/
stars.asm
124 lines (85 loc) · 2.2 KB
/
stars.asm
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init_title_stars:
lda #SINGLE_PARTICLE_EFFECT_AMOUNT
sta CurrentParticle
init_stars_loop
dec CurrentParticle
jsr init_single_title_star
lda CurrentParticle
cmpa #0
bne init_stars_loop
rts
init_single_title_star:
ldb #0
lda CurrentParticle
ldx #ParticleActive
stb a,x
rts
draw_title_stars:
lda #SINGLE_PARTICLE_EFFECT_AMOUNT
sta CurrentParticle
draw_stars_loop
dec CurrentParticle
jsr add_single_star
jsr draw_single_star
jsr update_single_star
lda CurrentParticle
cmpa #0
bne draw_stars_loop
rts
add_single_star:
ldb CurrentParticle
ldx #ParticleActive
lda b,x
cmpa #0
bne add_star_over
jsr Random
jsr randomize_a_sign
ldb CurrentParticle
ldx #ParticlePositionX
sta b,x
jsr Random
jsr randomize_a_sign
ldb CurrentParticle
ldx #ParticlePositionY
sta b,x
jsr Random
anda #0xF
ldb CurrentParticle
ldx #ParticleTime
sta b,x
lda #1
ldb CurrentParticle
ldx #ParticleActive
sta b,x
add_star_over;
rts
draw_single_star:
ldb CurrentParticle
ldx #ParticlePositionY
lda b,x
ldx #ParticlePositionX
ldb b,x
jsr Moveto_d
jsr Dot_here
ldb CurrentParticle
ldx #ParticlePositionY
lda b,x
ldx #ParticlePositionX
ldb b,x
nega
negb
jsr Moveto_d
rts
update_single_star
ldb CurrentParticle
ldx #ParticleTime
lda b,x
deca
sta b,x
cmpa #0
bne remove_star_over
lda #0
ldx #ParticleActive
sta b,x
remove_star_over:
rts