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Copy pathparticles_oriented.rs
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144 lines (127 loc) · 4.57 KB
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use processing_glfw::GlfwContext;
use bevy::math::Vec3;
use processing::prelude::*;
use processing_render::render::command::DrawCommand;
const SPIN_SHADER: &str = r#"
@group(0) @binding(0) var<storage, read_write> rotation: array<f32>;
@group(0) @binding(1) var<uniform> params: vec4<f32>; // x = dt
fn quat_mul(a: vec4<f32>, b: vec4<f32>) -> vec4<f32> {
return vec4<f32>(
a.w * b.xyz + b.w * a.xyz + cross(a.xyz, b.xyz),
a.w * b.w - dot(a.xyz, b.xyz),
);
}
@compute @workgroup_size(64)
fn main(@builtin(global_invocation_id) gid: vec3<u32>) {
let i = gid.x;
let count = arrayLength(&rotation) / 4u;
if i >= count {
return;
}
let dt = params.x;
let q = vec4<f32>(
rotation[i * 4u + 0u],
rotation[i * 4u + 1u],
rotation[i * 4u + 2u],
rotation[i * 4u + 3u],
);
let half_angle = dt * 0.5;
let dq = vec4<f32>(0.0, sin(half_angle), 0.0, cos(half_angle));
let q_new = quat_mul(q, dq);
rotation[i * 4u + 0u] = q_new.x;
rotation[i * 4u + 1u] = q_new.y;
rotation[i * 4u + 2u] = q_new.z;
rotation[i * 4u + 3u] = q_new.w;
}
"#;
fn main() {
sketch().unwrap();
exit(0).unwrap();
}
fn sketch() -> error::Result<()> {
let mut glfw_ctx = GlfwContext::new(900, 700, false)?;
init(Config::default())?;
let surface = glfw_ctx.create_surface(900, 700, false)?;
let graphics = graphics_create(surface, 900, 700, TextureFormat::Rgba16Float)?;
graphics_mode_3d(graphics)?;
transform_set_position(graphics, Vec3::new(0.0, 6.0, 18.0))?;
transform_look_at(graphics, Vec3::new(0.0, 0.0, 0.0))?;
let _light =
light_create_directional(graphics, bevy::color::Color::srgb(0.9, 0.85, 0.8), 300.0)?;
let cube = geometry_box(0.6, 0.6, 0.6)?;
let capacity: u32 = 125;
let mut positions: Vec<f32> = Vec::with_capacity(capacity as usize * 3);
let mut rotations: Vec<f32> = Vec::with_capacity(capacity as usize * 4);
let mut scales: Vec<f32> = Vec::with_capacity(capacity as usize * 3);
for x in 0..5 {
for y in 0..5 {
for z in 0..5 {
positions.push((x as f32 - 2.0) * 1.6);
positions.push((y as f32 - 2.0) * 1.6);
positions.push((z as f32 - 2.0) * 1.6);
rotations.push(0.0);
rotations.push(0.0);
rotations.push(0.0);
rotations.push(1.0);
let s = 0.5 + ((x + y + z) as f32 * 0.06);
scales.push(s);
scales.push(s);
scales.push(s);
}
}
}
let position_attr = geometry_attribute_position();
let rotation_attr = geometry_attribute_rotation();
let scale_attr = geometry_attribute_scale();
let p = particles_create(capacity, vec![position_attr, rotation_attr, scale_attr])?;
let position_buf =
particles_buffer(p, position_attr)?.ok_or(error::ProcessingError::ParticlesNotFound)?;
let rotation_buf =
particles_buffer(p, rotation_attr)?.ok_or(error::ProcessingError::ParticlesNotFound)?;
let scale_buf =
particles_buffer(p, scale_attr)?.ok_or(error::ProcessingError::ParticlesNotFound)?;
buffer_write(
position_buf,
positions.iter().flat_map(|f| f.to_le_bytes()).collect(),
)?;
buffer_write(
rotation_buf,
rotations.iter().flat_map(|f| f.to_le_bytes()).collect(),
)?;
buffer_write(
scale_buf,
scales.iter().flat_map(|f| f.to_le_bytes()).collect(),
)?;
let pbr = material_create_pbr()?;
material_set(pbr, "roughness", shader_value::ShaderValue::Float(0.4))?;
let spin_shader = shader_create(SPIN_SHADER)?;
let spin = compute_create(spin_shader)?;
while glfw_ctx.poll_events() {
graphics_begin_draw(graphics)?;
graphics_record_command(
graphics,
DrawCommand::BackgroundColor(bevy::color::Color::srgb(0.06, 0.06, 0.08)),
)?;
graphics_record_command(
graphics,
DrawCommand::Fill(bevy::color::Color::srgb(0.9, 0.5, 0.3)),
)?;
graphics_record_command(graphics, DrawCommand::Material(pbr))?;
graphics_record_command(
graphics,
DrawCommand::Particles {
particles: p,
geometry: Some(cube),
topology: Default::default(),
},
)?;
graphics_end_draw(graphics)?;
compute_set(
spin,
"params",
shader_value::ShaderValue::Float4([0.015, 0.0, 0.0, 0.0]),
)?;
particles_apply(p, spin)?;
}
Ok(())
}