feat(const_eval): impl. ceil

CHANGELOG.md

@@ -66,6 +66,8 @@ Bottom level categories:
         - `step`
         - `tan`
         - `tanh`
+    - [#5098](https://github.com/gfx-rs/wgpu/pull/5098) by @ErichDonGubler:
+        - `ceil`
 - Eager release of GPU resources comes from device.trackers. By @bradwerth in [#5075](https://github.com/gfx-rs/wgpu/pull/5075)
 - `wgpu-types`'s `trace` and `replay` features have been replaced by the `serde` feature. By @KirmesBude in [#5149](https://github.com/gfx-rs/wgpu/pull/5149)
 - `wgpu-core`'s `serial-pass` feature has been removed. Use `serde` instead. By @KirmesBude in [#5149](https://github.com/gfx-rs/wgpu/pull/5149)

naga/src/proc/constant_evaluator.rs

@@ -842,6 +842,9 @@ impl<'a> ConstantEvaluator<'a> {
                     Ok([e1.powf(e2)])
                 })
             }
+            crate::MathFunction::Ceil => {
+                component_wise_float!(self, span, [arg], |e| { Ok([e.ceil()]) })
+            }
             crate::MathFunction::Clamp => {
                 component_wise_scalar!(
                     self,

naga/tests/out/glsl/variations.main.Fragment.glsl

@@ -8,9 +8,8 @@ uniform highp samplerCube _group_0_binding_0_fs;
 
 void main_1() {
     ivec2 sizeCube = ivec2(0);
-    float a = 0.0;
+    float a = 1.0;
     sizeCube = ivec2(uvec2(textureSize(_group_0_binding_0_fs, 0).xy));
-    a = ceil(1.0);
     return;
 }