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use std::collections::HashMap;
use std::sync::atomic::{AtomicU64, Ordering};
use crate::asset::Id as AssetId;
use crate::ecs::Sole;
pub type RawValue = u32;
/// Rendering object ID.
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum Id
{
Asset(AssetId),
Sequential(SequentialId),
}
impl Id
{
pub fn new_sequential() -> Self
{
static NEXT_SEQUENTIAL_ID: AtomicU64 = AtomicU64::new(0);
Self::Sequential(SequentialId(
NEXT_SEQUENTIAL_ID.fetch_add(1, Ordering::Relaxed),
))
}
pub fn into_asset_id(self) -> Option<AssetId>
{
match self {
Self::Asset(asset_id) => Some(asset_id),
Self::Sequential(_) => None,
}
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct SequentialId(u64);
/// Rendering object store.
#[derive(Debug, Default, Sole)]
pub struct Store
{
objects: HashMap<Id, Option<Object>>,
}
impl Store
{
pub fn get_obj(&self, id: &Id) -> Option<&Object>
{
self.objects.get(id).and_then(|obj| obj.as_ref())
}
pub fn get_texture_obj(&self, id: &Id) -> Option<&Object>
{
let obj = self.get_obj(id)?;
if !matches!(obj.kind(), Kind::Texture) {
return None;
}
Some(obj)
}
pub fn get_shader_program_obj(&self, id: &Id) -> Option<&Object>
{
let obj = self.get_obj(id)?;
if !matches!(obj.kind(), Kind::ShaderProgram) {
return None;
}
Some(obj)
}
pub fn contains_maybe_pending_with_id(&self, id: &Id) -> bool
{
self.objects.contains_key(id)
}
pub fn contains_non_pending_with_id(&self, id: &Id) -> bool
{
self.objects.get(id).and_then(|obj| obj.as_ref()).is_some()
}
pub fn insert(&mut self, id: Id, object: Object)
{
self.objects.insert(id, Some(object));
}
pub fn insert_pending(&mut self, id: Id)
{
self.objects.insert(id, None);
}
pub fn remove(&mut self, id: &Id) -> Option<Option<Object>>
{
self.objects.remove(id)
}
}
/// Rendering object.
#[derive(Debug, Clone)]
pub struct Object
{
raw: RawValue,
kind: Kind,
}
impl Object
{
pub fn from_raw(raw: RawValue, kind: Kind) -> Self
{
Self { raw, kind }
}
pub fn as_raw(&self) -> RawValue
{
self.raw
}
pub fn kind(&self) -> Kind
{
self.kind
}
}
/// Rendering object kind.
#[derive(Debug, Clone, Copy)]
#[non_exhaustive]
pub enum Kind
{
Texture,
ShaderProgram,
ImplementationSpecific,
}
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