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91 lines
2.4 KiB
91 lines
2.4 KiB
use memoffset::offset_of;
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use ash::vk;
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use rand::{thread_rng, distributions::{Distribution, Uniform}};
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use cgmath::{InnerSpace, Vector2, Vector4};
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use crate::utility::constants::*;
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use std::f32::consts::PI;
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const PARTICLE_COUNT: i32 = 1000;
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#[repr(C)]
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#[derive(Clone, Debug, Copy)]
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pub struct Particle {
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pos: Vector2<f32>,
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vel: Vector2<f32>,
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color: Vector4<f32>,
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}
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impl Particle {
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pub fn gen() -> Vec<Self> {
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let mut res = vec![];
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let between = Uniform::from(0.0..1.0);
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let mut rng = thread_rng();
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for _i in 0..PARTICLE_COUNT {
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let r = (between.sample(&mut rng) as f32).sqrt();
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let theta = between.sample(&mut rng) * 2.0 * PI;
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let x = r * theta.cos() * WINDOW_HEIGHT as f32 * WINDOW_WIDTH as f32;
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let y = r * theta.sin();
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res.push(
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Particle {
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pos: Vector2::new(x, y),
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vel: Vector2::new(x, y).normalize() * 0.00025,
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color: Vector4::new(between.sample(&mut rng), between.sample(&mut rng), between.sample(&mut rng), 1.0),
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}
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)
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}
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res
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}
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}
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#[repr(C)]
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#[derive(Clone, Debug, Copy)]
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pub struct Vertex {
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pos: [f32; 2],
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color: [f32; 3],
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}
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impl Vertex {
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pub fn get_binding_description() -> [vk::VertexInputBindingDescription; 1] {
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[vk::VertexInputBindingDescription {
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binding: 0,
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stride: std::mem::size_of::<Vertex>() as u32,
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input_rate: vk::VertexInputRate::VERTEX,
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}]
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}
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pub fn get_attribute_descriptions() -> [vk::VertexInputAttributeDescription; 2] {
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[
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vk::VertexInputAttributeDescription {
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binding: 0,
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location: 0,
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format: vk::Format::R32G32_SFLOAT,
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offset: offset_of!(Vertex, pos) as u32,
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},
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vk::VertexInputAttributeDescription {
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binding: 0,
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location: 1,
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format: vk::Format::R32G32B32_SFLOAT,
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offset: offset_of!(Vertex, color) as u32,
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},
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]
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}
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}
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pub const TRI_VERT_DATA: [Vertex; 3] = [
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Vertex {
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pos: [0.0, -0.5],
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color: [1.0, 1.0, 1.0],
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},
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Vertex {
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pos: [0.5, 0.5],
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color: [0.0, 1.0, 0.0],
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},
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Vertex {
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pos: [-0.5, 0.5],
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color: [0.0, 0.0, 1.0],
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},
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];
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