texture freeing + render updates done a bit nicer

src/render/primitive.rs

@@ -5,10 +5,20 @@ use crate::{
 use bytemuck::Pod;
 use wgpu::*;
 
-#[derive(Default)]
 pub struct Primitives {
     pub(super) instances: Vec<PrimitiveInstance>,
     pub(super) data: PrimitiveData,
+    pub updated: bool,
+}
+
+impl Default for Primitives {
+    fn default() -> Self {
+        Self {
+            instances: Default::default(),
+            data: Default::default(),
+            updated: true,
+        }
+    }
 }
 
 pub trait Primitive: Pod {