sim: fold most accessors behind the meta method

crates/coremem/src/sim/mod.rs

@@ -1,6 +1,7 @@
 use crate::geom::{Coord, Cube, Index, InvertedRegion, Meters, Region};
 use crate::cross::mat::Vacuum;
 use crate::cross::real::Real;
+use crate::cross::step::SimMeta;
 use crate::cross::vec::{Vec3, Vec3u};
 use crate::stim::{AbstractStimulus, NoopStimulus};
 use rayon::prelude::*;
@@ -292,9 +293,18 @@ impl<'a> dyn SampleableSim + 'a {
 // TODO: the Send/Sync bounds here could be removed with some refactoring
 pub trait SampleableSim: Send + Sync {
     fn sample(&self, pos: Meters) -> Sample;
+    fn meta(&self) -> SimMeta<f32>;
+    fn step_no(&self) -> u64;
 
-    fn size(&self) -> Index;
-    fn feature_size(&self) -> f32;
+    /// Take a "snapshot" of the simulation, dropping all material-specific information.
+    fn to_static(&self) -> StaticSim;
+
+    fn size(&self) -> Index {
+        Index(self.meta().dim)
+    }
+    fn feature_size(&self) -> f32 {
+        self.meta().feature_size
+    }
     fn feature_volume(&self) -> f32 {
         let f = self.feature_size();
         f*f*f
@@ -303,9 +313,9 @@ pub trait SampleableSim: Send + Sync {
         let s = self.size().to_meters(self.feature_size());
         s.x() * s.y() * s.z()
     }
-    fn timestep(&self) -> f32;
-
-    fn step_no(&self) -> u64;
+    fn timestep(&self) -> f32 {
+        self.meta().time_step
+    }
 
     fn width(&self) -> u32 {
         self.size().x()
@@ -319,7 +329,4 @@ pub trait SampleableSim: Send + Sync {
     fn time(&self) -> f32 {
         self.timestep() * self.step_no() as f32
     }
-
-    /// Take a "snapshot" of the simulation, dropping all material-specific information.
-    fn to_static(&self) -> StaticSim;
 }