
bird_walk_left:
; 3
ldx #>bird_rider_walk_left ; 2
ldy #<bird_rider_walk_left ; 2
jmp draw_bird
jmp draw_bird ; 3
@ -295,7 +315,7 @@ draw_bird:
jsr put_sprite ; 6
;=========
; 11 + 2190
; 17 + 2190
@ -369,26 +389,26 @@ adjust_xpos:
;=================================
; do nothing
;=================================
; and take 28-6 = 22 cycles to do it
do_nothing:
; and take 11-6 = 5 cycles to do it
;do_nothing:
; Try X=3 Y=1 cycles=22
; nop ; 2
; nop ; 2
ldy #1 ; 2
loop1:
ldx #3 ; 2
loop2:
dex ; 2
bne loop2 ; 2nt/3
; ldy #1 ; 2
;loop1:
; ldx #3 ; 2
;loop2:
; dex ; 2
; bne loop2 ; 2nt/3
dey ; 2
bne loop1 ; 2nt/3
; dey ; 2
; bne loop1 ; 2nt/3
rts ; 6
; rts ; 6
@ -441,5 +461,6 @@ gr_offsets:
.include "waterfall_page1.inc"
.include "waterfall_page2.inc"
.align $100
.include "tfv_sprites.inc"