49 lines
1.1 KiB
Odin
49 lines
1.1 KiB
Odin
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package main
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import rl "vendor:raylib"
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import "core:math/ease"
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import "core:slice"
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Trail :: struct {
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pos : vec3,
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lifetime: f32,
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time: f32,
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max_size: f32,
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color: rl.Color,
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}
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trails_buf := [1024]Trail{}
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trails : [dynamic]Trail
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trail :: proc(pos: vec3, max_size, lifetime: f32, color: rl.Color = rl.WHITE) {
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append(&trails, Trail{
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pos = pos,
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lifetime = lifetime,
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max_size = max_size,
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color = color
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})
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}
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trail_init :: proc() {
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trails = slice.into_dynamic(trails_buf[:])
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}
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trail_update :: proc(delta: f32) {
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#reverse for &t, i in trails {
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t.time += delta
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if t.time >= t.lifetime {unordered_remove(&trails, i)}
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}
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}
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trail_draw :: proc() {
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// rl.BeginBlendMode(rl.BlendMode.ADD_COLORS)
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for t in trails {
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d := t.time / t.lifetime
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step1 := ease.ease(ease.Ease.Back_Out, d)
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step2 := ease.ease(ease.Ease.Cubic_In_Out, 1 - d)
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size := step1 * step2
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// alpha := ease.ease(ease.Ease.Cubic_Out, d)
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rl.DrawSphereEx(t.pos, size, 5, 4, t.color)
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}
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// rl.EndBlendMode()
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}
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