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