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|
use std::error::Error;
use crate::fleet::FleetsManager;
use crate::solar_system::orbit::StaticOrbiter;
use crate::solar_system::{Kilometers};
use crate::timeman::{Second};
use crate::wgpuctx::{WgpuCtx, pipeline::RenderPipelineBuilder};
use super::*;
pub struct FleetRenderer
{
last_time: Option<Second>,
pipeline: wgpu::RenderPipeline,
fleet_instance_buffer: Option<(usize, wgpu::Buffer)>
}
struct FleetInstance
{
offset: cgmath::Vector3<Kilometers>,
origin: cgmath::Vector3<Kilometers>,
heading: cgmath::Vector2<cgmath::Rad<f32>>
}
#[repr(C)]
#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
struct FleetInstanceRaw
{
rotmat: [[f32;3];3],
origin: [f32;3],
offset: [f32;3],
}
impl FleetRenderer
{
pub fn new(
wgpuctx: &WgpuCtx)
-> Self {
let shader = wgpuctx.create_shader(
wgpu::include_wgsl!(concat!(
env!("CARGO_MANIFEST_DIR"),
"/assets/shaders/tacmap/fleet.wgsl")
));
let render_pipeline = RenderPipelineBuilder::new(&shader)
.add_bindgroup(&Camera::bindgroup_layout(wgpuctx))
.add_vertex_layout(FleetInstanceRaw::descr())
.cull_mode(None)
.build(Some("Tactical map fleet render pipeline"), wgpuctx);
Self {
last_time: None,
pipeline: render_pipeline,
fleet_instance_buffer: None
}
}
pub fn update(
&mut self,
wgpuctx: &WgpuCtx,
fleets_manager: &FleetsManager,
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);
if let Some((_, buffer)) = &self.fleet_instance_buffer {
buffer.destroy();
self.fleet_instance_buffer = None;
}
let fleets = solar_system.fleets(fleets_manager);
let fleets_instances = fleets.iter().filter_map(|id| {
let fleet = match fleets_manager.entry(*id) {
Some(fleet) => fleet,
None => { return None; }
};
let heading = fleet.heading();
let offset = fleet.offset_position();
let origin = match fleet.orbit() {
Some(orbit) => {
let origin_body = solar_system.body(orbit.parent());
origin_body.absolute_position(solar_system, time)
},
None => cgmath::vec3(0.0, 0.0, 0.0)
};
Some(
FleetInstance {
heading: *heading,
offset: *offset,
origin: origin
}.raw()
)
}).collect::<Vec<_>>();
let fleets_buffer = wgpuctx.create_buffer_init(
&wgpu::util::BufferInitDescriptor {
label: None,
contents: bytemuck::cast_slice(fleets_instances.as_slice()),
usage: wgpu::BufferUsages::VERTEX
});
self.fleet_instance_buffer = Some((fleets.len(), fleets_buffer));
Ok(())
}
pub fn render(
&self,
pass: &mut wgpu::RenderPass,
camera: &Camera)
{
let (num_fleets, fleets_buffer) = match &self.fleet_instance_buffer {
Some(tuple) => tuple,
None => return
};
if *num_fleets == 0 { return; }
pass.set_pipeline(&self.pipeline);
pass.set_bind_group(0, camera.bindgroup(), &[]);
pass.set_vertex_buffer(0, fleets_buffer.slice(..));
pass.draw(0..6, 0..*num_fleets as _);
}
} // impl RenderState
impl FleetInstance
{
fn raw(&self) -> FleetInstanceRaw
{
FleetInstanceRaw {
rotmat: (cgmath::Matrix3::from_angle_x(self.heading.x) *
cgmath::Matrix3::from_angle_y(self.heading.y))
.into(),
origin: [
self.origin.x as f32,
self.origin.y as f32,
self.origin.z as f32
],
offset: [
self.offset.x as f32,
self.offset.y as f32,
self.offset.z as f32
]
}
}
} // impl BodyInstance
impl FleetInstanceRaw
{
const ATTRIBS: [wgpu::VertexAttribute;5] =
wgpu::vertex_attr_array![
0 => Float32x3, 1 => Float32x3, 2 => Float32x3,
3 => Float32x3,
4 => Float32x3
];
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
}
}
}
|
