heavens 0.4.5

N-body GPU simulations with rendering
Documentation 
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struct Settings {
    display_width: f32,
    display_height: f32,
    pixel_size: f32,

    gravitational_constant: f32,
    time_step: f32,
    smoothing_length: f32,

    ghost_mass: f32,
    ghost_stack_visible_limit: f32,

    blur_radius: f32,
};

@group(0)
@binding(0)
var<uniform> settings: Settings;

@group(0)
@binding(1)
var<storage, read> ghost_forces_and_kinds: array<vec4<f32>>;

@group(0)
@binding(2)
var<storage, read_write> ghost_velocities_and_kinds: array<vec4<f32>>;

@compute
@workgroup_size(64, 1, 1)
fn main(@builtin(global_invocation_id) global_id: vec3<u32>) {
    let n = global_id.x;

    let fx = ghost_forces_and_kinds[n].x;
    let fy = ghost_forces_and_kinds[n].y;
    let fz = ghost_forces_and_kinds[n].z;

    ghost_velocities_and_kinds[n].x += fx * settings.time_step / settings.ghost_mass;
    ghost_velocities_and_kinds[n].y += fy * settings.time_step / settings.ghost_mass;
    ghost_velocities_and_kinds[n].z += fz * settings.time_step / settings.ghost_mass;
}