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particles_basic.rs

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use processing_glfw::GlfwContext;

use bevy::math::Vec3;

use processing::prelude::*;

use processing_render::render::command::DrawCommand;

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, 0.0, 25.0))?;

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 sphere = geometry_sphere(0.25, 12, 8)?;

let capacity: u32 = 1000;

let mut floats: Vec<f32> = Vec::with_capacity(capacity as usize * 3);

for x in 0..10 {

for y in 0..10 {

for z in 0..10 {

floats.push((x as f32 - 4.5) * 1.0);

floats.push((y as f32 - 4.5) * 1.0);

floats.push((z as f32 - 4.5) * 1.0);

}

let bytes: Vec<u8> = floats.iter().flat_map(|f| f.to_le_bytes()).collect();

let position_attr = geometry_attribute_position();

let p = particles_create(capacity, vec![position_attr])?;

let position_buf =

particles_buffer(p, position_attr)?.ok_or(error::ProcessingError::ParticlesNotFound)?;

buffer_write(position_buf, bytes)?;

let pbr = material_create_pbr()?;

material_set(pbr, "roughness", shader_value::ShaderValue::Float(0.4))?;

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(sphere),

topology: Default::default(),

)?;

graphics_end_draw(graphics)?;

}

Ok(())

}