1#import bevy_render::view::View
2#import bevy_enoki::particle_vertex_out::{ VertexOutput }
3
4@group(0) @binding(0) var<uniform> view: View;
5
6struct VertexIn {
7    @builtin(vertex_index) index: u32,
8    @location(0) i_transform: vec4<f32>,
9    @location(1) i_scale_lifetime: vec4<f32>,
10    @location(2) i_color: vec4<f32>,
11};
12
13@vertex
14fn vertex(in: VertexIn) -> VertexOutput {
15    var out: VertexOutput;
16
17    let vertex_position = vec3<f32>(
18        f32(in.index & 0x1u),
19        f32((in.index & 0x2u) >> 1u),
20        0.0
21    );
22
23    let local = vertex_position.xy - vec2(0.5, 0.5);
24    let scaled = local * in.i_scale_lifetime.xy;
25    let angle = in.i_transform.w;
26    let sine = sin(angle);
27    let cosine = cos(angle);
28    let rotated = vec2(
29        cosine * scaled.x - sine * scaled.y,
30        sine * scaled.x + cosine * scaled.y,
31    );
32    let world_position = vec3(in.i_transform.xy + rotated, in.i_transform.z);
33
34    out.clip_position = view.clip_from_world * vec4(world_position, 1.0);
35
36    out.color = in.i_color;
37	out.uv = vec2(vertex_position.x, 1.-vertex_position.y);
38
39	out.lifetime_frac = in.i_scale_lifetime.z;
40	out.lifetime_total = in.i_scale_lifetime.w;
41
42    return out;
43}