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sprites: collision works

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This commit is contained in:
Vince Weaver 2019-06-13 13:42:52 -04:00
parent f328d18e9a
commit 8eaa700bda
1 changed files with 68 additions and 14 deletions
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82
interlace_demo/sprites.s
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@ -106,10 +106,10 @@ start_sprites:
lda #$ff
sta GREEN2
lda #$36
lda #36
sta ASTEROID_X
lda #$12
lda #12
sta ASTEROID_Y
lda #64
@ -248,6 +248,7 @@ display_loop:
; -337 -- erase asteroid
; -31 -- move ship
; -17 -- move fire
; -51 -- collide asteroid/fire
; -56 -- move asteroid
; -436 -- draw fire
; -337 -- draw asteroid
@ -255,7 +256,7 @@ display_loop:
; -33 -- handle fire press
; -8 -- loop
;=======
; 417
; 366
@ -464,6 +465,61 @@ done_move:
;==========================
; collision (fire/asteroid)
;==========================
; none: 13 [20+18]
; xmatch not y: 13+20 [18]
; explosion: 13+20+18 = 51
sec ; 2
lda ASTEROID_X ; 3
sbc FIRE_X ; 3
cmp #252 ; 2
bcc no_collide_x ; 3 ; blt
;===
; 13
; -1
lda FIRE_Y ; 3
lsr ; 2
lsr ; 2
clc ; 2
adc #$9 ; 2
sec ; 2
sbc ASTEROID_Y ; 3
cmp #4 ; 2
bcs no_collide_y ; 3 ; bge
;===
; 20
; -1
lda #36 ; 2
sta ASTEROID_X ; 3
lda #0 ; 2
sta FIRE_X ; 3
inc $408 ; 6
jmp collision_done ; 3
;====
; 18
no_collide_x:
inc TEMP ; 5
inc TEMP ; 5
inc TEMP ; 5
inc TEMP ; 5
no_collide_y:
inc TEMP ; 5
inc TEMP ; 5
inc TEMP ; 5
lda TEMP ; 3
collision_done:
;==========================
; draw the ship
@ -717,11 +773,11 @@ pad_time:
; WAIT for VBLANK to finish
;============================
; nop
; nop
; nop
; nop
; nop
nop
nop
nop
nop
nop
; nop
; nop
; nop
@ -730,14 +786,12 @@ pad_time:
wait_loop:
; Try X=82 Y=1 cycles=417
; Try X=13 Y=5 cycles=356
; nop
; nop
ldy #1 ; 2
loop1: ldx #82 ; 2
ldy #5 ; 2
loop1: ldx #13 ; 2
loop2: dex ; 2
bne loop2 ; 2nt/3
dey ; 2
@ -979,6 +1033,7 @@ sprite_line:
ldy TEMPY ; 3
rts ; 6
;========================
; Erase a line of a sprite
;========================
@ -1028,7 +1083,6 @@ erase_line:
ldy TEMPY ; 3
rts ; 6
;========================
; Draw a line of a fire
;========================