diff --git a/crates/spirv_backend/src/lib.rs b/crates/spirv_backend/src/lib.rs
index a092c40..774538f 100644
--- a/crates/spirv_backend/src/lib.rs
+++ b/crates/spirv_backend/src/lib.rs
@@ -16,6 +16,7 @@ mod adapt;
 mod support;
 
 use coremem_types::mat::{Ferroxcube3R1MH, FullyGenericMaterial, IsoConductorOr};
+use coremem_types::real::R32;
 use coremem_types::step::SimMeta;
 use coremem_types::vec::{Vec3, Vec3u};
 
@@ -79,5 +80,7 @@ macro_rules! steps {
     };
 }
 
-steps!(f32, FullyGenericMaterial<f32>, step_h_generic_material, step_e_generic_material);
-steps!(f32, Iso3R1<f32>, step_h_iso_3r1, step_e_iso_3r1);
+steps!(f32, FullyGenericMaterial<f32>, step_h_generic_material_f32, step_e_generic_material_f32);
+steps!(f32, Iso3R1<f32>, step_h_iso_3r1_f32, step_e_iso_3r1_f32);
+steps!(R32, FullyGenericMaterial<R32>, step_h_generic_material_r32, step_e_generic_material_r32);
+steps!(R32, Iso3R1<R32>, step_h_iso_3r1_r32, step_e_iso_3r1_r32);
diff --git a/crates/types/src/real.rs b/crates/types/src/real.rs
index 9d346a3..32d9168 100644
--- a/crates/types/src/real.rs
+++ b/crates/types/src/real.rs
@@ -292,7 +292,7 @@ impl<T: Real> Finite<T> {
     }
     #[cfg(not(feature = "fmt"))]
     fn handle_non_finite(_inner: T) -> ! {
-        panic!("Finite<T> is not finite");
+        panic!(); // expected a finite real
     }
 }
 
@@ -384,7 +384,6 @@ impl<T: ToFloat> ToFloat for Finite<T> {
 impl<T: RealFeatures> RealFeatures for Finite<T> {}
 
 impl<T: Real> Real for Finite<T> {
-    decl_consts!(Self::from_primitive);
     fn from_primitive<P: ToFloat>(p: P) -> Self {
         Self::new(T::from_primitive(p))
     }
@@ -422,6 +421,53 @@ impl<T: Real> Real for Finite<T> {
         let (s, c) = self.0.sin_cos();
         (Self::new(s), Self::new(c))
     }
+
+    // we would ideally use `decl_consts` here, but that produces f64 -> f32 casts for R32 code.
+    fn zero() -> Self {
+        Self::from_primitive(T::zero())
+    }
+    fn one() -> Self {
+        Self::from_primitive(T::one())
+    }
+    fn two() -> Self {
+        Self::from_primitive(T::two())
+    }
+    fn three() -> Self {
+        Self::from_primitive(T::three())
+    }
+    fn ten() -> Self {
+        Self::from_primitive(T::ten())
+    }
+    fn tenth() -> Self {
+        Self::from_primitive(T::tenth())
+    }
+    fn third() -> Self {
+        Self::from_primitive(T::third())
+    }
+    fn half() -> Self {
+        Self::from_primitive(T::half())
+    }
+    fn pi() -> Self {
+        Self::from_primitive(T::pi())
+    }
+    fn two_pi() -> Self {
+        Self::from_primitive(T::two_pi())
+    }
+    fn c() -> Self {
+        Self::from_primitive(T::c())
+    }
+    fn eps0() -> Self {
+        Self::from_primitive(T::eps0())
+    }
+    fn twice_eps0() -> Self {
+        Self::from_primitive(T::twice_eps0())
+    }
+    fn mu0() -> Self {
+        Self::from_primitive(T::mu0())
+    }
+    fn mu0_inv() -> Self {
+        Self::from_primitive(T::mu0_inv())
+    }
 }
 
 impl ToFloat for i32 {