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|
use std::error::Error;
use crate::solar_system::Kilometers;
use crate::timeman::Second;
use crate::wgpuctx::{WgpuCtx, pipeline::RenderPipelineBuilder};
use super::*;
pub struct BodyRenderer
{
needs_rebuild: bool,
last_time: Option<Second>,
pipeline: wgpu::RenderPipeline,
body_instance_buffer: Option<(usize, wgpu::Buffer)>
}
impl BodyRenderer
{
pub fn new(
wgpuctx: &WgpuCtx)
-> Self {
let shader = wgpuctx.create_shader(
wgpu::include_wgsl!(concat!(
env!("CARGO_MANIFEST_DIR"),
"/assets/shaders/tacmap/body.wgsl")
));
let render_pipeline = RenderPipelineBuilder::new(&shader)
.add_bindgroup(&Camera::bindgroup_layout(wgpuctx))
.add_vertex_layout(BodyInstanceRaw::descr())
.cull_mode(None)
.build(Some("Tactical map render pipeline"), wgpuctx);
Self {
needs_rebuild: true,
last_time: None,
pipeline: render_pipeline,
body_instance_buffer: None
}
}
pub fn mark_to_rebuild(&mut self)
{ self.needs_rebuild = true; }
pub fn rebuild(
&mut self,
wgpuctx: &WgpuCtx,
solar_system: &SolarSystem)
{
if self.body_instance_buffer.is_some() && !self.needs_rebuild {
return;
}
self.needs_rebuild = false;
match self.body_instance_buffer.as_mut() {
Some(buffer) => {
buffer.1.destroy();
self.body_instance_buffer = None;
}
None => {}
}
let bodies = solar_system.bodies();
let buffer_len = bodies.len() * size_of::<BodyInstanceRaw>();
let buffer = wgpuctx.create_buffer(
&wgpu::BufferDescriptor {
label: Some("Tactical map bodies instance buffer"),
size: buffer_len as u64,
usage: wgpu::BufferUsages::COPY_DST |
wgpu::BufferUsages::VERTEX,
mapped_at_creation: false
}
);
self.last_time = None;
self.body_instance_buffer = Some((bodies.len(), buffer));
}
pub fn update(
&mut self,
wgpuctx: &WgpuCtx,
solar_system: &SolarSystem,
time: Second)
-> Result<(), Box<dyn Error>>
{
//If the last updated time is the same, we don't need to update
//the positions of all the bodies.
if self.last_time.is_some_and(|last_time| { last_time == time }) {
return Ok(());
}
self.last_time = Some(time);
let (_, bodies_buffer) = match &self.body_instance_buffer {
Some(tuple) => tuple,
None => return Err(Box::new(NeedsRebuildError))
};
let bodies = solar_system.bodies();
let body_instances = bodies.iter().map(|body| {
let position = body.position();
let origin = match body.get_orbits() {
Some(origin_id) => {
let origin_body = &bodies[origin_id];
origin_body.position()
},
None => cgmath::Vector3::new(0.0, 0.0, 0.0)
};
BodyInstance {
position: position,
origin: origin,
radius: body.radius()
}.raw()
}).collect::<Vec<_>>();
wgpuctx.queue().write_buffer(bodies_buffer, 0, bytemuck::cast_slice(&body_instances));
Ok(())
}
pub fn render(
&self,
pass: &mut wgpu::RenderPass,
camera: &Camera)
{
let (num_bodies, bodies_buffer) = match &self.body_instance_buffer {
Some(tuple) => tuple,
None => return
};
pass.set_pipeline(&self.pipeline);
pass.set_bind_group(0, camera.bindgroup(), &[]);
pass.set_vertex_buffer(0, bodies_buffer.slice(..));
pass.draw(0..6, 0..num_bodies.clone() as _);
}
} // impl RenderState
struct BodyInstance
{
position: cgmath::Vector3<Kilometers>,
origin: cgmath::Vector3<Kilometers>,
radius: f32
}
#[repr(C)]
#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
struct BodyInstanceRaw
{
position: [f32;3],
origin: [f32;3],
radius: f32
}
impl BodyInstance
{
fn raw(&self) -> BodyInstanceRaw
{
BodyInstanceRaw {
position: [
self.position.x as f32,
self.position.y as f32,
self.position.z as f32 ],
origin: [
self.origin.x as f32,
self.origin.y as f32,
self.origin.z as f32 ],
radius: self.radius
}
}
} // impl BodyInstance
impl BodyInstanceRaw
{
const ATTRIBS: [wgpu::VertexAttribute;3] =
wgpu::vertex_attr_array![0 => Float32x3, 1 => Float32x3, 2 => Float32];
pub fn descr()
-> wgpu::VertexBufferLayout<'static> {
use std::mem;
wgpu::VertexBufferLayout {
array_stride: mem::size_of::<Self>() as wgpu::BufferAddress,
step_mode: wgpu::VertexStepMode::Instance,
attributes: &Self::ATTRIBS
}
}
}
|
