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|
use crate::sim::sim_manager::SimManager;
#[repr(C)]
#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
struct RendererParticle {
position: [f32; 2],
data: u32,
life: f32,
}
fn create_particle_buffer(device: &wgpu::Device, capacity: usize) -> wgpu::Buffer {
device.create_buffer(&wgpu::BufferDescriptor {
label: Some("Particle buffer"),
size: (capacity * size_of::<RendererParticle>()) as u64,
usage: wgpu::BufferUsages::STORAGE | wgpu::BufferUsages::COPY_DST,
mapped_at_creation: false,
})
}
pub struct ParticlesRendererState {
pub particle_pipeline: wgpu::RenderPipeline,
pub particle_buffer: wgpu::Buffer,
pub particle_bind_group: wgpu::BindGroup,
pub particle_capacity: usize,
particles_count: usize,
}
impl ParticlesRendererState {
pub fn update_buffers(&mut self, device: &wgpu::Device, queue: &wgpu::Queue, sim: &SimManager) {
puffin::profile_function!();
// TODO could cull this to visible, maybe it's slower?
let particles: Vec<RendererParticle> = sim
.particle_manager
.particles
.iter()
.map(|p| RendererParticle {
position: [p.position.x, p.position.y],
data: p.material as u32,
life: p.life,
})
.collect();
if particles.len() > self.particle_capacity {
self.particle_capacity = particles.len().next_power_of_two();
self.particle_buffer = create_particle_buffer(&device, self.particle_capacity);
}
queue.write_buffer(&self.particle_buffer, 0, bytemuck::cast_slice(&particles));
self.particles_count = particles.len();
}
pub fn render(&self, render_pass: &mut wgpu::RenderPass) {
render_pass.set_pipeline(&self.particle_pipeline);
render_pass.set_bind_group(0, &self.particle_bind_group, &[]);
render_pass.draw(0..4, 0..self.particles_count as u32);
}
pub fn new(
device: &wgpu::Device,
surface_config: &wgpu::SurfaceConfiguration,
camera_uniform_buffer: &wgpu::Buffer,
palette_buffer: &wgpu::Buffer,
) -> Self {
let particle_bind_group_layout =
device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
label: None,
entries: &[
// camera uniform
wgpu::BindGroupLayoutEntry {
ty: wgpu::BindingType::Buffer {
ty: wgpu::BufferBindingType::Uniform,
has_dynamic_offset: false,
min_binding_size: None,
},
binding: 0,
count: None,
visibility: wgpu::ShaderStages::VERTEX,
},
// palette
wgpu::BindGroupLayoutEntry {
ty: wgpu::BindingType::Buffer {
ty: wgpu::BufferBindingType::Storage { read_only: true },
has_dynamic_offset: false,
min_binding_size: None,
},
binding: 1,
count: None,
visibility: wgpu::ShaderStages::FRAGMENT,
},
// instance buffer
wgpu::BindGroupLayoutEntry {
ty: wgpu::BindingType::Buffer {
ty: wgpu::BufferBindingType::Storage { read_only: true },
has_dynamic_offset: false,
min_binding_size: None,
},
binding: 2,
count: None,
visibility: wgpu::ShaderStages::VERTEX | wgpu::ShaderStages::FRAGMENT,
},
],
});
let particle_shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
label: Some("Particle shader"),
source: wgpu::ShaderSource::Wgsl(include_str!("../shader/particle.wgsl").into()),
});
let particle_pipeline_layout =
device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
label: None,
immediate_size: 0,
bind_group_layouts: &[Some(&particle_bind_group_layout)],
});
let particle_pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
label: None,
layout: Some(&particle_pipeline_layout),
vertex: wgpu::VertexState {
module: &particle_shader,
entry_point: Some("vs_main"),
buffers: &[],
compilation_options: wgpu::PipelineCompilationOptions::default(),
},
fragment: Some(wgpu::FragmentState {
module: &particle_shader,
entry_point: Some("fs_main"),
targets: &[Some(wgpu::ColorTargetState {
format: surface_config.format,
blend: Some(wgpu::BlendState::ALPHA_BLENDING),
write_mask: wgpu::ColorWrites::ALL,
})],
compilation_options: wgpu::PipelineCompilationOptions::default(),
}),
primitive: wgpu::PrimitiveState {
topology: wgpu::PrimitiveTopology::TriangleStrip,
strip_index_format: None,
front_face: wgpu::FrontFace::Ccw,
cull_mode: None,
polygon_mode: wgpu::PolygonMode::Fill,
unclipped_depth: false,
conservative: false,
},
depth_stencil: None,
multisample: wgpu::MultisampleState::default(),
multiview_mask: None,
cache: None,
});
let particle_capacity = 2048;
let particle_buffer = create_particle_buffer(&device, particle_capacity);
let particle_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
label: None,
layout: &particle_bind_group_layout,
entries: &[
wgpu::BindGroupEntry {
binding: 0,
resource: camera_uniform_buffer.as_entire_binding(),
},
wgpu::BindGroupEntry {
binding: 1,
resource: palette_buffer.as_entire_binding(),
},
wgpu::BindGroupEntry {
binding: 2,
resource: particle_buffer.as_entire_binding(),
},
],
});
ParticlesRendererState {
particle_pipeline,
particle_buffer,
particle_bind_group,
particle_capacity,
particles_count: 0,
}
}
}
|
