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// Copyright(C) 2019 Lars Pontoppidan. All rights reserved.
// Use of this source code is governed by an MIT license file distributed with this software package
module particle
import particle.vec2
import rand
import sokol.sgl
pub struct SystemConfig {
pool int
}
pub struct System {
width int
height int
mut:
pool []&Particle
bin []&Particle
}
pub fn (mut s System) init(sc SystemConfig) {
for i := 0; i < sc.pool; i++ {
p := new(vec2.Vec2{f32(s.width) * 0.5, f32(s.height) * 0.5})
s.bin << p
}
}
pub fn (mut s System) update(dt f64) {
mut p := &Particle(0)
for i := 0; i < s.pool.len; i++ {
p = s.pool[i]
p.update(dt)
if p.is_dead() {
s.bin << p
s.pool.delete(i)
}
}
}
pub fn (s System) draw() {
sgl.begin_quads()
for p in s.pool {
p.draw()
}
sgl.end()
}
pub fn (mut s System) reset() {
for i in 0 .. s.pool.len {
mut p := s.pool[i]
p.reset()
p.life_time = 0
}
for i in 0 .. s.bin.len {
mut p := s.pool[i]
p.reset()
p.life_time = 0
}
}
pub fn (mut s System) explode(x f32, y f32) {
mut reserve := 500
center := vec2.Vec2{x, y}
mut p := &Particle(0)
for i := 0; i < s.bin.len && reserve > 0; i++ {
p = s.bin[i]
p.reset()
p.location.from(center)
p.acceleration = vec2.Vec2{rand.f32_in_range(-0.5, 0.5), rand.f32_in_range(-0.5,
0.5)}
p.velocity = vec2.Vec2{rand.f32_in_range(-0.5, 0.5), rand.f32_in_range(-0.5, 0.5)}
p.life_time = rand.f64_in_range(500, 2000)
s.pool << p
s.bin.delete(i)
reserve--
}
}
pub fn (mut s System) free() {
for p in s.pool {
if p == 0 {
print(ptr_str(p) + ' ouch')
continue
}
unsafe { free(p) }
}
s.pool.clear()
for p in s.bin {
if p == 0 {
print(ptr_str(p) + ' ouch')
continue
}
unsafe {
// println('Freeing from bin')
free(p)
}
}
s.bin.clear()
}
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