Change bulk evaluation signature (#107)

Changed `BulkEvaluator::eval` signature to take x, y, z arguments as
`&[T]` instead of `&[f32]`. This is more flexible for gradient
evaluation, because it allows the caller to specify up to three
gradients, without pinning them to specific argument.

(this is a building block for eventually decoupling evaluation from
specifically requiring`(x, y, z)` arguments)

CHANGELOG.md

@@ -9,6 +9,10 @@
     - Change signature of `fidget::render::render2d` to pass the mode only as a
       generic parameter, instead of an argument
 - Add new operations: `floor`, `ceil`, `round`, `atan2`
+- Changed `BulkEvaluator::eval` signature to take x, y, z arguments as `&[T]`
+  instead of `&[f32]`.  This is more flexible for gradient evaluation, because
+  it allows the caller to specify up to three gradients, without pinning them to
+  specific argument.
 
 # 0.2.6
 This is a relatively small release; there are a few features to improve the

fidget/src/core/eval/bulk.rs

@@ -40,9 +40,9 @@ pub trait BulkEvaluator: Default {
     fn eval(
         &mut self,
         tape: &Self::Tape,
-        x: &[f32],
-        y: &[f32],
-        z: &[f32],
+        x: &[Self::Data],
+        y: &[Self::Data],
+        z: &[Self::Data],
     ) -> Result<&[Self::Data], Error>;
 
     /// Build a new empty evaluator