1 files changed, 137 insertions, 0 deletions
diff --git a/engine/src/rendering/object.rs b/engine/src/rendering/object.rs
new file mode 100644
index 0000000..61e7ed5
--- /dev/null
+++ b/engine/src/rendering/object.rs
@@ -0,0 +1,137 @@
+use std::collections::HashMap;
+use std::fmt::Display;
+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,
+        }
+    }
+}
+
+impl From<AssetId> for Id
+{
+    fn from(asset_id: AssetId) -> Self
+    {
+        Self::Asset(asset_id)
+    }
+}
+
+#[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 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, PartialEq, Eq)]
+#[non_exhaustive]
+pub enum Kind
+{
+    Texture,
+    ShaderProgram,
+    Mesh,
+    Framebuffer,
+}
+
+impl Display for Kind
+{
+    fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
+    {
+        formatter.write_str(match self {
+            Self::Texture => "texture",
+            Self::ShaderProgram => "shader program",
+            Self::Mesh => "mesh",
+            Self::Framebuffer => "framebuffer",
+        })
+    }
+}