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use crate::{
component::{CompositeMesh, CompositeRenderable, CompositeSurfaceCache},
composite_renderer::{Command, Mask, PathElement, Renderable, Triangles},
math::Vec2,
mesh_asset_protocol::{Mesh, MeshAsset, MeshVertex},
};
use core::{
assets::{asset::AssetId, database::AssetsDatabase},
ecs::{Comp, Universe, WorldRef},
};
use std::collections::HashMap;
#[derive(Debug, Default)]
pub struct CompositeMeshSystemCache {
meshes_cache: HashMap<String, Mesh>,
meshes_table: HashMap<AssetId, String>,
}
pub type CompositeMeshSystemResources<'a> = (
WorldRef,
&'a AssetsDatabase,
&'a mut CompositeMeshSystemCache,
Comp<&'a mut CompositeMesh>,
Comp<&'a mut CompositeRenderable>,
Comp<&'a mut CompositeSurfaceCache>,
);
pub fn composite_mesh_system(universe: &mut Universe) {
let (world, assets, mut cache, ..) = universe.query_resources::<CompositeMeshSystemResources>();
for id in assets.lately_loaded_protocol("mesh") {
let id = *id;
let asset = assets
.asset_by_id(id)
.expect("trying to use not loaded mesh asset");
let path = asset.path().to_owned();
let asset = asset
.get::<MeshAsset>()
.expect("trying to use non-mesh asset");
let mesh = asset.mesh().clone();
cache.meshes_cache.insert(path.clone(), mesh);
cache.meshes_table.insert(id, path);
}
for id in assets.lately_unloaded_protocol("mesh") {
if let Some(path) = cache.meshes_table.remove(id) {
cache.meshes_cache.remove(&path);
}
}
for (_, (mesh, renderable, surface)) in world
.query::<(
&mut CompositeMesh,
&mut CompositeRenderable,
Option<&mut CompositeSurfaceCache>,
)>()
.iter()
{
if mesh.dirty_mesh || mesh.dirty_visuals {
if let Some(r) = build_renderable(mesh, &cache.meshes_cache) {
renderable.0 = r;
if let Some(surface) = surface {
surface.rebuild();
}
mesh.dirty_mesh = false;
mesh.dirty_visuals = false;
}
}
}
}
fn build_renderable<'a>(
mesh: &mut CompositeMesh,
meshes: &HashMap<String, Mesh>,
) -> Option<Renderable<'a>> {
if let Some(asset) = meshes.get(mesh.mesh()) {
if mesh.dirty_mesh {
if let Some(root) = &asset.rig {
mesh.setup_bones_from_rig(root);
}
}
if mesh.dirty_visuals {
let vertices = if let Some(root) = &asset.rig {
mesh.rebuild_model_space(root);
build_skined_vertices(&asset.vertices, mesh)
} else {
build_vertices(&asset.vertices)
};
let masks = asset
.masks
.iter()
.map(|indices| build_mask(&vertices, &indices.indices))
.collect::<Vec<_>>();
let mut meta = asset
.submeshes
.iter()
.zip(mesh.materials().iter())
.filter_map(|(submesh, material)| {
if material.alpha > 0.0 {
let triangles = Triangles {
image: material.image.to_string().into(),
color: Default::default(),
vertices: vertices.to_vec(),
faces: submesh.cached_faces().to_vec(),
};
let masks = submesh
.masks
.iter()
.map(|i| masks[*i].to_vec())
.collect::<Vec<_>>();
Some((triangles, material.alpha, material.order, masks))
} else {
None
}
})
.collect::<Vec<_>>();
meta.sort_by(|a, b| a.2.partial_cmp(&b.2).unwrap());
let count = meta.len() * 4 + meta.iter().fold(0, |a, v| a + v.3.len());
let mut commands = Vec::with_capacity(count);
for (triangles, alpha, _, masks) in meta {
commands.push(Command::Store);
for mask in masks {
let mask = Mask { elements: mask };
commands.push(Command::Draw(mask.into()));
}
commands.push(Command::Alpha(alpha));
commands.push(Command::Draw(triangles.into()));
commands.push(Command::Restore);
}
return Some(Renderable::Commands(commands));
}
}
None
}
fn build_skined_vertices(vertices: &[MeshVertex], mesh: &CompositeMesh) -> Vec<(Vec2, Vec2)> {
vertices
.iter()
.map(|v| {
let p = v.bone_info.iter().fold(Vec2::default(), |a, i| {
let p = if let Some(m) = mesh.bones_model_space.get(&i.name) {
*m * v.position
} else {
v.position
};
a + p * i.weight
});
(p, v.tex_coord)
})
.collect::<Vec<_>>()
}
fn build_vertices(vertices: &[MeshVertex]) -> Vec<(Vec2, Vec2)> {
vertices
.iter()
.map(|v| (v.position, v.tex_coord))
.collect::<Vec<_>>()
}
fn build_mask(vertices: &[(Vec2, Vec2)], indices: &[usize]) -> Vec<PathElement> {
let mut result = Vec::with_capacity(indices.len());
for index in indices {
if *index == 0 {
result.push(PathElement::MoveTo(vertices[*index].0));
} else {
result.push(PathElement::LineTo(vertices[*index].0));
}
}
result
}