feat(const_eval): impl. max

Author: ErichDonGubler

CHANGELOG.md

@@ -74,6 +74,7 @@ Bottom level categories:
         - `inverseSqrt`
         - `log`
         - `log2`
+        - `max`
         - `radians`
         - `reverseBits`
         - `sign`

naga/src/proc/constant_evaluator.rs

@@ -947,6 +947,11 @@ impl<'a> ConstantEvaluator<'a> {
             crate::MathFunction::Log2 => {
                 component_wise_float!(self, span, [arg], |e| { Ok([e.log2()]) })
             }
+            crate::MathFunction::Max => {
+                component_wise_scalar!(self, span, [arg, arg1.unwrap()], |e1, e2| {
+                    Ok([e1.max(e2)])
+                })
+            }
             crate::MathFunction::Pow => {
                 component_wise_float!(self, span, [arg, arg1.unwrap()], |e1, e2| {
                     Ok([e1.powf(e2)])